JPS587982B2 - Insatsuyoushashingenbannogenzouzai - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an infectious developer containing hydroquinone as a main component, and more specifically to a developer for printing photographic plates containing a compound represented by the following general formula. The aim is to improve the photographic properties of the photographic materials processed thereby, particularly with regard to the halftone dot quality.

General formula (wherein R1 and R2 are hydrogen or a lower alkyl group such as methyl, ethyl, probyl, butyl, R3 is hydrogen or a lower alkyl group such as methyl, ethyl, propyl, butyl, or hydroxyethyl, hydroxypropyl, hydroxy Represents a hydroquine alkyl group such as butyl.

) Generally, photographic plates for printing consisting of line drawings or halftone dot images use a high-contrast lithium-type silver halide photosensitive material, and are processed using a high-contrast developing solution called infectious developer, which uses hydroquinone as a developing agent and has a low concentration of free sulfite ions. It is obtained by developing.

Unlike ordinary developing solutions with a high sulfite ion concentration, hydroquinone is oxidized with the passage of time after the developer is prepared, resulting in infectious developer properties. This has the disadvantage that photographic properties, particularly halftone dot performance, are deteriorated.

Conventionally known contagious developers have these drawbacks and are not yet fully satisfactory in practical use.The most important properties of contagious developers are improvement of halftone dot quality and stability of the solution itself (stable Characteristics that enable good halftone dot performance) have been desired.

According to the present invention, it has been found that as a result of incorporating the compound represented by the above general formula into a conventional infectious developer, the deterioration of infectious developability over time is small, and in other words, deterioration of halftone dot performance over time is prevented. Ta.

The infectious developer according to the present invention is mainly composed of a dihydroquine benzene type developing agent such as hydroquinone, halogen-substituted hydroquinone, or alkyl-substituted hydroquinone, alone or in combination.

This developer may further contain compounds containing carbonyl (>C=0) and soluble sulfites, such as aldehyde hydrogen sulfite, adducts of alkali salts, cyclohequinone or adducts of acetone and soluble sulfites. that aliphatic 1
Preservatives for developing agents consisting of condensation products with primary or secondary amines or alkaline agents such as potassium carbonate, alkali borates, organic aliphatic amines, etc. Classes, Resoluns, Picdazines, Nsteins, Insutins, 1
Air antioxidants such as class, secondary or tertiary amines, hydrazines, hydroquinamines = 6-nitropenzimidazole, 5 or 6 nitroimidazole, 5-mercaptotetrazole, imidazoles, tetrazaindenes, etc. Development control agents: glycols such as triethylene glycol, organic solvents such as amines, alcohols, etc., and halftone improvers such as polyalkylene oxides may also be included as necessary6. The compound is disclosed in U.S. Patent No. 3,573,914,
6628, Japanese Patent Application Publication No. 48-76601, Japanese Patent Application Publication No. 48-50
732, Japanese Patent Publication No. 48-41802. Japanese Patent Publication No. 48-418
It is also effective against the infectious developer described in No. 03.

Although the compound of the present invention varies depending on the type of infectious developer and the type of lithium-type silver halide photosensitive material to be processed, it is generally used effectively in a range of about 0.5 to 50 g per 1 liter of infectious developer. , or a combination of two or more selected from the general formula.

Next, typical examples of the compound represented by the above general formula will be shown.

1 1 Ethylene urea 2 N-methylethylene urea 3 N-ethyl ethylene urea 4 N-propyl ethylene urea 5 N-t-butyl ethylene urea 6 N-t-amyl ethylene urea 7 N-hydroquine ethyl ethylene urea 8 N- Hydroxypropylethyleneurea 9 4-Methylethyleneurea 10 4-Methylethyleneurea 11 4-Propylethyleneurea 12 4.5-Dimethylethyleneurea 13 4-Ethyl-5-methylethyleneurea 14 N-
Methyl-4-methylethyleneurea 15 N-methyl-4
, 5-dimethylethylene urea 16 N-hydroquinethyl-4-methylethylene urea These compounds represented by the above general formula are known from various literatures, and the present invention relates to a new use of these compounds. .

The lithium-type silver halide emulsions used in the lithium-type silver halide photosensitive materials suitable for processing with the developer of the present invention include silver chloride emulsions, silver bromide emulsions, silver chlorobromide emulsions, and chlorobromo-iodide emulsions. Various emulsions can be used, such as silver emulsions and silver chloroiodide emulsions, but silver chlorobromide emulsions or silver chloroiodobromide emulsions containing silver chloride in a molar ratio of 50 or more are particularly preferred.

These emulsions can be chemically sensitized by gold sensitization, sulfur sensitization, or the like, or optically sensitized using sensitizing dyes such as nanine dyes and merocyanine dyes.

Furthermore, various photographic additives such as high contrast enhancers such as palladium, platinum, rhodium, and cobalt, stabilizers such as triazole, tetrazole, and tetrazaindenes, and accelerators such as anti-cuffing agents: imidazole and mercaftobenzimidazole compounds: formaldehyde. , halogen-substituted acids such as mucochromic acid, hardening agents such as ethyleneimine compounds, spreading agents such as polyethylene glycol, glycerin, esters of ethylene glycolic acid, polyvinylpyrrolidone, aqueous dispersions of synthetic resins (so-called latex)
A physical property improver such as the like can be included.

As a support for such an emulsion, a suitable support such as a synthetic resin such as polyethylene terephcrate, polycarbonate, or cellulose triacetate, or glass may be used.

When the exposed lithium-type silver halide photosensitive material according to the present invention is processed with the developer having the above structure, excellent photographic properties can be obtained due to the stability of the photographic performance of the solution.

Next, the present invention will be explained in more detail with reference to Examples, but the embodiments of the present invention are not limited thereto.

Example 1 A lithium-type silver chlorobromide seratin emulsion containing 70 mol% of silver chloride was chemically sensitized using a combination of gold sensitization using chloroauric acid and sulfur sensitization using sodium thiosulfate, and then optically sensitized using melonanine dye. Then, general photographic additives such as a stabilizer, a hardening agent, and a spreading agent were added, and the mixture was coated and dried by a conventional method on a subbed polyethylene terephthalate film to produce a lithium-type photosensitive material.

This sample was passed through a gray contact screen and brought into close contact with a step wedge, and then exposed to light using a tungsten lamp as a light source.The sample was then exposed (a) immediately after preparation and (b) in contact with the atmosphere with an infectious developer containing the compound of the present invention as described below.
After leaving for 1 day, heat at 27°C for 1 minute and 30 seconds.
Step development was carried out for 2 minutes and 2 minutes and 30 seconds, followed by fixing, washing with water, and drying in a conventional manner.

Table 1 shows the results of measuring the specific sensitivity and evaluating the halftone dot quality for each sample obtained.

The formulation of the infectious developer used was as follows. Infection developer warm water 750ml Sodium sulfite (anhydrous) 3g Formaldehyde sodium bisulfite adduct
60g hydroquinone 16
g Boric acid 6 g Potassium bromide 2 g Sodium carbonate (1
water salt) 80 g Compound of the present invention (used as shown in Table 1) Add water to 1000 ml The comparative sample in the table was treated in the same manner as above using the above infectious developer except for the compound of the present invention. This is what I got.

The quality of the halftone dots in the table above is determined by visually inspecting the halftone dot performance of the sample obtained, and grading the halftone dots into 5 grades, with those with small and sharp cringes around the halftone dots being grade 5, and those with very many fringes being grade 1. It was evaluated as follows.

As is clear from the above table, the infectious developer to which the compound according to the present invention has been added has less decrease in sensitivity due to standing than the infectious developer to which the compound according to the present invention is not added, and has good characteristics with less deterioration in halftone dot quality. It can be seen that it shows.

Example 2 The same procedure as in Example 1 was carried out except that the following contagious development to which the compound according to the present invention was added was used.

The results are shown in Table 2.

Infectious developer hot water 750ml Sodium sulfite (anhydrous) 3g Formaldehyde Sodium bisulfite adduct 60g Hydroquinone 16g Boric acid
6g potassium bromide
2g Sodium carbonate (monohydrate) 60g
Diethanolamine 45 g Compound of the present invention (used as shown in Table 2) Add water to 1000 ml As is clear from the above table, the sample obtained using the infectious developer to which the compound of the present invention was added was compared to the comparative sample. It can be seen that there is little decrease in sensitivity and good halftone dot quality.

This becomes even clearer when comparing the optimum development time.

Example 3 The same procedure as in Example 1 was carried out except that the following infectious developer containing the compound according to the present invention was used.

The results are shown in Table 3.

Infectious developer hot water 750ml Sodium sulfite (anhydrous) 3g Formaldehyde sodium bisulfite adduct 60g Hydroquinone 16g Boric acid
6g potassium bromide
2g Sodium carbonate (monohydrate) 80gN
-Methyl 1,3-diaminofuropane 3 g Compound of the present invention (used as shown in Table 3) Add water to 1000 ml Obtained using an infectious developer to which the compound according to the present invention has been added as shown in the table above. It can be seen that the sample has good halftone dot quality with less decrease in sensitivity than the comparative sample.

Claims (1)

[Scope of Claims] 1. A developer for a photographic original plate for printing, characterized in that a compound represented by the following general formula is contained in an infectious developer containing hydroquinone as a main component. General formula (wherein R1 and R2 are hydrogen or lower alkyl groups, R
3 represents hydrogen, a lower alkyl group or a hydroxyalkyl group. )