Self-crosslinking aqueous polyurethane dispersions

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/83 (2006.01) C08G 18/28 (2006.01) C08G 18/66 (2006.01) C09D 175/06 (2006.01)

Patent

CA 2527038

The invention relates to self-crosslinking aqueous polyurethane dispersions containing a crosslinking agent I selected from diamines I1 and dihydrazides I2, and polyurethanes comprising structural elements derived from polyisocyanates A, polyols B having a number average molar mass Mn of at least 400 g/mol, compounds D comprising at least two groups which are reactive compared to isocyanate groups and at least one group able to form anions, low- molecular polyols E that carry no other reactive groups compared to isocyanate groups, compounds F containing at least one group which is reactive compared to isocyanate, and at least one aldehyde-type or ketone-type carbonyl group, and compounds G that are monofunctional compared to isocyanates or contain active hydrogen with different capabilities of reaction and are different from the compounds E. The invention also relates to methods for the production of said dispersions, and coating agents containing the same.

L'invention concerne des dispersions de polyuréthane aqueuses autoréticulantes contenant un agent de réticulation (I) sélectionné parmi les diamines Il et dihydrazides I2 et des polyuréthanes avec des modules dérivés de polyisocyanates A, de polyols B ayant une masse molaire moyenne M¿n ?d'au moins 400 g/mol, de composés D qui présentent au moins deux groupes réactifs par rapport au groupes d'isocyanate et au moins un groupe actif dans la formation d'anions, des polyols E à faible poids moléculaire qui ne portent aucun groupe réactif au groupes d'isocyanate, des composés F qui contiennent au moins un groupe réactif à l'isocyanate et au moins un groupe de carbonyle de type aldéhyde ou cétone, des composés G qui sont monofonctionnels par rapport aux isocyanates ou contiennent une réactivité différente à l'hydrogène actif et sont différents des composés E. L'invention concerne également leur procédé de production et les agents de revêtement contenant ces dispersions.

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