| abstract |
Process for the continuous production of crosslinked, finely divided, gel-like polymers by copolymerizing DOLLAR A a) water-soluble, monoethylenically unsaturated monomers, DOLLAR A b) 0.001 to 5 mol%, based on the monomers (a), of at least two monomers containing ethylenically unsaturated double bonds and DOLLAR A c) 0 to 20 mol%, based on the monomers (a), of water-insoluble monoethylenically unsaturated monomers DOLLAR A in 20 to 80% by weight aqueous solution in the presence of initiator at temperatures from 0 to 140 ° C., wherein the aqueous solution of the monomers together with the initiator and an inert gas is continuously fed to a mixing kneader with at least two axially parallel rotating shafts, with several kneading and transport elements on the shafts, which promote the materials added at the beginning of the mixing kneader in the axial direction effect at the end of the mixer, characterized in that the proportion the heat removal by evaporation of water from the reaction mixture is at least 5% of the heat of reaction and the proportion of heat removal by product discharge is at least 25% of the heat of reaction and the remaining heat is removed by cooling the reactor walls. |