Patents Examined by Howard J. Smith
  • Multi-stage anionic dispersion homopolymerization to form microparticles with narrow size distribution
    Patent number: 4829135
    Abstract: Styrene or other anionically polymerizable monomer is anionically homopolymerized in a dispersion using a non-solvent, e.g., hexane using three or more stages to obtain spherical microparticles, e.g., 2-5 microns, with a narrow size distribution.
    Type: Grant
    Filed: December 29, 1987
    Date of Patent: May 9, 1989
    Assignee: Mobil Oil Corporation
    Inventors: Binnur Z. Gunesin, James G. Murray, Frederick C. Schwab, Ronald J. Gustafson