Photographic elements containing infrared filter dyes

Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Antihalation or filter layer containing

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430512, 430517, 430592, 544372, 548427, G03L 184

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active

048761818

ABSTRACT:
A dye useful for absorbing infrared radiation in photographic elements, having the structure: ##STR1## is disclosed. In this formula R.sub.1 and R.sub.2 each independently represents sulfoalkyl, carboxyalkyl, or sulfatoalkyl of from 3 to 6 carbon atoms, having at least 3 carbon atoms in the alkyl chain between the nitrogen atom of each Z ring and the sulfo or sulfato group, and at least 2 carbon atoms in the alkyl chain between the nitrogen atom of each Z ring and the carboxy group.
R.sub.3 and R.sub.5 are each hydrogen or together represent the atoms necessary to complete 5- or 6-membered carbocyclic ring, and R.sub.4 represents hydrogen, alkyl of 1 to 4 carbon atoms, aryl, cyano, halogen, or ##STR2## where R.sub.6 and R.sub.7 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 ring.
X.sym. represents a cation.
Z.sub.1 and Z.sub.2 each independently represent the atoms needed to complete an indole, naphthindole or benzindole nucleus.

REFERENCES:
patent: 2968566 (1961-01-01), Riester
patent: 3482978 (1969-12-01), Fremia, Jr. et al.
patent: 3615544 (1971-10-01), Amano et al.
patent: 3866812 (1975-02-01), Kobayashi et al.
patent: 4362800 (1982-12-01), Takimoto et al.
patent: 4581325 (1986-04-01), Ketchin et al.
C.A. 11846u, Chemical Abstracts, vol. 66, 1967, p. 1172, Smith.
Abstract of Japanese Patent 62123454, 1962.

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