SU374572A1 - - Google Patents

Description

MANIFESTING PASTE FOR DIFFUSION PHOTOGRAPHIC PROCESS

one

The invention relates to high-speed photographic processes, in particular to "dry processes, providing an image acquisition without the use of solutions.

These include, first of all, a single-stage process, which allows to obtain a positive image as a result of the dissolution and diffusion of silver in a time not exceeding 2 minutes.

The main elements of such a photographic system are a negative, positive material and a pasty developer.

It is known that for enhancing the tone of the image into the developing paste containing the developing and fixing veins, the RBO is also mercapto derivatives of various heterocyclic compounds, in particular tetrazine, containing the msrcapto group. However, in diffusion processes such as the Moment of Compound of This Type do not provide a blue-black or neutral tone of the image.

The purpose of the invention is to improve the tone of the image and increase the photosensitivity.

This is accomplished by the guide in the treatment paste as a toning agent.

2,

mercapto or sulfamide substituted triazolopyrimidine of the general formula

ft,

R | nn

N

ten

where Ry is SH, NHSOsRs;

Ra, Rs, R4 is HIGH alkyl, aryl, or other substituents; Rs is aryl or substituted aryl.

Example 1. In a phenidop-hydroquinone treatment paste containing, on 100 g of a paste, 2 g of hydroquinone, 0.1, g of fepidone, 5 g of anhydrous sodium sulfite, 2 g of thiosulfate, 4 g of sodium hydroxide, p 0.0024 g of 1-phenyl-5 α-mercaptoterazole was administered 2-n-heptyl-4-mercapto-6-methyl-1, 2,4-triazolo-2,3-a-pyrmpdin (formula I, Ri SH, R2 H,, R4 HC7H, 6) at a concentration of 15 -10 gmol / g Ag.

An exponential negative photographic paper of the type "NM" is carried out on an FSR-41 sensitometer. The processing time is 2 min at 20 ± 2 ° С. Sensitometric characteristics (Somtn-i o, 2, Lg, DO,) are determined from the positive image. The tone of the image is evaluated by the ratio at Dxl, 0 and, 5. Measurement of the densities produced by the FM-58 spectral photometer behind the blue (Atah 445 NM) and red (Yata 665 NM) filters. Test data are given in table. 1. Table 1

From the data given in table. 1, it follows that in the presence of 2-n-heptyl-4-mercapto-6-methyl-1, 2,4-tr1iazolo-2,3-a-pyrimidip, the image tone becomes neutral, and the photosensitivity increases by 2.3 times.

Example 2. In metol-hydroquinone processing, boiled paste containing 2 g of metol, 1 g of hydroquinone, 3 g of anhydrous sulfite from the data given in Table. 2 follows. that in the presence of 2-n-heptyl-4-mercapto-6-me-15 thyl-1,2,4-triazolo-2,3-a-pyrimidine, the tone of the image becomes neutral, and the photosensitivity is increased by 2 times.

From the data given in table. 3, it follows that the presence of 2-n-heptyl-4-mercapto-6-methyl-1, 2,4-triazolo-2,3-a-pyrimidine in the processing tin and 1-phenyl-5-mercantoterazole in the receiving layer gives the neutral tone of the image, the photosensitivity is increased 2.5 times.

Pu, 2.5 g of thiosulfate, 4 g of sodium hydroxide and 0.0024 g of 1-phenyl-5-mercaptoterazole are administered 2-n-heptyl-4-mercapto-6-methyl-1,2,4 - triazolo 2, 3 -a-pyr; imidine (formula I, Ri SH, R2 H, Cs CH3, R4 HC7Hi5) at a concentration of 15-10-3 g-mol / g Ag. Test data are given in table. 2

table 2

Example 4. Isntavi was carried out analogously to example 2. In the metol-hydroquinone treatment paste, 4- / g-toluenesulfamido-6-met1-IL-1, 2,4-triazolo-2,3-a-pyrimidine (I, H, MH502CbN4CH3 , R2 H,,) fi concentration of 15-10 g-mol / g Ag. Test data are given in table. 4. Example 3. The tests were carried out analogously to example 2, but 1phenyl-5-mercaptoterazole was introduced into the receiving layer at a concentration of 5-10 g-mol / g Ag. Test data are given in table. 3. Table 3

Table 4

From the data given in table. 4, it follows that in the presence of 4- / g-toluenesulfamido-6-methyl-1, 2,4-triazolo-2,3-a-pyrimidine the image tone is neutral, the photosensitivity is increased 1.3 times.

Subject invention

A developing paste for a diffusion photographic process, comprising a developer, fixing and tinting substances, characterized in that, in order to improve the tone of the image and the increase in sensitivity, as a toning substance

MERCAPTO- OR SULF-AMIDUM substituted triazolo-2,3-a-pyrimidine general formulas

where RI is Sl, NHSOaRs; R2, Kz, R4 is a higher alkyl, aryl, or other substituent; Rs is aryl or substituted aryl.