PURPOSE: To obtain an aqueous dispersion of an ultra-microparticulate cross- linked diallyl phthalate polymer being excellent in solvent resistance, mechanical properties, and dimensional stability having good mixability and dispersibility in another resin and being desirable as a property modifier by polymerizing a monomer in the presence of a water-soluble polymerization initiator and in the absence of a surfactant and to obtain ultra-microparticles by drying the dispersion.
CONSTITUTION: The polymerization is performed under conditions in which the concentration of diallyl phthalate in aqueous solution is 15wt.% or below, 7-30wt.%, based on the diallyl phthalate, water-soluble polymerization initiator is present, and no surfactant is present. According to this process, an aqueous dispersion of an ultra-microparticulate cross-linked diallyl phthalate of a particle diameter of 10-300nm can be obtained. Examples of the diallyl phthalates used include diallyl orthophthalate, diallyl isophthalate, and diallyl terephthalate. Desirable examples of the water-soluble polymerization initiators used include persulfates such as potassium persulfate, sodium persulfate and ammonium persulfates.
KOIDE KATSUHIRO
MATSUMOTO AKIRA
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