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:
Nov. 12, 1991
Filed:
Jun. 09, 1989
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
A selectively ion-adsorptive, porous membrane comprising a membranous, porous resin matrix of a hydrophobic polyolefin or a hydrophobic copolymer of an olefin and a halogenated olefin and a plurality of side chains chemically bonded to both surfaces, which in turn are inclusive of pore wall surfaces, of the membranous porous resin matrix is disclosed. The side chains collectively contain both neutral hydroxyl groups and ion exchange groups. The selectively ion-adsorptive, porous membrane is suitable for use in selective purification or selective removal of desired ionic substances including not only ionic inorganic substances but also an ionic organic substances, such as a protein and an amino acid, on a commercial scale. Further, the selectively ion-adsorptive, porous membrane has not only excellent heat resistance, but also excellent mechanical strength. Therefore, the porous membrane of the present invention can advantageously be used for industrial applications, such as pharmacy, fermentation and the like.