Patents by Inventor Yoichiro TAKENOSHITA

Yoichiro TAKENOSHITA 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).

  • Chloroprene graft copolymer latex, method for producing same, bonding agent and adhesive
    Patent number: 11028212
    Abstract: Provided is a method for producing a chloroprene graft copolymer latex containing no organic solvent and exhibiting high adhesive strength even for soft polyvinyl chloride. A method for producing a chloroprene graft copolymer latex includes a chloroprene polymerization step of giving a chloroprene polymer latex and a graft copolymerization step of giving a chloroprene graft copolymer latex. The chloroprene polymerization step is a step of subjecting at least chloroprene (A-1) of chloroprene (A-1) and a monomer (A-2) copolymerizable with chloroprene (A-1) to emulsion radical polymerization. The graft copolymerization step is a step of adding, to the chloroprene polymer latex, a (meth)acrylate (B) and an organic peroxide (C) having an octanol/water partition coefficient of ?2.0 or more and 3.0 or less to subject the chloroprene polymer to graft copolymerization with the (meth)acrylate (B) at a temperature of 10° C. or more and 40° C. or less.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: June 8, 2021
    Assignee: SHOWA DENKO K.K.
    Inventors: Naoki Sekioka, Yuya Ohguma, Masanao Kamijo, Yoichiro Takenoshita
  • CHLOROPRENE GRAFT COPOLYMER LATEX, METHOD FOR PRODUCING SAME, BONDING AGENT AND ADHESIVE
    Publication number: 20190169344
    Abstract: Provided is a method for producing a chloroprene graft copolymer latex containing no organic solvent and exhibiting high adhesive strength even for soft polyvinyl chloride. A method for producing a chloroprene graft copolymer latex includes a chloroprene polymerization step of giving a chloroprene polymer latex and a graft copolymerization step of giving a chloroprene graft copolymer latex. The chloroprene polymerization step is a step of subjecting at least chloroprene (A-1) of chloroprene (A-1) and a monomer (A-2) copolymerizable with chloroprene (A-1) to emulsion radical polymerization. The graft copolymerization step is a step of adding, to the chloroprene polymer latex, a (meth)acrylate (B) and an organic peroxide (C) having an octanol/water partition coefficient of ?2.0 or more and 3.0 or less to subject the chloroprene polymer to graft copolymerization with the (meth)acrylate (B) at a temperature of 10° C. or more and 40° C. or less.
    Type: Application
    Filed: August 1, 2017
    Publication date: June 6, 2019
    Applicant: SHOWA DENKO K.K.
    Inventors: Naoki SEKIOKA, Yuya OHGUMA, Masanao KAMIJO, Yoichiro TAKENOSHITA