申请人:MINNESOTA MINING AND MANUFACTURING COMPANY
公开号:EP0294099A2
公开(公告)日:1988-12-07
A photothermographic element comprising a support bearing a photothermographic medium, the medium comprising a light sensitive silver halide in reactive association with a silver salt of an organic acid and a colour generating reducing agent which is a leuco compound which is oxidisable by silver ions into a coloured dye of the general formula:
in which:
n = 0, 1 or 2,
R¹ represents H, CN, lower alkyl of 1 to 5 carbon atoms, aryl or COOR⁶ in which R⁶ is lower alkyl of 1 to 5 carbon atoms or aryl,
R² and R³ independently represent CN, NO₂, COOR⁶, SO₂R⁶, CO.R⁶ in which R6 is as defined above or R² and R³ together represent the necessary atoms to form a 5- or 6-membered carbocyclic or heterocyclic ring having ring atoms selected from C, N, O and S atoms, which carbocyclic or heterocyclic rings possess at least one conjugated electron withdrawing substituent,
R⁴ and R⁵ independently represent H, CN or lower alkyl of 1 to 5 carbon atoms or together represent the necessary atoms to complete a 5 or 6-membered carbocyclic ring, and
Ar represents:
a) a thienyl group which may be substituted with one or more lower alkyl groups of 1 to 5 carbon atoms,
b) a furyl goup which may be substituted with one or more lower alkyl groups of 1 to 5 carbon atoms or
c) a phenyl group which may be substituted with one or more groups selected from halogen, hydroxy, lower alkyl of 1 to 5 carbon atoms, lower alkoxy of 1 to 5 carbon atoms, NR⁷R⁸ in which R⁷ and R⁸ are independently selected from H, lower alkyl group of 1 to 5 carbon atoms which may possess substituents selected form CN, OH, halogen and phenyl, and phenyl group optionally substituted with substituents selected from OH, halogen, lower alkyl of 1 to 5 carbon atoms or lower alkoxy of 1 to 5 carbon atoms or R⁷ and R⁸ together represent the necessary atoms to complete a morpholino group, or said phenyl group may be part of a larger ring structure comprising two or more rings which may be aromatic or heterocyclic containing up . to 20 ring atoms selected from C, N, 0 and S.
一种光热成像元件,包括一个承载光热成像介质的支架,该介质包括一个与有机酸银盐反应结合的光敏卤化银和一个可被银离子氧化成通式为彩色染料的白基化合物的显色还原剂:
其中
n = 0、1 或 2、
R¹ 代表 H、CN、1-5 个碳原子的低级烷基、芳基或 COOR⁶,其中 R⁶ 是 1-5 个碳原子的低级烷基或芳基、
R² 和 R³ 独立地代表 CN、NO₂、COOR⁶、SO₂R⁶、CO.R⁶,其中 R6 如上定义,或 R² 和 R³ 共同代表形成 5 或 6 元碳环或杂环所需的原子,该碳环或杂环的环原子选自 C、N、O 和 S 原子,该碳环或杂环具有至少一个共轭取电子取代基、
R⁴ 和 R⁵ 独立地代表 H、CN 或 1 至 5 个碳原子的低级烷基,或共同代表完成 5 或 6 元碳环所需的原子,以及
Ar 代表
a) 可被一个或多个 1 至 5 个碳原子的低级烷基取代的噻吩基、
b) 可被一个或多个 1 至 5 个碳原子的低级烷基取代的呋喃基,或
c) 可被一个或多个基团取代的苯基,这些基团选自卤素、羟基、1 至 5 个碳原子的低级烷基、1 至 5 个碳原子的低级烷氧基、NR⁷R⁸,其中 R⁷ 和 R⁸ 独立选自 H、1 至 5 个碳原子的低级烷基(可具有选自 CN、OH、卤素和苯基的取代基)、R⁷ 和 R⁸ 共同代表完成一个吗啉基团所需的原子,或者所述苯基可 以是一个更大的环状结构的一部分,该环状结构由两个或多个环组成,这些环可以是芳香族环, 也可以是杂环,最多包含......个环原子。至 20 个选自 C、N、0 和 S 的环原子。