Sodium Hydroxide → Benzimidazol-2-one

Participants

Reaction Steps

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.

Provenance & Evidence