Nippon Shokubai Kagaku Kogyo Co., Ltd.

Nippon Shokubai Co., Ltd.

Keiichi Uehara

Mitsuo Kushino

Yoshikuni Mori

Hayato Ikeda

Yoshinori Sano

Nobuaki Urashima

Masuji Izubayashi

Yoshinobu Asako

Tatsuhito Matsuda

Nobuyuki Ando

Hironobu Toribuchi

Kazuhiro Anan

Carbon black graft polymer, method for production thereof, and use

Coloring fine particles produced by heating spheroidal coloring fine particles with an average fine particle diameter of 1-100 .mu.m obtained by suspension polymerization to a temperature of 30.degree. to 200.degree. C., thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to substantially the same average particle diameter of the spheroidal coloring particles before melting, and a toner for developing electrostatic images using the same.

Coloring fine particles and toner for developing electrostatic images

Coloring fine particles produced by heating spheroidal coloring fine particles with an average fine particle diameter of 1-100 .mu.m obtained by suspension polymerization to a temperature of 30.degree. to 200.degree. C., thereby causing the particles to fuse together in a block without completely destroying the particle interfaces, and then crushing the block to substantially the same average particle diameter of the spheroidal coloring particle before melting, and a toner for developing electrostatic images using the same.

Coloring fine particle and toner for developing electrostatic images

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Suita, Japan

Keiichi Uehara