| abstract |
Aqueous dispersions of polymers which are obtainable by free-radical suspension polymerization of ethylenically unsaturated monomers in an oil-in-water emulsion whose disperse phase contains at least one fluorescent dye dissolved in at least one ethylenically unsaturated monomer and has an average particle diameter of at least 1 μm, in Present at least one surface-active compound and at least 0.5 wt .-%, based on the monomers, of at least one hydrophobic, nichtpolymerisierbaren, organic compound, a hydrophobic polymer of at least one C 2 to C 6 olefin having a molecular weight M w up to 10,000, of a siloxane with a molecular weight M w up to 5,000 and / or polystyrene with a molecular weight M w up to 10,000, process for the preparation of these dispersions and use of these aqueous dispersions, as well as from these polymer dispersions each available by drying at least a fluorescent dye ff containing powders for marking materials. |