Toluene 2,4-Diisocyanate → Urethane acrylate

Participants

Reaction Conditions

Reaction Steps

An amount of toluene diisocyanate was added to a reaction vessel suspended in a room temperature water bath and stirred. The above product from Stage 1 was added incrementally to control exothermic activity. When the exothermic activity ceased the batch was heated to 82° C. and cooked for 1 hour. After the one hour cook the batch was cooled to 70° C. and polycaprolactone acrylate was added followed by an addition of hydroxyethylacrylate (HEA). A small amount of dibutyltindilaurate, a urethane catalyst, was also added to aid bringing the reaction to completion. The batch was cooked at 82° C. until no free isocyanate was detected by FTIR. The equivalent ratio of TDI:Stage 1 product:polycaprolactone acrylate:HEA was 2.0:1.0:0.5:0.5.

Provenance & Evidence