Toyo Ink Manufacturing Company

Hitachi, Ltd.

Toppan Printing Co., Ltd.

Toyo Ink Mfg. Co., Ltd.

Manabu Sawada

Isao Kumano

Hirosada Morishita

Atsushi Kakuta

Yasuki Mori

Kotaro Araya

Shigeo Suzuki

Masumi Koishi

Hiroyuki Oka

Shigemasa Takano

Tsuneo Tanaka

Tsutomu Naganuma

Hiroji Kumagai

Sigeru Hirayama

Akira Arikawa

Nobuyuki Igarashi

A toner for electrophotographs which is prepared by mixing thermoplastic resin core particles (A) having an average size of from 1 to 15 .mu.m with a colorant (B) and without or together with at least one of additives in a finely particulate form while applying mechanical strain force to the whole under such conditions that the average size of the resulting toner particles is in the range of 1-20 .mu.m whereby the colorant (B) and the other necessary fine particles are embedded substantially as primary particles in the resin core particles (A). A process for production of the toner is also disclosed.

Toner for electrophotography

The present invention relates to a lithographic printing plate which can eliminate disadvantages of conventional zinc oxide master papers and has sensitivity sufficient for practical use in respect of long wavelength laser light. The invention contemplates to provide the lithographic printing plate which is fabricated by charging an electrophotographic plate involving a photoconductive layer on a conductive substrate, the photoconductive layer being prepared by dispersing a mixture containing 50 wt % or less of a phthalocyanine pigment/(zinc oxide and zinc sulfide) into a binder resin, exposing the electrophotographic plate to an image to form the electrostatic latent image, developing the exposed electrophotographic plate by the use of an ink receptive toner, and fixing the plate thus developed.

Lithographic printing plate

The disclosure is concerned with an electrophotographic recording medium having a layer of a photoconductive material containing at least one member selected from the group consisting of .tau., .tau.', .eta., and/or .eta.' form metal free phthalocyanine, the layer being formed on an electroconductive supporter. The recording medium of this invention is characterized in that the recording medium exhibits high sensitivity to longer wavelength light.

Electrophotographic recording medium containing .tau. and .eta.

Growing community of inventors

Tokyo, Japan

Manabu Sawada