Patents by Inventor Brian J. Roulstone

Brian J. Roulstone 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).

  • Polymer-modified particulate titanium dioxide
    Patent number: 5534585
    Abstract: The tendency for hard and irregular particles of titanium dioxide pigment to adversely affect the sheen and coin mar resistance of a dried coating into which they have been incorporated is reduced by modifying the particles with polymer particles which have been preformed and are therefore of a more pre-determinable shape and size. The polymer particles are chemically bonded to a polymeric water-soluble compound containing moieties which are adsorbable onto the titanium dioxide particles so that on mixing a colloidally stabilised aqueous dispersion of the polymer particles with a colloidally stabilised aqueous dispersion of titanium dioxide particles, the moieties adsorb onto the titanium dioxide to form a colloidally stable aqueous dispersion of polymer-modified titanium dioxide which is useful in coating compositions.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: July 9, 1996
    Assignee: Imperial Chemical Industries PLC
    Inventors: Brian J. Roulstone, Julian A. Waters
  • Polymer-modified particulate titanium dioxide
    Patent number: 5412019
    Abstract: The tendency for hard and irregular particles of titanium dioxide pigment to adversely affect the sheen and coin mar resistance of a dried coating into which they have been incorporated is reduced by modifying the particles with polymer particles which have been preformed and are therefore of a more pre-determinable shape and size. The polymer particles are chemically bonded to a polymeric water-soluble compound containing moieties which are adsorbable onto the titanium dioxide particles so that on mixing a colloidally stabilised aqueous dispersion of the polymer particles with a colloidally stabilised aqueous dispersion of titanium dioxide particles, the moieties adsorb onto the titanium dioxide to form a colloidally stable aqueous dispersion of polymer-modified titanium dioxide which is useful in coating compositions.
    Type: Grant
    Filed: January 31, 1994
    Date of Patent: May 2, 1995
    Assignee: Imperial Chemical Industries PLC
    Inventors: Brian J. Roulstone, Julian A. Waters