Patent ID: 8062754

Claim:
A process for hydrophobizing and improving the beading effect of a porous construction material comprising applying a liquid silicone composition to a porous construction material, such that the liquid silicone composition is introduced into the porous construction material, wherein the liquid silicone composition consists of: a) at least one polyorganosiloxane resin A exhibiting, per molecule, on the one hand, at least two different siloxyl units chosen from those of M, D, T and Q type, one of the units being a T unit or a Q unit, and, on the other hand, at least three hydrolyzable/condensable groups of OH and/or OR 1 type where R 1 is a linear or branched C 1 to C 6 alkyl radical; b) at least one metal alkoxide B in a content ≧5% by weight with respect to the polyorganosiloxane resin A, said metal alkoxide having the general formula: M[(OCH 2 CH 2 ) a —OR 2 ] n (I) in which: M is a metal chosen from the group formed by: Ti, Zr, Ge, Mn and Al; n=valency of M; the R 2 substituents, which are identical or different, each represent a linear or branched C 1 to C 12 alkyl radical; a represents zero, 1 or 2; with the conditions according to which, when the symbol a represents zero, the R 2 alkyl radical has from 2 to 12 carbon atoms and, when the symbol a represents 1 or 2, the R 2 alkyl radical has from 1 to 4 carbon atoms; c) at least one crosslinking agent C, in a content ≧4% by weight with respect to the polyorganosiloxane resin A, said crosslinking agent C having the formula Si[(OCH 2 CH 2 ) a —OR] 4 (II) in which: the R substituents, which are identical or different, each represent a linear or branched C 1 to C 12 alkyl radical, and a represents zero, 1 or 2; and d) an organic solvent which can be used for the hydrophobizing of construction material.