Patent ID: 8703874

Claim:
A process to hydrophobise a mortar formulation, the process comprising: mixing a solid with the mortar formulation, the solid comprising at least one organosilane and a carrier material, wherein a) the organosilane has the formula R 1 Si(OR′) 3 (I) or R 1 R 2 Si(OR′) 2 (II) wherein R 1 and R 2 are the same or different and are a linear or branched C 1 - to C 4 -alkyl and/or alkenyl group, OR′ is an acetoxy, a C 1 - to C 4 -alkoxy and/or a C 2 - to C 6 -methoxyalkoxy and/or ethoxyalkoxy group, and b) the carrier material is solid at room temperature, and wherein the weight ratio of the organosilane to the carrier material is between 70:30 and 1:99; the solid is in the form of a powder, a granulate and/or a flake; and the amount of cement in the final mortar formulation is zero or less than 5 wt.-%, based on the total weight of the final mortar formulation in the dry and uncured form.