Wacker Chemie Ag

Manfred Hoelzl

Torsten Gottschalk-Gaudig

Peter Ball

Konrad Alfons Wierer

Juergen Pfeiffer

Christoph Briehn

Robert Maurer

Jürgen Pfeiffer

Frauke Kirschbaum

Martina Baumann

The object of the invention is porous membranes (M) comprising organopolysiloxane/polyurea/polyurethane/polyamide/polyoxalyl diamine copolymers of the general formula (1), where R, X, Y, D, E, F, B, B', m, n, a, b, c and d have the meanings indicated in claim, with the proviso that at least 10% of the Rgroups present in structural elements E, F and bound to nitrogen indicate hydrogen, and a method for the production of the membranes (M) and use thereof for separating material mixtures. 

Porous membranes made up of organopolysiloxane copolymers

Thin porous moldings of silicone copolymers, suitable for use as membranes in separation processes, are prepared by forming a solution or suspension of silicone copolymer in two solvents L1 and L2, casting the suspension or solution, and removing solvent L1 to form a silicone copolymer rich phase A, effecting structure formation, and then removing solvent L2 and residues of solvent L2 to form a thin porous molding.

Method for producing porous silicon molded bodies

Solid particles bearing zwitterionic functional groups exhibit properties unlike other functionalized particles, and are particularly useful as proton-conductive fillers in membranes for fuel cells, where they increase physical properties as well as charge conducting properties. The particles are prepared by reacting functionalized particles with zwitterionic group-containing silanes or siloxanes.

Particles comprising zwitterionic structural elements

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Burghausen, Germany

Manfred Hoelzl