Ammonia-free polymer dispersions as additives in mineral building materials based on hydraulic binders

A building material, comprising:

• a hydraulic binder;
• from 0.5 to 150% by weight of at least one copolymer based on a dry weight of a mineral fraction of said building material;
• from 0.2 to 10% by weight of a mixture of 1) at least one nonionic alkoxylated emulsifier and 2) at least one anionic alkoxylated emulsifier, based on the amount of said copolymer;
• wherein said copolymer is in a form selected from the group consisting of an ammonia-free aqueous polymer dispersion, polymeric granules, polymeric powder and mixtures thereof;
• wherein said polymeric granules and said polymeric powder are obtained from said ammonia-free aqueous polymer dispersion by removing at least 80% by weight of the volatile components from said ammonia-free aqueous polymer dispersion;
• wherein said copolymer comprises as polymerized monomers:
• a) from 40 to 80% by weight of at least one ester of acrylic acid with a C2-C12-alkanol,
• b) from 10 to 40% by weight of i) at least one vinylaromatic monomer, ii) at least one ester of methacrylic acid with C1-C4-alkanols or iii) mixtures of i) and ii),
• c) from 2 to 15% by weight of at least one monoester of a C2-C10-alkanediol with acrylic acid or methacrylic acid,
• d) not more than 1.0% by weight of an ethylenically unsaturated monomer which has at least one acid group, or a salt thereof,
• e) less than 5% by weight of an ethylenically unsaturated nitrile and
• f) less than 1% by weight of an amide of a α,β-ethylenically unsaturated mono-carboxylic acid or α,β-ethylenically unsaturated dicarboxylic acid;
• wherein said copolymer is free of primary amido groups and nitrile groups.