KR0130174B1 - Silver haliden photosensitive material - Google Patents

Abstract

The present invention relates to a method for manufacturing a photo sensitive material for a low sensitive silver printing plate by using a ultraviolet rays. In the method, a p-toluenebenzenesulfurnatensodium salt and a sodium chloride are added to a phenylcarbamyl gelatin solution and a polyvinylpyrrolidon mixing solution and a photo emulsion is made at pH 4.6 and 40 deg C by a single injecting method. while maintain a pAg 8.4 in a mixing solution of a sodium chloride, a kalium chloride, and a lithium chloride and a silver nitrate at a pH 4.6 and by a double injecting method, a photo sensitive material for a low sensitive silver printing plate by using a ultraviolet rays is obtained. The photo sensitive material includes a silver chloride of 100% and a particle size of a silver chloride therein is 0.08-0.18um.

Description

Manufacturing method of photosensitive material for low-sensitivity silver halide printing

1 is an enlarged photograph showing the size and shape of the photoemulsion silver halide particles of the present application.

2 is a graph showing the size distribution of the photoemulsion silver halide particles of the present application.

The present application relates to a method for producing a low-sensitivity silver halide printing photosensitive material using ultraviolet light in a bright room such as a fluorescent lamp.

Photo emulsions that are sensitive to conventional light generally produce silver halides of fine particles in photographic gelatin solutions.

The method for producing the silver halide particles with low-sensitivity photographing agents is described on page 62 of Kang Tae-seong, Low-Photo Chemistry (1987, Photographic Publications), and there are some photosensitive materials for photographing using visible light. There is a photosensitive material which can obtain an image by forming a finely blackened dot after exposure using ultraviolet rays in a bright room. This photosensitive material requires low sensitivity, high contrast and high resolution.

There are various particle formation methods, but conventionally, in order to obtain fine particles, the gelatin solution is acidified to produce particles having a particle size of 0.2 to 0.6 탆 by a single or double injection method.

Conventional particle generation methods are already known methods, for example, U.S. Patents 2592250, 3276877, 2222264, 3206313, 3775126, J. Photogr. Sci., Pp. 242-251 (1964). It has been published in the Silver Oxide, Silver Bromide, Silver Chloride or Silver Chlorobromide (AgBrCl) mixtures, with an average particle size of 0.15 to 0.4 μm, finer particles with a size distribution of 0.1 to 0.25 μm, and the proportion of silver chloride to 80 to It is 87% by weight.

The present invention develops a low-sensitivity silver halide photosensitive material by a novel method not disclosed in the above patents and magazines. In other words, p-toluenebenzenesulfonate sodium salt and sodium chloride solution are mixed with a phenylcarbamyl gelatin solution and a polyvinylpyrrolidone solution and stirred to maintain a constant pH and the temperature of the solution. 100% silver chloride fine particles having average particle size of 0.08 ~ 0.18㎛ at pAg 8.4 are prepared by double injection method of mixed solution of chloride and silver nitrate solution.

The photo-emulsion agent prepared as described above is subjected to washing with water by a precipitation method, which is a known method.

For example, the sulfur sensitization is described in US Patent 1574944, 2278947, 2410689, 2728668, 3656955, 3, 2, 3, 2, 5, 6, 4, 3, 6, 5, 5, 4, 4, 4, 4, 4, 9, 4, 4, 4, 4, 4, 9, etc. Is recorded.

Plasticizers (polyoxide-based), film-forming agents (vinyl sulfate-based), surfactants (anionic, non-ionic), antistatic agents (thymol-based), image stabilizers, sensitizers, which are already known photochemical additives in chemically-sensitized emulsions The antihalation layer is applied by adding a sorbent, a rhodanine-based, a pH adjusting agent, an antioxidant (phenol-based), a thickener (polystyrene-based), a development accelerator (polyoxide-based), a stabilizer (benzotriazole-based), and the like. The coated polyester film is coated and dried with the protective layer using the methods described in Making and Coating Phtographic Emulsion (between The Focal Press, 1964) and Modern Coating and Drying Technology (VCH, 1993).

Since the photosensitive material manufactured by this method is formed with a finer grain structure than the conventional material, the photosensitive material for printing and printing having a high contrast, high resolution photographic characteristic is obtained after the blackening dots are fine after the photographing phenomenon. It can manufacture.

For example, it will be described in detail as follows.

Example

Photo emulsion manufacturing process

To 1,000 ml of 1.5% by weight phenylcarbamyl gelatin solution and 0.5% by weight polyvinylpyrrolidone mixed solution, 0.002 mole of p-toluenebenzenesulfonate sodium salt was added and 0.5 mole of sodium chloride was mixed and stirred to a temperature of 4.6 and a temperature of 40 ° C. An emulsion was prepared by injecting 1 liter of a solution of 0.45 mol / l of silver nitrate in 1 minute, and mixed with 1.1 mol / l of sodium chloride, 0.1 mol / l of potassium chloride, and 0.05 mol / l of lithium chloride, and 1 mol / l of silver nitrate. 400ml is injected in a double injection method for 20 minutes to maintain pAg 8.4, but the first 10 minutes at a rate of 10ml per minute during the last 10 minutes at three times the initial injection speed of the particles as shown in Figs. An emulsion having a size distribution of 0.08 to 0.18 mu m was obtained. The emulsion is washed with a precipitation method and then chemically aged and an additive is added to prepare a photographic emulsion.

Uncoated process of polyester film support

The photo emulsion obtained in the previous manufacturing process is applied to the back side of the antihalated polyester film support with a protective layer so that the amount of silver per m 2 is 0.5 g. Manufacture.

Claims (3)

P-toluenebenzenesulfonate sodium salt and sodium chloride were added to the mixed solution of phenylcarbamyl gelatin and polyvinylpyrrolidone, and the solution was prepared by single injection at pH 4.6 and 40 ° C, and then mixed with sodium chloride, potassium chloride and lithium chloride. A method for producing a photosensitive material for printing a low-silver silver halide printing plate having 100% silver chloride of polar fine particles having a particle size distribution of 0.08 to 0.18 μm by a double injection method while maintaining pAg 8.4 at a pH of 4.6 with a silver peroxide solution. 2. The method of claim 1, wherein the phenylcarbamyl gelatin is 1.5 wt%, the polyvinylpyrrolidone solution is 0.5 wt%, p-toluenebenzenesulfonate sodium salt is 0.002mole, sodium chloride 0.5mole, nitric acid is 0.45mole / l A method for producing a low-sensitivity silver halide printing photosensitive material for printing. The low-sensitivity silver halide printing plate photograph of claim 1, wherein the mole concentrations of sodium chloride, potassium chloride, and lithium chloride are 1.1 mol / l, 0.1 mol / l, and 0.5 mol / l, respectively, and the silver nitrate solution is 1 mol / l. Method of manufacturing photosensitive material.