Sumitomo Riko Company Limited

Tokai Rubber Industries, Ltd.

Masanori Ishida

Toshihiko Arata

Shimpei Miyagawa

Kadai Takeyama

Yosuke Hayashi

Kazushi Yamaguchi

Kentaro Imai

Yoshihiro Saito

Kunio Ito

Kazuhiro Iida

Hiroshi Ukai

Shuichi Egawa

Koji Yamaguchi

Yasuyuki Hayasaki

Keisuke Tokoro

Fumio Misumi

Atsushi Ozaki

Keiichi Inoue

Takayuki Ootani

Masanori Satou

In a charging roll, grooves regularly defining spirals are formed on an elastic body layer, with a groove width of 4 μm to 280 μm and a groove depth of 2 μm to 30 μm. On an outer peripheral surface of the elastic body layer, an area ratio between an area of a bottom surface of the groove and an area of a plane part is 0.3 to 2.4. The surface layer includes a binder polymer and a roughness forming particle. The roughness forming particle is arranged on the plane part and the groove. A surface roughness of the surface layer on the groove is 2 μm to 16 μm. A surface roughness of the entire surface layer is 5 μm to 26 μm. A thickness of the binder polymer covering the roughness forming particle on the groove is greater than that on the plane part.

Charging roll for electrophotographic apparatus

The disclosure shows a cleaning blade for electrophotographic equipment, the cleaning blade through which both high hardness and low warping are obtained and excellent toner scraping properties are realized. The cleaning blade () includes a blade part () comprising a cured material of a urethane composition containing a polyol, an isocyanate, and a crosslinker or a chain extender. The content of the isocyanate is 28.0 mass % or more with respect to the entire composition. The crosslinker or the chain extender comprises a triol having a molecular weight of 150 or less. The content of the crosslinker or the chain extender is 4.0 mass % or less with respect to the entire composition. The content of the triol having a molecular weight of 150 or less is 0.8 mass % or more with respect to the entire composition.

Cleaning blade for electrophotographic equipment

To provide a composition for a cleaning blade for an electrophotographic apparatus, and a cleaning blade for an electrophotographic apparatus that are capable of suppressing wear, chipping, curling, and contamination. A urethane composition contains (a) a polyester polyol, (b) a polyisocyanate, and (c) a modified silicone oil, wherein the (c) modified silicone oil contains a polysiloxane block and an alkylene oxide block, the alkylene oxide block having a hydroxyl group protected by a protecting group, and the (c) modified silicone oil has no hydroxyl group. A cleaning blade is made of a molding of the urethane composition and contains a polyurethane elastomer and the (c) modified silicone oil.

Composition for cleaning blade for electrophotographic apparatus and cleaning blade for electrophotographic apparatus

To provide a conductive member for an electrophotographic machine that is capable of preventing hardening degradation of a surface layer that is caused by an ionic conductive agent contained in a conductive rubber elastic body layer, allowing the surface layer to be improved in durability. A conductive memberfor an electrophotographic machine includes a conductive rubber elastic body layercontaining crosslinked rubber and an ionic conductive agent, and a surface layerprovided on an outer periphery of the conductive rubber elastic body layer, wherein the surface layercontains a polymer and polyphenol. Examples of the polyphenol include a tannin, gallic acid, ellagic acid, pyrogallol, catechin, and chlorogenic acid.

Conductive member for electrophotographic machine

An electrophotographic device member R is used in an electrophotographic device. The electrophotographic device member R has a surface layer. The surface layerhas a matrix polymerforming a skeleton of the surface layerand a surface modifiercontained in the matrix polymer. The surface modifieris composed of a copolymer containing, in its molecule, a first polymerization unit derived from a (meth)acrylate having a silicone groupand a second polymerization unit derived from a (meth)acrylate having a fluorine-containing group

Electrophotographic device member

An electrophotographic device member can be configured as a roll member, a blade member, a belt memberor the like, and a modified rubber elastic bodyis used as a material for a portion including the surfaces of the respective members. The modified rubber elastic bodyhas a rubber elastic bodyhaving rubber elasticity and a surface-treated layercomposed of a cured product of photocurable composition impregnated into the rubber elastic bodyfrom the surface thereof. The photocurable composition is configured to include a (meth)acryl monomer, a photopolymerizable polymer having a silicone group and/or a fluorine-containing group and a (meth)acryloyl group in a molecule, and a photopolymerization initiator.

A developing roll which may reduce stress imparted on toner and have uniform transportability of toner. The developing roll comprises a shaft, an elastic layer provided on an outer peripheral surface of the shaft, and a cylindrical outermost layer provided directly or indirectly via a layer on an outer peripheral surface of the elastic layer, wherein an outer peripheral surface of the outermost layer is formed into a rough surface by distribution of multiple dimples in such a manner that open ends thereof do not overlap one another on the surface and a portion other than the dimples on the rough surface forms a remaining portion of a cylindrical shape.

Developing roll

Growing community of inventors

Komaki, Japan

Masanori Ishida