JPH043866B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a processing solution for waterless lithography, and particularly to a processing solution for waterless lithography that has excellent base processing and developability at low temperatures. It is. [Prior Art] Various types of waterless lithographic printing plates comprising a photosensitive layer and a silicone rubber layer are known. In particular, by base-treating an image-forming laminate consisting of a support and a photosensitive layer containing a substance containing a quinonediazide structure and a silicone rubber layer provided in this order, water-free negative and positive amphoteric types can be obtained. The method for obtaining a lithographic printing plate is described in Japanese Patent Application Laid-Open No. 59-17552.
As disclosed in , the development latitude of waterless lithographic printing plates including image reproducibility, solvent resistance, developability, etc. has been expanded, and negative and positive plates can be made from the same plate material. It has excellent characteristics. The base treatment methods described in these patents include using an inorganic base or an organic base alone or in a mixture in a gas phase or liquid state, and in the case of a liquid state, using water or a known organic solvent as a solvent. is proposed. Among the processing liquids for waterless lithography according to these prior art techniques, a basic processing liquid consisting of an organic solvent and an organic base is preferably used. however,
At low temperatures such as in winter, the effect of base treatment is significantly reduced, resulting in drawbacks such as longer processing times and lower developability. Furthermore, due to insufficient base treatment, there are also drawbacks such as scratches in the silicone rubber layer in non-image areas and partial peeling. [Problems to be Solved by the Invention] As a result of intensive studies aimed at improving these problems, the present inventors found that a treatment liquid mainly containing a polar solvent and a specific amine is suitable. reached. The purpose of the present invention is to provide a processing solution for waterless lithographic plate making that increases the effect of base treatment at low temperatures, shortens processing time, suppresses peeling of non-image areas, and has good developability. It is something. [Means for Solving the Problems] That is, the present invention provides a plate-making process for a waterless lithographic plate in which a photosensitive layer containing a substance containing a quinonediazide structure and a silicone rubber layer are coated on a support in this order. The present invention relates to a waterless lithographic processing solution, characterized in that the processing solution mainly consists of a polar solvent and an amine represented by the following general formula []. where R: an alkyl group having 1 to 10 carbon atoms n: an integer of 1 to 5 The waterless lithographic platemaking processing liquid according to the present invention is used when a waterless lithographic printing original plate is pretreated after exposure and prior to development. It is used as a developer, but it can also be used as it is as a developer. It is also used for processing after development. The organic amine represented by the above general formula [] is
It has good compatibility with polar solvents and has a large base treatment effect at low temperatures. Amines that can be used in the present invention include N
-Methylethanolamine, N-ethylethanolamine, N-n-butylethanolamine, 3
-hydroxypropylmethylamine, 4-hydroxybutylmethylamine, and the like. As the polar solvent used in the treatment liquid of the present invention, the following can be used alone or in combination. Alcohols (methanol, ethanol, n-
Propanol, isopropanol, 3-methoxybutanol, 3-methyl-3-methoxybutanol, 2-methylpentanol-1, diacetone alcohol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, propylene glycol, polypropylene glycol, hexylene glycol,
octylene glycol, etc.). Ethers (dioxane, tetrahydrofuran, methyl cellosolve, ethyl cellosolve, butyl cellosolve, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol di-n-butyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol di-n-butyl ether, triethylene glycol dimethyl ether) , triethylene glycol diethyl ether, triethylene glycol di-n-butyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether , polypropylene glycol monomethyl ether, etc.). Ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, acetonylacetone, etc.). Among the above-mentioned polar solvents, the following general formula [] RO-(CH ₂ CH ₂ O-) _o R [] where R: alkyl group having 1 to 10 carbon atoms n: polarity represented by an integer from 1 to 6 Solvents, such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol di-n-butyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol di-n-
Butyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol di-n-butyl ether, tetraethylene glycol dimethyl ether, and tetraethylene glycol diethyl ether are preferably used. Regarding the amount of amine added to the processing solution, it is effective to add 0.1 to 50% by weight based on the polar solvent in terms of the expression of the base treatment effect and image reproducibility, especially 0.5 to 35% by weight. is most preferred. When used as a treatment liquid, a surfactant may be added to the treatment liquid to improve wettability and solubility of the amine component. In addition, when developing as is with a processing solution, in order to improve the plate inspection properties, for example, Neptiyun Blue Base 627 (manufactured by BASF), Eisen Victoria Blue BH, Eisen Marine, etc.
A dye such as RNX (manufactured by Hodogaya Chemical Co., Ltd.) can also be added to the treatment solution. In addition, an aliphatic hydrocarbon (hexane, heptane, gasoline, kerosene, "Isopar" H, etc.) or water may be added to the treatment liquid in an amount of 40% by weight or less based on the polar solvent. The supports used in the present invention are not particularly limited, but include those used in ordinary waterless lithographic printing plates,
Alternatively, any of the proposed methods may be used. Examples include metal plates such as aluminum, iron, and zinc; transparent or opaque plastic films such as polyester, polyolefin, and polystyrene; and composites of both. It is also possible to further coat these sheets with a resin layer or the like for prevention of halation or other purposes to form a support. The photosensitive layer referred to in the present invention is composed of a substance containing a known quinonediazide structure, and the substance containing a quinonediazide structure is one commonly used in positive PS plates, Wipon plates, photoresists, etc. They are quinonediazides. Such quinonediazides include, for example, benzoquinone-1,2-diazide-4- or -5-
Esters of sulfonic acid and polyhydroxyphenyl, esters of naphthoquinone-1,2-diazide-4- or -5-sulfonic acid and pyrogallolacetone resin, naphthoquinone-1,2-diazide-4- or -5-sulfone Esters of acids and phenol formaldehyde novolac resins or oak-modified novolac resins may be mentioned. Also, low molecular weight quinonediazide compounds (for example, naphthoquinone-1,2-diazide-5-sulfonic acid,
esters with phenol, cresol, xylenol, catechol, pyrogallol, bisphenol A, etc.) or novolak resins that do not contain photosensitive groups in the resins containing the above quinonediazide groups (e.g., phenol, cresol, xylenol, catechol, pyrogallol, etc.) (such as a soluble resin obtained by condensing phenols and formaldehyde in the presence of an acidic catalyst) may be simply mixed. Furthermore, JP-A-56-
Examples include a photoreleasable photosensitive layer in which quinone diazides are crosslinked with a polyfunctional compound, as proposed in Japanese Patent No. 80046. As a crosslinking agent, polyfunctional isocyanates,
For example, paraphenylene diisocyanate, 2,
4- or 2,6-tolylene diisocyanate,
4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate or adducts thereof, etc.
Or polyfunctional epoxy compounds, such as polyethylene glycol diglycidyl ethers, polypropylene glycol diglycidyl ethers,
Examples include bisphenol A diglycidyl ether and trimethylolpropane triglycidyl ether. It is preferable that these thermal curing be carried out at a temperature of 130° C. or less, which is such that the photosensitivity of the photosensitive material is not lost, and for this reason, a catalyst or the like is usually used in combination. In addition, methods for modifying quinonediazides by reacting them with monofunctional compounds to make them poorly soluble or insoluble in developing solutions include esterifying, amidating, or urethanizing the active groups of the quinonediazides. Can be mentioned. The compound to be reacted with the active group of the quinonediazide may be a low-molecular compound or a relatively high-molecular compound, or a monomer may be graft-polymerized to the quinonediazide. A particularly preferred photosensitive layer for use in the present invention is naphthoquinone-1,2-diazide-5-
It is obtained by crosslinking or modifying a partially esterified product of sulfonic acid and phenol formaldehyde novolak resin with a polyfunctional or monofunctional isocyanate. The thickness of the photosensitive layer is about 0.1-100μ, preferably about 0.5
~10μ is appropriate. If it is too thin, defects such as pinholes are likely to occur during coating, while if it is too thick, it is disadvantageous from an economic standpoint. Further, it is possible to add other components to the photosensitive layer for the purpose of improving coating film forming properties and adhesion to the support within a range that does not impair the effects of the present invention. The silicone rubber layer used in the present invention is preferably one whose main component is a linear organic polysiloxane having the following repeating units and having a molecular weight of several thousand to several hundred thousand. Here, n is an integer of 2 or more, and R and R' have 1 carbon number.
-10 alkyl groups, alkenyl groups or phenyl groups, and those in which 60% or more of R and R' are methyl groups are preferred. A crosslinking agent is usually added to this linear organic polysiloxane. Crosslinking agents used in so-called room temperature (low temperature) curing silicone rubber include acetoxysilane, ketoxime silane, alkoxysilane, aminosilane, amidosilane, etc., and are usually linear organic polysiloxanes with hydroxyl groups at the ends. In combination with these, silicone rubbers of the deacetate type, oxime type, alcohol deal type, deamine type, and deamid type are obtained, respectively. A small amount of an organic tin compound or the like may be added as a catalyst to these silicone rubbers. The appropriate thickness of the silicone rubber layer is approximately 0.5 to 100μ, preferably approximately 0.5 to 10μ; if it is too thin, it may cause problems in terms of printing durability, while if it is too thick, it is economically disadvantageous. Not only this, but also it becomes difficult to remove the silicone rubber layer during development, resulting in a decrease in image reproducibility. In the printing plate used in the present invention, the adhesion between the support and the photosensitive layer, and between the photosensitive layer and the silicone rubber layer is as follows:
Since it is very important for basic plate performance such as image reproducibility and printing durability, it is possible to provide an adhesive layer between each layer or add adhesion-improving ingredients to each layer as necessary. It is. In particular, it is effective to provide a known silicone primer or silane coupling agent layer between the layers, or to add a silicone primer or silane coupling agent to the silicone rubber layer or photosensitive layer, in order to increase the adhesive strength between the photosensitive layer and the silicone rubber layer. be. A thin protective film can also be laminated on the surface of the waterless lithographic printing original plate constructed as described above. The waterless lithographic printing plate precursor used in the present invention is
For example, it is manufactured as follows. First, coat the support with a reverse roll coater, an air knife coater,
Using an ordinary coater such as a Meyer bar coater or a spin coating device such as a Whaler, the composition solution to form the photosensitive layer is applied, dried, and if necessary heat cured, and then coated on the photosensitive layer if necessary. After drying, apply a silicone gum solution on the photosensitive layer or adhesive layer in the same manner as above, and heat-treat it for several minutes at a temperature of usually 50 to 130°C to fully cure it. to form a silicone rubber layer. If necessary, cover the silicone rubber layer with a protective film using a laminator or the like. When the waterless lithographic printing original plate thus obtained is subjected to image exposure using a positive film, a positive original image, or a negative film or a negative original image, and then developed, a waterless lithographic printing plate is obtained. Examples of the plate-making method for such a waterless lithographic printing original plate include the following. For example, when used as a positive waterless lithographic printing original plate, 5 to 60 mol% of the quinonediazide units of the substance containing the quinonediazide structure in the photosensitive layer are photodecomposed by actinic light through a vacuum-adhered positive film or positive original. By applying imagewise exposure as described above and performing base treatment and development, a waterless lithographic printing plate is obtained. On the other hand, when used as a negative-working waterless lithographic printing original plate, it is subjected to normal image exposure with actinic rays through a vacuum-adhesive negative film or negative original (60 mol% of the quinonediazide units of the substance containing the quinonediazide structure in the photosensitive layer). A waterless lithographic printing plate can be obtained by applying an amount of light that exceeds the amount of light that causes photolysis, and then developing after base treatment, developing simultaneously with base treatment, or performing base treatment after development. More preferably, 5 to 60 mol% of the quinonediazide units of the substance containing the quinonediazide structure in the photosensitive layer in the non-image area is photodecomposed before or after normal image exposure or after development, including the image area. Full-surface exposure, development after base treatment, development at the same time as base treatment,
Alternatively, a base treatment may be performed after development. The light sources used in this exposure process are those that generate abundant ultraviolet light, and include mercury lamps, carbon arc lamps, xenon lamps, metal halide lamps,
You can use fluorescent lights, etc. Furthermore, in addition to ultraviolet rays, laser light and the like can also be used. The base treatment method using the treatment liquid of the present invention includes:
The following methods may be mentioned. A Negative type (1) Full surface exposure → Image exposure → Base treatment → Development (2) Image exposure → Full surface exposure → Base treatment → Development (3) Full surface exposure → Image exposure → Base treatment at the same time as development (4) Image exposure → Full surface Exposure → Development and base treatment at the same time (5) Full surface exposure → Image exposure → Development → Base treatment (6) Image exposure → Full surface exposure → Development → Base treatment (7) Image exposure → Development → Full face exposure → Base treatment (8) Image Exposure → development → base treatment (9) Image exposure → base treatment → development (10) Image exposure → development and simultaneous base treatment B Positive type (1) Image exposure → base treatment → development The processing method is as follows: Alternatively, the plate surface can be uniformly wetted with the processing liquid using a brush or pad, or the plate surface can be wetted using a shower method such as in an automatic developing machine. The treatment time is not particularly limited and can be appropriately selected depending on the strength and concentration of the amine compound, but usually the effect appears immediately upon contact with the treatment solution, and there is no change in the effect even if the treatment solution is contacted for a long time. Usually about 10 seconds~
It only takes about 5 minutes. As the developer used in the processing solution of the present invention, those commonly proposed for waterless lithographic printing plates can be used. For example, water, water to which the following polar solvents are added, and aliphatic hydrocarbons (hexane, heptane, gasoline, kerosene, etc.) to which the following polar solvents are added are suitable. Alcohol (methanol, ethanol, etc.) Ethers (ethyl cellosolve, ethyl carbitol, butyl carbitol, etc.) Esters (cellosolve acetate, carbitol acetate, etc.) It is also possible to directly develop with the processing solution of the present invention. When the surface of the base-treated plate is rubbed with a developer pad or a brush using the developer described above, the silicone rubber layer in the exposed area is removed and the ink receiving area is removed when used as a negative waterless lithographic printing original plate. The photosensitive layer becomes exposed. On the other hand, when using it as a positive waterless lithographic printing original plate, the silicone rubber layer in the unexposed area is removed and the photosensitive layer that will become the ink receiving area is exposed. The present invention will be explained in more detail below with reference to Examples. [Examples] Examples 1 and 2, Comparative Examples 1 and 2 The following primer composition was applied to an aluminum plate (manufactured by Sumitomo Light Metal Co., Ltd.) with a thickness of 0.3 mm, and heat treated at 200°C for 2 minutes to form a 5μ thick aluminum plate. A primer layer was provided. Polyurethane resin (Sample LQ-T1331,
Sanyo Chemical Industries, Ltd.) 100 parts by weight Blocked isocyanate (Takenate B830,
Takeda Pharmaceutical Co., Ltd.) 20 parts by weight Epoxy/phenol/urea resin (SJ9372,
(Manufactured by Kansai Paint Co., Ltd.) 8 parts by weight Dimethylformamide 725 parts by weight Next, the following photosensitive layer composition was coated on this using a bar coater, dried for 1 minute in hot air at 110°C, and a photosensitive layer with a thickness of 2 μm was formed. Layers were set up. Naphthoquinone-1,2-diazide-5-sulfonic acid and phenol formaldehyde novolak resin (manufactured by Sumitomo Durez: Sumilight Resin)
PR50622) partial ester (degree of esterification 25% by elemental analysis) 100 parts by weight 4,4'-diphenylmethane diisocyanate
40 parts by weight Dibutyltin diacetate 0.2 parts by weight 4,4'-diethylaminobenzophenone
5 parts by weight P-toluenesulfonic acid 0.8 parts by weight Tetrahydrofuran 800 parts by weight Next, a silicone rubber composition having the following composition was spin-coated on the photosensitive layer, and then heated at 115°C and a dew point of 30.
C. for 3.5 minutes to form a 2.3μ silicone rubber layer. Polydimethylsiloxane (molecular weight approximately 25,000,
(terminal OH group) 100 parts by weight Vinyltri(methylethylketoxime)silane 8 parts by weight Dibutyltin diacetate 0.1 part by weight γ-Aminopropyltrimethoxysilane
0.5 parts by weight “Isopar” E (manufactured by Exxon Chemical Co., Ltd.)
1400 parts by weight Add a layer of 10μ thick to the laminate obtained as above.
polypropylene film “Torefane” (Toray Industries, Ltd.)
Co., Ltd.) was laminated using a calendar roller to obtain a waterless lithographic printing original plate. A metal halide lamp (Idol Fin 2000, manufactured by Iwasaki Electric Co., Ltd.) was used on the original printing plate, and a UV meter (manufactured by Oak Seisakusho, light measure type) was used.
The entire surface was exposed to UV-402A) at an illuminance of 11 mw/cm ² for 6 seconds. 150 lines /
A negative film having an inch halftone dot image was vacuum-adhered, and the image was exposed for 60 seconds from a distance of 1 m using the metal halide lamp mentioned above. Next, the "Trephan" of the exposed plate was peeled off and immersed in a flat vat filled with processing solutions having various compositions listed in Table 1 at a solution temperature of 14° C. for the time shown in Table 1. After immersion, use a rubber squeegee to remove the processing solution adhering to the plate surface and back surface, and then apply developer solution (water/butyl carbitol/2
-Ethylbutyric acid/crystal violet=70/
30/2/0.2 weight ratio) and lightly rubbed the plate surface with a developing pad, the silicone rubber layer in the image-exposed area was removed and the surface of the photosensitive layer was exposed. On the other hand, in the area where only the entire surface was exposed, the silicone rubber layer remained firmly, and an image faithfully reproducing the negative film was obtained. This printing plate was attached to an offset printing machine, and printing was performed using "Toyo King Ultra TKU Aquares G Eye PL" manufactured by Toyo Ink Co., Ltd. to evaluate halftone dot reproducibility. Table 1 shows the halftone reproducibility. As is clear from Table 1, in the case of Examples 1 and 2 based on the present invention, the halftone dot reproducibility was good despite the low temperature conditions, and no minute defects due to damage to the printing plate were observed. On the other hand, with the processing solution using a combination of polar solvent and amine used in Comparative Example 1, the halftone reproducibility was extremely poor, and due to insufficient base treatment, there were dots and scratches on the non-image areas (solid white areas) of the printed matter. Some defects occurred. Furthermore, when the processing time was increased as in Comparative Example 2, the halftone dot reproducibility was good and no defects due to damage to the printing plate were observed, but compared to when the processing liquid of the present invention was used, the halftone dot reproducibility was 3.5% higher than when the processing liquid of the present invention was used. It required a processing time that was twice to seven times longer, and the workability was extremely poor. Example 3 The entire surface of the lithographic printing original plate obtained in Example 1 was exposed to light for 6 seconds at an illuminance of 11 mw/cm ² using a metal halide lamp. A gradation negative film having 150 lines/inch and halftone dots from 1% to 99% is vacuum-adhered to the waterless lithographic printing original plate obtained by the above-mentioned entire surface exposure,
60 from a distance of 1m using a metal halide lamp
The image was exposed for seconds. Next, the cover film was peeled off, and diethylene glycol dimethyl ether/diethylene glycol dimethyl ether/
N-methylethanolamine = 92/8 (weight ratio)
It was immersed for 1 minute in a treatment solution consisting of: After immersion, the developing pad was impregnated with the above-mentioned processing solution and the plate surface was rubbed to remove the image-exposed silicone rubber layer and expose the photosensitive layer. On the other hand, the silicone rubber layer remains firmly in the area where only the entire surface was exposed. This printing plate was attached to an offset printing machine, and "WLP" manufactured by Osaka Ink Co., Ltd.
When printed using "Process U Beni", halftone dots of 2 to 98% were reproduced despite the low-temperature processing conditions, and no minute defects due to damage to the printing plate were observed.Example 4 A gradation positive film having halftone dots of 2% to 98% of 150 lines/inch was vacuum-adhered to a waterless lithographic printing original plate which had not been fully exposed to light in the same manner as in Example 1 according to a conventional method. Example 1
Using the metal halide lamp used in Example 1, the UV meter used in Example 1 at a distance of 1 m measured 11 mW/
Exposure was performed for 9 seconds at an illumination intensity of cm ² . Next, the cover film was peeled off, and diethylene glycol dimethyl ether/diethylene glycol dimethyl ether/
N-methylethanolamine = 92/8 (weight ratio)
Immerse for 1 minute in a flat pad filled with a treatment solution consisting of: After immersion, use a rubber squeegee to remove the processing solution adhering to the plate surface and back surface, and then rub the plate surface with a developer pad soaked with developer solution (water/butyl carbitol = 40/60 weight ratio) to remove the silicone in the unexposed areas. The rubber layer is removed and the surface of the photosensitive layer is exposed.
An image portion was formed. On the other hand, the silicone rubber layer in the exposed area remained without being immersed in the developer, forming a non-image area. When this printing plate was used for printing under the same conditions as in Example 1, the halftone reproducibility was 5% to 96%, and printed matter was obtained without minute defects or defects such as scratches caused by the developer pad. Example 5 Phenol formaldehyde novolac resin (Sumitomo Durez Co., Ltd.: Sumilite Resin) with a degree of esterification of 44% was applied to a chemically treated aluminum plate (Sumitomo Light Metal Co., Ltd.).
PR50235) naphthoquinone-1,2-diazide
5-sulfonic acid ester (ethanol soluble component)
A 3% by weight dioxane solution of 9.7% by weight (degree of esterification determined from IR spectrum) was spin-coated using a Whaler and dried at 60°C for 3 minutes to obtain a photosensitive layer with a thickness of 1.2μ. On this photosensitive layer was added a 7% Isopar E solution of a silicone gum composition having the following composition:
4% by weight of γ-aminopropyltriethoxysilane (manufactured by UCC: A1100) was added to the silicone composition, stirred uniformly, and then coated with a Whaler. After drying, the mixture was cured by heating at 120° C., dew point 25° C., for 4 minutes to obtain a silicone rubber layer with a thickness of 2.2 μm. Polydimethylsiloxane (molecular weight approximately 80,000,
(OH groups at both ends) 100 parts by weight Ethyltriacetoxysilane 5 parts by weight Butyltin diacetate 0.2 parts by weight A negative film having a halftone dot image of 150 lines/inch was applied to the waterless lithographic printing original plate obtained as above under vacuum. The film was brought into close contact with the film, and image exposure was performed for 60 seconds from a distance of 1 m using the metal halide lamp used in Example 1.
When the surface of the exposed plate is lightly rubbed with a developer consisting of ethanol/Isopar E = 80/20 (weight ratio), both the silicone rubber layer and the photosensitive layer are easily removed from the image-exposed area, resulting in chemical conversion. The treated aluminum surface was exposed, resulting in an image that faithfully reproduced the negative film. Using a metal halide lamp, the above-mentioned plate was measured using the UV meter of Example 1 at a distance of 1 m.
After exposing the entire surface to light for 10 seconds under an illuminance of mw/cm ² (the amount of light at which 25 mol% of quinone diazide in the photosensitive layer photodecomposes and generates a carboxylic acid component), ethanol/
It was immersed for 1 minute in a treatment solution consisting of "ISOPAR" E/N-methylethanolamine = 63/30/7 (weight ratio), washed with water and dried. In order to confirm whether the obtained plate was sufficiently fixed by the base treatment, the entire surface was exposed to light for 60 seconds from a distance of 1 m using the metal halide lamp mentioned above, and then ethanol/"Isopar E" = 80/20 ( The silicone rubber layer in the non-image area was not damaged at all even when it was rubbed with a developing pad impregnated with a developer consisting of (weight ratio), and the fixing effect of the base treatment was sufficient. Example 6 A waterless lithographic printing original plate was prepared in exactly the same manner as in Example 5 except that the photosensitive liquid was replaced with the following composition. Namely, naphthoquinone-1,2-diazide-5- of phenol formaldehyde novolak resin.
A photosensitive solution was prepared by dissolving 8 parts by weight of sulfonic acid ester and 2 parts by weight of phenol novolak resin in 200 parts by weight of dioxane. The thickness of the photosensitive layer is 1.7
g/ ^m2 . Next, an unfixed printing plate was made in the same manner as in Example 5. This plate was entirely exposed for 10 seconds using the metal halide lamp described in Example 1. Next, it was immersed for 1 minute in a treatment solution consisting of ethanol/"Isopar" E/N-methylethanolamine = 63/30/7 (weight ratio), washed with water, and dried. When it was confirmed whether fixing was performed in the same manner as in Example 5, it was found that the silicone rubber layer in the non-image area was not damaged at all. That is, the non-image area was completely fixed. [Effect of the invention] The processing liquid for waterless lithography according to the present invention provides
The following effects are achieved. (1) The base treatment effect is strong even at low temperatures such as winter, and sharp images can be reproduced without damaging the silicone rubber layer in non-image areas. (2) Processing time can be shortened and work efficiency can be improved. 【table】

Claims (1)

[Scope of Claims] 1. A processing liquid for plate making of a waterless lithographic plate in which a photosensitive layer containing a substance containing a quinonediazide structure and a silicone rubber layer are coated on a support in this order, wherein the processing liquid has a polarity. A processing liquid for waterless lithographic platemaking, characterized in that it mainly consists of a solvent and an amine represented by the following general formula []. Here, R: an alkyl group having 1 to 10 carbon atoms; n: an integer of 1 to 5; 2. The waterless lithographic processing liquid according to claim 1, wherein the polar solvent is represented by the following general formula []. RO—(CH ₂ CH ₂ O—) _o R [] where R: alkyl group having 1 to 10 carbon atoms n: an integer of 1 to 6.