Patent ID: 6923925

Claim:
A process for preparing poly(trimethylene dicarboxylate) multifilament yarn comprising (a) providing a polymer blend comprising poly(trimethylene dicarboxylate) and about 0.01 to about 10 weight % styrene polymer, by weight of the polymer in the polymer blend, (b) spinning the polymer blend to form poly(trimethylene dicarboxylate) multiconstituent filaments containing dispersed styrene polymer, and (c) processing the multiconstituent filaments into poly(trimethylene dicarboxylate) multifilament yarn comprising poly(trimethylene dicarboxylate) multiconstituent filaments containing styrene polymer dispersed throughout the filaments, wherein the multifilament yarn is partially oriented yarn, the spinning comprises extruding the polymer blend through a spinneret at a spinning speed of at least about 3,000 m/m, and wherein the processing comprises interlacing and winding the filaments.