Patents Represented by Law Firm Barris, Doane, Swecker & Mathis
  • Process for preparing film of poly{[benzo(1,2-d:4,5-d')bisthiazole-2,6-diyl]-1,4-phenylene}, its cis isomer or mixtures thereof
    Patent number: 4487735
    Abstract: A film of poly{[benzo(1,2-d:4,5-d')bisthiazole-2,6-diyl]-1,4-phenylene}, its cis isomer or mixtures thereof is formed by extruding a solution of the polymer on a casting roll which is rotating to yield a surface speed slightly greater than the rate of extrusion. The solution of the polymer may be prepared by dissolving the polymer in an appropriate solvent or by reacting the monomers in a selected reaction medium. The cast film is washed, subjected to an elevated temperature, preferably heat treated under tension, and recovered.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: December 11, 1984
    Assignee: Celanese Corporation
    Inventors: Edward C. Chenevey, Ronald Kafchinski