Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1973-08-27
1976-03-16
Daus, Donald G.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
26032614R, 2603432R, C07D30777
Patent
active
039445690
ABSTRACT:
This invention relates to a class of phthalein indicator dyes useful as optical filter agents in photographic processes to protect a selectively exposed photosensitive material from further exposure during processing in the presence of incident light. Such dyes comprise 3,3-disubstituted phthalides and 3,3-disubstituted naphthalides wherein the 3,3 substituents are p-hydroxy carbocyclic aryl radicals wherein one or both of the radicals possess a --CH.sub.2 --NRR' group ortho to the p-hydroxy group and the --CH.sub.2 --NRR' group(s) is capable of rendering the indicator dye substantially non-diffusible in aqueous solution.
REFERENCES:
patent: 499927 (1893-06-01), Monnet
patent: 3301870 (1967-01-01), Terzijska et al.
Bloom Stanley M.
Idelson Elbert M.
Simon Myron S.
Waller David P.
Campell Sybil A.
Daus Donald G.
Polaroid Corporation
Tighe Anne Marie T.
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