G - Physics – 03 – C
Patent
G - Physics
03
C
96/205
G03C 1/815 (2006.01) C09B 23/01 (2006.01) C09B 23/08 (2006.01) G03C 1/83 (2006.01)
Patent
CA 1321316
-0- INFRARED FILTER DYES FOR PHOTOGRAPHIC ELEMENTS Abstract of the Disclosure A dye useful for absorbing infrared radiation in photographic elements, having the structure: Image is disclosed. In this formula, R1 and R2 each independently represents sulfoalkyl, carboxyalkyl, or sulfatoalkyl, from 2 to 4 carbon atoms, having 2 carbon atoms in the alkyl chain linking the nitrogen atom of each Z ring and the sulfo or sulfato group, and 1 carbon atom in the alkyl chain linking the nitrogen atom of each Z ring and the carboxy group. R3 and R5 are each hydrogen or together represent the atoms necessary to complete a 5- or 6-membered carbocycylic ring, and R4 represents hydrogen, alkyl of 1 to 4 carbon atoms, halogen, cyano, or Image , where R6 and R7 each independently represents alkyl of from 1 to 6 carbon atoms or aryl or together represent the non-metallic atoms necessary to form a 5- or 6-membered heterocyclic ring. X? represents a cation. Z1 and Z2 each independently represent the atoms-needed to complete an indole, naphthindole or benzindole nucleus.
563805
Collett David J.
Gingello Anthony D.
Parton Richard L.
Stegman David A.
Collett David J.
Eastman Kodak Company
Gingello Anthony D.
Gowling Lafleur Henderson Llp
Parton Richard L.
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