Polyisocyanates containing acylurea groups, a process for...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 275/46 (2006.01) C08G 18/22 (2006.01) C08G 18/34 (2006.01) C08G 18/78 (2006.01)

Patent

CA 2373887

The present invention relates to a process for preparing polyisocyanates containing acylurea groups by reacting isocyanates corresponding to formula (I) R-(NCO)n (I), wherein R represents an n-valent linear or branched aliphatic group or cycloaliphatic group having 4 to 30 carbon atoms or an aromatic group having 6 to 24 carbon atoms and n is 1, 2, 3 or 4, with aliphatic and/or aromatic carboxylic acids in the presence of a metal salt catalyst at a temperature of 20 to 220°C. The present invention also relates to the reaction products (polyisocyanates) prepared by this process and to their use as binders for polyurethane coating compositions.

La présente invention a trait à un procédé de préparation de polyisocyanates comptant des groupements acylurée, cela en faisant réagir des isocyanates de formule (I) R-(NCO)n (I), où R représente un groupement aliphatique n-valent linéaire ou ramifié ou un groupement cycloaliphatique comptant 4 à 30 atomes de carbone ou un groupement aromatique comptant 6 à 24 atomes de carbone, et où n = 1, 2, 3 ou 4, avec des acides carboxyliques aliphatiques et/ou aromatiques en présent d'un sel métallique catalyseur, à une température de 20 à 220 degrés Celsius. La présente invention concerne également les produits de réaction (polyisocyanates) préparés grâce à ce procédé et leur utilisation comme liants dans des revêtements de polyuréthane.

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