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US 4,447,494 AGranted
Oriented multilayer heat sealable packaging film
AssigneeMobil Oil Corporation
InventorsJohn R. Wagner, Jr., Carl C. Hein
Life of this patent
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Abstract
An oriented multilayer heat sealable film structure comprising a polyolefin film substrate, a layer of a random copolymer of ethylene and propylene, a primer layer on said copolymer layer and a layer of heat sealable vinylidene chloride polymer on said primer layer. The method of preparing said structure includes aging said structure at a temperature and for a time resulting in increased heat seal strength.
Claims17
A multilayer heat sealable structure comprising:
- (a) a substrate comprising a polyolefin film;
- (b) a layer on at least one surface of (a), said layer consisting essentially of a random copolymer of ethylene and propylene, said copolymer containing from about 0.5 to about 6% by weight of ethylene;
- (c) a primer coating between layers (b) and (d) on at least one of said layer (b);
- and
- (d) a heat sealable layer on said coating (c), said heat sealable layer comprising a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride.
2 more elements
Dependencies are inferred from the claim text.