| 摘要 |
PROBLEM TO BE SOLVED: To provide a process for producing porous particulates having a size of the order of microns with an easy operation, by making polymer seed particles dispersed in water absorb both a crosslinkable monomer and a polymerization initiator, thereafter polymerizing the crosslinkable monomer thereby to form a polymer having a composition different from that of the polymer seed particle. SOLUTION: Polymer seed particles which have been prepared by a soap-free polymerization, a dispersion polymerization and have a Cv value of 5% or less and an weight-average molecular weight of 10,000-300,000 are made to disperse into water. To this polymer seed particle aqueous dispersion is so added an emulsion containing 100 pts.wt. of a crosslinkable monomer and 0.1-10 pts.wt. of a polymerization initiator as to have a ratio of 20-100 pts.wt. of the crosslinkable monomer to 1 pt.wt. of the polymer seed particles, and the polymer seed particles are made to absorb the crosslinkable monomer, thereafter the crosslinkable monomer is polymerized, thus forming a polymer having a composition different from that of the polymer seed particle. As the crosslinkable monomer are used a divinyl benzene, a polyethylene glycol (meth) acrylate and so on.
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