Patents by Inventor Yoshio Kokue

Yoshio Kokue 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).

  • Method for the production of low density polyethylene
    Patent number: 4128607
    Abstract: In producing a low density polyethylene by copolymerization in slurry state of ethylene and an .alpha.-olefin with use of a catalyst consisting of a supported titanium component and an organoaluminum compound, a certain amount of ethylene is subject to pre-polymerization in the presence of said catalyst prior to the copolymerization. Successively, the copolymerization of ethylene and an .alpha.-olefin is effected in a two-step process, in which a copolymerization ratio of .alpha.-olefin to ethylene is kept at a low level in the first step and raised to a high level in the second step thereby to obtain a low density polyethylene having a density of not higher than 0.945 g/cm.sup.3.
    Type: Grant
    Filed: April 6, 1977
    Date of Patent: December 5, 1978
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tetsunosuke Shiomura, Youzou Kinoshita, Yoshio Kokue