and maintained at this temperature with agitation for 1 to 2 hours while purging with nitrogen until the cal has been thoroughly coated with the surfactant at this point a premixed charge of 376 g of ioa and 24 g of aa to which has been added 2 g of vazo u2122 64 initiator 0 28 g of abp and 0 29 g of iotg with mixing until solution has been completed the resulting solution with initiator and chain transfer agent is then added to the initial aqueous mixture while vigorous agitation 700 rpm is maintained to obtain a good suspension the reaction is continued with nitrogen purging for at least 10 hours during which time it is monitored to prevent an exothermic reaction taking the reaction temperature above 70 u00b0 c at this point 30 9 g of 28 301 ammonium hydroxide is added followed by 4 12 g of zinc acetate the reaction is continued with heating to 55 u00b0 c and maintaining nitrogen purge and agitation for 2 hours the psa beads are then collected by using a buchner funnel and several washings of deionized water the resulting filtration product also contained about 15 to 30 of water and was stable for storage transportation and handling for further processing the beads polymerized by this suspension technique were dried the dried beads were extruded in solid form.