Patents by Inventor Huashi T. Zhang

Huashi T. Zhang 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).

  • Method for making hydrophobically associative polymers, methods of use and compositions
    Patent number: 6417268
    Abstract: Method for producing an hydrophobically associative polymer is provided which is characterized by forming a monomer solution comprising a surfactant, at least one hydrophobic ethylenically unsaturated monomer, at least one hydrophilic monomer selected from nonionic ethylenically monomers, cationic ethylenically unsaturated monomers, anionic ethylenically unsaturated monomers or mixtures thereof, and water; forming a salt solution comprising a multivalent salt and water; mixing the monomer solution and salt solution to form a mixed solution; and charging the mixed solution with an initiator, thereby polymerizing the monomers to form the hydrophobically associative polymer in a dispersion. Aqueous dispersion containing the hydrophobically associative polymer formed by the method.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: July 9, 2002
    Assignee: Hercules Incorporated
    Inventors: Huashi T. Zhang, Baraka A. Kawawa, Fu Chen
  • Method for using hydrophobically associative polymers in preparing cellulosic fiber compositions, and cellulosic fiber compositions incorporating the hydrophobically associative polymers
    Publication number: 20020053413
    Abstract: A papermaking method and a composition which utilize, as a drainage aid, a water soluble hydrophobically associative polymer which is a copolymer prepared from monomers which include a hydrophobic ethylenically unsaturated monomer, and one or more of a nonionic ethylenically unsaturated monomer, a cationic ethylenically unsaturated monomer, and an anionic ethylenically unsaturated monomer.
    Type: Application
    Filed: December 6, 2000
    Publication date: May 9, 2002
    Inventors: Huashi T. Zhang, John C. Harrington