PURPOSE: To obtain a material high in sensitivity by enabling a dye moiety shifted in the max. absorption wavelength to be obtained at the time of reaction with the oxidation product of a color developing agent.
CONSTITUTION: The dye moiety can be formed by considering the performance of the dye to be produced after cleaving of a blocking group and designing the molecular structure so as to functionally separate the moiety for reacting with the oxidation product of a color developing agent from the dye moiety as the first system or to produce 2 dye molecules from one molecule of the the oxidation product of a color developing agent as the second system. Since the freedom for selecting the dye is enlarged as compared with the conventional system, brown-developing dyes difficult to be prepared, dyes superior or high in spectral absorption, and the like can be selected in a comparatively wide range, thus permitting color reproduction, image storage stability, increase of sharpness by reduction of film thickness, etc., to be improved.
ONO MITSUNORI
ITO ISAMU
OBAYASHI KEIJI
TAMOTO KOUJI
NAKAMURA YOSHISADA
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