Patents by Inventor Masahiro Kouchi

Masahiro Kouchi 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).

  • Composition for increasing wet strength of paper including water-soluble blocked urethane prepolymers
    Patent number: 7008508
    Abstract: For use as a wet strength agent, a water-soluble blocked urethane prepolymer having a hydrophilic group and a blocked isocyanate group is combined with a cationic charge-adjusting agent. The adsorption and retention of the water-soluble blocked urethane prepolymer to cellulosic fiber are promoted by virtue of the cationic charge adjusting agent when the wet strength agent is added to a paper-making stock.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: March 7, 2006
    Assignee: Dai Ichi Kogyo Seiyaku Co.
    Inventors: Takeshi Doi, Takeshi Miyamura, Masahiro Kouchi
  • Composition for increasing wet strength of paper including water-soluble blocked urethane prepolymers
    Publication number: 20030083427
    Abstract: For use as a wet strength agent, a water-soluble blocked urethane prepolymer having a hydrophilic group and a blocked isocyanate group is combined with a cationic charge-adjusting agent. The adsorption and retention of the water-soluble blocked urethane prepolymer to cellulosic fiber are promoted by virtue of the cationic charge adjusting agent when the wet strength agent is added to a paper-making stock.
    Type: Application
    Filed: July 18, 2002
    Publication date: May 1, 2003
    Applicant: Dai-ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Takeshi Doi, Takeshi Miyamura, Masahiro Kouchi
  • Blocked urethane prepolymers as paper wet strength agent
    Patent number: 6488813
    Abstract: Paper with increased wet strength is produced by adding to the stock a water soluble blocked urethane prepolymer having a plurality of blocked isocyanate groups and hydrophilic groups. The blocking agent is a phenol compound having an electron-attracting group at the ortho- or para-position. The blocked urethane prepolymer is capable of unblocking under such conditions that encounter in the drying part of conventional paper making machines.
    Type: Grant
    Filed: July 31, 2001
    Date of Patent: December 3, 2002
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Takeshi Doi, Naofumi Saiuchi, Masahiro Kouchi
  • Blocked urethane prepolymers as paper wet strength agent
    Publication number: 20020088583
    Abstract: Paper with increased wet strength is produced by adding to the stock a water soluble blocked urethane prepolymer having a plurality of blocked isocyanate groups and hydrophilic groups. The blocking agent is a phenol compound having an electron-attracting group at the ortho- or para-position. The blocked urethane prepolymer is capable of unblocking under such conditions that encounter in the drying part of conventional paper making machines.
    Type: Application
    Filed: July 31, 2001
    Publication date: July 11, 2002
    Applicant: Dai-ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Takeshi Doi, Naofumi Saiuchi, Masahiro Kouchi