EP4360880A1 - Précurseur de plaque d'impression lithographique, procédé de préparation de plaque d'impression lithographique et procédé d'impression lithographique - Google Patents

Précurseur de plaque d'impression lithographique, procédé de préparation de plaque d'impression lithographique et procédé d'impression lithographique Download PDF

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Publication number
EP4360880A1
EP4360880A1 EP23204033.7A EP23204033A EP4360880A1 EP 4360880 A1 EP4360880 A1 EP 4360880A1 EP 23204033 A EP23204033 A EP 23204033A EP 4360880 A1 EP4360880 A1 EP 4360880A1
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EP
European Patent Office
Prior art keywords
group
compound
lithographic printing
printing plate
image
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP23204033.7A
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German (de)
English (en)
Inventor
Akira Sakaguchi
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Fujifilm Corp
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Fujifilm Corp
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Publication of EP4360880A1 publication Critical patent/EP4360880A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B41C1/1016—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/02—Cover layers; Protective layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/12—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by non-macromolecular organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/08—Developable by water or the fountain solution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers

Definitions

  • the present disclosure relates to a lithographic printing plate precursor, a method of preparing a lithographic printing plate, and a lithographic printing method.
  • a lithographic printing plate is composed of lipophilic image areas that receive ink during a printing process and hydrophilic non-image areas that receive a dampening water.
  • Lithographic printing is a printing method that utilizes the property that water and oil-based ink repel each other to cause differences in ink attachment behavior on a surface of the lithographic printing plate by using lipophilic image areas on the lithographic printing plate as an ink-receiving area and using hydrophilic non-image areas on the lithographic printing plate as dampening water-receiving areas (non-ink-receiving areas), thereby depositing the ink only to the image areas, and then transferring the ink to a printing material, such as paper.
  • a printing material such as paper.
  • a lithographic printing plate precursor (PS plate) has been widely used which is obtained by providing a lipophilic photosensitive resin layer (image-recording layer) on a hydrophilic support.
  • PS plate a lithographic printing plate precursor
  • a lithographic printing plate is obtained by a plate making method of exposing a lithographic printing plate precursor through an original picture such as a lith film, then keeping a portion of an image-recording layer that will be an image area while removing other unnecessary portions of the image-recording layer by dissolving such portions in an alkaline developer or an organic solvent, and forming a non-image area by exposing a surface of the hydrophilic support.
  • the on-press development is a method of exposing a lithographic printing plate precursor, then immediately mounting the precursor on a printer without performing development of the related art, and removing an unnecessary portion of the image-recording layer at an initial stage of the ordinary printing step.
  • lithographic printing plate precursor that can be used for such on-press development is called "on-press development type lithographic printing plate precursor”.
  • lithographic printing plate precursors in the related art examples include those described in WO2021/259637A .
  • WO2021/259637A describes a lithographic printing plate precursor including a support, a photopolymerizable layer, and protective layer, in which the photopolymerizable layer contains a polymerizable compound, a first infrared absorber having a specific structure, and a photopolymerization initiator, and the protective layer contains a second infrared absorber which includes a thermally decomposable group transformed into a group that is a stronger electron donor upon exposure to heat and/or infrared radiation, and which is capable of forming a print-out image upon exposure to heat and/or infrared radiation.
  • An object of an embodiment of the present disclosure is to provide a lithographic printing plate precursor having excellent crystal precipitation suppressiveness.
  • An object of another embodiment of the present disclosure is to provide a method of preparing a lithographic printing plate and a lithographic printing method in which the lithographic printing plate precursor is used.
  • Means for solving the above issues include the following aspects.
  • Z represents P or N
  • R A1 to R A4 each independently represent a hydrogen atom, an alkyl group, or an aryl group.
  • R 21 's each independently represent an alkyl group and R 22 represents a hydrogen atom or an alkyl group.
  • Z represents P or N
  • R represents an alkyl group
  • Ar's each independently represent an aryl group.
  • ⁇ 5> The lithographic printing plate precursor described in any one of ⁇ 1> to ⁇ 4>, in which the cation in the compound A has a polymerizable group.
  • ⁇ 6> The lithographic printing plate precursor described in any one of ⁇ 1> to ⁇ 4>, in which clogP of the cation in the compound A is 0 or more and 10 or less.
  • an anion in the compound A is at least one anion selected from the group consisting of R 1 SO 3 - , R 1 SO 2 - , R 1 R 2 PO 2 - , R 1 PO 3 2- , R 1 CO 2 - , R 1 O - , R 1 S - , (R 1 SO 2 ) 2 N - , and R 1 R 2 R 3 R 4 B - .
  • R 1 to R 4 each independently represent a hydrogen atom, an alkyl group, or an aryl group.
  • ⁇ 9> The lithographic printing plate precursor described in any one of ⁇ 1> to ⁇ 4>, in which a molar content of the cation in the compound A is 0.2 times to 4 times a molar content of an anion in the borate compound.
  • X's each independently represent a halogen atom, and R 3 represents an aryl group.
  • lithographic printing plate precursor described in any one of ⁇ 1> to ⁇ 4>, further including a protective layer on the image-recording layer.
  • the protective layer contains a second infrared absorber which includes a thermally decomposable group transformed into a group that is a stronger electron donor upon exposure to heat and/or infrared radiation, and which is capable of forming a print-out image upon exposure to heat and/or infrared radiation.
  • Ar 1 and Ar 2 each independently represent an optionally substituted aromatic hydrocarbon group or an aromatic hydrocarbon group having an optionally substituted benzene ring
  • W 1 and W 2 each independently represent a sulfur atom, an oxygen atom, or NR*, where R* represents an optionally substituted alkyl group, NH, or -CM 10 M 11 group
  • M 10 and M 11 each independently represent an optionally substituted aliphatic hydrocarbon group or an optionally substituted aryl group or heteroaryl group
  • M 1 and M 2 each independently represent a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a group of atoms required to form an optionally substituted cyclic structure of M 1 and M 2
  • M 3 and M 4 each independently represent an optionally substituted aliphatic hydrocarbon group
  • M 5 to M 8 each independently represent a hydrogen atom, a halogen atom, or an optionally substituted aliphatic hydrocarbon group
  • M 9 is a group which is converted into a group that
  • a method of preparing a lithographic printing plate including a step of exposing the lithographic printing plate precursor according to any one of ⁇ 1> to ⁇ 4> in a shape of an image, and a step of supplying at least one material selected from the group consisting of a printing ink and dampening water on a printer to remove the image-recording layer in a non-image area.
  • a lithographic printing method including a step of exposing the lithographic printing plate precursor according to any one of ⁇ 1> to ⁇ 4> in a shape of an image
  • alkyl group includes not only an alkyl group having no substituent (unsubstituted alkyl group) but also an alkyl group having a substituent (substituted alkyl group).
  • (meth)acryl is a term used to explain a concept including both the acryl and methacryl
  • (meth)acryloyl is a term used to explain a concept including both the acryloyl and methacryloyl.
  • step in the present specification means not only an independent step but also a step that cannot be clearly differentiated from other steps as long as the intended goal of the step is achieved.
  • % by mass has the same definition as “% by weight”
  • part by mass has the same definition as “part by weight”.
  • each component contained in a composition or each constitutional unit contained in a polymer one component or one constitutional unit may be used alone, or two or more components or two or more constitutional units may be used in combination.
  • the amount of each component in the composition or the amount of each constitutional unit in the polymer means the total amount of the plurality of corresponding substances present in the composition or the total amount of the plurality of corresponding constitutional units present in the polymer.
  • each of the weight-average molecular weight (Mw) and number-average molecular weight (Mn) is a molecular weight that is detected using a gel permeation chromatography (GPC) analysis device using TSKgel GMHxL, TSKgel G4000HxL, and TSKgel G2000HxL (trade names, manufactured by Tosoh Corporation) as columns, tetrahydrofuran (THF) as a solvent, and a differential refractometer, and expressed in terms of polystyrene as a standard substance.
  • GPC gel permeation chromatography
  • the term "lithographic printing plate precursor” refers not only to a lithographic printing plate precursor but also to a key plate precursor.
  • the term “lithographic printing plate” refers not only to a lithographic printing plate prepared by performing operations such as exposure and development as necessary on a lithographic printing plate precursor but also to a key plate.
  • the key plate precursor is not necessarily subjected to the operations such as exposure and development.
  • the key plate refers to a lithographic printing plate precursor to be mounted on a plate cylinder that is not used, in a case where monochromatic or dichromatic printing is carried out on a part of paper during, for example, color newspaper printing.
  • excellent in printing durability means the large number of sheets can be printed using the lithographic printing plate.
  • the lithographic printing plate precursor according to the present disclosure includes a support and an image-recording layer on the support, in which the image-recording layer contains a non-onium-based polymerization initiator, a borate compound, an infrared absorber, and a compound A which is an onium salt consisting of a cation having a shape index equal to or less than 2 times a shape index of a cationic moiety of the infrared absorber.
  • the lithographic printing plate precursor according to the present disclosure is suitably used as an on-press development type lithographic printing plate precursor.
  • the inventors of the present invention have found that in a lithographic printing plate precursor in which the image-recording layer contains the borate compound and the infrared absorber, precipitation of the crystal formed from the borate compound and the infrared absorber may be observed.
  • the image-recording layer contains a non-onium-based polymerization initiator, a borate compound, an infrared absorber, and a compound A which is an onium salt consisting of a cation having a shape index equal to or less than 2 times a shape index of a cationic moiety of the infrared absorber.
  • the compound A can weaken the interaction between the borate compound and the infrared absorber, which are used together in the image-recording layer, and as a result, can inhibit the precipitation of the crystal formed from the borate compound and the infrared absorber. Therefore, the lithographic printing plate precursor according to the present disclosure has excellent crystal precipitation suppressiveness.
  • the image-recording layer contains a non-onium-based polymerization initiator, a borate compound, an infrared absorber, and a compound A which is an onium salt consisting of a cation having a shape index equal to or less than 2 times a shape index of a cationic moiety of the infrared absorber.
  • the image-recording layer is preferably a negative tone image-recording layer and more preferably a water-soluble or water-dispersible negative tone image-recording layer.
  • a non-exposed portion of the image-recording layer is preferably removable by at least any of dampening water or printing ink.
  • the image-recording layer contains the compound A.
  • the compound A is an onium salt consisting of a cation having a shape index equal to or less than 2 times a shape index of the cationic moiety of the infrared absorber.
  • the infrared absorber may be a salt of a cation and an anion or may be a compound having a betaine structure, and both of the salt and compound are collectively called "cationic moiety".
  • the compound A is an onium salt consisting of an onium cation having a shape index equal to or less than 2 times a shape index of the cationic moiety of the infrared absorber, and an anion. That is, in a case where a shape index of the cationic moiety of the infrared absorber represents "S I " and a shape index of the cation of the compound A represents "S A ", the infrared absorber and the compound A according to the present disclosure satisfy the relationship in which the ratio (S A /S I ) is less than 2.
  • the compound A is preferably a compound having no polymerization initiation ability.
  • a shape index is a molecular shape index which is calculated by the following method.
  • the shape index is calculated using DataWarrior (an open source program provided by openmolecules.org) Ver. 5.5.0.
  • two atoms having the longest topological distance are determined.
  • the length of the shortest chain connecting the two atoms is larger than the length of the shortest chain connecting any other atomic pairs.
  • a shape index is a value obtained by dividing the number of atoms included in the shortest chain connecting the two atoms by the total number of atoms included in the molecule.
  • the shape index of a compound that has a perfectly linear shape is 1.0, and the larger the number of rings or branches in a molecule is, the lower the shape index is.
  • the value of the ratio (S A /S I ) may be less than 2.0, and is preferably 1.8 or less, and from the viewpoint of printing durability, more preferably 1.5 or less, and even more preferably 1.0 or less.
  • Examples of the shape index of the cation of the compound A include 0.90 or less, and from the viewpoint of crystal precipitation suppressiveness, the shape index thereof is preferably less than 0.75, more preferably 0.70 or less, even more preferably 0.60 or less, and particularly preferably equal to or less than the shape index of the cationic moiety of the infrared absorber.
  • Examples of the lower limit of the shape index of the cation of the compound A include 0.20 or more, and from the viewpoint close to the shape index of the borate compound, the lower limit thereof is preferably 0.3 or more.
  • the shape index of the cation of the compound A is preferably 0.20 to 0.90, more preferably 0.20 to 0. 70, and even more preferably 0.30 to 0.70, from the viewpoint of satisfying the value of the above-described ratio (S A /S I ) and from the viewpoint close to the shape index of the borate compound.
  • clogP of the cation in the compound A is preferably -10 or more and 20 or less, more preferably -5 or more and 15 or less, even more preferably 0 or more and 10 or less, and particularly preferably 2 or more and 8 or less.
  • clogP is calculated by the following method.
  • clogP is calculated which is the logarithm of its partition coefficient between n-octanol and water log(Coctanol/Cwater).
  • the compound A is not particularly limited as long as it is an onium salt consisting of a cation having a shape index equal to or less than a shape index of the cationic moiety of the infrared absorber, but from the viewpoint of crystal precipitation suppressiveness, the compound A is preferably an ammonium salt compound, a phosphonium salt compound, a sulfonium salt compound, or a sulfoxonium salt compound, more preferably an ammonium salt compound, a phosphonium salt compound, or a sulfonium salt compound, even more preferably an ammonium salt compound or a phosphonium salt compound, and particularly preferably a phosphonium salt compound.
  • the phosphonium salt compound is preferably a quaternary phosphonium salt compound and more preferably a monoalkyl triaryl phosphonium salt compound.
  • the ammonium salt compound is preferably a quaternary ammonium salt compound and more preferably a monoalkyl triaryl ammonium salt compound.
  • the sulfonium salt compound is preferably a tertiary sulfonium salt compound and more preferably a monoalkyl diaryl sulfonium salt compound.
  • the sulfoxonium salt compound is preferably a trialkyl sulfoxonium salt compound.
  • the central element of the cation of the compound A and the central element of the cationic moiety of the infrared absorber be different elements.
  • the anion that the compound A has may be a monovalent anion or a polyvalent anion having a valency of two or more, but from the viewpoint of crystal precipitation suppressiveness, is preferably a monovalent anion.
  • the anion that the compound A has is not particularly limited, but from the viewpoint of crystal precipitation suppressiveness, is preferably at least one anion selected from the group consisting of a halide ion, a tetrafluoroborate anion, a hexafluorophosphate anion, a benzene sulfonate anion, a 1-naphthalene sulfonate anion, a 2-naphthalene sulfonate anion, a benzoate anion, a phenyl phosphate anion, a phenol anion, a thiophenol anion, a tetraphenyl borate anion, and a tosylate anion, more preferably at least one anion selected from the group consisting of a bromide ion, an iodide ion, a tetrafluoroborate anion, and a tosylate anion, even more preferably a bromide ion
  • the anion that the compound A has is preferably at least one anion selected from the group consisting of a bromide ion, an iodide ion, a tetrafluoroborate anion, a benzene sulfonate anion, a 1-naphthalene sulfonate anion, a 2-naphthalene sulfonate anion, a benzoate anion, a phenyl phosphate anion, and a tosylate anion, more preferably at least one anion selected from the group consisting of a benzene sulfonate anion, a 1-naphthalene sulfonate anion, a 2-naphthalene sulfonate anion, and a tosylate anion, and particularly preferably at least one anion selected from the group consisting of a 1-naphthalene sulfulf
  • the anion that the compound A has is preferably a conjugate base of an organic acid, more preferably a conjugate base of an organic carboxylic acid or an organic sulfonic acid, even more preferably a conjugate base of an organic sulfonic acid, and particularly preferably a conjugate base of an aromatic sulfonic acid.
  • the anion that the compound A has is preferably at least one anion selected from the group consisting of R 1 SO 3 - , R 1 SO 2 - , R 1 R 2 PO 2 - , R 1 PO 3 2- , R 1 CO 2 - , R 1 O - , R 1 S - , (R 1 SO 2 ) 2 N - , and R 1 R 2 R 3 R 4 B - , more preferably at least one anion selected from the group consisting of R 1 SO 3 - , R 1 SO 2 - , R 1 R 2 PO 2 - , R 1 PO 3 2- , and R 1 CO 2 - , and particularly preferably R 1 SO 3 - .
  • R 1 to R 4 each independently represent a hydrogen atom, an alkyl group, or an aryl group.
  • the anion that the compound A has is preferably an anion having a conjugate acid with a pKa of 4 or less and more preferably an anion having a conjugate acid with a pKa of 0 or less.
  • the cation in the compound A is preferably a cation represented by Formula (A).
  • Z represents P or N
  • R A1 to R A4 each independently represent a hydrogen atom, an alkyl group, or an aryl group.
  • Z in Formula (A) is preferably P.
  • the alkyl group represented by R A1 to R A4 in Formula (A) is preferably an alkyl group having 1 to 16 carbon atoms, more preferably an alkyl group having 1 to 12 carbon atoms, and particularly preferably an alkyl group having 1 to 8 carbon atoms.
  • the alkyl group may be a linear or branched alkyl group or may be an alkyl group having a ring structure.
  • the alkyl group may have a substituent.
  • substituents include a halogen atom, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, a vinyl ether group, an acyl group, an acyloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, a vinyloxycarbonyl group, a (meth)acryloxy group, a (meth)acrylamide group, and the like.
  • the substituents may be further substituted with the substituents.
  • the aryl groups represented by R A1 to R A4 in Formula (A) preferably each independently represent a phenyl group or a 2,4,6-trimethylphenyl group and more preferably each independently represent a phenyl group.
  • the aryl group may have a substituent.
  • substituents include a halogen atom, an alkyl group, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, an acyl group, an acyloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, a vinyloxycarbonyl group, a (meth)acryloxy group, a (meth)acrylamide group, and the like.
  • the substituents may be further substituted with the substituents.
  • the cation in the compound A is more preferably a cation represented by Formula (1).
  • Z represents P or N
  • R represents an alkyl group
  • Ar's each independently represent an aryl group.
  • Z in Formula (1) is preferably P.
  • R in Formula (1) is preferably an alkyl group having 1 to 16 carbon atoms, more preferably an alkyl group having 1 to 12 carbon atoms, and particularly preferably an alkyl group having 1 to 8 carbon atoms.
  • the alkyl group may be a linear or branched alkyl group or may be an alkyl group having a ring structure.
  • the alkyl group may have a substituent.
  • substituents include a halogen atom, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, a vinyl ether group, an acyl group, an acyloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, a vinyloxycarbonyl group, a (meth)acryloxy group, a (meth)acrylamide group, and the like.
  • the substituents may be further substituted with the substituents.
  • Ar in Formula (1) each independently are preferably a phenyl group or a 2,4,6-trimethylphenyl group and more preferably a phenyl group.
  • the aryl group may have a substituent.
  • substituents include a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an acyl group, an acyloxy group, and the like.
  • the cation in the compound A is more preferably a cation represented by Formula (2).
  • R 21 's each independently represent an alkyl group and R 22 represents a hydrogen atom or an alkyl group.
  • R 21 in Formula (2) is preferably an alkyl group having 1 to 16 carbon atoms, more preferably a branched alkyl group having 3 to 12 carbon atoms, even more preferably a branched alkyl group having 3 to 8 carbon atoms, and particularly preferably a t-butyl group.
  • three R 21 's in Formula (2) are preferably the same groups.
  • R 22 in Formula (2) is preferably a hydrogen atom or an alkyl group having 1 to 16 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, even more preferably a hydrogen atom, a methyl group, or an ethyl group, and particularly preferably a hydrogen atom.
  • the alkyl group represented by R 21 and R 22 may have a substituent.
  • substituents include a halogen atom, an aryl group, an alkenyl group, an alkoxy group, an aryloxy group, a vinyl ether group, an acyl group, an acyloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, a vinyloxycarbonyl group, a (meth)acryloxy group, a (meth)acrylamide group, and the like.
  • the substituents may be further substituted with the substituents.
  • the cation in the compound A has a polymerizable group.
  • the polymerizable group is preferably an ethylenically unsaturated group, and preferred examples thereof include a (meth)acryloxy group, a (meth)acrylamide group, an allyl group, a styryl group, a vinyl ether group, a vinyl ester group, and the like.
  • At least one group selected from the group consisting of a (meth)acryloxy group and a (meth)acrylamide group is preferable, and a (meth)acryloxy group is more preferable.
  • Preferred examples of the cation having a polymerizable group include a cation obtained by adding a polymerizable compound which will be described later (preferably a (meth)acrylic compound, and more preferably a (meth)acrylate compound) to a compound having a direct bond between a phosphorus atom or a nitrogen atom and a hydrogen atom by the Michael addition reaction.
  • a polymerizable compound which will be described later preferably a (meth)acrylic compound, and more preferably a (meth)acrylate compound
  • the polymerizable compound is preferably a polyfunctional (meth)acrylic compound and more preferably a polyfunctional (meth)acrylate compound.
  • suitable examples of the cation forming the compound A include the following cations. It goes without saying that the cation is not limited thereto.
  • suitable examples of the compound A include an onium salt of any one of D1 to D24 and D29 to D31 described below and one anion selected from the group consisting of a halide ion, a tetrafluoroborate anion, a hexafluorophosphate anion, a benzene sulfonate anion, a 1-naphthalene sulfonate anion, 2-naphthalene sulfonate anion, a benzoate anion, a phenyl phosphate anion, a phenol anion, a thiophenol anion, a tetraphenylborate anion, and a tosylate anion.
  • Only one compound A may be added to the image-recording layer, or two or more compounds A may be used in combination.
  • the content of the compound A with respect to the total mass of the image-recording layer is preferably 0.01% by mass to 30% by mass, more preferably 0.05% by mass to 25% by mass, and even more preferably 0.1% by mass to 20% by mass.
  • the content of the compound A per unit area of the image-recording layer is preferably 0.001 g/m 2 to 3 g/m 2 , more preferably 0.005 g/m 2 to 1 g/m 2 , even more preferably 0.01 g/m 2 to 0.1 g/m 2 , and particularly preferably 0.01 g/m 2 to 0.05 g/m 2 .
  • the molar content of the cation of the compound A is preferably 0.1 times to 5 times the molar content of the anion in the borate compound, more preferably 0.2 times to 4 times the molar content of the anion in the borate compound, and particularly preferably 0.5 times to 3 times the molar content of the anion in the borate compound.
  • the image-recording layer contains a non-onium-based polymerization initiator.
  • the non-onium-based polymerization initiator means a polymerization initiator other than the onium-based polymerization initiator.
  • the non-onium-based polymerization initiator is a compound other than the onium salt compound, which accepts one electron by intermolecular electron migration in a case where electrons of an infrared absorber are excited by exposure to infrared, and generates a polymerization initiation species such as radicals.
  • non-onium-based polymerization initiator a known non-onium-based polymerization initiator used for an image-recording layer of a lithographic printing plate precursor can be suitably used.
  • the non-onium-based polymerization initiator preferably includes an electron-donating polymerization initiator.
  • the non-onium-based polymerization initiator preferably includes a compound represented by Formula (II) as an electron-donating polymerization initiator.
  • X's each independently represent a halogen atom, and R 3 represents an aryl group.
  • X in Formula (II) include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
  • X is preferably a chlorine atom or a bromine atom because these have excellent sensitivity, and is particularly preferably a bromine atom.
  • R 3 examples include a phenyl group and a naphthyl group.
  • substituent of the aryl group represented by R 3 include a halogen atom, a hydroxy group, an amide group, an amino group, a cyano group, an alkyl group, and an alkoxy group.
  • the substituent is preferably a hydroxy group.
  • R 3 is preferably a phenyl group substituted with a hydroxy group.
  • the lowest unoccupied molecular orbital (LUMO) of the electron-accepting polymerization initiator as the non-onium-based polymerization initiator is preferably -3.00 eV or less and more preferably -3.02 eV or less.
  • the lower limit of LUMO is preferably -3.80 eV or more and more preferably -3.60 eV or more.
  • the energy of molecular orbital such as the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) is calculated by the following methods.
  • free counter ions in the compound as a calculation object are excluded from the calculation object.
  • counter anions are excluded from the calculation object
  • counter cations are excluded from the calculation object.
  • the structural optimization is carried out by DFT (B3LYP/6-31G(d)) using quantum chemical calculation software Gaussian 16.
  • DFT DFT
  • PCM PCM
  • the optimum structure mentioned herein means a structure in which the total energy obtained by DFT calculation is the most stable.
  • the most stable structure is found by repeating the structural optimization as necessary.
  • Escaled 0.823168 ⁇ 27.2114 ⁇ Ebare ⁇ 1.07634
  • Escaled 0.820139 ⁇ 27.2114 ⁇ Ebare ⁇ 1.086039
  • 27.2114 is simply a coefficient for converting heartree into eV, and 0.823168 and -1.07634 used for calculating HOMO and 0.820139 and -1.086039 used for calculating LUMO are adjustment coefficients. These are determined such that the calculated values of HOMO and LUMO of the compound as a calculation object match the measured values.
  • One non-onium-based polymerization initiator may be used alone, or two or more non-onium-based polymerization initiators may be used in combination.
  • the content of the non-onium-based polymerization initiator with respect to the total mass of the image-recording layer is preferably 0.1% by mass to 50% by mass, more preferably 0.5% by mass to 30% by mass, and particularly preferably 0.8% by mass to 20% by mass.
  • the image-recording layer contains a borate compound.
  • the borate compound is preferably a tetraaryl borate compound or a monoalkyltriaryl borate compound, from the viewpoint of compound stability, more preferably a tetraaryl borate compound, and particularly preferably a tetraphenyl borate compound.
  • the counter cation that the borate compound has is not particularly limited, but is preferably an alkali metal ion or a tetraalkyl ammonium ion and more preferably a sodium ion, a potassium ion, or a tetrabutylammonium ion.
  • the counter cation that the borate compound has may be the cationic moiety of the infrared absorber.
  • borate compound examples include sodium tetraphenyl borate.
  • the highest occupied molecular orbital (HOMO) of the borate compound is preferably -6.00 eV or more, more preferably -5.95 eV or more, even more preferably -5.93 eV or more, and particularly preferably more than -5.90 eV
  • the upper limit of HOMO is preferably -5.00 eV or less and more preferably -5.40 eV or less.
  • borate compound suitably include the electron-donating polymerization initiators described in WO2020/262692A .
  • HOMO of the infrared absorber - HOMO of the borate compound preferably is 0.70 eV or less.
  • Only one borate compound may be added to the image-recording layer, or two or more borate compounds may be used in combination.
  • the content of the borate compound with respect to the total mass of the image-recording layer is preferably 0.01% by mass to 30% by mass, more preferably 0.05% by mass to 25% by mass, and even more preferably 0.1% by mass to 20% by mass.
  • the image-recording layer contains an infrared absorber.
  • the infrared absorber is not particularly limited as long as it is an infrared absorber having a cationic moiety in the molecule, and examples thereof include a pigment and a dye.
  • the shape index of the cationic moiety of the infrared absorber is, for example, preferably 0.2 to 0.8 and more preferably 0.3 to 0.6.
  • the dye that is used as the infrared absorber it is possible to use the dyes which has the cationic moiety in the molecule, of commercially available dyes and known dyes described in publications, for example, " Dye Handbooks” (edited by the Society of Synthetic Organic Chemistry, Japan, 1970 ).
  • dyes such as an azo dye, a metal complex azo dye, a pyrazolone azo dye, a naphthoquinone dye, an anthraquinone dye, a phthalocyanine dye, a carbonium dye, a quinoneimine dye, a methine dye, a cyanine dye, a squarylium colorant, a pyrylium salt, and a metal thiolate complex.
  • dyes such as an azo dye, a metal complex azo dye, a pyrazolone azo dye, a naphthoquinone dye, an anthraquinone dye, a phthalocyanine dye, a carbonium dye, a quinoneimine dye, a methine dye, a cyanine dye, a squarylium colorant, a pyrylium salt, and a metal thiolate complex.
  • a cyanine dye having a cationic moiety and an anionic moiety in the molecule is particularly preferable.
  • the cyanine dye include the compounds described in paragraphs "0017” to “0019” of JP2001-133969A and the compounds described in paragraphs "0016” to "0021” of JP2002-023360A and paragraphs "0012” to "0037” of JP2002-040638A .
  • the cyanine dye for example, the compounds described in paragraphs "0034" to "0041” of JP2002-278057A and paragraphs “0080” to "0086” of JP2008-195018A are preferable, and the compounds described in paragraphs "0035” to "0043” of JP2007-90850A and the compounds described in paragraphs "0105” to "0113” of JP2012-206495A are particularly preferable.
  • the infrared absorber as long as it has a cationic moiety in the molecule, for example, an infrared absorber that decomposes by exposure to infrared (decomposition-type infrared absorber) can also be used.
  • the infrared absorber or a decomposition product thereof may promote polymerization, and the decomposition product of the infrared absorber and the polymerizable compound may interact with each other, which may result in excellent printing durability.
  • the decomposition-type infrared absorber is preferably an infrared absorber that performs a function of forming color by absorbing infrared and decomposing by exposure to infrared.
  • a color-forming compound formed as a result of infrared absorption and decomposition of the decomposition-type infrared absorber by exposure to infrared will be also called "color forming substance of the decomposition-type infrared absorber”.
  • the decomposition-type infrared absorber have a function of absorbing infrared by exposure to infrared and converting the absorbed infrared into heat.
  • the decomposition-type infrared absorber may be an infrared absorber that decomposes by absorbing at least a part of light in the infrared wavelength region (wavelength of 750 nm to 1 mm).
  • the decomposition-type infrared absorber is preferably an infrared absorber having a maximal absorption wavelength in a wavelength region of 750 nm to 1,400 nm, and more preferably an infrared absorber having a maximal absorption wavelength in a wavelength region of 760 nm to 900 nm.
  • the decomposition-type infrared absorber is preferably a compound that decomposes upon the exposure to infrared and generates a compound having maximal absorption wavelength in a wavelength region of 500 nm to 600 nm.
  • the decomposition-type infrared absorber is preferably an infrared absorber that decomposes by either or both of heat and electron migration resulting from exposure to infrared, and more preferably an infrared absorber that decomposes by electron migration resulting from exposure to infrared.
  • "Decomposes by electron migration” mentioned herein means that electrons excited to the lowest unoccupied molecular orbital (LUMO) from the highest occupied molecular orbital (HOMO) of the decomposition-type infrared absorber by exposure to infrared move to electron accepting groups (groups having potential close to LUMO) in a molecule by means of intramolecular electron migration and thus result in decomposition.
  • infrared absorber and the infrared absorber that decomposes by exposure to infrared those described in WO2020/262692A can also be suitably used.
  • infrared absorber that decomposes by exposure to infrared
  • those described in JP2008-544322A or WO2016/027886A can also be suitably used.
  • the infrared absorbing compounds described in WO2019/219560A can be suitably used.
  • the highest occupied molecular orbital (HOMO) of the infrared absorber used in the present disclosure is preferably -5.00 eV or less and more preferably -5.30 eV or less.
  • the lower limit of HOMO of the infrared absorber is preferably -5.90 eV or more, more preferably -5.75 eV or more, and even more preferably -5.60 eV or more.
  • infrared absorber Only one infrared absorber may be used, or two or more infrared absorbers may be used in combination.
  • infrared absorber a pigment and a dye may be used in combination.
  • the total content of the infrared absorber in the image-recording layer with respect to the total mass of the image-recording layer is preferably 0.1% by mass to 10.0% by mass and more preferably 0.5% by mass to 5.0% by mass.
  • One of the preferred aspects in the present disclosure is an aspect including a compound in which an infrared absorber (preferably a cyanine dye) and a borate compound form a salt.
  • an infrared absorber preferably a cyanine dye
  • a borate compound form a salt.
  • Specific examples of the compound in which the infrared absorber and the borate compound form a salt include a salt of a cationic moiety of an infrared absorber (preferably a cyanine dye) and a borate anion (for example, a tetraphenyl borate anion).
  • the image-recording layer contains both the infrared absorber and the borate compound.
  • the compound in which the infrared absorber and the borate compound form a salt may be used in combination with another infrared absorber or in combination with another borate compound.
  • HOMO of the borate compound is preferably -6.0 eV or more, and LUMO of the non-onium-based polymerization initiator is preferably -3.0 eV or less.
  • HOMO of the borate compound and LUMO of the non-onium-based polymerization initiator are as described above.
  • energy transfer may occur among the borate compound, the infrared absorber, and the non-onium-based polymerization initiator.
  • radicals may be more efficiently generated, which may facilitate further improvement of chemical resistance and printing durability.
  • HOMO of the infrared absorber - HOMO of the borate compound is preferably 1.0 eV or less, more preferably 0.70 eV or less, and particularly preferably 0.60 eV or less. From the same viewpoints as above, HOMO of the infrared absorber - HOMO of the borate compound is preferably -0.200 eV or more and more preferably -0.100 eV or more. The negative sign means that HOMO of the borate compound is higher than HOMO of the infrared absorber.
  • LUMO of the non-onium-based polymerization initiator - LUMO of the infrared absorber is preferably 1.00 eV or less, and more preferably 0.700 eV or less. From the same viewpoints as above, LUMO of the non-onium-based polymerization initiator - LUMO of the infrared absorber is preferably -0.200 eV or more, and more preferably -0.100 eV or more.
  • LUMO of the non-onium-based polymerization initiator - LUMO of the infrared absorber is preferably 1.00 eV to -0.200 eV, more preferably 0.700 eV to -0.100 eV
  • the negative sign means that LUMO of the infrared absorber is higher than LUMO of the non-onium-based polymerization initiator.
  • the image-recording layer may contain an acid color forming agent.
  • Acid color forming agent used in the present disclosure means a compound having a property of forming color by being heated in a state of accepting an electron-accepting compound (for example, a proton of an acid or the like) and thus changing the color of the image-recording layer.
  • the acid color forming agent is particularly preferably a colorless compound which has a partial skeleton such as lactone, lactam, sultone, spiropyran, an ester, or an amide and allows such a partial skeleton to rapidly open the ring or to be cleaved when coming into contact with an electron-accepting compound.
  • the hydrogen abstraction enthalpy of all hydrogen atoms present in a molecule of the acid color forming agent is preferably -6.5 kcal/mol or more, more preferably -4.0 kcal/mol or more, even more preferably -2.0 kcal/mol or more, and particularly preferably -2.0 kcal/mol to 50 kcal/mol.
  • the hydrogen abstraction enthalpy of all hydrogen atoms present in a molecule of the acid color forming agent is calculated by the following method.
  • the enthalpy of each of the reactant and product is calculated using Gaussian 16 as a calculation program at a calculation level of density functional theory (B3LYP/6-31+G**).
  • the solvent effect (solvent: methanol) is examined by the SCRF method. By finding the difference in the enthalpy between the reactant and the product, a reaction enthalpy is calculated.
  • the hydrogen abstraction enthalpy is calculated as follows.
  • modeling is carried out using Gaussian pre/post software GaussView6.
  • #p is specified for detailed logging output, and may not be specified.
  • the enthalpy of formation of the reactant (sum of the energy of the propagating radical and LeucoDye-H) and the enthalpy of formation of the product (sum of the energy of the hydrogenated propagating radical and LeucoDye-radical) are calculated.
  • the enthalpy of formation of the reactant is subtracted from the enthalpy of formation of the product, and the result is adopted as the hydrogen abstraction enthalpy.
  • the acid color forming agent do not have a structure in which a hydrogen atom is directly bonded to a nitrogen atom.
  • N-H structure The structure in which a hydrogen atom is directly bonded to a nitrogen atom (N-H structure) is a structure in which a hydrogen abstraction reaction readily occurs by a radical or the like.
  • the acid color forming agent is a compound that does not have such a structure, the hydrogen atom abstraction from the acid color forming agent is inhibited, and the polymerization reaction is prolonged. Therefore, excellent curing property is obtained, and printing durability, particularly, UV printing durability is further improved.
  • the acid color forming agent used in the present disclosure is preferably at least one compound selected from the group consisting of a spiropyran compound, a spirooxazine compound, a spirolactone compound, and a spirolactam compound.
  • the color tone of the acid color forming agent after color forming is preferably green, blue, or black.
  • the acid color forming agent preferably includes a leuco dye, and is more preferably a leuco dye.
  • the leuco dye is not particularly limited as long as it has a leuco structure.
  • the leuco dye preferably has a spiro structure, and more preferably has a spirolactone ring structure.
  • the leuco dye is preferably a leuco dye having a phthalide structure or a fluoran structure.
  • the leuco dye having a phthalide structure or a fluoran structure is preferably a compound represented by any of Formula (Le-1) to Formula (Le-3), and more preferably a compound represented by Formula (Le-2).
  • ERG's each independently represent an electron-donating group
  • X 1 to X 4 each independently represent a hydrogen atom, a halogen atom, or dialkylanilino group
  • X 5 to X 10 each independently represent a hydrogen atom, a halogen atom, or a monovalent organic group
  • Y 1 and Y 2 each independently represent C or N
  • X 1 does not exist in a case where Y 1 is N
  • X 4 does not exist in a case where Y 2 is N
  • Ra 1 represents a hydrogen atom, an alkyl group, or an alkoxy group
  • Rb 1 to Rb 4 each independently represent a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group.
  • the electron-donating group represented by ERG in Formula (Le-1) to Formula (Le-3) is preferably an amino group, an alkylamino group, an arylamino group, a heteroarylamino group, a dialkylamino group, a monoalkyl monoarylamino group, a monoalkyl monoheteroarylamino group, a diarylamino group, a diheteroarylamino group, a monoaryl monoheteroarylamino group, an alkoxy group, an aryloxy group, a heteroaryloxy group, or an alkyl group, more preferably an amino group, an alkylamino group, an arylamino group, a heteroarylamino group, a dialkylamino group, a monoalkyl monoarylamino group, a monoalkyl monoheteroarylamino group, a diarylamino group, a diheteroarylamino group, a monoalkyl monohetero
  • the electron-donating group represented by ERG is preferably a disubstituted amino group having an aryl group that has a substituent on at least one ortho position or a heteroaryl group that has a substituent on at least one ortho position, more preferably a disubstituted amino group having a phenyl group having a substituent on at least one ortho position and an electron-donating group at a para position, even more preferably an amino group having a phenyl group having a substituent on at least one ortho position and an electron-donating group at a para position, and an aryl group or a heteroaryl group, and particularly preferably an amino group having a phenyl group having a substituent on at least one ortho position and an electron-donating group at a para position, and an aryl group having an electron-donating group or a heteroaryl group having an electron-donating group.
  • a bonding position of an aryl group or a heteroaryl group with other structures is defined as position 1
  • the ortho position in the aryl group or heteroaryl group other than a phenyl group is called a bonding position (for example, position 2 or the like) adjacent to the position 1.
  • the electron-donating group that the aryl group or heteroaryl group has is preferably an amino group, an alkylamino group, an arylamino group, a heteroarylamino group, a dialkylamino group, a monoalkyl monoarylamino group, a monoalkyl monoheteroarylamino group, a diarylamino group, a diheteroarylamino group, a monoaryl monoheteroarylamino group, an alkoxy group, an aryloxy group, a heteroaryloxy group, or an alkyl group, more preferably an alkoxy group, an aryloxy group, a heteroaryloxy group, or an alkyl group, and particularly preferably an alkoxy group.
  • X 1 to X 4 in Formula (Le-1) to Formula (Le-3) each independently are preferably a hydrogen atom or a chlorine atom, and more preferably each independently represent a hydrogen atom.
  • X 5 to X 10 in Formula (Le-2) or Formula (Le-3) each independently are preferably a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an amino group, an alkylamino group, an arylamino group, a heteroarylamino group, a dialkylamino group, a monoalkyl monoarylamino group, a monoalkyl monoheteroarylamino group, a diarylamino group, a diheteroarylamino group, a monoaryl monoheteroarylamino group, a hydroxy group, an alkoxy group, an aryloxy group, a heteroaryloxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heteroaryloxycarbonyl group, or a cyano group, more preferably a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an amino
  • At least one of Y 1 or Y 2 in Formula (Le-1) to Formula (Le-3) be C, and it is more preferable that both of Y 1 and Y 2 be C.
  • Ra 1 in Formula (Le-1) to Formula (Le-3) is preferably an alkyl group or an alkoxy group, more preferably an alkoxy group, and particularly preferably a methoxy group.
  • Rb 1 to Rb 4 in Formula (Le-1) to Formula (Le-3) each independently are preferably a hydrogen atom or an alkyl group, more preferably an alkyl group, and particularly preferably a methyl group.
  • the leuco dye having a phthalide structure or a fluoran structure is more preferably a compound represented by any of Formula (Le-4) to Formula (Le-6), and even more preferably a compound represented by Formula (Le-5).
  • ERG's each independently represent an electron-donating group
  • X 1 to X 4 each independently represent a hydrogen atom, a halogen atom, or a dialkylanilino group
  • Y 1 and Y 2 each independently represent C or N
  • X 1 does not exist in a case where Y 1 is N
  • X 4 does not exist in a case where Y 2 is N
  • Ra 1 represents a hydrogen atom, an alkyl group, or an alkoxy group
  • Rb 1 to Rb 4 each independently represent a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group.
  • ERG, X 1 to X 4 , Y 1 , Y 2 , Ra 1, and Rb 1 to Rb 4 in Formula (Le-4) to Formula (Le-6) have the same definitions as ERG, X 1 to X 4 , Y 1 , Y 2 , Ra 1 , and Rb 1 to Rb 4 in Formula (Le-1) to Formula (Le-3) respectively, and preferred aspects thereof are also the same.
  • the leuco dye having a phthalide structure or a fluoran structure is even more preferably a compound represented by any of Formula (Le-7) to Formula (Le-9), and particularly preferably a compound represented by Formula (Le-8).
  • X 1 to X 4 each independently represent a hydrogen atom, a halogen atom, or a dialkylanilino group
  • Y 1 and Y 2 each independently represent C or N
  • X 1 does not exist in a case where Y 1 is N
  • X 4 does not exist in a case where Y 2 is N
  • Ra 1 to Ra 4 each independently represent a hydrogen atom, an alkyl group, or an alkoxy group
  • Rb 1 to Rb 4 each independently represent a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group
  • Rc 1 and Rc 2 each independently represent an aryl group or a heteroaryl group.
  • X 1 to X 4 , Y 1 , and Y 2 in Formula (Le-7) to Formula (Le-9) have the same definition as X 1 to X 4 , Y 1 , and Y 2 in Formula (Le-1) to Formula (Le-3) respectively, and preferred aspects thereof are also the same.
  • Ra 1 to Ra 4 in Formula (Le-7) or Formula (Le-9) each independently are preferably an alkyl group or an alkoxy group, more preferably an alkoxy group, and particularly preferably represent a methoxy group.
  • Rb 1 to Rb 4 in Formula (Le-7) to Formula (Le-9) each independently are preferably a hydrogen atom, an alkyl group, or an aryl group substituted with an alkoxy group, more preferably an alkyl group, and particularly preferably a methyl group.
  • Rc 1 and R c2 in Formula (Le-8) each independently are preferably a phenyl group or an alkylphenyl group, and more preferably a phenyl group.
  • Rc 1 and R c2 in Formula (Le-8) each independently are preferably an aryl group having a substituent on at least one ortho position or a heteroaryl group having a substituent on at least one ortho position, more preferably an aryl group having a substituent on at least one ortho position, even more preferably a phenyl group having a substituent on at least one ortho position, and particularly preferably a phenyl group having a substituent on at least one ortho position and having an electron-donating group at the para position.
  • substituent in Rc 1 and Rc 2 include substituents that will be described later.
  • X 1 to X 4 are a hydrogen atom, and Y 1 and Y 2 are C.
  • Rb 1 and Rb 2 each independently are preferably an alkyl group or an aryl group substituted with an alkoxy group.
  • Rb 1 and Rb 2 each independently are preferably an aryl group or a heteroaryl group, more preferably an aryl group, even more preferably an aryl group having an electron-donating group, and particularly preferably a phenyl group having an electron-donating group at the para position.
  • the electron-donating group in Rb 1 , Rb 2 , Rc 1 , and Rc 2 is preferably an amino group, an alkylamino group, an arylamino group, a heteroarylamino group, a dialkylamino group, a monoalkyl monoarylamino group, a monoalkyl monoheteroarylamino group, a diarylamino group, a diheteroarylamino group, a monoaryl monoheteroarylamino group, an alkoxy group, an aryloxy group, a heteroaryloxy group, or an alkyl group, more preferably an alkoxy group, an aryloxy group, a heteroaryloxy group, or an alkyl group, and particularly preferably an alkoxy group.
  • the acid color forming agent preferably includes a compound represented by Formula (3a) or Formula (3b), and more preferably includes a compound represented by Formula (3a).
  • Ar 1 and Ar 2 each independently represent an aryl group or a heteroaryl group
  • R 10 and R 11 each independently represent a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group.
  • ERG's each independently represent an electron-donating group
  • n represents an integer of 1 to 5
  • X 1 to X 4 each independently represent a hydrogen atom, a halogen atom, or a monovalent organic group
  • Y 1 and Y 2 each independently represent C or N
  • X 1 does not exist in a case where Y 1 is N
  • X 4 does not exist in a case where Y 2 is N
  • R 12 and R 13 each independently represent a hydrogen atom, an alkyl group, an aryl group, or a heteroaryl group.
  • R 10 and R 11 in Formula (3a) have the same definition as Rb 1 and Rb 2 in Formula (Le-7) to Formula (Le-9) respectively, and preferred aspects thereof are also the same.
  • Ar 1 and Ar 2 in Formula (3a) have the same definition as Rc 1 and R c2 in Formula (Le-7) to Formula (Le-9) respectively, and preferred aspects thereof are also the same.
  • ERG, X 1 to X 4 , Y 1 , and Y 2 in Formula (3b) have the same definition as ERG, X 1 to X 4 , Y 1 , and Y 2 in Formula (Le-1) to Formula (Le-3) respectively, and preferred aspects thereof are also the same.
  • R 12 and R 13 in Formula (3b) have the same definition as Rb 2 and Rb 4 in Formula (Le-1) respectively, and preferred aspects thereof are also the same.
  • n in Formula (3b) is preferably an integer of 1 to 3, and more preferably 1 or 2.
  • the alkyl group in Formula (Le-1) to Formula (Le-9), Formula (3a), or Formula (3b) may be linear or branched, or may have a ring structure.
  • the number of carbon atoms in the alkyl group in Formula (Le-1) to Formula (Le-9), Formula (3a), or Formula (3b) is preferably 1 to 20, more preferably 1 to 8, even more preferably 1 to 4, and particularly preferably 1 or 2.
  • the number of carbon atoms in the aryl group in Formula (Le-1) to Formula (Le-9), Formula (3a), or Formula (3b) is preferably 6 to 20, more preferably 6 to 10, and particularly preferably 6 to 8.
  • aryl group in Formula (Le-1) to Formula (Le-9), Formula (3a), or Formula (3b) include a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, and the like, which may have a substituent.
  • heteroaryl group in Formula (Le-1) to Formula (Le-9), Formula (3a), or Formula (3b) include a furyl group, a pyridyl group, a pyrimidyl group, a pyrazole group, a thiophenyl group, and the like, which may have a substituent.
  • substituents examples include an alkyl group, an aryl group, a heteroaryl group, a halogen atom, an amino group, an alkylamino group, an arylamino group, a heteroarylamino group, a dialkylamino group, a monoalkyl monoarylamino group, a monoalkyl monoheteroarylamino group, a diarylamino group, a diheteroarylamino group, a monoaryl monoheteroarylamino group, a hydroxy group, an alkoxy group, an aryloxy group, a heteroaryloxy group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heteroaryloxycarbonyl group, a cyano group, and the like. In addition, these substituents may be further substituted with these substituents.
  • Examples of the acid color forming agent to be suitably used include the following compounds. Me represents a methyl group, Et represents an ethyl group, Oct represents an octyl group, and Ph represents a phenyl group.
  • the acid color forming agent a commercially available product can be used, and examples thereof include ETAC, RED500, RED520, CVL, S-205, BLACK305, BLACK400, BLACK100, BLACK500, H-7001, GREEN300, NIRBLACK78, BLUE220, H-3035, BLUE203, ATP, H-1046, and H-2114 (all manufactured by Fukui Yamada Chemical Co., Ltd.), ORANGE-DCF, Vermilion-DCF, PINK-DCF, RED-DCF, BLMB, CVL, GREEN-DCF, and TH-107 (all manufactured by HODOGAYA CHEMICAL CO.,LTD.), ODB, ODB-2, ODB-4, ODB-250, ODB-BlackXV, Blue-63, Blue-502, GN-169, GN-2, Green-118, Red-40, and Red-8 (all manufactured by Yamamoto Chemicals Inc.), and Crystal Violet Lactone (manufactured by Tokyo Chemical Industry Co., Ltd.
  • ETAC, S-205, BLACK305, BLACK400, BLACK100, BLACK500, H-7001, GREEN300, NIRBLACK78, H-3035, ATP, H-1046, H-2114, GREEN-DCF, Blue-63, GN-169, and crystal violet lactone are preferable because these form a film having excellent visible light absorbance.
  • a molar absorption coefficient ⁇ of a color forming substance generated from the acid color forming agent is preferably 35,000 or more, more preferably 35,000 or more and 200,000 or less, and particularly preferably 50,000 or more and 150,000 or less.
  • the molar absorption coefficient ⁇ of the color forming substance generated from the acid color forming agent is measured by the following method.
  • acetic acid is added thereto such that the volume increases up to 100 mL, thereby preparing a dye solution A.
  • acetic acid About 80 mL of acetic acid is added to another 100 mL volumetric flask, then 5 mL of deionized water and 5 mL of the dye solution A are added thereto by using a 5 mL transfer pipette, and the solution is gently shaken to mix.
  • acetic acid is added thereto such that the volume increases up to 100 mL, thereby preparing a dye solution B.
  • the concentration of the acid color forming agent is 0.02 mmol/L.
  • a measurement cell (quartz glass, optical path width: 10 mm) is filled with the dye solution B, and the solution is measured using an ultraviolet-visible spectrophotometer (UV-1800, manufactured by Shimadzu Corporation.).
  • UV-1800 ultraviolet-visible spectrophotometer
  • the maximal absorption wavelength in the visible light region (380 nm to 750 nm) is read. From the absorbance at the wavelength, the molar absorption coefficient ⁇ is calculated.
  • a ring-opening rate of the acid color forming agent calculated by the following equation is preferably 15% or more and 100% or less, more preferably 40% or more and 99% or less, even more preferably 60% or more and 99% or less, particularly preferably 75% or more and 99% or less, and most preferably 85% or more and 99% or less.
  • Ring ⁇ opening rate a molar absorption coefficient in a case where 1 molar equivalent of an acid is added to the acid color forming agent / a molar absorption coefficient ⁇ of a color forming substance generated from the acid color forming agent ⁇ 100 .
  • the maximum absorption wavelength ⁇ max of the color forming substance generated from the acid color forming agent is preferably 500 nm to 650 nm, more preferably 520 nm to 600 nm, even more preferably 530 nm to 580 nm, and particularly preferably 540 nm to 570 nm.
  • the ring-opening rate and ⁇ max are measured by the following methods.
  • acetonitrile is added thereto such that the volume increases up to 50 mL, thereby preparing a dye solution C.
  • CSA 10-camphorsulfonic acid
  • the concentration of the acid color forming agent including the generated color forming substance is 0.02 mmol/L.
  • a measurement cell (quartz glass, optical path width: 10 mm) is filled with the measurement solution E, and the solution is measured using an ultraviolet-visible spectrophotometer (UV-1800, manufactured by Shimadzu Corporation.).
  • UV-1800 ultraviolet-visible spectrophotometer
  • the maximal absorption wavelength ⁇ max in the visible light region (380 nm to 750 nm) is read. From the absorbance at the wavelength, the molar absorption coefficient ⁇ is calculated.
  • the ring-opening rate is calculated according to the equation described above.
  • a molar absorption coefficient ⁇ of the color forming substance generated from the acid color forming agent is 35,000 or more, a ring-opening rate of the acid color forming agent is 40 mol% to 99 mol%, and a maximum absorption wavelength of the color forming substance generated from the acid color forming agent is 500 nm to 650 nm in a wavelength range of 380 nm to 750 nm.
  • Each of these acid color forming agents may be used alone. Alternatively, two or more components can be used in combination.
  • the content of the acid color forming agent with respect to the total mass of the image-recording layer is preferably 0.5% by mass to 10% by mass and more preferably 1% by mass to 5% by mass.
  • the image-recording layer contain a polymerizable compound.
  • the polymerizable compound refers to a compound having a polymerizable group.
  • the polymerizable group is not particularly limited, may be a known polymerizable group, and is preferably an ethylenically unsaturated group.
  • the polymerizable group may be a radically polymerizable group or a cationically polymerizable group, and is preferably a radically polymerizable group.
  • Examples of the radically polymerizable group include a (meth)acryloyl group, an allyl group, a vinylphenyl group, a vinyl group, and the like. From the viewpoint of reactivity, a (meth)acryloyl group is preferable.
  • the molecular weight of the polymerizable compound (weight-average molecular weight in a case where the polymerizable compound has molecular weight distribution) is preferably 50 or more and less than 2,500.
  • the polymerizable compound used in the present disclosure may be, for example, a radically polymerizable compound or a cationically polymerizable compound, and is preferably an addition polymerizable compound having at least one ethylenically unsaturated bond (ethylenically unsaturated compound).
  • the ethylenically unsaturated compound is preferably a compound having at least one terminal ethylenically unsaturated bond, and more preferably a compound having two or more terminal ethylenically unsaturated bonds.
  • the chemical form of the polymerizable compound is, for example, a monomer, a prepolymer which is in other words a dimer, a trimer, or an oligomer, a mixture of these, or the like.
  • the polymerizable compound preferably includes a polymerizable compound having functionalities of 3 or more, more preferably includes a polymerizable compound having functionalities of 7 or more, and even more preferably includes a polymerizable compound having functionalities of 10 or more.
  • the polymerizable compound preferably includes an ethylenically unsaturated compound having functionalities of 3 or more (preferably having functionalities of 7 or more and more preferably having functionalities of 10 or more), and more preferably includes a (meth)acrylate compound having functionalities of 3 or more (preferably having functionalities of 7 or more and more preferably having functionalities of 10 or more).
  • the polymerizable compound preferably includes a polymerizable compound having functionalities of 2 or less, more preferably includes a difunctional polymerizable compound, and particularly preferably includes a difunctional (meth)acrylate compound.
  • the content of the polymerizable compound having functionalities of 2 or less (preferably a difunctional polymerizable compound) with respect to the total mass of polymerizable compounds in the image-recording layer is preferably 5% by mass to 100% by mass, more preferably 10% by mass to 100% by mass, and even more preferably 15% by mass to 100% by mass.
  • oligomer a polymerizable compound which is an oligomer (hereinafter, also simply called “oligomer”) is preferable.
  • an oligomer represents a polymerizable compound which has a molecular weight (weight-average molecular weight in a case where the compound has molecular weight distribution) of 600 or more and 40,000 or less and contains at least one polymerizable group.
  • the molecular weight of the oligomer is preferably 1,000 or more and 25,000 or less.
  • the number of polymerizable groups in one molecule of the oligomer is preferably 2 or more, more preferably 3 or more, even more preferably 6 or more, and particularly preferably 10 or more.
  • the upper limit of the number of polymerizable groups in the oligomer is not particularly limited, but the number of polymerizable groups is preferably 20 or less.
  • an oligomer having 7 or more polymerizable groups and a molecular weight of 1,000 or more and 40,000 or less is preferable, and an oligomer having 7 or more and 20 or less polymerizable groups and a molecular weight of 1,000 or more and 25,000 or less is more preferable.
  • the image-recording layer may contain a polymer component which may be generated in the process of manufacturing the oligomer.
  • the oligomer preferably has at least one selected from the group consisting of a compound having a urethane bond, a compound having an ester bond, and a compound having an epoxy residue, and more preferably has a compound having a urethane bond.
  • an epoxy residue refers to a structure formed of an epoxy group and for example, means a structure similar to a structure obtained by the reaction between an acid group (carboxylic acid group or the like) and an epoxy group.
  • a compound may also be used which is prepared by obtaining polyurethane by a reaction between a polyisocyanate compound and a polyol compound and introducing a polymerizable group into the obtained polyurethane by a polymer reaction.
  • the compound having a urethane bond may be obtained by reacting a polyol compound having an acid group with a polyisocyanate compound to obtain a polyurethane oligomer and reacting the obtained polyurethane oligomer with a compound having an epoxy group and a polymerizable group.
  • the number of polymerizable groups in the compound having an ester bond is preferably 3 or more, and more preferably 6 or more.
  • a compound containing a hydroxy group is preferable.
  • the number of polymerizable groups in the compound having an epoxy residue is preferably 2 to 6, and more preferably 2 or 3.
  • the compound having an epoxy residue can be obtained, for example, by reacting a compound having an epoxy group with an acrylic acid.
  • oligomer commercially available products may also be used. Examples thereof include UA-510H, UA-306H, UA-306I, and UA-306T (all manufactured by KYOEISHA CHEMICAL Co., Ltd.), UV-1700B, UV-6300B, and UV7620EA (all manufactured by The Nippon Synthetic Chemical Industry Co., Ltd.), U-15HA (manufactured by SHIN-NAKAMURA CHEMICAL Co., Ltd.), EBECRYL450, EBECRYL657, EBECRYL885, EBECRYL800, EBECRYL3416, and EBECRYL860 (all manufactured by DAICEL-ALLNEX LTD.), and the like. However, the oligomer is not limited to these.
  • the content of the oligomer with respect to the total mass of polymerizable compounds in the image-recording layer is preferably 30% by mass to 100% by mass, more preferably 50% by mass to 100% by mass, and even more preferably 80% by mass to 100% by mass.
  • the polymerizable compound may further include a polymerizable compound other than the oligomer described above.
  • the polymerizable compound other than the oligomer is preferably a low-molecular-weight polymerizable compound.
  • the low-molecular-weight polymerizable compound may take a chemical form such as a monomer, a dimer, a trimer, or a mixture of these.
  • the low-molecular-weight polymerizable compound is preferably at least one polymerizable compound selected from the group consisting of a polymerizable compound having three or more ethylenically unsaturated groups and a polymerizable compound having an isocyanuric ring structure.
  • a low-molecular-weight polymerizable compound refers to a polymerizable compound having a molecular weight (weight-average molecular weight in a case where the compound has molecular weight distribution) of 50 or more and less than 800.
  • the molecular weight of the low-molecular-weight polymerizable compound is preferably 100 or more and less than 800, more preferably 300 or more and less than 800, and even more preferably 400 or more and less than 800.
  • the ratio (oligomer/low-molecular-weight polymerizable compound) of the oligomer to the low-molecular-weight polymerizable compound (total amount in a case where the polymerizable compound includes two or more low-molecular-weight polymerizable compounds) based on mass is preferably 10/1 to 1/10, more preferably 10/1 to 3/7, and even more preferably 10/1 to 7/3.
  • the polymerizable compounds described in paragraphs "0082” to “0086” of WO2019/013268A can also be suitably used.
  • the details of how to use the polymerizable compound such as the structure of the compound, whether the compound is used alone or used in combination with other compounds, and the amount of the compound to be added, can be optionally set.
  • the image-recording layer preferably contains two or more polymerizable compounds.
  • the content of the polymerizable compound (total content of polymerizable compounds in a case where the image-recording layer contains two or more polymerizable compounds) with respect to the total mass of the image-recording layer is preferably 5% by mass to 75% by mass, more preferably 10% by mass to 70% by mass, and even more preferably 15% by mass to 60% by mass.
  • the image-recording layer preferably contains particles.
  • the particles may be organic particles or inorganic particles.
  • the image-recording layer preferably contains organic particles, and more preferably contains polymer particles.
  • inorganic particles known inorganic particles can be used, and metal oxide particles such as silica particles and titania particles can be suitably used.
  • the polymer particles are preferably selected from the group consisting of thermoplastic resin particles, thermal reactive resin particles, polymer particles having a polymerizable group, microcapsules encapsulating a hydrophobic compound, and a microgel (crosslinked polymer particles).
  • polymer particles having a polymerizable group or a microgel are preferable.
  • the polymer particles have at least one ethylenically unsaturated group. The presence of such polymer particles brings about effects of improving the printing durability of an exposed portion and improving the on-press developability of a non-exposed portion.
  • the polymer particles are preferably thermoplastic resin particles.
  • thermoplastic resin particles are preferably the thermoplastic polymer particles described in Research Disclosure No. 33303 published in January 1992 , JP1997-123387A ( JP-H09-123387A ), JP1997-131850A ( JP-H09-131850A ), JP1997-171249A ( JP-H09-171249A ), JP1997-171250A ( JP-H09-171250A ), EP931647B , and the like.
  • thermoplastic resin particles include homopolymers or copolymers of monomers of ethylene, styrene, vinyl chloride, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, vinylidene chloride, acrylonitrile, vinylcarbazole, acrylate or methacrylate having a polyalkylene structure, and the like and mixtures of these.
  • Preferred examples thereof can include polystyrene, copolymers having styrene and acrylonitrile, or polymethyl methacrylate.
  • the average particle diameter of the thermoplastic resin particle is preferably 0.01 ⁇ m to 3.0 ⁇ m.
  • thermal reactive resin particles examples include polymer particles having a thermal reactive group.
  • the thermal reactive polymer particles form a hydrophobilized region through crosslinking by a thermal reaction and the accompanying change in functional groups.
  • the thermal reactive group in the polymer particles having a thermal reactive group may be a functional group that causes any reaction as long as chemical bonds are formed, and is preferably a polymerizable group.
  • Preferred examples thereof include an ethylenically unsaturated group that causes a radical polymerization reaction (for example, an acryloyl group, a methacryloyl group, a vinyl group, an allyl groups, and the like), a cationically polymerizable group (for example, a vinyl group, a vinyloxy group, an epoxy group, an oxetanyl group, and the like), an isocyanato group or a blocked isocyanato group that causes an addition reaction, an epoxy group, a vinyloxy group, an active hydrogen atom-containing functional group that is a reaction partner thereof (for example, an amino group, a hydroxy group, a carboxy group, and the like), a carboxy group that causes a condensation reaction, a hydroxy group or an amino group that is a reaction partner
  • microcapsules examples include microcapsules encapsulating at least some of the constituent components of the image-recording layer as described in JP2001-277740A and JP2001-277742A .
  • the constituent components of the image-recording layer can also be contained in the exterior of the microcapsules.
  • the image-recording layer containing microcapsules is constituted such that hydrophobic constituent components are encapsulated in the microcapsules and hydrophilic constituent components are contained in the exterior of the microcapsules.
  • the microgel can contain some of the constituent components of the image-recording layer, in at least one of the surface or the interior of the microgel. From the viewpoints of sensitivity of the lithographic printing plate precursor to be obtained and printing durability of the lithographic printing plate to be obtained, a reactive microgel having a radically polymerizable group on the surface thereof is particularly preferable.
  • the polymer particles are preferably polymer particle which are obtained by a reaction of a polyvalent isocyanate compound that is an adduct of a polyhydric phenol compound having two or more hydroxy groups in a molecule and isophorone diisocyanate with a compound having active hydrogen.
  • the polyhydric phenol compound is preferably a compound having a plurality of benzene rings having a phenolic hydroxy group.
  • the compound having active hydrogen is preferably a polyol compound or a polyamine compound, more preferably a polyol compound, and even more preferably at least one compound selected from the group consisting of propylene glycol, glycerin, and trimethylolpropane.
  • Preferred examples of the resin particles obtained by the reaction of a polyvalent isocyanate compound that is an adduct of a polyhydric phenol compound having two or more hydroxy groups in a molecule and isophorone diisocyanate, with a compound having active hydrogen include the polymer particles described in paragraphs "0032" to "0095" of JP2012-206495A .
  • the polymer particles preferably include polymer particles containing a polymer having both i: a constitutional unit having a pendant cyano group directly bonded to the hydrophobic main chain and ii: a constitutional unit having a pendant group including a hydrophilic poly(alkylene oxide) segment.
  • Preferred examples of the hydrophobic main chain include an acrylic resin chain.
  • Preferred examples of the pendant cyano group include -[CH 2 CH(C ⁇ N)]- or -[CH 2 C(CH 3 )(C ⁇ N)]-.
  • constitutional unit having the pendant cyano group can be easily derived from an ethylenically unsaturated monomer, for example, acrylonitrile or methacrylonitrile, or a combination of these.
  • alkylene oxide in the hydrophilic polyalkylene oxide segment ethylene oxide or a propylene oxide is preferable, and ethylene oxide is more preferable.
  • the number of repeating alkylene oxide structures in the hydrophilic polyalkylene oxide segment is preferably 10 to 100, more preferably 25 to 75, and even more preferably 40 to 50.
  • Preferred examples of the resin particles including both i: the constitutional unit having the pendant cyano group directly bonded to the hydrophobic main chain and ii: the constitutional unit having the pendant group including the hydrophilic polyalkylene oxide segment include the particles described in paragraphs "0039" to "0068" of JP2008-503365A .
  • the polymer particles preferably have a hydrophilic group.
  • the hydrophilic group is not particularly limited as long as it has a hydrophilic structure, and examples thereof include an acid group such as a carboxy group, a hydroxy group, an amino group, a cyano group, a polyalkylene oxide structure, and the like.
  • a polyalkylene oxide structure is preferable, and a polyethylene oxide structure, a polypropylene oxide structure, or a polyethylene/propylene oxide structure is more preferable.
  • the polyalkylene oxide structure preferably has a polypropylene oxide structure, and more preferably has a polyethylene oxide structure and a polypropylene oxide structure.
  • the hydrophilic group preferably has a constitutional unit having a cyano group, or a group represented by Formula Z, more preferably has a constitutional unit represented by Formula (AN) or a group represented by Formula Z, and particularly preferably has a group represented by Formula Z.
  • Q represents a divalent linking group
  • W represents a divalent group having a hydrophilic structure or a divalent group having a hydrophobic structure
  • Y represents a monovalent group having a hydrophilic structure or a monovalent group having a hydrophobic structure, either W or Y has a hydrophilic structure
  • * represents a bonding site with another structure.
  • R AN represents a hydrogen atom or a methyl group.
  • the polymer contained in the polymer particles preferably has a constitutional unit formed of a compound having a cyano group.
  • a cyano group is introduced as a constitutional unit having a cyano group into a resin by using a compound (monomer) having a cyano group.
  • a compound (monomer) having a cyano group examples include acrylonitrile compounds and suitable examples thereof include (meth)acrylonitrile.
  • the constitutional unit having a cyano group is preferably a constitutional unit formed of an acrylonitrile compound, and more preferably a constitutional unit formed of (meth)acrylonitrile, that is, a constitutional unit represented by Formula (AN).
  • the content of the constitutional unit having a cyano group which is preferably a constitutional unit represented by Formula (AN) in the polymer having the constitutional unit having a cyano group with respect to the total mass of the polymer having the constitutional unit having a cyano group is preferably 5% by mass to 90% by mass, more preferably 20% by mass to 80% by mass, and particularly preferably 30% by mass to 60% by mass.
  • the polymer particles preferably include polymer particles having a group represented by Formula Z.
  • Q in Formula Z is preferably a divalent linking group having 1 to 20 carbon atoms, and more preferably a divalent linking group having 1 to 10 carbon atoms.
  • Q in Formula Z is preferably an alkylene group, an arylene group, an ester bond, an amide bond, or a group formed by combining two or more of these, and more preferably a phenylene group, an ester bond, or an amide bond.
  • the divalent group having a hydrophilic structure represented by W in Formula Z is preferably a polyalkyleneoxy group or a group in which -CH 2 CH 2 NR W - is bonded to one terminal of a polyalkyleneoxy group.
  • R W represents a hydrogen atom or an alkyl group.
  • R WA 's each independently represent a linear, branched, or cyclic alkylene group having 6 to 120 carbon atoms, a haloalkylene group having 6 to 120 carbon atoms, an arylene group having 6 to 120 carbon atoms, an alkarylene group having 7 to 120 carbon atoms (divalent group formed by removing one hydrogen atom from an alkylaryl group), or an aralkylene group having 7 to 120 carbon atoms.
  • R WB represents an alkyl group having 6 to 20 carbon atoms.
  • W is preferably a divalent group having a hydrophilic structure, and it is more preferable that Q is a phenylene group, an ester bond, or an amide bond, W is a polyalkyleneoxy group, and Y is a polyalkyleneoxy group having a hydrogen atom or an alkyl group on a terminal.
  • the polymer particles preferably include polymer particles having a polymerizable group, and more preferably include polymer particles having a polymerizable group on the particle surface.
  • the polymer particles preferably include polymer particles having a hydrophilic group and a polymerizable group.
  • the polymerizable group may be a cationically polymerizable group or a radically polymerizable group and, from the viewpoint of reactivity, is preferably a radically polymerizable group.
  • the polymerizable group is not particularly limited as long as it is a polymerizable group, but from the viewpoint of reactivity, is preferably an ethylenically unsaturated group, more preferably a vinylphenyl group (styryl group), a (meth)acryloxy group, or a (meth)acrylamide group, and particularly preferably a (meth)acryloxy group.
  • the polymer in the polymer particles having a polymerizable group preferably has a constitutional unit having a polymerizable group.
  • the polymerizable group may be introduced into the surface of the polymer particles by a polymer reaction.
  • the image-recording layer preferably contains, as the polymer particles, addition polymerization-type resin particles having a dispersible group which more preferably includes a group represented by Formula Z.
  • the polymer particles preferably contain a resin having a urea bond.
  • Suitable examples of the resin having a urea bond include those described in WO2020/262692A .
  • the image-recording layer preferably contains thermoplastic resin particles.
  • thermoplastic resin contained in the thermoplastic resin particles is not particularly limited, and examples thereof include polyethylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polymethyl (meth)acrylate, polyethyl (meth)acrylate, polybutyl (meth)acrylate, polyacrylonitrile, polyvinyl acetate, copolymers of these, and the like.
  • the thermoplastic resin may be in the state of latex.
  • thermoplastic resin according to the present disclosure is preferably a resin which melts or softens by heat generated in an exposure step that will be described later and thus forms a part or the entirety of a hydrophobic film forming the image-recording layer.
  • the thermoplastic resin preferably contains a resin having a constitutional unit formed of an aromatic vinyl compound and a constitutional unit having a cyano group.
  • Suitable examples of the resin having a constitutional unit formed of an aromatic vinyl compound and a constitutional unit having a cyano group include those described in WO2020/262692A .
  • thermoplastic resin contained in the thermoplastic resin particles preferably has a hydrophilic group.
  • the hydrophilic group is not particularly limited as long as it has a hydrophilic structure, and examples thereof include an acid group such as a carboxy group, a hydroxy group, an amino group, a cyano group, a polyalkylene oxide structure, and the like.
  • the hydrophilic group is preferably a group having a polyalkylene oxide structure, a group having a polyester structure, or a sulfonic acid group, more preferably a group having a polyalkylene oxide structure or a sulfonic acid group, and even more preferably a group having a polyalkylene oxide structure.
  • the polyalkylene oxide structure is preferably a polyethylene oxide structure, a polypropylene oxide structure, or a poly(ethylene oxide/propylene oxide) structure.
  • hydrophilic groups as a polyalkylene oxide structure, groups having a polypropylene oxide structure are preferable, and groups having a polyethylene oxide structure and a polypropylene oxide structure are more preferable.
  • the number of alkylene oxide structures in the polyalkylene oxide structure is preferably 2 or more, more preferably 5 or more, even more preferably 5 to 200, and particularly preferably 8 to 150.
  • the hydrophilic group is preferably a group represented by Formula Z.
  • the glass transition temperature (Tg) of the thermoplastic resin is preferably 60°C to 150°C, more preferably 80°C to 140°C, and even more preferably 90°C to 130°C.
  • thermoplastic resin particles contain two or more kinds of thermoplastic resins
  • the value obtained by the FOX equation that will be described later is referred to as the glass transition temperature of the thermoplastic resin.
  • the glass transition temperature of a resin can be measured by differential scanning calorimetry (DSC).
  • the glass transition temperature is measured according to the method described in JIS K 7121 (1987) or JIS K 6240 (2011).
  • an extrapolated glass transition initiation temperature (hereinafter, may be referred to as Tig) is used.
  • the device In a case of determining the glass transition temperature, the device is kept at a temperature approximately 50°C lower than the expected Tg of the resin until the device stabilizes. Then, the resin is heated at a heating rate of 20 °C/min to a temperature approximately 30°C higher than the temperature at which the glass transition ends, and a differential thermal analysis (DTA) curve or a DSC curve is created.
  • DTA differential thermal analysis
  • the extrapolated glass transition initiation temperature (Tig), that is, the glass transition temperature Tg in the present specification is determined as a temperature at an intersection point between a straight line that is obtained by extending the baseline of a low temperature side in the DTA curve or the DSC curve to a high temperature side and a tangent line that is drawn at a point where the slope of the curve of a portion in which the glass transition changes stepwisely is maximum.
  • thermoplastic resin particles contain two kinds of thermoplastic resins
  • Tg of the thermoplastic resin particles is determined as follows.
  • Tg1 (K) represents Tg of a first thermoplastic resin
  • W1 represents the mass ratio of the first thermoplastic resin to the total mass of thermoplastic resin components in the thermoplastic resin particles
  • Tg2 (K) represents Tg of a second thermoplastic resin
  • W2 represents the mass ratio of the second resin to the total mass of thermoplastic resin components in the thermoplastic resin particles
  • DSC differential scanning calorimeter
  • the arithmetic mean particle diameter of the thermoplastic resin particles is preferably 1 nm or more and 200 nm or less, more preferably 3 nm or more and less than 80 nm, and even more preferably 10 nm or more and 49 nm or less.
  • the arithmetic mean particle diameter of the thermoplastic resin particles in the present disclosure refers to a value measured by a dynamic light scattering method (DLS).
  • the measurement of the arithmetic mean particle diameter of the thermoplastic resin particles by DLS is carried out using Brookhaven BI-90 (manufactured by Brookhaven Instruments) according to the manual of the instrument.
  • the weight-average molecular weight of the thermoplastic resin contained in the thermoplastic resin particles is preferably 3,000 to 300,000, and more preferably 5,000 to 100,000.
  • thermoplastic resin contained in the thermoplastic resin particles is not particularly limited, and the thermoplastic resin can be manufactured by known methods.
  • the thermoplastic resin is obtained by polymerizing a styrene compound, an acrylonitrile compound, and at least one optional compound selected from the group consisting of an N-vinyl heterocyclic compound, a compound used for forming a constitutional unit having a ethylenically unsaturated group, a compound used for forming a constitutional unit having an acidic group, a compound used for forming a constitutional unit having a hydrophobic group, and a compound used for forming the other constitutional units, by known methods.
  • thermoplastic resin contained in the thermoplastic resin particles include those described in WO2020/262692A .
  • the average particle diameter of the particles is preferably 0.01 ⁇ m to 3.0 ⁇ m, more preferably 0.03 ⁇ m to 2.0 ⁇ m, and even more preferably 0.10 ⁇ m to 1.0 ⁇ m. In a case where the average particle diameter is in this range, excellent resolution and excellent temporal stability are obtained.
  • the average primary particle diameter of the particles in the present disclosure is obtained by measuring with a light scattering method or by imaging an electron micrograph of the particles, measuring the particle diameter of a total of 5,000 particles in the photograph, and calculating the average thereof.
  • the value of particle diameter of spherical particles having the same area as the area of the particles on the photograph is adopted as the particle diameter.
  • the average particle diameter in the present disclosure means a volume average particle diameter.
  • the image-recording layer may contain only one kind of particles, particularly, one kind of polymer particles or two or more kinds of polymer particles.
  • the content of particles, particularly, the content of polymer particles in the image-recording layer with respect to the total mass of the image-recording layer is preferably 5% by mass to 90% by mass, more preferably 10% by mass to 90% by mass, even more preferably 20% by mass to 90% by mass, and particularly preferably 50% by mass to 90% by mass.
  • the content of the polymer particles in the image-recording layer with respect to the total mass of components having a molecular weight of 3,000 or more in the image-recording layer is preferably 20% by mass to 100% by mass, more preferably 35% by mass to 100% by mass, even more preferably 50% by mass to 100% by mass, and particularly preferably 80% by mass to 100% by mass.
  • the image-recording layer may contain a binder polymer.
  • the above-described polymer particles do not correspond to the binder polymer. That is, the binder polymer is a polymer that is not in the form of particles.
  • the binder polymer is preferably a (meth)acrylic resin, a polyvinyl acetal resin, or a polyurethane resin.
  • binder polymer known binder polymers that can be used in an image-recording layer in lithographic printing plate precursors can be suitably used.
  • binder polymer that is used for an on-press development type lithographic printing plate precursor (hereinafter, also called binder polymer for on-press development) will be specifically described.
  • a binder polymer having an alkylene oxide chain is preferable.
  • the binder polymer having an alkylene oxide chain may have a poly(alkylene oxide) moiety in a main chain or side chain.
  • the binder polymer may be a graft polymer having poly(alkylene oxide) in a side chain or a block copolymer of a block composed of a poly(alkylene oxide)-containing repeating unit and a block composed of an (alkylene oxide)-free repeating unit.
  • a polyurethane resin is preferable.
  • examples of polymers include a (meth)acrylic resin, a polyvinyl acetal resin, a polyurethane resin, a polyurea resin, a polyimide resin, a polyamide resin, an epoxy resin, a polystyrene resin, a novolac-type phenol resin, a polyester resin, synthetic rubber, and natural rubber, and a (meth)acrylic resin is particularly preferable.
  • binder polymer examples include a polymer compound which has a polyfunctional thiol having functionalities of 6 or more and 10 or less as a nucleus and a polymer chain that is bonded to the nucleus by a sulfide bond and has a polymerizable group (hereinafter, this compound will be also called star-shaped polymer compound).
  • star-shaped polymer compound examples include a star-shaped polymer compound having a polymerizable group such as an ethylenically unsaturated group on a main chain or a side chain, and more preferably on a side chain.
  • star-shaped polymer compound examples include those described in JP2012-148555A or WO2020/262692A .
  • the molecular weight of the binder polymer that is a polystyrene-equivalent weight-average molecular weight (Mw) determined by GPC is preferably 2,000 or more, more preferably 5,000 or more, and even more preferably 10,000 to 300,000.
  • hydrophilic polymer such as polyacrylic acid or polyvinyl alcohol described in JP2008-195018A can be used in combination.
  • a lipophilic polymer and a hydrophilic polymer can be used in combination.
  • the image-recording layer preferably contains a polymer having a constitutional unit formed of an aromatic vinyl compound, and more preferably contains a polymer having a constitutional unit formed of an aromatic vinyl compound and an infrared absorber which decomposes by exposure to infrared.
  • the glass transition temperature (Tg) of the binder polymer used in the present disclosure is preferably 50°C or higher, more preferably 70°C or higher, even more preferably 80°C or higher, and particularly preferably 90°C or higher.
  • the upper limit of the glass transition temperature of the binder polymer is preferably 200°C, and more preferably 120°C or lower.
  • the binder polymer having the above-described glass transition temperature is preferably polyvinyl acetal.
  • Polyvinyl acetal is a resin obtained by acetalizing a hydroxy group of polyvinyl alcohol with an aldehyde.
  • polyvinyl butyral is preferable which is obtained by acetalizing (that is, butyralizing) a hydroxy group of polyvinyl alcohol with butyraldehyde.
  • the polyvinyl acetal preferably has an ethylenically unsaturated group.
  • Suitable examples of the polyvinyl acetal include those described in WO2020/262692A .
  • the image-recording layer in the present disclosure preferably contains a resin having a fluorine atom, and more preferably contains a fluoroaliphatic group-containing copolymer.
  • the resin having a fluorine atom, particularly, the fluoroaliphatic group-containing copolymer it is possible to inhibit surface abnormalities resulting from foaming during the formation of the image-recording layer and to improve the condition of the coated surface, and further to improve the ink receptivity of the formed image-recording layer.
  • the image-recording layer containing the fluoroaliphatic group-containing copolymer has high gradation and is highly sensitive, for example, to laser light. Therefore, the obtained lithographic printing plate exhibits excellent fogging property by scattered light, reflected light, and the like and has excellent printing durability.
  • fluoroaliphatic group-containing copolymer those described in WO2020/262692A can be suitably used.
  • one binder polymer may be used alone, or two or more binder polymers may be used in combination.
  • the content of the binder polymer to be contained in the image-recording layer can be optionally set, and the content of the binder polymer with respect to the total mass of the image-recording layer is preferably 1% by mass to 90% by mass and more preferably 5% by mass to 80% by mass.
  • the image-recording layer preferably contains a polymerization inhibitor.
  • the polymerizable compound particularly, the radically polymerizable compound can be prevented from undergoing unnecessary thermal polymerization.
  • suitable examples of the polymerization inhibitor include hydroquinone, p-methoxyphenol, di-t-butyl-p-cresol, pyrogallol, t-butylcatechol, benzoquinone, 4,4'-thiobis(3-methyl-6-t-butylphenol), 2,2'-methylenebis(4-methyl-6-t-butylphenol), a N-nitroso-N-phenylhydroxylamine aluminum salt, and the like.
  • the polymerization inhibitor preferably includes a compound represented by Formula (Ph).
  • X P represents O, S, or NH
  • Y P represents N or CH
  • R P1 represents a hydrogen atom or an alkyl group
  • R P2 and R P3 each independently represent a halogen atom, an alkylthio group, an arylthio group, an alkoxy group, an aryloxy group, an alkyl group, an aryl group, an acylthio group, or an acyl group
  • mp and np each independently represent an integer of 0 to 4.
  • X P in Formula (Ph) is preferably O or S and more preferably S.
  • Y P in Formula (Ph) is preferably N.
  • R P1 in Formula (Ph) is preferably a hydrogen atom or a methyl group and more preferably a hydrogen atom.
  • R P2 and R P3 in Formula (Ph) each independently are preferably a halogen atom, an alkylthio group, an arylthio group, an alkoxy group, an aryloxy group, an alkyl group, or an aryl group.
  • mp and np in Formula (Ph) each independently are preferably an integer of 0 to 2, more preferably 0 or 1, and particularly preferably 0.
  • the content of the polymerization inhibitor with respect to the total mass of the image-recording layer is preferably 0.001% by mass to 5% by mass and more preferably 0.01% by mass to 1% by mass.
  • the image-recording layer used in the present disclosure may contain a chain transfer agent.
  • the chain transfer agent contributes to the improvement of printing durability of the lithographic printing plate.
  • the chain transfer agent is preferably a thiol compound, more preferably a thiol compound having 7 or more carbon atoms from the viewpoint of boiling point (low volatility), and even more preferably a compound having a mercapto group on an aromatic ring (aromatic thiol compound).
  • the thiol compound is preferably a monofunctional thiol compound.
  • chain transfer agent examples include those described in WO2020/262692A .
  • Only one chain transfer agent may be added to the image-recording layer, or two or more chain transfer agents may be used in combination.
  • the content of the chain transfer agent with respect to the total mass of the image-recording layer is preferably 0.01% by mass to 50% by mass, more preferably 0.05% by mass to 40% by mass, and even more preferably 0.1% by mass to 30% by mass.
  • the image-recording layer preferably further contains an oil sensitizing agent.
  • oil sensitizing agent examples include an onium compound, a nitrogen-containing low-molecular-weight compound, an ammonium compound such as an ammonium group-containing polymer, and the like.
  • these compounds function as a surface coating agent for the inorganic lamellar compound and can inhibit the receptivity deterioration due to the inorganic lamellar compound in the middle of printing.
  • the oil sensitizing agent is preferably an onium compound.
  • the onium compound examples include a phosphonium compound, an ammonium compound, a sulfonium compound, and the like. From the viewpoint described above, the onium compound is preferably at least one compound selected from the group consisting of a phosphonium compound and an ammonium compound.
  • ammonium compound can include a nitrogen-containing low-molecular-weight compound, an ammonium group-containing polymer, and the like.
  • oil sensitizing agent examples include those described in WO2020/262692A .
  • the content of the oil sensitizing agent with respect to the total mass of the image-recording layer is preferably 1% by mass to 40.0% by mass, more preferably 2% by mass to 25.0% by mass, and even more preferably 3% by mass to 20.0% by mass.
  • the image-recording layer may contain only one oil sensitizing agent, or two or more oil sensitizing agents may be used in combination.
  • One of the preferred aspects of the image-recording layer used in the present disclosure is an aspect in which the image-recording layer contains two or more compounds as an oil sensitizing agent.
  • the image-recording layer used in the present disclosure preferably uses all the phosphonium compound, the nitrogen-containing low-molecular-weight compound, and the ammonium group-containing polymer as an oil sensitizing agent, and more preferably uses all the phosphonium compound, the quaternary ammonium salts, and the ammonium group-containing polymer as an oil sensitizing agent.
  • the image-recording layer can contain a development accelerator, a surfactant, a higher fatty acid derivative, a plasticizer, an inorganic lamellar compound, and the like. Specifically, the description in paragraphs "0114" to "0159” of JP2008-284817A can be referred to.
  • development accelerator for example, those described in WO2020/262692A may also be used.
  • the image-recording layer in the lithographic printing plate precursor according to the present disclosure can be formed, for example, by preparing a coating liquid by dispersing or dissolving the necessary components described above in a known solvent, coating a support with the coating liquid by a known method such as bar coating, and drying the coating liquid, as described in paragraphs "0142" and "0143" of JP2008-195018A .
  • solvents known solvents can be used. Specific examples thereof include water, acetone, methyl ethyl ketone (2-butanone), cyclohexane, ethyl acetate, ethylene dichloride, tetrahydrofuran, toluene, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, acetylacetone, cyclohexanone, diacetone alcohol, ethylene glycol monomethyl ether acetate, ethylene glycol ethyl ether acetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether acetate, 1-methoxy-2-propanol, 3-methoxy-1-propanol, methoxy methoxyethanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene
  • the coating amount (solid content) of the image-recording layer after coating and drying varies with uses, but from the viewpoint of obtaining excellent sensitivity and excellent film characteristics of the image-recording layer, is preferably 0.3 g/m 2 to 3.0 g/m 2 .
  • the layer thickness of the image-recording layer is preferably 0.1 ⁇ m to 3.0 ⁇ m and more preferably 0.3 ⁇ m to 2.0 ⁇ m.
  • the layer thickness of each layer in the lithographic printing plate precursor is checked by preparing a slice by cutting the lithographic printing plate precursor in a direction perpendicular to the surface of the precursor and observing the cross section of the slice with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the lithographic printing plate precursor according to the present disclosure has a support.
  • the support to be used can be appropriately selected from known supports for a lithographic printing plate precursor.
  • the support is preferably a support having a hydrophilic surface (hereinafter, also called “hydrophilic support”).
  • the support in the present disclosure an aluminum plate is preferable which has been roughened using a known method and has undergone an anodization treatment. That is, the support in the present disclosure preferably has an aluminum plate and an aluminum anodic oxide film disposed on the aluminum plate.
  • the support has an aluminum plate and an anodic oxide film of aluminum disposed on the aluminum plate, the anodic oxide film is at a position closer to a side of the image-recording layer than the aluminum plate and has micropores extending in a depth direction from the surface of the anodic oxide film on the side of the image-recording layer, and the average diameter of the micropores within the surface of the anodic oxide film is more than 10 nm and 100 nm or less.
  • the micropores are each configured with a large diameter portion that extends to a position at a depth of 10 nm to 1,000 nm from the surface of the anodic oxide film and a small diameter portion that is in communication with a bottom portion of the large diameter portion and extends to a position at a depth of 20 nm to 2,000 nm from a communicate position, an average diameter of the large diameter portion within the surface of the anodic oxide film is preferably 15 nm to 100 nm, and an average diameter of the small diameter portion at the communicate position is preferably 13 nm or less.
  • the support has an aluminum plate and an anodic oxide film of aluminum disposed on the aluminum plate, the anodic oxide film is at a position closer to a side of the image-recording layer than the aluminum plate and has micropores extending in a depth direction from the surface of the anodic oxide film on the side of the image-recording layer, the micropores are each configured with a small diameter portion that extends to a position at a depth of 10 nm to 1,000 nm from the surface of the anodic oxide film and a large diameter portion that is in communication with the bottom portion of the small diameter portion and extends to a position at a depth of 20 nm to 2,000 nm from a communicate position, an average diameter of the small diameter portion within the surface of the anodic oxide film is 35 nm or less, and an average maximum diameter of the large diameter portion is 40 nm to 300 nm.
  • the tensile strength of the present support is preferably 160 MPa or more.
  • the tensile strength is measured using an autograph AGC-H5KN (manufactured by Shimadzu Corporation.) as a tensile strength measuring machine and using a sample: JIS metal material tensile test piece No. 5 at a tensile speed of 2 mm/min.
  • the tensile strength of the support is preferably 160 MPa or more, more preferably 170 MPa or more, and particularly preferably 190 MPa or more.
  • the maximum tensile strength of the support is not particularly limited, but is preferably 300 MPa or less, more preferably 250 MPa or less, and even more preferably 220 MPa or less.
  • a support having a tensile strength of 160 MPa or more there is no limit on how to obtain a support having a tensile strength of 160 MPa or more.
  • a support is obtained by incorporating a specific amount of magnesium into the support and setting a reduction rate in a support rolling step to be equal to or more than a specific amount.
  • the aluminum plate used in the aluminum support consists of a dimensionally stable metal containing aluminum as a main component, that is, aluminum or an aluminum alloy. It is preferable that the aluminum plate be selected from a pure aluminum plate and an alloy that contains aluminum as a main component and traces of foreign elements.
  • the foreign elements contained in the aluminum alloy include silicon, iron, manganese, copper, magnesium, chromium, zinc, bismuth, nickel, titanium, and the like.
  • the content of the foreign elements in the alloy is 10% by mass or less.
  • As the aluminum plate a pure aluminum plate is suitable.
  • the aluminum plate may be an alloy that contains traces of foreign elements, because it is difficult to manufacture perfectly pure aluminum by smelting technologies.
  • the composition of the aluminum plate used for the aluminum support is not specified, and it is possible to appropriately use aluminum plates known in the related art, for example, JIS A 1050, JIS A 1100, JIS A 3103, and JIS A 3005 caused to have the above tensile strength.
  • the support is an aluminum support, and a magnesium content in the aluminum support is 0.020% by mass or more. Setting the magnesium content (content rate) in the aluminum support to be 0.020% by mass or more makes it possible to suitably obtain a support having a tensile strength of 160 MPa or more.
  • the magnesium content in the support is preferably 0.020% by mass or more, more preferably 0.040% by mass or more, and even more preferably 0.060% by mass or more.
  • the magnesium content in the support is not particularly limited, but is usually 0.200% by mass or less, preferably 0.150% by mass or less, and more preferably 0.100% by mass or less.
  • the magnesium content rate in the support was measured using an emission analysis apparatus (PDA-5500, manufactured by Shimadzu Corporation.) as a measurement apparatus.
  • PDA-5500 manufactured by Shimadzu Corporation.
  • the support is an aluminum support
  • the aluminum support is configured with an aluminum plate that is subjected to a heat treatment at a temperature of 250°C or higher and then subjected to cold rolling at a reduction rate of 80% or more in the rolling step.
  • this aspect it is possible to suitably obtain a support having a tensile strength of 160 MPa or more.
  • the reduction rate is an amount calculated by (h1 - h2)/h1 where h1 represents a plate thickness of a material not yet being rolled and h2 represents a plate thickness of the material having been rolled.
  • the reduction rate shows a processing degree of rolling, which is preferably 80% or more, more preferably 90% or more, and even more preferably 95% or more.
  • the reduction rate is preferably less than 99% and more preferably 98% or less.
  • the thickness of the support (preferably, the aluminum plate) is preferably about 0.1 mm to 0.6 mm.
  • the support preferably has an anodic oxide film.
  • the anodic oxide film means an anodic oxide film (preferably an anodic aluminum oxide film) which is formed on the surface of a support (preferably an aluminum plate) by an anodization treatment and has supermicropores (also called micropores).
  • the micropores extend from the surface of the anodic oxide film on the side opposite to the support along the thickness direction (support side, depth direction).
  • the average diameter (average opening diameter) of the micropores within the surface of the anodic oxide film is preferably 7 nm to 150 nm, more preferably 10 nm to 100 nm, even more preferably 10 nm to 60 nm, particularly preferably 15 nm to 60 nm, and most preferably 18 nm to 40 nm.
  • the depth of the micropores is preferably 10 nm to 3,000 nm, more preferably 10 nm to 2,000 nm, and even more preferably 10 nm to 1,000 nm.
  • the micropores have a substantially straight tubular shape (substantially cylindrical shape) in which the diameter of the micropores substantially does not change in the depth direction (thickness direction).
  • the micropores may also have a conical shape that continues to taper in the depth direction (thickness direction).
  • the micropores may have a shape that discontinuously tapers along the depth direction (thickness direction).
  • micropores having a shape that discontinuously tapers in the depth direction include micropores each configured with a large diameter portion that extends along the depth direction from the surface of the anodic oxide film and a small diameter portion that is in communication with the bottom portion of the large diameter portion and extends along the depth direction from the communicate position.
  • the micropores are preferable which are each configured with a large diameter portion that extends 10 nm to 1,000 nm in the depth direction from the surface of the anodic oxide film and a small diameter portion that is in communication with the bottom portion of the large diameter portion and extends 20 nm to 2,000 nm in the depth direction from the communicate position.
  • the average diameter (average opening diameter) of the large diameter portion within the surface of the anodic oxide film is preferably 7 nm to 150 nm, more preferably 10 nm to 100 nm, even more preferably 15 nm to 100 nm, particularly preferably 15 nm to 60 nm, and most preferably 18 nm to 40 nm.
  • FE-SEM field emission scanning electron microscope
  • equivalent circle diameter is a diameter determined on an assumption that the opening portion is in the form of a circle having the same projected area as the projected area of the opening portion.
  • the bottom portion of the large diameter portion is preferably in a position at a depth of 70 nm to 1,000 nm (hereinafter, also called depth A) from the surface of the anodic oxide film. That is, the large diameter portion is preferably a pore portion extending to a position at a depth of 70 nm to 1,000 nm from the surface of the anodic oxide film in the depth direction (thickness direction).
  • the depth A is more preferably 90 nm to 850 nm, even more preferably 90 nm to 800 nm, and particularly preferably 90 nm to 600 nm.
  • the depth is a value obtained by taking an image (150,000X magnification) of a cross section of the anodic oxide film, measuring the depths of 25 or more large diameter portions, and calculating the arithmetic mean thereof.
  • the shape of the large diameter portion is not particularly limited.
  • Examples of the shape of the large diameter portion include a substantially straight tubular shape (substantially cylindrical shape) and a conical shape that tapers along the depth direction (thickness direction). Among these, a substantially straight tubular shape is preferable.
  • the shape of the bottom portion of the large diameter portion is not particularly limited, and may be a curved (convex) or planar shape.
  • the inner diameter of the large diameter portion is not particularly limited, but is preferably as large as the diameter of the opening portion or smaller than the diameter of the opening portion. There may be a difference of about 1 nm to 10 nm between the inner diameter of the large diameter portion and the diameter of the opening portion.
  • the small diameter portion is a pore portion that is in communication with the bottom portion of the large diameter portion and further extends from the communicate position in the depth direction (thickness direction).
  • one small diameter portion is in communication with one large diameter portion.
  • two or more small diameter portions may be in communication with the bottom portion of one large diameter portion.
  • the average diameter of the small diameter portion at the communicate position is preferably less than 15 nm, more preferably 13 nm or less, even more preferably 11 nm or less, and particularly preferably 10 nm or less.
  • the lower limit thereof is not particularly limited, but is preferably 5 nm.
  • the upper portion of the anodic oxide film region where the large diameter portion is located
  • may be cut for example, cut by using argon gas
  • the surface of the anodic oxide film may be observed with FE-SEM described above, and the average diameter of the small diameter portion may be determined.
  • equivalent circle diameter is a diameter determined on an assumption that the opening portion is in the form of a circle having the same projected area as the projected area of the opening portion.
  • the bottom portion of the small diameter portion is preferably in a position 20 nm to 2,000 nm distant from the communicate position (corresponding to the depth A described above) with the large diameter portion in the depth direction.
  • the small diameter portion is a pore portion that extends further from the communicate position with the large diameter portion in the depth direction (thickness direction), and the depth of the small diameter portion is preferably 20 nm to 2,000 nm, more preferably 100 nm to 1,500 nm, and particularly preferably 200 nm to 1,000 nm.
  • the depth is a value obtained by taking an image (150,000X magnification) of a cross section of the anodic oxide film, measuring the depths of 25 or more small diameter portions, and calculating the arithmetic mean thereof.
  • the shape of the small diameter portion is not particularly limited.
  • Examples of the shape of the small diameter portion include a substantially straight tubular shape (substantially cylindrical shape) and a conical shape that tapers along the depth direction. Among these, a substantially straight tubular shape is preferable.
  • the shape of the bottom portion of the small diameter portion is not particularly limited, and may be a curved (convex) or planar shape.
  • the inner diameter of the small diameter portion is not particularly limited, and may be the same as the diameter at the communicate position, or may be smaller or larger than the diameter at the communicate position. Generally, there may be a difference of about 1 nm to 10 nm between the inner diameter of the small diameter portion and the diameter of the opening portion.
  • the ratio of the average diameter of the large diameter portion within the surface of the anodic oxide film to the average diameter of the small diameter portion at the communicate position, (average diameter of large diameter portion within surface of anodic oxide film)/(average diameter of small diameter portion at communicate position) is preferably 1.1 to 13, and more preferably 2.5 to 6.5.
  • the ratio of the depth of the large diameter portion to the depth of the small diameter portion, (depth of large diameter portion)/(depth of small diameter portion) is preferably 0.005 to 50, and more preferably 0.025 to 40.
  • the micropores have a substantially straight tubular shape (substantially cylindrical shape) in which the diameter of the micropores substantially does not change in the depth direction (thickness direction).
  • the micropores may also have a conical shape that continues to widen in the depth direction (thickness direction).
  • the micropores may have a shape that discontinuously widens along the depth direction (thickness direction).
  • micropores having a shape that discontinuously widens in the depth direction include micropores each configured with a small diameter portion that extends along the depth direction from the surface of the anodic oxide film and a large diameter portion that is in communication with the bottom portion of the small diameter portion and extends along the depth direction from the communicate position.
  • the micropores are preferable which are each configured with a small diameter portion that extends 10 nm to 1,000 nm in the depth direction from the surface of the anodic oxide film and a large diameter portion that is in communication with the bottom portion of the small diameter portion and extends 20 nm to 2,000 nm in the depth direction from the communicate position.
  • the average diameter (average opening diameter) of the small diameter portion within the surface of the anodic oxide film is not particularly limited, but is preferably 35 nm or less, more preferably 25 nm or less, and particularly preferably 20 nm or less.
  • the lower limit thereof is not particularly limited, but is preferably 15 nm.
  • FE-SEM field emission scanning electron microscope
  • equivalent circle diameter is a diameter determined on an assumption that the opening portion is in the form of a circle having the same projected area as the projected area of the opening portion.
  • the bottom portion of the small diameter portion is preferably in a position at a depth of 70 nm to 1,000 nm (hereinafter, also called depth A') from the surface of the anodic oxide film. That is, the small diameter portion is preferably a pore portion extending 70 nm to 1,000 nm in the depth direction (thickness direction) from the surface of the anodic oxide film.
  • the depth is a value obtained by taking an image (150,000X magnification) of a cross section of the anodic oxide film, measuring the depths of 25 or more large diameter portions, and calculating the arithmetic mean thereof.
  • the shape of the small diameter portion is not particularly limited.
  • Examples of the shape of the large diameter portion include a substantially straight tubular shape (substantially cylindrical shape) and a conical shape that widens along the depth direction (thickness direction). Among these, a substantially straight tubular shape is preferable.
  • the shape of the bottom portion of the small diameter portion is not particularly limited, and may be a curved (convex) or planar shape.
  • the inner diameter of the small diameter portion is not particularly limited, but is preferably as large as the diameter of the opening portion or smaller than the diameter of the opening portion. Generally, there may be a difference of about 1 nm to 10 nm between the inner diameter of the small diameter portion and the diameter of the opening portion.
  • the large diameter portion is a pore portion that is in communication with the bottom portion of the small diameter portion and further extends from the communicate position in the depth direction (thickness direction).
  • the bottom portion of one large diameter portion may be in communication with two or more small diameter portions.
  • the average diameter of the large diameter portion at the communicate position is preferably 20 nm to 400 nm, more preferably 40 nm to 300 nm, even more preferably 50 nm to 200 nm, and particularly preferably 50 nm to 100 nm.
  • the upper portion of the anodic oxide film region where the small diameter portion is located
  • may be cut for example, cut by using argon gas
  • the surface of the anodic oxide film may be observed with FE-SEM described above, and the average diameter of the large diameter portion may be determined.
  • equivalent circle diameter is a diameter determined on an assumption that the opening portion is in the form of a circle having the same projected area as the projected area of the opening portion.
  • the bottom portion of the large diameter portion is preferably in a position 20 nm to 2,000 nm distant from the communicate position (corresponding to the depth A' described above) with the small diameter portion in the depth direction.
  • the large diameter portion is a pore portion that extends further from the communicate position with the small diameter portion in the depth direction (thickness direction), and the depth of the large diameter portion is preferably 20 nm to 2,000 nm, more preferably 100 nm to 1,500 nm, and particularly preferably 200 nm to 1,000 nm.
  • the depth is a value obtained by taking an image (150,000X magnification) of a cross section of the anodic oxide film, measuring the depths of 25 or more large diameter portions, and calculating the arithmetic mean thereof.
  • the shape of the large diameter portion is not particularly limited.
  • Examples of the shape of the large diameter portion include a substantially straight tubular shape (substantially cylindrical shape) and a conical shape that tapers along the depth direction. Among these, a substantially straight tubular shape is preferable.
  • the shape of the bottom portion of the large diameter portion is not particularly limited, and may be a curved (convex) or planar shape.
  • the inner diameter of the large diameter portion is not particularly limited, and may be the same as the diameter at the communicate position, or may be smaller or larger than the diameter at the communicate position. Generally, there may be a difference of about 1 nm to 10 nm between the inner diameter of the large diameter portion and the diameter of the opening portion.
  • the support preferably has an anodic oxide film
  • a support is useful in which the surface of an anodic oxide film (surface on which an image-recording layer is to be formed) has high brightness.
  • the plate is inspected to check whether an image is printed as intended.
  • the on-press development type lithographic printing plate precursor it is required to check the image at the stage where the image is exposed. Therefore, a unit generating a so-called printed image in an image exposure portion is used.
  • Examples of a method of quantitatively evaluating the visibility of an image area (image visibility) of the on-press development type lithographic printing plate precursor having undergone exposure of an image include a method of measuring the brightness of an image exposure portion and the brightness of a non-exposed portion and calculating the difference therebetween.
  • a value of brightness L* in the CIEL*a*b* color system can be used as the brightness.
  • the brightness can be measured using a color difference meter (Spectro Eye, manufactured by X-Rite, Incorporated.). The larger the difference between the measured brightness of the image exposure portion and the measured brightness of the non-exposed portion is, the higher the visibility of the image area is.
  • the value of brightness L* of the surface of the anodic oxide film in the CIEL*a*b* color system is, the more effective it is to increase the difference between the brightness of the image exposure portion and the brightness of the non-exposed portion. That is, the value of the brightness L* is preferably 60 to 100.
  • the support having an anodic oxide film may have a backcoat layer containing the organic high-molecular-weight compound described in JP1993-45885A ( JP-H5-45885A ), the alkoxy compound of silicon described in JP1994-35174A ( JP-H6-35174A ), or the like, on a surface opposite to the side where a constitutional layer containing a hydroxy acid compound having two or more hydroxyl groups is formed.
  • the aluminum support having an anodic oxide film can be manufactured using known methods.
  • the manufacturing method of the aluminum support having an anodic oxide film is not particularly limited. Examples of preferred aspects of the manufacturing method of the aluminum support having an anodic oxide film include a method including a step of performing a roughening treatment on an aluminum plate (roughening treatment step), a step of anodizing the aluminum plate having undergone the roughening treatment (anodization treatment step), and a step of bringing the aluminum plate having an anodic oxide film obtained by the anodization treatment step into contact with an acidic aqueous solution or an alkaline aqueous solution to increase the diameter of micropores in the anodic oxide film (pore widening treatment step).
  • the roughening treatment step is a step of performing a roughening treatment including an electrochemical roughening treatment on the surface of the aluminum plate.
  • the roughening treatment step is preferably performed before the anodization treatment step which will be described later. However, in a case where the surface of the aluminum plate already has a preferable shape, the roughening treatment step may not be performed.
  • an electrochemical roughening treatment may be performed, or an electrochemical roughening treatment may be performed in combination with at least either a mechanical roughening treatment or a chemical roughening treatment.
  • the electrochemical roughening treatment is preferably performed in an aqueous solution of nitric acid or hydrochloric acid.
  • the mechanical roughening treatment is performed such that the aluminum plate has a surface roughness Ra of 0.35 ⁇ m to 1.0 ⁇ m.
  • the conditions of the mechanical roughening treatment are not particularly limited.
  • the mechanical roughening treatment can be performed according to the method described in JP1975-40047B ( JP-S50-40047B ).
  • the mechanical roughening treatment can be performed by a brush graining treatment using a pumice stone suspension or by a transfer method.
  • the chemical roughening treatment is also not particularly limited, and can be performed according to known methods.
  • etching with an acid and etching with an alkali are known.
  • One of the examples of particularly efficient etching methods is a chemical etching treatment using an alkaline solution (hereinafter, also called “alkaline etching treatment").
  • the alkaline agent used in the alkaline solution is not particularly limited. Suitable examples thereof include caustic soda, caustic potash, sodium metasilicate, sodium carbonate, sodium aluminate, sodium gluconate, and the like.
  • the alkaline solution may contain aluminum ions.
  • the concentration of the alkaline agent in the alkaline solution is preferably 0.01% by mass or more and more preferably 3% by mass or more. In addition, the concentration is preferably 30% by mass or less and more preferably 25% by mass or less.
  • the temperature of the alkaline solution is preferably equal to or higher than room temperature and more preferably 30°C or higher. In addition, the temperature is preferably 80°C or lower and more preferably 75°C or lower.
  • the etching amount is preferably 0.01 g/m 2 or more, and more preferably 0.05 g/m 2 or more. In addition, the etching amount is preferably 30 g/m 2 or less, and more preferably 20 g/m 2 or less.
  • the treatment time preferably is in a range of 2 seconds to 5 minutes depending on the etching amount. In view of improving productivity, the treatment time is more preferably 2 seconds to 10 seconds.
  • the chemical etching treatment by using a low-temperature acidic solution (hereinafter, also called “desmutting treatment") is preferably performed.
  • the acid used in the acidic solution is not particularly limited, and examples thereof include sulfuric acid, nitric acid, and hydrochloric acid.
  • the concentration of the acidic solution is preferably 1% to 50% by mass.
  • the temperature of the acidic solution is preferably 20°C to 80°C. In a case where the concentration and temperature of the acidic solution are in this range, the lithographic printing plate using an aluminum support becomes more resistant to dot-like stain.
  • a mechanical roughening treatment may be performed before the treatment (1) of the aspect SA or before the treatment (11) of the aspect SB.
  • the amount of the aluminum plate dissolved by the first alkaline etching treatment and the fourth alkaline etching treatment is preferably 0.5 g/m 2 to 30 g/m 2 and more preferably 1.0 g/m 2 to 20 g/m 2 .
  • Examples of the aqueous solution containing nitric acid as a main component used in the first electrochemical roughening treatment of the aspect SA include aqueous solutions used in the electrochemical roughening treatment using direct current or alternating current. Examples thereof include an aqueous solution obtained by adding aluminum nitrate, sodium nitrate, ammonium nitrate, or the like to a 1 g/L to 100 g/L aqueous nitric acid solution.
  • Examples of the aqueous solution containing hydrochloric acid as a main component used in the second electrochemical roughening treatment of the aspect SA and in the third electrochemical roughening treatment of the aspect SB include aqueous solutions used in the electrochemical roughening treatment using direct current or alternating current. Examples thereof include an aqueous solution obtained by adding 0 g/L to 30 g/L of sulfuric acid to a 1 g/L to 100 g/L aqueous hydrochloric acid solution. Nitrate ions such as aluminum nitrate, sodium nitrate, or ammonium nitrate; or hydrochloric acid ions such as aluminum chloride, sodium chloride, or ammonium chloride may be further added to the aqueous solution.
  • a sine wave, a square wave, a trapezoidal wave, a triangular wave, or the like can be used as the waveform of an alternating current power source for the electrochemical roughening treatment.
  • the frequency is preferably 0.1 Hz to 250 Hz.
  • Fig. 1 is a graph showing an example of an alternating waveform current waveform diagram used for an electrochemical roughening treatment.
  • ta represents an anodic reaction time
  • tc represents a cathodic reaction time
  • tp represents the time taken for current to reach a peak from 0
  • Ia represents the peak current on the anodic cycle side
  • Ic represents the peak current on the cathodic cycle side.
  • the time tp taken for current to reach a peak from 0 is preferably 1 msec to 10 msec.
  • a ratio tc/ta of the cathodic reaction time tc to the anodic reaction time ta of the aluminum plate is preferably within a range of 1 to 20
  • a ratio Qc/Qa of an electricity quantity Qc during the cathodic reaction to an electricity quantity Qa during the anodic reaction of the aluminum plate is preferably within a range of 0.3 to 20
  • the anodic reaction time ta is preferably within a range of 5 msec to 1,000 msec.
  • the peak current density of the trapezoidal wave is preferably 10 to 200 A/dm 2 at both the anodic cycle side Ia and the cathodic cycle side Ic of the current.
  • Ic/Ia is preferably 0.3 to 20.
  • the total quantity of electricity that participates in the anodic reaction of the aluminum plate is preferably 25 C/dm 2 to 1,000 C/dm 2 .
  • the electrochemical roughening treatment using alternating current can be performed using the device shown in Fig. 2 .
  • Fig. 2 is a lateral view showing an example of a radial cell in an electrochemical roughening treatment using alternating current.
  • 50 represents a main electrolytic cell
  • 51 represents an alternating current power source
  • 52 represents a radial drum roller
  • 53a and 53b represent main poles
  • 54 represents an electrolytic solution supply port
  • 55 represents an electrolytic solution
  • 56 represents a slit
  • 57 represents an electrolytic solution channel
  • 58 represents an auxiliary anode
  • 60 represents an auxiliary anode cell
  • W represents an aluminum plate.
  • the electrolysis conditions may be the same as or different from each other.
  • the aluminum plate W is wound around the radial drum roller 52 immersed and disposed in the main electrolytic cell 50. While being transported, the aluminum plate W is electrolyzed by the main poles 53a and 53b connected to the alternating current power source 51. From the electrolytic solution supply port 54, the electrolytic solution 55 is supplied to the electrolytic solution channel 57 between the radial drum roller 52 and the main poles 53a and 53b through the slit 56. The aluminum plate W treated in the main electrolytic cell 50 is then electrolyzed in the auxiliary anode cell 60. In the auxiliary anode cell 60, the auxiliary anode 58 is disposed to face the aluminum plate W. The electrolytic solution 55 is supplied to flow in the space between the auxiliary anode 58 and the aluminum plate W.
  • the amount of the aluminum plate dissolved by the second alkaline etching treatment is preferably 1.0 g/m 2 to 20 g/m 2 and more preferably 2.0 g/m 2 to 10 g/m 2 .
  • the amount of the aluminum plate dissolved by the third alkaline etching treatment and the fifth alkaline etching treatment is preferably 0.01 g/m 2 to 0.8 g/m 2 and more preferably 0.05 g/m 2 to 0.3 g/m 2 .
  • an acidic aqueous solution containing phosphoric acid, nitric acid, sulfuric acid, chromic acid, hydrochloric acid, or a mixed acid consisting of two or more of these acids is suitably used.
  • the concentration of the acid in the acidic aqueous solution is preferably 0.5% by mass to 60% by mass.
  • the anodization treatment step is a step of performing an anodization treatment on the aluminum plate having undergone the roughening treatment such that an aluminum oxide film is formed on the surface of the aluminum plate.
  • an anodic oxide film of aluminum having micropores is formed on the surface of the aluminum plate.
  • the anodization treatment can be performed according to the method known in the field of the related art, by appropriately setting manufacturing conditions in consideration of the desired micropore shape.
  • an aqueous solution of sulfuric acid, phosphoric acid, oxalic acid, or the like can be mainly used as an electrolytic solution.
  • an aqueous solution or a non-aqueous solution of chromic acid, sulfamic acid, benzenesulfonic acid, or the like or an aqueous solution or a non-aqueous solution containing two or more kinds among the above acids can also be used.
  • direct current or alternating current is applied to the aluminum plate in the electrolytic solution, an anodic oxide film can be formed on the surface of the aluminum plate.
  • the electrolytic solution may contain aluminum ions.
  • the content of the aluminum ions is not particularly limited, but is preferably 1 g/L to 10 g/L.
  • the conditions of the anodization treatment are appropriately set depending on the electrolytic solution used. Generally, the concentration of the electrolytic solution of 1% by mass to 80% by mass (preferably 5% by mass to 20% by mass), the liquid temperature of 5°C to 70°C (preferably 10°C to 60°C), the current density of 0.5 A/dm 2 to 60 A/dm 2 (preferably 5 A/dm 2 to 50 A/dm 2 ), the voltage of 1 V to 100 V (preferably 5 V to 50 V), and the electrolysis time of 1 second to 100 seconds (preferably 5 seconds to 60 seconds) are appropriate.
  • One of the preferred examples of the anodization treatment is the anodization method described in British Patent 1,412,768 , which is performed in a sulfuric acid at a high current density.
  • the anodization treatment can also be performed multiple times. It is possible to change one or more of conditions, such as the type, concentration, and liquid temperature of the electrolytic solution used in each anodization treatment, the current density, the voltage, and the electrolysis time. In a case where the anodization treatment is performed twice, sometime the firstly performed anodization treatment is called first anodization treatment, and the secondly performed anodization treatment is called second anodization treatment. Performing the first anodization treatment and the second anodization treatment makes it possible to form anodic oxide films having different shapes and to provide a lithographic printing plate precursor having excellent printing performance.
  • the following pore widening treatment after the anodization treatment and then perform the anodization treatment again.
  • the first anodization treatment, the pore widening treatment, and the second anodization treatment are performed.
  • micropores each configured with a large diameter portion that extends from the surface of the anodic oxide film along the depth direction and a small diameter portion that is in communication with the bottom portion of the large diameter portion and extends from the communicate position along the depth direction.
  • the pore widening treatment step is a treatment of enlarging the diameter of micropores (pore diameter) present in the anodic oxide film formed by the anodization treatment step (pore diameter enlarging treatment).
  • pore diameter the diameter of the micropores
  • the pore widening treatment the diameter of the micropores is enlarged, and an anodic oxide film having micropores having a larger average diameter is formed.
  • the pore widening treatment can be carried out by bringing the aluminum plate obtained by the anodization treatment step into contact with an acidic aqueous solution or an alkaline aqueous solution.
  • the contact method is not particularly limited, and examples thereof include a dipping method and a spraying method. Among these, a dipping method is preferable.
  • an alkaline aqueous solution is used in the pore widening treatment step, it is preferable to use at least one alkaline aqueous solution selected from the group consisting of sodium hydroxide, potassium hydroxide, and lithium hydroxide.
  • the concentration of the alkaline aqueous solution is preferably 0.1% by mass to 5% by mass.
  • the pH of the alkaline aqueous solution is adjusted to 11 to 13, and the aluminum plate is brought into contact with the alkaline aqueous solution for 1 second to 300 seconds (preferably 1 second to 50 seconds) under the condition of 10°C to 70°C (preferably 20°C to 50°C).
  • the alkaline treatment liquid may contain a metal salt of a polyvalent weak acid such as carbonate, borate, or phosphate.
  • an acidic aqueous solution in the pore widening treatment step, it is preferable to use an aqueous solution of an inorganic acid such as sulfuric acid, phosphoric acid, nitric acid, or hydrochloric acid, or a mixture of these.
  • concentration of the acidic aqueous solution is preferably 1% by mass to 80% by mass and more preferably 5% by mass to 50% by mass.
  • the aluminum plate is brought into contact with the acidic aqueous solution for 1 second to 300 seconds (preferably 1 second to 150 seconds) under the condition of a liquid temperature of the acidic aqueous solution of 5°C to 70°C (preferably 10°C to 60°C).
  • the alkaline aqueous solution or the acidic aqueous solution may contain aluminum ions.
  • the content of the aluminum ions is not particularly limited, but is preferably 1 g/L to 10 g/L.
  • the manufacturing method of the aluminum support having an anodic oxide film may include a hydrophilic treatment step of performing a hydrophilic treatment after the pore widening treatment step described above.
  • a hydrophilic treatment it is possible to use the known method described in paragraphs "0109" to "0114" of JP2005-254638A .
  • the hydrophilic treatment is preferably performed by a method of immersing the aluminum plate in an aqueous solution of an alkali metal silicate such as sodium silicate or potassium silicate, a method of coating the aluminum plate with a hydrophilic vinyl polymer or a hydrophilic compound to form a hydrophilic undercoat layer, or the like.
  • an alkali metal silicate such as sodium silicate or potassium silicate
  • a method of coating the aluminum plate with a hydrophilic vinyl polymer or a hydrophilic compound to form a hydrophilic undercoat layer or the like.
  • hydrophilic treatment using an aqueous solution of an alkali metal silicate such as sodium silicate or potassium silicate can be performed according to the method and procedure described in US2714066A and US3181461A .
  • the lithographic printing plate precursor according to the present disclosure preferably has an undercoat layer (also called interlayer in some cases) between the image-recording layer and the support.
  • the undercoat layer enhances the adhesiveness between the support and the image-recording layer in an exposed portion, and enables the image-recording layer to be easily peeled from the support in a non-exposed portion. Therefore, the undercoat layer inhibits the deterioration of printing durability and contributes to the improvement of developability.
  • the undercoat layer functions as a heat insulating layer and thus brings about an effect of preventing sensitivity reduction resulting from the diffusion of heat generated by exposure to the support.
  • Examples of compounds that are used in the undercoat layer include polymers having adsorbent groups that can be adsorbed onto the surface of the support and hydrophilic groups. In order to improve adhesiveness to the image-recording layer, polymers having adsorbent groups and hydrophilic groups plus crosslinking groups are preferable.
  • the compounds that are used in the undercoat layer may be low-molecular-weight compounds or polymers. As necessary, as the compounds that are used in the undercoat layer, two or more compounds may be used by being mixed together.
  • the compound used in the undercoat layer is a polymer
  • a copolymer of a monomer having an adsorbent group, a monomer having a hydrophilic group, and a monomer having a crosslinking group is preferable.
  • adsorbent group that can be adsorbed onto the surface of the support a phenolic hydroxy group, a carboxy group, -PO 3 H 2 , -OPO 3 H 2 , -CONHSO 2 -, -SO 2 NHSO 2 -, and -COCH 2 COCH 3 are preferable.
  • hydrophilic groups a sulfo group or salts thereof and salts of a carboxy group are preferable.
  • crosslinking groups an acryl group, a methacryl group, an acrylamide group, a methacrylamide group, an allyl group, and the like are preferable.
  • the polymer may have a crosslinking group introduced by the formation of a salt of a polar substituent of the polymer and a compound that has a substituent having charge opposite to that of the polar substituent and an ethylenically unsaturated bond, or may be further copolymerized with monomers other than the monomers described above and preferably with hydrophilic monomers.
  • silane coupling agents having addition polymerizable ethylenic double bond reactive groups described in JP1998-282679A ( JP-H10-282679A ) and phosphorus compounds having ethylenic double bond reactive groups described in JP1990-304441A ( JP-H02-304441A ) are suitable.
  • the low-molecular-weight compounds or high-molecular-weight compounds having crosslinking groups (preferably ethylenically unsaturated groups), functional groups that interact with the surface of the support, and hydrophilic groups described in JP2005-238816A , JP2005-125749A , JP2006-239867A , and JP2006-215263A are also preferably used.
  • the high-molecular-weight polymers having adsorbent groups that can be adsorbed onto the surface of the support are more preferable.
  • the content of ethylenically unsaturated group in the polymer used in the undercoat layer is preferably 0.1 mmol to 10.0 mmol per gram of the polymer and more preferably 0.2 mmol to 5.5 mmol per gram of the polymer.
  • the weight-average molecular weight (Mw) of the polymer used in the undercoat layer is preferably 5,000 or more and more preferably 10,000 to 300,000.
  • the undercoat layer may contain, in addition to the compounds for the undercoat layer described above, a chelating agent, a secondary or tertiary amine, a polymerization inhibitor, a compound having an amino group or a functional group capable of inhibiting polymerization and a group that interacts with the surface of the support (for example, 1,4-diazabicyclo[2.2.2]octane (DABCO), 2,3,5,6-tetrahydroxy-p-quinone, chloranil, sulfophthalic acid, hydroxyethyl ethylenediaminetriacetic acid, dihydroxyethyl ethylenediaminediacetic acid, hydroxyethyl iminodiacetic acid, and the like), and the like.
  • a chelating agent for example, 1,4-diazabicyclo[2.2.2]octane (DABCO), 2,3,5,6-tetrahydroxy-p-quinone, chloranil, sulfophthalic acid, hydroxye
  • the undercoat layer is formed by known coating methods.
  • the coating amount (solid content) of the undercoat layer is preferably 0.1 mg/m 2 to 100 mg/m 2 and more preferably 1 mg/m 2 to 30 mg/m 2 .
  • the lithographic printing plate precursor according to the present disclosure preferably has a protective layer (also called “overcoat layer” in some cases) on a surface of the image-recording layer that is opposite to the support side.
  • a protective layer also called “overcoat layer” in some cases
  • the lithographic printing plate precursor according to the present disclosure preferably has a support, an image-recording layer, and a protective layer in this order.
  • the protective layer may have a function of preventing the damage of the image-recording layer, and a function of preventing ablation during exposure to high-illuminance lasers, in addition to a function of suppressing the reaction inhibiting image formation by blocking oxygen.
  • the protective layer having such characteristics is described, for example, in US3458311A and JP1980-49729B ( JP-S55-49729B ).
  • any of water-soluble polymers and water-insoluble polymers can be appropriately selected.
  • two or more such polymers can be used by being mixed together.
  • the polymers with low oxygen permeability preferably include a water-soluble polymer.
  • a water-soluble polymer means a polymer having a solubility of more than 5% by mass in water at 25°C.
  • water-soluble polymer used in the protective layer examples include polyvinyl alcohol, modified polyvinyl alcohol, polyvinylpyrrolidone, a cellulose derivative, polyethylene glycol, poly(meth)acrylonitrile, and the like.
  • the water-soluble polymer preferably includes at least one selected from the group consisting of a modified polyvinyl alcohol and a cellulose derivative.
  • modified polyvinyl alcohol acid-modified polyvinyl alcohol having a carboxy group or a sulfo group is preferably used. Specific examples thereof include modified polyvinyl alcohols described in JP2005-250216A and JP2006-259137A .
  • cellulose derivative examples include methyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, and the like.
  • a polymer containing polyvinyl alcohol is preferable, and a polymer containing polyvinyl alcohol having a saponification degree of 50% or more is more preferable.
  • the saponification degree is preferably 60% or more, more preferably 70% or more, and even more preferably 85% or more.
  • the upper limit of the saponification degree is not particularly limited, and may be 100% or less.
  • the saponification degree is measured according to the method described in JIS K 6726: 1994.
  • the protective layer for example, an aspect in which the protective layer contains polyvinyl alcohol and polyethylene glycol is also preferable.
  • the content of the water-soluble polymer with respect to the total mass of the protective layer is preferably 1% by mass to 99% by mass, more preferably 3% by mass to 97% by mass, and even more preferably 5% by mass to 95% by mass.
  • the protective layer preferably contains a hydrophobic polymer.
  • the hydrophobic polymer refers to a polymer that dissolves less than 5 g or does not dissolve in 100 g of pure water at 125°C.
  • hydrophobic polymer examples include polyethylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyalkyl (meth)acrylate ester (for example, polymethyl (meth)acrylate, polyethyl (meth)acrylate, polybutyl (meth)acrylate, and the like), a copolymer obtained by combining raw material monomers of these resins, and the like.
  • the hydrophobic polymer preferably includes a polyvinylidene chloride resin.
  • the hydrophobic polymer preferably includes a styrene-acrylic copolymer (also called styrene acrylic resin).
  • the hydrophobic polymer is preferably hydrophobic polymer particles.
  • hydrophobic polymer Only one hydrophobic polymer may be used, or two or more hydrophobic polymers may be used in combination.
  • the content of the hydrophobic polymer with respect to the total mass of the protective layer is preferably 1% by mass to 70% by mass, more preferably 5% by mass to 50% by mass, and even more preferably 10% by mass to 40% by mass.
  • the proportion of the area of the hydrophobic polymer occupying the surface of the protective layer is preferably 30 area% or more, more preferably 40 area% or more, and even more preferably 50 area% or more.
  • the upper limit of the proportion of the area of the hydrophobic polymer occupying the surface of the protective layer is, for example, 90 area%.
  • the proportion of the area of the hydrophobic polymer occupying the surface of the protective layer can be measured as follows.
  • the surface of the protective layer is irradiated with Bi ion beams (primary ions) at an acceleration voltage of 30 kV, and the peak of ions (secondary ions) corresponding to a hydrophobic portion (that is, a region formed of the hydrophobic polymer) that are emitted from the surface is measured, so that the hydrophobic portion is mapped.
  • the proportion of the area occupied by the hydrophobic portion is determined and adopted as "proportion of the area of the hydrophobic polymer occupying the surface of the protective layer".
  • the proportion is measured using the peak of C 6 H 13 O - .
  • the hydrophobic polymer is polyvinylidene chloride
  • the proportion is measured using the peak of C 2 H 2 Cl + .
  • the proportion of occupied area can be adjusted by the amount of the hydrophobic polymer added or the like.
  • the protective layer preferably contains a second infrared absorber (hereinafter, also called a specific infrared absorber as distinguished from the infrared absorber contained in the image-recording layer) which includes a thermally decomposable group transformed into a group that is a stronger electron donor upon exposure to heat and/or infrared radiation, and which is capable of forming a print-out image upon exposure to heat and/or infrared radiation.
  • a second infrared absorber hereinafter, also called a specific infrared absorber as distinguished from the infrared absorber contained in the image-recording layer
  • the specific infrared absorber is preferably a compound represented by the following Formula (VI).
  • Ar 1 and Ar 2 each independently represent an optionally substituted aromatic hydrocarbon group or an aromatic hydrocarbon group having an optionally substituted benzene ring
  • W 1 and W 2 each independently represent a sulfur atom, an oxygen atom, or NR*, where R* represents an optionally substituted alkyl group, NH, or -CM 10 M 11 group
  • M 10 and M 11 each independently represent an optionally substituted aliphatic hydrocarbon group or an optionally substituted aryl group or heteroaryl group
  • M 1 and M 2 each independently represent a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or a group of atoms required to form an optionally substituted cyclic structure of M 1 and M 2
  • M 3 and M 4 each independently represent an optionally substituted aliphatic hydrocarbon group
  • M 5 to M 8 each independently represent a hydrogen atom, a halogen atom, or an optionally substituted aliphatic hydrocarbon group
  • M 9 is a group which is converted into a group that
  • a, b, c, and d are each independently 0 or 1.
  • M 9 may contain one or more counter ions in order to obtain an electrically neutral compound.
  • R 17 represents a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, an optionally substituted aryl group or heteroaryl group, or atomic groups necessary to form a cyclic structure together with R 5 or R 11 .
  • R 4 represents -OR 10 , -NR 13 R 14 , or -CF 3 .
  • R 10 represents an optionally substituted aryl group or heteroaryl group, or an aliphatic hydrocarbon group which may be branched.
  • R 13 and R 14 each independently represent a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, an optionally substituted aryl group or heteroaryl group, or atomic groups necessary to form a cyclic structure together with R 13 and R 14 .
  • R 6 represents an optionally substituted aliphatic hydrocarbon group, an optionally substituted aryl group or heteroaryl group, -OR 10 , -NR 13 R 14 , or -CF 3 .
  • R 5 represents a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, a SO 3 - group, a -COOR 18 , an optionally substituted aryl group or heteroaryl group, or atomic groups necessary to form a cyclic structure together with at least one of R 10 , R 13 , and R 14 .
  • R 11 represents a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or an optionally substituted aryl group or heteroaryl group.
  • R 15 and R 16 each independently represent a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, an optionally substituted aryl group or heteroaryl group, or atomic groups necessary to form a cyclic structure together with R 15 and R 16 .
  • R 12 represents an optionally substituted aliphatic hydrocarbon group or an optionally substituted aryl group or heteroaryl group.
  • R 7 and R 9 each independently represent a hydrogen atom or an optionally substituted aliphatic hydrocarbon group.
  • R 8 represents -COO- or -COOR 8 .
  • R 8 represents a hydrogen atom, an alkali metal cation, an ammonium ion, or a mono-, di-, tri-, or tetra-alkylammonium ion.
  • R 18 represents an optionally substituted aryl group or heteroaryl group, or an ⁇ -branched aliphatic hydrocarbon group.
  • Ar 1 and Ar 2 in Formula (VI) each independently preferably represent an optionally substituted aryl group.
  • the ring represented by Ar 1 and Ar 2 is preferably a benzene ring or a naphthalene ring.
  • W 1 and W 2 each preferably represent -C(CH 3 ) 2 .
  • M 1 and M 2 preferably represent atomic groups necessary to form an optionally substituted 5-membered ring or benzene ring together.
  • M 3 and M 4 each independently preferably represent an optionally substituted aliphatic hydrocarbon group.
  • M 5 , M 6 , M 7 , and M 8 each preferably represent a hydrogen atom.
  • M 9 preferably represents -NR 5 -CO-R 4 , -NR 5 -SO 2 -R 6 , -NR 1 -SO-R 12 , or -SO 2 -NR 15 R 16 .
  • R 4 , R 5 , R 6 , R 11 , R 12 , R 15 , and R 16 have the same meaning as R 4 , R 5 , R 6 , R 11 , R 12 , R 15 , and R 16 , which are described above.
  • M 9 more preferably represents -NR 5 -CO-R 4 or -NR 5 -SO 2 -R 6 .
  • R 4 is preferably -OR 10
  • R 10 is preferably an aliphatic hydrocarbon group that may be branched.
  • R 5 is a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, or an optionally substituted aryl group or heteroaryl group
  • R 6 is an optionally substituted aliphatic hydrocarbon group or an optionally substituted aryl group or heteroaryl group.
  • M 9 optionally contains one or more counter ions to obtain an electrically neutral compound.
  • the specific infrared absorber specifically, the compound represented by Formula (VI) may be a neutral dye, an anionic dye, or a cationic dye, depending on the type of the substituent and the number of each substituent.
  • the compound represented by Formula (VI) preferably contains, in the structure, -CO 2 H, -CONHSO 2 R h , -SO 2 NHCOR 1 , -SO 2 NHSO 2 R j , -PO 3 H 2 , -OPO 3 H 2 , -OSO 3 H, -S-SO 3 H, -SO 3 H, or an anionic group or acid group of salts thereof.
  • R h , R i , and R j each independently represent an aryl group or an alkyl group, and is preferably a methyl group.
  • the salt include an alkali metal salt or an ammonium salt, and a mono-, di-, tri-, or tetra-alkylammonium salt is preferable.
  • the anionic group or acid group is preferably present on the benzene ring of Ar 1 or Ar 2 or on the aliphatic hydrocarbon group of M 3 or M 4 .
  • the benzene ring of Ar 1 or Ar 2 or the aliphatic hydrocarbon group of M 3 or M 4 in which the anionic group or acid group is present may have another substituent.
  • the other substituent can be selected from a halogen atom, a cyano group, a sulfone group, a carbonyl group, or a carboxylic acid ester group.
  • the compound represented by Formula (VI) preferably contains, on an aliphatic hydrocarbon group of M 3 or M 4 , -CO 2 H, -CONHSO 2 Me, -SO 2 NHCOMe, -SO 2 NHSO 2 , -PO 3 H 2 , -SO 3 group, or salts thereof.
  • Me represents a methyl group.
  • examples of any counter ions for obtaining an electrically neutral compound include an anion such as halogen, sulfonate, perfluorosulfonate, tosylate, tetrafluoroborate, hexafluorophosphate, aryl borate, and aryl sulfonate.
  • examples of the salt structure of the compound represented by Formula (VI) include an alkali metal salt or an ammonium salt.
  • M + is L + , Na + , K + , NH 4 + , or R 3 NH + , where R each independently represent a hydrogen atom, optionally substituted alkyl group, or an optionally substituted aryl group.
  • the content of the infrared absorber with respect to the total mass of the protective layer is preferably 1% by mass to 40% by mass, more preferably 2% by mass to 20% by mass, and even more preferably 4% by mass to 10% by mass.
  • the protective layer preferably contains a filler.
  • the filler examples include inorganic particles, organic resin particles, and an inorganic lamellar compound, and the like.
  • an inorganic lamellar compound is preferable. Using an inorganic lamellar compound makes it possible to effectively inhibit an attachment attached again from the roll surface from being directly attached to the surface of the image-recording layer.
  • examples of the inorganic particles include metal oxide particles such as silica particles.
  • organic resin particles examples include crosslinked resin particles.
  • the inorganic lamellar compound refers to particles in the form of a thin flat plate, and examples thereof include mica groups such as natural mica and synthetic mica, talc represented by Formula 3MgO ⁇ 4SiO ⁇ H 2 O, taeniolite, montmorillonite, saponite, hectorite, zirconium phosphate, and the like.
  • a mica compound is preferably used as the inorganic lamellar compound.
  • the mica compound include mica groups such as natural mica and synthetic mica, which are represented by Formula: A(B, C) 2-5 D 4 O 10 (OH, F, O) 2 [here, A represents any of K, Na, and Ca, B and C represent any of Fe (II), Fe (III), Mn, Al, Mg, and V, and D represents Si or Al.].
  • examples of the natural mica include muscovite, soda mica, phlogopite, biotite, and lepidolite.
  • examples of synthetic mica include non-swelling mica such as fluorine phlogopite KMg 3 (AlSi 3 O 10 )F 2 , potassium tetrasilic mica KMg 2.5 (Si 4 O 10 )F 2 , and, Na tetrasilylic mica NaMg 2.5 (Si 4 O 10 )F 2 , swelling mica such as Na or Li taeniolite (Na, Li)Mg 2 Li(Si 4 O 10 )F 2 , montmorillonite-based Na or Li hectorite (Na, Li) 1/8 Mg 2/5 Li 1/8 (Si 4 O 10 )F 2 .
  • synthetic smectite is also useful.
  • fluorine-based swelling mica is particularly useful. That is, swelling synthetic mica has a laminated structure consisting of unit crystal lattice layers having a thickness in a range of about 10 ⁇ to 15 ⁇ (1 ⁇ is equal to 0.1 nm), and metal atoms in lattices are more actively substituted than in any other clay minerals.
  • positive charges are deficient in the lattice layers, and positive ions such as Li + , Na + , Ca 2+ , and Mg 2+ are adsorbed between the layers in order to compensate for the deficiency.
  • Positive ions interposed between the layers are referred to as exchangeable positive ions and are exchangeable with various positive ions.
  • the positive ions between the layers are Li + and Na + , the ionic radii are small, and thus the bonds between lamellar crystal lattices are weak, and mica is significantly swollen by water. In a case where shear is applied in this state, mica easily cleavages and forms a stable sol in water. Swelling synthetic mica is particularly preferably used because it clearly exhibits such a tendency.
  • the thickness is preferably thin, and the planar size is preferably large as long as the smoothness and actinic ray-transmitting property of coated surfaces are not impaired. Therefore, the aspect ratio is preferably 20 or higher, more preferably 100 or higher, and particularly preferably 200 or higher.
  • the aspect ratio is the ratio of the major diameter to the thickness of a particle, and it can be measured, for example, from a projection view obtained from the microphotograph of the particle. As the aspect ratio increases, the obtained effect is stronger.
  • the average major diameter thereof is preferably 0.3 ⁇ m to 20 ⁇ m, more preferably 0.5 ⁇ m to 10 ⁇ m, and particularly preferably 1 ⁇ m to 5 ⁇ m.
  • the average thickness of the particles is preferably 0.1 ⁇ m or less, more preferably 0.05 ⁇ m or less, and particularly preferably 0.01 ⁇ m or less.
  • the thickness thereof is in a range of about 1 nm to 50 nm and the surface size (major diameter) is in a range of about 1 ⁇ m to 20 ⁇ m.
  • the content of the inorganic lamellar compound with respect to the total mass of the protective layer is preferably 1% by mass to 60% by mass and more preferably 3% by mass to 50% by mass. Even in a case where a plurality of kinds of inorganic lamellar compounds are used in combination, the total amount of the inorganic lamellar compounds preferable equals the content described above. In a case where the content is within the above range, the oxygen barrier property is improved, and excellent sensitivity is obtained. In addition, the deterioration of receptivity can be prevented.
  • the protective layer may contain known additives such as a plasticizer for imparting flexibility, a surfactant for improving coating property, and inorganic particles for controlling surface sliding property.
  • a plasticizer for imparting flexibility such as acrylic acid, acrylic acid, and styrene foam, and the like.
  • a surfactant for improving coating property such as silicone oils, silicone oils, and the like.
  • the oil sensitizing agent described above regarding the image-recording layer may be contained in the protective layer.
  • the protective layer is formed by known coating methods.
  • the coating amount (solid content) of the protective layer is preferably 0.01 g/m 2 to 10 g/m 2 , more preferably 0.02 g/m 2 to 3 g/m 2 , and particularly preferably 0.02 g/m 2 to 1 g/m 2 .
  • the film thickness of the protective layer in the lithographic printing plate precursor according to the present disclosure is preferably 0.1 ⁇ m to 5.0 ⁇ m and more preferably 0.3 ⁇ m to 4.0 ⁇ m.
  • the lithographic printing plate precursor according to the present disclosure may have other layers in addition to those described above.
  • a backcoat layer may be provided on a surface of the support that is opposite to the image-recording layer side.
  • the method of preparing a lithographic printing plate according to the present disclosure is not particularly limited, but it is preferable that the method of preparing a lithographic printing plate include a step of exposing the lithographic printing plate precursor in the shape of an image (exposure step) and a step of removing the image-recording layer in a non-image area by supplying at least one selected from the group consisting of a printing ink and dampening water to the lithographic printing plate precursor having undergone exposure on a printer (on-press development step).
  • the lithographic printing method preferably includes a step of exposing the lithographic printing plate precursor in the shape of an image (exposure step), a step of removing the image-recording layer in a non-image area by supplying at least one selected from the group consisting of a printing ink and dampening water on a printer to prepare a lithographic printing plate (on-press development step), and a step of performing printing by using the obtained lithographic printing plate (hereinafter, also called "printing step").
  • the method of preparing a lithographic printing plate according to the present disclosure preferably includes an exposure step of exposing the lithographic printing plate precursor in the shape of an image to form an exposed portion and a non-exposed portion.
  • the lithographic printing plate precursor according to the present disclosure is preferably exposed to a laser through a transparent original picture having a linear image, a halftone dot image, or the like or exposed in the shape of an image by laser light scanning according to digital data, or the like.
  • the wavelength of a light source to be used is preferably 750 nm to 1,400 nm.
  • a solid-state laser or a semiconductor laser that radiates infrared is suitable.
  • the output is preferably 100 mW or more
  • the exposure time per pixel is preferably 20 microseconds or less
  • the amount of irradiation energy is preferably 10 mJ/cm 2 to 300 mJ/cm 2 .
  • a multibeam laser device is preferably used.
  • the exposure mechanism may be any of an inner surface drum method, an external surface drum method, a flat head method, or the like.
  • the image exposure can be carried out by a common method using a platesetter or the like.
  • image exposure may be carried out on a printer after the lithographic printing plate precursor is mounted on the printer.
  • the method of preparing a lithographic printing plate according to the present disclosure preferably includes an on-press development step of removing the image-recording layer in a non-image area by supplying at least one selected from the group consisting of printing ink and dampening water on a printer.
  • the lithographic printing plate precursor having undergone image exposure is preferably supplied with an oil-based ink and an aqueous component on a printer such that the image-recording layer in a non-image area is removed and a lithographic printing plate is prepared.
  • the lithographic printing plate precursor is subjected to image exposure and then mounted as it is on a printer without being subjected to any development treatment, or the lithographic printing plate precursor is mounted on a printer and then subjected to image exposure on the printer, and then an oil-based ink and an aqueous component is supplied to perform printing, at the initial stage in the middle of printing, in a non-image area, by either or both of the supplied oil-based ink and the aqueous component, a non-cured image-recording layer is dissolved or dispersed to remove, and the hydrophilic surface is exposed in the non-image area.
  • the image-recording layer cured by exposure forms an oil-based ink receiving areas having a lipophilic surface in the exposed portion.
  • What is supplied first to the precursor surface may be any of the oil-based ink or the aqueous component.
  • the oil-based ink be supplied first.
  • the lithographic printing plate precursor is subjected to on-press development on a printer and used as it is for printing a number of sheets.
  • the oil-based ink and the aqueous component ordinary printing ink and ordinary dampening water for lithographic printing are suitably used.
  • the lithographic printing method according to the present disclosure includes a printing step of printing a recording medium by supplying a printing ink to the lithographic printing plate.
  • the printing ink is not particularly limited, and various known inks can be used as desired.
  • preferred examples of the printing ink include oil-based ink or ultraviolet-curable ink (UV ink).
  • dampening water may be supplied.
  • the printing step may be successively carried out after the on-press development step or the development step using a developer, without stopping the printer.
  • the recording medium is not particularly limited, and known recording media can be used as desired.
  • the entire surface of the lithographic printing plate precursor may be heated before exposure, in the middle of exposure, or during a period of time from exposure to development.
  • the lithographic printing plate precursor is heated as above, an image-forming reaction in the image-recording layer is accelerated, which can result in advantages such as improvement of sensitivity and printing durability, and stabilization of sensitivity.
  • Heating before development is preferably carried out under a mild condition of 150°C or lower. In a case where this aspect is adopted, it is possible to prevent issues such as curing of a non-image area.
  • an extremely severe condition which is preferably in a range of 100°C to 500°C. In a case where the above range is adopted, a sufficient image-strengthening action is obtained, and it is also possible to inhibit issues such as the deterioration of the support or the thermal decomposition of the image area.
  • the laminate according to the present disclosure is formed by at least laminating the lithographic printing plate precursors according to the present disclosure.
  • the laminate according to the present disclosure is preferably formed by laminating the lithographic printing plate precursors according to the present disclosure and preferably has a protective material that protects the lithographic printing plate precursor disposed on at least the uppermost portion of the laminated lithographic printing plate precursors, and a moisture content of the protective material is preferably 10% or less.
  • the lithographic printing plate precursor is in the form of one sheet of thin plate adopting a metal as a support. Therefore, in a case where scratches or deformation occurs in the corners, sides, inside, or the like of the lithographic printing plate precursor, unfortunately, images are likely to be blurred by photosensitization, or ink is likely to be non-uniformly distributed by printing.
  • the protective material is disposed between a predetermined number of the precursors such that the precursors are reliably protected.
  • the precursors between which the protective material is disposed are packaged as they are with a packaging material to prepare a packaged substance, and handled (transported, stored, or the like).
  • deformation such as bending
  • the external force is partially absorbed into the protective material, which prevents deformation or scratches of the precursor.
  • Preferred aspects of the lithographic printing plate precursor in the laminate according to the present disclosure is the same as the preferred aspects of the lithographic printing plate precursor according to the present disclosure described above.
  • the laminate according to the present disclosure preferably has a protective material that protects the lithographic printing plate precursor disposed on at least the uppermost portion of the laminated lithographic printing plate precursors, and a moisture content of the protective material is preferably 10% by mass or less.
  • the moisture content of the protective material is preferably 10% by mass or less, more preferably 7% by mass or less, and particularly preferably 3% by mass or less.
  • the lower limit of the moisture content is 0% by mass.
  • the moisture content (equilibrium moisture content) of the protective material in the present disclosure is measured by the measuring method according to JIS P 8202 (1998).
  • Examples of the material of the protective material include thick paper, cardboard, plastic, and the like. Among these, from the viewpoint of development defect suppressiveness, cardboard or plastic is preferable, and plastic is more preferable.
  • plastic a known polymer can be used, and examples thereof include polyester, polycarbonate, and polyolefin. Among these, polyester is preferable.
  • the size (length ⁇ width) of the protective material is not particularly limited and can be appropriately selected depending on the lithographic printing plate precursor to be used.
  • the size of the protective material is the same as or slightly larger than the size of the lithographic printing plate precursor.
  • the thickness of the protective material is not particularly limited. From the viewpoint of strength, moisture permeability, and development defect suppressiveness, the thickness of the protective material is preferably 10 ⁇ m to 10 mm and more preferably 100 ⁇ m to 5 mm.
  • the protective material be disposed not only in the uppermost portion of the laminate but also in the lowermost portion.
  • the laminate according to the present disclosure may have interleaving paper between two laminated lithographic printing plate precursors.
  • the interleaving paper may be between the lithographic printing plate precursor and the protective material.
  • the interleaving paper may be in the lowermost portion of the laminate.
  • the material of the interleaving paper used in the present disclosure it is preferable to select low-cost raw materials as the material of the interleaving paper used in the present disclosure.
  • low-cost raw materials for example, it is possible to use paper using wood pulp 100% by mass, paper using wood pulp together with synthetic pulp, paper composed of the above paper and a low-density or high-density polyethylene layer provided on the surface of the paper, and the like.
  • examples thereof include acidic paper made of paper stock prepared by adding a sizing agent and a paper strengthening agent to paper stock obtained by beating bleached kraft pulp and then diluting the beaten pulp to a concentration of 4% by mass such that the amounts of the sizing agent and paper strengthening agent are 0.1% by mass and 0.2% by mass respectively with respect to the mass of the paper stock and then adding aluminum sulfate thereto until the pH reaches 5.0.
  • alkaline paper having a pH of 7 to 8 in which a neutral sizing agent, such as an alkyl ketene dimer (AKD) or an alkenyl succinic anhydride (ASA), is used as a sizing agent and calcium carbonate is used as a filler instead of aluminum sulfate.
  • a neutral sizing agent such as an alkyl ketene dimer (AKD) or an alkenyl succinic anhydride (ASA)
  • ASA alkenyl succinic anhydride
  • interleaving paper among these, paper is preferable, paper containing aluminum sulfate or calcium carbonate is more preferable, and paper containing calcium carbonate is particularly preferable.
  • the material of the interleaving paper is preferably paper containing 50% by mass or more of pulp, more preferably paper containing 70% by mass or more of pulp, and particularly preferably paper containing 80% by mass or more of pulp.
  • the calcium content with respect to the total mass of the interleaving paper is preferably 0.15% by mass to 0.5% by mass, more preferably 0.2% by mass to 0.45% by mass, and particularly preferably 0.25% by mass to 0.4% by mass.
  • the calcium content of the interleaving paper is obtained by performing X-ray fluorescence spectrometry on the interleaving paper.
  • the calcium contained in paper is mainly calcium carbonate which is widely used as a filler for alkaline paper, and performs an action of increasing whiteness of the paper.
  • the basis weight of the interleaving paper is not particularly limited, but from the viewpoints of printing durability and on-press developability, is preferably 29 g/m 2 to 80 g/m 2 , more preferably 35 g/m 2 to 70 g/m 2 , and particularly preferably 51 g/m 2 to 65 g/m 2 .
  • the basis weight of the interleaving paper is preferably 51 g/m 2 or more.
  • the thickness of the interleaving paper is not particularly limited, but is preferably 20 ⁇ m to 100 ⁇ m, more preferably 42 ⁇ m to 80 ⁇ m, even more preferably 45 ⁇ m to 65 ⁇ m, and particularly preferably 45 ⁇ m to 55 ⁇ m.
  • the moisture amount of the interleaving paper (moisture amount of the interleaving paper stored at 25°C/50% RH until the moisture amount of the interleaving paper is stabilized) with respect to the total mass of the interleaving paper is preferably 0% by mass to 20% by mass, more preferably 0% by mass to 15% by mass, and particularly preferably 0% by mass to 10% by mass.
  • the interleaving paper described in JP2010-76336A can be suitably used.
  • the shape of the interleaving paper is not particularly limited, and examples thereof include a shape which is the same as or larger than the shape of the lithographic printing plate precursor in the plane direction.
  • the laminate according to the present disclosure may be entirely packaged by a known method.
  • the molecular weight of a high-molecular-weight compound is a weight-average molecular weight (Mw), and the ratio of repeating constitutional units of a polymer compound is expressed as molar percentage.
  • Mw weight-average molecular weight
  • the weight-average molecular weight (Mw) is a polystyrene-equivalent molecular weight measured by gel permeation chromatography (GPC).
  • a pumice suspension (specific gravity: 1.1 g/cm 3 ) as an abrasive slurry was supplied to the surface of an aluminum plate, and in this state, a mechanical roughening treatment is performed using a rotating bundled brush.
  • 1 represents an aluminum plate
  • 2 and 4 represent roller-shaped brushes (bundled brushes in the present example)
  • 3 represents an abrasive slurry
  • 5, 6, 7, and 8 represent support rollers.
  • an abrasive having a median diameter ( ⁇ m) of 30 ⁇ m and 4 brushes were used, and the rotation speed (rpm) of the brushes was set to 250 rpm.
  • the bundled brush was made of 6 -10 nylon and consisted of bristles having a diameter of 0.3 mm and a length of 50 mm.
  • the brush was prepared by making holes in a ⁇ 300 mm stainless steel cylinder and densely implanting bristles therein. The distance between two support rollers ( ⁇ 200 mm) under the bundled brush was 300 mm.
  • the bundled brush was pressed until the load of the drive motor for rotating the brush was 10 kW higher than the load applied before the bundled brush was pressed on the aluminum plate.
  • the rotation direction of the brush was the same as the moving direction of the aluminum plate.
  • An aqueous solution of caustic soda having a caustic soda concentration of 26% by mass and an aluminum ion concentration of 6.5% by mass was sprayed from a spray tube onto the aluminum plate obtained above at a temperature of 70°C, thereby performing an etching treatment. Then, rinsing was performed by means of spraying. The amount of dissolved aluminum was 10 g/m 2 .
  • a desmutting treatment was performed in an aqueous nitric acid solution.
  • the aqueous nitric acid solution used in the desmutting treatment the waste liquid of nitric acid used in the next step, electrochemical roughening, was used.
  • the liquid temperature was 35°C.
  • the desmutting treatment was performed for 3 seconds by spraying the desmutting liquid.
  • An electrochemical roughening treatment was continuously performed using nitric acid as an electrolyte at an alternating current voltage of 60 Hz.
  • an electrolytic solution was used which was prepared by adding aluminum nitrate to 10.4 g/L aqueous nitric acid solution at a temperature of 35°C such that the aluminum ion concentration was adjusted to 4.5 g/L.
  • an alternating current power source having the waveform shown in Fig. 1 , alternating current having a trapezoidal rectangular waveform, and a carbon electrode as a counter electrode, an electrochemical roughening treatment was performed under the conditions of a time tp taken for the current value to reach the peak from zero of 0.8 msec and the duty ratio of 1:1.
  • ferrite As an auxiliary anode, ferrite was used.
  • the electrolytic cell shown in Fig. 2 was used.
  • the peak current density was 30 A/dm 2 , and 5% of the current coming from the power source was allowed to flow into the auxiliary anode.
  • the electricity quantity (C/dm 2 ) was 185 C/dm 2 , which is the total quantity of electricity used during the anodic reaction of the aluminum plate. Then, rinsing was performed by means of spraying.
  • An aqueous solution of caustic soda having a caustic soda concentration of 5% by mass and an aluminum ion concentration of 0.5% by mass was sprayed from a spray tube onto the aluminum plate obtained above at a temperature of 50°C, thereby performing an etching treatment. Then, rinsing was performed by means of spraying. The amount of dissolved aluminum was 0.5 g/m 2 .
  • a desmutting treatment was performed in an aqueous sulfuric acid solution.
  • an aqueous sulfuric acid solution having a sulfuric acid concentration of 170 g/L and an aluminum ion concentration of 5 g/L was used.
  • the liquid temperature was 30°C.
  • the desmutting treatment was performed for 3 seconds by spraying the desmutting liquid.
  • An electrochemical roughening treatment was continuously performed using hydrochloric acid as an electrolyte at an alternating current voltage of 60 Hz.
  • An electrolytic solution was used which was prepared by adding aluminum chloride to 6.2 g/L aqueous hydrochloric acid solution at a liquid temperature of 35°C such that the aluminum ion concentration was adjusted to 4.5 g/L.
  • an alternating current power source having the waveform shown in Fig. 1 , alternating current having a trapezoidal rectangular waveform, and a carbon electrode as a counter electrode
  • an electrochemical roughening treatment was performed under the conditions of a time tp taken for the current value to reach the peak from zero of 0.8 msec and the duty ratio of 1:1.
  • ferrite was used as an auxiliary anode.
  • the electrolytic cell shown in Fig. 2 was used.
  • the peak current density was 25 A/dm 2
  • the electricity quantity (C/dm 2 ) during the hydrochloric acid electrolysis was 63 C/dm 2 which is the total quantity of electricity used during the anodic reaction of the aluminum plate. Then, rinsing was performed by means of spraying.
  • An aqueous solution of caustic soda having a caustic soda concentration of 5% by mass and an aluminum ion concentration of 0.5% by mass was sprayed from a spray tube onto the aluminum plate obtained above at a temperature of 50°C, thereby performing an etching treatment. Then, rinsing was performed by means of spraying. The amount of dissolved aluminum was 0.1 g/m 2 .
  • a desmutting treatment was performed in an aqueous sulfuric acid solution. Specifically, by using a waste liquid generated in the anodization treatment step (170 g/L aqueous sulfuric acid solution containing dissolved aluminum ions at 5 g/L), the desmutting treatment was performed for 4 seconds at a liquid temperature of 35°C. The desmutting treatment was performed for 3 seconds by spraying the desmutting liquid.
  • a first-stage anodization treatment was performed.
  • the anodization treatment was performed under the conditions shown in Table 1, thereby forming an anodic oxide film having a predetermined film thickness.
  • an aluminum plate 616 is transported as indicated by the arrow in Fig. 4 .
  • a power supply tank 612 containing an electrolytic solution 618 the aluminum plate 616 is positively (+) charged by a power supply electrode 620.
  • the aluminum plate 616 is transported upwards by a roller 622 in the power supply tank 612, makes a turn downwards by a nip roller 624, then transported toward an electrolytic treatment tank 614 containing an electrolytic solution 626, and makes a turn by a roller 628 to move in the horizontal direction.
  • the aluminum plate 616 is negatively (-) charged by an electrolysis electrode 630.
  • an anodic oxide film is formed on the surface of the aluminum plate 616.
  • the aluminum plate 616 exits from the electrolytic treatment tank 614 and is then transported for the next step.
  • the roller 622, the nip roller 624, and the roller 628 constitute a direction change unit.
  • the aluminum plate 616 is transported in a ridge shape and an inverted U shape by the rollers 622, 624, and 628.
  • the power supply electrode 620 and the electrolysis electrode 630 are connected to a direct current power source 634.
  • the aluminum plate having undergone the above anodization treatment was immersed in an aqueous solution of caustic soda at a temperature of 35°C and having a caustic soda concentration of 5% by mass and an aluminum ion concentration of 0.5% by mass, thereby performing a pore widening treatment. Then, rinsing was performed by means of spraying.
  • anodization device for direct current electrolysis having the structure shown in Fig. 4 .
  • the anodization treatment was performed under the conditions shown in Table 1, thereby forming an anodic oxide film having a predetermined film thickness.
  • anodization device for direct current electrolysis having the structure shown in Fig. 4 .
  • the anodization treatment was performed under the conditions shown in Table 1, thereby forming an anodic oxide film having a predetermined film thickness.
  • Table 2 shows the average diameter (nm) of the large diameter portion in the anodic oxide film within the surface of the anodic oxide film having micropores obtained after the second anodization treatment step, the average diameter (nm) of the small diameter portion at a communicate position, the depth (nm) of the large diameter portion and the small diameter portion, the pit density (micropore density, unit; number of micropores/ ⁇ m 2 ), and the thickness (nm) of the anodic oxide film from the bottom portion of the small diameter portion to the surface of the aluminum plate.
  • the depth of the micropores is a value obtained by observing the cross section of the support (anodic oxide film) with FE-SEM (observation of the depth of the large diameter portion: 150,000X magnification, observation of depth of small diameter portion: 50,000X magnification), measuring the depths of 25 random micropores in the obtained image, and calculating the average thereof.
  • film amount (AD) in the column of the first anodization treatment and film amount (AD) in the column of second anodization treatment represent the amount of film obtained by each treatment.
  • electrolytic solutions the aqueous solutions containing the components in Table 1 were used.
  • an undercoat layer, an image-recording layer, and a protective layer were formed as follows to obtain a lithographic printing plate precursor.
  • the obtained support A was coated with the undercoat layer coating liquid having the following composition such that the dry coating amount was 0.1 g/m 2 , to form an undercoat layer.
  • the undercoat layer 1 was bar-coated with the image-recording layer coating liquid, followed by drying in an oven at 120°C for 60 seconds, thereby forming an image-recording layer having a dry coating amount of 1.0 g/m 2 .
  • the following components were dissolved in a mixed solution of 35% by volume methyl ethyl ketone (MEK) and 65% by volume 1-methoxy-2-propanol at a solid content concentration of 7.0% by mass to prepare the image-recording layer coating liquid 1.
  • MEK methyl ethyl ketone
  • the infrared absorber contained in the image-recording layer is as follows.
  • IR-4 is a salt of a cationic moiety of the infrared absorber and a borate anion (tetraphenyl borate anion).
  • D1 to D31 in the compound A contained in the image-recording layer are the same compounds as D1 to D31 in the specific examples of the cations of the compound A described above.
  • the acid generator C-1 contained in the image-recording layer is a compound having the following structure.
  • a protective layer was formed on the image-recording layer by the following forming method.
  • Example 94 to 97 the protective layer was not formed.
  • the image-recording layer was bar-coated with the following coating liquid for a protective layer and dried in an oven at 110°C for 120 seconds, thereby forming a protective layer having a dry coating amount of 0.3 g/m 2 .
  • a lithographic printing plate precursor was prepared.
  • the following components were mixed together, thereby preparing a coating liquid for a protective layer.
  • the obtained lithographic printing plate precursor was come into contact with the rubber roller (diameter 2 cm) from the protective layer side, and pressured.
  • the lithographic printing plate precursor after applying the contact pressure was stored for 3 days in a saturated atmosphere of 2-methoxypropanol using a vapor chamber. After storage for 3 days, the image-recording layer of the lithographic printing plate precursor was observed at 8X optical magnification, and the precipitates in the layers were evaluated.
  • the obtained lithographic printing plate precursor was exposed at a condition of 2400 dpi and an energy density of 90 mJ/cm 2 using an Avalon N8-20 platesetter (200 Ipi Agfa Balancing Screening (ABS), manufactured by Agfa-Gevaert NV) with a 830 nm infrared laser.
  • Avalon N8-20 platesetter 200 Ipi Agfa Balancing Screening (ABS), manufactured by Agfa-Gevaert NV) with a 830 nm infrared laser.
  • the obtained exposed lithographic printing plate precursor was attached to the plate cylinder of the printer (manufactured by RYOBI LIMITED) without performing a development treatment.
  • 50,000 sheets of printing were performed using non-coated offset paper (70 g) and a compressible blanket.
  • TOYO FD LED UV EU3 cyan ink and a 3% by mass Prima AF S1 (manufactured by Agfa) aqueous solution as dampening water were used.
  • the printing durability was evaluated using the number of printed sheets at a time when the reduction rate of the halftone portion density exceeded 8% with respect to the halftone portion density of the initial printed matter.
  • the halftone portion density was measured using the Gretag macbeth densitometer.
  • the lithographic printing plate precursors according to examples have excellent crystal precipitation suppressiveness, and further have excellent printing durability, compared to the lithographic printing plate precursors according to comparative examples.

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  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials For Photolithography (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
EP23204033.7A 2022-10-25 2023-10-17 Précurseur de plaque d'impression lithographique, procédé de préparation de plaque d'impression lithographique et procédé d'impression lithographique Pending EP4360880A1 (fr)

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