JP2003162047A - Layered body of lithographic printing original plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a layered body of a lithographic printing original plate surely preventing peeling of films and having high release property. <P>SOLUTION: The layered body of lithographic printing original plate is formed by stacking a positive lithographic printing original plate for IR laser light and an inserting paper. The lithographic printing original plate comprises a positive recording layer which increases the solubility with an alkaline aqueous solution by the effect of light or heat and an overcoat layer containing a water- soluble polymer compound and a photothermal converting agent successively deposited on a supporting body. The surface of the inserting paper to come into contact with the surface of the overcoat layer shows the Beck hardness of ≥3 seconds and ≤900 seconds. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a planographic printing plate precursor.
More specifically, the lithographic printing plate precursor and the lithographic plate
In contact with the coating film (overcoat layer) of the printing plate precursor,
A planographic printing plate precursor using a slip sheet to protect the coating film
Regarding the layered body. [0002] 2. Description of the Related Art Recent development of laser
In particular, a solid-state laser with a light emitting region from near infrared to infrared
Semiconductor lasers are easily available in high output and small size
It is like that. Digital data such as computers
These lasers are used as exposure light sources when directly making plates from
Is very useful. The positive lithographic printing plate material for infrared laser is
Binder resin that is soluble in alkaline aqueous solution and absorbs light
An IR dye that generates heat, an essential component, and an IR dye
However, in the unexposed area (image area),
The solubility of the binder resin is substantially reduced by the action.
It acts as a dissolution inhibitor, and in exposed areas (non-image areas)
Interaction between IR dyes and binder resin due to generated heat
Use is weakened and dissolved in an alkaline developer to form a lithographic printing plate
To do. However, such infrared laser positive type
For lithographic printing plate materials, unexposed areas under various operating conditions
The dissolution resistance of the (image area) to the developer and the exposed area (non-image area)
The difference between the solubility of the image part) is still not enough and it is used
It is easy to cause over-development or development failure due to changes in conditions.
There was a problem. Also, touch the surface during handling.
However, the surface condition is likely to fluctuate, such as fine scratches.
However, such fine scratches and slight surface fluctuations occurred
In some cases, the solubility is improved and the unexposed area is
The (image area) dissolves and becomes a scratch mark, which deteriorates printing durability and wear.
There was a problem of causing poor meat. Such a problem is the positive type for infrared lasers.
Lithographic printing plate materials and positive type lithographic stamps made by UV exposure
This is due to the essential difference in the plate making mechanism with the plate material.
The In other words, positive lithographic printing that makes a plate by UV exposure
For plate materials, alkaline aqueous soluble binder resin
And onium salts and quinonediazide compounds as essential ingredients
Onium salts and quinonediazide compounds
Interacts with the binder resin in the unexposed area (image area)
Not only acts as a dissolution inhibitor, but also
In the image area), it is decomposed by light to generate acid and promote dissolution
It plays two roles of working as an agent. In contrast, a positive lithographic stamp for infrared lasers.
IR dyes etc. in the printing plate material are unexposed areas (image areas)
It only acts as a dissolution inhibitor and dissolves exposed areas (non-image areas).
It does not promote the solution. Therefore, infrared laser
In dilithographic lithographic printing plate materials, the dissolution of unexposed and exposed areas
In order to bring out the difference in solubility, as a binder resin,
Uses those that are highly soluble in alkaline developer.
Inevitably, it has the problem of being inferior in scratch resistance. As means for improving these points, Japanese Patent Application Laid-Open No. Hei 11 (1999)
10-250255 discloses a recording layer having a multilayer structure.
It has been proposed. However they are substantially soluble
Is used in the key process of image formation
Without ablating the upper layer,
It uses a function that changes permeability,
Cause various harmful effects caused by Also, the recording layer
To protect the recording layer on the surface of the recording layer
Often used to form an overcoat layer containing
It has been. However, an auto containing a water-soluble resin.
A lithographic printing plate precursor with a bar coat layer is
The water solubility of the overcoat layer is a major problem
It becomes. That is, a lithographic printing plate precursor usually has a plurality of lithographic stamps.
Plate masters are transported in layers, but contain water-soluble resin
The overcoat layer is sticky to the surface due to its water solubility
Lithographic printing plate precursors adhere to each other.
When it is peeled off, the overcoat layer
Problem that part or all of
It had a problem of this. To solve the problem
In addition, when transporting multiple planographic printing plate precursors,
An overcoat layer provided, and the overcoat layer
Laminated paper is formed by stacking with paper called protective paper.
A means to do is sometimes used. Also laminated
At least one side of the laminated planographic printing plate precursor in the stacking direction
And place a protective cardboard called a hitting ball
There is also. However, a lithographic plate having such a laminated structure
Even if it is a laminate of a printing plate precursor and slip sheets or hitting balls,
For example, during transportation, the planographic printing plate precursor and slip sheets or hitting balls
And the contact portion may rub against each other, and film peeling may occur. In addition, such a planographic printing plate precursor and interleaf
When using a laminated body with a contact ball on an automatic plate-making machine
To remove the interleaf paper or contact ball from the lithographic printing plate precursor
There is a need. Therefore, peeling of interleaf paper and provision of lithographic printing plate precursors
Automatic plate-making machine with automatic plate feeding function
When using a loose plate setter, etc.
Can be achieved. However, the interleaf paper and the contact ball are lithographic printing plates.
If it is in close contact with the original plate, the slip sheet or the hitting ball
It was supplied without being peeled from the plate precursor
Therefore, inconveniences such as stopping automatic plate feeding operation may occur.
is there. In particular, the overprint provided on the lithographic printing plate precursor
If the coat layer is water-soluble and sticky,
The peelability between the ball and the planographic printing plate precursor is low, which is inconvenient
Often occurs. For example, the image forming surface of a planographic printing plate (over
-The slip sheet is in contact with the surface on which the coat layer is formed
If you pick up the interleaving paper with a suction cup and lift it up,
It is lifted and supplied with the original plate
May end up. Also, non-image form of lithographic printing plate precursor
Adsorb surface (surface without overcoat layer)
Even if it is lifted
The lithographic printing plate precursor may be supplied as it is
The [0012] The object of the present invention is to provide scratch resistance.
Ensures exfoliation of lithographic printing plate precursors with excellent properties and recording sensitivity
Planographic printing plate precursor lamination that prevents and has good releasability
To provide a body. [0013] [Means for Solving the Problems] The present inventors have studied.
As a result, by using a slip sheet with specific surface characteristics,
Effective overcoat layer of lithographic printing plate precursor with high scratch resistance
It can be protected effectively, and it can prevent film peeling and
And found that a laminate with good peelability can be formed.
The present invention has been completed. The lithographic printing plate precursor laminate of the present invention is a support.
In addition, it can be dissolved in an aqueous alkali solution by the action of light or heat.
A positive recording layer with increased solubility, a water-soluble polymer compound and
And an overcoat layer containing a photothermal conversion agent.
A positive lithographic printing plate precursor for infrared laser,
Beck smoothing of the contact surface that contacts the surface of the overcoat layer
Laminated paper with a degree of 3 seconds to 900 seconds
It is characterized by being made. Thus, the planographic printing plate precursor lamination of the present invention
According to the body, the Beck smoothness of the contact surface is 3 seconds or more and 900 seconds
By using the following slip paper, the
Even if the coat layer and the interleaf are rubbed, film peeling is reliably prevented.
It is. Also, the surface of the overcoat layer has adhesiveness
Even if it is, the peelability from the interleaf is improved. [0016] DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below. <Lithographic printing plate precursor> Laminated lithographic printing plate precursor of the present invention
The body is a positive lithographic printing plate precursor for infrared laser (hereinafter referred to as
Where appropriate, it is simply referred to as a lithographic printing plate precursor. ) And a specific surface
It is characterized by being laminated with slip paper having smoothness.
The Hereinafter, referring to FIG. 1 and FIG.
A planographic printing plate precursor laminate as an embodiment (hereinafter, as appropriate, simply
It is called a laminate. ). Here, FIG.
1 shows a planographic printing plate precursor laminate as an exemplary embodiment of Ming
It is a schematic perspective view. 2 is a planographic stamp of the present invention shown in FIG.
It is a perspective view which shows the state which packed the printing plate precursor laminated body. As can be seen from FIG. 1, the overcoat
The interleaf paper 14 for protecting the layer and the planographic printing plate precursor 12 are exchanged.
Overlapping each other in the thickness direction, and on the upper and lower surfaces
Laminating planographic printing plate precursor 12 with protective cardboard 16
A body 10 is constructed. Configure one laminate 10
The number of planographic printing plate precursors 12 is not particularly limited.
From the viewpoint of efficient storage, for example, 10 to 100 sheets
can do. Also, 10 to 100 sheets like this
When the laminate 10 is composed of the planographic printing plate precursor 12
The planographic printing plate precursor 12 and the protective cardboard 16 are misaligned.
Fix these with fixing means such as adhesive tape.
It is preferable. Further, more lithographic printing plate precursors 12 are used.
Therefore, the laminated body 10 is configured and more efficiently (less cargo handling)
Can be transported and stored at any time)
It is. For example, the maximum number of planographic printing plate precursors 12 is 3
About 000 sheets, 20 to 100 of the planographic printing plate precursor 12
You may make it insert the protective cardboard 16 for every sheet. The
In addition, the maximum number of planographic printing plate precursors 12 is about 3000.
The protective cardboard 16 may be placed only above and below
Yes. In addition, depending on the type of lithographic printing plate precursor 12,
The protective cardboard 16 may be omitted. An automatic plate making machine having an automatic plate feeding function or
When set on a so-called platesetter,
There is no cardboard 16 for protection, and the planographic printing plate precursor 12 and the interleaf 14
May be set in a small amount of about 2 each. The laminate 10 thus constructed is
As shown in FIG.
The inner paper 22 is pasted at a predetermined position by the tape 24 and packed.
The package 20 may be used. Inadvertently, the interior paper
22 is fixed so that it does not spread or fall off.
The plate printing plate precursor 12 is reliably shielded from light and moisture. Also,
Laminate depending on the type of lithographic printing plate precursor 12 and transportation method
10 is further packaged with an exterior box or loaded on a pallet.
It may be placed. As described above, the laminate 1 of the present invention.
According to 0, in particular, high-sensitivity type lithographic printing plate precursors are used.
The quality of the image forming surface can be reliably prevented.
The Also, the laminated body 10 of the present invention can be used as an automatic plate feeder.
For automatic plate making machines and so-called plate setters
Is set and supplied to the plate making process
However, as will be described later, the Beck smoothness is 8 seconds or more 56
Lithographic printing by using slip paper 14 of 0 seconds or less
The plate precursor 12 and the interleaf 14 are integrally conveyed to an automatic plate making machine or the like.
Can be prevented. In addition, the present invention
The laminate 10 of the planographic printing plate in the actual use situation
The user supplies the planographic printing plate precursor 12 by the automatic plate feeding mechanism.
Depending on how you use the plate or manually
Rather (in other words, as a problem before the plate feeding method), the membrane
Can prevent peeling and has good peelability
As a result, it is possible to reliably prevent the quality of the image forming surface from being deteriorated. <Positive planographic printing plate precursor for infrared laser>
> The lithographic printing plate precursor according to the present invention has light or
Increases solubility in aqueous alkali solutions due to the action of heat
Positive recording layer, water-soluble polymer compound and photothermal conversion agent
And an overcoat layer containing
It is characterized by. [Overcoat layer] Used in the present invention
The overcoat layer effectively protects the positive recording layer
At the same time, it is easily removed during development and attached by exposure.
Characterized by not absorbing the given energy
To do. Considering the above points, the auto used in the present invention.
The bar coat layer contains a water-soluble polymer compound and a photothermal conversion agent.
It is necessary to contain. (Water-soluble polymer compound) The water-soluble polymer
As the compound, polyvinyl alcohol is preferably used.
It is. As the polyvinyl alcohol, necessary water-soluble
Containing a substantial amount of unsubstituted vinyl alcohol units
Some have esters, ethers and aceters, if any
It may be substituted with Similarly, some are shared with others.
A polymerization component may be contained. With polyvinyl alcohol
Is 71 to 100% hydrolyzed and has a polymerization degree of 300 to
The thing of the range of 2400 is mentioned. Specifically, stock
Company Kuraray PVA-110, PVA-117, PVA
-117H, PVA-120, PVA-124, PVA
-124H, PVA-CS, PVA-CST, PVA-
HC, PVA-203, PVA-204, PVA-20
5, PVA-210, PVA-217, PVA-22
0, PVA-224, PVA-217EE, PVA-2
20, PVA-224, PVA-217EE, PVA-
217E, PVA-220E, PVA-224E, PV
A-405, PVA-420, PVA-613, L-8
Etc. As said copolymer, it is 88-10.
0% hydrolyzed polyvinyl acetate chloroacete
Or propionate, polyvinyl formal and
And revinyl acetals and their copolymers.
The Also, other water-soluble polymer compounds with low oxygen permeability
Can be used. Specifically, polyvinylpyrrolide
, Gelatin, cellophane, and water-soluble acrylic resin.
These may be used alone or in combination. The content of the water-soluble polymer compound is
50 to 99.7% by weight based on the total solid content of the bar coat layer
Preferably 70 to 99.5% by weight.
Are more preferable. When the content is less than 50% by weight
Tends to decrease sensitivity due to insufficient oxygen permeation prevention effect
If it exceeds 99.7% by weight, ink inking property will decrease.
Therefore, neither is preferable. In the present invention, a water-soluble polymer is formed.
As a compound, it has excellent water solubility and water dispersibility, and deposits due to accumulation
Using sugar unit-linked polymer compounds
Also good. Using such a sugar unit-linked polymer compound
Because of its physical properties, it can be continuously processed by an automatic processor.
Even if the development process is difficult, the error
No overcoating behavior and overcoat
There is no need to add a special developing bath for layer removal. The sugar unit-linked polymer compound is coated, dried.
A uniform film-like film is formed by drying.
The structure is selected from those obtained by linking sugar units,
In particular, gum arabic, soya gum, carboxymethyl
Roulose, carboxyethyl cellulose, hydroxyme
Chill cellulose, hydroxyethyl cellulose, polyhi
Droxyethylated cellulose, hydroxypropyl cell
Loin, hydroxypropylmethylcellulose, glio
Quizared hydroxypropyl methylcellulose, hydride
Roxypropyl methylcellulose phthalate, methyl
Rulose, α-cyclodextrin, β-cyclodex
Thrin, γ-cyclodextrin, white dextrin,
Red dextrin, pullulan, enzymatically decomposed etherification
String, maltized cyclodextrin, alpha
-Starch starch, grafted starch, dialdehyde starch,
Periodic acid modified starch, hydroxy ether modified starch,
Cationic starch ether, alkali cellulose, Argi
Acid, sodium alginate, ammonium alginate,
Propylene glycol ester luginate, xanthanga
Corn starch, industrial acid-modified corn starch, industrial
Industrial oxidized corn starch, industrial cationic starch, etc.
I can get lost. In addition to these, a water solution formed by linking sugars.
To select and use functional polymer compounds and their modified products
it can. Examples of these saccharides and modified products thereof include:
Glucose, fructose, xylose, galactose
, Mannose, arabinose, rhamnose, ribo
, Allose, idose, talose, furanose, pyra
The compounds mainly composed of things like North
It is. The sugar unit-linked type preferably used in the present invention.
Water-soluble polymer compounds are usually available as commercial products
For example, if the product name is given, L-
HPC series, TC-5 series, HP-MCP series
, Metro's series; Daicel Chemical Industries, HEC
Series, MFC series, CMC series;
Serogen series manufactured by Pharmaceutical Co., Ltd .; Grilo manufactured by Dainippon Pharmaceutical Co., Ltd.
Id series; manufactured by Nissho Chemical Co., Ltd.
-Made by Litt, Caldas series; Made by Matsutani Chemical, with processing
Various flour powder; Sanyo Kokusaku Pulp, Sunrose series;
Made by Nippon Food Processing Co., Celdex series;
Company, Isoelite series; Hayashibara, Pullulan;
Made by Tsu Kagaku, alginate propylene glycol ester
Leeds; Molecule in a polymer compound of sugar unit linkage type
The sugar skeleton present in the developer is 20% by weight.
It is preferable from the viewpoint of stability. If the percentage of the sugar skeleton is high
The stability is improved due to the presence of the sugar skeleton.
It is estimated that the dispersibility of the object is improved. This sugar unit chain
The water-soluble high molecular weight compound is solid in the overcoat layer.
The content is preferably 10 to 90% by weight in the minute.
More preferably, it is contained in an amount of 0 to 90% by weight, most
Preferably it is the range of 30-80 weight%. (Photothermal conversion agent)
Energy added by exposure
Is transmitted to the recording layer efficiently, that is, sensitivity
It is useful from the viewpoint of improving the quality. Also photothermal change
Storage stability is achieved by adding a replacement agent to the overcoat layer
Can also be improved. Photothermal conversion agent added to overcoat layer
Impairs the high water solubility and water dispersibility of the overcoat layer
From the standpoint that there is no water-soluble photothermal conversion agent. Main departure
The light overcoat layer dissolves instantly during development.
In addition, the recording layer is dissolved when applied on the recording layer.
Overcoat from the viewpoint of preventing and damaging
The layer coating solution is preferably one that can be applied in water. For this reason,
As a photothermal conversion agent, in particular, water-soluble or water-dispersible
Excellent water-soluble infrared absorbing dye and surface hydrophilized
Infrared absorbing pigments, metal fine particles and the like are preferable. Examples of the dye include commercially available dyes such as “dye”.
"Handbook" (edited by the Society of Synthetic Organic Chemistry, published in 1968)
The well-known thing described in literature can be utilized. concrete
For example, paragraph number of JP-A-10-39509
Names described in issue [0050] to [0051]
You can. Especially preferred among these dyes
Cyanine dye, squarylium dye, pyrylium
Examples thereof include salts and nickel thiolate complexes. In addition,
Anine dyes are preferred, particularly those represented by the following general formula (I)
Most preferred are cyanine dyes. [0035] [Chemical 1] In general formula (I), X¹Is a halogen atom,
Or X²-L¹Indicates. Where X²Is an oxygen atom or
Represents a sulfur atom and L¹Is charcoal having 1 to 12 carbon atoms
A hydrogen fluoride group is shown. R¹And R²Each independently
A hydrocarbon group having 1 to 12 atoms is shown. Recording layer coating solution
From storage stability, R¹And R²Is more than 2 carbon atoms
Is preferably a hydrocarbon group, and R¹And R²
Are bonded to each other to form a 5-membered or 6-membered ring
It is particularly preferred. Ar¹, Ar²Are the same
May be different and may have a substituent.
Represents a hydrocarbon group. Y¹, Y²Are the same but different
May be sulfur atoms or 12 or more carbon atoms
The lower dialkylmethylene group is shown. R ^Three, R^FourIs that
These may be the same or different and may have a substituent.
A good hydrocarbon group having 20 or less carbon atoms is shown. Like
As a substituent, alkoxy having 12 or less carbon atoms
Group, carboxyl group, and sulfo group. R^Five,
R⁶, R⁷And R⁸Are the same but different
Good, hydrocarbons with hydrogen atoms or carbon atoms of 12 or less
Indicates the basis. From the availability of raw materials, preferably with hydrogen atoms
is there. Z^1-Represents a counter anion. However, R¹
~ R⁸When any of the sulfo groups is substituted,
Z^1-Is not necessary. Preferred Z^1-Storage of recording layer coating solution
From stability, halogen ion, perchlorate ion, tetra
Fluoroborate ion, hexafluorophosphate
Ions and sulfonate ions, particularly preferred
Perchlorate ion, hexafluorophosphate
On and aryl sulfonate ions. Among infrared absorbing dyes, preferred for the present invention.
Examples of commonly used recording layer hydrophilic resins
Can be added uniformly to the hydrophilic matrix and easy
Water-soluble infrared-absorbing dye having the property of dissolving in water
Is mentioned. Preferred water-soluble infrared absorbing dyes below
Specific examples [(IR-1) to (IR-11)] are shown.
The invention is not limited to these. [0038] [Chemical 2][0039] [Chemical Formula 3][0040] [Formula 4] As the pigment used in the present invention,
Commercial pigment and color index (CI) handbook,
"Latest pigment handbook" (edited by the Japan Pigment Technology Association, 1977)
Published), "Latest Pigment Applied Technology" (CMC Publishing, 1986)
Published), "Printing Ink Technology" CMC Publishing, published in 1984)
Can be used. The types of pigment include black pigment, yellow face
, Orange pigment, brown pigment, red pigment, purple pigment,
Blue pigment, green pigment, fluorescent pigment, metal powder pigment, etc.
Examples include polymer-bound dyes. Details of these pigments
Is the paragraph number [005] of JP-A-10-39509.
2] to [0054], which are described in detail.
The present invention can also be applied. These pigments are water
Uniform dispersibility in soluble recording layer, water dispersibility of recording layer
From the viewpoint of improvement, it is preferable to use a surface hydrophilic treatment.
Yes. These photothermal conversion agents may be used alone.
Two or more kinds may be used in combination. The light-to-heat conversion agent is the total solid of the overcoat layer.
1-30% by weight, preferably 2-20% by weight,
It can be added in proportions. If the amount added is less than 1% by weight
If it is, it is difficult to obtain the effect of improving sensitivity, and it exceeds 30% by weight
And the light transmission in the overcoat layer decreases, and the recording layer
Tend to be less sensitive. The overcoat layer according to the present invention includes the above-mentioned
In addition to the water-soluble polymer compound, the effect of the present invention is not impaired.
In combination with various additives depending on the purpose
Can do. For example, water solubility to improve film properties
Known additives such as plasticizers may be added. Water soluble
Examples of the plasticizer include propionamide, cyclohexane, and the like.
There are sundiol, glycerin, sorbitol and the like. Ma
Add water-soluble (meth) acrylic polymer, etc.
May be. Furthermore, the adhesion of the recording layer to these polymers,
Additives may be added to improve stability over time. The overcoat layer usually contains the above components.
Dissolved in water and applied by coating on the recording layer
The It is preferable to use distilled water as the coating solvent.
Yes. Various methods can be used as the coating method.
For example, bar coater coating, spin coating, spattering
Lay coating, curtain coating, dip coating, air knife
Coating, blade coating, roll coating, etc.
The The coating amount is 0.5 g / m in weight after drying.²~ 1
0g / m²The range of is appropriate. More preferably:
0g / m²~ 5.0 g / m²It is. In the overcoat layer coating solution of the present invention
In order to provide resistance to scratches,
Compounds that reduce the coefficient of friction can also be added.
Specifically, it is used in US Pat. No. 6,117,913.
Such as esters of long-chain alkyl carboxylic acids.
I can make it. The preferred amount to add is to form a layer
The proportion of the resulting material is 0.1 to 10% by weight. Than
Preferably it is 0.5 to 5 weight%. In addition, leveling of the coating solution
In order to improve the integrity, various surfactants are added.
You can also. [Positive recording layer] Next, the infrared recording layer according to the present invention is described.
Positive type provided on the positive type lithographic printing plate precursor for line laser
The recording layer will be described. Positive recording layer according to the present invention
Is a water-insoluble and alkali-soluble polymer compound
And a photothermal conversion agent. (Highly water-insoluble and alkali-soluble component)
In the present invention, it is used in the positive recording layer and the lower layer.
Water-insoluble and alkali-soluble polymer compound used
(Hereinafter referred to as alkali-soluble polymer as appropriate)
Contains acidic groups in the main chain and / or side chain in the polymer
Homopolymers, copolymers of these or mixtures thereof
Include. Therefore, the positive recording layer according to the present invention is an Al
It has the property of dissolving when contacted with a caustic developer.
is there. Used in the positive recording layer used in the present invention.
Lucari soluble polymer is not particularly limited to conventionally known polymers.
Among these, the following (1) to (6) are listed.
Has acidic groups in the main chain and / or side chain of the polymer
Are preferred in terms of solubility in alkaline developers.
That's right. (1) Phenolic hydroxyl group (-Ar-O
H) (2) Sulfonamide group (—SO₂NH-R) (3) Substituted sulfonamide acid group (hereinafter referred to as “active imide”
It is called "base". ) [-SO₂  NHCOR, -SO₂NHSO₂R, -CO
NHSO₂R] (4) Carboxylic acid group (—CO₂H) (5) Sulfonic acid group (-SO_ThreeH) (6) Phosphate group (-OPO_ThreeH₂) In the above (1) to (6), Ar has a substituent.
Represents a divalent aryl linking group which may be
The hydrocarbon group which may have a substituent is represented. An acidic group selected from the above (1) to (6)
Among the alkaline water-soluble polymers that have (1) pheno
Group, (2) sulfonamide group and (3) active imi
Alkali water-soluble polymers having a group are preferred,
(1) a phenol group or (2) a sulfonamide group
Alkaline water-soluble polymer having an alkaline developer
Most preferable from the standpoint of ensuring sufficient solubility and film strength.
Good. Next, these alkaline water soluble polymers
A typical example of the polymerization component of the compound will be described. (1) A polymerizable monomer having a phenolic hydroxyl group
In this case, an unsaturated bond polymerizable with a phenolic hydroxyl group is removed.
A polymerizable module comprising one or more low molecular weight compounds.
For example, having a phenolic hydroxyl group.
Acrylamide, methacrylamide, acrylic acid
Steal, methacrylic acid ester, or hydroxystyrene
And the like. Specifically, for example, N- (2-H
Droxyphenyl) acrylamide, N- (3-hydro
Xylphenyl) acrylamide, N- (4-hydroxy)
Phenyl) acrylamide, N- (2-hydroxyphene)
Nyl) methacrylamide, N- (3-hydroxypheny
) Methacrylamide, N- (4-hydroxypheny)
E) Methacrylamide, o-hydroxyphenyl acrylate
Rate, m-hydroxyphenyl acrylate, p-hy
Droxyphenyl acrylate, o-hydroxypheny
Methacrylate, m-hydroxyphenyl methacrylate
, P-hydroxyphenyl methacrylate, o-hy
Droxystyrene, m-hydroxystyrene, p-hydride
Loxystyrene, 2- (2-hydroxyphenyl) ethyl
Acrylate, 2- (3-hydroxyphenyl) ethyl
Acrylate, 2- (4-hydroxyphenyl) ethyl
Acrylate, 2- (2-hydroxyphenyl) ethyl
Methacrylate, 2- (3-hydroxyphenyl) ester
Tyl methacrylate, 2- (4-hydroxyphenyl)
Examples include ethyl methacrylate. These feno
Two or more types of monomers having a rutile hydroxyl group
May be used. (2) Polymerizable module having a sulfonamide group
Nomers include at least one nitrogen atom in one molecule.
Sulfone amide group (—NH—SO
₂-) And at least one polymerizable unsaturated bond
Polymerizable monomers composed of low molecular weight compounds
For example, an acryloyl group, an allyl group, or vinyloxy
A substituted or monosubstituted aminosulfonyl group or a
Low molecular weight compounds having a substituted sulfonylimino group are preferred.
Yes. As such a compound, for example, JP-A-8-1
Represented by general formulas (I) to (V) described in No. 23029
Compounds. (2) Polymerizable module having a sulfonamide group
Specific examples of the nomer include m-aminosulfonylphenol.
Nyl methacrylate, N- (p-aminosulfonylphenol
Nyl) methacrylamide, N- (p-aminosulfonyl)
(Phenyl) acrylamide etc. can be used suitably.
Yes. (3) Polymerizable monomer having an active imide group
As an example, active activity described in JP-A-11-84657 is described.
Those having a mid group in the molecule are preferred,
One active imide group and one polymerizable unsaturated bond
Polymerizable monomers comprising the above low molecular weight compounds are listed.
I can get lost. (3) Polymerizable monomer having an active imide group
Specifically, N- (p-toluenesulfonate
) Methacrylamide, N- (p-toluenesulfoni
E) Acrylamide and the like can be preferably used. (4) Alkaline water having a carboxylic acid group
Examples of the soluble polymer include a carboxylic acid group and a polymerizable polymer.
A compound having at least one functional unsaturated group in the molecule
Polymers whose main constituent is the smallest constituent unit derived from the product
Can be mentioned. (5) An alkali-soluble polymer having a sulfonic acid group
For example, a sulfonic acid group and a polymerizable unsaturated group
Derived from a compound having one or more in the molecule
List polymers with the smallest building block as the main building block
Can do. (6) As an alkaline water-soluble polymer having a phosphate group
For example, a phosphoric acid group and a polymerizable unsaturated group are separated.
Minimum composition derived from compounds each having one or more in the child
Examples include polymers whose units are main constituents.
The For use in positive lithographic printing plate materials according to the present invention
Constituting the alkaline water-soluble polymer,
(6) The minimum structural unit having an acidic group selected from
It is not necessary to have only one type, and they have the same acidic group
2 or more minimum structural units, or have different acidic groups
Use a copolymer of two or more minimum structural units.
You can also. As a copolymerization method, conventionally known,
Graft copolymerization method, block copolymerization method, random copolymerization
The law etc. can be used. The copolymer is copolymerized (1) to (1) to
The compound having an acidic group selected from (6) is in the copolymer
Are preferably contained in an amount of 10 mol% or more,
More preferably, it is contained in an amount of at least 1%. 10 mol%
If it is less than, the alkali solubility tends to be insufficient,
The development latitude improvement effect is not sufficiently achieved
is there. An acidic group selected from the above (1) to (6)
The monomer component to be copolymerized with the compound
Exemplifying the compounds listed in (m1) to (m12)
However, it is not limited to these. (M1) 2-Hydroxyethyl acrylate or 2-H
Has an aliphatic hydroxyl group such as droxyethyl methacrylate
Acrylic esters and methacrylic esters
Kind. (M2) Methyl acrylate, ethyl acrylate, acrylic
Propyl lurate, butyl acrylate, amyl acrylate,
Hexyl acrylate, octyl acrylate, acrylic acid
Benzyl, 2-chloroethyl acrylate, glycidyl
Alkyl acrylates such as acrylates; (M3) methyl methacrylate, ethyl methacrylate, me
Propyl tacrylate, butyl methacrylate, methacryl
Amyl acid, hexyl methacrylate, cyclomethacrylate
Hexyl, benzyl methacrylate, methacrylic acid-2-
Alkyls such as chloroethyl and glycidyl methacrylate
Lemethacrylate. (M4) Acrylamide, methacrylamide, N-methyl
Roll acrylamide, N-ethyl acrylamide, N
-Hexyl methacrylamide, N-cyclohexyl aqua
Rilamide, N-hydroxyethylacrylamide, N
-Phenylacrylamide, N-nitrophenyl acrylic
Luamide, N-ethyl-N-phenylacrylamide, etc.
Acrylamide or methacrylamide. (M5) Ethyl vinyl ether, 2-chrome
Roethyl vinyl ether, hydroxyethyl vinyl ether
Tellurium, propyl vinyl ether, butyl vinyl ether
, Octyl vinyl ether, phenyl vinyl ether
Vinyl ethers such as (M6) vinyl acetate, vinyl chloroacetate,
Vinyl esters such as vinyl butyrate and vinyl benzoate
Kind. (M7) Styrene, α-methylstyrene, methylstyrene
And styrenes such as chloromethylstyrene. (M8) Methyl vinyl ketone, ethyl vinyl ketone, plastic
Vinyl such as propyl vinyl ketone and phenyl vinyl ketone
Ketones. (M9) Ethylene, propylene, isobutylene, butadi
Olefins such as ene and isoprene. (M10) N-vinylpyrrolidone, acrylonitrile,
Methacrylonitrile and the like. (M11) Maleimide, N-acryloylacrylami
, N-acetylmethacrylamide, N-propionyl
Methacrylamide, N- (p-chlorobenzoyl) meta
Unsaturated imides such as chloramide. (M12) Acrylic acid, methacrylic acid, maleic anhydride
Unsaturated carboxylic acids such as acids and itaconic acids. Examples of the alkali-soluble polymer include infrared rays.
Feder is superior in image-forming properties during exposure with a laser.
It preferably has a gnolic hydroxyl group.
Nor formaldehyde resin, m-cresol formua
Rudehydr resin, p-cresol formaldehyde resin,
m- / p-mixed cresol formaldehyde resin, phenol
Nord / cresol (m-, p-, or m- / p-mixed
Any of these) Novo such as mixed formaldehyde resin
Preferable examples are rack resin and pyrogallol acetone resin
It is done. In addition, an alkenyl having a phenolic hydroxyl group
Examples of the water-soluble polymer compound include the compounds exemplified above.
In addition, U.S. Pat. No. 4,123,279 discloses
T-Butylphenol formaldehyde as described
Rudehydr resin, octylphenol formaldehyde tree
As a substituent, an alkyl group having 3 to 8 carbon atoms such as fat
A condensed polymer of phenol and formaldehyde
I can get lost. Copolymerization of alkaline water-soluble polymer compound
As a method, a conventionally known graft copolymerization method,
Use block copolymerization, random copolymerization, etc.
it can. In the present invention, the alkali-soluble polymer is
A polymerizable monomer having a phenolic hydroxyl group;
Polymerizable monomer having honamide group or active imide
Homopolymer or copolymer of polymerizable monomer having a group
In the case of a weight average molecular weight of 2,000 or more, a number average molecule
An amount of 500 or more is preferred. More preferably, heavy
Number average molecular weight is 5,000 to 300,000, number average
The molecular weight is 800-250,000 and the dispersity (weight
(Average molecular weight / number average molecular weight) of 1.1-10
The In the present invention, the alkali-soluble polymer is a phenotype.
Nor formaldehyde resin, cresol aldehyde tree
In the case of a resin such as fat, the weight average molecular weight is 500 to 500
20,000 and a number average molecular weight of 200 to 10,000
00 is preferable. These alkali-soluble polymer compounds are
Use one or a combination of two or more
30 to 99% by weight in the total solid content of the recording layer is preferable.
40 to 95% by weight, particularly preferably 50 to 90% by weight
% Added. Addition of alkali-soluble polymer
If the amount is less than 30% by weight, the durability of the recording layer deteriorates,
Also, if it exceeds 99% by weight, it is preferred for both sensitivity and durability.
It ’s not good. (Photothermal conversion agent) Used in the present invention
A photothermal conversion agent absorbs light used for exposure and generates heat.
There is no particular limitation as long as it is a substance that absorbs light, it has absorption in the infrared region
Known as infrared absorbing dyes or infrared absorbing pigments
Various pigments or dyes can be suitably applied
The As pigments, commercially available pigments and color indexes
(CI) Handbook, “Latest Pigment Handbook” (Japan Pigment Technical Association)
Edition, 1977), "Latest Pigment Application Technology" (CMC
Published in 1986), "Printing ink technology" issued by CMC
Edition, published in 1984)
The The types of pigments are black pigment, yellow pigment, oren
Di-color pigment, brown pigment, red pigment, purple pigment, blue pigment,
Green pigments, fluorescent pigments, metal powder pigments, other polymers
Compound dyes may be mentioned. Specifically, insoluble azo pigments, a
Zorlake pigment, condensed azo pigment, chelate azo pigment, lid
Russianine pigments, anthraquinone pigments, perylene and
Perinone pigment, thioindigo pigment, quinacridone
Pigment, dioxazine pigment, isoindolinone face
Material, quinophthalone pigment, dyed lake pigment, azine face
Materials, nitroso pigments, nitro pigments, natural pigments, fluorescent pigments,
Inorganic pigments, carbon black and the like can be used. These pigments may be used without surface treatment.
Alternatively, a surface treatment may be applied. Surface treatment
Methods include surface coating with resin and wax, surface activity
Methods of attaching agents, reactive substances (eg silane
(Pulling agents, epoxy compounds, polyisocyanates, etc.)
For example, a method of binding the pigment to the pigment surface can be considered. Above table
The surface treatment method is "Characteristics and application of metal soap"
“Printing Ink Technology” (CMC Publishing, 1984) and
To "Latest Pigment Applied Technology" (CMC Publishing, 1986)
Has been described. The particle size of the pigment is 0.01 μm to 10 μm
Is preferably in the range of 0.05 μm to 1 μm.
More preferably, it is in the range of 0.1 μm to 1 in particular.
It is preferable to be in the range of μm. The particle size of the pigment is 0.0
When it is less than 1 μm, the stability of the dispersion in the recording layer coating solution
In view of the above, the recording layer exceeds 10 μm.
This is not preferable in terms of uniformity. As a method of dispersing pigments
Are known components used in ink production and toner production.
Dispersion technology can be used. Dispersers include ultrasonic dispersers,
Sand mill, attritor, pearl mill, super
Le, ball mill, impeller, despather, KD Mi
, Colloid mill, Dynatron, 3 roll mill,
For example, a pressure kneader. For details, see `` Latest pigment application technology
Saku "(CMC Publishing, published in 1986). As the dye, commercially available dyes and literature (for example,
“Dye Handbook” edited by the Society of Synthetic Organic Chemistry, published in 1970
The well-known thing described in can be utilized. Specifically
Azo dyes, metal complex azo dyes, pyrazolone azo dyes
Material, anthraquinone dye, phthalocyanine dye, carbo
Nium dye, quinoneimine dye, methine dye, cyanine
And dyes such as dyes. In the present invention, these
Infrared light or near infrared light
That absorbs light emits infrared light or near infrared light
This is particularly preferable because it is suitable for use with a laser. Absorbs such infrared light or near infrared light.
Carbon black is preferably used as the pigment
The In addition, dyes that absorb infrared light or near infrared light
For example, JP-A-58-125246, JP-A-59.
-84356, JP-A 59-202829, JP-A
Cyanine dyes described in No. 60-78787, etc.,
JP 58-173696, JP 58-18169
0, JP-A-58-194595, etc.
Methine dyes, JP-A-58-112793, JP-A-58
224793, JP 59-48187, JP
59-73996, JP-A-60-52940, JP-A-60-52940
Naphthoquinone described in Sho-60-63744
Dyes, described in JP-A No. 58-112792, etc.
Squaryllium dye, described in British Patent 434,875
And cyanine dyes. Also, as a dye, US Pat. No. 5,156,
The near infrared absorption sensitizer described in No. 938 is also preferably used.
Substituted in U.S. Pat. No. 3,881,924
Arylbenzo (thio) pyrylium salt, JP-A-57-1
42645 (U.S. Pat. No. 4,327,169)
Trimethine thiapyrylium salt, JP-A 58-1810
51, 58-220143, 59-41363
No. 59-84248 No. 59-84249 No.
Described in 59-146063 and 59-146061
Pyryllium-based compounds, JP 59-2161
46, a cyanine dye described in U.S. Pat. No. 4,283,4
No. 75 pentamethine thiopyrylium salt, etc.
Disclosure in Japanese Patent Laid-Open Nos. 5-13514 and 5-19702
As a commercially available product, an epoxy
Epolight III-178, Epo made by Phosphorus
light III-130, Epolight II
I-125 and the like are particularly preferably used. Another example that is particularly preferred as a dye is
In U.S. Pat. No. 4,756,993.
Near-infrared absorbing dyes described as (I) and (II)
Can be mentioned. These photothermal conversion agents are used in the recording layer.
0.01 to 50% by weight, preferably 0.
1 to 10% by weight, particularly preferably 0.5 to 1 in the case of dyes
0% by weight, particularly preferably 0.1 to 10% in the case of pigments
% Can be added. Amount of photothermal conversion agent added
Is less than 0.01% by weight, the sensitivity decreases, and 5
If it exceeds 0% by weight, the uniformity of the recording layer will be reduced and the durability
There is a risk of getting worse. These dyes or pigments are
May be added to the same layer as the minute, or another layer is provided there.
It may be added. (Other components) Positive recording according to the present invention
In forming the layer, if necessary, various
Additives can be added. For example, onium salt,
o-quinonediazide compounds, aromatic sulfone compounds, aromatic
It is thermally decomposable, such as aromatic sulfonic acid ester compounds.
Solubility of alkali soluble polymer compounds
In combination with a substance that substantially lowers the
This is preferable from the viewpoint of improving dissolution inhibition in a developer.
Onium salts include diazonium salts, ammonium salts,
Phosphonium salt, iodonium salt, sulfonium salt,
Examples include rhenonium salts and arsonium salts. As an onium salt used in the present invention
Suitable examples include S.I. I. Schle
singer, Photogr. Sci. Eng. , 1
8, 387 (1974), T.W. S. Bal et a
l, Polymer, 21, 423 (1980), JP
Diazonium salt described in JP-A-5-158230, rice
National Patent Nos. 4,069,055 and 4,069,056
And an ammo described in JP-A-3-140140.
Ni salt, D.I. C. Necker et al, Mac
romolecules, 17, 2468 (198
4), C.I. S. Wenetal, Teh, Proc.
Conf. Rad. Curing ASIA, p478
  Tokyo, Oct (1988), US Pat. No. 4,0
69,055 and 4,069,056
Honium salt, J.M. V. Crivello et al,
Macromolecules, 10 (6), 1307
(1977), Chem. & Eng. News, N
ov. 28, p31 (1988), European Patent No. 104,
143, U.S. Pat. Nos. 339,049 and 410,
201, JP-A-2-150848, JP-A-2-29
Iodonium salts described in No. 6514; V. Criv
ello et al, Polymer J. et al. 17, 7
3 (1985), J. Am. V. Crivello et a
l. J. et al. Org. Chem. , 43, 3055 (197
8), W.W. R. Watt et al, J.A. Polym
er Sci. , Polymer Chem. Ed. ,
22, 1789 (1984), J. MoI. V. Crivell
o et al, Polymer Bull. , 14, 2
79 (1985), J. Am. V. Crivello et
al, Macromolecules, 14 (5), 1
141 (1981), J. MoI. V. Crivello et
  al, J. et al. Polymer Sci. , Polyme
r Chem. Ed. , 17, 2877 (1979),
European Patent Nos. 370,693, 233,567, and
297,443, 297,442, US Patent
4,933,377, 3,902,114, 4
10,201, 339,049, 4,760,
013, 4,734,444, 2,833,8
No. 27, German Patent No. 2,904,626, No. 3,60
Sulfos described in 4,580 and 3,604,581
Ni salts, J. Org. V. Crivello et al, M
acromolecules, 10 (6), 1307.
(1977), J.M. V. Crivello et a
l, J. et al. Polymer Sci. , Polymer
Chem. Ed. , 17, 1047 (1979)
Selenonium salt of C.I. S. Wen et al, Te
h, Proc. Conf. Rad. Curing AS
IA, p478 Tokyo, Oct (1988)
Listed arsonium salts. Among onium salts
However, diazonium salts are particularly preferred. Also particularly suitable
As a suitable diazonium salt, JP-A-5-158230
Examples listed in the report. The counter ion of the onium salt is tetrafluoride.
Boric acid, hexafluorophosphoric acid, triisopropylnaphthalene
Sulfonic acid, 5-nitro-o-toluenesulfonic acid, 5
-Sulfosalicylic acid, 2,5-dimethylbenzenesulfo
Acid, 2,4,6-trimethylbenzenesulfonic acid, 2
-Nitrobenzenesulfonic acid, 3-chlorobenzenesulfuric acid
Phosphonic acid, 3-bromobenzenesulfonic acid, 2-fluoro
Capryl naphthalene sulfonic acid, dodecyl benzene sul
Phosphonic acid, 1-naphthol-5-sulfonic acid, 2-methoxy
Ci-4-hydroxy-5-benzoyl-benzenesulfo
Acid, p-toluenesulfonic acid, etc.
Yes. Among these, especially hexafluorophosphoric acid, triisopropyl
Lopylnaphthalenesulfonic acid and 2,5-dimethylbenze
Alkyl aromatic sulfonic acids such as sulfonic acids are preferred
It is. Suitable quinonediazides include o-quino.
And diazide compounds. Used in the present invention
The o-quinonediazide compound obtained is at least one
It is a compound having o-quinonediazide group.
Compounds with various structures that increase alkali solubility
Can be used. That is, o-quinonediazide is
Losing the ability to inhibit the dissolution of the binder by thermal decomposition;
Non-diazide itself turns into an alkali-soluble substance.
Helps the solubility of the sensitive material system by both effects. The present invention
Examples of o-quinonediazide compounds used in
J. By Korser “Light-sensitive system”
(John Wiley & Sons. In
c. ) The compounds described on pages 339 to 352 can be used.
In particular, various aromatic polyhydroxy compounds or aromatic compounds
O-Quinonediazide reacted with aromatic amino compounds
Preferred are sulfonic acid esters or sulfonic acid amides.
Also described in Japanese Patent Publication No. 43-28403
Such benzoquinone (1,2) -diazide sulfonate
Rholide or naphthoquinone- (1,2) -diazide-5
-Sulfonic acid chloride and pyrogallol-acetone resin
, US Pat. No. 3,046,120 and the same
Benzoquinone described in 3,188,210
-(1,2) -diazidosulfonic acid chloride or naphth
Toquinone- (1,2) -diazide-5-sulfonic acid chloride
Esthetics between ride and phenol-formaldehyde resin
Is also preferably used. Further, naphthoquinone- (1,2) -diazi
Do-4-sulfonic acid chloride and phenol formal
Dehydric resin or cresol-formaldehyde resin
And naphthoquinone- (1,2) -diazide-
4-sulfonic acid chloride and pyrogallol-acetone tree
Ester with fat is also preferably used. Other existence
Numerous patents for o-quinonediazide compounds
Reported and known. For example, JP-A 47-5303
No. 4, JP-A-48-63802, JP-A-48-6380
3, JP-A-48-96575, JP-A-49-387
01, JP-A-48-13354, JP-B-41-11
222, Shoko 45-9610, Shoko 49-17
481, U.S. Pat. No. 2,797,213, No. 3,
No. 454,400, No. 3,544,323, No.
3,573,917, 3,674,495,
No. 3,785,825, British Patent No. 1,227,60
No. 2, No. 1,251,345, No. 1,267,0
05, 1,329,888, 1,330,
932, German Patent No. 854,890, etc.
You can list those listed in the book. The amount of o-quinonediazide compound added is preferred.
1 to 50% by weight based on the total solid content of the recording layer, more preferably
Preferably it is 5 to 30% by weight, particularly preferably 10 to 30%.
The amount is in the range of%. These compounds can be used alone
However, it may be used as a mixture of several kinds. Additives other than o-quinonediazide compounds
The addition amount is preferably 1 to 50% by weight, more preferably
5 to 30% by weight, particularly preferably 10 to 30% by weight
The In the present invention, the additive and the binder are contained in the same layer.
It is preferable to make it. Further, in order to further improve the sensitivity, an annular shape is used.
Use of acid anhydrides, phenols, and organic acids in combination
it can. Cyclic acid anhydrides include U.S. Pat. No. 4,115,
Phthalic anhydride, teto described in No. 128
Lahydrophthalic anhydride, hexahydrophthalic anhydride,
3,6-endooxy-Δ4-tetrahydroanhydrophthalic acid
Acid, tetrachlorophthalic anhydride, maleic anhydride, chlorine
Maleic anhydride, α-phenylmaleic anhydride, anhydrous
Succinic acid, pyromellitic anhydride, etc. can be used. Fe
Examples of the diols include bisphenol A and p-nitrophe.
Nord, p-ethoxyphenol, 2,4,4'-tri
Hydroxybenzophenone, 2,3,4-trihydroxy
Cibenzophenone, 4-hydroxybenzophenone,
4,4 ', 4 "-trihydroxytriphenyl meta
4,4 ', 3 ", 4" -tetrahydroxy-
3,5,3 ', 5'-tetramethyltriphenylmethane
Etc. Furthermore, as organic acids, JP-A-6-6
No. 0-88942, JP-A-2-96755, etc.
The sulfonic acids, sulfinic acids, al
Killed sulfuric acids, phosphonic acids, phosphate esters and cal
Bonic acids, etc., specifically p-toluenesulfo
Acid, dodecylbenzenesulfonic acid, p-toluenesulfuric acid
Finic acid, ethyl sulfate, phenylphosphonic acid, phenyl
Phosphinic acid, phenyl phosphate, diphenyl phosphate,
Benzoic acid, isophthalic acid, adipic acid, p-toluic acid,
3,4-dimethoxybenzoic acid, phthalic acid, terephthalate
Acid, 4-cyclohexene-1,2-dicarboxylic acid, L
Caric acid, lauric acid, n-undecanoic acid, ascorbic acid
Etc. The above cyclic acid anhydrides and phenols
And the proportion of organic acids in the recording layer is 0.05-2.
0 wt% is preferred, more preferably 0.1 to 15 wt%
%, Particularly preferably 0.1 to 10% by weight. In the recording layer coating solution according to the present invention,
To widen the stability of processing with respect to development conditions,
JP-A-2-251740 and JP-A-3-208514
Nonionic surfactants as described in
59-121044, Japanese Patent Laid-Open No. 4-13149
Amphoteric surfactant, EP950 as described in
Siloxane compounds as described in 517 gazette
Described in JP-A-11-288093
Such fluorine-containing monomer copolymer can be added
it can. Specific examples of nonionic surfactants include sorbi
Tantristearate, sorbitan monopalmitate,
Sorbitan trioleate, monoglyceride stearate
And polyoxyethylene nonylphenyl ether
I can get lost. Specific examples of double-sided activators include alkyl dialkyls.
(Aminoethyl) glycine, alkyl polyaminoethyl
Glycine hydrochloride, 2-alkyl-N-carboxyethyl
-N-hydroxyethyl imidazolinium betaine or N
-Tetradecyl-N, N-betaine type (eg trade name
“Amorgen K” (Daiichi Kogyo Co., Ltd.)
The Examples of siloxane compounds include dimethylsiloxane
And block copolymers of polyalkylene oxide are preferred
As a specific example, DBE-22 manufactured by Chisso Corporation
4, DBE-621, DBE-712, DBP-73
2, DBP-534, made by Tego, Germany, Tego Gl
Polyalkylene oxide modified silico such as ide100
Can be mentioned. The nonionic surfactant and
The proportion of the amphoteric surfactant in the recording layer is from 0.05 to
15 wt% is preferable, more preferably 0.1 to 5 wt%
%. In the positive recording layer of the present invention, exposure is performed.
Bake-out agent to obtain a visible image immediately after heating by,
Dyes and pigments as image colorants can be added.
As print-out agent, acid is released by heating by exposure.
Of organic dyes that can form a salt with the compound (photoacid releasing agent)
Combinations can be mentioned as representatives. In particular,
JP-A-50-36209 and 53-8128
O-Naphthoquinonediazide-4-s
Combinations of sulfonic acid halides and salt-forming organic dyes,
Kaisho 53-36223, 54-74728, 6
0-3626, 61-143748, 61-1
It describes in each gazette of 51644 and 63-58440
Of trihalomethyl compounds and salt-forming organic dyes
Combinations can be mentioned. Such trihalomethylation
As compounds, oxazole compounds and triazine compounds
Both have excellent stability over time and clear baking
Give out the image. As the colorant of the image, the above-mentioned salt forming property is present.
Other dyes can be used in addition to the machine dye. Salt formation
Oil-soluble dyes and bases as suitable dyes, including organic dyes
Sex dyes can be listed. Specifically, oil yellow
-# 101, Oil Yellow # 103, Oil Pink #
312, Oil Green BG, Oil Blue BOS, Oh
Ilblue # 603, Oil Black BY, Oil Bra
BS, Oil Black T-505 (orientated
Chemical Industry Co., Ltd.), Victoria Pure Blue, Chris
Tal violet (CI42555), methyl violet
(CI42535), ethyl violet, loader
Min B (CI145170B), Malachite Green
(CI42000), methylene blue (CI5201)
5). JP-A 62-2
The dyes described in Japanese Patent No. 93247 are particularly preferred
Yes. These dyes are 0.01% of the total solid content of the recording layer.
10 wt%, preferably 0.1 to 3 wt%
Can be added to the recording layer. Furthermore, it is used for this invention.
In the recording layer, the flexibility of the coating film is given if necessary.
In order to do so, a plasticizer is added. For example, butylphthalate
Polyethylene glycol, tributyl citrate,
Diethyl talate, dibutyl phthalate, dihexyl phthalate
, Dioctyl phthalate, tricresyl phosphate, phosphoric acid
Tributyl, trioctyl phosphate, tetrahioleate
Drofurfuryl, acrylic or methacrylic oligo
Polymers and polymers are used. Positive recording of a lithographic printing plate precursor according to the present invention
The layer is usually prepared by dissolving each of the above components in a solvent and using a suitable support.
It can manufacture by apply | coating on. here
Solvents used include ethylene dichloride, cyclohexane
Hexanone, methyl ethyl ketone, methanol, etano
, Propanol, ethylene glycol monomethyl ether
Ether, 1-methoxy-2-propanol, 2-methoxy
Cyethyl acetate, 1-methoxy-2-propylacetate
Tate, dimethoxyethane, methyl lactate, ethyl lactate,
N, N-dimethylacetamide, N, N-dimethylform
Muamide, tetramethylurea, N-methylpyrrolide
, Dimethyl sulfoxide, sulfolane, γ-butyro
Kuton, toluene, etc. can be raised but limited to this
Is not to be done. These solvents can be used alone or as a mixture
Used. The above components in the solvent (total solid including additives
The concentration of form) is preferably 1 to 50% by weight. In addition, coating on a support obtained after coating and drying.
The amount of cloth (solid content) varies depending on the application, but photosensitive printing
Speaking of plates, generally 0.5 to 5.0 g / m²Prefer
Good. As the application amount decreases, the apparent sensitivity is
Although it becomes large, the film characteristics of the photosensitive film deteriorate. Those who apply
As the method, various methods can be used.
Bar coater coating, spin coating, spray coating, car
Ten coating, dip coating, air knife coating, blade
Examples thereof include coating and roll coating. In the photosensitive layer according to the present invention, the coatability is improved.
Surfactants for improving, for example, JP-A 62-170
Fluorosurfactant as described in 950 publication
An agent can be added. The preferred addition amount is the recording layer.
0.01 to 1% by weight in the total solid content, more preferably 0.
05 to 0.5% by weight. [Support] In the lithographic printing plate precursor according to the invention,
The support used is a dimensionally stable plate.
For example, paper, plastic (for example, polyester
Laylene, polypropylene, polystyrene, etc.)
Paper, metal plate (eg, aluminum, zinc, copper)
Etc.), plastic film (eg, cellulose acetate)
, Cellulose triacetate, cellulose propionate, butyric acid
Cellulose, cellulose acetate butyrate, cellulose nitrate, polyethylene
Reethylene terephthalate, polyethylene, polystyrene
Polypropylene, polycarbonate, polyvinyl alcohol
Settal, etc.), and the above metal is laminated,
Includes vapor-deposited paper or plastic film
Be turned. As the support of the present invention, polyester film
Or aluminum plate is preferred, among which dimensional stability
Aluminum plates that are good and relatively inexpensive are particularly preferred.
That's right. Suitable aluminum plates are pure aluminum plates and
Alloy plate containing aluminum as a main component and containing trace amounts of foreign elements
In addition, aluminum is laminated or evaporated.
It may be a plastic film. Aluminum alloy
The foreign elements contained in silicon include silicon, iron, manganese, copper,
Gnesium, chromium, zinc, bismuth, nickel, titanium
Etc. The content of foreign elements in the alloy is at most 10 wt.
% Or less. Aluminum particularly suitable in the present invention
Is pure aluminum but completely pure aluminum
Is difficult to manufacture due to refining technology.
It may be contained. Thus applied to the present invention
Aluminum plate is not specified for its composition.
In addition, a well-known and publicly-used aluminum plate is appropriately used.
Can be used. Aluminum used in the present invention
The thickness of the plate is about 0.1mm to 0.6mm, preferably
Or 0.15 mm to 0.4 mm, particularly preferably 0.
2 mm to 0.3 mm. Prior to roughening the aluminum plate,
If desired, for example, the surface activity to remove surface rolling oil
Degreasing treatment with an organic agent, organic solvent or alkaline aqueous solution
Is done. The roughening treatment of the surface of the aluminum plate
This can be done in various ways, for example mechanically roughening
A method for electrochemically dissolving and roughening a surface; and
It is carried out by a method of selectively dissolving the surface chemically. Machine
Mechanical methods include ball polishing, brush polishing, and bra
Use known methods such as strike polishing and buff polishing
Can do. As an electrochemical surface roughening method, hydrochloric acid or
There is a method of performing AC or DC in nitric acid electrolyte.
Moreover, it is disclosed by Unexamined-Japanese-Patent No. 54-63902.
You can also use a method that combines both
The The roughened aluminum plate can be used as needed.
After the alkaline etching treatment and neutralization treatment,
Anodic acid to increase surface water retention and wear resistance as desired
Processing is performed. For anodizing of aluminum plates
The electrolyte that can be used is a species that forms a porous oxide film.
Various electrolytes can be used, generally sulfuric acid, phosphoric acid,
Succinic acid, chromic acid or a mixed acid thereof is used. So
The concentration of these electrolytes is determined appropriately according to the type of electrolyte.
It is. The treatment conditions for anodization depend on the electrolyte used.
Since it varies, it is not possible to specify it in general, but in general electrolytes
Concentration of 1-80 wt% solution, liquid temperature is 5-70 ° C., current
Density 5-60A / dm², Voltage 1-100V, Electrolysis time
A range of 10 seconds to 5 minutes is appropriate. Anodized film
Is 1.0 g / m²If it is less, the printing durability is insufficient.
Or the non-image part of the planographic printing plate is easily scratched,
Ink adheres to the scratched part during printing.
This is likely to occur. After anodizing,
If necessary, the surface of the minium is subjected to a hydrophilic treatment. Main departure
As the hydrophilization treatment used for clarity, US Pat. No. 2,7
14,066, 3,181,461, 3,2
Disclosed in 80,734 and 3,902,734.
Alkali metal silicates such as sodium silicate
(Thorium aqueous solution) method. In this way, support
The body is soaked in aqueous sodium silicate solution or
The solution is processed. Also disclosed in Japanese Patent Publication No. 36-22063
Shown potassium zirconate fluoride and U.S. Patent No.
3,276,868, 4,153,461, the same
Polyvinyl as disclosed in US Pat. No. 4,689,272
A method of treating with nylphosphonic acid is used. [Undercoat layer] Planographic printing plate precursor according to the invention
Is provided with a positive recording layer on a support.
If necessary, an undercoat layer can be provided therebetween. under
Various organic compounds are used as coating layer components.
Carboxymethylcellulose, dextrin, ara
Amino groups such as beer gum and 2-aminoethylphosphonic acid
Phosphonic acids having a phenyl group which may have a substituent
Phosphonic acid, naphthylphosphonic acid, alkyl phosphone
Acid, glycerophosphonic acid, methylenediphosphonic acid and ether
Organic phosphonic acids such as tylenediphosphonic acid, with substituents
Phenyl phosphate, naphthyl phosphate, alkyl
Organophosphoric acid such as phosphoric acid and glycerophosphoric acid, substituents
Phenylphosphinic acid, naphthylphosphite
Acids, alkylphosphinic acids and glycerophosphinic acids
Organic phosphinic acids such as glycine and β-alanine
Amino acids, and triethanolamine hydrochloride
Selected from hydrochlorides of amines having various hydroxy groups
However, you may use it in mixture of 2 or more types. This organic undercoat layer is provided by the following method.
Can be. That is, water or methanol, ethanol
Or organic solvents such as methyl ethyl ketone
A solution of the above organic compound in a mixed solvent of
Applying and drying on a minium plate and water or
Organics such as ethanol, ethanol, methyl ethyl ketone
Dissolve the above organic compounds in a solvent or mixed solvent.
An aluminum plate is immersed in the dissolved solution, and the above compound
Adsorbed, then washed with water etc., dried and organic
This is a method of providing an undercoat layer. In the former method, the above
Seed a solution of organic compound in a concentration of 0.005 to 10% by weight
It can be applied in various ways. In the latter method, the concentration of the solution
The degree is 0.01 to 20% by weight, preferably 0.05 to 5 times.
%, And the immersion temperature is 20 to 90 ° C., preferably 25
-50 ° C, immersion time is preferably 0.1 second to 20 minutes
Or 2 seconds to 1 minute. The solution used for this is ammonia.
Basic substances such as a, triethylamine, potassium hydroxide
PH 1-12 depending on the quality and acidic substances such as hydrochloric acid and phosphoric acid
It is also possible to adjust to the range. Also for image recording materials
Yellow dye can be added to improve tone reproducibility
The The coating amount of the organic undercoat layer is 2 to 200 mg / m²But
Suitable, preferably 5-100 mg / m²It is.
The above coating amount is 2 mg / m²Less than enough
Performance cannot be obtained. 200 mg / m²Bigger
But the same is true. A positive type lithographic stamp produced as described above
The plate precursor is imagewise exposed according to the plate making method according to the present invention.
After that, it is subjected to development processing. Used for image exposure
As an active light source that emits light from the near infrared to the infrared region,
A light source with a light wavelength is preferred, such as a solid state laser
The is preferred. The emission wavelength is 760 to 1200n.
m is preferred. As the developer, an alkaline aqueous solution is preferred.
In addition, a preferable pH range is pH 10.5 to 1
A range of 2.5, pHll. Range of 0 to 12.5
Further developing with an alkaline aqueous solution
preferable. PH less than 10.5 as alkaline aqueous solution
When using a material, the non-image area tends to become dirty.
Yes, develop with an aqueous solution with a pH exceeding 12.5
There is a risk that the strength of the image area will be reduced. An alkaline aqueous solution is used as the developer.
As a developer and replenisher for the image recording material of the present invention.
A conventionally known alkaline aqueous solution can be used. For example,
Sodium silicate, potassium, sodium triphosphate
Sodium, potassium, ammonium, dibasic sodium phosphate
, Potassium, ammonium, sodium carbonate,
Potassium, ammonium, sodium bicarbonate, potassium
Lium, ammonium, sodium borate, potassium
, Ammonium, sodium hydroxide, ammonia
Inorganic alkali salts such as sodium, potassium and lithium
I can get lost. Monomethylamine, dimethylamine,
Trimethylamine, monoethylamine, diethylamino
, Triethylamine, monoisopropylamine, dii
Sopropylamine, triisopropylamine, n-butyl
Luamine, monoethanolamine, diethanolamine
, Triethanolamine, monoisopropanolamine
, Diisopropanolamine, ethyleneimine, ethyl
Organic alkali agents such as range amine and pyridine are also used.
The These alkaline agents are used alone or in combination of two or more.
Used. Further, when developing using an automatic processor.
Is an aqueous solution (replenisher) with higher alkali strength than the developer.
In the developer tank for a long time by adding
A large amount of lithographic printing plates can be processed without changing the developer.
It is known that This replenishment method is also used in the present invention.
Is preferably applied. Developer and replenisher include developer
Promotion and suppression, dispersion of development residue, and printing plate image area
In order to improve the ink affinity, various surface activity
Sexual agents and organic solvents can be added. As a preferred surfactant
Anionic, cationic, nonionic and amphoteric
Surfactant is mentioned. In addition, the developer and replenisher
If necessary, hydroquinone, resorcin, sulfurous acid,
Sodium and potassium salts of inorganic acids such as bisulfite
Reducing agent such as organic carboxylic acid, antifoaming agent, water softener
Can also be added. Development processing is performed using the developer and replenisher.
The printed plate is rinsed with rinsing water, surfactant, etc.
Solution, desensitizing solution containing gum arabic or starch derivatives
It is done. The image recording material of the present invention is used as a printing plate
As a post-processing for
Can be used. In recent years, the plate making work has been rationalized in the plate making / printing industry.
Widely used for automatic processing machines for printing plates for standardization and standardization
It has been. This automatic processor is generally used for developing and post-processing.
Consists of an apparatus for conveying the printing plate
Consisting of a playing device, it conveys the exposed printing plate horizontally.
While spraying each processing liquid pumped up by the pump
And then developing. Also recently
In-liquid guide roll in a processing liquid tank filled with processing liquid
Also known is the method of immersing and transporting printing plates
ing. In such automatic processing, each processing solution is processed.
Process while replenishing the replenisher according to the amount of work or operating time.
Can be. Also, treatment with virtually unused processing solution
A so-called disposable processing method can also be applied. In the planographic printing plate precursor according to the present invention,
Image exposure, development, rinsing and / or rinsing and / or
Unnecessary image area in planographic printing plate obtained by gumming (example
For example, when there is a film edge mark of the original film)
In this case, the unnecessary image portion is erased. This
Such erasure is described in, for example, Japanese Patent Publication No. 2-13293
Apply an erasing solution like that on the unnecessary image area.
Leave it for a specified time and then wash it with water.
This method is preferred, but JP-A-59-174842.
Guided by optical fiber as described in
Developed after irradiating unnecessary image area with unnecessary actinic ray
Laws are also available. As described above, according to the plate making method of the present invention.
The obtained lithographic printing plate can be coated with a desensitized gum if desired.
Later, it can be used in the printing process, but even more
Burning when you want a lithographic printing plate with high printing durability
Is given. When burning a lithographic printing plate,
Before the training, Japanese Examined Sho 61-2518, 55-280
62, JP-A-62-31859, 61-1596
Treat with a surface-conditioning solution as described in each publication of No. 55
It is preferable. As the method, soak the surface conditioning liquid
Apply on the lithographic printing plate with a sponge or absorbent cotton
Or dip the printing plate in a vat filled with surface-adjusting solution.
Application methods such as cloth application and automatic coater are applied.
The Also, after application, squeegee or squeegee
It is more preferable to make the coating amount uniform with a roller.
Give good results. The coating amount of the surface conditioning liquid is generally 0.03 to 0.8.
g / m²(Dry weight) is appropriate. The surface-adjusting solution is applied
If necessary, the planographic printing plate is dried and then burned.
Processor (for example, Fuji Photo Film Co., Ltd.)
Burning processor on sale: “BP-130
0 ") or the like. In this case, the heating temperature and
Depending on the type of ingredients that form the image,
The range of 1 to 20 minutes is preferable in the range of 180 to 300 ° C.
Yes. Burning-processed planographic printing plate is necessary
Depending on the conventional method, washing with water, gumming, etc.
Water-soluble polymer compound that can be treated
If a surface-conditioning liquid containing etc. is used, gumming etc.
The so-called desensitizing treatment can be omitted. this
Planographic printing plates obtained by various processes are offset printing
It is used for printing a large number of sheets. <Interleaving Paper> As interleaving paper used in the present invention,
Table of the overcoat layer provided on the lithographic printing plate precursor described above
Beck smoothness of the contact surface in contact with the surface (JIS P811
9) is 3 seconds or more and 900 seconds or less.
Features. As the slip sheet, the Beck smoothness is as described above.
If the conditions are met, the material and Beck smoothness other than
Physical properties are not particularly limited. Therefore, the material cost is low
It is possible to manufacture slip sheets at low cost by selecting
it can. For example, 100% wood pulp is used as interleaving paper.
Paper and synthetic pulp without using 100% wood pulp
Paper and the low density polyethylene on the surface of these papers
Paper or the like provided with a ren layer can be used. In particular, synthetic pulp
Unused paper reduces the cost of materials, which reduces costs.
A slip sheet can be manufactured. More specifically, the drift
Basis weight 30-60g / made from white kraft pulp
m², Density 0.7-0.85 g / cm^Three, Moisture 4-6%,
There is a slip of PH4-6, but of course limited to this
Not. In this way, the slip sheet has the above-mentioned contact portion at the base.
If the smoothness condition is satisfied, the material is not limited.
I can't. Therefore, by selecting low-cost materials,
Cost reduction of the planographic printing plate precursor laminate of the invention can also be achieved
it can. [0105] The present invention will be described below with reference to examples.
The scope of the present invention is not limited to these examples. <Infrared laser positive type lithographic printing plate precursor 1
Production> [Preparation of substrate] Aluminum plate with a thickness of 0.3 mm (material
1050) was washed with trichlorethylene and degreased
After, nylon brush and 400 mesh pumice-water suspension
The surface was grained with a liquid and washed thoroughly with water. This
Plate in a 25% aqueous sodium hydroxide solution at 45 ° C. for 9 seconds
Immerse and etch, rinse with water, and then add 20% nitric acid
For 20 seconds and washed with water. Of the grained surface at this time
Etching amount is about 3g / m ²Met. Next, this plate
% Sulfuric acid as electrolyte and current density 15A / dm²3g /
m²After providing the direct current anodic oxide coating, it is washed with water, dried,
Furthermore, a 2.5 wt% aqueous solution of sodium silicate at 30 ° C.
Treat for 10 seconds, apply the following undercoat liquid, and coat the film at 80 ° C
The substrate was obtained by drying for 15 seconds. The coating amount after drying is 1
5mg / m²Met. [0107] [Undercoat liquid]   ・ The following compound 0.3g   ・ Methanol 100g   ・ Water 1g [0108] [Chemical formula 5] (Preparation of positive-type planographic printing plate precursor)
A coating amount of 1.0 after drying the following recording layer coating solution on a substrate
g / m²After coating to become 140 seconds at 50 ° C
It was dried for a while to form a recording layer. [0110] [Coating liquid for recording layer] N- (4-aminosulfonylphenyl) methacrylamide / acrylonitrile / Methyl methacrylate (35/35/30: weight average molecular weight 50000)                                                           1.896g ・ Novolac resin (Sumitomo Durres Sumilite Resin PR54020)                                                           0.332g ・ Cyanine dye A (the following structure) 0.155g ・ 4,4'-bishydroxyphenylsulfone 0.063g ・ Tetrahydrophthalic anhydride 0.190g ・ 0.008 g of p-toluenesulfonic acid ・ Change the counterion of ethyl violet to 6-hydroxynaphthalenesulfonic acid 0.05g -Fluorosurfactant (Megafac F176, manufactured by Dainippon Ink Industries, Ltd.)                                                           0.145g ・ Fluorosurfactant (Megafac MCF-312 (30%), Dainippon Ink 0.120g manufactured by Kogyo Co., Ltd. ・ Methyl ethyl ketone 26.6g 1-methoxy-2-propanol 13.6 g ・ Γ-Butyrolactone 13.8g [0111] [Chemical 6] Next, the following overcoat is formed on the recording layer.
Apply the coating solution and dry it at 100 ° C for 90 seconds.
A lithographic printing plate precursor 1 was obtained by forming a coat layer. After drying
The coating amount is 0.22 g / m²Met. [0113] [Overcoat layer coating solution] ・ Water-soluble polymer compound (gum arabic) 0.420g ・ Photothermal conversion agent (IR-8) 0.042g ・ Polyalkylene glycol compounds (polyethylene glycol, molecular weight 500 00) 0.0021g ・ Water 22.000g <Infrared laser positive lithographic printing plate precursor 2
And preparation of lithographic printing plate precursor 1 as described above.
Forming the overcoat layer in the manufacturing process
In the same manner, except for
A planographic printing plate precursor 2 (Reference Example 1) was obtained. In addition, the above
In the process of preparing the lithographic printing plate precursor 1,
-Except for removing the photothermal conversion agent from the coating layer coating solution
And an overcoat layer that does not contain a photothermal conversion agent
A lithographic printing plate precursor 3 (Reference Example 2) was obtained. [Evaluation of planographic printing plate precursor] [Scratch resistance test] The obtained lithographic printing plate precursor 1 was used as HEID.
Diamond (0.4mm) using ON company scratch tester
Scratch the plate under load, then Fuji Photo
Developer DT-1 (Diluted, conductivity 4)
Developed with 5 mS / cm) and can see the scratches.
The weight was measured and evaluated according to the following criteria. Load 80g
The above is a level with no practical problem. ○: 100g or more ○ to Δ: 80 g or more and less than 100 g Δ: 60 g or more and less than 80 g Δ to ×: 40 g or more and less than 60 g X: Less than 40 g Table 1 shows the results of the scratch resistance evaluation. [Sensitivity evaluation] Sensitivity of the obtained lithographic printing plate precursor
The degree was measured as follows. Master for lithographic printing plate 1
Beam strength with a Trend setter manufactured by Creo
Solid image at 2-5W and drum rotation speed 150rpm
After drawing, the developer DT- from Fuji Photo Film Co., Ltd.
1 (diluted 1: 8) and Fuji Photo Film
Finisher FP2W (diluted 1: 1)
PS process manufactured by Fuji Photo Film Co., Ltd.
Sir 900H was used, the liquid temperature was kept at 30 degrees, and the development time was 1
Developed in 2s. At this time, the conductivity of the developer is 4 respectively.
It was 5 mS / cm. The developed plate with a 50X magnifier
Observe the exposure bee where no pot-like residual film is observed.
The intensity was determined based on the following criteria. ○: Exposure beam intensity 100 mJ / cm²Less than Δ: Exposure beam intensity 100 mJ / cm²Over 120m
J / cm²Less than ×: Exposure beam intensity 120 mJ / cm²Over The results are shown in Table 1. [0117] [Table 1] As apparent from Table 1, the planographic printing plate precursor 1
Has good scratch resistance and can be recorded with high sensitivity.
I understand that On the other hand, the planographic printing plate precursor 2 is over
Since it does not have a coating layer, it can be recorded with high sensitivity.
However, the scratch resistance is poor. The planographic printing plate precursor 3 is
-Since the bar coat layer does not contain a photothermal conversion agent,
Although the damage is good, high-sensitivity recording is difficult. [Embodiment] Planographic printing plate precursor 1 and Beck flat
10 sheets each of slip sheets with a sliding degree of 400 degrees are laminated,
The laminated body 1 of an Example was produced. The laminated body 1 is automatically fed.
Set on a functional plate setter, etc.
Peeling of the interleaf paper from the overcoat layer when feeding to the plate machine
Evaluation of ease of peeling and peeling of overcoat layer
did. As a result, the laminate 1 of the example according to the present invention is a film.
The peelability can be completely prevented and the peelability is good.
It was good. [0120] According to the present invention, film peeling is reliably prevented.
And a lithographic printing plate precursor laminate having good releasability
Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing a planographic printing plate precursor laminate as an exemplary embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the planographic printing plate precursor laminate of the present invention shown in FIG. 1 is packed. [Description of Symbols] 10 Laminated body 12 Planographic printing plate precursor 14 Interleaf paper 16 Protective cardboard 20 Packing body 22 Interior paper 24 Adhesive tape

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H025 AA16 AB03 AC08 AD03 CB42                       CB43 CB45 CB52 CC20 DA01                       DA02 FA03 FA17                 2H096 AA07 AA08 BA09 BA16 BA20                       CA20 EA04 GA08 LA16                 2H114 AA04 AA22 AA24 BA01 DA51                       EA10 GA03 GA09 GA27 GA34                       GA38

Claims (1)

What is claimed is: 1. A positive recording layer on a support that has increased solubility in an aqueous alkali solution by the action of light or heat;
An overcoat layer containing a water-soluble polymer compound and a photothermal conversion agent, and a positive planographic printing plate precursor for infrared laser, and a Beck smoothness of 3 in contact with the surface of the overcoat layer. A planographic printing plate precursor laminate, which is formed by laminating slip sheets having a duration of from 2 seconds to 900 seconds.