US5004647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen barrier biaxially oriented film
Assignee: Cryovac LLC
•
Filing: 1988-05-27
•
Granted: 1991-04-02
•
Expires: 2008-05-27
Abstract
Abstract A coextruded multiple layer oriented film comprises a core layer of ethylene vinyl alcohol copolymer, two intermediate adhesive layers, and two outer layers of a blend of linear low density polyethylene and a very low density polyethylene. A preferred embodiment of the multilayer film exhibits improved heat seal strengths, and excellent optics and shrink properties while providing high oxygen barrier especially useful in food packaging applications.
Inventors
- 👤 Gautam P. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31931
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
An oriented multilayer film comprising: (a) a cross-linked core layer comprising an ethylene vinyl alcohol copolymer; (b) two cross-linked interior layers each comprising an adhesive polymeric material; and (c) two cross-linked outer layers each comprising a blend of (1 ) from about 70%, by weight, to about 80%, by weight of a linear low density polyethylene and (2) from about 20%, by weight, to about 30%, by weight, of a very low density polyethylene.
Claim 2
Dependent Claim
74 words
An oriented multilayer film comprising: (a) a cross-linked core layer comprising an ethylene vinyl alcohol copolymer; (b) two cross-linked interior layers each comprising an adhesive polymeric material; and (c) two cross-linked outer layers each comprising a blend of (1 ) from about 70%, by weight, to about 80%, by weight of a linear low density polyethylene and (2) from about 20%, by weight, to about 30%, by weight, of a very low density polyethylene.
Claim 3
Dependent Claim
64 words
An oriented multilayer film comprising: (a) a cross-linked core layer comprising an ethylene vinyl alcohol copolymer; (b) two cross-linked interior layers each comprising an acid or acid anhydride-modified polymeric material; and (c) two cross-linked outer layers each comprising a blend of (1) about 75%, by weight, of a linear low density polyethylene and (2) about 25%, by weight, of a very low density polyethylene.
Claim 4
Dependent Claim
64 words
An oriented multilayer film comprising: (a) a cross-linked core layer comprising an ethylene vinyl alcohol copolymer; (b) two cross-linked interior layers each comprising an acid or acid anhydride-modified polymeric material; and (c) two cross-linked outer layers each comprising a blend of (1) about 75%, by weight, of a linear low density polyethylene and (2) about 25%, by weight, of a very low density polyethylene.
Claim 5
Dependent Claim
13 words
The film of claim 1 wherein the core layer further comprises a polyamide.
Claim 6
Dependent Claim
39 words
The film of claim 3 wherein the core layer comprises a blend of (1) between about 80% and 99% by weight of an ethylene vinyl alcohol copolymer, and (2) between about 1% and 20% by weight of a polyamide.
Claim 7
Dependent Claim
29 words
The film of claim 3 wherein the core layer comprises a blend of (1) about 90% of an ethylene vinyl alcohol copolymer, and (2) about 10% of a polyamide.
Claim 8
Dependent Claim
29 words
The film of claim 1 which has been oriented by racking at a racking ratio of from about 3.0 to about 5.0 in both the longitudinal and transverse directions.
Claim 9
Dependent Claim
25 words
The film of claim 6 which has been oriented by racking at a racking ratio of about 3.5 in both the longitudinal and transverse directions.
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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) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |