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US4278738A
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Ethylene-vinyl acetate copolymer film laminate
Assignee: Cryovac LLC
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Filing: 1979-07-16
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Granted: 1981-07-14
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Expires: 1999-07-16
Abstract
Abstract A film of ethylene vinyl acetate having a narrow molecular weight distribution and a saran composition that is a blend of emulsion and suspension polymerized saran or a saran composition that includes emulsion polymerized saran of the type generally considered suitable for liquid coating. A laminate including the film and composition and the method for production thereof including sequentially melt extruding tubular films of ethylene vinyl acetate which is irradiated, saran and ethylene vinyl acetate and then bubble orienting the three-ply laminate. The laminate is employed for packaging and forming packages of bone-in fresh red meat.
Inventors
- 👤 Harri J. Brax
- 👤 Joseph F. Porinchak
- 👤 Alan S. Weinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:00
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0016; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B32B27/30; B32B27/304; B32B27/306; B32B2305/00; B32B2305/72; B32B2310/00; B32B2310/08; B32B2310/0875; B32B2310/0881; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31938
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
51 words
A multi-ply, thermoplastic film laminate comprising: (a) a first ply being a substrate layer consisting essentially of a cross-linked ethylene-vinyl acetate copolymer; (b) a second ply comprising a barrier material selected from the group consisting of vinyl chloride-vinylidene chloride copolymers, and, (c) a third ply comprising an uncross-linked ethylene-vinyl acetate copolymer.
Claim 2
Dependent Claim
51 words
A multi-ply, thermoplastic film laminate comprising: (a) a first ply being a substrate layer consisting essentially of a cross-linked ethylene-vinyl acetate copolymer; (b) a second ply comprising a barrier material selected from the group consisting of vinyl chloride-vinylidene chloride copolymers, and, (c) a third ply comprising an uncross-linked ethylene-vinyl acetate copolymer.
Claim 3
Dependent Claim
19 words
The multi-ply film laminate of claim 1 wherein the film laminate has been biaxially oriented and is heat shrinkable.
Claim 4
Dependent Claim
23 words
The multi-ply film laminate of claim 1 wherein said second ply is directly joined to the two adjacent layers comprising ethylene-vinyl acetate copolymer.
Claim 5
Dependent Claim
20 words
The multi-ply film laminate of claim 1 wherein the copolymer in said first ply has been cross-linked by ionizing radiation.
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) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |