Photographic products and processes with a pH sensitive xanthene light screening dye
AssigneePolaroid Corporation
InventorsRichard L. Cournoyer, James W. Foley
Life of this patent
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Abstract
The present invention is concerned with photographic products and processes employing certain pH-sensitive xanthene compounds as light-screening dyes, which compounds may be represented by the formulae ##STR1## wherein A and A', the same or different, are selected from ##STR2## each R is hydrogen or an electron-withdrawing group; each R.sup.1 is hydrogen or alkyl; each R.sup.2 is hydrogen, alkyl or an electron-withdrawing group; R.sup.3 is hydrogen or alkyl; R.sup.4 is alkyl; and n is 0 or 1 and which compounds in their colored, i.e., ring-opened form may be represented by the formulae ##STR3## wherein A, A', R.sup.3, R.sup.4 and n have the same meaning given above and Z is an anion.
Claims66
A photographic product comprising a plurality of layers including a support and at least one photosensitive silver halide emulsion layer carried on said support, at least one of said layers containing a colored xanthene compound selected from those having the formulae ##STR47## wherein A and A', the same or different, are selected from ##STR48## each R is hydrogen or an electron-withdrawing group;
- each R.sup.1 is hydrogen or alkyl;
- each R.sup.2 is hydrogen, alkyl or an electron-withdrawing group;
- R.sup.3 is hydrogen or alkyl;
- R.sup.4 is alkyl;
- n is 0 or 1;
- and Z is an anion.
A photographic product for forming a multicolor diffusion transfer image, said product comprising a first sheet-like element comprising a first support carrying a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, and a blue-sensitive silver halide emulsion layer, said silver halide emulsion layers having associated therewith, respectively, a cyan image dye-providing material, a magenta image dye-providing material and a yellow image dye-providing material;
- a second sheet-like element comprising a second support;
- said first and second sheet-like elements being in superposed relationship, or adapted to be brought into superposed relationship, with said supports being outermost;
- at least one of said supports being transparent to permit photoexposure of said silver halide emulsions therethrough;
- a rupturable container releasably holding an aqueous alkaline processing composition, said rupturable container being so positioned as to be capable of discharging said processing composition between a pair of predetermined layers carried by said supports;
- an image-receiving layer carried by one of said supports;
- and a colored xanthene compound being disposed in a processing composition permeable layer carried by one of said supports, said xanthene compound selected from those having the formulae ##STR52## wherein A and A', the same or different, are selected from ##STR53## each R is hydrogen or an electron-withdrawing group;
- each R.sup.1 is hydrogen or alkyl;
- each R.sup.2 is hydrogen, alkyl or an electron-withdrawing group;
- R.sup.3 is hydrogen or alkyl;
- R.sup.4 is alkyl;
- n is 0 or 1;
- and Z is an anion.
A photographic process which comprises the steps of exposing a photosensitive film comprising a plurality of layers including at least one photosensitive silver halide emulsion layer carried on a support, at least one of said layers containing a colored xanthene compound having the formulae ##STR57## wherein A and A', the same or different, are selected from ##STR58## each R is hydrogen or an electron-withdrawing group;
- each R.sup.1 is hydrogen or alkyl;
- each R.sup.2 is hydrogen, alkyl or an electron-withdrawing group;
- R.sup.3 is hydrogen or alkyl;
- R.sup.4 is alkyl;
- n is 0 or 1 and Z is an anion and contacting said photosensitive silver halide emulsion layer(s) with an aqueous alkaline processing composition having an alkaline pH to effect development.
A photographic process which comprises, in combination, the steps of:
- (a) exposing a photosensitive film unit comprising a plurality of layers including a support carrying at least one photosensitive silver halide emulsion layer having associated therewith an image-providing material, an image-receiving layer adapted to receive a solubilized image-providing material diffusing thereto, at least one of said layers on the same side of said support as said silver halide layer(s) containing a colored xanthene compound selected from those having the formulae ##STR59## wherein A and A', the same or different, are selected from ##STR60## each R is hydrogen or an electron-withdrawing group;
- each R.sup.1 is hydrogen or alkyl;
- each R.sup.2 is hydrogen, alkyl or an electron-withdrawing group;
- R.sup.3 is hydrogen or alkyl;
- R.sup.4 is alkyl;
- n is 0 or 1;
- and Z is an anion;
- (b) contacting said silver halide layer(s) and said colored compound with a processing composition having an alkaline pH;
- (c) effecting thereby development of said silver halide layer(s), contacting with said alkaline processing composition also being effective to convert said colored compound to its colorless form;
- (d) forming as a result of said development, an imagewise distribution of diffusible image-providing material;
- and
- (e) transferring, by diffusion, at least a portion of said imagewise distribution of diffusible image-providing material to said layer adapted to receive said material to provide a transfer image thereto.
A photographic process for forming a multicolor diffusion transfer image which comprises the steps of:
- (a) exposing a photosensitive film unit which includes, in combination, a first sheet-like element comprising a first support carrying a red-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, and a blue-sensitive silver halide emulsion layer, said silver halide emulsion layers having associated therewith, respectively, a cyan image dye-providing material, a magenta image dye-providing material and a yellow image dye-providing material;
- a second sheet-like element comprising a second support;
- said first and second sheet-like elements being in superposed relationship, or adapted to be brought into superposed relationship, with said supports being outermost;
- at least one of said supports being transparent to permit photoexposure of said silver halide emulsions therethrough;
- a rupturable container releasably holding an aqueous alkaline processing composition, said rupturable container being so positioned as to be capable of discharging said processing composition between a pair of predetermined layers carried by said supports;
- an image-receiving layer carried by one of said supports;
- and a colored compound disposed in a processing composition permeable layer carried by one of said supports, said colored compound being a xanthene compound having the formulae ##STR64## wherein A and A', the same or different, are selected from ##STR65## each R is hydrogen or an electron-withdrawing group;
- each R.sup.1 is hydrogen or alkyl;
- each R.sup.2 is hydrogen, alkyl or an electron-withdrawing group;
- R.sup.3 is hydrogen or alkyl;
- R.sup.4 is alkyl;
- n is 0 or 1;
- and Z is an anion;
- (b) contacting said silver halide layer(s) and said colored compound with a processing composition having an alkaline pH;
- (c) effecting thereby development of said silver halide layer(s), said contacting with said alkaline processing composition also being effective to convert said colored compound to its colorless form;
- (d) forming as a result of said development, an imagewise distribution of diffusible image dye-providing material;
- and
- (e) transferring, by diffusion, at least a portion of said imagewise distribution of diffusible image dye-providing material to said image-receiving layer to provide a transfer image thereto.
Dependencies are inferred from the claim text.