Fulgimide compounds, use of them, and compositions containing the same

摘要

A novel fulgimide compound in which the nitrogen atom of the imide ring is substituted by a phenyl group having an electron-attracting group at least at the meta position, which is represented by the following general formula (I): Äwherein the group (a) of the following formula is a divalent aromatic hydrocarbon group or unsaturated heterocyclic group, each of which may have a substituent(s); the group (b) of the following formula is a norbornylidene, bicycloÄ3.3.1Ünonylidene or adamantylidene group, and R<2> is an electron-attracting groupÜ and its use as a photochromic material. The fulgimide compound of the present invention has a higher color density in a color-developed state than conventional photochromic compounds.