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 ...

Toshiyuki Uemura, Tsukasa Iguchi, Mikiya Kato, Akimitsu Mochizuki: Self-dispersible aqueous pigment dispersion. Toyo Ink Mfg, Oblon Spivak McClelland Maier & Neustadt P C, September 17, 2002: US06451103 (24 worldwide citation)

There is disclosed a self-dispersible aqueous pigment dispersion and preparing method thereof, the dispersion comprising an aqueous solution, particles of a pigment and a water-soluble pigment derivative, said particles being dispersed in the aqueous pigment dispersion in a concentration within the ...

Click the thumbnails below to visualize the patent trend.