Scorch-safe acceleration of urethane vulcanization of unsaturated rubbers

摘要

Improvements in scorch time of natural and synthetic rubber compositions in urethane crosslinking systems employing alkyl derivatives of dithiophosphoric acid as the scorch delay cure catalyst having the formula: <IMAGE> wherein R1 and R2 are alkyl having at least 12 carbon atoms, or connected together and forman alkylene group having at least 2 carbon atoms, and R3 is hydrogen or phenethyl.