Mita Industrial Co., Ltd.

Kyocera Mita Corporation

Akiyoshi Urano

Ichiro Yamazato

Mitsuo Ihara

Yumiko Sano

Yuji Tanaka

Eiichi Miyamoto

Fumio Sugai

Yukimasa Watanabe

Yasufumi Mizuta

Toshiyuki Fukami

Sakae Saito

Hirofumi Kawaguchi

Hideo Nakamori

Masato Katsukawa

Atsushi Fujii

Yuka Nakamura

Ayako Sugase

Seiji Kado

Kazushige Inoue

Hiroyuki Yamaji

The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1):

Electrophotosensitive material

The present invention provides a naphthoquinone derivative represented by the general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are as defined in the specification. An electrophotosensitive material containing this naphthoquinone derivative as an electron transferring material has high sensitivity.

Naphthoquinone derivative and electrophotosensitive material using same

Naphthoquinone derivative

The present invention provides an electrophotosensitive material comprising a conductive substrate and a photosensitive layer provided on the conductive substrate, the photosensitive layer comprising a specific hole transferring material and/or electron transferring material and a binding resin of a polyester resin which is a substantially linear polymer obtained by using a specific dihydroxy compound represented by the general formula (1): ##STR1## wherein R.sup.1 is an alkylene group having 2 to 4 carbon atoms; and R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are the same or different and indicate a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an aryl group or an aralkyl group or the like. This photosensitive material is improved in sensitivity, and is also superior in adhesion to conductive substrate as well as mechanical strength such as wear resistance, etc.

A black photoconductive toner having sensitivity to light in the wavelength range of semiconductor lasers, the toner containing a resinous binder, photoconductive material, a sensitizer, and a perylene black pigment or yellow, magenta, or cyan quinone dyes.

Black photoconductive toner having sensitivity to light in the

A photoconductive toner of the present invention contains a resin binder, zinc oxide, and a dye for sensitization of the zinc oxide, the sensitizer dye being represented by the following formula (1): ##STR1## wherein, X.sup.1 to X.sup.8 represent hydrogen or methoxy groups with a proviso that at least one of X.sup.1 to X.sup.8 represents a methoxy group, R.sup.1 and R.sup.2 are independently alkyl groups or derivatives thereof, and n is an integer. A photoconductive toner of the present invention satisfies requirements for both sensitivity and coloration, and, moreover, possesses high photosensitivity in the laser wavelength region as compared with conventional toners.

Photoconductive toner comprising a sensitizer dye

Disclosed is a photosensitive toner sensitive to light with wavelengths in the range of 600 to 700 nm, which includes zinc oxide, a sensitizing dye, and a resinous binder. The sensitizing dye is a cyanine dye which is represented by the following general formula (I): ##STR1## R is CH.sub.3, C.sub.2 H.sub.5, n-C.sub.4 H.sub.9, n-C.sub.7 H.sub.15, CH.sub.2 COOH, C.sub.2 H.sub.4 COOH or allyl, and X is I, Cl, Br, NO.sub.3 or tolylsulfonyl.

Cyan-colored photosensitive toner containing zinc oxide

Growing community of inventors

Osaka, Japan

Akiyoshi Urano