C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
402/159, 260/335
C07D 229/00 (2006.01) C07D 251/34 (2006.01) C08G 18/79 (2006.01)
Patent
CA 1257593
A PROCESS FOR THE PRODUCTION OF OLIGOMERIC POLYISOCYANATES AND THEIR USE IN THE PRODUCTION OF POLYURETHANE PLASTICS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the production of oligomeric polyisocyanates by the dimerization or trimerization of a portion of the iso- cyanate 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 tri- merization reaction at the required degree of oligo- merization by the addition of a catalyst poison, charac- terized 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 polyiso- cyanate component in the production of polyurethane plastics.
488551
Engbert Theodor
Kubitza Werner
Mennicken Gerhard
Muller Hanns P.
Richter Roland
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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