Mitsubishi Kasei Corporation

Mitsubishi Chemical Industries Limited

Yasuo Kamoshita

Yukio Yamaguchi

Hiromi Horiuchi

Toshihiko Yoshitomi

Kiyoshi Sekihara

Heihachi Yushina

Yukihiro Sato

Hirofumi Oda

An electrophotographic yellow toner comprising binder resins having dispersed therein acetoacetanilide type monoazo pigments in its amorphous phase. The toner is excellent in transparency and spectral reflection characteristics. The toner is prepared by a process comprising a step of subjecting a colorant containing acetoacetanilide monoazo pigments and binder resins to heat treatment at a temperature higher than the softening point of the binder resin by at least 40.degree. C.

Electrophotographic yellow toner and process for producing the same

An insulative magnetic toner disclosed herein comprises a magnetic powder, a negative charge control agent, a binder resin and a compound having phenazine ring amorphous-silicon photoreceptor. The magnetic toner according to the invention is effective for preventing the occurrence of picture image blurring under high humidity when used in an amorphous-silicon photoreceptor.

Magnetic toner for electrophotography

An amorphous silicon photoreceptor for electrophotography having a specific surface roughness is disclosed herein. Also provided are a process for the preparation and/or regeneration of the material and improved methods for electrophotography, which use a special abrasive. The material enables the electrophotography without occurance of any image blurring under high humidity conditions.

Amorphous silicon hydride photoreceptors for electrophotography, process

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Yokohama, Japan

Yasuo Kamoshita