Patents by Inventor Katsumasa Yamamoto
Katsumasa Yamamoto 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: 11603466Abstract: Provided is an epoxy resin composition that can achieve excellent low dielectric characteristics and high adhesive strength to metal. Specifically, provided is an epoxy resin composition comprising organic fine particles and an epoxy resin having a specific structure.Type: GrantFiled: January 9, 2018Date of Patent: March 14, 2023Assignee: SUMITOMO SEIKA CHEMICALS CO.. LTD.Inventors: Noriaki Fukuda, Ryota Harisaki, Katsumasa Yamamoto
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Publication number: 20220267653Abstract: There is provided an adhesive composition having both high adhesion force and stable adhesion performance. An adhesive composition comprising, per 100 parts by mass of a curable resin (A), 1 part by mass or more and 80 parts by mass or less of substantially spherical organic particles (B), wherein the adhesive composition is used in an application amount of 5 mg/cm2 or more and 500 mg/cm2 or less on an adherend.Type: ApplicationFiled: May 20, 2020Publication date: August 25, 2022Inventors: Kairi Kakutaka, Katsumasa Yamamoto
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Publication number: 20220243001Abstract: Provided is an epoxy resin composition that gives a cured product having excellent adhesion to metal and low dielectric characteristics, and that has good workability during use and high storage stability. Specifically, provided is an epoxy resin composition comprising a specific epoxy resin and a specific phenol-based curing agent.Type: ApplicationFiled: June 15, 2020Publication date: August 4, 2022Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Ryota HARISAKI, Katsumasa YAMAMOTO
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Publication number: 20220106420Abstract: An aspect of the present invention provides a curable resin composition containing (A) a vinyl sulfide compound represented by general formula (1) and (B) an isocyanate compound having an isocyanate group. In formula (1), R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, and R16 may be the same or different from one another, and represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms, and n represents an integer of 0 to 10.Type: ApplicationFiled: January 21, 2020Publication date: April 7, 2022Inventors: Yusaku MASUHARA, Takuro ASABA, Katsumasa YAMAMOTO
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Patent number: 11292872Abstract: Provided is an epoxy resin composition maintaining excellent adhesion and having low dielectric tangent. Specifically, provided is an epoxy resin composition comprising a specific epoxy resin and a phenol-based curing agent.Type: GrantFiled: January 9, 2018Date of Patent: April 5, 2022Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Ryota Harisaki, Noriaki Fukuda, Katsumasa Yamamoto
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Patent number: 11111382Abstract: Provided is an epoxy resin composition having excellent low dielectric characteristics. Specifically, provided is an epoxy resin composition comprising a polyphenylene ether and an epoxy resin having a specific structure.Type: GrantFiled: January 9, 2018Date of Patent: September 7, 2021Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki Fukuda, Ryota Harisaki, Katsumasa Yamamoto
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Patent number: 11091627Abstract: Provided is an epoxy resin composition having excellent adhesion and low dielectric characteristics. Specifically, provided is an epoxy resin composition comprising an acid-modified polyolefin resin and an epoxy resin having a specific structure.Type: GrantFiled: January 9, 2018Date of Patent: August 17, 2021Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki Fukuda, Ryota Harisaki, Katsumasa Yamamoto
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Patent number: 11066510Abstract: The present invention provides an epoxy resin composition that can produce a cured product maintaining good dielectric characteristics (low dielectric constant and low dielectric loss tangent), and having high adhesion strength to metal; and also provides a process for producing the same, a cured product obtained by curing the epoxy resin composition, and use thereof. The present invention includes an epoxy resin composition comprising an epoxy resin, an acid anhydride-based curing agent, and a curing accelerator, the epoxy resin being represented by the formula (1): wherein X is a divalent group obtained by removing two hydrogen atoms from a hydrocarbon ring, or a divalent group represented by the formula (2): wherein Y is a bond, a C1-6 alkylene group, etc.; R1 is the same or different, and is a C1-18 alkyl group, etc., R2 is the same or different, and is a C1-18 alkylene group, etc., R3 is the same or different, and is a C1-18 alkyl group, etc.Type: GrantFiled: May 22, 2020Date of Patent: July 20, 2021Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki Fukuda, Ryota Harisaki, Katsumasa Yamamoto, Nobukatsu Nemoto
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Publication number: 20200385565Abstract: Provided is an epoxy resin composition that can achieve excellent low dielectric characteristics and high adhesive strength to metal. Specifically, provided is an epoxy resin composition comprising organic fine particles and an epoxy resin having a specific structure.Type: ApplicationFiled: January 9, 2018Publication date: December 10, 2020Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO
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Publication number: 20200385514Abstract: Provided is an epoxy resin composition that has excellent electric characteristics (particularly low dielectric tangent), and that can achieve high adhesive strength to metal. Specifically, provided is an epoxy resin composition comprising an active ester compound and an epoxy resin having a specific structure.Type: ApplicationFiled: January 9, 2018Publication date: December 10, 2020Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO
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Publication number: 20200283566Abstract: The present invention provides an epoxy resin composition that can produce a cured product maintaining good dielectric characteristics (low dielectric constant and low dielectric loss tangent), and having high adhesion strength to metal; and also provides a process for producing the same, a cured product obtained by curing the epoxy resin composition, and use thereof. The present invention includes an epoxy resin composition comprising an epoxy resin, an acid anhydride-based curing agent, and a curing accelerator, the epoxy resin being represented by the formula (1): wherein X is a divalent group obtained by removing two hydrogen atoms from a hydrocarbon ring, or a divalent group represented by the formula (2): wherein Y is a bond, a C1-6 alkylene group, etc.; R1 is the same or different, and is a C1-18 alkyl group, etc., R2 is the same or different, and is a C1-18 alkylene group, etc., R3 is the same or different, and is a C1-18 alkyl group, etc.Type: ApplicationFiled: May 22, 2020Publication date: September 10, 2020Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO, Nobukatsu NEMOTO
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Publication number: 20200115554Abstract: Provided are an epoxy resin composition that can achieve a sufficiently low viscosity without using a diluent (an organic solvent), and a method for producing the same. Also provided are an epoxy resin composition that can preferably achieve, when cured, good electrical characteristics (particularly low dielectric constant and low dielectric loss tangent), high adhesion strength to metal, and good water absorption characteristics; and a method for producing the same.Type: ApplicationFiled: December 16, 2019Publication date: April 16, 2020Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO, Nobukatsu NEMOTO
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Publication number: 20190359822Abstract: Provided is an epoxy resin composition having excellent low dielectric characteristics. Specifically, provided is an epoxy resin composition comprising a polyphenylene ether and an epoxy resin having a specific structure.Type: ApplicationFiled: January 9, 2018Publication date: November 28, 2019Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO
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Publication number: 20190352448Abstract: Provided is an epoxy resin composition maintaining excellent adhesion and having low dielectric tangent. Specifically, provided is an epoxy resin composition comprising a specific epoxy resin and a phenol-based curing agent.Type: ApplicationFiled: January 9, 2018Publication date: November 21, 2019Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Ryota HARISAKI, Noriaki FUKUDA, Katsumasa YAMAMOTO
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Publication number: 20190322858Abstract: Provided is an epoxy resin composition having excellent adhesion and low dielectric characteristics. Specifically, provided is an epoxy resin composition comprising an acid-modified polyolefin resin and an epoxy resin having a specific structure.Type: ApplicationFiled: January 9, 2018Publication date: October 24, 2019Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO
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Publication number: 20190119434Abstract: The present invention provides an epoxy resin composition that can produce a cured product maintaining good dielectric characteristics (low dielectric constant and low dielectric loss tangent), and having high adhesion strength to metal; and also provides a process for producing the same, a cured product obtained by curing the epoxy resin composition, and use thereof. The present invention includes an epoxy resin composition comprising an epoxy resin, an acid anhydride-based curing agent, and a curing accelerator, the epoxy resin being represented by the formula (1): wherein X is a divalent group obtained by removing two hydrogen atoms from a hydrocarbon ring, or a divalent group represented by the formula (2): wherein Y is a bond, a C1-6 alkylene group, etc.; R1 is the same or different, and is a C1-18 alkyl group, etc., R2 is the same or different, and is a C1-18 alkylene group, etc., R3 is the same or different, and is a C1-18 alkyl group, etc.Type: ApplicationFiled: July 7, 2016Publication date: April 25, 2019Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO, Nobukatsu NEMOTO
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Publication number: 20180327595Abstract: Provided are an epoxy resin composition that can achieve a sufficiently low viscosity without using a diluent (an organic solvent), and a method for producing the same. Also provided are an epoxy resin composition that can preferably achieve, when cured, good electrical characteristics (particularly low dielectric constant and low dielectric loss tangent), high adhesion strength to metal, and good water absorption characteristics; and a method for producing the same.Type: ApplicationFiled: November 17, 2016Publication date: November 15, 2018Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Noriaki FUKUDA, Ryota HARISAKI, Katsumasa YAMAMOTO, Nobukatsu NEMOTO
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Patent number: 9963552Abstract: The present invention aims to provide a condensation-curable silicone resin composition with excellent adhesion properties. The present invention also aims to provide a condensation-curable silicone resin cured product formed from the condensation-curable silicone resin composition and a sealed optical semiconductor element formed by using the condensation-curable silicone resin composition.Type: GrantFiled: May 26, 2014Date of Patent: May 8, 2018Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Noriaki Fukuda, Katsumasa Yamamoto
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Patent number: 9783717Abstract: The invention aims to provide an addition curable silicone resin composition with excellent interfacial adhesion properties, storage stability and transparency. The addition curable silicone resin mixtures has a refractive index of 1.35 to 1.Type: GrantFiled: June 27, 2014Date of Patent: October 10, 2017Assignee: Sumitomo Seika Chemicals Co., Ltd.Inventors: Noriaki Fukuda, Shohei Sanada, Katsumasa Yamamoto
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Publication number: 20160194537Abstract: The present invention aims to provide an addition-curable silicone resin composition with excellent interfacial adhesion properties, storage stability, and transparency. The present invention also aims to provide an addition-curable silicone resin cured product formed from the addition-curable silicone resin composition and a sealed optical semiconductor element formed by using the addition-curable silicone resin composition. The present invention is an addition-curable silicone resin composition including: an addition-curable silicone resin mixture; and an adhesion-imparting agent, the addition-curable silicone resin mixture having a refractive index of 1.35 to 1.45, the adhesion-imparting agent including a compound that includes a structural unit represented by the formula (1-3) and/or a structural unit represented by the formula (1-4) between a structural unit represented by the formula (1-1) and a structural unit represented by the formula (1-2), the compound having a refractive index of 1.35 to 1.Type: ApplicationFiled: June 27, 2014Publication date: July 7, 2016Inventors: Noriaki FUKUDA, Shohei SANADA, Katsumasa YAMAMOTO