PURPOSE:To provide a photosensitive compsn. which ha improved thermal stability in a developed state and makes it possible to maintain a developed color image for a long period of time, by dissolving a benzothiazolinospiropyran compd. in a bisphenol A type polyether resin. CONSTITUTION:A benzothiazospiropyran compd, of the formula (wherein R1 is a 1-10 C alkyl, R2 is a 1-10 C alkyl, phenyl; R3 is H, halogen, methoxy, a 1-5 C alkyl; R4 is H, a 1-5C alkyl, methyl, methylthio) is dissolved or dispersed in a bisphenol A tupe polyether resin. The spiropyran is used in an amount of pref. 3-60wt% based on that of the bisphenol A type polyether resin. When the amount of the spiropyran is too small, photochromic performance is insufficient, while when the amount is too large, the spiropyran is precipitated as a crystal in a binder unfavorably.
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