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. 19, 1988
Filed:
Dec. 10, 1982
Axel Walch, Frankfurt am Main, DE;
Juergen Wildhardt, Huenstetten, DE;
Dieter Beissel, Weisbaden, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Disclosed are asymmetrical macroporous membranes based on a synthetic polymer comprising a polymeric mixture of 5 to 70% by weight polyvinylpyrrolidone having a molecular weight .gtoreq.100,000 Dalton and 95 to 30% by weight of a polymer selected from a group consisting of a polysulfone, a polyether sulfone and an aromatic or araliphatic polyamide, each of the percentages by weight being relative to the total weight of the polymeric mixture. The membrane has a water absorbency of at least 11% by weight of water, relative to its total weight, at 100% relative humidity and 25.degree. C. Also disclosed is a process for preparation of the membranes.