1
Heinz Joachim Muller, Heinz Dieter Sluma, Gunter Eberhard, Ernst Spindler, Lothar Krauss, Helmut Volker: Flat or capillary membrane based on a homogeneous mixture of polyvinylidene fluoride and a second polymer which can be rendered hydrophilic by chemical reaction. AKZO, Oliff & Berridge, November 19, 1991: US05066401 (92 worldwide citation)

Membranes are based on a homogeneous mixture of polyvinylidene fluoride and a second polymer which can be rendered hydrophilic by chemical reaction. The membranes contain 70 to 98 percent by weight of polyvinylidene fluoride and 2 to 30 percent by weight of a polymer formed essentially from polymeth ...


2
Heinz Dieter Sluma, Jurgen Passlack, Brigitte Buttner, Marion Scherf: Synthetic hydrophilic membranes and method for their manufacture. Akzo, Oliff & Berridge, September 21, 1993: US05246582 (25 worldwide citation)

A synthetic hydrophilic membrane, and method for manufacturing thereof, in the form of hollow fibers or flat membranes for dialysis and/or ultrafiltration, containing a mixture of polysulfone and sulfonated polysulfone, the mixture containing 65 to 95 wt.% sulfonated polysulfone, possibly as a salt ...


3
Heinz Dieter Sluma, Robert Weizenhofer, Alfons Leeb, Karl Bauer: Method of making a multilayer capillary membrane. AKZO, Oliff & Berridge, September 7, 1993: US05242636 (20 worldwide citation)

A multilayer membrane for separating gas mixtures includes a polymer supporting membrane with a voids volume of more than 50% and a coating of two or more separating layers made of two or more different polymers. A hollow capillary serving as the supporting membrane is guided through the central bor ...


4
Heinz Dieter Sluma, Dieter Huff: Method for sulfonating aromatic polyether sulfones. Akzo, Oliff & Berridge, May 7, 1991: US05013765 (15 worldwide citation)

The sulfonation of aromatic polyether sulfones in a controllable manner is possible by means of sulfur trioxide in concentrated sulfuric acid as solvent. By maintaining a sulfur trioxide content of less than 6 percent by weight, based on the solvent, and a reaction temperature of less than 30.degree ...


5
Walter Loffelmann, Jurgen Passlack, Harald Schmitt, Heinz Dieter Sluma, Michael Schmitt: Polysulfone membrane and method for its manufacture. Akzo Nobel, Oliff & Berridge, March 9, 1999: US05879554 (9 worldwide citation)

A synthetic membrane consisting of a mixture of polysulfone and sulfonated polysulfone and not more than 20 wt. % of other polymers, characterized in that the mixture contains 0.5 to 8 wt. % sulfonated polysulfone, possibly as the salt of sulfonic acid, and a method for manufacturing this synthetic ...


6
Heinz Dieter Sluma, Jurgen Passlack, Harald Schmitt, Walter Loffelmann, Karl Henke: Polyacrylonitrile membrane. Akzo, Oliff & Berridge, March 1, 1994: US05290448 (7 worldwide citation)

An asymmetric semipermeable membrane for dialysis and/or ultrafiltration is composed of a copolymer of acrylonitrile and acrylic ester and an ionic or ionizable monomer in the form of a hollow fiber. The copolymer is composed of 90.50 to 95.00 wt. % acrylonitrile, 4.99 to 8.60 wt. % acrylic ester, a ...


7
Heinz Dieter Sluma, Robert Weinzenhofer, Alfons Leeb, Karl Bauer: Gas separation membrane. Akzo, Oliff & Berridge, October 18, 1994: US05356461 (4 worldwide citation)

A multilayer membrane for separating gas mixtures includes a polymer supporting membrane with a voids volume of more than 50% and a coating of two or more separating layers made of two or more different polymers. A hollow capillary serving as the supporting membrane is guided through the central bor ...