Abstract: According to the invention, an amorphous copolyester is prepared by contacting, under polymerization conditions an aromatic dicarboxylic acid or ester or anhydride thereof, a 2,2,4,4-tetraalkyl-1,3-cyclobutanediol and 1,3-propanediol or 1,4-butanediol. The resulting copolyester exhibits superior thermal and impact properties.

Abstract: Polymeric styrene compositions having high optical transparency, impact strength and heat distortion temperature properties comprising the polymeric reaction product of:A. 100 parts by weight of a monomeric mixture of:(1) about 25-75% vinyl aromatic monomer selected from the group consisting of substituted and unsubstituted styrenes;(2) about 5-70% methyl or ethyl methacrylate; and(3) about 5-60% of an alkyl methacrylate having at least four carbon atoms in the alkyl group; andB. about 2-30 parts by weight of a rubber selected from the group consisting of butadiene and a block copolymer of butadiene and styrene containing up to 50% by weight styrene.