申请人:Eastman Kodak Company
公开号:US05747236A1
公开(公告)日:1998-05-05
A photographic element comprises a support and at least one silver halide emulsion layer in which the silver halide is sensitized with a fragmentable electron donor of the formula X--Y, wherein X is an electron donor moiety and Y is a leaving group other than hydrogen, and wherein: 1) X--Y has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of X--Y undergoes a bond cleavage reaction to give the radical X.sup..cndot. and the leaving fragment Y. In a preferred embodiment of the invention, the radical X.sup..cndot. has an oxidation potential .ltoreq.-0.7V.
一种摄影元素包括支撑体和至少一层含有银卤化物的感光乳剂层,其中银卤化物以式X-Y的可分裂电子供体敏化,其中X是电子供体基团,Y是除氢以外的离去基团,且:1)X-Y的氧化电位在0到约1.4V之间;2)X-Y的氧化形式经历键裂解反应,以产生自由基X.sup..cndot.和离去片段Y。在发明的首选实施例中,自由基X.sup..cndot.的氧化电位.ltoeq.-0.7V。