Alkyldiketene-containing aqueous polymer dispersions which are obtainable
by miniemulsion polymerization of hydrophobic monoethylenically
unsaturated monomers in the presence of alkyldiketenes, processes for the
preparation of such polymer dispersions and the use of the thus
obtainable dispersions as sizes for paper or as water repellents for
leather, natural and/or manmade fibers and textiles.