| abstract |
The invention consists in the use, as thickening agent of an aqueous formulation in particular rich in salts, of a water-soluble or alkali-soluble copolymer consisting of (by weight): a) 30% to 45% of acid (meth )acrylic, b) 50% to 60% acrylamide and/or N-methylol and/or an acrylic ester, c) 2% to 10% of a hydrophobic monomer of formula R1 - (R2O)m - R3, where: - R1 denotes a polymerizable unsaturated function, - R2O denotes an alkylene oxide group having from 1 to 6 carbon atoms, - m is an integer between 20 and 50, - R3 denotes a linear alkyl chain comprising at least 16 and at most 26 carbon atoms, d) 0.1% to 4% of at least one crosslinking agent which is preferably ethyleneglycoldimethacrylate (EDMA). |