Patents by Inventor Saegusa Takeo

Saegusa Takeo 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).

  • Star block polyol lactam copolymer and process for the production thereof
    Patent number: 4751282
    Abstract: A novel star block copolymer represented by the general formula as shown below and a process for the production thereof are described. The copolymer has superior physical properties, particularly impact strength and, furthermore, is reduced in coloration. Thus the copolymer can find numerous uses; for example, it can be used in preparation of fibers, foams, automotive parts, and electrical components. The copolymer is produced by copolymerizing a star-shaped polyether prepolymer and a lactam, said prepolymer being prepared by reacting a star-shaped polyoxyalkylene having at least 3 terminal hydroxy groups and an N-chlorocarbonyl lactam, in the presence of an anionic polymerization catalyst. ##STR1## In this formula, all the symbols are as defined hereinbefore.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: June 14, 1988
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Saegusa Takeo, Jiro Horikawa, Masahiro Niwano, Takenobu Kanazawa
  • Star block copolymer from lactam and polyol and process for the production thereof
    Patent number: 4650608
    Abstract: A novel star block copolymer represented by the general formula as shown below and a process for the production thereof are described. The copolymer has superior physical properties, particularly impact strength and, furthermore, is reduced in coloration. Thus the copolymer can find numerous uses; for example, it can be used in preparation of fibers, foams, automotive parts, and electrical components. The copolymer is produced by copolymerizing a star-shaped polyether prepolymer and a lactam, said prepolymer being prepared by reacting a star-shaped polyoxyalkylene having at least 3 terminal hydroxy groups and an N-chlorocarbonyl lactam, in the presence of an anionic polymerization catalyst. ##STR1## In this formula, all the symbols are as defined hereinbefore.
    Type: Grant
    Filed: August 6, 1985
    Date of Patent: March 17, 1987
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Saegusa Takeo, Jiro Horikawa, Masahiro Niwano, Takenobu Kanazawa