Patents by Inventor Kensuke WASHIZU

Kensuke WASHIZU 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).

  • Publication number: 20250018747
    Abstract: Provided is a tire comprising a tread at least having two layers each comprising a rubber component and a plasticizer, wherein a difference (AE1?AE2) between an acetone extraction amount AE1 of the rubber composition of the first layer and an acetone extraction amount AE2 of the rubber composition of the second layer is greater than 6.0% by mass, and wherein, with the first layer and the second layer being attached together, when they are applied with a dynamic stimulus under a condition of a dynamic stress of 0.45 MPa, a frequency of 50 Hz, and a temperature at 80° C. for 120 hours, a rate of change in acetone extraction amount of the rubber composition of the first layer before and after being applied with the predetermined dynamic stimulus is ?10% or more and 10% or less.
    Type: Application
    Filed: November 24, 2022
    Publication date: January 16, 2025
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kensuke WASHIZU, Kazuo HOCHI
  • Patent number: 12157818
    Abstract: The present invention aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present invention relates to a rubber composition having a dynamic modulus E* that reversibly changes with water and satisfying the following relationship (1): Dynamic modulus E*when water-wet/Dynamic modulus E*when dry×100%?90%??(1).
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: December 3, 2024
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke Washizu
  • Patent number: 12152128
    Abstract: The present invention provides rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. Included is a rubber composition having a hardness that reversibly changes with water, satisfying the relationships (1) and (2) below, and having a stress at break of 8.0 MPa or more, Hardness when dry?Hardness when water-wet?1??(1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition, 0.90?Volume when water-wet/Volume when dry?1.01??(2) wherein each volume represents the volume at 25° C. of the rubber composition.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: November 26, 2024
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Shoko Nakahata, Kensuke Washizu, Takahiro Mabuchi
  • Patent number: 12139612
    Abstract: The present disclosure aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present disclosure relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationships (1) and (2): Hardness when dry?Hardness when water-wet?1 (1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition; and tan ? at 70° C. when dry?0.18 (2) wherein the tan ? at 70° C. represents the loss tangent measured at 70° C., an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz.
    Type: Grant
    Filed: May 15, 2020
    Date of Patent: November 12, 2024
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke Washizu
  • Patent number: 12060490
    Abstract: The present invention aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance, dry grip performance, and fuel economy. The present invention relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationships (1) and (2): Hardness when dry?Hardness when water-wet?1??(1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition; and tan ? at 70° C. when dry<0.14??(2) wherein the tan ? at 70° C. represents the loss tangent measured at 70° C., an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: August 13, 2024
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke Washizu
  • Patent number: 11987703
    Abstract: The present invention aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present invention relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationship (1): Hardness when dry?Hardness when water-wet?10??(1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: May 21, 2024
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke Washizu
  • Publication number: 20230399496
    Abstract: A plasticizer for resins and/or elastomers, the plasticizer containing a group that changes its interaction with respect to an antifreeze with changes in temperature, the group having a lower critical solution temperature of ?20° C. to 20° C.
    Type: Application
    Filed: November 1, 2021
    Publication date: December 14, 2023
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kensuke WASHIZU
  • Publication number: 20230220191
    Abstract: Provided are a polymer composite, a rubber composition, and a tire which can reversibly vary tire performance in response to changes in temperature. The present disclosure relates to a polymer composite formed from at least one conjugated diene polymer having a weight average molecular weight of 100,000 or more as determined by gel permeation chromatography, the polymer composite reversibly satisfying the following relationship (II) with respect to the temperature dependence of contact angles of water at two temperatures differing by at least 10° C.: (II) Temperature dependence of contact angles: (Contact angle at lower temperature)/(Contact angle at higher temperature)×100?90.
    Type: Application
    Filed: April 7, 2021
    Publication date: July 13, 2023
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke WASHIZU
  • Patent number: 11549007
    Abstract: Provided are copolymers which provide improved overall performance in terms of fuel economy and wet grip performance, as well as rubber compositions and tires containing the copolymers. Included is a copolymer obtained by copolymerizing an aromatic vinyl compound, a conjugated diene compound, and a compound represented by the formula (1) below or by copolymerizing a conjugated diene compound and a compound represented by the formula (1) below, the copolymer having a weight average molecular weight of 1.0×103 to 2.5×106, wherein R1 and R2 may be the same or different and each represents a functional group containing at least two selected from the group consisting of carbon, hydrogen, and silicon, and R1 and R2 may be joined together to form a ring structure.
    Type: Grant
    Filed: December 29, 2020
    Date of Patent: January 10, 2023
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kensuke Washizu
  • Publication number: 20220403069
    Abstract: The present disclosure provides a rubber composition and a tire which provide improved overall performance in terms of wet performance and dry performance. The present disclosure relates to a rubber composition, containing at least one polybutadiene rubber and/or at least one styrene-butadiene rubber, having a complex modulus E* that reversibly changes with water, and satisfying the following relationships 1) to 3): 1) Complex modulus E* when water-wet/Complex modulus E* before water-wet×100?98 wherein E* represents the E* at 23° C. of the rubber composition; 2) 99?Complex modulus E* after water-wet and dehydrated/Complex modulus E* before water-wet×100?100 wherein E* represents the E* at 23° C. of the rubber composition; 3) 99?Volume when water-wet/Volume before water-wet×100?100 wherein Volume represents the volume at 23° C. of the rubber composition.
    Type: Application
    Filed: September 23, 2020
    Publication date: December 22, 2022
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Yamato ICHIMOTO, Kensuke WASHIZU
  • Publication number: 20220306777
    Abstract: The present invention provides plasticizers, compositions, and tires which can vary tire performance in response to temperature changes. The present invention relates to a plasticizer for resins and/or elastomers, containing a group that changes hydrophilicity with changes in temperature.
    Type: Application
    Filed: April 27, 2020
    Publication date: September 29, 2022
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Shoko NAKAHATA, Kensuke WASHIZU, Shuichiro ONO
  • Publication number: 20220235209
    Abstract: The present disclosure aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present disclosure relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationships (1) and (2): Hardness when dry?Hardness when water-wet?1 (1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition; and tan ? at 70° C. when dry?0.18 (2) wherein the tan ? at 70° C. represents the loss tangent measured at 70° C., an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz.
    Type: Application
    Filed: May 15, 2020
    Publication date: July 28, 2022
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke WASHIZU
  • Publication number: 20210309837
    Abstract: The present invention aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present invention relates to a rubber composition having a dynamic modulus E* that reversibly changes with water and satisfying the following relationship (1): Dynamic modulus E* when water-wet/Dynamic modulus E* when dry×100%?90%??(1).
    Type: Application
    Filed: July 23, 2019
    Publication date: October 7, 2021
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke WASHIZU
  • Publication number: 20210301109
    Abstract: The present invention aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. The present invention relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationship (1): Hardness when dry?Hardness when water-wet?10 ??(1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition.
    Type: Application
    Filed: July 23, 2019
    Publication date: September 30, 2021
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke WASHIZU
  • Publication number: 20210292521
    Abstract: The present invention aims to provide rubber compositions and tires which provide improved overall performance in terms of wet grip performance, dry grip performance, and fuel economy. The present invention relates to a rubber composition having a hardness that reversibly changes with water and satisfying the following relationships (1) and (2): Hardness when dry?Hardness when water-wet?1??(1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition; and tan ? at 70° C. when dry<0.14??(2) wherein the tan ? at 70° C. represents the loss tangent measured at 70° C., an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz.
    Type: Application
    Filed: July 23, 2019
    Publication date: September 23, 2021
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventor: Kensuke WASHIZU
  • Publication number: 20210230396
    Abstract: The present invention provides rubber compositions and tires which provide improved overall performance in terms of wet grip performance and dry grip performance. Included is a rubber composition having a hardness that reversibly changes with water, satisfying the relationships (1) and (2) below, and having a stress at break of 8.0 MPa or more, Hardness when dry?Hardness when water-wet?1 ??(1) wherein each hardness represents the JIS-A hardness at 25° C. of the rubber composition, 0.90?Volume when water-wet/Volume when dry?1.01 ??(2) wherein each volume represents the volume at 25° C. of the rubber composition.
    Type: Application
    Filed: July 23, 2019
    Publication date: July 29, 2021
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Shoko NAKAHATA, Kensuke WASHIZU, Takahiro MABUCHI
  • Publication number: 20210230416
    Abstract: Provided are copolymers which provide improved overall performance in terms of fuel economy and wet grip performance, as well as rubber compositions and tires containing the copolymers. Included is a copolymer obtained by copolymerizing an aromatic vinyl compound, a conjugated diene compound, and a compound represented by the formula (1) below or by copolymerizing a conjugated diene compound and a compound represented by the formula (1) below, the copolymer having a weight average molecular weight of 1.0×103 to 2.5×106, wherein R1 and R2 may be the same or different and each represents a functional group containing at least two selected from the group consisting of carbon, hydrogen, and silicon, and R1 and R2 may be joined together to form a ring structure.
    Type: Application
    Filed: December 29, 2020
    Publication date: July 29, 2021
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kensuke WASHIZU
  • Patent number: 10759885
    Abstract: A pneumatic tire produced by processing a rubber composition including a hydrogenated branched conjugated diene copolymer produced by copolymerizing a branched conjugated diene compound and a vinyl compound to form a branched conjugated diene copolymer and hydrogenating the branched conjugated diene copolymer. The branched conjugated diene compound is represented by formula (1), where R1 is an aliphatic hydrocarbon having 6 to 11 carbon atoms, the vinyl compound is represented by formula (3), where R4 is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms, an alicyclic hydrocarbon group having 3 to 8 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: September 1, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kensuke Washizu
  • Patent number: 10494513
    Abstract: The present invention provides a rubber composition excellent in grip performance, durability of grip performance, and abrasion resistance. Also provided is a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition exhibiting a temperature dependence curve of tan ? with a half-width defined by Equation (1) of 45 or less as measured at a strain of 0.1% and a frequency of 10 Hz, the rubber composition having a temperature dependence of hardness defined by Equation (2) of 4.3 or less, the temperature dependence curve having a peak temperature of 10° C. or lower, half-width=(temperature at half-peak height on high temperature side)?(temperature at half-peak height on low temperature side),??Equation (1): temperature dependence of hardness=(hardness index at 0° C.)/(hardness index at 100° C.).
    Type: Grant
    Filed: April 4, 2018
    Date of Patent: December 3, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kensuke Washizu
  • Patent number: 10259895
    Abstract: There is provided a process for preparing a branched conjugated diene polymer by copolymerizing 1 to 100% by weight of a branched conjugated diene compound (1) monomer: wherein R1 is an aliphatic hydrocarbon having 6 to 11 carbon atoms, with 99 to 0% by weight of a conjugated diene compound (2) monomer: wherein R2 and R3 are the same or different and each is a hydrogen atom, or the like, and/or 99 to 0% by weight of a vinyl compound (3) monomer: wherein R4 is an aliphatic hydrocarbon group having 6 to 10 carbon atoms, or the like, wherein the process comprises a step of polymerizing by adding a monomer solution successively into a catalyst solution. The branched conjugated diene polymer is useful as a rubber component for a tire for improving processability.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: April 16, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kensuke Washizu