A PROCESS OF PREPARING POLY
Application IN/PCT/2002/00060/MUM published 2006-09-15, filed 2001-01-17
A process of preparing poly (trimethylene terephthalate) containing less than 2.0 mole % of DPG comprising: (a) providing a molar amount of 1,3-propanediol: C1 to C4 dialkyl ester of terephthalic acid of 1.2:1 to 1.9:1, (b) reacting the 1,3-propanediol with the C1 to C4 dialkyl ester of terephthalic acid to form bis (3-hydroxypropyl) terephthalate monomer in the presence of 10-100ppm (as titanium metal) of an organic titanate catalyst, by weight of the poly (trimethylene terephthalate), and (c) polymerizing the bis(3-hydroxypropyl)terephthalate monomer to obtain the poly(trimethylene terephthalate); and poly(trimethylene terephthalate) produced by the process. Drawing: NIL Total Pages: 18 (FIG.-NIL)
Applicant
E.I.DU PONT DE NEMOURS AND COMPANY
WILMINGTON, DELWARE, UNITED STATES OF AMERICA
Inventor
1. YUANFENG LIANG 2. JOSEPH VARAPADVIL KURIAN
International Info
Classification: C08G 63/85, 63/183, 63/78
Publication Number: WO 01/14450
Priority Information
60/150 U.S.A. 1999-08-25