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    • 9. 发明授权
    • Yellow and magenta chromogenic leuco dyes for photothermographic elements
    • 用于光热敏成像元件的黄色和品红色显色无色染料
    • US5432041A
    • 1995-07-11
    • US161900
    • 1993-12-03
    • Raffaella BiavascoStefano ParodiSharon M. SimpsonKim M. Vogel
    • Raffaella BiavascoStefano ParodiSharon M. SimpsonKim M. Vogel
    • G03C8/40G03C1/498
    • G03C1/49827G03C1/49854
    • Photothermographic elements capable of producing a high density yellow or magenta image upon image-wise exposure and thermal development at a relatively low temperature and for a short period of time are described. The photothermographic elements of the invention comprise coated on a support base at least one light-sensitive emulsion layer comprising (a) a leuco dye reducing reducing agent, (b) a photosensitive silver halide, (c) an organic silver compound capable of being reduced by the leuco dye reducing agent, and (d) a binder; wherein the leuco dye reducing agent thereto comprises a chromogenic yellow or magenta leuco dye compound.The photothermographic elements of the invention may be used to obtain yellow and magenta images of suitable density in single color or multicolor photothermographic articles. At the same time the chromogenic leuco dye is stable enough not to be oxidized by oxygen of the air or by simple heating and to limit the fog formation after development.
    • 描述了能够在相对低的温度和短时间内在成像曝光和热显影时产生高密度黄色或品红色图像的光热敏成像元件。 本发明的光热敏成像元件包括在支撑基底上涂覆至少一种感光乳剂层,其包含(a)无色染料还原还原剂,(b)光敏卤化银,(c)能够还原的有机银化合物 通过无色染料还原剂,和(d)粘合剂; 其中所述无色染料还原剂包含显色黄色或品红色无色染料化合物。 本发明的光热敏成像元件可用于获得单色或多色光热成像制品中适合密度的黄色和品红色图像。 同时,显色无色染料足够稳定,不会被空气的氧气或简单的加热氧化,并且限制了显影后的雾形成。