Photochromic materials having extended pi-conjugated systems and compositions and articles including the same
作者： Stephen D. Straight , Victor A. Montes , Beon-Kyu Kim , Frank F. Molock , Huayun Yu
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摘要: The present invention provides ophthalmic devices comprising at least one photochromic material which is an indeno-fused naphthopyran having a pi-conjugation extending group bonded to the 11-position of naphthopyran, pendent halo-substituted thereto. extends system said naphthopyran. 13-position substantially free spiro-substituents. further materials specified structure, compositions, articles and optical elements that include materials. Other non-limiting embodiments relate methods making
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