Radiation imagery chemistry: process – composition – or product th – Nonradiation sensitive image processing compositions or... – Developer
Reexamination Certificate
2001-01-29
2003-10-14
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Nonradiation sensitive image processing compositions or...
Developer
C430S933000
Reexamination Certificate
active
06632594
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to processing compositions for silver halide photographic materials and image forming methods using the same, and, in particular, to such compositions and methods that can effectively suppress stain generation caused by spectral sensitizing dyes remaining in the photographic materials after processing, and that do not form precipitates even when the processing compositions are kept under low temperature storage conditions.
BACKGROUND OF THE INVENTION
In the rapid progress of digital still cameras as well as various color printers, the processing of silver halide color photographic materials are expected to provide customers with high quality images as quickly as possible. When the time of the conventional photographic processing is simply curtailed, spectral sensitizers used in photographic materials tend to remain after processing because the processing terminates before the sensitizers are completely washed out from the materials. In the case of color print, a noteciable amount of remaining sensitizers causes the background of the print images to assume color, thus deteriorating the print appearance to an unacceptable level. A similar problem takes place for the highlights of color reversal films with a simple curtailing of processing time. In color negative films, the minimum density levels tend to rise, causing color balance to collapse to such a degree that favorable prints cannot be obtained.
Research Disclosure (RD) 20733 describes a method using bis(triazinylamino)stilbene disulfonic acid compounds to effectively remove stains caused by spectral sensitizers. This method is now in a wide use for the processing of color photographic materials. JP-A-6-329936 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”) discloses bis-triazynyldiaminostilbene disulfonic acid compounds that can suppress stains even in rapid processing.
Recently, however, a still more concentrated processing compositions are strongly demanded to reduce container waste, improve container recyclability, reduce transportation and storage costs, etc. There have been no compounds that stably dissolve at a high salt concentration and that, when used in their solubility limit, exhibit a sufficient effect at rapid processing.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide processing compositions for silver halide color photographic materials, wherein the compositions can effectively prevent stain formation caused by residual spectral sensitizers and the compositions do not form precipitate under low temperature storage conditions.
Another purpose of the present invention is to provide methods of forming photographic images which can suppress stain generation by using processing compositions that do not form precipitate under low temperature storage conditions.
The above-mentioned problems have been solved by the following present invention.
(1) A processing composition for a silver halide photographic material, which comprises at least one compound selected from the group consisting of compounds represented by the following general formulae (I) and (II):
wherein R
11
and R
12
each independently represents a hydrogen atom or an alkyl group; R
13
and R
14
each independently represents a hydrogen atom, an alkyl group or an aryl group; R
15
represents an alkyl group having at least one asymmetric carbon atom or a group represented by the following general formula (I-a):
—CH
2
O(CH
2
CH
2
O)n
11
H (I-a)
wherein n
11
represents an integer of from 1 to 3; R
16
represents an alkyl group having at least one asymmetric carbon atom or a group represented by the following general formula (I-b):
—(CH
2
CH
2
O)n
12
H (I-b)
wherein n
12
represents an integer of from 2 to 4; and M
1
represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium group or a pyridinium group, R
13
may complete a ring together with R
15
, and R
14
may complete a ring together with R
16
, respectively:
wherein R
21
, R
22
, R
23
and R
24
each independently represents a hydrogen atom, an alkyl group or an aryl group; R
25
and R
26
each independently represents an alkyl group having at least one asymmetric carbon atom or a group-represented by the following general formula (II-a):
—(CH
2
CH
2
O)n
21
H (II-a)
wherein n
21
represents an integer of from 2 to 4; R
27
and R
28
each independently represents an alkyl group having at least one asymmetric carbon; and M
2
represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium group or a pyridinium group; and R
21
and R
25
, R
22
and R
26
, R
23
and R
27
, and R
24
and R
28
, each pair may be bonded together to form a ring.
(2) The processing composition described in (1) above, wherein the composition contains at least one of the compound represented by general formula (I) in which R
15
and/or R
16
contains at least one hydroxyl group and the compound represented by general formula (II) in which at least one group chosen from R
25
, R
26
, R
27
and R
28
contains at least one hydroxyl group.
(3) The processing composition described in (2) above, wherein the at least one of the compound represented by general formula (I) and the compound represented by general formula (II) has 2 to 8 hydroxyl groups.
(4) The processing composition described in (3) above, wherein R
11
, R
12
, R
13
and R
14
in general formula (I) and/or R
21
, R
22
, R
23
and R
24
in general formula (II) each is a hydrogen atom.
(5) The processing composition described in (1) above, wherein the compound represented by general formula (I) is selected from the group consisting of the following compounds:
and the compound represented by general formula (II) is selected from the group consisting of the following compounds:
(6) The processing composition described in any one of (1) to (5) above, that is a color developer composition.
(7) The processing composition described in any one of (1) to (6) above, that has a pH of from 12 to 13.5.
(8) The processing composition described in any one of (1) to (7) above, that is a one-part color developer composition.
(9) An image forming method comprising using the processing composition described in any one of (1) to (8) above.
(10) A method for reducing stain caused by residual sensitizing dyes in silver halide photographic materials, which comprises using the processing composition described in any one of (1) to (8) above.
Among the compounds of the present invention, the structure represented by general formula (I) is involved in the claims of JP-A-6-332127, JP-A-7-140625 and JP-A-10-104809. However, these specifications do not specify the specific compounds corresponding to those of the present invention at all. Therefore, it is impossible to predict the structures and properties of the compounds of the present invention from these patent documents.
DETAILED DESCRIPTION OF THE INVENTION
General formulae (I) and (II) will be explained more in detail.
The alkyl groups represented by R
11
and R
12
are preferably of C
1-20
, more preferably of C
1-8
, and still more preferably of C
1-4
; they may be substituted or unsubstituted. The substituents include a hydroxyl group, an alkoxy group (e.g., methoxy, ethoxy, etc.), a sulfonic acid group, an ethyleneoxy group, etc. These groups may be further substituted with the groups mentioned above. Practical examples of the alkyl groups represented by R
11
and R
12
are methyl, ethyl, n-propyl, iso-propyl, n-octyl, 2-hydroxyethyl, 3-hydroxypropyl, 2-hydroxypropyl, 2-sulfoethyl, 2-methoxyethyl, 2-(2-hydroxyethoxy)ethyl, and 2-[2-(2-hydroxyethoxy)ethoxy]ethyl, and 2-(2-[2-(2-hydroxyethoxy)ethoxy]ethoxy)ethyl. Preferable examples of R
11
and R
12
are hydrogen, methyl, ethyl, n-propyl, n-butyl and 2-sulfoethyl, and more preferable ones are hydrogen, methyl, ethyl, and 2-sulfoethyl while the most preferable ones are hydrogen and methyl.
The preferable numbers of carbon atom, the preferable subst
Kimura Keizo
Nakai Yasufumi
Tanaka Shigeaki
Yabuki Yoshiharu
Fuji Photo Film Co. , Ltd.
Le Hoa Van
Sughrue & Mion, PLLC
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