Patents by Inventor Yoshiyuki Tsunematsu

Yoshiyuki Tsunematsu 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).

  • Oxytetramethylene glycol copolymer and method for producing the same
    Patent number: 7485696
    Abstract: Disclosed is an oxytetramethylene glycol copolymer, which is obtained by copolymerizing tetrahydrofuran and neopentyl glycol and which has a specific number average molecular weight Mn, a specific molecular weight distribution Mw/Mn, a specific neopentyl glycol copolymerization whole ratio Nw and a specific neopentyl glycol copolymerization partial ratio Nh, and a method for producing the same. Also disclosed is a method for purifying an oxytetramethylene glycol copolymer, which comprises adding a fresh tetrahydrofuran to a reaction mixture comprising an oxytetramethylene glycol copolymer and an unreacted diol, wherein the amount of added tetrahydrofuran is not less than the weight of the unreacted diol contained in the reaction mixture, and distilling off the unreacted diol together with the added tetrahydrofuran.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: February 3, 2009
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Tamotsu Kodama, Haruyuki Minoura, Yoshiyuki Tsunematsu, Toshihiko Fukuzono, Satoshi Furubeppu
  • Oxytetramethylene glycol copolymer and method for producing the same
    Publication number: 20070173631
    Abstract: Disclosed is an oxytetramethylene glycol copolymer, which is obtained by copolymerizing tetrahydrofuran and neopentyl glycol and which has a specific number average molecular weight. Mn, a specific molecular weight distribution Mn/Mw, a specific neopentyl glycol copolymerization whole ratio Nw and a specific neopentyl glycol copolymerization partial ratio Nh, and a method for producing the same. Also disclosed is a method for purifying an oxytetramethylene glycol copolymer, which comprises adding a fresh tetrahydrofuran to a reaction mixture comprising an oxytetramethylene glycol copolymer and an unreacted diol, wherein the amount of added tetrahydrofuran is not less than the weight of the unreacted diol contained in the reaction mixture, and distilling off the unreacted diol together with the added tetrahydrofuran.
    Type: Application
    Filed: April 2, 2007
    Publication date: July 26, 2007
    Inventors: Tamotsu Kodama, Haruyuki Minoura, Yoshiyuki Tsunematsu, Toshihiko Fukuzono, Satoshi Furubeppu
  • Oxytetramethylene glycol copolymer and process for producing the same
    Publication number: 20040049007
    Abstract: Disclosed is an oxytetramethylene glycol copolymer, which is obtained by copolymerizing tetrahydrofuran and neopentyl glycol and which has a specific number average molecular weight Mn, a specific molecular weight distribution Mn/Mw, a specific neopentyl glycol copolymerization whole ratio Nw and a specific neopentyl glycol copolymerization partial ratio Nh, and a method for producing the same. Also disclosed is a method for purifying an oxytetramethylene glycol copolymer, which comprises adding a fresh tetrahydrofuran to a reaction mixture comprising an oxytetramethylene glycol copolymer and an unreacted diol, wherein the amount of added tetrahydrofuran is not less than the weight of the unreacted diol contained in the reaction mixture, and distilling off the unreacted diol together with the added tetrahydrofuran.
    Type: Application
    Filed: July 9, 2003
    Publication date: March 11, 2004
    Inventors: Tamotsu Kodama, Haruyuki Minoura, Yoshiyuki Tsunematsu, Toshihiko Fukuzono, Satoshi Furubeppu