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US4608286A
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US
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Gas barrier multilayer packaging material having excellent flexing endurance
Assignee: Kuraray Co Ltd
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Filing: 1985-01-22
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Granted: 1986-08-26
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Expires: 2005-01-22
Abstract
Abstract A gas barrier multilayer packaging material having excellent flexing endurance, which comprises a thin layer of a saponified product of an ethylene-vinyl acetate copolymer as an intermediate layer and linear low-density polyethylene layers as inner and outer layers. This packaging material is especially useful as inner containers for a bag-in-box or bag-in-carton.
Inventors
- 👤 Yasuo Motoishi
- 👤 Kenji Satoh
- 👤 Kyoichiro Ikari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:24
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/30; B32B27/306; B32B7/00; B32B7/04; B32B7/12; B65; B65D; B65D77/00; B65D77/04; B65D77/06; B65D77/062; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2323/00; B32B2323/04; B32B2323/046; B32B2439/00; B32B2439/40; B32B2439/62; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
80 words
A gas barrier multilayer food packaging material having excellent flexing endurance suitable for use as an inner container in a bag-in-box or bag-in-carton assembly, which comprises an intermediate layer of a saponified product of an ethylene-vinyl acetate copolymer having a thickness of from 5-20μ, and surface layers of linear low-density polyethylene on both sides of said intermediate layer, each of said surface layers having a thickness of from 25-60μ, the layers being adhered to each other by an adhesive resin.
Claim 2
Dependent Claim
80 words
A gas barrier multilayer food packaging material having excellent flexing endurance suitable for use as an inner container in a bag-in-box or bag-in-carton assembly, which comprises an intermediate layer of a saponified product of an ethylene-vinyl acetate copolymer having a thickness of from 5-20μ, and surface layers of linear low-density polyethylene on both sides of said intermediate layer, each of said surface layers having a thickness of from 25-60μ, the layers being adhered to each other by an adhesive resin.
Claim 3
Dependent Claim
26 words
The multilayer packaging material according to claim 1 wherein the linear low-density polyethylene uses an α-olefin of 4 or more carbon atoms as a copolymerizable component.
Claim 4
Dependent Claim
33 words
The multilayer packaging material according to claim 1 wherein the heat of fusion of the linear low-density polyethylene as measured by thermal analysis by a differential scanning calorimeter is 25 cal/g or less.
Claim 5
Dependent Claim
38 words
The multilayer packaging material according to claim 3 wherein the linear low-density polyethylene uses butene-1 as a copolymerizable component and has a heat of fusion by thermal analysis by a differential scanning calorimeter of 15 cal/g or less.
Claim 6
Dependent Claim
26 words
The multilayer packaging material according to claim 1 wherein the Young's modulus at 20° C. of the linear low-density polyethylene is 22 kg/mm 2 or less.
Claim 7
Dependent Claim
32 words
The multilayer packaging material according to claim 5 wherein the linear low-density polyethylene uses butene-1 as a copolymerizable component and has Young's modulus at 20° C. of 12 kg/mm 2 or less.
Claim 8
Dependent Claim
26 words
The multilayer packaging material according to claim 1 wherein the linear low-density polyethylene uses an α-olefin of 5 or more carbon atoms as a copolymerizable component.
Claim 9
Dependent Claim
19 words
The multilayer packaging material according to claim 7 wherein the linear low-density polyethylene uses 4-methyl-1-pentene as a copolymerizable component.
Claim 10
Dependent Claim
36 words
The multilayer packaging material according to claim 1 wherein the adhesive resin is a modified olefinic polymer containing carboxyl groups obtained by chemically combining an ethylenically unsaturated carboxylic acid or its anhydride with the olefinic polymer.
Claim 11
Dependent Claim
38 words
The multilayer packaging material according to claim 9 wherein the modified olefinic polymer containing carboxyl groups is that obtained by chemically combining 0.01-15% by weight of an ethylenically unsaturated carboxylic acid or its anhydride with the olefinic polymer.
Claim 12
Dependent Claim
17 words
The multilayer packaging material according to claim 9 wherein the olefinic polymer is an ethylene-vinyl acetate copolymer.
Claim 13
Dependent Claim
25 words
The multilayer packaging material according to claim 11 wherein the olefinic polymer is an ethylene-vinyl acetate copolymer containing 5-55% by weight of the vinyl acetate.
Claim 14
Dependent Claim
17 words
The multilayer packaging material according to claim 9 wherein the olefinic polymer is an ethylene-ethyl acrylate copolymer.
Claim 15
Dependent Claim
25 words
The multilayer packaging material according to claim 13 wherein the olefinic polymer is an ethylene-ethyl acrylate copolymer containing 8-35% by weight of the ethyl acrylate.
Claim 16
Dependent Claim
35 words
The multilayer packaging material according to claim 8 wherein the saponified product of an ethylene-vinyl acetate copolymer has an ethylene content of 20-60 mole % and a degree of saponification of 95 mole or more.
References Cited (Backward Citations)
US3932692A
Cited
US4495249A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |