| abstract |
The invention consists in the use, as thickening agent of a aqueous formulation, particularly rich in salts, of a water-soluble or alkali-soluble copolymer consisting of (by weight) a) 30% at 45% (meth) acrylic acid, b) 50% to 60% acrylamide and / or N-methylol and / or acrylic ester, c) 2% to 10% a hydrophobic monomer of formula R1 - (R20) m R3, OR - R1 denotes a polymerizable unsaturated functional group, R20 denotes a alkylene oxide group having 1 to 6 carbon atoms carbon, m is an integer between 20 and 50, - R3 denotes a chain linear alkyl having at least 16 and not more than 26 carbon atoms, d) 0.1% to 4% of at least one crosslinking agent which is preferentially leneglycoldimethacrylate (EDMA) |