Process for the preparation of polyisocyanate.

摘要

Disclosed is a process for preparing isocyanurate-type polyisocyanates characterized by reacting an aliphatic or alicyclic diisocyanate compound comprising hexamethylene diisocyanate as a major component in the presence of an isocyanuration catalyst represented by general formula [I], <CHEM> wherein R<1>, R<2> and R<3> independently represent a hydrocarbon group containing 1 to 20 carbon atoms, or a hydrocarbon group containing one or more hetero atoms; at least two of R<1>, R<2> and R<3> may be linked to each other; R<4> indicates a hydrogen atom or a hydrocarbon group containing 1 to 20 carbon atoms; and R<5>, R<6> and R<7> independently represent a hydrocarbon group containing 1 to 20 carbon atoms. Diol-modified isocyanurate-type polyisocyanates can be prepared additionally using a hydrocarbon diol in the process.