Patents by Inventor Zonglai Liu

Zonglai Liu 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).

  • Color-developing agent resin composition, emulsion thereof and method for preparing the same
    Patent number: 7153628
    Abstract: The present invention relates to a color-developing agent resin composition, which contains: (1) a phenolic resin represented by formula I; and (2) a blend of graft copolymers of a phenolic resin and a multivalent metal salt polymer of a substituted aryl carboxylic acid, said graft copolymers are represented by (II) and (III). The present invention further relates to a resin emulsion containing the color-developing agent resin composition and a method for preparing the same. The color-developing agent resin composition and the color-developing agent resin emulsion of the present invention are used for no-carbon copying paper as special resin color-developing agents. They have advantages of not only fast developing at a low temperature and bright colors, but also heavy developing strength and good light-aging resistance of writing, and furthermore, their coatings are not easy to turn yellow when they are hold in the air, and the like.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: December 26, 2006
    Inventors: Zonglai Liu, Chunxuan Guo, Wei Zhang, Yuzhu Liu
  • Color-developing agent resin composition, emulsion thereof and method for preparing the same
    Publication number: 20050095526
    Abstract: The present invention relates to a color-developing agent resin composition, which contains: (1) a phenolic resin represented by formula I; and (2) a blend of graft copolymers of a phenolic resin and a multivalent metal salt polymer of a substituted aryl carboxylic acid, said graft copolymers are represented by (II) and (III). The present invention further relates to a resin emulsion containing the color-developing agent resin composition and a method for preparing the same. The color-developing agent resin composition and the color-developing agent resin emulsion of the present invention are used for no-carbon copying paper as special resin color-developing agents. They have advantages of not only fast developing at a low temperature and bright colors, but also heavy developing strength and good light-aging resistance of writing, and furthermore, their coatings are not easy to turn yellow when they are hold in the air, and the like.
    Type: Application
    Filed: April 8, 2004
    Publication date: May 5, 2005
    Inventors: Zonglai Liu, Chunxuan Guo, Wei Zhang, Yuzhu Liu