Ethylene Glycol → Dimethyl terephthalate

Participants

Reaction Steps

A polyester is produced in known manner from 388 g of dimethyl terephthalate, 112 g of ethylene glycol and 75 g of glycerin and this polyester is mixed in two portions with 137 g of the reaction product of Example A at a temperature of 180°-215° C. After the diimidedicarboxylic acid (reaction product as Example A) has been completely taken up in the terephthalic acid resin, 1.8 g of cadmium acetate is added thereto. The reaction mixture is subsequently further condensed for 3 hours at 215° C., finally under vacuum. The thus obtained resin is dissolved in 450 g of technical cresol while still hot and this solution is reacted with a solution of 9 g of butyl titanate in 27 g of cresol.

Provenance & Evidence