of nitrogen for 30 minutes there is introduced at 30 u00b0 c 184 mg of 70 cumene hydroperoxide and 313 mg of iron iii acetylacetonate dissolved at 5 ml of acetone after some minutes the temperature rises to 70 u00b0 c it is kept for one hour at this temperature and then the water is removed by azeotropic distillation when 480 g of water has been collected it is separated by filtration and dried for 30 minutes by pulsed air at 80 u00b0 c and then the product obtained is ground and sifted the viscosity of the 1 solution of this product is 3750 cp at 20 u00b0 c u03b7 gt 6 the measured cationicity is 2 meq g 96 of the theoretical cationicity the half decantation time for acheres muds with 8 g l containing 2 kg t of the product is 45 seconds a test is carried out under the same conditions with the same molar proportions of monomers replacing the cma by cmm namely 248 g of acrylamide and 181 g of cmm the viscosity at 20 u00b0 c of the 1 solution in water of the product obtained is 650 cp the measured cationicity is 1 3 meq g namely 64 of the theoretical cationicity the half decantation.