Patent ID: 8242209

Claim:
A composition comprising a mixture of a poly(trimethylene terephthalate) polymer composition, 0.005 to about 1 weight % of a nucleating agent, and about 1 to 15 weight % of an ethylene copolymer, based on the weight of the mixture, wherein the composition has at least 50% increase in a notched Izod test conducted according to ASTM procedure D256 or ISO 180 compared to a composition consisting essentially of the poly(trimethylene terephthalate) polymer composition and the nucleating agent; the melt viscosity of the composition is lower than the melt viscosity of a corresponding composition that does not comprise the ethylene copolymer; the nucleating agent is a sodium salt of a carboxylic acid; and the ethylene copolymer prepared by polymerization of ethylene and at least one ester comonomer having the formula CH 2 ═C(R 1 )CO 2 R 2 , where R 1 is hydrogen or an alkyl group having 1 to 6 carbon atoms and R 2 is an alkyl group having 1 to 8 carbon atoms.