| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyurethane resin composition which has excellent moist heat resistance, flame retardancy, electrical insulating properties and workability and hardly causes a chemical stress crack on a resin case.SOLUTION: There is provided a polyurethane resin composition which comprises a hydroxyl group-containing compound, an isocyanate group-containing compound and a metal hydroxide. The hydroxyl group-containing compound contains a polybutadiene polyol and a castor oil-based polyol, the metal hydroxide of 55 to 80 pts.mass is contained based on 100 pts.mass. of the polyurethane resin composition, and the mass ratio between the castor oil-based polyol (B) and the metal hydroxide (C) is 1:5 to 1:10. |
