Coating compositions containing isocyanate-functional...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/08 (2006.01) C08G 18/62 (2006.01) C08G 18/63 (2006.01) C08G 18/72 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2449461

A coating composition containing about 40-90% by weight of film forming binder and 10-60% by weight of an organic liquid carrier; wherein the binder contains about (a) 10-70% by weight, based on the weight of the binder, of a dispersed gelled acrylic polymer having (i) a core of gelled polymerized ethylenically unsaturated monomers which is not soluble in the organic liquid carrier and having chemically grafted thereto (ii) substantially linear stabilizer polymeric components that are soluble in the organic liquid carrier and comprise polymerized ethylenically unsaturated monomers and have a weight average molecular weight of about 500-20,000 determined by GPC (gel permeation chromatography) using polystyrene as the standard; wherein the core, the stabilizer polymeric component, or both contain at least 3% by weight of polymerized ethylenically unsaturated monomers having isocyanate groups attached thereto that are capable of reacting with component (b); (b) 30-90% by weight, based on the weight of the binder, of an oligomer or polymer or both having functional groups capable of reacting with the isocyanate groups of component (a); and (c) 0-60% by weight, based on the weight of the binder, of an organic polyisocyanate crosslinking agent.

L'invention concerne une composition de revêtement contenant environ 40-90 % en poids d'un liant filmogène et 10-60 % en poids d'un support organique liquide, dans laquelle le liant contient environ (a) 10-70 % en poids, sur la base du poids du liant, d'un polymère acrylique gélifié dispersé comportant (i) un noyau de monomères à insaturation éthylénique polymérisés en gel insoluble dans le support organique liquide et contenant greffé chimiquement dessus (ii) des composants polymériques sensiblement linéaires de stabilisant solubles dans le support organique liquide et comprenant des monomères à insaturation éthylénique polymérisés et possédant un poids moléculaire moyen en poids d'environ 500-20,000 déterminé par CPG (chromatographie de perméation de gel) avec du polystyrène comme étalon, le noyau, le composant polymérique de stabilisant, où les deux à la fois, contenant au moins 3 % en poids de monomères à insaturation éthylénique polymérisés sur lesquels sont fixés des groupes isocyanate pouvant réagir avec le composant (b), (b) 30-90 % en poids, sur la base du poids du liant, d'un oligomère ou d'un polymère, ou des deux à la fois, possédant des groupes fonctionnels pouvant réagir avec les groupes isocyanates du composant (a), et (c) 0-60 % en poids, basé sur le poids du liant, d'un agent de réticulation de polyisocyanate organique.

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