Photographic material and process comprising a bicyclic pyrazolo coupler
AssigneeEastman Kodak Company
InventorsPing Wah Tang, Stanley W. Cowan
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Abstract
Novel bicyclic pyrazolo couplers containing a ballast group of formula (I): ##STR1## are useful in photographic materials and processes. The couplers exhibit increased coupling activity, and provide formation of dyes having improved maximum magenta image dye density, contrast, and development speed when employed in color photographic materials and processes.
Claims7
A photographic element comprising a support bearing at least one photographic silver halide emulsion layer and having associated therewith a dye-forming bicyclic pyrazolo-based coupler, wherein the coupler contains a ballast group which is linked to the bicyclic ring by a substituted carbon, the coupler being represented by Formula (II):
- ##STR18## wherein:
- R is selected from the group consisting of t-butyl, t-octyl, t-pentyl, and adamantyl;
- X is hydrogen or halogen;
- Z.sup.a, Z.sup.b and Z.sup.c are independently selected from the group consisting of a substituted or unsubstituted methine group, .dbd.N--, .dbd.C-- or --NH--, provided that one of either the Z.sup.a -Z.sup.b bond or the Z.sup.b -Z.sup.c bond is a double bond and the other is a single bond, and when the Z.sup.b -Z.sup.c bond is a carbon-carbon double bond, it may form part of an aromatic ring, and wherein at least one of Z.sup.a, Z.sup.b and Z.sup.c represents a methine group connected with the ballast;
- R.sup.1 to R.sup.6 are independently hydrogen or a substituent and R.sup.7 is a substituent, with the proviso that R.sup.1 and R.sup.2 do not simultaneously represent hydrogen;
- m is 0 to 5, n is 0 or 1, p is 0 to 4;
- L is a divalent linking group connecting the BD group to the phenylene ring;
- B is --N(R.sup.8)SO.sub.2 --where R.sup.8 is a hydrogen atom or a substituent;
- and
- D is a substituted or unsubstituted alkyl group.
Dependencies are inferred from the claim text.