| abstract |
method for preparing a water-soluble structured polymer, and, use of polymers. this invention relates to a method for preparing a water-soluble structured polymer having a weight average molecular weight greater than 1 million daltons and a huggins coefficient kh greater than 0.4, the method comprising the following successive steps: a ) to prepare a polymer, in the form of a gel, by deposition of free radical polymerization in aqueous solution at an initiation temperature between -20 °c and + 50 °C of at least one water-soluble monounsaturated ethylenic monomer, the total weight concentration of monomer(s) in relation to the polymerization charge being between 10 and 60%; b) granulating the resulting polymer gel; c) drying the polymer gel to obtain a polymer in powder form; d) grinding and sieving the powder; at least 10% by weight of water-soluble polymer, based on the total weight of the water-soluble monounsaturated ethylene monomer or monounsaturated ethylenic monomers used in step a), being added during polymerization step a) and, optionally, during step granulation b), the water-soluble polymer being structured and added as an inverse water-in-oil emulsion or dispersion in oil. |