VINYL HALIDE POLYMERS MODIFIED WITH OLEFINIC NITRILE POLYMERS

摘要

Vinyl halide polymer compositions exhibiting reduced gas permeability are described which comprise a mixture of (a) at least one vinyl halide polymer; and (B) from about 1 to about 40 parts by weight per 100 parts of vinyl halide polymer (A) of at least one olefinic nitrile polymer. The vinyl halide polymers preferably are vinyl chloride homopolymers and copolymers, and the olefinic nitrile polymers are copolymers of an olefinically unsaturated nitrile such as acrylonitrile and one or more monomers from the group of conjugated dienes, monoolefins, olefinically unsaturated carboxylic acid esters, and vinyl aromatic compounds. The olefinic nitrile polymer can be chosen or manufactured to have a refractive index which is similar to the refractive index of the vinyl halide polymer thereby resulting in a more transparent composition.