Process for the preparation of aqueous dispersions of copolymers from hydrophilic and hydrophobic monomers and copolymers obtainable therefrom and their uses

摘要

A process for the preparation of aqueous copolymer dispersions by free-radical polymerization of ethylenically unsaturated monomers in aqueous solution is described, in which DOLLAR A (a) 10 to 90% by weight of at least one hydrophilic monomer A which has an N-vinyl group and its rate of polymerization at pH -Values has a maximum above 7, and DOLLAR A (b) 10 to 90% by weight of at least one monoethylenically unsaturated hydrophobic monomer B, the polymerization rate of which has a maximum at pH values below 7, DOLLAR A in the presence of a radical starter system be copolymerized in such a way that the pH value decreases by 2 to 5 pH value units in the course of the polymerization. DOLLAR A The copolymer dispersions prepared in this way and the copolymers obtainable therefrom are suitable as auxiliaries for pharmaceutical, cosmetic or agrochemical preparations and for the production of paints and coatings, as well as glues and adhesives.