Polycyclic spirophthalimide derivatives, process for their preparation and their use as fulgimides

摘要

A fulgimide compound which reversibly changes from a colorless state into a colored state upon the action of light including ultraviolet-rays, and a photochromic composition containing the compound. The fulgimide compound is of formula (I), wherein the represents a divalent aromatic hydrocarbon or unsaturated heterocyclic group, R¹ represents a monovalent hydrocarbon or heterocyclic group and represents a norbornylidene group, bicyclo[3,3,1]nonylidene group or adamantylidene group and R is perhalogenoalkyl, cyano, alkoxycarbonyl, alkylcarbonyl, arylcarbonyl, nitro ulfonyl, alkylsulfonyl, arylsulfonyl or aryloxycarbonyl.