Photochromic spirodihydrophenanthropyrans

Details Photochromic spirodihydrophenanthropyrans Photochromic spirodihydrophenanthropyrans

C - Chemistry, Metallurgy

09

K

C09K 9/02 (2006.01) C08K 5/00 (2006.01)

Patent

CA 2628501

The present invention relates to specific photochromic spirodihydrophenanthropyrans and to their use in plastics of all kinds, particularly for ophthalmic purposes. The compounds of the invention are photochromic pyran compounds derived from 9,10-dihydrophenanthrene, at least one of the two carbon atoms in position 9 or 10 belonging to a further ring system and thus forming a spiro linkage point.

La présente invention concerne des spirodihydrophénanthropyranes photochromes spécifiques, ainsi que leur utilisation dans des plastiques de tout type, notamment pour des applications ophtalmiques. Les composés selon l'invention sont des composés photochromes de pyrane, dérivés de 9,10-dihydrophénanthrène, au moins un des deux atomes de carbone en position 9 ou 10 faisant partie d'un système cyclique supplémentaire, formant ainsi un site de liaison spiro.

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