申请人:Minnesota Mining and Manufacturing Company
公开号:US05424183A1
公开(公告)日:1995-06-13
Heat-developable photothermographic materials capable of providing stable color images of high resolution. These materials comprise a support bearing a layer of an image-forming composition comprising: (a) a photosensitive silver halide, (b) an organic silver compound, (c) a reducing agent for silver ion, and (d) a binder, The reducing agent comprises a ballasted leuco dye compound. The ballasted leuco dye compound comprises a compound of the general formula: D--B wherein D represents the reduced chromophore of a thermally mobile dye; and B represents an organic group that reduces the thermal mobility of D in the aforementioned binder, said organic group B capable of being oxidatively cleaved. The molecular weight of B must not be so high that the resulting amount of D in the emulsion layer is insufficient to yield a dye image having a reflection optical density of at least 0.3 or a transmission optical density of at least 0.2. Advantages of the heat-developable photothermographic materials of this invention include the following: (1) capability of providing of pure, clear, and stable positive dye images at high photographic speed; (2) low silver requirement; and (3) reduced background stain.
能够提供高分辨率稳定彩色图像的热显影光敏材料。这些材料包括承载着图像形成组分层的支撑,该组分层包括:(a)光敏银卤化物,(b)有机银化合物,(c)银离子还原剂和(d)粘合剂。还原剂包括一个负载了偶氮染料化合物的化合物。负载了偶氮染料化合物包括一个通用公式为D-B的化合物,其中D代表具有热运动染料的还原色团;B代表在上述粘合剂中减少D的热运动性的有机基团,该有机基团B能够被氧化性割裂。B的分子量不应过高,以至于乳胶层中的D的数量不足以产生反射光密度至少为0.3或透射光密度至少为0.2的染料图像。此发明的热显影光敏材料的优点包括:(1)能够以高速提供纯净、清晰、稳定的正向染料图像;(2)银需求低;和(3)背景污染减少。