Patent ID: 6617387
Filing Date: 2003-09-09
Classification: C04B,C08F

Abstract:
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 &agr;,&bgr;-ethylenically unsaturated mono-carboxylic acid or &agr;,&bgr;-ethylenically unsaturated dicarboxylic acid.