Novel cocatalyst system for trimerizing polyisocyanates

Claim 1

In a process for the preparation of a cellular polymer in which the major recurring polymer unit is isocyanurate which process comprises bringing together in the presence of a blowing agent, a polyisocyanate, a trimerization catalyst, and from about 0.01 equivalent to about 0.3 equivalent of a polyol per equivalent of isocyanate, the improvement which consists essentially of employing as the catalyst, a combination of the following ingredients: a. from 0.00075 to 0.03 equivalent per equivalent of said polyisocyanate of an amide salt having the formula ##STR12## wherein M is an alkali metal, R 1 , R 2 and R 3 can be the same or different and are selected from the group consisting of H, lower alkyl, aryl, aralkyl, and cycloalkyl, and R 4 is selected from the group consisting of lower alkyl and aryl; and b. from 0.0015 to 0.025 equivalent per equivalent of said polyisocyanate of a glycine salt having the formula ##STR13## wherein M is an alkali metal, R 5 is selected from the class consisting of hydrogen and alkyl having from 1 to 12 carbon atoms, inclusive, R 6 is selected from the class consisting of hydrogen, alkyl having from 1 to 12 carbon atoms, inclusive and --CH 2 --COO -M + , and R 7 is selected from the class consisting of hydrogen and the group ##STR14## .