Ethylene Oxide → Urethane acrylate

Participants

Reaction Steps

In a reaction vessel equipped with a stirrer, 109.8 gm of 2,4-tolylene diisocyanate, 1 gm of dibutyltindilaurate, and 0.3 gm of 2,6-di-t-butyl-4-methylphenol as a polymerization inhibitor were added. To this, 48.8 gm of hydroxyethylacrylate was added while controlling the temperature to 20° C. or lower. After the addition was completed the mixture was continuously stirred for an additional one hour at 10° to 20° C. Following this, 841.4 gm of a copolymerized diol of ethylene oxide and 1,2-butylene oxide [ethylene oxide:1,2-butylene oxide 1:9 (by weight)] of a number average molecular weight of 2,000 was added while maintaining the temperature in the 40° to 50° C. range, after which the mixture was continuously stirred for 5 hours at 50° to 60° C. to complete the reaction. A urethane acrylate [A-I] of a number average molecular weight of about 4,750 was obtained.

Provenance & Evidence