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Toshiyuki Uemura, Tsukasa Iguchi, Sunao Satake, Hisashi Uraki, Yasuharu Iida: Surface-treated organic pigment and process for the production thereof. Toyo Ink Manufacturing, Wenderoth Lind & Ponack L, July 27, 1999: US05928419 (73 worldwide citation)

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 pi ...


2
Uemura Toshiyuki, Iguchi Tsukasa, Satake Sunao, Uraki Hisashi, Iida Yasuharu: Surface-treated organic pigment and process for the production thereof. Toyo Ink Mfg Co, April 8, 1998: EP0834537-A1 (18 worldwide citation)

An organic pigment in particulate form, wherein the interior of each pigment particle is substantially free of sulfonic acid groups and the surface of each pigment particle carries a sulfonic acid group.



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