Patents by Inventor Toshiki Oyanagi

Toshiki Oyanagi 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).

  • Organic polymer/inorganic fine particle-dispersed aqueous solution having excellent stability and uses thereof
    Patent number: 6593408
    Abstract: An organic polymer/inorganic fine particle-dispersed aqueous solution having excellent dispersion stability comprising a water-slightly soluble inorganic fine particle (B) having a particle diameter of 500 nm or less obtained by reacting (a) a compound of a second group element in the periodic table with (b) at least one compound selected from organic acids, inorganic acids and salts thereof in the presence of a water-soluble or water-dispersible synthetic high molecular compound (A) having a carboxyl group in a proportion of (A):(B)=10:90 to 99.99:0.01 (weight ratio). The above dispersed aqueous solution can be used as a paper-making chemical, an ink jet recording chemical, medical materials and cosmetic raw materials.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: July 15, 2003
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Toshihiko Takaki, Masaru Tanabe, Hiroshi Itoh, Toshiki Oyanagi
  • Polymer and applications thereof
    Patent number: 6255400
    Abstract: A polymer (B) is prepared by polymerizing one or more vinyl monomers (c) in the presence of a polymer (A) prepared by polymerizing one or more vinyl monomers (a) selected from the group consisting of vinyl monomers represented by the general formula (1): wherein R1 represents a hydrogen atom or a lower alkyl with 1 to 3 carbon atoms and n is an integer of 1 to 8 and their salts with one or more vinyl monomers (b) which are co-polymerizable with the vinyl monomer components (a).
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: July 3, 2001
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hiroshi Itoh, Susumu Oyama, Takashi Yodoya, Kenji Tsuboi, Tsugio Matsubara, Kenichi Nakamura, Hirotoshi Doki, Shinya Yamagami, Toshiki Oyanagi, Kenzo Seita
  • Acrylamide polymers and use thereof
    Patent number: 5942573
    Abstract: Provided by this invention are an acrylamide polymer which has a weight-average molecular weight (a) of from 1,500,000 to 10,000,000 and a weight-average inertial radius (b) of from 30 to 150 nm, the ratio (b)/(a) of the weight-average inertial radius (b) to the weight-average molecular weight (a) being 0.00004 or smaller; and an aqueous solution of an acrylamide polymer which solution has a polymer concentration ranging from 22 to 60%, a Brookfield viscosity at 25.degree. C. of 50,000 cps or smaller and a weight-average molecular weight of from 500,000 to 10,000,000. They are useful as paper strength agents.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: August 24, 1999
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Hirotoshi Doki, Hitoshi Ishigaki, Toshiki Oyanagi, Tsugio Matsubara, Shigeo Watanabe
  • Acrylamide polymers and use thereof
    Patent number: 5627249
    Abstract: Provided by this invention are an acrylamide polymer which has a weight-average molecular weight (a) of from 1,500,000 to 10,000,000 and a weight-average inertial radius (b) of from 30 to 150 nm, the ratio (b)/(a) of the weight-average inertial radius (b) to the weight-average molecular weight (a) being 0.00004 or smaller; and an aqueous solution of an acrylamide polymer which solution has a polymer concentration ranging from 22 to 60%, a Brookfield viscosity at 25.degree. C. of 50,000 cps or smaller and a weight-average molecular weight of from 500,000 to 10,000,000. They are useful as paper strength agents.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: May 6, 1997
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hirotoshi Doki, Hitoshi Ishigaki, Toshiki Oyanagi, Tsugio Matsubara, Shigeo Watanabe
  • Water-resistant surface coating formulations and paper coated therewith
    Patent number: 5587246
    Abstract: The present invention provides a water-resistant surface coating formulation comprising a reaction product obtained by subjecting an acrylamide polymer to a crosslinking reaction with 0.1 to 20 parts by mole, per 100 parts by mole of amido groups in the acrylamide polymer, of a glyoxalmonoureine; a method for improving the water resistance of paper by using the formulation; and coated paper so obtained. As a result of improved water resistance of the coating formulation, this invention makes it possible to conduct coating work stably.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: December 24, 1996
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Haruki Tsutsumi, Yoshiaki Ikemoto, Mitsuhiro Maehama, Toshiki Oyanagi, Tsugio Matsubara
  • Water-resistant surface coating formulations and paper coated therewith
    Patent number: 5470918
    Abstract: The present invention provides a water-resistant surface coating formulation comprising a reaction product obtained by subjecting an acrylamide polymer to a crosslinking reaction with 0.1 to 20 parts by mole, per 100 parts by mole of amido groups in the acrylamide polymer, of a glyoxalmonoureine; a method for improving the water resistance of paper by using the formulation; and coated paper so obtained. As a result of improved water resistance of the coating formulation, this invention makes it possible to conduct coating work stably.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: November 28, 1995
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Haruki Tsutumi, Yoshiaki Ikemoto, Mitsuhiro Maehama, Toshiki Oyanagi, Tsugio Matsubara