CS204792B1 - Method of preparation of the light sensitive negativly working polymere layer - Google Patents

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(61) (23) Show Priority (22) Enrolled 19 09 79 (21) PV 6310-79 204 792 (11) (Bl) (51) Int. Cl.3 G 03 F 7/08

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AND DISCOVERY (40) Published 31 07 ®0 (45) Published 01 07 83 (75) CÍK GABRIEL ing.CSc., LUŽÁKOVÁ VLASTA ing.CSc.,

Author of the invention BLAŽEJ ANTON prof.ing.DrSc., ŽOFFA MILAN ing.,

BRATISLAVA (54)

A method of preparing a light sensitive negative working polymer layer

It is an object of the invention to provide a method for preparing a light sensitive negative working polymer layer for photomechanical reproduction.

Image reproduction by photomechanical procedures is based on copying the desired template into a thin light sensitive film, usually applied to a metallic mat, by irradiating the photosensitive changes of the light sensitive substance, which in addition to changing the solubility at the ultraviolet rays. The latent image thus formed is then elicited by dissolving the photosensitive substance in the cities where the ultraviolet radiation has not occurred, or where the ultraviolet rays by the photochemical reaction are compatible with increasing the solubility of the conventional solvents. In this way it is possible to apply light-sensitive substances in the form of thin films in the electrotechnical industry in the production of printed circuit boards and in the processing of semiconductors for transistors and integrated circuits, in the printing industry in the preparation of printing forms and in engineering in the production of miniature parts by chemical machining and making scales, labels and decorative ornaments. Current light sensitive substances for photomechanical reproduction are predominantly synthesized by incorporating photoreactive groups (chromophores) into the polymeric support. Negative-working light-sensitive polymeric materials crosslink polymer chains due to ultraviolet radiation, making the polymer insoluble in solvents. In order to form free radicals, which may induce a cross-linking reaction, they use substances, in particular, in their structural formula, double bonds, such as unsaturated ketones, unsaturated esters, and azido- and diazo-containing compounds. 204792 2 204 792

The principle of the preparation of the light-sensitive polymer layer according to the invention is that the dye of the formula oir is reactively reacted with the hydrophilic polymer, preferably carboxymethyl- or hydroxyethylcellulose. 0 ™ = ~ So3 ». Cl / CH 2 Cl 2 Cl

N-C, N-C7

The photosensitizer, preferably the nitrated benzaldehyde, is added to the solution obtained in this way, and the prepared solution is applied in a thin layer to the desired substrate.

Creating a photomechanical image. Reproduction! According to the invention, a cross-linking reaction of dyed water-soluble polymers capable of chemically bonding the azo dye of the above formula with the Czechoslovak commercial designation STASIN Yellow S-GR is based. This dye contains in its structural formula an activated double bond with a nitro group. Double bond after interaction! with ultraviolet radiation subjected to cyclodimerization to form a water-insoluble polymer system. The light sensitive polymer system can be applied to any thin film support using photomechanical reproduction! in the electrical, printing and engineering industries. If desired, the light sensitive layer can be sensitized by triplet sensitizers. The advantage of our proposed method is that the basic light sensitive composition is prepared from an aqueous solution and a moderately warm water is sufficient for the developer, which greatly improves the hygienic and operational properties of the layer. The dark dye binding reaction to the polymer does not require increased energetic demands, because the dye includes so-called cold reactive dyes. Conventional equipment used in the printing industry and in the production of electrical products can be used to process the layer. The proposed light sensitive layer is distinguished by its high resolution, good adhesion to the substrate and resistance to dilute acids.

A practical embodiment of the processes for preparing the copolymer layer according to the invention is as follows:

S-GR in aqueous alkaline medium to hydrophilic polymer. After the alcohol has been precipitated with alcohol, the tactomodified polymer is dissolved in water to the desired concentration, and the resulting light-sensitive solution is applied to a metal support in a centrifuge, by pouring, spraying, or visor coating. The film obtained is allowed to dry. The image of the original is then copied into the light-sensitive layer by irradiation with ultraviolet light. The copied image is created with warm water and the copy is further modified according to the required processing technology. Example 1 5 g of hydroxyethyl cellulose are dissolved in 25 g of distilled water. Into the obtained polymer solution, 1 g of Ostanzl-S yellow reagent dye S-GR is gradually added while stirring continuously for 60 minutes. The reaction is carried out in an alcamine medium at H = 10.5 to P12. sodium chloride concentration. 60 g. 1 ~ A, 10 ml of sodium carbonate solution 0.3 g / l. 1 and 5 ml of sodium hydroxide solution 0.6 g / l. The reaction temperature ranges from 25 to 40 ° C. The polymer obtained is precipitated with ethyl alcohol and dissolved in 200 g of distilled water. The solution thus prepared is applied to the anodically oxidized aluminum surface in a horizontal centrifuge at 50 rpm. The coated plate is allowed to dry in an oven at 40 ° C for 5 minutes, bonded to a negative pattern, and the image is copied in the exposure

Claims (1)

3,204,792 devices (3000 W ultraviolet light source, exposure time 10 minutes). The copied image is triggered by a hot water stream. EXAMPLE 2 Procedure as in Example 1, with 1% by weight of photosensitizer (benzophenone, Hichler's cotone, 2-nitrobenzaldehyde) added to the base solution. By adding a sensitizer, the exposure time is reduced to 1 minute. Example 3 Procedure as in Example 1, with carboxymethylcellulose being used as hydrophilic polydride. The copper sheet is covered by ore. The exposure is made by a 125 W mercury explosion from 25 cm in 60 minutes. The plate is induced by a flow of heat. EXAMPLE 4 Procedure as in Example 1 except that polyacrylamide is used as the hydrophilic gas. The coating is performed on a horizontal centrifuge at 50 rpm on an oxidized aluminum sheet. The resulting film is allowed to dry at 40 ° C for 5 minutes. Coupling with the non-aggressive pattern is copying by a 125 W mercury lamp from 25 cm for 180 minutes. Obtaining a copy is caused by warm water. Example 5 Procedure as in Example 1, with polyvinyl alcohol being used as the hydrophilic polymer. Laying on the aluminum sheet is performed on a horizontal centrifuge at 50 rpm for one minute. The resulting film is allowed to dry at 40 ° C for 5 minutes. After being connected to negatlvomsa, it copies the 125W image of the mercury lamp for 120 minutes, from a distance of 25 cm, Recall with warm water. OBJECT OF THE INVENTION A process for preparing a light-sensitive negative working polymer layer, by making the hydrophilic polymer, preferably carboxymethyl- or hydroxyethyl-cellulose, a reactive dye of the formula o2w binds to the alkaline medium. A photosensitizer, preferably nitrated benzaldehyde, is added to the obtained solution and the thin-layer solution is applied in a thin layer. to the desired washer.