PHOTOGRAPHIC ELEMENTS INCORPORATING ANTIHALATION AND/OR ACUTANCE DYES

• Main Authors: LEA, BERNARD A, KITCHIN, JONATHAN P, BURROWS, RONALD W
• Format: Patent
• Language: English
• Published: 17.02.1988
• Edition: 4
• Subjects: ADHESIVES; AUXILIARY PROCESSES IN PHOTOGRAPHY; CHEMISTRY; CINEMATOGRAPHY; DYES; ELECTROGRAPHY; HOLOGRAPHY; LAKES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; 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

A photographic element of the conventional wet processed type or of the dry silver type which includes an antihalation or acutance dye which absorbs in the near infrared and has a relatively low visible absorption whilst retaining a high extinction coefficient at λmax. The dye is of the general formula:in which:m + p = 2,n is 0 or 1,s is 0 or 1,zl and Z2 independently represent the non-metallic atoms necessary to complete a heterocyclic nucleus of the type present in cyanine dyes,R1 and R2 independently represent an alkyl or substituted alkyl, alkenyl, substituted alkenyl or aralkyl group of up to 20 carbon atoms,R3 and R4 independently represent a hydrogen atom or an alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkoxy or substituted alkoxy group of up to 10 carbon atoms,R5. R6, R7 and R8, which together may not contain more than 12 carbon atoms, independently represent a hydrogen atom, an alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl or alkaryl group, or one of R5 and R6 together with one of R7 and R8 represent the necessary atoms to complete a carbocyclic ring in which case the others of R5 to R8 are absent,Q1 and Q2 together represent the non-metallic atoms necessary to complete an acidic nucleus of the type present in oxonol or merocyanine dyes.