Bando Chemical Industries, Inc.

Showa Denko K.k.

Mitsuhiro Uchino

Harushi Nagami

Katsumi Murofushi

Takashi Miki

Yoshikazu Hosoda

Yuki Abe

Kiyotaka Yamaguchi

Takayuki Yoshida

Jiro Yamashiro

Akira Yamauchi

Decolorizable toner and process for preparing the same

There is disclosed a method of producing a toner particles for use in electrophotography which comprises: suspending a radical polymerizable monomer which contains a colorant and a charge controlling agent therein in an aqueous phase; suspension polymerizing the monomer to provide spherical polymer particles of 1-30 .mu.m in diameter; treating the suspension containing the polymer particles with a continuous, wet type, agitation mill, to deform the polymer particles. A further method of producing toner particles is disclosed which comprises: producing spherical polymer particles by suspension polymerization of a monomer; making finely divided triboelectric or electroconductive particles or both onto the surface of the polymer particles; and then mechanically pressing the polymer particles to deform the polymer particles as well as to fix the particles on the surface of the polymer particles. A still further method of producing toner particles is disclosed which comprises: producing spherical polymer particles of 20-300 .mu.m in diameter by suspension polymerization of a monomer; and then crushing and classifying the polymer particles into toners of 1-30 .mu.m in size preferably after deforming the polymer particles.

Toners for use in electrophotography and production thereof

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Kobe, Japan

Mitsuhiro Uchino