Ethylene Glycol → Dimethyl terephthalate

Participants

Reaction Steps

A polyester produced in known manner from 388 g of dimethyl terephthalate, 112 g of ethylene glycol and 75 g of glycerin has 80 g of technical cresol added thereto and the mixture is heated to 80° C. 144 g of trimellitic acid anhydride and 74 g of 4,4'-diaminodiphenyl methane is then added to the resin melt and the temperature is slowly increased to 215° C. At 140° C. the resin melt becomes turbid and highly viscous, obviously due to the formation and separation of the diimidodicarboxylic acid of Example A.

Provenance & Evidence