Patents by Inventor Yoshihisa Mizumoto
Yoshihisa Mizumoto 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: 10199134Abstract: The present invention provides an electrically conductive rubber composition of an electron conductive type which contains neither an expensive ion conductive rubber having a higher environmental dependence nor a softening agent and a liquid rubber which are liable to increase the compression set of a developing roller or contaminate a photoreceptor body, and is usable for production of a more flexible developing roller. The present invention also provides a developing roller produced by using the rubber composition. The electrically conductive rubber composition contains a rubber component including an EPDM and an NBR and/or an SBR, sulfur, a thiazole crosslinking accelerating agent, tetramethylthiuram monosulfide and tetrabutylthiuram disulfide. The developing roller (1) is formed from the electrically conductive rubber composition.Type: GrantFiled: September 2, 2015Date of Patent: February 5, 2019Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takashi Marui, Yoshihisa Mizumoto
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Patent number: 9639025Abstract: A semiconductive roller for use as a developing roller or the like is provided, which has an outer peripheral surface at least partly imparted with a reduced friction coefficient ? without irradiation with ultraviolet radiation. The semiconductive roller (1) includes a tubular body made of a crosslinking product of an electrically conductive rubber composition containing a crosslinkable rubber component, and a chloride film (5) formed in the outer peripheral surface (4) thereof through chlorination.Type: GrantFiled: September 1, 2015Date of Patent: May 2, 2017Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takashi Marui, Kei Tajima, Yoshihisa Mizumoto
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Patent number: 9465315Abstract: A semiconductive roller is provided which includes a roller body formed from a highly extrudable rubber composition containing an SBR and an epichlorohydrin rubber in combination as a rubber component, the roller body having a higher production yield and higher toner imaging durability, and unlikely to suffer from reduction in image density due to adhesion of toner and a contact mark on an outer peripheral surface thereof with a smaller compression set. In the rubber component, the SBR and the epichlorohydrin rubber are present in an SBR excess state. In the rubber composition, a crosslinking component for crosslinking the rubber component includes a sulfur crosslinking agent and 0.75 to 3 parts by mass of a thiazole accelerating agent based on 100 parts by mass of the rubber component. The roller body (2) of the semiconductive roller (1) is made of a crosslinking product of the rubber composition.Type: GrantFiled: August 1, 2013Date of Patent: October 11, 2016Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoshihisa Mizumoto, Takashi Marui, Kenichi Kuroda, Akihiko Kawatani
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Patent number: 9454110Abstract: The transfer member according to the present invention is a transfer member employed for transferring toner in an image forming apparatus utilizing electrophotography, made of a rubber composition at least containing styrene-butadiene rubber, ethylene-propylene-diene rubber and epichlorohydrin rubber as rubber components.Type: GrantFiled: October 18, 2011Date of Patent: September 27, 2016Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoshihisa Mizumoto, Naoyuki Satoyoshi, Kiyotaka Okuda, Masafumi Yamamoto
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Patent number: 9443637Abstract: A semiconductive roller (1) according to the present invention has a nonporous single-layer structure formed from a rubber composition which includes: a rubber component including a styrene butadiene rubber and an epichlorohydrin rubber; and a salt of an anion having a fluoro group and a sulfonyl group in its molecule; the salt being present in the rubber composition in a proportion of 0.05 to 5 parts by mass based on 100 parts by mass of the overall rubber component.Type: GrantFiled: June 3, 2015Date of Patent: September 13, 2016Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoshihisa Mizumoto, Takashi Marui, Kenichi Kuroda
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Publication number: 20160077462Abstract: A semiconductive roller for use as a developing roller or the like is provided, which has an outer peripheral surface at least partly imparted with a reduced friction coefficient ? without irradiation with ultraviolet radiation. The semiconductive roller (1) includes a tubular body made of a crosslinking product of an electrically conductive rubber composition containing a crosslinkable rubber component, and a chloride film (5) formed in the outer peripheral surface (4) thereof through chlorination.Type: ApplicationFiled: September 1, 2015Publication date: March 17, 2016Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takashi MARUI, Kei TAJIMA, Yoshihisa MIZUMOTO
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Publication number: 20160077463Abstract: The present invention provides an electrically conductive rubber composition of an electron conductive type which contains neither an expensive ion conductive rubber having a higher environmental dependence nor a softening agent and a liquid rubber which are liable to increase the compression set of a developing roller or contaminate a photoreceptor body, and is usable for production of a more flexible developing roller. The present invention also provides a developing roller produced by using the rubber composition. The electrically conductive rubber composition contains a rubber component including an EPDM and an NBR and/or an SBR, sulfur, a thiazole crosslinking accelerating agent, tetramethylthiuram monosulfide and tetrabutylthiuram disulfide. The developing roller (1) is formed from the electrically conductive rubber composition.Type: ApplicationFiled: September 2, 2015Publication date: March 17, 2016Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takashi MARUI, Yoshihisa MIZUMOTO
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Publication number: 20150355571Abstract: A semiconductive roller (1) according to the present invention has a nonporous single-layer structure formed from a rubber composition which includes: a rubber component including a styrene butadiene rubber and an epichlorohydrin rubber; and a salt of an anion having a fluoro group and a sulfonyl group in its molecule; the salt being present in the rubber composition in a proportion of 0.05 to 5 parts by mass based on 100 parts by mass of the overall rubber component.Type: ApplicationFiled: June 3, 2015Publication date: December 10, 2015Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoshihisa MIZUMOTO, Takashi MARUI, Kenichi KURODA
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Publication number: 20150192876Abstract: The semiconductive roller according to the present invention includes a nonporous roller body made of a rubber composition containing styrene-butadiene rubber and epichlorohydrin rubber as rubber components.Type: ApplicationFiled: March 20, 2015Publication date: July 9, 2015Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoshihisa MIZUMOTO, Takashi MARUI
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Patent number: 9075340Abstract: An inventive developing roller is adapted for use in an electrophotographic image forming apparatus. The developing roller includes a roller body. At least an outer peripheral surface of the roller body is formed from a rubber composition containing a base rubber. The base rubber contains a styrene butadiene rubber in a proportion of not less than 10 mass % and not greater than 70 mass % based on the overall amount of the base rubber. The outer peripheral surface of the rubber body has a surface roughness Ra of not less than 0.78 ?m and not greater than 1.8 ?m.Type: GrantFiled: June 12, 2012Date of Patent: July 7, 2015Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Kenichi Kuroda, Akihiko Kawatani, Yoshihisa Mizumoto
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Patent number: 9064617Abstract: The electrically conductive rubber composition contains a rubber component including an SBR, an epichlorohydrin rubber and a CR, and the proportion of the SBR is 40 to 80 parts by mass based on 100 parts by mass of the rubber component. The rubber composition further contains 1.0 to 1.5 parts by mass of a sulfur crosslinking agent, 0.2 to 0.6 parts by mass of a thiourea accelerating agent, 0.1 to 0.5 parts by mass of a thiuram accelerating agent, and 1.0 to 2.0 parts by mass of a thiazole accelerating agent based on 100 parts by mass of the rubber component.Type: GrantFiled: July 11, 2013Date of Patent: June 23, 2015Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takashi Marui, Yoshihisa Mizumoto, Kei Tajima
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Patent number: 9011306Abstract: The semiconductive roller according to the present invention includes a nonporous roller body made of a rubber composition containing styrene-butadiene rubber and epichlorohydrin rubber as rubber components.Type: GrantFiled: December 27, 2011Date of Patent: April 21, 2015Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Yoshihisa Mizumoto, Takashi Marui
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Patent number: 8744324Abstract: The semiconductive roller according to the present invention includes a roller body having an outer peripheral surface made of a crosslinked substance of a semiconductive rubber composition and exhibiting Shore A hardness of not more than 60, the semiconductive rubber composition contains a base polymer made of a mixture of (1) mixed rubber N of liquid nitrile rubber and solid nitrile rubber, (2) chloroprene rubber C, and (3) epichlorohydrin rubber E in a mass ratio (C+E)/N of 10/90 to 80/20, the ratios of the chloroprene rubber and the epichlorohydrin rubber in the total quantity of the base polymer are not less than 5 mass % and not less than 5 mass % respectively, and roller resistance at an applied voltage of 5 V is not less than 104? and not more than 109?.Type: GrantFiled: July 1, 2011Date of Patent: June 3, 2014Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Yoshihisa Mizumoto, Akihiko Kawatani, Takashi Marui, Kenichi Kuroda
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Publication number: 20140113783Abstract: A semiconductive roller is provided which includes a roller body formed from a highly extrudable rubber composition containing an SBR and an epichlorohydrin rubber in combination as a rubber component, the roller body having a higher production yield and higher toner imaging durability, and unlikely to suffer from reduction in image density due to adhesion of toner and a contact mark on an outer peripheral surface thereof with a smaller compression set. In the rubber component, the SBR and the epichlorohydrin rubber are present in an SBR excess state. In the rubber composition, a crosslinking component for crosslinking the rubber component includes a sulfur crosslinking agent and 0.75 to 3 parts by mass of a thiazole accelerating agent based on 100 parts by mass of the rubber component. The roller body (2) of the semiconductive roller (1) is made of a crosslinking product of the rubber composition.Type: ApplicationFiled: August 1, 2013Publication date: April 24, 2014Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoshihisa MIZUMOTO, Takashi MARUI, Kenichi KURODA, Akihiko KAWATANI
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Publication number: 20140103262Abstract: The electrically conductive rubber composition contains a rubber component including an SBR, an epichlorohydrin rubber and a CR, and the proportion of the SBR is 40 to 80 parts by mass based on 100 parts by mass of the rubber component. The rubber composition further contains 1.0 to 1.5 parts by mass of a sulfur crosslinking agent, 0.2 to 0.6 parts by mass of a thiourea accelerating agent, 0.1 to 0.5 parts by mass of a thiuram accelerating agent, and 1.0 to 2.0 parts by mass of a thiazole accelerating agent based on 100 parts by mass of the rubber component.Type: ApplicationFiled: July 11, 2013Publication date: April 17, 2014Inventors: Takashi Marui, Yoshihisa Mizumoto, Kei Tajima
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Patent number: 8670700Abstract: A developing roller is provided, which is particularly used in an image forming apparatus of a highly durable design and is free from toner leakage even after formation of a predetermined number of images. Opposite end regions (5a) of an outer peripheral surface (5) of a roller body (2) of the developing roller (1) to be respectively kept in sliding contact with seal members each have a friction coefficient ? of not greater than 0.15.Type: GrantFiled: July 27, 2012Date of Patent: March 11, 2014Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Kenichi Kuroda, Akihiko Kawatani, Masakazu Tanaka, Yoshihisa Mizumoto
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Publication number: 20130089362Abstract: A developing roller is provided, which is particularly used in an image forming apparatus of a highly durable design and is free from toner leakage even after formation of a predetermined number of images. Opposite end regions (5a) of an outer peripheral surface (5) of a roller body (2) of the developing roller (1) to be respectively kept in sliding contact with seal members each have a friction coefficient ? of not greater than 0.15.Type: ApplicationFiled: July 27, 2012Publication date: April 11, 2013Inventors: Kenichi KURODA, Akihiko Kawatani, Masakazu Tanaka, Yoshihisa Mizumoto
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Patent number: 8396402Abstract: The present invention provides a conductive roller having a toner transport part composed of a vulcanized rubber composition at least on an outermost layer thereof. The vulcanized rubber composition contains a rubber component (A), highly conductive carbon black (B) having a particle diameter not less than 18 nm and less than 80 nm, an inorganic filler (C) consisting of not less than one kind of a metal oxide selected from among a group of titanium oxide, alumina, and silica. A total of a content of the highly conductive carbon black (B) and a content of the inorganic filler (C) for 100 parts by mass of the rubber component (A) is not less than 10 parts by mass nor more than 60 parts by mass.Type: GrantFiled: September 29, 2009Date of Patent: March 12, 2013Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Yoshihisa Mizumoto
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Publication number: 20130051870Abstract: An inventive developing roller is adapted for use in an electrophotographic image forming apparatus. The developing roller includes a roller body. At least an outer peripheral surface of the roller body is formed from a rubber composition containing a base rubber. The base rubber contains a styrene butadiene rubber in a proportion of not less than 10 mass % and not greater than 70 mass % based on the overall amount of the base rubber. The outer peripheral surface of the rubber body has a surface roughness Ra of not less than 0.78 ?m and not greater than 1.8 ?m.Type: ApplicationFiled: June 12, 2012Publication date: February 28, 2013Inventors: Kenichi KURODA, Akihiko Kawatani, Yoshihisa Mizumoto
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Patent number: 8277692Abstract: The semiconductive rubber composition according to the present invention contains: a rubber content containing at least copolymer rubber containing ethylene oxide as a copolymeric component and chloroprene rubber; and not less than 0.5 parts by mass and not more than 1.5 parts by mass of a thiourea-based vulcanization accelerator, not less than 0.5 parts by mass and not more than 1.5 parts by mass of a guanidine-based vulcanization accelerator and not less than 0.5 parts by mass and not more than 2.0 parts by mass of a peroxide-based crosslinking agent with respect to 100 parts by mass of the sum of the rubber content.Type: GrantFiled: February 4, 2010Date of Patent: October 2, 2012Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Takashi Marui, Yoshihisa Mizumoto, Kei Tajima, Noriaki Hitomi