Patents by Inventor Hiromi Nakafutami

Hiromi Nakafutami 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: 20200199258
    Abstract: A modified conjugated diene-based polymer according to the present invention has a weight average molecular weight of 20×104 or more and 300×104 or less, has a molecular weight distribution Mw/Mn of 1.6 or more and 4.0 or less, has a modification ratio of 30% by mass or more and 80% by mass or less with respect to a total amount of the conjugated diene-based polymer, and includes 5% by mass or more and 50% by mass or less of a component having a molecular weight of 1,000,000 or more and 5,000,000 or less in GPC (gel permeation chromatography), wherein a modification ratio of the component having a molecular weight of 1,000,000 or more and 5,000,000 or less is 90% by mass or more and 100% by mass or less.
    Type: Application
    Filed: April 26, 2018
    Publication date: June 25, 2020
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Koichi Hasebe, Ryo Suzuki, Hiromi Nakafutami
  • Publication number: 20200031975
    Abstract: A modified conjugated diene-based polymer having a weight average molecular weight of 20×104 or more and 300×104 or less, and having a molecular weight distribution Mw/Mn of 1.6 or more and 4.0 or less, wherein a modification ratio with respect to a total amount of the conjugated diene-based polymer is 50% by mass or more, a modification ratio of a component having a molecular weight which is ½ of a molecular weight at a peak top, or a peak top of the minimum molecular weight when a plurality of the peak tops of molecular weights is present, in a gel permeation chromatography curve is ½ or more of the modification ratio with respect to the total amount of the conjugated diene-based polymer, and a content of nitrogen contained in the modified conjugated diene-based polymer is 3 mass ppm or more and 70 mass ppm or less.
    Type: Application
    Filed: March 5, 2018
    Publication date: January 30, 2020
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Koichi Hasebe, Ryo Suzuki, Hiromi Nakafutami
  • 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
  • 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: 6969739
    Abstract: A diene polymer rubber composition comprising (A) 100 parts by weight of a raw material rubber comprising (A-1) a diene rubbery polymer which is a conjugated diene rubber polymer or conjugated diene-styrene rubbery copolymer (1) containing a modified component in an amount exceeding 60 wt. %, which modified component is obtained by reacting an active end of the rubbery polymer with a polyfunctional compound having, in its molecule, at least two epoxy groups, (2) having a molecular weight distribution Mw/Mn of 1.05 to 3.0, and (3) having weight-average molecular weight of 100,000 to 2,000,000; and based on 100 parts of the component (A), (B) 1–100 parts by weight of rubber extension oil, (C) 25–100 parts by weight of reinforcing silica, and (D) 1.0 to 20 parts by weight in total of a vulcanizing agent and a vulcanizing accelerator.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: November 29, 2005
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Akira Saito, Haruo Yamada, Nobuaki Kubo, Hiromi Nakafutami, legal representative, Yasunobu Nakafutami, deceased
  • Patent number: 6906152
    Abstract: The present invention provides a diene rubber composition having excellent processability and being improved in both the balance between low rolling resistance and wet skid resistance, and strength properties. The composition according to the invention is a diene polymer rubber composition comprising (A) 100 parts by weight of a raw material rubber comprising (A-1) a diene rubbery polymer which is a conjugated diene rubbery polymer or a conjugated diene-styrene rubbery copolymer (1) containing a modified component in an amount exceeding 60 wt. %, which modified component is obtained by reacting an active end of the rubbery polymer with a polyfunctional compound having, in its molecule thereof, at least two epoxy groups, (2) having a molecular weight distribution Mw/Mn of 1.05 to 3.
    Type: Grant
    Filed: March 10, 2003
    Date of Patent: June 14, 2005
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Akira Saito, Haruo Yamada, Hiromi Nakafutami, Yasunobu Nakafutami
  • Publication number: 20030199669
    Abstract: The present invention provides a diene rubber composition having excellent processability and being improved in both the balance between low rolling resistance and wet skid resistance, and strength properties. The composition according to the invention is a diene polymer rubber composition comprising (A) 100 parts by weight of a raw material rubber comprising (A-1) a diene rubbery polymer which is a conjugated diene rubbery polymer or a conjugated diene-styrene rubbery copolymer (1) containing a modified component in an amount exceeding 60 wt. %, which modified component is obtained by reacting an active end of the rubbery polymer with a polyfunctional compound having, in its molecule thereof, at least two epoxy groups, (2) having a molecular weight distribution Mw/Mn of 1.05 to 3.
    Type: Application
    Filed: March 10, 2003
    Publication date: October 23, 2003
    Applicant: Asahi Kasei Kabushiki Kaisha
    Inventors: Akira Saito, Haruo Yamada, Yasunobu Nakafutami, Hiromi Nakafutami
  • 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