US4879177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monoaxially oriented shrink film
Assignee: Cryovac LLC
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Filing: 1987-11-13
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Granted: 1989-11-07
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Expires: 2007-11-13
Abstract
Abstract A coextruded multiple layer film is oriented in primarily the longitudinal direction, and comprises a core layer comprising butadiene styrene copolymer or copolyester, outer layers comprising ethylene propylene copolymer, polypropylene, or blends thereof, and intermediate layers which bond the outer layers to the core layer and comprise an ethylene copolymer.
Inventors
- 👤 Peter R. Boice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C55/00; B29C55/02; B29C55/023; B32B27/32; B32B27/36; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; B32B2323/10; B32B2367/00; B32B2519/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/26; Y10T428/269; Y10T428/31504; Y10T428/31786; Y10T428/31794; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
A multilayer film, oriented in primarily one direction, comprising: (a) a core layer comprising a copolyester; (b) two outer layers each comprising ethylene propylene copolymer, polypropylene, or blends thereof; and (c) two intermediate layers each bonding the core layer to a respective outer layer, and comprising an ethylene copolymer; and (d) film having a shrink tension in the longitudinal direction in the range of between about 750 and 1200 p.s.i.
Claim 2
Dependent Claim
70 words
A multilayer film, oriented in primarily one direction, comprising: (a) a core layer comprising a copolyester; (b) two outer layers each comprising ethylene propylene copolymer, polypropylene, or blends thereof; and (c) two intermediate layers each bonding the core layer to a respective outer layer, and comprising an ethylene copolymer; and (d) film having a shrink tension in the longitudinal direction in the range of between about 750 and 1200 p.s.i.
Claim 3
Dependent Claim
25 words
The film according to claim 1 wherein the outer layers each comprise a blend of about 92% ethylene propylene copolymer, and about 8% slip/antiblock masterbatch.
Claim 4
Dependent Claim
39 words
The film according to claim 1 wherein the intermediate layers each comprise an ethylene copolymer selected from the group consisting of ethylene vinyl acetate copolymer, ethylene alkyl acrylate copolymer, and very low density polyethylene and chemically modified polymeric adhesives.
Claim 5
Dependent Claim
74 words
A multilayer film, oriented in primarily one direction, comprising: (a) a cross-linked core layer comprising a copolyester; (b) two cross-linked outer layers each comprising ethylene propylene copolymer, polypropylene, or blends thereof; and (c) two cross-linked intermediate layers each bonding the core layer to a respective outer layer and comprising an ethylene copolymer; and (d) said film having a shrink tension in the longitudinal direction in the range of between about 750 and 1200 p.s.i.
Claim 6
Dependent Claim
74 words
A multilayer film, oriented in primarily one direction, comprising: (a) a cross-linked core layer comprising a copolyester; (b) two cross-linked outer layers each comprising ethylene propylene copolymer, polypropylene, or blends thereof; and (c) two cross-linked intermediate layers each bonding the core layer to a respective outer layer and comprising an ethylene copolymer; and (d) said film having a shrink tension in the longitudinal direction in the range of between about 750 and 1200 p.s.i.
Claim 7
Dependent Claim
35 words
The film according to claim 4 wherein the cross-linked intermediate layers each comprise an ethylene copolymer selected from the group consisting of ethylene vinyl acetate copolymer, ethylene alkyl acrylate copolymer, and very low density polyethylene.
References Cited (Backward Citations)
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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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |