Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in photochromic articles
1 7 Photochromic 3H-naphtho[2,1-b]pyran compounds corresponding to formula I in which the groups Rto Rand B′ have defined meanings and the use of such photochromic compounds in synthetic resin articles of all types, particularly for ophthalmic purposes. The photochromic 3H-naphtho[2,1-b]pyran deriva...
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| Format: | Patent |
| Sprache: | eng |
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