Patent ID: 8022200

Claim:
A process for the preparation of organic isocyanates containing carbodiimide and/or uretonimine groups, comprising: (1) partially carbodiimidizing isocyanate groups of an organic isocyanate in the presence of one or more phospholine oxide catalysts, (2) subsequently terminating the carbodiimidization reaction by the addition of a silylated acid which corresponds to the formula: X—[Si(CH 3 ) 3 ] n , wherein: X represents the neutral acid radical which is obtained from an n-basic acid having a pKa value of not more than 3 by removal of the acid hydrogen atoms, with the proviso that said n-basic acids exclude hydrogen halide acids, and n represents an integer from 1 to 3, and (3) adding a compound selected from the group consisting of non-silylated acids, acid derivatives of non-silylated acids, acid chlorides, sulfonic acid esters and mixtures thereof.