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:
Sep. 21, 1993
Filed:
Aug. 19, 1991
Henry N Beck, Walnut Creek, CA (US);
Robert D Mahoney, Danville, CA (US);
Hawk S Wan, Antioch, CA (US);
Chieh-Chun Chau, Midland, MI (US);
Timothy M Finney, Midland, MI (US);
Ritchie A Wessling, Berkeley, CA (US);
Jiro Kawamoto, Walnut Creek, CA (US);
Mark F Sonnenschein, Antioch, CA (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The present invention relates to a process for preparing a microporous permselective membrane from a poly(phenylene sulfide) (PPS) polymer, an organic compound which substantially solubilizes the PPS below its melting point to form a homogenous mixture, heating the resulting mixture, extruding or casting the mixture into a membrane (fiber or film), quenching or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, after leaching, or a combination thereof. In one embodiment, the solvent optionally includes an organic non-solvent to assist in obtaining the desired microporsity. The permselective polymers are useful to separate gaseous or liquid components from a mixture of components.