Process for preparing polymer emulsion particles having pores

Details Process for preparing polymer emulsion particles having pores Process for preparing polymer emulsion particles having pores

C - Chemistry, Metallurgy

08

J

117/47.3

C08J 3/12 (2006.01) C08F 8/12 (2006.01) C08F 263/04 (2006.01) C08F 291/00 (2006.01) D21H 19/58 (2006.01) D21H 19/60 (2006.01)

Patent

CA 2006736

- 32 - Abstract: A process for preparing polymer emulsion parti- cles having pores therein, an outside diameter D of 0.1 to 5.0 µ, an inside diameter d of 0.05 to 4.0 µ, and a ratio (d/D) of 0.1 to 0.9 in dry condition, comprising the steps of forming core-shell emulsion particles from specific monomers by two-emulsion polymerizations, and swelling the core of the particles with water by hydro- lyzing the vinyl acetate part of polymer (A), thereby inducing the hydroxyl groups therein, e.g., using an acidic material or a basic material at 50 to 100°C. The particles when use as a pigment in coating compositions provide excellent converage rate, brightness, gloss and water resistance.

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