abstract |
A water-soluble, hydrophobically associating copolymer comprising a monoethylenically unsaturated, water-soluble, surface-active monomer (a) and a monoethylenically unsaturated, hydrophilic monomer (b) other than monomer (a). The copolymer is made in the presence of a nonpolymerizable surfactant and has pronounced thickening properties in aqueous systems. |