Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2000-07-25
2002-02-19
Chea, Thorl (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S576000, C430S577000, C430S578000, C430S580000, C430S583000, C430S585000
Reexamination Certificate
active
06348307
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide photographic light-sensitive material which exhibits a high sensitivity and less residual color.
BACKGROUND OF THE INVENTION
A great deal of effort has been heretofore made to enhance the sensitivity of silver halide photographic light-sensitive materials and minimize residual color after processing.
It is known that a sensitizing dye for use in spectral sensitization has a great effect on the capacities of silver halide photographic light-sensitive materials. Even a small difference in structure between sensitizing dyes has a great effect on photographic capacities such as sensitivity, fogging, storage stability and residual color. However, it is difficult to forecast the effect. Heretofore, many researchers made efforts to synthesize a large number of sensitizing dyes and examine their photographic capacities.
A high aspect ratio tabular silver halide grain (hereinafter referred to as “tabular grain”) as disclosed in U.S. Pat. No. 5,494,789 exhibits a great ratio of surface area to volume as one of photographic properties and thus can adsorb a large amount of a sensitizing dye on the surface thereof. As a result, an even higher spectral sensitivity can be obtained.
The term “aspect ratio” as used herein is meant to indicate the ratio of diameter to thickness of tabular grain. The term “diameter of tabular grain” as used herein is meant to indicate the diameter of the circle having the same area as the projected area of the tabular grain as observed under a microscope or electron microscope. The thickness of tabular grain is represented by the distance between the two parallel planes constituting the tabular grain.
Thus, a tabular grain is favorable for providing a high spectral sensitivity. However, a tabular grain is also disadvantageous in that since it adsorbs a large amount of a sensitizing dye, it increases residual color after processing. It has been desired to solve this problem.
For the above reason, a sensitizing dye which provides a high sensitivity and exhibits less residual color has been desired.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a silver halide photographic light-sensitive material which exhibits a high sensitivity and less residual color.
As a result of extensive studies, the foregoing object of the present invention was accomplished by the following aspects (1) to (5) of the present invention:
(1) A silver halide photographic light-sensitive material comprising at least one compound represented by the following general formula (I):
wherein dye
1
represents a methine dye; M
1
represents a charge-balanced counter ion; m
1
represents the number of M
1
required to neutralize the charge of the molecule; q and p each represents an integer of 1 or more; R
1
represents an alkyl group represented by R
1a
, R
1b
, R
1c
or R
1d
:
R
1a
: (Qa)rCON
−
SO
2
Ra
R
1b
: (Qb)sSO
2
N
−
CORb
R
1c
: (Qc)tCON
−
CORc
R
1d
: (Qd)uSO
2
N
−
SO
2
Rd
wherein Ra, Rb, Rc and Rd each represents an alkyl group, aryl group, heterocyclic group, alkoxyl group, aryloxy group, heterocyclyloxy group or amino group; Qa, Qb, Qc or Qd each represents a methylene group; and r, s, t and u each represents an integer of 1 or more; and R2 represents an alkyl group represented by the following general formula:
R
2a
: A
1
—SO
3
−
R
2b
: A
2—X
wherein A
1
represents a connecting group containing at least one atom other than carbon atom; A
2
represents a connecting group; and X represents a carboxyl group, sulfate group, phosphoric acid group or boric acid group. (2) The silver halide photographic light-sensitive material according to aspect (1), wherein A
2
in R
2
represents a connecting group containing at least one atom other than carbon atom. (3) The silver halide photographic light-sensitive material according to aspect (1), wherein the compound represented by the general formula (I) is represented by the following general formula (X):
wherein L
11
, L
12
, L
13
, L
14
, L
15
, L
16
and L
17
each represents a methine group; P
11
, and P
12
each represents 0 or 1; n
11
represents 0, 1, 2 or 3; Z
11
and Z
12
each represents an atomic group required to form a 5- or 6-membered nitrogen-containing heterocyclic group, with the proviso that the heterocyclic group may be condensed with aromatic rings; M
11
represents a charge-balanced counter ion; m
11
represents a number of from 0 to 4 required to neutralize the charge of the molecule; R
11
has the same meaning as R
1
; and R
12
has the same meaning as R
2
.
(4) The silver halide photographic light-sensitive material according to aspect (3), wherein A
2
in R
12
represents a connecting group containing at least one atom other than carbon atom.
(5) A silver halide photographic light-sensitive material containing at least one of the compounds represented by the general formula (I) or (X) described in aspects (1) to (4) wherein the silver halide emulsion forming the emulsion layer containing the compound comprises silver halide grains having an aspect ratio of from not less than 3 to not more than 100 in a proportion of 50% or more based on the total projected area of the silver halide grains.
DETAILED DESCRIPTION OF THE INVENTION
The compounds represented by the general formula (I) or (X) used in the present invention will be further described hereinafter.
As the methine dye represented by dye
1
there may be used any compound known as such. Preferred examples of such a compound include cyanine dye, merocyanine dye, rhodacyanine dye, oxonol dye, trinuclear merocyanine dye, tetranuclear merocyanine dye, allopolar dye, styryl dye, styrylbase dye, hemicyanine dye, streptocyanine dye, and hemioxonol dye. Preferred among these dyes are cyanine dye, merocyanine dye, trinuclear merocyanine dye, and rhodacyanine dye. Even more desirable among these dyes are cyanine dye, merocyanine dye, and rhodacyanine dye. Particularly preferred among these dyes is cyanine dye. For the details of these dyes, reference can be made to F. M. Harmer, “Heterocyclic Compounds-Cyan Dyes and Related Compounds”, John Wiley & Sons, New York, London, (1964), and D. M. Sturmer, “Heterocyclic Compounds-Special Topics in Heterocyclic Chemistry”, Chapter 18, Section 14, Clauses 482-515.
Among the preferred methine dyes, the trinuclear merocyanine has one basic nucleus and two acidic nuclei. At least one of three substituents on N-position in each of these nuclei is preferably R
1
while at least another substituent is preferably R
2
. The basic skeleton of the trinuclear merocyanine is preferably one represented by the general formula (I) or (II) disclosed in JP-A-3-171135 (The term “JP-A” as used herein means an “unexamined published Japanese patent application”) or the general formula (I) disclosed in JP-A-7-159920.
More preferably, the compound represented by the general formula (I) is one represented by the foregoing general formula (X) or the following general formula (XI) or (XII):
In the general formula (XI), L
18
, L
19
, L
20
and L
21
, each represents a methine group. The suffix P
13
represents 0 or 1. The suffix n
12
represents 0, 1, 2 or 3. Z
13
and Z
14
each represents an atomic group required to form a 5- or 6-membered nitrogen-containing heterocyclic group. M
12
represents a charge-balanced counter ion. The suffix m
12
represents a number of from 0 to 4 required to neutralize the charge of the molecule. One of R
13
and R
14
has the same meaning as R
1
and the other has the same meaning as R
2
.
In the general formula (XII), L
22
, L
23
, L
24
, L
25
, L
26
, L
27
, L
28
, L
29
and L
30
each represents a methine group. The suffix P
14
represents 0 or 1. The suffixes n
13
and n
14
each represents 0, 1, 2 or 3. Z
15
, Z
16
and Z
17
each represents an atomic group required to form a 5- or 6-membered nitrogen-containing heterocyclic group, with the proviso that Z
15
and Z
17
may each be condensed with aromatic rings. M
13
represents a charge-balanced counter ion. The suffix m
13
represents a number of fro
Chea Thorl
Fuji Photo Film Co. , Ltd.
Sughrue & Mion, PLLC
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