| 摘要 |
PROBLEM TO BE SOLVED: To provide an unsaturated polyurethane resin composition capable of developing high transparency in heat and pressure molding and suitable for producing an artificial stone molded product excellent in crack resistance, resistance to hot water, chemical resistance, etc., to provide an artificial stone molding material, and to provide the artificial stone molded product. SOLUTION: This unsaturated polyurethane resin composition contains a vinyl ester resin (E) which is given by dissolving a vinyl ester (C) obtained by reacting a bisphenol-type epoxy resin (A) with an unsaturated monobasic acid (B) in a polymerizable monomer (D), and further contains a polyisocyanate (I) which contains an isocyanate prepolymer (H) obtained by reacting a glycol (F) with a diisocyanate (G), wherein the resin composition satisfies: (1) an average epoxy equivalent of the bisphenol-type epoxy resin (A) is 400 or less; (2) a number-average molecular weight of the glycol (F) is 300 or more; and (3) a mass ratio of the isocyanate prepolymer (H) to the vinyl ester resin (E) [(H)/(E)] is in a range of 0.1 to 0.6. COPYRIGHT: (C)2006,JPO&NCIPI |
