Seiko Epson Corporation

Saori Yamaki

Tsuyoshi Sano

Takayoshi Kagata

Toshimi Fukui

Junko Nakamoto

Hideki Kawasaki

An ink composition includes a water resistant aluminum pigment and water. The water resistant aluminum pigment is formed of an aluminum pigment and a covering film that contains Si and is formed on the surface of the aluminum pigment. A 50% average particle diameter of a corresponding circle obtained by calculation from areas of X-Y plain surfaces of the aluminum pigment is in a range from 0.5 pm to 3 pm. The coverage ratio of the covering film on the surface of the aluminum pigment, calculated from presence ratios of C, O, Al, and Si detected by XPS measurement at an incident angle of 30&#xb0;, is in a range from 30% to 90%.

Water resistant aluminum pigment dispersion, aqueous ink composition containing the same, and method for manufacturing water resistant aluminum pigment dispersion

A water resistant aluminum pigment dispersion includes a water resistant aluminum pigment which is an aluminum pigment covered with a silica film, wherein the water resistant aluminum pigment is formed of an aluminum pigment having an average thickness from 5 nm to 30 nm and a covering film which contains Si and is formed on the surface of the aluminum pigment; and wherein the coverage ratio of the surface of the aluminum pigment by the covering film, calculated from the composition ratio of C, O, Al, and Si detected by XPS measurement at an incident angle of 30&#xb0;, is in a range from 30% to 90%.

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Kawasaki, Japan

Saori Yamaki