JPS581769B2 - Elephant Elephant - Google Patents

Description

[Detailed description of the invention] The present invention relates to a developer used for diazo photosensitive materials.

The developing solution of the present invention is characterized in that a phosphoric acid ester represented by the following general formula is contained in an alkaline solution containing an inorganic alkaline substance and/or an organic amine.

In the above formula, R1, R2 and R3 are -(CH2CH20)
nR4 (R4 is an alkyl group or aralkyl group having 8 to 30 carbon atoms, n is an integer of 1 to 10) or hydrogen, and R1, R2 and R3 are not all hydrogen at the same time.

A diazo photosensitive material is a photosensitive material whose main components are a diazo compound and a coupling component that produces an azo dye by coupling with the above diazo compound. A photosensitive material has a photosensitive layer on a support that mainly contains a diazo compound and a coupling component. To use such a photosensitive material, it is exposed through an original image and then developed using an alkaline solution. It is well known that a solution is applied to the photosensitive layer and developed, but in this case, as little developer solution as possible,
For example, a so-called semi-dry developing method, in which development is performed using a small amount of developer of 3 g or less per 1 m 2 of photosensitive material, has been proposed and put into practice.

However, in this case, although a roller is used to uniformly apply the developer to the photosensitive layer, uneven development may occur because the amount of developer is small.

The present invention has been made to eliminate such defects, and the present inventor has developed a developing method in which a phosphoric acid ester as described above is added in an amount of at least 0.01% to an alkaline solution. It has been discovered that by using a liquid, the above-described defect of uneven development can be eliminated.

The present invention is based on this discovery, and the amount of the phosphoric acid ester mentioned above is effective up to 1.0% in an alkaline solution, and even when used in an amount larger than this, no particularly remarkable effect is observed. However, it is economically disadvantageous.

As the above phosphoric acid ester, R1, R2 of the above general formula
and a monophosphoric acid ester in which one of R3 is -(CH2CH20)nR4, a diphosphoric acid ester in which two of them are -(CH2CH20)R4, and a trilithic acid ester in which all of them are -(CH2CH2O)R4. be able to.

The alkaline developer to which the above phosphate ester is added is
Aqueous solutions of inorganic alkaline substances such as sodium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, potassium meborate, and potassium tetraborate, or aqueous or organic solutions of amines such as monoethanolamine and hexylamine, as well as these. It is a mixed liquid.

An example of the formulation of the developer containing a phosphate ester according to the present invention is shown below.

No. 1 Monoethanolamine 15 parts by weight Potassium metaborate 5 Polyoxyethylene nonyl 0.1 Phosphate ester (n=2) Diethylene glycol monomethyl ether 79.9 parts by weight No. 2 Potassium metaborate 12 parts by weight Potassium citrate 0.2 Polyoxyethylene octyl 0.2〃 Diphosphate ester (n=2) Water 87.6〃 No.3 Monoethanolamine 12 parts by weight Potassium metaborate 5〃 Polyoxyethylene octyl 0.1〃 Monophosphate ester (n=5) Diethylene glycol Monomethyl ether 82.9 No. 4 Monoethanolamine 20 parts by weight Polyoxyethylene octyl 0.7 Triphosphate (n=3) Water 79.3 parts by weight No. 5 to No. 8 For comparison, the present invention of No. 1 to No. 4 above A developer was prepared using exactly the same recipe except that no phosphoric acid ester was added.

Furthermore, a comparative developer was prepared according to the following formulation.

No. 9 Monoethanolamine 15 parts by weight Potassium metaborate 5〃 Polyoxyethylene nonyl 0.1〃 Phenol ether diethylene glycol monomethyl ether 79.9 parts by weight No. 10 Potassium metaborate 12 parts by weight Potassium citrate 0.2〃 Polyoxyethylene 0.1 〃 Monooleate water 87.7 parts by weight In order to compare the above developer, a two-component type diazo photosensitive material prepared as follows was used, development was performed using a semi-dry diazo copying machine, and the amount of developer used was Development was carried out at 3 g/1 m2.

Diazo sensitive material: tartaric acid 2g zinc chloride
5g thiourea
2g sabonin
0.1g water
A photosensitive solution prepared by mixing 100 cc of the above components was applied onto white paper and dried to obtain a diazo photosensitive material used in the test.

Exposure and development were performed under exactly the same conditions as described above, but the development performed using the developer solutions No. 1 to No. 4 of the present invention was compared to the development performed using other developers No. 5 to No. 10. It turned out to be extremely good.

That is, when developing using No. 5 to No. 10 developing solutions, uneven development was sometimes observed, but when developing using No. 1 to No.
When development is carried out using the o4 developer of the present invention,
In all cases, no uneven development was observed, and copies with clear blue dye images were obtained.

Claims (1)

[Claims] 1. In an alkaline solution, the following general formula (wherein R1, R2 and R3 are -(CH2CH20)n
R4 (R4 is an alkyl group or aralkyl group having 8 to 30 carbon atoms, n is an integer of 1 to 10) or hydrogen, and R1, R2 and R3 are not all hydrogen at the same time) A developing solution for diazo photosensitive materials, characterized in that it contains at least one kind of phosphoric ester represented by: