1,217,567. Thermoplastic polyester moulding compositions. FARBWERKE HOECHST A.G. 22 July, 1968 [20 July, 1967], No. 34761/68. Heading C3R. A thermoplastic moulding composition comprises a mixture of (a) a linear saturated polyester of an aromatic dicarboxylic acid and a dihydric alcohol and (b) from 0À1 to 25% by weight of the mixture of a copolymer of ethylene and an alkyl ester of acrylic, methacrylic or ethacrylic acid, preferably of molecular weight 2000 to 1,000,000. The composition may also contain a nucleating agent, e.g. aluminium silicate of particle size less than 2 Á, calcium carbonate or talc. The granulated composition may be coated with paraffin wax or other wax. Specified polyesters are polyethylene terephthalate which may be modified by 2: 6 - naphthaledicarboxylic acid, adipic acid, 1: 4 - butanediol or neopentylene glycol and poly( 1: 4 - dimethylolcyclohexane terephthalate). The ingredients (a) and (b) may be mixed together in powder or molten form or granules of (a) may be treated with a solution of (b) and the solvent then evaporated. Examples disclose compositions of polyethylene terephthalate and copolymers of ethylene and ethyl or butyl acrylate.