Patents by Inventor Yukihiko Morozumi

Yukihiko Morozumi 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).

  • Rubbery copolymer, process for production thereof, and vulcanizable elastomer composition
    Patent number: 5019630
    Abstract: A novel rubbery copolymer comprising (A) 5 to 95% by weight of structural units based on 1,1-dicyano-2-vinylcyclopropane and (B) 95 to 5% by weight of structural units based on a 1,1-difluoro-2-vinylcyclopropane and having a weight average molecular weight, calculated for standard polystyrene, of 2,000 to 2,000,000 is provided by copolymerizing the 1,1-dicyano-2-vinylcyclopropane and the 1,1-difluoro-2-vinylcyclopropanes in the presence of a free radical initiator. This rubbery copolymer and its hydrogenated product give a vulcanizate having improved oil resistance, cold resistance, thermal resistance, sour gasoline resistance, alcohol-containing gasoline resistance and alcohol-containing sour gasoline resistance.
    Type: Grant
    Filed: October 24, 1989
    Date of Patent: May 28, 1991
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Takeshi Chida, Mitsuyoshi Aonuma, Akio Maeda, Yukihiko Morozumi, Tetsu Ohishi