Abstract: The present invention relates to a sheet material and filter element, where the sheet material and the filter element have a hydrophobic separating layer, and also to use thereof and to a process for production of same.

Abstract: The present invention relates to a sheet material and filter element, where the sheet material and the filter element have a hydrophobic separating layer, and also to use thereof and to a process for production of same.

Abstract: The present invention relates to a hydrophobic or oleophobic microporous polymer membrane having a structurally induced drip-off effect, to methods for producing the membrane according to the invention, to the use of the membrane in the sterile filtration of gaseous fluids, and to the use of the membrane as a liquid barrier in liquid-containing systems to be vented.

Abstract: The present invention relates to a hydrophobic or oleophobic microporous polymer membrane having a structurally induced drip-off effect, to methods for producing the membrane according to the invention, to the use of the membrane in the sterile filtration of gaseous fluids, and to the use of the membrane as a liquid barrier in liquid-containing systems to be vented.

Abstract: A process for cross-linking a cellulose hydrate membrane by use of a water-soluble diepoxide in an alkaline solution. The membrane so produced is highly resistant to attack by alkalis, acids and cellulases, and is readily regenerable by alkaline cleaning.

Abstract: There is disclosed a method for grafting unsaturated monomers to nitrogen-containing polymers in an aqueous environment and in the presence of carbon tetrachloride and certain reducing agents.

Abstract: Fabrication of the surface-grafted microporous membranes by coating the membrane with an N-halogenated compound, followed by grafting with an unsaturated monomer and sodium dithionite in a primarily aqueous solution that may contain an organic halogen compound selected from carbon tetrachloride and trichloroacetic acid. The coating may be formed in situ and may be cross-linked.

Abstract: The invention relates to a textile reinforced membrane filter wherein the membrane filter material and the textile reinforcing material are made from synthetic polymers of the same substance class. A method for the production of the textile reinforced membrane filters where the first contact time between the filter solution film and the textile reinforcement material is maintained between 0.1 and 15 seconds.

Abstract: Halogen-substitutable hydrogen atoms are linked to nitrogen atoms of a polymer, with ethylenically-unsaturated monomers. By using inorganic or organic hypohalogenites and/or organic N-halogen derivatives as halogenation means, hydrogen atoms on the nitrogen atoms of the polymer membranes or polymer formed materials are replaced by halogen atoms and part of these are removed by reducing agents in the presence of ethylenically unsaturated monomers, with radical grafting of these on to the nitrogen atoms, after which the remaining halogen atoms are removed by reducing agents in the absence of monomers.

Abstract: The invention relates to porous membrane filters, specifically mirco- and ultraporous membrane filters, which have fluid-impermeable areas as a result of a change of their structure on one side of the membrane to a film-like state (film-formation). These filters are, for example, very suitable for an assembly in filter cartridges according to the pouring method, because they still have on the side opposite to the filmed-up side a porous structure, which offers an ideal anchoring possibility for penetrating liquid resin.