Polyurethane foam

Abstract

The present invention provides a polyurethane foam in which the boundary between the irradiated area and the surrounding area, even in dark places, is more clearly visible than in conventional foams. [Solution] The polyurethane foam is obtained by reacting raw materials containing a polyol component, a polyisocyanate component, a blowing agent, a catalyst, and a foam stabilizer, and contains a phosphorescent material and a colorant, wherein the phosphorescent material is contained in an amount of more than 1 part by mass but less than 20 parts by mass per 100 parts by mass of the polyol component, and the color difference ΔE is based on white. * ab The value is in the range of 10 to 60.

Claims

1. A polyurethane foam obtained by reacting raw materials containing a polyol component, a polyisocyanate component, a foaming agent, a catalyst, and a foam stabilizer, Contains phosphorescent material and colorant, The above-mentioned phosphorescent material is contained in an amount greater than 1 part by mass but less than 20 parts by mass per 100 parts by mass of the polyol component. Color difference ΔE relative to white ＊ ａｂ A polyurethane foam characterized in that the ratio is in the range of 10 to 60.

2. The polyurethane foam according to claim 1, comprising 0.1 parts by mass or more and less than 2.0 parts by mass of the coloring agent per 100 parts by mass of the polyol component.

3. When irradiated using the following specified irradiation method, A luminance meter, with a distance of 100 cm from the polyurethane foam and a measurement angle of 0.2 degrees, measured a luminance X of 50 mcd / m² at the center of the irradiated area where the excitation light was applied. ２ That's all. The luminance Y measured by the luminance meter at an out-of-irradiation measurement point 5 cm away from the center of the irradiation area was 0 mcd / m ２ More than 80mcd / m ２ The following: The luminance difference obtained by subtracting the luminance Y from the luminance X is 50 mcd / m². ２ The polyurethane foam according to claim 1 or 2, wherein the above is true. The predetermined irradiation method involves aligning the light-emitting surface of the excitation light irradiation device and the irradiation side of the polyurethane foam parallel to each other on the upper surface of the test stand, adjusting the distance between the light-emitting surface and the irradiation side to 45 cm, fixing the excitation light irradiation device and the polyurethane foam, then turning on the excitation light irradiation device in a dark place and irradiating the polyurethane foam for 1 minute to allow it to absorb light, after which the excitation light irradiation device (however, the excitation light irradiation device is a nickel light, with a rated luminous flux of 105 lm, an illuminance of 19,000 to 20,000 lx at 45 cm, a color temperature of 6,000 K, and an irradiation angle of 20 degrees) is turned off.

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