| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for allowing the viscosity of a polymerization suspension to be kept at a low level while coagulating polymer fine particles in a polymerization system, in aqueous suspension polymerization of an acrylonitrile copolymer. Ž<P>SOLUTION: In the method for producing the acrylonitrile copolymer, a monomer composition containing acrylonitrile, a sulfite as a reducing agent, a persulfate as an oxidizing agent, and ammonium sulfate are continuously supplied into the system and subjected to aqueous suspension polymerization, and the acrylonitrile copolymer is continuously discharged to the outside of the system, wherein formula (1) and (2) are satisfied, wherein formula (1) is 5.7≤Y/X≤9.2 and formula (2) is 0.7≤Y/(X+Z)≤3.7, and X, Y, and Z are respectively molarity of the persulfate ion originating from the oxidizing agent, molarity of the sulfite ion originating from the reducing agent, and molarity of the sulfate ion originating from ammonium sulfate. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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