Patents Assigned to The Univ. of Deleware
  • Preparation of homogeneous polymers using supercritical fluid solutions
    Patent number: 5412027
    Abstract: Homogeneous polymer blends are prepared from otherwise thermodynamically immiscible polymers, especially including block copolymers. Thus, polymers such as polystyrene/poly(methyl methacrylate) block copolymer or polystyrene/poly(1,2-butadiene) block copolymer are dissolved under pressure in supercritical fluid solvents such as chlorodifluoromethane and n-butane, respectively, and expanded through a fine nozzle. As the SCF solvent evaporates, the polymer deposits as a substantially homogeneous material.
    Type: Grant
    Filed: November 19, 1993
    Date of Patent: May 2, 1995
    Assignees: The Procter & Gamble Company, The Univ. of Deleware
    Inventors: Annetta D. Shine, Steven D. Smith, Isao Noda