Patent US4151328A successfully refreshed from Google Patents.
US4151328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-welding laminate compositions
Assignee: Cryovac LLC
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Filing: 1978-01-09
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Granted: 1979-04-24
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Expires: 1998-01-09
Abstract
Abstract A film useful as a packaging material having a self-adhering layer on the interior thereof has improved optical and adhesion characteristics. The self-adhering layer is composed of a terpolymer of ethylene, a vinyl ester and an alkenoic acid. The saran layer is plasticized with a polyester to synergistically improve both the optical and adhesive characteristics of the composite laminate.
Inventors
- 👤 Jack M. Kight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/22; B32B27/30; B32B27/304; C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/25; C09J7/255; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/514; B32B2439/00; Y; Y10; Y10S; Y10S526/00; Y10S526/937; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
In a packaging material comprising two layers, one layer being a self adherent material and the other layer being a saran layer, the improvement, comprising: the combination of said saran layer being plasticized with a sufficient amount of polyester to plasticize said saran, said polyester having a molecular weight between 1,000 and 10,000, said polyester being the product of an equimolar esterification reaction between adipic acid, azelaic acid or sebacic acid and propylene glycol, 1,3-butane diol, 1,4-butane diol or neopentyl glycol wherein the end group of the polyester is hydroxyl, carboxyl or esterified by aliphatic (C1 to C18), alicyclic aliphatic, heterocyclic or aromatic monocarboxylic acids or monoalcohols; and said self-adhering layer being a terpolymer of ethylene, a vinyl ester, and an alkenoic acid, with at least 60 weight percent ethylene, 20 to 40 weight percent vinyl ester and 0.1 to 10 weight alkenoic acid.
Claim 2
Dependent Claim
144 words
In a packaging material comprising two layers, one layer being a self adherent material and the other layer being a saran layer, the improvement, comprising: the combination of said saran layer being plasticized with a sufficient amount of polyester to plasticize said saran, said polyester having a molecular weight between 1,000 and 10,000, said polyester being the product of an equimolar esterification reaction between adipic acid, azelaic acid or sebacic acid and propylene glycol, 1,3-butane diol, 1,4-butane diol or neopentyl glycol wherein the end group of the polyester is hydroxyl, carboxyl or esterified by aliphatic (C1 to C18), alicyclic aliphatic, heterocyclic or aromatic monocarboxylic acids or monoalcohols; and said self-adhering layer being a terpolymer of ethylene, a vinyl ester, and an alkenoic acid, with at least 60 weight percent ethylene, 20 to 40 weight percent vinyl ester and 0.1 to 10 weight alkenoic acid.
Claim 3
Dependent Claim
41 words
The improvement according to claim 1 wherein said saran is a copolymer of vinylidene chloride and vinyl chloride containing from about 70 to about 90 weight percent of vinylidene chloride and from 10 to about 30 weight percent of vinyl chloride.
Claim 4
Dependent Claim
30 words
The improvement according to claim 1 wherein the vinyl ester of said terpolymer is selected from the group consisting of vinyl acetate, vinyl propionate, methylmethacrylate, ethyl methacrylate, ethylacrylate and isobutylacrylate.
Claim 5
Dependent Claim
13 words
The improvement according to claim 3 wherein said vinyl ester is vinyl acetate.
Claim 6
Dependent Claim
34 words
The improvement according to claim 1 wherein the alkenoic acid of said terpolymer is an alpha beta ethylenically unsaturated carboxylic acid having from 3 to about 10 carbon atoms per molecule of the acid.
Claim 7
Dependent Claim
31 words
The improvement according to claim 5 wherein said alkenoic acid is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, methylhydrogen maleate, maleic acid, acrylic acid methacrylic acid.
Claim 8
Dependent Claim
31 words
The improvement according to claim 1 wherein said laminate is oriented so as to provide a heat shrinkage of 30 to 70 percent in at least one direction at 205° F.
References Cited (Backward Citations)
CA834274A
Cited
US3132120A
Cited
US3215678A
Cited
US3573125A
Cited
US3647485A
Cited
US3520861A
Cited
US3625348A
Cited
US4021504A
Cited
US4070533A
Cited
US3976626A
Cited
US4053540A
Cited
US4010305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |