US4243074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular packaging material, preferably for use as a sausage casing
Assignee: Hoechst AG
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Filing: 1978-05-26
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Granted: 1981-01-06
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Expires: 1998-05-26
Abstract
Abstract Disclosed is a multi-layer tubular packaging material having two or more layers, comprising at least one first layer of a polymer comprising a linear polyamide and at least one second layer of a polymer comprising a linear polyamide containing from about 2 to 40 percent by weight of a hydrophilic substance compatible with the polyamide, e.g., polyvinyl alcohol.
Inventors
- 👤 Hans Strutzel
- 👤 Klaus Hoheisel
- 👤 Siegfried Janocha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; A; A22; A22C; A22C13/00; A22C13/0013; B32B27/30; B32B27/306; B32B27/32; B32B27/34; A22C2013/002; A22C2013/0053; A22C2013/0063; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2323/00; B32B2323/04; B32B2323/046; B32B2331/00; B32B2331/04; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1324; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31732
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
82 words
A multi-layer tubular packaging material having two or more layers, comprising a tubular packaging arrangement comprised of a packaging material comprising at least one first layer of a polymer comprising a linear polyamide and, bonded to the outer surface of said first layer, at least one second layer of a polymer comprising a major proportion of a linear polyamide containing from about 2 to 40 percent by weight of a hydrophilic substance compatible with the polyamide, said hydrophilic substance comprising polyvinyl alcohol.
Claim 2
Dependent Claim
82 words
A multi-layer tubular packaging material having two or more layers, comprising a tubular packaging arrangement comprised of a packaging material comprising at least one first layer of a polymer comprising a linear polyamide and, bonded to the outer surface of said first layer, at least one second layer of a polymer comprising a major proportion of a linear polyamide containing from about 2 to 40 percent by weight of a hydrophilic substance compatible with the polyamide, said hydrophilic substance comprising polyvinyl alcohol.
Claim 3
Dependent Claim
27 words
A packaging material according to claim 1, wherein the polyvinyl alcohol is comprised of a partially saponified form including less than 15 percent of unsaponified ester groups.
Claim 4
Dependent Claim
26 words
A packaging material according to claim 1, the polyamide containing the hydrophilic substance comprises a polyamide having from 4 to 6 carbon atoms in each unit.
Claim 5
Dependent Claim
17 words
A packaging material according to claim 3, wherein the polyamide containing the hydrophilic substance comprises polyamide 6.
Claim 6
Dependent Claim
30 words
A packaging material according to claim 1, having a permeability to oxygen of less than about 25 cm 3 /m 2 .d. bar, at a calculated thickness of 40 μm.
Claim 7
Dependent Claim
29 words
A packaging material according to Claim 1, having a permeability to water vapor of less than about 25 g/m 2 .d. bar, at a calculated thickness of 40 μm.
Claim 8
Dependent Claim
24 words
A packaging material according to claim 1, wherein the first polyamide layer comprises a polyamide having 9 to 12 carbon atoms in each unit.
Claim 9
Dependent Claim
22 words
A packaging material according to claim 7, wherein the polyamide of said first layer is comprised of polyamide 11 or polyamide 12.
Claim 10
Dependent Claim
20 words
A packaging material according to claim 1, wherein the first polyamide layer comprises a polymer blend of polyamide and polyethylene.
Claim 11
Dependent Claim
16 words
A packaging material according to claim 9, wherein said polymer blend comprises polyamide 6 and polyethylene.
Claim 12
Dependent Claim
18 words
A packaging material according to claim 10, wherein said polymer blend comprises polyamide 6 and a low-density polyethylene.
Claim 13
Dependent Claim
21 words
The packaging material according to claim 9, wherein the first polyamide layer comprises a polymer blend of two polyamides and polyethylene.
Claim 14
Dependent Claim
20 words
The packaging material according to claim 12, wherein said two polyamides in said blend comprise polyamide 6 and polyamide 6,6.
Claim 15
Dependent Claim
20 words
The packaging material according to claim 12, wherein said two polyamides in said blend comprise polyamide 6 and polyamide 12.
Claim 16
Dependent Claim
33 words
A packaging material according to claim 9, wherein said polymer blend comprises from about 25 to 75 percent by weight of polyamide and from about 75 to 25 percent by weight of polyethylene.
Claim 17
Dependent Claim
33 words
A packaging material according to claim 15, wherein said polymer blend comprises from about 40 to 60 percent by weight of polyamide and from about 60 to 40 percent by weight of polyethylene.
Claim 18
Dependent Claim
20 words
The packaging material according to claim 1, wherein the first polyamide layer comprises a polymer blend of polyamide and polypropylene.
Claim 19
Dependent Claim
37 words
A packaging material according to claim 1, comprising at least one additional third layer of a thermoplastic polymer containing no polyamide, wherein said third layer forms the inner most layer and is comprised of a heat-sealable material.
Claim 20
Dependent Claim
17 words
A packaging material according to claim 1, wherein said material is oriented in at least one direction.
Claim 21
Dependent Claim
13 words
A packaging material according to claim 1, wherein said material is heat set.
Claim 22
Dependent Claim
14 words
A packaging material according to claim 1, in the form of a sausage casing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |