Patent ID: 7959011

Claim:
A process for producing a membrane, comprising providing a polymeric nonwoven with a ceramic coating in and on said nonwoven by applying a suspension onto and into said polymeric nonwoven and solidifying the suspension to form a ceramic coating on and in said nonwoven by heating one or more times, wherein said suspension comprises a sol and at least one fraction of oxidic particles selected from the group consisting of oxides of the elements Al, Zr, Ti and Si, and at least two different adhesion promoters which are each based on an alkylalkoxysilane of the general formula I R x —Si(OR) 4-x (I) where x=1 or 2 and R=organic radical, the R radicals being the same or different, wherein both of the adhesion promoters comprise alkyl radicals which at least each comprises a reactive group as a substituent, said reactive group on said alkyl radical of one adhesion promoter reacting with said reactive group of the other adhesion promoter; said at least one adhesive promoter has a reactive groups which is capable of reacting under the action of UV light; after the applying, exposing the polymeric nonwoven to UV radiation to form a covalent bond between the different adhesion promoters to form the ceramic coating, wherein the ceramic coating comprises a silicon network bonded (i) via oxygen atoms to said oxides of said ceramic coating, (ii) via organic radicals to said polymeric nonwoven and (iii) via at least one carbon chain to a further silicon atom.