Patents by Inventor Takeyo Sakai

Takeyo Sakai 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).

  • Aqueous amphoteric polyurethane having blocked NCO groups and process
    Patent number: 4036801
    Abstract: An aqueous amphoteric polyurethane emulsion is prepared by reacting an isocyanate-terminated urethane prepolymer with an excess of a polyalkylene polyamine to form a polyurethane-urea-polyamine; reacting a portion of the free amino groups contained in the resulting product with a blocked polyisocyanate having one free isocyanate group; rendering the remaining amino groups contained in the resulting product amphoteric either (I) by reacting said amino groups with a compound selected from the group consisting of 1,3-propane sultone, 1,4-butane sultone, .beta.-propiolactone, .gamma.-butyrolactone, .epsilon.-caprolactone, .delta.-valerolactone and a monohalogenated sodium carboxylate having the formulaX(CH.sub.2).sub.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: July 19, 1977
    Assignee: Kao Soap Co., Ltd.
    Inventors: Kazuo Matsuda, Hidemasa Ohmura, Takeyo Sakai
  • Aqueous cationic polyurethane having blocked NCO groups and process
    Patent number: 4016120
    Abstract: Aqueous cationic polyurethane emulsions are prepared by reacting an isocyanate-terminated urethane prepolymer with an excess of a polyalkylene polyamine to form a polyurethane-urea-polyamine, and then partially reacting the free amino groups in said product with a blocked polyisocyanate having a single free isocyanate group, followed by mixing with an aqueous solution of an acid.
    Type: Grant
    Filed: July 12, 1976
    Date of Patent: April 5, 1977
    Assignee: Kao Soap Co., Ltd.
    Inventors: Kazuo Matsuda, Hidemasa Ohmura, Takeyo Sakai
  • Anionic aqueous polyurethane having blocked NCO groups and process
    Patent number: 4016122
    Abstract: An aqueous anionic polyurethane emulsion is prepared by reacting an isocyanate-terminated urethane prepolymer with an excess of a polyalkylene polyamine thereby to form a polyurethane-urea-polyamine, reacting a portion of the free amino groups of said polyurethane-urea-polyamine with a blocked polyisocyanate having a single free isocyanate group, reacting the resulting product with a cyclic dicarboxylic acid anhydride, and mixing the resulting product with an aqueous solution of a basic substance.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: April 5, 1977
    Assignee: Kao Soap Co., Ltd.
    Inventors: Kazuo Matsuda, Hidemasa Ohmura, Takeyo Sakai
  • Aqueous polyurethane having blocked NCO groups and process
    Patent number: 4016121
    Abstract: An aqueous polyurethane emulsion is prepared by reacting a polyhydroxyl component containing 15 to 80% by weight of a polyoxyethylene glycol having a molecular weight of 200 to 10,000 with an excess of an organic polyisocyanate to obtain an isocyanate-terminated urethane prepolymer, reacting that prepolymer with an excess of a polyalkylene polyamine thereby to form a polyurethane-urea-polyamine, reacting the free amino groups in the polyurethane-urea-polyamine with a blocked polyisocyanate having a single free isocyanate group, and mixing the resulting product with water, or reacting said resulting product with a cyclic dicarboxylic acid anhydride followed by mixing with water.
    Type: Grant
    Filed: July 12, 1976
    Date of Patent: April 5, 1977
    Assignee: Kao Soap Co., Ltd.
    Inventors: Kazuo Matsuda, Hidemasa Ohmura, Takeyo Sakai