Powder paint for multilayered painting

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/03 (2006.01) B05D 1/36 (2006.01) B05D 7/14 (2006.01) C08G 18/62 (2006.01) C08G 18/70 (2006.01) C09D 133/14 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2255611

The object of the present invention is a powder paint containing at least one hydroxyl group-containing binder and at least one cross-linking agent with free isocyanate groups dispersed in the binder in the form of discrete particles with diameters of between 0.1 of 150 micrometres, in which the binder is A1) at least one hydroxyl group-containing acrylate copolymer with a glass transition temperature of 30 to 80 ~C, a number average molecular weight of 2,000 to 15,000 daltons and an OH number of 60 to 180 mg KOH/g, where the hydroxyl groups of the acrylate copolymer consists of primarily bonded OH groups to the extent of over 50%, and/or A2) the reaction product of a carboxyl group-containing acrylates copolymer and an epoxide group-containing compound or the reaction product of an epoxide group-containing acrylate copolymer and a carboxyl group-containing compound, where the carboxy/epoxy reaction may take place before or during the reaction of the binder with the cross-linking agent.

L'invention concerne une peinture pulvérulente contenant au moins un liant comprenant des groupes hydroxyle et au moins un réticulant avec des groupes isocyanate libres, dispersé dans le liant sous forme de particules distinctes ayant des diamètres compris entre 0,1 et 150 microns. Cette peinture pulvérulente se caractérise en ce que le liant utilisé est A1) au moins un copolymérisat d'acrylate contenant des groupes hydroxyle et ayant une température de transition vitreuse comprise entre 30 et 80 ·C, un poids moléculaire moyen en nombre compris entre 2 000 et 15 000 daltons et un indice hydroxyle compris entre 60 et 180 mg KOH/g, les groupes hydroxyle du copolymérisat d'acrylate étant constitués pour plus de 50 % de groupes OH à liaison primaire, et/ou A2) le produit de réaction d'un copolymérisat d'acrylate contenant des groupes carboxyle et d'un composé contenant des groupes époxyde ou le produit de réaction d'un copolymérisat d'acrylate contenant des groupes époxyde et un composé contenant des groupes carboxyle, la réaction carboxy/époxy pouvant intervenir avant ou pendant la réaction du liant avec le réticulant.

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