| 摘要 |
PURPOSE:To obtain the title emulsion which is excellent in easiness of handling, etc., and is useful as, e.g., a chemical for petroleum recovery, by mixing a radical initiator with a specified aqueous solution of monomer mixture and an oil phase containing a hydrophobic solvent and an oil-soluble emulsifier and emulsion-polymerizing the obtained mixture. CONSTITUTION:A radical polymerization initiator (A) is mixed with 50-95pts.wt. aqueous solution (B) comprising 20-60pts.wt. monomer mixture of a composition of 0-59.5mol% acrylamide, 0.5-10mol% 2-acrylamido-2-methylpropanesulfonic acid, 40-99.5mol% N-methylolacrylamide and 0-10mol% acrylic acid and 80-40pts.wt. water and 50-5pts.wt. oil phase (C) comprising 70-98pts.wt. hydrophobic solvent and 30-2pts.wt. oil-soluble emulsifier and the obtained mixture is emulsion-polymerized. In this way, the title emulsion containing a water-soluble copolymer having structural units of formulas I, II, III and IV (wherein M is H or a monovalent alkali metal), having a water phase to oil phase weight ratio of 50-95/50-5 and a particle diameter in the aqueous phase, <=5mu. |
