Use of an acrylic dispersing agent - associative thickener...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/02 (2006.01) B01F 17/00 (2006.01) C09D 7/00 (2006.01) C09D 7/02 (2006.01) C09D 7/12 (2006.01) C09D 167/08 (2006.01)

Patent

CA 2720207

The invention relates to the use, in an aqueous-phase alkyd resin formulation, of a dispersant/thickener pairing: the dispersant is a copolymer of (meth)acrylic acid with an alkoxylated monomer possessing a polymerizable function and terminated by hydrogen or an alkyl group having 1 to 4 carbon atoms, and the thickener is an associative thickener containing at least one hydrophobic group which is a polystyrylphenyl, preferably selected from distyrylphenyl, tristyrylphenyl and mixtures thereof, and which very preferably is tristyrylphenyl. This combination makes it possible to enhance the gloss retention of the paint film over time, while providing the aqueous formulation with the desired rheology.

L'invention consiste en l'utilisation, dans une formulation de résine alkyde en phase aqueuse, d'un couple dispersant / épaississant : le dispersant étant un copolymère de l'acide (méth)acrylique avec un monomère oxyalkylé possédant une fonction polymérisable et terminé par l'hydrogène ou un groupement alkyle ayant de 1 à 4 atomes de carbone, - l'épaississant étant un épaississant associatif contenant au moins un groupement hydrophobe qui est un polystyrylphényle, préférentiellement choisi parmi le distyrylphényle, le tristyrylphényle et leurs mélanges, et qui est très préférentiellement le tristyrylphényle. Cette combinaison permet d'améliorer la rétention du niveau de brillant du film de peinture au cours du temps, tout en assurant à la formulation aqueuse la rhéologie souhaitée.

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