Ricoh Company, Ltd.

Tohoku Ricoh Co., Ltd.

Kouichi Ohshima

Hiroshi Adachi

Keishi Taniguchi

Eiichi Kawamura

Masanaga Imamura

Narihito Kojima

Hiroshi Nagame

Yukio Ide

Masanori Rimoto

Hiroshi Tateishi

Fumiaki Arai

Tetsuo Tanaka

Takashi Rokutanzono

Shinji Nosho

Emulsion ink, by which clear images are produced, having excellent drying and fixing properties and preservation stability and does not bleed, strike through or leak. The emulsion ink contains an aqueous emulsified ultraviolet cure compound.

Emulsion ink and printing method using emulsion ink

A stencil base sheet includes a thermoplastic resin film, with a surface of the stencil base sheet on the side of the thermoplastic resin film having a surface smoothness of at least 6000 seconds. From this stencil base sheet, a printing master is prepared by use of a heat-emitting resistor with the application of electric signals thereto with pulse modulation corresponding to image recording density, thereby forming perforations of a different size corresponding to recording image density in the stencil base sheet by thermal fusing. Furthermore, a monochrome or multi-color stencil printing is performed by using the printing master.

Smooth stencil base sheet, method of producing a printing master from

An electrophotographic photoconductor is disclosed, which comprises an electroconductive layer, on which are formed in order, a photoconductive layer, a charge retention layer and a protective layer, optionally an adhesive layer between the charge retention layer and the protective layer, the charge retention layer comprising a silicone resin which comprises: (a) 50 wt. % to 80 wt. % of silicone and oxygen, (b) 10 wt. % to 30 wt. % of carbon, (c) 1 wt. % to 10 wt. % of hydrogen, and (d) 1 wt. % to 10 wt. % of nitrogen. The photoconductive layer may comprise an As-Se alloy, in which case, it is preferable that the amount of As be in the range of 33 wt. % to 38 wt. % and the balance thereof be Se in the As-Se alloy. Preferably the adhesive layer comprises a hardened material containing a metal alkoxide.

Electrophotographic photoconductor having a silicone resin charge

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Mishima, Japan

Kouichi Ohshima