| http://www.w3.org/ns/prov#value | - anate represented by the formula (IV) ##STR14## wherein k is a integer of from 0 to 2, j and m are an integer of from 1 to 5, and h is an integer of from 0 to 2, in a mole ratio of from about 1:11 to 11:1 in the presence of a trimerization catalyst until trimerizing about 20 to 50% of initially present isocyanate groups; (ii) immediately adding a catalyst poison to terminate the trimerization reac
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