Patents by Inventor I. Cheng Chu

I. Cheng Chu 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 graft copolymer pigment dispersants
    Patent number: 5231131
    Abstract: A pigment dispersion useful for forming coating compositions containing dispersed pigment, an aqueous carrier and a graft copolymer dispersant; wherein the graft copolymer has a weight average molecular weight of about 5,000-100,000 and has a polymeric backbone and macromonomer side chains attached to the backbone wherein(1) the polymeric backbone is hydrophobic in comparison to the side chains and contains polymerized ethylenically unsaturated hydrophobic monomers and up to 20% by weight, based on the weight of the graft copolymer, of polymerized ethylenically unsaturated acid containing monomers; and(2) the sidechains are hydrophilic macromonomers attached to the backbone at a single terminal point and contain polymerized ethylenically unsaturated monomers and 2-100% by weight, based on the weight of the graft copolymer, of polymerized ethylenically unsaturated acid containing monomers and have a weight average molecular weight of about 1,000-30,000 and wherein the acid groups of the graft copolymer are neu
    Type: Grant
    Filed: December 24, 1991
    Date of Patent: July 27, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: I. Cheng Chu, Michael Fryd, Laurie E. Lynch