Patents by Inventor Shigenaga TAKANO

Shigenaga TAKANO 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: 20210061936
    Abstract: It is an object of the disclosure to provide a production method for a copolymer in which a copolymer with a high content of cis-1,4 bonds of a conjugated diene portion can be obtained at a high yield even when a cyclic olefin compound is used as a monomer.
    Type: Application
    Filed: August 28, 2018
    Publication date: March 4, 2021
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shigenaga TAKANO, Shojiro KAITA, Olivier TARDIF
  • Publication number: 20210002399
    Abstract: An object of the present disclosure is to provide a copolymer which is reduced in heat generation in a low strain region and exhibits good workability, while having excellent wear resistance and crack growth resistance. To achieve the object, the present disclosure proposes a copolymer containing at least a non-conjugated olefin unit and a conjugated diene unit, wherein: a content of the non-conjugated olefin unit therein is equal to or larger than 40 mol %; and a degree of crystallinity derived from the non-conjugated olefin unit in the temperature range of 100° C. to 150° C. measured by a differential scanning calorimeter (DSC), is equal to or smaller than 4.0%. The present disclosure also proposes a method for manufacturing the copolymer.
    Type: Application
    Filed: November 29, 2018
    Publication date: January 7, 2021
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shigenaga TAKANO, Olivier TARDIF
  • Patent number: 10875952
    Abstract: An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product having high abrasion resistance and wet performance. Further, the invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition produced by crosslinking the rubber composition, and a tire and a rubber product using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the content of the aromatic vinyl unit is 5 mol % or more and less than 50 mol % of the whole multicomponent copolymer and the content of the non-conjugated olefin unit is more than 0 mol % and 50 mol % or less of the whole multicomponent copolymer.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: December 29, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Kyohei Kotani, Shigenaga Takano, Shigeki Oishi, Shojiro Kaita
  • Patent number: 10875937
    Abstract: An object of the present disclosure is to provide a terminal-modified conjugated dime polymer capable of improving fracture resistance of a rubber article. Specifically, a terminal-modified conjugated diene polymer is characterized in that a content of catalyst residue therein derived from a catalyst used in polymerization is less than 60 ppm.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: December 29, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Yusuke Yamagata, Shojiro Kaita, Shigenaga Takano
  • Publication number: 20200347169
    Abstract: To provide a catalyst composition having high polymerization activity. To provide a polymer manufacturing method. To provide a polymer manufactured by the polymer manufacturing method. To provide a rubber composition including the polymer. To provide a tire using the rubber composition. A catalyst composition including a compound represented by Structural Formula I below, wherein the compound has an OH group at at least one position of the bipyridyl ring; M is a transition metal, a lanthanoid, scandium, or yttrium; R1 and R2 are a hydrocarbon group having one or more carbon atoms or a halogen atom; and R1 and R2 may be the same or different from each other. A polymer manufacturing method including a step of polymerizing one or more selected from the group consisting of a conjugated diene compound and a compound having an ethylenically unsaturated double bond in the presence of the catalyst composition. A polymer manufactured by the manufacturing method. A rubber composition including the polymer.
    Type: Application
    Filed: August 28, 2018
    Publication date: November 5, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shigenaga TAKANO, Shojiro KAITA, Kohtaro OSAKADA, Duisuke TAKEUCHI, Shinji YAMAKAWA
  • Publication number: 20200299429
    Abstract: An object of the present disclosure is to provide a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit and capable of improving an elastic modulus of a rubber composition. Specifically, the present disclosure provides a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit, wherein the difference (Tem?Tim) between an extrapolated melting end temperature (Tem) as measured in accordance with JIS K7121 and an extrapolated melting initiation temperature (Tim) as measured in accordance with JIS K7121 is not higher than 60° C.
    Type: Application
    Filed: September 27, 2018
    Publication date: September 24, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Shigenaga TAKANO
  • Publication number: 20200140576
    Abstract: To provide a method for producing a multicomponent copolymer with which a multicomponent copolymer having excellent rupture strength can be obtained, and a multicomponent copolymer, a rubber composition and a tire having excellent rupture strength. The method is a method for producing a multicomponent copolymer having a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, comprising adding continuously or intermittently continuously a conjugated diene compound into a reactor containing a catalyst and at least one selected from the group consisting of a non-conjugated olefin compound and an aromatic vinyl compound. The multicomponent copolymer is obtained with the production method. The rubber composition comprises the multicomponent copolymer as a rubber component. The tire uses the rubber composition.
    Type: Application
    Filed: April 16, 2018
    Publication date: May 7, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shigenaga TAKANO, Aya YANAGISAWA, Olivier TARDIF, Yasuo HORIKAWA
  • Publication number: 20200048380
    Abstract: To provide a method for producing a multicomponent copolymer with which a multicomponent copolymer having excellent rupture strength can be obtained, and a multicomponent copolymer, a rubber composition and a tire having excellent rupture strength. The method is a method for producing a multicomponent copolymer having a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, comprising adding a conjugated diene compound in divided portions into a reactor containing a catalyst and at least one selected from the group consisting of a non-conjugated olefin compound and an aromatic vinyl compound. The multicomponent copolymer is obtained with the production method. The rubber composition comprises the multicomponent copolymer as a rubber component. The tire uses the rubber composition.
    Type: Application
    Filed: October 17, 2019
    Publication date: February 13, 2020
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shigenaga TAKANO, Aya Yanagisawa, Olivier Tardif, Yasuo Horikawa
  • Publication number: 20190161571
    Abstract: An object of the present disclosure is to provide a terminal-modified conjugated diene polymer having a high cis-1,4 content and a low molecular weight distribution value and being excellent in durability (such as wear resistance, fracture resistance, cracking resistance, and the like). In order to achieve the object, a terminal-modified conjugated diene polymer of the present disclosure characteristically has: molecular weight distribution determined by gel permeation chromatography (GPC) of less than 2; and content of cis-1,4 bond of 95% or more.
    Type: Application
    Filed: March 29, 2017
    Publication date: May 30, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yusuke YAMAGATA, Shojiro KAITA, Shigenaga TAKANO
  • Publication number: 20190153123
    Abstract: An object of the present disclosure is to provide a terminal-modified conjugated diene polymer capable of improving fracture resistance of a rubber article. Specifically, a terminal-modified conjugated diene polymer is characterized in that a content of catalyst residue therein derived from a catalyst used in polymerization is less than 60 ppm.
    Type: Application
    Filed: April 27, 2017
    Publication date: May 23, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yusuke YAMAGATA, Shojiro KAITA, Shigenaga TAKANO
  • Publication number: 20180298136
    Abstract: An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product having high abrasion resistance and wet performance. Further, the invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition produced by crosslinking the rubber composition, and a tire and a rubber product using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the content of the aromatic vinyl unit is 5 mol % or more and less than 50 mol % of the whole multicomponent copolymer and the content of the non-conjugated olefin unit is more than 0 mol % and 50 mol % or less of the whole multicomponent copolymer.
    Type: Application
    Filed: October 14, 2016
    Publication date: October 18, 2018
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Kyohei KOTANI, Shigenaga TAKANO, Shigeki OISHI, Shojiro KAITA