Patent ID: 7595422

Claim:
A process for the at least partial elimination of trialkylphosphine oxides and optionally trialkyldihalophosphoranes from isocyanates or mixtures of isocyanates, comprising adding P 4 S 10 to isocyanates or mixtures of isocyanates which contain trialkylphosphine oxides and optionally trialkyldihalophosphoranes, and allowing the P 4 S 10 to react with the trialkylphosphine oxides and the trialkyldihalophosphoranes, thereby forming a proportional amount of trialkylphosphine sulfides, wherein the molar ratio of P 4 S 10 to the phosphorus of the phosphorus-containing compounds present in the isocyanate or mixture of isocyanates is from 0.1:1 to 1:1.