Patents by Inventor Toshihiko Takaki

Toshihiko Takaki 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).

  • Admixture for hydraulic cement
    Patent number: 5489626
    Abstract: A hydraulic cement composition comprising as an effective component a water-soluble amphoteric polymer obtained by Hofmann degradation reaction of an .alpha.,.beta.-unsaturated carbonamide polymer or a copolymer of .alpha.,.beta.-unsaturated carbonamide and an anionic monomer having a weight average molecular weight of 1,000-1,000,000.The primary amino group produced as a result of the Hofmann degradation reaction provides excellent cement dispersing capabilities.
    Type: Grant
    Filed: November 18, 1994
    Date of Patent: February 6, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Toshihiko Takaki, Kenji Tsuboi, Tsugio Matsubara, Atsushi Ito, Shouichi Araseki
  • Catonic acrylamide polymers and the applications of these polymers
    Patent number: 5292821
    Abstract: This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time.This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and, N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: March 8, 1994
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta
  • Cationic acrylamide polymers and the applications of these polymers
    Patent number: 5239014
    Abstract: This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time.This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.
    Type: Grant
    Filed: July 3, 1991
    Date of Patent: August 24, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta
  • Method of manufacturing cationic acrylamide polymers, cationic acrylamide polymers, and the applications of these polymers
    Patent number: 5039757
    Abstract: This invention provides cationic acrylamide polymers which are highly effective as paper strength agents, drainage agents and suspension flocculants, and which do not show much temporal deterioration; it also provides a method of manufacturing said polymers wherein the manufacturing equipment is compact and can be installed on site, and the cationicity of the polymers can be modified in a short time.This invention comprises a method of manufacturing cationic acrylamide polymers by reaction, with a hypohalogenite, of a (meth)acrylamide homopolymer, a copolymer of (meth)acrylamide and acrylonitrile, a copolymer of (meth)acrylamide and N,N-dimethylacrylamide, in a high temperature range of 50.degree.-110.degree. C. for a short time; the polymers manufactured by said process; and paper strength agents, drainage agents and flocculants having these polymers as their principal constituent.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: August 13, 1991
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Toshihiko Takaki, Kenji Tsuboi, Hiroshi Itoh, Atsuhiko Nitta