Latex polymers for pigmented coatings prepared in the...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 4/02 (2006.01) C08F 2/44 (2006.01) C08L 33/06 (2006.01) C09D 4/06 (2006.01) C09D 133/06 (2006.01)

Patent

CA 2154718

The invention relates to an acrylic polymer latex comprising the polymerization product of an acetoacetate moiety of the structure Image wherein R1 and R2 are the same or different and are selected from the group consisting of C1-C22 alkyl groups and X is a halogen in amounts effective to improve the water resistance of the acrylic latex;and at least one monomer(s) selected from the group consisting of C3-C6 monocarboxylic acids C4-C6 dicarboxylic acids and their C1-C4 half esters C1-C10 alkyl esters of acrylic acid C1-C10 alkyl esters of methacrylic acid styrene halogenated styrene and substituted styrene and latex compositions containing the novel latexes. The invention also relates to methods of improving the water resistance of the coating compositions which include adding to the coating composition the latex which contains an amount of the acetoacetate moiety effective to improve the water resistance of the coating compositions.

Latex de polymère acrylique renfermant le produit de polymérisation d'une fraction acétoacétate de structure Image où R1 et R2 sont les mêmes ou différents, choisis parmi un ensemble constitué de groupes alkyles C1-C22; X est un halogène en quantités voulues pour améliorer la résistance du latex acrylique à l'eau; au moins un ou plusieurs monomères choisis dans l'ensemble constitué d'acides monocarboxyliques C3-C6, d'acides dicarboxyliques C4-C6 et leurs demi-esters C1-C4, d'esters d'alkyle C1-C10 d'acide acrylique, d'esters d'alkyle C1-C10 d'acide méthacrylique, de styrène, de styrène halogéné et de styrène substitué; compositions pour latex renfermant les nouveaux latex. L'invention porte également sur les méthodes permettant d'améliorer la résistance des compositions de revêtement à l'eau, ce qui comprend l'addition à cette composition du latex renfermant une quantité d'acétoacétate en quantité voulue pour améliorer la résistance des compositions de revêtement à l'eau.

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