Patent ID: 6084055
Filing Date: 2000-07-04
Classification: C08G

Abstract:
A method for preparing a poly(1,4-cyclohexanedicarboxylate) by the reaction of at least one relatively non-volatile diol with a 1,4-cyclohexanedicarboxylic acid ester in the presence of a transesterification catalyst, said method employing at least one of the following options:(I) conducting said reaction at a series of progressively increasing temperatures below 265.degree. C., with a residence time in the range of 40-120 minutes at temperatures above 250.degree. C.;(II) conducting an initial stage of said reaction in the presence of at least one C.sub.2-6 aliphatic diol in the amount of about 3-25 mole percent based on said 1,4-cyclohexanedicarboxylic acid ester.