| abstract |
(57) The present invention is a photochromic compound having the formula (I), wherein R 1 is an asymmetric aliphatic monocyclic group having the formula (II), wherein l = 1-12, and R 9 Is H or, when at least one R 9 group is not H, an alkyl, alkoxy, dialkylamino, alkyl ester or CN group, and R 2 -R 7 can have various meanings , A represent a (hetero) aromatic ring which may be substituted, and n is an integer. Applications include the manufacture of photochromic products made from organic polymers, particularly lenses. |