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:
Aug. 11, 1981
Filed:
Oct. 18, 1979
Japan Exlan Company Ltd., Osaka, JP;
Sumitomo Chemical Company, Ltd., Osaka, JP;
Abstract
A process for producing polyacrylonitrile membranes for use in reverse osmosis, which comprises dissolving an acrylonitrile polymer in formamide (FA)-containing dimethylformamide (DMF) to prepare an acrylonitrile polymer solution for membrane formation; shaping the solution into a membranous product of a desired form while maintaining the temperature of the solution within a specific range; removing the solvent from the membranous product under a specified solvent removal condition (solidifying condition); subjecting the thus-obtained membrane to a heat treatment, and further to a plasma treatment. The polyacrylonitrile membrane thus obtained is asymmetric and porous in structure, and excellent both in separation ability and in mechanical strength. This membrane is very suitable for use in reverse osmosis.