Aqueous two-component polyurethane coating composition,...

C - Chemistry – Metallurgy – 09 – D

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C09D 175/04 (2006.01) B05D 1/36 (2006.01) C08F 8/30 (2006.01) C08G 18/08 (2006.01) C08G 18/62 (2006.01) C09D 133/04 (2006.01) C09D 133/06 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2165088

The present invention relates to an aqueous two-component polyurethane coating composition comprising A) a water-dilutable polyacrylate resin (A) having an OH number of from 40 to 200 mg of KOH/g, an acid number of from 20 to 100 mg of KOH/g and a glass transition temperature of from -40°C to +60°C, and B) a polyisocyanate component as crosslinking agent, characterized in that the water-dilutable acrylate resin is obtainable by solution polymerization, in the presence of a polymerization initiator, of at least one monomer which is free of carboxyl groups, at least one monomer which contains hydroxyl groups, at least one vinyl ester of .alpha.-branched monocarboxylic acids having 5 to 18 carbon atoms per molecule and/or at least one reaction product of acrylic acid and/or methacrylic acid with the glycidyl ester of .alpha.-branched monocarboxylic acids having 5 to 18 carbon atoms per molecule, -54- at least one monomer containing carboxyl groups and, if desired, other monomers which are essentially free of carboxyl groups, and after the end of the polymerization the resulting polyacrylate resin is at least partially neutralized and is dispersed in water.

Un enduit aqueux à base de polyuréthanne à deux composants contient (A) une résine de polyacrylate (A) diluable dans l'eau avec un indice hydroxyle compris entre 40 et 200 mg KOH/g, un indice d'acidité compris entre 20 et 100 mg KOH/g et une température de transition vitreuse comprise entre -40 DEG C et +60 DEG C; et (B) un composant polyisocyanate comme agent réticulant. L'enduit se caractérise en ce que l'on prépare la résine d'acrylate diluable dans l'eau par polymérisation en solution en présence d'un initiateur de la polymérisation d'au moins un monomère exempt de groupes carboxyle, d'au moins un monomère contenant des groupes hydroxyles, d'au moins un ester de vinyle d'acides monocarboxyliques ramifiés en alpha ayant 5 à 18 atomes de carbone par molécule et/ou d'au moins un produit de la réaction de l'acide acrylique et/ou méthacrylique avec l'ester de glycidyle d'acides monocarboxyliques ramifiés en alpha ayant 5 à 18 atomes de carbone par molécule, d'au moins un monomère contenant des groupes carboxyle et le cas échéant d'autres monomères sensiblement exempts de groupes carboxyle. Une fois la polymérisation achevée, la résine de polyacrylate ainsi obtenue est au moins partiellement neutralisée et dispersée dans l'eau.

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