SU741227A1 - Water-soluble photopolymerisable composition - Google Patents

Description

Sodium polyacrylate

(15g% alcohol

solution 65 -95

Acrylic acid 1 -12 6-Caprolactam 0.1-5

Ethylene glycol dimethacrylate0.5 -10

Benzophenone or his

derivative, 0.05-. 0.5

Inhibitor 0.5 - 1

Phenazine or his

derivative0.05-0.8

The proposed composition has a higher overall sensitivity than the prototype, its spectral sensitivity is shifted to the long wavelength region of the spectrum (440-570 nm).

At the same time, a change in the exposure time within considerable limits from the optimal one does not lead to a deterioration in the image quality.

.Paper 1. K 85, O weight, h. alcohol solution (concentration of 15 wt.%) sodium polyacrylate with thorough stirring, add 0.1 weight.h. benzophenone and 0.14 weight.h, phenazine, previously dissolved in 4 weight.h. ethyl alcohol. Then 0.02 parts by weight was added thereto. hydroquinone and 0.5 weight.h. 6-caprolactam, also pre-dissolved in 7 parts by weight ethyl alcohol. After thorough mixing, 1.4 parts by weight are added. ethylene glycol dimethacrylate and 1.71 parts by weight acrylic acid. The composition is homogenized and deaerated, and then applied with a Plexiglas binder on a pre-degreased, nylon mesh stretched onto a frame. After drying the layer in a thermostat at 30–40 ° C until complete drying, another layer is applied.

Exposure of the obtained film was carried out through the photomask with the PRK-7 lamps at a distance of 40 cm without a filter and with an ZhS-4 filter, respectively, for 3 and 5 minutes. The image on the film is developed by washing out non-irradiated areas with a stream of water. After drying, a screen printed form is obtained with a good transfer of all elements of the model photoform.

Example 2. 12,75 weight.h; Sodium polyacrylate (mol. mass 15000-30000) is dissolved in 72.25 weight. ethanol and to the resulting solution (sodium polyacrylate concentration 15 wt.%) 0.05 wt.h. 4-chlorobenzophenone, 0.1 weight.h. 1-methoxy-6-ethoxy-phenazine 0.02 wt.h, hydroquinone and 0.45 wt.h. € -caprolactam, pre-dissolved in 12 parts by weight ethyl alcohol. Then, with thorough stirring, pour 1.7 parts by weight. acrylic acid and 1.4 weight.h. ethylene glycol dimethacrylate homogenization and a deaerator, the composition is applied in one thin layer onto a pre-degreased surface of silicate glass. Drying of the film takes place at 30-40 ° C

A photo mask is placed on the surface of the film. They are exposed with the light of the PRK-7 lamp at a distance of 40 cm. Without a filter and with an ZhS-4 filter, respectively, for 0.5 and 2 minutes. The image on the film is developed by a stream of water. After drying, an image with a good transfer of all elements of the model photoform is obtained.

Example 3. To 85 weight.h. alcoholic solution (concentration of 15% by weight sodium polyacrylate, with thorough stirring, 0.1 parts by weight of benzophenone and 0.14 parts by weight of 1-methoxyphenazine, previously dissolved in 4% by weight, of ethyl alcohol are added. Then added 0.02 parts by weight of hydroquinone and 0.5 parts by weight of fc-caprolactam, also previously dissolved in 7 parts by weight of ethyl alcohol, after thorough mixing, 1.4 parts by weight of ethylene glycol dimethacrylate, 1.7% acrylic acid. The composition is homogenized and deaerated, and then applied with a Plexiglas film preliminarily degreased nylon mesh stretched on the frame.

The exposure of the film is carried out through the photo mask using the PRK-7 lamp at a distance of 40 cm without a filter and with a JS-4 filter, respectively, for 0.5 and 1 min. The image on the film is developed by washing out non-irradiated areas with a stream of water. After drying, a screen printed form is obtained with a good transfer of all elements of the model photoform.

Example 4. K 85, About weight.h. alcohol solution (sodium polyacrylate concentration 15 wt.%) with careful stirring, 0.1 weight.h 4 4-dichlorobenzophenone and 0.1 weight.h. 1-methoxyphenazine, pre-dissolved in 4 parts by weight ethyl alcohol. Then 0.02 parts by weight is added. hydroquinone and 0.5 weight.h. -caprolactam, also pre-dissolved in 7 parts by weight ethyl alcohol. After thorough mixing, 1.4 parts by weight are added. ethylene glycol dimethacrylate and 1.7 weight, h. acrylic acid. The composition is homogenized and deaerated, and then applied with a metal filler with a gap of 0.1 cm on the copper substrate free of oxide layer and after drying, the film is exposed to the light of the PRK-7 lamp at a distance of 40 cm without a filter and with an ZhS-4 filter, respectively. 2 and 4 min.

After development and drying on the surface of the copper plate, a clear image is obtained. Etched Rust

ferric chloride gets a pattern of metal conductors (printed circuit boards).

The exposure time of a known composition is 10-30 minutes, which is Ω to wavelengths not longer than 400 nm.

Thus, from the above examples, it follows that the proposed composition has a higher overall photosensitivity, its spectral sensitivity is shifted to the long-wavelength spectral range (440-570 nm), while the composition has a large width of working exposures.

Claims (2)

Invention Formula A water-soluble photopolymerizable composition for the manufacture of printing forms and relief images, including sodium polyacrylate, acrylic acid, -caprolactam, ethylene glycol dimethacrylate, a thermal polymerization inhibitor, a photo initiator — benzophenone or its derivative, characterized by the fact that, in order to increase the overall sensitivity with simultaneous expansion of the spectral sensitivity in the long wavelength region of the spectrum, as well as increasing the width of the working exposure, it additionally contains phenazine or its derivative, with the following ratio of components, parts: Sodium polyacrylate (15% alcohol 0 solution) 65 -95 Acrylic acid 1-12  -Caprolactam 0.1-5 Ethylene glycol methacrylate 0.5 -10 five Benzophenone or his derivative0.05-0.5 Inhibitor 0.5-1 Phenazine or his derivative0.05-0.8 0 (Sources of information taken into account in the examination 1, USSR Author's Certificate No. 536459, c. 03 C 1/68, .1976 2. Forward 2372159 / 23-04 from 5 14.06.76, according to which a decision was made to issue an author's certificate.