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:
Apr. 27, 1993
Filed:
Dec. 28, 1990
Applicant:
Inventors:
Paul A Damrow, Walnut Creek, CA (US);
Robert D Mahoney, Danville, CA (US);
H Nelson Beck, Walnut Creek, CA (US);
Mark F Sonnenschein, Antioch, CA (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264 28 ; 21050027 ; 21050028 ; 21050041 ; 264 41 ; 264184 ; 264203 ; 2642103 ; 2642104 ; 2642106 ; 26421118 ; 26421119 ; 2642112 ; 264216 ; 264235 ; 2642356 ; 264346 ;
Abstract
The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(etheretherketone)-type polymer by forming a mixture of an unsulfonated poly(etheretherketone)-type polymer, an amorphous polymer, and a plasticizer, heating the resulting mixture, extruding or casting the mixture into a membrane, quenching or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, and/or after leaching.