US4536409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen scavenger
Assignee: Pechiney Plastic Packaging Inc
•
Filing: 1981-01-23
•
Granted: 1985-08-20
•
Expires: 2001-01-23
Abstract
Abstract This disclosure includes an activatable oxygen scavenger used as a part of a packaging structure for comestibles.
Inventors
- 👤 Christopher J. Farrell
- 👤 Boh C. Tsai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:17
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; A; A23; A23B; A23B2/00; A23B2/70; A23B2/704; A23B2/708; A23B2/712; A23B2/717; B32B27/14; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D81/00; B65D81/24; B65D81/26; B65D81/266; B65D81/267; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/726; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 145
Claim 1
Independent Claim
155 words
A polymeric laminate having only solid layers which comprises: a. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and b. a polymeric layer having incorporated therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective layer from outside the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 2
Dependent Claim
155 words
A polymeric laminate having only solid layers which comprises: a. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and b. a polymeric layer having incorporated therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective layer from outside the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 3
Dependent Claim
27 words
The laminate of claim 1 wherein a second polymeric protective layer is disposed on the side of said oxygen scavenger layer opposite to said first protective layer.
Claim 4
Dependent Claim
23 words
The laminate of claim 2 wherein a polymeric oxygen barrier layer is provided between said oxygen scavenger layer and said first protective layer.
Claim 5
Dependent Claim
16 words
The laminate of claim 2 wherein a second polymeric oxygen barrier layer is a protective layer.
Claim 6
Dependent Claim
42 words
The laminate of claim 3 wherein an outer polymeric protective layer is disposed on the free side of said oxygen scavenger layer and a second polymeric oxygen barrier layer is provided between said oxygen scavenger layer and said second polymeric protective layer.
Claim 7
Dependent Claim
152 words
A polymeric laminate having only solid layers comprised of: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to a dry oxygen scavenger material incorporated in said polymeric protective layer, said oxygen scavenger material, being capable of a passive state for prolonged periods of time in which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective polymeric layer from outside thereof, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 8
Dependent Claim
152 words
A polymeric laminate having only solid layers comprised of: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to a dry oxygen scavenger material incorporated in said polymeric protective layer, said oxygen scavenger material, being capable of a passive state for prolonged periods of time in which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective polymeric layer from outside thereof, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 9
Dependent Claim
25 words
The laminate of claim 6 wherein an outer polymeric layer is provided adjacent the oxygen barrier layer on the side opposite to said scavenger layer.
Claim 10
Dependent Claim
30 words
The laminate of claim 6 wherein a second polymeric oxygen barrier layer is disposed on the side of said oxygen scavenger layer, opposite to the first polymeric oxygen barrier layer.
Claim 11
Dependent Claim
173 words
A polymeric laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to a scavenger material incorporated in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 12
Dependent Claim
173 words
A polymeric laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to a scavenger material incorporated in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 13
Dependent Claim
192 words
A polymeric laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 14
Dependent Claim
192 words
A polymeric laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 15
Dependent Claim
38 words
The laminate of claim 10 wherein a first adhesive layer is provided between said oxygen scavenger layer and said oxygen barrier layer, and a second adhesive layer is provided between said oxygen barrier layer and said polymeric layer.
Claim 16
Dependent Claim
35 words
The laminate of claim 10 wherein said scavenger layer is a polymeric adhesive containing said dry oxygen scavenger composition and a second adhesive layer is provided between said barrier layer and said outer polymeric layer.
Claim 17
Dependent Claim
202 words
A polymeric laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. first and second polymeric layers, c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer and said second polymeric layer being between said oxygen barrier layer and said second protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore are selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 18
Dependent Claim
202 words
A polymeric laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. first and second polymeric layers, c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer and said second polymeric layer being between said oxygen barrier layer and said second protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore are selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 19
Dependent Claim
58 words
The laminate of claims 1, 9, 10 or 13 wherein said protective layer has enhanced transmission of water at elevated temperatures amd becomes substantially resistant to permeation by water when cooled, so that the water which has permeated does not exit the laminate through said cooled protective layer, so that the scavenger material remains activated to absorb oxygen.
Claim 20
Dependent Claim
34 words
The laminate of claims 1, 6, 9, 10 or 13 wherein said oxygen scavenger material is an alkali and a gelatin and that said gelatin has been heat treated with or without said alkali.
Claim 21
Dependent Claim
27 words
The laminate of claim 15 wherein said heat treatment consists of raising the temperature of said gelatin to greater than 300° F. for more than 5 minutes.
Claim 22
Dependent Claim
29 words
The laminate of claim 15 wherein said heat treatment consists of raising the temperature of said oxygen scavenger material to greater than 300° F. for more than 5 minutes.
Claim 23
Dependent Claim
11 words
The laminate of claim 15 wherein said alkali is sodium hydroxide.
Claim 24
Dependent Claim
28 words
The laminate of claims 1, 6, 9, 10 or 13 wherein the oxygen scavenger material is adapted to be triggered by water at an elevated temperature during retorting.
Claim 25
Dependent Claim
20 words
The laminate of claims 1, 6, 9, 10 or 13 wherein the dry oxygen scavenger material is a singular material.
Claim 26
Dependent Claim
33 words
The laminate of claims 1, 6, 9, 10 or 13 wherein the oxygen scavenger material is incapable of self-generating water and is triggerable without the action of any other material in the laminate.
Claim 27
Dependent Claim
19 words
The laminate of claims 1, 6, 9, 10 or 13 wherein said oxygen scavenger material is a sulfite salt.
Claim 28
Dependent Claim
11 words
The laminate of claim 22 wherein said salt is potassium sulfite.
Claim 29
Dependent Claim
24 words
The laminate of claims 1, 6, 9, 10 or 13 wherein there is a plurality of said protective layers overlying said oxygen scavenger layer.
Claim 30
Dependent Claim
16 words
The laminate of claims 1, 9, 10 or 13 wherein said polymeric protective layer is olefinic.
Claim 31
Dependent Claim
17 words
The laminate of claim 25 wherein said olefinic material is a melt blend of polyethylene and polypropylene.
Claim 32
Dependent Claim
15 words
The laminate of claim 26 wherein said polyethylene and polypropylene are in substantially equal proportions.
Claim 33
Dependent Claim
20 words
The laminate of claims 6, 9, 10 or 13 wherein said oxygen barrier layer is an ethylene vinyl alcohol co-polymer.
Claim 34
Dependent Claim
40 words
The laminate of claims 6, 9, 10 or 13 wherein said layers are laminated and the oxygen scavenger material is within a melt processible polymeric layer which is in contact with said oxygen barrier layer and said polymeric protective layer.
Claim 35
Dependent Claim
10 words
The laminate of claim 29 wherein said layers are co-extruded.
Claim 36
Dependent Claim
10 words
The laminate of claim 29 wherein said layers are co-injected.
Claim 37
Dependent Claim
10 words
The laminate of claim 29 wherein said layers are thermoformed.
Claim 38
Dependent Claim
13 words
The laminate of claim 29 wherein said melt processible polymeric layer is olefinic.
Claim 39
Dependent Claim
160 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers which comprises: a. at least one polymeric protective layer in protective relation to an oxygen scavenger layer, and b. a polymeric layer having incorporated therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective layer from outside the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 40
Dependent Claim
160 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers which comprises: a. at least one polymeric protective layer in protective relation to an oxygen scavenger layer, and b. a polymeric layer having incorporated therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective layer from outside the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 41
Dependent Claim
27 words
The container of claim 34 wherein a second polymeric protective layer is disposed on the side of said oxygen scavenger layer opposite to said first protective layer.
Claim 42
Dependent Claim
23 words
The container of claim 35 wherein a polymeric oxygen barrier layer is provided between said oxygen scavenger layer and said first protective layer.
Claim 43
Dependent Claim
16 words
The container of claim 35 wherein a second polymeric oxygen barrier layer is a protective layer.
Claim 44
Dependent Claim
42 words
The container of claim 36 wherein an outer polymeric protective layer is disposed on the free side of said oxygen scavenger layer and a second polymeric oxygen barrier layer is provided between said oxygen scavenger layer and said second polymeric protective layer.
Claim 45
Dependent Claim
163 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers comprised of: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to a dry oxygen scavenger material incorporated in said polymeric protective layer, said oxygen scavenger material, being capable of a passive state for prolonged periods of time in which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective polymeric layer from outside thereof, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 46
Dependent Claim
163 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers comprised of: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to a dry oxygen scavenger material incorporated in said polymeric protective layer, said oxygen scavenger material, being capable of a passive state for prolonged periods of time in which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective polymeric layer from outside thereof, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 47
Dependent Claim
25 words
The container of claim 39 wherein an outer polymeric layer is provided adjacent the oxygen barrier layer on the side opposite to said scavenger layer.
Claim 48
Dependent Claim
30 words
The container of claim 39 wherein a second polymeric oxygen barrier layer is disposed on the side of said oxygen scavenger layer, opposite to the first polymeric oxygen barrier layer.
Claim 49
Dependent Claim
184 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to a scavenger material incorporated in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 50
Dependent Claim
184 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to a scavenger material incorporated in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 51
Dependent Claim
203 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger composition to convert it from the passive to the active state.
Claim 52
Dependent Claim
203 words
A multilayer polymeric container which includes a wall which is a laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger composition to convert it from the passive to the active state.
Claim 53
Dependent Claim
38 words
The container of claim 43 wherein a first adhesive layer is provided between said oxygen scavenger layer and said oxygen barrier layer, and a second adhesive layer is provided between said oxygen barrier layer and said polymeric layer.
Claim 54
Dependent Claim
35 words
The container of claim 43 wherein said scavenger layer is a polymeric adhesive containing said dry oxygen scavenger composition and a second adhesive layer is provided between said barrier layer and said outer polymeric layer.
Claim 55
Dependent Claim
214 words
A multilayer polymeric container which comprises a wall which is a laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. first and second polymeric layers, c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer and said second polymeric layer being located between said oxygen barrier layer and said second protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore are selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger composition to convert it from the passive to the active state.
Claim 56
Dependent Claim
214 words
A multilayer polymeric container which comprises a wall which is a laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. first and second polymeric layers, c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer and said second polymeric layer being located between said oxygen barrier layer and said second protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore are selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger composition to convert it from the passive to the active state.
Claim 57
Dependent Claim
58 words
The container of claims 34, 42, 43 or 46 wherein said protective layer has enhanced transmission of water at elevated temperatures and becomes substantially resistant to permeation by water when cooled, so that the water which has permeated does not exit the laminate through said cooled protective layer, so that the scavenger material remains activated to absorb oxygen.
Claim 58
Dependent Claim
34 words
The container of claims 34, 39, 42, 43 or 46 wherein said oxygen scavenger material is an alkali and a gelatin and that said gelatin has been heat treated with or without said alkali.
Claim 59
Dependent Claim
27 words
The container of claim 48 wherein said heat treatment consists of raising the temperature of said gelatin to greater than 300° F. for more than 5 minutes.
Claim 60
Dependent Claim
29 words
The container of claim 48 wherein said heat treatment consists of raising the temperature of said oxygen scavenger material to greater than 300° F. for more than 5 minutes.
Claim 61
Dependent Claim
11 words
The container of claim 48 wherein said alkali is sodium hydroxide.
Claim 62
Dependent Claim
28 words
The container of claims 34, 48, 42, 43 or 46 wherein the oxygen scavenger material is adapted to be triggered by water at an elevated temperature during retorting.
Claim 63
Dependent Claim
20 words
The container of claims 34, 48, 42, 43 or 46 wherein the dry oxygen scavenger material is a singular material.
Claim 64
Dependent Claim
33 words
The container of claims 34, 39, 42, 43 or 46 wherein the oxygen scavenger material is incapable of self-generating water and is triggerable without the action of any other material in the laminate.
Claim 65
Dependent Claim
19 words
The container of claims 34, 39, 42, 43 or 46 wherein said oxygen scavenger material is a sulfite salt.
Claim 66
Dependent Claim
11 words
The container of claim 55 wherein said salt is potassium sulfite.
Claim 67
Dependent Claim
24 words
The container of claims 34, 39, 42, 43 or 46 wherein there is a plurality of said protective layers overlying said oxygen scavenger layer.
Claim 68
Dependent Claim
16 words
The container of claims 34, 42, 43 or 46 wherein said polymeric protective layer is olefinic.
Claim 69
Dependent Claim
17 words
The container of claim 58 wherein said olefinic material is a melt blend of polyethylene and polypropylene.
Claim 70
Dependent Claim
15 words
The container of claim 59 wherein said polyethylene and polypropylene are in substantially equal proportions.
Claim 71
Dependent Claim
20 words
The container of claims 39, 42, 43 or 46 wherein said oxygen barrier layer is an ethylene vinyl alcohol co-polymer.
Claim 72
Dependent Claim
40 words
The container of claims 39, 42, 43 or 46 wherein said layers are laminated and the oxygen scavenger material is within a melt processible polymeric layer which is in contact with said oxygen barrier layer and said polymeric protective layer.
Claim 73
Dependent Claim
10 words
The container of claim 62 wherein said layers are co-extruded.
Claim 74
Dependent Claim
10 words
The container of claim 62 wherein said layers are co-injected.
Claim 75
Dependent Claim
10 words
The container of claim 62 wherein said layers are thermoformed.
Claim 76
Dependent Claim
12 words
The container of claim 62 wherein said melt-processable polymeric layer is olefinic.
Claim 77
Independent Claim
168 words
A method of producing a multilayer polymeric laminate which comprises forming a polymeric laminate, the laminate having only solid layers which comprises: a. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and b. a polymeric layer having incorporated therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective layer from outside the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 78
Independent Claim
168 words
A method of producing a multilayer polymeric laminate which comprises forming a polymeric laminate, the laminate having only solid layers which comprises: a. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and b. a polymeric layer having incorporated therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective layer from outside the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 79
Dependent Claim
27 words
The method of claim 67 wherein a second polymeric protective layer is disposed on the side of said oxygen scavenger layer opposite to said first protective layer.
Claim 80
Dependent Claim
23 words
The method of claim 68 wherein a polymeric oxygen barrier layer is provided between said oxygen scavenger layer and said first protective layer.
Claim 81
Independent Claim
165 words
A method of producing a multilayer polymeric laminate which comprises forming a polymeric laminate, the laminate having only solid layers comprised of: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to a dry oxygen scavenger material incorporated in said polymeric protective layer, said oxygen scavenger material, being capable of a passive state for prolonged periods of time in which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective polymeric layer from outside thereof, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 82
Independent Claim
165 words
A method of producing a multilayer polymeric laminate which comprises forming a polymeric laminate, the laminate having only solid layers comprised of: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to a dry oxygen scavenger material incorporated in said polymeric protective layer, said oxygen scavenger material, being capable of a passive state for prolonged periods of time in which the oxygen scavenger will not directly react with oxygen, and triggerable to an active state when wetted with water which has selectively permeated the protective polymeric layer from outside thereof, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 83
Dependent Claim
25 words
The method of claim 70 wherein an outer polymeric layer is provided adjacent the oxygen barrier layer on the side opposite to said scavenger layer.
Claim 84
Independent Claim
187 words
A method of producing a multilayer polymeric laminate which comprises forming a multilayer polymeric laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to a scavenger material incorpoated in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 85
Independent Claim
187 words
A method of producing a multilayer polymeric laminate which comprises forming a multilayer polymeric laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to a scavenger material incorpoated in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger composition, the composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 86
Independent Claim
206 words
A method of producing a multilayer polymeric laminate which comprises forming a solid polymeric laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures, and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 87
Independent Claim
206 words
A method of producing a multilayer polymeric laminate which comprises forming a solid polymeric laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, c. a polymeric layer between said oxygen barrier layer and said protective layer and having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, d. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures, and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 88
Dependent Claim
38 words
The method of claim 73 wherein a first adhesive layer is provided between said oxygen scavenger layer and said oxygen barrier layer, and a second adhesive layer is provided between said oxygen barrier layer and said polymeric layer.
Claim 89
Dependent Claim
35 words
The method of claim 73 wherein said scavenger layer is a polymeric adhesive containing said dry oxygen scavenger composition and a second adhesive layer is provided between said barrier layer and said outer polymeric layer.
Claim 90
Independent Claim
217 words
A method of producing a multilayer polymeric laminate which comprises forming a polymeric laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. first and second polymeric layers, c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer, and said second polymeric layer being located between said oxygen barrier layer and said second polymeric protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 91
Independent Claim
217 words
A method of producing a multilayer polymeric laminate which comprises forming a polymeric laminate, the laminate having only solid layers which comprises: a. a polymeric oxygen barrier layer, b. first and second polymeric layers, c. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, said first polymeric layer being located between said oxygen barrier layer and said first protective layer, and said second polymeric layer being located between said oxygen barrier layer and said second polymeric protective layer, said first and second polymeric layers having therein a dry oxygen scavenger material, the material being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated the protective layer from outside of the laminate, whereupon the oxygen scavenger will directly react with oxygen, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state.
Claim 92
Independent Claim
58 words
The method of claims 67, 72, 73 or 76 wherein said protective layer has enhanced transmission of water at elevated temperatures and becomes substantially resistant to permeation by water when cooled so that the water which has permeated does not exit the laminate through said cooled protective layer, so that the scavenger material remains activated to absorb oxygen.
Claim 93
Independent Claim
34 words
The method of claims 67, 70, 72, 73 or 76 wherein said oxygen scavenger material is an alkali and a gelatin and that said gelatin has been heat treated with or without said alkali.
Claim 94
Dependent Claim
27 words
The method of claim 78 wherein said heat treatment consists of raising the temperature of said gelatin to greater than 300° F. for more than 5 minutes.
Claim 95
Dependent Claim
29 words
The method of claim 78 wherein said heat treatment consists of raising the temperature of said oxygen scavenger material to greater than 300° F. for more than 5 minutes.
Claim 96
Dependent Claim
11 words
The method of claim 78 wherein said alkali is sodium hydroxide.
Claim 97
Independent Claim
28 words
The method of claims 67, 70, 72, 73 or 76 wherein the oxygen scavenger material is adapted to be triggered by water at an elevated temperature during retorting.
Claim 98
Independent Claim
19 words
The method of claims 67, 70,72, 73 or 76 wherein the dry oxygen scavenger material is a singular material.
Claim 99
Dependent Claim
33 words
The laminate of claims 67, 70, 72, 73 or 76 wherein the oxygen scavenger material is incapable of self-generating water and is triggerable without the action of any other material in the laminate.
Claim 100
Independent Claim
19 words
The method of claims 67, 70, 72, 73 or 76 wherein said oxygen scavenger material is a sulfite salt.
Claim 101
Dependent Claim
11 words
The method of claim 85 wherein said salt is potassium sulfite.
Claim 102
Independent Claim
24 words
The method of claims 67, 70, 72, 73 or 76 wherein there is a plurality of said protective layers overlying said oxygen scavenger layer.
Claim 103
Independent Claim
16 words
The method of claims 67, 72, 73 or 76 wherein said polymeric protective layer is olefinic.
Claim 104
Dependent Claim
17 words
The method of claim 88 wherein said olefinic material is a melt blend of polyethylene and polypropylene.
Claim 105
Dependent Claim
15 words
The method of claim 89 wherein said polyethylene and polypropylene are in substantially equal proportions.
Claim 106
Independent Claim
20 words
The method of claims 70, 72, 73 or 76 wherein said oxygen barrier layer is an ethylene vinyl alcohol co-polymer.
Claim 107
Independent Claim
40 words
The method of claims 70, 72, 73 or 76 wherein said layers are laminated and the oxygen scavenger material is within a melt processible polymeric layer which is in contact with said oxygen barrier layer and said polymeric protective layer.
Claim 108
Dependent Claim
10 words
The method of claim 92 wherein said layers are co-extruded.
Claim 109
Dependent Claim
10 words
The method of claim 92 wherein said layers are co-injected.
Claim 110
Dependent Claim
10 words
The method of claim 92 wherein said layers are thermoformed.
Claim 111
Dependent Claim
13 words
The method of claim 92 wherein said melt processible polymeric layer is olefinic.
Claim 112
Independent Claim
234 words
A method of producing a triggered solid polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and ii. a polymeric layer of said thermoplastic mixture having incorporated therein said dry oxygen scavenger material, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 113
Independent Claim
234 words
A method of producing a triggered solid polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, and ii. a polymeric layer of said thermoplastic mixture having incorporated therein said dry oxygen scavenger material, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 114
Independent Claim
27 words
The method of claims 97, wherein a second polymeric protective layer is disposed on the side of said oxygen scavenger layer opposite to said first protective layer.
Claim 115
Dependent Claim
23 words
The method of claim 98 wherein a polymeric oxygen barrier layer is provided between said oxygen scavenger layer and said first protective layer.
Claim 116
Independent Claim
224 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to said dry oxygen scavenger composition incorporated in said polymeric protective layer, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water, and e. retorting the container therby to activate the oxygen scavenger material into its active state.
Claim 117
Independent Claim
224 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: a polymeric oxygen barrier layer, and, adhered thereto, at least one polymeric protective layer in protective relation to said dry oxygen scavenger composition incorporated in said polymeric protective layer, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water, and e. retorting the container therby to activate the oxygen scavenger material into its active state.
Claim 118
Dependent Claim
25 words
The method of claim 100 wherein an outer polymeric layer is provided adjacent the oxygen barrier layer on the side opposite to said scavenger layer.
Claim 119
Independent Claim
248 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. a polymeric oxygen barrier layer, ii. at least one polymeric protective layer in protective relation to an oxygen scavenger material incorporated in another layer of the laminate, iii. a polymeric layer of said thermoplastic mixture between said oxygen barrier layer and said protective layer and having therein said dry oxygen scavenger material, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 120
Independent Claim
248 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. a polymeric oxygen barrier layer, ii. at least one polymeric protective layer in protective relation to an oxygen scavenger material incorporated in another layer of the laminate, iii. a polymeric layer of said thermoplastic mixture between said oxygen barrier layer and said protective layer and having therein said dry oxygen scavenger material, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 121
Independent Claim
266 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. a polymeric oxygen barrier layer, ii. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, iii. a polymeric layer of said thermoplastic mixture between said oxygen barrier layer and said protective layer and having therein said dry oxygen scavenger material, iv. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 122
Independent Claim
266 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. a polymeric oxygen barrier layer, ii. at least one polymeric protective layer in protective relation to an oxygen scavenger material in another layer of the laminate, iii. a polymeric layer of said thermoplastic mixture between said oxygen barrier layer and said protective layer and having therein said dry oxygen scavenger material, iv. an outer polymeric protective layer adjacent the oxygen barrier layer on the side opposite to said scavenger layer wherein said protective layers are substantially resistant to permeation by water at ambient temperature and have enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 123
Dependent Claim
38 words
The method of claim 103 wherein a first adhesive layer is provided between said oxygen scavenger layer and said oxygen barrier layer, and a second adhesive layer is provided between said oxygen barrier layer and said polymeric layer.
Claim 124
Dependent Claim
35 words
The method of claim 103 wherein said scavenger layer is a polymeric adhesive containing said dry oxygen scavenger composition and a second adhesive layer is provided between said barrier layer and said outer polymeric layer.
Claim 125
Independent Claim
281 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. a polymeric oxygen barrier layer, ii. first and second polymeric layers, iii. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, a first polymeric layer of said thermoplastic mixture being located between said oxygen barrier layer and said first protective layer, and a second polymeric layer of said thermoplastic mixture being located between said oxygen barrier layer said second polymeric protective layer, said first and second polymeric layers having therein said dry oxygen scavenger material, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 126
Independent Claim
281 words
A method of producing a triggered polymeric multilayer food container having only solid layers which comprises: a. mixing a polymeric material with a dry oxygen scavenger composition to form a thermoplastic mixture, said oxygen scavenger composition being capable of a passive state for prolonged periods of time during which the oxygen scavenger will not directly react with oxygen, and adapted to be triggered to an active state when wetted with water which has selectively permeated a protective layer from outside of the laminate whereupon it will directly react with oxygen, b. forming a multilayer polymeric laminate containing: i. a polymeric oxygen barrier layer, ii. first and second polymeric layers, iii. at least one first and second polymeric protective layers in protective relationship to said first and second polymeric layers, a first polymeric layer of said thermoplastic mixture being located between said oxygen barrier layer and said first protective layer, and a second polymeric layer of said thermoplastic mixture being located between said oxygen barrier layer said second polymeric protective layer, said first and second polymeric layers having therein said dry oxygen scavenger material, wherein said protective layer is substantially resistant to permeation by water at ambient temperature and has enhanced transmission of water at elevated temperatures and therefore is selectively capable of permeation by water at an elevated temperature to thereby selectively permit the water to contact said oxygen scavenger material to convert it from the passive to the active state, c. forming the laminate into a container and maintaining the container in its dry state, d. filling the container with a comestible containing water and e. retorting the container thereby to activate the oxygen scavenger material into its active state.
Claim 127
Independent Claim
58 words
The method of claims 97, 102, 103 or 106 wherein said protective layer has enhanced transmission of water at elevated temperatures and becomes substantially resistant to permeation by water when cooled, so that the water which has permeated does not exit the laminate through said cooled protective layer, so that the scavenger material remains activated to absorb oxygen.
Claim 128
Independent Claim
34 words
The method of claims 97, 100, 102, 103 or 106 wherein said oxygen scavenger material is an alkali and a gelatin and that said gelatin has been heat treated with or without said alkali.
Claim 129
Dependent Claim
27 words
The method of claim 108 wherein said heat treatment consists of raising the temperature of said gelatin to greater than 300° F. for more than 5 minutes.
Claim 130
Dependent Claim
29 words
The method of claim 108 wherein said heat treatment consists of raising the temperature of said oxygen scavenger material to greater than 300° F. for more than 5 minutes.
Claim 131
Dependent Claim
11 words
The method of claim 108 wherein said alkali is sodium hydroxide.
Claim 132
Independent Claim
28 words
The method of claims 97, 100, 102, 103 or 106 wherein the oxygen scavenger material is adapted to be triggered by water at an elevated temperature during retorting.
Claim 133
Independent Claim
20 words
The method of claims 97, 100, 102, 103 or 106 wherein the dry oxygen scavenger material is a singular material.
Claim 134
Independent Claim
33 words
The method of claims 97, 100, 102, 103 or 106 wherein the oxygen scavenger material is incapable of self-generating water and is triggerable without the action of any other material in the laminate.
Claim 135
Independent Claim
19 words
The method of claims 97, 100, 102, 103 or 106 wherein said oxygen scavenger material is a sulfite salt.
Claim 136
Dependent Claim
11 words
The method of claim 115, wherein said salt is potassium sulfite.
Claim 137
Independent Claim
24 words
The method of claims 97, 100, 102, 103 or 106 wherein there is a plurality of said protective layers overlying said oxygen scavenger layer.
Claim 138
Independent Claim
16 words
The method of claims 97, 102, 103 or 106 wherein said polymeric protective layer is olefinic.
Claim 139
Dependent Claim
17 words
The method of claim 118 wherein said olefinic material is a melt blend of polyethylene and polypropylene.
Claim 140
Dependent Claim
15 words
The method of claim 119 wherein said polyethylene and polypropylene are in substantially equal proportions.
Claim 141
Independent Claim
20 words
The method of claims 100, 102, 103 or 106 wherein said oxygen barrier layer is an ethylene vinyl alcohol co-polymer.
Claim 142
Independent Claim
42 words
The method of claims 100, 102, 103 or 106 wherein said layers are formed by laminating and the oxygen scavenger material is within a melt processible polymeric layer which is in contact with said oxygen barrier layer and said polymeric protective layer.
Claim 143
Dependent Claim
10 words
The method of claim 122 wherein said layers are co-extruded.
Claim 144
Dependent Claim
10 words
The method of claim 122 wherein said layers are co-injected.
Claim 145
Dependent Claim
10 words
The method of claim 122 wherein said layers are thermoformed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |