Toluene 2,4-Diisocyanate → Urethane acrylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

In a reaction vessel equipped with a stirrer were charged 228.1 g of 2,4-tolylene diisocyanate, 1699.8 g of a ring-opening copolymer of tetrahydrofuran and 3-methyltetrahydrofuran, having a number average molecular weight of 2,000, and 0.5 g of 2,6-di-t-butyl-methylphenol, as a polymerization inhibitor. After cooling the mixture to a temperature of below 10° C. in an ice water bath, 1.6 g of dibutyltindilaurate was added to initiate the reaction. The reaction was carried out for 2 hours while controlling the temperature at 20-35° C. Then, after the addition of 20.4 g of γ-mercaptopropyltrimethoxysilane, the mixture was stirred for a further one hour at 35-40° C., whereupon 89.3 of hydroxyethyl acrylate was added, followed by stirring for 5 hours at 40-60° C., to obtain liquid urethane acrylate (A-1) having a number average molecular weight of 4,750.

Herkunft & Nachweise