| 摘要 |
PURPOSE:To obtain the photorecording medium capable of forming a record high in density and small in clouding due to crystalization by forming a thin film of a diarylethene type photochromic compound on a base and forming a reflective film on this thin film. CONSTITUTION:This photochromic compound is represented by formula I in which each of Ar<1> and Ar<2> is a group of formula II or III or the like; R<1> is alkyl, acyl, or aryl; each of R<2> and R<7> is alkyl, perfluoroalkyl, or alkoxy; and each of R<3>-R<6>, R<8>, and R<9> is alkyl, acyl, alkoxy, dialkylamino, aryl, or cyano. The base can be used so far as it transmits the light to be used for writing in and writing out and erasing, and it is embodied by a glass plate, polycarbonate, polymethyl methacrylate, polyester, and polystyrene plates or films and the like. |
