Japan Synthetic Rubber Co., Ltd.

Osamu Kikuchi

Masayuki Hattori

Kiyoshi Kasai

Nobuo Sakurai

Teruo Hiraharu

Hiromi Takeuchi

Minoru Kato

Haruhiro Hirai

Kyoko Kadoya

An aqueous coating composition comprising 15 to 40% (as a solid) by weight of an aqueous copolymer latex. The aqueous copolymer latex is prepared by the emulsion polymerization of monomer components which comprises: (A) 10 to 70 parts by weight of a (meth)acrylate monomer comprising (A-1) 20 to 80% by weight of a branched C.sub.3-5 -alkyl (meth)acrylate and (A-2) 80 to 20% by weight of a linear C.sub.2-4 -alkyl (meth)acrylate; (B) 5 to 30 parts by weight of an ethylenically unsaturated carboxylic acid; and (C) 0 to 85 parts by weight of a monomer copolymerizable with said components (A) and (B). The composition exhibits strong resistance to neutralization, excellent durability, a superior leveling characteristic, superb adhesiveness, high resistance to water-permeation, and good water repellency. It is suitable for coating plastics, ceramics, woods, and formed concrete.

Aqueous coating composition

A process for preparing large-sized polymer particles having a particle diameter in a range of 0.1 to 500 .mu.m by seeded polymerization is described, comprising:

Process for preparing large-sized polymer particles

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Yokkaichi, Japan

Osamu Kikuchi