Patents by Inventor Shouji Matsushima

Shouji Matsushima 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 producing an aqueous dispersion of a water-soluble cationic polymer
    Patent number: 5936042
    Abstract: A process for producing an aqueous dispersion of a water-soluble cationic polymer which process comprises modifying a polymer obtained by homopolymerization of an N-vinylcarboxylic acid amide or copolymerization of an N-vinylcarboxylic acid amide and a vinyl monomer copolymerizable with the N-vinyl carboxylic acid amide with an acid in an aqueous medium in the presence of a nitrate ion. The process can produce an aqueous dispersion of a water-soluble cationic polymer having a high molecular weight from the above water-insoluble polymer easily in a single step without causing adverse effects on the handling property while the fluidity is maintained.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: August 10, 1999
    Assignees: Kurita Water Industries Ltd., Mitsubishi Chemical Corporation
    Inventors: Shouji Matsushima, Katsutoshi Kubo, Masayuki Murano, Satoko Shimada