Process for the preparation of polyisocyanates containing uretdi

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

1989-12-22

1991-02-19

Kight, III, John

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...

528 67, 528 38, 521108, C08G 1838

Patent

active

049945416

ABSTRACT:
The present invention is directed to a process for the preparation of modified polyisocyanates containing uretdione and isocyanurate groups by the oligomerization of a portion of the isocyanate groups of organic diisocyanates containing (cyclo)aliphatically-bound isocyanate groups in the presence of organic phosphines of catalysts followed by termination of the oligomerization reaction at the desired degree of oligomerization by the addition of a catalyst poison and removal, by distillation, of at least a portion of the excess, unreacted starting diisocyanate, characterized in that

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patent: 4614785 (1986-09-01), Richter et al.
patent: 4623672 (1986-11-01), Kleinstuck et al.
patent: 4668780 (1987-05-01), Disteldorf et al.

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