Patent ID: 6646062
Filing Date: 2003-11-11
Classification: C07C,C08G

Abstract:
A process for producing a high molecular weight polyester comprising reacting one or more preformed linear polyesters with at least 0.07 mole % of one or more cores to form high molecular weight polyesters; wherein the preformed linear polyesters are at a temperature in the range from the melting point of said preformed linear polyesters to 330Â° C.; and wherein the cores are selected from the group consisting of:(i) a compound of the formula: â€ƒwherein R1 is â€”OCH2CH2Oâ€”, â€ƒand R2 is â€”OH, â€”OCOCH3, â€”OCH2CH2OH; (ii) a compound of the formula: â€ƒwherein R3 is â€”OCOCH3 or â€”OCH2CH2OH (iii) a compound of the formula: â€ƒand (iv) a mixture thereof.