To be, both sexes and the water polymer dispersion liquid of the particulate which is obtained both sexes and the water

摘要

The fine particles obtained by two-step polymerization, amphoteric, an aqueous polymer dispersion, in the first polymerization step at that time, Having an amino group is quaternized amino group and / or a free amino group, protonated (a) each of at least one (meth) acrylic acid ester and / or (meth) acrylamide 15 to 40 wt% Substituted styrene and (b) at least one or unsubstituted 40 to 70 wt% Methacrylonitrile and / or 0 to 25% by weight (c) and acrylonitrile At least one (e) and 0.5 to 5% by weight ethylenically unsaturated monomer having an acid group, at least one (d), nonionic (b) and different from (c), ethylenically unsaturated monomer 0 30 mass% It consists, in the solution polymerization, the sum of (a) + (b) + (c) + (d) + (e) from miscible in part with water, the prepolymer consisting of a monomer mixture comprising 100 wt% was prepared in a solvent to mix fully, mixed with water is subsequently solution / dispersion of the prepolymer in an aqueous solution of the prepolymer, non-ionic one, ethylenically unsaturated, at least in the second polymerization step still I want to emulsion polymerization of a monomer. The present invention relates to the use of polymer dispersions as a sizing agent for paper cardboard, and paper and the production of the polymer dispersions of the two-stage polymerization.