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An unsaturated polyester resin composition for use in pressure molding, which comprises an unsaturated polyester resin and fillers consisting essentially of (a) calcium carbonate powder which passes a 325 mesh sieve, (b) an inorganic mineral particulate which passes a 12 mesh sieve and is retained o

An unsaturated polyester resin composition for use in pressure molding, which comprises an unsaturated polyester resin and fillers consisting essentially of (a) calcium carbonate powder which passes a 325 mesh sieve, (b) an inorganic mineral particulate which passes a 12 mesh sieve and is retained on a 200 mesh sieve and (c) glass fibers having a length larger than 0.2 mm, wherein the ratio by weight of (a) to (b) is within a range of from 0.3 to 10, the ratio of (a)+(b) to the unsaturated polyester resin is within a range of from 1.5 to 7, and the ratio of (c) to the total weight of the resin, calcium carbonate, silica sand and glass fiber is within a range of from 0.01 to 0.25.

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An unsaturated polyester resin composition for use in pressure molding, which comprises: (I) a liquid mixture comprising an unsaturated polyester resin of a polycondensate or condensate synthesized from an unsaturated or saturated polybasic acid or anhydrides thereof, and hydroxyl compounds, or prec

An unsaturated polyester resin composition for use in pressure molding, which comprises: (I) a liquid mixture comprising an unsaturated polyester resin of a polycondensate or condensate synthesized from an unsaturated or saturated polybasic acid or anhydrides thereof, and hydroxyl compounds, or precursors thereof, an ethylenically unsaturated compound monomer in an amount of 20 to 50% by weight, based on the mixture, and a curing catalyst in an amount effective for the polymerization reaction between the polyester resin and the compound monomer, said mixture having a viscosity of 50 to 50,000 centipoises at 25°C., and (II) a filler consisting essentially of, (a) a calcium carbonate powder, (b) a silica sand having a particle size larger than said powder and smaller than 1500 m0.3 to 10, the ratio of (a) and (b) to (I) is within a range of from 2.5 to 6, and the ratio of (c) to the total weight of (I) and (II) is within a range of from 0.01 to 0.25.