Photographisches Element das einen stabilen Aryloxypyrazolon-Kuppler enthält sowie Verfahren unter Verwendung desselben

• Main Authors: MOOBERRY, JARED B, WU, ZHENG ZI, ANDERSON, LAWRENCE G, POSLUSNY, JERROLD N
• Format: Patent
• Language: German
• Published: 13.03.2003
• Edition: 7
• Subjects: AUXILIARY PROCESSES IN PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS

A photographic element comprises a light-sensitive silver halide emulsion layer having associated therewith a coupler based on a 1-aryl-2-pyrazolin-5-one ring and represented by formula I: wherein: Ar and Ar are each independently aryl groups comprising a carboaromatic or heteroaromatic ring; X, Y, and Z are bonded to a carbon atom alpha to the 3-position and are independently selected from the group consisting of hydrogen and substituent groups such that the sum of the Taft sigma * values for X, Y, and Z is at least 1.5; R represents n independently selected substituent groups bonded to the Ar ring, provided that the sum of the appropriate Hammett sigma constants for all R substituent groups is at least 0.3, and provided further that two of X, Y, and Z may join to form a ring; and n is 0 to 5; provided that R may not be a nitro group ortho to the oxygen atom bonding Ar to the 1-aryl-2-pyrazolin-5-one ring.