Process for the production of oligomeric polyisocyanates and the

Details Process for the production of oligomeric polyisocyanates and the Process for the production of oligomeric polyisocyanates and the

1985-08-14

1986-09-30

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...

540202, 528 67, 528 73, 544193, C08G 1880

Patent

active

046147853

ABSTRACT:
The present invention relates to a process for the production of oligomeric polyisocyanates by the dimerization or trimerization of a portion of the isocyanate groups in organic polyisocyanates in the presence of tertiary phosphines or in the presence of a peralkylated phosphorus acid triamides as catalyst, followed by termination of the dimerization and/or trimerization reaction at the required degree of oligomerization by the addition of a catalyst poison, characterized in that a sulfonyl isocyanate is used as the catalyst poison.
The present invention also relates to the use of the oligomeric polyisocyanates obtained by this process, optionally in admixture with unreacted starting polyisocyanate or optionally blocked by blocking agents for isocyanate groups, as the polyisocyanate component in the production of polyurethane plastics.

REFERENCES:
patent: 3290288 (1966-12-01), Oertel et al.
patent: 3645979 (1972-02-01), Liebsch et al.
patent: 4113945 (1978-09-01), Kauffman
patent: 4388245 (1983-06-01), Ueyanagi et al.
patent: 4476054 (1984-10-01), Disteldorf
patent: 4520186 (1985-05-01), Hess et al.
A. Darkas and G. A. Mills, Adv. Catal. 13, (1962), pp. 393 et seq.

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