Abstract
Effects of unsteady rate stirring mode on the particle size and the size distribution were thoroughly investigated in the preparation of cross-linked polystyrene and chloromethyl resins under suspension polymerization conditions. Thus, unsteady rate stirring at low rate (e.g. 200 rpm) generally gave both resins in smaller size and narrower distribution with comparison to the usual steady rate stirring under the same conditions other than the stirring mode. When the suspension polymerization was carried out without an organic solvent such as chlorobenzene for dilution of monomer phase, the aggregated primitive particles were often observed by microphotographs. Especially, unsteady mode at low rate can give monodispersed cross-linked resin beads.
