| abstract |
A urethane resin composition having properties suitable for forming a building insulation layer without adding a foam stabilizer in a urethane resin composition having at least quasi-incombustibility. A urethane resin composition for forming a foam that constitutes a insulation material for a building includes a foam having at least quasi-incombustibility in a heat-release test complying with ISO-5660, the urethane resin composition containing at least a polyisocyanate compound, an ester polyol compound, a trimerization catalyst, an additive, and a non-silicon surface adjuster, and by not containing a foam stabilizer, the additive including red phosphorus as an essential component and being combined with a phosphate-containing flame retardant and/or a chlorine-containing flame retardant. |