DE1447963A1 - Method for producing a printing plate from presensilized printing plate material - Google Patents

Description

KALLE AKTIENGESELLSCHAFT 1447963

., _ Our sign day sheet,

K 1608 FP-Dr.P.-us November 5, 1965

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KALLE AKTIENGESELLSCHAFT Wiesbaden-Biebrich

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Process for the production of a printing plate from presensitized printing plate material

The invention relates to a method for producing a printing plate from presensitized printing plate material, which on a base made of metal, in particular made of aluminum or zinc, a light-sensitive Layer carries in which as a photosensitive substance at least one ester or at least one amide a naphthoquinonediazide sulfonic acid or a naphthoquinonediazide carboxylic acid and, although not necessarily, but preferably, a resin soluble in alkaline solution is also contained.

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KALLE AKTIENGESELLSCHAFT 1447963

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Such photosensitive printing plate material is known and the methods used to make it are used of offset printing plates in such a way that one has its photosensitive layer under an original with actinic Light exposed and the exposed areas of the layer from the base by treatment with a developer solution removed. One usually uses one for development alkaline solution. Usually, after developing, you color in with printing ink in order to first of all identify any errors in to be able to recognize the pressure plate. When coloring, only the areas of the metal base that have remained coated take up the printing color.

The result is a plate that in most cases still needs to be corrected because the layer or remnants of the layer have remained from the edges of the original and sometimes also in some areas of the image background of the printing plate, which ink accept and so an unclean when printing Would give image background. The correction agents are mostly alkaline or acidic aqueous solutions, which sometimes also contain a certain proportion of organic solvents, dissolved or emulsified. Only when one has available a printing plate with clean image background _a Is this ready for printing.

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Sometimes you have the printing plate, which already has a clean image background, in front of it Use for printing still further treated, for example to reinforce their image areas by removing the plate treated with a reinforcement varnish, or around the background of the picture to make the printing plate more hydrophilic by treating it with an acid or by treating the printing plate with a To cover a protective layer, because you want to use it later for printing. In any case, you have Understandably, a printing plate, the image background of which was once clean of printing stains, from soiling of the background of the picture and never treated in a way that would lead to the formation of a film must lead on the image background, which accepts printing color.

The known and practically used procedure described above is used Offset printing plates that can be used to produce large print runs. Nevertheless, there is a desire for a significant further increase in the print run that can be produced in perfect quality. Also are the known ones Printing plates for printing with inks that act as solvents or binders of high constituents Solution contained Bkraft, not usable, so that also in

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In all respects an improvement was desirable, especially with regard to the printing of plastic surfaces, which usually requires the use of printing inks with a strong dissolving effect.

The object of the invention is to meet these desires and accordingly the object of the invention is a A method of making a printing plate from presensitized printing plate material which is based on a metallic support · carries a photosensitive layer in which as a photosensitive substance at least an ester or an amide of an o-naphthoquinonediazide sulfonic acid or an o-naphthoquinonediazide carb'onic acid is, in which the light-sensitive layer is exposed under an original in a known manner, the exposed areas of the layer removed from the support with a developer and thereby or by a Correction treatment creates a clean printing ink-repellent image background, within which the coated remaining printing ink are located on the substrate, but in which one is inserted Objective achieved by the fact that the image areas of the layer of the printing plate material after the creation of the clean Image background in the presence of a novolak or a Resols or both types of resin to a temperature of

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heated to at least 180 ° C and then a second time clean printing ink creates repellent image background. The invention as a resin in the photosensitive Layer usable resols are in organic solvents and in aqueous alkaline solution soluble, fusible, condensation products of formaldehyde with a phenol which can be hardened by mere heating. the Novolaks which can also be used according to the invention are also condensation products of formaldehyde and a Phenol, however, differ from resols in that the condensation has been carried out in this way is that condensation products arise which are not curable by the application of heat and therefore also permanently thermoplastic and soluble when heated. Mixtures of novolaks and resols can of course also be used be applied. Novolaks, and among these in particular those produced by the condensation of o-cresol with formaldehyde Novolaks are particularly recommended for the process, because when they are used, the effects of heating the printing plate material occurring soiling of the picture background, which will be discussed further below relatively weak cleaning agents can be removed. Novolaks are preferred for the process used with melting points between 70 and 130 ° C,

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The novolaks and resols to be used according to the invention are well-known types of phenolic resins. Novolaks are formed by the condensation of a phenol with formaldehyde in an acidic condensation medium using less than one equivalent of aldehyde for every equivalent of phenol. Resoles are formed by the condensation of a phenol with formaldehyde in an alkaline reaction medium, whereby more than one equivalent of aldehyde is usually used for each equivalent of phenol, but a resin of the resol type is also obtained when using less aldehyde, provided that the condensation is only carried out in an alkaline condensation medium . Phenols that can be used both for novolak production and for resol production are, in addition to phenol in the narrower sense, also its homologues, in particular the cresols, xylenols and other alkylphenols. Formaldehyde is mostly used in the manufacture of the resins in the form of its trimer, namely paraformaldehyde. Instead of formaldehyde, another aldehyde is sometimes used in the manufacture of resols and novolaks, e.g. acetaldehyde or furfural. The production of novolaks and resols and the properties of these resins are known and have been described several times, for example in the book by Wagner-Sarx "Lackkunstharze", 4th edition (Munich 1959), pages 42 to 51, or in the 10th volume of the compilation Encyclopedia of Chemical Technology by RE Kirk and DF Othmer {1953, New York),

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Pages 335 to 339, as well as in the journal Industrial Engineering Chemistry, Volume 33 (19 ² U), page 966 ff.

Novolaks and resols are manufactured on an industrial scale and form commercial items. Also in the examples below have been used as novolaks or resols hand products, namely as novolaks "Alnovol 429 K" (Examples 1; 7 to 14; 19; 20 and 25 to 27), "Liacin 0" (Example 2), "Bakelite resin 205 "(Examples 3; 15 and 21)," Crayvallac 280 "(Examples 4; 16 and 22) and" Durez resin 175 "(Examples 5;

17 and 23) and as the resol "Bakelite resin 202" (Examples 6;

18 and 24).

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The presence of one of the named resins required according to the invention when the image areas of the layer are heated is preferably brought about by incorporating the resin into the photosensitive layer during the production of the presensitized printing plate material. In this procedure, the amount of resin contained in the photosensitive layer should be between 25% by weight? and 2000 wt. JS based on the amount by weight of the photosensitive diazo compound. Very good results and ease of handling of the printing plate material arise, however, when the resin amount of at least 100 wt -.% And not more than 600 wt .- ^, based on the .Gewichtsmenge to diazo compound is'.

The image areas of the layer can, however, also in the manner with the resin, which according to the invention in the Heating should be brought together by making a solution of the resin in an organic solvent applies to the coated surface of the printing plate material and dries. This can be done at any time take place before ^ heating; but the application of the resin solution is best done after the development of the exposed layer. It is sufficient to paint over the surface to be treated once, but you can also use it several times treat the paint. Applying a resin solution can

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can also be made when using such printing plate material, which is in the photosensitive layer already contains a resin to be used according to the invention, for example by the amount of that present during the heating To increase resin.

In the optionally used resin solutions, the resins should be in such organic form Solvent must be present which does not destroy the photosensitive layer. As such organic Solvents come into consideration, for example, those which are fully miscible with water, in particular those mixtures of solvents which are fully miscible with water, the 40 to 80 wt .-?, based on the total amount of solvent, a polyhydric alcohol contain. For example, ethylene glycol or glycerine can be used as polyhydric alcohols.

The amount of resin in the solution should preferably be between 3 and 20% by weight, based on the total solution, be. Solutions containing novolak which can be used for the purposes of the invention are, for example, those in US Pat German Patent 1 180 869 described paints.

Solutions of the resins which can be used according to the invention, their solvents, can also sometimes be used is only partially soluble in water. Such resin solutions are preferably used in a form emulsified in water,

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wherein the aqueous phase of the emulsion contains a water-soluble organic colloidal thickener. Such Emulsified resin solutions are described in German Patent 1,143,710, for example.

The printing plates according to the invention contain at least one ester as the photosensitive substance or at least one amide of an o-naphthoquinonediazide sulfonic acid or an o-naphthoquinonediazide carboxylic acid. Such Connections are for example in the German patents 854 890, 865 IO8, 865 109, 879 205, 938 233, 1 109 521, 1 114 70S, 1 118 606, 1 120 273 and 1 124 described. In the coating solutions used, the concentrations of diazo compounds should be 0.1 to 8 wt .- ^, but preferably 1 to 4 wt .- ?, be.

All metallic plates known in printing technology, such as aluminum., Zinc or steel plates or multi-metal plates such as chrome-copper plates, Chrome-copper-aluminum plates or chrome-copper-zinc plates. The panels can be smooth or have chemically, mechanically or electrolytically roughened or pretreated surfaces.

An essential part of the process is the heating of the exposed, and developed, with the resin provided image areas of the layer of the printing plate material.

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How high the heating temperature can be above 180 ° C, depends, among other things, on the resin used and on the temperature resistance of the substrate. One heats up in the case of aluminum substrates, preferably to 200 °

ο
250 C. The heating time is generally between 5 and 60 minutes, depending on the temperature used. The use of heating times that are moderately longer than required per se, for example twice as long as heating times, generally does not cause any serious disadvantages apart from the waste of time. Much higher heating temperatures could be used for printing plate material with a stainless steel substrate. At temperatures around M50 C a heating time of 30 seconds proved to be sufficient. The required heating temperature and the required heating time are understandably dependent on one another in such a way that a shorter heating time is sufficient at a higher heating temperature and vice versa. The heating to be carried out according to the invention is in any case to be carried out at such a high temperature for so long that the image areas have undergone such a change that the image background is at least partially covered with a coating that accepts printing ink when the printing plate is inking and one completely when printing or mostly dirty image background. One leads

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heating does not in this manner by extensive, so that one must again create a clean ink repellent background image at least before the printing, so ¹ to no remarkable improvement is obtained of the printing plate. T _he on heating the printing plate material on the screen surface is disheartening and when coloring with ink to inking pad is not usually recognizable with the naked eye. Therefore, when in the following the soiling of the picture background and its cleaning is meant, almost without exception, what is meant is soiling that is only visible to the naked eye and cleaning that is only perceptible to the naked eye when the printing plate has been coated with a printing ink or correction color has been colored.

During the heating process, the color of the copy chixsht, i.e. the developed one, changes in most cases printing image. The color change depends, among other things, on the diazo compound contained in the copy layer away. However, the color of the copy layer can, for example, be significantly influenced by a dye, which is included in the layer. In the case of copy layers that appear yellow due to the diazo compound, the

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Color change when heated, for example from pink to done to deep brown. Furthermore, the layer is usually no longer photosensitive after heating.

However, it is extremely important that the layer is resistant to acids, is even against concentrated acids and against practically all organic solvents. Even against diluted ones (0.5 Jig) alkali hydroxide solution, it is relatively stable. At the same time, the layer, i.e. the 'printing image, solidified in such a way that the number of prints that can be printed therewith is reduced by one even under unfavorable printing conditions Is several times higher than the print run that could be achieved with conventional methods.

A very important step in the process is to clean the background of the image again. Aqueous, weakly alkaline solutions are usually used as cleaning agents. But one is by no means limited to this. One can also use strongly alkaline solutions in some cases and acids in many cases use of all kinds. In practice, of course, one tries to get by with solutions that seem as weak as possible. As a rule, therefore, when cleaning a printing plate material, its most appropriate treatment had not yet been tried, proceed in such a way that the cleaning initially with aqueous weak

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alkaline solutions were tried, then with aqueous weakly and strongly acidic solutions, then with aqueous strongly alkaline solutions. Contain cleaning agents sometimes also organic solvents that are dissolved or in the aqueous solution of the alkaline or acidic substance can be emulsified and their main task is to use the printing or correction color used for coloring to remove. It is understandable that the contamination on the metallic substrates in the individual cases with different strengths, so that they adhere to a particular cleaning agent in different ways to be attacked. In every single case, however, it was found that the contamination was caused by the metallic substrate by wiping over the entire surface of the printing plate with at least one of the aforementioned cleaning agents is completely removable, while at the same time wiped over The print image was retained.

In many cases, it has proven advantageous to treat the printing plate material with an acidic one aqueous solution, e.g. with 1,8- ^ iger phosphoric acid, between the first creation of a clean printing ink repellent image background and heating. Such Treatment makes the metallic picture background more hydrophilic and thereby reduces its adhesive strength

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compared to the deposit deposited on it when heated.

The method according to the invention and that thereafter obtained printing plate can be used wherever previously known sensitized printing forms only moderate success was achieved, for example in web offset printing, with certain etching processes for letterpress and Gravure printing and when printing on plastic foils with printing inks that contain solvents with strong dissolving power.

It was extremely surprising that by heating printing plate material which of all things Resole resin or novolak contains, comes to printing plates with such high-quality performance properties. By heating that is to say, one initially obtains plates which are so spoiled that they cannot be used as a printing plate, since the one obtained The print image is covered with veils, stripes or spots, if not completely covered. It's nice It is surprising that a usable printing plate can still be made from it. But that you can use a HeatingB, which appears to result in ultimate spoilage of the printing plate material, becomes unusual high-quality printing plate is extremely surprising.

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Examples

In the examples below, one Volura part corresponds (Parts by volume) 1 ml, if as part by weight (parts by weight) of Ig. is used. B6i most of the examples below failed between development and heating Correction of the printing plate made because after developing the image background was so pure that it was not any Correction needed.

The mounting heights given in the examples can be Naturally, they are not evaluated as absolute, but only as relative information, since the achievable edition also depends on circumstances other than the quality of the printing plate material. In order to have time to carry out the attempt and saving material was used in most of the examples intentionally used such a printing machine which consumed the printing plate material relatively heavily.

1. With a solution

1.5 parts by weight of the condensation product a. 2,3,4-trihydroxy-benzophenone and

Naphthoquinone1,2) -diazide (2} -5-sulfochloride (production is described in German Patent No. 938 233 _t page 2, cells 75 to 91)

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0.8 part by weight of the condensation product from 1 mole of 2,2 ^f -dihydroxy-1,1 * -dlnaphthylmethane and 2 moles of naphthoehinonediazide- (2) -5-sulfochloride (preparation is described in German patent 865 109 in example 6)

6 parts by weight a novolak produced by the condensation of o-cresol and formaldehyde from Melting point 108-118 ° C

120 vol. Ϊ́, ethylene glycol monomethyl ether

was a mechanically roughened aluminum foil, underneath Use of a rotating base to throw off the excess amount of the applied solution, coated . The film was then dried in a stream of warm air and then dried at 100 ° C. for about two minutes.

The eo created presensitized Printing plate material can be stored for several months. However, as soon as it was made, it became under one Slide with a carbon arc lamp with a current of 18 amps exposed for one minute at a lamp distance of 70 cm. The exposed layer was wiped over Hit a cotton ball that has been dipped in 5-jSige trisodium phosphate solution

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K 1608 PP-Dr.P.-us 5.11 * 1965 - had been abandoned, developed, then rinsed with water and wiped over with 2 pounds of phosphoric acid. During development, the image appeared in a bright yellow color on a metallic background

Me dried printing plate was then put into a baking oven heated to 230 ° C and left in it for about 20 minutes. The color of the changed The image on the printing plate changes from greenish-yellow to pink to yellow-brown. By heating the pressure plate The layer solidified in the oven, but at the same time the background of the picture was soiled with a film. After the plate had cooled down, the side of the layer was wiped several times with 5% trisodium phosphate solution, whereby the surface of the picture was cleaned of the deposit while the picture remained standing. The slide was then submerged in 2% phosphoric acid and using a Cotton swab colored with bold printing ink. It came into being such a ready-to-use printing form.

The plate was printed on an offset press was used to make prints and at least 100,000 prints were made before it wears could be determined on the plate.

A second printing plate was produced in the manner described above, but with the difference:

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because the heating and the subsequent cleaning of the plateaus after developing were omitted. With the printing foil produced in this way, prints were made on the same offset machine ₉ and here, after the production of 30,000 prints, the printing form showed signs of wear and tear.

2. A roughened path on electrolyte! Aluminum foil was coated with a solution soft as follows:

1 _# 5 Qew, -T. of the condensation product from J Mol

Phloroglucinol and 1 mole of naphthoquinones 1,2) · dia «id- (2) -5-sulfochloride (preparation is described in example 1 of the German patent specification 1 109 521)

6 parts by weight of a novolak resin with an between

ο 100 and 120 C located scfamels area

120 vol. Ethylene glycol monomethyl ether The layer on! Was placed in a stream of warm air

* o included photosensitive printing plate material could be stored for months, but in the case of Beiapiel it was immediately after production under one

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Exposed slide. Then was with a 5-Jfigen aqueous Trisodium phosphate solution developed, rinsed with water and dried at 100 ° C. The printing form obtained showed the image on a clean, shiny, metallic background.

The film was then placed in a drying cabinet heated to 230 ° C. and left there for 20 minutes. After that, the background of the picture was completely soiled with a film. After cooling, the plate with 5 iiger wiped off with aqueous hydrofluoric acid, whereby the dirt on the image background was removed, while the printed image remained. After rinsing with water, the plate was ready for printing.

The printing film produced in this way was used in

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a printing press produced 50,000 perfect prints. With a printing plate prepared in a similar manner but not subjected to the heating treatment, could on the other hand, only 25,000 prints of perfect quality can be produced with the same printing machine.

3. The roughened surface of an aluminum foil was made with a solution.

2.0 parts by weight of the condensation product from 1 mol

2,3,4-trihydroxy-benztropolone and 1 mol

Naphthoquinori- (1,2) -diazid- (2) -4-sull! O -.-;.: . w Acid chloride (preparation is in Example 3 "·· ■■ - ν: ..;: of the German patent specification 1 124 817

described)

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5.0 parts by weight a novolak resin having a melting range from 95 - 100 ° C

120 vol. Ethylene glycol monomethyl ether

coated. In a manner corresponding to that described in Example 1, a printing form was produced, wherein for developing a 1.5 J solution of trisodium phosphate used and the developed, hydrophilized and dried printing plate in a drying cabinet for 20 minutes

ο
240 C and then cleaned with 3-strength aqueous hydrofluoric acid.

With the film produced in this way, 60,000 perfect prints could be obtained in a printing machine will. When using one that has not been heated after development but is otherwise produced in a corresponding manner Only 15,000 perfect prints could be obtained for the printing film.

4. A solution was applied to the mechanically roughened surface of an aluminum foil, which

2.0 parts by weight of the condensation product

1,2,3-trihydroxy-anthraquinone and Naphthoehinon- (1,2) -diazid- (1) -6-

sulfonic acid chloride (manufactured in French patent 1 267 37 ¹ J

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with reference to the contained therein Formula 13 described)

5.0 parts by weight a novolak made from cresol and formaldehyde with a melting range of 90 - 105 ° C

110 vol. Ethylene glycol monomethyl ether

contains. In a manner similar to that described in Example 1, a printing plate was prepared, using a 2-jig sheet for development Trisodium phosphate solution used which developed, hydrophilized and dried film heated to 240 C for 20 minutes and then with 5 ^ iger trisodium phosphate solution was cleaned "

With the printing plate produced in this way, 60,000 perfect prints were produced, while with one in a corresponding manner, but not subjected to the heating process, only 6,000 perfect prints could be produced.

5. By coating the electrolytically roughened Surface of an aluminum foil with a solution

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2.0 parts by weight of the condensation product from 1 mol 2,2 ·, 4,4 * -Tetrahydroxy-diphenyl and 3 moles of naphthoquinone- (1,2) -diazide- (2) -4-sulfonic acid chloride (Production is described in German patent specification 1 120 273)

5.0 parts by weight a novolak resin, the melting point of which

is in the range of 60 - 70 ° C, and 100 parts by volume. Ethylene glycol monomethyl ether

was in the manner described in Example 1 a Pruck plate manufactured. A 5-pack trisodium phosphate solution was used for developing developed, hydrophillized and dried film

Heated to 230 ° C. for 20 minutes and, after cooling, treated with 5% trisodium phosphate solution to remove the dirt from the background of the picture.

With the printing form produced in this way, 60,000 perfect prints could be produced while with a printing form that is not subjected to heating but otherwise produced in the appropriate catfish only, 25,000 prints could be obtained on the same printing machine.

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6. Following the method described in Example 1 was a printing form is made, the mechanically roughened surface of an aluminum foil with a solution

2.0 parts by weight of the condensation product from 1 mol

2,3,4-trihydroxy-benzophenone and 1 mole of naphthoquinones 1,2) -diazide- (2) -5-sulfochloride (Production is described in German patent 938 233)

5.0 parts by weight a resole resin with a melting range from 90-95 ° C and

100 FoI.-T. Ethylene glycol monomethyl ether

coated, the exposed layer was developed with 5% trisodium phosphate solution, the developed film was heated to 230 ° C. for 20 minutes and the soiling of the image background was removed with 5% trisodium phosphate solution.

With the printing plate produced in this way, perfect prints were obtained in a printing machine HO 000, while with a printing plate produced in a corresponding manner but not subjected to heating, only 20,000 perfect prints could be obtained.

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7 · In the manner described in Example 1, a printing plate was produced by mechanically roughening the Surface of an aluminum foil with a solution

2.0 parts by weight of the condensation product from 1 mol

2,3, ¹ l-trihydroxy-benzophenone and 1 mol.

Naphthoquinone- (1,2) -diazide- (2) -5-sulfo-

chloride

5.0 parts by weight of an o-cresol-formaldehyde novolak resin with a melting range between 108 and 118 ° C and 1 * 10 parts by volume. Ethylene glycol monomethyl ether

coated, the applied layer dried, exposed under a template, with 5 # trisodium phosphate solution developed, made hydrophilic with aqueous phosphoric acid and dried.

The printing plate produced in this way was cut into two halves. One half was made with a varnish coated with the following components:

50 parts by weight Cyclohexanone

50 parts by weight Glycerin

5 parts by weight of the above-mentioned novolak resin 0.5 parts by weight. Crystal violet (Schultz, color tables No. 785, page 330)

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The novolak resin of the lacquer bonded firmly to the on the image layer located on the surface of the aluminum substrate, while it is on the metallic stitched image parts did not stick.

The coated half of the printing plate was then washed with water, dried and put on for 20 minutes

ο
Heated at 230 ° C., the background of the picture got a deposit which was removed with 5% trisodium phosphate solution.

The other half of the printing plate remained unpainted and was not heated.

The two halves of the printing film were used for printing, and it was found that the lacquered Half of 40,000 perfect prints could be obtained, while the unpainted half, which was not heated after development, only delivered 3D 000 perfect prints.

8. Find a solution

2.0 parts by weight of the condensation product from 1 mol

2,3,4-trihydroxy-benzophenone and 1 mol

Naphthoquinones 1,2) -diazide- (2) -5-sulfochloride and
120 vol. Ethylene glycol monomethyl ether

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was applied to the mechanically roughened surface of a Aluminum foil applied and dried. In the manner described in Example 1, a printing plate was made produced using a 2-strength trisodium phosphate solution for developing. The plate was in two Cut halves. One half was coated with the novolak resin solution given in Example 7 above. The resin bonded firmly to the surface of the printing film at the image areas, but it did not adhere on .the picture background. After washing the painted plate half with water, it was dried and then Heated to 240 ° C. for 20 minutes. The resulting soiling of the picture background was treated with trisodium phosphate solution removed. The unpainted half was subjected to the same heating. With the painted 40,000 perfect prints could be obtained with half of the plate, while the non-varnished half only 5,000.

9. A photosensitive offset printing plate material prepared as described in Example 1 was used under an original exposed, developed and with 1-Jiiger Wiped off phosphoric acid. To make the areas to be corrected more visible, a black Color colored. The printing plate was dried, then

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send corrected with a correction medium available for pre-coated offset printing plates and again treated with dilute phosphoric acid.

After the printing plate was evenly gummed to protect the non-image parts and then dried, the ink was carefully washed off with a commercially available washout tincture containing gasoline. The gum was then removed by washing with water. The plate was then treated with 1- ^ phosphoric acid 'and dried. Then she was in an oven

ο
heated to 2 ^ 0 C for about 20 minutes. After cooling, the printing plate was treated further as indicated in Example 1. The plate produced in this way produced considerably more prints than a plate produced in the same way but not heated after the gum had been washed off.

10.-12. Example 8 was repeated three times, except that β-naphthol ester was used as the photosensitive substance l, 2-naphthoquinonediazide- (l) -carboxylic acid- (3), or the N-methylanilide of 2, l-naphthoquinonediazide- (2) -sulfonic acid- (5), or the n-dodecylamide of 2, l-naphthoquinonediazide (2) sulfonic acid (5) used. The printing plates obtained behaved similarly to that described in Example 8 Printing plate according to the invention.

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KALLE AKTIENGESELLSCHAFT Ϊ447963 Our sign day sheet

K 16O8 FP-Dr.P.-us November 5, 1965 -

13 · For the production of printing plates for the multi-color printing process Example 1 was followed. Thereby under exposure of color separation originals Printing plates made for red, yellow, blue, black and white. The plates were heated at 260.degree for 15 minutes. A cellulose triacetate film was produced with the printing plates in a multicolor printing machine and 60,000 perfect color prints could be obtained.

With correspondingly produced printing foils, but during their production the heating of the printing plates did not occur, on the other hand only 12,000 perfect prints could be produced.

I ¹ I. An aluminum foil provided with a copper layer was coated on the copper surface with a solution, the composition of which is described in Example 1 above. After drying the layer, a presensitized bimetal plate was obtained.

It was exposed under a slide and developed with 5-jig trisodium phosphate solution. That The image appeared in a pale yellow tint on a red copper background. The plate was made with 2.5% phosphoric acid wiped over, dried, heated in an oven to 240 C for 20 minutes, after cooling with 5% sodium

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KALLE AKTIENGESELLSCHAFT 1447963 Our sign day sheet

K 1608 PP-Dr.P.-us 5.II.I965 -

phosphate solution cleaned, rinsed with water and then dried. The film was then placed in a ferric chloride solution of 35- ^ 1 ° Be and is as long as allowed to ₉ to the non-image areas, the copper layer was completely removed and the bare aluminum emerged. The image side of the plate was then rinsed with water, wiped over with 2% phosphoric acid and dried. The printing plate was then heated and cleaned as indicated in Example 1. With the bimetal printing plate obtained in this way, a higher print run was obtained than with a printing plate which had been produced in the same way, but omitting the heating.

I5-2O. There was one printing plate according to the examples 3-8, but in the process zuip was removing the the heating of the deposit deposited on the background of the picture instead of aqueous trisodium phosphate solution 3% aqueous hydrofluoric acid is used. the The results obtained were similar to the results of Examples 3 to 8.

21.-26. There was one printing plate according to the examples 3-8, but it was used to remove what was deposited on the background of the painting by the heating Topping instead of aqueous trisodium phosphate solution 5-56 aqueous borofluoric acid used

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KALLE AKTIENGESELLSCHAFT 1447963 Our sign day sheet

K 1608 FP-Dr.P.-us November 5, 1965 -3 # -

The results obtained were similar to the results of Examples 3 to 8.

27 A surface of several stainless steel plates was rubbed with pumice stone powder and water, then rinsed with water, rinsed with distilled water and dried with a stream of warm air. The surfaces cleaned in this way were coated with the coating solution described in Example 1 with a photosensitive Apply a layer of about 2 g per m. The printing plate material thus obtained was, as indicated in Example 1, exposed and developed.

One of the plates became

Heated to 260 ° C for 10 minutes, another heated to 3 ^ 5 C for 5 minutes and yet another Heated to 3 ^ 5 C for 2 minutes.

The deposit deposited on the background of the picture was in all three cases with 5-Stiger trisodium phosphate solution wiped off without the image being attacked by the cleaning agent used.

The resilience of what is on the plate The image was then tested against solution attack with a paint remover which was composed as follows:

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KALLE AKTIENGESELLSCHAFT 1447953

Our time of day sheet

K 1608 FP-Dr.P.-us November 5, 1965 -

30 parts by weight Ethylene glycol monomethyl ether

3.15 parts by weight Potassium hydroxide

3.8 parts by weight Polyvinyl pyrrolidone
, 5.1 parts by weight Xylene

0.03 part by weight Thymol blue

and is to be regarded as a very aggressive paint remover.
The stripping agent was sprinkled on the image areas during the test and two drops of solvent were used
Let stand on the drizzled spot for minutes. The plate surface was then wiped with a cotton ball dampened with water and rubbed. In each of the three cases it was found that the painting on the plate was not damaged by the paint stripping agent
had been. From this fact it can be concluded with certainty
conclude that the printing plates are suitable for printing with inks which have very high components
Solvent power included.

Another of the developed panels was placed in an oven heated to 460 ° C for 30 seconds. This plate was also found to be suitable for printing using the test method described above
inks containing aggressive solvents.

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KALLE AKTIENGESELLSCHAFT ..._

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Our sign day sheet

K 1608 FP-Dr.P.-us November 5, 1965

Those fixed on the plates by heating
Pictures proved to be resistant to dimethylformamide, among other things, which is considered to be one of the most powerful organic solvents.

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Claims (5)

KALLE AKTIENGESELLSCHAFT Our sign day sheet K 1608 FP ~ Dr _a P _e -us 5 * 11 * 1965 Patent claims Method ₉ carrying a photosensitive layer for preparing an offset printing plate vorsenslbillslertem of printing plate material on a metallic substrate, in! Which as a photosensitive substance at least one ester or amide of a Q-Naphthochinondiazidsulfosäure or o-naphtho = chinondiazidcarbonsäure included is ₂ wherein one the exposed photosensitive layer under an original with actinic light, the exposed areas of the layer removed from the support with a developer and thereby or by a correction treatment creates a clean printing ink-repellent image background, within which the coated printing ink-accepting areas of the metal base are, thereby characterized in that the image areas of the layer of the printing plate material are heated to a temperature of at least 180 C after the creation of the clean image background in the presence of a novolak and / or resol and sod can create a clean, ink-repellent image background a second time. 80 980 8 / Whether 02 KALLE AKTIENGESELLSCHAFT Our sign day sheet K 1608 PP-Dr.P.-us November 5, 1965 - 2. The method according to claim 1, characterized in that causing the novolak or resole to be present in the heating by using a printing plate material used, in whose photosensitive layer novolak and / or resol resin is contained. 3 «Method according to claim 2, characterized in that a printing plate material is used, ' a novolak is contained in the photosensitive layer. l |. Method according to claim 1, characterized in that that the presence of the novolak or resole in the heating is caused by coating on the An optionally emulsified solution of the surface of the printing plate material at the latest before heating Resin applies and dries. 5. The method according to claim 4, characterized in that that a novolak solution is applied and dried. 809808/0502 KALLE AKTIENGESELLSCHAFT K 1608 Our sign day sheet FP-Dr.P.-us 5.II.I965 - 6. Process for printing on plastic surfaces using printing inks which, due to their dissolving power, adhere to the plastic surfaces, characterized in that one according to Claims 1 to 5 is used for printing in the offset process manufactured printing plate used. KALLE AKTIENGESELLSCHAFT 8 0 9 8 0 8/0502