| 摘要 |
Photographic element comprises a support bearing a silver halide emulsion layer having associated therewith a micro-precipitated dispersion of a high dye-yield coupler having the formula: COUP-(T) m -L-DYE where COUP is the coupler moiety of the coupler capable of reacting at the coupling position with oxidized color developer to form a first dye, T is one or more timing groups with m = 0, 1 or 2, L is a linking group selected from the group consisting of -OC(O)-, -OC(S)-, -SC(O)-, -SC(S)-, or -OC(=NSO 2 R)-, where R is a substituted or unsubstituted alkyl or aryl group, and DYE is a second dye or precursor thereof comprising an electrically neutral chromophore. The dispersion is preferably formed by (1) dissolving the coupler in n-propanol, (2) adding aqueous NaOH and then a surfactant, and (3) adding an acid to cause microprecipitation of the coupler. The photographic element, provide improved reactivity and photographic properties.
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