Aqueous coating composition comprising an addition polymer...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 151/00 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2335757

The invention relates to an aqueous coating composition comprising a mixture of 90 to 99 wt.% of a film forming binder composition comprising an alkali non- swellable core-shell addition polymer dispersion (I), and 1-10 wt.% of a rheology modifying addition polymer dispersion (II). It is required that the total amount of (meth)acrylic acid in 100 parts of the total addition polymer (I) is less than 1.75 wt.%. The aqueous coating composition of the present invention can be advantageously used as a base coat in a base coat/clear coat system. This use shows a decrease in strike-in effect compared to previous known base coat/clear systems.

L'invention concerne une composition aqueuse de revêtement comprenant un mélange de 90 à 99 % en poids d'une composition de liant formant un film, laquelle contient une dispersion d'un polymère d'addition alcalin, à noyau et enveloppe, non expansible (I), et 1 à 10 % en poids d'une dispersion d'un polymère d'addition, modificateur de rhéologie (II). La quantité totale d'acide (méth)acrylique pour 100 parts du polymère d'addition (I) doit être inférieure à 1,75 % en poids. On peut avantageusement utiliser la composition aqueuse de revêtement de l'invention en tant que couche de fond dans un système couche de fond/couche transparente. L'utilisation de ce système démontre une capacité de diminution de l'effet "strike-in" (altération des qualités de la couche de fond par les solvants de la couche transparente), par rapport aux systèmes connus couche de fond/couche transparente.

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