Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
2001-11-21
2003-04-01
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S384000, C430S385000
Reexamination Certificate
active
06541192
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-356086, filed Nov. 22, 2000, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a silver halide color photographic lightsensitive material which improves the color reproduction and dye image stability, suppresses various stains, and increases the processing stability by using a pyrrolotriazole cyan coupler having a specific structure.
2. Description of the Related Art
It is well known that in silver halide color photographic lightsensitive materials, an aromatic primary amine-based color developing agent oxidized by using an exposed silver halide as an oxidizer reacts with couplers to form dyes such as indophenol, indoaniline, indamine, azomethine, phenoxazine, and phenazine, thereby forming images. This photographic scheme uses subtraction color processes and forms color images by yellow, magenta, and cyan dyes.
To form a cyan dye image, a phenol- or naphthol-based coupler is conventionally used. However, dyes formed from these couplers have unpreferable absorption in regions from yellow to magenta and hence deteriorate the color reproduction. So, solving this problem has been desired.
Especially in recent years, demands on so-called digital photography are increasing by which image information is converted into digital information, image processing is performed, and after that, a silver halide color photographic lightsensitive material is exposed on the basis of the information. In this digital photography, a silver halide color photographic lightsensitive material having a wide color reproduction range, in which formed dyes have no such unpreferable absorption as described above, is desired.
Also, reversal films are desired to have high saturation and a wide color reproduction range. However, a method which emphasizes the interlayer effect has drawbacks such as deterioration of the processing dependency. Therefore, it has been required to realize high saturation and wide color reproduction by couplers superior in hue.
As means for solving this problem, heterocyclic compounds as described in, e.g., U.S. Pat. Nos. 4,728,598 and 4,873,183 and European Patent Publication No. 0249453A2 have been proposed. Unfortunately, these couplers have fatal drawbacks such as low coupling activity and low dye image stability.
As couplers which have solved these problems, pyrrolotriazole couplers described in U.S. Pat. No. 5,256,526 and European Patent 0545300 have been proposed. Although these couplers are superior in hue and coupling activity, color photographic lightsensitive materials using these couplers have no sufficient dye image stability. So, the couplers must be further improved. Also, the couplers have the problem (so-called blix fading) that the color generation reduces by leuco conversion of a dye (a dye is partially decolored by reduction) during bleach-fixing. Additionally, diverse cyan stains are produced. Furthermore, conventionally known pyrrolotriazole cyan couplers produce a magenta stain with time when processed using formalin.
Moreover, in color reversal films, it is desired to shorten processing and to reduce the replenishment rate. The inventors of the present invention have studied these matters, and found that there was a problem that the decrease of cyan maximum density becomes larger in the case of also reducing the replenishment rate of the reversal solution in the reversal bath simultaneously with reducing the replenishment rate of the color developer. Further, this problem often becomes more serious in conventional pyrrolotriazole cyan couplers than in phenol-type cyan couplers conventionally used, thus this problem must be solved.
BRIEF SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a silver halide color photographic lightsensitive material
1) which improves the color reproduction and dye image stability by the use of a novel pyrrolotriazole cyan coupler having a specific structure, which is useful as coupler in a silver halide color photographic lightsensitive material, and
2) which reduces a cyan stain produced by the reaction with a residual color developing agent, causes blix fading little, minimizes a magenta stain, and improves the processing stability.
The present inventors extensively studied 2-position substituents and split-off groups of pyrrolotriazole-based couplers having good hue, and have found that the above problems can be solved by a coupler, represented by the following formula, having an entirely new structure conventionally unknown. That is, the object of the present invention is achieved by the following means.
(1) A silver halide color photographic lightsensitive material comprising at least one layer on a support, wherein the at least one layer contains a coupler represented by formula (I) below.
In formula (I), X represents a member selected from the group consisting of a hydrogen atom, halogen atom, 1- to 32-carbon alkoxy group, 6- to 32-carbon aryloxy group, 1- to 32-carbon alkylthio group, 6- to 32-carbon arylthio group, 2- to 32-carbon heterocyclic thio group, 2- to 32-carbon alkoxycarbonyloxy group, 7- to 32-carbon aryloxycarbonyloxy group, 1- to 32-carbon carbamoyloxy group, 3- to 32-carbon heterocyclic carbonyloxy group, 2- to 30-carbon alkylcarbonyloxy group, 7- to 30-carbon arylcarbonyloxy group, and 2- to 32-carbon, 5- or 6-membered nitrogen-containing heterocyclic group that bonds to the coupling active position with a nitrogen atom.
Each of R
1
and R
2
represents an electron-attracting group having a Hammett's substituent constant &sgr;p value of not less than 0.20, the sum of the &sgr;p values of R
1
and R
2
being not less than 0.65.
R
3
represents a member selected from the group consisting of a substituted or nonsubstituted alkyl group, substituted or nonsubstituted alkenyl group, substituted or nonsubstituted alkynyl group, substituted or nonsubstituted cycloalkyl group, substituted or nonsubstituted cycloalkenyl group, substituted or nonsubstituted aryl group, and substituted or nonsubstituted heterocyclic group; and R
4
represents a member selected from the group consisting of a hydrogen atom, substituted or nonsubstituted alkyl group, substituted or nonsubstituted alkenyl group, substituted or nonsubstituted alkynyl group, substituted or nonsubstituted cycloalkyl group, substituted or nonsubstituted cycloalkenyl group, substituted or nonsubstituted aryl group, substituted or nonsubstituted acyl group, substituted or nonsubstituted alkoxycarbonyl group, substituted or nonsubstituted aryloxycarbonyl group, and substituted or nonsubstituted carbamoyl group. Alternatively, R
3
and R
4
may bond together to form a ring structure.
Each of R
11
to R
15
independently represents a hydrogen atom or a substituent, and at least one of R
11
to R
15
represents —(L
1
)—(L
2
)
n
—R, wherein L
1
represents —CONH—, —NHCONH—, —NHCOO—, —NHCO—, —OCONH—, —NH—, —NR
X
—, —COO—, —OCO—, —CO—, —O—, —S—, —SO
2
—, —NHSO
2
—, —SO
2
NH—, or —CH
2
— (wherein the left side of each group binds to the benzene ring of formula (I)), L
2
represents —CH
2
CH
2
O— or —CH
2
CONH— (wherein the left side of each group binds to L
1
).
R represents an 8- to 40-carbon, branched-chain or straight-chain, nonsubstituted alkyl group. R
X
represents an alkyl group.
n represents 0, when L
1
is a group other than —O—; n represents 1, when L
1
is —O— and L
2
is —CH
2
CONH—; and n represents an integer from 0 to 10, when L
1
is —O— and L
2
is —CH
2
CH
2
O—.
Two or more groups of R
11
to R
15
are not simultaneously branched-chain or straight-chain, nonsubstituted alkyl groups.
(2) A silver halide color photographic lightsensitive material comprising at least one layer on a support, wherein the at least one layer contains a coupler represented by formula (II) below.
In formula (II), X represents a member selected from the group consisting of a hyd
Kato Yasuhiro
Kojima Tetsuro
Matsuda Naoto
Mikoshiba Hisashi
Birch & Stewart Kolasch & Birch, LLP
Letscher Geraldine
LandOfFree
Silver halide color photographic lightsensitive material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Silver halide color photographic lightsensitive material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Silver halide color photographic lightsensitive material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3113364