Aminomethyl-substituted 1-naphthol phthalides and naphthalides
AssigneePolaroid Corporation
InventorsStanley M. Bloom, Elbert M. Idelson, Myron S. Simon, David P. Waller
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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.
Claims21
An indicator dye having the formula ##SPC5##
- wherein A and A' are ##SPC6##
- Y is --CH.sub.2 --NRR' wherein R is hydrogen or acyl having the formula ##EQU2## wherein R'" is alkyl having 1 to 20 carbon atoms, naphthyl, phenyl, phenylalkyl wherein said alkyl contains 1 to 12 carbon atoms and p-alkylphenyl wherein said p-alkyl has 1 to 12 carbon atoms and R' is a hydrocarbon group selected from alkyl having 1 to 20 carbon atoms, naphthyl, phenyl, phenylalkyl wherein said alkyl has 1 to 12 carbon atoms and p-alkylphenyl wherein said p-alkylcontains 1 to 12 carbon atoms;
- Y' is hydrogen or --CH.sub.2 --NRR' the same as Y;
- and X represents the atoms necessary to complete a ring-closing moiety selected from phthalide and naphthalide.
Dependencies are inferred from the claim text.