Patents

Kao’s Production Method for Fine Organic Pigments

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By: TOM BRANNA

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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...

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