Patents by Inventor Yasuyuki Hayasaki
Yasuyuki Hayasaki 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: 11982941Abstract: Provided is a flexographic printing plate precursor which can suppress chipping of relief images while maintaining printing properties. The flexographic printing plate precursor (10) includes a photosensitive layer (16) which includes (A) a water-dispersed latex, (B) a millable rubber, (C) a surfactant, (D) photopolymerizable compounds, and (E) a photopolymerization initiator, the (D) including the following (d1) to (d3). (d1) is a photopolymerizable compound of a chain structure having no cyclic structure, (d2) is a monofunctional photopolymerizable compound having a cyclic structure, and (d3) is a bifunctional photopolymerizable compound having a cyclic structure.Type: GrantFiled: April 10, 2020Date of Patent: May 14, 2024Assignee: Sumitomo Riko Company LimitedInventors: Koji Morihara, Hideyuki Hashimoto, Daisuke Inoue, Koki Matsuoka, Yasuyuki Hayasaki
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Publication number: 20230242798Abstract: This seal member is a cured product of a silicone rubber composition that comprises a silicone rubber and silica particles, and has multiple insertion holes into which counterpart members are inserted; and this seal member satisfies the following conditions (a) to (d). (a) If X (parts by mass) is the content of the silica particles relative to 100 parts by mass of a base polymer of the silicone rubber, (elastic recovery rate (%))/(X (parts by mass)) is from 3.6 to 9.6. (b) The type A durometer hardness is from 15 to 30. (c) The tensile strength at break is 2.1 MPa or more. (d) The coefficient of kinetic friction of the surfaces of the insertion holes is 2.5 or less.Type: ApplicationFiled: April 10, 2023Publication date: August 3, 2023Applicant: Sumitomo Riko Company LimitedInventors: Takahiro MORITA, Yasuyuki Hayasaki, Ryosuke Yamaoka, Risa Tajima
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Publication number: 20230219777Abstract: A conveying belt has a cylindrical base layer, and a surface layer that is formed on the outer peripheral surface of the base layer. The base layer contains polyimide or polyamide-imide, and has an elastic modulus from 3-7 GPa, inclusive. The surface layer is configured as a cured object from a resin composition that contains a fluororesin having a hydroxy group, an isocyanate curing agent, and a silicone copolymer. The silicone copolymer is a copolymer containing a silicone unit and another kind of unit not having a siloxane skeleton, has a hydroxy group, and contains siloxane units in a proportion of at least 95 mol% and less than 100 mol%, or from 40-70 mol%, inclusive. The silicone copolymer content in the resin composition is 1-5 parts by mass, inclusive, relative to a total 100 parts by mass of the fluororesin and the isocyanate curing agent.Type: ApplicationFiled: March 7, 2023Publication date: July 13, 2023Applicant: Sumitomo Riko Company LimitedInventors: Hironari Nishioka, Daisuke Inoue, Yasuyuki Hayasaki, Sho Sakamoto, Yasuhide Watanabe, Fumio Misumi, Daiki Ito, Isamu Maruyama, Shingo Nakaichi
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Publication number: 20220186027Abstract: Provided is a silicone rubber composition that allows for both the securing of time for filling materials and an improvement in productivity which is achievable due to a short curing time, and that has excellent reproducibility of curing properties. The silicone rubber composition contains (a) an organopolysiloxane having an alkenyl group, (b) a peroxide cross-linking agent, and (c) a heat stabilizer, wherein (c) includes a compound represented by general formula (1). In formula (1), R1 represents hydrogen or a methyl group, R2, R3, R4, and R5, each independently represent a C1-9 alkyl group, and R6 represents hydrogen or a methyl group.Type: ApplicationFiled: March 2, 2022Publication date: June 16, 2022Applicant: Sumitomo Riko Company LimitedInventors: Takahiro Morita, Tomohito Seki, Yasuyuki HAYASAKI, Ryosuke Yamaoka
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Publication number: 20210364954Abstract: A fixing member 10 for an electrophotographic device includes a base layer 12, a metal layer 14 formed on the based layer 12, and a protective layer 16 formed on the metal layer 14. The metal layer 14 is configured to form a predetermined pattern. The base layer 12 has a surface 12a which is covered with the metal layer 14 and a surface 12b which is not covered with the metal layer 14. The protective layer 16 continuously covers the surface 12b of the base layer 12 not covered with the metal layer 14 and a surface of the metal layer 14, and is bonded to the surface 12b of the base layer 12 not covered with the metal layers 14. The base layer 12 and the protective layer 16 contain a resin that includes an imide bond in a repeating unit.Type: ApplicationFiled: August 9, 2021Publication date: November 25, 2021Applicant: Sumitomo Riko Company LimitedInventors: Kazunori TAKAKI, Hirotoshi MATSUDA, Daiki ITO, Yasuhide WATANABE, Isamu MARUYAMA, Shingo NAKAICHI, Yasuyuki HAYASAKI
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Publication number: 20200241416Abstract: Provided is a flexographic printing plate precursor which can suppress chipping of relief images while maintaining printing properties. The flexographic printing plate precursor (10) includes a photosensitive layer (16) which includes (A) a water-dispersed latex, (B) a millable rubber, (C) a surfactant, (D) photopolymerizable compounds, and (E) a photopolymerization initiator, the (D) including the following (d1) to (d3). (d1) is a photopolymerizable compound of a chain structure having no cyclic structure, (d2) is a monofunctional photopolymerizable compound having a cyclic structure, and (d3) is a bifunctional photopolymerizable compound having a cyclic structure.Type: ApplicationFiled: April 10, 2020Publication date: July 30, 2020Applicant: Sumitomo Riko Company LimitedInventors: Koji MORIHARA, Hideyuki HASHIMOTO, Daisuke INOUE, Koki MATSUOKA, Yasuyuki HAYASAKI
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Patent number: 10691038Abstract: There is provided a conductive roller for electrophotographic equipment in which a shaft made of core metal has excellent rust resistance. The conductive roller includes a shaft made of core metal, a protective layer formed on the outer periphery of the shaft, and a conductive rubber elastic layer formed on the outer periphery of the protective layer. In a conductive roller for electrophotographic equipment, the conductive rubber elastic layer contains a rubber containing halogen atoms, and the protective layer is formed of a crosslinked material of a composition containing a material obtained by melting and mixing the following components (a) to (c): (a) a polyfunctional maleimide compound having two or more maleimide groups; (b) a benzoxazine compound; and (c) an epoxy resin.Type: GrantFiled: November 7, 2019Date of Patent: June 23, 2020Assignee: Sumitomo Riko Company LimitedInventors: Takahisa Kose, Shigeki Kanda, Yasuyuki Hayasaki, Hiroshi Ukai
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Publication number: 20200073274Abstract: There is provided a conductive roller for electrophotographic equipment in which a shaft made of core metal has excellent rust resistance. The conductive roller includes a shaft made of core metal, a protective layer formed on the outer periphery of the shaft, and a conductive rubber elastic layer formed on the outer periphery of the protective layer. In a conductive roller for electrophotographic equipment, the conductive rubber elastic layer contains a rubber containing halogen atoms, and the protective layer is formed of a crosslinked material of a composition containing a material obtained by melting and mixing the following components (a) to (c): (a) a polyfunctional maleimide compound having two or more maleimide groups; (b) a benzoxazine compound; and (c) an epoxy resin.Type: ApplicationFiled: November 7, 2019Publication date: March 5, 2020Applicant: Sumitomo Riko Company LimitedInventors: Takahisa KOSE, Shigeki KANDA, Yasuyuki HAYASAKI, Hiroshi UKAI
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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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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: 7356294Abstract: 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.Type: GrantFiled: December 22, 2005Date of Patent: April 8, 2008Assignee: Tokai Rubber Industries, Ltd.Inventors: Masanori Ishida, Kazushi Yamaguchi, Koji Yamaguchi, Yasuyuki Hayasaki
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Publication number: 20060147229Abstract: 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.Type: ApplicationFiled: December 22, 2005Publication date: July 6, 2006Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Masanori Ishida, Kazushi Yamaguchi, Koji Yamaguchi, Yasuyuki Hayasaki
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Patent number: 6918866Abstract: An electrically conductive roll includes a shaft body and at least a conductive elastic layer formed by extrusion on an outer circumferential surface of the shaft body. The conductive elastic layer is formed from at least one conductive rubber composition which includes a rubber material, a thermoplastic resin having crosslinkable double bonds and a melting point in a range from 40° C. to 100° C., and at least one conductive agent. The thermoplastic resin is included in an amount of 5 to 50 wt. % of a total amount of the rubber material and the thermoplastic resin.Type: GrantFiled: August 4, 2003Date of Patent: July 19, 2005Assignee: Tokai Rubber Industries, Ltd.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda, Kenichi Tsuchiya
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Publication number: 20050138810Abstract: A method of producing an electrically conductive roll having a proper crown shape at lower costs through a smaller number of process steps and without polishing. In this production method, a crown-shaped rubber layer is formed unitarily on a metal core by variably controlling the amount of a rubber material adhering on the metal core along the length of the metal core during extrusion of the rubber material.Type: ApplicationFiled: February 16, 2005Publication date: June 30, 2005Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda
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Publication number: 20050085361Abstract: A developing roll free from frequent occurrence of an imaging failure such as fog and excellent in durability. The developing roll comprises a shaft (1), a base rubber layer (2) provided on an outer peripheral surface of the shaft (1), and a surface layer (3) provided directly or indirectly via a layer on an outer peripheral surface of the base rubber layer, the surface layer being formed by a material comprising a matrix polymer and adipic acid ester plasticizer.Type: ApplicationFiled: October 21, 2004Publication date: April 21, 2005Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Masanori Ishida, Naoki Yamaguchi, Yasuyuki Hayasaki, Shoji Arimura
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Publication number: 20040082451Abstract: A method of producing an electrically conductive roll having a proper crown shape at lower costs through a smaller number of process steps and without polishing. In this production method, a crown-shaped rubber layer is formed unitarily on a metal core by variably controlling the amount of a rubber material adhering on the metal core along the length of the metal core during extrusion of the rubber material.Type: ApplicationFiled: October 23, 2003Publication date: April 29, 2004Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda
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Publication number: 20040062940Abstract: An electrically conductive roll which includes a shaft body and which includes at least a conductive elastic layer formed by extrusion on an outer circumferential surface of the shaft body, wherein the conductive elastic layer is formed of at least one conductive rubber composition which includes a rubber material, a thermoplastic resin having crosslinkable double bonds and a melting point in a range from 40° C. to 100° C., and at least one conductive agent, the thermoplastic resin being included in an amount of 5 to 50 wt. % of a total amount of the rubber material and the thermoplastic resin.Type: ApplicationFiled: August 4, 2003Publication date: April 1, 2004Applicant: Tokai Rubber Industries, Ltd.Inventors: Shiro Miyamori, Yasuyuki Hayasaki, Masanari Umeda, Kenichi Tsuchiya