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. 03, 2013
Filed:
Dec. 07, 2009
Quan Huang, Schwelm, DE;
Karl Bauer, Dammbach, DE;
Phung Duong, Essen, DE;
Oliver Schuster, Gevelsberg, DE;
Quan Huang, Schwelm, DE;
Karl Bauer, Dammbach, DE;
Phung Duong, Essen, DE;
Oliver Schuster, Gevelsberg, DE;
Membrana GmbH, Wuppertal, DE;
Abstract
The invention relates to a hydrophobic, integrally asymmetrical hollow-fiber membrane made of a vinylidene fluoride homopolymer or copolymer, wherein the wall of the membrane has a microporous supporting layer having a sponge-like, open-pored, essentially isotropic pore structure without finger pores, the supporting layer extending across at least 90% of the wall thickness and having pores with an average diameter of less than 0.5 μm. The hollow-fiber membrane is characterized in that it has a separating layer adjacent to the supporting layer on its outer surface and that it has an outer surface with a homogeneous, uniform structure without pores, a porosity in the range from 40 to 80 vol. %, a wall thickness from 25 to 100 μm, a diameter of the lumen of the hollow-fiber membrane from 100 to 500 μm, a permeability for nitrogen of at least 25 ml/(cm·min·bar), and an elongation at break of at least 250%. The invention further relates to a method for producing hollow-fiber membranes of this type.