Photographic element containing pyrazolone pug releasing coupler and imaging process employing same

• Main Authors: SLUSAREK, WOJCIECH KAZIMIERZ, YANG, XIQIANG K, POSLUSNY, JERROLD NEAL
• Format: Patent
• Language: English; French; German
• Published: 05.07.2000
• Edition: 7
• Subjects: ADHESIVES; AUXILIARY PROCESSES IN PHOTOGRAPHY; CHEMISTRY; CINEMATOGRAPHY; DYES; ELECTROGRAPHY; HETEROCYCLIC COMPOUNDS; HOLOGRAPHY; LAKES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; ORGANIC CHEMISTRY; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; POLISHES

Disclosed is a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a pyrazol-5-one coupler bearing a 4-aryloxy coupling-off group containing a group capable of releasing a photographically useful group (PUG) wherein: (1) the pyrazol-5-one ring contains a 1-aryl substituent which in turn contains, in a position ortho to the bond linking it to the pyrazolone ring, a secondary carbonamido group or a secondary sulfonamido group; (2) the pyrazol-5-one ring contains either (a) a 3-aryl substituent which in turn contains substituents for which the sum of the Hammett's sigma constant values is -0.3 or higher or (b) a 3-alkyl substituent; and (3) the 4-aryloxy coupling-off group: (a) contains ring substituents selected so that the sum of the Hammett's sigma constant values for all substituents on the phenoxy ring is at least 0.4 but does not contain a nitro substituent in the ortho position, and: (b) contains in at least one position ortho or para to the oxygen atom bonding the aryloxy group to the pyrazolone ring a substituent comprising a tetrahedral carbon atom bonded to a PUG or to another timing group which timing group is in turn bonded to a PUG directly or through a further timing group; and provided that substituents may join to form one or more additional rings.