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).

  • Patent number: 10656555
    Abstract: 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: Grant
    Filed: September 12, 2019
    Date of Patent: May 19, 2020
    Assignee: Sumitomo Riko Company Limited
    Inventors: Kentaro Imai, Kadai Takeyama, Yutaka Kadoshima, Kosuke Minematsu, Satoshi Tatsumi
  • Patent number: 10635041
    Abstract: 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: Grant
    Filed: May 28, 2018
    Date of Patent: April 28, 2020
    Assignee: Sumitomo Riko Company Limited
    Inventors: Yasunori Nimura, Kadai Takeyama, Toshihiko Arata, Shimpei Miyagawa, Satoshi Endo
  • Publication number: 20200012210
    Abstract: 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: Application
    Filed: September 12, 2019
    Publication date: January 9, 2020
    Applicant: Sumitomo Riko Company Limited
    Inventors: Kentaro IMAI, Kadai TAKEYAMA, Yutaka KADOSHIMA, Kosuke MINEMATSU, Satoshi TATSUMI
  • Patent number: 10203648
    Abstract: 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: Grant
    Filed: June 25, 2018
    Date of Patent: February 12, 2019
    Assignee: Sumitomo Riko Company Limited
    Inventors: Kadai Takeyama, Masanori Ishida, Toshihiko Arata, Shimpei Miyagawa
  • Publication number: 20180307178
    Abstract: 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: Application
    Filed: June 25, 2018
    Publication date: October 25, 2018
    Applicant: Sumitomo Riko Company Limited
    Inventors: Kadai TAKEYAMA, Masanori ISHIDA, Toshihiko ARATA, Shimpei MIYAGAWA
  • Patent number: 10095176
    Abstract: 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: Grant
    Filed: October 19, 2017
    Date of Patent: October 9, 2018
    Assignee: SUMITOMO RIKO COMPANY LIMITED
    Inventors: Shimpei Miyagawa, Toshihiko Arata, Masanori Ishida, Kadai Takeyama
  • Publication number: 20180275595
    Abstract: 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: Application
    Filed: May 28, 2018
    Publication date: September 27, 2018
    Applicant: Sumitomo Riko Company Limited
    Inventors: Yasunori Nimura, Kadai Takeyama, Toshihiko Arata, Shimpei Miyagawa, Satoshi Endo
  • Publication number: 20180046116
    Abstract: 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: Application
    Filed: October 10, 2017
    Publication date: February 15, 2018
    Applicant: SUMITOMO RIKO COMPANY LIMITED
    Inventors: Kadai Takeyama, Teruyoshi Kimpara, Daiki Ito
  • Publication number: 20180039223
    Abstract: 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: Application
    Filed: October 19, 2017
    Publication date: February 8, 2018
    Applicant: Sumitomo Riko Company Limited
    Inventors: Shimpei Miyagawa, Toshihiko Arata, Masanori Ishida, Kadai Takeyama
  • Publication number: 20150241809
    Abstract: 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: Application
    Filed: May 8, 2015
    Publication date: August 27, 2015
    Applicant: SUMITOMO RIKO COMPANY LIMITED
    Inventors: Naoaki Sasakibara, Hiroshi Ukai, Kadai Takeyama
  • Patent number: 8913931
    Abstract: 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: Grant
    Filed: April 16, 2013
    Date of Patent: December 16, 2014
    Assignee: Tokai Rubber Industries, Ltd.
    Inventors: Yosuke Hayashi, Naoki Yamaguchi, Atsushi Ozaki, Kadai Takeyama
  • Patent number: 8747701
    Abstract: 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: Grant
    Filed: July 29, 2011
    Date of Patent: June 10, 2014
    Assignee: Tokai Rubber Industries, Ltd.
    Inventors: Kadai Takeyama, Takenori Saito, Naoaki Sasakibara, Keiichi Ikegami
  • Publication number: 20130300017
    Abstract: 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: Application
    Filed: July 12, 2013
    Publication date: November 14, 2013
    Inventors: Atsuhiro KAWANO, Kadai TAKEYAMA, Yasuhide WANTANABE
  • Publication number: 20120288306
    Abstract: 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: Application
    Filed: July 30, 2012
    Publication date: November 15, 2012
    Applicant: TOKAI RUBBER INDUSTRIES, LTD.
    Inventors: Keiichi Ikegami, Kadai Takeyama
  • Patent number: 8235879
    Abstract: 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: Grant
    Filed: June 18, 2008
    Date of Patent: August 7, 2012
    Assignee: Tokai Rubber Industries, Ltd.
    Inventors: Kenichi Tsuchiya, Naoaki Sasakibara, Fumio Misumi, Satoshi Suzuki, Kadai Takeyama
  • Publication number: 20120025143
    Abstract: 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: Application
    Filed: July 29, 2011
    Publication date: February 2, 2012
    Applicant: TOKAI RUBBER INDUSTRIES, LTD.
    Inventors: Kadai Takeyama, Takenori Saito, Naoaki Sasakibara, Keiichi Ikegami
  • Publication number: 20090226647
    Abstract: 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: Application
    Filed: March 6, 2009
    Publication date: September 10, 2009
    Applicant: TOKAI RUBBER INDUSTRIES, LTD.
    Inventors: Atsuhiro KAWANO, Kadai TAKEYAMA, Yasuhide WATANABE
  • Publication number: 20090005225
    Abstract: 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: Application
    Filed: June 18, 2008
    Publication date: January 1, 2009
    Applicant: Tokai Rubber Industries, Ltd.
    Inventors: Kenichi Tsuchiya, Naoaki Sasakibara, Fumio Misumi, Satoshi Suzuki, Kadai Takeyama