C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
402/132, 260/335
C07D 229/00 (2006.01) C08G 18/79 (2006.01)
Patent
CA 1155451
ABSTRACT OF THE DISCLOSURE The instant invention is directed to a process for the continuous preparation of polyisocyanates containing uret- dione groups comprising dimerizing aromatic polyisocyanates which are free from uretdione groups in the presence of catalysts which accelerate the dimerization of isocyanates, at -30 to 90°C in a self-cleaning, coolable screw reactor with continuous feeding in of the free polyisocyanate and of the dimerization catalyst, and in the presence of from 3 to 90% by weight, based on the whole mixture, of an additive containing hydroxyl groups, which additive comprises either (i) a compound within the molecular weight range of from 62 to 10,000 containing at least one hydroxyl group or (ii) a mixture of several compounds having an average molecular weight within the range of from 62 to 10,000 containing at least one bound hydroxyl group, wherein said hydroxyl-con- taining compound or compounds are added to the reaction mix- ture before the isocyanate used as starting material solidifies due to the dimerization reaction.
369502
Quiring Bernd
Rathjen Claus
Reischl Artur
Aktiengesellschaft Bayer
Marcoux & Sher Swabey Mitchell Houle
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