@ The organic photochromic composition of this invention comprises trifluoromethyl substituted spiro (indoline-2,3'-(3M napth-(2,1-b)(1,4)oxazine)(SO) dyes. This new class of (SO) photochromic compounds has a more neutral color when subjected to ultraviolet light irradiation.
When used with a photochromic plastic embodiment, these (SO) compounds give the plastic embodiment a high luminous transmittance in an unactivated state, which can be darkened significantly when subjected to ultraviolet light irradiation. When an ultraviolet stabilizer is used with the photochromic compositions of this invention, the light fatigue resistance of the (SO) dye is improved and it will not hinder the photocolorability of the photochromic composition.
本发明的有机光致变色组合物包括三
氟甲基取代的螺(
吲哚啉-2,3'-(3M
萘-(2,1-b)(1,4)恶嗪)(SO)
染料。这一类新的 (SO) 光致变色化合物在紫外线照射下具有更中性的颜色。
与光致变色塑料一起使用时,这些(SO)化合物可使塑料在未活化状态下具有较高的透光率,但在紫外线照射下,透光率会明显变暗。当紫外线稳定剂与本发明的光致变色组合物一起使用时,(SO)
染料的耐光疲劳性会得到改善,并且不会妨碍光致变色组合物的光致变色性。