Fine-dispersed, containing starch dispersion of polymers, a method for their production and their application as a means of sizing in the manufacture of paper

摘要

1. A finely dispersed starch-containing polymer dispersion obtained by radical-initiated emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, characterized in that (a) 30 to 60 weight are used as ethylenically unsaturated monomers .%, at least one optionally substituted styrene, (b) 1 to 60 wt.%, at least one CC-alkyl ester of acrylic and / or methacrylic acid, (c) 0 to 10 wt.% at least at least one further ethylenically unsaturated, capable of copolymerization of the monomer, and (st) - 15 to 40 wt.%, at least one split starch with a molecular weight of from 1000 to 65000 g / mol, and the sum of (a ) + (b) + (c) + (d) is 100% and refers to the total solids content, and the polymerization is carried out in the presence of at least 0.01 wt.%, in terms of the monomers used, at least at least one terpene-containing polymerization regulator. 2. A finely dispersed starch-containing polymer dispersion according to claim 1, characterized in that (a) 30 to 60 wt.% Of at least one optionally substituted styrene is used as ethylene unsaturated monomers, (b) 1 to 29 wt. % of at least one CC-alkyl ester of acrylic and / or methacrylic acid, (c) 0.1 to 5 wt.%, of at least one further ethylenically unsaturated copolymerizable monomer, and as starch, (g) 25 to 35 wt.%, at least one split starch with a molecular weight m Mot 1000 to 65000 g / mol, and the sum (a) + (b) + (c) + (d) is