Modification of the flow resistance of diaphragms

US5919348A · kind A · utility

Assignee

• BASF SE

Inventors

• Holger Friedrich · Frankenthal (Pfalz), DE
• Klaus-Dieter Hoppe · Monsheim, DE
• Bernd Leutner · Bischofswerda, DE
• Dieter Schlafer · Ludwigshafen, DE
• Kurt Hecky · Zeiskam, DE

Key dates

• Filing date: Dec 2, 1997
• Grant date: Jul 6, 1999
• Expiry date: Dec 2, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25B15/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The flow resistance of a diaphragm based on a fiber material is modified by treating the diaphragm during or after preparation thereof with a dispersion comprising a fluorine-containing component and optionally with a solution comprising a precursor of ZrO.sub.2.