Patent ID: 6417266
Filing Date: 2002-07-09
Classification: C08G

Abstract:
A process for preparing an aliphatic polyester, wherein a crystallized aliphatic polyester prepolymer formed consisting essentially of an aliphatic dihydric alcohol and an aliphatic dicarboxylic acid and having a weight-average molecular weight (Mw1) falling within the range defined by a formula (1) is caused to undergo solid-phase polymerization in the presence of a volatile catalyst to make an aliphatic polyester having a weight-average molecular weight (Mw2) falling within the range defined by formulas (2) and (3):2Ã—103&lE;Mw1&lE;1Ã—105â€ƒâ€ƒ(1) 5Ã—104&lE;Mw2&lE;1Ã—106â€ƒâ€ƒ(2) Mw12â€ƒâ€ƒ(3).