is characteristic of this type of microparticulate retention systems they show a poor capture of fillers and colloidal matter since no reduction in turbidity is observed the combination with bentonite does not significantly improve the effectiveness in terms of retention and only slightly improves the effectiveness in terms of drainage as for the linear polymer its behavior follows the tendency to improve the retention of fillers and fines the combination according to the invention of a branched polymer in reverse phase emulsion and bentonite provides a net gain in filler retention and in total retention and is revealed to be superior to the known linear polymer bentonite system the coagulation capacity is better for a branched polymer in emulsion which translates into an excellent reduction in the turbidity at 30 u2032 30 min the r 52 test and the r 102 test show that the invention makes it possible to obtain branched products having ul viscosities higher than those accessible through gel polymerization as described in european patient 0 574 335 any attempt to reach such highly advantageous ul viscosity values using a gel polymerization process with drying into a powder would result in a product that was totally insoluble and therefore totally unusable in the industry the sd 102 test shows that the polymer used in the form of a solution in water of the powder obtained by drying the.