MANUFACTURE OF ISOCYANURATE GROUP-CONTAINING COMPOUNDS BY CATALYTIC RING CLOSURE TRIMERIZATION OF ISOCYANATE WITH AMINOSILYL GROUP-CONTAINING COMPOUNDS AND ISOCYANURIC ACID ESTERS OBTAINED THEREBY

摘要

Monomeric or polymeric cpds. contg. isocyanurate gps. are prepd. by cyclotrimerisation of isocyanates in which the NCO gp. is not linked directly to a C atom forming part of an aromatic gp. Reaction is in presence of an aminosilyl catalyst of formula R(4-n)-Si-(NR'R")n, where R is a monovalent (un)satd. (cyclo)aliphatic, or aryl, aralkyl or alkalry hydrocarbon gp., opt. substd. by halogen or CN, or 2 R gps. may form a divalent hydrocarbon gp.; R' is R, SiR3, or -CO-N(R)-R", in which R"' is R or SiR3, or if R' is not an amide or SiR3 gp., it may form a divalent hydrocarbon gp. with R"; R" has the same meaning as R, or may be H if R' is not amide; and n=1 or 2; when n=2, R' is an R gp. Reaction is at moderate temp. and has no induction period. The catalyst is easily deactivated. Prods. obtd. from, e.g. hexamethylene diisocyanate, can be used in paints and varnishes.