Silver halide photographic emulsions for use in flash exposure

Claim 1

A silver halide photographic emulsion for use in flash exposure which comprises at least one compound containing a metal belong to Group VIII of the periodic table in an amount of 10 -8 to 5×10 -7 mole per mole of silver halide and at least one of sensitizing dyes represented by the formula (I) or (II) and capable of sensitizing silver halide at less than 550 nm; ##STR7## wherein R is selected from the group consisting of alkyl, allyl, aryl, substituted alkyl selected from the group consisting of β-sulfoethyl, γ-sulfopropyl, δ-sulfobutyl, γ-sulfobutyl, β-(γ-sulfopropoxy)ethyl, β-(δ-sulfothiobutoxy)ethyl, β-hydroxyethyl, β-hydroxy-γ-sulfopropyl, carboxymethyl and β-carboxyethyl, and substituted aryl selected from the group consisting of p-chlorophenyl and p-carboxyphenyl; Z represents a non-metallic group necessary to complete a nitrogen-containing heterocyclic ring selected from the group consisting of pyrroline, thiazoline, thiazole, benzothiazole, naphthothiazole, selenazole, benzoselenazole, naphthoselenazole, oxazole, benzoxazole, naphthoxazole, imidazole, benzoimidazole, pyridine, quinoline, and indole; Q represents a non-metallic group necessary to complete a rhodanine, thiohydantoin or thiooxazolidine-dione ring which may be substituted by a group selected from the group consisting of lower alkyl, lower alkoxy, sulfoalkyl, carboxyalkyl, hydroxyalkyl, allyl and aryl; and n represents an integer of 1 or 2; ##STR8## wherein R 1 and R 2 individually are selected from the group consisting of alkyl, allyl, aryl, substituted alkyl selected from the group consisting of β-sulfoethyl, γ-sulfopropyl, δ-sulfobutyl, γ-sulfobutyl, β-(γ-sulfopropoxy)ethyl, β-(δ-sulfothiobutoxy)ethyl, β-hydroxyethyl, β-hydroxy-γ-sulfopropyl, carboxymethyl and β-carboxyethyl, and substituted aryl being selected from the group consisting of p-chlorophenyl and p-carboxyphenyl; Z 1 and Z 2 individually represent a non-metallic group necessary to complete a pyridine, pyrroline, oxazole, thiazole or selenazole ring; X - represents an anion; and n 1 , n 2 and n 3 individually represent an integer of 1 or 2; provided that n 3 is 1 when a sensitizing dye of the general formula forms an inner salt.