Patents by Inventor Masasi Nakagire

Masasi Nakagire 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).

  • Hydrolyzed ethylene-vinyl acetate copolymer
    Patent number: 4931500
    Abstract: A hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60% by mole and a defree of hydrolysis in the vinyl acetate component of at least 95% by mole, having an ash content of not more than 20 ppm and an alkali metal content of not more than 5 ppm, and having a ratio of the melt viscosity at 220.degree. C. after maintaining the copolymer at 220.degree. C. for 60 minutes to the melt viscosity at 220.degree. C. after maintaining the copolymer at 220.degree. C. for 5 minutes of 1.0 to 1.5. The hydrolyzed copolymer of the invention can give the films whose gas impermeability is not lowered even at high humidity, and is applicable to long-run molding.
    Type: Grant
    Filed: August 19, 1988
    Date of Patent: June 5, 1990
    Assignee: Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha
    Inventors: Shinji Okamoto, Masaaki Minakawa, Youiti Neki, Masasi Nakagire