WO2020004035A1 - Précurseur positif de plaque d'impression lithographique, procédé de production de plaque d'impression lithographique et composition de résine photosensible positive - Google Patents

Précurseur positif de plaque d'impression lithographique, procédé de production de plaque d'impression lithographique et composition de résine photosensible positive Download PDF

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Publication number
WO2020004035A1
WO2020004035A1 PCT/JP2019/023255 JP2019023255W WO2020004035A1 WO 2020004035 A1 WO2020004035 A1 WO 2020004035A1 JP 2019023255 W JP2019023255 W JP 2019023255W WO 2020004035 A1 WO2020004035 A1 WO 2020004035A1
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Prior art keywords
group
printing plate
structural unit
acid
lithographic printing
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PCT/JP2019/023255
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English (en)
Japanese (ja)
Inventor
一郎 小山
加奈 栢木
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富士フイルム株式会社
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Publication of WO2020004035A1 publication Critical patent/WO2020004035A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
    • B41N1/14—Lithographic printing foils
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
    • G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
    • G03F7/095—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having more than one photosensitive layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor

Definitions

  • the present disclosure relates to a positive planographic printing plate precursor, a method for preparing a planographic printing plate, and a positive photosensitive resin composition.
  • a lithographic printing plate is composed of an oleophilic image area that receives ink during the printing process and a hydrophilic non-image area that receives fountain solution.
  • Lithographic printing utilizes the property that water and oil-based ink repel each other, so that the lipophilic image portion of the lithographic printing plate is an ink receiving portion and the hydrophilic non-image portion is a dampening water receiving portion (ink non-receiving portion).
  • a difference in ink adhesion is caused on the surface of a lithographic printing plate, the ink is applied only to an image portion, and then the ink is transferred to a printing medium such as paper to perform printing.
  • Such a lithographic printing plate includes, for example, a support, and a photosensitive resin composition containing a polymer compound and a solvent, coated on the support, and an image recording layer formed on the support by a method such as drying. And by developing a lithographic printing plate precursor having: As compositions used in the production of conventional lithographic printing plate precursors, for example, those described in Patent Documents 1 to 3 are known.
  • a resin layer and a heat-sensitive layer are sequentially coated on the upper surface of a support having a hydrophilic surface, the resin layer contains an alkali-soluble resin, the heat-sensitive layer contains an alkali-soluble resin and an infrared absorber, Contains an alkali-soluble resin and an infrared absorber.
  • the alkali-soluble resin contains an acrylic resin having a side chain structure of -L1-L2-R, in which one of L1 and L2 is -HN-, and the other is Is —CH 2 —, and R is any one of H, an alkyl group, a phenyl group, and a substituted phenyl group.
  • Patent Document 2 contains at least (A) an alkali water-soluble polymer compound having an aliphatic amine structure or an aromatic amine structure, and (B) an infrared absorber, and has a solubility in an alkali developer by infrared irradiation.
  • An image recording material characterized by increasing is disclosed.
  • Patent Document 3 discloses (A) a first alkaline aqueous solution-soluble resin having a hydrophobic aminoalkyl group represented by the following general formula (1) in a side chain, (B) a second alkaline aqueous solution-soluble resin, and ( C) A photosensitive composition characterized by containing an infrared absorber is disclosed.
  • Z 1 , Z 2 , and Z 3 each independently represent a hydrogen atom or a monovalent substituent composed of a nonmetallic atom.
  • Patent Literature 1 Chinese Patent Application Publication No. 102248845
  • Patent Literature 2 JP-A-2000-356851
  • Patent Literature 3 JP-A-2007-10906
  • ablation may occur when exposed during image formation.
  • Ablation refers to a phenomenon in which the image recording layer expands explosively due to heat generated during exposure, and is volatilized or decomposed and removed.
  • a problem such as contamination of the optical system by a scattered matter such as a component of the image recording layer may occur. Therefore, in the positive type lithographic printing plate precursor, suppression of ablation at the time of exposure has been required. In the present disclosure, such a property that ablation is easily suppressed is also referred to as being excellent in ablation suppression.
  • the problem to be solved by the embodiment of the present disclosure is to provide a positive lithographic printing plate precursor excellent in ablation suppression, and a positive photosensitive resin composition, and lithographic printing using the positive lithographic printing plate precursor. It is to provide a method for producing a plate.
  • Means for solving the above problems include the following aspects. ⁇ 1> having a support, and an image recording layer formed on the support, The image recording layer, A structural unit having an acid group having a pKa of 7 or less and a structural unit having a base group, wherein at least one of the acid group of the structural unit having the acid group and the basic group of the structural unit having the base group is a linking group.
  • a binder polymer which is an addition polymerization type resin bonded to the main chain through An infrared absorber, Positive lithographic printing plate precursor.
  • ⁇ 3> The positive lithographic printing plate precursor as described in ⁇ 1> or ⁇ 2> above, wherein the pKaH of the base group is 9 or less.
  • ⁇ 4> The positive lithographic printing plate precursor as described in any one of ⁇ 1> to ⁇ 3> above, wherein the acid group has a pKa of 5.5 or less.
  • ⁇ 5> The positive lithographic printing plate precursor as described in any one of ⁇ 1> to ⁇ 4> above, wherein a chain length between the acid group or the base group and the main chain has 3 or more atoms.
  • ⁇ 6> The positive lithographic printing plate precursor according to any one of ⁇ 1> to ⁇ 5>, wherein the acid group is a carboxy group, and the base group is a tertiary amino group or a pyridyl group.
  • the binder polymer is an acrylic resin.
  • the binder polymer has a weight average molecular weight of 8,000 to 20,000.
  • R 1 represents a hydrogen atom or a methyl group
  • X 1 represents a single bond, an ester bond or an amide bond
  • L 1 represents a single bond or a divalent linking group
  • Acid has a pKa of 7 or less.
  • R 2 represents a hydrogen atom or a methyl group
  • X 2 represents a single bond, an ester bond or an amide bond
  • L 2 represents a single bond or a divalent linking group
  • Base represents a base group
  • L is the atoms contained in the 2 and Base may form a ring
  • the structural unit represented by the formula A1 is a structural unit represented by the following formula a
  • the structural unit represented by the formula B1 is a structural unit represented by the following formula b.
  • R 3 represents a hydrogen atom or a methyl group
  • X 3 represents —O— or —NR 7 —
  • R 7 represents a hydrogen atom or an alkyl group
  • L 3 represents a single bond or a carbon atom.
  • * represents a binding site to another structure independently of each other.
  • R 4 represents a hydrogen atom or a methyl group
  • X 4 represents —O— or —NR 8 —
  • R 8 represents a hydrogen atom or an alkyl group
  • L 4 , R 5 and R 6 And at least two of them may combine to form a ring
  • L 4 represents a single bond or a divalent hydrocarbon group having 1 or more carbon atoms
  • R 5 and R 6 each independently represent a carbon atom It represents one or more monovalent hydrocarbon groups
  • * independently represents a binding site to another structure.
  • ⁇ 11> A group in which the image recording layer is formed of a phenol resin, a styrene-acrylonitrile copolymer, an acrylic resin, an acetal resin, and a resin having a urea bond, a urethane bond, or an amide bond in a main chain as another binder polymer.
  • the positive type lithographic printing plate precursor described in. ⁇ 13> an exposure step of image-exposing the positive type lithographic printing plate precursor according to any one of the above ⁇ 1> to ⁇ 12>, and A method for preparing a lithographic printing plate, comprising, in this order, a developing step of developing the exposed positive type lithographic printing plate precursor using a developing solution having a pH of 10.0 or less.
  • a positive lithographic printing plate precursor excellent in ablation suppression, and a positive photosensitive resin composition and a method of preparing a lithographic printing plate using the positive lithographic printing plate precursor. Provided.
  • the amount of each component in the composition, when there are a plurality of substances corresponding to each component in the composition, unless otherwise specified, the total amount of the corresponding plurality of substances present in the composition Means Further, in the notation of a group (atomic group) in the present disclosure, the notation of not indicating substituted or unsubstituted includes not only a group having no substituent but also a group having a substituent.
  • the “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 as a concept including both acryl and methacryl
  • (meth) acryloyl is a term used as a concept including both acryloyl and methacryloyl. is there.
  • the notation of a group in the compound represented by the formula when substituted or unsubstituted is not described, when the group can further have a substituent, there is no particular definition.
  • the group includes not only an unsubstituted group but also a group having a substituent.
  • R represents an alkyl group, an aryl group or a heterocyclic group
  • R represents an unsubstituted alkyl group, a substituted alkyl group, an unsubstituted aryl group, a substituted aryl group, an unsubstituted group
  • the term “step” in the present disclosure is not limited to an independent step, and is included in the term even if it cannot be clearly distinguished from other steps as long as the intended purpose of the step is achieved. It is.
  • “mass%” and “weight%” are synonymous, and “mass part” and “weight part” are synonymous.
  • TSKgel GMHxL TSKgel G4000HxL
  • TSKgel G2000HxL all trade names manufactured by Tosoh Corporation
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • the molecular weight was determined using a gel permeation chromatography (GPC) analyzer and using a solvent THF (tetrahydrofuran) and a differential refractometer, and converted using polystyrene as a standard substance.
  • GPC gel permeation chromatography
  • the total solid content means the total mass of components excluding volatile components such as solvents in the composition.
  • the term “lithographic printing plate precursor” includes not only the lithographic printing plate precursor but also a discarded plate precursor.
  • the term “lithographic printing plate” includes not only a lithographic printing plate precursor but also a lithographic printing plate produced through operations such as exposure and development, if necessary, as well as a discarded plate. In the case of a discarded plate master, the operations of exposure and development are not necessarily required.
  • the discarded plate is a planographic printing plate precursor to be attached to a plate cylinder that is not used, for example, when printing a part of the paper surface in a single color or two colors in color newspaper printing.
  • the “main chain” represents a relatively longest binding chain in the molecule of the polymer compound constituting the resin
  • the “side chain” represents an atomic group branched from the main chain.
  • the present disclosure will be described in detail.
  • a positive planographic printing plate precursor according to the present disclosure has a support, and an image recording layer formed on the support, and the image recording layer has an acid group having a pKa of 7 or less. And a structural unit having a base group, wherein at least one of the acid group of the structural unit having the acid group and the base group of the structural unit having the base group is bonded to the main chain via a linking group.
  • specific binder polymer also referred to as “specific binder polymer”
  • the positive type lithographic printing plate precursor according to the present disclosure is also simply referred to as “lithographic printing plate precursor”.
  • the image recording layer in the lithographic printing plate precursor according to the present disclosure contains a specific binder polymer.
  • the mechanism by which ablation during exposure is suppressed is not clear, but is presumed as follows.
  • the interaction between the binder polymers is enhanced by the formation of the salt by the acid group and the base group contained in the specific binder polymer. Therefore, it is assumed that ablation due to heat generated at the time of exposure is suppressed.
  • the salt is thermally decomposed, so that it is considered that an acid group is generated in the binder polymer and the binder polymer can be dissolved.
  • the lithographic plate according to the present disclosure is formed by the strong interaction between the binder polymers due to the formation of the salt, and by improving the coating property of the image recording layer due to the formation of the salt.
  • the lithographic printing plate obtained by exposing and developing the printing plate precursor is considered to have excellent printing durability.
  • the specific binder polymer in the lithographic printing plate precursor according to the present disclosure has a strong acid group having a pKa of 7 or less, the exposed portion (non-image portion) is easily excellent in solubility (developability) in a developing solution. it is conceivable that. Further, it is considered that the development using a developer having a relatively low pH (for example, 10 or less) is easily performed by having the strong acid group.
  • the strong acid group forms a salt in the non-image area
  • penetration of the alkali developing solution, dissolution and dispersion of the binder polymer in the developing solution, and the like are suppressed, and the alkali developing solution in the unexposed area is reduced. Is thought to be likely to have low solubility.
  • the solubility in the alkali developing solution is easily excellent in the image portion, and the solubility in the alkali developing solution is easily lowered in the non-image portion. .
  • the binder polymer after the salt in the exposed portion is thermally decomposed is a binder polymer having a strong acid group and has relatively high polarity, and thus it is considered that generation of development scum by development is likely to be suppressed. Further, it is considered that the transfer of the components in the image recording layer to the interleaving paper when the planographic printing plate precursors are stacked is likely to be suppressed by improving the coating property.
  • interleaving paper is used to prevent accumulation of the lithographic printing plate precursors, prevent adhesion of the lithographic printing plate precursors, and prevent lithographic printing plates from being stored and transported as a laminate of a plurality of lithographic printing plate precursors.
  • the slip sheet a known slip sheet such as paper or a resin film can be used. Further, it is considered that, by improving the coating property, the image recording layer in the lithographic printing plate precursor and the scratch resistance of the image portion in the obtained lithographic printing plate, and the chemical resistance to a cleaner for removing stains and the like are also likely to be improved. .
  • the details of each component included in the positive planographic printing plate precursor according to the present disclosure will be described.
  • the lithographic printing plate precursor according to the present disclosure has an image recording layer.
  • the image recording layer according to the present disclosure can be formed, for example, by applying a positive photosensitive resin composition according to the present disclosure described later on a support and drying the composition, if necessary.
  • the drying method is not particularly limited, and includes natural drying, air drying, drying by heating, and the like.
  • the image recording layer in the present disclosure includes a specific binder polymer and an infrared absorber.
  • the image recording layer in the present disclosure contains a specific binder polymer.
  • the specific binder polymer is an addition polymerization type resin, and from the viewpoint of printing durability and ease of production, a resin obtained by polymerizing an ethylenically unsaturated compound (that is, a polymer of a monomer having an ethylenically unsaturated double bond) Is preferable, and an acrylic resin is more preferable.
  • the acrylic resin a resin having a content of a structural unit formed of a (meth) acrylic compound of 50% by mass or more is preferable.
  • the specific binder polymer includes a structural unit having an acid group and a structural unit having a basic group, and at least one of the acid group of the structural unit having the acid group and the basic group of the structural unit having the base group is linked.
  • the acid group is bonded to the main chain through a group, and has a pKa of 7 or less. That is, the acid group and the base group in the specific binder polymer are contained in different monomer units from the viewpoint of ablation suppression.
  • the acid group and the base group may form a salt between molecules or within the molecule.
  • the specific binder polymer is preferably an alkali-soluble resin, and more preferably a weak alkali-soluble resin soluble in weak alkali.
  • alkali-soluble refers to being soluble in a 1 mol / l sodium hydroxide solution at 25 ° C
  • weakly alkaline-soluble refers to a 0.0001 mol / l sodium hydroxide solution (pH 10) at 25 ° C. It means that it is soluble.
  • the term "soluble" means that 0.1 g or more is dissolved in 100 mL of a solvent.
  • the specific binder polymer includes a structural unit having an acid group having a pKa of 7 or less.
  • the acid group is usually introduced into the specific binder polymer as a structural unit containing an acid group using a monomer capable of forming an acid group.
  • the pKa of the acid group is 7 or less, and is preferably 6 or less, more preferably 5.5 or less from the viewpoint of developability.
  • the lower limit of the pKa of the acid group is not particularly limited, but is preferably -5 or more.
  • the pKa in the present disclosure is calculated using ACD / pKa DB ver 8.07 of ACD / Labs software Ver 8.0 for Microsoft windows manufactured by Advanced Chemistry Development.
  • the acid group having a pKa of 7 or less in the specific binder polymer is not particularly limited, and examples thereof include a carboxy group, a sulfo group, a phosphoric acid group, a phosphonic acid group, and a sulfate group. From a viewpoint, a carboxy group is preferable. Further, a sulfonamide group (—SO 2 —NH— or —SO 2 —NH 2 ), a phenolic hydroxyl group and the like are usually not included in the above acid groups in the binder polymer because the pKa usually exceeds 7.
  • the specific binder polymer may further have an acid group having a pKa of more than 7, but the content of the acid group having a pKa of more than 7 is preferably 0.1 mol / g or less from the viewpoint of developability. , 0.01 mol / g or less.
  • the ClogP value of the structural unit having an acid group is preferably from 0.3 to 5, more preferably from 1.0 to 4.0, from the viewpoints of developability, printing durability, and ink adhesion. , 2.0 to 3.8.
  • the ClogP value is a value obtained by calculating a common logarithm logP of a partition coefficient P to 1-octanol and water. Known methods and software can be used for calculating the ClogP value. Unless otherwise specified, the present disclosure uses a ClogP program incorporated in ChemBioDraw Ultra 12.0 of Cambridge software.
  • the ClogP value is calculated by substituting a hydrogen atom for a connecting site (that is, * in the following structural units) of a structural unit having an acid group (preferably, a monomer unit). For example, when calculating the ClogP value of the following structural unit UA-1, the ClogP value is calculated after conversion into the following structural unit UA′-1.
  • the acid value of the specific binder polymer is preferably from 1.5 meq / g to 1.9 meq / g, more preferably from 1.5 meq / g to 1.75 meq / g.
  • the acid value of the specific binder polymer is represented by the number of moles of potassium hydroxide required to neutralize 1 g of the specific binder polymer, and a value obtained by a measurement method according to JIS standard (JIS K0070: 1992) may be used. it can.
  • the specific binder polymer contains a structural unit having a basic group.
  • the basic group is usually introduced into the specific binder polymer as a structural unit containing the basic group using a monomer capable of forming the basic group.
  • the pKaH of the basic group is preferably 4 or more, more preferably 5 or more, and even more preferably 8 or more, from the viewpoint of developability.
  • the upper limit of the pKaH of the basic group is not particularly limited, but is preferably 12 or less, more preferably 9 or less.
  • the pKaH of the base group means the pKa of the acid conjugated to the base group.
  • PKaH in the present disclosure is calculated using ACD / pKa DB ver 8.07 of ACD / Labs software Ver 8.0 for Microsoft windows manufactured by Advanced Chemistry Development.
  • the base group in the specific binder polymer is not particularly limited, and includes an amino group, an aromatic ring containing a nitrogen atom, and the like.From the viewpoints of printing durability, ablation suppression, and developability, a tertiary amino group or a pyridyl group is used. Is more preferable. Further, in the specific binder polymer, it is preferable that the acid group is a carboxy group and the base group is a tertiary amino group or a pyridyl group from the viewpoints of printing durability, abrasion suppressing property and developability.
  • the ClogP value of the structural unit having a basic group is preferably from -1.0 to 10, and more preferably from 1.0 to 5.0, from the viewpoints of developability, printing durability and ink adhesion. preferable.
  • the ClogP value of the structural unit having a basic group can be determined by the same method as the ClogP value of the structural unit having an acid group described above. For example, when calculating the ClogP value of the following structural unit UB-1, the ClogP value is calculated after conversion into the following structural unit UB'-1.
  • the base number of the specific binder polymer is preferably from 1.5 meq / g to 1.9 meq / g, more preferably from 1.5 meq / g to 1.75 meq / g.
  • the base number of the specific binder polymer means a base number by a perchloric acid method defined by JIS K2501 (2003). The base number is obtained as the number of milligrams (mg) of hydrochloric acid or perchloric acid and an equivalent of potassium hydroxide required to neutralize all the basic components contained in 1 g of a sample.
  • the acid / base ratio in the specific binder polymer is preferably from 0.90 / 1.0 to 1.0 / 0.90, more preferably from 0.95 / 1.0 to 1.0 / 0.95. preferable.
  • the acid / base ratio is a value represented by the number of moles of acid groups / the number of moles of base groups in the specific binder polymer.
  • the chain length between the acid group or the base group and the main chain is preferably 3 or more atoms from the viewpoint of ablation suppression and developability, and the acid group or the base group and the main chain Is more preferably 5 or more atoms.
  • the chain length between the acid group or the base group and the main chain is a value obtained by counting the number of atoms of the main chain in the specific binder polymer and the side chain connecting the acid group or the base group so as to be minimum.
  • the atoms contained in the main chain are not included in the chain length.
  • the alkyl chain is preferably a branched or linear saturated alkyl chain, and more preferably a linear alkyl chain, from the viewpoint that the acid group and the base group contained in the specific binder polymer easily form a salt. preferable.
  • the chain length is 5.
  • the chain length is 1.
  • the specific binder polymer preferably has a structural unit having an acid group represented by the following formula A1 and a structural unit having a basic group represented by the following formula B1.
  • the structural unit represented by Formula A1 may be referred to as “structural unit A1”
  • the structural unit represented by Formula B1 may be referred to as “structural unit B1”.
  • R 1 represents a hydrogen atom or a methyl group
  • X 1 represents a single bond, an ester bond or an amide bond
  • L 1 represents a single bond or a divalent linking group
  • Acid has a pKa of 7 or less.
  • R 2 represents a hydrogen atom or a methyl group
  • X 2 represents a single bond, an ester bond or an amide bond
  • L 2 represents a single bond or a divalent linking group
  • Base represents a base group
  • L is the atoms contained in the 2 and Base may form a ring
  • the carbon atom in the ester bond is preferably bonded to the main chain side of the specific binder polymer.
  • X 1 represents an amide bond
  • the carbon atom in the amide bond is preferably bonded to the main chain side of the specific binder polymer.
  • L 1 represents a single bond or a divalent linking group, and is preferably a single bond or a divalent hydrocarbon group optionally having an ester bond or an ether bond therein, It is more preferably a divalent hydrocarbon group, and even more preferably a single bond or a divalent aliphatic saturated hydrocarbon group.
  • L 1 represents a divalent hydrocarbon group
  • L 1 preferably has 2 or more carbon atoms, more preferably has 2 to 15 carbon atoms, and still more preferably has 3 to 12 carbon atoms.
  • Acid represents an acid group having a pKa of 7 or less, and is preferably a carboxy group. * Each independently represents a binding site to another structure.
  • R 2 represents a hydrogen atom or a methyl group
  • X 2 represents a single bond, an ester bond or an amide bond
  • L 2 represents a single bond or a divalent linking group
  • Base represents a base group
  • L is the atoms contained in the 2 and Base may form a ring
  • L 2 represents a single bond or a divalent linking group, and is preferably a single bond or a divalent hydrocarbon group optionally having a urea bond or an ether bond, and is preferably a single bond or a divalent hydrocarbon.
  • the group is more preferably a single bond or a divalent saturated aliphatic hydrocarbon group.
  • L 2 represents a divalent hydrocarbon group
  • the number of carbon atoms of L 2 is preferably 1 or more, more preferably 2 to 10, and further preferably 2 to 8.
  • Base represents a base group, and is preferably a tertiary amino group or a pyridyl group. May be the atoms contained in L 2 and Base bonded to form a ring, examples of the ring formed include tetramethyl piperidine ring, and the like preferably.
  • the structural unit A1 is preferably a structural unit represented by the following formula a
  • the structural unit B1 is preferably a structural unit represented by the following formula b.
  • R 3 represents a hydrogen atom or a methyl group
  • X 3 represents —O— or —NR 7 —
  • R 7 represents a hydrogen atom or an alkyl group
  • L 3 represents a single bond or a carbon atom.
  • * represents a binding site to another structure independently of each other.
  • R 4 represents a hydrogen atom or a methyl group
  • X 4 represents —O— or —NR 8 —
  • R 8 represents a hydrogen atom or an alkyl group
  • L 4 , R 5 and R 6 And at least two of them may combine to form a ring
  • L 4 represents a single bond or a divalent hydrocarbon group having 1 or more carbon atoms
  • R 5 and R 6 each independently represent a carbon atom It represents one or more monovalent hydrocarbon groups
  • * independently represents a binding site to another structure.
  • R 7 is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom. Is more preferable.
  • L 3 represents a single bond or a divalent hydrocarbon group having 1 or more carbon atoms, and is a single bond or a divalent hydrocarbon group which may have an ester bond or an ether bond therein. Is preferably a single bond or a divalent hydrocarbon group, and further preferably a single bond or a divalent aliphatic saturated hydrocarbon group.
  • L 3 represents a divalent hydrocarbon group
  • L 3 preferably has 2 to 15 carbon atoms, and more preferably 3 to 12 carbon atoms.
  • COOH carboxy group
  • COOH represents an acid group having a pKa of 7 or less.
  • the content of the structural unit having an acid group (preferably, the structural unit A1, more preferably, the structural unit a) is preferably 5% by mass or more and 70% by mass or less with respect to the total mass of the specific binder polymer. It is more preferable that the content be from 50% by mass to 50% by mass.
  • R 8 is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom. Is more preferable.
  • L 4 represents a single bond or a divalent hydrocarbon group having 1 or more carbon atoms, and is preferably a single bond or a divalent hydrocarbon group which may have a urea bond or an ether bond. Alternatively, a divalent hydrocarbon group is more preferable, and a single bond or a divalent aliphatic saturated hydrocarbon group is still more preferable.
  • L 4 preferably has 2 to 10 carbon atoms, and more preferably 2 to 8 carbon atoms.
  • at least two of L 4 , R 5, and R 6 may be combined to form a ring, and the formed ring is preferably a tetramethylpiperidine ring or the like.
  • R 5 and R 6 each independently represent a monovalent hydrocarbon group having 1 or more carbon atoms, and is preferably an aliphatic saturated hydrocarbon group having 1 or more carbon atoms. It is preferable that R 5 and R 6 have 1 to 10 carbon atoms.
  • N is a nitrogen atom contained in a tertiary amino group.
  • the content of the structural unit having a basic group is preferably 5% by mass or more and 70% by mass or less with respect to the total mass of the specific binder polymer. It is more preferable that the content be from 50% by mass to 50% by mass.
  • the specific binder polymer further contains another structural unit.
  • Other structural units include structural units formed by a (meth) acrylic ester compound, (meth) acrylamide, benzyl (meth) acrylate, a styrene compound, and the like. Structural units are preferable, and from the viewpoint of inking property, it is more preferable that the structural units are formed from a (meth) acrylate compound having no hydrophilic group.
  • the content of the structural unit formed by the (meth) acrylate compound is preferably from 0.1% by mass to 50% by mass, and more preferably from 5% by mass to 30% by mass with respect to the total mass of the specific binder polymer. Is more preferable.
  • the (meth) acrylate compound may be a monofunctional (meth) acrylate compound having one (meth) acryloxy group in one molecule, and may be two or more (meth) acrylate compounds in one molecule.
  • a polyfunctional (meth) acrylate compound having an acryloxy group may be used, but a monofunctional (meth) acrylate compound is preferred from the viewpoint of developability.
  • the (meth) acrylate compound is preferably a monofunctional (meth) acrylate compound having no hydrophilic group and having a hydrophilic group.
  • a monofunctional methacrylate compound is more preferable.
  • the monofunctional methacrylate compound having no hydrophilic group include alkyl methacrylate and cyclic alkyl methacrylate. These may have a substituent other than the hydrophilic group.
  • alkyl methacrylate having an alkyl group having 1 to 12 carbon atoms is preferable from the viewpoint of ink adhesion.
  • alkyl methacrylate having an alkyl group having 1 to 12 carbon atoms include methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate, and the like.
  • the weight average molecular weight of the specific binder polymer is preferably from 5,000 to 30,000, and preferably from 8,000 to 20,000, from the viewpoint of achieving both printing durability and developability of the resulting lithographic printing plate. Is more preferred.
  • the specific binder polymer may contain one kind alone or two or more kinds.
  • the content of the specific binder polymer in the image recording layer is preferably from 10% by mass to 99% by mass, more preferably from 20% by mass to 95% by mass, and more preferably from 30% by mass to 95% by mass, based on the total mass of the image recording layer. More preferably, it is from 90% by mass to 90% by mass.
  • the specific binder polymer is produced, for example, by a known method.
  • a specific binder polymer can be obtained as a polymer by using a composition containing a monomer used for forming each structural unit and a known polymerization initiator and applying energy such as heating or exposure.
  • the composition may further contain known additives. The detailed conditions of the energy application may be determined with reference to a known document.
  • each structural unit column indicates the same structural unit as the symbol shown in the specific example of each structural unit described above.
  • the description of the content of each structural unit indicates the content (mass ratio) of each structural unit to the total mass of the specific binder polymer.
  • the structural units indicated by the description of MMA, EHMA, and BnMA will be described later.
  • ⁇ Structural units described as MMA, EHMA, and BnMA in the other structural units 1 are structural units having the following structures, respectively.
  • the image recording layer in the positive working lithographic printing plate precursor according to the present disclosure contains an infrared absorbing agent.
  • the infrared absorber is not particularly limited as long as it is a dye that absorbs infrared light and generates heat, and various dyes known as infrared absorbers can be used.
  • the infrared absorber that can be used in the present disclosure commercially available dyes and known ones described in literatures (for example, “Dye Handbook” edited by Organic Synthetic Chemistry Association, published in 1970) can be used.
  • dyes such as azo dyes, metal complex salt azo dyes, pyrazolone azo dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, quinone imine dyes, methine dyes, and cyanine dyes.
  • dyes such as azo dyes, metal complex salt azo dyes, pyrazolone azo dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, quinone imine dyes, methine dyes, and cyanine dyes.
  • these dyes those that absorb at least infrared light or near-infrared light are preferable in that they are suitable for use in a laser that emits infrared light or near-infrared light, and a cyanine dye is particularly preferable. preferable.
  • Examples of such dyes that absorb at least infrared light or near infrared light include, for example, JP-A-58-125246, JP-A-59-84356, JP-A-59-202829, and JP-A-60-202829. And the methine dyes described in JP-A-58-173696, JP-A-58-181690, JP-A-58-194595 and the like. JP-A-58-112793, JP-A-58-224793, JP-A-59-48187, JP-A-59-73996, JP-A-60-52940, JP-A-60-63744, etc.
  • Naphthoquinone dyes Naphthoquinone dyes, squarylium dyes described in JP-A-58-112792, cyanine dyes described in British Patent No. 434,875, and the like. Can. Further, as a dye, a near infrared absorption sensitizer described in US Pat. No. 5,156,938 is preferably used, and a substituted arylbenzo sensitizer described in US Pat. No. 3,881,924 is used. (Thio) pyrylium salts, trimethinethiapyrylium salts described in JP-A-57-142645 (US Pat. No. 4,327,169), JP-A-58-181051, JP-A-58-220143, and JP-A-58-220143.
  • cyanine dyes particularly preferred are cyanine dyes, phthalocyanine dyes, oxonol dyes, squarylium dyes, pyrylium salts, thiopyrylium dyes, and nickel thiolate complexes.
  • a cyanine dye represented by the following formula (a) is most preferable because it is excellent in stability and economy when used in the image recording layer in the present disclosure.
  • X 1 represents a hydrogen atom, a halogen atom, a diarylamino group (—NPh 2 ), X 2 -L 1 or a group shown below.
  • X 2 represents an oxygen atom or a sulfur atom.
  • L 1 represents a hydrocarbon group having 1 to 12 carbon atoms, an aromatic ring having a hetero atom, or a hydrocarbon group having 1 to 12 carbon atoms containing a hetero atom.
  • the hetero atom refers to N, S, O, a halogen atom, and Se.
  • Xa - has Za described later - is defined as in substituted
  • R a represents a hydrogen atom, an alkyl group, an aryl group, a substituted or unsubstituted amino group, and is selected from the group consisting of a halogen atom Represents a group.
  • R 21 and R 22 each independently represent a hydrocarbon group having 1 to 12 carbon atoms. From the storage stability of the positive type lithographic printing plate precursor, R 21 and R 22 are preferably a hydrocarbon group having 2 or more carbon atoms. Further, R 21 and R 22 are bonded to each other to form a 5-membered ring. Alternatively, it is particularly preferable to form a 6-membered ring.
  • Ar 1 and Ar 2 may be the same or different, and represent an aromatic hydrocarbon group which may have a substituent.
  • Preferred aromatic hydrocarbon groups include a benzene ring and a naphthalene ring.
  • Preferred examples of the substituent include a hydrocarbon group having 12 or less carbon atoms, a halogen atom, and an alkoxy group having 12 or less carbon atoms.
  • Y 11 and Y 12 may be the same or different and each represents a sulfur atom or a dialkylmethylene group having 12 or less carbon atoms.
  • R 23 and R 24 may be the same or different, and represent a hydrocarbon group having 20 or less carbon atoms which may have a substituent.
  • Preferred substituents include an alkoxy group having 12 or less carbon atoms, a carboxyl group, and a sulfo group.
  • R 25 , R 26 , R 27 and R 28 may be the same or different and each represent a hydrogen atom or a hydrocarbon group having 12 or less carbon atoms. From the viewpoint of availability of raw materials, a hydrogen atom is preferable.
  • Za - represents a counter anion. However, it has an anionic substituent in the cyanine dye in its structure represented by the formula (a), does not necessitate neutralization of the charge, Za - is not necessary.
  • Preferred Za ⁇ is a halide ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, and a sulfonate ion from the viewpoint of the storage stability of the positive-working lithographic printing plate precursor, and particularly preferably perchloric acid.
  • cyanine dye represented by formula (a) that can be suitably used include paragraphs 0017 to 0019 of JP-A-2001-133969, paragraphs 0012 to 0038 of JP-A-2002-40638, and JP-A-2002. No. 23360, paragraphs 0012 to 0023.
  • Particularly preferred as the infrared absorbing agent contained in the image recording layer is the following cyanine dye A.
  • the content of the infrared absorbing agent is preferably from 0.01% by mass to 50% by mass, more preferably from 0.1% by mass to 30% by mass, based on the total mass of the image recording layer. It is particularly preferred that the content is 0.0% to 30% by mass. When the amount is 0.01% by mass or more, high sensitivity is obtained. When the amount is 50% by mass or less, the uniformity of the layer is good and the durability of the layer is excellent.
  • the image recording layer in the present disclosure may further include another binder polymer.
  • the image recording layer is selected from the group consisting of a phenol resin, a styrene-acrylonitrile copolymer, an acrylic resin, an acetal resin, and a resin having a urea bond, a urethane bond or an amide bond in a main chain as other binder polymers. It is preferable to further include at least one kind.
  • the other binder polymer is preferably an alkali-soluble resin, and more preferably a weak alkali-soluble resin.
  • Other binder polymers are resins that do not fall under the specific binder polymers described above.
  • the phenol resin used as the other binder polymer used in the present disclosure is preferably a phenol resin having a weight average molecular weight of more than 2,000.
  • the phenol resin having a weight average molecular weight of more than 2,000 is a phenol resin containing phenol or a substituted phenol as a constituent unit, and is preferably a novolak resin.
  • the novolak resin is preferably used in a lithographic printing plate precursor because strong hydrogen bonding occurs in an unexposed part and a part of the hydrogen bond is easily released in an exposed part.
  • the novolak resin is not particularly limited as long as it contains a phenol as a structural unit in the molecule.
  • the novolak resin in the present disclosure is a resin obtained by a condensation reaction of phenol, a substituted phenol shown below, and an aldehyde, and specific examples of the phenol include phenol, isopropylphenol, t-butylphenol, Examples include t-amylphenol, hexylphenol, cyclohexylphenol, 3-methyl-4-chloro-6-t-butylphenol, isopropyl cresol, t-butyl cresol, and t-amyl resole. Preferred are t-butylphenol and t-butylcresol.
  • aldehydes include aliphatic and aromatic aldehydes such as formaldehyde, acetaldehyde, acrolein, and crotonaldehyde. Preferably, they are formaldehyde and acetaldehyde.
  • the novolak resin in the present disclosure for example, a condensation polymer of phenol and formaldehyde (phenol formaldehyde resin), a condensation polymer of m-cresol and formaldehyde (m-cresol formaldehyde resin), p A condensation polymer of cresol and formaldehyde (p-cresol formaldehyde resin), a condensation polymer of m- / p-mixed cresol and formaldehyde (m- / p-mixed cresol-formaldehyde resin), phenol and cresol (m-, Polycondensates of formaldehyde with phenol / cresol (m-, p-, or m- / p-mixture), etc.
  • novolak resin as described in US Pat. No. 4,123,279, an alkyl group having 3 to 8 carbon atoms such as t-butylphenol formaldehyde resin and octylphenol formaldehyde resin is further used. Condensed polymers of phenol and formaldehyde having a substituent are exemplified.
  • these novolak resins particularly preferred are phenol formaldehyde resin and phenol / cresol mixed formaldehyde resin.
  • the weight average molecular weight of the phenol resin is preferably more than 2,000 and not more than 50,000, more preferably 2,500 to 20,000, and particularly preferably 3,000 to 10,000. . Further, the degree of dispersion (weight average molecular weight / number average molecular weight) is preferably from 1.1 to 10.
  • the number average molecular weight is a number average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent. Such a phenol resin may be used alone or in combination of two or more.
  • the content of the phenol resin in the image recording layer is preferably from 1% by mass to 90% by mass, based on the total mass of the specific binder polymer, from the viewpoint of obtaining a lithographic printing plate precursor excellent in image formability. It is more preferably from 50% by mass to 50% by mass, and particularly preferably from 10% by mass to 30% by mass.
  • binder polymers include styrene-acrylonitrile copolymers, acrylic resins, acetal resins, and resins having a urea bond, a urethane bond, or an amide bond in the main chain.
  • resins having acidic groups listed in the following (1) to (6) in the side chain of the polymer can be suitably used.
  • Ar represents a divalent aryl linking group which may have a substituent
  • R represents a hydrogen atom or a hydrocarbon group which may have a substituent.
  • a resin having an acidic group selected from the above (1) to (6) a resin having an acid group having a pKa of 9 or less in a side chain is preferable, and a resin having a carboxy group in a side chain is more preferable.
  • the styrene-acrylonitrile copolymer is not particularly limited as long as it is a resin containing at least a constituent unit derived from styrene and a constituent unit derived from acrylonitrile, but is preferably a resin having the above acidic group.
  • the styrene-acrylonitrile copolymer those known as those used for the image recording layer of the positive type lithographic printing plate precursor can be used without particular limitation.
  • the copolymer component derived from acrylonitrile include acrylonitrile and methacrylonitrile, and among them, acrylonitrile is preferable.
  • copolymer component derived from styrene examples include styrene, ⁇ -methylstyrene, p-hydroxystyrene, and p-carboxystyrene, and any of them can be suitably used.
  • the ratio of the acrylonitrile-derived copolymer component to the styrene-derived copolymer component is preferably from 5% by mass to 50% by mass, more preferably from 10% by mass to 45% by mass, based on the total amount. % Is more preferable.
  • the constituent unit derived from acrylonitrile and the constituent unit derived from styrene other constituent units may be further included.
  • the other structural unit is not particularly limited as long as it is a structural unit derived from a copolymerizable compound having a C ⁇ C bond, but an acrylic compound is preferable, and an alkyl (meth) acrylate having 1 to 6 carbon atoms. And hydroxyalkyl (meth) acrylates having 1 to 6 carbon atoms.
  • it may further include a structural unit having an acidic group. Examples of the structural unit having an acidic group include structural units derived from a polymerizable compound such as (meth) acrylic acid and hydroxyphenyl (meth) acrylate.
  • the styrene-acrylonitrile copolymer can be synthesized by a known radical polymerization method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization, cationic polymerization, or anion polymerization.
  • the form of the copolymer is not limited to a linear random copolymer, but may be a block copolymer or a graft copolymer.
  • the weight average molecular weight of a preferred styrene-acrylonitrile copolymer is 1,000 to 1,000,000, and more preferably 3,000 to 300,000.
  • the content of the styrene-acrylonitrile copolymer in the image recording layer is preferably in the range of 5% by mass to 80% by mass, and more preferably in the range of 10% by mass to 70% by mass, based on the total mass of the image recording layer. Is more preferable.
  • the acrylic resin is not particularly limited as long as it contains at least a structural unit derived from an acrylic compound, but is preferably a resin having the above-mentioned acidic group.
  • the acrylic resin those known as those used for the image recording layer of the positive type lithographic printing plate precursor can be used without any particular limitation.
  • the acrylic resin a polymer produced by polymerizing a monomer containing at least one ethylenically unsaturated monomer having an acidic group or a mixture thereof is preferably used.
  • Preferred examples of the ethylenically unsaturated monomer having an acidic group include (meth) acrylic acid and a monomer represented by the following formula. Among these monomers, (meth) acrylic acid is preferred, and methacrylic acid is more preferred.
  • the content of the ethylenically unsaturated monomer having an acidic group is preferably 1% by mass to 30% by mass, more preferably 5% by mass to 25% by mass, based on the total mass of the acrylic resin. More preferably, the content is 10% by mass to 20% by mass.
  • Other monomers other than the ethylenically unsaturated monomer having an acidic group include alkyl (meth) acrylates, (meth) acrylates having an aliphatic hydroxyl group, (meth) acrylamide, vinyl esters, styrenes, N Monomers including nitrogen atoms such as vinylpyrrolidone, and maleimides.
  • those preferably used are (meth) acrylic esters, (meth) acrylamides, maleimides, and (meth) acrylonitrile, and more preferably (meth) acrylamide, maleimidekind.
  • N-substituted maleimides are preferable, and as the N-substituted maleimides, for example, N-methylmaleimide, N-ethylmaleimide, Nn-propylmaleimide, Ni-propylmaleimide, Nn-butyl Maleimide, Nt-butylmaleimide, Nn-hexylmaleimide, N-cyclopentylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide, N-1-naphthylmaleimide and the like can be mentioned.
  • N-cyclohexylmaleimide and N-phenylmaleimide are preferable, and N-phenylmaleimide is more preferable.
  • N-substituted maleimides may be used alone or in combination of two or more.
  • the content of the structural unit derived from the N-substituted maleimide is preferably 50% by mass or less, more preferably 5% by mass to 50% by mass, and still more preferably 10% by mass to 40% by mass based on the total mass of the acrylic resin. .
  • the content of the structural unit is preferably 40% by mass or less, more preferably 1% by mass to 40% by mass, and preferably 2% by mass or less with respect to the total mass of the acrylic resin.
  • the content is more preferably from 30% by mass to 30% by mass.
  • the weight average molecular weight of the acrylic resin is preferably 2,000 or more, more preferably 10,000 to 100,000, and still more preferably 30,000 to 60,000.
  • the content of the acrylic resin in the image recording layer is preferably from 1% by mass to 60% by mass, more preferably from 5% by mass to 50% by mass, based on the total mass of the image recording layer.
  • acetal resin examples include polymer compounds containing structural units represented by the following formulas EV-1 and EV-2.
  • L represents a divalent linking group
  • x is 0 or 1
  • R 1 represents an aromatic or heteroaromatic group having at least one hydroxy group
  • R 2 and R 3 each independently represent a hydrogen atom, a halogen atom, a linear or branched group optionally having a substituent, or a cyclic alkyl group, a linear or branched group optionally having a substituent, Alternatively, it represents a cyclic alkenyl group, an aromatic ring which may have a substituent, or a heteroaromatic ring which may have a substituent.
  • R 1 represents an aromatic ring or a heteroaromatic ring having at least one hydroxy group, and the hydroxy group may be in any of ortho, meta and para positions with respect to the bonding site with L. Good.
  • Preferred examples of the aromatic ring include a phenyl group, a benzyl group, a tolyl group, an o-, m-, p-xylyl group, a naphthyl group, an anthracenyl group, and a phenanthrenyl group.
  • heteroaromatic ring examples include a furyl group, a pyridyl group, a pyrimidyl group, a pyrazoyl group, and a thiophenyl group.
  • aromatic rings or heteroaromatic rings may have a substituent other than a hydroxyl group.
  • substituents include an alkyl group such as a methyl group and an ethyl group, an alkoxy group such as a methoxy group and an ethoxy group, and an aryloxy group.
  • R 1 is preferably a hydroxyphenyl group having a hydroxy group or a hydroxynaphthyl group, and more preferably a hydroxyphenyl group. Examples of the hydroxyphenyl group include a 2-, 3-, or 4-hydroxyphenyl group.
  • hydroxynaphthyl group examples include a 2,3-, 2,4- or 2,5-dihydroxynaphthyl group, a 1,2,3-trihydroxynaphthyl group, and a hydroxynaphthyl group.
  • the hydroxyphenyl group or hydroxynaphthyl group may have a substituent, and preferred substituents include an alkoxy group such as a methoxy group and an ethoxy group.
  • the alkylene group, arylene group, or heteroarylene group may have a substituent, and the substituent includes an alkyl group, a hydroxy group, an amino group, a monoalkylamino group, a dialkylamino group, an alkoxy group, and , A phosphonic acid group or a salt thereof.
  • L is an alkylene group, an arylene group, or, more preferably heteroarylene group, -CH 2 -, - CH 2 -CH 2 -, - CH 2 -CH 2 -CH 2 -, or, phenylene group More preferably, it is.
  • R 2 and R 3 may each independently have a hydrogen atom, a halogen atom, a linear or branched, or cyclic alkyl group or a substituent which may have a substituent.
  • alkyl group examples include methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, chloromethyl, trichloromethyl, isopropyl, isobutyl, isopentyl, and neopentyl. , 1-methoxybutyl, isohexyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and methylcyclohexyl groups.
  • alkenyl group examples include ethenyl, n-propenyl, n-butenyl, n-pentenyl, n-hexenyl, isopropenyl, isobutenyl, isopentenyl, neopentenyl, 1-methylbutenyl, and isohexenyl.
  • halogen atom examples include a chlorine atom.
  • the aromatic ring preferably includes an aryl group such as a phenyl group, a benzyl group, a tolyl group, an o-, m-, p-xylyl group, a naphthyl group, an anthracenyl group, and a phenanthrenyl group.
  • Examples of the heteroaromatic ring include a furyl group, a pyridyl group, a pyrimidyl group, a pyrazoyl group, and a thiophenyl group.
  • R 2 and R 3 each independently preferably represent a hydrogen atom, a chlorine atom or a methyl group, more preferably a hydrogen atom.
  • Examples of the substituent in the alkyl group, alkenyl group, aromatic ring or heteroaromatic ring include an alkoxy group such as a methoxy group and an ethoxy group, a thioalkyl group, and —SH.
  • the aromatic ring or heteroaromatic ring may have, as a substituent, an azo group such as an aryloxy group, a thioaryl group, an azoalkyl group and an azoaryl group, or an amino group.
  • the content of the structural unit represented by the formula EV-1 is preferably 10 mol% or more, and more preferably 10 mol% to 55 mol%, based on the total amount of the monomer units in the polymer compound. Is more preferable, 15 mol% to 45 mol% is further preferable, and 20 mol% to 35 mol% is particularly preferable.
  • the content of the structural unit represented by Formula EV-2 is preferably 15 mol% or more, and more preferably 15 mol% to 60 mol%, based on the total amount of the monomer units in the polymer compound. Is more preferably 20 mol% to 50 mol%, and particularly preferably 25 mol% to 45 mol%.
  • the total content of the structural unit represented by the formula EV-1 and the structural unit represented by the formula EV-2 (however, converted as a monomer unit) is based on the total amount of the monomer units in the polymer compound. On the other hand, 50 mol% to 90 mol% is preferable, 60 mol% to 80 mol% is more preferable, and 65 mol% to 75 mol% is further preferable.
  • the weight average molecular weight of the acetal resin is preferably 5,000 or more, more preferably 10,000 to 500,000, and even more preferably 10,000 to 300,000.
  • the content of the acetal resin in the image recording layer is preferably 1% by mass to 60% by mass, more preferably 5% by mass to 50% by mass, based on the total mass of the image recording layer.
  • a resin having a urea bond, a urethane bond or an amide bond in the main chain means a polymer in which the main chain is formed by a urea bond is a polyurea, a polymer in which the main chain is formed by a urethane bond is a polyurethane, and the main chain is an amide bond. Is referred to as polyamide.
  • the resin having a urea bond, a urethane bond or an amide bond in the main chain only needs to have at least one type of bond selected from the group consisting of a urea bond, a urethane bond and an amide bond in the main chain. May be present in the main chain.
  • a structural unit contained in the resin having a urea bond, a urethane bond or an amide bond in the main chain a structural unit formed by a polyvalent isocyanate compound, a polyvalent carboxylate compound (for example, a polyvalent carboxylic acid halide compound, or And a polyvalent carboxylic acid ester compound).
  • These resins preferably have an acid group in a side chain.
  • the acid group is introduced into these resins, for example, as a structural unit formed by a polyhydric alcohol compound having an acid group or a polyamine compound having an acid group.
  • the polyhydric alcohol compound is preferably a diol compound.
  • the polyvalent amine compound is preferably a diamine compound.
  • the pKa of the acid group is preferably 9 or less, more preferably 7 or less, and still more preferably 5 or less, from the viewpoint of developability.
  • the lower limit of the pKa of the acid group is not particularly limited, but is preferably -5 or more, more preferably 1 or more. These pKas can be calculated in the same manner as the pKa described above.
  • the acid group having a pKa of 9 or less is not particularly limited, but a sulfonamide group (—SO 2 —NH— or —SO 2 —NRsH, Rs is a hydrogen atom or a known substituent), a phenolic hydroxyl group, a carboxy group, a sulfo group Groups, a phosphoric acid group, a phosphonic acid group, a sulfuric acid group, and the like, and a carboxy group is preferable from the viewpoint of printing durability, ablation suppression, and developability.
  • a polyhydric alcohol compound other than a polyhydric alcohol compound having an acid group or a polyhydric alcohol compound having a base group and And a structural unit formed of at least one compound selected from the group consisting of polyamine compounds other than the polyamine compound having an acid group or the polyamine compound having a base group.
  • a polyvalent isocyanate compound a diisocyanate compound is preferable.
  • a dicarboxylate compound is preferable.
  • the polyhydric alcohol compound a diol compound is preferable.
  • the polyvalent amine compound a diamine compound is preferable.
  • a resin (polyurea) having a urea bond in the main chain is obtained by reacting the above polyvalent isocyanate compound, and if necessary, the above other polyhydric alcohol compound and the above other polyamine compound.
  • a resin (polyurethane) having a urethane bond in the main chain can be obtained by reacting the polyvalent isocyanate compound, the polyhydric alcohol compound, and, if necessary, the polyvalent amine compound.
  • a resin having an amide bond in the main chain (Polyamide) is obtained.
  • polyvalent isocyanate compound examples include 1,3-bis (isocyanatomethyl) cyclohexane, isophorone diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 1,3-cyclopentane diisocyanate, 9H- Fluorene-2,7-diisocyanate, 9H-fluoren-9-one-2,7-diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,3-phenylene diisocyanate, tolylene-2,4-diisocyanate , Tolylene-2,6-diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane, 2,2-bis (4-isocyanatophenyl) hexafluoropropane, 1,5-diisocyanate And naphthalene.
  • the content of the structural unit formed by the polyvalent isocyanate compound is preferably 10% by mass or more and 60% by mass or less based on the total mass of the resin having a urea bond, a urethane bond, or an amide bond in the main chain. It is more preferable that the content be from 50% by mass to 50% by mass.
  • polyvalent carboxylate compound examples include a polyvalent carboxylic acid halide compound (eg, a polyvalent carboxylic acid chloride compound) and a polyvalent carboxylic acid ester compound. Examples thereof include the following CL-1 to CL-10. Is mentioned.
  • the content of the structural unit formed by the polyvalent carboxylate compound is preferably 10% by mass or more and 60% by mass or less based on the total mass of the resin having a urea bond, a urethane bond, or an amide bond in the main chain. And more preferably 20% by mass or more and 40% by mass or less.
  • polyhydric alcohol compound examples include polyhydric alcohol compounds used for forming a structural unit having an alkyleneoxy group described below, and examples thereof include ethylene glycol, propylene glycol, 1,4-butanediol, and 1,5-pentane.
  • the content of the structural unit formed by the polyhydric alcohol compound is preferably 0% by mass or more and 40% by mass or less based on the total mass of the resin having a urea bond, a urethane bond, or an amide bond in the main chain. It is more preferable that the content be from 30% by mass to 30% by mass.
  • polyvalent amine compound examples include 2,7-diamino-9H-fluorene, 2,2-bis (4-aminophenyl) hexafluoropropane, 4,4′-diaminobenzophenone, and bis (4-aminophenyl) sulfone , 4,4'-diaminodiphenyl ether, bis (4-aminophenyl) sulfide, 1,1-bis (4-aminophenyl) cyclohexane, 4,4'-diaminodiphenylmethane, 3,3'-diaminodiphenylmethane, 3,3 '-Diaminobenzophenone, 4,4'-diamino-3,3'-dimethyldiphenylmethane, 1,5-diaminonaphthalene, 1,3-phenylenediamine, 2,4-diaminotoluene, 2,6-diaminotoluene, 1, 8
  • the content of the structural unit formed by the polyvalent amine compound is preferably 0% by mass or more and 40% by mass or less based on the total mass of the resin having a urea bond, a urethane bond, or an amide bond in the main chain. It is more preferable that the content is not less than 20% by mass and not more than 20% by mass.
  • the resin having a urea bond, a urethane bond or an amide bond in the main chain preferably further has a structural unit having an alkyleneoxy group in the main chain from the viewpoint of further improving printing durability.
  • the alkyleneoxy group is preferably an alkyleneoxy group having 2 to 10 carbon atoms, more preferably an alkyleneoxy group having 2 to 8 carbon atoms, further preferably an alkyleneoxy group having 2 to 4 carbon atoms, an ethyleneoxy group, or And a propyleneoxy group is particularly preferred.
  • the alkyleneoxy group may be a polyalkyleneoxy group.
  • the polyalkyleneoxy group is preferably a polyalkyleneoxy group having 2 to 50 repetitions, more preferably a polyalkyleneoxy group having 2 to 40 repetitions, and still more preferably a polyalkyleneoxy group having 2 to 30 repetitions.
  • the preferred carbon number of the structural unit of the polyalkyleneoxy group is the same as the preferred carbon number of the alkyleneoxy group.
  • the structural unit having an alkyleneoxy group is introduced, for example, by using a polyalkylene glycol compound (for example, polyethylene glycol or polypropylene glycol) as the polyhydric alcohol compound.
  • the content of the structural unit having an alkyleneoxy group is preferably 0.1% by mass or more and 40% by mass or less based on the total mass of the resin having a urea bond, a urethane bond, or an amide bond in the main chain, and % Or more, more preferably 30% by mass or less, and even more preferably 5% by mass or more and 20% by mass or less.
  • the weight average molecular weight of the resin having a urea bond, urethane bond or amide bond in the main chain is preferably 2,000 or more, more preferably 10,000 to 100,000, and even more preferably 10,000 to 60,000.
  • the content of the resin having a urea bond, urethane bond or amide bond in the main chain in the image recording layer is preferably 1% by mass to 60% by mass, and more preferably 5% by mass to 50% by mass based on the total mass of the image recording layer. % Is more preferred.
  • the image recording layer in the present disclosure preferably contains an acid generator from the viewpoint of improving the sensitivity of the resulting lithographic printing plate precursor.
  • an acid generator is a compound that generates an acid by light or heat, and refers to a compound that generates an acid by being decomposed by infrared irradiation, heating at 100 ° C. or more, or the like.
  • the generated acid is preferably a strong acid having a pKa of 2 or less, such as sulfonic acid and hydrochloric acid.
  • the acid generated from the acid generator increases the permeability of the developer to the image recording layer in the exposed area of the lithographic printing plate precursor, and further improves the solubility of the image recording layer in an aqueous alkaline solution.
  • the acid generator suitably used in the image recording layer according to the present disclosure include the acid generators described in paragraphs 0116 to 0130 of WO 2016/047392.
  • the onium salt compound will be described.
  • Examples of the onium salt compound that can be suitably used in the present disclosure include a compound known as a compound that is decomposed by infrared exposure and thermal energy generated from an infrared absorber upon exposure to generate an acid.
  • a known thermal polymerization initiator or a compound having an onium salt structure described below having a bond having a small bond dissociation energy can be exemplified.
  • Examples of the onium salt suitably used in the present disclosure include known diazonium salts, iodonium salts, sulfonium salts, ammonium salts, pyridinium salts, azinium salts and the like, among which triarylsulfonium, or diaryliodonium sulfonate , Carboxylate, BF 4 ⁇ , PF 6 ⁇ , ClO 4 ⁇ and the like.
  • Examples of the onium salt that can be used as the acid generator in the present disclosure include onium salts represented by the following formulas III to V.
  • Ar 11 and Ar 12 each independently represent an aryl group having 20 or less carbon atoms which may have a substituent.
  • preferred substituents include a halogen atom, a nitro group, an alkyl group having 12 or less carbon atoms, an alkoxy group having 12 or less carbon atoms, and an aryloxy group having 12 or less carbon atoms. Is mentioned.
  • Z 11- is a pair selected from the group consisting of a halide ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, a sulfonate ion, and a sulfonate ion having a fluorine atom such as a perfluoroalkyl sulfonate ion.
  • Ar 21 represents an aryl group having 1 to 20 carbon atoms which may have a substituent.
  • Preferred substituents include a halogen atom, a nitro group, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryloxy group having 1 to 12 carbon atoms, an alkylamino group having 1 to 12 carbon atoms, Examples thereof include a dialkylamino group having 2 to 12 carbon atoms, an arylamino group having 6 to 12 carbon atoms, and a diarylamino group (two aryl groups each having 6 to 12 carbon atoms independently).
  • Z 21- represents a counter ion having the same meaning as Z 11- .
  • R 31 , R 32 and R 33 may be the same or different, and represent a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent.
  • Preferred substituents include a halogen atom, a nitro group, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, and an aryloxy group having 1 to 12 carbon atoms.
  • Z 31- represents a counter ion having the same meaning as Z 11- .
  • More preferred examples of the acid generator that can be used in the present disclosure include the following compounds (PAG-1) to (PAG-5).
  • these acid generators When these acid generators are contained in the image recording layer according to the present disclosure, these compounds may be used alone or in combination of two or more.
  • the content of the acid generator is preferably 0.01% by mass to 50% by mass, more preferably 0.1% by mass to 40% by mass, and more preferably 0.5% by mass, based on the total mass of the image recording layer. -30% by mass is more preferred.
  • the content is in the above range, the sensitivity as an effect of the addition of the acid generator is improved, and the generation of a residual film in the non-image area is suppressed.
  • the image recording layer in the present disclosure may contain an acid multiplying agent.
  • the acid proliferating agent in the present disclosure is a compound substituted with a relatively strong acid residue, and is a compound which easily releases in the presence of an acid catalyst to generate a new acid. That is, it is decomposed by an acid-catalyzed reaction to generate an acid again. At least one acid is increased in one reaction, and the acid concentration is rapidly increased with the progress of the reaction, so that the sensitivity is dramatically improved.
  • the strength of the generated acid is preferably 3 or less, more preferably 2 or less, as the acid dissociation constant (pKa). If the acid dissociation constant is 3 or less, an acid-catalyzed elimination reaction is likely to occur.
  • Examples of the acid used for such an acid catalyst include dichloroacetic acid, trichloroacetic acid, methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, naphthalenesulfonic acid, and phenylsulfonic acid.
  • Acid proliferating agents that can be used are the same as those described in paragraphs 0133 to 0135 of WO 2016/047392.
  • the content of these acid proliferating agents when added to the image recording layer is preferably 0.01% by mass to 20% by mass, and more preferably 0.01% by mass to 10% by mass, based on the total mass of the image recording layer. Is more preferable, and 0.1 to 5% by mass is further preferable.
  • the content of the acid proliferating agent is in the above range, the effect of adding the acid proliferating agent is sufficiently obtained, the sensitivity is improved, and the decrease in the film strength of the image area is suppressed.
  • the image recording layer in the present disclosure may contain, as other additives, a development accelerator, a surfactant, a printing-out agent, a coloring agent, a plasticizer, a waxing agent, and the like.
  • -Development accelerator- Acid anhydrides may be added to the image recording layer in the present disclosure for the purpose of improving sensitivity.
  • acid anhydrides cyclic acid anhydrides are preferable.
  • Specific examples of the cyclic acid anhydrides include phthalic anhydride, tetrahydrophthalic anhydride, and hexahydroanhydride described in US Pat. No. 4,115,128.
  • Phthalic acid, 3,6-endooxytetrahydrophthalic anhydride, tetrachlorophthalic anhydride, maleic anhydride, chloromaleic anhydride, ⁇ -phenylmaleic anhydride, succinic anhydride, pyromellitic anhydride and the like can be used.
  • Examples of the non-cyclic acid anhydride include acetic anhydride.
  • phenols examples include bisphenol A, 2,2'-bishydroxysulfone, p-nitrophenol, p-ethoxyphenol, 2,4,4'-trihydroxybenzophenone, 2,3,4-trihydroxybenzophenone, 4-phenol Hydroxybenzophenone, 4,4 ', 4 "-trihydroxytriphenylmethane, 4,4', 3", 4 "-tetrahydroxy-3,5,3 ', 5'-tetramethyltriphenylmethane and the like.
  • Organic acids are described in JP-A-60-88942, JP-A-2-96755, etc.
  • p-toluenesulfonic acid dodecylbenzenesulfonic acid, p-toluenesulfinic acid, Ethyl sulfate, phenylphosphonic acid, phenylphosphinic acid, phenyl phosphate, diphenyl phosphate, benzoic acid, isophthalic acid, adipic acid, p-toluic acid, 3,4-dimethoxybenzoic acid, phthalic acid, terephthalic acid, 4-cyclohexene -1,2-dicarboxylic acid, erucic acid, lauric acid, n-undecanoic acid, ascorbic acid and the like.
  • the ratio of the above-mentioned acid anhydrides, phenols and organic acids to the total mass of the image recording layer is preferably 0.05% by mass to 20% by mass, more preferably 0.1% by mass to 15% by mass, and 0.1% by mass. Particularly preferred is 1% to 10% by weight.
  • Nonionic surfactants amphoteric surfactants described in JP-A-59-121044 and JP-A-4-13149, JP-A-62-170950, JP-A-11-110 A fluorine-containing monomer copolymer as described in JP-A-288093 and JP-A-2003-57820 can be added.
  • nonionic surfactant examples include sorbitan tristearate, sorbitan monopalmitate, sorbitan triolate, stearic acid monoglyceride, polyoxyethylene nonylphenyl ether, and the like.
  • amphoteric surfactant examples include alkyl di (aminoethyl) glycine, alkyl polyaminoethyl glycine hydrochloride, 2-alkyl-N-carboxyethyl-N-hydroxyethylimidazolinium betaine and N-tetradecyl-N, N-betaine.
  • the ratio of the surfactant to the total mass of the image recording layer is preferably 0.01% by mass to 15% by mass, more preferably 0.01% by mass to 5% by mass, and more preferably 0.05% by mass to 2.0% by mass. % Is more preferred.
  • a printing-out agent for obtaining a visible image immediately after heating by exposure, and a dye or pigment as an image coloring agent can be added to the image recording layer in the present disclosure.
  • the printing-out agent and the colorant are described in detail, for example, in paragraphs 0122 to 0123 of JP-A-2009-229917, and the compounds described herein can be applied to the present disclosure.
  • These dyes are preferably added at a ratio of 0.01 to 10% by mass, more preferably 0.1 to 3% by mass, based on the total mass of the image recording layer.
  • plasticizer may be added to the image recording layer in the present disclosure in order to impart flexibility and the like of the coating film.
  • plasticizers are preferably added at a ratio of 0.5% by mass to 10% by mass, and more preferably at a ratio of 1.0% by mass to 5% by mass, based on the total solid content of the image recording layer. More preferred.
  • a compound that reduces the surface static friction coefficient may be added for the purpose of imparting scratch resistance.
  • Examples thereof include compounds having an ester of a long-chain alkyl carboxylic acid.
  • the addition amount is preferably from 0.1% by mass to 10% by mass, more preferably from 0.5% by mass to 5% by mass, based on the total mass of the image recording layer.
  • the positive planographic printing plate precursor according to the present disclosure has a recording layer having a lower layer and an upper layer in this order on the support, and at least one of the lower layer and the upper layer is the image recording layer.
  • the image recording layer may be either the lower layer or the upper layer, or both, but is preferably an upper layer from the viewpoint of more excellent ablation suppressing effect.
  • such a positive planographic printing plate precursor having a lower layer and an upper layer is also referred to as a "lithographic printing plate precursor having a two-layer structure".
  • the lower layer and the upper layer are preferably formed by separating the two layers.
  • a method of forming the two layers separately for example, a method utilizing the difference in solvent solubility between the components contained in the lower layer and the components contained in the upper layer, or a method of rapidly applying the solvent after applying the upper layer And a method of drying and removing the same. It is preferable to use the latter method in combination, since the separation between the layers can be performed more favorably.
  • these methods will be described in detail, but the method of applying the two layers separately is not limited thereto.
  • each layer can be clearly separated and formed into a coating film.
  • a component insoluble in a solvent such as methyl ethyl ketone or 1-methoxy-2-propanol that dissolves the specific binder polymer as the upper layer component is selected, and the lower layer is applied using a solvent system that dissolves the lower layer component.
  • the upper layer containing the specific binder polymer is dissolved with methyl ethyl ketone, 1-methoxy-2-propanol, or the like, coated, and dried to form a two-layer structure.
  • high-pressure air is blown from a slit nozzle installed substantially perpendicular to the running direction of the web, or heating of steam or the like.
  • This can be achieved by applying heat energy as conductive heat from the lower surface of the web from a roll (heating roll) supplied with the medium therein, or by combining them.
  • the applied amount of the lower layer component applied onto the support of the lithographic printing plate precursor according to the present disclosure after drying is preferably in the range of 0.5 g / m 2 to 4.0 g / m 2 , and more preferably 0.6 g / m 2. / M 2 to 2.5 g / m 2 .
  • the coating amount after drying of the upper layer component is preferably in the range of 0.05g / m 2 ⁇ 1.0g / m 2, in the range of 0.08g / m 2 ⁇ 0.7g / m 2 Is more preferable.
  • the coated amount of the lower layer and the upper layer after drying is preferably in the range of 0.6 g / m 2 to 4.0 g / m 2 , and in the range of 0.7 g / m 2 to 2.5 g / m 2 . Is more preferable.
  • printing durability is excellent
  • image reproducibility and sensitivity are excellent.
  • the lower layer of the lithographic printing plate precursor having a two-layer structure according to the present disclosure may be the image recording layer according to the present disclosure, but is preferably a layer other than the image recording layer according to the present disclosure.
  • the lower layer of the lithographic printing plate precursor having a two-layer structure in the present disclosure is preferably an infrared-sensitive positive-type recording layer whose solubility in an aqueous alkaline solution is improved by heat.
  • the mechanism by which the heat in the lower layer improves the solubility in an aqueous alkali solution there is no particular limitation on the mechanism by which the heat in the lower layer improves the solubility in an aqueous alkali solution, and any mechanism can be used as long as it contains a binder resin and improves the solubility of the heated region.
  • Examples of the heat used for image formation include heat generated when a lower layer containing an infrared absorbent is exposed.
  • Examples of the lower layer having improved solubility in an aqueous alkali solution by heat include a layer containing an alkali-soluble resin having a hydrogen bonding ability such as novolak and urethane, and a compound having a water-insoluble and alkali-soluble resin and a dissolution inhibiting action. Layers and the like are preferred.
  • heat generated in the lower layer can also be used for image formation.
  • the configuration of the lower layer containing an infrared absorbent include, for example, a layer containing an infrared absorbent, a water-insoluble and alkali-soluble resin and a compound having a dissolution inhibiting effect, an infrared absorbent, a water-insoluble and alkali-soluble resin, and an acid generator. And the like.
  • the lower layer in the present disclosure preferably contains a water-insoluble and alkali-soluble resin.
  • a water-insoluble and alkali-soluble resin By containing the water-insoluble and alkali-soluble resin, an interaction is formed between the infrared absorber and the polar group of the water-insoluble and alkali-soluble resin, and a positive photosensitive layer is formed.
  • the general water-insoluble and alkali-soluble resin will be described in detail below, but among them, for example, preferably a polyamide resin, an epoxy resin, a polyacetal resin, an acrylic resin, a methacrylic resin, a polystyrene-based resin, a novolac-type phenol-based resin, and the like. be able to.
  • the water-insoluble and alkali-soluble resin that can be used in the present disclosure is not particularly limited as long as it has a property of dissolving when it comes into contact with an alkaline developer, but the main chain and / or side chain in the polymer is acidic. It is preferably a homopolymer containing a group, a copolymer thereof, or a mixture thereof.
  • the water-insoluble and alkali-soluble resin having such an acidic group preferably has a functional group such as a phenolic hydroxyl group, a carboxy group, a sulfonic acid group, a phosphoric acid group, a sulfonamide group, and an active imide group.
  • such a resin can be suitably produced by copolymerizing a monomer mixture containing at least one ethylenically unsaturated monomer having the above functional group.
  • Preferred examples of the ethylenically unsaturated monomer having a functional group include compounds represented by the following formula and mixtures thereof in addition to acrylic acid and methacrylic acid.
  • R 40 represents a hydrogen atom or a methyl group.
  • the water-insoluble and alkali-soluble resin that can be used in the present disclosure is preferably a polymer compound obtained by copolymerizing another polymerizable monomer in addition to the polymerizable monomer.
  • the copolymerization ratio in this case is such that a monomer having alkali solubility, such as a monomer having a functional group such as a phenolic hydroxyl group, a carboxy group, a sulfonic acid group, a phosphoric acid group, a sulfonamide group, and an active imide group, is used in an amount of 10 mol. % Or more, more preferably 20 mol% or more.
  • the copolymerization component of the monomer imparting alkali solubility is 10 mol% or more, sufficient alkali solubility can be obtained and developability is excellent.
  • Alkyl acrylates and alkyl methacrylates such as methyl acrylate, ethyl acrylate, propyl acrylate, benzyl acrylate, methyl methacrylate, ethyl methacrylate, cyclohexyl methacrylate, and benzyl methacrylate;
  • Acrylic esters having an aliphatic hydroxyl group such as 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate, and methacrylic esters.
  • Acrylamide or methacrylamide such as acrylamide, methacrylamide, N-methylacrylamide, N-ethylacrylamide and N-phenylacrylamide.
  • Vinyl esters such as vinyl acetate, vinyl chloroacetate, vinyl butyrate, and vinyl benzoate.
  • Styrenes such as styrene, ⁇ -methylstyrene, methylstyrene, and chloromethylstyrene.
  • Other nitrogen atom-containing monomers such as N-vinylpyrrolidone, N-vinylpyridine, acrylonitrile and methacrylonitrile.
  • N-methylmaleimide N-ethylmaleimide, N-propylmaleimide, N-butylmaleimide, N-phenylmaleimide, N-2-methylphenylmaleimide, N-2,6-diethylphenylmaleimide, N-2-chlorophenylmaleimide, Maleimides such as N-cyclohexylmaleimide, N-laurylmaleimide, N-hydroxyphenylmaleimide and the like.
  • those preferably used are (meth) acrylates, (meth) acrylamides, maleimides, and (meth) acrylonitrile.
  • alkali-soluble resin a novolak resin mentioned as another binder polymer as an optional component of the image recording layer according to the present disclosure is also preferably exemplified. Further, the above-mentioned water-insoluble and alkali-soluble resin can be used for the image recording layer in the present disclosure.
  • the resin that can be used in combination include a water-insoluble and alkali-soluble resin.
  • the general water-insoluble and alkali-soluble resin will be described in detail below, but among them, for example, preferably a polyamide resin, an epoxy resin, a polyacetal resin, an acrylic resin, a methacrylic resin, a polystyrene-based resin, a novolac-type phenol-based resin, and the like. be able to.
  • the mixing amount is preferably 50% by mass or less based on the water-insoluble and alkali-soluble resin.
  • the water-insoluble and alkali-soluble resin preferably has a weight average molecular weight of 2,000 or more and a number average molecular weight of 500 or more, a weight average molecular weight of 5,000 to 300,000, and a number average molecular weight of 800 to 800. More preferably, it is 250,000. Further, the degree of dispersion (weight average molecular weight / number average molecular weight) of the alkali-soluble resin is preferably from 1.1 to 10.
  • the alkali-soluble resin in the lower layer according to the present disclosure may be used alone or in combination of two or more.
  • the content of the alkali-soluble resin in the total solid content of the lower layer is preferably 2.0% by mass to 99.5% by mass with respect to the total mass of the lower layer, and 10.0% by mass to 99.5% by mass.
  • the content is more preferably 0% by mass, and further preferably 20.0% by mass to 90.0% by mass.
  • the amount of the alkali-soluble resin is 2.0% by mass or more, the durability of the image recording layer (photosensitive layer) is excellent, and when the amount is 99.5% by mass or less, both the sensitivity and the durability are improved. Excellent.
  • the lower layer may contain an infrared absorber.
  • the infrared absorbing agent is not particularly limited as long as it is a dye that absorbs infrared light and generates heat, and the above-described infrared absorbing agent used in the image recording layer according to the present disclosure can be similarly used.
  • Particularly preferred dyes are cyanine dyes represented by the above formula (a).
  • the amount of the infrared absorber added in the lower layer is preferably 0.01% by mass to 50% by mass, more preferably 0.1% by mass to 30% by mass, and more preferably 1% by mass to 30% by mass, based on the total mass of the lower layer. It is particularly preferred that the content is from 0.0% by mass to 10% by mass. When the amount is 0.01% by mass or more, the sensitivity is improved. When the amount is 50% by mass or less, the uniformity of the layer is good and the durability of the layer is excellent.
  • the lower layer of the lithographic printing plate precursor having a two-layer structure may contain an acid generator, an acid multiplying agent, a development accelerator, a surfactant, a printing-out / coloring agent, a plasticizer, a waxing agent, and the like.
  • an acid generator an acid multiplying agent
  • a development accelerator a surfactant
  • a printing-out / coloring agent e.g., a plasticizer
  • a waxing agent e.g., a waxing agent, and the like.
  • the respective components used in the image recording layer in the present disclosure described above can be used in the same manner, and preferred embodiments are also the same.
  • the lithographic printing plate precursor having a two-layer structure in the present disclosure preferably has the image recording layer as an upper layer.
  • the upper layer of the lithographic printing plate precursor having a two-layer structure in the present disclosure is preferably formed by applying a positive photosensitive resin composition according to the present disclosure described later.
  • a lithographic printing plate precursor excellent in ablation suppression can be obtained.
  • a solidified product of the positive photosensitive resin composition according to the present disclosure for the upper layer a lithographic printing plate precursor excellent in ablation suppression can be obtained.
  • the upper layer is also preferably the image recording layer according to the present disclosure, but the upper layer may be formed as a layer other than the image recording layer according to the present disclosure.
  • the preferred embodiment of the upper layer is the same as the preferred embodiment of the lower layer described above.
  • the positive planographic printing plate precursor according to the present disclosure has a support.
  • the support in the present disclosure is not particularly limited as long as it is a dimensionally stable plate having the necessary strength and durability, and examples thereof include paper and plastic (for example, polyethylene, polypropylene, and polystyrene).
  • Laminated paper, metal plate for example, aluminum, zinc, copper, etc.
  • plastic film for example, cellulose diacetate, cellulose triacetate, cellulose propionate, cellulose butyrate, cellulose acetate butyrate, cellulose nitrate, polyethylene terephthalate, polyethylene, Polystyrene, polypropylene, polycarbonate, polyvinyl acetal, etc.
  • a polyester film or an aluminum plate is preferable, and among them, an aluminum plate having good dimensional stability and relatively low cost is particularly preferable.
  • Suitable aluminum plates are a pure aluminum plate and an alloy plate containing aluminum as a main component and a trace amount of a different element, and may be a plastic film on which aluminum is laminated or vapor-deposited.
  • the foreign elements contained in the aluminum alloy include silicon, iron, manganese, copper, magnesium, chromium, zinc, bismuth, nickel and titanium.
  • the content of the foreign element in the alloy is preferably 10% by mass or less.
  • Aluminum that is particularly suitable in the present disclosure is pure aluminum, but completely pure aluminum is difficult to produce due to refining technology, and therefore may contain slightly different elements.
  • the composition of the aluminum plate applied to the present disclosure is not specified, and an aluminum plate of a conventionally known and used material can be appropriately used.
  • the thickness of the aluminum plate used in the present disclosure is preferably 0.1 mm to 0.6 mm, more preferably 0.15 mm to 0.4 mm, and particularly preferably 0.2 mm to 0.3 mm. preferable.
  • Such an aluminum plate may be subjected to a surface treatment such as a surface roughening treatment and an anodic oxidation treatment as necessary.
  • a surface treatment such as a surface roughening treatment and an anodic oxidation treatment as necessary.
  • the surface treatment of the aluminum support for example, as described in detail in paragraphs 0167 to 0169 of JP-A-2009-175195, degreasing treatment with a surfactant, an organic solvent or an alkaline aqueous solution, a rough surface Treatment, anodic oxidation treatment and the like are appropriately performed.
  • the anodized aluminum surface is subjected to a hydrophilic treatment as necessary.
  • hydrophilization treatment a method of treating with an alkali metal silicate (for example, an aqueous solution of sodium silicate), potassium fluoride zirconate or polyvinyl phosphonic acid as disclosed in paragraph 0169 of JP-A-2009-175195 are used. Further, a support described in JP-A-2011-245844 is also preferably used.
  • an alkali metal silicate for example, an aqueous solution of sodium silicate
  • potassium fluoride zirconate or polyvinyl phosphonic acid as disclosed in paragraph 0169 of JP-A-2009-175195
  • a support described in JP-A-2011-245844 is also preferably used.
  • the positive-working lithographic printing plate precursor according to the present disclosure may have an undercoat layer between the support and the image recording layer (or a lower layer in the recording layer) as needed.
  • the undercoat layer component various organic compounds are used, for example, carboxymethylcellulose, phosphonic acids having an amino group such as dextrin, organic phosphonic acid, organic phosphoric acid, organic phosphinic acid, amino acids, and a hydroxy group. Preferred examples include a hydrochloride of an amine having the same.
  • These undercoat layer components may be used alone or in combination of two or more.
  • the coating amount of the undercoat layer is preferably from 2 mg / m 2 to 200 mg / m 2 , more preferably from 5 mg / m 2 to 100 mg / m 2 . When the coating amount is in the above range, sufficient printing durability can be obtained.
  • a back coat layer On the back surface of the support of the lithographic printing plate precursor according to the present disclosure, a back coat layer is provided as necessary.
  • the back coat layer comprises an organic polymer compound described in JP-A-5-45885 and a metal oxide obtained by hydrolysis and polycondensation of an organic or inorganic metal compound described in JP-A-6-35174.
  • a coating layer is preferably used.
  • silicon alkoxy compounds such as Si (OCH 3 ) 4 , Si (OC 2 H 5 ) 4 , Si (OC 3 H 7 ) 4 and Si (OC 4 H 9 ) 4 are available at low cost.
  • the coating layer of a metal oxide obtained therefrom has excellent developer resistance and is particularly preferable.
  • the method of preparing a lithographic printing plate according to the present disclosure includes an exposure step of image-exposing the positive lithographic printing plate precursor according to the present disclosure, And a developing step of developing using this order.
  • an exposure step of image-exposing the positive lithographic printing plate precursor according to the present disclosure includes an exposure step of image-exposing the positive lithographic printing plate precursor according to the present disclosure, And a developing step of developing using this order.
  • the method for producing a lithographic printing plate according to the present disclosure includes an exposure step of exposing the positive working lithographic printing plate precursor according to the present disclosure to an image.
  • a light source of the actinic ray used for image exposure of the lithographic printing plate precursor according to the present disclosure a light source having an emission wavelength in the near infrared to infrared region is preferable, and a solid laser and a semiconductor laser are more preferable.
  • the output of the laser is preferably 100 mW or more, and in order to shorten the exposure time, it is preferable to use a multi-beam laser device. Further, the exposure time per pixel is preferably within 20 ⁇ sec.
  • the energy applied to the lithographic printing plate precursor is preferably from 10 mJ / cm 2 to 300 mJ / cm 2 . When the content is within the above range, the solubility of the image recording layer in an aqueous alkaline solution is sufficiently improved, and laser ablation can be suppressed, and damage to an image can be prevented.
  • the exposure according to the present disclosure can be performed by overlapping the light beams of the light sources.
  • Overlap means that the sub-scanning pitch width is smaller than the beam diameter.
  • the overlap can be quantitatively represented by FWHM / sub-scanning pitch width (overlap coefficient).
  • the overlap coefficient is preferably equal to or greater than 0.1.
  • the scanning method of the light source of the exposure apparatus that can be used in the present disclosure is not particularly limited, and a cylindrical outer surface scanning method, a cylindrical inner surface scanning method, a plane scanning method, or the like can be used.
  • the channel of the light source may be a single channel or a multi-channel, but in the case of a cylindrical outer surface type, a multi-channel is preferably used.
  • the method of preparing a lithographic printing plate according to the present disclosure includes a developing step of developing the exposed positive type lithographic printing plate precursor using a developer having a pH of 10.0 or less.
  • the developing solution used in the developing step is not particularly limited as long as the developing solution has a pH of 10.0 or less.
  • the developer is preferably an aqueous solution.
  • development may be performed using a developer having a pH of more than 10.0.
  • development can be performed using a known developer such as the developers described in paragraphs 0270 to 0292 of JP-A-2003-1956.
  • the developer may contain a surfactant.
  • a surfactant used in the developer, any of anionic, nonionic, cationic, and amphoteric surfactants can be used, but as described above, anionic and nonionic surfactants can be used. Agents are preferred.
  • anionic, nonionic, cationic and amphoteric surfactants used in the developer in the present disclosure those described in paragraphs 0128 to 0131 of JP-A-2013-134341 can be used.
  • the HLB value is preferably 6 or more, and more preferably 8 or more.
  • an anionic surfactant and a nonionic surfactant are preferable, and an anionic surfactant containing a sulfonic acid or a sulfonic acid salt, and a nonionic surfactant having an aromatic ring and an ethylene oxide chain are used.
  • Surfactants are particularly preferred. Surfactants can be used alone or in combination.
  • the content of the surfactant in the developer is preferably 0.01% by mass to 10% by mass, more preferably 0.01% by mass to 5% by mass.
  • the developing solution used in the developing step is not particularly limited as long as it is a developing solution having a pH of 10.0 or less, but is preferably a developing solution having a pH of 8.0 to 10.0, and a developing solution having a pH of 9.0 to 9.9. More preferably, it is a liquid.
  • a relatively low pH developer a decrease in pH due to, for example, dissolution of CO 2 in the atmosphere is suppressed as compared with a conventionally used, for example, a high pH developer having a pH of about 12. Easy to be. That is, it can be said that the low pH provides excellent stability during use or storage of the developer.
  • the low-pH developer As described above, in the low-pH developer, a decrease in the pH of the developer is suppressed, so that a decrease in developability, generation of development scum, and the like are suppressed. Further, in order to keep the pH of the low pH developer at an initial value, it is preferable to use a buffer as the developer. As the buffer, it is particularly preferable to use a carbonate buffer.
  • the carbonate buffer system refers to a buffer containing a carbonate ion and a bicarbonate ion as a buffer.
  • carbonate and bicarbonate may be added to the developing solution, or by adjusting the pH after adding carbonate or bicarbonate, Ions and bicarbonate ions may be generated.
  • the carbonate and bicarbonate are not particularly limited, but are preferably alkali metal salts. Examples of the alkali metal include lithium, sodium, and potassium, and sodium is particularly preferable. These may be used alone or in combination of two or more.
  • the total amount of carbonates and bicarbonates is preferably 0.3% by mass to 20% by mass, more preferably 0.5% by mass to 10% by mass, and more preferably 1% by mass to 5% by mass, based on the total mass of the developer. % Is particularly preferred.
  • the total amount is 0.3% by mass or more, the developability and the processing ability do not decrease, and when the total amount is 20% by mass or less, precipitation and crystals are hardly generated. It is difficult to gel and does not hinder waste liquid treatment.
  • Organic alkali agents include monomethylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, monoisopropylamine, diisopropylamine, triisopropylamine, n-butylamine, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, Examples thereof include diisopropanolamine, ethyleneimine, ethylenediamine, pyridine, and tetramethylammonium hydroxide.
  • the developer may contain a wetting agent, a preservative, a chelating compound, an antifoaming agent, an organic acid, an organic solvent, an inorganic acid, an inorganic salt, and the like.
  • a water-soluble polymer compound is added, the plate surface is likely to become sticky, particularly when the developer is fatigued.
  • a wetting agent described in paragraph 0141 of JP-A-2013-134341 can be suitably used.
  • the wetting agent may be used alone or in combination of two or more.
  • the wetting agent is preferably used in an amount of 0.1% to 5% by weight, based on the total weight of the developer.
  • a preservative described in paragraph 0142 of JP-A-2013-134341 can be suitably used. It is preferable to use two or more preservatives in combination so as to be effective against various molds and sterilization.
  • the amount of the preservative added is an amount stably exerting an effect on bacteria, mold, yeast and the like, and varies depending on the kind of bacteria, mold and yeast. The range is preferably from 0.01% to 4% by mass.
  • a chelate compound described in paragraph 0143 of JP-A-2013-134341 can be suitably used.
  • the chelate compound is selected from those which are stably present in the composition of the developer and do not impair printability.
  • the addition amount is preferably 0.001% by mass to 1.0% by mass with respect to the total mass of the developer.
  • the antifoaming agent described in paragraph 0144 of JP-A-2013-134341 can be suitably used.
  • the content of the antifoaming agent is preferably in the range of 0.001% by mass to 1.0% by mass based on the total mass of the developer.
  • an antifoaming agent described in paragraph 0145 of JP-A-2013-134341 can be suitably used.
  • the content of the organic acid is preferably 0.01% by mass to 0.5% by mass based on the total mass of the developer.
  • organic solvent examples include aliphatic hydrocarbons (hexane, heptane, “Isoper E, H, G” (manufactured by Esso Chemical Co., Ltd.), gasoline, or kerosene, etc.), and aromatic hydrocarbons (toluene, Xylene, etc.), halogenated hydrocarbons (methylene dichloride, ethylene dichloride, tricrene, monochlorobenzene, etc.) and polar solvents.
  • aliphatic hydrocarbons hexane, heptane, “Isoper E, H, G” (manufactured by Esso Chemical Co., Ltd.)
  • gasoline or kerosene, etc.
  • aromatic hydrocarbons toluene, Xylene, etc.
  • halogenated hydrocarbons methylene dichloride, ethylene dichloride, tricrene, monochlorobenzene, etc.
  • alcohols methanol, ethanol, propanol, isopropanol, benzyl alcohol, ethylene glycol monomethyl ether, 2-ethoxyethanol, etc.
  • ketones methyl ethyl ketone, cyclohexanone, etc.
  • esters ethyl acetate, methyl lactate, propylene Glycol monomethyl ether acetate
  • the above organic solvent is insoluble in water, it can be used after being solubilized in water using a surfactant or the like.
  • the concentration of the solvent is preferably less than 40% by mass from the viewpoint of safety and flammability.
  • the inorganic acid and inorganic salt phosphoric acid, metaphosphoric acid, ammonium monophosphate, ammonium phosphate dibasic, sodium phosphate monobasic, sodium phosphate dibasic, potassium phosphate monobasic, potassium phosphate dibasic, Examples thereof include sodium tripolyphosphate, potassium pyrophosphate, sodium hexametaphosphate, magnesium nitrate, sodium nitrate, potassium nitrate, ammonium nitrate, sodium sulfate, potassium sulfate, ammonium sulfate, sodium sulfite, ammonium sulfite, sodium hydrogen sulfate, and nickel sulfate.
  • the content of the inorganic salt is preferably from 0.01% by mass to 0.5% by mass based on the total mass of the developer.
  • the temperature of development is not particularly limited as long as development is possible, but is preferably 60 ° C or lower, more preferably 15 ° C to 40 ° C.
  • the developing solution may become fatigued depending on the processing amount. Therefore, the processing capability may be restored by using a replenisher or a fresh developing solution.
  • a method in which alkali development is performed, alkali is removed in a post-water washing step, gum treatment is performed in a gumming step, and drying is performed in a drying step can be exemplified.
  • a method in which pre-washing, development, and gumming are performed simultaneously by using an aqueous solution containing carbonate ions, hydrogen carbonate ions, and a surfactant can be preferably exemplified. Therefore, the pre-washing step does not need to be particularly performed, and it is preferable to perform the pre-washing, development, and gumming in one bath using only one solution, and then to perform the drying step. After the development, it is preferable that excess developer is removed using a squeeze roller or the like, and then drying is performed.
  • the development step can be suitably performed by an automatic processor equipped with a rubbing member.
  • the automatic processor include an automatic processor described in JP-A-2-220061 and JP-A-60-59351, which perform rubbing while transporting a lithographic printing plate precursor after image exposure, and a cylinder.
  • the lithographic printing plate precursor after the image exposure set above is subjected to a rubbing treatment while rotating a cylinder. No. Among them, an automatic processor using a rotating brush roll as the rubbing member is particularly preferable.
  • the rotating brush roll used in the present disclosure can be appropriately selected in consideration of the difficulty of damaging the image area, the stiffness of the support of the lithographic printing plate precursor, and the like.
  • a known one formed by implanting a brush material into a plastic or metal roll can be used.
  • metal or plastic in which brush materials are implanted in rows A brush roll can be used in which the grooved material is radially wound around a plastic or metal roll serving as a core without gaps.
  • plastic fibers for example, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6.6 and nylon 6.10, and polyacrylics such as polyacrylonitrile and polyalkyl (meth) acrylate
  • plastic fibers for example, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6.6 and nylon 6.10, and polyacrylics such as polyacrylonitrile and polyalkyl (meth) acrylate
  • Polypropylene, polystyrene, and other polyolefin-based synthetic fibers for example, fibers having a hair diameter of 20 ⁇ m to 400 ⁇ m and a hair length of 5 mm to 30 mm can be suitably used.
  • the outer diameter of the rotating brush roll is preferably 30 mm to 200 mm, and the peripheral speed at the tip of the brush for rubbing the plate surface is preferably 0.1 m / sec to 5 m / sec. It is preferable to use a plurality of rotating brush rolls.
  • the rotating direction of the rotating brush roll may be the same direction or the opposite direction to the conveying direction of the lithographic printing plate precursor, but when two or more rotating brush rolls are used, at least one rotating brush roll is used.
  • the rotating brush rolls rotate in the same direction, and at least one rotating brush roll rotates in the opposite direction.
  • it is also effective to swing the rotating brush roll in the rotation axis direction of the brush roll.
  • a drying step is preferably provided continuously or discontinuously. Drying is performed by hot air, infrared rays, far infrared rays, or the like.
  • an automatic processor suitably used in the method for producing a lithographic printing plate according to the present disclosure, an apparatus having a developing section and a drying section is used, and the lithographic printing plate precursor is developed and gummed in a developing tank. After that, drying is performed in a drying section to obtain a lithographic printing plate.
  • the printing plate after development can be heated under very strong conditions.
  • the heating temperature is preferably in the range of 200 ° C to 500 ° C. If the temperature is low, a sufficient image strengthening effect cannot be obtained, and if the temperature is too high, problems such as deterioration of the support and thermal decomposition of the image area may occur.
  • the lithographic printing plate thus obtained is set on an offset printing machine, and is suitably used for printing a large number of sheets.
  • the positive photosensitive resin composition according to the present disclosure is an addition-polymerized resin, and includes a structural unit having an acid group having a pKa of 7 or less and a structural unit having a base group (preferably having a pKaH of 4 or more).
  • a binder polymer specifically binder polymer, wherein at least one of the acid group of the structural unit having an acid group and the base group of the structural unit having a base group is bonded to the main chain via a linking group; ,including.
  • the specific binder polymer contained in the positive photosensitive resin composition according to the present disclosure, and the infrared absorber, the specific binder polymer contained in the image recording layer of the positive type lithographic printing plate precursor described above, and the infrared absorber Each has the same meaning, and the preferred embodiments are also the same.
  • the positive photosensitive resin composition according to the present disclosure further contains at least one selected from the group consisting of the above-mentioned other binder polymer, acid generator, acid multiplying agent, and other additives. May be.
  • the positive photosensitive resin composition according to the present disclosure may contain a known solvent.
  • the content of each component contained in the positive photosensitive resin composition according to the present disclosure is the content of each component contained in the image recording layer of the positive lithographic printing plate precursor described above, the positive photosensitive resin composition Corresponds to the amount read as the solid content.
  • a positive planographic printing plate precursor having a solidified product of the positive photosensitive resin composition according to the present disclosure as an image recording layer can be obtained.
  • % and “parts” mean “% by mass” and “parts by mass”, respectively, unless otherwise specified.
  • the molecular weight is a weight average molecular weight (Mw), and the ratio of the constituent units is a mole percentage, unless otherwise specified.
  • the weight average molecular weight (Mw) is a value measured as a polystyrene equivalent value by gel permeation chromatography (GPC).
  • GPC gel permeation chromatography
  • the following compounds were used as monomers for forming each structural unit.
  • the synthetic product was synthesized by the following method and used as a monomer for forming each structural unit.
  • B1-7 was synthesized in the same manner except that 2-aminopyridine was changed to the corresponding amine (3-aminopyridine or 4-aminopyridine).
  • A1-1 11-Acrylamidoundecanoic acid (synthetic product)
  • A1-2 6-acrylamidohexanoic acid (Sigma-Aldrich)
  • A1-3 2-methacryloyloxyethyl succinic acid (manufactured by Kyoei Chemical Co., Ltd.)
  • A1-4 2-acryloyloxyethyl hexahydrophthalic acid (manufactured by Kyoei Chemical Co., Ltd.)
  • A1-5 ⁇ -carboxy-polycaprolactone (n ⁇ 2) monoacrylate (manufactured by Toagosei Co., Ltd.)
  • A1-6 Methacrylic acid (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • A1-7 Acrylic acid (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • A1-8 4-vinylbenzoic acid (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • B1-1 Pentamethylpiperidyl methacrylate (manufactured by Hitachi Chemical Co., Ltd.)
  • B1-2 2- (dimethylamino) ethyl methacrylate (manufactured by Sigma-Aldrich)
  • B1-3 2- (diethylamino) ethyl methacrylate (manufactured by Sigma-Aldrich)
  • B1-4 2- (diisopropylamino) ethyl methacrylate (manufactured by Sigma-Aldrich)
  • B1-5 4-vinylpyridine (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • B1-6 2-vinylpyridine (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • B1-7 2- (3- (2-pyridinyl) ureido) ethyl methacrylate (synthetic product)
  • B1-8 2- (3- (3-pyridinyl) ureido
  • MMA Methyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • EHMA Ethylhexyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • BnMA benzyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.)
  • undercoat layer coating solution 1 shown below was coated on the support, and dried at 80 ° C. for 15 seconds to provide an undercoat layer.
  • the coating amount after drying was 15 mg / m 2 .
  • the components described below were mixed to prepare a photosensitive resin composition (I).
  • the photosensitive resin composition (I) is a positive photosensitive resin composition.
  • the photosensitive resin composition (I) was applied to the obtained support having an undercoat layer with a wire bar, and then dried in a drying oven at 150 ° C. for 40 seconds to obtain a specific binder.
  • the coating amount of the polymer was adjusted to 1.0 g / m 2 , an image recording layer was provided, and a lithographic printing plate precursor was obtained.
  • ⁇ Image part retention> The lithographic printing plate precursor obtained was immersed in a developing bath charged with the developing solution 1 without exposure, and the image density of the image recording layer measured by a Macbeth densitometer at a developing temperature of 30 ° C.
  • the immersion time that was 3% lower than the image density of the recording layer was defined as the image part holding time. If the decrease rate of the image density was less than 3% even after 80 seconds from the start of immersion, ">80" was described. The longer the image part development time, the better the image part retention.
  • ⁇ Print durability> A test pattern was drawn on the obtained lithographic printing plate precursor using a Trendsetter manufactured by Creo Corporation at a beam intensity of 9 W and a drum rotation speed of 150 rpm (revolutions per minute). Thereafter, development was carried out using a PS processor LP940H manufactured by FUJIFILM Corporation in which the developer 1 was charged, at a development temperature of 30 ° C. and a development time of the non-image area development time + 2 seconds. This was continuously printed using a printing machine Lithrone manufactured by Komori Corporation. As the ink, as a model of a low-grade material, a special ink prepared by Toyo Ink Co., Ltd. containing calcium carbonate was used. At this time, how many sheets can be printed while maintaining a sufficient ink density was visually measured to evaluate the printing durability. The number of sheets in Comparative Example 1-2 was set to 100, and relative evaluation was performed based on the number of sheets.
  • a transparent 0.1 mm-thick polyethylene terephthalate film (manufactured by FUJIFILM Corporation) was brought into close contact with the surface of the lithographic printing plate precursor, and the entire surface was exposed under the same conditions as in the evaluation of developability. After the exposure, the polyethylene terephthalate film was removed and visually observed to observe the degree of surface contamination. A sample was determined as A when no dirt was recognized, B was determined when dirt was slightly recognized, and C was determined as dirt to such an extent that the other side was not seen through the film. It can be said that the smaller the dirt is, the better the ablation suppressing property is, and the evaluation is preferably A or B, and A is more preferable.
  • the description of the type column indicates the type of the specific binder polymer used as pKa of the acid group, ClogP of the acid group, pKaH of the base group, ClogP of the base group, acid value, base value, acid value.
  • the description of the column of group / base ratio and Mw is the pKa of the acid group, ClogP of the acid group, pKaH of the base group, ClogP of the base group, acid value, base value, and acid group / base, respectively, which were measured by the methods described above.
  • the ratio and the value of Mw weight average molecular weight
  • the description in the column of the specific binder addition amount indicates the addition amount of the specific binder polymer in the photosensitive resin composition (1) (% in parentheses is% by mass based on the total solid content of the photosensitive resin composition). .
  • the description such as “+ polymer 1 is 0.10 part” in the column of the specific binder addition amount is “in the above photosensitive resin composition (1), other than the specific binder polymer”.
  • the evaluation item "developed scum” means evaluation of "development scum suppression”. These contents are the same in Tables 4 to 6 described later.
  • the other binder polymers polymer1 to polymer5 are as follows.
  • the polymers C-1 to C-6 used in Comparative Examples 1-1 to 1-6 are the following polymers.
  • C-6 The following polymer of CA-3 was used.
  • the weight average molecular weight is 5,000.
  • Example 2-1 to 2-6 and Comparative Examples 2-1 to 2-6) ⁇ Preparation of a lithographic printing plate having a two-layer structure>
  • the following lower layer forming composition (II) was coated on a support similar to that of Example 1-1 with a wire bar, and then dried in a drying oven at 133 ° C. for 60 seconds.
  • the coating amount of the binder polymer was adjusted to 0.7 g / m 2, and a lower layer was provided.
  • the photosensitive resin composition (I) prepared in the same manner as in Example 1-1 (the details of the binder polymer are described below) (As in Table 4) was applied with a wire bar to provide an upper layer. After coating, drying was performed at 130 ° C. for 50 seconds to obtain a lithographic printing plate precursor having a coating amount of the lower layer and the upper layer of 1.0 g / m 2 .
  • Examples 3-1 to 3-5 and Comparative examples 3-1 to 3-6 Using the two-layered lithographic printing plate precursor obtained by the same method as in Examples 2-1 to 2-6 and Comparative examples 2-1 to 2-6, changing developer 1 to developer 2 shown below. Except for the evaluation, developability, image area retention, development residue suppression, printing durability, ink deposition, and abrasion suppression were evaluated in the same manner as described above. It described in.
  • Examples 4-1 to 4-5 and Comparative Examples 4-1 to 4-6 Using the two-layer lithographic printing plate precursor obtained by the same method as in Examples 2-1 to 2-6 and Comparative examples 2-1 to 2-6, changing developer 1 to developer 3 shown below. Except for the evaluation, developability, image area retention, development residue suppression, printing durability, ink deposition, and abrasion suppression were evaluated in the same manner as described above. It described in.
  • the positive lithographic printing plate precursor according to the present disclosure and the positive lithographic printing having the image recording layer formed using the positive photosensitive resin composition according to the present disclosure are shown. It can be seen that the plate master is excellent in ablation suppression. Further, the positive type lithographic printing plate precursor in the examples, and the positive type lithographic printing plate precursor having an image recording layer formed using the positive photosensitive resin composition in the examples, developability, image portion retention It can also be seen that they are excellent in suppression of development scum, printing durability and ink deposition.

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Abstract

L'invention concerne un précurseur positif de plaque d'impression lithographique ayant un support et une couche d'enregistrement d'image formée sur le support, la couche d'enregistrement d'image comprenant une unité structurale ayant un groupe acide ayant un pKa de 7 ou moins, et une unité structurale ayant un groupe basique, le précurseur contenant : un polymère liant qui est une résine de type polymérisation par addition dans laquelle au moins l'un des groupes que sont le groupe acide de l'unité structurale ayant le groupe acide et le groupe basique de l'unité structurale ayant le groupe basique se lie à une chaîne principale par l'intermédiaire d'un groupe de liaison ; et un absorbeur d'infrarouges. L'invention concerne également une composition de résine photosensible positive et un procédé de production d'une plaque d'impression lithographique utilisant le précurseur positif de plaque d'impression lithographique.
PCT/JP2019/023255 2018-06-27 2019-06-12 Précurseur positif de plaque d'impression lithographique, procédé de production de plaque d'impression lithographique et composition de résine photosensible positive WO2020004035A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6138568A (en) * 1997-02-07 2000-10-31 Kodak Polcyhrome Graphics Llc Planographic printing member and process for its manufacture
JP2004125877A (ja) * 2002-09-30 2004-04-22 Fuji Photo Film Co Ltd 平版印刷版の現像処理方法
JP2004361483A (ja) * 2003-06-02 2004-12-24 Fuji Photo Film Co Ltd 感光性組成物
JP2006267721A (ja) * 2005-03-24 2006-10-05 Kodak Polychrome Graphics Japan Ltd 感光性平版印刷版
JP2007245648A (ja) * 2006-03-17 2007-09-27 Fujifilm Corp 平版印刷版原版および平版印刷方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6138568A (en) * 1997-02-07 2000-10-31 Kodak Polcyhrome Graphics Llc Planographic printing member and process for its manufacture
JP2004125877A (ja) * 2002-09-30 2004-04-22 Fuji Photo Film Co Ltd 平版印刷版の現像処理方法
JP2004361483A (ja) * 2003-06-02 2004-12-24 Fuji Photo Film Co Ltd 感光性組成物
JP2006267721A (ja) * 2005-03-24 2006-10-05 Kodak Polychrome Graphics Japan Ltd 感光性平版印刷版
JP2007245648A (ja) * 2006-03-17 2007-09-27 Fujifilm Corp 平版印刷版原版および平版印刷方法

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