Patents by Inventor Eiji Ihara

Eiji Ihara 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).

  • Process for Preparing block copolymer of monoolefin
    Patent number: 5563219
    Abstract: A process for preparing a block copolymer of an .alpha.-olefin and a vinyl compound is here disclosed which comprises the steps of polymerizing an olefin selected from ethylene and the .alpha.-olefin having 3 or more carbon atoms by the use of a divalent or a trivalent rare earth metal complex, and then polymerizing a vinyl compound, a vinylidene compound or a lactone. According to the process of the present invention, a polar group can be introduced into a polyolefin, whereby the characteristics of the polymer can be effectively improved.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: October 8, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hajime Yasuda, Eiji Ihara