Ultrathin high chloride tabular grain emulsions
AssigneeEastman Kodak Company
InventorJoe E. Maskasky
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Abstract
A radiation sensitive emulsion is disclosed containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, in which greater than 50 percent of the total grain projected area is accounted for by ultrathin tabular grains containing a 7-azaindole type compound.
Claims13
A radiation sensitive emulsion containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, in which greater than 50 percent of the total grain projected area is accounted for by ultrathin tabular grains having a thickness of less than 360 {111} crystal lattice planes and, adsorbed to the major faces of the ultrathin tabular grains and present in a concentration in excess of that required to provide monomolecular coverage of an area equal to 150 percent of the area of the grain surfaces, a compound of the formula:
- ##STR18## where Z.sup.2 is --C(R.sup.2).dbd. or --N.dbd.;
- Z.sup.3 is --C(R.sup.3).dbd. or --N.dbd.;
- Z.sup.4 is --C(R.sup.4).dbd. or --N.dbd.;
- Z.sup.5 is --C(R.sup.5).dbd. or --N.dbd.;
- Z.sup.6 is --C(R.sup.6).dbd. or --N.dbd.;
- with the proviso that no more than one of Z.sup.4, Z.sup.5 and Z.sup.6 is --N.dbd.;
- R.sup.2 is H, NH.sub.2 or CH.sub.3 ;
- R.sup.3, R.sup.4 and R.sup.5 are independently selected, R.sup.3 and R.sup.5 being hydrogen, hydroxy, halogen, amino or hydrocarbon and R.sup.4 being hydrogen, halogen or hydrocarbon, each hydrocarbon moiety containing from 1 to 7 carbon atoms;
- and
- R.sup.6 is H or NH.sub.2.
A radiation sensitive emulsion containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, in which greater than 50 percent of the total grain projected area is accounted for by ultrathin tabular grains having a thickness of less than 360 {111} crystal lattice planes and, adsorbed to the major faces of the ultrathin tabular grains and present in a concentration of from 20 to 200 millimoles per silver mole, a compound of the formula:
- ##STR20## where Z.sup.2 is --C(R.sup.2).dbd. or --N.dbd.;
- Z.sup.3 is --C(R.sup.3).dbd. or --N.dbd.;
- Z.sup.4 is --C(R.sup.4).dbd. or --N.dbd.;
- Z.sup.5 is --C(R.sup.5).dbd. or --N.dbd.;
- Z.sup.6 is --C(R.sup.6).dbd. or --N.dbd.;
- with the proviso that no more than one of Z.sup.4, Z.sup.5 and Z.sup.6 is --N.dbd.;
- R.sup.2 is H, NH.sub.2 or CH.sub.3 ;
- R.sup.3, R.sup.4 and R.sup.5 are independently selected, R.sup.3 and R.sup.5 being hydrogen, hydroxy, halogen, amino or hydrocarbon and R.sup.4 being hydrogen, halogen or hydrocarbon, each hydrocarbon moiety containing from 1 to 7 carbon atoms;
- and
- R.sup.6 is H or NH.sub.2.
Dependencies are inferred from the claim text.