C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 229/00 (2006.01) C07D 251/34 (2006.01) C08G 18/70 (2006.01) C08G 18/79 (2006.01)
Patent
CA 2071070
The present invention relates to a process for the preparation of oligomeric polyisocyanates in which (a) a portion of the isocyanate groups of organic poly- isocyanates is oligomerized in the presence of catalysts that accelerate the dimerization of isocyanate groups, and (b) the oligomerization reaction is terminated after reaction of about 5 to about 45% of the isocyanate groups present in said organic polyisocyanates by the addition of a catalyst poison comprising a silylated acid corresponding to the formula X-[Si(CN3)3]n wherein X represents the neutral acid residue obtained by removal of the acidic hydrogen atoms from an n-basic acid having a pK a value of at most 3, other than a hydrohalic acid, and n is an integer of 1 to 3. The invention also relates to the use of oligomeric polyiso- cyanates obtained by this process, optionally in admixture with unreacted starting polyisocyanates and/or optionally with the isocyanate groups blocked by blocking agents, as polyisocyanate component for the preparation of polyurethane resins by the isocyanate polyaddition process.
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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