Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
2000-05-24
2001-02-27
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S955000, C430S552000, C430S553000, C430S554000, C430S555000, C430S556000, C430S557000, C430S558000
Reexamination Certificate
active
06194131
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 11-143327, filed May 24, 1999, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a silver halide photographic lightsensitive material which is excellent in color reproduction and graininess. More particularly, the present invention relates to a silver halide photographic lightsensitive material which contains a novel compound capable of rapidly trapping developing agent oxidation products.
The method of forming color images by first exposing a silver halide color photographic lightsensitive material and subsequently processing the exposed material with a color developing solution containing a developing agent of an aromatic primary amine, is well known for long. In this method, generally, the subtractive color processes are employed for color reproduction, and use is made of silver halide emulsions which are selectively sensitive to blue, green and red, in which agents for forming respectively complementary yellow, magenta and cyan color images (couplers) are contained.
With respect to this color forming method, it is known to add a compound capable of effectively trapping developing agent oxidation products in order to avoid such problems that fogging and graininess deterioration are caused by reactions between developing agent oxidation products produced in excess and couplers and that produced developing agent oxidation products are diffused into other layers to thereby bring about color turbidity.
Redox compounds are known as providing such a trapping agent for developing agent oxidation products, which redox compounds include, for example, ballasted hydroquinone (1,4-dihydroxybenzene) compounds described in U.S. Pat. Nos. 3,700,453 and 4,732,845, ballasted gallic acid (1,2,3-trihydroxybenzene) compounds described in U.S. Pat. No. 4,474,874, ballasted sulfonamidophenols described in U.S. Pat. Nos. 4,205,987 and 4,447,523, ballasted resorcinol (1,3-dihydroxybenzene) compounds described in U.S. Pat. No. 3,770,431 and hydrazide compounds described in U.S. Pat. No. 5,230,992, Jpn. Pat. Appln. KOKAI Publication No. (hereinafter referred to as JP-A-) 4-238347 and JP-A-8-240892. However, it is very difficult for these redox compounds to be excellent in both capability of trapping developing agent oxidation products (hereinafter referred to as “activity”) and stability. Redox compounds with high activity have a drawback in that, when stored for long, they adversely affect the silver halide emulsion to thereby cause fogging and disorder of gradation. On the other hand, redox compounds with enhanced stability suffers from a lowering of activity. Moreover, it is not less frequent that such redox compounds per se form colored residue by trapping developing agent oxidation products.
As other forms of trapping agents for developing agent oxidation products, there are known systems utilizing coupling reactions, such as colorless compound forming couplers which couple with developing agent oxidation products to thereby form substantially colorless compounds as described in, for example, U.S. Pat. No. 3,876,428, JP-A-50-150434 and Jpn. Pat. Appln. KOKOKU Publication No. (hereinafter referred to as JP-B-) 57-51662 and outflowing dye forming couplers which form water-soluble dyes by coupling substantially not to thereby contribute to image formation as described in, for example, JP-A's-59-171955, 1-129252 and 6-138612. However, the former colorless compound forming couplers have a drawback in that the activity thereof is so low that a large amount of colorless compound forming coupler must be used for exerting the desired effect. On the other hand, the latter outflowing dye forming couplers, although both activity and stability can be relatively easily attained by optimizing the coupler nucleus and split-off groups thereof, have the danger of contaminating the processing solutions because of the outflow of formed dyes into the processing solutions. This contamination of the processing solutions is unfavorable in these days in which the reduction of replenisher for the processing solutions is being demanded. Further, the structure of the above outflowing dye forming couplers is so complex that it is not few that the production cost thereof is high.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to provide a silver halide lightsensitive material which contains a novel trapping agent for developing agent oxidation products that is highly active, ensures excellent storage stability, can be produced at low cost and is free from the danger of contaminating processing solutions, and which is further improved in graininess.
The object of the present invention has been attained by a silver halide color photographic lightsensitive material characterized by containing a compound represented by the general formula:
COUP—A—E—B (I)
wherein COUP represents a coupler residue capable of coupling with a developing agent oxidation product; E represents an electrophilic moiety; A represents a single bond or divalent connecting group which can release B while forming a 4 to 8-membered ring through an intramolecular nucleophilic substitution reaction between the electrophilic moiety E and a nitrogen atom of a coupling product of COUP with a developing agent oxidation product, the nitrogen atom being attributed to the developing agent and directly bonded to a coupling position of COUP, provided that A may be bonded to COUP at the coupling position or position other than the coupling position of COUP; and B represents a photographically inert group.
DETAILED DESCRIPTION OF THE INVENTION
The trapping agent for developing agents in an oxidized form, hereinafter also referred to as developing agent oxidation products, for use in the silver halide color photographic lightsensitive material of the present invention (hereinafter also referred to as “the sensitive material of the present invention” or “the lightsensitive material of the present invention”) will be described in detail below.
The trapping agent for developing agent oxidation products for use in the present invention is one characterized by coupling with a developing agent oxidation product to form a coupling product, thereby the developing agent oxidation products can be trapped. The coupling product subsequently forms a ring substantially not contributing to color image formation through an intramolecular nucleophilic substitution reaction with a nitrogen atom of the coupling product. The nitrogen atom originates from the developing agent and directly bonds to a coupling position of the trapping agent. This characteristic is exhibited by the coupler represented by the general formula:
COUP—A—E—B (I).
In the formula, the coupler residue represented by COUP may be any of yellow coupler residues (for example, open-chain ketomethine coupler residues such as acylacetanilide and malondianilide), magenta coupler residues (for example, 5-pyrazolone and pyrazolotriazole coupler residues) and cyan coupler residues (for example, phenol, naphthol and pyrrolotriazole coupler residues) which are generally known as photographic couplers, or may be any of yellow, magenta or cyan dye forming coupler residues having novel skeletons described in, for example, U.S. Pat. No. 5,681,689, JP-A's-7-128824, 7-128823, 6-222526, 9-258400, 9-258401, 9-269573 and 6-27612, all the disclosures of which are herein incorporated by reference. Further, the coupler residue represented by COUP may be selected from among other coupler residues (for example, coupler residues capable of reacting with oxidation products of an aromatic amine developing agent to thereby form colorless substances as described in, for example, U.S. Pat. Nos. 3,632,345 and 3,928,041, the disclosures of which are herein incorporated by reference, and coupler residues capable of reacting with oxidation products of an aromatic amine develop
Ito Takayuki
Kobayashi Hidetoshi
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Letscher Geraldine
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