Sumitomo Chemical Company, Limited

Tomoaki Sata

Tatsuo Mitsutake

An aqueous emulsion having excellent water resistant property and comprising a copolymer obtainable by polymerizing ethylene and vinyl ester, and a nonionic polyoxyalkylene surface active agent, wherein the nonionic polyoxyalkylene surface active agent comprises 1 to 10 parts by weight of polyoxyalkylene alkyl ether and 0.01 part by weight or less of polyoxyalkylene phenyl ether based on 100 parts by weight of vinyl ester units in the copolymer is provided.

Aqueous emulsion comprising ethylene-vinylester copolymer

A method for producing an ethylene-vinyl acetate copolymer aqueous emulsion is provided which uses a redox catalyst comprising a transition metal salt and an erysorbic acid and/or an ascorbic acid, as the reducing agent thereof, and 1.8 to 10 mol of hydrogen peroxide, as an oxidizing agent thereof, per one mol of the erysorbic acid and the ascorbic acid, and by this method, an ethylene-vinyl acetate copolymer aqueous emulsion which causes no generation of formalin and in which discoloration is suppressed can be obtained.

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Toyonaka, Japan

Tomoaki Sata