Process of coating a mineral molding with an aqueous preparation comprising, as film-forming constituent, at least one polymer P

A method of coating a mineral molding, comprising applying at least one aqueous preparation to at least one surface of the molding, said aqueous preparation comprising:

• (i) as film-forming constituent at least one polymer P which is composed of ethylenically unsaturated monomers M and which is present in dispersed form in the aqueous phase of the aqueous preparation and which has a glass transition temperature TG in the range from −25 to +80° C.;
• (ii) at least one anionic emulsifier selected from the group consisting of (a), (b), and (c):
• (a) salts of formula I:
• Alk−{O—Et}n—OSO2O−M+ (I)
• wherein
• Alk is linear or branched, saturated alkyl having from 10 to 18 carbon atoms,
• Et is 1,2-ethylene,
• n is an integer from 25 to 40, and
• M+ is a monovalent cation or a cation equivalent,
• (b) mixtures of salts of formula I;
• and
• (c) mixtures of salts of formula I with other anionic emulsifiers, wherein the salts of formula I make up at least 80% by weight of the anionic emulsifiers;
• and
• (iii) at least one nonionic emulsifier;
• wherein the weight ratio of said anionic emulsifier (ii) to said nonionic emulsifier (iii) ranges from 5:1 to 1:2;
• wherein said aqueous preparation consists of, based on its total weight:
• 10 to 60% by weight of said at least one polymer P;
• 0.5 to 3% by weight of said at least one anionic emulsifier (ii), based on the weight of the polymer P;
• 0.1 to 6% by weight of said at least one nonionic emulsifier (iii), based on the weight of the polymer P;
• 0.1 to 30% by weight of conventional auxiliaries selected from the group consisting of wetting agents, fungicides, antifoams, thickeners, antifreezes, flow promoters, plasticizers and film-forming auxiliaries;
• 0 to 60% by weight of pigments and/or fillers;
• and
• water to 100% by weight;
• and wherein the monomers M comprise as the only monomers:
• (i) from 90 to 99.9% by weight of one monomer MI, selected from the group consisting of vinylaromatic monomers, esters of monoethylenically unsaturated C3-C8 monocarboxylic acids and C1-C12 alkanols, and vinyl esters of aliphatic C1-C18 monocarboxylic acids, and
• (ii) from 0.2 to 10% by weight of at least one monomer MW, selected from the group consisting of monoethylenically unsaturated C3-C8 monocarboxylic acids, monoethylenically unsaturated C4-C8 dicarboxylic acids, amides of monoethylenically unsaturated C3-C8 monocarboxylic acids and hydroxyalkyl esters of monoethylenically unsaturated C3-C8 monocarboxylic acids.