JPS63235938A - Method for processing silver halide photosensitive material - Google Patents

Abstract

PURPOSE:To prevent the titled material from the formation of a silver sludge, and to improve the reducing property of a developer by incorporating two or more than two kinds of specified compds. in the developer. CONSTITUTION:The two or more than two kinds of the compds. shown by formula I are incorporated in the developer. In formula I, X is hydrogen atom. or 1-5C a lower alkyl group, Y is hydrogen atom. or a substd. or an unsubstd. lower alkyl or a substd. or an unsubstd. amino group. The total additional amount of said two kinds of compds. to the developer is less than 2g/l, and the compounding ratio of said two kinds of compds., can be optionally selected within a range of (1/9)-(9/1) by mol. ratio. Thus, the formation of the silver sludge is reduced, and the preferable reducing property of the developer suitable for printability, is obtd.

Description

[Detailed Description of the Invention] (N) Industrial application field relates to the field of halocarbon photography, especially: a method for developing silver images using a silver halide photosensitive plate for plate making. It is.

(r+) Prior art and its problems Reduction processing is a method in which a silver halide photographic material is exposed and developed, and then image silver is dissolved with a silver oxidizing agent to improve the dot area ratio.

In particular, when obtaining a printing original plate 'f using a silver halide photographic light-sensitive material for plate making, in order to obtain a halftone gradation suitable for the printing characteristics and to obtain better color reproduction, the above plate making method is used. It is often done to partially or completely correct the image (&) by subjecting the photographic light-sensitive material for plate-making to a force-reducing process to reduce the halftone dot area. The characteristic ability is a process that oxidizes and dissolves the silver image, and by applying power reduction processing to the halftone dot image, the halftone dot area is reduced.Therefore, the range in which both halftone images can be corrected by power reduction processing is It is limited by the degree of decrease in blackening density per halftone dot as the dot area decreases.
A measure of the power reduction processing ability is whether the halftone dot area can be reduced as much as possible while maintaining an appropriate density as a printing original plate.

On the other hand, sulfites are often used in the developer used for developing silver halide photosensitive materials for the purpose of increasing the storage stability of the developer. Particularly in rabbit access processing, which has been widely used in recent years, a high concentration of sulfite of 0.1 mol/i or more is contained in the developer in order to improve the storage stability of the developer.

When a silver halide photographic light-sensitive material is processed with such a developer, a large amount of silver complex is eluted into the developer, and the eluted silver complex is reduced to form silver sludge.

In particular, when a large amount of silver halide photographic material is continuously processed using an automatic processor, silver sludge may adhere to the developing roller or the tank wall, and the surface of the silver halide photosensitive material may be coated. contaminate and result in quality deterioration.

In order to prevent such silver sludge, a method is known in which a merkaft compound is added to the reaction solution. (British Patent No. 940,169, British Patent No. 1,144.481, U.S. Patent No. 3.173.789, British Patent No. 3.628,9
No. 55, JP-A No. 54-13331, JP-A No. 56-2434
No. 7, No. 56-7244.1, No. 57-2684-8
(No. 57-116340) However, when a Mercast compound is added to the developer in this way, silver sludge is prevented, but there is a problem in that the reduction properties mentioned above do not reach a desirable level. It turns out.

(0) Purpose of the Invention The present invention relates to a developing method for a silver halide photographic light-sensitive material, and more specifically, a method for developing a silver halide photographic light-sensitive material for plate making that prevents silver sludge and is suitable for inkling characteristics. This invention relates to a developing method that provides undesirable force reduction characteristics.

(D) Structure of the Invention As a result of intensive research aimed at achieving the above objective, the Ministry of the Invention has found that:
In a processing method in which a silver halide photographic light-sensitive material is imagewise exposed, subjected to a development process with an alkaline processing liquid, and then subjected to a reduction treatment with a silver oxidizing agent, two types of compounds represented by the general formula (■) are added to the developer. It has been found that by including the above-mentioned components, a preferable development process suitable for reducing force characteristics can be obtained for silver halide photographic light-sensitive materials.

(■) x: Hydrogen or O4
-C5 lower Y alkyl group Specific examples of these compounds will be shown below, but the present invention is not limited to these.

The amount of these compounds added is such that the total amount of the two types of compounds is 29/
1, and the mixing ratio is 1:9 to 9:1.
It can be arbitrarily selected within the range of (molar ratio).

The silver halide emulsion used in the present invention may be produced by any of the acid method, neutral method, and ammonia method. It can also contain polyvalent metals. The present invention also relates to the properties of silver halide photographic emulsions, such as the composition of silver halide (for example, tin bromide, silver chloride, silver chlorobromide, silver iodobromide, silver chloroiodobromide), and It can be carried out regardless of silver crystal shape, crystal habit, and size.

The emulsion used in the present invention can contain various additives. For example, chemical sensitizers (for example, sensitizers such as thiourea and hypo, noble metal sensitizers such as gold, platinum, and iridium compounds), reduction sensitizers, and organic desensitizers are also used. It can be used as In addition, spectral sensitization MIJ
, super sensitizer, stable area, anti-fogging piece], surfactant piece J, developer oki', development accelerator, hardener, hardening accelerator, dye solution improver, whitening agent, thickener and their precursors.

Protective colloids for the silver halide emulsion used in the present invention include gelatin, modified seratin, albumin, agar, gum arabic, natural products such as alginic acid, polyvinyl alcohol, polyvinylpyrrolidone, and copolymers of acrylamide, acrylic acid, and vinylimidazole. Water-soluble synthetic resins such as

The silver halide photographic emulsion used in the present invention can be prepared on a suitable support, such as glass, cellulose acetate film, polyethylene terephthalate film, paper, barique coated paper,
A polyolefin (eg, polyethylene, polypropylene, etc.) coated soil is applied to the soil, such as paper. These supports may be corona treated by a known method, and may also be undercoated by a known method if necessary.

The silver halide photographic emulsion used in the present invention is coated with a protective layer, an intermediate layer, an ultraviolet absorbing layer, an undercoat layer or other silver halide emulsions, if necessary.

As the aqueous alkaline developer used in the present invention, those having generally known compositions can be used. As developing agents, dihydroxypencenes (e.g. hydroquinone), 3-pyrazolidones (e.g. 1-phenyl-
(3-pyrazolidone), amine phenols, ascorbic acid, etc. may be used alone or in combination.

The amount added is 0.005 to 0.5 mol/1.

The aqueous alkaline developer used in the present invention contains a sulfite preservative for the purpose of completely protecting the developer from air oxidation. For example, sodium sulfite, potassium sulfite, potassium metabisulfite, sodium bisulfite, etc. are added. The preferred amount added is 0.25 to 1.00 mol/no.

The aqueous alkaline developer used in the present invention can contain potassium hydroxide, sodium hydroxide, potassium carbonate, sodium carbonate, sodium acetate, tribasic potassium phosphate, etc. for pH adjustment.

71 The aqueous alkaline developer used in the present invention can contain the necessary organic antifoggants for the purpose of obtaining favorable photographic properties in order to minimize the formation of fog.

Penzotriazonope 6-nidropenzimidazole 4.5-methylbesozotriazonope 1-phenyl-2-tetrazoline-5-thione, 5-phenyltetrasol, 1-phenyl-5-merkabuto Tetrazonope 5-nitrointasol, 6-nitrointazole, etc. are common.

The aqueous alkaline developer in the present invention includes ascorbic acid,
It can contain antioxidants such as jetanolamine and kojic acid, water softeners such as nitrilotriacetic acid and ethylenediaminetetraacetic acid, polyalkylene methoxides, amine compounds, and organic solvents such as triethylene glycol and methanol.

Many types of reducing fluids are known for use in the present invention. For example, reducing agents using reducing agents such as permanganates, ferric salts, ceric salts, red blood cells, persulfates, and dichromates are known.

As the fixer, one having a generally well-known composition can be used. As the fixing agent, in addition to thiodinates and thiocyanates, organic sulfur compounds known as fixing agents can be used.

(E) Examples Example 1 Silver chlorobromide containing 95 mol % of iron chloride was mixed in a conventional manner and subjected to physical ripening to obtain an emulsion with an average grain size of 0.1 μm and a narrow particle size distribution. After desalting and redissolving this emulsion, Pinacrip Yellow was added as an organic desensitizer at a concentration of 500 η per mole of silver halide, a hardener and a surfactant were added, and the silver was coated on a polyester film at a concentration of 3.5 μm. /m' together with a ceratin solution for a protective layer, and dried.

The sample was subjected to contact exposure with 150i50% halftone dots using a printer using a high-pressure mercury lamp as a light source.

Furthermore, the five types of developing solutions shown in Table 1 are made into 1/F=
Development was performed at 38 degrees for 20 seconds, fixed, and dried.

Table-1 Developer formulation IIJ has the same pressure of 7.

Next, each sample was subjected to a force reduction process using a commercially available force reducer.

The treatment conditions were 20° C. and the reduction time was varied between 10 seconds and 100 seconds. For each sample, the range of change in dot area ratio was determined under the condition that the dot density was 3.0 or more. This is called a reduction in force 1. C%) Table 2 shows the results of the force reduction widths measured for Tanifuki (1) to (5).

Table 2 As can be seen from the results of Cloth 2, samples containing one type of mercahoot compound @ represented by general formula (I) ((1) to (4)
)) shows a slight reduction in force reduction capacity compared to the blank sample (5), but from the point of view of work efficiency,
In addition, when the power was reduced over a wide range, a halftone image of 150% and 50% was printed using the same method on the same halogenated light-sensitive material.

Furthermore, 10 types of processing samples indicated by VCC84 were prepared at 1'F, and after development (38 degrees for 20 seconds), constant cooling, drying, and force reduction were performed, and the force reduction width was measured in the same manner.

Table 4 shows the measurement results of the force reduction width.

P5e-4 As seen from @e4, by combining the compounds of general formula (I), the force-reducing ability (
You can find out which leathers can obtain super-additive properties.

(Left below) Example 2 In the same manner as in Example 1, 150 lines and 50
% halftone image preservation burned. Further, it was treated with 5 kinds of Lith developer as shown in Table 5 (for 2 minutes in 20 minutes), and then fixed.
Dry * removal and force reduction processing were performed, and the force reduction was measured at the corners using the same method.

What about the reduction width? Table 6 shows the 1I11 results.

Next, the same emulsion was printed with a 150x50% single-point touch using the same method, and then developed using the 10 types of processing shown in Table 7 (20f x 2 minutes), fixed, and dried. After performing the force reduction process, the result of reducing the force reduction width is shown in SVC.

Female-7 Table-8 From Table 8, the superadditivity effect of the compound of the present invention was also confirmed in the squirrel present condition.

Claims (1)

[Scope of Claims] In a processing method in which a silver halide photosensitive material is imagewise exposed, developed with an alkaline processing solution, and then subjected to a reduction treatment with a silver oxidizing agent, a compound represented by the general formula [I] is present in the development solution. A method for processing a silver halide photosensitive material, characterized in that it contains two or more types of compounds. [I] ▲There are mathematical formulas, chemical formulas, tables, etc.▼ X: Hydrogen or lower alkyl group of C_1 to C_5 Y: Hydrogen, substituted or unsubstituted lower alkyl group, substituted or unsubstituted amino group.