Patent ID: 6350849
Filing Date: 2002-02-26
Classification: C08G,C08L

Abstract:
A method of producing polyesters comprising maleate groups in their main chain, characterized in that a mixture comprisinga) one or more &agr;,&bgr;-unsaturated anhydrides, selected from the group consisting of maleic anhydride, 2-substituted maleic anhydride derivatives, 2,3-disubstituted maleic anhydride derivatives, and compounds which are converted into maleic anhydride or one of said maleic anhydride derivatives during polymerization, b) one or more epoxides comprising 2 to 25 carbon atoms, wherein the ratio of the amount of epoxide or epoxides to the amount of anhydrides cited in a) is at least 1:1, is copolymerized in the presence of 0.01 to 5 mol-% of a Zn2+ carboxylate, with respect to the total amount of anhydride(s) and epoxide(s), at a temperature from 50 to 120Â° C.