Polyester compositions and processes for moulding them.

摘要

Compositions comprising (i) thermoplastic polyester of aliphatic diol and dicarboxylic acid, at least 95 mole percent of said acid being terephthalic acid, (ii) inert particulate nucleating agent (iii) plasticizer and/or oligomeric polyester and (iv) segmented polyester-polyether block copolymer are disclosed as useful moulding compounds. The preferred polyesters include poly (ethylene terephthalate) and the crystallization rate of the polyester component is promoted by components (iii) and or (iv) sothatthe compositions can be moulded to form crystalline products at low temperatures. Moulding processes of the invention are carried out at less than 100°C mould temperature.