申请人:——
公开号:US20020169315A1
公开(公告)日:2002-11-14
Photochromic pyran compounds and their use in synthetic resin objects of all types, especially for ophthalmic applications, particularly spiro compounds having a fluorene structure derived from naphthopyrans, which are known as spirofluorenopyrans. By introducing respectively only one strongly electron donating or withdrawing group at specific positions in the periphery of the pyran dye, photochromic compounds obtained which in the excited state are distinguished by an expanded color spectrum, while simulataneously offering comparably good bleaching rates and good durability.
光致变色吡喃化合物及其在各类合成树脂物体中的应用,特别是在眼科应用中的应用,尤其是具有从萘并吡喃衍生而来的芴结构的螺并化合物,这种化合物被称为螺芴并吡喃。通过在吡喃染料外围的特定位置分别只引入一个强电子供体或析出基团,可获得光致变色化合物,这种化合物在激发态下具有扩展的色谱,同时具有相当好的漂白率和良好的耐久性。