US4335175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic film laminates
Assignee: Cryovac LLC
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Filing: 1980-10-01
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Granted: 1982-06-15
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Expires: 2000-10-01
Abstract
Abstract A coextruded film laminate having an ethylene-vinyl acetate copolymer/ethylene-acrylic acid copolymer/ionomer layer structure has superior delamination resistance and can preferably serve as a sealant structure in a composite laminate but can also serve as a substrate or covering web for many packaging applications, particularly for forming packages for foodstuffs.
Inventors
- 👤 James L. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:52
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/308; B32B37/00; B32B2037/0092; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A thermoplastic film laminate having improved delamination resistance comprising: (a) a first layer comprising an ethylene-vinyl acetate copolymer; (b) a second layer comprising an ethylene-acrylic acid copolymer, one surface of said first layer being bonded to one surface of the second layer; (c) a third layer comprising an ionomer, said third layer being bonded to the other surface of the second layer; and, (d) said first, second, and third layers being melt joined without adhesive therebetween.
Claim 2
Dependent Claim
76 words
A thermoplastic film laminate having improved delamination resistance comprising: (a) a first layer comprising an ethylene-vinyl acetate copolymer; (b) a second layer comprising an ethylene-acrylic acid copolymer, one surface of said first layer being bonded to one surface of the second layer; (c) a third layer comprising an ionomer, said third layer being bonded to the other surface of the second layer; and, (d) said first, second, and third layers being melt joined without adhesive therebetween.
Claim 3
Dependent Claim
38 words
The laminate of claim 1 wherein the total thickness of said laminate is in the range from 0.5 mils to 6.0 mils the thickness ratio of the first/second/third layers is approximately 70 to 76/15 to 12/15 to 12.
Claim 4
Dependent Claim
49 words
The laminate of claim 1 wherein vinyl acetate content of the ethylene-vinyl acetate copolymer is in the range of 4% to 14% by weight, the acrylic acid content of the ethylene-acrylic acid copolymer is in the range of 6 to 10% by weight, and the ionomer cation is zinc.
Claim 5
Dependent Claim
27 words
The laminate of claim 1 including at least one additional polymeric layer of nylon, said additional layer being bonded to the other surface of the first layer.
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) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |