Patents by Inventor Mutsumi Kawano

Mutsumi Kawano 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 the preparation of dispersion of water-soluble cationic polymer
    Patent number: 5006590
    Abstract: The present invention relates to the preparation of a dispersion wherein a copolymer comprising an acrylic monomer containing a dialkylbenzylammonium group is dispersed in an aqueous solution of a salt as fine particle. Two cationic polymers are used in the polymerization of the above monomer in the aqueous solution of a salt. One of the cationic polymers is a (co)polymer comprising an acrylic monomer containing a trialkylammonium group which is soluble both in the aqueous solution of a salt and in water, while the other thereof is a copolymer comprising an acrylic monomer containing a dialkylbenzylammonium group which is soluble in water, but insoluble in the aqueous solution of a salt. The above aqueous solution of a salt is an aqueous solution of a polyvalent anion salt such as sulfate or phosphate. A dispersion of a water-soluble cationic polymer can be prepared by dissolving the above monomer in the aqueous solution and carrying out the polymerization in the presence of the above two polymers.
    Type: Grant
    Filed: September 28, 1989
    Date of Patent: April 9, 1991
    Assignee: Kyoritsu Yuki Co., Ltd.
    Inventors: Hisao Takeda, Mutsumi Kawano
  • Process for production of water-soluble polymer dispersion
    Patent number: 4929655
    Abstract: A process for preparing a water-soluble polymer dispersion is here provided which is characterized by polymerizing water-soluble monomers of 5 to 1000 mole % of a cationic monomer represented by formula (I) defined herein, 0 to 50 mole % of another cationic monomer represented by formula (II) defined herein and 0 to 95 mole % of (meth)acrylamide in the presence of 1 to 10% by weight of an organic high-molecular multivalent cation based on the total weight of the monomers in a multivalent anionic salt aqueous solution having a concentration of 15% by weight or more.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: May 29, 1990
    Assignee: Kyoritsu Yuki Co., Ltd.
    Inventors: Hisao Takeda, Mutsumi Kawano
  • Cationic polymer flocculant
    Patent number: 4370464
    Abstract: Novel cationic polymer flocculants are prepared by polycondensation of an epihalohydrin and mixed Mannich reaction products of a monohydric phenol and bisphenol with formaldehyde and dialkylamine. The flocculants are stable in aqueous solutions and show an excellent effect in purification of industrial effluents.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: January 25, 1983
    Assignees: Kyoritsu Yuki Co., Ltd., Mitsubishi Chemical Industries, Ltd.
    Inventors: Katsutoshi Tanaka, Hisao Takeda, Mutsumi Kawano, Isao Miyahara
  • Cationic polymer flocculant prepared by reacting epichlorohydrin and a Mannich reaction product
    Patent number: 4155847
    Abstract: New cationic flocculants are prepared by polycondensation of an epihalohydrin and Mannich reaction products of phenol, formaldehyde, and dialkylamine. The flocculants are useful for flocculation of various kinds of suspension such as various industrial waste waters, pulp slurry in paper making and the like.
    Type: Grant
    Filed: August 10, 1978
    Date of Patent: May 22, 1979
    Assignees: Mitsubishi Chemical Industries, Ltd., Kyoritsu Yuki Co., Ltd.
    Inventors: Katsutoshi Tanaka, Hisao Takeda, Mutsumi Kawano, Isao Miyahara