Use of ammonia - free polymer dispersions as an additive in building materials based on a hydraulic binder

摘要

The subject matter of the present invention is the use of ammonia - free polymer dispersions, containing at least one copolymer, of the suitable monomers of dollars a a) 40 to 80 w -% of at least one ester of acrylic acid with c φ 2 φ - c φ 12 φ - alkanols, dollars a b) 10 to 40 w -% of at least one vinyl aromatic monomer and / or at least one ester of methacrylic acid with c φ 1 φ - c φ 4 φ - alkanols, dollars a is c) 2 to 15 w -% of at least a monoester of a c φ 2 φ - c φ 10 φ - alkanediol with acrylic acid or methacrylic acid, dollar a d) at most 1 w -% ethylenically unsaturated monomers, the at least one acid group, or their salts, dollars a e) is less than 5 w -% alpha, beta - ethylenically unsaturated nitriles and dollars a f) is less than 1 w -% amides, alpha, beta - of ethylenically unsaturated mono - and dicarboxylic acids of dollars a as copolymerized units, as well as of the polymer dispersion available polymer powder or - granules, as an additive to building materials based on a hydraulic binder. Also a subject, the building materials based on a hydraulic binder and binder preparations containing these polymers contain, as well as a method for improving the mechanical strength, elasticity, and processability of building materials based on a hydraulic binder.