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

1989-12-26

1991-08-20

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 57, 521 59, 521 64, C08J 928, C08J 922, C08J 916

Patent

active

050414640

ABSTRACT:
A process for preparing polymer emulsion particles having pores therein, an outside diameter D of 0.1 to 5.0[ , an inside diameter d of 0.05 to 4.0.mu. , 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 hydrolyzing 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.degree. to 100.degree. C. The particles when use as a pigment in coating compositions provide excellent converage rate, brightness, gloss and water resistance.

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patent: 4863973 (1989-09-01), Chip et al.
patent: 4908392 (1990-03-01), Kusano et al.
patent: 4920160 (1990-04-01), Chip et al.

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