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US 4,284,671 AGranted
Polyester compositions for gas and moisture barrier materials
AssigneeClopay Corporation
InventorsLeopoldo V. Cancio, Gerald W. Miller, Pai-Chuan Wu
Life of this patent
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Abstract
Polymer blends of a polyester and polyvinyl alcohol, or their copolymers, may be fabricated into barrier packaging materials having very low permeabilities to oxygen, other fixed gases and moisture.
Claims13
A gas and moisture barrier material fabricated into a structural layer comprising a polymer blend which consists essentially of
- (a) a polymer selected from the group of a polyester and copolymers thereof, and
- (b) poly(ethylene/vinyl alcohol).
Dependencies are inferred from the claim text.