Patent ID: 7723433

Claim:
A clear, impact modified, heat resistant polyvinyl halide composition comprising: (a) from about 20 to about 60 weight percent of at least one polyvinyl halide, based on the total combined weight of (a), (b) and (c); (b) from about 10 to about 25 weight percent of at least one clear impact modifier, based on the total combined weight of (a), (b) and (c), wherein the at least one clear impact modifier comprises a rubber and possesses a refractive index which is not more than about 2% above or below the refractive index of the polyvinyl halide; and (c) from about 25 to about 60 weight percent of at least one clear heat modifier, based on the total combined weight of (a), (b) and (c), wherein the at least on clear heat modifier consists of: from about 20 to about 60 weight percent of styrene, based on the total weight of the at least one clear heat modifier, from about 10 to 40 weight percent of an acrylonitrile, based on the total weight of the at least one clear heat modifier, and from about 15 to 55 weight percent of a methyl methacrylate, based on the total weight of the at least one clear heat modifier, wherein the at least one clear heat modifier possesses a refractive index which is not more than about 2% above or below the refractive index of the polyvinyl halide and is in the range of 1.53 to 1.55, and possesses a weight average molecular weight ranging from about 75,000 to about 400,000.