Polymer having a betaine structure, solution diffusion membrane, process for producing same and use thereof

US5164424A · kind A · utility

Assignee

• Deutsche Carbone AG · DE

Inventors

• Hartmut E. A. Brueschke · Schallstadt, DE
• Guenter F. Tuesel · Bad Homburg vor der Höhe, DE
• Guido Ellinghorst · Overath, DE
• Axel Niemoeller · Meißen, DE

Key dates

• Filing date: Mar 25, 1991
• Grant date: Nov 17, 1992
• Expiry date: Mar 25, 2011

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2323/38
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A polymer is disclosed which has a betaine structure on at least one side chain. The polymer according to this invention is suitable for use as a material for producing a pervaporation membrane. A process is described for producing the polymer according to this invention whereby betaine groups are introduced into a starting polymer. The betaine groups are introduced into the starting polymer by irradiation of the starting polymer with ionizing radiation and then treatment of the irradiated starting polymer with monomers that are capable of a graft reaction. Monomers that either already contain a betaine function or are capable of forming such a function are used. The betaine can be formed, e.g., by alkylating quaternation of a nitrogen atom present in the monomer if an acid group is introduced simultaneously with the alkylating agent.