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US 4,734,327 AGranted
Cook-in shrink film
AssigneeViskase Corporation
InventorStephen J. Vicik
Life of this patent
Estimating the term…
Abstract
An irradiated three layer heat shrinkable plastic film comprising an EVOH - Nylon core layer as an oxygen barrier, a first outer layer comprising a blend of EVA and C6-C8 olefin type LLDPE, and a second outer layer comprising EVA.
Claims20
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.degree. F., said core layer providing an oxygen transmission rate through the film below about 90 cc/m.sup.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 10 and 25 wt. % linear low density polyethylene being a copolymer of C6 to C8 olefin and ethylene;
- 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;
- (d) said film having been irradiated at a level of between about 1 and 5 MR.
2 more elements
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.sup.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 15 and 20 wt. % linear low density polyethylene being a copolymer of hexene-1 and ethylene;
- 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 up to about 5 wt. % linear low density polyethylene being a copolymer of butene-1 and ethylene;
- (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.
2 more elements
Dependencies are inferred from the claim text.