Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Patent
1986-12-04
1989-06-06
Ford, John M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Four or more ring nitrogens in the bicyclo ring system
544221, 544222, 528 45, 528 51, 521107, 521108, C07D25134
Patent
active
048373214
ABSTRACT:
The present invention is directed to a process for the preparation of isocyanurate group-containing polyisocyanates by trimerizing a portion of the isocyanate groups of an organic polyisocyanate and terminating the trimerization reaction by the addition of a catalyst poison, characterized in that the trimerization catalyst used is a quaternary phosphonium salt of a tertiary phosphine and an alkylating ester of an acid of phosphorus. The present invention also relates to the use of the polyisocyanates obtained according to this process, optionally, in a form that has been freed from excess starting polyisoyanate and/or optionally blocked with blocking agents for isocyanate groups as the isocyanate component for the preparation of polyisocyanate polyaddition products, preferably polyurethanes.
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Chemical Abstracts, vol. 93, Sep. 1980, D. M. Yukhnovich et al., "Triarylisocyanurate", Abstract No. 132518e.
Kerimis Dimitrios
Muller Hanns P.
Bayer Aktiengesellschaft
Ford John M.
Gil Joseph C.
Harsh Gene
Roy Thomas W.
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