SU1024962A1 - Polyelectrolyte complex as spectral sensitizer of photographic emulsions - Google Patents

Abstract

A polyelectrolyte complex of the formula V CHj-U-lCHjlef ®An® in CBj where fV 1 aiC ° . ,, SC-CM cv taJ f i fHeh t so; where n Л0-60 as a spectral sensi-d bilizer of photographic emulsions. Bd 4 O) 1C

Description

This invention relates to polyelectrolyte complexes containing an anion-active group that can be used in spectral sensitization of halogen-silver emulsions. Polyelectrolyte is known to have the following formula HsC Sis h - "x x CHg-N-CCH2) CH 2 ClB where n 40-60, which is obtained by elution of N, N, N, N-tetramethyl-1, 6-hexamethylenediamine and 2, 4-dimethyl-M-xylylene dichloride in acetone with periodic addition of water during the synthesis. Polyelectrolyte is a white solid, hygroscopic, soluble in water, methyl alcohol, dimethyl sulfoxide, slightly soluble in ethanol and dimethylformamide.

cH2- (SNg) b-rt “. f

CH3 A known polyelectrolyte is used as flocculant of various suspensions, a bactericidal agent, a regulator of zinc cathodic deposits, however, it does not manifest itself as a spectral sensitizer of photographic emulsions. The spectral sensitizer of photographic emulsions is known: pyridium salt 3 3-di- (-sulfopropyl-, 5., 5-di (thieno-3, 2 -9-ethylthiacarbocyaninebetaine 2Ji. The main drawback of this sensitizer is the low sensitivity of emulsions obtained With its application. The purpose of the invention is to obtain a polyelectrolyte complex, which is a spectral sensitizer of photographic emulsions, which allows to increase their photosensitivity. The goal is achieved by the structure of a polyelectrolyte complex rmuly:

where n 40-60.

The method of obtaining the polyelectrolyte complex of this structure consists in the fact that an aqueous solution of poly (2,4,4-dimethyl-MgxylneH-N, N, N. M-tetramethyl-1, 6-hexamethylenediammonium chloride) is mixed with an aqueous-alcoholic solution containing an equivalent amount of pyridinium salts 3,3-DI--sulfopropyl-4. 5, 4, 5-Di (thieno-3. 2V-9-ethylthiacarbocyaninebetaine. The content of components in solutions is 5 U mol / l. The formation of a complex of polyelectrolyte with the original spectral sensitizer is observed by changing the intensity of the characteristic absorption bands of the spectrum of the sensitizer in the visible region.

The polyelectrolyte complex eeoAfl 8 as a spectral sensitizer into a photographic emulsion before watering it on a substrate ..

FIG. Figure 1 shows the curves for the formation of a polyelectrolyte complex of the sensitizer: curve 1 — the spectrum of the matrix-unbound sensitizer i curve 2 — the spectrum of the polyelectrolyte complex of example 1. in fig. 2 shows the curve of the structure of the polyelectrolyte complex of the sensitizer; G is the saturation curve for the jp band of the sensitizer. P p and p 1. Preparation of a poly-electrolyte complex of a spectral sensitizer 0.01 g of pyri, evo salt 3f zdi -) - sulfopropi 5, V, (thieno-3, 2) -9-ethyl thiacarbocyaninebetaine is dissolved in 9 ml of an alcohol – water mixture (irtO). The resulting solution is added with 1 aqueous solution containing. 0.0 poly (2, -dimethyl-l-cnlylene-KM H-tetramethyl-1, 6-hexamethylenediamonium chloride) (p 60). A polyelectrolyte sensitizer complex formed is confirmed by changing the type of spectrum of the original event (Fig. 1). The composition of the complex, determined by the saturation method, corresponds to 2 moles of the sensitizer per elementary element of the pre-cast (Fig. 2). Example 2 A photographic emulsion is synthesized according to the following recipe .. P t in o r T () Potassium bromide, g Potassium iodide. 0.171 g Potassium nitric oxide 0.31 g Gelatin 1.1 g Distilled water. 1 мл ml bath (25 ° C) P a C T V O p 2 Silver nitrogen 5 .39 g sour Ammonia 255 amp To fully ammonia Sodium nitrogen, 31 g sour Distilled water Up to 90 ml bath () R a t o r 3 Silver nitric3 .32 g sour Ammonia Up to complete amiNirov Sodium nitrate Distilled water Solution Sodium benzenesul0, ij5 g acidic water Distilled water 50 ml bath P-a with about 5 p Sulfopolystyrene D10% aqueous solution) P and T in O p 6 Acidic acetic aqueous solution 12 ml Solution 2 is introduced into solution 1 instantaneously, solution 3 is introduced into the emulsion within 10 minutes. Then the solution is introduced and. Solutions 5 and 6 are introduced into the emulsion to precipitate a solid phase of silver halide. After washing the precipitate, solutions 7, - -9 are added to it. :.; -. /,: Pa s t in o p 7 Gelatin highly active 20 g Distilled water 30 ml P a t in p 8 Hydrochloric acid (0.0520% solution) 0.3; ml of raw material in ammonium rhodium (water-0.3 ml solution) During the chemical ripening process, the emulsion is irrigated onto the plates. Sensitometric tests are carried out on a sensitometer, the samples are observed in a GOST-1 developer, fixed in acidic fixer, optical densities are measured on a densitometer. PRI me R 3. The tests are carried out according to Example 2. The difference is that a spectral sensitizer — Liridinium salt 3 — is introduced into the emulsion before the polyvrm on the plate. 3-DI-j-cylf b-propyl-5, 5-Di (tyeno-3 2 ) -9-ethylthiacarbocyanine bentaine in the amount of mol / mol Ag. The results of sensitometric tests are given in table. 1. PRI me R. The tests are carried out according to Example 2. The spectral sensitization of the emulsion is carried out by introducing into it the polyelectrolyte complex of the pyridinium salt 3 3-di-} - sulfopropyl-4, 5. 5-di (thieno-3, 2) -9-ethylthiacarbocyaninebetaine in an amount of 5 mol; / / mole Atf. In Teyul 1 shows the results of sensitometric tests of photo layers.

Table 1

P

In tab. 2 shows the comparative data on the change in the sensitometry. As in Example 3

properties of emulsions synthesized according to examples 3 and t.

Table 2

Famoussensi bilizator

2,111,4

 1.32bS

0,891,22 JTogu photosensitivity () and contrast ratio of photoflo, exposed at a color temperature of 6500®K; S | t (fl У uoi - photosensitivity (s 0.8) contrast ratio of photoflo exposed to red light filter, SjKip photosensitivity (S о, gc) and contrast ratio of photoflow exposed to yellow light filter; Yu - density of veil.

From Tables 1 and 2, it follows that sensibipi-15 The proposed sensitizer, the removal of photo-emulsion matrix communications, annihilates sensitized light | With sensitizers, the sensitivity is increased by a factor of 2–3, and the sensitivity by a factor of 2–2 allows Vennup sensitivity to be 2–2.5 compared to the well-known basic object. times;

D 2.5

8 Continued table. 2

(2

Me nor

fPu2.f

f1 / e.2

4t

hay

Claims (2)

zatsya emulsions matrix-linked sensitizers can increase photosensitivity in 2-Zraza compared to a known base object. it licks sensitized photosensitivity by 2-3 times, and its own sensitivity by 2-2.5 times; 500 1024962