Abstract: An unsaturated polyester resin composition includes a resin component containing an unsaturated polyester and a polymerizable monomer, an aluminum hydroxide, and an expandable graphite. The mixing ratio of the aluminum hydroxide to 100 parts by mass of the resin component is 50 parts by mass or more and 300 parts by mass or less. The mixing ratio of the expandable graphite to 100 parts by mass of the resin component is 3 parts by mass or more and 10 parts by mass or less. The expandable graphite has an average particle size of 150 ?m or less.

Abstract: An electroconductive plate is prepared by molding an electroconductive resin composition comprising an electroconductive agent and a radical-polymerizable thermosetting resin system having an acid value in a specific range by a resin molding method. The electroconductive agent may be a carbon powder. The radical-polymerizable thermosetting resin system may comprise a radical-polymerizable resin and a radical-polymerizable diluent. The double bond equivalent of the radical-polymerizable resin is preferably about 200 to 1000. The glass transition temperature of the hardened product is preferably not lower than 120° C. The proportion (weight ratio) of the electroconductive agent relative to the radical-polymerizable thermosetting resin system [the former/the latter] is about 55/45 to 95/5.

Abstract: An electroconductive plate is prepared by molding an electroconductive resin composition comprising an electroconductive agent and a radical-polymerizable thermosetting resin system having an acid value in a specific range by a resin molding method. The electroconductive agent may be a carbon powder. The radical-polymerizable thermosetting resin system may comprise a radical-polymerizable resin and a radical-polymerizable diluent. The double bond equivalent of the radical-polymerizable resin is preferably about 200 to 1000. The glass transition temperature of the hardened product is preferably not lower than 120° C. The proportion (weight ratio) of the electroconductive agent relative to the radical-polymerizable thermosetting resin system [the former/the latter] is about 55/45 to 95/5.

Abstract: A separator for solid polymer-type fuel cell is produced by molding the resin composition which comprises an electroconductive agent and a radical-polymerizable thermosetting resin system by a resin molding method. The electroconductive agent comprises a carbon powder. The radical-polymerizable thermosetting resin system may comprise a radical-polymerizable resin (especially, a vinyl ester-series resin) and a radical-polymerizable diluent. It is preferred that the double bond equivalent of the radical-polymerizable resin may about 200 to 1,000 and that the hardened radical-polymerizable thermosetting resin system has a glass transition temperature of 120° C. or more. The weight ratio of the electroconductive agent to the radical-polymerizable thermosetting resin system may be about 55/45 to 95/5. Such a separator is suitable for fuel cell (in particular, solid polymer-type fuel cell), and can be produced with advantageous for commercial production.

Abstract: A low thermal expansion laminated plate which has excellent heat resistance, water resistance and toughness and whose average linear expansion coefficient within the temperature ranging from 40 to 150° C. is not higher than 20×10−6/° C. can be obtained by laminating and curing fiber-reinforced layers impregnated with a resin composition consisting of a radically polymerizable resin, radically polymerizable monomer and inorganic filler combined with a specific amount of a thermoplastic resin.