| abstract |
Copolymers based on ethylenically unsaturated monomers and containing urethane groups, processes for their preparation and their use. n Copolymers prepared by free-radical-initiated copolymerization of ethylenically unsaturated copolymerizable monomers, in which the copolymers are preferably synthesized from n a) 25 to 85% by weight of ethylenically unsaturated hydrophobic monomers, and n b) 1 to 50% by weight of ethylenically unsaturated monomers capable of salt formation, and n c) 0.1 to 30% by weight of surface-active urethane derivatives containing ethylenically unsaturated carboxyl or carbamido radicals, and n d) 0 to 10% by weight of other ethylenically unsaturated monomers different from a) to c) and containing functional radicals, and n e) 0 to 5% by weight of ethylenically unsaturated carbonyl compounds, and n f) 0 to 5% by weight of ethylenically polyunsaturated or polyfunctional monomers capable of crosslinking, and n g) 0 to 5% by weight of molecular weight regulators, and, if aqueous dispersions or the copolymers isolated therefrom are present, these furthermore contain n h) 0.1 to 10% by weight, relative to the total amount of all monomer units in the copolymer, of emulsifiers and/or protective colloids, and, if desired, the copolymers are partially or completely neutralized and converted into water-soluble or colloid-water-dispersible copolymer salts and, if desired, are obtained in solid form. n Use of the products as viscosity-increasing and rheology-modifying thickener substances in aqueous systems. |