Patents by Inventor Hayato YOSHIYASU
Hayato YOSHIYASU 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: 20230322025Abstract: Provided is a pneumatic tire that ensures sufficient steering stability even when a vehicle runs on a wet road surface at a high speed. The pneumatic tire has a tread portion formed of a rubber composition containing: a rubber component of styrene-butadiene rubber and isoprene-based rubber; and a resin component, wherein when Q (parts by mass) is the content of the resin component with respect to 100 parts by mass of the rubber component, the tire is installed on a standardized rim, the internal pressure is 250 kPa, Wt (mm) is the cross-sectional width of the tire, and Dt (mm) is the outer diameter, the content Q (parts by mass) of the resin component with respect to 100 parts by mass of the rubber component exceeds 25 parts by mass, and (formula 1) and (formula 2) are satisfied. 1600?(Dt2×?/4)/Wt?2827.4??(formula 1) Q/Wt>0.Type: ApplicationFiled: August 25, 2021Publication date: October 12, 2023Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato YOSHIYASU
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Patent number: 11602954Abstract: Provided are a rubber composition for tires that provides improved silica dispersion and fuel economy while maintaining good hardness, and a pneumatic tire including the rubber composition. The present invention relates to a rubber composition for tires, containing a rubber component, silica, and a silica dispersing agent represented by the following formula (I).Type: GrantFiled: April 16, 2019Date of Patent: March 14, 2023Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato Yoshiyasu
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Patent number: 11597822Abstract: The present invention provides a rubber composition for tires which provides improved abrasion resistance, and a pneumatic tire containing the rubber composition. The present invention relates to a rubber composition for tires containing a rubber component including at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber, the rubber composition containing, per 100 parts by mass of the rubber component, 3 to 250 parts by mass of a reinforcing filler and 0.2 to 10 parts by mass of a specific tetrazine compound.Type: GrantFiled: April 13, 2018Date of Patent: March 7, 2023Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takehiro Kitaura, Subaru Toya, Hayato Yoshiyasu, Hiroaki Yamada
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Publication number: 20230002592Abstract: A rubber composition that includes a rubber component, an inorganic fiber material, and a coupling agent. The inorganic fiber material is one or more inorganic fiber materials selected from the group consisting of a magnesium sulfate fiber, a calcium silicate fiber, a potassium titanate fiber, an aluminum borate fiber, and a glass fiber.Type: ApplicationFiled: October 19, 2020Publication date: January 5, 2023Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato YOSHIYASU
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Publication number: 20220389206Abstract: The present disclosure provides a tire having excellent enduring performance. The present disclosure relates to a tire including a tread containing a rubber composition, the rubber composition satisfying the following relationships 1) to 3) when measured within 180 days after vulcanization: 1) Hso/Hsa×100?95 wherein Hso: hardness at room temperature, Hsa: hardness at room temperature after heat treatment at 80° C. for 168 hours; 2) As/Ts×100?70 wherein Ts: sulfur content before acetone extraction, As: sulfur content after acetone extraction; and 3) Swell?330 wherein Swell: toluene swelling index.Type: ApplicationFiled: July 9, 2020Publication date: December 8, 2022Applicant: Sumitomo Rubber Industries, Ltd.Inventors: Ryota KITAGO, Daisuke SATO, Hayato YOSHIYASU, Akihiro TAKEUCHI
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Patent number: 11396590Abstract: The present invention provides a pneumatic tire achieving a balanced improvement in fuel economy, abrasion resistance, and wet grip performance. The present invention relates to a pneumatic tire, including a tread containing a tread rubber composition, the tread rubber composition containing a rubber component including 30% by mass or more of a styrene-butadiene rubber, the tread rubber composition containing, per 100 parts by mass of the rubber component: 80 to 150 parts by mass of silica; 0.1 to 3.0 parts by mass of a tetrazine compound of formula (1); and 50 parts by mass or less of a hydrocarbon resin having a SP value of 7.5 to 10.5, the styrene-butadiene rubber having a styrene content of 23% by mass or higher.Type: GrantFiled: April 13, 2018Date of Patent: July 26, 2022Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato Yoshiyasu
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Patent number: 11370899Abstract: The present invention provides a rubber composition for tires which provides a balanced improvement in ice performance, fuel economy, and abrasion resistance, and a pneumatic tire containing the rubber composition. The present invention relates to a rubber composition for tires containing a rubber component including at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber, the rubber composition containing, per 100 parts by mass of the rubber component, 10 to 120 parts by mass of silica, 0.2 to 10 parts by mass of a tetrazine compound of formula (1), and 1 to 50 parts by mass of a low-molecular-weight diene polymer having a weight average molecular weight of 200,000 or less.Type: GrantFiled: April 13, 2018Date of Patent: June 28, 2022Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato Yoshiyasu
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Publication number: 20210229497Abstract: Provided are a rubber composition for tires that provides improved silica dispersion and fuel economy while maintaining good hardness, and a pneumatic tire including the rubber composition. The present invention relates to a rubber composition for tires, containing a rubber component, silica, and a silica dispersing agent represented by the following formula (I).Type: ApplicationFiled: April 16, 2019Publication date: July 29, 2021Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato YOSHIYASU
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Patent number: 10907034Abstract: Provided is a pneumatic tire achieving a balanced improvement of steering stability, fuel economy, and processability. The pneumatic tire is formed from a rubber composition which includes: a rubber component; a plasticizer component; and a filler component. The rubber component includes: a diene rubber; and a copolymer containing an aromatic moiety as a structural unit derived from an aromatic vinyl compound and an ethylene moiety as a structural unit derived from ethylene. The ethylene moiety is present in an amount of 15 to 70% by mass based on 100% by mass of the total structural units of the copolymer excluding the aromatic moiety. The copolymer is present in an amount of 5 to 60% by mass based on 100% by mass of the rubber component. The rubber composition satisfies the following relationship: B/A=0.45 to 0.65.Type: GrantFiled: May 30, 2018Date of Patent: February 2, 2021Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yuhei Yamashiro, Hayato Yoshiyasu
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Publication number: 20200102448Abstract: The present invention provides a pneumatic tire achieving a balanced improvement in fuel economy, abrasion resistance, and wet grip performance. The present invention relates to a pneumatic tire, including a tread containing a tread rubber composition, the tread rubber composition containing a rubber component including 30% by mass or more of a styrene-butadiene rubber, the tread rubber composition containing, per 100 parts by mass of the rubber component: 80 to 150 parts by mass of silica; 0.1 to 3.0 parts by mass of a tetrazine compound of formula (1); and 50 parts by mass or less of a hydrocarbon resin having a SP value of 7.5 to 10.5, the styrene-butadiene rubber having a styrene content of 23% by mass or higher.Type: ApplicationFiled: April 13, 2018Publication date: April 2, 2020Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato YOSHIYASU
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Publication number: 20200048437Abstract: The present invention provides a rubber composition for tires which provides a balanced improvement in ice performance, fuel economy, and abrasion resistance, and a pneumatic tire containing the rubber composition. The present invention relates to a rubber composition for tires containing a rubber component including at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber, the rubber composition containing, per 100 parts by mass of the rubber component, 10 to 120 parts by mass of silica, 0.2 to 10 parts by mass of a tetrazine compound of formula (1), and 1 to 50 parts by mass of a low-molecular-weight diene polymer having a weight average molecular weight of 200,000 or less.Type: ApplicationFiled: April 13, 2018Publication date: February 13, 2020Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Hayato YOSHIYASU
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Publication number: 20200024432Abstract: The present invention provides a rubber composition for tires which provides improved abrasion resistance, and a pneumatic tire containing the rubber composition. The present invention relates to a rubber composition for tires containing a rubber component including at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber, the rubber composition containing, per 100 parts by mass of the rubber component, 3 to 250 parts by mass of a reinforcing filler and 0.2 to 10 parts by mass of a specific tetrazine compound.Type: ApplicationFiled: April 13, 2018Publication date: January 23, 2020Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Takehiro KITAURA, Subaru TOYA, Hayato YOSHIYASU, Hiroaki YAMADA
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Publication number: 20190315944Abstract: Provided are a rubber composition for tires that provides improved silica dispersion and fuel economy while maintaining good hardness, and a pneumatic tire including the rubber composition.Type: ApplicationFiled: October 11, 2017Publication date: October 17, 2019Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Hiroaki YAMADA, Hayato YOSHIYASU
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Publication number: 20190010313Abstract: Provided is a pneumatic tire achieving a balanced improvement of steering stability, fuel economy, and processability. The pneumatic tire is formed from a rubber composition which includes: a rubber component; a plasticizer component; and a filler component. The rubber component includes: a diene rubber; and a copolymer containing an aromatic moiety as a structural unit derived from an aromatic vinyl compound and an ethylene moiety as a structural unit derived from ethylene. The ethylene moiety is present in an amount of 15 to 70% by mass based on 100% by mass of the total structural units of the copolymer excluding the aromatic moiety. The copolymer is present in an amount of 5 to 60% by mass based on 100% by mass of the rubber component. The rubber composition satisfies the following relationship: B/A=0.45 to 0.65.Type: ApplicationFiled: May 30, 2018Publication date: January 10, 2019Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Yuhei YAMASHIRO, Hayato YOSHIYASU