Patents by Inventor Neal S. Williams

Neal S. Williams 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).

  • Process for producing a coating composition
    Patent number: 6034157
    Abstract: A process for producing an aqueous coating composition comprising an aqueous dispersion of internally crosslinked polymer microgel particles in which the microgel articles are produced by emulsion polymerisation of ethylenically unsaturated monomers including carboxyl functional monomer in an aqueous medium so as to form an aqueous dispersion of carboxyl functional addition polymer followed by reacting this polymer dispersion with a diepoxide resin having an epoxide equivalent weight between 100 and 5000 to form the crosslinked polymer microgel particles.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: March 7, 2000
    Assignee: Imperial Chemical Industries, Plc.
    Inventors: Gary P. Craun, Neal S. Williams
  • Aqueous microgel from carboxyl latex polymer, acrylic-epoxy and diepoxide
    Patent number: 5877239
    Abstract: An aqueous protective coating composition particularly useful for can coatings based on a polymeric binder comprises diepoxide crosslinked microgel particles. The microgel polymer is produced by dispersing into water a carboxyl functional acrylic-epoxy copolymer and combined with a carboxyl functional latex polymer along with a low molecular weight diepoxide, followed by coreaction and crosslinking between the carboxyl polymers and the diepoxide to form stable aqueous dispersed microgel particles. In a preferred aspect of the invention, the carboxyl latex polymer is a swollen latex polymer.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: March 2, 1999
    Assignee: The Glidden Company
    Inventors: Gary P. Craun, Beth A. Smith, Neal S. Williams