反应详情

130 g of the aqueous dispersion of the pigment derivative (a) and 30 g of deionized water were mixed with 20 g of C.I. pigment yellow 151 having an average primary particle diameter of 80 nm (in which the content of metal ions having a valence of at least 2 was 270 ppm), a 1% sodium hydroxide aqueous solution was added so as to adjust the pH of a mixture liquid to 9.0, and the mixture liquid was dispersed with a paint shaker in the presence of zirconia beads as media for approximately 5 hours, to obtain a water-based pigment dispersion. In the water-based pigment dispersion, the neutralizatior rate of the sulfonic acid group of the pigment derivative (a) was 80%. Further, the obtained water-based pigment dispersion was diluted so as to have a concentration of 3% by weight, and the diluted water-based pigment dispersion was dropped to NO.2 filter paper, to show no bleedings.

1. additionwas added so as
2. additionwas diluted so as
3. additionwas dropped to NO.2
4. filtrationfilter paper