Dai Nippon Toryo Co., Ltd.

Toagosei Chemical Industry, Co., Ltd.

Masayoshi Okubo

Yoshio Mori

Kazuyoshi Tsuneta

Hiroharu Sasaki

Kishiro Azuma

Shinya Sakaguchi

Atsushi Takamatsu

Resin composition for aqueous paint

A process for producing an aqueous resin dispersion is disclosed, which comprises dissolving a macromonomer having a radical polymerizable group at the terminal thereof and an oil-soluble radical polymerization initiator in a hydrophobic vinyl monomer copolymerizable with the macromonomer to form a solution, emulsifying the solution in an aqueous medium in the presence of an emulsifying agent selected from (A) an alkali sulfosuccinate anionic surfactant and (B) a surfactant comprising from 2 to 98% by weight of (i) an alkali sulfonate anionic surfactant other than (A) or (ii) an alkali sulfuric ester anionic surfactant, and from 98 to 2% by weight of a nonionic surfactant having an HLB value of 10 or more, and copolymerizing the macromonomer and the vinyl monomer at an elevated temperature. The aqueous resin dispersion has a high content of a graft polymer with a reduced content of unreacted macromonomer.

Process for producing aqueous resin dispersion

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Hyogo, Japan

Masayoshi Okubo