Japan U-pica Company, Ltd.

Keizo Masawaki

The present invention relates to an O/W type aqueous dispersion which comprises mixing a radical polymerization type thermosetting resin and water together to uniformly disperse particles of the resin in the aqueous phase; the aqueous dispersion is stable and thixotropic and has excellent workability; moreover, as with a normal radical polymerization type thermosetting resin, the aqueous dispersion can be cured at ambient temperature or with heating in the presence of a curing agent and if necessary an accelerator, and the cured material obtained is a porous cured material having fine particles bound together and fine interconnected pores between the bound particles. Moreover, the present invention also relates to an FRP precision filter medium that comprises a cured material that is obtained by curing the above-mentioned O/W type aqueous dispersion in the presence of a reinforcing material, the cured material being a porous cured material that comprises a particle aggregate that contains the reinforcing material and has approximately spherical fine particles bound together therein, has communicating voids between the bound particles, and has fine interconnected pores having an effective pore diameter of 0.1 to 1.0 &mgr;m and a porosity of 10 to 40 vol %.

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Hiratsuka, Japan

Keizo Masawaki