Patents by Inventor Kadai Takeyama
Kadai Takeyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10656555Abstract: Provided is a development roll for electrophotography devices in which image defects are suppressed and which achieve both maintenance of high charging properties and discharging properties. The development roll is provided with a shaft member, an elastic substance layer formed on the outer circumference of the shaft member, an intermediate layer formed on the outer circumference of the elastic substance layer, and a surface layer formed on the outer circumference of the intermediate layer. The volume resistivity of the surface layer 18 is within the range of 1.0×1014 to 1.0×1020 ?·cm, and the volume resistivity of the intermediate layer 16 is within the range of 1.0×107 to 1.0×1013 ?·cm.Type: GrantFiled: September 12, 2019Date of Patent: May 19, 2020Assignee: Sumitomo Riko Company LimitedInventors: Kentaro Imai, Kadai Takeyama, Yutaka Kadoshima, Kosuke Minematsu, Satoshi Tatsumi
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Patent number: 10635041Abstract: Provided is a cleaning blade. The cleaning blade is used for removing remaining toner which remains on a surface of the target member in an electrophotographic apparatus. The cleaning blade is provided with the blade portion having the edge portion which comes into sliding contact with the target member. The edge portion includes: a substrate of the blade portion; an inner layer extending from a surface of the substrate to the inside of the substrate; and an outer layer extending from a surface of the substrate to an outer outside of the substrate. The inner layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of less than 1 ?m. The outer layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of 0.02 ?m or less.Type: GrantFiled: May 28, 2018Date of Patent: April 28, 2020Assignee: Sumitomo Riko Company LimitedInventors: Yasunori Nimura, Kadai Takeyama, Toshihiko Arata, Shimpei Miyagawa, Satoshi Endo
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Publication number: 20200012210Abstract: Provided is a development roll for electrophotography devices in which image defects are suppressed and which achieve both maintenance of high charging properties and discharging properties. The development roll is provided with a shaft member, an elastic substance layer formed on the outer circumference of the shaft member, an intermediate layer formed on the outer circumference of the elastic substance layer, and a surface layer formed on the outer circumference of the intermediate layer. The volume resistivity of the surface layer 18 is within the range of 1.0×1014 to 1.0×1020 ?·cm, and the volume resistivity of the intermediate layer 16 is within the range of 1.0×107 to 1.0×1013 ?·cm.Type: ApplicationFiled: September 12, 2019Publication date: January 9, 2020Applicant: Sumitomo Riko Company LimitedInventors: Kentaro IMAI, Kadai TAKEYAMA, Yutaka KADOSHIMA, Kosuke MINEMATSU, Satoshi TATSUMI
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Patent number: 10203648Abstract: 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 (10) includes a blade part (12) 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.Type: GrantFiled: June 25, 2018Date of Patent: February 12, 2019Assignee: Sumitomo Riko Company LimitedInventors: Kadai Takeyama, Masanori Ishida, Toshihiko Arata, Shimpei Miyagawa
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Publication number: 20180307178Abstract: 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 (10) includes a blade part (12) 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.Type: ApplicationFiled: June 25, 2018Publication date: October 25, 2018Applicant: Sumitomo Riko Company LimitedInventors: Kadai TAKEYAMA, Masanori ISHIDA, Toshihiko ARATA, Shimpei MIYAGAWA
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Patent number: 10095176Abstract: 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.Type: GrantFiled: October 19, 2017Date of Patent: October 9, 2018Assignee: SUMITOMO RIKO COMPANY LIMITEDInventors: Shimpei Miyagawa, Toshihiko Arata, Masanori Ishida, Kadai Takeyama
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Publication number: 20180275595Abstract: Provided is a cleaning blade. The cleaning blade is used for removing remaining toner which remains on a surface of the target member in an electrophotographic apparatus. The cleaning blade is provided with the blade portion having the edge portion which comes into sliding contact with the target member. The edge portion includes: a substrate of the blade portion; an inner layer extending from a surface of the substrate to the inside of the substrate; and an outer layer extending from a surface of the substrate to an outer outside of the substrate. The inner layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of less than 1 ?m. The outer layer contains at least an acrylic resin or a methacrylate resin, and has a thickness of 0.02 ?m or less.Type: ApplicationFiled: May 28, 2018Publication date: September 27, 2018Applicant: Sumitomo Riko Company LimitedInventors: Yasunori Nimura, Kadai Takeyama, Toshihiko Arata, Shimpei Miyagawa, Satoshi Endo
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Publication number: 20180046116Abstract: Provided is an endless belt in which surface cracks due to ozone deterioration, and a belt deformation tendency can be inhibited. The endless belt is intended for use in an electrophotographic image forming device. The endless belt includes a tubular base layer and an elastic layer laminated on the outer circumference of the base layer. The elastic layer includes a cured material of a composition containing a polycarbonate polyol, a polyisocyanate, and a rubber polymer having a double bond. A mass ratio of the polycarbonate polyol and the rubber polymer in the composition may be in a range of 5:95 to 95:5. The rubber polymer preferably contains at least one of an acrylonitrile-butadiene rubber and an epichlorohydrin rubber.Type: ApplicationFiled: October 10, 2017Publication date: February 15, 2018Applicant: SUMITOMO RIKO COMPANY LIMITEDInventors: Kadai Takeyama, Teruyoshi Kimpara, Daiki Ito
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Publication number: 20180039223Abstract: 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.Type: ApplicationFiled: October 19, 2017Publication date: February 8, 2018Applicant: Sumitomo Riko Company LimitedInventors: Shimpei Miyagawa, Toshihiko Arata, Masanori Ishida, Kadai Takeyama
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Publication number: 20150241809Abstract: A phenol resin adhesive is applied to the outer peripheral surface of an axis body 2 and heated for baking to thereby form a undercoating layer 31. A phenol resin adhesive is further applied to the outer peripheral surface of the undercoating layer 31 to thereby form an upper coating layer 32. A rubber elastic layer-forming unvulcanized material for forming a rubber elastic layer 4 is laminated on the outer peripheral surface of the upper coating layer 32, and the rubber elastic layer forming material is vulcanized by heating to thereby form the rubber elastic layer 4, wherein the rubber elastic layer 4 and the undercoating layer 31 are adhered through the upper coating layer 32 while heated and vulcanized.Type: ApplicationFiled: May 8, 2015Publication date: August 27, 2015Applicant: SUMITOMO RIKO COMPANY LIMITEDInventors: Naoaki Sasakibara, Hiroshi Ukai, Kadai Takeyama
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Patent number: 8913931Abstract: Provided is a developing roll for use in an electrophotographic machine capable of preventing an ion conductive agent from blooming and retaining long-term charge decay characteristics. The roll (1) includes a shaft (2), an elastomeric layer (3) and a surface layer (4), wherein the surface layer contains a composition containing an (A) ingredient defining a binder resin having a functional group reactive with an alkoxy silyl group in a (B) ingredient, and the (B) ingredient defining an ion conductive agent containing a cation having a chemical structure represented by R1-N+-R2-Si(OR3)3, where R1: a cyclic organic group or a linear organic group, R2: a group containing at least (CH2)n, n representing an integer number, and R3: an alkyl group, wherein the cation is bound with the (A) ingredient, and wherein the (B) ingredient is 0.10 to 3 parts by mass with respect to 100 parts by mass of the (A) ingredient.Type: GrantFiled: April 16, 2013Date of Patent: December 16, 2014Assignee: Tokai Rubber Industries, Ltd.Inventors: Yosuke Hayashi, Naoki Yamaguchi, Atsushi Ozaki, Kadai Takeyama
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Patent number: 8747701Abstract: The charging roller has a base layer formed of an electroconductive rubber composition containing (a) a polar rubber having an unsaturated bond or an ether bond, (b) an ion carrier containing one or more phosphonium salts selected from the group consisting of phosphonium salts having the formulae (1) and (2), and (c) a cross-linker, wherein the amount of (b) component ranges from 0.1 to 10 parts by mass per 100 parts by mass of the (a) component. The formula (1) represents [(H9C4)3(CnH2n+1)P]+(CF3SO2)2N—, and the formula (2) represents [(H9C4)3(CnH2n+1)P]+(CF3SO3)—.Type: GrantFiled: July 29, 2011Date of Patent: June 10, 2014Assignee: Tokai Rubber Industries, Ltd.Inventors: Kadai Takeyama, Takenori Saito, Naoaki Sasakibara, Keiichi Ikegami
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Publication number: 20130300017Abstract: A foamed elastic body having low hardness and excellent flatness and smoothness on the outer circumference, and imparting low hardness to the surface of a conductive roll for an electrophotographic machine, in which coating layers having various functions are coated on the outer circumference. A tube-shaped foamed elastic body has a skin layer and open foamed cells on outer and inner circumferences respectively. The body is prepared by heating and cross-linking an outer circumference of a non-cross-linked and non-foamed tube body with a shaft core inserted therein, and removing the core and heating the tube body under normal pressure. The skin layer thickness is preferably in the range of 10 to 100 ?m. The body defines a base layer of a conductive roll, and an outermost layer and an intermediate layer are coated on the outer circumference of the layer.Type: ApplicationFiled: July 12, 2013Publication date: November 14, 2013Inventors: Atsuhiro KAWANO, Kadai TAKEYAMA, Yasuhide WANTANABE
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Publication number: 20120288306Abstract: A conductive member for an electrophotographic device includes a conductive rubber elastic layer. The conductive rubber elastic layer is composed of a cross-linked product of a conductive rubber composition containing (a) a polar rubber, (b) at least one ion-conductive agent selected from diallyldimethylammonium.bis(trifluoromethanesulfonyl)imide and diallyldimethylammonium.trifluoromethanesulfonate and (c) a cross-linking agent, and the cross-linked product has a relative dielectric constant of 23 or more.Type: ApplicationFiled: July 30, 2012Publication date: November 15, 2012Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Keiichi Ikegami, Kadai Takeyama
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Patent number: 8235879Abstract: A charging roll includes a shaft and an ionically conductive elastic layer formed around the shaft. The ionically conductive elastic layer is formed of a rubber composition free of any electron-conductive agent and containing 0.7 to 1.0 parts by weight of a peroxide cross-linking agent per 100 parts by weight of an ion-conductive rubber. The ion-conductive rubber is formed of at least one of an epichlorohydrin rubber and a nitrile rubber, and a percentage of a rubber component in the ionically conductive elastic layer measured by thermogravimetric analysis is 90% or more by weight.Type: GrantFiled: June 18, 2008Date of Patent: August 7, 2012Assignee: Tokai Rubber Industries, Ltd.Inventors: Kenichi Tsuchiya, Naoaki Sasakibara, Fumio Misumi, Satoshi Suzuki, Kadai Takeyama
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Publication number: 20120025143Abstract: The charging roller has a base layer formed of an electroconductive rubber composition containing (a) a polar rubber having an unsaturated bond or an ether bond, (b) an ion carrier containing one or more phosphonium salts selected from the group consisting of phosphonium salts having the formulae (1) and (2), and (c) a cross-linker, wherein the amount of (b) component ranges from 0.1 to 10 parts by mass per 100 parts by mass of the (a) component. The formula (1) represents [(H9O4)3(CnH2n+1)P]+(CF3SO2)2N—, and the formula (2) represents [(H9O4)3(CnH2n+1)P]+(CF3SO3)—.Type: ApplicationFiled: July 29, 2011Publication date: February 2, 2012Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Kadai Takeyama, Takenori Saito, Naoaki Sasakibara, Keiichi Ikegami
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Publication number: 20090226647Abstract: A foamed elastic body having low hardness and excellent flatness and smoothness on the outer circumference, and imparting low hardness to the surface of a conductive roll for an electrophotographic machine, in which coating layers having various functions are coated on the outer circumference. A tube-shaped foamed elastic body 10 has a skin layer 12 and open foamed cells 14a on outer and inner circumferences respectively. The body 10 is prepared by heating and cross-linking an outer circumference of a non-cross-linked and non-foamed tube body with a shaft core inserted therein, and removing the core and heating the tube body under normal pressure. The skin layer thickness is preferably in the range of 10 to 100 ?m. The body 10 defines a base layer 10 of a conductive roll 20, and an outermost layer 24 and an intermediate layer 26 are coated on the outer circumference of the layer 10.Type: ApplicationFiled: March 6, 2009Publication date: September 10, 2009Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Atsuhiro KAWANO, Kadai TAKEYAMA, Yasuhide WATANABE
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Publication number: 20090005225Abstract: A charging roll includes a shaft and an ionically conductive elastic layer formed around the shaft. The ionically conductive elastic layer is formed of a rubber composition free of any electron-conductive agent and containing 0.7 to 1.0 parts by weight of a peroxide cross-linking agent per 100 parts by weight of an ion-conductive rubber. The ion-conductive rubber is formed of at least one of an epichlorohydrin rubber and a nitrile rubber, and a percentage of a rubber component in the ionically conductive elastic layer measured by thermogravimetric analysis is 90% or more by weight.Type: ApplicationFiled: June 18, 2008Publication date: January 1, 2009Applicant: Tokai Rubber Industries, Ltd.Inventors: Kenichi Tsuchiya, Naoaki Sasakibara, Fumio Misumi, Satoshi Suzuki, Kadai Takeyama