Patents by Inventor Masaki OSHIMO
Masaki OSHIMO 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: 20230322026Abstract: Provided is a heavy duty tire having excellent chipping resistance during high-speed running. Included is a heavy duty tire including a tread portion, the tread portion including a shoulder region located axially outward from an axially outermost main longitudinal groove extending in a circumferential direction, the tread portion being provided with a tread rubber consisting of a multilayer structure including a cap rubber layer forming a tread outer surface and a radially innermost base rubber layer, the cap rubber layer in the shoulder region containing at least one rubber component including a polybutadiene rubber and a carbon black, the heavy duty tire satisfying the following relationships (1) to (3): (1) Tb/Tc ? 0.50; (2) Eb?/Ec? ? 0.60; and (3) Bca/(Tb/Tc) ? 40 wherein Tc, Ec?, Tb, Eb? and Bca are defined herein.Type: ApplicationFiled: September 28, 2022Publication date: October 12, 2023Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, Kento HISAJIMA
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Publication number: 20230286325Abstract: A tire having a tread composed of a rubber composition that includes a rubber component, wherein the tread has at least one circumferential main groove extending continuously in a tire circumferential direction, wherein, at a bending part in a plurality, the circumferential main groove bends and extends in the tire circumferential direction such that a center line of the circumferential main groove deviates in a tire width direction or an extending direction of the center line of the circumferential main groove changes preceding and following the bending part, and wherein the rubber composition has tan ? at 20° C. (20° C. tan ?) of 0.30 or less, and breaking strength TB (MPa) at 175° C. and elongation at break EB (%) at 175° C. satisfying a relational expression of TB x EB/2 ? 600.Type: ApplicationFiled: July 20, 2021Publication date: September 14, 2023Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, You TOSHIMA
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Publication number: 20220371372Abstract: Provided is a pneumatic tire having excellent abrasion resistance and excellent handling stability on an extremely cold road while having a reduced weight. The present disclosure relates to a pneumatic tire, including a tread having a hardness at ?20° C. of 90 or less, a hardness at 30° C. of 60 or more, and a maximum thickness of 8.5 mm or less, and a carcass including one carcass ply.Type: ApplicationFiled: May 7, 2020Publication date: November 24, 2022Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, Ryoji MATSUI, Toshiaki HAMADA
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Publication number: 20220194126Abstract: An object of the present disclosure is to provide a tire having improved overall performance of fuel efficiency, breaking resistance, and abrasion resistance. The tire comprises a tread, wherein a cap rubber layer of an outer surface of the tread is formed of a rubber composition comprising a rubber component having a total content of 90% by mass or more of an isoprene-based rubber and a butadiene rubber and silica having a nitrogen adsorption specific surface area (N2SA) of 180 m2/g or more, wherein a total cis content in the butadiene rubber is less than 90% by mass, wherein a tan ? at 70° C. of the rubber composition of the cap rubber layer is less than 0.15, wherein the tread has circumferential grooves extending continuously in a tire circumferential direction and lateral grooves extending in a tire width direction, and wherein a ratio of a total area S2 of the lateral grooves to a total area S1 of the circumferential grooves (S2/S1) is less than 0.80.Type: ApplicationFiled: November 29, 2021Publication date: June 23, 2022Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Masaki OSHIMO
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Patent number: 10435546Abstract: A pneumatic tire having a tire component prepared by use of a rubber composition according to the present invention which comprises: a polybitadiene (i) which satisfies conditions of (A) a Mooney viscosity (ML1+4, 100° C.) of 43 to 70, (B) a ratio (Tcp/ML1+4, 100° C.) of 5% by mass toluene solution viscosity (Tcp) to Mooney viscosity (ML1+4, 100° C.) of 0.9 to 1.7, (C) a stress relaxation time (T80), being a time until a torque is attenuated by 80% assuming that the torque at the end of ML1+4, 100° C. measurement is 100%, of 10.0 to 40.0 seconds, (D) a molecular weight distribution (Mw/Mn) of 2.50 to 4.00, and (F) a proportion of cis-structure in microstructural analysis of not more than 98 mol %; another rubber (ii); and a rubber reinforcing material (iii), is excellent in processability and properties of tire.Type: GrantFiled: August 17, 2016Date of Patent: October 8, 2019Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki Oshimo, Toshifumi Haba, Takahiro Mabuchi
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Patent number: 10414906Abstract: The present invention aims to provide pneumatic tires that can achieve both abrasion resistance and low heat build-up properties. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition containing: a rubber component including an isoprene-based rubber and a high-cis polybutadiene rubber having a cis content of 90% by mass or more; one or more types of carbon black; and sulfur, at least one of the one or more types of carbon black being produced from a feedstock oil that has a BMCI value of 150 or less and an aliphatic hydrocarbon content of 30% by mass or more, the BMCI value being calculated from the average boiling point T (° C.) and the specific gravity D (60/60° F.) relative to water at 60° F. according to the equation below, BMCI=48,640/(T+273)+473.7D?456.8.Type: GrantFiled: September 30, 2015Date of Patent: September 17, 2019Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Ryota Kitago, Takayuki Nagase, Yuuki Kawana, Takayuki Hattori, Takao Wada, Soh Ishino, Yuhei Yamashiro, Masaki Oshimo, Masanobu Nakamura
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Patent number: 10385184Abstract: Provided is a rubber composition that achieves a balanced improvement in fuel economy, abrasion resistance, and wet grip performance while having good processability. Also provided is a pneumatic tire including a tread formed from the rubber composition. The present invention relates to a rubber composition containing: a rubber component including a copolymer; and carbon black and/or silica, the copolymer containing a structural unit derived from a conjugated diene monomer and a structural unit derived from a compound represented by the following formula (1): wherein R11 represents a C1-C30 hydrocarbon group.Type: GrantFiled: May 16, 2017Date of Patent: August 20, 2019Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Toshifumi Haba, Masaki Oshimo
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Publication number: 20190184745Abstract: Provided is a pneumatic tire that provides a balanced improvement of tensile strength and fuel economy. Included is a rubber composition for tires containing: a rubber component including an aromatic vinyl-conjugated diene copolymer that contains aromatic vinyl units derived from an aromatic vinyl compound and conjugated diene units derived from a conjugated diene compound; carbon black; and silica, the copolymer containing at least 80% of isolated aromatic vinyl units based on the total aromatic vinyl units, the copolymer having a ?Tg of more than 10° C. but less than 20° C. as determined by DSC, the rubber component including, based on 100% by mass thereof, 10% by mass or more of the copolymer, the rubber composition containing 10 parts by mass or more of the silica per 100 parts by mass of the rubber component.Type: ApplicationFiled: November 28, 2018Publication date: June 20, 2019Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, Daisuke SATO, Takahiro MABUCHI
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Publication number: 20190184746Abstract: Provided is a pneumatic tire that provides a balanced improvement of abrasion resistance, wet grip performance, and fuel economy. A rubber composition for tires containing: a rubber component including an aromatic vinyl-conjugated diene copolymer that contains aromatic vinyl units derived from an aromatic vinyl compound and conjugated diene units derived from a conjugated diene compound; carbon black; and a silica having a N2SA of 40 m2/g or more, the copolymer containing at least 80% of isolated aromatic vinyl units based on the total aromatic vinyl units, the copolymer having a ?Tg of more than 10° C. but less than 20° C. as determined by DSC, the rubber component including, based on 100% by mass thereof, 1-60% by mass of the copolymer and 0-99% by mass of an isoprene-based rubber, the rubber composition containing 10 parts by mass or more of the silica per 100 parts by mass of the rubber component.Type: ApplicationFiled: November 28, 2018Publication date: June 20, 2019Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, Daisuke SATO, Takahiro MABUCHI
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Publication number: 20190185645Abstract: Provided is a pneumatic tire that provides a balanced improvement of abrasion resistance, wet grip performance, and fuel economy. A rubber composition for tires containing: a rubber component including an aromatic vinyl-conjugated diene copolymer that contains aromatic vinyl units derived from an aromatic vinyl compound and conjugated diene units derived from a conjugated diene compound; carbon black; and a silica having a N2SA of 40 m2/g or more, the copolymer containing at least 80% of isolated aromatic vinyl units based on the total aromatic vinyl units, the copolymer having a ?Tg of more than 10° C. but less than 20° C. as determined by DSC, the rubber component including, based on 100% by mass thereof, 1-90% by mass of the copolymer and 0-70% by mass of an isoprene-based rubber, the rubber composition containing 10 parts by mass or more of the silica per 100 parts by mass of the rubber component.Type: ApplicationFiled: December 3, 2018Publication date: June 20, 2019Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, Daisuke SATO, Takahiro MABUCHI
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Patent number: 10245888Abstract: Provided is a rubber composition for tires achieving a balanced improvement of fuel economy, abrasion resistance, and road noise-reducing properties. The present invention relates to a rubber composition for tires, containing a core-shell structured particle including a core and a shell, the core having a melt viscosity at 38° C. of 0.1 to 3,000 Pa·s, the shell being formed of a polymer of a conjugated diene compound and/or an aromatic vinyl compound.Type: GrantFiled: January 29, 2018Date of Patent: April 2, 2019Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Masaki Oshimo
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Publication number: 20180258263Abstract: The present invention provides a rubber composition for tires that can provide for a balanced improvement of fuel economy and abrasion resistance, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a styrene-butadiene rubber having a styrene content of 30% by mass or more; and a polybutadiene rubber having a stress relaxation time (T80) of 10 or more.Type: ApplicationFiled: February 12, 2018Publication date: September 13, 2018Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Masaki OSHIMO
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Publication number: 20180258262Abstract: A pneumatic tire having a tire component prepared by use of a rubber composition according to the present invention which comprises: a polybitadiene (i) which satisfies conditions of (A) a Mooney viscosity (ML1+4, 100° C.) of 43 to 70, (B) a ratio (Tcp/ML1+4, 100° C.) of 5% by mass toluene solution viscosity (Tcp) to Mooney viscosity (ML1+4, 100° C.) of 0.9 to 1.7, (C) a stress relaxation time (T80), being a time until a torque is attenuated by 80% assuming that the torque at the end of ML1+4, 100° C. measurement is 100%, of 10.0 to 40.0 seconds, (D) a molecular weight distribution (Mw/Mn) of 2.50 to 4.00, and (F) a proportion of cis-structure in microstructural analysis of not more than 98 mol %; another rubber (ii); and a rubber reinforcing material (iii), is excellent in processability and properties of tire.Type: ApplicationFiled: August 17, 2016Publication date: September 13, 2018Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, Toshifumi HABA, Takahiro MABUCHI
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Publication number: 20180229551Abstract: Provided is a rubber composition for tires achieving a balanced improvement of fuel economy, abrasion resistance, and road noise-reducing properties. The present invention relates to a rubber composition for tires, containing a core-shell structured particle including a core and a shell, the core having a melt viscosity at 38° C. of 0.1 to 3,000 Pa·s, the shell being formed of a polymer of a conjugated diene compound and/or an aromatic vinyl compound.Type: ApplicationFiled: January 29, 2018Publication date: August 16, 2018Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Masaki OSHIMO
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Publication number: 20180186973Abstract: The present invention aims to provide pneumatic tires that can achieve both abrasion resistance and low heat build-up properties. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition containing: a rubber component including an isoprene-based rubber and a high-cis polybutadiene rubber having a cis content of 90% by mass or more; one or more types of carbon black; and sulfur, at least one of the one or more types of carbon black being produced from a feedstock oil that has a BMCI value of 150 or less and an aliphatic hydrocarbon content of 30% by mass or more, the BMCI value being calculated from the average boiling point T (° C.) and the specific gravity D (60/60° F.) relative to water at 60° F. according to the equation below, BMCI=48,640/(T+273)+473.7D?456.8.Type: ApplicationFiled: September 30, 2015Publication date: July 5, 2018Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Ryota KITAGO, Takayuki NAGASE, Yuuki KAWANA, Takayuki HATTORI, Takao WADA, Soh ISHINO, Yuhei YAMASHIRO, Masaki OSHIMO, Masanobu NAKAMURA
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Patent number: 9873775Abstract: Provided are a rubber composition that shows a balanced improvement in fuel economy and abrasion resistance while having good processability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition containing: a rubber component including a copolymer containing a structural unit derived from a conjugated diene monomer, a structural unit derived from farnesene, and a structural unit derived from a compound represented by the formula (1) below; and carbon black and/or silica, wherein R11 and R12 are the same as or different from each other and each represent a hydrogen atom or a C1-C30 hydrocarbon group.Type: GrantFiled: October 19, 2016Date of Patent: January 23, 2018Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki Oshimo, Kenya Watanabe, Toshifumi Haba
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Publication number: 20170355830Abstract: Provided is a rubber composition that achieves a balanced improvement in fuel economy, abrasion resistance, and wet grip performance while having good processability. Also provided is a pneumatic tire including a tread formed from the rubber composition. The present invention relates to a rubber composition containing: a rubber component including a copolymer; and carbon black and/or silica, the copolymer containing a structural unit derived from a conjugated diene monomer and a structural unit derived from a compound represented by the following formula (1): wherein R11 represents a C1-C30 hydrocarbon group.Type: ApplicationFiled: May 16, 2017Publication date: December 14, 2017Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Toshifumi HABA, Masaki OSHIMO
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Publication number: 20170137599Abstract: Provided are a rubber composition that shows a balanced improvement in fuel economy and abrasion resistance while having good processability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition containing: a rubber component including a copolymer containing a structural unit derived from a conjugated diene monomer, a structural unit derived from farnesene, and a structural unit derived from a compound represented by the formula (1) below; and carbon black and/or silica, wherein R11 and R12 are the same as or different from each other and each represent a hydrogen atom or a C1-C30 hydrocarbon group.Type: ApplicationFiled: October 19, 2016Publication date: May 18, 2017Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.Inventors: Masaki OSHIMO, Kenya WATANABE, Toshifumi HABA