| 摘要 |
PURPOSE:To obtain the titled ammonia-free polymer of excellent solubility, by mixing hydrated acrylamide polymer gel with an alkali, heat-treating the mixture to hydrolyze the polymer substantially completely, and drying the hydrolyzate. CONSTITUTION:Acrylamide is dissolved in water and polymerized in the presence of a catalyst such as a redox initiator. The produced polymer is ground. The produced small pieces of the hydrated acrylamide polymer gel are sprayed and mixed with an aqueous solution of an alkali (e.g., caustic soda), and the mixture is held at about 50-95 deg.C for a predetermined time until the hydrolysis is effected to a degree of hydrolysis which is 1.1-3 times the value (theoretical degree of hydrolysis) represented by the formula: (the number of moles of the alkali added)/(the number of moles of the amide groups before hydrolysis)X100. The product is then dried to obtain a partially hydrolyzed acrylamide polymer. |
