| 摘要 |
The present invention provides a photographic element comprising a support bearing a light-sensitive silver halide emulsion layer in association with an image dye-forming coupler characterised in that there is also associated therewith a compound of general formula <CHEM> wherein R1 is an unsubstituted or substituted alkyl or aryl group or 5-10 membered heterocyclic ring containing one or more heteroatoms selected from N, O and S; each R2 is independently selected from hydrogen, halogen and an unsubstituted or substituted alkyl, aryl, alkyl-or aryl-sulfamoyl, alkyl-or aryl-sulfonamido, alkyl- or aryl-carbamoyl alkyl-or aryl-carbonamido, alkenyloxy group and a 5-10 membered heterocyclic ring containing one or more heteroatoms selected from N, O and S; each Y is selected from the groups consisting of -NHSO2 and -SO2NH; wherein the hydrogen therein has a pKa value of less than 9; n is an integer from 1 to 20; x is an integer from 1 to 6 and wherein the compound of formula (I) is ballasted. The addenda of formula (I) can significantly increase the image dye yield and improve robustness to process pH variation, without adverse effects on coupler or dye stability, dye hue and/or speed, in a simple, cost effective way. |
