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Abstract

Finely divided, cationic, aqueous polymer dispersions, method for the production thereof, and the use thereof The present invention relates to a finely divided, cationic, aqueous polymer dispersion which is obtainable by emulsion polymerisation of ethylenically unsaturated monomers in a continuous phase containing an aqueous liquid in which the emulsion polymerisation is carried out, in the presence of polymerisation initiators, of a combination of monomers comprising (a) from 0 to less than 60% by weight of at least one optionally substituted styrene, (b) from greater than 0 to 80% of at least one C₁-C₁₂-alkyl acrylate and/or at least one C₁-C₁₂-alkyl methacrylate, (c) from 0 to 10% by weight of at least one ethylenically unsaturated monomer comprising at least one acid group, (d) from 5 to 20% by weight of at least one ethylenically unsaturated monomer comprising a cationic group, and (e) from 0 to 50% by weight of at least one non-ionic ethylenically unsaturated monomer differing from (a), (b), (c), and (d), the sum of (a)+(b)+(c)+(d)+(e) being 100% by weight, and the aqueous liquid contains from 0 to 4% by weight based on the weight of the combination of monomers of at least one emulsifier, in which the emulsion polymerisation is carried out optionally in the presence of at least one terpene containing compound. Also claimed is a process or preparing the finely divided, cationic, aqueous polymer dispersion and the use of the finely divided, cationic, aqueous polymer dispersion for sizing paper, board and cardboard.

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First Claim