SU1030764A1 - Gelatine emulsion layer hardening method - Google Patents

Abstract

A METHOD FOR BROADCASTING OF GELATINES OF EMULSION LAYERS by introducing a tanning agent into the emulsion is also distinguished by the fact that 1,1-dimethoxy.-butene-2-al-4 is used as a tanning agent to improve the physical, mechanical and optical properties amount of 0,0050, 8 mol per 1 kg of air-dry gelatin. cl

Description

The invention relates to methods for the tanning of gelatin emulsion layers and can be used in the micrographic industry. There is a known method for tanning gelatin emulsion layers by introducing a compound of the general formula X - (CH-CH) t-X, gd into the emulsion of the tanning agent. X - CHO or CH (OCA% Y and 2 or 3, in the amount of 0.005-0 4 mol per 1 to air-dry gelatin 1. However, gelatin layers hardened by this method have insufficient strength and have an absorption in the tic range, which limits the use ways in photography.; Aim and gain - improvement of phi: mechanical and optical properties of zadublenny emulsion layers. The goal is achieved that according to the tanning method they desire new emulsion layers by introducing dubitel into the emulsion using 1,1-dimethoxy-butene-2- as a tanning agent. al-4 in the amount of 0.0050, 8 mol per 1 kg of air-dry gelatin. Photographic emulsion of 1,1-dimetho si-butene-2-al-4 is usually added to gelatin and halogen-silver usually in the form of its solutions in methanol , ethanol, acetone or their mixtures with water. The tanning process is weakly dependent on the acidity of gelatin emulsions in the pH range from 3 to 10. The best results are obtained for the emulsion pH 4-8. The tanning agent does not affect the viscosity and acidity of gelatin emulsions. 1,1-Dimethoxy-butene-2-al-4 does not affect the photographic characteristics of gelatin halogen-silver emulsion layers. The tanning agent xopoijio is combined with stabilizing optical sensitizers, plasticizers, pH regulators, dyes, or compounds that form them. Gelatin emulsions may also contain gelatin graft copolymers, water-soluble cellulose derivatives, synthetic polymers, such as polyvinyl alcohol, polyvinyl acetate. The gelatin layers, which are sublimated by the proposed method, are stable in acidic (pH 1.5} and alkaline (pH 12) solutions for at least 6 hours at 30 ° With no change in the physicomechanical properties. The layers are transparent over the entire optical range (380-720 nm /. 1,1-Dimethoxy-butene-2-al-4) are also used in the compositions for: chemically co-photographic processing of gelatin layers containing pro bleaching, fixing and similar substances in aqueous solutions. For example, for tanning gelatin halogen-silver emulsion layers of 1,1-dimethoxy-butene-2-al-4 is introduced in an amount of 0.1-1.0 g / l of aqueous a solution containing 250 g / l sodium thiosulfate. The lower limit of the content of tanning agent in the emulsion (o, 005 mol / kg of gelatin) is due to the minimal tanning effect of the layer. With a lower content of tanning agent (for example, O, 003 mol /} g of gelatin) measurement error controlled values do not allow to distinguish between pushed and unclaimed layers .. For In the known method, such a critical concentration is a tanning content of 0.005 mol / kg gelatin. For the proposed tanning agent, the concentration is 0.003-0.005 mol / kg gelatin. When the content of the tanning agent in the emulsion is more than 0.8 mol / kg of gelatin, there is no improvement in the physicomechanical properties due to the limited number of active gelatin groups with which the tanning agent interacts. The introduction of an excess tanning agent is undesirable, since the residue of the tanning agent can be oxidized, polymerized, which can lead to deterioration of the photographic material. For example, the polymerization of a tanning agent can disturb the homogeneity of the gelatin layer during storage of the material, which will cause a drop in plasticity, transparency, etc. Example. 1,1-dimethoxy-butene-2-a-4-4 is added in gelatin aqueous emulsions with a pH of 6.2, containing 50 g / l of gelatin, in such a quantity that the tanning agent is introduced 0.005-0.8 mol per 1 kg of gelatin, for the introduction of a dubitel into the emulsion, is used in the form of a solution with a dubitel content of 50 g / l. The solvent used is ethanol, methanol or a mixture of ethanol and water in a volume ratio of 1: 1. The resulting emulsions are applied to flat glass laminated with an adhesive composition, the emulsion is dried with air heated to 40 ° C and subjected to tanning at 45 ° C with a moisture content of 45%) and 55 ° C (relative humidity 43%). In a similar way, gelatinous layers are made and subjected to tanning using the known tanning agent, 2,4,6-octatriene-1, 8-dialdehyde, which is introduced into the emulsion in the form of an ethanolic solution with a tanning content of 10 g / l. The strength of the gelled gelatin layers is determined after. 1 minute of swelling in distilled water at 20 ° C by measuring the load required to fully immerse into a layer of a steel ball with a diameter of 6.35 mm (with a dry gelatinous layer thickness of 6 µm). The temperature of the onset of deformation of the flattening of the platinum layers in distilled water is determined visually by the deformation of the graphite grid applied on the dry layer at a heating rate of 1 C / min, starting from 20 ° C. In the same way, the temperature of the onset of deformation of the dented layers in an alkaline sulfite solution containing 1.1 g / l of sodium hydroxide 50 g / l of sodium sulfite and water to 1 l is determined. At the same time, the optical density of the dry gelled gels is measured in the visible region of the spectrum. For this purpose, use gelatin layers with a thickness of 6 microns, made by known and proposed methods.

Table 1 shows the physicomechanical and optical properties of the gelled gelatin layers, and the sum is a very transparent layer in the visible: the spectrum region is intentional on the instrument (source with a color temperature).

From the data in Table 1, it can be seen that the proposed method of tanning gelatin layers by introducing 1, l-dimethoxy-buten-2-al-4 into them, compared with the known, by increasing the strength of the product, their stability in aqueous solutions and reduce staining of layers (increase transparency). Similar results are obtained when bilding gelatin emulsions with a pH of 4.1 and 8.95.

.Example2. In molten high-fine-grained high-resolution silver halide gelatin photographic emulsion, synthesized in a known manner C2j and containing silver halide microcrystals with a size of 0.05-0.07 μm, stabilizer 1-phenyl-5-mercaptoterazole, methanol and spectral sensitizer of the formula

CHgCHgOH

C - N

I C S C-N

ngshnsnz

1,1-dimethoxy-butene-2-al-4 in the amount of 0.0050, 8 mol / kg gelatin are introduced to increase the sensitivity of the emulsion to the wavelength range 400420 nm, similarly

Example 1. An emulsion with a pH of 5.8 was applied to a glass substrate, dried, and subjected to tanning as in Example 1. As a result, a photosensitive material was obtained in the blue region of the spectrum of 400420 HMJ. Similarly, photomaterial without a tanning agent is produced, as well as with the known tanning agent 2,4,6 octatriene-1, 8-dialdehyde. The prepared photographic materials are tested for the measurement of physicomechanical parameters after chemical-photographic processing in a phenidone-hydroquinone developer (pH 11.3) 5 minutes), water washing (0.5 minutes}, fixation (pH 11.3, 5 minutes), water rinsing (0.5 min), fixation (pH 4.8, 8 min. And final water rinse | 10 min, and also after chemical-photographic treatment in the mode with image reversal (first, appearance, rinsing, bleaching, rinsing, clarification, washing, exposure, second development, washing, fixing,

final rinsing; total processing time 38 min). The photographic characteristics of the materials are investigated by exposing the photo. layers for 30 s, standard

chemical-photographic processing of materials and measurement of diffuse optical densities of sensitograms. Table 2 shows the physicomechanical properties of the gelled gelatinous halogen-silver emulsion layers. In table 3 - photographic characteristics of photographic materials.

As can be seen from Tables 2 and 3, the physicomechanical indicators made by the proposed method (with tanning agent 1, l-dimethoxy-buten-24 lem-4) are higher for photo-layers than for photo-layers made using well-known tanner. The photographic characteristics of photo-layers of 1,1-dimethoxy-butene-2-al-4 does not affect, whereas using a well-known dubitel a photographic material that is completely transparent in the optical range cannot be produced.

(Table 3).

.Table 1

Note:

Famous

T a

Teinneparypa faces the onset of layer deformation in distilled water; t2. temperature of the onset of deformation of the layer in alkaline sulfite solution.

Known Table

Claims (1)

METHOD FOR DUPLICATION OF GELATIC EMULSION LAYERS by introducing a tanning agent into the emulsion, characterized in that, in order to improve the physicomechanical and optical properties of the tanning layers, 1,1-dimethoxy-butene-2-al-4 in an amount of 0.0050 is used as a tanning agent , 8 mol per 1 kg of air-dried gelatin.