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

摘要

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°, is in a range from 30% to 90%.