Abstract It has been discovered that when polyalkylene oxide compounds or block polymeric or block oligomeric surface active compounds comprising at least a polyoxypropylene (POP) block and a polyoxyethylene (POE) block are added to conventional dispersions of yellow couplers (that is dispersions in which the dispersed particles have a particle size of 0.1 to 0.6 μm), such dispersions in a coated silver halide photographic element produce substantially higher dye yield compared to the conventional dispersion without any additive. Further, the yellow dye formed from such dispersions containing the addenda of this invention are substantially more light stable compared to dispersions that does not contain such addenda. The invention is carried out just by adding required amounts of the said polyoxyethylene (POE)--polyoxypropylene (POP) compound to a preformed milled coupler dispersion prior to coating the photographic element.
A method of preparing a blue sensitive layer in a silver halide photographic light sensitive element, which method comprises: (i) forming a dispersion comprising dispersed particles in an aqueous medium containing a hydrophilic colloid, the particles having a particle size of 0.1 to 0.6 μm and comprising a yellow image-dye forming coupler having the formula: ##STR49## wherein R 1 is substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted anilino or substituted or unsubstituted heterocyclic; Ar is substituted or unsubstituted aryl; and X is hydrogen or a coupling-off group; (ii) adding a polyoxyalkylene polymer to the dispersion formed in step (i) in an amount of about 0.1 to about 0.6 gram, per gram of the yellow coupler in the dispersion; (iii) mixing the dispersion with a silver halide emulsion; and (iv) applying the resulting composition formed in step (iii) onto a support to form a layer.
Claim 2
Independent Claim
148 words
A method of preparing a blue sensitive layer in a silver halide photographic light sensitive element, which method comprises: (i) forming a dispersion comprising dispersed particles in an aqueous medium containing a hydrophilic colloid, the particles having a particle size of 0.1 to 0.6 μm and comprising a yellow image-dye forming coupler having the formula: ##STR49## wherein R 1 is substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted anilino or substituted or unsubstituted heterocyclic; Ar is substituted or unsubstituted aryl; and X is hydrogen or a coupling-off group; (ii) adding a polyoxyalkylene polymer to the dispersion formed in step (i) in an amount of about 0.1 to about 0.6 gram, per gram of the yellow coupler in the dispersion; (iii) mixing the dispersion with a silver halide emulsion; and (iv) applying the resulting composition formed in step (iii) onto a support to form a layer.
Claim 3
Dependent Claim
28 words
The method of claim 1, wherein the polyoxyalkylene polymer is added in the the amount of from about 0.1 to about 0.3 gram per gram of yellow coupler.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein the polyoxyalkylene polymer is a polyoxyethylene-polyoxypropylene block polymer.
Claim 5
Dependent Claim
28 words
The method of claim 3, wherein the polyoxyethylene-polyoxypropylene block polymer is added in the amount of from about 0.1 to about 0.3 gram per gram of yellow coupler.