JPH03184038A - Production of silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To prevent the deterioration in performance by the stagnation of a silver halide emulsion coating liquid contg. various additives by rapidly dissolving and applying the coating liquid at the time of refrigerating or freezing and applying the above-mentioned coating liquid. CONSTITUTION:The silver halide emulsion coating liquid contg. the various additives is rapidly dissolved and applied at the time of refrigerating or freezing and applying the above-mentioned coating liquid. As a rule, all the additives are added to the coating liquid after second maturation and the coating liquid is frozen or refrigerated but when there is a danger of causing a reaction or change by a hardener, etc., during the freezing or refrigerating, some of the additives may be added in dissolving and preparing stages. Thus, the equipment of the stage for dissolution and prepn. and the burden of operations are drastically decreased; in addition, the deterioration in the performance by the stagnation of the coating liquid is prevented and the quality is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a silver halide photographic light-sensitive material, and more particularly to the preparation of a light-sensitive emulsion coating solution.

[Background of the invention]

The production of silver halide photographic materials (hereinafter simply referred to as "photosensitive materials") usually involves the following steps.

1. First ripening (physical ripening or preparation) Production of silver halide grains 2. Desalination Removal of unnecessary salts 3. Second ripening (chemical ripening) Adjustment of sensitivity, gradation, etc. 4. Dissolution adjustment (preparation) Second ripened silver halide emulsion Add the required additives and adjust the concentration, viscosity, etc. Make the necessary adjustments as a coating solution and apply. Prepare the liquid.

5.111 Cloth, drying Apply the coating liquid and dry.

6. Packaging In the above steps, 112 steps are usually performed continuously,
Here, it is stored refrigerated, during which the conditions for the second ripening are determined.
A third second ripening step is performed.

In this case, (a) the second ripening and the next melting preparation are performed continuously, and the coating is further coated and dried.

(b) After the second ripening, the product is refrigerated, and during this period, it is inspected whether the desired performance has been achieved by the second ripening.

There is. Method (a) does not require equipment such as refrigeration, but the performance is inspected after the second ripening, which has a great effect on performance, after the coating is dried, and if the performance is not sufficient, there will be a large loss.

However, in the case of method (b), although the performance after the second ripening can be inspected, it is necessary to add various additives immediately before coating and drying, and to adjust the physical properties of the coating liquid to the optimal conditions for coating. , and in this work, it is necessary to keep the stagnation of the coating liquid as short as possible in order to not interrupt the coating and to prevent deterioration of the coating liquid performance.

In other words, even in the method (b), the fourth coating preparation step is currently a considerable burden in terms of equipment and work.

Furthermore, Eastman Kodak has issued a PCT patent No. 89106829, which discloses a method in which the emulsion after the second ripening, various additives, etc. are finely divided into a gel form, mixed, and prepared for dissolution in the fourth step. There is.

However, this method has problems such as an increase in the steps of subdividing and mixing, an increase in the chance of contamination with foreign substances, and an increase in the effort required for cleaning.

[Purpose of the invention]

In order to solve the above-mentioned problems, an object of the present invention is to provide a method for producing a silver halide photographic material that can significantly reduce the burden of dissolution preparation work and prevent deterioration of performance due to stagnation of the coating solution. That's true.

[Structure of the invention]

The above object of the present invention is characterized in that, in the preparation and coating of a silver halide photographic light-sensitive material coating solution, a silver halide emulsion coating solution containing various additives is refrigerated or frozen, and upon coating, it is rapidly dissolved and coated. This can be achieved by the method for producing a silver halide photographic light-sensitive material.

The details of the present invention will be further explained below.

Recently, coating techniques for silver halide photographic materials, such as
Advances in technologies such as multilayer simultaneous coating, high speed, and wide coating have been extremely remarkable.

Along with this, the type of coating solution and the amount of coating solution consumed per hour have increased significantly, and it has become quite difficult to supply the coating solution smoothly while minimizing the stagnation time of the coating solution. ing. Moreover, there are many kinds and amounts of various additives to be added, and the equipment and operations in the dissolution preparation process are considerably burdened.

On the other hand, in the case of the present invention, after the second ripening, various additives are added, the concentration is adjusted if necessary, and then refrigerated or frozen, so it is only necessary to dissolve the required amount at the appropriate time in the dissolution preparation process. It turns out.

Furthermore, by blending the refrigerated or frozen emulsion, a large amount of highly uniform emulsion necessary for mass production can be produced.

In the present invention, the method for dissolving the prepared refrigerated or frozen emulsion as described above is not particularly limited. A dissolution method, a reduced pressure steam method, etc. can be selected and used.

The silver halide emulsion used in the light-sensitive material of the present invention includes conventional silver halides known in the art, such as silver bromide, silver chloride, silver iodobromide, silver chlorobromide, silver chloroiodobromide, etc. Any material used in silver halide emulsions can be used, and there are no particular limitations.

Various silver halide emulsion preparation techniques and additives known in the art can be used in the light-sensitive material of the present invention. For example, various sensitizing techniques, couplers for color photosensitive materials, etc. Other additives are described in more detail in Research Disclosure, Vol. 176, I tem 17643 (1978).
18716(19)
(November 1979).

In the present invention, in principle, all additives are added after the second ripening and frozen or refrigerated, but if there is a risk of reaction or change during freezing or refrigeration, for example with a hardening agent, some additives may be added. may be added during the dissolution and preparation process.

For coating, supports and coating methods known in the industry can be used.

〔Example〕

In coating a color photosensitive material, a comparison was made between the case of simultaneous five-layer coating according to the present invention and the conventional method.

In the case according to the present invention In the case according to the present invention, after the second ripening, all necessary additives were added, a coating liquid was prepared so as to be dissolved at a predetermined temperature, and then refrigerated.

In the melting and preparation process, two melting tanks were used for each layer, a total of 10 melting tanks, and each of the two melting tanks alternately melted and coated at a predetermined temperature.

In the case of the conventional method, only the stabilizer was added after the second ripening and the mixture was refrigerated. All other additives were added in the pre-coating dissolution preparation step. In this case, in addition to two dissolution tanks for each layer, additive preparation or addition tanks for each layer are required, and the number varies depending on the photosensitive layer and the non-photosensitive layer, but is 4 to 10 types. Therefore, in the case of 5 layers, it is 5 times that amount.

Moreover, in order to minimize the stagnation of the emulsion, restrictions were placed on the dissolution unit, and the timetable was able to provide a method for producing a light-diffusing material.

It's something new.

[As mentioned above, in the case of the present invention, the refrigeration or freezing equipment becomes large, but since the second ripening can be carried out on a much larger scale than the pre-coating melting, the addition of additives can also be carried out in large quantities. The number of times decreases.

Furthermore, time constraints are eliminated and the workload can be reduced. Furthermore, blending is possible during refrigeration or freezing, making it possible to form larger batches and contributing to quality stability.

On the other hand, in the case of the conventional method, as mentioned above, there is a problem of stagnation of the emulsion, and a large amount of dissolution cannot be achieved.

Therefore, it is clear that the method is inferior to the method of the present invention in terms of quality, and is significantly inferior to the method of the present invention in terms of equipment and work.

〔Effect of the invention〕

Claims (1)

[Claims] In the preparation and coating of a silver halide photographic light-sensitive material coating solution, a silver halide emulsion coating solution containing various additives is refrigerated or frozen, and upon coating, the silver halide emulsion coating solution is rapidly dissolved and coated. Method of manufacturing the material.