Cement compositions comprising redispersible polymer powders

A repair mortar, reinforcing mortar, tile adhesive, sealant, coating composition or filler containing a cement-based composition consisting essentially of, per 100 parts by weight of cement, from 5 to 500 parts by weight of a polymer formed from

• a) 30-99.5% by weight of at least one alkyl ester of (meth)acrylic acid,
• b) 0.5-10% by weight of at least one alkyl polyethoxy(meth)acrylate of formula 1:
• where R1 is a hydrogen atom or a methyl group, R2 is a C1 to C4 alkyl group and n is an integer from 1 to 55,
• c) 0-10% by weight of at least one ethylenically unsaturated mono- or dicarboxylic acid or anhydride, amide or hydroxyalkylamide thereof,
• d) 0-10% by weight of acrylonitrile or methacrylonitrile, and
• e) 0-50% by weight of further ethylenically unsaturated compounds selected from the group consisting of divinylbenzene, butanediol diacrylate, ethyldiglycol diacrylate, hexanediol diacrylate, ureidoethyl methacrylate, ureidoethyl methacrylamide, allyl methacrylate, 3-methacryloyloxypropyltrimethoxysilane, acetoacetoxyethyl methacrylate, diacetoneacrylamide, acrylamidoglycolic acid and methyl acrylamidoglycolate methyl ether.