Abstract: Disclosed is a reactive particulate resin which is characterized by each particle thereof having a core of three-dimensionally crosslinked resin having a degree of crosslinking from 0.05 to 2.0 mmol/g, and a shell formed thereon having a radical-polymerizable ethylenic unsaturated bond and is formed by polymerization of one or more polyfunctional monomers (A) and one or more non-aromatic radical-polymerizable monomers (B), the polyfunctional monomer (A) having in the molecule (a) at least one species of 1-monosubstituted and 1,1-disubstituted radical-polymerizable ethylenic unsaturated bonds and also (b) at least one of at least one species of 1,2-disubstituted, 1,1,2-trisubstituted, and 1,1,2,2-tetrasubstituted radical-polymerizable ethylenic unsaturated bonds.

Abstract: The invention provides a thermosetting resin composition for thermoforming which comprises 100 parts by weight of thermosetting resin, 100-400 parts by weight of inorganic filler, and 5-30 parts by weight of reactive particulate resin having on the surface reactive group(s) crosslinkable with said thermosetting resin.

Abstract: Disclosed is a composition for formation of a cured resin foam, which comprises (A) a curable resin composition comprising an unsaturated polyester prepolymer and an ethylenically unsaturated monomer, (B) an inorganic powder composed of a carbonate and/or bicarbonate, (C) an aqueous solution of a water-soluble inorganic compound containing a neutralizable acid radical and being capable of forming a colloidal oxide or hydroxide and being gelled by neutralization or an acidic aqueous sol of an inorganic oxide or hydroxide containing a neutralizable acid radical and being capable of being gelled by neutralization, and (D) a substantially water-insoluble surface active agent having a W/O type emulsion-forming capacity, wherein an emulsion structure having a continuous phase of the component (A) and a dispersed particle phase of the component (C) is formed.