Silver halide photographic emulsion, a silver halide photographic light-sensitive material and a method for processing the same

• US 5,541,047 A
• Filed: 12/12/1994
• Issued: 07/30/1996
• Est. Priority Date: 12/16/1993
• Status: Expired due to Fees

• Current Assignee: Konica Corporation (Konica Minolta Inc.)
• Original Assignee: Konica Corporation (Konica Minolta Inc.)
• Inventors: Kashiwagi, Hiroshi, Takiguchi, Hideki
• Primary Examiner(s): Wright, Lee C.
• Application Number:
  US08/354,420
• Time in Patent Office: 596 Days
• Field of Search: 430/567, 430/569, 430/585, 430/572, 430/574, 430/522, 430/603, 430/599
• US Class Current: 430/522
• CPC Class Codes: G03C 1/0051 Tabular grain emulsions
• CPC Class Codes: G03C 1/08 Sensitivity-increasing substances
• CPC Class Codes: G03C 1/09 Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising G03C1/34, G03C1/35 take precedence
• CPC Class Codes: G03C 1/10 Organic substances G03C1/061, G03C1/067 take precedence
• CPC Class Codes: G03C 1/18 with three CH groups
• CPC Class Codes: G03C 1/29 the supersensitising mixture being solely composed of dyes ; Combination of dyes, even if the supersensitising effect is not explicitly disclosed
• CPC Class Codes: G03C 1/832 Methine or polymethine dyes
• CPC Class Codes: G03C 2001/0055 Aspect ratio of tabular grains in general; High aspect ratio; Intermediate aspect ratio; Low aspect ratio
• CPC Class Codes: G03C 2001/0058 Twinned crystal
• CPC Class Codes: G03C 2001/0156 pAg value; pBr value; pCl value; pI value
• CPC Class Codes: G03C 2001/03535 Core-shell grains
• CPC Class Codes: G03C 2001/03558 Iodide content
• CPC Class Codes: G03C 2001/097 Selenium
• CPC Class Codes: G03C 2001/098 Tellurium
• CPC Class Codes: G03C 2001/7448 Dispersion
• CPC Class Codes: G03C 5/16 X-ray, infrared, or ultraviolet ray processes

Abstract

A silver halide photographic light-sensitive material is disclosed, comprising tabular grains having an average aspect ratio of diameter to thickness of 2 or more, having an average overall iodide content of 2 mol % or less, and having a surface phase containing 3 to 20 mol % iodide on the average. The emulsion is spectrally sensitized by adding a sensitizing dye represented by the following formula [I] or [II], ##STR1##

Claims

1. A silver halide photographic light-sensitive material comprising a support having provided thereon hydrophilic colloid layers including a silver halide emulsion layer containing a silver halide emulsion, wherein said silver halide emulsion comprises tabular grains having an average aspect ratio of diameter to thickness of 2 or more, containing, on average, 2 mol % or less iodide, said grains having a surface phase containing, on average, 3 to 20 mol % iodide;

said emulsion being spectrally sensitized by adding a sensitizing dye represented by the following Formula [I] or [II] in the form of solid particles dispersed in an aqueous medium substantially free from organic solvent and surfactant;

##STR133## wherein R₁ and R₃ independently represent a substituted or unsubstituted alkyl group;

R₂ and R₄ independently represents an lower alkyl group, provided that at least one of R₂ and R₄ is an alkyl group substituted by a hydrophilic group;

V₁, V₂, V₃ and V₄ independently represent a hydrogen atom or a substituent, provided that the sum of Hammett'"'"'s σ

p values of V₁, V₂, V₃ and V₄ is not more than 1.7;

X₁ represents an ion; and

n is 1 or 2, ##STR134## wherein R₅ an R₆ independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group or a substituted or unsubstituted aryl group, provided that at least one of R₅ and R₆ is a sulfoalkyl or carboxyalkyl group;

R₇ represents a hydrogen atom, an alkyl group or an aryl group;

Z₁ and Z₂ represent non-metal atomic group necessary or forming a benzene or naphthalene ring, which may be substituted;

X₂ represents an ion; and

m is 1 or 2.

2. The photographic material of claim 1, wherein said silver halide emulsion is spectrally sensitized by adding both a sensitizing dye of formula [I] and sensitizing dye of formula [II].

3. The photographic material of claim 1, wherein said emulsion is chemically sensitized by adding thereto at least one of a selenium compound, a tellurium compound and a reductive compound.

4. The photographic material of claim 1, wherein said silver halide grains have two or more parallel twin planes in the grain, said grains having a (b/a) ratio of 5 or more and accounting for 50% or more of total grains by number, in which (a) is the longest distance between two or more parallel twin planes and (b) is the grain thickness.

5. The photographic material of claim 1, wherein at least one of the hydrophilic colloid layers contains a dye represented by the following formulas [1] through [6], ##STR135## wherein A and A'"'"' independently represent an acidic nucleus;

B represents a basic nucleus;

Q represents an aryl group or a heterocyclic group;

Q'"'"' represents a heterocyclic group;

X and Y independently represent an electron-attractive group;

L₁, L₂ and L₃ represent a methine group;

m is 0 or 1;

n is 0, 1 or 2;

p is 0 or 1, provided that each of the dyes of formulas [1] through [6] has at least one selected from a carboxy group, a sulfonamide group and a sulfamoyl group.

6. The photographic material of claim 5, wherein said dye is in the form of a dispersion of solid particles dispersed in a binder.

7. A silver halide photographic light-sensitive material comprising a support having thereon hydrophilic colloid layers including a silver halide emulsion layer comprising silver halide emulsion, wherein said silver halide emulsion comprises tabular grains having an average aspect ratio of diameter to thickness of 2 or more, containing 2 mol % or less iodide on the average, and having a surface silver halide phase containing 3 to 20 mol % iodide on the average;

said emulsion is chemically sensitized by adding thereto at least one of a selenium compound, a tellurium compound and a reductive compound; and

said emulsion is spectrally sensitized by adding a sensitizing dye represented by the following formula [I] or [II] in the form of solid particles dispersed in an aqueous medium substantially free from an organic solvent and a surfactant, ##STR136## wherein R₁ and R₃ independently represent a substituted or unsubstituted alkyl group;

R₂ and R₄ independently represents an lower alkyl group, provided that at least one of R₂ and R₄ is an alkyl group substituted by a hydrophilic group;

V₁, V₂, V₃ and V₄ independently represent a hydrogen atom or a substituent, provided that the sum of Hammett'"'"'s σ

p values of V₁, V₂, V₃ and V₄ is not more than 1.7;

X₁ represents an ion; and

n is 1 or 2, ##STR137## wherein R₅ and R₆ independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group or a substituted or unsubstituted aryl group, provided that at least one of R₅ and R₆ is a sulfoalkyl or carboxyalkyl group;

R₇ represents a hydrogen atom, an alkyl group or an aryl group;

Z₁ and Z₂ represent non-metal atomic group necessary for forming a benzene or naphthalene ring, which may be substituted;

X₂ represents an ion; and

m is 1 or 2.