Silver halide photographic material

Claim 2

A silver halide photographic material comprising on its base at least one photosensitive emulsion layer containing silver halide emulsion of a surface latent image type that contains silver halide grains of silver chloride or silver chlorobromide made up of 90 mol% or more of silver chloride substantially free from silver iodide, said silver halide grains being ones that comprise iron ions in an amount of 10⁻⁷ to 10⁻³ mol per mol of the silver halide, and a localized phase wherein the concentration of said iron ions is ten times or more that of the other part in the surface layer of the silver halide grain that amounts to 50 % or less of the grain volume.

Claim 3

The silver halide photographic material as claimed in claim 1, wherein the silver chloride content in the silver halide grains is 95 mol% or more.

Claim 4

The silver halide photographic material as claimed in claim 1, wherein the silver iodide content in the silver halide grains is 0.5 mol% or less.

Claim 5

The silver halide photographic material as claimed in claim 1, wherein silver bromide is present in the form of silver bromide localized phases having silver bromide content of 10 to 70 mol% within or on the surface of silver halide grains.

Claim 6

The silver halide photographic material as claimed in claim 1, wherein iron ions is incorporated into the silver halide emulsion grains by adding an iron compound in the step of forming the silver halide emulsion grain.

Claim 7

The silver halide photographic material as claimed in claim 5, wherein the iron compound is water-­soluble.

Claim 8

The silver halide photographic material as claimed in claim 5, wherein the iron compound is selected from the group consisting of ferrous arsenate, ferrous bromide, ferrous carbonate, ferrous chloride, ferrous citrate, ferrous fluoride, ferrous formate, ferrous gluconate, ferrous hydroxide, ferrous iodide, ferrous lactate, ferrous oxalate, ferrous phosphate, ferrous succinate, ferrous sulfate, ferrous thiocyanate, ferrous nitrate, ferrous ammonium nitrate, basic ferric acetate, ferric albuminate, ferric ammonium acetate, ferric bromide, ferric chloride, ferric chromate, ferric citrate, ferric fluoride, ferric formate, ferric glycerophosphate, ferric hydroxide, acidic ferric phosphate, ferric nitrate, ferric phosphate, ferric pyrophosphate, sodium ferric pyrophosphate, ferric thiocyanate, ferric sulfate, ammonium ferric sulfate, guanidium ferric sulfate, ammonium ferric citrate, potassium hexacyanoferrate(II), potassium pentacyanoammineferrate(II), sodium iron(III) ethylenedinitrilotetraacetic acetate, potassium hexacyanoferrate(III), iron(III) tris(pipyridyl) chloride, and potassium pentacyanonitrosylferrate(III).

Claim 9

The silver halide photographic material as claimed in claim 5, wherein the iron compound is selected from the group consisting of hexacyanoferrates(II), hexacyanoferrates(III), ferrous thiocyanate, and ferric thiocyanate.

Claim 10

The silver halide photographic material as claimed in claim 1, wherein the iron ions content in the silver halide grains is 1 x 10⁻⁶ to 1 x 10⁻⁴ mol per mol of silver halide.

Claim 11

The silver halide photographic material as claimed in claim 1, wherein the iron ions localized phase is present in the surface layer of the silver halide grain that amounts to 40 % or less the grain volume.

Claim 12

The silver halide photographic material as claimed in claim 1, wherein the concentration of iron ions in the iron ions localized phase is 50 times or more that of the other part.