| 摘要 |
To provide a solar-radiation-shielding material for vehicle windows, in which the visible light transmittance is reduced, and the value of solar radiation transmittance/visible light transmittance, which is an index to solar-radiation shielding properties, has been reduced to less than. In the solar-radiation-shielding material for vehicle windows, fine particles having a heat-ray-shielding function are a mixture including at least one type of fine particles selected from the group consisting of lanthanum hexaboride, titanium nitride, and tungsten oxide and at least one type of fine particles selected from the group consisting of antimony-doped tin oxide, tin-doped indium oxide, and a composite tungsten oxide defined by a general formula: MYWOZ (0.001 ‰¤ Y ‰¤ 1.0, and 2.2 ‰¤ Z ‰¤ 3.0), and the visible light transmittance of the solar-radiation-shielding material is in the range of 5% or more and 40% or less, and the solar radiation transmittance and the visible light transmittance of the solar-radiation-shielding material satisfy the following Expression 1, and the transmission color of the solar-radiation-shielding material satisfies the following Expression 2. Expression 1: solar radiation transmittance/visible light transmittance < 1, and Expression 2: -14 < a* < 2, and -8 < b * < 2. |
