Patent ID: 6384151
Filing Date: 2002-05-07
Classification: C08F,C08G,C08L

Abstract:
A dicyclopentadiene-modified unsaturated polyester produced by a process comprising the steps of:a) reacting maleic anhydride with water at a temperature of 100Â° C. to 140Â° C. to obtain a reaction mixture; b) reacting the reaction mixture with dicyclopentadiene (DCPD), a molar ratio (H2O/DCPD) of water to dicyclopentadiene being greater than 1 and a molar ratio (MA/DCPD) of maleic anhydride to dicyclopentadiene being 1.2 or more; and c) reacting the reaction product obtained in step b) with a polyhydric alcohol, or a polyhydric alcohol and a polybasic acid, to obtain an unsaturated polyester modified with dicyclopentadiene, wherein the dicyclopentadiene-modified unsaturated polyester has a weight-average molecular weight of 8000 or more and a ratio of weight-average molecular weight to number-average molecular weight of from 5 to 50.