The present invention relates to photochromic 2H-naphtho[1,2-b]pyrans as well as their use in synthetic resins of all types, especially for ophthalmic purposes. In particular, the present invention relates to photochromic naphthopyran compounds, for which a further ring system is bonded to the f side of the naphthopyran. The inventive photochromic dyes generally have the general formula (I)
1
wherein n, R
1
, R
2
, R
3
, X, B and B′ are defined as in claim 1. The inventive compounds are distinguished by good darkening and decolorizing properties and a very good service life.
本发明涉及光致变色 2H-
萘并lsqb;1,2-b]
吡喃以及它们在各类合成
树脂中的用途,尤其是用于眼科用途。本发明尤其涉及光致变色
萘并
吡喃化合物,其
萘并
吡喃的 f 侧还键合了另一个环系。本发明的光致变色
染料一般具有通式 (I)
1
其中 n、R
1
, R
2
, R
3
X、B 和 B′的定义如权利要求 1 所述。本发明的化合物具有良好的变黑和脱色性能,使用寿命长。