Other

Frank Schönberger

Jochen Kerres

Thomas Häring

Martin Hein

Various blends and blend membranes from low-molecular hydroxymethylene-oligo-phosphonic acids R&#x2014;C(POH)(OH)and polymers, the group R representing any organic group, the polymers containing cation exchanger groups or their nonionic precursors of the type SOX, X being a halogen, OH, OMe, NRR, ORwith Me being any metal cation or ammonium cation, R, Rbeing H or any aryl- or alkyl group, PDX, COX and/or basic groups such as primary, secondary or tertiary amino groups, imidazole groups, pyridine groups, pyrazole groups etc. and/or OH groups. Such membranes may also include polymers that are modified with the 1-hydroxymethylene-1,1-bisphosphonic acid group. The polymers may be formed by reacting polymers which contain carboxylic acid groups or carboxylic halide groups &#x2014;COHal (Hal=F, Cl, Br, I) with phosphite compounds or by reacting polymeric aldehydes or polymeric keto compounds with phosphite esters while carrying out an amine catalysis, an oxidation of the intermediary hydroxyphosphonic acid with MnOor another oxidant.

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Saarlouis, Germany

Frank Schönberger