Patent ID: 8680181

Claim:
Process to hydrophobize a mortar which is essentially free of cement, the mortar comprising a hydraulically setting binder, a latent hydraulic binder, a non-hydraulic binder, an organic binder and/or a mineral filler, wherein the mortar contains no or up to 5 wt. % cement, wherein the cement is Portland cement in accordance with EN 197-1 CEM I, II, Ill, IV, and V, calcium phosphate cement and/or aluminous cement, the process comprising the steps of mixing the mortar with an additive and water and subsequently allowing the mortar to cure, wherein the additive contains a component which is a rosin, a rosin derivative, a mixture of a resin with a rosin, or a mixture of a resin with a rosin derivative, wherein when the softening point of the component is higher than 60° C., the curing step is performed at a temperature that is not lower than the softening point of the component minus 20° C. and when the softening point of the component is 60° C. or lower, the curing step is performed at 40° C. or lower, and wherein the rosin and/or rosin derivative have an acid number of at least 50 mg KOH/g, and when the component is a mixture of a resin with a rosin, or a mixture of a resin with a rosin derivative, the resin at 23° C. and pH 7 has a water solubility of about 5 g/l or less and a Brookfield viscosity of less than 20,000 mPas, measured at 23° C. and 20 rpm.