SU890354A1 - Lignt-sensitive material for direct obtaining of images - Google Patents

Description

The invention relates to photosensitive materials that do not contain silver halides, and can be used in chemical-photographic industry for the manufacture of photographic materials. A photosensitive material is known, consisting of a substrate and a photosensitive layer comprising silver bromide and tin dioxide. The photosensitive layer of this material is produced by sputtering the indicated components onto the electrolyte substrate in vacuum. The material is sensitive to ultraviolet light, under the action of which a direct visible image is obtained. The disadvantage of this material is the need to use expensive silver in it. The closest to the proposed light-sensitive material is prior to direct imaging. consisting of a substrate and a photosensitive layer made of a molybdenum complex of the structural formula (CH3) ,, 0. B lAoOj- This material is photochromic, i.e. under the action of UV radiation, it changes color from white to red-brown 2j. Under the action of heat or when the exposed material is stored at room temperature, the image on such material becomes discolored, which makes it impossible to use this material to make copies with a stable, stable image. The purpose of the invention is to increase the stability of the image and increase its maximum optical density. This goal is achieved by the fact that in a photosensitive material for direct imaging, consisting of a substrate and a sensitive layer made from a molybdenum complex, the latter used a molybdenum complex with an amino acid of structural formula I, II or III:

() I

tAo, 0 (). U

° ffl () and

The molybdenum complex of structural formula 1, II, or 111 is prepared as follows.

Take a sample of amino acids - glycine, alanine or spillage in the amount. (7 M and dissolved in a minimum amount of 1 N. HC. A portion of g of sodium molybdate NaMoij O -HnO 2-10 M is dissolved in 10 ml of water. The solutions are mixed and 6N hydrochloric acid is added to pH i. The mixture is boiled for several minutes, the precipitated precipitate gradually dissolves. After cooling, small crystals of white complex precipitate. The precipitate is filtered and washed with 0.1N hydrochloric acid, water, ethanol and diethyl ether. The powder is dried for 24 hours. vacuum at room temperature.

The photosensitive material is prepared either by pouring onto a podlozkka (boom, film, glass) a solution of a binding agent, for example polyvinyl alcohol, in which the photosensitive compound is dispersed, or by impregnating the substrate (paper, saponified acetate film) with a photosensitive compound solution. located directly on the substrate. However, in this case, the photosensitive layer is characterized by insufficient strength, therefore, it is desirable that the molybdenum complex be deposited on the substrate as a dispersion in a binder.

In order to obtain an image, the material is exposed to the light of a lamp of the type PRK or DRSh. The time required to obtain a good quality image is 10-60 seconds.

The image obtained on the proposed material has a gray-blue color, the maximum optical density of 0.8 | resistant to temperature. Heating at 150-200 s does not reduce the optical density.

Example 1. Weights (2 g of the molybdenum complex of structural formulas 1, II and III are dissolved in a minimum amount of 1N hydrochloric acid. The resulting solutions are applied to a glass substrate and dried at T 100 ° C,

The obtained material samples are exposed to a PRK-2M lamp at a distance of 25 cm for 20 seconds through a photomask and a negative blue image is obtained.

The properties of the samples and the images obtained on them are tabulated.

Example 2. In a solution of the molybdenum complex obtained in Example 1, a sheet of paper is impregnated in

over, 4 min and dried. Further operations to obtain images such as in example 1.

The properties of the samples are summarized in the table.

Example 3. Preparing a PES solution. For this, 5 g of PES is dissolved in hot water, kept for 6 hours at and then cooled to normal room temperature. A suspension of a molybdenum complex of the formulas 1, II or III is introduced into the obtained solution, dispersed and poured onto a glass substrate. The image is obtained analogously to example 1.

The properties of the samples are summarized in the table.

In the dry layer for the compound in formula i, the amount of PVA is 10 parts by weight. on one part of the complex,

for compound II, 5 parts by weight for one part of the complex, for the connection .111 - 1 weight.h. on one part of the complex.

As follows from the above table, a stable colored image can be obtained on the proposed material, the maximum density of which does not change even when the material is stored for 10-60 minutes. Obtaining an image on the proposed material is only echoed by irradiating the material without or additional chemical and photographic processing, which makes it possible to use this material in reprography.

1 2.5- 10 0.7 0.8 It 2-10 0.8 Oj8 III N-Yu 0.6 0.7

1 2.5-10- -0.8

 0.9 2-10 0.7

III

 0.6 2-10 0.6 2-10 0.7

Famous

No data

Claims (2)

1.Abe Journal Japan Applied Physics 1974, 13, 1295-1296. 2.lamase T. etal. Chem. Letters 1973, 6, 615-616 (prototype).