Patents by Inventor Shuichi EGAWA
Shuichi EGAWA 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: 10942472Abstract: An electrophotography device development roller in which an increase in the electric charge of a toner is suppressed is provided. This electrophotography device development roller 10 is provided with a shaft 12, an elastic layer 14 formed on the outer circumference of the shaft 12, and a surface layer 16 formed on the outer circumference of the elastic layer 14. The surface layer 16 contains components (a) to (c) below. Component (a) a binder comprising acrylonitrile-butadiene rubber having an acrylonitrile amount of 30 mass % or more; component (b) an ion-conducting agent comprising at least one selected from a phosphonium salt and a pyridinium salt; and component (c) an electric charge regulator comprising an acrylic polymer having a silicone group or fluorine-containing group and a cationic group.Type: GrantFiled: June 19, 2020Date of Patent: March 9, 2021Assignee: Sumitomo Riko Company LimitedInventors: Kengo Fujii, Shuichi Egawa, Takeru Horiuchi
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Publication number: 20200319574Abstract: An electrophotography device development roller in which an increase in the electric charge of a toner is suppressed is provided. This electrophotography device development roller 10 is provided with a shaft 12, an elastic layer 14 formed on the outer circumference of the shaft 12, and a surface layer 16 formed on the outer circumference of the elastic layer 14. The surface layer 16 contains (a) to (c) below. (a) A binder comprising acrylonitrile-butadiene rubber having an acrylonitrile amount of 30 mass % or more; (b) an ion-conducting agent comprising at least one selected from a phosphonium salt and a pyridinium salt; and (c) an electric charge regulator comprising an acrylic polymer having a silicone group or fluorine-containing group and a cationic group.Type: ApplicationFiled: June 19, 2020Publication date: October 8, 2020Applicant: Sumitomo Riko Company LimitedInventors: Kengo FUJII, Shuichi EGAWA, Takeru HORIUCHI
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Patent number: 9617361Abstract: A modified polymer body 1 has a polymer body 2 composed of a polymer material containing a carbon-carbon double bond and first binding parts 3 and second binding parts 4 bound to the surface of the polymer body 2. The first binding parts 3 are such that an organic group 6 having a functional group is bound via an isocyanuric acid skeleton 5 to the surface of the polymer body 2. The second binding parts 4 are such that an organic group 7 having a functional group is directly bound to the surface of the polymer body 2 without interposing an isocyanuric acid skeleton 5.Type: GrantFiled: May 15, 2014Date of Patent: April 11, 2017Assignee: SUMITOMO RIKO COMPANY LIMITEDInventors: Yosuke Hayashi, Shuichi Egawa, Yasuyuki Hayasaki
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Patent number: 9436151Abstract: An electrophotographic device member can be configured as a roll member 1, a blade member 2, a belt member 3 or the like, and a modified rubber elastic body 12 is used as a material for a portion including the surfaces of the respective members. The modified rubber elastic body 12 has a rubber elastic body 121 having rubber elasticity and a surface-treated layer 122 composed of a cured product of photocurable composition impregnated into the rubber elastic body 121 from 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.Type: GrantFiled: April 20, 2015Date of Patent: September 6, 2016Assignee: SUMITOMO RIKO COMPANY LIMITEDInventors: Yosuke Hayashi, Shuichi Egawa, Keiichi Inoue, Kazushi Yamaguchi, Kazuhiro Iida, Kentaro Imai, Masanori Ishida
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Publication number: 20150248101Abstract: An electrophotographic device member can be configured as a roll member 1, a blade member 2, a belt member 3 or the like, and a modified rubber elastic body 12 is used as a material for a portion including the surfaces of the respective members. The modified rubber elastic body 12 has a rubber elastic body 121 having rubber elasticity and a surface-treated layer 122 composed of a cured product of photocurable composition impregnated into the rubber elastic body 121 from 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.Type: ApplicationFiled: April 20, 2015Publication date: September 3, 2015Applicant: SUMITOMO RIKO COMPANY LIMITEDInventors: Yosuke Hayashi, Shuichi Egawa, Keiichi Inoue, Kazushi Yamaguchi, Kazuhiro Iida, Kentaro Imai, Masanori Ishida
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Publication number: 20140248067Abstract: A modified polymer body 1 has a polymer body 2 composed of a polymer material containing a carbon-carbon double bond and first binding parts 3 and second binding parts 4 bound to the surface of the polymer body 2. The first binding parts 3 are such that an organic group 6 having a functional group is bound via an isocyanuric acid skeleton 5 to the surface of the polymer body 2. The second binding parts 4 are such that an organic group 7 having a functional group is directly bound to the surface of the polymer body 2 without interposing an isocyanuric acid skeleton 5.Type: ApplicationFiled: May 15, 2014Publication date: September 4, 2014Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Yosuke Hayashi, Shuichi Egawa, Yasuyuki Hayasaki
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Patent number: 8718518Abstract: A development roll for electrophotographic equipment includes a shaft body, a rubber elastic layer formed by molding on an outer circumference of the shaft body and having many convex portions formed by transfer molding on the outer circumferential surface thereof, and a coating layer disposed on an outer circumference of the rubber elastic layer. The coating layer is composed of a cured body of a coating material containing (A) a thermoplastic urethane having a number-average molecular weight in the range of 50,000 to 200,000, (B) a polyol having a number-average molecular weight in the range of 500 to 4,000, and (C) a curing agent. The mass percentages a, b, and c of the components (A), (B), and (C) satisfy the following expressions: a+b+c=100, 40?a?75, 5?b?20, and 20?c.Type: GrantFiled: August 6, 2012Date of Patent: May 6, 2014Assignee: Tokai Rubber Industries, Ltd.Inventors: Shuichi Egawa, Masanari Umeda, Yousuke Hayashi
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Publication number: 20120294656Abstract: A development roll for electrophotographic equipment includes a shaft body, a rubber elastic layer formed by molding on an outer circumference of the shaft body and having many convex portions formed by transfer molding on the outer circumferential surface thereof, and a coating layer disposed on an outer circumference of the rubber elastic layer. The coating layer is composed of a cured body of a coating material containing (A) a thermoplastic urethane having a number-average molecular weight in the range of 50,000 to 200,000, (B) a polyol having a number-average molecular weight in the range of 500 to 4,000, and (C) a curing agent. The mass percentages a, b, and c of the components (A), (B), and (C) satisfy the following expressions: a+b+c=100, 40?a?75, 5?b?20, and 20?c.Type: ApplicationFiled: August 6, 2012Publication date: November 22, 2012Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Shuichi EGAWA, Masanari UMEDA, Yousuke HAYASHI