Sakata Inx Corporation

Sakata Ink Corp.

Kazunori Itoh

Takaaki Yodo

Masanori Kano

Hideo Shibata

Naoyuki Kitaoka

A pigment dispersion composition which can be suitably applied in such fields as color filters, black matrices and ink jet recording where it is necessary to finely disperse pigments still with retention of good dispersion stability and temporal stability even when the total amount a pigment derivative, pigment intermediate, colorant derivative and colorant intermediate, and/or a pigment dispersant is small. Another object is a pigment dispersion-based resist composition which can give color filters high in permeability, excellent in contrast and causing no bleeding or black matrices high in light-shielding and insulating properties, and causing no bleeding. And a pigment dispersion composition which is prepared by dispersing a pigment using a pigment derivative, pigment intermediate, colorant derivative and/or colorant intermediate each having a functional group reactive with a carbodiimide group and having adsorption ability on the pigment surface, and a carbodiimide compound containing at least one carbodiimide group.

Pigment dispersion composition, use thereof and compound for pigment treatment

A treated pigment and a dispersion composition thereof having preferable dispersion stability and fluidity in a dispersion medium even the pigment has no functional group reactive with a carbodiimide group on the surface thereof, and further to provide a resist composition exerting very excellent developing characteristics when forming color filters, black matrices and the like patterns. Furthermore, the invention also provides a compound for pigment treatment suited for the treatment of such pigment. A treated pigment which is producible by the treatment with a carbodiimide-based compound having at least one side chain selected from the group consisting of polyester side chains, polyether side chains and polyacrylic side chains and at least one basic nitrogen-containing group within the molecule.

Treated pigment, use thereof, and compound for pigment treatment

The present invention provides a treated pigment produced by treating at least one pigment selected from the group consisting of organic pigments and carbon black each having a functional group reactive with a carbodiimide group with a carbodiimide compound having one or more carbodiimide groups, said carbodiimide compound having, within the molecule thereof, at least one side chain selected from the group consisting of polyester side chains, polyether side chains and polyacrylic side chains, with a carbodiimide equivalent of 100 to 50,000.

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Osaka, Japan

Kazunori Itoh