Patents by Inventor Tetsuya Kunisawa
Tetsuya Kunisawa 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: 11433705Abstract: A studless tire having a tread composed of a rubber composition for a tread comprising 1 to 20 parts by mass of a farnesene resin and 1 to 20 parts by mass of a terpene resin based on 100 parts by mass of a rubber component.Type: GrantFiled: February 27, 2018Date of Patent: September 6, 2022Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Tetsuya Kunisawa, Shuichiro Ono, Kenichi Uesaka, Seiji Hatano
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Publication number: 20220176744Abstract: The present invention aims to provide tires which provide improved overall performance in terms of fuel economy, life performance, wet grip performance, and handling stability. The present invention relates to a tire including a tread, the tread containing a rubber component, a silica having a nitrogen adsorption specific surface area of 200 m2/g or more, and a softener, the tread satisfying the following relationship (A): 0.25?total silica content(parts by mass)/(total softener content(parts by mass)×main groove depth(mm))?0.60.Type: ApplicationFiled: February 12, 2020Publication date: June 9, 2022Applicant: Sumitomo Rubber Industries, Ltd.Inventor: Tetsuya KUNISAWA
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Patent number: 10766305Abstract: The present invention provides a pneumatic tire that achieves a balanced improvement in fuel economy, wet grip performance, handling stability, abrasion resistance, fatigue resistance, and tensile strength. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition having after vulcanization rubber properties satisfying certain values.Type: GrantFiled: November 17, 2015Date of Patent: September 8, 2020Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Tetsuya Kunisawa
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Patent number: 10538129Abstract: The purpose of the present invention is to provide a rubber composition for a base tread being excellent in fuel efficiency. In the rubber composition for a base tread, a dynamic elastic modulus E* (MPa) and a loss tangent tan ? which are measured at a temperature of 70° C., an initial strain of 10% and a dynamic strain of 2% satisfy the following general formulae (1) to (3), and a strength at break TB (MPa) and an elongation at break EB (%) which are measured according to JIS K6251 satisfy the following general formulae (4) and (5). E*/tan ??25??General formula (1) 2.0?E*?8.0??General formula (2) tan ??0.Type: GrantFiled: September 5, 2017Date of Patent: January 21, 2020Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Tetsuya Kunisawa
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Publication number: 20200009914Abstract: A studless tire having a tread composed of a rubber composition for a tread comprising 1 to 20 parts by mass of a farnesene resin and 1 to 20 parts by mass of a terpene resin based on 100 parts by mass of a rubber component.Type: ApplicationFiled: February 27, 2018Publication date: January 9, 2020Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Tetsuya KUNISAWA, Shuichiro ONO, Kenichi UESAKA, Seiji HATANO
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Publication number: 20190390042Abstract: The present invention provides a tire rubber composition which provides significantly improved wet grip performance, and a pneumatic tire including the rubber composition. The present invention relates to a rubber composition for treads containing: a rubber component including a styrene butadiene rubber; a fine particle silica having a particle size of 18 nm or less; and a silane coupling agent containing an alkoxysilyl group and a sulfur atom wherein the number of carbon atoms linking the alkoxysilyl group to the sulfur atom is six or more, the rubber composition satisfying A×B?3000 wherein A and B represent the total masses of silica and styrene, respectively, expressed in parts by mass per 100 parts by mass of the rubber component.Type: ApplicationFiled: February 2, 2018Publication date: December 26, 2019Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Tetsuya KUNISAWA
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Patent number: 10316164Abstract: The tire of the present invention is a tire having an inner liner composed of a rubber composition for an inner liner which is excellent in steering stability, fuel efficiency and a balance of physical properties while maintaining air permeation resistance and durability. The rubber composition for an inner liner comprises a rubber component and additives, wherein E* (MPa) and tan ? measured at a temperature of 70° C., an initial strain of 10% and a dynamic strain of 2% satisfy the following formulas (1) to (3), an air permeation coefficient is not more than 12.00×10?14 cm3·cm/(cm2·s·Pa), and TB (MPa) and EB (%) as measured in accordance with JIS K6251 satisfy the following formulas (4) and (5). E*/tan ?>17??Formula (1): 2.5<E*<5??Formula (2): tan ?<0.Type: GrantFiled: November 5, 2015Date of Patent: June 11, 2019Assignee: SUMITOMO RUBBER INDUSTRIES, LTDInventors: Tetsuya Kunisawa, Yuka Yokoyama
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Publication number: 20180093529Abstract: The purpose of the present invention is to provide a rubber composition for a base tread being excellent in fuel efficiency. In the rubber composition for a base tread, a dynamic elastic modulus E* (MPa) and a loss tangent tan ? which are measured at a temperature of 70° C., an initial strain of 10% and a dynamic strain of 2% satisfy the following general formulae (1) to (3), and a strength at break TB (MPa) and an elongation at break EB (%) which are measured according to JIS K6251 satisfy the following general formulae (4) and (5). E*/tan ??25??General formula (1) 2.0?E*?8.0??General formula (2) tan ??0.Type: ApplicationFiled: September 5, 2017Publication date: April 5, 2018Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Tetsuya KUNISAWA
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Patent number: 9932460Abstract: The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, and abrasion resistance in a balanced manner, and a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a liquid resin having a softening point of ?20 to 20° C., wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; and an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component.Type: GrantFiled: April 20, 2012Date of Patent: April 3, 2018Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Isamu Tsumori, Kenichi Uesaka, Naoya Omura, Tetsuya Kunisawa, Tatsuhiro Tanaka, Kazuyuki Nishioka
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Publication number: 20170267027Abstract: The present invention provides a pneumatic tire that achieves a balanced improvement in fuel economy, wet grip performance, handling stability, abrasion resistance, fatigue resistance, and tensile strength. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition having after vulcanization rubber properties satisfying certain values.Type: ApplicationFiled: November 17, 2015Publication date: September 21, 2017Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Tetsuya KUNISAWA
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Publication number: 20160152792Abstract: The tire of the present invention is a tire having an inner liner composed of a rubber composition for an inner liner which is excellent in steering stability, fuel efficiency and a balance of physical properties while maintaining air permeation resistance and durability. The rubber composition for an inner liner comprises a rubber component and additives, wherein E* (MPa) and tan ? measured at a temperature of 70° C., an initial strain of 10% and a dynamic strain of 2% satisfy the following formulas (1) to (3), an air permeation coefficient is not more than 12.00×10?14 cm3·cm/(cm2·s·Pa), and TB (MPa) and EB (%) as measured in accordance with JIS K6251 satisfy the following formulas (4) and (5). E*/tan ?>17 ??Formula (1): 2.5<E*<5 ??Formula (2): tan ?<0.Type: ApplicationFiled: November 5, 2015Publication date: June 2, 2016Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Tetsuya Kunisawa, Yuka Yokoyama
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Patent number: 9315647Abstract: The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, abrasion resistance, and processability in a balanced manner, and also provides a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a compound represented by formula (1) below, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; and an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component.Type: GrantFiled: March 23, 2012Date of Patent: April 19, 2016Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoji Imoto, Kenichi Uesaka, Takafumi Taguchi, Naoya Omura, Tetsuya Kunisawa, Satomi Yamauchi
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Patent number: 9012560Abstract: The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, and abrasion resistance in a balanced manner, and a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a silane coupling agent, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component; and the silane coupling agent contains a mercapto group.Type: GrantFiled: March 22, 2012Date of Patent: April 21, 2015Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Tetsuya Kunisawa, Tsuyoshi Tsuchida, Kenichi Uesaka, Isamu Tsumori, Reika Otake, Noboru Okabe, Naoya Omura, Tatsuhiro Tanaka, Takafumi Taguchi, Kenya Watanabe, Toru Iizuka
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Patent number: 8869856Abstract: A pneumatic tire capable of reducing rolling resistance and discharging static electricity generated during running, wherein each of a tread rubber, a breaker rubber, and a sidewall rubber formed on the tread part, the breaker part, and the sidewall part, respectively, has a volume specific resistivity of 1×108 ?·cm or more, the pneumatic tire further including a conduction rubber embedded in the tread part so as to be at least partially exposed to a surface of the tread part, bead part rubber disposed at a region contacting a rim flange of the bead part, and electroconductive rubber electrically connecting the conduction rubber to the beat part rubber, wherein each of the conduction rubber, the bead part rubber, and the electroconductive rubber has a volume specific resistivity of less than 108 ?·cm.Type: GrantFiled: June 2, 2008Date of Patent: October 28, 2014Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Tetsuya Kunisawa, Keiichi Nakadera, Toru Iizuka, Takao Wada, Shinichi Miyazaki, Toshiro Matsuo
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Publication number: 20140299241Abstract: A pneumatic tire capable of reducing rolling resistance and discharging static electricity generated during running, wherein each of a tread rubber, a breaker rubber, and a sidewall, respectively, has a volume specific resistivity of 1×108 ?·cm or more, the pneumatic tire further including a conduction rubber embedded in the tread part so as to be at least partially exposed to a surface of the tread part, a coating rubber disposed on the upper part of the breaker part, a bead part rubber, and side part electroconductive rubber electrically connecting the conduction rubber to the beat part rubber, wherein each of the conduction rubber, the bead part rubber, the coating rubber and the side part electroconductive rubber has a volume specific resistivity of less than 108 ?·cm.Type: ApplicationFiled: June 19, 2014Publication date: October 9, 2014Inventors: Tetsuya KUNISAWA, Keiichi NAKADERA
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Publication number: 20130345337Abstract: The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, and abrasion resistance in a balanced manner, and a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a liquid resin having a softening point of ?20 to 20° C., wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; and an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component.Type: ApplicationFiled: April 20, 2012Publication date: December 26, 2013Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Isamu Tsumori, Kenichi Uesaka, Naoya Omura, Tetsuya Kunisawa, Tatsuhiro Tanaka, Kazuyuki Nishioka
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Patent number: 8614272Abstract: The invention aims to provide a tire rubber composition that is excellent in the low heat build-up property (fuel economy), wet grip performance, and abrasion resistance, and can be suitably used for a tread (cap tread); and a tire rubber composition that is excellent in the low heat build-up property and breaking properties, and can be suitably used for a base tread or sidewall.Type: GrantFiled: April 4, 2011Date of Patent: December 24, 2013Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Kenichi Uesaka, Tetsuya Kunisawa
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Publication number: 20130338296Abstract: The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, and abrasion resistance in a balanced manner, and a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a compound represented by formula (1) below, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; and an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component.Type: ApplicationFiled: April 26, 2012Publication date: December 19, 2013Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takahiro Mabuchi, Yoshihiro Kagawa, Hiroshi Ito, Tetsuya Kunisawa, Isamu Tsumori, Kenichi Uesaka
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Publication number: 20130310512Abstract: The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, abrasion resistance, and processability in a balanced manner, and also provides a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a compound represented by formula (1) below, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; and an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component.Type: ApplicationFiled: March 23, 2012Publication date: November 21, 2013Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yoji Imoto, Kenichi Uesaka, Takafumi Taguchi, Naoya Omura, Tetsuya Kunisawa, Satomi Yamauchi
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Publication number: 20130303679Abstract: The present invention provides a rubber composition that can enhance the fuel economy, wet-grip performance, and abrasion resistance in a balanced manner, and a pneumatic tire using this rubber composition. The present invention relates to a rubber composition that contains a rubber component, silica, and a silane coupling agent, wherein the rubber component contains, based on 100% by mass of the rubber component, not less than 5% by mass of a conjugated diene polymer containing a constituent unit based on a conjugated diene and a constituent unit represented by formula (I) below, at least one terminal of the polymer being modified with a specific compound; an amount of the silica is 5 to 150 parts by mass per 100 parts by mass of the rubber component; and the silane coupling agent contains a mercapto group.Type: ApplicationFiled: March 22, 2012Publication date: November 14, 2013Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Tetsuya Kunisawa, Tsuyoshi Tsuchida, Kenichi Uesaka, Isamu Tsumori, Reika Otake, Noboru Okabe, Naoya Omura, Tatsuhiro Tanaka, Takafumi Taguchi, Kenya Watanabe, Toru Iizuka