The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 1992
Filed:
May. 22, 1990
Michael D Cliffton, Kingsport, TN (US);
Jerry O Reed, Bartlesville, OK (US);
Rex L Bobsein, Bartlesville, OK (US);
Jon F Geibel, Bartlesville, OK (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
Aromatic sulfide/ketone polymer is prepared from dihaloaromatic ketone, alkali metal sulfide, water and a polar organic compound. The polymerization reaction mixture comprising the aromatic sulfide/ketone polymer is subjected to a heat soak at elevated temperature then a separation agent (non-solvent) is added under controlled conditions and subsequently cooled to provide a mixture comprising particulate aromatic sulfide/ketone polymer. Biaxially-oriented film is made from recovered particles of aromatic sulfide/ketone polymer prepared as described by (1) washing the polymer particles with an aqueous calcium salt, (2) heating said washed particles to remove water, wherein the resulting heated particles are at least partially crystalline, (3) molding said heating particles to form a sheet of polymer, (4) biaxially stretching said sheet above the glass transition temperature of the polymer to form a film, and (5) heat-setting said biazially-oriented film under stretching tension for a time and at a temperature to increase strength properties and density.