Abstract: Polymers, which have polyurethane and/or polyurea groups and contain finely divided fillers, are synthesized by reacting compounds, which contain at least two hydroxyl and/or amino groups, with at least difunctional isocyanates, optionally in the presence of catalysts, and mixing with suitable fillers. The compounds, containing hydroxyl and/or amino groups, and the isocyanates, are separately mixed intimately with finely divided solids so that flowable powders are obtained. The powders obtained are mixed in a stoichiometrically required amount, and the powder mixture is subjected to the action of shear forces at, if necessary, a higher temperature. The mixture of solids obtained has a shelf life of several days or weeks without reaction between the reactive compounds contained therein.

Abstract: A preparation for the water-repellant impregnation of porous, mineral building materials on the basis of organosilicon compounds is disclosed. The preparation is an emulsion containing alkoxy groups and consist of an emulsion containinga) 5 to 45% by weight of an alkoxysilane of the general formulaR.sup.1 --Si--(OR.sup.2).sub.3whereinR.sup.1 is an alkyl group with 1 to 16 carbon atoms and R.sup.2 is an alkyl group with 1 to 4 carbon atoms,b) 45 to 5% by weight of a mixture consisting ofb1) a silane of the general formula R.sup.3 --Si--(OR.sup.2).sub.3, wherein R.sub.3 is an aminoalkyl group with 1 to 6 carbon atoms or a group of the general formulaH.sub.2 N--(CH.sub.2).sub.x R.sup.4 --(CH.sub.2).sub.y --,in whichR.sup.4 represents oxygen, sulfur, --NH-- or --NH--CH.sub.2 --CH.sub.2 --NH group and x.gtoreq.2 and y.gtoreq., or a group of the general formula (R.sup.2 O).sub.3 Si--(CH.sub.2).sub.x --NH--(CH.sub.2).sub.x --, in which R.sup.