Patents Examined by Peter D. Molcaly
  • Fluorine-containing copolymer
    Patent number: 4703095
    Abstract: A fluorine-containing copolymer comprising monomeric units of:(a) tetrafluoroethylene,(b) 8 to 15% by weight of hexafluoropropene on the basis of the weight of the copolymer, and(c) 0.2 to 2% by weight of a fluoroalkyl vinyl ether of the formula:CF.sub.2 .dbd.CF--O--(CF.sub.2).sub.n --CF.sub.2 Xwherein X is hydrogen or fluorine, and n is an integer of 3 to 9, on the basis of the weight of the copolymer, which has good moldability and improved stress crack resistance and flex resistance when formed as an article such as a film.
    Type: Grant
    Filed: February 14, 1986
    Date of Patent: October 27, 1987
    Assignee: Daiken Kogyo Co., Ltd.
    Inventors: Shinichi Nakagawa, Tsuneo Nakagawa, Toshihiko Amano, Mitsugu Omori, Sadaatsu Yamaguchi, Kozo Asano