Process for the preparation of polyisocyanates containing isocya

Details Process for the preparation of polyisocyanates containing isocya Process for the preparation of polyisocyanates containing isocya

1982-01-06

1983-04-12

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

544193, 544222, C08G 1877

Patent

active

043799051

ABSTRACT:
The subject of the invention is a process for the preparation of polyisocyanates containing isocyanurate groups which comprises trimerizing a proportion of the isocyanate groups of organic polyisocyanates or mixtures of di- and monoisocyanates in the presence of basic alkali metal compounds as catalysts and terminating the trimerization reaction by the addition of a catalyst poison, characterized in that the trimerization catalysts are complexes of

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J. E. Kresta, R. J. Chang, S. Kathiriya and K. C. Frisch, Makromol. Chem. 180, pp. 1081 et seq (1979).

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