Abstract: The invention relates to a process for the synthesis of a polyisocyanate composition comprising acylureas. According to the invention, a starting composition comprising a compound having at least two isocyanate functional groups is subjected to a reaction with at least two acid functional groups, with at least one of the acid functional groups having a pKa value of less than or equal to 3, and at least one of the acid functional groups having a pKa value of more than 3 and less than or equal to 6, at a temperature at least equal to 50 ° C., wherein the acid functional group having a pKa value of less than or equal to 3 and the acid functional group having a pKa value of more than 3 and less than or equal to 6 are present on two different acids or on the same acid.

Abstract: The invention relates to a method for the synthesis of a polyisocyanate composition comprising acylureas. According to the invention, an initial composition containing derivatives comprising at least two isocyanate functions is subjected to the action of at least two acids, whereby at least one of said acids is a strong acid (pKa=3) and at least one is a medium strength acid (3=pKa=6), at a temperature that is equal to or greater than 50° C.; the invention is suitable for coatings.

Abstract: The invention relates to a method for the synthesis of a polyisocyanate composition comprising acylureas. According to the invention, an initial composition containing derivatives comprising at least two isocyanate functions is subjected to the action of at least two acids, whereby at least one of said acids is a strong acid (pKa=3) and at least one is a medium strength acid (3=pKa=6), at a temperature that is equal to or greater than 50° C.; the invention is suitable for coatings.