Ethylene Glycol → Dimethyl terephthalate

Participants

Reaction Steps

A polyester produced in known manner from 353 g of dimethyl terephthalate, 153 g of ethylene glycol and 88 g glycerin is heated to 80° C. with the addition of 52 g of cresol. After the further addition of 200 g of trimellitic acid anhydride and 103 g of 4,4'-diaminodiphenylmethane the reaction mixture is further heated, whereby at a temperature of 140° C. the diimidodicarboxylic acid of Example A separates. After further temperature increase esterification occurs at 215° C., until the resin becomes clear. After the addition of 350 g of technical cresol the mixture is cooled to 80° C.

Provenance & Evidence