PURPOSE: To obtain the titled solution containing fine particles of a specific polymerization initiator and no foam, having long-term stability, by subjecting a solvent to thin-film evaporation from an emulsion consisting of the organic solvent containing the specific polymerization initiator compound, water and a specified dispersion suspension.
CONSTITUTION: An organic solvent is subjected to thin-film evaporation from an emulsion consisting of the organic solvent dissolving an organic azo polymerization initiator compound, water and a dispersion suspension containing a carboxyvinyl polymer or its salt, to give a stable aqueous suspension containing the organic azo polymerization initiator compound as fine particles. The use of the dispersion suspension provides the aqueous suspension having dispersion stability of long period (≥one month), with supplying it with fluidity for easy liquid transportation. Since the desired solution contains no foam at all, it has neither inhibition of polymerization reaction nor hindrance of quantitativeness, so advantageously the process can be simplified.
TOOYAMA TAKANORI
OOBA HITOSHI
YAMAGUCHI OSAMU
Next Patent: ASYMMETRIC SYNTHESIS OF ALPHA-SUBSTITUTED-ALPHA- CYANOMETHYLALCOHOL