Hydrophobizing agent for mineral materials

A process for producing a hydrophobizing agent comprising

• i) a polyion complex comprising at least one polycation (i.1) and at least one polyanion (i.2), where the molar ratio of polycation:polyanion in the polyion complex is ≥1;
• ii) a silicone compound composition;
• and
• iii) a carrier composition which comprises at least one carrier selected from the group consisting of amorphous silicon dioxide, amorphous agglomerated silicon dioxide, quartz powder, limestone powder, aluminum oxide, illite, iron oxide and mixtures of two or more of these carriers;
• wherein the process comprises the steps:
• a) providing an aqueous solution of the polyion complex (i);
• b) providing the carrier composition (iii);
• c) mixing the aqueous solution of the polyion complex (i) with the carrier composition (iii) to give a first mixture;
• and
• d) adding the silicone compound composition (ii) which optionally contains a surfactant composition and/or a UV dye composition to the first mixture obtained in (c) to give a coated pulverulent carrier composition of the hydrophobizing agent;
• wherein the polycations (i.1) of the polyion complex (i) are present as cation part of poly-N,N-disubstituted-3,4-dimethylenepyrrolidinium chloride salts of the general formula (I):
• wherein
• R1 and R2 are selected independently from the group consisting of a hydrogen atom, a C1-C18-alkyl radical and a benzyl radical;
• and
• x is the degree of polymerization;
• wherein the silicone compound composition (ii) comprises at least one silicone compound (ii.1) which is selected from the group consisting of monoorgano-C1-C20-trialkoxysilane, diorgano-C1-C20-dialkoxysilane, poly(organo-C1-C20-alkoxysiloxane) and mixtures of two or more of these silicone compounds.