Dainichiseika Color & Chemicals Mfg. Co., Ltd.

Hideyuki Koiso

Naoyuki Sakai

Atsushi Nogami

Michiei Nakamura

Yoshiyuki Zama

Kenji Ogawa

Akio Yoshida

Hiroyuki Shimanaka

Shigeru Sakamoto

Dai Watanabe

Hisao Okamoto

Hiroaki Saikatsu

Masanori Takakamo

Yoshimasa Tsuchiya

Tohru Hosoda

Seishichi Sasaki

Michiel Nakamura

An aqueous pigment dispersion is produced by ultrafinely dispersing a pigment dispersion mixture, which has been obtained by mixing at least a pigment and a dispersant in an aqueous medium, with microbeads having diameters of not smaller than 0.02 mm but smaller than 0.2 mm. A color composition for a color filter is produced by dispersing a mixture of a pigment, a dispersant, a resin varnish and a solvent with the microbeads in a mill.

Water-based pigment dispersions, inkjet recording inks, and color filters

Image-recording, hydrophilic colorants having an organic pigment linked to a hydrophilic compound through a linking group and which are capable of forming images excellent in print quality such as chroma, gloss, density, light fastness and abrasion fastness, and also as hydrophilic colorants capable of affording inks excellent in physical properties such as long-term storability and press stability are described.

Hydrophilic coloring matter for recording image, aqueous coloring agent for recording image, method and device for recording image

A process produces a sulfonated solid particle by burning sulfur to yield gaseous sulfur dioxide, subjecting the gaseous sulfur dioxide to catalytic oxidation to yield gaseous sulfur trioxide, and sulfonating a dry powdery or granular solid particle with the gaseous sulfur trioxide in a gas phase-solid phase reaction.

Process for producing sulfonated solid particles

Growing community of inventors

Tokyo, Japan

Hideyuki Koiso