Patents by Inventor Shinichi Sekikawa

Shinichi Sekikawa 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: 20210301046
    Abstract: A modified conjugated diene-based polymer, including a coupling polymer, wherein a ratio of the coupling polymer, obtained by gel permeation chromatography (GPC), is 30% by mass or more and less than 70% by mass in the entire modified conjugated diene-based polymer, and a modification ratio obtained by adsorption GPC is 30% by mass or more and less than 70% by mass in the entire modified conjugated diene-based polymer, when a peak top molecular weight, obtained by the GPC, of the coupling polymer of the modified conjugated diene-based polymer is represented by Mp1 and a peak top molecular weight of a non-coupling polymer is represented by Mp2, (Mp1/Mp2)?3.4, and a shrinking factor (g?) is less than 0.60.
    Type: Application
    Filed: August 7, 2017
    Publication date: September 30, 2021
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Shinichi Sekikawa, Miki Kyo
  • Publication number: 20210284827
    Abstract: Problem to be Solved The present invention provides a conjugated diene-based polymer composition excellent in rolling resistance, grip performance on a wet road surface, and abrasion resistance when formed into a tire. Solution A conjugated diene-based polymer composition containing: 10 to 90 parts by mass of a conjugated diene-based polymer (A) having a glass transition temperature of ?20° C. or more; and 10 to 90 parts by mass of a conjugated diene-based polymer (B) having a glass transition temperature of ?25° C. or less, wherein the conjugated diene-based polymer (A) has an absolute molecular weight, measured by viscosity detector-equipped GPC-light scattering measurement, of 40×104 or more and 5000×104 or less, and a branch number (Bn), measured by the viscosity detector-equipped GPC-light scattering measurement, of 8 or more.
    Type: Application
    Filed: March 9, 2021
    Publication date: September 16, 2021
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Shogo Sumitani, Shinichi Sekikawa, Kenta Hisamura, Yoshifumi Araki
  • Publication number: 20210189039
    Abstract: A production method for a branched conjugated diene-based polymer, comprising: a polymerizing step of obtaining a conjugated diene-based polymer having an active end by polymerizing or copolymerizing a conjugated diene compound, or a conjugated diene compound and an aromatic vinyl compound with an alkali metal compound or an alkaline earth metal compound used as a polymerization initiator; and a branching step of introducing a branch structure by reacting a styrene derivative as a branching agent with the active end of the conjugated diene-based polymer.
    Type: Application
    Filed: December 9, 2020
    Publication date: June 24, 2021
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Shinichi Sekikawa, Kenta Hisamura, Syogo Sumitani, Yoshifumi Araki
  • Patent number: 10519254
    Abstract: The present invention provides a modified conjugated diene-based polymer having a weight-average molecular weight of 20×104 or more and 300×104 or less, in which the modified conjugated diene-based polymer having a molecular weight of 200×104 or more and 500×104 or less is comprised in an amount of 0.25% by mass or more and 30% by mass or less based on a total amount of the modified conjugated diene-based polymer, and a shrinking factor (g?) is less than 0.64.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: December 31, 2019
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Miki Kyo, Shinichi Sekikawa, Hiromi Nakafutami
  • Patent number: 10434821
    Abstract: In a modified conjugated diene-based polymer, a ratio of a coupling polymer, obtained by gel permeation chromatography (GPC), is 70% by mass or more based on a total amount of the modified conjugated diene-based polymer, and a modification ratio obtained by adsorption GPC is 70% by mass or more based on a total amount of the modified conjugated diene-based polymer, and when Mooney viscosity ML1+4 (100° C.) measured at 100° C. is represented by ML and a weight average molecular weight obtained by GPC is represented by Mw, ML?1.8 (Mw×10?4)?31.5, and Mooney viscosity ML1+4 (100° C.) measured at 100° C. is 30 to 150.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: October 8, 2019
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Miki Kyo, Shinichi Sekikawa
  • Publication number: 20190184747
    Abstract: A modified conjugated diene-based polymer containing: having a weight average molecular weight of 20×104 or more and 300×104 or less, having a star-branched structure with a conjugated diene-based polymer chain bonded to a modifier residue, wherein the modifier residue has at least 4 silicon atoms, and alkoxy groups and/or hydroxyl groups and the conjugated diene-based polymer chain is bonded to the silicon atom, wherein the number of alkoxy groups and/or hydroxyl groups in the modifier residue is larger than the number of the silicon atoms on average.
    Type: Application
    Filed: August 7, 2017
    Publication date: June 20, 2019
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Miki Kyo, Shinichi Sekikawa
  • Publication number: 20180162167
    Abstract: In a modified conjugated diene-based polymer, a ratio of a coupling polymer, obtained by gel permeation chromatography (GPC), is 70% by mass or more based on a total amount of the modified conjugated diene-based polymer, and a modification ratio obtained by adsorption GPC is 70% by mass or more based on a total amount of the modified conjugated diene-based polymer, and when Mooney viscosity ML1+4 (100° C.) measured at 100° C. is represented by ML and a weight average molecular weight obtained by GPC is represented by Mw, ML 1.8 (Mw×10?4)?31.5, and Mooney viscosity ML1+4 (100° C.) measured at 100° C. is 30 to 150.
    Type: Application
    Filed: June 7, 2016
    Publication date: June 14, 2018
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Miki Kyo, Shinichi Sekikawa
  • Publication number: 20180066076
    Abstract: The present invention provides a modified conjugated diene-based polymer having a weight-average molecular weight of 20×104 or more and 300×104 or less, in which the modified conjugated diene-based polymer having a molecular weight of 200×104 or more and 500×104 or less is comprised in an amount of 0.25% by mass or more and 30% by mass or less based on a total amount of the modified conjugated diene-based polymer, and a shrinking factor (g?) is less than 0.64.
    Type: Application
    Filed: February 18, 2016
    Publication date: March 8, 2018
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Miki Kyo, Shinichi Sekikawa, Hiromi Nakafutami
  • Patent number: 9644046
    Abstract: A method for producing a modified conjugated diene-based polymer having a good balance between the hysteresis loss properties and the wet skid resistance, practically sufficient abrasion resistance and breaking strength, and high processability when formed into a vulcanized product is provided. A method for producing a modified conjugated diene-based polymer, comprising: a polymerization step of polymerizing a conjugated diene compound, copolymerizing conjugated diene compounds, or copolymerizing a conjugated diene compound with an aromatic vinyl compound using an alkali metal compound or an alkaline earth metal compound as a polymerization initiator to obtain a conjugated diene-based polymer having an active end, and a modifying step of reacting a compound represented by following formula (1) with the active end of the conjugated diene-based copolymer.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: May 9, 2017
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Shinichi Sekikawa, Junichi Yoshida, Takaaki Matsuda
  • Publication number: 20160096909
    Abstract: A method for producing a modified conjugated diene-based polymer having a good balance between the hysteresis loss properties and the wet skid resistance, practically sufficient abrasion resistance and breaking strength, and high processability when formed into a vulcanized product is provided. A method for producing a modified conjugated diene-based polymer, comprising: a polymerization step of polymerizing a conjugated diene compound, copolymerizing conjugated diene compounds, or copolymerizing a conjugated diene compound with an aromatic vinyl compound using an alkali metal compound or an alkaline earth metal compound as a polymerization initiator to obtain a conjugated diene-based polymer having an active end, and a modifying step of reacting a compound represented by following formula (1) with the active end of the conjugated diene-based copolymer.
    Type: Application
    Filed: October 22, 2015
    Publication date: April 7, 2016
    Applicant: Asahi Kasei Chemicals Corporation
    Inventors: Shinichi Sekikawa, Junichi Yoshida, Takaaki Matsuda
  • Patent number: 9193807
    Abstract: A method for producing a modified conjugated diene-based polymer having a good balance between the hysteresis loss properties and the wet skid resistance, practically sufficient abrasion resistance and breaking strength, and high processability when formed into a vulcanized product is provided. A method for producing a modified conjugated diene-based polymer, comprising: a polymerization step of polymerizing a conjugated diene compound, copolymerizing conjugated diene compounds, or copolymerizing a conjugated diene compound with an aromatic vinyl compound using an alkali metal compound or an alkaline earth metal compound as a polymerization initiator to obtain a conjugated diene-based polymer having an active end, and a modifying step of reacting a compound represented by following formula (1) with the active end of the conjugated diene-based copolymer.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: November 24, 2015
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Shinichi Sekikawa, Junichi Yoshida, Takaaki Matsuda
  • Patent number: 8946339
    Abstract: There is provided a modified conjugated diene-based polymer having a silyl group substituted with one or more alkoxy groups, and one or more nitrogen atoms on the chain ends of a conjugated diene-based polymer, the modified conjugated diene-based polymer being obtained by polymerizing a conjugated diene compound, or copolymerizing a conjugated diene compound with an aromatic vinyl compound, by using a polyfunctional anionic polymerization initiator prepared from a polyvinyl aromatic compound and an organolithium compound in a range of a molar ratio (the polyvinyl aromatic compound/the organolithium compound) of from 0.05 to 1.0, so as to obtain the conjugated diene-based polymer, and by reacting a living polymer end of the conjugated diene polymer with the compound having a silyl group substituted with two or more alkoxy groups, and one or more nitrogen atoms.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: February 3, 2015
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Junichi Yoshida, Shinichi Sekikawa, Ryoko Fukuoka
  • Patent number: 8816014
    Abstract: There are provided a modified conjugated diene-based polymer having a good balance between the hysteresis loss properties and the wet skid resistance, practically sufficient abrasion resistance and fracture strength, and high processability when formed into a vulcanized product, and a modified conjugated diene-based polymer composition. A method for producing a modified conjugated diene-based polymer, comprising: a polymerization step of polymerizing a conjugated diene compound or copolymerizing a conjugated diene compound with an aromatic vinyl compound using an alkali metal compound or an alkaline earth metal compound as a polymerization initiator to obtain a conjugated diene-based polymer having a reactive end, and a modifying step of reacting a compound having a specific structure with the reactive end of the conjugated diene-based polymer.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: August 26, 2014
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Junichi Yoshida, Shinichi Sekikawa, Takaaki Matsuda
  • Publication number: 20130023624
    Abstract: A method for producing a modified conjugated diene-based polymer having a good balance between the hysteresis loss properties and the wet skid resistance, practically sufficient abrasion resistance and breaking strength, and high processability when formed into a vulcanized product is provided. A method for producing a modified conjugated diene-based polymer, comprising: a polymerization step of polymerizing a conjugated diene compound, copolymerizing conjugated diene compounds, or copolymerizing a conjugated diene compound with an aromatic vinyl compound using an alkali metal compound or an alkaline earth metal compound as a polymerization initiator to obtain a conjugated diene-based polymer having an active end, and a modifying step of reacting a compound represented by following formula (1) with the active end of the conjugated diene-based copolymer.
    Type: Application
    Filed: April 15, 2011
    Publication date: January 24, 2013
    Applicant: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Shinichi Sekikawa, Junichi Yoshida, Takaaki Matsuda
  • Publication number: 20120277369
    Abstract: There are provided a modified conjugated diene-based polymer having a good balance between the hysteresis loss properties and the wet skid resistance, practically sufficient abrasion resistance and fracture strength, and high processability when formed into a vulcanized product, and a modified conjugated diene-based polymer composition. A method for producing a modified conjugated diene-based polymer, comprising: a polymerization step of polymerizing a conjugated diene compound or copolymerizing a conjugated diene compound with an aromatic vinyl compound using an alkali metal compound or an alkaline earth metal compound as a polymerization initiator to obtain a conjugated diene-based polymer having a reactive end, and a modifying step of reacting a compound having a specific structure with the reactive end of the conjugated diene-based polymer.
    Type: Application
    Filed: September 22, 2010
    Publication date: November 1, 2012
    Inventors: Junichi Yoshida, Shinichi Sekikawa, Takaaki Matsuda
  • Publication number: 20110172344
    Abstract: There is provided a modified conjugated diene-based polymer having a silyl group substituted with one or more alkoxy groups, and one or more nitrogen atoms on the chain ends of a conjugated diene-based polymer, the modified conjugated diene-based polymer being obtained by polymerizing a conjugated diene compound, or copolymerizing a conjugated diene compound with an aromatic vinyl compound, by using a polyfunctional anionic polymerization initiator prepared from a polyvinyl aromatic compound and an organolithium compound in a range of a molar ratio (the polyvinyl aromatic compound/the organolithium compound) of from 0.05 to 1.0, so as to obtain the conjugated diene-based polymer, and by reacting a living polymer end of the conjugated diene polymer with the compound having a silyl group substituted with two or more alkoxy groups, and one or more nitrogen atoms.
    Type: Application
    Filed: October 13, 2009
    Publication date: July 14, 2011
    Applicant: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Junichi Yoshida, Shinichi Sekikawa, Ryoko Fukuoka
  • Patent number: 6455635
    Abstract: A hydrogenated block copolymer which comprises at least two polymer blocks A each mainly comprising an aromatic vinyl hydrocarbon compound monomer unit and at least two hydrogenated polymer blocks B each mainly comprising a butadiene monomer unit, at least 90% of the olefinically unsaturated double bonds in said polymer block mainly comprising a butadiene monomer unit before hydrogenation having been hydrogenated, wherein at least one of the block at the terminal of the hydrogenated block copolymer is the polymer block B, wherein the proportion of the terminal polymer blocks B in the hydrogenated block copolymer is at least 0.1 wt % but less than 9.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: September 24, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Jun Yonezawa, Shinichi Sekikawa, Hiromi Nakafutami, Takashi Sato