Patents by Inventor Takanobu Kawamura
Takanobu Kawamura 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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Publication number: 20230338781Abstract: An object of the present disclosure is to provide a golf ball having good shot feeling and excellent durability while having non-lowered resilience. The present disclosure provides a golf ball comprising a spherical core and one or more cover layers disposed outside the spherical core, wherein at least one layer of the cover layers contains (A) a base resin and (B) a polyethylene oxide.Type: ApplicationFiled: April 21, 2023Publication date: October 26, 2023Applicant: Sumitomo Rubber Industries, Ltd.Inventors: Ayaka SHINDO, Takahiro SHIGEMITSU, Kazuyoshi SHIGA, Toshiyuki TARAO, Takanobu KAWAMURA
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Publication number: 20230201670Abstract: An object of the present disclosure is to provide a golf ball having good shot feeling and excellent durability and not having lowered resilience even if a hard cover material is used. The present disclosure provides a golf ball comprising a spherical core, and a cover disposed outside the spherical core and composed of one or more layers, wherein at least one cover layer contains (A) a base resin, and (B) at least one member selected from the group consisting of a polyrotaxane, a polyethylene oxide, a polypropylene oxide, a polycaprolactone and a liquid polymer, and Sa×Spc?100 wherein Sa (?m) is an arithmetic mean roughness of a surface of a cut plane of the cover, and Spc (mm?1) is an arithmetic mean curvature of a summit of the surface of the cut plane of the cover.Type: ApplicationFiled: December 8, 2022Publication date: June 29, 2023Applicant: Sumitomo Rubber Industries, Ltd.Inventors: Ayaka SHINDO, Takahiro SHIGEMITSU, Kazuyoshi SHIGA, Toshiyuki TARAO, Takanobu KAWAMURA
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Publication number: 20220063351Abstract: Provided is a run-flat tire having improved durability performance during travel while the tire is running flat. A surface section of a sidewall of the run-flat tire is provided with an uneven section. A sidewall reinforcement layer is configured such that a breaking strength TB (MPa) at 100° C.×an elongation at break EB (%) is 320 or more and a loss tangent 100° C. tan ? at 100° C. is 0.06 or less, and the sidewall is configured such that a loss tangent 60° C. tan ? at 60° C. is 0.17 or less and |60° C. tan ??75° C. tan ?| is less than 0.05.Type: ApplicationFiled: January 21, 2020Publication date: March 3, 2022Applicant: Sumitomo Rubber Industries, Ltd.Inventors: Daichi AOKI, Mutsuki SUGIMOTO, Takanobu KAWAMURA
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Publication number: 20190315965Abstract: The present invention aims to provide a wax capable of improving discoloration resistance while maintaining excellent ozone resistance over a wide range of ambient temperatures; a rubber composition containing the wax; and a pneumatic tire containing the rubber composition. The present invention relates to a wax having a ratio of (A) the total amount of C23-C32 normal alkanes to (B) the total amount of C33-C40 normal alkanes (A/B) of 1.7 to 6.Type: ApplicationFiled: December 18, 2017Publication date: October 17, 2019Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Tomoko KONISHI, Takanobu KAWAMURA
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Patent number: 9267901Abstract: The present invention provides a method for estimating breaking energy of a rubber material, in particular breaking energy of a surface of a rubber material. The present invention also provides to a rubber composition excellent in crack resistance. The present invention relates to a method for estimating breaking energy of a rubber material, including determining a carbon-carbon double bond content in the rubber material.Type: GrantFiled: January 13, 2014Date of Patent: February 23, 2016Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Fusae Kaneko, Takanobu Kawamura
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Publication number: 20140211915Abstract: The present invention provides a method for estimating breaking energy of a rubber material, in particular breaking energy of a surface of a rubber material. The present invention also provides to a rubber composition excellent in crack resistance. The present invention relates to a method for estimating breaking energy of a rubber material, including determining a carbon-carbon double bond content in the rubber material.Type: ApplicationFiled: January 13, 2014Publication date: July 31, 2014Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Fusae KANEKO, Takanobu KAWAMURA
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Patent number: 5708083Abstract: A polyolefin resin composition is disclosed which comprises(a) a crystalline propylene polymer in an amount of 40% or more to less than 95% by weight,(b) an ethylene/.alpha.-olefin rubber in an amount of from 5 to 40% by weight, and(c) a linear or branched specified block copolymer in an amount of from 0.1 to 20% by weight containing a polyethylene block segment A having a melting temperature as measured with a differential scanning calorimeter of from 80.degree. to 120.degree. C. and an ethylene/.alpha.-olefin copolymer block segment B,the total content of components (a), (b), and (c) being 100% by weight, which composition has excellent dispersibility of the rubber used, so that moldings having an excellent balance between rigidity and impact resistance are obtained therefrom, and is hence suitable for use in the field of moldings required to have rigidity and impact resistance.Type: GrantFiled: February 13, 1997Date of Patent: January 13, 1998Inventors: Takanobu Kawamura, Katsuhiko Ohno, Osamu Kojima, Kouichi Hatada, Shinei Gima, Takao Nomura, Takeyoshi Nishio
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Patent number: 5319016Abstract: An emulsion adhesive composition is provided which comprises: (i) an aqueous elmusion of a adhesive synthetic resin and (ii) a solution of an organic solvent and a polyolefin and/or a hydrogenated block copolymer composed of an aromatic vinyl compound and an aliphatic diene polymer blocks, and each of the polyolefin and the hydrogenated block copolymer contains at least one functional group selected from carboxylic anhydride carboxyl, glycidyl, hydroxyl, amido and alkoxysilyl groups. A photostabilizer may be incorporated into the composition in which said component (ii) may contain chloro.The emulsion adhesive composition can be used for adhering a highly crystalline resin molded article to an optional material without a complicated surface treatment, and can have a light resistance and storing stability.Type: GrantFiled: February 25, 1993Date of Patent: June 7, 1994Assignee: Chisso CorporationInventors: Jun Saito, Toshimori Nakai, Sinzi Chiku, Takanobu Kawamura, Kazuo Ito, Yoshiro Umemoto
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Patent number: 4843125Abstract: A molding thermoplastic, elastomeric resin composition having superior flexibility, impact resistance, mechanical strengths and moldability is provided, which composition comprises (1) a block copolymer expressed by the formula B--A--B' (wherein A is a conjugated diene polymer block and B and B' each are an aromatic vinyl compound polymer block of a specified molecular weight and are the same or different and contained in the copolymer in a specified proportion); a non-crystalline ethylene-.alpha.-olefin random copolymer; a propylene-ethylene block copolymer and/or a crystalline propylene-ethylene random copolymer; and a specified phenolic antioxidant, or (2) a specified proportion of a hydrogenated derivative of a block copolymer expressed by the formula B--A--B' wherein A, B and B' are as defined above, and having a specified solution viscosity and a specified proportion of a crystalline propylene-ethylene random copolymer having a specified flexural modulus.Type: GrantFiled: January 21, 1988Date of Patent: June 27, 1989Assignee: Chisso CorporationInventors: Takanobu Kawamura, Tamihiro Oohashi, Shinji Chiku
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Patent number: 4777203Abstract: A molding thermoplastic, elastomeric resin composition having superior flexibility, impact resistance, mechanical strengths and moldability is provided, which composition comprises (1) a block copolymer expressed by the formula B-A-B' (wherein A is a conjugated diene polymer block and B and B' each are an aromatic vinyl compound polymer block of a specified molecular weight and are the same or different and contained in the copolymer in a specified proportion); a non-crystalline ehtylene-.alpha.-olefin random copolymer; a propylene-ethylene block coplymer and/or a crystalline propylene-ethylene random copolymer; and a specified phenolic antioxidant, or (2) a specified proportion of a hydrogenated derivative of a block copolymer expressed by the formula B-A-B' wherein A, B and B' are as defined above, and having a specified solution viscosity and a specified proportion of a crystalline propylene-ethylene random copolymer having a specified flexural modulus.Type: GrantFiled: March 12, 1987Date of Patent: October 11, 1988Assignee: Chisso CorporationInventors: Takanobu Kawamura, Tamihiro Oohashi, Shinji Chiku
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Patent number: 4775711Abstract: A molding elastomeric composition having superior flexibility, high-impact properties, high mechanical strengths (particularly, flexural modulus), good moldability (particularly, mold-release characteristics) and appearance of the resulting molded products is provided, the composition being obtained (a) by blending a specified proportion of a specified hydrogenated styrene-butadiene-styrene block copolymer having a specified solution viscosity, with a propylene copolymer of a propylene-ethylene block copolymer (I) with a crystalline propylene-ethylene random copolymer (II) in a specified blending ratio; or (b) by blending the specified proportion of the hydrogenated material and a specified proportion of a non-crystalline ethylene-.alpha.-olefin random copolymer with the propylene copolymer of (I) with (II); or (c) by blending a specified proportion of the propylene copolymer of (I) with (II), a specified proportion of the hydrogenated material, a specified proportion of the non-crystalline ethylene-.alpha.Type: GrantFiled: April 2, 1987Date of Patent: October 4, 1988Assignee: Chisso CorporationInventors: Takanobu Kawamura, Tamihiro Oohashi, Shinji Chiku