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:
Jan. 04, 2005
Filed:
Nov. 02, 2001
Masahiko Hirose, Ibaraki, JP;
Masahiko Hirose, Ibaraki, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
The present invention provides a composite reverse osmosis membrane as a polyamide membrane including a side chain amino group such as a residue of a polyvinyl alcohol-based amine compound represented by Formula 1. Such a membrane can remove organic impurities under a low pressure, providing an economical method for removal of impurities. An aqueous solution including a polyvinyl alcohol-based amine compound having a side chain amino group represented by Formula 1 is applied on a polysulfone-based ultrafiltration membrane as a microporous support. Next, trimesic acid chloride solution is applied causing interfacial polycondensation, which generates a reverse osmosis membrane. When this composite reverse osmosis membrane is evaluated by using a pH 6.5 aqueous solution including 500 mg/l of sodium chloride at an operation pressure of 5 kg/cmand at a temperature of 25° C., the permeable flux is at least 1.5 m/m·d, and the salt rejection is 80% or less.wherein 0<a, 0≦b, 2<c, 1≦x≦5, 0≦y≦4; Ris at least one group selected from the group consisting of an ether group, an alkylene group and an ester group; and Ris at least one group selected from the group consisting of an alkyl group and a halogen group.