Method of manufacturing silver halide photographic emulsions
AssigneeKonica Corporation
InventorShigeo Tanaka
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Abstract
A step manufacturing method of a silver halide photographic emulsion comprising silver halide grains having a silver chloride content of not less than 95 mol % is disclosed, the method comprising the steps of mixing a silver salt and a halide to form a silver halide emulsion and chemically ripening the resulting silver halide emulsion, wherein a compound having two or more sulfonic acid or sulfonic acid salt groups in its molecule is added to the silver halide emulsion at the chemical ripening.
Claims8
A method of manufacturing a silver halide photographic emulsion comprising silver halide grains having a silver chloride content of not less than 95 mol %, the method comprising the steps of:
- mixing a silver salt and a halide to form a silver halide emulsion;
- and
- chemically ripening the resulting silver halide emulsion,
- wherein a compound having two or more sulfonic acid or sulfonic acid salt groups in its molecule is added to the silver halide emulsion at the chemical ripening step, the compound being a condensation compound of napthalene sulfonic acid or naphthalene sulfonic acid salt with formaldehyde or a polymeric compound having a chemical structure represented by the following formula (1):
- ##STR5## wherein R.sub.1 represents a hydrogen atom or an alkyl group;
- X represents --OCO--, CONR'-- or --SO.sub.2 NR'--, in which R' represents a hydrogen atom or an alkyl group;
- R.sub.2 represents an alkyl, aryl or aralkyl group each having a sulfonic acid or sulfonic acid salt group;
- and n represents an integer of 2 or more.
Dependencies are inferred from the claim text.