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. 09, 2014
Filed:
May. 03, 2007
Wolfgang Ansorge, Essen, DE;
Ernst Spindler, Kleinheubach, DE;
Richard Krüger, Wuppertal, DE;
Martin Rütering, Wuppertal, DE;
Oliver Schuster, Gevelsberg, DE;
Wolfgang Ansorge, Essen, DE;
Ernst Spindler, Kleinheubach, DE;
Richard Krüger, Wuppertal, DE;
Martin Rütering, Wuppertal, DE;
Oliver Schuster, Gevelsberg, DE;
Membrana GmbH, Wuppertal, DE;
Abstract
The invention relates to a hollow-fiber membrane for ultrafiltration made from a hydrophobic aromatic sulfone polymer and at least one hydrophilic polymer, the membrane having an open-pore separating layer on the lumen side, an adjoining supporting layer with asymmetric, sponge-like pore structure without finger pores and an outer layer adjoining the supporting layer towards the outer surface. The separating layer has a cutoff between 20 000 and 200 000 daltons, a thickness of max. 10% of the membrane thickness and an essentially isotropic pore structure. The size of the pores in the supporting layer initially increases up to a zone with maximum pore size, and then decreases towards the outer layer, and the outer layer exhibits a thickness of 10 to 30% of the wall thickness and an essentially isotropic pore structure. The mean size of the pores in the outer layer is larger than in the separating layer, but smaller than in the supporting layer. The wall thickness of the hollow-fiber membrane lies in the range from 100 to 450 μm. The invention relates furthermore to a method for the production of these hollow-fiber membranes.