Trithiocarbonates as sensitizers for silver halide emulsions
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn Howard Bigelow
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Abstract
Photographic colloid-silver halide emulsions are chemically sensitized by the addition prior to or during digestion of at least one trithiocarbonate compound of the general formula: ##STR1## wherein R is a tertiary alkyl radical having from 4 to 16 carbon atoms and R' may be the same as R or an aryl or an alphyl radical containing 1 to 3 aryl groups which may be substituted or unsubstituted.
Claims7
A photographic element comprising a support bearing at least one layer of a photographic silver halide emulsion which is chemically sensitized by the addition thereto prior to or during digestion of at least one trithiocarbonate of the general formula:
- ##STR9## wherein R is a tertiary alkyl radical having from 4 to 16 carbon atoms, and wherein R' is R or an aryl or an alphyl radical containing 1 to 3 phenyl groups.
Dependencies are inferred from the claim text.