JPH0971060A - Photosensitive planographic form plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve plate wearability, unstainable property of non-image areas, and hardness of generation of fine dots when printing is stopped, by providing a photosensitive composition layer on a support body and forming the support body out of an aluminum plate which is roughened and anodized and has a surface having a specified range of total area of a diagram to be formed specifically. SOLUTION: A support body is formed of an aluminum plate comprising a pure aluminum plate. The aluminum plate is roughened and anodized and a photosensitive composition layer is provided. As for its surface state, a reference linear line is drawn in parallel with the center line of the roughness at 1μm below from a top of a mountain which is third in height of a two-dimensional surface roughness curve having a measured wavelength of 0.5mm. The total area of the diagram to be formed by the reference linear line and the roughness curve higher than the reference linear line is set to 50-150μm<2> . The roughening treatment and anodization treatment are not particularly limited, but a mechanical roughening method and an electrochemical roughening method can be used for the roughening treatment.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a photosensitive lithographic printing plate and a method for producing a photosensitive lithographic printing plate.

[0002]

BACKGROUND OF THE INVENTION A photosensitive lithographic printing plate has a photosensitive layer provided on a hydrophilic support, and is provided with a layer of a positive photosensitive composition on the support. There is a negative-working photosensitive lithographic printing plate in which a layer of a negative-working photosensitive composition is provided on a support.

Conventionally, the support used for these photosensitive lithographic printing plates is required to have excellent hydrophilicity and water retention property and excellent adhesiveness to the photosensitive layer from the viewpoint of printability. Has been done.

In order to meet these requirements, a support for a photosensitive lithographic printing plate usually uses an aluminum plate whose surface has been subjected to a roughening treatment called graining. These surface-roughening treatment methods include mechanical surface-roughening methods such as ball polishing, brush polishing, blast polishing, buff polishing, and honing polishing, and the surface of the support by alternating current or direct current in an acidic electrolytic solution such as hydrochloric acid or nitric acid. There is known an electrochemical surface-roughening method for electrolytically treating a.

Since the aluminum plate which has been grained by these methods has a soft surface and is easily worn as it is, it is anodized after the graining to form an oxide film. The surface of the aluminum plate treated in this way is hard and has excellent wear resistance, but in recent years, printing under various printing conditions has been required, and under all of these printing conditions, non-image areas are not printed. Was not sufficient to satisfy the stain resistance and printing durability.

[0006] In recent years, printed matter has a good finish,
High quality has been demanded, and so-called high-definition printing has become popular. In these high-definition printing, small dot reproducibility has been demanded, and in an aluminum plate grained by the above-mentioned conventional method, when trying to improve small dot reproducibility, the water width deteriorates, It was difficult to achieve both water width and small point reproducibility. Further, the dot gain and the K value did not reach a level that satisfied them.

It has been proposed to carry out a hydrophilizing treatment after the anodizing treatment in order to improve the stain on the non-image area of the photosensitive lithographic printing plate. For example, in JP-A-56-21126, a method of providing an undercoat layer composed of a hydrophilic resin and a water-soluble salt,
In JP-A-64-14090, a method of providing an undercoat layer made of a carboxylate is disclosed, and in JP-A-63-130391, at least one amino group and at least one selected from a carboxyl group and a sulfo group. A method of providing a hydrophilic layer comprising at least one selected from an inorganic acid salt and an organic acid salt of a compound having a group is disclosed in JP-A-63-165183, which has at least one amino group and a phosphon group or a phosphon group. There has been proposed a method of providing a hydrophilic layer containing the salt. However, if the hydrophilic treatment is applied by these methods to improve the stain on the non-printing area, the printing durability is deteriorated, and the stain on the non-printing area cannot be improved without deteriorating the printing durability. It was

Further, if the printing machine is stopped for a while during printing to perform registration, breaks, etc., fine dot-like stains will occur when printing is resumed, but these drawbacks cannot be ameliorated. It was

It has been proposed to ameliorate the above-mentioned drawbacks by making the surface shape of the support of the photosensitive lithographic printing plate specific. For example, U.S. Pat.No. 4,301,229 defines the cumulative frequency distribution of pit diameters and the center line average roughness of the surface of the support, and U.S. Pat.No. 3,861,917 defines the depth of the rough surface of the support. Canadian Patent No. 955,44
No. 9 specification defines the height and diameter of the peaks of the rough surface of the support, and German Patent No. 1,813,443 defines the height difference of the rough surface of the support, JP-A-55-132294. In JP-A-5-24376, it is proposed to specify the average depth of the surface of the support, and to specify the pit diameter on the surface of the support and the maximum depth in the direction perpendicular to the diameter. It was not sufficient to improve both the stain resistance and the non-image area stain. In particular, it was not sufficient to eliminate fine dot-like stains that occur when printing is restarted.

The present inventors improve the printing durability, the stain on the non-image area, the stain on the fine dots when the printing is restarted, and the water retention by forming the protrusions on the rough surface into a specific shape. It was found that it is possible to improve the developing property, the small point reproducibility, the dot gain, the K value, the developing property, and the stop stain.

[0011]

SUMMARY OF THE INVENTION A first object of the present invention is to improve the printing durability and to prevent the non-image area from being smeared, especially in the form of light-sensitive lithographic printing which is unlikely to cause fine dot-like dirt after printing is stopped. To provide a version.

A second object of the present invention is to provide a photosensitive lithographic printing plate which improves the dot reproducibility while maintaining the water retention property of the support.

A third object of the present invention is to obtain a dot gain, K
It is to provide a photosensitive lithographic printing plate having an improved value.

[0014]

Accordingly, the first object of the present invention is: (1) In a photosensitive lithographic printing plate comprising a support and a layer of the photosensitive composition, the support has a measurement length of 0.5 mm. Area of a figure formed by a reference line drawn parallel to the center line of roughness 1 μm below the apex of the third highest mountain of the two-dimensional surface roughness curve and a roughness curve above the reference line Is 50μ
A photosensitive lithographic printing plate, which is an aluminum plate having a surface of m ² or more and 150 μm ² or less, which has been subjected to a roughening treatment and an anodization treatment. (2) In a photosensitive lithographic printing plate in which a layer of a photosensitive composition is provided on a support, the support is 3 μm from the apex of the third highest peak of a two-dimensional surface roughness curve having a measurement length of 0.5 mm. The total area of the figure formed by the reference straight line drawn parallel to the center line of the roughness below and the roughness curve below the reference straight line is 50μ.
A photosensitive lithographic printing plate which is an aluminum plate having a surface of m ² or more and 250 μm ² or less and which has been subjected to a roughening treatment and an anodization treatment. (3) In a photosensitive lithographic printing plate in which a layer of a photosensitive composition is provided on a support, the support is 1 μm from the apex of the third highest peak of a two-dimensional surface roughness curve having a measurement length of 0.5 mm. The total area of the figure formed by the reference straight line drawn parallel to the center line of the roughness below and the roughness curve above the reference straight line is 50μ.
m ² or more and 150 μm ² or less, and is formed by a reference straight line drawn parallel to the center line of roughness 3 μm below the apex of the third highest mountain and a roughness curve below the reference straight line A photosensitive lithographic printing plate, which is an aluminum plate that has been subjected to a roughening treatment and an anodizing treatment and has a surface having a total area of figures of 50 μm ² or more and 250 μm ² or less. (4) In a photosensitive lithographic printing plate in which a layer of a photosensitive composition is provided on a support, the support is an aluminum plate that has been subjected to surface roughening treatment and anodization, and the surface is roughened. If the surface morphology of the aluminum plate is 100 μm × 100 μm, the difference in height between the highest point and the lowest point of the rough surface is
A rough surface of the aluminum plate that is 6.0 μm or more and 10.0 μm or less, and is a plane parallel to the center plane of the roughness at a position 70 from the lowest point side when the height difference between the highest point and the lowest point is 100. A photosensitive lithographic printing plate characterized in that an area of an island portion formed in a cross section when the converted surface is cut is 1000 μm ² or more and 2000 μm ² or less. (5) When the roughened surface of the aluminum plate is cut by a plane parallel to the center plane of the roughness at the position 70 from the lowest point side when the height difference between the highest point and the lowest point is 100. The photosensitive lithographic printing plate as described in (4) above, wherein the number of island portions formed in the cross section is 10 or more and 50 or less within a range of 100 μm × 100 μm. (6) In a photosensitive lithographic printing plate in which a layer of a photosensitive composition is provided on a support, the support is an aluminum plate that has been subjected to surface roughening treatment and anodization, and the surface is roughened. If the surface morphology of the aluminum plate is 100 μm × 100 μm, the difference in height between the highest point and the lowest point of the rough surface is
A rough surface of the aluminum plate that is 6.0 μm or more and 10.0 μm or less and is a plane parallel to the center plane of roughness at the position 50 from the lowest point side when the height difference between the highest point and the lowest point is 100. reduction has been an area of sea to be formed in the cross section obtained by cutting the surface, a photosensitive lithographic printing plate, characterized in that at 1500 .mu.m ² or more 3000 .mu.m ² or less. (7) When the roughened surface of the aluminum plate is cut with a plane parallel to the center plane of the roughness at the position 50 from the lowest point side, where the height difference between the highest point and the lowest point is 100. The photosensitive lithographic printing plate as described in (6) above, wherein the number of sea parts formed in the cross section is 10 or more and 50 or less within a range of 100 μm × 100 μm.

The second object of the present invention is: (8) In a photosensitive lithographic printing plate comprising a support and a layer of the photosensitive composition provided thereon, the support has a surface roughness Ra of 0.6.
A roughened aluminum plate having a surface of Rm of 3.5 μm or more and 0.9 μm or less and Rz of 3.5 μm or more and 6.0 μm or less, anodized, and a layer of a photosensitive composition applied on the aluminum plate. Then, a method for producing a photosensitive lithographic printing plate is characterized by further comprising a step of smoothing the surface of the photosensitive composition layer. (9) In a photosensitive lithographic printing plate having a layer of a photosensitive composition provided on a support, the support has a surface roughness Ra of 0.6.
A surface-roughened and anodized aluminum plate having a surface with a Rz of 3.5 μm or more and 0.9 μm or less and a Rz of 3.5 μm or more and 6.0 μm or less, and the surface roughness of the layer of the photosensitive composition is Ra. Is 0.1 μm or more and 0.35 μm or less, and Rz is 0.7 μm or more and 2.2 μm or less. (10) The photosensitive lithographic printing plate as described in (9) above, wherein the surface roughness of the layer of the photosensitive composition is from 0.1 μm to 0.2 μm in Ra and from 0.7 μm to 1.1 μm in Rz. (11) In a photosensitive lithographic printing plate in which a layer of a photosensitive composition is provided on a support, the support is an aluminum plate that has been subjected to a surface roughening treatment and an anodizing treatment, and the surface is roughened. The surface morphology of the formed aluminum plate is 100 μm × 100 μm
Within the range of, the height difference between the highest point and the lowest point of the rough surface is 6.0 μm or more and 10.0 μm or less, and when the difference in height between the highest point and the lowest point is 100, the lowest point side The projection area of the rough surface portion of the aluminum plate surface in the range surrounded by the plane parallel to the center plane of roughness at the position of 50 and the plane parallel to the center plane of the roughness at position of 70 is 6000 μm ²
A photosensitive lithographic printing plate characterized by the above.

The third object of the present invention is: (12) In a photosensitive lithographic printing plate comprising a support and a layer of the photosensitive composition provided thereon, the support undergoes a roughening treatment and an anodizing treatment. The number of pits on the surface of the aluminum plate formed by electrochemical graining is 0.5 μm or more and 2.0 μm or less, and the opening diameter is 0.1 μm or more and 2.0 μm or more. A photosensitive lithographic printing plate comprising 80% or more of the number of pits within a range of μm or less. Can be achieved by:

Hereinafter, the present invention will be described in detail.

The aluminum plate used for the support of the photosensitive lithographic printing plate of the present invention includes a pure aluminum plate and an aluminum alloy plate. Various kinds of aluminum alloys can be used, for example, silicon, copper, manganese,
Alloys of aluminum with metals such as magnesium, chromium, zinc, lead, bismuth, nickel, titanium, sodium and iron are used.

In the present invention, the aluminum plate is preferably subjected to a degreasing treatment in order to remove the rolling oil on the surface before roughening. Examples of the degreasing treatment include a degreasing treatment using a solvent such as trichlene or thinner, and an emulsion degreasing treatment using an emulsion such as kesilon or triethanol. In the degreasing treatment, an aqueous solution of an alkali such as caustic soda can be used. When an alkaline aqueous solution such as caustic soda is used for the degreasing treatment, dirt and oxide film that cannot be removed by the above degreasing treatment alone can also be removed.

When an alkaline aqueous solution such as caustic soda is used for the degreasing treatment, smut is formed on the surface of the support. In this case, therefore, acid such as phosphoric acid, nitric acid, sulfuric acid, chromic acid, or a mixed acid thereof is used. It is preferable to perform immersion and desmut treatment.

In the present invention, the surface of the aluminum plate on which the photosensitive composition layer is provided by subjecting the aluminum plate to surface roughening treatment and anodizing treatment is as follows: (1) Two-dimensional surface roughness with a measurement length of 0.5 mm The total area of the figure formed by the reference straight line drawn parallel to the center line of roughness 1 μm below the apex of the third highest peak of the height curve and the roughness curve above the reference straight line (hereinafter, Area A.) is 50μ
It should be m ² or more and 150 μm ² or less. (2) A reference straight line drawn parallel to the roughness center line 3 μm below the third highest peak of the two-dimensional surface roughness curve with a measurement length of 0.5 mm, and a roughness curve below the reference straight line The total area of the figure formed by and (hereinafter referred to as area B) is 50μ.
It should be more than m ² and less than 250 μm ² . (3) The area A is 50 μm ² or more and 150 μm ² or less, and the area B is 50 μm ² or more and 250 μm ² or less. (4) Surface morphology within the range of 100 μm × 100 μm
The height difference between the highest point and the lowest point of the rough surface is 6.0μm or more 10.0μ
When the height difference between the highest point and the lowest point is 100 or less, and the height difference between the highest point and the lowest point is 100, the roughened surface of the aluminum plate is a plane parallel to the center plane of the roughness at the position 70 from the lowest point side. The area (hereinafter referred to as area C) of the island portion (the portion where the protrusion exists) formed in the cross section when cut is 1000 μm ² or more
2000μm ² or less. (5) When the roughened surface of the aluminum plate is cut by a plane parallel to the center plane of the roughness at the position 70 from the lowest point side when the height difference between the highest point and the lowest point is 100. The number of islands formed on the cross section is 10 or more and 50 or less within the range of 100 μm × 100 μm. (6) In the range of 100 μm × 100 μm, the surface morphology is
The height difference between the highest point and the lowest point of the rough surface is 6.0μm or more 10.0μ
When the height difference between the highest point and the lowest point is 100 m or less, and the height difference between the highest point and the lowest point is 100, the roughened surface of the aluminum plate is a plane parallel to the center plane of the roughness at the position 50 from the lowest point side. area of the sea portion to be formed in the cross section obtained by cutting the (portion where the protrusion does not exist) (hereinafter, referred to as area D.) is referred to as 1500 .mu.m ² or more 3000 .mu.m ² or less. (7) When the roughened surface of the aluminum plate is cut with a plane parallel to the center plane of the roughness at the position 50 from the lowest point side, where the height difference between the highest point and the lowest point is 100. The number of divided sea parts formed in the cross section of 100 μm × 10
Within the range of 0 μm, it is 10 or more and 50 or less. (8) Surface roughness Ra is 0.6 μm or more and 0.9 μm or less, and Rz is
3.5 μm or more and 6.0 μm or less. (9) In the range of 100 μm × 100 μm, the surface morphology is
The height difference between the highest point and the lowest point of the rough surface is 6.0 μm or more 10.0 μ
When the height difference between the highest point and the lowest point is 100 or less and the height difference between the highest point and the lowest point is 100, the plane parallel to the center plane of the roughness at the position 50 from the lowest point side and the center plane of the roughness at the position 70 The projected area of the rough surface portion of the aluminum plate surface in the range surrounded by the plane parallel to is 6000 μm ² or more. (10) The number of pits on the surface of the aluminum plate formed by electrochemical graining, which has an opening diameter of 0.5 μm or more and 2.0 μm or less, is in the range of 0.1 μm or more and 2.0 μm or less. 80% or more of the number of pits.

The roughening treatment and the anodizing treatment used for obtaining the above-mentioned morphology of the surface of the aluminum plate are not particularly limited, but the roughening treatment includes a mechanical roughening treatment method, an electric Chemical surface roughening methods can be used.

The mechanical surface roughening method used is not particularly limited, but a brush polishing method and a honing polishing method are preferable. Roughening by the brush polishing method
Rotate the rotating brush using 0.2-0.8 mm brush bristles,
For example, a brush can be pressed against the surface of the support while supplying a slurry in which particles of volcanic ash having a particle size of 10 to 100 μm are uniformly dispersed in water. Roughening by honing polishing, for example, the particles of volcanic ash with a particle size of 10 ~ 100 (mu) m is uniformly dispersed in water, injected by applying pressure from a nozzle,
Roughening can be performed by obliquely colliding with the surface of the support. Further, for example, on the support surface, abrasive particles having a particle size of 10 to 100 μm, the abrasive particles are 100 to 200 μm apart,
It is also possible to carry out roughening by laminating sheets coated so as to exist at a density of 2.5 × 10 ³ to 10 × 10 ³ pieces / cm ² and applying pressure to transfer the rough surface pattern of the sheet.

After the surface is roughened by the above-mentioned mechanical surface-roughening method, it is used in the mechanical surface-roughening method, and in order to remove the abrasives, the aluminum scraps and the like formed on the surface of the support, an acid or Immersion in an aqueous alkali solution is preferred. Examples of the acid include sulfuric acid, persulfuric acid, hydrofluoric acid, phosphoric acid, nitric acid,
Hydrochloric acid or the like is used, and examples of the base include sodium hydroxide, potassium hydroxide and the like. Among these, it is preferable to use an aqueous alkali solution. The amount of aluminum dissolved on the surface is preferably 0.5 to 5 g / m ² .

After the immersion treatment with an aqueous alkali solution,
It is preferable to immerse in an acid such as phosphoric acid, nitric acid, sulfuric acid, and chromic acid or a mixed acid thereof to perform a neutralization treatment.

The electrochemical surface-roughening method used is not particularly limited, but a method of electrochemically surface-roughening in an acidic electrolyte is preferable. As the acidic electrolytic solution, an acidic electrolytic solution usually used for an electrochemical graining method can be used, but a nitric acid-based electrolytic solution is preferably used. As the electrochemical surface-roughening method, for example, the methods described in JP-B-48-28123, British Patent 896,563, and JP-A-53-67507 can be used.

Electrochemical graining methods generally range from 1 to 50.
It can be carried out by applying a voltage in the range of Volt, but it is preferable to select the applied voltage from the range of 10 to 30 Volt in order to make the form of the surface of the aluminum plate the form of the present invention. Current density may be in the range of 10 to 200 A / dm ^2, the form of the surface of the aluminum plate to the embodiment of the present invention is preferably selected from the range of 50 to 150 A / dm ^2. The amount of electricity may be in the range of 100 to 5000 c / dm ² , but in order to make the form of the aluminum plate surface the form of the present invention, 100 to 2000 c / dm ² ,
Furthermore, it is preferable to select from the range of 200 to 1000 c / dm ² .
The temperature for carrying out the electrochemical graining method can be used in the range of 10 to 50 ° C., but in order to make the form of the aluminum plate surface the form of the present invention, it is selected from the range of 15 to 45 ° C. Is preferred.

When electrochemical graining is performed using a nitric acid-based electrolyte as the electrolyte, it can be generally performed by applying a voltage in the range of 1 to 50 V. In order to form the embodiment of the present invention, it is preferable to select the applied voltage from the range of 10 to 30 volts. Current density may be in the range of 10 to 200 A / dm ^2, the form of the surface of the aluminum plate to the embodiment of the present invention is preferably selected from the range of 20 to 100 A / dm ^2. The amount of electricity may be in the range of 100 to 5000 c / dm ² , but in order to make the form of the surface of the aluminum plate the form of the present invention, 100 to 2000 c / dm ² , and further 20
It is preferable to select from the range of 0 to 1000 c / dm ² . The temperature for carrying out the electrochemical graining method can be used in the range of 10 to 50 ° C., but in order to make the form of the aluminum plate surface the form of the present invention, it is selected from the range of 15 to 45 ° C. Is preferred.

The nitric acid concentration in the electrolytic solution is 0.1 to 5% by weight.
Is preferred. If necessary, nitrate, chloride, amines, aldehydes, phosphoric acid, chromic acid, boric acid, acetic acid, oxalic acid and the like can be added to the electrolytic solution.

When electrochemical surface roughening is carried out using a hydrochloric acid-based electrolytic solution as the electrolytic solution, it can be generally carried out by applying a voltage in the range of 1 to 50 V. In order to make the embodiment of the present invention, it is preferable to select the applied voltage from the range of 2 to 30 volts. Current density may be in the range of 10 to 200 A / dm ^2, the form of the surface of the aluminum plate to the embodiment of the present invention is preferably selected from the range of 50 to 150 A / dm ^2. The amount of electricity may be in the range of 100 to 5000 c / dm ² , but in order to make the form of the surface of the aluminum plate the form of the present invention, 100 to 2000 c / dm ² , and further 20
It is preferable to select from the range of 0 to 1000 c / dm ² . The temperature for carrying out the electrochemical graining method can be used in the range of 10 to 50 ° C., but in order to make the form of the aluminum plate surface the form of the present invention, it is selected from the range of 15 to 45 ° C. Is preferred.

The concentration of hydrochloric acid in the electrolytic solution is 0.1 to 5% by weight.
Is preferred. If necessary, nitrate, chloride, amines, aldehydes, phosphoric acid, chromic acid, boric acid, acetic acid, oxalic acid and the like can be added to the electrolytic solution.

After the surface is roughened by the above-mentioned electrochemical surface roughening method, it is preferable to immerse it in an aqueous solution of acid or alkali in order to remove aluminum scraps and the like on the surface. As the acid, for example, sulfuric acid, persulfuric acid, hydrofluoric acid, phosphoric acid, nitric acid, hydrochloric acid and the like are used, and as the base, for example, sodium hydroxide, potassium hydroxide and the like are used. Among these, it is preferable to use an aqueous alkali solution. The amount of aluminum dissolved on the surface is preferably 0.5 to 5 g / m ² .

After the immersion treatment with an aqueous alkali solution,
It is preferable to immerse in an acid such as phosphoric acid, nitric acid, sulfuric acid, and chromic acid or a mixed acid thereof to perform a neutralization treatment.

The mechanical surface-roughening treatment method and the electrochemical surface-roughening method may be used alone for surface-roughening, or the mechanical surface-roughening method may be followed by the electrochemical surface-roughening method. You may carry out and roughen. The processing conditions in the mechanical surface roughening method or the electrochemical surface roughening method are selected so that the form of the surface of the aluminum plate becomes the form of the present invention. The selection can be done by simple experimentation.

After the roughening treatment, an anodic oxidation treatment is performed.

The method of anodizing treatment that can be used in the present invention is not particularly limited, and a known method can be used. By carrying out the anodizing treatment, an oxide film is formed on the support.

In the present invention, a method of electrolyzing at an electric current density of 1 to 10 A / dm ² using an aqueous solution containing sulfuric acid and / or phosphoric acid or the like at a concentration of 10 to 50% is preferably used for the anodizing treatment. However, in addition, a method of electrolyzing in sulfuric acid at high current density described in U.S. Pat.No. 1,412,768, a method of electrolyzing using phosphoric acid described in U.S. Pat.No. 3,511,661, etc. Can be used.

The support which has been anodized may be subjected to a sealing treatment if necessary. These sealing treatments can be performed by using known methods such as hot water treatment, boiling water treatment, steam treatment, sodium silicate treatment, dichromate aqueous solution treatment, nitrite treatment and ammonium acetate treatment.

It is preferable that the support is further provided with a hydrophilic layer. For the formation of the hydrophilic layer, U.S. Pat.
Alkali metal silicates described in US Pat. No. 1,8
Hydrophilic cellulose described in JP 60,426 A, JP-A-60-1
49491, amino acids and salts thereof described in JP-A-63-165183, amines having a hydroxyl group and salts thereof described in JP-A-60-232998, described in JP-A-62-19494 And the polymer compounds containing a monomer unit having a sulfo group described in JP-A-59-101651 can be used.

Further, in order to prevent scratches on the photosensitive layer when the photosensitive lithographic printing plates are stacked, and to prevent the elution of the aluminum component into the developing solution at the time of development, JP-A-50-1
No. 51136, JP-A-57-63293, JP-A-60-73538, JP-A-61-67863, JP-A-6-35174, etc. The process of providing layers can be performed.

The photosensitive composition used in the photosensitive lithographic printing plate of the present invention is not particularly limited, and the photosensitive composition usually used in the photosensitive lithographic printing plate can be used. Examples of the photosensitive composition that can be used in the present invention include the following. 1) Photocrosslinkable photosensitive resin composition The photosensitive component in the photocrosslinkable photosensitive resin composition comprises a photosensitive resin having an unsaturated double bond in a molecule,
For example, U.S. Pat.Nos. 3,030,208 and 3,435,237
No. 3,622,320, etc., as a photosensitive group in the polymer main chain.

[0042]

Embedded image And polyvinyl cinnamate having a photosensitive group on the side chain of the polymer. 2) Photopolymerizable photosensitive resin composition A photopolymerizable composition containing an addition-polymerizable unsaturated compound, comprising a monomer having a double bond or a monomer having a double bond, and a polymer binder. Representative examples of such a composition are described in, for example, US Pat. Nos. 2,760,863 and 2,791,504.

Examples of the photopolymerizable composition include a composition containing methyl methacrylate, a composition containing methyl methacrylate and polymethyl methacrylate, a composition containing methyl methacrylate, polymethyl methacrylate and polyethylene glycol methacrylate monomers. , A photopolymerizable composition such as a composition containing methyl methacrylate, an alkyd resin and a polyethylene glycol dimethacrylate monomer.

The photopolymerization type photosensitive resin composition contains a photopolymerization initiator (eg, a photopolymerization initiator) usually known in this technical field.
Benzoin derivatives such as benzoin methyl ether, benzophenone derivatives such as benzophenone, thioxanthone derivatives, anthraquinone derivatives, acridone derivatives, etc.)
Is added. 3) Photosensitive composition containing diazo compound Preferred examples of the diazo compound used in the photosensitive composition include diazo resins represented by condensates of an aromatic diazonium salt with formaldehyde or acetaldehyde. Particularly preferably, a salt of a condensate of p-diazophenylamine with formaldehyde or acetaldehyde, for example, a reaction product of the above condensate with hexafluorophosphate, tetrafluoroborate, perchlorate or periodate. Diazo resin inorganic salts, and diazo resin organic salts, which are reaction products of the condensate and sulfonic acids described in US Pat. No. 3,300,309.

The diazo resin is preferably used with a binder. As such a binder, various polymer compounds can be used, and preferably, a polymer is disclosed in JP-A-54-98613.
Monomer having an aromatic hydroxyl group, for example, N- (4-hydroxyphenyl) acrylamide, N- (4-hydroxyphenyl) methacrylamide, o-, m- or p-hydroxystyrene , O
-, A copolymer of m- or p-hydroxyphenyl methacrylate and the like and another monomer, a hydroxyethyl acrylate unit or a hydroxyethyl methacrylate unit described in U.S. Pat.No. 4,123,276 as a main repeating unit Containing polymers, natural resins such as shellac, rosin, polyvinyl alcohol, U.S. Pat.
Examples thereof include linear polyurethane resins described in No. 1,257, phthalated resins of polyvinyl alcohol, epoxy resins which are condensates of bisphenol A and epichlorohydrin, and cellulose derivatives such as cellulose acetate and cellulose acetate phthalate. 4) Photosensitive composition containing o-quinonediazide compound The o-quinonediazide compound is a compound having an o-quinonediazide group in a molecule. Examples of the o-quinonediazide compound that can be used in the present invention include: o-Naphthoquinonediazide compounds, for example, ester compounds of o-naphthoquinonediazidesulfonic acid with phenols and polycondensation resins with aldehydes or ketones.

Examples of the phenols in the polycondensation resin with the above-mentioned phenols and aldehydes or ketones include phenol, o-cresol, m-cresol,
Examples include monohydric phenols such as p-cresol, 3,5-xylenol, carvacrol, and thymol; dihydric phenols such as catechol, resorcinol, and hydroquinone; and trihydric phenols such as pyrogallol and phloroglucin. As the aldehyde, for example, formaldehyde,
Examples include benzaldehyde, acetaldehyde, crotonaldehyde, furfural and the like. Preferred among these are formaldehyde and benzaldehyde. Examples of the ketone include acetone, methyl ethyl ketone, and the like.

Specific examples of polycondensation resins with phenols and aldehydes or ketones include phenol-formaldehyde resin, m-cresol-formaldehyde resin, m-, p-mixed cresol-formaldehyde resin, resorcin-benzaldehyde resin, Examples include pyrogallol / acetone resin.

In the o-naphthoquinonediazide compound, the condensation rate of o-naphthoquinonediazide sulfonic acid with respect to the OH group of phenols (reaction rate with respect to one OH group) is preferably 15% to 80%, more preferably 20%. ~
45%.

Further, as the o-quinonediazide compound used in the present invention, the following compounds described in JP-A-58-43451 can also be mentioned. That is, for example,
-Benzoquinonediazidesulfonic acid ester, 1,2-
Known 1,2- such as naphthoquinonediazidosulfonic acid ester, 1,2-benzoquinonediazidosulfonic acid amide, and 1,2-naphthoquinonediazidosulfonic acid amide
Quinonediazide compounds, more specifically, "Light-Sensitive Systems" by J. Kosar, 339-352 (1965)
Year), John Wille and Sands
y & Sons, Inc. (New York) and WSDe Forest, Photoresist, Vol. 50 (1975); McGraw Hill, New York 1,2-benzoquinonediazide-4-sulfonic acid phenyl ester, 1,2,1 ', 2'-di- (benzoquinonediazide-4-sulfonyl) -dihydroxybiphenyl, 1,2-benzoquinonediazide-4- (N- Ethyl-N-β-naphthyl) -sulfonamide, 1,2-naphthoquinonediazide-5-sulfonic acid cyclohexyl ester, 1- (1,2-naphthoquinonediazide-5-sulfonyl) -3,5-dimethylpyrazole, 2-Naphthoquinonediazide-5-sulfonic acid-4'-hydroxydiphenyl-4'-azo-β-naphthol Tel,
N, N-di- (1,2-naphthoquinonediazido-5-sulfonyl) -aniline, 2 '-(1,2-naphthoquinonediazide-5-sulfonyloxy) -1-hydroxy-
Anthraquinone, 1,2-naphthoquinonediazide-5
Sulfonic acid-2,4-dihydroxybenzophenone ester, 1,2-naphthoquinonediazide-5-sulfonic acid-2,3,4-trihydroxybenzophenone ester, 1,2-naphthoquinonediazide-5-sulfonic acid chloride 2 mol and 4 mol Condensate with 1 mol of 4,4'-diaminobenzophenone, 2 mol of 1,2-naphthoquinonediazide-5-sulfonic acid chloride and 4,4'-dihydroxy-
A condensate with 1 mol of 1,1'-diphenylsulfonic acid,
Condensate of 1 mol of 1,2-naphthoquinonediazide-5-sulfonic acid chloride with 1 mol of purprogalin, 1,2-
A 1,2-quinonediazide compound such as naphthoquinonediazide-5- (N-dihydroabietyl) -sulfonamide can be exemplified. In addition, Japanese Patent Publication No. 37-1953
Nos. 37-3627, 37-13109, 40-26126, 40-
No. 3801, No. 45-5604, No. 45-27345, No. 51-13013,
1,2-quinonediazide compounds described in JP-A-48-96575, JP-A-48-63802, and JP-A-48-63803 can also be mentioned.

Of the above o-quinonediazide compounds,
An o-quinonediazide ester compound obtained by reacting 1,2-benzoquinonediazidosulfonyl chloride or 1,2-naphthoquinonediazidosulfonylchloride with a pyrogallol-acetone condensed resin or 2,3,4-trihydroxybenzophenone is particularly preferred.

In the present invention, as the o-quinonediazide compound, the above compounds may be used alone or in combination of two or more kinds.

The proportion of the o-quinonediazide compound in the photosensitive composition is preferably 5 to 60% by weight, and particularly preferably 10 to 50% by weight.

It is preferable to further add an alkali-soluble resin to the photosensitive composition containing the o-quinonediazide compound.

In the present invention, the alkali-soluble resin which is preferably used in combination with the o-quinonediazide compound is, for example, a novolac resin, a vinyl polymer having a phenolic hydroxyl group, or JP-A-55-57841. Examples thereof include condensation resins of polyphenols with aldehydes or ketones.

Examples of the novolak resin include phenol / formaldehyde resin, cresol / formaldehyde resin, phenol / cresol / formaldehyde copolymer resin as described in JP-A-55-57841, and JP-A-55. Copolymer resins of p-substituted phenol and phenol or cresol and formaldehyde as described in JP-A-127553.

The molecular weight (polystyrene standard) of the novolak resin is preferably such that the number average molecular weight Mn is 3.00 × 10 ^{2 to} 7.5.
0 × 10 ³ , weight average molecular weight Mw is 1.00 × 10 ^{3 to} 3.00 × 10 ⁴ ,
More preferably, Mn is 5.00 × 10 ^{2 to} 4.00 × 10 ³ , and Mw is 3.
00 × 10 ^{3 to} 2.00 × 10 ⁴ .

The above novolak resins may be used alone or in combination of two or more kinds.

When a novolac resin is used in combination, it is preferable that the novolac resin is contained in the photosensitive composition in an amount of 5 to 95% by weight.

The vinyl polymer having a phenolic hydroxyl group is a polymer having a unit having a phenolic hydroxyl group in its molecular structure, and is represented by the following general formula [I] to
A polymer containing at least one structural unit represented by [V] is preferable.

[0060]

Embedded image

In the general formulas [I] to [V], R
₁ and R ₂ each represent a hydrogen atom, an alkyl group or a carboxyl group, preferably a hydrogen atom. R
₃ represents a hydrogen atom, a halogen atom or an alkyl group,
Preferred is a hydrogen atom or an alkyl group such as a methyl group or an ethyl group. R ₄ and R ₅ represent a hydrogen atom, an alkyl group, an aryl group or an aralkyl group, and are preferably a hydrogen atom. A represents an optionally substituted alkylene group connecting a nitrogen atom or an oxygen atom to an aromatic carbon atom, m represents an integer of 0 to 10, and B represents a substituent. Represents a phenylene group which may be substituted or a naphthylene group which may have a substituent.

The vinyl polymer having a phenolic hydroxyl group used in the present invention preferably has a copolymer type structure having structural units represented by the general formulas [I] to [V]. Examples of the monomer to be copolymerized include ethylenically unsaturated olefins such as ethylene, propylene, isobutylene, butadiene, and isoprene, for example, styrene, α-methylstyrene, p
Styrenes such as -methylstyrene and p-chlorostyrene; for example, acrylic acids such as acrylic acid and methacrylic acid; for example, unsaturated aliphatic dicarboxylic acids such as itaconic acid, maleic acid, and maleic anhydride; for example, methyl acrylate , Ethyl acrylate, n-butyl acrylate,
Esters of α-methylene aliphatic monocarboxylic acids such as isobutyl acrylate, dodecyl acrylate, 2-chloroethyl acrylate, phenyl acrylate, α-methyl methyl acrylate, methyl methacrylate, ethyl methacrylate and ethyl ethacrylate For example, nitriles such as acrylonitrile and methacrylonitrile, for example, amides such as acrylamide, for example, anilides such as acrylanilide, p-chloroacrylanilide, m-nitroacrylanilide, and m-methoxyacrylanilide, for example, acetic acid Vinyl esters such as vinyl, vinyl propionate, vinyl benzoate, and vinyl acetate, for example, vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, and β-chloroethyl vinyl ether , Vinyl chloride, vinylidene chloride, vinylidene cyanide, for example, 1-methyl-1-methoxyethylene, 1,1-dimethoxyethylene, 1,2-dimethoxyethylene, 1,1-dimethoxycarbonylethylene, 1-methyl-1- Ethylene derivatives such as nitroethylene, for example, N-vinylpyrrole,
N-vinylcarbazole, N-vinylindole, N-
There are N-vinyl monomers such as vinylpyrrolidene and N-vinylpyrrolidone. These monomers are present in the polymer compound in a structure in which the unsaturated double bond is cleaved.

Of the above monomers, aliphatic monocarboxylic acid esters and nitriles are preferable because they exhibit excellent performance for the purpose of the present invention.

These monomers may be bonded to the polymer used in the present invention in either a block or random state.

When a vinyl polymer having a phenolic hydroxyl group is used in combination, the vinyl polymer having a phenolic hydroxyl group is preferably contained in the photosensitive composition in an amount of 0.5 to 70% by weight.

As the vinyl polymer having a phenolic hydroxyl group, the above polymers may be used alone or in combination of two or more kinds. It can also be used in combination with other polymer compounds.

When an alkali-soluble resin is used in combination, o-
The proportion of the quinonediazide compound in the photosensitive composition is preferably 5 to 60% by weight, particularly preferably 10 to 60% by weight.
50% by weight.

Furthermore, a printout material capable of forming a visible image by exposure can be added to the photosensitive composition of the present invention. Printout materials consist of a compound that generates an acid or a free radical upon exposure to light and an organic dye that changes its color by interacting with the generated acid or a free radical. As the compound, for example, JP-A-50-36209
O-naphthoquinonediazide-4-sulfonic acid halogenide described in JP-A-53-36223, trihalomethyl-2-pyrone and trihalomethyl-triazine described in JP-A-53-36223,
An ester compound or amide compound of o-naphthoquinonediazide-4-sulfonic acid chloride described in JP-A-55-6244 and a phenol or aniline having an electron-withdrawing substituent, JP-A-55-77742, JP-A-57-1
Examples of the halomethyl vinyl oxadiazole compound and diazonium salt described in JP 48784 publication,
Examples of organic dyes include Victoria Pure Blue BOH (Hodogaya Chemical Co., Ltd.), Patent Pure Blue (Sumitomo Mikuni Chemical Co., Ltd.), and Oil Blue #.
603 (manufactured by Orient Chemical Industry Co., Ltd.), Sudan Blue I
I (manufactured by BASF), crystal violet, malachite green, fuchsin, methyl violet, ethyl violet, methyl orange, brilliant green,
Examples thereof include Congo Red, Eosin, Rhodamine 66 and the like.

In addition to the above-mentioned materials, the photosensitive composition of the present invention may further contain a plasticizer, a surfactant, an organic acid, if necessary.
Acid anhydrides and the like can be added.

Further, in order to improve the oil sensitivity of the photosensitive composition of the present invention, for example, p-
tert-butylphenol formaldehyde resin, pn
Octylphenol formaldehyde resins or resins in which these resins are partially esterified with an o-quinonediazide compound can also be added.

The layer of the photosensitive composition of the present invention may be formed by applying a coating solution prepared by dissolving or dispersing the photosensitive composition comprising each of these components in a solvent onto a support and drying it. it can.

Further, an inclusion compound may be added to the photosensitive composition of the present invention.

The inclusion compound that can be used in the present invention is not particularly limited as long as it is a compound capable of incorporating (inclusion) a chemical species, but it is an organic compound soluble in a solvent used for preparing a composition. Is preferred. Examples of such organic compounds include, for example, books such as "Host Guest Chemistry" (written by Michio Hiraoka, Kodansha, 1984, Tokyo) and "Tetrahedron Report" (No.226 (1987) P572).
5A. Collet et al.), "Chemical Industry April Issue" ((1991) P278 Shinkai et al.), "Chemical Industry April Issue" ((1991) P288 Hiraoka et al.) And the like.

Inclusion compounds that can be preferably used in the present invention include, for example, cyclic D-glucans, cyclophanes, neutral polyligands, cyclic polyanions, cyclic polycations, cyclic peptides, SPHERANDS, Included are CAVITANDS and their acyclic analogs. Among these, cyclic D-glucans and acyclic analogs thereof, cyclophanes, and neutral polyligands are more preferable.

Examples of cyclic D-glucans and non-cyclic analogs thereof include compounds in which α-D-glucopyranose is linked by a glycolide bond.

Examples of the compound include starch, amylose, amylopectin, and other sugars composed of D-glucopyranose groups, α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, and polymerization of D-glucopyranose group. Cyclodextrins such as cyclodextrin having a degree of 9 or more, and SO ₃ C ₆ H ₄ CH ₂ C ₆ H ₄
SO ₃ group, NHCH ₂ CH ₂ NH group, NHCH ₂ CH ₂ NH
CH ₂ CH ₂ NH group, SC ₆ H ₅ group, N ₃ group, NH ₂ group, NE
t ₂ group, SC (NH ⁺ ₂ ) NH ₂ group, SH group, SCH ₂ CH
_{2 The following} formula introducing a substituent such as NH ₂ group, imidazole group, ethylenediamine group, etc.

[0077]

Embedded image And modified D-glucans. Moreover, the cyclodextrin derivative represented by the following general formula [IX] and general formula [X], a branched cyclodextrin, a cyclodextrin polymer, etc. are also mentioned.

[0078]

Embedded imageIn the general formula [IX], R₁~ R_ThreeAre the same
May be different, hydrogen atom, alkyl group or substituted
Represents an alkyl group. In particular, R ₁~ R_ThreeIs a hydrogen atom or
Hydroxyethyl group, hydroxypropyl group
Is preferred, and the content of substituted alkyl groups in one molecule is 15%.
It is more preferably about 50%. n₂Is positive from 4 to 10
Represents an integer.

[0079]

Embedded imageIn the general formula [X], R is a hydrogen atom, -R² -CO₂
H, -R² -SO_ThreeH, -R²-NH₂Or -N-
(R^Three)₂(R²Is a straight or branched chain having 1 to 5 carbon atoms.
Represents an alkylene group, R^ThreeIs a straight chain having 1 to 5 carbon atoms or
Represents a branched chain alkyl group.

The production example of cyclodextrin is "JoJo
unal of the American Chemical Society, Vol. 71, No. 3
P. 54, 1949, "Cheimish Berichte", vol. 90, p. 2561
1949, vol. 90, page 2561, 1957, but of course is not limited to these.

The branched cyclodextrin used in the present invention is a known cyclodextrin in which a water-soluble substance such as glucose, maltose, cellobiose, lactose, sucrose, galactose or glucosamine, or a water-soluble substance such as disaccharide is branched or added. And preferably,
Maltosylcyclodextrin in which maltose is bound to cyclodextrin (the number of molecules bound to maltose may be one, two or three) or glucosylcyclodextrin in which glucose is bound to cyclodextrin (the number of molecules bound to glucose) Is one molecule, two molecules,
Or any of three molecules).

Specific methods for synthesizing these branched cyclodextrins are described in, for example, Starch Chemistry, Vol. 33, No. 2, 119.
-126 (1986), 127-132 (1986), starch chemistry,
Vol. 30, No. 2, pp. 231-239 (1983), etc., and can be synthesized with reference to these known methods. For example, maltosyl cyclodextrin can be prepared by using cyclodextrin and maltose as raw materials. And maltose by cyclodextrin using an enzyme such as isoamylase or pullulanase. Glucosylcyclodextrin can be produced in a similar manner.

In the present invention, examples of the branched cyclodextrin preferably used include the following specific exemplified compounds.

[Exemplified Compounds] D-1 α-Cyclodextrin with one molecule of maltose bound D-2 β-Cyclodextrin with one molecule of maltose D-3 γ-Cyclodextrin with one molecule of maltose D-4 malto Α-Cyclodextrin with two molecules of D-sulfate D-5 β-Cyclodextrin with two molecules of maltose D-6 γ-Cyclodextrin with two molecules of maltose D-7 α-Cyclodextrin with three molecules of maltose D-8 β-Cyclodextrin with 3 molecules of maltose D-9 γ-Cyclodextrin with 3 molecules of maltose D-10 α-Cyclodextrin with 1 molecule of glucose D-11 β-with 1 molecule of glucose bonded Cyclodextrin D-12 1 molecule of glucose bound γ-cyclodextrin D-13 α-cyclodextrin with two glucose molecules bonded D-14 β-cyclodextrin with two glucose molecules bonded D-15 Gamma-cyclodextrin with two glucose molecules bonded D-16 glucose three molecules Α-cyclodextrin D-17 bound to β-cyclodextrin with three molecules of glucose D-18 γ-cyclodextrin bound to three molecules of glucose

Regarding the structures of these branched cyclodextrins, HPLC, NMR, TLC (thin layer chromatography), IN
EPT method (Insensitive nuclei enhanced by polarization
transfer) has been studied in various ways,
Even with the current science and technology, it has not yet been finalized and is in the stage of an estimated structure. However, each monosaccharide or 2
The fact that sugars and the like are bound to cyclodextrin is correct in the above measurement method. Therefore, in the present invention, when the monosaccharide or disaccharide polymolecule is bound to cyclodextrin, for example, when individually bound to each glucose of cyclodextrin as shown below, or It includes both those linearly linked to one glucose.

[0086]

[Chemical 6]

In these branched cyclodextrins,
Since the ring structure of the existing cyclodextrin is kept as it is, it shows the same inclusion function as the existing cyclodextrin, and the addition of highly water-soluble maltose or glucose dramatically increases the solubility in water. The feature is that it has improved.

The branched cyclodextrin used in the present invention can be obtained as a commercial product. For example, maltosyl cyclodextrin is commercially available as Isoeryte (registered trademark) manufactured by Shimizu Minato Sugar Co., Ltd.

Next, the cyclodextrin polymer used in the present invention will be described.

As the cyclodextrin polymer used in the present invention, those represented by the following general formula [XI] are preferable.

[0091]

[Chemical 7]

The cyclodextrin polymer used in the present invention can be produced by crosslinking cyclodextrin with, for example, epichlorohydrin to form a crosslinked polymer.

The cyclodextrin polymer preferably has a water solubility, that is, a solubility in water of 20 g or more per 100 ml of water at 25 ° C., for that purpose, the degree of polymerization n ₂ in the above general formula [XI] is 3 to 3. The lower the value, the higher the water solubility of the cyclodextrin polymer itself and the solubilizing effect of the substance.

These cyclodextrin polymers are disclosed, for example, in JP-A-61-97025 and German Patent 3,544,842.
It can be synthesized by a general method described in the specification and the like.

The cyclodextrin polymer may also be used as an inclusion compound of the cyclodextrin polymer as described above.

Cyclophanes are cyclic compounds having a structure in which aromatic rings are connected by various bonds, and many compounds are known. Examples of cyclophanes include these known compounds. it can.

[0097] As the bond connecting an aromatic ring, for example, a single _{bond, - (CR 1 R 2)} m - _{bond, -O (CR 1 R 2)} m O- _{bond, -NH (CR 1 R 2)} m NH − Bond, − (CR ₁ R ₂ ) _p
NR ₃ (CR ₄ R ₅ ) _q -bond,-(CR ₁ R ₂ ) _p N ⁺ R ₃ R ₄
(CR ₅ R ₆ ) _q -bond,-(CR ₁ R ₂ ) _p S ⁺ R ₃ (CR ₄
R ₅ ) _q -bond, -CO ₂ -bond, -CONR-bond (where R ₁ , R ₂ , R ₃ , R ₄ , R ₅ and R ₆ may be the same or different and a hydrogen atom Or an alkyl group having 1 to 3 carbon atoms, and m, p and q may be the same or different, and represent an integer of 1 to 4).

Examples of the compound include compounds represented by the following formulas:

[0099]

Embedded image The following formula represented by paracyclophanes, tri-o-tymotide, and cycloriveratrilene represented by

[0100]

Embedded image The following formula represented by orthocyclophanes, metacyclophphane, calixarene, resorcinol-aldehyde cyclic oligomers represented by

[0101]

Embedded image Metacyclophanes represented by

[0102]

Embedded image Para-substituted phenolic acyclic oligomers represented by

Neutral polyligands include crown compounds, cryptands, cyclic polyamines and their acyclic analogs. The compound is known to effectively incorporate metal ions, but can also effectively incorporate cationic organic molecules.

Other inclusion compounds include urea, thiourea, deoxycholic acid, dinitrodiphenyl, hydroquinone, o-trithymotide, oxyflavan, dicyanoamminenickel, dioxytriphenylmethane, triphenylmethane, methylnaphthalene, spirochroman, Examples include perhydrotriphenylene, clay minerals, graphite, zeolites (faujasite, chabazite, mordenite, levinite, montmorillonite, halosite, etc.), cellulose, amylose, proteins and the like.

These clathrate compounds may be added as a simple substance, but they improve the solubility of the clathrate compound itself or the clathrate compound incorporating the molecule in a solvent and the compatibility with other additives. For this reason, a polymer in which a substituent having an inclusion ability is suspended as a pendant substituent may be added together with the polymer.

Examples of the polymer include those disclosed in JP-A-3-221501, JP-A-3-221502, and JP-A-3-221503.
It can be easily obtained by using a method as disclosed in JP-A-3-221504 and JP-A-3-221505.

Among the above-mentioned clathrate compounds, cyclic and acyclic D-glucans, cyclophanes, and acyclic cyclophane analogs are preferable. More specifically, cyclodextrin, calixarene, resorcinol-aldehyde cyclic oligomer, and para-substituted phenols acyclic oligomer are preferred.

Cyclodextrin and its derivatives are most preferred, and β-cyclodextrin and its derivatives are more preferred.

In the photosensitive lithographic printing plate of the present invention, an aluminum plate is subjected to surface roughening treatment and anodic oxidation treatment so that the surface of the aluminum plate has the above-mentioned specific form, and the above-mentioned photosensitive composition is added. A solvent that can be obtained by applying a coating solution dissolved in a solvent and providing a layer of the photosensitive composition, can be used when dissolving the photosensitive composition.
For example, methyl cellosolve, methyl cellosolve acetate, ethyl cellosolve, ethyl cellosolve acetate,
Diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether, diethylene glycol monoisopropyl ether, propylene glycol, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol Dimethyl ether, dipropylene glycol methyl ethyl ether, ethyl formate, propyl formate, butyl formate, amyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, methyl butyrate, ethyl butyrate, dimethylformamide Dimethyl sulfoxide, dioxane, acetone, methyl ethyl ketone, cyclohexanone, methylcyclohexanone, diacetone alcohol,
Examples include acetylacetone and γ-butyrolactone. These solvents can be used alone or in combination of two or more.

The coating method used when the photosensitive composition is coated on the surface of the support is a conventionally known method, for example, spin coating, wire bar coating, dip coating, air knife coating, spray coating, air spray coating, Methods such as electrostatic air spray coating, roll coating, blade coating and curtain coating are used. At this time, the coating amount varies depending on the application, but for example, a coating amount of 0.05 to 5.0 g / m ² as a solid content is preferable.

An aluminum support which has a surface having an area A of 50 μm ² or more and 150 μm ² or less and which has been subjected to roughening treatment and anodization treatment has a sharp tip shape of the protruding portion on the surface of the support, which makes it photosensitive by printing. When the layer of the composition is abraded, the sharp protrusion tips are exposed to form a wall / columnar structure, so that further abrasion of the layer of the photosensitive composition is prevented, and as a result,
Printing durability is improved. If the area A is larger than 150 μm ² ,
Since the sharpness of the projection tip disappears and the peak of the projection becomes flat, the flat portion of the projection peak is exposed when the layer of the photosensitive composition is abraded, resulting in image loss, and at this point printing fails. It will be appropriate. When the area A is smaller than 50 μm ² , the wall / column structure has insufficient strength, and printing durability is deteriorated.

The aluminum support which has a surface having an area B of 50 μm ² or more and 250 μm ² or less and which has been subjected to the roughening treatment and the anodization treatment has moderate pits with a depth of 3 μm or more. Can be uniformly evaporated, excellent water retention can be obtained, and fine dot-like stains generated when printing is restarted can be improved. Moreover, a wide water width can be maintained.
If the area B is 50 μm ² or less, the above effect cannot be obtained.
When the area B is 250 μm ² or more, deep pits are connected to each other and the effect of uniformly evaporating water cannot be obtained.

As the support, an aluminum plate which has a surface roughness Ra of 0.6 μm or more and 0.9 μm or less and Rz of 3.5 μm or more and 6.0 μm or less and which has been subjected to surface roughening treatment and anodization treatment is used. After applying the layer of the photosensitive composition on the aluminum plate, a step of smoothing the surface of the layer of the photosensitive composition is provided, and the surface roughness Ra of the layer of the photosensitive composition is 0.
1 μm or more and 0.35 μm or less, Rz 0.7 μm or more and 2.2 μm or less,
Further, when Ra is 0.1 μm or more and 0.2 μm or less and Rz is 0.7 μm or more and 1.1 μm or less, excellent small point reproducibility can be obtained while maintaining water retention / wide water width of the support.

The surface roughness of the layer of the photosensitive composition is usually influenced by the surface roughness of the underlying aluminum plate. If the aluminum plate is smooth, the thickness of the layer of the photosensitive composition becomes uniform and smooth. As described above, the dots formed by exposure and development in the layer of the photosensitive composition having a uniform and smooth thickness have a uniform size even if the dots are as small as about 10 μm, and the shape thereof is also a perfect circle. It becomes the shape. As a result, the dot reproducibility is improved. However, the surface roughness of the aluminum plate is Ra 0.6 μm
If it is less than Rz or less than 3.5 μm in Rz, water retention and water width are poor.

When the surface roughness of the aluminum plate becomes rough,
The thickness of the layer of the photosensitive composition becomes uneven and the surface roughness becomes rough. As described above, the dots formed by exposure and development in the layer of the photosensitive composition having a non-uniform thickness and rough surface roughness are influenced by the unevenness of the aluminum plate and the layer of the photosensitive composition as the dots become smaller. , Small dots of about 10 μm have irregular sizes and irregular shapes. As a result, the small point reproducibility is lowered.

The surface roughness Ra of the aluminum plate is 0.6 μm.
When the Rz is 3.5 μm or more and the Rz is 3.5 μm or more and 6.0 μm or less, a step of smoothing the surface roughness after coating the layer of the photosensitive composition is provided, and the surface roughness Ra is 0.1 μm or more.
0.35 μm or less, Rz 0.7 μm or more and 2.2 μm or less, and further,
Ra 0.1 μm to 0.2 μm, Rz 0.7 μm to 1.1 μm
By the following, because it is not affected by the unevenness of the surface of the layer of the photosensitive composition during exposure and development, 10 μm
Even small dots have a uniform size, and the shape is also a clean shape close to a perfect circle, resulting in good small dot reproducibility, and good water retention and water width.

To smooth the surface of the layer of the photosensitive composition, for example, after drying the layer of the photosensitive composition, the drying speed is reduced to level the surface, or the layer of the photosensitive composition is smoothed. After forming, a plate having a smooth surface, for example, a smooth glass plate having Ra of 0.01 μm or less is placed on the surface of the layer of the photosensitive composition, and the plate is allowed to stand under heating and pressure for an appropriate time. Or, after forming the layer of the photosensitive composition, the layer of the photosensitive composition is passed between the metal roll and the resin roll whose surface is a mirror surface so as to contact the metal roll, and an appropriate temperature and pressure are applied. There is a method of carrying out rolling treatment.

A matting agent may be added to the surface of the photosensitive composition after the step of smoothing the surface of the layer of the photosensitive composition.

The number of pits on the surface of the aluminum plate formed by electrochemical graining having an opening diameter of 0.5 μm or more and 2.0 μm or less is in the range of 0.1 μm or more and 2.0 μm or less. The dot gain and K value can be improved by using an aluminum support which has been subjected to a surface roughening treatment and anodization treatment having 80% or more of the number of pits.

The above-mentioned opening diameter is represented by the average opening diameter of the short diameter and the long diameter of the pit observed in the SEM photograph.

By carrying out the printing, the layer of the photosensitive composition on the support is gradually worn away, and finally the apex portions of the protrusions on the surface of the support are exposed. Since the apex portion of the protrusion on the surface of the support has hydrophilicity, the ink does not adhere to the exposed portion, resulting in defective printing. In the case of a support that has many portions near the apex of the protrusions that have a structure close to a plane, when the layer of the photosensitive composition is worn and the protrusions of the support are exposed, the structure near the apex has a structure close to a plane. As a result, the exposed area becomes large at that time, resulting in the noticeable omission of image lines on the printed matter, resulting in improper printing. On the other hand, when the apex portions of the protrusions on the surface of the support have an acute angle structure, even if the apex portions of the protrusions on the surface of the support are exposed due to abrasion of the layer of the photosensitive composition,
The exposed area is small, and at that time, there is almost no effect on the ink deposition on the layer of the photosensitive composition. Moreover, since the exposed protrusions of the support have a structure for supporting the pressure of contact with the blanket, there is an effect of preventing the layer of the photosensitive composition from being further worn away, and the printing durability is greatly improved.

The surface morphology of the roughened aluminum plate has a height difference between the highest point and the lowest point of the rough surface of 6.0 μm or more and 10.0 μm or less in the range of 100 μm × 100 μm,
Area C is 10% or more and 20% or less of 100 μm × 100 μm, that is,
1000 .mu.m ² or more 2000 .mu.m ² graining treatment and anodizing treatment applied aluminum support having at which surface or less,
Since it has protrusions with sharp vertices on the surface of the support,
Excellent printing durability can be obtained.

Furthermore, within the range of 100 μm × 100 μm,
When the island portion forming the cross section is divided and the number of divided island portions is 10 or more and 50 or less, the protrusion apex can be covered with an appropriate water film. The presence of protrusions is sparse, and the number of islands
When it is less than 10, the protrusion apexes are less likely to be covered with the water film, ink is more likely to adhere to the tip of the protrusion from the ink roller, and the adhered ink is transferred to the blanket, so that blanket stains are likely to occur. Further, when the projections are densely present and the number of islands is more than 50, the unevenness in a narrow area is severe, which causes a problem in developability. Further, the difference (Rt) between the highest point and the lowest point in the range of 100 μm × 100 μm needs to be 6.0 μm or more and 10.0 μm. If Rt is less than 6.0 μm, the amount of water that can be retained in the recesses is small even if the area C is within the range, and stains are likely to occur. If the dampening water supply is increased, water loss tends to occur, and Rt is reduced. If it is larger than 10.0 μm, the volume of the recess becomes too large even if the area C is within the range, and if the supply amount of dampening water is reduced, stains are likely to occur. Area C is
10% or more and 20% or less, and the number of areas is 10 or more and 50
By the following, a photosensitive lithographic printing plate excellent in printing durability and developability can be obtained.

The surface morphology of the roughened aluminum plate has a height difference between the highest point and the lowest point of the rough surface of 6.0 μm or more and 10.0 μm or less in the range of 100 μm × 100 μm,
The area D is 15% or more and 30% or less of 100 μm × 100 μm, that is,
1500 .mu.m ² or more 3000 .mu.m ² graining treatment and anodizing treatment applied aluminum support having at which surface or less,
Since the surface of the support has appropriate depressions, the water held therein is dried appropriately, stains are less likely to occur on the non-image area, and the reproducibility of small dots is excellent. If the area D is less than 15%, the amount of water that can be retained in the recesses is small, and the drying proceeds quickly, so that stains are likely to occur. If the area D is more than 30%, the overall roughness becomes too coarse and the reproducibility of small dots deteriorates. Also, 100 μm x 10
The difference (Rt) between the highest point and the lowest point in the range of 0 μm is 6.0 μm
It is necessary that the thickness is 10.0 μm or more. If Rt is less than 6.0 μm, the amount of water that can be retained in the recesses is small even if the area D is within the range, and stains are likely to occur. If it is larger than 10.0 μm, the volume of the recess becomes too large even if the area D is within the range, and if the supply amount of dampening water is reduced, stains are likely to occur.

Furthermore, within the range of 100 μm × 100 μm,
The sea area that forms the cross section is divided, and if the number of sea areas that are divided is 10 or more and 50 or less, it has a good effect on the drying of the dampening water, and fine spots that are likely to occur when printing is restarted. Can be stopped. The existence of Kaifu is sparse, and the number of
When it is less than 10, the portion between the concave portions is dried more quickly, and the effect of preventing fine dot-like stains is weakened. When the number of sea areas is high and the number is more than 50, the unevenness in the narrow area is severe and the developability becomes a problem. Area D
Is 15% or more and 30% or less, and the number of areas is 10 or more
When it is 50 or less, a photosensitive lithographic printing plate excellent in fine dot stains and developability can be obtained.

The surface morphology of the roughened aluminum plate has a height difference between the highest point and the lowest point of the rough surface of 6.0 μm or more and 10.0 μm or less within the range of 100 μm × 100 μm,
Moreover, when the difference in height between the highest point and the lowest point is 100, a plane parallel to the center plane of roughness at the position 50 from the lowest point side and a plane parallel to the center plane of roughness at the position 70. Within a range of 100 μm × 100 μm, the projected area of the rough surface portion of the aluminum plate in the area surrounded by (the area of the area excluding the area C and the area D from the measurement range) is 60% or more, that is, , 6000 μm ² or more, the portions other than the protruding portions and the concave portions (pit portions) of the support are flat, and the film thickness of the layer of the photosensitive composition becomes uniform even when viewed microscopically, and Small dots can be formed neatly, and small dot reproducibility is improved. If it is less than 60%, the shape of small dots on the plate cannot be formed neatly, and the dot reproducibility deteriorates. Further, the difference (Rt) between the highest point and the lowest point in the range of 100 μm × 100 μm needs to be 6.0 μm or more and 10.0 μm. When Rt is less than 6.0 μm, even if the projected area of the rough surface portion of the aluminum plate is within the above range, the amount of water that can be retained in the recesses is small, stains are likely to occur, and the amount of dampening water supplied. When Rt is larger than 10.0 μm, the volume of the concave portion becomes too large even if the projected area of the rough surface portion of the aluminum plate surface is within the above range, and the dampening water is increased. If the supply amount is reduced, stains easily occur.

In the present invention, (1) a reference straight line drawn parallel to the roughness center line 1 μm below the apex of the third highest peak of a two-dimensional surface roughness curve having a measurement length of 0.5 mm, and the reference straight line The total area of the figure formed with the roughness curve above (area A). (2) Roughness 3 μm below the 3rd highest peak of the two-dimensional surface roughness curve with a measurement length of 0.5 mm. (3) Surface roughness (Ra and Rz) of the figure formed by the reference straight line drawn in parallel with the center line of R and the roughness curve below the reference straight line (3) Surface roughness (Ra and Rz) (4) Aluminum Opening diameter and number of pits on plate surface (5) Height difference between maximum and minimum points of rough surface of aluminum plate (Rt) (6) Height of maximum point and minimum point of rough surface of aluminum plate When the difference (Rt) is set to 100, 70 from the lowest point side
Area (area C) and number of islands formed in the cross section when the roughened surface of the aluminum plate is cut along a plane parallel to the center plane of roughness at the position (7) Aluminum plate When the difference in height (Rt) between the highest point and the lowest point of the rough surface is 100, 50 from the lowest point side
The area (area D) of the sea part and the number of sea parts formed in the cross section when the roughened surface of the aluminum plate is cut by a plane parallel to the center plane of the roughness at the position (8) When the height difference (Rt) between the highest point and the lowest point of the rough surface is 100, 50 from the lowest point side
The projected area of the rough surface portion of the aluminum plate surface in the range enclosed by the plane parallel to the center plane of roughness at the position of and the plane parallel to the center plane of roughness at the position of 70 is as follows. It was measured. (1) A reference straight line drawn parallel to the center line of roughness 1 μm below the third highest peak of the two-dimensional surface roughness curve with a measurement length of 0.5 mm, and a roughness curve above the reference straight line The total area of the patterns formed by and (area A) The surface roughness of the support was measured by using Taristep manufactured by Rank Taylor Hobson, and the roughness curve was obtained. The surface roughness is measured using a pyramidal stylus of 0.1 × 2.5 μm, vertical magnification of 10,000 times, measuring length of 0.5 mm, measuring speed of 0.0025 mm /
s, the sampling frequency was 10 ms, and the filter cutoff was set to 8 Hz to remove higher frequency components than 8 Hz.

From the above-mentioned roughness curve, the third highest protrusion is carried, a reference line A is drawn 1 μm below the protrusion apex parallel to the center line of the roughness, and the reference line A and the reference line A and above. The total area of the figure formed by the roughness curve and the figure was calculated. Actually, it can be obtained by digitally capturing from the tally step and performing calculation using the obtained data. (2) A reference straight line drawn parallel to the roughness center line 3 μm below the third highest peak of the two-dimensional surface roughness curve with a measurement length of 0.5 mm, and a roughness curve below the reference straight line The total area of the figures formed by and (area B) Obtain the roughness curve in the same manner as in (1) above, select the third highest protrusion from the roughness curve, and select 3 μm from the protrusion vertex.
A reference line B was drawn below in parallel with the center line of roughness, and the total area of the figures formed by the reference line B and the roughness curve below the reference line B was obtained. Actually, it can be obtained by digitally capturing from the tally step and performing calculation using the obtained data. (3) Surface Roughness (Ra and Rz) The surface roughness of the support was measured using a Taristep manufactured by Rank Taylor Hobson Co., and a roughness curve was obtained. The surface roughness is measured using a pyramidal stylus of 0.1 × 2.5 μm, vertical magnification of 10,000 times, measuring length of 0.5 mm, measuring speed of 0.0025 mm /
s, the sampling frequency was 10 ms, and the filter cutoff was set to 8 Hz to remove higher frequency components than 8 Hz.
Ra and Rz are obtained from the obtained roughness curve based on JIS standard. (4) Opening diameter of aluminum plate surface and number of pits Determined by SEM photograph. The opening diameter is represented by the average opening diameter of the minor axis and the major axis of the pit observed in the SEM photograph. (5) Height difference between the highest point and the lowest point of the rough surface of the aluminum plate (Rt) WYKO non-contact three-dimensional micro surface measuring device (RST
PLUS). The measurement was performed in the "vertical scan method" mode under the conditions of an objective lens: 40 times, a magnification selector: 0.5 times, and a spatial sampling interval: 0.42 × 0.48 μm.

The measurement is first carried out in a range of about 115 × 150 μm, and if there is discontinuous data, it is restored (continuousized) by the software attached to the device, and then the range is selected to 10
Processed to 0 × 100 μm data (data points: 238 × 20
9). In addition, the highest point and the lowest point of the rough surface can be calculated by WYKO RS
Calculated by the software attached to T, and calculate the difference (Rt) between the highest point and the lowest point. (6) When the difference (Rt) in height between the highest point and the lowest point of the rough surface of the aluminum plate is 100, 70 from the lowest point side
Area (area C) and the number of islands formed in the cross section when the roughened surface of the aluminum plate is cut along a plane parallel to the center plane of roughness at the position WYKO non-contact Three-dimensional micro surface measuring device (RST
PLUS). The measurement was performed in the "vertical scan method" mode under the conditions of an objective lens: 40 times, a magnification selector: 0.5 times, and a spatial sampling interval: 0.42 × 0.48 μm.

The measurement is first carried out in a range of about 115 × 150 μm, and if there is discontinuous data, it is restored (continuousized) by the software attached to the device, and then the range is selected to 10
Processed to 0 × 100 μm data (data points: 238 × 20
9). In addition, the highest point and the lowest point of the rough surface can be calculated by WYKO RS
Calculated by the software attached to T.

The difference in height between the highest point and the lowest point of the roughness surface is
The area of the cross section when the surface roughened by the plane parallel to the center plane of the roughness at the position of 70 from the lowest point is cut when 100 is determined by the software attached to WYKO RST,
Also, count how many areas the cross section is divided into. However, the area where the area is less than 10 μm ² (50 data points or less) is ignored. (7) When the difference (Rt) in height between the highest point and the lowest point of the rough surface of the aluminum plate is 100, 50 from the lowest point side.
Area of sea part (area D) and number of sea parts formed in the cross section when the roughened surface of the aluminum plate is cut by a plane parallel to the center plane of roughness at the position WYKO non-contact three-dimensional Micro surface measuring device (RST
PLUS). The measurement was performed in the "vertical scan method" mode under the conditions of an objective lens: 40 times, a magnification selector: 0.5 times, and a spatial sampling interval: 0.42 × 0.48 μm.

The measurement is first carried out in the range of about 115 × 150 μm, and if there is discontinuous data, it is restored (continuousized) by the software attached to the device, and then the range is selected to 10
Processed to 0 × 100 μm data (data points: 238 × 20
9). In addition, the highest point and the lowest point of the rough surface can be calculated by WYKO RS
Calculated by the software attached to T.

The difference in height between the highest point and the lowest point of the roughness surface is
The area of the recessed part (sea part) of the cross section when the surface roughened by the plane parallel to the center plane of the roughness at the position of 50 from the lowest point is cut when 100 is determined by the software attached to WYKO RST, We also counted how many areas the cross section was divided into. However, the region with an area less than 10 μm ² (50 data points or less) was ignored. (8) When the difference (Rt) in height between the highest point and the lowest point of the rough surface of the aluminum plate is 100, it is 50 from the lowest point side.
The projected area of the rough surface portion of the aluminum plate surface in the range surrounded by the plane parallel to the center plane of the roughness at the position of 70 and the plane parallel to the center plane of the roughness at the position of 70 WYKO non-contact three-dimensional Micro surface measuring device (RST
PLUS). The measurement was performed in the "vertical scan method" mode under the conditions of an objective lens: 40 times, a magnification selector: 0.5 times, and a spatial sampling interval: 0.42 × 0.48 μm.

The measurement is first performed within a range of about 115 × 150 μm, and if there is discontinuous data, it is repaired (continuous) by the software attached to the device, and then the range is selected to 10
Processed to 0 × 100 μm data (data points: 238 × 20
9). In addition, the highest point and the lowest point of the rough surface can be calculated by WYKO RS
It was determined by the software attached to T.

When the difference in height between the highest point and the lowest point of the obtained roughness curved surface is 100, the plane parallel to the center plane of the roughness at the position 50 from the lowest point side and the roughness at the position 70 The projected area of the rough surface portion of the aluminum plate surface in the range surrounded by the center plane and the plane parallel to was determined by the software attached to WYKO RST.

The photosensitive lithographic printing plate of the present invention can be made into a plate by exposing and developing it in a usual manner. For example, a transparent original image having a line image, a halftone image or the like is brought into close contact with a photosensitive surface and exposed, and then the photosensitive layer is removed using an appropriate developing solution to obtain a relief image.

Suitable light sources for exposure include mercury lamps, metal halide lamps, xenon lamps, chemical lamps,
And carbon arc lamps. Further, as the developer used for development, for example, sodium silicate, alkali metal silicate such as potassium silicate, sodium hydroxide,
An alkaline aqueous solution such as an aqueous solution of potassium hydroxide, tribasic sodium phosphate, dibasic sodium phosphate, sodium carbonate, potassium carbonate and the like can be used. The concentration of the aqueous alkali solution at this time varies depending on the type of the photosensitive composition and the alkali, but is generally in the range of 0.1 to 10% by weight. Further, an organic solvent such as a surfactant or alcohol can be added to the aqueous alkali solution as needed.

[0138]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples.

Example 1 0.3 mm thick aluminum plate (material 1050, temper H16)
Was immersed in a 10% sodium hydroxide aqueous solution kept at 85 ° C., degreased for 10 seconds, and then washed with water. The degreased aluminum plate was immersed in a 10% sulfuric acid aqueous solution kept at 25 ° C. for a minute, neutralized, and washed with water.

Then, the obtained aluminum plate is shown in Table 1.
As described above, brush polishing was performed under the brush polishing conditions shown in Table 1, or electrolytic surface roughening was performed without brush polishing under the electrolytic conditions shown in Table 1 using an alternating current of 60 Hz.

When brush-polishing was performed, after brush-polishing, it was immersed in a 10% sodium hydroxide aqueous solution kept at 70 ° C. for 10 seconds, and then immersed in a 10% sulfuric acid aqueous solution kept at 25 ° C. It was immersed for 10 seconds and washed with water. After the electrolytic surface roughening, it was immersed in a 1% sodium hydroxide aqueous solution kept at 50 ° C. for 30 seconds, then immersed in a 10% sulfuric acid aqueous solution kept at 25 ° C. for 10 seconds, and then washed with water.

Then, in a 20% sulfuric acid aqueous solution, at a temperature of 35 ° C.,
Anodizing treatment was performed for 1 minute under the condition of current density of 2 A / dm ² , then it was immersed in 0.1% ammonium acetate aqueous solution kept at 80 ° C for 30 seconds for sealing treatment, and dried at 80 ° C for 5 minutes. To obtain supports 1 to 14.

[0143]

[Table 1] In Table 1, the brush polishing conditions are as follows.
(The same applies to the following examples.)

Brush Polishing Condition A Volatile ash (# 300) was used as a polishing agent suspension prepared by suspending it in water at a concentration of 20% by weight, and roughening was performed by pressing a rotating nylon brush against a support. . For roughening, the brush indentation is 20 mm against the support and the line speed is 5
It was carried out by passing once at m / min. The rotation direction of the brush was opposite to the running direction of the support, and the rotation speed was 400 rotations per minute.

Brush Polishing Condition B The process under the brush polishing condition A was performed twice.

Brush Polishing Condition C The treatment under the brush polishing condition A was performed three times.

The surface roughness of the surface of each of the obtained supports 1 to 14 was measured by the following method, and "area A" (measurement length 0.5 mm
1 from the top of the third highest mountain of the two-dimensional surface roughness curve of
Area surrounded by a reference straight line drawn parallel to the center line of roughness under μm and a roughness curve above the reference straight line and "Area B" (two-dimensional surface roughness curve with a measurement length of 0.5 mm) Of 3
An area surrounded by a reference straight line drawn parallel to the center line of the roughness 3 μm below the apex of the second highest mountain and an area surrounded by the roughness curve below the reference straight line) was obtained by the following. Table 2 shows the obtained results.

<Surface Roughness> The surface roughness of the support was measured by using Taristep manufactured by Rank Taylor Hobson Co., and the roughness curve was obtained. The surface roughness is measured using a pyramidal stylus of 0.1 × 2.5 μm, longitudinal magnification of 10,000 times, measurement length of 0.5.
mm, measurement speed 0.0025 mm / s, sampling frequency 10 ms, and filter cutoff was set to 8 Hz to remove high frequency components higher than 8 Hz.

<Area A> From the roughness curve obtained by the surface roughness measurement, the third highest protrusion is carried, and it is 1 from the protrusion apex.
A reference line A was drawn under μm in parallel with the center line of roughness, and the total area of the figure formed by the reference line A and the roughness curve above the reference line A was obtained. Actually, it can be obtained by digitally capturing from the tally step and performing calculation using the obtained data.

<Area B> From the roughness curve obtained by the surface roughness measurement, the protrusion having the third highest height is selected, and the protrusion is 3 from the protrusion vertex.
A reference line B was drawn under μm in parallel with the center line of the roughness, and the total area of figures formed by the reference line B and the roughness curve below the reference line B was obtained. Actually, it can be obtained by digitally capturing from the tally step and performing calculation using the obtained data.

Then, a photosensitive composition coating solution having the following composition was applied to the supports 1 to 14 using a wire bar and dried at 80 ° C. to obtain photosensitive lithographic printing plate samples 1 to 14. At this time, the photosensitive composition coating liquid was applied so as to have a dry weight of 2.0 g / m ² .

<< Photosensitive Composition Composition >> Novolac resin (phenol / m-cresol / p-cresol molar ratio 10/54/36, weight average molecular weight 4000) 6.7 g pyrogallolacetone resin (weight average molecular weight 3000) and o -Naphthoquinonediazide-5-sulfonyl chloride condensate (esterification rate 30%) 1.5 g Polyethylene glycol # 2000 0.2 g 2,4-bis (trichloromethyl) -6- (p-methoxystyryl) -s-triazine 0.2 g Victoria Pure Blue BOH (manufactured by Hodogaya Chemical Co., Ltd.) 0.08 g FC-430 (manufactured by Sumitomo 3M Co., Ltd.) 0.03 g cis-1,2-cyclohexanedicarboxylic acid 0.2 g Methyl cellosolve 100 ml

Each of the obtained photosensitive lithographic printing plates was
The original film was brought into close contact, and a 4 kw metal halide lamp was used as a light source, and irradiation was performed for 60 seconds at an illuminance of 8 mW / cm ² for exposure. This exposed photosensitive lithographic printing plate was used as a commercially available developing solution [SDR-1, Konica Corporation
Made, diluted 6 times, developed for 20 seconds, developed at 27 ° C.] and evaluated for printing durability and fine dot-like stains as follows. Table 2 shows the obtained results.

<< Evaluation of Printing Durability >> Using the obtained lithographic printing plate, a printing machine (manufactured by Mitsubishi Heavy Industries, Ltd., DAIYAlF-
1) Printing is carried out using dipped coated paper, dampening water (Tokyo Ink Co., Ltd. etch solution SG-51 concentration 1.5%), ink (Toyo Ink Mfg. Co., Ltd. High Plus M red),
Printing was continued until ink inking defects appeared in the image area of the printed matter or ink adhered to the non-image area, and the number of printed sheets at that time was counted.

<Evaluation of fine dot-like stain> Under the same printing conditions as in the evaluation of printing durability, the printing machine was stopped once at the time of printing 5000 sheets, left for 1 hour, and then printing was started. The number of fine dot-like stains was counted and evaluated by the number generated per 100 cm ² .

[0156]

[0157]

[Table 2]

Example 2 Supports 15-52 were prepared in the same manner as Supports 1-14 of Example 1 except that the brush polishing conditions and electrolytic surface roughening conditions were changed as shown in Tables 3-5. Obtained. Obtained support 1
The surface roughness Ra and Rz of 5 to 52 were determined by the following method. Tables 3 to 5 show the obtained results.

<Surface Roughness Ra and Rz> The surface roughness of the support was measured using a Taristep manufactured by Rank Taylor Hobson Co., and a roughness curve was obtained. Surface roughness is 0.1
X2.5μm pyramid-shaped stylus is used, vertical magnification is 10000
Double, measurement length 0.5 mm, measurement speed 0.0025 mm / s, sampling frequency 10 ms, and a filter cutoff of 8 Hz to remove high frequency components higher than 8 Hz. Ra and Rz were determined from the obtained roughness curve based on JIS standards.

Next, the photosensitive composition coating liquid described in Example 1 was applied to the supports 15 to 52 using a wire bar,
It was dried at the drying temperature shown in Tables 3 to 5 to obtain photosensitive lithographic printing plate samples 15 to 52. At this time, the photosensitive composition coating liquid was applied so as to have a dry weight of 2.0 g / m ² .

Further, in some of the samples shown in Tables 3 to 5, the photosensitive layer was smoothed. The smoothing treatment was carried out by sandwiching the photosensitive lithographic printing plate between two glass plates and
The sample was placed horizontally in a constant temperature bath maintained at the smoothing treatment temperature shown in Table 5 and uniformly loaded with a load of 500 g per 100 cm ² of the photosensitive lithographic printing plate, and the smoothing treatment time shown in Table 3 to Table 5 was applied. This was done by holding.

Then, the surface roughness Ra and Rz of the photosensitive layers of the photosensitive lithographic printing plate samples 15 to 52 subjected to the smoothing treatment were carried out.
Was determined by the same method as the surface roughness of the above support. Tables 3 to 5 show the obtained results.

[0163]

[Table 3]

[0164]

[Table 4]

[0165]

[Table 5] Printing was carried out in the same manner as in Example 1 using the developed photosensitive lithographic printing plate samples 15 to 52, and easiness of stain when the dampening water was reduced and water loss when the dampening water was increased. And the small dot reproducibility were evaluated by the following. The obtained results are shown in Tables 6 to 7.

<< Evaluation of Ease of Staining When Reducing Dampening Water and Ease of Water Loss When Increasing Dampening Water >> During printing, the ink amount dial was kept constant, and the water amount dial was changed. When the amount of dampening water is changed and the amount of dampening water is reduced, the dial value at which non-image areas start to become dirty (the larger the value is, the more easily it becomes dirty) and the amount of dampening water that is lost I checked the dial value that started to occur (the smaller the value, the easier it was to lose water).

<Evaluation of Small Point Reproducibility> On the exposed and developed printing plate, the shape of 20% halftone dots with a screen ruling of 300 line / inch was observed using a differential interference microscope, and the small point reproducibility was as follows. It was evaluated on a scale of 5 according to the evaluation criteria. <Evaluation criteria> 5: Dot size is almost constant and shape is close to circle 4; Dot size is almost constant and shape deviates from circle (major axis / minor axis ≧ 1.5) Less than 30% 3; Dot Shape deviates from a circle (major axis / minor axis ≥ 1.
5) 30% or more and 80% or less 2; Dot shape deviates from circle (major axis / minor axis ≥ 1.
5) More than 80% 1; some dots are not formed

[0168]

[Table 6]

[0169]

[Table 7]

Example 3 Supports 53 to 65 were obtained in the same manner as the supports 1 to 14 of Example 1 except that the brush polishing conditions and the electrolytic surface roughening conditions were changed as shown in Table 8. Obtained Supports 53-6
The distribution of the pit diameter on the surface of No. 5 was determined by the following method. Table 8 shows the obtained results.

<Pit Diameter Distribution> Opening diameter is 0.1 μm to 0.5
μm, 0.5 μm to 1.0 μm, 1.0 μm to 1.5 μm, 1.5 μm to 2.0 μ
The number of pits in 4 ranges of m, the opening diameter 0.5 ~ 2.0μm
Pits are obtained by using a SEM photograph of 5000 times, and pits of 0.1 to 0.5 μm are obtained by using a SEM photograph of 10,000 times.
It was converted to the number in the range of m × 100 μm.

[0172]

[Table 8]

Next, the support 53 to 65 is coated with the photosensitive composition coating solution described in Example 1 using a wire bar,
It was dried at 80 ° C. to obtain photosensitive lithographic printing plate samples 53 to 65. At this time, the photosensitive composition coating liquid has a dry weight of 2.
It was applied so as to be 0 g / m ² .

Then, photosensitive planographic printing plate samples 53 to 65 were prepared.
Was exposed and developed under the same conditions as in Example 1, and printing was performed in the same manner as in Example 1 using the developed photosensitive lithographic printing plate samples 53 to 65, and the dot gain and K value were determined by the following. . Table 9 shows the obtained results.

<< Dot gain >> Printing was performed with the density of the image area set to 1.6, and the screen line number of 150 l was printed on the printed matter.
The area of 50% halftone dot of ine / inch was measured and the gain amount was calculated. The area was measured with a Macbeth densitometer.

<< K value >> Printing was performed with the density of the image part being 1.6, and the screen line number was 150 line / inc on the printed matter.
The concentration of 80% of the points of h was measured, and the K value was calculated using the following formula. The density was measured with a Macbeth densitometer. K value = (density of image part-80% density of image point) / density of image part The larger the K value, the better the reproducibility of the high density halftone dot part.

[0177]

[Table 9]

Example 4 Supports 66 to 73 were obtained in the same manner as Supports 1 to 14 of Example 1 except that the brush polishing conditions and the electrolytic surface roughening conditions were changed as shown in Table 10. Therefore, Rt (difference between the highest point and the lowest point on the rough surface), area C (the height difference between the highest point and the lowest point on the rough surface is 100, and the center plane of the roughness at the position 70 from the lowest point side) The area of the cross section when the roughened surface of the aluminum plate is cut by a plane parallel to the surface area and the number of areas of area C (the difference in height between the highest point and the lowest point of the rough surface is 10).
When 0 was set, the number of islands formed in the cross section when the roughened surface of the aluminum plate was cut in a plane parallel to the center plane of the roughness at a position 70 from the lowest point side) was obtained. .

<Rt> The three-dimensional surface roughness of the surfaces of the obtained supports 66 to 73 was measured using a non-contact three-dimensional fine surface measuring device (RST PLUS) manufactured by WYKO. Measurement is in "vertical scan method" mode, objective lens:
40 times, magnification selector: 0.5 times, spatial sampling interval: 0.42 × 0.48 μm.

The measurement is first carried out in a range of about 115 × 150 μm, and if there is discontinuous data, it is repaired (continuous) by the software attached to the device, and then the range is selected to 10
Processed to 0 × 100 μm data (data points: 238 × 20
9). In addition, the highest point and the lowest point of the rough surface can be calculated by WYKO RS
It was determined by the software attached to T. The difference (Rt) between the highest point and the lowest point was calculated.

<Area C and Number of Areas of Area C> When the difference in height between the highest point and the lowest point of the roughness curved surface is 100, the roughness is a plane parallel to the center plane of the roughness at the position 70 from the lowest point. The area of the cross section when the planarized surface was cut was obtained by the software attached to WYKO RST, and the number of regions into which the cross section was divided was counted. However, the area is 10
The area less than μm ² (50 data points or less) was ignored. Table 10 shows the obtained results.

[0182]

[Table 10]

In Table 10, the brush polishing conditions are as follows. (The same applies to the following examples.)

Brush Polishing Condition D Roughening was performed in the same manner as in Brush Polishing Condition A, except that the abrasive was changed from volcanic ash (# 300) to volcanic ash (# 400).

Brush Polishing Condition E The process under the brush polishing condition D was performed twice.

Brush Polishing Condition F The process under the brush polishing condition D was performed three times.

Next, the photosensitive composition coating solution described in Example 1 was applied to the supports 53 to 65 using a wire bar,
It was dried at 80 ° C. to obtain photosensitive lithographic printing plate samples 53 to 65. At this time, the photosensitive composition coating liquid has a dry weight of 2.
It was applied so as to be 0 g / m ² .

Then, photosensitive planographic printing plate samples 53 to 65 were prepared.
Was exposed and developed under the same conditions as in Example 1, and printing was carried out in the same manner as in Example 1 using the developed photosensitive lithographic printing plate samples 53 to 65 to obtain printing durability, blanket stains and fountain solution. The easiness of soiling when the amount of water was reduced and the ease of losing water when the amount of dampening water was increased were evaluated. Table 11 shows the obtained results.

<< Evaluation of Printing Durability >> Same as in Example 1

<< Evaluation of Staining Ease with Less Dampening Water and Ease of Water Loss with More Damping Water >> Same as in Example 2

<< Evaluation of Blanket Stain >> At the time of printing 2000 sheets, stains on the blanket at a portion contacting the non-image area of the printing plate were collected by sticking a transparent adhesive tape on the blanket and peeling it off, and this was collected in white. After sticking to the paper, the degree of stain was measured with a Macbeth densitometer.
The evaluation was carried out by a relative value when the stain density when the support 66 was used was 100. As the ink, Toyo Ink High Plus M ink was used.

[0192]

[Table 11]

Example 5 Supports 74 to 84 were obtained in the same manner as Supports 1 to 14 of Example 1 except that the brush polishing conditions and the electrolytic surface roughening conditions were changed as shown in Table 12. Therefore, Rt (difference between the highest point and the lowest point of the rough surface), area D (when the difference between the height of the highest point and the lowest point of the rough surface is 100, the center plane of roughness at the position of 50 from the lowest point side The area of the sea part formed in the cross section when the roughened surface of the aluminum plate is cut by a plane parallel to and the number of regions of area D (the difference in height between the highest point and the lowest point of the rough surface is 100). Then, the number of sea parts formed in the cross section when the roughened surface of the aluminum plate was cut at a plane parallel to the center plane of the roughness at the position 50 from the lowest point side was calculated.

<Rt> Same as Example 4

<Area D and Number of Areas of Area D> The three-dimensional surface roughness of the obtained supports 74 to 84 was measured using a non-contact three-dimensional micro surface measuring device (RST PLUS) manufactured by WYKO. . Measurement is in "vertical scan method" mode, objective lens: 40x, magnification selector: 0.5x,
Spatial sampling interval: 0.42 × 0.48 μm.

The measurement is first carried out in the range of about 115 × 150 μm, and if there is discontinuous data, it is repaired (made continuous) by the software attached to the device, and then the range is selected to 10
Processed to 0 × 100 μm data (data points: 238 × 20
9). In addition, the highest point and the lowest point of the rough surface can be calculated by WYKO RS
It was determined by the software attached to T.

When the difference between the heights of the highest point and the lowest point of the obtained roughness curved surface is 100, the roughened surface is cut by a plane parallel to the center plane of the roughness at the position of 50 from the lowest point. The area of the cross-section at that time was obtained by the software attached to WYKO RST, and the number of regions into which the cross-section was divided was counted. However, the region with an area less than 10 μm ² (50 data points or less) was ignored. Table 12 shows the obtained results.

[0198]

[Table 12]

Next, the photosensitive composition coating liquid described in Example 1 was applied to the supports 74 to 84 using a wire bar,
It was dried at 80 ° C. to obtain photosensitive lithographic printing plate samples 74 to 84. At this time, the photosensitive composition coating liquid has a dry weight of 2.
It was applied so as to be 0 g / m ² .

Then, photosensitive planographic printing plate samples 74 to 84 were prepared.
Was exposed and developed under the same conditions as in Example 1, and the developability was evaluated as follows. Further, printing was performed in the same manner as in Example 1 using the developed photosensitive lithographic printing plate samples 74 to 84 to remove fine dot-like stains, the ease of stain when the dampening water was reduced, and the dampening water. The easiness of losing water when the amount was increased was evaluated by the following. The obtained results are shown in Table 13.

<Evaluation of developability> A sample obtained by developing an exposed photosensitive lithographic printing plate with a developer [SDR-1, manufactured by Konica Corporation, diluted 8 times, development time 20 seconds, development temperature 27 ° C.] When,
A sample developed with a developer [SDR-1, manufactured by Konica Corporation, diluted 6 times, development time 20 seconds, development temperature 27 ° C.] was compared,
The developability was evaluated by whether there is a difference in the number of clear stages. A sample having excellent developability was marked with ◯, and a sample having poor developability was marked with x.

<< Evaluation of fine dot-like stain >> Same as in Example 1

<< Evaluation of Staining Ease with Less Dampening Water and Ease of Water Loss with Increasing Damping Water >> Same as Example 2

[0204]

[Table 13]

Example 6 Supports 85 to 93 were obtained in the same manner as Supports 1 to 14 of Example 1 except that the brush polishing conditions and the electrolytic surface roughening conditions were changed as shown in Table 14. Therefore, Rt (difference between the highest point and the lowest point on the rough surface) and the area of height 50 to 70 (when the difference between the height of the highest point and the lowest point on the rough surface is 100, the position of 50 from the lowest point side) And a plane parallel to the center plane of the roughness at 70
The projected area of the rough surface portion of the aluminum plate surface in the range surrounded by the center plane of the roughness and the plane parallel to the position was calculated.

<Rt> Same as Example 4

<Area of height 50 to 70> Obtained support 85
The three-dimensional surface roughness of the ~ 93 surface was measured using a non-contact three-dimensional micro surface measuring device (RST PLUS) manufactured by WYKO. The measurement is in the "vertical scan method" mode,
The objective lens was 40 times, the magnification selector was 0.5 times, and the spatial sampling interval was 0.42 × 0.48 μm.

The measurement is first carried out in the range of about 115 × 150 μm, and if there is discontinuous data, it is repaired (continuous) by the software attached to the device and then the range is selected to 10
Processed to 0 × 100 μm data (data points: 238 × 20
9). In addition, the highest point and the lowest point of the rough surface can be calculated by WYKO RS
It was determined by the software attached to T.

When the difference between the heights of the highest point and the lowest point of the obtained roughness curved surface is 100, a plane parallel to the center plane of the roughness at the position 50 from the lowest point side and the roughness at the position 70 The projected area of the rough surface portion of the aluminum plate surface in the range surrounded by the center plane and the plane parallel to was determined by the software attached to WYKO RST. The results obtained are shown in Table 14.
Shown in

[0210]

[Table 14]

Next, the photosensitive composition coating liquid described in Example 1 was applied to the supports 85 to 93 using a wire bar,
It was dried at 80 ° C. to obtain photosensitive planographic printing plate samples 85 to 93. At this time, the photosensitive composition coating liquid has a dry weight of 2.
It was applied so as to be 0 g / m ² .

Then, photosensitive planographic printing plate samples 85 to 93 were prepared.
Was exposed and developed under the same conditions as in Example 1, and the developability was evaluated as follows. Further, printing was performed in the same manner as in Example 1 using the developed photosensitive lithographic printing plate samples 85 to 93, and small point reproducibility, ease of staining when reducing fountain solution and increase in fountain solution were increased. The easiness of losing water was evaluated by the following. The results obtained are shown in Table 15.

<< Evaluation of Small Point Reproducibility >> Same as in Example 2

<< Evaluation of Staining Ease with Less Dampening Water and Ease of Water Loss with More Damping Water >> Same as Example 2

[0215]

[Table 15]

[0216]

EFFECT OF THE INVENTION The photosensitive lithographic printing plate of the present invention has excellent printing durability, is less likely to be smeared on non-image areas, and is particularly unlikely to cause fine dot-like stains after printing is stopped. The photosensitive lithographic printing plate has improved dot reproducibility while maintaining the water retention property of the support, and the photosensitive lithographic printing plate of the present invention has excellent dot gain and K value.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C25D 11/16 301 C25D 11/16 301 G03F 7/00 503 G03F 7/00 503 (72) Inventor Yasuhisa Sugi No. 1 Sakura-cho, Hino City, Tokyo Konica Stock Company

Claims (12)

[Claims] 1. A photosensitive lithographic printing plate comprising a support and a layer of a photosensitive composition provided thereon, wherein the support has a measurement length of 0.5 mm.
1 from the top of the third highest mountain of the two-dimensional surface roughness curve of
A rough surface having a surface having a total area of 50 μm ² or more and 150 μm ² or less formed by a reference straight line drawn parallel to the center line of roughness below μm and a roughness curve above the reference straight line A photosensitive lithographic printing plate, which is an aluminum plate that has been subjected to chemical treatment and anodization treatment. 2. In a photosensitive lithographic printing plate comprising a support and a layer of the photosensitive composition provided thereon, the support has a measurement length of 0.5 mm.
3 from the top of the third highest mountain of the two-dimensional surface roughness curve of
A rough surface having a surface having a total area of 50 μm ² or more and 250 μm ² or less formed by a reference straight line drawn parallel to the center line of roughness under μm and a roughness curve below the reference straight line A photosensitive lithographic printing plate, which is an aluminum plate that has been subjected to chemical treatment and anodization treatment. 3. A photosensitive lithographic printing plate comprising a support and a layer of the photosensitive composition provided thereon, wherein the support has a measurement length of 0.5 mm.
1 from the top of the third highest mountain of the two-dimensional surface roughness curve of
The total area of the figure formed by a reference straight line drawn parallel to the center line of roughness below μm and the roughness curve above the reference straight line is 50 μm ² or more and 150 μm ² or less, and the third If the total area of the figure formed by the reference straight line drawn parallel to the center line of roughness 3 μm below the peak of the highest mountain and the roughness curve below the reference straight line is 50 μm ² or more and 250 μm ² or less A photosensitive lithographic printing plate, which is an aluminum plate having a surface and having been subjected to a roughening treatment and an anodizing treatment. 4. A photosensitive lithographic printing plate comprising a support and a layer of a photosensitive composition on the support, wherein the support is an aluminum plate that has been subjected to a surface roughening treatment and an anodization treatment, and The surface morphology of the planarized aluminum plate is 100 μm
Within the range of × 100μm, the height difference between the highest point and the lowest point of the rough surface is 6.0μm or more and 10.0μm or less, and the lowest point when the height difference between the highest point and the lowest point is 100. The area of the island portion formed in the cross section when the roughened surface of the aluminum plate is cut by a plane parallel to the center plane of the roughness at the position 70 from the side is 1000 μm ² or more and 2000 μm ² or less A photosensitive lithographic printing plate characterized by: 5. The roughened surface of the aluminum plate is cut along a plane parallel to the center plane of the roughness at a position 70 from the lowest point side when the height difference between the highest point and the lowest point is 100. The number of islands formed on the cross section is 100 μm × 10
The photosensitive lithographic printing plate according to claim 4, which is 10 or more and 50 or less within a range of 0 µm. 6. A photosensitive lithographic printing plate comprising a support and a layer of a photosensitive composition on the support, wherein the support is an aluminum plate which has been subjected to a surface roughening treatment and an anodizing treatment, and The surface morphology of the planarized aluminum plate is 100 μm
Within the range of × 100μm, the height difference between the highest point and the lowest point of the rough surface is 6.0μm or more and 10.0μm or less, and the lowest point when the height difference between the highest point and the lowest point is 100. that area of the sea, which is formed on the cross-section of a cutaway of the roughened surface of the aluminum plate in the center plane parallel to the plane of the roughness at the position of 50 from the side is at 1500 .mu.m ² or more 3000 .mu.m ² or less Characteristic photosensitive lithographic printing plate. 7. A roughened surface of an aluminum plate is cut by a plane parallel to the center plane of roughness at a position 50 from the lowest point side when the height difference between the highest point and the lowest point is 100. The number of sea areas formed in the cross section when
7. The photosensitive lithographic printing plate according to claim 6, which is 10 or more and 50 or less within a range of 100 μm. 8. A photosensitive lithographic printing plate comprising a support and a layer of a photosensitive composition provided thereon, wherein the support has a surface roughness of R.
It is an aluminum plate having a surface of 0.6 μm or more and 0.9 μm or less in a and Rz of 3.5 μm or more and 6.0 μm or less, which has been subjected to a roughening treatment and anodization treatment, and a layer of a photosensitive composition on the aluminum plate. And a step of smoothing the surface of the photosensitive composition layer are then provided, which is a method for producing a photosensitive lithographic printing plate. 9. A photosensitive lithographic printing plate comprising a support and a layer of a photosensitive composition on the support, wherein the support has a surface roughness R.
a is an aluminum plate having a surface of 0.6 μm or more and 0.9 μm or less and Rz of 3.5 μm or more and 6.0 μm or less, and has a surface roughness of a layer of a photosensitive composition. Ra is 0.1 μm or more and 0.35 μm or less, and Rz is 0.7
A photosensitive lithographic printing plate characterized by having a size of not less than μm and not more than 2.2 μm. 10. The surface roughness of the layer of the photosensitive composition is Ra.
10. The photosensitive lithographic printing plate according to claim 9, wherein the Rz is 0.7 μm or more and 0.2 μm or less and Rz is 0.7 μm or more and 1.1 μm or less. 11. A photosensitive lithographic printing plate comprising a support and a layer of a photosensitive composition on the support, wherein the support is an aluminum plate that has been subjected to a surface-roughening treatment and an anodizing treatment, and The surface morphology of the planarized aluminum plate is 100 μm
Within the range of × 100μm, the difference between the height of the highest point and the lowest point of the rough surface is 6.0μm or more and 10.0μm or less, and the difference between the heights of the highest point and the lowest point is 100. The projected area of the rough surface portion of the aluminum plate surface in the range surrounded by the plane parallel to the roughness center plane at the position 50 from the point side and the plane parallel to the center plane of the roughness at position 70
A photosensitive lithographic printing plate characterized by having a size of 6000 μm ² or more. 12. A photosensitive lithographic printing plate comprising a support and a layer of a photosensitive composition on the support, wherein the support is an aluminum plate which has been subjected to a surface-roughening treatment and an anodization treatment, and The number of pits on the surface of the aluminum plate formed by electrochemical graining with a diameter within the range of 0.5 μm or more and 2.0 μm or less is the number of pits within the range of the opening diameter of 0.1 μm or more and 2.0 μm or less. A photosensitive lithographic printing plate characterized by being 80% or more.