Carboxy resin crosslinkers

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 175/04 (2006.01) C09D 201/02 (2006.01) C08G 18/34 (2006.01) C08G 18/38 (2006.01)

Patent

CA 2445210

Carboxy resins of low equivalent weight per carboxyl group are synthesized by reacting a compound having two or more isocyanate groups with a compound having one hydroxyl group and two or more carboxyl groups. In a preferred embodiment, the compound having isocyanate groups is an isocyanurate derivative of a diisocyanate. The compound having isocyanate groups and the compound having one hydroxyl group and two or more carboxyl groups are reacted under conditions where reaction of carboxyl groups with isocyanate is substantially avoided. In another aspect of the invention, coating compositions are provided that contain in addition to the carboxy resin, a second component having a number of functional groups that are reactive with the carboxyl groups on the carboxy resin.

L'invention concerne des résines carboxy de faible poids équivalent par groupe carboxyle, synthétisées par mise en réaction d'un composé comprenant deux ou plusieurs groupes isocyanate avec un composé comprenant un groupe hydroxyle et deux ou plusieurs groupes carboxyle. Dans un mode de réalisation préféré, le composé comprenant des groupes isocyanate est un dérivé isocyanurate d'un diisocyanate. Le composé comprenant des groupes isocyanate et le composé comprenant un groupe hydroxyle et deux ou plusieurs groupes carboxyle sont mis en réaction dans des conditions dans lesquelles la réaction des groupes carboxyle avec l'isocyanate est sensiblement évitée. Un autre aspect de l'invention concerne des compositions de revêtement contenant, en plus de la résine carboxy, un second composant comprenant un certain nombre de groupes fonctionnels réagissant avec les groupes carboxyle sur la résine carboxy.

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