Shaped articles which are composed of a copolymer containing fluorine groups and which are selectively permeable to liquids and gases and are simultaneously oleophobic and oleophilic

US4557955A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Axel Walch · Baldham, DE
• Walter Seifried · Wiesbaden, DE
• Wolfgang Michel · Altötting, DE
• Jurgen Kuhls · Burghausen, DE
• Jurgen Wildhardt · Wallrabenstein, DE

Key dates

• Filing date: Jul 27, 1982
• Grant date: Dec 10, 1985
• Expiry date: Jul 27, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1376
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to films and tubular structures which are selectively permeable to liquids and gases which are based on a copolymer composed of a copolymerized fluorinated olefin, copolymerized vinyl acetate and, optionally, a copolymerized olefin. It is possible for the acetate groups of the copolymer to have been saponified to form OH groups. The films or tubular structures have in each case an inherent, latent capacity for modifying their structure and are at the same time oleophobic and oleophilic. The invention also embraces processes for the preparation of the shaped articles described and processes for modifying their structure. The invention also relates to the use of shaped articles according to the invention.