Abstract:

Microsuspension polymn. of vinyl chloride (I) catalyzed by diacetyl peroxydicarbonate in the presence of Shamtonate 333 (a petroleum sulfonate in hydrocarbon oil) and Berol 259 yielded spherical, smooth PVC particles of 1-3 $μ$ diam. The addn. of butylene glycol further improved the stability and particle size distribution in the microsuspension system. Polymn. of I with conventional emulsifying agents such as Na lauryl sulfate, ammonium laurate, Methocel K35, Aerosol AT, and Myrj 49 yielded aggregated PVC particles due to inversion of the emulsion to a water-in-oil system. Stable emulsions were obtained for CH2Cl2 (as model compd. for I) but not for I in the presence of nonionic emulsifiers alone. [on SciFinder(R)]