Patents by Inventor Isaburou Higashi

Isaburou Higashi 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).

  • Polyester carbonate copolymers, processes for preparing same and polyester resin compositions containing said copolymers
    Patent number: 5010146
    Abstract: In accordance with the present invention, there are provided polyester carbonate copolymers obtained by polymerization of a mixture of 20-80% by weight of an alkylene terephthalate oligomer [I] containing ethylene terephthalate as main structural units and having an intrinsic viscosity [.eta.], as measured at 25.degree. C. in o-chlorophenol, of less than 0.6 dl/g, and 20-80% by weight of a carbonate oligomer [II] containing 2,2-bis(4 -hydroxyphenyl)propane as main structural units and having an intrinsic viscosity [.eta.], as measured at 25.degree. C. in o-chlorophenol, of less than 0.6 dl/g, said copolymers having an intrinsic viscosity [.eta.], as measured at 25.degree. C. in o-chlorophenol, of 0.4-1.2 dl/g and a glass transition temperature (Tg) of 80.degree.-140.degree. C. with a single peak, and polyester resin compositions containing said copolymers, said resin composition being excellent in transparency, heat resistance and mechanical strength.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: April 23, 1991
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Masaki Kohsaka, Isaburou Higashi, Yoshinori Akana, Mikio Hashimoto, Tadao Yatsu