US4758463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cook-in shrink film
Assignee: Viskase Corp
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Filing: 1986-12-29
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Granted: 1988-07-19
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Expires: 2006-12-29
Abstract
Abstract An irradiated three layer heat-shrinkable plastic film for cook-in applications comprising a core layer of EVOH and Nylon blend as an oxygen barrier, and first and second outer layers each comprising a blend of EVA and ethylene vinyl acetate-anhydride functionality compound.
Inventors
- 👤 Stephen J. Vicik
- 👤 Gary A. Rejniak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:55
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/16; B32B27/30; B32B27/306; B32B27/34; B65; B65D; B65D81/00; B65D81/34; B65D81/3415; B65D81/3423; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/732; B32B2307/734; B32B2307/736; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
179 words
A three layer plastic film comprising: (a) a core layer of between about 60 and 90 wt. % hydrolyzed ethylene vinyl acetate copolymer containing between about 28 and 40 wt. % ethylene and blended with between about 10 and 40 wt. % amide polymer having a melting point below about 420° F., said core layer providing an oxygen transmission rate through the film below about 90 cc/m 2 /mil thickness/24 hrs/Atm; (b) a first outer layer directly adhered to one side of said core layer comprising a blend of ethylene vinyl acetate containing between about 7 and 15 wt. % vinyl acetate, and between about 5 and 20 wt. % of an ethylene vinyl acetate-anhydride functionality compound; and (c) a second outer layer directly adhered to the other side of said core layer and comprising ethylene vinyl acetate containing between about 7 and 15 wt. % vinyl acetate, and between about 5 and 20 wt. % of an ethylene vinyl acetate-anhydride functionality compound; (d) said film having been irradiated at a level of between about 1 and 5 MR.
Claim 2
Dependent Claim
179 words
A three layer plastic film comprising: (a) a core layer of between about 60 and 90 wt. % hydrolyzed ethylene vinyl acetate copolymer containing between about 28 and 40 wt. % ethylene and blended with between about 10 and 40 wt. % amide polymer having a melting point below about 420° F., said core layer providing an oxygen transmission rate through the film below about 90 cc/m 2 /mil thickness/24 hrs/Atm; (b) a first outer layer directly adhered to one side of said core layer comprising a blend of ethylene vinyl acetate containing between about 7 and 15 wt. % vinyl acetate, and between about 5 and 20 wt. % of an ethylene vinyl acetate-anhydride functionality compound; and (c) a second outer layer directly adhered to the other side of said core layer and comprising ethylene vinyl acetate containing between about 7 and 15 wt. % vinyl acetate, and between about 5 and 20 wt. % of an ethylene vinyl acetate-anhydride functionality compound; (d) said film having been irradiated at a level of between about 1 and 5 MR.
Claim 3
Dependent Claim
26 words
A film according to claim 1 wherein said ethylene vinyl acetate-anhydride functionality compound comprises between about 8 and 12 wt. % of said first outer layer.
Claim 4
Dependent Claim
26 words
A film according to claim 1 wherein said ethylene vinyl acetate-anhydride functionality compound comprises between about 8 and 12 wt. % of said second outer layer.
Claim 5
Dependent Claim
19 words
A film according to claim 1 wherein said amide polymer in the core layer is a Nylon 6 copolymer.
Claim 6
Dependent Claim
15 words
A film according to claim 2 wherein said Nylon 6 copolymer is Nylon 6, 66.
Claim 7
Dependent Claim
21 words
A film according to claim 1 wherein said hydrolyzed ethylene-vinyl acetate copolymer contains between about 32 and 38 wt. % ethylene.
Claim 8
Dependent Claim
24 words
A film according to claim 1 wherein the oxygen transmission rate of said core layer is below about 75 cc/M 2 /mil thickness/24 hrs/Atm.
Claim 9
Dependent Claim
21 words
A film according to claim 1 wherein the total thickness of the three layers is between about 2.0 and 3.5 mils.
Claim 10
Dependent Claim
19 words
A film according to claim 7 wherein the thickness of said core layer is up to about 0.3 mils.
Claim 11
Dependent Claim
25 words
A film according to claim 1 wherein the ethylene-vinyl acetate of said first outer layer contains between about 9 and 12 wt. % vinyl acetate.
Claim 12
Dependent Claim
21 words
A film according to claim 8 wherein the thickness of said first outer layer is between about 1.2 and 2.6 mils.
Claim 13
Dependent Claim
26 words
A film according to claim 1 wherein the ethylene vinyl acetate of said second outer layer contains between about 9 and 12 wt. % vinyl acetate.
Claim 14
Dependent Claim
21 words
A film according to claim 8 wherein the thickness of said second outer layer is between about 1.2 and 2.6 mils.
Claim 15
Dependent Claim
19 words
A film according to claim 1 which is irradiated at a level of between about 2 and 4 MR.
Claim 16
Dependent Claim
16 words
A film according to claim 1 wherein said ethylene vinyl acetate-anhydride functionality compound is a terpolymer.
Claim 17
Dependent Claim
21 words
A film according to claim 1 wherein said ethylene vinyl acetate-anhydride functionality compound is ethylene vinyl acetate with anhydride grafted thereto.
Claim 18
Dependent Claim
205 words
A three layer plastic film comprising: (a) a core layer of between about 75 and 85 wt. % hydrolyzed ethylene-vinyl acetate copolymer containing between about 32 and 38 wt. % ethylene and blended with between about 15 and 25 wt. % Nylon 6, 66 copolymer, said core layer having an oxygen transmission rate below about 75 cc/M 2 /mil thickness/24 hrs/Atm and thickness of between about 0.05 and 0.2 mils; (b) a first outer layer of thickness between about 1.2 and 2.6 mils directly adhered to one side of said core layer comprising a blend of ethylene vinyl acetate containing between about 9 and 12 wt. % vinyl acetate, and between about 8 and 12 wt. % ethylene vinyl acetate-anhydride functionality terpolymer; and (c) a second outer layer of thickness between about 0.3 and 1.0 mils directly adhered to the other side of said core layer and comprising a blend of ethylene-vinyl acetate containing between about 9 and 12 wt. % vinyl acetate, and between about 8 and 12 wt. % ethylene vinyl acetate-anhydride functionality terpolymer; and (d) said film having a total thickness of between about 2.0 and 3.5 mils and having been irradiated at a level of between about 2 and 4 MR.
Claim 19
Dependent Claim
205 words
A three layer plastic film comprising: (a) a core layer of between about 75 and 85 wt. % hydrolyzed ethylene-vinyl acetate copolymer containing between about 32 and 38 wt. % ethylene and blended with between about 15 and 25 wt. % Nylon 6, 66 copolymer, said core layer having an oxygen transmission rate below about 75 cc/M 2 /mil thickness/24 hrs/Atm and thickness of between about 0.05 and 0.2 mils; (b) a first outer layer of thickness between about 1.2 and 2.6 mils directly adhered to one side of said core layer comprising a blend of ethylene vinyl acetate containing between about 9 and 12 wt. % vinyl acetate, and between about 8 and 12 wt. % ethylene vinyl acetate-anhydride functionality terpolymer; and (c) a second outer layer of thickness between about 0.3 and 1.0 mils directly adhered to the other side of said core layer and comprising a blend of ethylene-vinyl acetate containing between about 9 and 12 wt. % vinyl acetate, and between about 8 and 12 wt. % ethylene vinyl acetate-anhydride functionality terpolymer; and (d) said film having a total thickness of between about 2.0 and 3.5 mils and having been irradiated at a level of between about 2 and 4 MR.
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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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |