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US 4,352,849 AGranted
Coextruded, heat-shrinkable, multi-layer, polyolefin packaging film
AssigneeW. R. Grace & Co.
InventorWalter B. Mueller
Life of this patent
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Abstract
The multi-layer polyolefin shrink film of this invention provides a unique combination of shrink tension, optical clarity, cuttability, sealability, shrink temperature range, and tear resistance which is highly desirable for many packaging applications. The preferred film has three layers in which the core layer comprises an ethylene-vinyl acetate copolymer blended with an ethylene-propylene copolymer and each surface layer comprises an ethylene-propylene copolymer.
Claims8
A multilayer, heat shrinkable packaging film comprising:
- (a) a core layer consisting essentially of from 5% to 50% by weight of an ethylene-propylene copolymer blended with 95% to 50% by weight of an ethylene-vinyl acetate copolymer wherein the vinyl acetate content of the ethylene-vinyl acetate copolymer is in the range of 4% to 18%;
- and
- (b) skin or surface layers comprising an ethylene-propylene copolymer, wherein the ethylene content of the ethylene-propylene copolymer in the core blend and the surface layer is in the range of 1% to 6% by weight.
Dependencies are inferred from the claim text.