Patent ID: 8354165

Claim:
A coating material comprising: (a) first oxidic particles produced by hydrolytic condensation in a size range of 5-20 nm, wherein the first particles have pores with a maximum of a pore diameter distribution of below 6 nm, (b) second particles of a diameter in a size range of 80-300 nm, (c) a first water-containing solvent in which the starting material for the oxidic particles formed by hydrolytic condensation is soluble and which enables or enhances hydrolysis and condensation of the starting material, and (d) at least one second solvent, selected from the group consisting of alcohols, ethers, organic acids, esters, ketones, amines, and add amides, of the formulas ROH, ROR 1 , RCOOH, RCOOR 1 , RC(O)R 1 , RCONR 2 2 , and mixtures thereof, wherein R and R 1 are optionally the same or different and have the meaning of unsubstituted or hydroxyl, —NHR 2 , amido, imino, —COOR 2 , and/or alkoxycarbonyl substituted, saturated or unsaturated, straight-chain or branched alkyl, alkoxy or polyether alkoxy; or wherein R and R 1 are linked with one another by forming a ring with formation of an unsubstituted or hydroxy, —NHR 2 , amido, imino, —COOR 2 , and/or alkoxycarbonyl substituted or unsaturated, straight-chain or branched alkylene, oxyalkylene or alkylene (poly)oxyalkylene group; with the proviso that R is not an unsubstituted alkyl when the solvent is of the formula ROH, and wherein R 2 optionally may be the same or different and is H or C 1 to C 6 alkyl.