The application discloses a two-layered coating system using an ultraviolet absorber in its inner layer (called the blocking layer), furthest away from the source of ultraviolet exposure, with a fluorescent material that reflects ultraviolet radiation back as blue light. The ultraviolet absorber in the inner layer is used in sufficient concentration to have an ultraviolet cutoff, which can be extended with the fluorescent material. The ultraviolet block material of the present invention has transmittance of the light within a range of wavelength of 300-380 nm of 10% or less, preferably transmittance of the light within a range of wavelength of 300-390 nm of 10% or less, and, particularly preferably, transmittance of the light within a range of 300-400 nm of 10% or less, while it has a transmittance of the light within a range of 420-800 nm wavelength of 90% or more, or, preferably, 95% or more.
该申请公开了一种双层涂层系统,其内层(称为阻挡层)使用
紫外线吸收剂,距离紫外线照射源最远,内层使用的荧光材料可将紫外线辐射反射为蓝光。内层
紫外线吸收剂的使用浓度足以产生紫外线截止点,荧光材料可以延长紫外线截止点。本发明的紫外线阻隔材料对波长 300-380 纳米范围内的光的透过率为 10%或更低,最好对波长 300-390 纳米范围内的光的透过率为 10%或更低,尤其最好对波长 300-400 纳米范围内的光的透过率为 10%或更低,而对波长 420-800 纳米范围内的光的透过率为 90%或更高,最好为 95%或更高。