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    • 7. 发明授权
    • Flexible ultraviolet radiation transmitting filters
    • 灵活的紫外线辐射传输滤波器
    • US4167490A
    • 1979-09-11
    • US642713
    • 1975-12-22
    • Catharine E. Looney
    • Catharine E. Looney
    • B29D11/00F21V9/00G02B1/04G02B5/22
    • F21V9/00B29D11/00634G02B1/04G02B5/223Y10T428/31786
    • Flexible filters capable of transmitting radiation in the spectral range of 315 to 380 nm and absorbing radiation in the spectral range of 400 to 550 nm consist essentially of a thin flexible film, e.g., polyethylene terephthalate containing or having coated thereon a dye in a concentration of 15 to 60 mg/dm.sup.2 and optionally, as a component of the coating, a thermoplastic organic binder, e.g., cellulose acetate butyrate, present in the coating with the dye, said dye being of the formula: ##STR1## where R.sub.1 is lower alkyl of 1 to 5 carbon atoms; R.sub.2 and R.sub.3, which may be the same or different, are selected from the group consisting of R.sub.1, 2-cyanoethyl, 2-hydroxyethyl and ##STR2## or form a saturated 5- or 6- membered ring; R.sub.4 is taken from the class consisting of lower alkyl of 1 to 5 carbon atoms, aryl or alkaryl of 6 to 9 carbon atoms, and aralkyl. The filters are useful in exposing dual response photosensitive materials with ultraviolet radiation sources which contain appreciable quantities of visible radiation.
    • 能够在315至380nm的光谱范围内传输辐射并且在400至550nm的光谱范围内吸收辐射的柔性滤光器基本上由薄的柔性膜组成,例如含有或在其上涂覆浓度为 15至60mg / dm 2,并且任选地,作为涂层的组分,存在于染料的涂层中的热塑性有机粘合剂,例如乙酸丁酸纤维素,所述染料具有下式:其中R 1是低级烷基 1至5个碳原子; R2和R3可以相同或不同,选自R1,2-氰基乙基,2-羟乙基和/或形成饱和的5-或6-元环; R 4取自1至5个碳原子的低级烷基,6至9个碳原子的芳基或烷芳基和芳烷基。 这些滤光片可用于将双重响应感光材料暴露于含有明显量的可见光的紫外线辐射源。