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US 5,208,082 AGranted
Blends and structures based on ethylene vinyl alcohol copolymer and selected amorphous polyamides
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard T. Chou
Life of this patent
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Abstract
A blend of 5 to 95 percent of an ethylene vinyl alcohol copolymer and 95 to 5 percent of an amorphous polyamide having fewer than about 0.100 equivalents of carboxyl end groups per kilogram of polyamide exhibits improved oxidative and thermal stability. The blend is useful for preparing films and multiple layered structures including thermoformed structures and oriented shrink films.
Claims12
A multiple layer structure wherein at least one of the layers is prepared from a blend consisting essentially of:
- (a) about 5 to about 95 percent by weight of at least one ethylene vinyl alcohol copolymer having a copolymerized ethylene content of about 20 to about 50 mole percent and a degree of saponification of at least about 90%, and
- (b) about 95 to about 5 percent by weight of a polyamide component comprising at least about 30 weight percent of at least one amorphous polyamide having a glass transition temperature of up to about 160.degree. C. and fewer than about 0.100 equivalents of carboxyl end groups per kilogram, said polyamide component forming a separate phase from that of the ethylene vinyl alcohol copolymer.
Dependencies are inferred from the claim text.