US5629059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer packaging film and receptacles made therefrom
Assignee: Cryovac LLC
•
Filing: 1993-12-07
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Granted: 1997-05-13
•
Expires: 2013-12-07
Abstract
Abstract A multi-layer, oriented, heat shrinkable thermoplastic film comprising: (i) a layer composed of a blend of ethylene-vinyl acetate copolymer and a linear ethylene-alpha-olefin copolymer; (ii) a layer composed of (a) a linear ethylene-alpha-olefin copolymer; (b) a material selected from the group consisting of ethylene-vinyl acetate copolymers and ethylene-n-butyl acrylate copolymers; and (c) a narrow molecular weight linear ethylene-alpha-olefin copolymer having a density of less than 0.900 g/cc; (iii) a layer composed of a vinylidene chloride copolymer or an ethylene-vinyl acetate copolymer in which the acetate moieties have been partially or completely hydrolyzed; and (iv) a layer composed of a copolymer of ethylene-vinyl acetate or a blend of ethylene-vinyl acetate copolymer and ethylene-alpha-olefin copolymer.
Inventors
- 👤 Bankim B. Desai
- 👤 David H. Thomson
- 👤 William A. Moir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:59
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B32B2270/00; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2439/00; B65; B65D; B65D75/00; B65D75/002; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1334; Y10T428/1341; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/139; Y10T428/1393; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
95 words
A multi-layer, oriented, heat shrinkable thermoplastic film comprising: (i) a first layer comprising an ethylene-vinyl acetate copolymer or a linear ethylene-alpha-olefin copolymer or a blend of an ethylene-vinyl acetate copolymer and a linear ethylene-alpha-olefin copolymer; and (ii) a second layer comprising a blend of (a) a linear ethylene-alpha olefin copolymer; (b) a material selected from the group consisting of ethylene-vinyl acetate copolymers, ethylene-butyl acrylate copolymers, ethylene-methyl acrylate copolymers, ethylene-methyl methacrylate copolymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymer and ethylene-carbon monoxide copolymers; and (c) homogeneous linear ethylene-alpha-olefin copolymer having a density of less than 0.900 g/cc.
Claim 2
Dependent Claim
95 words
A multi-layer, oriented, heat shrinkable thermoplastic film comprising: (i) a first layer comprising an ethylene-vinyl acetate copolymer or a linear ethylene-alpha-olefin copolymer or a blend of an ethylene-vinyl acetate copolymer and a linear ethylene-alpha-olefin copolymer; and (ii) a second layer comprising a blend of (a) a linear ethylene-alpha olefin copolymer; (b) a material selected from the group consisting of ethylene-vinyl acetate copolymers, ethylene-butyl acrylate copolymers, ethylene-methyl acrylate copolymers, ethylene-methyl methacrylate copolymers, ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymer and ethylene-carbon monoxide copolymers; and (c) homogeneous linear ethylene-alpha-olefin copolymer having a density of less than 0.900 g/cc.
Claim 3
Dependent Claim
23 words
A film according to claim 1 wherein the first layer comprises a blend of an ethylene-vinyl acetate copolymer and a linear ethylene-alpha-olefin copolymer.
Claim 4
Dependent Claim
23 words
A film according to claim 1 wherein the linear ethylene-alpha-elfin copolymer present in the first layer has a density of about 0.920 g/cc.
Claim 5
Dependent Claim
21 words
A film according to claim 1, wherein the second layer has a thickness greater than the thickness of the first layer.
Claim 6
Dependent Claim
17 words
A film according to claim 1 which comprises a further layer of material resistant to oxygen transmission.
Claim 7
Dependent Claim
19 words
A film according to claim 5 wherein the material resistant to oxygen transmission comprises a copolymer of vinylidene chloride.
Claim 8
Dependent Claim
22 words
A film according to claim 5 wherein the material resistant to oxygen transmission comprises a copolymer of vinylidene chloride and vinyl chloride.
Claim 9
Dependent Claim
22 words
A film according to claim 5 wherein the material resistant to oxygen transmission comprises a copolymer of vinylidene chloride and methyl acrylate.
Claim 10
Dependent Claim
30 words
A film according to claim 5 wherein the material resistant to oxygen transmission comprises a copolymer of ethylene-vinyl acetate in which the acetate moieties have been partially or completely hydrolyzed.
Claim 11
Dependent Claim
25 words
A film according to any one of claims 1 to 3 or 5 to 9 which comprises a further layer comprising a thermoplastic polymeric material.
Claim 12
Dependent Claim
26 words
A film according to claim 10 wherein said further layer comprises a copolymer of ethylene-vinyl acetate or a blend comprising ethylene-vinyl acetate and linear ethylene-alpha-olefin copolymer.
Claim 13
Dependent Claim
113 words
A film according to claim 4 wherein: the first layer comprises a blend of ethylene-vinyl acetate copolymer and the linear ethylene-alpha-olefin copolymer; the second layer comprises: (a) a linear low density polyethylene; (b) a material selected from the group consisting of ethylene-vinyl acetate copolymers and ethylene-n-butyl acrylate copolymers; and (c) a homogeneous linear ethylene-alpha-olefin copolymer having a density of less than 0.900 g/cc; and wherein the film further comprises: a third layer comprising a vinylidene chloride copolymer or an ethylene-vinyl acetate copolymer in which the acetate moieties have been partially or completely hydrolyzed; and a fourth layer comprising a copolymer of ethylene-vinyl acetate or a blend of ethylene-vinyl acetate copolymer and ethylene-alpha-olefin copolymer.
Claim 14
Dependent Claim
46 words
A film according to claim 12 wherein in the first layer the ethylene-vinyl acetate copolymer has a vinyl acetate content of about 6%, and the blend comprises about 90% by weight of the ethylene-vinyl acetate copolymer and about 10% by weight of the linear ethylene-alpha-olefin copolymer.
Claim 15
Dependent Claim
25 words
A film according to claim 12 wherein (c) in the second layer comprises a homogeneous linear ethylene-alpha-olefin copolymer having a density of about 0.885 g/cc.
Claim 16
Dependent Claim
31 words
A film according to claim 12 wherein (c) in the second layer comprises a homogeneous linear ethylene-alpha-olefin copolymer having a density of between about 0.860 g/cc and less than 0.900 g/cc.
Claim 17
Dependent Claim
52 words
A film according to claim 12 wherein the second layer comprises: (a) about 50% by weight of the layer of a linear ethylene-octene copolymer, (b) about 20% by weight of the layer of an ethylene-n-butyl acrylate copolymer and (c) about 30% by weight of the layer of the homogeneous linear ethylene-alpha-olefin copolymer.
Claim 18
Dependent Claim
28 words
A film according to claim 12 wherein (b) in the second layer comprises an ethylene-vinyl acetate copolymer that has a vinyl acetate content of about 18% by weight.
Claim 19
Dependent Claim
21 words
A film according to claim 16 wherein the ethylene-n-butyl acrylate copolymer has a butyl acrylate content of about 18.5% by weight.
Claim 20
Dependent Claim
33 words
A film according to any one of claims 12 to 18 wherein the third layer comprises a copolymer of vinylidene chloride and methyl acrylate and the fourth layer comprises an ethylene-vinyl acetate copolymer.
Claim 21
Dependent Claim
52 words
A film according to claim 19 wherein in the third layer the copolymer of vinylidene chloride and methyl acrylate contains about 91.5% by weight of vinylidene chloride and about 8.5% by weight of methyl acrylate, and in the fourth layer the ethylene-vinyl acetate copolymer has a vinyl acetate content of about 9%.
Claim 22
Dependent Claim
35 words
A film according to any one of claims 1 to 9, or 12 to 18, wherein the homogeneous linear ethylene-alpha-olefin copolymer comprises a constrained geometry catalyst technology resin or a single site metallocene catalyzed resin.
Claim 23
Dependent Claim
18 words
A bag comprising a film according to any one of claims 1 to 9 or 12 to 18.
Claim 24
Dependent Claim
20 words
A film according to claim 21 wherein the homogeneous linear ethylene alpha-olefin copolymer comprises a constrained geometry catalyst technology resin.
Claim 25
Dependent Claim
19 words
A film according to claim 21 wherein the homogeneous linear ethylene alpha-olefin copolymer comprises a single-site metallocene catalyzed resin.
Claim 26
Dependent Claim
26 words
The film according to claim 1, wherein in the second layer, the linear ethylene-alpha olefin copolymer has a density of from about 0.91 to 0.94 g/cc.
Claim 27
Dependent Claim
26 words
The film according to claim 25, wherein in the second layer, the linear ethylene-alpha olefin copolymer has a density of from about 0.912 to 0.928 g/cc.
Claim 28
Dependent Claim
21 words
The film according to claim 1, wherein in the second layer, the linear ethylene-alpha olefin copolymer comprises linear low density polyethylene.
Claim 29
Dependent Claim
20 words
The film according to claim 1, wherein in the second layer, the linear ethylene-alpha olefin copolymer comprises low density polyethylene.
Claim 30
Dependent Claim
42 words
The film according to claim 1, wherein in the second layer, the linear ethylene-alpha olefin copolymer comprises a copolymer of ethylene and at least one member selected from the group consisting of C 4 -olefin, C 6 -olefin, and C 8 -olefin.
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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) | 2000-05-12 | 2000-11-11 | 2001-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-12 | 2004-11-11 | 2005-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-12 | 2008-11-11 | 2009-05-13 | $7700.00 | Window Closed / Lapsed |