Copolymerization of dicarboxylic acids and dialkyl esters of dic

Details Copolymerization of dicarboxylic acids and dialkyl esters of dic Copolymerization of dicarboxylic acids and dialkyl esters of dic

1993-03-22

1994-03-22

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528275, 528277, 528283, 528285, 528298, 528301, 528302, 528307, 528308, 5283086, C08G 6378

Patent

active

052965872

ABSTRACT:
The present invention relates to a process for copolymerizing a dicarboxylic acid, a dialkyl ester, and a diol in the presence of a transesterification catalyst. The process involves heating a mixture containing carboxylic acids and esters in excess diol at elevated temperatures in the presence of a transesterification catalyst and returning any vaporized diol to the reaction vessel until the theoretical amount of alcohol and/or water have been evolved. The alcohol and/or water of reaction is not allowed to return to the vessel. When the theoretical weight of alcohol and/or water is collected, the excess diol is removed and the polymerization is allowed to proceed.

REFERENCES:
patent: 4066624 (1978-01-01), Kawase et al.

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