Scratch resistant clearcoats containing surface reactive...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 7/12 (2006.01) B05D 1/36 (2006.01) C09D 201/02 (2006.01)

Patent

CA 2215425

The present invention is a coating composition having good scratch resistance and a method for improving the scratch resistance of a coating composition. The coating composition comprises (A) a film forming binder system containing a crosslinkable resin and optionally a crosslinking agent for the crosslinkable resin; (B) substantially colorless carbide or inorganic microparticles, range in size from about 1 to 1000 nanometers prior to incorporation in the coating composition, and the microparticles are reactive with the crosslinkable portion of the film forming binder system; (C) a solvent system for the crosslinkable resin, optional crosslinkable agent, and microparticles, wherein the crosslinkable resin is present in an amount from about 10 to about 80% by weight and the inorganic microparticles are present in an amount from 0.1 to 60.0 % by weight based on the sum of the weights of the crosslinkable resin, the optional crosslinking agent, and the inorganic microparticles.

L'invention porte sur une composition de revêtement résistant bien aux rayures et sur une méthode pour améliorer la résistance d'une composition de revêtement aux rayures. La composition renferme : A) un système liant formant une pellicule, contenant une résine réticulable et, facultativement, un réticulant; B) des microparticules minérales ou des carbures incolores, mesurant de 1 à 1000 nanomètres environ avant leur incorporation dans la composition de revêtement; les microparticules sont réactives avec la portion réticulable du système liant formant une pellicule; C) un système solvant pour la résine réticulable et, facultativement, un réticulant, ainsi que des microparticules; la résine réticulable représente environ 10 à 80 % en poids, et il y a de 0,1 à 60,0 % en poids de microparticules minérales, pourcentages basés sur la somme des poids de la résine réticulable, du réticulant facultatif et des microparticules minérales.

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