Ethylene Oxide → Urethane acrylate

Participants

Reaction Steps

To a reaction vessel equipped with a stirrer, 233.1 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 was added. To this, 250.6 gm of 2-hydroxyethylacrylate was added while controlling the temperature to 20° C. or less. After the addition was completed the mixture was continuously stirred for an additional one hour at 10° to 20° C. Following this, 516.8 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-4] of a number of average molecular weight of about 1,850 was obtained.

Provenance & Evidence