Toyo Ink Manufacturing Company

Tsutomu Hiroshima

Daisuke Fujiwara

Atsushi Yoda

Kazunori Shigemori

Atsushi Nakazato

Ken Yamazaki

Yasushi Ariyoshi

Tomoko Tachibana

A dispersing agent characterized in that said dispersing agent is prepared by reacting primary and/or secondary amino groups of an amine compound comprising a polyamine (C) with isocyanate groups of a urethane prepolymer (E) having two isocyanate groups in one terminal region, wherein said urethane prepolymer (E) has been prepared by reacting hydroxyl groups in a vinyl polymer (A) having two hydroxyl groups in one terminal region with isocyanate groups in diisocyanates (B), and in that an amine number of said dispersing agent is 1 to 100 mgKOH/g is disclosed. The dispersing agent of the present invention has excellent dispersibility, flowability, and storage stability when used in small quantities. A pigment-dispersed product can be prepared therefrom, independently of the kinds of binder resin or solvent used. Further, the present invention is suitable for offset ink, gravure ink, resist ink for a color filter, inkjet ink, coating composition, and colored resin composition.

Dispersing agent, and pigment composition, pigment-dispersed product and inkjet ink prepared therefrom

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Tokyo, Japan

Tsutomu Hiroshima