Patents by Inventor Takuo Sakamoto

Takuo Sakamoto 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).

  • Interpenetrating polymer network structure and polishing pad, and process for producing the same
    Patent number: 8314192
    Abstract: The present invention relates to a process for producing an interpenetrating polymer network structure, which comprises the steps of impregnating a polymer molding with a radical polymerizable composition containing an ethylenically unsaturated compound and a radical polymerization initiator; and polymerizing the ethylenically unsaturated compound in a swollen state of the polymer molding impregnated with the radical polymerizable composition; wherein a chain transfer agent and/or a radical polymerization inhibitor are added to the radical polymerizable composition and/or the polymer molding before impregnating the polymer molding with the radical polymerizable composition. According to the present invention, a highly uniform interpenetrating polymer network structure can be obtained.
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: November 20, 2012
    Assignee: Toray Industries, Inc.
    Inventors: Norikazu Tabata, Kazuhiko Hashisaka, Masahiro Sugimura, Takuo Sakamoto, Masaki Ue, Hiroyuki Nakayama, Seiji Fukuda
  • INTERPENETRATING POLYMER NETWORK STRUCTURE AND POLISHING PAD, AND PROCESS FOR PRODUCING THE SAME
    Publication number: 20090280723
    Abstract: The present invention relates to a process for producing an interpenetrating polymer network structure, which comprises the steps of impregnating a polymer molding with a radical polymerizable composition containing an ethylenically unsaturated compound and a radical polymerization initiator; and polymerizing the ethylenically unsaturated compound in a swollen state of the polymer molding impregnated with the radical polymerizable composition; wherein a chain transfer agent and/or a radical polymerization inhibitor are added to the radical polymerizable composition and/or the polymer molding before impregnating the polymer molding with the radical polymerizable composition. According to the present invention, a highly uniform interpenetrating polymer network structure can be obtained.
    Type: Application
    Filed: July 28, 2006
    Publication date: November 12, 2009
    Inventors: Norikazu Tabata, Kazuhiko Hashisaka, Masahiro Sugimura, Takuo Sakamoto, Masaki Ue, Hiroyuki Nakayama, Seiji Fukuda