Preparation of biuret-containing polyisocyanates

C - Chemistry – Metallurgy – 07 – C

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C07C 275/62 (2006.01) C07C 265/14 (2006.01) C07C 273/18 (2006.01) C08G 18/78 (2006.01)

Patent

CA 2211025

A process for producing polyisocyanates containing one or more biuret groups, by reacting a) an aliphatic or cycloaliphatic isocyanate with several isocyanate groups (isocyanate a) with b) a tertiary alcohol or a mixture of water and a tertiary alcohol (biuretting agent b) at reaction temperature of 100 to 250°C, said process being characterized in that the reaction is conducted in the presence of c) a stabiliser (c) in which there are catalytic quantities of urea, ammonia, biuret, a urea derivative of the formula (I), in which R1, R2, R3 and R4 are hydrogen, C1-C10 alkyl or C5-C10 aryl, or a carbonic acid amide of formula (II) in which R5 is C1-C12 alkyl group, in which 1, 2 or 3 hydrogen atoms may be replaced by a (III) radical.

Procédé de fabrication de polysisocyanates contenant un ou plusieurs groupes biuret, consistant à faire réagir a) un isocyanate aliphatique ou cycloaliphatique à plusieurs groupes isocyanates (isocyanate a) avec b) un alcool tertiaire ou un mélange renfermant de l'eau et un alcool tertiaire (agent de biurettisation b), à des températures de réaction de 100 à 250 DEG C, ledit procédé étant caractérisé en ce qu'on effectue la réaction en présence c) d'un agent stabilisant (c) qui comprend, soit des quantités catalytiques d'urée, d'amoniac, de biuret, soit un dérivé de l'urée de formule (I), dans laquelle R<1>, R<2>, R<3> et R<4> désignent un hydrogène, un alkyle C1 à C10 ou un aryle C5 à C10, soit un amide d'acide carboxylique de formule (II), dans laquelle R<5> désigne un groupe alkyle C1 à C12 dans lequel, le cas échéant, 1, 2 ou 3 atomes d'hydrogène sont remplacés par un reste (III).

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