A photothermographic element comprising a support bearing an image forming system comprising:
(a) a photosensitive silver halide
(b) an organic silver compound
(c) a polymer binder and
(d) a reducing agent for the organic silver compound, characterised in that the reducing agent comprises a redox-dye-releasing compound of the general formula:
in which:
R represents an organic group which may be oxidatively cleaved to a thermally immobile form,
A represents a bond or a divalent linking group having a chain consisting of up to 12 atoms, which is linked to the carbonyl group via a carbon atom or an oxygen atom, and
D represents the chromophore of a thermally mobile dye.
一种光热成像元件,包括一个承载图像形成系统的支架,该系统包括
(a) 一种光敏卤化
银
(b) 有机
银化合物
(c) 聚合物粘合剂和
(d) 有机
银化合物的还原剂,其特征在于还原剂包括通式如下的氧化还原-
染料释放化合物:
其中
R 代表可被氧化裂解成热不流动形式的有机基团、
A 代表键或二价连接基团,其链由最多 12 个原子组成,通过一个碳原子或一个氧原子与羰基连接,以及
D 代表热移动
染料的发色团。