Silver halide photographic emulsion
AssigneeFuji Photo Film Co., Ltd.
InventorAkikazu Mikawa
Life of this patent
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Abstract
A silver halide photographic emulsion, whose sensitivity is enhanced without fogging, containing at least one organic thioether compound and at least one compound represented by the formulae (I), (II) and/or (III): Z--SO.sub.2 --S--M (I) ##STR1## wherein Z is an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms or a heterocyclic group; Y represents the atoms necessary for forming an aromatic ring having 6 to 18 carbon atoms or a heterocyclic ring; M is a metal atom or an organic cation; and n is an integer of 2 to 10.
Claims12
A silver halide photographic emulsion containing at least one organic thioether compound in an amount sufficient for sensitizing, wherein said organic thioether compound is represented by formulae (C) to (H):
- HO--R.sup.2 --S--R.sup.4).sub.r' S--R.sup.2 --OH (C)
- (HO--R.sup.2 --S--R.sup.2 --O--R.sup.4).sub.2 (D) ##STR10##
- (R.sup.3 --O--R.sup.2 --S--R.sup.2).sub.2 S (F) ##STR11## wherein r' is an integer of 0 to 3;
- m' is an integer of 1 or 2;
- R.sup.2 and R.sup.4 each is an alkylene group having 1 to 5 carbon atoms and R.sup.3 is an alkyl group having 1 to 5 carbon atoms and at least one compound represented by the formulae (I), (II) and/or (III):
- Z--SO.sub.2 --S--M (I) ##STR12## wherein Z is an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms or a heterocyclic group;
- Y represents the atoms necessary for forming an aromatic ring having 6 to 18 carbon atoms or a heterocyclic ring;
- M is a metal ion or an organic cation;
- and n is an integer of 2 to 10, said silver halide exhibiting enhanced sensitivity without increased fogging.
Dependencies are inferred from the claim text.