Patents by Inventor Seiichi Nakahama

Seiichi Nakahama 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).

  • Polymers of substituted 1,3-butadiene compounds having reactive silyl groups and process for their preparation
    Patent number: 4730031
    Abstract: A polymer obtained by the polymerization of a substituted 1,3-butadiene compound of the formula: ##STR1## wherein each of X.sub.1 and X.sub.2 is hydrogen or SiR.sub.1 R.sub.2 R.sub.3, provided that at least one of X.sub.1 and X.sub.2 is SiR.sub.1 R.sub.2 R.sub.3, wherein each of R.sub.1, R.sub.2 and R.sub.3 is halogen, lower alkyl or lower alkoxy, provided that R.sub.1, R.sub.2 and R.sub.3 are not lower alkyl at the same time.
    Type: Grant
    Filed: January 23, 1986
    Date of Patent: March 8, 1988
    Assignee: Nissan Chemical Industries Ltd.
    Inventors: Fumie Sato, Seiichi Nakahama, Akira Hirao, Misao Miyamoto, Kenichi Osawa, Toshihiro Ishii
  • Cyclic sulfur compounds
    Patent number: 4339590
    Abstract: A cyclic sulfur compound represented by the formula, ##STR1## wherein R is --CH.sub.2 CH.sub.2 O).sub.n CH.sub.2 CH.sub.2 --, m is an integer of 2 to 4 and n is an integer of 1 to 3 is novel and can be used as a crosslinking agent instead of sulfur per se and also as a monomer for preparing polysulfide polymer. Said cyclic sulfur compound can be produced by reacting a metal sulfide represented by the formula, ##STR2## wherein R is the same as defined above, R' and R" are independently selected from alkyl groups and aryl groups and M is silicon or tin, with a halogen, sulfur dichloride or sulfur monochloride.
    Type: Grant
    Filed: January 21, 1981
    Date of Patent: July 13, 1982
    Assignee: Japan Synthetic Rubber Company, Limited
    Inventors: Noboru Yamazaki, Seiichi Nakahama, Kazuo Yamaguchi