07.03.17
US Patent No. 9,663,676 B2; Kao Corporation, Tokyo, has patented a process for producing a fine organic pigment. It entails: kneading a mixture prepared by blending (A) a raw material organic pigment comprising an oxygen atom and a nitrogen atom bonded to a hydrogen atom in a molecule thereof, (B) a water-soluble inorganic salt, (C) a water-soluble organic solvent, (D) water and (E) a water-soluble basic compound with each other, the water (D) being blended in an amount of not less than 0.6 part by mass and not more than 7.0 parts by mass on the basis of 100 parts by mass of the water-soluble inorganic salt, and the water-soluble basic compound (E) being blended in an amount of not less than 1.5 parts by mass and not more than 35 parts by mass on the basis of 100 parts by mass of the raw material organic pigment.
