Surface-treated organic pigment and process for the production thereof
AssigneeToyo Ink Manufacturing Co., Ltd.
InventorsToshiyuki Uemura, Tsukasa Iguchi, Sunao Satake, Hisashi Uraki, Yasuharu Iida
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Abstract
A surface-treated organic pigment excellent in initial dispersibility and long-term dispersion stability in water and an organic solvent and free from the coagulation of pigment particles, obtained by reacting a sulfonating agent with an organic pigment dispersed in a solvent in which the organic pigment is insoluble or sparingly soluble, and thereby introducing a sulfonic acid group to the surface of each particle of the organic pigment.
Claims12
A process for the production of a surface-treated organic pigment, which comprises reacting a sulfonating agent selected from sulfamic acid or pyridine sulfur trioxide complex with an organic pigment dispersed in sulfolane, and thereby introducing sulfonic acid groups to the surface of each particle of the organic pigment.
Dependencies are inferred from the claim text.