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US 4,952,628 AGranted
Barrier blends based on amorphous polyamide and ethylene/vinyl alcohol, unaffected by humidity
AssigneeE. I. Du Pont de Nemours and Company
InventorPhilip S. Blatz
Life of this patent
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Abstract
A blend consisting essentially of a major portion of an amorphous polyamide and a minor portion of an ethylene vinyl alcohol copolymer exhibits gas barrier properties which are less dependent on humidity than are those of either of the component polymers. Films and laminated structures which incorporate the material of these blends are suitable for use as packaging materials.
Claims14
A blend consisting essentially of about 50 to about 95 weight percent of an amorphous polyamide having a glass transition temperature of about 90.degree. C. to about 200.degree. C.;
- and about 5 to about 50 weight percent of a vinyl alcohol polymer having a copolymerized ethylene content of 0 to about 60 mol percent and a degree of saponification of at least about 90%, the percentages of the polyamide and vinyl alcohol polymers being based on the total weight of polymers in the blend.
Dependencies are inferred from the claim text.