Toluene 2,4-Diisocyanate → Urethane acrylate

Participants

Reaction Steps

Into a reaction vessel equipped with a stirrer were charged 5.5 parts of tolylene diisocyanate, 42.0 parts of a ring-opening copolymer from tetrahydrofuran and 3-methyltetrahydrofuran, having a number average molecular weight of 2,000, and 0.01 part of 2,6-di-t-butyl-p-cresol, as a polymerization inhibitor. The mixture was cooled with ice to a temperature of below 10° C., while stirring. When the temperature was lower than 10° C., 0.04 part of dibutyltindilaurate was added and the mixture was stirred for 2 hours while controlling the temperature at 20-30° C. Then, after the addition of 2.2 parts of hydroxyethyl acrylate, the mixture was stirred for 4 hours at 50-60° C., until the amount of remaining isocyanate is 0.1% by weight or less. The Liquid urethane acrylate obtained in this manner is hereinafter referred to as UA-2.

Provenance & Evidence