Basecoat composition comprising a poly(meth)acrylate binder

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 133/06 (2006.01) B05D 7/26 (2006.01) C08G 18/62 (2006.01) C08G 18/79 (2006.01) C09D 7/12 (2006.01) C09D 17/00 (2006.01) C09D 133/14 (2006.01) C09D 175/12 (2006.01)

Patent

CA 2440640

A refinish basecoat composition includes at least one pigment and an hydroxyl- functional acrylic polymer. The acrylic polymer has a number average molecular weight of at least about 6000 and is polymerized using at least about 45% by weight cycloaliphatic monomer, based on total monomer weight polymerized. A mixer system that can be used to prepare the refinish basecoat has a plurality of color components, each independently including at least one pigment dispersed by the hydroxyl-functional acrylic polymer, and a pigment-free component containing the hydroxyl-functional acrylic polymer.

Cette invention concerne une composition d'apprêt pour rénovation comprenant au moins un pigment et un polymère acrylique à fonction hydroxyle. Le polymère acrylique présente une masse moléculaire moyenne d'au moins 6000 environ et est polymérisé au moyen d'un monomère cyclo-aliphatique en quantité au moins approximativement équivalente à 45 % en poids du poids total de monomère polymérisé. Un système de mélange pouvant être utilisé pour préparer la couche d'apprêt de rénovation comporte une pluralité de composants chromatiques contenant chacun indépendamment au moins un pigment dispersé par le polymère acrylique à fonction hydroxyle, et un composant exempt de pigment renfermant le polymère acrylique à fonction hydroxyle.

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