Hernandez-Barajas, JoseWandrey, ChristineHunkeler, David2006-02-272006-02-272006-02-272002https://infoscience.epfl.ch/handle/20.500.14299/226571A process for prepg. a water sol. polymer comprises: providing a polymn. reaction mixt. comprising one or more polymerizable ethylenically unsatd. monomers; polymg. the ethylenically unsatd. monomers; and adding to the reaction mixt. during polymn. one or more chain branching agents (e.g., methylenebisacrylamide) either continuously or semi-continuously, the semi-continuous addn. further comprising at least two discrete addns. The polymers, typically acrylamide-based, have improved flocculating and dewatering properties. The polymer is useful in solid/liq. sepns. such as flocculants and coagulants in wastewater treatment applications, and as thickening agents. [on SciFinder (R)]patentUS6667374US6617402EP1335940US2002137858US2002132948AU7679200WO0232965US629462211003981