SU38568A1 - The method of obtaining photosensitive layers using diazoanhydrides - Google Patents

Description

Patent No. 38567 describes a method for producing photosensitive layers using diazoanhydrides, consisting in that phenols, or naphthols, or aminonaphtol sulfroxyacids, together with the indicated compounds, can be introduced along with diazoanhydrides salts of copper, nickel, manganese, iron or mercury individually or in any mixtures.

The proposed method of producing photosensitive layers is a modification of the above and consists in the fact that instead of the salts of the listed metals in the photosensitive mixture together with the diazo compound (24g) i

nor mi. and a titanium salt is introduced with phenols, naphthols, or aminonaphtholsulfonic acids.

The blueprints obtained on the layers described in Me 38567 have a bright color that does not correspond to photographic purposes. Only layers of iron or manganese salts produce brown and black tones, but the copies obtained on them are poorly preserved and have insufficiently pure light . The authors found that, using titanium salts, it is possible to obtain neutral tones from brown to black, depending on the diazo compounds used and the azocomponents. The desired change in the tone of the copy can also be achieved by its subsequent treatment with salt of a different metal. In addition, the tone of a copy obtained on a layer containing a salt of titanium can be significantly changed by the action of a small amount of water (for example, wetting with a sponge or the action of moist air) on a copy developed by gaseous ammonia. In this way, a range of shades from yellow-brown to black can be achieved, and the prints do not have gloss. Depending on the duration of the water, one or another positive tone can be set. The copies are only slightly moistened, so that they do not need to be dried for a long time.

Example 1. Photographic barite or other paper is spread or impregnated with a solution that contains 100 parts of water: 2.5 hours. 1: 2: 4 diazaphthol-sulfonic acid, 2 parts of dichlorresorcinol, 4 parts of titanium-sh, potassium hydroxide.

After drying, the layer is cured, ayut is positive and developed by gaseous ammonia. After aeration, and sometimes washing with water, yellowish-brown copies are obtained.

In order to obtain a darker tone, copy a copy, for 1-2 minutes, in a dilute solution of blue vitriol. The color of the copy goes into a reddish brown. If it is preferable to get a black-brown tone, the copies are washed with water shortly before being placed in a copper bath.

Example 2. A celluloid film is moistened in a solution consisting of: 9 wt. including sodium salt of 1-diazo-naphthol-4-sulfonic acids, 1.8 weight. including phloroglucin, 24 wt. including titanium-oxalic acid potassium in 1000 parts of water.

After the film is illuminated under the positive and appears in gaseous ammonia, a violet copy is obtained, which, when exposed to air, turns into a neutral brown-black color. This transition can be accelerated by moistening the copy with water vapor, and sometimes at elevated temperatures.

Example 3. Slab ordinary paper with a solution of 15 wt. including sodium salt of 1-diazo-2-naphthol-4-sulfonic acids, 3 weight. including phloroglucin, 20 wt. ammonium tithio-fluoride in 1000 parts of water.

After illumination of the bootyag under positive and the appearance of ammonia, violet positive is obtained, which changes to neutral black after evaporation of the ammonia.

Example 4. A photosensitive paper made according to example 1 by means of 1-diazo-2-naphthol-4-sulfonic acid, dichlorosorcinol and titanium-oxalic-acidic potassium is illuminated under positive and developed with ammonia gas. The yellowish-brown copy obtained after ventilation is subjected to a short jet of water vapor for a short time, and it assumes a neutral dark brown color. If the copy is not processed with water vapor, but moistened with a sponge, a black-brown color is obtained.

Example 5. A mixture of 5 parts of 1-diazo-2-naphthol-4-sulfonic acid sodium salt, 4 parts of dichlorresorcinol, 10 parts of titanium oxaloxy-acidic potassium, 100 parts of gelatin and 1000 parts of water are applied to a raw photographic paper, illuminated under positive and exhibit ammonia gas. The copy thus obtained is exposed to humid air. Depending on the degree of humidity and the duration of exposure, you can get the whole range of shades from yellow brown through a neutral brown to a black and brown tone.

With the use of other diazo compounds or other azocomponents of coloring agents, the tone of the copies, although changes, however, in this case, various transitions of shades can be obtained,

The subject of the patent.

1. Acceptance of the method indicated in patent No. 38567, characterized in that instead of the salts indicated in paragraph 3 of the above patent, the titanium salt is introduced into the photosensitive mixture together with the diazo compounds and the azocomponents indicated in the above patent.

2. Acceptance of the method indicated in claim 1, characterized in that the diazocopy obtained by using titanium salts is further treated with a solution of a salt of another metal.

3. Acceptance of the method specified in paragraph 1, characterized in that the production of diazocopy, when using titanium salt, is affected by a small amount of water or moist air.