Aisin Kako Kabushiki Kaisha

Tetsuo Gotou

Takayoshi Takahira

Toshihiro Iwase

In a water-based coating material, to be able to obtain a tough film having an excellent corrosion resistance even if an additive amount of zinc oxide particles is reduced less than that of conventional ones and obtain a tougher film having a much excellent corrosion resistance by coupling a great amount of carboxyl groups to a surface of zinc oxide particles when making the additive amount of zinc oxide particles equal to that of conventional ones. Each of evaluation items covering hardness, adhesion, corrosion resistance, water resistance of a film being formed by applying a water-based coating material, and storage stability of the water-based coating material, which was manufactured using zinc oxide particles having a great amount of asperities on a surface and a large specific surface area produced by comprising the steps of mixing a water-soluble zinc material and an alkali material to react, and then performing water washing so as to remove impurities in a product, dehydrating, drying, burning, and pulverizing to classify it, is greater than those of the conventional water-based coating material manufactured using zinc oxide particles having a normal specific surface area.

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Ichinomiya, Japan

Tetsuo Gotou