US4169910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer film including polyolefin layers and a polybutylene layer useful for the production of bags
Assignee: Glad Products Co
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Filing: 1978-06-28
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Granted: 1979-10-02
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Expires: 1998-06-28
Abstract
Abstract A multilayer film suitable for use in fabricating a trash bag, includes a first outer layer comprising a first heat sealable polyolefin, a second outer layer comprising a second heat sealable polyolefin, and a core layer comprising a blend of a polybutylene homopolymer, and a polypropylene homopolymer or copolymer.
Inventors
- 👤 James J. Graboski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B1/00; B32B27/30; B32B27/306; B32B27/32; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B32B2270/00; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/72; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/10; B32B2331/00; B32B2331/04; B32B2333/00; B32B2333/04; B32B2439/00; B32B2439/02; B32B2439/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
80 words
A multilayer film suitable for use in fabricating a trash bag, includes a first outer layer comprising a first extruded heat sealable polyolefin; a second outer layer comprising a second heat extruded sealable polyolefin; and an extruded core layer comprising a blend of a polybutylene homopolymer having a melt flow of from about 0.4 to about 10.0 decigrams per minute, and a polypropylene homopolymer or copolymer having a melt flow of from about 0.5 to about 15.0 decigrams per minute.
Claim 2
Dependent Claim
80 words
A multilayer film suitable for use in fabricating a trash bag, includes a first outer layer comprising a first extruded heat sealable polyolefin; a second outer layer comprising a second heat extruded sealable polyolefin; and an extruded core layer comprising a blend of a polybutylene homopolymer having a melt flow of from about 0.4 to about 10.0 decigrams per minute, and a polypropylene homopolymer or copolymer having a melt flow of from about 0.5 to about 15.0 decigrams per minute.
Claim 3
Dependent Claim
40 words
The multilayer film of claim 1, wherein at least one of said polyolefins comprises polyethylene having a density of from 0.916 to 0.962 gram per cubic centimeter and having a melt flow of from 0.1 to 10.0 decigrams per minute.
Claim 4
Dependent Claim
33 words
The multilayer film of claim 2, wherein said polyethylene has a density of from 0.916 to 0.930 gram per cubic centimeter and a melt flow of from 0.1 to 6.0 decigrams per minute.
Claim 5
Dependent Claim
55 words
The multilayer film of claim 1, wherein at least one of said polyolefins comprises a copolymer of ethylene ethyl acrylate or ethylene vinyl acetate, said one polyolefin having a comonomer content of from about 1% to about 30% by weight and having a melt flow of from about 0.3 to about 10.0 decigrams per minute.
Claim 6
Dependent Claim
37 words
The multilayer film of claim 4, wherein said one polyolefin has a comonomer content of from about 1% to about 20% by weight and a melt flow of from about 0.3 to about 5.0 decigrams per minute.
Claim 7
Dependent Claim
26 words
The multilayer film of claim 1, wherein said polypropylene homopolymer or copolymer has a density of from about 0.89 to about 0.91 gram per cubic centimeter.
Claim 8
Dependent Claim
24 words
The multilayer film of claim 1, wherein said polybutylene homopolymer has a density of from about 0.90 to about 0.92 gram per cubic centimeter.
Claim 9
Dependent Claim
37 words
The multilayer film of claim 1, wherein said blend comprises from about 10% to about 90% by weight of said polybutylene homopolymer and from about 90% to about 10% by weight of said polypropylene homopolymer or copolymer.
Claim 10
Dependent Claim
27 words
The multilayer film of claim 1, wherein the weight ratio of said polybutylene homopolymer to said polypropylene homopolymer or copolymer is from about 1:2 to about 2:1.
Claim 11
Dependent Claim
13 words
The multilayer film of claim 9, wherein the weight ratio is about 1:1.
Claim 12
Dependent Claim
20 words
The multilayer film of claim 1, wherein the thickness of said film is from about 0.5 to about 10 mils.
Claim 13
Dependent Claim
16 words
The multilayer film of claim 11, wherein the thickness of said film is about 1.5 mils.
Claim 14
Dependent Claim
16 words
The multilayer film of claim 1, wherein the thickness of said film is about 3.0 mils.
Claim 15
Dependent Claim
21 words
A multilayer film of claim 1, consisting essentially of said first outer layer, said second outer layer, and said core layer.
Claim 16
Dependent Claim
10 words
A bag fabricated from the multilayer film of claim 1.
Claim 17
Independent Claim
76 words
A method for producing a multilayer film, comprising the steps of supplying to three separate extruders respectively first and second heat sealable polyolefins, and a blend of polybutylene homopolymer, and a polypropylene homopolymer or copolymer with each extruder feeding a separate channel of a multilayer die and extruding through a single die gap a multilayer film including first and second outer layers of said first and second polyolefins, respectively, and a core layer including said blend.
Claim 18
Independent Claim
76 words
A method for producing a multilayer film, comprising the steps of supplying to three separate extruders respectively first and second heat sealable polyolefins, and a blend of polybutylene homopolymer, and a polypropylene homopolymer or copolymer with each extruder feeding a separate channel of a multilayer die and extruding through a single die gap a multilayer film including first and second outer layers of said first and second polyolefins, respectively, and a core layer including said blend.
Claim 19
Dependent Claim
39 words
The method of claim 16, wherein at least one of said polyolefins comprises polyethylene having a density of from 0.916 to 0.962 gram per cubic centimeter and having a melt flow of from 0.1 to 10.0 decigrams per minute.
Claim 20
Dependent Claim
32 words
The method of claim 17, wherein said polyethylene has a density of from 0.916 to 0.930 gram per cubic centimeter and a melt flow of from 0.1 to 6.0 decigrams per minute.
Claim 21
Dependent Claim
53 words
The method of claim 16, wherein at least one of said polyolefins comprises a copolymer of ethylene ethyl acrylate or ethylene vinyl acetate, said copolymer having a comonomer content of from about 1% to about 30% by weight and having a melt flow of from about 0.3 to about 10.0 decigrams per minute.
Claim 22
Dependent Claim
35 words
The method of claim 19, wherein said copolymer has a comonomer content of from about 1% to about 20% by weight and a melt flow of from about 0.3 to about 5.0 decigrams per minute.
Claim 23
Dependent Claim
39 words
The method of claim 16, wherein said polypropylene homopolymer or copolymer has a density of from about 0.89 to about 0.91 gram per cubic centimeter and a melt flow of from about 0.5 to about 15.0 decigrams per minute.
Claim 24
Dependent Claim
37 words
The method of claim 16, wherein said polybutylene homopolymer has a density of from about 0.90 to about 0.92 gram per cubic centimeter and a melt flow of from about 0.4 to about 10.0 decigrams per minute.
Claim 25
Dependent Claim
36 words
The method of claim 16, wherein said blend comprises from about 10% to about 90% by weight of said polybutylene homopolymer and from about 90% to about 10% by weight of said polypropylene homopolymer or copolymer.
Claim 26
Dependent Claim
26 words
The method of claim 16, wherein the weight ratio of said polybutylene homopolymer to said polypropylene homopolymer or copolymer is from about 1:2 to about 2:1.
Claim 27
Dependent Claim
12 words
The method of claim 24, wherein the weight ratio is about 1:1.
Claim 28
Dependent Claim
19 words
The method of claim 16, wherein the thickness of said film is from about 0.5 to about 10 mils.
Claim 29
Dependent Claim
15 words
The method of claim 16, wherein the thickness of said film is about 1.5 mils.
Claim 30
Dependent Claim
15 words
The method of claim 16, wherein the thickness of said film is about 3.0 mils.
Claim 31
Dependent Claim
19 words
The method of claim 16, further comprising the step of fabricating a bag from a portion of said film.
Claim 32
Dependent Claim
13 words
The method of claim 29, wherein said bag is fabricated by heat sealing.
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) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |