JPH1138603A - Photosensitive printing plate and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the falling of a matting agent having an average grain size larger than the dry film thickness of the uppermost layer of photosensitive layers while assuring a good vacuum contact characteristic by incorporating the matting agent described above into the uppermost layer. SOLUTION: This printing plate has the plural photosensitive layers 2, 3 on a base 1 and contains the matting agent having the average grain size larger than the dry film thickness of the uppermost layer 2 of these photosensitive layers in the uppermost layer 2. More preferably, the uppermost layer 2 and the other photosensitive layer 3 are applied by a wet-on-wet system. This wet- on-wet system means that the coating liquid for the photosensitive layer of the adjacent uppermost layer 2 while the photosensitive layer 3 applied on the base 1 is wet. For example, the system refers to the execution of the coating by using a die coater 4 provided with a liquid pool part 5 and to the case where the base 1 coated with the first photosensitive layer 3 is coated with the coating liquid for the remaining photosensitive layer before entering the stage of a drying zone. The coating liquid for the remaining photosensitive layer is usually applied within five seconds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive printing plate, and more particularly, to a photosensitive printing plate having a photosensitive layer having a matting agent, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in order to print a film original in close contact with a photosensitive printing plate, a vacuum printing frame is generally used, and the film original and the photosensitive printing plate are placed between a glass plate and a rubber sheet of the printing frame. A method in which a vacuum is applied between a glass plate and a rubber sheet to bring a film original image and a photosensitive printing plate into close contact (referred to as a vacuum contact method) is used. In this vacuum contact method, matting is performed on the surface of a photosensitive layer of a photosensitive printing plate in order to obtain a sufficient contact state over the entire surface to be contacted in a short time. As a method of matting, a photosensitive liquid in which fine particles are dispersed is coated on a support as described in JP-A-56-9739, followed by drying, whereby the surface of the photosensitive layer is matted. Although a method can be mentioned, in such a method in which fine particles are contained in the photosensitive layer and the surface thereof is matted, the particle diameter of the fine particles must be larger than the thickness of the photosensitive layer. However, in such a case, the photosensitive layer is defective due to the removal of the particulate matter, and the printing durability is degraded during printing. If a plurality of photosensitive layers are applied one by one and then dried and provided, each time the drying process is performed, the previously applied layer is heated, and as a result, the printing durability of the layer also deteriorates. There is a tendency. Further, there is also a problem that the particulate matter is insoluble in a developer and causes a decrease in developability.

On the other hand, in order to prevent the photosensitive layer from being damaged during transportation or the like, it is common practice to superimpose a thin sheet of paper called a slip sheet on the surface of the photosensitive layer for each photosensitive printing plate.
However, when a photosensitive printing plate is used, there is a problem that it takes time to remove the slip sheet, and a large amount of the slip sheet is generated as industrial waste.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a photosensitive layer having excellent printing durability and developability while maintaining excellent vacuum adhesion to an original film. It is an object of the present invention to provide a photosensitive printing plate capable of preventing deterioration and providing an improved photosensitive printing plate thereof, and capable of preventing a photosensitive layer surface from being damaged during transportation or the like without using a slip sheet. It is in.

[0005]

The above object of the present invention has been attained by the following constitutions.

(1) A method in which a plurality of photosensitive layers are provided on a support, and the uppermost layer contains a matting agent having an average particle size larger than the dry thickness of the uppermost layer of the photosensitive layer. Characteristic photosensitive printing plate.

(2) The photosensitive printing plate as described in (1) above, wherein the uppermost layer and another photosensitive layer are applied by a wet-on-wet method.

(3) A method for producing a photosensitive printing plate, comprising applying the uppermost layer and another photosensitive layer by a wet-on-wet method.

That is, the inventors of the present invention have determined that the above problem arises due to the use of particles having an average particle size larger than the dry film thickness of the photosensitive layer. If a matting agent having a larger average particle diameter than the dried film thickness of the uppermost layer is contained, the matting agent is prevented from falling off while ensuring good vacuum adhesion, thereby causing defects in the photosensitive layer, In addition, the present invention has been made based on the finding that the cause of the deterioration of printing durability during printing is also eliminated, and at the same time, the effect of preventing a decrease in developability and preventing damage to the photosensitive layer surface is possible. To play. Further, by applying the uppermost layer of the photosensitive layer and the other photosensitive layer by a wet-on-wet method, the drying step can be reduced, and the effect of contributing to an improvement in printing durability can be obtained.

Hereinafter, the present invention will be described in detail. The photosensitive printing plate and the method for producing the same will be described in this order.

[1] Photosensitive Printing Plate The photosensitive printing plate of the present invention has a plurality of photosensitive layers on a support, and has an average particle size larger than the dry thickness of the uppermost layer of the photosensitive layers. It is characterized in that a matting agent is contained in the uppermost layer, and in a preferred embodiment, the uppermost layer and another photosensitive layer are applied by a wet-on-wet method.

The photosensitive printing plate basically has a photosensitive layer provided on a support, and is used for producing a printing plate. The support includes a plate-like material having good dimensional stability used as a plate material of a printing plate.

For example, a support as a lithographic photosensitive printing plate includes a roughened aluminum support. Examples of the roughening method include a method of mechanically roughening the surface, a method of electrochemically roughening the surface, and a chemically roughening method of roughening the surface with an etching agent composed of an alkali, an acid, or a mixture thereof. It is possible to use a conversion method or a method combining these. The roughened aluminum support is subjected to anodic oxidation treatment and sealing treatment as required. The aluminum support can be provided with a hydrophilic layer. Further, a protective layer can be provided on the back surface of the support in order to prevent scratches on the photosensitive layer when the photosensitive printing plates are stacked and to prevent elution of the aluminum component into the developing solution during development. For details of the support, see UK Patent Publication No. 2,030,3.
09A can be referred to.

The photosensitive layer includes a positive photosensitive layer containing an o-quinonediazide compound as a photosensitive component, a negative photosensitive layer containing a photosensitive diazonium salt or a photosensitive azide compound as a photosensitive component, and an addition-polymerizable ethylenically unsaturated diamine. Negative type photopolymerizable compositions containing a compound having a heavy bond as a main component, and photocrosslinkable compounds containing a cinnamic acid or a dimethylmaleimide group as photosensitive components are included. The details of the photosensitive layer can be referred to the above-mentioned British patent and the like.

The "matting agent having an average particle diameter larger than the dry thickness of the uppermost layer of the photosensitive layer (hereinafter simply referred to as matting agent)" in the present invention includes, for example, polyethylene particles, polypropylene particles, ethylene-propylene copolymer. Examples include coalesced particles and crosslinked vinyl polymer particles. The crosslinked vinyl polymer particles are usually obtained by a well-known suspension polymerization method. As an example, a hydrophobic vinyl monomer having one vinyl group (for example, acrylates, methacrylates, styrene, styrene derivatives, acrylonitrile, etc.) and 1 to 5
30 parts by weight of a polyfunctional monomer (for example, divinylbenzene, polyethylene glycol diacrylate (ethylene number n = 1 to 14), polyethylene glycol dimethacrylate (ethylene number n = 1 to 14), trimethylolpropane triacrylate, trimethylol Propane trimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate) and a dispersant usually used for suspension polymerization (for example,
An inorganic medium such as zinc oxide or calcium carbonate talc, or a water-soluble polymer such as gelatin or polyvinyl alcohol) is dissolved in an aqueous medium, and the atmosphere is replaced with degassed nitrogen. The temperature is raised to about 50 to 80 ° C. while stirring. Usual oil-soluble polymerization initiator (for example, benzoyl peroxide, azobisisobutylnitrile, etc.)
And polymerized for about 2 to 20 hours. Thereafter, the solid-liquid separation and drying are performed to obtain crosslinked vinyl polymer particles. In addition, fine powders substantially insoluble in coating solvents such as talc powder, glass powder, starch powder, wheat flour, titanium oxide, alumina, zirconium oxide, silicon dioxide powder, and alcohol-insoluble nylon can also be used. These can be used in combination of two or more.

The average particle size (diameter) of the matting agent used in the present invention is suitably from 1 to 10 μm, preferably from 2 to 7 μm. If the particles are smaller than 1 μm, not only the vacuum adhesion time cannot be sufficiently reduced, but also a sufficient vacuum cannot be obtained. If the particles are larger than 10 μm, it becomes difficult to design or select the dry film thickness of the uppermost layer of the photosensitive layer, the appearance of the coated surface is impaired, the area where the particles are present becomes defective, and the particles themselves fall off. And the printing durability of the photosensitive layer is likely to be greatly affected.

In the present invention, the amount of the matting agent to be present on the uppermost layer surface of the photosensitive layer can be selected from a wide range, but is preferably in a range of about 50 / cm ² to about 500,000 / cm ² , more preferably. Is 1000 to 100000 pieces / cm ²
Is selected from the range. Usually, an optimal range is determined by performing a number of trial experiments. Also, the amount of the matting agent dispersed and contained in the coating solution to be in such a range varies depending on the coating amount of the photosensitive layer, but the solid component in the coating solution (the amount excluding the solvent of the coating solution) In the range of about 0.01% to about 20% by weight, preferably 0.1% to 10% by weight.

The photosensitive layer contains an alkali-insoluble resin, a dye,
It may contain plasticizers, adhesion improvers and other customary additives.

The solvent or dispersion medium used for coating the photosensitive layer can be selected from various ones, for example, water, aliphatic alcohols such as methanol, ethanol and propanol, n-hexane, cyclohexane and heptane. , Octane, nonane, hydrocarbons such as decane, diacetone alcohol, 3-methoxy-1-butanol, benzyl alcohol, acetone, methyl ethyl ketone, cyclohexanone, ethylene glycol, diethylene glycol, ethylene glycol monoacetate, ethylene glycol alkyl ethers and the like Acetate (methyl cellosolve, ethyl cellosolve, butyl cellosolve,
Ethylene glycol dimethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate), diethylene glycol monoalkyl ethers and their acetates (diethylene glycol monomethyl ether, diethylene glycol monomethyl ether acetate), diethylene glycol dialkyl ethers (diethylene glycol diethyl dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, diethylene glycol methyl) Ethyl ether), triethylene glycol alkyl ethers (monomethyl ether, monoethyl ether, dimethyl ether, diethyl ether, methyl ethyl ether), propylene glycol alkyl ethers and their acetates (monomethyl ether) Monoethyl ether, n-propyl ether, monobutyl ether, dimethyl ether, diethyl ether, monomethyl ether acetate, monoethyl ether acetate), dipropylene glycol alkyl ethers (monomethyl ether, monoethyl ether, n-propyl ether, monobutyl ether, dimethyl ether , Diethyl ether), ethyl formate, propyl formate, butyl formate, amyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, carboxylate esters such as methyl propionate, ethyl propionate, methyl butyrate, ethyl butyrate, dimethyl Examples include formamide, dimethylsulfoxide, dioxane, tetrahydrofuran, methyl lactate, ethyl lactate, methyl benzoate, ethyl benzoate and the like. These solvents or dispersion media can be used alone or in combination of two or more.

The concentration of these solvents or dispersion media is generally from about 0.1% to about 25% by weight, more preferably from 1 to 25% by weight.
It is in the range of 15% by weight.

As a method of forming a mat by adding a matting agent to the photosensitive layer, the matting agent is mixed in a coating solution for forming the photosensitive layer, coated on a support, and dried to form a surface of the photosensitive layer. Can be matted. Specifically, the photosensitive layer component and the matting agent are formed into a coating solution using the above-described solvent or dispersion medium, and various supports such as a doctor coat, a roller coat, a gravure coat, a dip coat, and a die coat are formed on the support described above. It is achieved by using and applying.

The drying of the photosensitive layer after coating in the present invention can be carried out in a conventional manner, and is carried out by evaporating the solvent or the dispersion medium at room temperature to high temperature. The range of the drying temperature is usually about 20C to about 150C, preferably 50C to 120C. As a preferred embodiment of the photosensitive printing plate of the present invention, a photosensitive printing plate in which the uppermost layer of the photosensitive layer and another photosensitive layer are coated by a wet-on-wet method can be mentioned. That is, the uppermost layer of the photosensitive layer is a state in which another photosensitive layer is applied and applied in an undried state. The reason for this is that the printing durability of the lower photosensitive layer tends to decline due to the repetition of the drying process for each application, and the durability of the printing plate itself is reduced due to the synergistic effect with the deterioration of the printing durability caused by the falling off of the matting agent. Therefore, it is desirable to adopt a method that can reduce the number of drying steps as much as possible.

[2] Method for Producing a Photosensitive Printing Plate A method for producing a photosensitive printing plate of the present invention is characterized in that the above-mentioned uppermost layer and another photosensitive layer are applied by a wet-on-wet method. I do.

The wet-on-wet method means that the photosensitive layer applied on the support is in a wet state, and an adjacent uppermost photosensitive layer coating solution is applied. For example, the coating is carried out using a die coater of the type shown in FIGS. 1A to 1C, and the photosensitive layer coating liquid remaining before the support coated with the first photosensitive layer enters the drying zone process. Is usually applied at the same time as when the first photosensitive layer is applied, or within 5 seconds even when the first photosensitive layer is applied sequentially. In FIG. 1, 1
Is a support moving in the direction of the arrow, 2 and 3 are an upper layer and a lower layer of the photosensitive layer coated on the support 1, respectively, or 4 is provided with a liquid reservoir 5 and is a die coater for coating the photosensitive layer. is there. In FIG. 1, (a) is a type in which an interval is provided between the upper layer and the lower layer when coating, (b) is a type in which the upper layer is coated immediately after the lower layer is coated, and (c) is a type in which the upper layer and the lower layer are coated. Indicates a type in which simultaneous multilayer coating is performed.

In the present invention, the term “wet state” refers to a state in which the solvent applied to the support together with the coating solution for the photosensitive layer remains on the support. It means that the residual ratio is 10% by weight or more in the state before the process.

After being applied by a wet-on-wet method, the photosensitive printing plate of the present invention is obtained by drying by the above-mentioned drying method. By adopting this coating method, the photosensitive printing plate has an effect of having good printing durability.

[0027]

EXAMPLES The present invention will be described below in detail with reference to examples, but embodiments of the present invention are not limited thereto.

Example 1 An aluminum plate (material: 1050, tempered H16) having a thickness of 0.3 mm was degreased in a 5% aqueous sodium hydroxide solution maintained at 65 ° C. for 1 minute, and then washed with water. It was immersed in a 10% aqueous sulfuric acid solution kept at a temperature of 1 ° C. for 1 minute for neutralization, and further washed with water. This aluminum plate was placed in a 1.0 wt% hydrochloric acid aqueous solution at a temperature of 25 ° C. and a current density of 100 A / d.
Electrolytic surface roughening was performed with an alternating current under the conditions of m ² and a processing time of 60 seconds. Next, a desmut treatment is performed in a 5% aqueous sodium hydroxide solution at 60 ° C. for 10 seconds.
Anodizing was performed in a 20% sulfuric acid solution at a temperature of 20 ° C., a current density of 3 A / dm ² , and a processing time of 1 minute. afterwards,
30% in a 1% aqueous solution of sodium nitrite maintained at 80 ° C.
After immersion for 2 seconds, the substrate was washed with water and dried at 80 ° C for 3 minutes. In addition, 8
After immersing for 30 seconds in an aqueous solution of carboxymethylcellulose (concentration: 0.1 wt%) kept at 5 ° C,
After drying for minutes, a support was prepared.

(Coating solution A for photosensitive layer for upper layer) Novolak resin (molar ratio of phenol / m-cresol / p-cresol is 10/54/36, weight average molecular weight 4000) 6.7 g pyrogallol acetone resin (weight average molecular weight 3000) ) And o-naphthoquinonediazide-5-sulfonyl chloride condensate (esterification ratio 30%) 1.5 g polyethylene glycol # 2000 0.2 g Victoria Pure Blue BOH (manufactured by Hodogaya Chemical Co., Ltd.) 0.08 g 2,4- Bis (trichloromethyl) -6- (p-methoxystyryl) -S-triazine 0.15 g FC-430 (manufactured by Sumitomo 3M Co., Ltd.) 0.03 g Polymer compound 1 0.2 g Cross-linked polymethyl methacrylate particles ( Average particle size 3 μm) 0.13 g cyclohexanone / methyl ethyl ketone = 70/3 100 ml (Coating solution B for photosensitive layer for lower layer) Novolak resin (same as above) 6.7 g Pyrogallol acetone resin (same as above) 1.5 g Polyethylene glycol # 2000 0.2 g Victoria Pure Blue BOH (manufactured by Hodogaya Chemical Co., Ltd.) 0.08 g 2 , 4-bis (trichloromethyl) -6- (p-methoxystyryl) -S-triazine 0.15 g FC-430 (manufactured by Sumitomo 3M) 0.03 g polymer compound 1 0.2 g cyclohexanone / methyl ethyl ketone = 70 / 30 100 ml polymer compound 1 By a conventionally known synthesis method, benzyl methacrylate / 4-hydroxyphenyl methacrylamide / acrylonitrile / methyl methacrylate / methacrylic acid =
Polymerization is carried out at a ratio of 30/20/30/15/5 to obtain the following polymer compound 1.

[0030]

Embedded image

(Preparation of Photosensitive Lithographic Printing Plate) On the above support, a photosensitive layer coating solution B for lower layer and a coating solution A for photosensitive layer for upper layer were applied as shown in FIG.
While the lower layer was in a wet state using a two-slit die coater, the upper layer was applied by a wet-on-wet method and dried at 80 ° C. for 1 minute to produce a photosensitive lithographic printing plate 1. The dry thickness of the photosensitive layer is 1 μm for both the upper and lower layers.
Met.

In the photosensitive lithographic printing plate 1, a photosensitive lithographic printing plate 2 was prepared in the same manner as described above except that SiO ₂ particles (average particle size: 3 μm) whose surfaces were hydrophobized were used in place of the cross-linked polymethyl methacrylate particles. Produced.

The lower photosensitive layer coating solution B was coated on the support using a one-slit die coater.
After drying for 1 minute, the photosensitive layer coating solution A for upper layer was
It was applied using a slit die coater and dried at 80 ° C. for 1 minute to produce a photosensitive lithographic printing plate 3. The dry thickness of the photosensitive layer was 1 μm for both the upper and lower layers.

Further, the following photosensitive layer coating solution C was applied using a one-slit die coater and dried at 80 ° C. for 1 minute.
A photosensitive lithographic printing plate 4 was produced. The dry thickness of the photosensitive layer was 2 μm.

(Photosensitive Layer Coating Solution C) Novolak resin (phenol / m-cresol / p-cresol molar ratio: 10/54/36, weight average molecular weight 4000) 6.7 g pyrogallol acetone resin (weight average molecular weight 3000) Condensate of o-naphthoquinonediazide-5-sulfonyl chloride (esterification rate 30%) 1.5 g polyethylene glycol # 2000 0.2 g Victoria Pure Blue BOH (manufactured by Hodogaya Chemical Co., Ltd.) 0.08 g 2,4-bis ( Trichloromethyl) -6- (p-methoxystyryl) -S-triazine 0.15 g FC-430 (manufactured by Sumitomo 3M) 0.03 g Polymer compound 1 0.2 g Cross-linked polymethyl methacrylate particles (average particle size) 0.13 g cyclohexanone / methyl ethyl ketone = 70/30 10 A photosensitive lithographic printing plate 5 was prepared in the same manner except that 0 ml of the photosensitive lithographic printing plate 4 was replaced with SiO ₂ particles (average particle size: 4 μm) whose surface was hydrophobized in place of the cross-linked polymethyl methacrylate particles. .

The photosensitive lithographic printing plates 1 to 5 thus obtained
Were subjected to the following treatments and evaluations.

<Processing and Evaluation> (Vacuum adhesion) 1003 of the above photosensitive lithographic printing plates 1 to 5
A sample having a size of 800 mm × 800 mm was prepared, and the time required for bringing a film original of 900 mm × 600 mm size into close contact using a burning frame was confirmed.

(Printing durability) A step tablet for sensitivity measurement (No. 2, manufactured by Eastman Kodak Co., Ltd., gray scale of 21 steps with a density difference of 0.15 each) was closely attached to the photosensitive lithographic printing plates 1 to 5. A 4Kw metal halide lamp (Vio Quick manufactured by Dainippon Screen Co., Ltd.) was used as a light source and exposed from a distance of 90 cm. Next, the photosensitive lithographic printing plate was washed with SDR-1 (manufactured by Konica) developer in water for 6 hours.
Development was performed at 30 ° C. for 12 seconds with a developer diluted twice. The obtained lithographic printing plate was converted to a printing machine GT manufactured by Heidelberg Co., Ltd.
O, coated paper, printing ink (New Bright Red manufactured by Toyo Ink Mfg. Co., Ltd.) and fountain solution (Konica SE
U-3; 2.5%), and printing was continued until an inking failure appeared on the solid portion of the printed image, and the number of printed sheets at that time was counted.

(Developability) The photosensitive lithographic printing plates 1 to 5 were processed in the same manner as in the printing durability. The obtained lithographic printing plate was visually judged based on the following criteria whether or not a spot-like defective development was present in the halftone portion of the step tablet.

・ ・ ・: No spot-like defective development is observed. ×: Spot-like defective development is observed.

The results obtained are shown in Table 1 below.

[0042]

[Table 1]

As is apparent from Table 1, the photosensitive printing plate of the present invention has improved printing durability and developability of the photosensitive layer while maintaining sufficient vacuum adhesion to the original film. I understand.

Example 2 (Sample 1) A photosensitive lithographic printing plate prepared in the same manner as the photosensitive lithographic printing plate 1 of Example 1
Prepared. Lay these 30 sheets on top and bottom, about 0.5m thick
m cardboards were stacked one by one, taped at four locations, wrapped in aluminum kraft paper, and further covered with a cardboard case and taped. The packed photosensitive lithographic printing plate was subjected to a transport test by truck, and it was visually confirmed whether or not the photosensitive layer surface was damaged by the transport.

・ ・ ・: No scratches on the photosensitive layer surface are observed. X: Scratches are formed on the photosensitive layer surface.

(Sample 2) A photosensitive lithographic printing plate prepared in the same manner as Sample 1 except that the crosslinked polymethyl methacrylate particles were removed from the photosensitive layer coating solution A for the upper layer of the photosensitive lithographic printing plate 1 The surface of the photosensitive layer was confirmed.

(Sample 3) 30 photosensitive lithographic printing plates of 1003 × 800 size prepared in the same manner as in Sample 2 were prepared. These 30 sheets are overlapped with each other with the interleaving paper on the surface of the photosensitive layer, and about 0.5 cardboard (interleaving paper) with a thickness of about 0.5 is stacked one by one on the top and bottom, and taped at four places. And wrapped in a cardboard case and taped. For the packed photosensitive lithographic printing plate, Sample 1
A similar test was performed.

The results obtained are shown below.

Sample 1... Sample 2... Sample 3.

As is clear from the obtained results, it is understood that the photosensitive printing plate of the present invention (sample 1) can obtain a sufficient effect without using the slip sheet. However, the photosensitive printing plate containing no matting agent (Sample 2) has a scratch on the surface of the photosensitive layer under the same conditions, indicating that it is not suitable for practical use.

[0051]

According to the present invention, a remarkably excellent effect is obtained in that the photosensitive printing plate is excellent in vacuum adhesion between the film original and the printing durability and developability of the photosensitive layer. In addition, there is also an effect that the photosensitive layer surface can be prevented from being damaged during transportation or the like without using a slip sheet.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a wet-on-wet method in which coating is performed using a die coater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support 2 Upper layer of photosensitive layer 3 Lower layer of photosensitive layer 4 Die coater 5 Liquid reservoir

Claims (3)

[Claims] 1. A photosensitive material comprising a plurality of photosensitive layers on a support, wherein the uppermost layer contains a matting agent having an average particle size larger than the dry thickness of the uppermost layer. Photosensitive printing plate. 2. The method according to claim 1, wherein the uppermost layer and another photosensitive layer are wet-type.
The photosensitive printing plate according to claim 1, wherein the photosensitive printing plate is applied by an on-wet method. 3. The method according to claim 1, wherein the uppermost layer and another photosensitive layer are wet-coated.
A method for producing a photosensitive printing plate, which is applied by an on-wet method.