Patents by Inventor Haruki Kawada

Haruki Kawada 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 modifying conjugated diene polymers
    Patent number: 4647625
    Abstract: A process for modifying a polymer of a conjugated diene, which comprises reacting a polymer of a conjugated diene containing at least one metal selected from alkali metals and alkaline earth metals with a compound having a linkage of the following formula ##STR1## wherein X represents an oxygen or sulfur atom, in the molecule.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: March 3, 1987
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Hiroyuki Watanabe, Haruki Kawada, Kohkichi Noguchi, Akio Ueda, Shuichi Akita, Tetsuo Ohyama, Toshio Kase
  • Process for modifying rubbers employing a compound containing a carboxyl and an aldehyde group
    Patent number: 4412041
    Abstract: A process for modifying a rubber, which comprises reacting a rubber having an unsaturated carbon linkage with an organic compound having a carboxyl group and an aldehyde group in the presence of an acid catalyst.
    Type: Grant
    Filed: February 18, 1983
    Date of Patent: October 25, 1983
    Assignee: Nippon Zeon Co. Ltd.
    Inventors: Shizuo Kitahara, Yoshitsugu Hirokawa, Haruki Kawada, Toshihiro Fujii, Nagatoshi Sugi, Hiroaki Hasegawa, Akira Yoshioka
  • Modified rubber composition employing a compound containing a carboxyl and an aldehyde group
    Patent number: 4412031
    Abstract: A modified rubber composition comprising a blend of (a) a modified rubber obtained by reaction a rubber having an unsaturated carbon linkage with an organic compound having a carboxyl group and an aldehyde group in the presence of an acid catalyst, and (b) carbon black.
    Type: Grant
    Filed: February 18, 1983
    Date of Patent: October 25, 1983
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Shizuo Kitahara, Yoshitsugu Hirokawa, Haruki Kawada, Toshihiro Fujii, Nagatoshi Sugi, Hiroaki Hasegawa, Akira Yoshioka