Toluene 2,4-Diisocyanate → Urethane acrylate

Participants

Reaction Steps

To a reaction vessel equipped with a stirrer, 104.3 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, 856.0 gm of polytetramethylene glycol of a number average molecular weight of 2,000 (commercial product PTG2000 manufactured by Hodogaya Chemical) was added while maintaining the temperature in the 40° to 50° C. range, and reacted for 2 hours. Next, 2-hydroxyethylacrylate was added, after which the mixture was continuously stirred for 5 hours at 50° to 60° C. to complete the reaction. A urethane acrylate [B-2] of a number of average molecular weight of about 5,840 was obtained.

Provenance & Evidence