| 摘要 |
Water-soluble polymers and copolymers are prepared by mixing a concentrated aqueous solution of an ethylenically unsaturated water-soluble monomer such as coylamide and a polymerization catalyst with an organic water-insoluble heat transfer medium such as benzene, toluene or xylene, and thereafter allowing the monomer to polymerize in the aqueous phase in the presence of a surface active compound which acts as an antisticking agent. In the preferred process an aqueous solution is prepared containing from 30 to 80% by weight acrylamide, 20 to 70% of water and 0-50% urea, based on total weight of solution and 0.003 to 0.2% based on weight of acrylamide of a polymerization catalyst such as potassium persulphate. The water solution is then added to it mixed with a water-insoluble, organic heat transfer medium which preferably is capable of forming an azeotropic mixture with water. The mixture should contain a minor amount of a surface-active agent which prevents the polymer from sticking to the agitator and the walls of the vessel.
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