Blocked leuco dyes for photothermographic elements
    30.
    发明授权
    Blocked leuco dyes for photothermographic elements 失效
    用于光热敏成像元件的封闭无色染料

    公开(公告)号:US5492805A

    公开(公告)日:1996-02-20

    申请号:US269438

    申请日:1994-06-30

    IPC分类号: G03C8/40 C07C311/60 G03C1/498

    摘要: A photothermographic element containing a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer is provided. The emulsion layer comprises:(a) a photosensitive silver halide;(b) a non-photosensitive, reducible source of silver;(c) a leuco dye reducing agent; and(d) a binder;wherein the leuco dye reducing agent comprises a blocked leuco dye compound of the general formula L-R.sup.1, which is capable of being oxidized to a colored form, wherein:(i) L is a group remaining after removal of a hydrogen from a leuco dye; and(ii) R.sup.1 is a C(O)--NH--SO.sub.2 --R.sup.5 group wherein R.sup.5 is an aliphatic group or an aromatic group.

    摘要翻译: 提供了含有支持轴承至少一个可热显影的,感光的成像光热敏成像乳剂层的光热敏成像元件。 乳剂层包括:(a)光敏卤化银; (b)非光敏,可还原的银源; (c)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能够被氧化成着色形式的通式L-R1的封闭无色染料化合物,其中:(i)L是在从无色染料中除去氢后剩余的基团 ; 和(ii)R 1是C(O)-NH-SO 2 -R 5基团,其中R 5是脂族基团或芳族基团。