Photographic element containing a magenta coupler having improved manufacturability and dye light stability
申请人:EASTMAN KODAK COMPANY
公开号:EP0854385A1
公开(公告)日:1998-07-22
The invention provides a photographic element comprising a silver halide emulsion layer having associated therewith a dye-forming coupler represented by Formula I:
wherein
X is hydrogen or a coupling-off group; and
R' is a tertiary alkyl group and R'' represents the group
in which R1, R2, and R3 are independently selected alkyl groups, provided that any two of R1, R2, and R3 may join to form a ring;
R4 is hydrogen or a substituent, provided that R3 and R4 may join to form a ring when R4 is a substituent; and
W is a substituent having the formula:
wherein Ra and Rb are independently selected from the group consisting of hydrogen, and alkyl or aryl groups;
本发明提供了一种感光元件,它包括一个卤化银乳剂层,该层与一个由式 I 表示的染料形成耦合剂相关联:
其中
X 是氢或偶联基团;及
R'是叔烷基,R''代表以下基团
其中 R1、R2 和 R3 是独立选定的烷基,条件是 R1、R2 和 R3 中的任意两个可连接成环;
R4 是氢或取代基,但当 R4 是取代基时,R3 和 R4 可连接形成一个环;以及
W 是具有以下式子的取代基
其中 Ra 和 Rb 独立地选自氢、烷基或芳基组成的组;