Ethylene Oxide → Urethane acrylate

Participants

Reaction Steps

Into a reaction vessel equipped with a stirrer, 168.2 gm of isophorone diisocyanate, 1,044.6 gm of copolymer of ethylene oxide, 1,2-butylene oxide, and bisphenol A (1:7:1 by weight) with a number average molecular weight of 2,052, and 0.3 gm of 2,6-di-tert-butyl-4-methyl phenol, as a polymerization inhibitor, were charged. After cooling the mixture to 15° C. in an ice-cooled bath, 1 gm of dibutyltindilaurate was added to initiate the reaction at 30 to 40° C. for 2 hours. After the addition of 47.2 gm of hydroxyethyl acrylate, the mixture was stirred for 5 hours at a temperature of 50° to 60° C. to obtain urethane acrylate [A-2] with a number average molecular weight of 6,140.

Provenance & Evidence