A series of novel photochromic spiropyrans are disclosed in which a spiro-adamantane group is introduced into the 2-position of the benzopyran or naphthopyran ring. The spiropyran compounds of the invention exhibit heliochromic properties, i.e. they colour in sunlight and fade rapidly at ambient temperatures in the absence of U.V. light, making them good candidates for use in the manufacture of sunglasses. The invention includes lenses which darken in sunlight and incorporate the novel spiropyrans and a process for the preparation of the spiropyran compounds.
本发明公开了一系列新型光致变色螺
吡喃,其中苯并
吡喃或
萘并
吡喃环的 2 位引入了一个螺
金刚烷基团。本发明的螺
吡喃化合物具有日光变色特性,即在阳光下着色,在没有紫外光的环境温度下迅速褪色,因此是制造太阳镜的理想材料。本发明包括在阳光下变黑并含有新型螺
吡喃的镜片和制备螺
吡喃化合物的工艺。