Bando Chemical Industries, Inc.

Showa Denko K.k.

Harushi Nagami

Katsumi Murofushi

Takayuki Nagase

Yoshikazu Hosoda

Yuki Abe

Kiyotaka Yamaguchi

Takayuki Yoshida

Jiro Yamashiro

Mitsuhiro Uchino

Takashi Miki

Toshio Arai

Sadaharu Nakamura

Hiroshi Sanda

Toshio Kaji

Akira Yamauchi

An object of the present invention is to provide a liquid developing electrographic device roller suppressed in volumetric variation caused by a carrier. As a means for solving the problems, the present invention provides a liquid developing electrophotographic device roller including a shaft and an elastic material layer provided around the outer peripheral side of the shaft, wherein the elastic material layer is formed by using a polyurethane obtained by reacting a polyester polyol with a difunctional isocyanate.

Liquid developing electrophotographic device roller and liquid developing electrophotographic device

Decolorizable toner and process for preparing the same

A decolorizable toner including a resin binder, a near infrared ray-absorbing dye, a decolorizing agent and a light fastness stabilizer, and a process for preparing the decolorizable toner, which includes the steps of mixing the near infrared ray-absorbing dye and the light fastness stabilizer with the resin binder, and then mixing the decolorizing agent therewith. The decolorizable toner has excellent light stability during its production or storage and excellent decolorizing property.

Decolorizable toner

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

Growing community of inventors

Kobe, Japan

Harushi Nagami