Optical filter agents and photographic products and processes co

Details Optical filter agents and photographic products and processes co Optical filter agents and photographic products and processes co

1981-10-08

1986-11-04

Hines, Robert V.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564251, C07C10912

Patent

active

046211560

ABSTRACT:
Optical filter agents and photographic products and processes using same are disclosed. The optical filter agents are pH-sensitive hydrazone compounds conforming to the following structural formula: ##STR1## where R is any group which can provide a double bond for conjugation with the ##STR2## portion of the compound to provide light-absorbing capability or color for the agent at a pH above its pKa, X is a substituent of R providing at least one electron-withdrawing group and each R' can be defined as any substituent that does not impair the light-absorbing capacity of the compound at a pH above the pKa thereof. The pH-sensitive optical filter agents have a highly colored light-absorbing form at a pH above the pKa and are substantially non-absorbing at a pH below the pKa. The pH-sensitive optical filter agents are useful in photographic film units and processes for the protection of photoexposed photosensitive elements against the occurrence of fogging during in-light development.

REFERENCES:
patent: 3414650 (1968-12-01), Catino et al.
patent: 3826844 (1974-07-01), Moon
patent: 3923506 (1975-12-01), Bergfjord et al.
patent: 3943132 (1976-03-01), Schirmann et al.
patent: 4258181 (1981-03-01), Murdock et al.

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