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Blocked pyrazolone magenta dye-forming couplers |
| T101004 |
Blocked pyrazolone magenta dye-forming couplers
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| Inventor: |
Gompf, et al. |
| Date Issued: |
September 1, 1981 |
| Application: |
06/220,579 |
| Filed: |
December 29, 1980 |
| Inventors: |
Gompf; Thomas E. (Rochester, NY)
Hammond; Howell A. (Rochester, NY)
Mooberry; Jared B. (Rochester, NY)
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| U.S. Class: |
430/557; 430/558; 548/366.1 |
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| Abstract: |
Novel 5-pyrazolone magenta dye-forming couplers are blocked with a coupler moiety which yields an alkali-soluble or colorless reaction product. The coupler moiety is joined via its coupling position to the enol oxygen of the 5-pyrazolone and is displaced therefrom during processing as a result of reaction by means of oxidized color developing agent to thereby activate the 5-pyrazolone coupler. These couplers have good reactivity and good resistance to aerial contaminants, such as formaldehyde, and can be incorporated in photographic emulsions and elements. |
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