SU706815A1 - Cu-based physicai developer - Google Patents

Description

(54) COPPER PHYSICAL DEVELOPER

one

This invention relates to a copper physical display that can be used to process photographic materials on. titanium dioxide base ..

A known physical developer: for photographic materials based on titanium dioxide, including a salt of copper, as an example, Co (N05) 2 ЗНуО or CuSO. ., ascorbic acid, complexing agent - 2-aminoethanol, sodium sulfite and water 1.

The disadvantage of this product is that the exposed photographic materials processed by it possess unsatisfactory low sensitivity and optical (image density).

The purpose of the invention is to increase the sensitivity of photographic materials and optical image density. This goal is achieved by the fact that copper physical developer for photo materials based on titanium dioxide, including copper salt, ascorbic acid, a complexing agent, sodium sulfite and

, water, as a complexing agent contains a salt salt and triethanolamine and additionally contains sodium chloride potassium, thiourea or sodium thiosulfate, or sodium sulfide and sodium hydroxide in the following ratio of components, mol / l

0.0.8-0.16 A. Copper salt

0

0.12-0.36

Segnetova salt

0.15-0.075

Triethanolamine

0.04-0.08

Sodium sulfite

0.14-0.16

,Sodium hydroxide

Chloride, sodium

five

0.03-0.085

or kali

Thiourea or

sodium thiosulfate, or sul-.

0,0008-0,008

feed feed

0 b. Ascorbian

0.55-0.85

acid

Boiia Up to 1 l

Example. Prepare five images: 5. tsov about wittel.

The compositions of the proposed manufacturers are given in Table 1.

Phbtographic characteristics

(sensitivity S.-VT) density and contrast. °) the layer photographic characteristics of the layers. Photo layers are prepared by pouring on a glass substrate a suspension in the amount of 0.5 l / m, containing 20 g / l "l-Oa in 5%,: aqueous solution of polyvinyl alcohol. Ag ions in the amount of 1-10 g / C1 are introduced into the suspension before irrigation in the form of the salt of Ag-NO. cm-v Sensitivity, contrast,

Table 1

Tables shown in the proposed copper-ascorbic developer are given in Table. 2,

Table2 maximum density is determined by characteristic curves that are plotted on a time scale based on sensitometric tests,: Best results are obtained with the introduction of chloride ions and thiourea. When replacing thiourea with Ncn (z & photographic characteristics (BfAf) does not change, but the developer becomes less stable. When sodium thiosulfate is introduced, the developer is also less stable and the layers are 2-3 times less sensitive than with the introduction of thiourea .. How It follows from Table 2, the processing of the proposed photo-based photodioles based on dioxide. Titanium will increase the photosensitivity of the body by 10,000 times, increase the maximum optical density of the image, as well as increase the contrast ratio. Copper physical developer for titanium dioxide-based photographic materials, including copper salt, ascorbic acid, complex formation agent, sodium sulfite and water, in order to improve the photosensitivity of photographic materials and Optical density of the image, it contains segnevate salt and triethanolamine as a comminuent forming agent, and additionally contains sodium chloride or ka, tyom6- or 1 sodium thiosulfate, or sodium sulfide and caustic soda. The following ratio is Komponen, mol / l. Copper salt O., 08-0., 16 Segnetov salt 0.12-0.36 Triethanolamine 0, Sodium sulfite 0.04-0.08 Caustic soda 0.14-0.16 sodium chloride . 0.03-0.085 or potassium Thiourea or sodium thiosulfate, or sodium sulfide 0.0008-0.008 Ascorbic acid: 5 5-O, 85 acid Water Up to 1 liter. Sources of information, taken into account in the case of espermatisation, US Patent 3730721, 96-48, published. 1973 (prototype).