Silver halide elements containing blocked pyrazolone magenta dye

Details Silver halide elements containing blocked pyrazolone magenta dye Silver halide elements containing blocked pyrazolone magenta dye

1980-02-26

1981-08-11

Brown, J. Travis

Radiation imagery chemistry: process, composition, or product th

Imaged product

Nonsilver image

430381, 430386, 430387, 430548, 430554, 430555, 430558, G03C 700

Patent

active

042834724

ABSTRACT:
Novel 5-pyrazolone magenta dye-forming couplers are blocked with a coupler moiety which yields an alkali-soluble or colorless reaction product. The coupler moiety is joined via its coupling position to the enol oxygen of the 5-pyrazolone and is displaced therefrom during processing as a result of reaction by means of oxidized color developing agent to thereby activate the 5-pyrazolone coupler. These couplers have good reactivity and good resistance to aerial contaminants, such a formaldehyde, and can be incorporated in photographic emulsions and elements.

REFERENCES:
patent: T887007 (1971-06-01), Dallon et al.
patent: 2436130 (1948-02-01), Weissberger et al.
patent: 2575182 (1951-11-01), Martin
patent: 2706685 (1955-04-01), Salminen
patent: 2865748 (1958-12-01), Feniak et al.
patent: 3888680 (1975-06-01), Fujiwhara et al.
patent: 4123281 (1978-10-01), Monbaliu et al.
patent: 4130427 (1978-12-01), Monbaliu et al.

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