U.S. Pat. No. 4,915, 893 describes spinning polyesters such as polylactide with an additive such as a polyurethane, glycolide, lactide, camphor, benzoic acid-2-hydroxyacetate, hexamethylbenzene, 1,2-cyclohexandione and other low molecular weight organic compounds which are preferably soluble in trichlormethane and/or dichlormethane and ethanol and having a melting temperature in the range of 40???