| 摘要 |
PURPOSE:To provide a resin compsn. which is black in appearance, can shield the seeing of the inside through the compsn. and allows transmission of only the visible rays in a certain specific wavelength region by compounding a prescribed dye mixture with a synthetic resin having good ray transmittability, thereby preparing the resin compsn. CONSTITUTION:Mainly the dye mixture essentially composed of a green dye and red dye and other dyes such as yellow dye and blue dye are compounded with a polystyrene resin, etc., as the synthetic resin having the good ray transmittability. The dye mixture is previously kneaded with the synthetic resin and the desired black shielding material is molded. This resin compsn. has <=15 L value in an Lab color specification system and <=25 (a<2>+b<2>)<1/2> value and the average ray transmittance thereof to the visible rays of 700-780nm wavelength region is >=35%. Glowing of a light source which is substantially black in appearance and emits visible rays of 700-780nm wavelength region, for example, a tungsten lamp which emits white light or pilot lamp which emits red light is thereby enabled. |
