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Akzo Nobel Chemicals International B.v.

Akzo Nobel N.v.

Paul Emmenegger

Thomas Aberle

Robert Koelliker

Franck Vallée

Dominique Schaub

(Andrei) Andrey P Pustovgar

Andrei P Pustovgar

The present invention relates to the use of a solid comprising at least one organosilane and a carrier material to hydrophobise mortars, wherein the organosilane has the formula RSi(OR')or RRSi(OR&#x2032;)wherein Rand Rare the same or different and are a linear or branched C- to C-alkyl and/or alkenyl group, OR&#x2032; is an acetoxy, a C- to C-alkoxy and/or a C- to C-methoxyalkoxy and/or ethoxyalkoxy group, and the carrier material is a solid at room temperature. The amount of cement in the final formulation is zero or less than 5 wt.-%, based on the total weight of the final formulation in the dry and uncured form. Claimed are also a powder comprising the silane and a carrier with the carrier being a water-soluble polymer, dry mortar formulations containing no or less than 5 wt.-% cement, based on the dry weight of the uncured mortar formulation, as well as processes to manufacture the formulations and/or compounds.

Powder to hydrophobise and its use

The present invention provides a process to hydrophobize a mortar which is essentially free of cement, 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&#xb0; C., the curing step is performed at a temperature that is not lower than the softening point of the component minus 20&#xb0; C. and when the softening point of the component is 60&#xb0; C. or lower, the curing step is performed at 40&#xb0; 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&#xb0; 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&#xb0; C. and 20 rpm. The invention also covers an additive as well as a pasty and a dry mortar composition.

Process to hydrophobize cement-free mortars

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Oberkirch, Switzerland

Paul Emmenegger