| abstract |
(57) [Problem] To provide an unsaturated polyester resin composition which is excellent in workability, is excellent in toughness, is hard to crack, and is suitable for molding materials which can be reduced in weight. SOLUTION: The number average molecular weight obtained by reacting a polybasic acid component containing an α, β-unsaturated polybasic acid or an anhydride thereof as an essential component with a polyhydric alcohol has a number average molecular weight of 5,000 to 3,000. An unsaturated polyester resin composition containing 0000 unsaturated polyester resin, a polymerizable monomer and an isocyanate compound. |