WO2013027590A1 - 平版印刷版原版及び平版印刷版の作製方法 - Google Patents
平版印刷版原版及び平版印刷版の作製方法 Download PDFInfo
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- WO2013027590A1 WO2013027590A1 PCT/JP2012/070292 JP2012070292W WO2013027590A1 WO 2013027590 A1 WO2013027590 A1 WO 2013027590A1 JP 2012070292 W JP2012070292 W JP 2012070292W WO 2013027590 A1 WO2013027590 A1 WO 2013027590A1
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- FBOJXFNZDVRYQZ-UHFFFAOYSA-L triphenyl(7-triphenylphosphaniumylheptyl)phosphanium;sulfate Chemical compound [O-]S([O-])(=O)=O.C=1C=CC=CC=1[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)CCCCCCC[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 FBOJXFNZDVRYQZ-UHFFFAOYSA-L 0.000 description 1
- ZELVAMAIJBWLCX-UHFFFAOYSA-N triphenyl(9-triphenylphosphaniumylnonyl)phosphanium Chemical compound C=1C=CC=CC=1[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)CCCCCCCCC[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 ZELVAMAIJBWLCX-UHFFFAOYSA-N 0.000 description 1
- SOBHUZYZLFQYFK-UHFFFAOYSA-K trisodium;hydroxy-[[phosphonatomethyl(phosphonomethyl)amino]methyl]phosphinate Chemical compound [Na+].[Na+].[Na+].OP(O)(=O)CN(CP(O)([O-])=O)CP([O-])([O-])=O SOBHUZYZLFQYFK-UHFFFAOYSA-K 0.000 description 1
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Images
Classifications
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- 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
- G03F7/092—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by backside coating or layers, by lubricating-slip layers or means, by oxygen barrier layers or by stripping-release layers or means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
- B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
- B41C1/1016—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers
-
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
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- 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
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- 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
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- 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
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- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
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Definitions
- the present invention relates to a lithographic printing plate precursor and a lithographic printing plate preparation method capable of direct plate making using various lasers from a digital signal from a computer or the like, particularly a lithographic printing plate precursor and a lithographic printing plate suitable for simple processing. It relates to a manufacturing method.
- Solid-state lasers, semiconductor lasers, and gas lasers that emit ultraviolet light, visible light, and infrared light with wavelengths of 300 nm to 1200 nm are easily available in high output and small size. It is very useful as a recording light source when making a plate directly from digital data.
- Various researches have been made on recording materials sensitive to these various laser beams.
- As typical examples firstly, as materials that can be recorded with an infrared laser having an image recording wavelength of 760 nm or more, positive recording materials and acid-catalyzed crosslinking are used.
- Type negative recording material As typical examples, firstly, as materials that can be recorded with an infrared laser having an image recording wavelength of 760 nm or more, positive recording materials and acid-catalyzed crosslinking are used.
- Type negative recording material there is a radical polymerization type negative recording material and the like as a recording material for 300 nm to 700 nm ultraviolet light or visible light laser.
- a step (development treatment) of dissolving and removing a non-image portion using a strong alkaline aqueous solution is indispensable and developed.
- a post-treatment step is also required in which the printing plate is washed with water, treated with a rinse solution containing a surfactant, or treated with a desensitizing solution containing gum arabic or starch derivatives.
- these additional wet treatments are indispensable is a big problem for the conventional PS plate. Even if the first half (image exposure) of the plate making process is simplified by the digital processing, the effect of the simplification is insufficient in the wet processing in which the second half (development processing) is complicated.
- the wet post-treatment is preferably simplified or changed to a dry treatment.
- a method for simplifying the processing step there is a one-liquid process or a one-bath process in which development and gum solution processing are performed simultaneously. That is, after image exposure of the printing plate precursor without performing the pre-water washing step, the protective layer is removed, the non-image area is removed, and the gum solution treatment is simultaneously performed in one liquid or one bath, and the post-water washing step is not performed.
- This is a simple development method that enters the printing process.
- a lithographic printing plate precursor suitable for such simple development has an image recording layer that is soluble in a processing solution that is not strongly alkaline, and improves the stain resistance of non-image areas, because the post-washing step is omitted. Therefore, a hydrophilic support surface is required.
- Patent Documents 1 and 2 are known as such lithographic printing plate precursors.
- Patent Document 1 gives a characteristic to the protective layer, and the means to be solved is completely different from the present invention. Further, Patent Document 1 describes that a binder corresponding to the binder used in the undercoat layer of the present invention is used in the image forming layer, but does not describe use in the undercoat layer. Furthermore, paragraph number 0103 of Patent Document 1 describes that the binder has a hydrophobic substituent. When such a hydrophobic binder polymer is used for the undercoat layer, it may cause development failure or stain resistance deterioration particularly in weak alkali treatment or on-press development type lithographic printing plates. If it is a trader, it is not usually done.
- an object of the present invention is to provide a method for producing a lithographic printing plate precursor and a lithographic printing plate excellent in printing durability, stain resistance, and developability. .
- a lithographic printing comprising an undercoat layer and an image recording layer in this order on a support, wherein the undercoat layer comprises a polymer (A) containing a repeating unit represented by the general formula (1) Version original edition.
- General formula (1) (In the general formula (1), R and R ′ are each a hydrogen atom, a halogen atom or a methyl group, and L is —C ( ⁇ O) —NR 0 — (R 0 is a hydrogen atom or a substituent).
- a and X are each a monovalent organic group, and at least one of A and X has a carboxyl group or a salt thereof, And at least one of A and X is an organic group having an ethylenically unsaturated bond.)
- the polymer (A) comprises a repeating unit represented by the general formula (2) and / or a repeating unit represented by the general formula (3).
- R 1 , R 2 and R 3 are each a hydrogen atom, a halogen atom or a methyl group, X 1 is —O— or —N (R 7 ) —, and R 7 Is a hydrogen atom or an alkyl group which may have a substituent, L 1 represents a divalent linking group, and L 2 represents a divalent linking group which may have a single bond or a substituent.
- R 4 , R 5, and R 6 are each a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an alkyl group that may have a substituent, or an aryl group, and the substituent that L 2 has, At least one of R 4 , R 5, and R 6 is a carboxyl group or a salt thereof, or a group substituted with a carboxyl group or a salt thereof, and the substituent that L 2 has, R 4 , R 5 and any two or more binding together of R 6 It may form a ring.
- R 101 and R 102 are each a hydrogen atom, a halogen atom or a methyl group; Y 101 is —CO—O— or —CO—N (R 107 ) —; 107 is an alkyl group which may have a hydrogen atom or a substituent, R 103 is an alkyl group which may have a hydrogen atom or a substituent, L
- the polymer (A) is at least one of a repeating unit represented by the general formula (3), a repeating unit represented by the general formula (4), and a repeating unit represented by the general formula (5).
- R 101 and R 102 are each a hydrogen atom, a halogen atom or a methyl group; Y 101 is —CO—O— or —CO—N (R 107 ) —; 107 is a hydrogen atom or an alkyl group which may have a substituent, L 101 is a divalent linking group, and L 102 represents a divalent linking group which may have a single bond or a substituent.
- R 104 , R 105 , and R 106 are each a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, or an alkyl group or an aryl group which may have a substituent, and L 102 , R Any one of 104 , R 105 and R 106 may be bonded to each other to form a ring, L 103 represents a single bond or a divalent linking group which may have a substituent, and M represents Hydrogen or It represents the valence of the metal ion or an ammonium.)
- R 11 , R 12 and R 13 are each a hydrogen atom, a halogen atom or a methyl group, X 11 is —O— or —N (R 16 ) —, R 16 is a hydrogen atom or an alkyl group that may have a substituent, L 11 is a divalent linking group, and L 12 is a divalent linking that may have a
- R 14 and R 15 represent a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an alkyl group or an aryl group which may have a substituent, and L 12 , R 14 and R 15, respectively.
- R 21 , R 22 and R 23 are each a hydrogen atom, a halogen atom or a methyl group
- X 21 is —O— or —N (R 26 ) —
- R 26 represents hydrogen or an alkyl group which may have a substituent
- L 21 represents a divalent linking group
- L 22 represents a single bond or a divalent linking group which may have a substituent.
- R 24 and R 25 are each a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an optionally substituted alkyl group or an aryl group, and any one of L 22 , R 24 and R 25 Two or more may be bonded to each other to form a ring, and M represents a hydrogen atom, a monovalent metal ion, or ammonium.
- the polymer (A) further includes (a2) a repeating unit having a structure interacting with the support surface in the side chain and / or (a3) a repeating unit having a hydrophilic group in the side chain.
- the repeating unit (a2) having a structure that interacts with the surface of the support in the side chain has at least one of the structures represented by the following general formulas (a2-1) to (a2-6):
- M 21 and M 22 are each hydrogen. It represents an atom, a metal atom contained in an alkali metal or alkaline earth metal, or ammonium.
- R 21 to R 23 each independently represents a hydrogen atom or an alkyl group.
- Y 2 is a single bond or a divalent linkage selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof. Represents a group. * Represents a site connected to the main chain of the polymer compound. ] ⁇ 6>
- the repeating unit (a3) having a hydrophilic group in the side chain has any of the structures represented by the following general formula (a3-1) and / or (a3-2) in the side chain.
- the lithographic printing plate precursor as described in 4> or ⁇ 5>.
- R 31 and R 32 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group, and R 31 and R 32 are They may be linked to form a ring structure, L 31 represents a linking group, and A ⁇ represents a structure having an anion. Y 3 represents a divalent linking group linked to the main chain of the polymer compound. * Represents a site connected to the main chain of the polymer compound. ] [In General Formula (a3-2), L 32 represents a linking group, and E + represents a structure having a cation.
- Y 4 represents a single bond or a divalent linking group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof.
- * Represents a site connected to the main chain of the polymer compound.
- (A2) a repeating unit having in the side chain one or more of the structures represented by general formulas (a2-1) to (a2-6) [In the general formulas (a2-1), (a2-2), (a2-3), (a2-4), (a2-5) and (a2-6), M 21 and M 22 are each hydrogen. It represents an atom, a metal atom contained in an alkali metal or alkaline earth metal, or ammonium. R 21 to R 23 each independently represents a hydrogen atom or an alkyl group.
- Y 2 is a single bond or a divalent linkage selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof. Represents a group.
- R 31 and R 32 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group, and R 31 and R 32 are They may be linked to form a ring structure, L 31 represents a linking group, and A ⁇ represents a structure having an anion.
- Y 3 represents a divalent linking group linked to the main chain of the polymer compound. * Represents a site connected to the main chain of the polymer compound.
- L 32 represents a linking group
- E + represents a structure having a cation
- Y 4 represents a single bond or a divalent linking group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof.
- * Represents a site connected to the main chain of the polymer compound.
- L 1 in the general formula (2), L 101 in the general formula (3), L 11 in the general formula (4), L 21 in the general formula (5) is a divalent aliphatic group, L 2 in the general formula (2), L 102 in the general formula (3), L 12 in the general formula (4), and L 22 in the general formula (5) are a single bond or a divalent aliphatic group.
- ⁇ 10> The lithographic printing plate precursor as described in any one of ⁇ 1> to ⁇ 9>, wherein the image recording layer can be removed with an aqueous solution having a pH of 2 to 14.
- ⁇ 11> The lithographic printing plate precursor as described in any one of ⁇ 1> to ⁇ 10>, wherein the image recording layer is removable with at least one of printing ink and fountain solution.
- ⁇ 12> The step of exposing the lithographic printing plate precursor according to any one of ⁇ 1> to ⁇ 11> imagewise, and the exposed lithographic printing plate precursor to a developer having a pH of 2 to 14 And a step of removing the image recording layer in the non-exposed area in the presence of the lithographic printing plate.
- ⁇ 13> including a step of forming a protective layer on the surface of the image recording layer opposite to the support;
- the development step further includes a step of simultaneously removing the image recording layer and the protective layer in the non-exposed area in the presence of the developer containing the surfactant (however, the water washing step is not included).
- ⁇ 12> The manufacturing method of the lithographic printing plate as described in ⁇ 12>.
- ⁇ 14> a step of imagewise exposing the lithographic printing plate precursor as described in any one of ⁇ 1> to ⁇ 11>;
- a method for producing a lithographic printing plate comprising: supplying printing ink and fountain solution on a printing machine to remove the image recording layer in the non-exposed portion.
- a copolymer comprising the following (a1) to (a3): (A1) Repeating unit general formula (1) represented by general formula (1) (In the general formula (1), R and R ′ are each a hydrogen atom, a halogen atom or a methyl group, and L is —C ( ⁇ O) —NR 0 — (R 0 is a hydrogen atom or a substituent).
- a and X are each a monovalent organic group, and at least one of A and X has a carboxyl group or a salt thereof, And at least one of A and X is an organic group having an ethylenically unsaturated bond.
- (A2) a repeating unit having in the side chain one or more of the structures represented by general formulas (a2-1) to (a2-6) [In the general formulas (a2-1), (a2-2), (a2-3), (a2-4), (a2-5) and (a2-6), M 21 and M 22 are each hydrogen. It represents an atom, a metal atom contained in an alkali metal or alkaline earth metal, or ammonium.
- R 21 to R 23 each independently represents a hydrogen atom or an alkyl group.
- Y 2 is a single bond or a divalent linkage selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof. Represents a group. * Represents a site connected to the main chain of the polymer compound.
- R 31 and R 32 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group
- R 31 and R 32 are They may be linked to form a ring structure
- L 31 represents a linking group
- a ⁇ represents a structure having an anion.
- Y 3 represents a divalent linking group linked to the main chain of the polymer compound. * Represents a site connected to the main chain of the polymer compound.
- L 32 represents a linking group
- E + represents a structure having a cation.
- Y 4 represents a single bond or a divalent linking group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof.
- * Represents a site connected to the main chain of the polymer compound.
- ⁇ 16> The copolymer according to ⁇ 15>, wherein the repeating unit represented by the general formula (1) is a repeating unit represented by the general formula (4) or a repeating unit represented by the general formula (5). .
- R 11 , R 12 and R 13 are each a hydrogen atom, a halogen atom or a methyl group
- X 11 is —O— or —N (R 16 ) —
- R 16 is a hydrogen atom or an alkyl group which may have a substituent
- L 11 is a divalent linking group
- L 12 is a divalent linking which may have a single bond or a substituent
- R 14 and R 15 are a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an alkyl group or an aryl group which may have a substituent
- L 12 , R 14 and R 15 respectively.
- R 21 , R 22 and R 23 are each a hydrogen atom, a halogen atom or a methyl group
- X 21 is —O— or —N (R 26 ) —
- R 26 represents hydrogen or an alkyl group that may have a substituent
- L 21 represents a divalent linking group
- L 22 represents a single bond or a divalent linking group that may have a substituent.
- R 24 and R 25 are each a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an optionally substituted alkyl group or an aryl group, and any one of L 22 , R 24 and R 25 Two or more may be bonded to each other to form a ring, and M represents a hydrogen atom, a monovalent metal ion, or ammonium.
- 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
- the lithographic printing plate precursor according to the invention comprises a polymer (A ).
- the polymer (A) contains a repeating unit represented by the general formula (1), may contain other repeating units, and (a2) a repeating unit having a structure that interacts with the support surface in the side chain. And / or (a3) preferably containing a repeating unit having a hydrophilic group in the side chain.
- R and R ′ are each a hydrogen atom, a halogen atom or a methyl group, and L is —C ( ⁇ O) —NR 0 — (R 0 is a hydrogen atom or a substituent).
- a and X are each a monovalent organic group, and at least one of A and X has a carboxyl group or a salt thereof, And at least one of A and X is an organic group having an ethylenically unsaturated bond.
- the repeating unit represented by the general formula (1) preferably has a —NH—C ( ⁇ O) — structure, and two or more —NH—C ( ⁇ O) — structures are included in one repeating unit. More preferably. L is preferably a divalent linking group containing an amide bond.
- the polymer (A) preferably contains a repeating unit represented by the general formula (2) and / or a repeating unit represented by the general formula (3).
- General formula (2) (In the general formula (2), R 1 , R 2 and R 3 are each a hydrogen atom, a halogen atom or a methyl group, X 1 is —O— or —N (R 7 ) —, and R 7 Is a hydrogen atom or an alkyl group which may have a substituent, L 1 represents a divalent linking group, and L 2 represents a divalent linking group which may have a single bond or a substituent.
- R 4 , R 5, and R 6 are each a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an alkyl group that may have a substituent, or an aryl group, and the substituent that L 2 has, At least one of R 4 , R 5, and R 6 is a carboxyl group or a salt thereof, or a group substituted with a carboxyl group or a salt thereof, and the substituent that L 2 has, R 4 , R 5 and any two or more binding together of R 6 It may form a ring.
- the repeating unit represented by the general formula (2) preferably has one or more amide bonds, more preferably two.
- R 1 , R 2 and R 3 are each preferably a hydrogen atom or a methyl group.
- R 1 , R 2 and R 3 are halogen atoms, a fluorine atom, a chlorine atom and a bromine atom are preferable, and a fluorine atom is more preferable.
- X 1 is preferably —N (R 7 ) —.
- R 7 is preferably a hydrogen atom.
- L 1 is preferably a divalent linking group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof, —O—
- a divalent linking group selected from the group consisting of a divalent aliphatic group, a divalent aromatic group, and combinations thereof is more preferable, and consists of —O—, a divalent aliphatic group, and combinations thereof.
- a divalent linking group selected from the group is more preferred, a divalent aliphatic group is particularly preferred, and a linear alkylene group is more preferred.
- the divalent aliphatic group means an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, an alkynylene group, a substituted alkynylene group or a polyalkyleneoxy group.
- an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, and a polyalkyleneoxy group are preferable, and an alkylene group, a substituted alkylene group, and a polyalkyleneoxy group are more preferable.
- the divalent aliphatic group preferably has a chain structure rather than a cyclic structure, and more preferably has a straight chain structure than a branched chain structure.
- the number of carbon atoms in the divalent aliphatic group is preferably 1-20, more preferably 1-15, still more preferably 1-12, and even more preferably 1-10. It is preferably 1 to 8, more preferably 1 to 4, and particularly preferably 1 to 4.
- substituent of the divalent aliphatic group include halogen atom (F, Cl, Br, I), hydroxy group, carboxy group, amino group, cyano group, aryl group, alkoxy group, aryloxy group, monoalkyl Examples thereof include an amino group, a dialkylamino group, an arylamino group, and a diarylamino group.
- Examples of the divalent aromatic group include a phenylene group, a substituted phenylene group, a naphthalene group, and a substituted naphthalene group, and a phenylene group is preferable.
- Examples of the substituent for the divalent aromatic group include an alkyl group in addition to the examples of the substituent for the divalent aliphatic group.
- L 2 is preferably a single bond or a divalent group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof.
- a linking group more preferably a single bond or a divalent aliphatic group.
- the divalent aliphatic group preferably has a chain structure rather than a cyclic structure, and more preferably has a straight chain structure than a branched chain structure.
- the number of carbon atoms in the divalent aliphatic group is preferably 1-20, more preferably 1-15, still more preferably 1-12, and even more preferably 1-10. It is preferably 1 to 8, more preferably 1 to 4, and particularly preferably 1 to 4.
- Examples of the substituent of the divalent aliphatic group include halogen atom (F, Cl, Br, I), hydroxy group, carboxy group, amino group, cyano group, aryl group, alkoxy group, aryloxy group, monoalkyl Examples thereof include an amino group, a dialkylamino group, an arylamino group, and a diarylamino group.
- Examples of the divalent aromatic group include a phenylene group, a substituted phenylene group, a naphthalene group, and a substituted naphthalene group, and a phenylene group is preferable.
- Examples of the substituent for the divalent aromatic group include an alkyl group in addition to the examples of the substituent for the divalent aliphatic group.
- R 4 to R 6 are each preferably a hydrogen atom, a carboxyl group or an optionally substituted alkyl group or aryl group having 1 to 50 carbon atoms, and a hydrogen atom, a carboxyl group or an optionally substituted carbon atom is 1 More preferred is an alkyl group having ⁇ 40, an aryl group, a hydrogen atom or an optionally substituted alkyl group having 1 to 30 carbon atoms, further preferred is a hydrogen atom or a methyl group. Any two or more of L 2 , R 4 , R 5 and R 6 may be bonded to each other to form a ring. Two groups may be bonded to form one ring, or three or more groups may be bonded to form a condensed ring. Further, there may be two rings formed by combining two groups. A case where two groups are bonded to form one ring is preferable.
- R 101 and R 102 are each a hydrogen atom, a halogen atom or a methyl group; Y 101 is —CO—O— or —CO—N (R 107 ) —; 107 is an alkyl group which may have a hydrogen atom or a substituent, R 103 is an alkyl group which may have a hydrogen atom or a substituent, L 101 is a divalent linking group, and L 102 Represents a single bond or a divalent linking group which may have a substituent, wherein R 104 , R 105 , and R 106 each represent a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, or a substituent.
- the have is also an alkyl group or an aryl group
- L 102, R 104, R 105, may .L 103 be any two or more bonded to each other to form a ring
- R 106 is Tan'yui Or a divalent linking group optionally having a substituent
- M represents hydrogen, a monovalent metal ion or ammonium.
- the repeating unit represented by the general formula (3) preferably has one or more amide bonds, and more preferably has two.
- R 101 and R 102 each preferably represents hydrogen or a methyl group.
- Y 101 is preferably —CO—N (R 107 ) —.
- R 107 and R 103 preferably represent a hydrogen atom.
- L 101 has the same meaning as L 1 in the general formula (2), the preferred range is also the same.
- L 102 has the same meaning as L 2 in formula (2), the preferred range is also the same.
- R 104 to R 106 have the same meaning as R 4 in formula (2), and the preferred range is also the same. Any two or more of L 102 , R 104 , R 105 and R 106 may be bonded to each other to form a ring. Two groups may be bonded to form one ring, or three or more groups may be bonded to form a condensed ring. Further, there may be two rings formed by combining two groups. A case where two groups are bonded to form one ring is preferable.
- M represents a hydrogen atom, a monovalent metal ion, or ammonium.
- monovalent metal ions include lithium ions, sodium ions, potassium ions, and the like.
- hydrogen atoms, sodium ions, or potassium ions are preferable, and hydrogen atoms or sodium ions are more preferable.
- the repeating unit represented by the general formula (2) is preferably a repeating unit represented by the following general formula (4) or a repeating unit represented by the general formula (5).
- General formula (4) (In the general formula (4), R 11 , R 12 and R 13 are each a hydrogen atom, a halogen atom or a methyl group, X 11 is —O— or —N (R 16 ) —, R 16 is a hydrogen atom or an alkyl group which may have a substituent, L 11 is a divalent linking group, and L 12 is a divalent linking which may have a single bond or a substituent.
- R 14 and R 15 are a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an alkyl group or an aryl group which may have a substituent, and L 12 , R 14 and R 15, respectively. Any two or more of these may be bonded to each other to form a ring, and M represents a hydrogen atom, a monovalent metal ion or ammonium.
- the repeating unit represented by the general formula (4) preferably has one or more amide bonds, more preferably two.
- R 11 , R 12 and R 13 each preferably represents a hydrogen atom or a methyl group.
- X 11 is preferably —N (R 16 ) —.
- R 16 is preferably a hydrogen atom.
- L 11 is there in the general formula (2) L 1 synonymous, and the preferred range is also the same.
- L 12 is there in the general formula (2) with L 2 synonymous, and the preferred range is also the same.
- R 14 and R 15 has the same meaning as R 4 in the general formula (2), the preferred range is also the same. Any two or more of L 12 , R 14 and R 15 may be bonded to each other to form a ring. Two groups may be bonded to form one ring, or three or more groups may be bonded to form a condensed ring.
- M represents a hydrogen atom, a monovalent metal ion, or ammonium.
- monovalent metal ions include lithium ions, sodium ions, potassium ions, and the like.
- M is preferably a hydrogen atom, sodium ion, or potassium ion, and more preferably a hydrogen atom or sodium ion.
- R 21 , R 22 and R 23 are each a hydrogen atom, a halogen atom or a methyl group
- X 21 is —O— or —N (R 26 ) —
- R 26 represents hydrogen or an alkyl group that may have a substituent
- L 21 represents a divalent linking group
- L 22 represents a single bond or a divalent linking group that may have a substituent.
- R 24 and R 25 are each a hydrogen atom, a halogen atom, a carboxyl group, a hydroxyl group, an optionally substituted alkyl group or an aryl group, and any one of L 22 , R 24 and R 25 Two or more may be bonded to each other to form a ring, and M represents a hydrogen atom, a monovalent metal ion, or ammonium.
- the repeating unit represented by the general formula (5) preferably has one or more amide bonds, more preferably two.
- R 21 , R 22 and R 23 each preferably represents a hydrogen atom or a methyl group.
- X 21 is preferably —N (R 26 ) —.
- R 26 is preferably a hydrogen atom.
- L 21 is there in the general formula (2) L 1 synonymous, and the preferred range is also the same.
- L 22 is there in the general formula (2) with L 2 synonymous, and the preferred range is also the same.
- R 24 and R 25 are respectively synonymous with R 4 in the general formula (2), and preferred ranges are also synonymous. Any two or more of L 22 , R 24 and R 25 may be bonded to each other to form a ring. Two groups may be bonded to form one ring, or three or more groups may be bonded to form a condensed ring.
- M represents a hydrogen atom, a monovalent metal ion, or ammonium.
- monovalent metal ions include lithium ions, sodium ions, potassium ions, and the like.
- M is preferably a hydrogen atom, sodium ion, or potassium ion, and more preferably a hydrogen atom or sodium ion.
- the polymer used in the present invention preferably contains (a2) a repeating unit having a structure interacting with the support surface in the side chain and / or (a3) a repeating unit having a hydrophilic group in the side chain.
- the polymer (A) used in the present invention has adhesiveness to the repeating unit support having a structure that interacts with the support surface in the side chain.
- it preferably contains a repeating unit having a structure interacting with the support surface in the side chain, and any one of the structures represented by the following general formulas (a2-1) to (a2-6) It is more preferable to include a repeating unit having the above in the side chain.
- M 21 and M 22 are each hydrogen. It represents an atom, a metal atom contained in an alkali metal or alkaline earth metal, or ammonium.
- R 21 to R 23 each independently represents a hydrogen atom or an alkyl group.
- Y 2 is a single bond or a divalent linkage selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof. Represents a group. * Represents a site connected to the main chain of the polymer compound. ]
- Examples of the alkyl group represented by R 21 to R 23 include a methyl group, an ethyl group, a propyl group, an octyl group, an isopropyl group, a tert-butyl group, an isopentyl group, a 2-ethylhexyl group, a 2-methylhexyl group, and a cyclopentyl group.
- Etc. R 21 to R 23 are preferably a hydrogen atom or a methyl group.
- Y 2 represents a single bond or a divalent linking group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof.
- Y 2 composed of the above combinations are given below.
- the left side is bonded to the main chain.
- -L 1- -CO-O-2 valent aliphatic group- -L 2- : -CO-O-2 valent aromatic group- -L 3- : -CO-NH-divalent aliphatic group- -L 4 -: - CO-NH -2 -valent aromatic group -
- the divalent aliphatic group means an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, an alkynylene group, a substituted alkynylene group or a polyalkyleneoxy group.
- an alkylene group, a substituted alkylene group, an alkenylene group, and a substituted alkenylene group are preferable, and an alkylene group and a substituted alkylene group are more preferable.
- the divalent aliphatic group preferably has a chain structure rather than a cyclic structure, and more preferably has a straight chain structure than a branched chain structure.
- the number of carbon atoms in the divalent aliphatic group is preferably 1-20, more preferably 1-15, still more preferably 1-12, and even more preferably 1-10. It is preferably 1 to 8, particularly preferably 1 to 4.
- substituent of the divalent aliphatic group include a halogen atom (F, Cl, Br, I), a hydroxy group, a carboxy group, an amino group, a cyano group, an aryl group, an alkoxy group, an aryloxy group, and an acyl group.
- Examples of the divalent aromatic group include a phenylene group, a substituted phenylene group, a naphthalene group, and a substituted naphthalene group, and a phenylene group is preferable.
- Examples of the substituent for the divalent aromatic group include an alkyl group in addition to the examples of the substituent for the divalent aliphatic group.
- the Y 2 a single bond, a divalent aromatic group, -L 1 -, - L 2 -, - L 3 - and -L 4 -, more preferably a single bond, -L 1 - and -L 2 - is Most preferred.
- the structure that interacts with the support surface is preferably (a2-1), (a2-2), (a2-6), (a2-1), (A2-2) is more preferable.
- M 21 and M 22 are preferably hydrogen atoms. Specifically, the following structures can be mentioned. Needless to say, the present invention is not limited to the following structure.
- the repeating unit having a structure that interacts with the support surface in the side chain is preferably a repeating unit represented by the following general formula (A2).
- R a to R c each represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom.
- (A2) represents a structure represented by general formulas (a2-1) to (a2-6), and is a carbon atom at a site represented by * in general formulas (a2-1) to (a2-6). Link.
- the ratio of the repeating unit (a2) having a structure represented by the general formulas (a2-1) to (a2-6) is all from the viewpoint of stain resistance and developability. It is preferably in the range of 1 to 99 mol% of the repeating unit, more preferably in the range of 1 to 90 mol%, and still more preferably in the range of 1 to 80 mol%.
- the polymer (A) used in the present invention has at least 1 hydrophilic group as (a3) in order to make the support surface of the non-image area highly hydrophilic. You may have a repeating unit contained in one side chain.
- Hydrophilic groups are those that easily form hydrogen bonds, van der Waals bonds, and ionic bonds with water molecules. Specifically, hydroxy groups, carboxyl groups, amino groups, sulfo groups, positive or negative charges , Zwitterionic groups and metal salts thereof. These hydrophilic groups may also serve as a repeating unit (a2) having a structure that interacts with the support surface in the side chain.
- the polymer used in the present invention preferably has a repeating unit containing a zwitterionic structure as a hydrophilic group in order to make the support surface of the non-image area highly hydrophilic.
- the side chain having a zwitterionic structure is particularly preferably represented by the following general formula (a3-1) or (a3-2).
- R 31 and R 32 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group, and R 31 and R 32 are They may be linked to form a ring structure, L 31 represents a linking group, and A ⁇ represents a structure having an anion.
- Y 3 represents a divalent linking group linked to the main chain of the polymer compound. * Represents a site connected to the main chain of the polymer compound.
- the ring structure formed by connecting R 31 and R 32 to each other may have a heteroatom such as an oxygen atom, and is preferably a 5- to 10-membered ring, more preferably a 5- or 6-membered ring.
- the carbon number of R 31 and R 32 is preferably 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, and more preferably 1 to 15 carbon atoms, including the carbon number of the substituent which may be described later. More preferably, 1 to 8 carbon atoms are even more preferable, and 1 to 4 carbon atoms are particularly preferable.
- Examples of the alkyl group represented by R 31 and R 32 include methyl group, ethyl group, propyl group, octyl group, isopropyl group, tert-butyl group, isopentyl group, 2-ethylhexyl group, 2-methylhexyl group, A cyclopentyl group etc. are mentioned.
- Examples of the alkenyl group represented by R 31 and R 32 include a vinyl group, an allyl group, a prenyl group, a geranyl group, and an oleyl group.
- Examples of alkynyl groups represented by R 31 and R 32 include ethynyl group, propargyl group, trimethylsilylethynyl group and the like.
- Examples of the aryl group represented by R 31 and R 32 include a phenyl group, 1-naphthyl group, 2-naphthyl group and the like. Furthermore, examples of the heterocyclic group include a furanyl group, a thiophenyl group, and a pyridinyl group.
- These groups may further have a substituent.
- substituents include halogen atom (F, Cl, Br, I), hydroxy group, carboxy group, amino group, cyano group, aryl group, alkoxy group, aryloxy group, acyl group, alkoxycarbonyl group, aryloxy
- substituents include halogen atom (F, Cl, Br, I), hydroxy group, carboxy group, amino group, cyano group, aryl group, alkoxy group, aryloxy group, acyl group, alkoxycarbonyl group, aryloxy
- Examples include a carbonyl group, an acyloxy group, a monoalkylamino group, a dialkylamino group, a monoarylamino group, and a diarylamino group.
- R 31 and R 32 particularly preferable examples from the viewpoints of effects and availability can include a hydrogen atom, a methyl group, or an ethyl group, respectively.
- Examples of the divalent linking group linked to the main chain of the polymer compound represented by Y 3 include a single bond, —CO—, —O—, —NH—, a divalent aliphatic group, a divalent A divalent linking group selected from the group consisting of aromatic groups and combinations thereof is preferred.
- Y 3 comprising a combination of the following.
- the left side is bonded to the main chain.
- -L 1- -CO-O-2 valent aliphatic group- -L 2- : -CO-O-2 valent aromatic group- -L 3- : -CO-NH-divalent aliphatic group- -L 4 -: - CO-NH -2 -valent aromatic group -
- the divalent aliphatic group means an alkylene group, a substituted alkylene group, an alkenylene group, a substituted alkenylene group, an alkynylene group, a substituted alkynylene group or a polyalkyleneoxy group.
- an alkylene group, a substituted alkylene group, an alkenylene group, and a substituted alkenylene group are preferred, an alkylene group and a substituted alkylene group are more preferred, and an unsubstituted alkylene group is still more preferred.
- the divalent aliphatic group preferably has a chain structure rather than a cyclic structure, and more preferably has a straight chain structure than a branched chain structure.
- the number of carbon atoms in the divalent aliphatic group is preferably 1-20, more preferably 1-15, still more preferably 1-12, and even more preferably 1-10. It is preferably 1 to 8, particularly preferably 1 to 4.
- substituent of the divalent aliphatic group include a halogen atom (F, Cl, Br, I), a hydroxy group, a carboxy group, an amino group, a cyano group, an aryl group, an alkoxy group, an aryloxy group, and an acyl group.
- Examples of the divalent aromatic group include a phenylene group, a substituted phenylene group, a naphthalene group, and a substituted naphthalene group, and a phenylene group is preferable.
- Examples of the substituent for the divalent aromatic group include an alkyl group in addition to the examples of the substituent for the divalent aliphatic group.
- Y 3 is more preferably a single bond, —CO—, a divalent aliphatic group, a divalent aromatic group, or —L 1 — to —L 4 —. Further, from the viewpoint of stain resistance, Y 3 is preferably —L 1 — or —L 3 —, more preferably —L 3 —. Further, the divalent aliphatic group of -L 3- is preferably a linear alkylene group having 2 to 4 carbon atoms, and most preferably a linear alkylene group having 3 carbon atoms in terms of synthesis.
- L 31 represents a linking group, preferably a linking group composed of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof. Further, L 31, including the number of carbon atoms of the substituent which may have to be described later, is preferably 30 or less carbon atoms. Specific examples of the substituent include an alkylene group (preferably an alkylene group having 1 to 20 carbon atoms, more preferably an alkylene group having 1 to 10 carbon atoms, and still more preferably an alkylene group having 2 to 6 carbon atoms), and phenylene.
- L 31 is preferably a linear alkylene group having 3 to 5 carbon atoms, more preferably a linear alkylene group having 4 or 5 carbon atoms, and further preferably a linear alkylene group having 4 carbon atoms. Specific examples of L 31 include the following linking groups.
- these coupling groups may further have a substituent.
- substituents include halogen atoms (F, Cl, Br, I), hydroxy groups, carboxy groups, amino groups, cyano groups, aryl groups, alkoxy groups, aryloxy groups, acyl groups, alkoxycarbonyl groups, aryloxy Examples include a carbonyl group, an acyloxy group, a monoalkylamino group, a dialkylamino group, a monoarylamino group, and a diarylamino group.
- a - preferably represents a carboxylate, sulfonate, phosphonate, or phosphinate. Specifically, the following anions are mentioned.
- L 31 is a straight-chain alkylene group having 4 or 5 carbon atoms and A - is a combination of sulfonate are preferred, L 31 is a straight-chain alkylene group having 4 carbon atoms There, and a - is a combination of sulfonate is most preferred.
- Y 3 is -L 1 -or -L 3-
- R 31 and R 32 are each an ethyl group or a methyl group
- L 31 is a linear alkylene group having 4 or 5 carbon atoms.
- a - is a sulfonate group.
- R 31 and R 32 are each a methyl group
- L 31 is a straight-chain alkylene group having 4 carbon atoms
- a - - more Y 3 is -L 3 is more preferably a combination of sulfonate .
- the following structural formula is preferable.
- L 32 represents a linking group
- E + represents a structure having a cation
- Y 4 represents a single bond or a divalent linking group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof.
- * Represents a site connected to the main chain of the polymer compound.
- L 32 represents a linking group, preferably —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and the like.
- Selected from the group consisting of L 32 represents a linking group, preferably a linking group composed of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and combinations thereof.
- L 32 preferably has 30 or less carbon atoms, including the carbon number of a substituent that may be described later.
- substituents include an alkylene group (preferably an alkylene group having 1 to 20 carbon atoms, more preferably an alkylene group having 1 to 10 carbon atoms, and still more preferably an alkylene group having 2 to 6 carbon atoms), and phenylene.
- an arylene group such as a xylylene group (preferably an arylene group having 5 to 15 carbon atoms, more preferably an arylene group having 6 to 10 carbon atoms).
- L 32 is preferably a linear alkylene group having 1 to 5 carbon atoms, more preferably a linear alkylene group having 1 to 3 carbon atoms.
- L 32 include the following linking groups.
- these coupling groups may further have a substituent.
- substituents include halogen atoms (F, Cl, Br, I), hydroxy groups, carboxy groups, amino groups, cyano groups, aryl groups, alkoxy groups, aryloxy groups, acyl groups, alkoxycarbonyl groups, aryloxy Examples include a carbonyl group, an acyloxy group, a monoalkylamino group, a dialkylamino group, a monoarylamino group, and a diarylamino group.
- Y 4 has the same meaning as Y 3 in formula (a3-1), and a preferred range is also the same.
- E + represents a structure having a cation, and preferably represents a structure having ammonium, phosphonium, iodonium, or sulfonium. A structure having ammonium or phosphonium is more preferable, and a structure having ammonium is particularly preferable.
- Examples of the structure having a cation include trimethylammonio group, triethylammonio group, tributylammonio group, benzyldimethylammonio group, diethylhexylammonio group, (2-hydroxyethyl) dimethylammonio group, pyridinio group, N-methylimidazolio group, N-acridinio group, trimethylphosphonio group, triethylphosphonio group, triphenylphosphonio group and the like can be mentioned.
- L 32 is an alkylene group having 2 to 4 carbon atoms
- Y 4 is -L 1 -or -L 3-
- E + is trimethylammoni O group or triethylammonio group.
- the repeating unit (a3) having a hydrophilic group in the side chain is preferably represented by the following general formula (a3-3).
- R a to R c each independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom.
- W represents a divalent linking group having a hydrophilic group, or a structure represented by the general formula (a3-1) or the general formula (a3-2), and the general formula (a3-1) or the general formula (a3- 2) It is connected to a carbon atom at the site represented by *.
- the ratio of the repeating unit (a3) having the structure represented by the general formula (a3-1) or the general formula (a3-2) is determined from the viewpoint of stain resistance and developability.
- the range is preferably from 1 to 70 mol%, more preferably from 1 to 50 mol%, still more preferably from 1 to 30 mol%.
- the polymer may be a copolymer having a repeating unit other than the above repeating unit.
- the monomer that can be copolymerized with the polymer include acrylic acid esters, methacrylic acid esters, N, N-2 substituted acrylamides, N, N-2 substituted methacrylamides, styrenes, acrylonitriles, And monomers selected from methacrylonitriles.
- acrylic esters such as alkyl acrylate (the alkyl group preferably has 1 to 20 carbon atoms), (specifically, for example, methyl acrylate, ethyl acrylate, acrylic Propyl acrylate, butyl acrylate, amyl acrylate, ethyl hexyl acrylate, octyl acrylate, tert-octyl acrylate, chloroethyl acrylate, 2,2-dimethylhydroxypropyl acrylate, 5-hydroxypentyl acrylate, trimethylolpropane monoacrylate , Pentaerythritol monoacrylate, glycidyl acrylate, benzyl acrylate, methoxybenzyl acrylate, furfuryl acrylate, tetrahydrofurfuryl acrylate, etc.), aryl acrylate ( For example, methacrylic acid esters (eg, methyl methacrylate, acrylic Propyl acryl
- the polymer (A) in the present invention is, as another repeating unit, particularly represented by an alkyl ether chain (preferably — (CH 2 ) n —O— in the side chain, and n is 1 to 4 2 to 150 times, preferably from 9 to 150 times, more preferably from 9 to 100 times, still more preferably from 20 to 100 times, particularly preferably from 50 to 100 times, from the viewpoint of soiling properties. It is preferable to include a repeating unit having a repeated repeating unit. Furthermore, the thing of the structure represented with the following general formula is more preferable.
- R 51 to R 53 each represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom, preferably a hydrogen atom or a methyl group.
- R 54 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, more preferably a hydrogen atom, a methyl group or an ethyl group.
- n is an integer of 1 to 4, preferably an integer of 2 or 3.
- m represents an integer of 2 to 150, and is preferably 9 to 150, more preferably 9 to 100, still more preferably 20 to 100, and particularly preferably 50 to 100, from the viewpoint of dirtiness.
- the repeating unit having an alkyl ether chain in the side chain is preferably contained in the range of 0 to 20 mol% of the polymer (A). It is preferable to be included in the range of% by mass.
- the mass average molar mass (Mw) of the polymer (A) in the present invention can be arbitrarily set depending on the performance design of the lithographic printing plate precursor. From the viewpoint of printing durability and stain resistance, the mass average molar mass is preferably 2,000 to 1,000,000, more preferably 2,000 to 500,000, and 8,000 to 300,000. Most preferred is 000.
- the polymer (A) can be synthesized by a known method.
- a radical polymerization method and subsequent isocyanate groups having an amino group on the polymer side chain and a radical polymerization reactive group are used.
- the urea reaction is preferably used.
- General radical polymerization methods include, for example, New Polymer Experiments 3 (Polymer Society, edited by Kyoritsu Publishing, published on March 28, 1996), Polymer Synthesis and Reaction 1 (Polymer Society, edited by Kyoritsu Publishing, 1992). Published in May, 19), New Experimental Chemistry Course 19, Polymer Chemistry (I) (Edited by The Chemical Society of Japan, Maruzen, published on November 20, 1980), Materials Engineering Course, Synthetic Polymer Chemistry (Tokyo Denki University Press, (Issued in September 1995), etc., and these can be applied.
- the lithographic printing plate precursor according to the invention has an undercoat layer and an image recording layer in this order on a support. Furthermore, in the lithographic printing plate precursor according to the invention, other layers may optionally be provided between the support and the image recording layer.
- the lithographic printing plate precursor according to the invention preferably includes a protective layer on the surface of the image recording layer opposite to the support. Moreover, the lithographic printing plate precursor according to the invention can be provided with a backcoat layer on the back surface of the support, if necessary.
- the lithographic printing plate precursor according to the invention is preferably capable of so-called direct plate making, which can be directly made using various lasers from a digital signal from a computer or the like. Further, it is preferable that development is possible even in an aqueous solution of pH 2 to 14, more preferably pH 3.5 to 13, further preferably pH 6 to 13, particularly preferably pH 6.5 to 10.5, and a printing press. .
- the undercoat layer of the lithographic printing plate precursor according to the invention contains the polymer (A).
- the undercoat layer is formed by applying water on a support and drying a solution prepared by dissolving the above compound in water, an organic solvent such as methanol, ethanol, methyl ethyl ketone, or a mixed solvent thereof, or water, methanol, ethanol, methyl ethyl ketone.
- the above compound can be adsorbed by immersing the support in a solution obtained by dissolving the above compound in an organic solvent such as the above or a mixed solvent thereof, and then washed and dried with water or the like.
- a solution having the above compound concentration of 0.005 to 10% by mass can be applied by various methods.
- any method such as bar coater coating, spin coating, spray coating, or curtain coating may be used.
- the concentration of the solution is 0.01 to 20% by mass, preferably 0.05 to 5% by mass
- the immersion temperature is 20 to 90 ° C., preferably 25 to 50 ° C.
- the immersion time is Is 0.1 second to 20 minutes, preferably 2 seconds to 1 minute.
- the coating amount (solid content) of the undercoat layer is preferably 0.1 to 100 mg / m 2 , and more preferably 1 to 30 mg / m 2 . It is preferable that 90 mass% or more of solid content is a polymer (A).
- the image recording layer of the lithographic printing plate precursor according to the invention preferably contains (B) a polymerization initiator, (C) a polymerizable compound and (D) a binder, and (B) a polymerization initiator and (C) a polymerizable. It is further preferable to contain a compound, (D) a binder, and (E) a dye.
- the image recording layer of the invention preferably contains a polymerization initiator (hereinafter also referred to as an initiator compound).
- a radical polymerization initiator is preferably used.
- the initiator compound those known to those skilled in the art can be used without limitation, and specifically include, for example, trihalomethyl compounds, carbonyl compounds, organic peroxides, azo compounds, azide compounds, metallocene compounds, hexaarynes.
- examples include rubiimidazole compounds, organic boron compounds, disulfone compounds, oxime ester compounds, onium salts, and iron arene complexes.
- at least one selected from the group consisting of hexaarylbiimidazole compounds, onium salts, trihalomethyl compounds, and metallocene compounds is preferable, and hexaarylbiimidazole compounds and onium salts are particularly preferable.
- Two or more polymerization initiators may be used in combination as appropriate.
- hexaarylbiimidazole compound examples include lophine dimers described in European Patent No. 24629, European Patent No. 107792, and US Pat. No. 4,410,621, such as 2,2′-bis (o-chlorophenyl) -4,4.
- onium salt examples include S.I. I. Schlesinger, Photogr. Sci. Eng. , 18, 387 (1974), T.A. S. Bal et al, Polymer, 21, 423 (1980), diazonium salts described in JP-A-5-158230, ammonium described in US Pat. No. 4,069,055, JP-A-4-365049, and the like. Salt, phosphonium salts described in U.S. Pat. Nos. 4,069,055 and 4,069,056, EP 104,143, U.S. Patent Application Publication No. 2008/0311520 JP-A-2-150848, JP-A-2008-195018, or J.P. V.
- iodonium salts sulfonium salts and azinium salts are more preferable.
- specific example of these compounds is shown below, it is not limited to this.
- a diphenyliodonium salt is preferable, a diphenyliodonium salt substituted with an electron donating group such as an alkyl group or an alkoxyl group is particularly preferable, and an asymmetric diphenyliodonium salt is more preferable.
- diphenyliodonium hexafluorophosphate
- 4-methoxyphenyl-4- (2-methylpropyl) phenyliodonium hexafluorophosphate
- 4- (2-methylpropyl) phenyl-p-tolyliodonium hexa Fluorophosphate
- 4-hexyloxyphenyl-2,4,6-trimethoxyphenyliodonium hexafluorophosphate
- 4-hexyloxyphenyl-2,4-diethoxyphenyliodonium tetrafluoroborate
- 4-octyloxy Phenyl-2,4,6-trimethoxyphenyliodonium 1-perfluorobutanesulfonate
- 4-octyloxyphenyl-2,4,6-trimethoxyphenyliodonium hexafluorophosphate, bis ( -t- butylphenyl) iodonium
- polymerization initiators described in JP-A 2007-206217, paragraphs [0071] to [0129] can also be preferably used.
- the polymerization initiator is preferably used alone or in combination of two or more.
- the content of the polymerization initiator in the image recording layer is preferably 0.01 to 20% by mass, more preferably 0.1 to 15% by mass, and still more preferably 1. 0 to 10% by mass.
- the polymerizable compound used in the image recording layer is an addition polymerizable compound having at least one ethylenically unsaturated double bond, and preferably has at least one terminal ethylenically unsaturated bond, preferably It is selected from compounds having two or more. These have chemical forms such as monomers, prepolymers, ie dimers, trimers and oligomers, or mixtures thereof. Examples of monomers include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), esters and amides thereof, preferably unsaturated carboxylic acids.
- unsaturated carboxylic acids for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.
- esters and amides thereof preferably unsaturated carboxylic acids.
- Esters of an acid and a polyhydric alcohol compound and amides of an unsaturated carboxylic acid and a polyamine compound are used.
- addition reaction products of unsaturated carboxylic acid esters or amides having a nucleophilic substituent such as hydroxyl group, amino group, mercapto group and the like with monofunctional or polyfunctional isocyanates or epoxy, and monofunctional or polyfunctional A dehydration condensation reaction product with a functional carboxylic acid is also preferably used.
- an unsaturated carboxylic acid ester or amide having an electrophilic substituent such as an isocyanate group or an epoxy group and an addition reaction product of a monofunctional or polyfunctional alcohol, amine or thiol, a halogen group A substitution reaction product of an unsaturated carboxylic acid ester or amide having a leaving substituent such as a tosyloxy group and a monofunctional or polyfunctional alcohol, amine or thiol is also suitable. It is also possible to use a compound group in which the unsaturated carboxylic acid is replaced with unsaturated phosphonic acid, styrene, vinyl ether or the like.
- JP-T-2006-508380 JP-A-2002-287344, JP-A-2008-256850, JP-A-2001-342222, JP-A-9-179296, JP-A-9-179297.
- JP-A-9-179298 JP-A-2004-294935, JP-A-2006-243493, JP-A-2002-275129, JP-A-2003-64130, JP-A-2003-280187, This is described in, for example, Japanese Laid-Open Patent Publication No. 10-333321.
- monomers of the ester of the polyhydric alcohol compound and unsaturated carboxylic acid include acrylic acid esters such as ethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, and propylene glycol diacrylate. , Trimethylolpropane triacrylate, hexanediol diacrylate, tetraethylene glycol diacrylate, pentaerythritol tetraacrylate, sorbitol triacrylate, isocyanuric acid ethylene oxide (EO) modified triacrylate, polyester acrylate oligomer, and the like.
- acrylic acid esters such as ethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, and propylene glycol diacrylate.
- Trimethylolpropane triacrylate Trimethylolpropane triacrylate, hexanediol diacrylate, t
- Methacrylic acid esters include tetramethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, pentaerythritol trimethacrylate, bis [p- (3-methacryloxy-2-hydroxypropoxy) phenyl ] Dimethylmethane, bis- [p- (methacryloxyethoxy) phenyl] dimethylmethane, and the like.
- amide monomers of polyvalent amine compounds and unsaturated carboxylic acids include methylene bis-acrylamide, methylene bis-methacrylamide, 1,6-hexamethylene bis-acrylamide, 1,6-hexamethylene bis-methacrylic.
- examples include amide, diethylenetriamine trisacrylamide, xylylene bisacrylamide, and xylylene bismethacrylamide.
- urethane-based addition-polymerizable compounds produced by using an addition reaction of isocyanate and hydroxyl group are also suitable. Specific examples thereof include, for example, one molecule described in JP-B-48-41708.
- a vinyl urethane compound containing two or more polymerizable vinyl groups in one molecule obtained by adding a vinyl monomer containing a hydroxyl group represented by the following general formula (P) to a polyisocyanate compound having two or more isocyanate groups Etc.
- CH 2 C (R 104) COOCH 2 CH (R 105) OH (P) (However, R 104 and R 105 represent H or CH 3. )
- urethanes as described in JP-A-51-37193, JP-B-2-32293, JP-B-2-16765, JP-A-2003-344997, JP-A-2006-65210 are disclosed.
- Urethane compounds having the described hydrophilic group are also suitable.
- tris (acryloyloxyethyl) isocyanate is excellent in that it has a good balance of hydrophilicity involved in on-press developability and polymerization ability involved in printing durability.
- Isocyanuric acid ethylene oxide-modified acrylates such as nurate and bis (acryloyloxyethyl) hydroxyethyl isocyanurate are particularly preferred.
- the details of the method of use can be arbitrarily set according to the performance design of the final lithographic printing plate precursor.
- the polymerizable compound (C) is preferably used in the range of 5 to 75% by mass, more preferably 25 to 70% by mass, and particularly preferably 30 to 60% by mass with respect to the total solid content of the image recording layer. Is done.
- the (D) binder contained in the image recording layer of the lithographic printing plate precursor according to the invention can carry the image recording layer component on a support and can be removed by a developer. Used.
- (D) binder (meth) acrylic polymer, polyurethane resin, polyvinyl alcohol resin, polyvinyl butyral resin, polyvinyl formal resin, polyamide resin, polyester resin, epoxy resin and the like are used.
- (meth) acrylic polymers, polyurethane resins, and polyvinyl butyral resins are preferably used, and (meth) acrylic polymers, polyurethane resins, and polyvinyl butyral resins are more preferable.
- (meth) acrylic polymer means (meth) acrylic acid, (meth) acrylic acid ester (alkyl ester, aryl ester, allyl ester, etc.), (meth) acrylamide and (meth) acrylamide derivatives. It refers to a copolymer having a (meth) acrylic acid derivative such as “Polyurethane resin” refers to a polymer produced by a condensation reaction of a compound having two or more isocyanate groups and a compound having two or more hydroxyl groups.
- Polyvinyl butyral resin refers to a polymer synthesized by reacting polyvinyl alcohol and butyraldehyde obtained by saponifying polyvinyl acetate partly or entirely under acidic conditions (acetalization reaction).
- a polymer having an acid group or the like introduced by a method of reacting a compound having a remaining hydroxy group and an acid group or the like is also included.
- a suitable example of the (meth) acrylic polymer is a copolymer having a repeating unit containing an acid group.
- the acid group examples include a carboxylic acid group, a sulfonic acid group, a phosphonic acid group, a phosphoric acid group, and a sulfonamide group, and a carboxylic acid group is particularly preferable.
- a repeating unit containing an acid group a repeating unit derived from (meth) acrylic acid or one represented by the following general formula (I) is preferably used.
- R 211 represents a hydrogen atom or a methyl group
- R 212 represents a single bond or an n 211 +1 valent linking group
- a 211 represents an oxygen atom or —NR 213 —
- R 213 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms.
- n211 represents an integer of 1 to 5.
- the linking group represented by R 212 in the general formula (I) is composed of a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a sulfur atom and a halogen atom, and the number of atoms is preferably 1 to 80 It is.
- an alkylene group, a substituted alkylene group, an arylene group, a substituted arylene group, and the like can be mentioned.
- These divalent groups are linked in multiples by any of an amide bond, an ether bond, a urethane bond, a urea bond, and an ester bond. You may have the structure made.
- R 212 has a structure in which a single bond, an alkylene group, a substituted alkylene group, and an alkylene group and / or a substituted alkylene group are connected by a plurality of amide bonds, ether bonds, urethane bonds, urea bonds, or ester bonds.
- a single bond, an alkylene group having 1 to 5 carbon atoms, a substituted alkylene group having 1 to 5 carbon atoms and an alkylene group having 1 to 5 carbon atoms and / or a substituted alkylene group having 1 to 5 carbon atoms is an amide bond or an ether.
- a structure in which a plurality of bonds, urethane bonds, urea bonds, and ester bonds are connected is more preferable.
- An alkylene group of 1 to 3 and / or a substituted alkylene group of 1 to 3 carbon atoms is an amide bond, an ether bond, a urethane bond, a urea bond,
- a structure in which a plurality of ester bonds are linked by at least one of ester bonds is particularly preferable.
- Examples of the substituent that the linking group represented by R 212 may have include a monovalent nonmetallic atomic group excluding a hydrogen atom, and a halogen atom (—F, —Br, —Cl, -I), hydroxyl group, cyano group, alkoxy group, aryloxy group, mercapto group, alkylthio group, arylthio group, alkylcarbonyl group, arylcarbonyl group, carboxyl group and its conjugate base group, alkoxycarbonyl group, aryloxycarbonyl group, Examples thereof include a carbamoyl group, an aryl group, an alkenyl group, and an alkynyl group.
- R 213 is preferably a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, more preferably a hydrogen atom or a hydrocarbon group having 1 to 3 carbon atoms, and particularly preferably a hydrogen atom or a methyl group.
- n211 is preferably 1 to 3, more preferably 1 or 2, and particularly preferably 1.
- the proportion (mol%) of the polymerization component having a carboxylic acid group in the total polymerization component of the (meth) acrylic polymer is preferably 1 to 70% from the viewpoint of developability. In consideration of compatibility between developability and printing durability, 1 to 50% is more preferable, and 1 to 30% is particularly preferable.
- the (meth) acrylic polymer used in the present invention preferably further has a crosslinkable group.
- the crosslinkable group is a group that crosslinks the (D) binder in the course of radical polymerization reaction that occurs in the image recording layer when the lithographic printing plate precursor is exposed.
- an ethylenically unsaturated bond group, an amino group, an epoxy group etc. are mentioned as a functional group which can be addition-polymerized.
- the functional group which can become a radical by light irradiation may be sufficient, and as such a crosslinkable group, a thiol group, a halogen group, etc. are mentioned, for example.
- an ethylenically unsaturated bond group is preferred.
- a styryl group, a (meth) acryloyl group, and an allyl group are preferable.
- free radicals polymerization initiation radicals or growth radicals in the polymerization process of a polymerizable compound
- the polymer is directly or via a polymerization chain of the polymerizable compound.
- addition polymerization is performed, and a crosslink is formed between the polymer molecules to be cured.
- atoms in the polymer eg, hydrogen atoms on carbon atoms adjacent to the functional bridging group
- free radicals are abstracted by free radicals to form polymer radicals that are bonded to each other so that crosslinking between the polymer molecules occurs. Forms and cures.
- the content of the crosslinkable group in the (meth) acrylic polymer is preferably 0.01 to 10 per g of the (D) binder. It is 0 mmol, more preferably 0.05 to 9.0 mmol, particularly preferably 0.1 to 8.0 mmol.
- the (meth) acrylic polymer used in the present invention includes, in addition to the above-described polymer unit having an acid group and polymer unit having a crosslinkable group, a polymer unit of (meth) acrylic acid alkyl or aralkyl ester, (meth) acrylamide. Alternatively, it may have a polymer unit of a derivative thereof, a polymer unit of ⁇ -hydroxymethyl acrylate, and a polymer unit of a styrene derivative.
- the alkyl group of the (meth) acrylic acid alkyl ester is preferably an alkyl group having 1 to 5 carbon atoms and an alkyl group having the aforementioned substituent having 2 to 8 carbon atoms, and a methyl group is more preferable.
- Examples of the (meth) acrylic acid aralkyl ester include benzyl (meth) acrylate.
- (meth) acrylamide derivatives include N-isopropylacrylamide, N-phenylmethacrylamide, N- (4-methoxycarbonylphenyl) methacrylamide, N, N-dimethylacrylamide, morpholinoacrylamide and the like.
- Examples of ⁇ -hydroxymethyl acrylate include ethyl ⁇ -hydroxymethyl acrylate and cyclohexyl ⁇ -hydroxymethyl acrylate.
- Examples of the styrene derivative include styrene and 4-tertbutylstyrene.
- the (D) binder preferably has a hydrophilic group.
- the hydrophilic group contributes to imparting on-press developability to the image recording layer.
- the coexistence of the crosslinkable group and the hydrophilic group makes it possible to achieve both printing durability and on-press developability.
- hydrophilic group that the (D) binder may have include a hydroxy group, a carboxyl group, an alkylene oxide structure, an amino group, an ammonium group, an amide group, a sulfo group, and a phosphate group. Of these, an alkylene oxide structure having 1 to 9 alkylene oxide units having 2 or 3 carbon atoms is preferred.
- copolymerization of a monomer having a hydrophilic group is performed.
- Preferable examples of the polyurethane resin include paragraph numbers [00099] to [0210] of JP-A No. 2007-187836, paragraph numbers [0019] to [0100] of JP-A No. 2008-276155, and JP-A No. 2005-250438. And the polyurethane resins described in JP-A-2005-250158, paragraph numbers [0021] to [0083].
- polyvinyl butyral resin examples include polyvinyl butyral resins described in paragraph numbers [0006] to [0013] of JP-A-2001-75279.
- Part of the acid group in the (D) binder may be neutralized with a basic compound.
- basic compounds include compounds containing basic nitrogen, alkali metal hydroxides, and quaternary ammonium salts of alkali metals.
- the (D) binder preferably has a mass average molecular weight of 5000 or more, more preferably 10,000 to 300,000, more preferably a number average molecular weight of 1000 or more, and more preferably 2000 to 250,000.
- the polydispersity is preferably 1.1 to 10.
- the (D) binder may be used alone or in combination of two or more.
- the content of the binder (D) is preferably 5 to 75% by mass, and preferably 10 to 70% by mass, based on the total solid content of the image recording layer, from the viewpoint of good image area strength and image formability. More preferred is 10 to 60% by mass.
- the total content of the polymerizable compound (C) and the binder (D) is preferably 90% by mass or less based on the total solid content of the image recording layer. If it exceeds 90% by mass, the sensitivity and developability may be lowered. More preferably, it is 35 to 80% by mass.
- the image recording layer preferably contains (E) a dye. More preferably, the dye is a sensitizing dye.
- the sensitizing dye used in the image recording layer of the lithographic printing plate precursor according to the invention absorbs light at the time of image exposure and becomes excited, and supplies energy to the polymerization initiator by electron transfer, energy transfer, or heat generation. However, it can be used without particular limitation as long as it improves the polymerization initiation function.
- a sensitizing dye having a maximum absorption in a wavelength region of 300 to 450 nm or 750 to 1400 nm is preferably used.
- Examples of the sensitizing dye having the maximum absorption in the wavelength range of 350 to 450 nm include merocyanines, benzopyrans, coumarins, aromatic ketones, anthracenes, styryls, oxazoles and the like.
- a dye more preferable from the viewpoint of high sensitivity is a dye represented by the following general formula (IX).
- a 221 represents an aryl group or a heteroaryl group which may have a substituent
- X 221 represents an oxygen atom, a sulfur atom, or ⁇ N (R 223 ).
- R 221 , R 222 and R 223 each independently represent a monovalent non-metallic atomic group, and A 221 and R 221 or R 222 and R 223 are bonded to each other to form an aliphatic or aromatic group The ring may be formed.
- the monovalent nonmetallic atomic group represented by R 221 , R 222 or R 223 is preferably a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group.
- the aryl group and heteroaryl group which may have a substituent represented by A 221 are the substituted or unsubstituted aryl group and substituted or unsubstituted heteroaryl group described in R 221 , R 222 and R 223 , respectively. It is the same.
- sensitizing dyes include paragraph numbers [0047] to [0053] of JP-A No. 2007-58170, paragraph numbers [0036] to [0037] of JP-A No. 2007-93866, and JP-A No. 2007-.
- the compounds described in paragraph Nos. [0042] to [0047] of No. 72816 are preferably used.
- JP 2006-189604, JP 2007-171406, JP 2007-206216, JP 2007-206217, JP 2007-225701, JP 2007-225702, and JP 2007-316582 can also be preferably used.
- a sensitizing dye having a maximum absorption in the wavelength range of 750 to 1400 nm (hereinafter sometimes referred to as an infrared absorber) will be described.
- an infrared absorber a dye or a pigment is preferably used.
- dyes such as azo dyes, metal complex azo dyes, pyrazolone azo dyes, naphthoquinone dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, quinoneimine dyes, methine dyes, cyanine dyes, squarylium dyes, pyrylium salts, metal thiolate complexes Is mentioned.
- cyanine dyes particularly preferred among these dyes are cyanine dyes, squarylium dyes, pyrylium salts, nickel thiolate complexes, and indolenine cyanine dyes. Further, cyanine dyes and indolenine cyanine dyes are preferred, and particularly preferred examples include cyanine dyes represented by the following general formula (a).
- X 131 represents a hydrogen atom, a halogen atom, —NPh 2 , —X 132 -L 131 or a group shown below.
- Ph represents a phenyl group.
- X 132 represents an oxygen atom, a nitrogen atom or a sulfur atom
- L 131 represents a hydrocarbon group having 1 to 12 carbon atoms, an aryl group having a hetero atom (N, S, O, halogen atom, Se), A hydrocarbon group having 1 to 12 carbon atoms including a hetero atom is shown.
- X a - is Z a to be described later - which is synonymous with.
- R 141 represents a hydrogen atom or a substituent selected from an alkyl group, an aryl group, a substituted or unsubstituted amino group, and a halogen atom.
- R 131 and R 132 each independently represents a hydrocarbon group having 1 to 12 carbon atoms.
- R 131 and R 132 are preferably hydrocarbon groups having 2 or more carbon atoms.
- R 131 and R 132 may be connected to each other to form a ring. When forming a ring, it is particularly preferable to form a 5-membered ring or a 6-membered ring.
- Ar 131 and Ar 132 may be the same or different and each represents an aryl group which may have a substituent.
- Preferred aryl groups include a benzene ring group and a naphthalene ring group.
- a C12 or less hydrocarbon group, a halogen atom, and a C12 or less alkoxy group are mentioned.
- Y 131 and Y 132 may be the same or different and each represents a sulfur atom or a dialkylmethylene group having 12 or less carbon atoms.
- R 133 and R 134 may be the same or different, and each represents a hydrocarbon group having 20 or less carbon atoms, which may have a substituent.
- Preferred substituents include alkoxy groups having 12 or less carbon atoms, carboxyl groups, and sulfo groups.
- R 135 , R 136 , R 137 and R 138 may be the same or different and each represents 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 preferred.
- Z a - represents a counter anion. However, when the cyanine dye represented by the general formula (a) has an anionic substituent in its structure and neutralization of charge is not necessary, Z a - is not necessary.
- Preferred Z a ⁇ is a halide ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion and a sulfonate ion, particularly preferably a perchlorate ion, in view of the storage stability of the image recording layer coating solution.
- Hexafluorophosphate ions and aryl sulfonate ions are examples of the storage stability of the image recording layer coating solution.
- cyanine dye represented by the general formula (a) include compounds described in paragraphs [0017] to [0019] of JP-A No. 2001-133969, paragraph No. [0016] of JP-A No. 2002-023360.
- the compounds described in paragraphs [0035] to [0043] of JP-A-2007-90850 are particularly preferable.
- the infrared absorbing dye may be used alone or in combination of two or more, or an infrared absorbent other than the infrared absorbing dye such as a pigment may be used in combination.
- a pigment the compounds described in JP-A-2008-195018, paragraphs [0072] to [0076] are preferable.
- the content of the (E) dye is preferably 0.05 to 30 parts by mass, more preferably 0.1 to 20 parts by mass, particularly preferably 0. 2 to 10 parts by mass
- the image recording layer may contain a low molecular weight hydrophilic compound in order to improve the on-press developability without reducing the printing durability.
- a low molecular weight hydrophilic compound include water-soluble organic compounds such as glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, and ether or ester derivatives thereof, glycerin.
- Polyols such as pentaerythritol and tris (2-hydroxyethyl) isocyanurate, organic amines such as triethanolamine, diethanolamine and monoethanolamine and salts thereof, and organic such as alkylsulfonic acid, toluenesulfonic acid and benzenesulfonic acid Sulfonic acids and salts thereof, organic sulfamic acids and salts thereof such as alkylsulfamic acids, organic sulfuric acids and salts thereof such as alkylsulfuric acid and alkylethersulfuric acid, Organic phosphonic acids and their salts such as phosphate, tartaric acid, oxalic acid, citric acid, malic acid, lactic acid, gluconic acid, organic carboxylic acids and salts thereof such as amino acids, betaines, and the like.
- organic amines such as triethanolamine, diethanolamine and monoethanolamine and salts thereof
- organic such as alkylsulfonic acid,
- At least one selected from polyols, organic sulfates, organic sulfonates, and betaines it is preferable to contain at least one selected from polyols, organic sulfates, organic sulfonates, and betaines.
- organic sulfonate examples include alkyl sulfonic acids such as sodium n-butyl sulfonate, sodium n-hexyl sulfonate, sodium 2-ethylhexyl sulfonate, sodium cyclohexyl sulfonate, and sodium n-octyl sulfonate.
- alkyl sulfonic acids such as sodium n-butyl sulfonate, sodium n-hexyl sulfonate, sodium 2-ethylhexyl sulfonate, sodium cyclohexyl sulfonate, and sodium n-octyl sulfonate.
- organic sulfate examples include sulfate of alkyl, alkenyl, alkynyl, aryl or heterocyclic monoether of polyethylene oxide.
- the ethylene oxide unit is preferably 1 to 4, and the salt is preferably a sodium salt, potassium salt or lithium salt. Specific examples thereof include compounds described in paragraph numbers [0034] to [0038] of JP-A-2007-276454.
- the betaines are preferably compounds in which the hydrocarbon substituent on the nitrogen atom has 1 to 5 carbon atoms. Specific examples include trimethylammonium acetate, dimethylpropylammonium acetate, 3-hydroxy-4- Trimethylammoniobutylate, 4- (1-pyridinio) butyrate, 1-hydroxyethyl-1-imidazolioacetate, trimethylammonium methanesulfonate, dimethylpropylammonium methanesulfonate, 3-trimethylammonio-1-propanesulfonate , 3- (1-pyridinio) -1-propanesulfonate and the like.
- the dampening water penetrates into the exposed portion of the image recording layer (image portion) to improve the hydrophobicity and film strength of the image portion.
- the ink receptivity and printing durability of the image recording layer can be maintained well without being reduced.
- the content of the low molecular weight hydrophilic compound in the image recording layer is preferably 0.5 to 20% by mass, more preferably 1 to 15% by mass, based on the total solid content of the image recording layer. More preferred is mass%. In this range, good on-press developability and printing durability can be obtained.
- a low molecular weight hydrophilic compound may be used independently and may be used in mixture of 2 or more types.
- the image-recording layer may contain a oil-sensitizing agent such as a phosphonium compound, a nitrogen-containing low molecular weight compound, or an ammonium group-containing polymer in order to improve the inking property.
- a oil-sensitizing agent such as a phosphonium compound, a nitrogen-containing low molecular weight compound, or an ammonium group-containing polymer in order to improve the inking property.
- the sensitizer functions as a surface coating agent for the inorganic stratiform compound, and prevents a decrease in flaking during printing by the inorganic stratiform compound.
- nitrogen-containing low molecular weight compound examples include amine salts and quaternary ammonium salts. Also included are imidazolinium salts, benzoimidazolinium salts, pyridinium salts, and quinolinium salts. Of these, quaternary ammonium salts and pyridinium salts are preferred.
- tetramethylammonium hexafluorophosphate
- tetrabutylammonium hexafluorophosphate
- dodecyltrimethylammonium p-toluenesulfonate
- benzyltriethylammonium hexafluorophosphate
- benzyldimethyloctylammonium hexafluorophosphate.
- the ammonium group-containing polymer may be any polymer as long as it has an ammonium group in its structure, but a polymer containing 5 to 80 mol% of (meth) acrylate having an ammonium group in the side chain as a copolymerization component is preferable. . Specific examples include the polymers described in JP-A 2009-208458, paragraphs [0089] to [0105].
- the ammonium salt-containing polymer preferably has a reduced specific viscosity (unit: ml / g) determined by the following measurement method in the range of 5 to 120, more preferably in the range of 10 to 110, Those in the range of ⁇ 100 are particularly preferred.
- the reduced specific viscosity is converted into a mass average molecular weight, it is preferably 10,000 to 150,000, more preferably 17,000 to 140000, and particularly preferably 20,000 to 130,000.
- the content of the sensitizer is preferably 0.01 to 30.0% by mass, more preferably 0.1 to 15.0% by mass, and more preferably 1 to 5% by mass with respect to the total solid content of the image recording layer. Is more preferable.
- the image recording layer may contain a hydrophobized precursor.
- the hydrophobized precursor means fine particles capable of converting the image recording layer to hydrophobic when heat is applied.
- the fine particles are at least one selected from hydrophobic thermoplastic polymer fine particles, heat-reactive polymer fine particles, polymer fine particles having a polymerizable group, microcapsules enclosing a hydrophobic compound, and microgel (crosslinked polymer fine particles). It is preferable. Among these, polymer fine particles having a polymerizable group and microgel are preferable.
- hydrophobic thermoplastic polymer fine particles examples include Research Disclosure, No. 1, January 1992. 333003, hydrophobic thermoplastic polymers described in JP-A-9-123387, JP-A-9-131850, JP-A-9-171249, JP-A-9-171250, European Patent 931647, and the like A fine particle can be mentioned as a suitable thing.
- Specific examples of polymers constituting such polymer fine particles include ethylene, styrene, vinyl chloride, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, vinylidene chloride, acrylonitrile, vinyl carbazole, and polyalkylene structures.
- more preferable examples include a copolymer containing polystyrene, styrene and acrylonitrile, and polymethyl methacrylate.
- the average particle diameter of the hydrophobic thermoplastic polymer fine particles used in the present invention is preferably 0.01 to 2.0 ⁇ m.
- heat-reactive polymer fine particles used in the present invention include polymer fine particles having a heat-reactive group, and these form a hydrophobized region by crosslinking due to a heat reaction and a functional group change at that time.
- thermoreactive group in the polymer fine particles having a thermoreactive group used in the present invention may be any functional group that performs any reaction as long as a chemical bond is formed, but is preferably a polymerizable group, Examples include ethylenically unsaturated groups that undergo radical polymerization reactions (eg, acryloyl groups, methacryloyl groups, vinyl groups, allyl groups, etc.), cationic polymerizable groups (eg, vinyl groups, vinyloxy groups, epoxy groups, oxetanyl groups, etc.) ), An isocyanato group that performs an addition reaction or a block thereof, an epoxy group, a vinyloxy group, and a functional group having an active hydrogen atom that is a reaction partner thereof (for example, an amino group, a hydroxy group, a carboxy group, etc.), and a condensation reaction A carboxyl group and a reaction partner, a hydroxy group or an amino group, an acid anhydride that performs a ring-opening addition reaction,
- microcapsules used in the present invention for example, as described in JP-A Nos. 2001-277740 and 2001-277742, all or part of the constituent components of the image recording layer are encapsulated in the microcapsules. Is.
- the constituent components of the image recording layer can also be contained outside the microcapsules.
- the image recording layer containing microcapsules is preferably a mode in which hydrophobic constituent components are encapsulated in microcapsules and hydrophilic constituent components are contained outside the microcapsules.
- the microgel used in the present invention may contain a part of the constituent components of the image recording layer in at least one of the inside and the surface thereof.
- a reactive microgel is formed by having a radical polymerizable group on the surface thereof is particularly preferable from the viewpoint of image forming sensitivity and printing durability.
- a known method can be applied to microencapsulate or microgel the constituent components of the image recording layer.
- the average particle size of the microcapsule or microgel is preferably 0.01 to 3.0 ⁇ m, more preferably 0.05 to 2.0 ⁇ m, and particularly preferably 0.10 to 1.0 ⁇ m. Within this range, good resolution and stability over time can be obtained.
- the content of the hydrophobizing precursor is preferably 5 to 90% by mass based on the total solid content of the image recording layer.
- the image recording layer preferably contains a chain transfer agent.
- the chain transfer agent is defined, for example, in Polymer Dictionary 3rd Edition (edited by Polymer Society, 2005), pages 683-684.
- As the chain transfer agent for example, a compound group having SH, PH, SiH, GeH in the molecule is used. These can donate hydrogen to low-activity radical species to generate radicals, or can be oxidized and then deprotonated to generate radicals.
- thiol compounds for example, 2-mercaptobenzimidazoles, 2-mercaptobenzthiazoles, 2-mercaptobenzoxazoles, 3-mercaptotriazoles, 5-mercaptotetrazoles, etc.
- the content of the chain transfer agent is preferably 0.01 to 20 parts by mass, more preferably 1 to 10 parts by mass, and particularly preferably 1 to 5 parts by mass with respect to 100 parts by mass of the total solid content of the image recording layer. It is.
- the image recording layer may further contain various additives as necessary.
- Additives include surfactants for promoting developability and improving the surface of the coating, hydrophilic polymers for improving developability and dispersion stability of microcapsules, and visual and non-image areas visible A coloring agent and a print-out agent, a polymerization inhibitor for preventing unnecessary thermal polymerization of the polymerizable compound during production or storage of the image recording layer, and a higher fat derivative for preventing polymerization inhibition by oxygen Hydrophobic low molecular weight compounds such as inorganic fine particles for improving the strength of the cured film in the image area, organic fine particles, co-sensitizers for improving sensitivity, and plasticizers for improving plasticity.
- the image recording layer in the lithographic printing plate precursor according to the invention is not particularly limited in the formation method, and can be formed by a known method.
- the image recording layer is formed by preparing or applying a coating solution by dispersing or dissolving each of the necessary image recording layer components in a solvent.
- the solvent used include methyl ethyl ketone, ethylene glycol monomethyl ether, 1-methoxy-2-propanol, 2-methoxyethyl acetate, 1-methoxy-2-propyl acetate, and ⁇ -butyllactone. It is not limited.
- a solvent is used individually or in mixture.
- the solid content concentration of the coating solution is preferably 1 to 50% by mass.
- the coating amount (solid content) of the image recording layer is preferably 0.3 to 3.0 g / m 2 .
- Various methods can be used as the coating method. Examples thereof include bar coater coating, spin coating, spray coating, curtain coating, dip coating, air knife coating, blade coating, and roll coating.
- the (A) copolymer can be contained in the image recording layer or the undercoat layer by adding the (A) copolymer to the image recording layer coating solution or the undercoat layer coating solution.
- the content (solid content) of the (A) copolymer is preferably 0.1 to 100 mg / m 2 and 1 to 30 mg / m 2. Is more preferable, and 5 to 24 mg / m 2 is more preferable.
- the support used for the lithographic printing plate precursor according to the invention is not particularly limited as long as it is a dimensionally stable plate-like hydrophilic support.
- an aluminum plate is particularly preferable.
- surface treatment such as roughening treatment or anodizing treatment.
- the surface roughening treatment of the aluminum plate is carried out by various methods. For example, mechanical surface roughening treatment, electrochemical surface roughening treatment (surface roughening treatment to dissolve the surface electrochemically), chemical Surface roughening treatment (roughening treatment that selectively dissolves the surface chemically).
- the methods described in paragraphs [0241] to [0245] of JP-A-2007-206217 can be preferably used.
- the support preferably has a center line average roughness of 0.10 to 1.2 ⁇ m. Within this range, good adhesion to the image recording layer, good printing durability and good stain resistance can be obtained.
- the color density of the support is preferably 0.15 to 0.65 in terms of reflection density value. Within this range, good image formability by preventing halation during image exposure and good plate inspection after development can be obtained.
- the thickness of the support is preferably 0.1 to 0.6 mm, more preferably 0.15 to 0.4 mm, and still more preferably 0.2 to 0.3 mm.
- ⁇ Hydrophilic treatment> In the lithographic printing plate precursor according to the invention, it is also preferable to perform a hydrophilic treatment on the surface of the support in order to improve the hydrophilicity of the non-image area and prevent printing stains.
- a hydrophilic treatment of the support surface include alkali metal silicate treatment in which the support is immersed in an aqueous solution such as sodium silicate or electrolytic treatment, a method of treatment with potassium zirconate fluoride, a method of treatment with polyvinylphosphonic acid, and the like.
- the method of immersing in the polyvinylphosphonic acid aqueous solution is used preferably.
- a protective layer is preferably provided on the image recording layer in order to block diffusion and penetration of oxygen which hinders the polymerization reaction during exposure.
- a water-soluble polymer or a water-insoluble polymer can be appropriately selected and used, and two or more kinds can be mixed and used as necessary.
- Specific examples include polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble cellulose derivatives, poly (meth) acrylonitrile, and the like.
- using polyvinyl alcohol as a main component gives particularly good results in terms of basic characteristics such as oxygen barrier properties and development removability.
- the polyvinyl alcohol used in the protective layer may be partially substituted with an ester, ether or acetal as long as it contains an unsubstituted vinyl alcohol unit necessary for having the necessary oxygen barrier properties and water solubility. Similarly, some of them may have other copolymer components.
- Polyvinyl alcohol is obtained by hydrolyzing polyvinyl acetate. Specific examples of polyvinyl alcohol include those having a hydrolysis degree of 69.0 to 100 mol% and a number of polymerization repeating units in the range of 300 to 2400. Specifically, Kuraray Co., Ltd.
- Polyvinyl alcohol can be used alone or in combination.
- the content of polyvinyl alcohol in the protective layer is preferably 20 to 95% by mass, more preferably 30 to 90% by mass.
- modified polyvinyl alcohol can also be preferably used.
- acid-modified polyvinyl alcohol having a carboxylic acid group or a sulfonic acid group is preferably used.
- Specific examples include polyvinyl alcohols described in JP-A-2005-250216 and JP-A-2006-259137.
- the component to be mixed is preferably modified polyvinyl alcohol, polyvinyl pyrrolidone or a modified product thereof from the viewpoint of oxygen barrier properties, development removability, and the content in the protective layer. Is 3.5 to 80% by mass, preferably 10 to 60% by mass, and more preferably 15 to 30% by mass.
- flexibility can be imparted by adding glycerin, dipropylene glycol or the like in an amount corresponding to several mass% with respect to the polymer.
- anionic surfactants such as sodium alkyl sulfate and sodium alkyl sulfonate
- amphoteric surfactants such as alkylaminocarboxylate and alkylaminodicarboxylate
- nonionic surfactants such as polyoxyethylene alkylphenyl ether
- the protective layer preferably contains an inorganic layered compound for the purpose of improving oxygen barrier properties and image recording layer surface protection.
- inorganic layered compounds fluorine-based swellable synthetic mica, which is a synthetic inorganic layered compound, is particularly useful.
- inorganic layered compounds described in JP-A No. 2005-119273 are preferable.
- the coating amount of the protective layer is preferably 0.05 ⁇ 10g / m 2, when the protective layer contains the inorganic stratiform compound, if more preferably 0.1 ⁇ 5g / m 2, not containing an inorganic layered compound Is more preferably 0.5 to 5 g / m 2 .
- the lithographic printing plate precursor according to the invention can be provided with a backcoat layer on the back surface of the support, if necessary.
- a back coat layer for example, an organic polymer compound described in JP-A-5-45885, an organometallic compound or an inorganic metal compound described in JP-A-6-35174 is hydrolyzed and polymerized.
- Preferable examples include a coating layer made of a metal oxide obtained by condensation. Among them, it is inexpensive to use a silicon alkoxy compound such as Si (OCH 3 ) 4 , Si (OC 2 H 5 ) 4 , Si (OC 3 H 7 ) 4 , Si (OC 4 H 9 ) 4 or the like. It is preferable in terms of easy availability.
- a lithographic printing plate can be produced by subjecting the lithographic printing plate precursor of the present invention to image exposure and development.
- the method for producing a lithographic printing plate of the present invention comprises an exposure step of imagewise exposing the lithographic printing plate precursor of the present invention; and developing the exposed lithographic printing plate precursor with a developer having a pH of 2 to 14 A step of removing the non-exposed portion of the image recording layer and the protective layer simultaneously in the presence of the developer.
- the method for producing a lithographic printing plate of the present invention includes a step of forming a protective layer on the surface of the image recording layer opposite to the support; the developing step further includes a surfactant.
- the second method for producing a lithographic printing plate of the present invention includes a step of exposing the lithographic printing plate precursor according to the present invention imagewise, and a step of supplying the printing ink and fountain solution on the printing machine to remove the image recording layer in the non-exposed portion. It is characterized by that.
- the preferable aspect of each process is demonstrated in order about the manufacturing method of the lithographic printing plate of this invention.
- the lithographic printing plate precursor of the present invention can produce a lithographic printing plate even when the development step includes a water washing step.
- the method for producing a lithographic printing plate of the present invention includes an exposure step of imagewise exposing the lithographic printing plate precursor of the present invention.
- the lithographic printing plate precursor of the present invention is imagewise exposed by laser exposure through a transparent original image having a line image, a halftone dot image or the like, or by laser beam scanning by digital data.
- the wavelength of the light source is preferably 300 to 450 nm or 750 to 1400 nm.
- a lithographic printing plate precursor having a sensitizing dye having an absorption maximum in this wavelength region in the image recording layer is preferably used, and in the case of a light source of 750 to 1400 nm, absorption is performed in this wavelength region.
- a lithographic printing plate precursor containing an infrared absorbing agent, which is a sensitizing dye, in the image recording layer is preferably used.
- a semiconductor laser is suitable.
- a solid laser or semiconductor laser that emits infrared light is suitable.
- the output is preferably 100 mW or more, the exposure time per pixel is preferably within 20 microseconds, and the irradiation energy amount is preferably 10 to 300 mJ / cm 2 .
- the exposure mechanism may be any of an internal drum system, an external drum system, a flat bed system, and the like. Image exposure can be performed by a conventional method using a plate setter or the like. In the case of on-press development, the lithographic printing plate precursor may be mounted on a printing press and then image exposure may be performed on the printing press.
- the development process includes (1) a method of developing with a developer having a pH of 2 to 14 (developer processing method), or (2) a method of developing on a printing press while adding dampening water and / or ink ( (On-press development system).
- an image-exposed lithographic printing plate precursor is processed with a developer having a pH of 2 to 14, and an image recording layer in a non-exposed portion is removed to prepare a lithographic printing plate.
- a highly alkaline developer pH 12 or more
- the protective layer is removed by a pre-water washing step, then alkali development is performed, the alkali is washed away by water in the post-water washing step, gum solution treatment is performed, and drying is performed.
- a lithographic printing plate is produced by drying in the process.
- a developer having a pH of 2 to 14 is used.
- a surfactant or a water-soluble polymer compound is contained in the developer, whereby the development and the gum solution treatment can be performed simultaneously. Therefore, the post-water washing step is not particularly required, and the development-gum solution treatment can be performed with one solution. Furthermore, the pre-water washing step is not particularly required, and the protective layer can be removed simultaneously with the development-gum solution treatment.
- the method for producing a lithographic printing plate of the present invention it is preferable that after the development-gum treatment, for example, excess developer is removed using a squeeze roller and then dried.
- the developer treatment of the lithographic printing plate precursor according to the invention is carried out in accordance with a conventional method at a temperature of 0 to 60 ° C., preferably about 15 to 40 ° C., for example, by immersing the exposed lithographic printing plate precursor in a developer solution with a brush. It can be carried out by a method of rubbing with a brush, a method of spraying a developer by spraying and rubbing with a brush.
- the development processing with the developer can be preferably carried out by an automatic developing processor equipped with a developer supply means and a rubbing member.
- An automatic developing processor using a rotating brush roll as the rubbing member is particularly preferable.
- the automatic processor preferably includes a means for removing excess developer such as a squeeze roller and a drying means such as a warm air device after the development processing means.
- the automatic development processor may be provided with a preheating means for heat-treating the lithographic printing plate precursor after image exposure before the development processing means.
- the automatic development processor 100 shown in FIG. 2 includes a chamber having an outer shape formed by a machine frame 202, and is preheated continuously formed along the transport direction (arrow A) of the transport path 11 of the planographic printing plate precursor. It has a (preheat) unit 200, a developing unit 300, and a drying unit 400.
- the pre-heating unit 200 includes a heating chamber 208 having a carry-in port 212 and a carry-out port 218, and a skewer roller 210, a heater 214, and a circulation fan 216 are disposed therein.
- the developing unit 300 is separated from the preheating unit 200 by an outer panel 310, and the outer panel 310 is provided with a slit-shaped insertion port 312.
- a processing tank 306 having a developing tank 308 filled with a developer and an insertion roller pair 304 for guiding the planographic printing plate precursor into the processing tank 306 are provided inside the developing unit 300.
- the upper part of the developing tank 308 is covered with a shielding lid 324.
- a guide roller 344 and a guide member 342, a submerged roller pair 316, a brush roller pair 322, a brush roller pair 326, and a carry-out roller pair 318 are arranged in parallel from the upstream side in the transport direction.
- the lithographic printing plate precursor conveyed into the developing tank 308 is immersed in the developer and passes between the rotating brush roller pairs 322 and 326 to remove non-image portions.
- a spray pipe 330 is provided below the pair of brush rollers 322 and 326.
- the spray pipe 330 is connected to a pump (not shown), and the developer in the developing tank 308 sucked by the pump is ejected from the spray pipe 330 into the developing tank 308.
- An overflow port 51 formed at the upper end of the first circulation pipe C1 is provided on the side wall of the developing tank 308, and excess developer flows into the overflow port 51, and the first circulation pipe C1. And is discharged to an external tank 50 provided outside the developing unit 300.
- a second circulation pipe C2 is connected to the external tank 50, and a filter portion 54 and a developer supply pump 55 are provided in the second circulation pipe C2.
- the developer is supplied from the external tank 50 to the developer tank 308 by the developer supply pump 55.
- an upper limit liquid level meter 52 and a lower limit liquid level meter 53 are provided in the external tank 50.
- the developing tank 308 is connected to the replenishment water tank 71 via the third circulation pipe C3.
- a water replenishment pump 72 is provided in the third circulation pipe C 3, and water stored in the replenishment water tank 71 is supplied to the developing tank 308 by the water replenishment pump 72.
- a liquid temperature sensor 336 is installed upstream of the submerged roller pair 316, and a liquid level meter 338 is installed upstream of the carry-out roller pair 318.
- the partition plate 332 disposed between the developing unit 300 and the drying unit 400 is provided with a slit insertion port 334.
- a shutter (not shown) is provided in a path between the developing unit 300 and the drying unit 400, and when the planographic printing plate precursor 11 does not pass through the path, the path is closed by the shutter.
- the drying unit 400 includes a support roller 402, ducts 410 and 412, a transport roller pair 406, ducts 410 and 412, and a transport roller pair 408 in this order.
- a slit hole 414 is provided at the tip of the ducts 410 and 412.
- the drying unit 400 is provided with drying means such as hot air supply means and heat generation means (not shown).
- the drying unit 400 is provided with a discharge port 404, and the planographic printing plate dried by the drying unit is discharged from the discharge port 404.
- the developer used for the developer processing in the present invention contains an aqueous solution having a pH of 2 to 14, or a surfactant.
- the developer is preferably an aqueous solution containing water as a main component (containing 60% by mass or more of water), in particular, an aqueous solution containing a surfactant (anionic, nonionic, cationic, zwitterionic, etc.)
- An aqueous solution containing a water-soluble polymer compound is preferred.
- An aqueous solution containing both a surfactant and a water-soluble polymer compound is also preferred.
- the pH of the developer is more preferably from 3.5 to 13, further preferably from 6 to 13, and particularly preferably from 6.5 to 10.5.
- the anionic surfactant used in the developer in the present invention is not particularly limited, but fatty acid salts, abietic acid salts, hydroxyalkanesulfonic acid salts, alkanesulfonic acid salts, dialkylsulfosuccinic acid salts, linear alkylbenzenesulfonic acid Salts, branched alkylbenzene sulfonates, alkyl naphthalene sulfonates, alkyl diphenyl ether (di) sulfonates, alkylphenoxy polyoxyethylene alkyl sulfonates, polyoxyethylene alkyl sulfophenyl ether salts, N-alkyl-N-oleyl Sodium taurine, N-alkylsulfosuccinic acid monoamide disodium salt, petroleum sulfonates, sulfated castor oil, sulfated beef tallow oil, sulfate esters of fatty acid alky
- the cationic surfactant used in the developer is not particularly limited, and conventionally known cationic surfactants can be used. Examples thereof include alkylamine salts, quaternary ammonium salts, alkyl imidazolinium salts, polyoxyethylene alkylamine salts, and polyethylene polyamine derivatives.
- the nonionic surfactant used in the developer in the present invention is not particularly limited, but is a polyethylene glycol type higher alcohol ethylene oxide adduct, alkylphenol ethylene oxide adduct, alkyl naphthol ethylene oxide adduct, phenol ethylene oxide addition.
- Naphthol ethylene oxide adduct Naphthol ethylene oxide adduct, fatty acid ethylene oxide adduct, polyhydric alcohol fatty acid ester ethylene oxide adduct, higher alkylamine ethylene oxide adduct, fatty acid amide ethylene oxide adduct, fat ethylene oxide adduct, polypropylene glycol ethylene oxide Adduct, dimethylsiloxane-ethylene oxide block copolymer, dimethylsiloxane- (propylene oxide- Tylene oxide) block copolymer, fatty acid ester of polyhydric alcohol type glycerol, fatty acid ester of pentaerythritol, fatty acid ester of sorbitol and sorbitan, fatty acid ester of sucrose, alkyl ether of polyhydric alcohol, fatty acid amide of alkanolamines, etc.
- the zwitterionic surfactant used in the developer is not particularly limited, and examples thereof include amine oxides such as alkyldimethylamine oxide, betaines such as alkylbetaines, and amino acids such as alkylamino fatty acid sodium. It is done.
- alkyldimethylamine oxide which may have a substituent alkylcarboxybetaine which may have a substituent
- alkylsulfobetaine which may have a substituent are preferably used.
- a compound represented by the formula (2) in paragraph No. [0256] of JP-A-2008-203359, a formula (I), a formula (II) in paragraph No. [0028] of JP-A-2008-276166, A compound represented by the formula (VI) or a compound represented by paragraph numbers [0022] to [0029] of JP-A-2009-47927 can be used.
- the amount of the surfactant contained in the developer is preferably 0.01 to 20% by mass, more preferably 0.1 to 10% by mass.
- water-soluble polymer compound used in the developer in the present invention examples include soybean polysaccharide, modified starch, gum arabic, dextrin, fibrin derivatives (eg, carboxymethylcellulose, carboxyethylcellulose, methylcellulose, etc.) and modified products thereof, pullulan, Polyvinyl alcohol and its derivatives, polyvinyl pyrrolidone, polyacrylamide and acrylamide copolymer, vinyl methyl ether / maleic anhydride copolymer, vinyl acetate / maleic anhydride copolymer, styrene / maleic anhydride copolymer, polyvinyl sulfonic acid And salts thereof, polystyrenesulfonic acid and salts thereof, and the like.
- soybean polysaccharides known ones can be used.
- Soya Five manufactured by Fuji Oil Co., Ltd.
- various grades can be used.
- What can be preferably used is one in which the viscosity of a 10% by mass aqueous solution is in the range of 10 to 100 mPa / sec.
- modified starch known ones can be used.
- starch such as corn, potato, tapioca, rice and wheat is decomposed with acid or enzyme in the range of 5 to 30 glucose residues per molecule, and further alkali It can be made by a method of adding oxypropylene in the inside.
- the water-soluble polymer compound can be used in combination of two or more in the developer.
- the content of the water-soluble polymer compound in the developer is preferably from 0.1 to 20% by mass, and more preferably from 0.5 to 10% by mass.
- the developer used in the present invention can contain a pH buffer.
- the developing solution of the present invention can be used without particular limitation as long as it is a buffering agent that exhibits a buffering action at a pH of 2 to 14.
- weakly alkaline buffering agents are preferably used.
- (a) carbonate ions and hydrogen carbonate ions, (b) borate ions, (c) water-soluble amine compounds and ions of the amine compounds, and their Combination use etc. are mentioned. That is, for example, a combination of (a) carbonate ion-bicarbonate ion, (b) borate ion, or (c) water-soluble amine compound-ion of the amine compound exhibits pH buffering action in the developer.
- carbonate and bicarbonate may be added to the developer, 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. Alkali metals may be used alone or in combination of two or more.
- the total amount of carbonate ions and bicarbonate ions is preferably 0.05 to 5 mol / L, more preferably 0.07 to 2 mol / L, and particularly preferably 0.1 to 1 mol / L with respect to the developer.
- the developer may contain an organic solvent.
- organic solvent examples include aliphatic hydrocarbons (hexane, heptane, Isopar E, H, G (manufactured by Esso Chemical Co., Ltd.)), aromatic hydrocarbons (toluene, xylene, etc.), halogens, and the like. Hydrocarbons (methylene dichloride, ethylene dichloride, trichlene, monochlorobenzene, etc.) and polar solvents.
- Polar solvents include alcohols (methanol, ethanol, propanol, isopropanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, 1 -Nonanol, 1-decanol, benzyl alcohol, ethylene glycol monomethyl ether, 2-ethoxyethanol, diethylene glycol monoethyl ether, diethylene glycol monohexyl ether, triethylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monomethyl ether, polyethylene glycol monomethyl Ether, polypropylene glycol, tetraethylene glycol, ethylene glycol monobutyl ether Ter, ethylene glycol monobenzyl ether, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, methylphenyl carbinol,
- the organic solvent contained in the developer can be used in combination of two or more.
- the organic solvent When the 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 organic solvent is preferably less than 40% by mass from the viewpoint of safety and flammability.
- the developer may contain a preservative, a chelate compound, an antifoaming agent, an organic acid, an inorganic acid, an inorganic salt, and the like.
- a preservative e.g., a chelate compound, an antifoaming agent, an organic acid, an inorganic acid, an inorganic salt, and the like.
- compounds described in paragraph numbers [0266] to [0270] of JP-A-2007-206217 can be preferably used.
- the developer can be used as a developer and a development replenisher for the exposed lithographic printing plate precursor. Further, the present invention can be preferably applied to the automatic developing processor as described above. When developing using an automatic developing processor, the developing solution becomes fatigued according to the amount of processing, and therefore the replenishing solution or fresh developing solution may be used to restore the processing capability.
- an image-exposed lithographic printing plate precursor is supplied with oil-based ink and an aqueous component on a printing machine, and the image recording layer in the non-image area is removed to produce a lithographic printing plate.
- image exposure is performed on the printing machine.
- the uncured image recording layer is dissolved or dispersed in the non-image area by the supplied oil-based ink and / or the aqueous component in the initial stage of printing.
- the image recording layer cured by exposure forms an oil-based ink receiving portion having a lipophilic surface.
- Oil-based ink or water-based component may be first supplied to the plate surface, but oil-based ink is supplied first in order to prevent the water-based component from being contaminated by the removed image recording layer component. Is preferred.
- the lithographic printing plate precursor is subjected to on-press development on a printing machine and used as it is for printing a large number of sheets.
- the oil-based ink and the aqueous component ordinary lithographic printing ink and fountain solution are preferably used.
- the entire lithographic printing plate precursor is exposed before exposure, during exposure, and from exposure to development, regardless of the development method. You may heat. By such heating, an image forming reaction in the image recording layer is promoted, and advantages such as improvement in sensitivity and printing durability and stabilization of sensitivity may occur.
- it is also effective to perform whole surface post-heating or whole surface exposure on the image after the development processing for the purpose of improving the image strength and printing durability.
- heating before development is preferably performed under a mild condition of 150 ° C. or less. If the temperature is too high, problems such as curing of the non-image area may occur.
- Very strong conditions are used for heating after development. Usually, it is in the range of 100 to 500 ° C. If the temperature is low, sufficient image reinforcing action cannot be obtained. If the temperature is too high, problems such as deterioration of the support and thermal decomposition of the image area may occur.
- VA-046B (1.4 g) (manufactured by Wako Pure Chemical Industries, Ltd.) was added and heated at 80 ° C. for 3 hours. NaOH was added to the resulting polymer solution to adjust the pH to 9.7. Thereafter, 4-hydroxy-tetramethylpiperidinyloxy (4-OH-TEMPO) (0.2 g) (manufactured by Tokyo Chemical Industry) was added, heated to 55 ° C., itaconic anhydride (30.0 g) was added, The reaction was carried out at 55 ° C. for 6 hours. Then, ethyl acetate (500g) was added and liquid separation operation was performed, and the lower layer was collect
- planographic printing plate (1) Preparation of planographic printing plate precursor [Preparation of aluminum support 1] In order to remove rolling oil on the surface of an aluminum plate (material: JIS A1050) having a thickness of 0.3 mm, a degreasing treatment is performed at 50 ° C. for 30 seconds using a 10 mass% sodium aluminate aqueous solution, and then the hair diameter is 0.3 mm. The aluminum surface was grained using 3 bundle-planted nylon brushes and a pumice-water suspension (specific gravity 1.1 g / cm 3 ) having a median diameter of 25 ⁇ m and thoroughly washed with water.
- a degreasing treatment is performed at 50 ° C. for 30 seconds using a 10 mass% sodium aluminate aqueous solution, and then the hair diameter is 0.3 mm.
- the aluminum surface was grained using 3 bundle-planted nylon brushes and a pumice-water suspension (specific gravity 1.1 g / cm 3 ) having a median diameter of 25
- This plate was etched by being immersed in a 25 mass% sodium hydroxide aqueous solution at 45 ° C for 9 seconds, washed with water, further immersed in a 20 mass% nitric acid aqueous solution at 60 ° C for 20 seconds, and washed with water.
- the etching amount of the grained surface at this time was about 3 g / m 2 .
- an electrochemical roughening treatment was performed continuously using an alternating voltage of 60 Hz.
- the electrolytic solution at this time was a 1% by mass aqueous solution of nitric acid (containing 0.5% by mass of aluminum ions) and a liquid temperature of 50 ° C.
- the AC power supply waveform is electrochemical roughening treatment using a trapezoidal rectangular wave AC with a time TP of 0.8 msec until the current value reaches a peak from zero, a duty ratio of 1: 1, and a trapezoidal rectangular wave AC. Went. Ferrite was used for the auxiliary anode.
- the current density was 30 A / dm 2 at the peak current value, and 5% of the current flowing from the power source was shunted to the auxiliary anode.
- the amount of electricity in nitric acid electrolysis was 175 C / dm 2 when the aluminum plate was the anode. Then, water washing by spraying was performed.
- nitric acid electrolysis was performed with an aqueous solution of 0.5% by mass of hydrochloric acid (containing 0.5% by mass of aluminum ions) and an electrolytic solution having a liquid temperature of 50 ° C. and an aluminum plate serving as an anode with an electric quantity of 50 C / dm 2.
- an electrochemical surface roughening treatment was performed, followed by washing with water by spraying.
- the plate was provided with a DC anodized film of 2.5 g / m 2 at a current density of 15 A / dm 2 using a 15% by mass sulfuric acid aqueous solution (containing 0.5% by mass of aluminum ions) as an electrolyte, then washed with water and dried.
- An aluminum support 1 was prepared.
- the center line average roughness (Ra) of the support thus obtained was measured using a needle having a diameter of 2 ⁇ m and found to be 0.51 ⁇ m.
- the aluminum support 1 was treated with a 1% by mass aqueous solution of sodium silicate at 20 ° C. for 10 seconds to produce an aluminum support 2.
- the surface roughness was measured, it was 0.54 ⁇ m (Ra display according to JIS B0601).
- undercoat layer coating solution having the following composition was applied with a bar coater and dried at 100 ° C. for 1 minute to form an undercoat layer.
- the dry coating amount of the undercoat layer was 12 mg / m 2 .
- the image recording layer coating solution 1 having the following composition was bar coated and then oven dried at 90 ° C. for 60 seconds to form an image recording layer 1 having a dry coating amount of 1.3 g / m 2 .
- An image recording layer coating solution 3 having the following composition was bar coated and then oven dried at 100 ° C. for 60 seconds to form an image recording layer having a dry coating amount of 1.0 g / m 2 .
- the image recording layer coating solution 3 was prepared by mixing and stirring the following photosensitive solution (1) and hydrophobic precursor solution (1) immediately before coating.
- Binder polymer (3) Infrared absorber (1) Polymerization initiator (3) Sensitizer (1)
- a hydrophobized precursor aqueous dispersion (1) composed of polymer fine particles.
- the particle size distribution of the polymer fine particles had a maximum value at a particle size of 60 nm.
- the particle size distribution is obtained by taking an electron micrograph of polymer fine particles, measuring the total particle size of 5000 particles on the photograph, and dividing the obtained particle size measured value from 0 to 0 on a logarithmic scale by 50. Then, the frequency of appearance of each particle size was plotted and determined. For non-spherical particles, the particle size value of spherical particles having the same particle area as that on the photograph was used as the particle size.
- a protective layer coating solution 1 having the following composition was applied using a bar so that the dry coating amount was 0.75 g / m 2, and then dried at 125 ° C. for 70 seconds to form a protective layer.
- a protective layer coating solution 2 having the following composition was applied using a bar so that the dry coating amount was 0.75 g / m 2, and then dried at 125 ° C. for 70 seconds to form a protective layer.
- inorganic layered compound dispersion (1) Preparation of inorganic layered compound dispersion (1) 6.4 g of synthetic mica Somasif ME-100 (manufactured by Corp Chemical Co., Ltd.) was added to 193.6 g of ion-exchanged water, and the mixture was dispersed using a homogenizer until the average particle size (laser scattering method) was 3 ⁇ m. An inorganic layered compound dispersion (1) was prepared. The aspect ratio of the obtained dispersed particles was 100 or more.
- the lithographic printing plate precursors of Examples and Comparative Examples were prepared by combining the aluminum support, the undercoat layer, the image recording layer, and the protective layer as shown in the following table.
- the polymer used for the comparative example is as follows.
- the automatic processor has one brush roll with an outer diameter of 50 mm in which fibers made of polybutylene terephthalate (hair diameter 200 ⁇ m, hair length 17 mm) are implanted, and rotates 200 times per minute in the same direction as the conveying direction ( The peripheral speed of the brush tip was 0.52 m / sec).
- the temperature of the developer was 30 ° C.
- the planographic printing plate precursor was transported at a transport speed of 100 cm / min. After the development processing, drying was performed in a drying section. The drying temperature was 80 ° C. However, when the developer 2 was used, it was washed with water before the post-development drying step.
- New Coal B13 manufactured by Nippon Emulsifier Co., Ltd.
- gum arabic has a mass average molecular weight of 200,000.
- Nonionic surfactant 1.0g (Emalex 710, manufactured by Nippon Emulsion Co., Ltd.) ⁇ Phenoxypropanol 1.0g ⁇ Octanol 0.6g ⁇ N- (2-hydroxyethyl) morpholine 1.0 g ⁇ Triethanolamine 0.5g ⁇ Sodium gluconate 1.0g ⁇ Trisodium citrate 0.5g ⁇ Ethylenediaminetetraacetate tetrasodium 0.05g ⁇ Polystyrenesulfonic acid 1.0g (Versa TL77 (30% solution), manufactured by Alco Chemical) (Add phosphoric acid and adjust pH to 7.0)
- Nonionic surfactant (W-3)
- Nonionic surfactant (W-4)
- Relative printing durability (printing durability of the target lithographic printing plate precursor) / (printing durability of the standard lithographic printing plate precursor)
- ⁇ Stain resistance> The printed material on the 20th sheet was taken out after the start of printing, and the stain resistance was evaluated based on the ink density adhered to the non-image area. Ink adhesion in the non-image area does not necessarily occur uniformly, and thus is indicated by a visual evaluation score per 75 cm 2 .
- the score of the visual evaluation is 10 points when the ink adhesion area ratio of the non-image area is 0%, 9 points exceeding 0% and 9 points or less, 8 points exceeding 20% and 10 points exceeding 20%, and 30 points exceeding 30%.
- Comparative Examples 1, 2, 7, and 10 of the polymer consisting only of repeating units having a functional group that interacts with the support surface are printing durability, stain resistance, and stain resistance after aging. It turned out to be inferior. It was found that Comparative Examples 4, 8, and 11 having no ethylenically unsaturated group in the side chain of the repeating unit are inferior in the balance of stain resistance, stain resistance after aging and developability. Although it has an ethylenically unsaturated bond in the side chain of the repeating unit, it was found that Comparative Examples 5, 9, and 12 that do not satisfy the repeating unit represented by the general formula (1) are inferior in stain resistance and developability. On the other hand, Examples 1 to 59 having repeating units satisfying the requirements of the present invention were found to be excellent in stain resistance, stain resistance after aging and developability without impairing printing durability.
- Each lithographic printing plate precursor shown in the table below is 50% flat under the conditions of output 9 W, outer drum rotational speed 210 rpm, resolution 2, 400 dpi using a Trendsetter 3244VX (equipped with water-cooled 40 W infrared semiconductor laser (830 nm)) manufactured by Creo. A net image exposure was performed.
- the developing solution 1 or 4 in the automatic developing processor having the structure shown in FIG. 1, the heater setting at which the plate surface arrival temperature in the preheating part becomes 100 ° C., the immersion time (development time) in the developing solution is Development processing was performed at a conveyance speed of 20 seconds.
- Each lithographic printing plate precursor was evaluated in the same manner as in Example 1 for printing durability, stain resistance, stain resistance after aging, and developability. Evaluation of printing durability and developability was based on Comparative Example 13 for Examples 60 to 66 and Comparative Examples 13 and 14, and Comparative Example 15 for Examples 67 to 73 and Comparative Examples 15 and 16 (1. 0).
- Comparative Examples 13 and 15 of the polymer consisting only of repeating units having a functional group that interacts with the surface of the support have excellent printing durability, stain resistance, and stain resistance after aging. You can see that it is inferior. Although it has an ethylenically unsaturated bond in the side chain of a repeating unit, it turned out that Comparative Examples 14 and 16 which do not contain the repeating unit represented by General formula (1) are inferior in stain resistance and developability. On the other hand, Examples 60 to 73 having repeating units satisfying the requirements of the present invention were found to be excellent in stain resistance, stain resistance after aging and developability without impairing printing durability.
- Each lithographic printing plate precursor shown in the following table was exposed using a Luxel PLASETTER T-6000III manufactured by FUJIFILM Corporation equipped with an infrared semiconductor laser under the conditions of an outer drum rotation speed of 1000 rpm, a laser output of 70%, and a resolution of 2400 dpi.
- the exposure image includes a solid image and a 50% dot chart of a 20 ⁇ m dot FM screen.
- the exposed lithographic printing plate precursor was mounted on the plate cylinder of a printing machine LITHRONE 26 manufactured by Komori Corporation without developing.
- Print durability After the on-press development property was evaluated, printing was further continued. As the number of printed sheets increased, the image recording layer gradually worn out, so that the ink density on the printed material decreased.
- Comparative Example 17 of the polymer consisting only of a repeating unit having a functional group that interacts with the support surface is the printing durability, stain resistance, It turned out that it is inferior to stain resistance later. Although it has an ethylenically unsaturated bond in the side chain of the repeating unit, it can be seen that Comparative Example 18 having no repeating unit represented by the general formula (1) is inferior in stain resistance and on-press developability.
- Examples 74 to 80 having repeating units satisfying the requirements of the present invention were found to be excellent in stain resistance, stain resistance after aging and developability without impairing printing durability.
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Abstract
Description
特に近年は、地球環境への配慮が産業界全体の大きな関心事となっており、環境への配慮からも、より中性域に近い現像液での処理や廃液の低減が課題として挙げられている。特に湿式の後処理は、簡素化するか、乾式処理に変更することが望ましい。
このような平版印刷版原版として、特許文献1および特許文献2が知られている。
一方、本願発明者が特許文献2について検討を行ったところ、特許文献2に記載の構造を持つバインダーを用いた場合、耐汚れ性や現像性が不十分であること分かった。
すなわち、従来のPS版では、このような耐汚れ性(特に、経時後の耐汚れ性)の要求を満たしながら高い耐刷性および現像性を実現することは実質的に不可能であった。
本願発明はかかる従来技術の問題点を解決するものであって、耐刷性、耐汚れ性、および現像性に優れた平版印刷版原版および平板印刷版の製造方法を提供することを目的とする。
一般式(1)
<2>前記重合体(A)が、一般式(2)で表される繰り返し単位および/または一般式(3)で表される繰り返し単位を含む、<1>に記載の平版印刷版原版。
一般式(2)
一般式(3)
<3>前記重合体(A)が、一般式(3)で表される繰り返し単位、一般式(4)で表される繰り返し単位および一般式(5)で表される繰り返し単位の少なくとも1種を含む、<1>に記載の平版印刷版原版。
一般式(3)
一般式(4)
一般式(5)
<4>前記重合体(A)が、さらに、(a2)支持体表面と相互作用する構造を側鎖に有する繰り返し単位および/または(a3)親水性基を側鎖に有する繰り返し単位を含むことを特徴とする、<1>~<3>いずれか1項記載の平版印刷版原版。
<5>前記(a2)支持体表面と相互作用する構造を側鎖に有する繰り返し単位が、下記一般式(a2-1)~(a2-6)で表される構造のいずれか1種以上を側鎖に有する、<4>に記載の平版印刷版原版。
<6>前記(a3)親水性基を側鎖に有する繰り返し単位が、下記一般式(a3-1)および/または(a3-2)で表される構造のいずれかを側鎖に有する、<4>または<5>に記載の平版印刷版原版。
<7>前記重合体(A)が、下記(a2)および(a3)を含有することを特徴とする共重合体である、<1>に記載の平版印刷版原版。
(a2)一般式(a2-1)~(a2-6)で表される構造のいずれか1種以上を側鎖に有する繰り返し単位
(a3)一般式(a3-1)および/または(a3-2)で表される構造を側鎖に有する繰り返し単位
<8>前記一般式(2)におけるL1、一般式(3)におけるL101、一般式(4)におけるL11、一般式(5)におけるL21が、2価の脂肪族基であり、前記一般式(2)におけるL2、一般式(3)におけるL102、一般式(4)におけるL12、一般式(5)におけるL22が、単結合または2価の脂肪族基である、<2>~<7>のいずれか1項に記載の平版印刷版原版。
<9>画像記録層が、(B)重合開始剤、(C)重合性化合物および(D)バインダーを含む、<1>~<8>のいずれか1項に記載の平版印刷版原版。
<10>画像記録層が、pHが2~14の水溶液により除去可能である、<1>~<9>のいずれか1項に記載の平版印刷版原版。
<11>画像記録層が、印刷インキおよび湿し水の少なくとも一方により除去可能である、<1>~<10>のいずれか1項に記載の平版印刷版原版。
<12><1>~<11>のいずれか1項に記載の平版印刷版原版を、画像様に露光する工程と、露光した前記平版印刷版原版を、pHが2~14の現像液の存在下で、非露光部の画像記録層を除去する工程とを含むことを特徴とする平版印刷版の製造方法。
<13>画像記録層の前記支持体とは反対側の表面上に、保護層を形成する工程を含み;
現像工程において、さらに界面活性剤を含有する前記現像液の存在下、非露光部の画像記録層と前記保護層とを同時に除去する工程を含む(但し、水洗工程を含まない)、ことを特徴とする<12>に記載の平版印刷版の製造方法。
<14><1>~<11>のいずれかに記載の平版印刷版原版を、画像様に露光する工程と、
印刷機上で印刷インキと湿し水を供給して非露光部の前記画像記録層を除去する工程とを含むことを特徴とする平版印刷版の製造方法。
<15> 下記(a1)~(a3)を含有することを特徴とする共重合体。
(a1)一般式(1)で表される繰り返し単位
一般式(1)
(a2)一般式(a2-1)~(a2-6)で表される構造のいずれか1種以上を側鎖に有する繰り返し単位
(a3)一般式(a3-1)および/または(a3-2)で表される構造を側鎖に有する繰り返し単位
<16>一般式(1)で表される繰り返し単位が一般式(4)で表される繰り返し単位または一般式(5)で表される繰り返し単位である、<15>に記載の共重合体。
一般式(4)
一般式(5)
本明細書中、一般式で表される化合物における基の表記に関して、置換あるいは無置換を記していない場合、当該基が更に置換基を有することが可能な場合には、他に特に規定がない限り、無置換の基のみならず置換基を有する基も包含する。例えば、一般式において、「Rはアルキル基、アリール基または複素環基を表す」との記載があれば、「Rは無置換アルキル基、置換アルキル基、無置換アリール基、置換アリール基、無置換複素環基または置換複素環基を表す」ことを意味する。
本発明の平版印刷版原版は、支持体上に、下塗り層と、画像記録層とを該順に有し、前記下塗り層が、一般式(1)で表される繰り返し単位を含む重合体(A)を含むことを特徴とする。
重合体(A)は、一般式(1)で表される繰り返し単位を含み、他の繰り返し単位を含んでいてもよく、(a2)支持体表面と相互作用する構造を側鎖に有する繰り返し単位および/または(a3)親水性基を側鎖に有する繰り返し単位を含むことが好ましい。
一般式(1)
一般式(1)で表される繰り返し単位は、-NH-C(=O)-構造を持つことが好ましく、1つの繰り返し単位中に2つ以上の-NH-C(=O)-構造を持つことがより好ましい。また、Lは、アミド結合を含む2価の連結基であることが好ましい。
一般式(2)
一般式(2)で表される繰り返し単位は、アミド結合を1つ以上有することが好ましく、2つ有することがより好ましい。
X1は、-N(R7)-が好ましい。R7は、水素原子が好ましい。
ここで2価の脂肪族基とは、アルキレン基、置換アルキレン基、アルケニレン基、置換アルケニレン基、アルキニレン基、置換アルキニレン基またはポリアルキレンオキシ基を意味する。なかでもアルキレン基、置換アルキレン基、アルケニレン基、置換アルケニレン基、およびポリアルキレンオキシ基が好ましく、アルキレン基、置換アルキレン基およびポリアルキレンオキシ基がさらに好ましい。2価の脂肪族基は、環状構造よりも鎖状構造の方が好ましく、さらに分岐を有する鎖状構造よりも直鎖状構造の方が好ましい。2価の脂肪族基の炭素原子数は、1~20であることが好ましく、1~15であることがより好ましく、1~12であることがさらに好ましく、1~10であることがよりさらに好ましく、1~8であることがよりさらに好ましく、1~4であることが特に好ましい。
2価の脂肪族基の置換基の例としては、ハロゲン原子(F、Cl、Br、I)、ヒドロキシ基、カルボキシ基、アミノ基、シアノ基、アリール基、アルコキシ基、アリールオキシ基、モノアルキルアミノ基、ジアルキルアミノ基、アリールアミノ基およびジアリールアミノ基等が挙げられる。
2価の芳香族基の例としては、フェニレン基、置換フェニレン基、ナフタレン基および置換ナフタレン基が挙げられ、フェニレン基が好ましい。2価の芳香族基の置換基の例としては、上記2価の脂肪族基の置換基の例に加えて、アルキル基が挙げられる。
2価の脂肪族基は、環状構造よりも鎖状構造の方が好ましく、さらに分岐を有する鎖状構造よりも直鎖状構造の方が好ましい。2価の脂肪族基の炭素原子数は、1~20であることが好ましく、1~15であることがより好ましく、1~12であることがさらに好ましく、1~10であることがよりさらに好ましく、1~8であることがよりさらに好ましく、1~4であることが特に好ましい。2価の脂肪族基の置換基の例としては、ハロゲン原子(F、Cl、Br、I)、ヒドロキシ基、カルボキシ基、アミノ基、シアノ基、アリール基、アルコキシ基、アリールオキシ基、モノアルキルアミノ基、ジアルキルアミノ基、アリールアミノ基およびジアリールアミノ基等が挙げられる。
2価の芳香族基の例としては、フェニレン基、置換フェニレン基、ナフタレン基および置換ナフタレン基が挙げられ、フェニレン基が好ましい。
2価の芳香族基の置換基の例としては、上記2価の脂肪族基の置換基の例に加えて、アルキル基が挙げられる。
L2、R4、R5およびR6のいずれか2つ以上が互いに結合して環を形成してもよい。2つの基が結合して1つの環を形成していてもよいし、3つ以上の基が結合して縮合環を形成していてもよい。さらに、2つの基が結合して形成した環が2つあってもよい。好ましくは、2つの基が結合して1つの環を形成している場合である。
一般式(3)で表される繰り返し単位は、アミド結合を1つ以上有することが好ましく、2つ有することがより好ましい。
Y101は、-CO-N(R107)-が好ましい。R107およびR103は、好ましくは水素原子を表す。
L101は、一般式(2)におけるL1と同義であり、好ましい範囲も同義である。
L102は、一般式(2)におけるL2と同義であり、好ましい範囲も同義である。
R104~R106は、一般式(2)におけるR4と同義であり、好ましい範囲も同義である。
L102、R104、R105およびR106のいずれか2つ以上が互いに結合して環を形成してもよい。2つの基が結合して1つの環を形成していてもよいし、3つ以上の基が結合して縮合環を形成していてもよい。さらに、2つの基が結合して形成した環が2つあってもよい。好ましくは、2つの基が結合して1つの環を形成している場合である。
一般式(4)
一般式(4)で表される繰り返し単位は、アミド結合を1つ以上有することが好ましく、2つ有することがより好ましい。
X11は、-N(R16)-が好ましい。R16は、水素原子が好ましい。
L11は、一般式(2)におけるL1と同義で有り、好ましい範囲も同義である。
L12は、一般式(2)におけるL2と同義で有り、好ましい範囲も同義である。
R14およびR15は、一般式(2)におけるR4と同義であり、好ましい範囲も同義である。
L12、R14およびR15のいずれか2つ以上が互いに結合して環を形成してもよい。2つの基が結合して1つの環を形成していてもよいし、3つ以上の基が結合して縮合環を形成していてもよい。さらに、2つの基が結合して形成した環が2つあってもよい。好ましくは、2つの基が結合して1つの環を形成している場合である。
Mは水素原子または1価の金属イオンまたはアンモニウムを表す。1価の金属イオンとしては、リチウムイオン、ナトリウムイオン、カリウムイオン等が挙げられるが、Mとしては水素原子、ナトリウムイオンまたはカリウムイオンが好ましく、水素原子またはナトリウムイオンがより好ましい。
一般式(5)で表される繰り返し単位は、アミド結合を1つ以上有することが好ましく、2つ有することがより好ましい。
X21は、-N(R26)-が好ましい。R26は、水素原子が好ましい。
L21は、一般式(2)におけるL1と同義で有り、好ましい範囲も同義である。
L22は、一般式(2)におけるL2と同義で有り、好ましい範囲も同義である。
R24およびR25、それぞれ、一般式(2)におけるR4と同義であり、好ましい範囲も同義である。
L22、R24およびR25のいずれか2つ以上が互いに結合して環を形成してもよい。2つの基が結合して1つの環を形成していてもよいし、3つ以上の基が結合して縮合環を形成していてもよい。さらに、2つの基が結合して形成した環が2つあってもよい。好ましくは、2つの基が結合して1つの環を形成している場合である。
Mは水素原子または1価の金属イオンまたはアンモニウムを表す。1価の金属イオンとしては、リチウムイオン、ナトリウムイオン、カリウムイオン等が挙げられるが、Mとしては水素原子、ナトリウムイオンまたはカリウムイオンが好ましく、水素原子またはナトリウムイオンがより好ましい。
本発明で用いる重合体(A)は、支持体表面と相互作用する構造を側鎖に有する繰り返し単位
支持体との密着性を高めるために、支持体表面と相互作用する構造を側鎖に有する繰り返し単位を含むことが好ましく、下記一般式(a2-1)~(a2-6)で表される構造のいずれか1種以上を側鎖に有する繰り返し単位を含むことがより好ましい。
(a2)下記一般式(a2-1)、(a2-2)、(a2-3)、(a2-4)、(a2-5)および(a2-6)で表される支持体表面と相互作用する構造のいずれかを側鎖に有する繰り返し単位を含有することが好ましい。
R21~R23は、水素原子またはメチル基が好ましい。
-L1-:-CO-O-2価の脂肪族基-
-L2-:-CO-O-2価の芳香族基-
-L3-:-CO-NH-2価の脂肪族基-
-L4-:-CO-NH-2価の芳香族基-
2価の脂肪族基は、環状構造よりも鎖状構造の方が好ましく、さらに分岐を有する鎖状構造よりも直鎖状構造の方が好ましい。2価の脂肪族基の炭素原子数は、1~20であることが好ましく、1~15であることがより好ましく、1~12であることがさらに好ましく、1~10であることがよりさらに好ましく、1~8であることが特に好ましく、1~4であることが最も好ましい。
2価の脂肪族基の置換基の例としては、ハロゲン原子(F、Cl、Br、I)、ヒドロキシ基、カルボキシ基、アミノ基、シアノ基、アリール基、アルコキシ基、アリールオキシ基、アシル基、アシルオキシ基、モノアルキルアミノ基、ジアルキルアミノ基、アリールアミノ基およびジアリールアミノ基等が挙げられる。
2価の芳香族基の置換基の例としては、上記2価の脂肪族基の置換基の例に加えて、アルキル基が挙げられる。
M21およびM22は、水素原子であることが好ましい。
具体的には、下記の構造を挙げることができる。本発明では下記構造に限定されるものではないことは言うまでもない。
(a2)は一般式(a2-1)~(a2-6)で表される構造を表し、一般式(a2-1)~(a2-6)中の*で表される部位で炭素原子に連結する。
本発明で用いる重合体(A)は、非画像部の支持体表面を高親水性にするために、(a3)として親水性基を少なくとも1つ側鎖に含有する繰り返し単位を有しても良い。親水性基としては水分子との間に水素結合・ファンデルワールス結合・イオン結合を形成しやすいものを指し、具体的にはヒドロキシ基、カルボキシル基、アミノ基、スルホ基、正電荷または負電荷を有する基、双性イオン基やその金属塩等が挙げられる。またこれら親水基は(a2)支持体表面と相互作用する構造を側鎖に有する繰り返し単位と兼ねても良い。
R31およびR32の炭素数は、後述の有していてもよい置換基の炭素数を含めて、炭素数1~30が好ましく、炭素数1~20がより好ましく、炭素数1~15がさらに好ましく、炭素数1~8がよりさらに好ましく、炭素数1~4が特に好ましい。
R31およびR32で表されるアルケニル基の例としては、ビニル基、アリル基、プレニル基、ゲラニル基、オレイル基等が挙げられる。
R31およびR32で表されるアルキニル基の例としては、エチニル基、プロパルギル基、トリメチルシリルエチニル基等が挙げられる。
R31およびR32で表されるアリール基の例としては、フェニル基、1-ナフチル基、2-ナフチル基などが挙げられる。さらに、ヘテロ環基としては、フラニル基、チオフェニル基、ピリジニル基などが挙げられる。
-L1-:-CO-O-2価の脂肪族基-
-L2-:-CO-O-2価の芳香族基-
-L3-:-CO-NH-2価の脂肪族基-
-L4-:-CO-NH-2価の芳香族基-
2価の脂肪族基は、環状構造よりも鎖状構造の方が好ましく、さらに分岐を有する鎖状構造よりも直鎖状構造の方が好ましい。2価の脂肪族基の炭素原子数は、1~20であることが好ましく、1~15であることがより好ましく、1~12であることがさらに好ましく、1~10であることがよりさらに好ましく、1~8であることが特に好ましく、1~4であることが最も好ましい。
2価の脂肪族基の置換基の例としては、ハロゲン原子(F、Cl、Br、I)、ヒドロキシ基、カルボキシ基、アミノ基、シアノ基、アリール基、アルコキシ基、アリールオキシ基、アシル基、アシルオキシ基、モノアルキルアミノ基、ジアルキルアミノ基、アリールアミノ基およびジアリールアミノ基等が挙げられる。
2価の芳香族基の置換基の例としては、上記2価の脂肪族基の置換基の例に加えて、アルキル基が挙げられる。
L31の具体例として、例えば、以下の連結基が挙げられる。
置換基の例としては、ハロゲン原子(F、Cl、Br、I)、ヒドロキシ基、カルボキシ基、アミノ基、シアノ基、アリール基、アルコキシ基、アリールオキシ基、アシル基、アルコキシカルボニル基、アリールオキシカルボニル基、アシルオキシ基、モノアルキルアミノ基、ジアルキルアミノ基、モノアリールアミノ基およびジアリールアミノ基等が挙げられる。
具体的には、以下の陰イオンが挙げられる。
さらにY3は-L3-であり、R31およびR32が、それぞれ、メチル基であり、L31が、炭素数4の直鎖アルキレン基であり、かつA-がスルホナートの組み合わせがより好ましい。
具体的には下記構造式が好ましい。
L32は連結基を表し、好ましくは、-CO-、-O-、-NH-、2価の脂肪族基、2価の芳香族基およびそれらの組み合わせからなる連結基である。また、L32は、後述の有してもよい置換基の炭素数を含めて、炭素数30以下であることが好ましい。置換基の具体例としては、アルキレン基(好ましくは炭素数1~20のアルキレン基、より好ましくは炭素数1~10のアルキレン基、さらに好ましくは炭素数2~6のアルキレン基)、および、フェニレン基、キシリレン基などのアリレン基(好ましくは炭素数5~15のアリレン基、より好ましくは炭素数6~10のアリレン基)が挙げられる。耐汚れ性の観点から、L32は、炭素数1~5の直鎖アルキレン基が好ましく、炭素数1~3の直鎖アルキレン基がより好ましい。
L32の具体例として、例えば、以下の連結基が挙げられる。
置換基の例としては、ハロゲン原子(F、Cl、Br、I)、ヒドロキシ基、カルボキシ基、アミノ基、シアノ基、アリール基、アルコキシ基、アリールオキシ基、アシル基、アルコキシカルボニル基、アリールオキシカルボニル基、アシルオキシ基、モノアルキルアミノ基、ジアルキルアミノ基、モノアリールアミノ基およびジアリールアミノ基等が挙げられる。
E+は、カチオンを有する構造を表し、好ましくはアンモニウム、ホスホニウム、ヨードニウム、またはスルホニウムを有する構造を表す。より好ましくは、アンモニウムまたはホスホニウムを有する構造であり、特に好ましくはアンモニウムを有する構造である。カチオンを有する構造の例としては、トリメチルアンモニオ基、トリエチルアンモニオ基、トリブチルアンモニオ基、ベンジルジメチルアンモニオ基、ジエチルヘキシルアンモニオ基、(2-ヒドロキシエチル)ジメチルアンモニオ基、ピリジニオ基、N-メチルイミダゾリオ基、N-アクリジニオ基、トリメチルホスホニオ基、トリエチルホスホニオ基、トリフェニルホスホニオ基などが挙げられる。
L32、Y4、E+のさらに好ましい組み合わせは、L32が炭素数2~4のアルキレン基であり、Y4は、-L1-または-L3-であり、E+は、トリメチルアンモニオ基またはトリエチルアンモニオ基である。
具体的には、下記の構造をあげることができる。
一般式(a3-3)
このような繰り返し単位を有する重合体(A)を、機上現像型の平版印刷版原版の下塗り層に用いることで、良好な機上現像性を達成することができる。側鎖にアルキルエーテル鎖を有する繰り返し単位は、重合体(A)の0~20mol%の範囲で含まれることが好ましい。
量%の範囲で含まれることが好ましい。
重合体(A)は、既知の方法によっても合成可能であるが、その合成には、ラジカル重合法、且つそれに続く、ポリマー側鎖のアミノ基と、ラジカル重合反応性基を有するイソシアネート類を用いたウレア化反応、が好ましく用いられる。
また、本発明の平版印刷版原版は、前記画像記録層の前記支持体とは反対側の表面上に、保護層を含むことが好ましい。
また、本発明の平版印刷版原版は、必要に応じて、支持体の裏面にバックコート層を設けることができる。
本発明の平版印刷版原版の下塗り層は重合体(A)を含有する。
下塗り層は、水又はメタノール、エタノール、メチルエチルケトンなどの有機溶剤若しくはそれらの混合溶剤に上記化合物を溶解させた溶液を支持体上に塗布、乾燥する方法、又は、水、あるいは、メタノール、エタノール、メチルエチルケトンなどの有機溶剤若しくはそれらの混合溶剤に上記化合物を溶解させた溶液に、支持体を浸漬して上記化合物を吸着させ、しかる後、水などによって洗浄、乾燥する方法によって設けることができる。前者の方法では、上記化合物の濃度0.005~10質量%の溶液を種々の方法で塗布できる。
例えば、バーコーター塗布、回転塗布、スプレー塗布、カーテン塗布などいずれの方法を用いてもよい。また、後者の方法では、溶液の濃度は0.01~20質量%、好ましくは0.05~5質量%であり、浸漬温度は20~90℃、好ましくは25~50℃であり、浸漬時間は0.1秒~20分、好ましくは2秒~1分である。
前記下塗り層の塗布量(固形分)は、0.1~100mg/m2であるのが好ましく、1~30mg/m2であるのがより好ましい。固形分の90質量%以上が重合体(A)であることが好ましい。
本発明の平版印刷版原版の前記画像記録層は、(B)重合開始剤、(C)重合性化合物および(D)バインダーを含むことが好ましく、(B)重合開始剤、(C)重合性化合物、(D)バインダーおよび(E)色素を含有することがさらに好ましい。
本発明の画像記録層は重合開始剤(以下、開始剤化合物とも称する)を含有することが好ましい。本発明においては、ラジカル重合開始剤が好ましく用いられる。
オニウム塩は、750~1400nmの波長域に極大吸収を有する赤外線吸収剤と併用して用いられることが特に好ましい。
前記画像記録層中の重合開始剤の含有量は、前記画像記録層全固形分に対し、好ましくは0.01~20質量%、より好ましくは0.1~15質量%、さらに好ましくは1.0~10質量%である。
前記画像記録層に用いる重合性化合物は、少なくとも1個のエチレン性不飽和二重結合を有する付加重合性化合物であり、末端エチレン性不飽和結合を少なくとも1個、好ましくは2個以上有する化合物から選ばれる。これらは、例えばモノマー、プレポリマー、すなわち2量体、3量体およびオリゴマー、またはそれらの混合物などの化学的形態をもつ。モノマーの例としては、不飽和カルボン酸(例えば、アクリル酸、メタクリル酸、イタコン酸、クロトン酸、イソクロトン酸、マレイン酸など)や、そのエステル類、アミド類が挙げられ、好ましくは、不飽和カルボン酸と多価アルコール化合物とのエステル類、不飽和カルボン酸と多価アミン化合物とのアミド類が用いられる。また、ヒドロキシル基、アミノ基、メルカプト基等の求核性置換基を有する不飽和カルボン酸エステル類或いはアミド類と単官能もしくは多官能イソシアネート類或いはエポキシ類との付加反応物、および単官能もしくは多官能のカルボン酸との脱水縮合反応物等も好適に使用される。また、イソシアネート基、エポキシ基等の親電子性置換基を有する不飽和カルボン酸エステル類或いはアミド類と単官能もしくは多官能のアルコール類、アミン類、チオール類との付加反応物、更にハロゲン基、トシルオキシ基等の脱離性置換基を有する不飽和カルボン酸エステル類或いはアミド類と単官能もしくは多官能のアルコール類、アミン類、チオール類との置換反応物も好適である。また、上記の不飽和カルボン酸を、不飽和ホスホン酸、スチレン、ビニルエーテル等に置き換えた化合物群を使用することも可能である。これらは、特表2006-508380号公報、特開2002-287344号公報、特開2008-256850号公報、特開2001-342222号公報、特開平9-179296号公報、特開平9-179297号公報、特開平9-179298号公報、特開2004-294935号公報、特開2006-243493号公報、特開2002-275129号公報、特開2003-64130号公報、特開2003-280187号公報、特開平10-333321号公報等に記載されている。
(ただし、R104およびR105は、HまたはCH3を示す。)
本発明の平版印刷版原版の前記画像記録層に含有される(D)バインダーは、前記画像記録層成分を支持体上に担持可能であり、現像液により除去可能であるものが用いられる。前記(D)バインダーとしては、(メタ)アクリル系重合体、ポリウレタン樹脂、ポリビニルアルコール樹脂、ポリビニルブチラール樹脂、ポリビニルホルマール樹脂、ポリアミド樹脂、ポリエステル樹脂、エポキシ樹脂などが用いられる。特に、(メタ)アクリル系重合体、ポリウレタン樹脂、ポリビニルブチラール樹脂が好ましく用いられ、より好ましくは(メタ)アクリル系重合体、ポリウレタン樹脂、ポリビニルブチラール樹脂である。
前記(メタ)アクリル系重合体の好適な一例としては、酸基を含有する繰り返し単位を有する共重合体が挙げられる。酸基としては、カルボン酸基、スルホン酸基、ホスホン酸基、リン酸基、スルホンアミド基等が挙げられるが、特にカルボン酸基が好ましい。酸基を含有する繰り返し単位としては、(メタ)アクリル酸由来の繰り返し単位や下記一般式(I)で表されるものが好ましく用いられる。
前記R212で表される連結基が有していてもよい置換基としては、水素原子を除く1価の非金属原子団を挙げることができ、ハロゲン原子(-F、-Br、-Cl、-I)、ヒドロキシル基、シアノ基、アルコキシ基、アリーロキシ基、メルカプト基、アルキルチオ基、アリールチオ基、アルキルカルボニル基、アリールカルボニル基、カルボキシル基及びその共役塩基基、アルコキシカルボニル基、アリーロキシカルボニル基、カルバモイル基、アリール基、アルケニル基、アルキニル基等が挙げられる。
n211は1~3であることが好ましく、1又は2であることがより好ましく、1であることが特に好ましい。
本発明に用いられる(メタ)アクリル系重合体はさらに架橋性基を有することが好ましい。ここで架橋性基とは、平版印刷版原版を露光した際に画像記録層中で起こるラジカル重合反応の過程で前記(D)バインダーを架橋させる基のことである。このような機能の基であれば特に限定されないが、例えば、付加重合反応し得る官能基としてエチレン性不飽和結合基、アミノ基、エポキシ基等が挙げられる。また光照射によりラジカルになり得る官能基であってもよく、そのような架橋性基としては、例えば、チオール基、ハロゲン基等が挙げられる。なかでも、エチレン性不飽和結合基が好ましい。エチレン性不飽和結合基としては、スチリル基、(メタ)アクリロイル基、アリル基が好ましい。
前記(D)バインダー中の酸基の一部が、塩基性化合物で中和されていてもよい。塩基性化合物としては、塩基性窒素を含有する化合物やアルカリ金属水酸化物、アルカリ金属の4級アンモニウム塩などが挙げられる。
前記(D)バインダーは単独で用いても2種以上を混合して用いてもよい。
前記(D)バインダーの含有量は、良好な画像部の強度と画像形成性の観点から、前記画像記録層の全固形分に対して、5~75質量%が好ましく、10~70質量%がより好ましく、10~60質量%が更に好ましい。
また、前記(C)重合性化合物および前記(D)バインダーの合計含有量は、前記画像記録層の全固形分に対して、90質量%以下が好ましい。90質量%を超えると、感度の低下、現像性の低下を引き起こす場合がある。より好ましくは35~80質量%である。
前記画像記録層は、(E)色素を含むことが好ましい。前記色素は、増感色素であることがより好ましい。
本発明の平版印刷版原版の前記画像記録層に用いられる増感色素は、画像露光時の光を吸収して励起状態となり、前記重合開始剤に電子移動、エネルギー移動又は発熱などでエネルギーを供与し、重合開始機能を向上させるものであれば特に限定せず用いることができる。特に、300~450nm又は750~1400nmの波長域に極大吸収を有する増感色素が好ましく用いられる。
これらの染料のうち特に好ましいものとしては、シアニン色素、スクアリリウム色素、ピリリウム塩、ニッケルチオレート錯体、インドレニンシアニン色素が挙げられる。更に、シアニン色素やインドレニンシアニン色素が好ましく、特に好ましい例として下記一般式(a)で示されるシアニン色素が挙げられる。
前記画像記録層は、耐刷性を低下させることなく機上現像性を向上させるために、低分子親水性化合物を含有してもよい。
前記低分子親水性化合物としては、例えば、水溶性有機化合物としては、エチレングリコール、ジエチレングリコール、トリエチレングリコール、プロピレングリコール、ジプロピレングリコール、トリプロピレングリコール等のグリコール類及びそのエーテルまたはエステル誘導体類、グリセリン、ペンタエリスリトール、トリス(2-ヒドロキシエチル)イソシアヌレート等のポリオール類、トリエタノールアミン、ジエタノールアミン、モノエタノールアミン等の有機アミン類及びその塩、アルキルスルホン酸、トルエンスルホン酸、ベンゼンスルホン酸等の有機スルホン酸類及びその塩、アルキルスルファミン酸等の有機スルファミン酸類及びその塩、アルキル硫酸、アルキルエーテル硫酸等の有機硫酸類及びその塩、フェニルホスホン酸等の有機ホスホン酸類及びその塩、酒石酸、シュウ酸、クエン酸、リンゴ酸、乳酸、グルコン酸、アミノ酸類等の有機カルボン酸類及びその塩、ベタイン類等が挙げられる。
前記画像記録層には、着肉性を向上させるために、ホスホニウム化合物、含窒素低分子化合物、アンモニウム基含有ポリマーなどの感脂化剤を含有させることができる。特に、保護層が無機質の層状化合物を含有する場合、感脂化剤は、無機質の層状化合物の表面被覆剤として機能し、無機質の層状化合物による印刷途中の着肉性低下を防止する。
30%ポリマー溶液3.33g(固形分として1g)を、20mlのメスフラスコに秤量し、N-メチルピロリドンでメスアップする。この溶液を30℃の恒温槽で30分間静置し、ウベローデ還元粘度管(粘度計定数=0.010cSt/s)に入れて30℃にて流れ落ちる時間を測定する。なお測定は同一サンプルで2回測定し、その平均値を算出する。同様にブランク(N-メチルピロリドンのみ)の場合も測定し、下記式から還元比粘度(ml/g)を算出する。
(1)2-(トリメチルアンモニオ)エチルメタクリレート=p-トルエンスルホナート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比10/90 質量平均分子量4.5万)
(2)2-(トリメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比20/80 質量平均分子量6.0万)
(3)2-(エチルジメチルアンモニオ)エチルメタクリレート=p-トルエンスルホナート/ヘキシルメタクリレート共重合体(モル比30/70 質量平均分子量4.5万)
(4)2-(トリメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/2-エチルヘキシルメタクリレート共重合体(モル比20/80 質量平均分子量6.0万)
(5)2-(トリメチルアンモニオ)エチルメタクリレート=メチルスルファート/ヘキシルメタクリレート共重合体(モル比40/60 質量平均分子量7.0万)
(6)2-(ブチルジメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比 25/75 質量平均分子量6.5万)
(7)2-(ブチルジメチルアンモニオ)エチルアクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比20/80 質量平均分子量6.5万)
(8)2-(ブチルジメチルアンモニオ)エチルメタクリレート=13-エチル-5,8,11-トリオキサ-1-ヘプタデカンスルホナート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比20/80 質量平均分子量7.5万)
(9)2-(ブチルジメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート/2-ヒドロキシ-3-メタクロイルオキシプロピルメタクリレート共重合体(モル比15/80/5 質量平均分子量6.5万)
前記画像記録層には、機上現像性を向上させるため、疎水化前駆体を含有させることができる。疎水化前駆体とは、熱が加えられたときに前記画像記録層を疎水性に変換できる微粒子を意味する。微粒子としては、疎水性熱可塑性ポリマー微粒子、熱反応性ポリマー微粒子、重合性基を有するポリマー微粒子、疎水性化合物を内包しているマイクロカプセル及びミクロゲル(架橋ポリマー微粒子)から選ばれる少なくとも1つであることが好ましい。なかでも、重合性基を有するポリマー微粒子及びミクロゲルが好ましい。
このようなポリマー微粒子を構成するポリマーの具体例としては、エチレン、スチレン、塩化ビニル、アクリル酸メチル、アクリル酸エチル、メタクリル酸メチル、メタクリル酸エチル、塩化ビニリデン、アクリロニトリル、ビニルカルバゾール、ポリアルキレン構造を有するアクリレートまたはメタクリレートなどのモノマーのホモポリマーもしくはコポリマーまたはそれらの混合物を挙げることができる。その中で、より好適なものとして、ポリスチレン、スチレンおよびアクリロニトリルを含む共重合体、ポリメタクリル酸メチルを挙げることができる。
前記画像記録層は、連鎖移動剤を含有することが好ましい。連鎖移動剤は、例えば高分子辞典第三版(高分子学会編、2005年)683-684頁に定義されている。連鎖移動剤としては、例えば、分子内にSH、PH、SiH、GeHを有する化合物群が用いられる。これらは、低活性のラジカル種に水素供与して、ラジカルを生成するか、もしくは、酸化された後、脱プロトンすることによりラジカルを生成しうる。前記画像記録層には、特に、チオール化合物(例えば、2-メルカプトベンズイミダゾール類、2-メルカプトベンズチアゾール類、2-メルカプトベンズオキサゾール類、3-メルカプトトリアゾール類、5-メルカプトテトラゾール類等)を好ましく用いることができる。
本発明の平版印刷版原版における前記画像記録層は、形成方法に特に制限はなく、公知の方法で形成されることができる。前記画像記録層は、必要な上記各画像記録層成分を溶剤に分散または溶解して塗布液を調製し、塗布して形成される。使用する溶剤としては、メチルエチルケトン、エチレングリコールモノメチルエーテル、1-メトキシ-2-プロパノール、2-メトキシエチルアセテート、1-メトキシ-2-プロピルアセテート、γ-ブチルラクトン等を挙げることができるが、これに限定されるものではない。溶剤は、単独または混合して使用される。塗布液の固形分濃度は、好ましくは1~50質量%である。
前記(A)共重合体を画像記録層又は下塗り層に含有させるには、前記(A)共重合体を画像記録層用塗布液又は下塗り層用塗布液に添加することにより行うことができる。前記(A)共重合体が前記画像記録層に含まれる場合、前記(A)共重合体の含有量(固形分)は、0.1~100mg/m2が好ましく、1~30mg/m2がより好ましく、5~24mg/m2がさらに好ましい。
本発明の平版印刷版原版に用いられる支持体は、特に限定されず、寸度的に安定な板状の親水性支持体であればよい。支持体としては、特に、アルミニウム板が好ましい。アルミニウム板を使用するに先立ち、粗面化処理、陽極酸化処理等の表面処理を施すことが好ましい。アルミニウム板表面の粗面化処理は、種々の方法により行われるが、例えば、機械的粗面化処理、電気化学的粗面化処理( 電気化学的に表面を溶解させる粗面化処理) 、化学的粗面化処理( 化学的に表面を選択溶解させる粗面化処理) が挙げられる。これらの処理については、特開2007-206217号の段落番号〔0241〕~〔0245〕に記載された方法を好ましく用いることができる。
前記支持体は、中心線平均粗さが0.10~1.2μmであることが好ましい。この範囲で、前記画像記録層との良好な密着性、良好な耐刷性と良好な汚れ難さが得られる。
また、前記支持体の色濃度は、反射濃度値で0.15~0.65が好ましい。この範囲で、画像露光時のハレーション防止による良好な画像形成性と現像後の良好な検版性が得られる。
前記支持体の厚さは0.1~0.6mmであるのが好ましく、0.15~0.4mmであるのがより好ましく、0.2~0.3mmであるのが更に好ましい。
本発明の平版印刷版原版においては、非画像部領域の親水性を向上させ印刷汚れを防止するために、支持体表面の親水化処理を行うことも好適である。
支持体表面の親水化処理としては、支持体をケイ酸ナトリウム等の水溶液に浸漬処理又は電解処理するアルカリ金属シリケート処理、フッ化ジルコン酸カリウムで処理する方法、ポリビニルホスホン酸で処理する方法等が挙げられるが、ポリビニルホスホン酸水溶液に浸漬処理する方法が好ましく用いられる。
本発明の平版印刷版原版には、露光時の重合反応を妨害する酸素の拡散侵入を遮断するため、前記画像記録層上に保護層(酸素遮断層)を設けることが好ましい。前記保護層の材料としては、水溶性ポリマー、水不溶性ポリマーのいずれをも適宜選択して使用することができ、必要に応じて2種類以上を混合して使用することもできる。具体的には、例えば、ポリビニルアルコール、変性ポリビニルアルコール、ポリビニルピロリドン、水溶性セルロース誘導体、ポリ(メタ)アクリロニトリル等が挙げられる。これらの中で、比較的結晶性に優れた水溶性高分子化合物を用いることが好ましい。具体的には、ポリビニルアルコールを主成分として用いることが、酸素遮断性、現像除去性といった基本特性的に特に良好な結果を与える。
本発明の平版印刷版原版は、必要に応じて、前記支持体の裏面にバックコート層を設けることができる。前記バックコート層としては、例えば、特開平5-45885号公報に記載されている有機高分子化合物、特開平6-35174号公報に記載されている有機金属化合物または無機金属化合物を加水分解および重縮合させて得られる金属酸化物からなる被覆層が好適に挙げられる。中でも、Si(OCH3)4 、Si(OC2H5)4 、Si(OC3H7)4 、Si(OC4H9)4等のケイ素のアルコキシ化合物を用いることが、原料が安価で入手しやすい点で好ましい。
本発明の平版印刷版原版を画像露光して現像処理を行うことで平版印刷版を製造することができる。
本発明の平版印刷版の製造方法は、本発明の平版印刷版原版を、画像様に露光する露光工程と;露光した前記平版印刷版原版を、pHが2~14の現像液で現像する現像工程を含み;前記現像工程において、前記現像液の存在下、前記画像記録層の非露光部と前記保護層とを同時に除去する工程を含むことを特徴とする。
本発明の平版印刷版の製造方法は、前記画像記録層の前記支持体とは反対側の表面上に、保護層を形成する工程を含み;前記現像工程において、さらに界面活性剤を含有する前記現像液の存在下、非露光部の画像記録層と前記保護層とを同時に除去する工程を含む(但し、水洗工程を含まない)、ことが好ましい
本発明の平版印刷版の製造方法の第二の態様は、本発明の平版印刷版原版を、画像様に露光する工程と、印刷機上で印刷インキと湿し水を供給して非露光部の前記画像記録層を除去する工程とを含むことを特徴とする。
以下、本発明の平版印刷版の製造方法について、各工程の好ましい態様を順に説明する。なお、本発明の平版印刷版の製造方法によれば、本発明の平版印刷版原版は前記現像工程において水洗工程を含む場合も平板印刷版を製造することができる。
本発明の平版印刷版の製造方法は、本発明の平版印刷版原版を、画像様に露光する露光工程を含む。本発明の平版印刷版原版は、線画像、網点画像等を有する透明原画を通してレーザー露光するかデジタルデータによるレーザー光走査等で画像様に露光される。
光源の波長は300~450nm又は750~1400nmが好ましく用いられる。300~450nmの光源の場合は、この波長領域に吸収極大を有する増感色素を画像記録層に有する平版印刷版原版が好ましく用いられ、750~1400nmの光源の場合は、この波長領域に吸収を有する増感色素である赤外線吸収剤を画像記録層に含有する平版印刷版原版が好ましく用いられる。300~450nmの光源としては、半導体レーザーが好適である。750~1400nmの光源としては、赤外線を放射する固体レーザー及び半導体レーザーが好適である。赤外線レーザーに関しては、出力は100mW以上であることが好ましく、1画素当たりの露光時間は20マイクロ秒以内であるのが好ましく、また照射エネルギー量は10~300mJ/cm2であるのが好ましい。また、露光時間を短縮するためマルチビームレーザーデバイスを用いることが好ましい。露光機構は、内面ドラム方式、外面ドラム方式、フラットベッド方式等の何れでもよい。
画像露光は、プレートセッターなどを用いて常法により行うことができる。機上現像の場合には、平版印刷版原版を印刷機に装着した後、印刷機上で画像露光を行ってもよい。
現像処理は、(1)pHが2~14の現像液にて現像する方法(現像液処理方式)、又は(2)印刷機上で、湿し水及び/又はインキを加えながら現像する方法(機上現像方式)で行うことができる。
現像液処理方式においては、画像露光された平版印刷版原版は、pHが2~14の現像液により処理され、非露光部の画像記録層が除去されて平版印刷版が作製される。
高アルカリ性現像液(pH12以上)を用いる現像処理においては、通常、前水洗工程により保護層を除去し、次いでアルカリ現像を行い、後水洗工程でアルカリを水洗除去し、ガム液処理を行い、乾燥工程で乾燥して平版印刷版が作製される。
本発明の第一の好ましい態様によれば、pHが2~14の現像液が使用される。この態様においては、現像液中に界面活性剤又は水溶性高分子化合物を含有させることが好ましく、これにより現像とガム液処理を同時に行うことが可能となる。よって後水洗工程は特に必要とせず、1液で現像-ガム液処理を行うことができる。
さらに、前水洗工程も特に必要とせず、保護層の除去も現像-ガム液処理と同時に行うことができる。本発明の平板印刷版の製造方法では、現像-ガム処理の後に、例えば、スクイズローラーを用いて余剰の現像液を除去した後、乾燥を行うことが好ましい。
図2に示す自動現像処理機100は、機枠202により外形が形成されたチャンバーからなり、平版印刷版原版の搬送路11の搬送方向(矢印A)に沿って連続して形成された前加熱(プレヒート)部200、現像部300及び乾燥部400を有している。
前加熱部200は、搬入口212及び搬出口218を有する加熱室208を有し、その内部には串型ローラー210とヒーター214と循環ファン216とが配置されている。
現像部300の内部には、現像液で満たされている現像槽308を有する処理タンク306と、平版印刷版原版を処理タンク306内部へ案内する挿入ローラー対304が設けられている。現像槽308の上部は遮蔽蓋324で覆われている。
ブラシローラー対322、326の下部には、スプレーパイプ330が設けられている。スプレーパイプ330はポンプ(不図示)が接続されており、ポンプによって吸引された現像槽308内の現像液がスプレーパイプ330から現像槽308内へ噴出するようになっている。
外部タンク50は第2の循環用配管C2が接続され、第2の循環用配管C2中には、フィルター部54及び現像液供給ポンプ55が設けられている。現像液供給ポンプ55によって、現像液が外部タンク50から現像槽308へ供給される。また、外部タンク50内には上限液レベル計52、下限液レベル計53が設けられている。
現像槽308は、第3の循環用配管C3を介して補充用水タンク71に接続されている。第3の循環用配管C3中には水補充ポンプ72が設けられており、この水補充ポンプ72によって補充用水タンク71中に貯留される水が現像槽308へ供給される。
液中ローラー対316の上流側には液温センサ336が設置されており、搬出ローラー対318の上流側には液面レベル計338が設置されている。
乾燥部400は、支持ローラー402、ダクト410、412、搬送ローラー対406、ダクト410、412、搬送ローラー対408がこの順に設けられている。ダクト410、412の先端にはスリット孔414が設けられている。また、乾燥部400には図示しない温風供給手段、発熱手段等の乾燥手段が設けられている。乾燥部400には排出口404が設けられ、乾燥手段により乾燥された平版印刷版は排出口404から排出される。
機上現像方式においては、画像露光された平版印刷版原版は、印刷機上で油性インキと水性成分とを供給し、非画像部の画像記録層が除去されて平版印刷版が作製される。
すなわち、平版印刷版原版を画像露光後、なんらの現像処理を施すことなくそのまま印刷機に装着するか、あるいは、平版印刷版原版を印刷機に装着した後、印刷機上で画像露光し、ついで、油性インキと水性成分とを供給して印刷すると、印刷途上の初期の段階で、非画像部においては、供給された油性インキ及び/または水性成分によって、未硬化の画像記録層が溶解または分散して除去され、その部分に親水性の表面が露出する。一方、露光部においては、露光により硬化した画像記録層が、親油性表面を有する油性インキ受容部を形成する。最初に版面に供給されるのは、油性インキでもよく、水性成分でもよいが、水性成分が除去された画像記録層成分によって汚染されることを防止する点で、最初に油性インキを供給することが好ましい。このようにして、平版印刷版原版は印刷機上で機上現像され、そのまま多数枚の印刷に用いられる。油性インキ及び水性成分としては、通常の平版印刷用の印刷インキと湿し水が好適に用いられる。
<重合体P-5~P-13の合成>
500mlの三口フラスコに、ビニルホスホン酸(15.8g)、[3-(メタクリロイルアミノ)プロピル]ジメチル-(3-スルホプロピル)アンモニウムベタイン内塩(17.9g)、2-メタクリルアミドエチルアミン(11.3g)、蒸留水(240g)を加え窒素気流下、10分間55℃で加熱攪拌した。その後、VA-046B(1.4g)(和光純薬製)を蒸留水(40g)に溶解し、3時間かけて滴下した。その後、VA-046B(1.4g)(和光純薬製)を加え80℃で3時間加熱し、加熱終了後冷却した。得られたポリマー溶液に対してNaOHを添加しpHを9.7に調整した。その後、4-ヒドロキシ-テトラメチル ピペリジニルオキシ(4-OH-TEMPO)(0.2g)(東京化成製)を加え、55℃に加熱し、イタコン酸無水物(30.0g)を加え、55℃で6時間反応させた。その後、酢酸エチル(500g)を加えて分液操作を行い、下層を回収した。回収した下層にイオン交換樹脂としてAmberlyst 15(15g)(Ardrich)を加えろ過することで重合体P-5の水溶液を得た。
また、イタコン酸無水物に替えて、シトラコン酸無水物、マレイン酸無水物、2,3-ジメチルマレイン酸無水物、1-シクロヘキセン-1,2-ジカルボン酸無水物cis-4-シクロヘキセン-1,2-ジカルボン酸無水物、5-ノルボルネン-2,3-ジカルボン酸無水物、exo-3,6-エポキシ-1,2,3,6-テトラヒドロフタル酸無水物、およびアリルこはく酸をそれぞれ用いることで、P-6~P-13を合成した。
500mlの三口フラスコに、ビニルホスホン酸(19.5g)、2-アクリルアミド-2-メチルプロパンスルホン酸(14.9g)、マレイン酸無水物(10.6g)、N-メチルピロリドン (180g)を加え窒素気流下、10分間75℃で加熱攪拌した。その後、V-601(1.4g)(和光純薬製)をN-メチルピロリドン(30g)に溶解し、3時間かけて滴下した。その後、V-601(1.4g)を加え90℃で3時間加熱し、加熱終了後冷却した。得られたポリマー溶液に対して、1NのNaOH水溶液を添加しpHを9.7に調整した。その後4-OH-TEMPO(0.2g)を加え、55℃に加熱し2-メタクリルアミドエチルアミン(30g)を添加し、55℃で3時間反応させた。その後、水(200g)、酢酸エチル(800g)を加えて分液操作を行い、下層を回収した。回収した下層にイオン交換樹脂としてAmberlyst 15(15g)加えろ過することで、P-29の水溶液を得た。
(1)平版印刷版原版の作成
〔アルミニウム支持体1の作製〕
厚み0.3mmのアルミニウム板(材質:JIS A1050)の表面の圧延油を除去するため、10質量%アルミン酸ナトリウム水溶液を用いて50℃で30秒間脱脂処理を施した後、毛径0.3mmの束植ナイロンブラシ3本とメジアン径25μmのパミス-水懸濁液(比重1.1g/cm3)を用いアルミニウム表面を砂目立てして、水でよく洗浄した。この板を45℃の25質量%水酸化ナトリウム水溶液に9秒間浸漬してエッチングを行い、水洗後、さらに60℃で20質量%硝酸水溶液に20秒間浸漬し、水洗した。この時の砂目立て表面のエッチング量は約3g/m2であった。
このようにして得られた支持体の中心線平均粗さ(Ra)を直径2μmの針を用いて測定したところ、0.51μmであった。
アルミニウム支持体1を、珪酸ナトリウム1質量%水溶液にて20℃で10秒処理し、アルミニウム支持体2を作製した。その表面粗さを測定したところ、0.54μm(JIS B0601によるRa表示)であった。
厚さ0.24mmのアルミニウム板(材質1050、調質H16)を65℃に保たれた5%水酸化ナトリウム水溶液に浸漬し、1分間の脱脂処理を行った後、水洗した。このアルミニウム板を、25℃に保たれた10%塩酸水溶液中に1分間浸漬して中和した後、水洗した。次いで、このアルミニウム板を、0.3質量%の塩酸水溶液中で、25℃、電流密度100A/dm2の条件下に交流電流により60秒間電解粗面化を行った後、60℃に保たれた5%水酸化ナトリウム水溶液中で10秒間デスマット処理を行った。このアルミニウム板を、15%硫酸水溶液溶液中で、25℃、電流密度10A/dm2、電圧15Vの条件下に1分間陽極酸化処理を行い、アルミニウム支持体を作製した。その表面粗さを測定したところ、0.44μm(JIS B0601によるRa表示)であった。
以下の組成を有する下塗り層塗布液をバーコーターで塗布し、100℃にて1分間乾燥して下塗り層を形成した。下塗り層の乾燥塗布量は12mg/m2であった。
・下記表に記載の重合体または比較用重合体 0.50g
・メタノール 90.0g
・水 10.0g
〔画像記録層1の形成〕
下記組成の画像記録層塗布液1をバー塗布した後、90℃で60秒間オーブン乾燥し、乾燥塗布量1.3g/m2の画像記録層1を形成した。
・下記バインダーポリマー(1) (質量平均分子量:80,000)0.34g
・下記重合性化合物(1) 0.68g
(PLEX6661-O、デグサジャパン製)
・下記増感色素(1) 0.06g
・下記重合開始剤(1) 0.18g
・下記連鎖移動剤(1) 0.02g
・ε―フタロシアニン顔料の分散物 0.40g
(顔料:15質量部、分散剤(アリルメタクリレート/メタクリル酸共重合体(質量平均分子量:6万、共重合モル比:83/17)):10質量部、シクロヘキサノン:15質量部)
・熱重合禁止剤(N-ニトロソフェニルヒドロキシルアミンアルミニウム塩)0.01g
・下記フッ素系界面活性剤(1) (質量平均分子量:10,000)0.001g
・ポリオキシエチレン-ポリオキシプロピレン縮合物 0.02g
((株)ADEKA製、プルロニックL44)
・黄色顔料の分散物 0.04g
(黄色顔料Novoperm Yellow H2G(クラリアント製):15質量部、分散剤(アリルメタクリレート/メタクリル酸共重合体 (質量平均分子量:6万、共重合モル比83/17)):10質量部、シクロヘキサノン:15質量部)
・1-メトキシ-2-プロパノール 3.5g
・メチルエチルケトン 8.0g
下記組成の画像記録層塗布液2をバー塗布した後、90℃で60秒間オーブン乾燥し、乾燥塗布量1.3g/m2の画像記録層を形成した。
<画像記録層塗布液2>
・上記バインダーポリマー(1)(質量平均分子量:5万) 0.04g
・下記バインダーポリマー(2)(質量平均分子量:8万) 0.30g
・上記重合性化合物(1) 0.17g
(PLEX6661-O、デグサジャパン製)
・下記重合性化合物(2) 0.51g
・下記増感色素(2) 0.03g
・下記増感色素(3) 0.015g
・下記増感色素(4) 0.015g
・上記重合開始剤(1) 0.13g
・連鎖移動剤:メルカプトベンゾチアゾール 0.01g
・ε―フタロシアニン顔料の分散物 0.40g
(顔料:15質量部、分散剤(アリルメタクリレート/メタクリル酸共重合体
(質量平均分子量:6万、共重合モル比:83/17)):10質量部、シクロヘキサノン:15質量部)
・熱重合禁止剤(N-ニトロソフェニルヒドロキシルアミンアルミニウム塩)0.01g
・上記フッ素系界面活性剤(1)(質量平均分子量:1万)0.001g
・1-メトキシ-2-プロパノール 3.5g
・メチルエチルケトン 8.0g
下記組成の画像記録層塗布液3をバー塗布した後、100℃で60秒間オーブン乾燥し、乾燥塗布量1.0g/m2の画像記録層を形成した。画像記録層塗布液3は下記感光液(1)および疎水化前駆体液(1)を塗布直前に混合し攪拌することにより調製した。
・下記バインダーポリマー(3) 0.162g
・下記赤外線吸収剤(1) 0.030g
・下記重合開始剤(3) 0.162g
・重合性化合物(アロニックスM215、東亞合成(株)製)0.385g
・パイオニンA-20(竹本油脂(株)製) 0.055g
・下記感脂化剤(1) 0.044g
・上記フッ素系界面活性剤(1) 0.008g
・メチルエチルケトン 1.091g
・1-メトキシ-2-プロパノール 8.609g
・下記疎水化前駆体水分散液(1) 2.640g
・蒸留水 2.425g
1000mlの4つ口フラスコに撹拌機、温度計、滴下ロート、窒素導入管、還流冷却器を施し、窒素ガスを導入して脱酸素を行いつつ蒸留水(350mL)を加えて内温が80℃となるまで加熱した。分散剤としてドデシル硫酸ナトリウム(1.5g)を添加し、さらに開始剤として過硫化アンモニウム(0.45g)を添加し、次いでグリシジルメタクリレート(45.0g)とスチレン(45.0g)との混合物を滴下ロートから約1時間かけて滴下した。滴下終了後5時間そのまま反応を続けた後、水蒸気蒸留で未反応単量体を除去した。その後冷却しアンモニア水でpH6に調整し、最後に不揮発分が15質量%となるように純水を添加してポリマー微粒子からなる疎水化前駆体水分散液(1)を得た。このポリマー微粒子の粒子サイズ分布は、粒子サイズ60nmに極大値を有していた。
以下の組成を有する保護層塗布液1を乾燥塗布量が0.75g/m2となるようにバーを用いて塗布した後、125℃で70秒間乾燥して保護層を形成した。
・ポリビニルアルコール(ケン化度:98モル%、重合度:500)40g
・ポリビニルピロリドン(分子量:5万) 5g
・ポリ〔ビニルピロリドン/酢酸ビニル(1/1)〕(分子量:7万)0.5g
・界面活性剤(エマレックス710、日本エマルジョン(株)製) 0.5g
・水 950g
以下の組成を有する保護層塗布液2を乾燥塗布量が0.75g/m2となるようにバーを用いて塗布した後、125℃で70秒間乾燥して保護層を形成した。
・下記の無機質層状化合物分散液(1) 1.5g
・スルホン酸変性ポリビニルアルコールの6質量%水溶液 0.55g
(日本合成化学工業(株)製CKS50、ケン化度99モル%以上、重合度300)
・ポリビニルアルコール6質量%水溶液 0.03g
((株)クラレ製PVA-405、ケン化度81.5モル%、重合度500)6質量%水溶液
・界面活性剤の1質量%水溶液
(日本エマルジョン(株)製エマレックス710) 0.86g
・イオン交換水 6.0g
イオン交換水193.6gに合成雲母ソマシフME-100(コープケミカル(株)製)6.4gを添加し、混合物をホモジナイザーを用いて平均粒子サイズ(レーザー散乱法)が3μmになるまで分散し、無機質層状化合物分散液(1)を調製した。得られた分散粒子のアスペクト比は100以上であった。
[実施例1~59および比較例1~11]
〔露光、現像および印刷〕
下記表に示す各平版印刷版原版を、FUJIFILM Electronic Imaging Ltd.(FFEI社)製、Violet半導体レーザープレートセッターVx9600(InGaN系半導体レーザー(発光波長405nm±10nm/出力30mW)を搭載)により画像露光した。画像露光は、解像度2、438dpiで、富士フイルム(株)製FMスクリーン(TAFFETA 20)を用い、網点面積率が50%となるように、版面露光量0.05mJ/cm2で行った。
次いで、100℃、30秒間のプレヒートを行った後、下記の各現像液を用い、図2に示すような構造の自動現像処理機にて現像処理を実施した。自動現像処理機は、ポリブチレンテレフタレート製の繊維(毛の直径200μm、毛の長さ17mm)を植え込んだ外径50mmのブラシロールを1本有し、搬送方向と同一方向に毎分200回転(ブラシの先端の周速0.52m/sec)させた。現像液の温度は30℃であった。平版印刷版原版の搬送は、搬送速度100cm/minで行った。現像処理後、乾燥部にて乾燥を行った。乾燥温度は80℃であった。但し、現像液2を用いた際は、現像後乾燥工程を行う前に、水洗を行った。
・炭酸ナトリウム 13.0g
・炭酸水素ナトリウム 7.0g
・ニューコールB13 50.0g
・第一リン酸アンモニウム 2.0g
・2-ブロモ-2-ニトロプロパン-1,3-ジオール 0.01g
・2-メチル-4-イソチアゾリン-3-オン 0.01g
・クエン酸三ナトリウム 15.0g
・蒸留水 913.98g
(pH:9.8)
・水酸化カリウム 0.15g
・ニューコールB13 5.0g
・キレスト400(キレート剤) 0.1g
・蒸留水 94.75g
(pH:12.05)
・アラビアガム 25.0g
・酵素変性馬鈴薯澱粉 70.0g
・ジオクチルスルホコハク酸エステルのナトリウム塩 5.0g
・第一リン酸アンモニウム 1.0g
・クエン酸 1.0g
・2-ブロモ-2-ニトロプロパン-1,3-ジオール 0.01g
・2-メチル-4-イソチアゾリン-3-オン 0.01g
・下記両性界面活性剤(W-1) 70.0g
・下記アニオン性界面活性剤(AN-1) 3.0g
・蒸留水 824.98g
(リン酸および水酸化ナトリウムを添加し、pHを4.5に調整)
・水 937.2g
・下記アニオン系界面活性剤(W-2) 23.8g
・リン酸 3g
・フェノキシプロパノール 5g
・トリエタノールアミン 6g
・ポテトデキストリン 25g
(リン酸を添加し、pHを6.8に調整)
・水 88.6g
・下記ノニオン系界面活性剤(W-3) 2.4g
・下記ノニオン系界面活性剤(W-4) 2.4g
・ノニオン系界面活性剤 1.0g
(エマレックス710、日本エマルジョン(株)製)
・フェノキシプロパノール 1.0g
・オクタノール 0.6g
・N-(2-ヒドロキシエチル)モルホリン 1.0g
・トリエタノールアミン 0.5g
・グルコン酸ナトリウム 1.0g
・クエン酸3ナトリウム 0.5g
・エチレンジアミンテトラアセテート4ナトリウム 0.05g
・ポリスチレンスルホン酸 1.0g
(Versa TL77(30%溶液)、Alco Chemical社製)
(リン酸を添加し、pHを7.0に調整)
各平版印刷版原版について、耐刷性、耐汚れ性、経時後の耐汚れ性および現像性を下記のように評価した。結果を下記表に示す。
<耐刷性>
印刷枚数の増加にともない、徐々に画像記録層が磨耗しインキ受容性が低下するため、印刷用紙におけるインキ濃度が低下した。同一露光量で露光した印刷版において、インキ濃度(反射濃度)が印刷開始時よりも0.1低下したときの印刷枚数により、耐刷性を評価した。耐刷性評価は、実施例1~43および比較例1~6については比較例1を、実施例44~50および比較例7~9については比較例7を、実施例51~59および比較例10~12については比較例10を基準(1.0)として、以下のように定義した相対耐刷性で表した。相対耐刷性の数字が大きい程、耐刷性が高いことを表す。
相対耐刷性=(対象平版印刷版原版の耐刷性)/(基準平版印刷版原版の耐刷性)
印刷開始後20枚目の印刷物を抜き取り、非画像部に付着しているインキ濃度により耐汚れ性を評価した。非画像部のインキ付着は、必ずしも均一に発生するわけではないため、75cm2当りの目視評価の点数で表示した。目視評価の点数は、非画像部のインキ付着面積率が0%の場合を10点、0%を超え10%以下を9点、10%を超え20%以下を8点、20%を超え30%以下を7点、30%を超え40%以下を6点、40%を超え50%以下を5点、50%を超え60%以下を4点、60%を超え70%以下を3点、70%を超え80%以下を2点、80%を超え90%以下を1点、90%を超え100%以下を0点とした。点数の高い程、耐汚れ性が良好であることを表す。
平版印刷版を作製した後、60℃相対湿度60%に設定した恒温恒湿槽中に3日間放置した。この印刷版を用いて、上記耐汚れ性の評価と同様にして経時後の耐汚れ性を評価した。点数の高い程、経時後の耐汚れ性が良好であることを表す。
種々の搬送速度に変更して上記現像処理を行い、得られた平版印刷版の非画像部のシアン濃度をマクベス濃度計により測定した。非画像部のシアン濃度がアルミニウム支持体のシアン濃度と同等になった搬送速度を求め、現像性とした。現像性評価は、実施例1~43および比較例1~6については比較例1を、実施例44~50および比較例7~9については比較例7を、実施例51~59および比較例10~12については比較例10を基準(1.0)として、以下のように定義した相対現像性で表した。相対現像性の数値が大きい程、高現像性であり、性能が良好であることを表す。
相対現像性=(対象平版印刷版原版の搬送速度)/(基準平版印刷版原版の搬送速度)
繰り返し単位の側鎖にエチレン性不飽和基を有しない比較例4、8、11は、耐汚れ性、経時後の耐汚れ性および現像性のバランスが劣ることが分かった。
繰り返し単位の側鎖にエチレン性不飽和結合を有するものの、一般式(1)で表される繰り返し単位を満たさない比較例5、9、12は耐汚れ性および現像性に劣ることが分かった。
一方、本発明の要件を満たす繰り返し単位を有する実施例1~59は、耐刷性を損なうことなく、耐汚れ性、経時後の耐汚れ性および現像性に優れることが分かった。
下記表に示す各平版印刷版原版を、Creo社製、Trendsetter3244VX(水冷式40W赤外線半導体レーザー(830nm)搭載)にて、出力9W、外面ドラム回転数210rpm、解像度2、400dpiの条件で50%平網の画像露光を行った。次いで、現像液1または4を用い、図1に示す構造の自動現像処理機にて、プレヒート部での版面到達温度が100℃となるヒーター設定、現像液中への浸漬時間(現像時間)が20秒となる搬送速度にて現像処理を実施した。
繰り返し単位の側鎖にエチレン性不飽和結合を有するものの、一般式(1)で表される繰り返し単位を含まない、比較例14、16は耐汚れ性および現像性に劣ることが分かった。
一方、本発明の要件を満たす繰り返し単位を有する実施例60~73は、耐刷性を損なうことなく、耐汚れ性、経時後の耐汚れ性および現像性に優れることが分かった。
下記表に示す各平版印刷版原版を、赤外線半導体レーザー搭載の富士フイルム(株)製、Luxel PLATESETTER T-6000IIIにて、外面ドラム回転数1000rpm、レーザー出力70%、解像度2400dpiの条件で露光した。露光画像にはベタ画像および20μmドットFMスクリーンの50%網点チャートを含むようにした。露光済み平版印刷版原版を現像処理することなく、(株)小森コーポレーション製印刷機LITHRONE26の版胴に取り付けた。Ecolity-2(富士フイルム(株)製)/水道水=2/98(容量比)の湿し水とValues-G(N)墨インキ(大日本インキ化学工業(株)製)とを用い、LITHRONE26の標準自動印刷スタート方法で湿し水とインキとを供給して機上現像した後、毎時10000枚の印刷速度で、特菱アート(76.5kg)紙に印刷を100枚行った。
各平版印刷版原版について、機上現像性および耐刷性を下記のように評価した。耐汚れ性および経時後の耐汚れ性については実施例1と同様にして評価した。結果を下記表に示す。
画像記録層の非画像部の印刷機上での機上現像が完了し、非画像部にインキが転写しない状態になるまでに要した印刷用紙の枚数を機上現像性として計測した。
上記機上現像性の評価を行った後、さらに印刷を続けた。印刷枚数の増加にともない、徐々に画像記録層が磨耗するため印刷物上のインキ濃度が低下した。印刷物におけるFMスクリーン50%網点の網点面積率をグレタグ濃度計で計測した値が、印刷100枚目の計測値よりも5%低下したときの印刷部数を刷了枚数として耐刷性を評価した。耐刷性評価は、比較例17を基準(1.0)として以下のように定義した相対耐刷性で表した。相対耐刷性の数字が大きい程、耐刷性が高いことを表す。
相対耐刷性=(対象平版印刷版原版の耐刷性)/(基準平版印刷版原版の耐刷性)
繰り返し単位の側鎖にエチレン性不飽和結合を有するものの、一般式(1)で表される繰り返し単位を有さない比較例18は耐汚れ性および機上現像性に劣ることが分かる。
一方、本発明の要件を満たす繰り返し単位を有する実施例74~80は、耐刷性を損なうことなく、耐汚れ性、経時後の耐汚れ性および現像性に優れることが分かった。
Claims (16)
- 前記重合体(A)が、一般式(2)で表される繰り返し単位および/または一般式(3)で表される繰り返し単位を含む、請求項1に記載の平版印刷版原版。
一般式(2)
一般式(3)
- 前記重合体(A)が、一般式(3)で表される繰り返し単位、一般式(4)で表される繰り返し単位および一般式(5)で表される繰り返し単位の少なくとも1種を含む、請求項1に記載の平版印刷版原版。
一般式(3)
一般式(4)
一般式(5)
- 前記重合体(A)が、さらに、(a2)支持体表面と相互作用する構造を側鎖に有する繰り返し単位および/または(a3)親水性基を側鎖に有する繰り返し単位を含むことを特徴とする、請求項1~3いずれか1項記載の平版印刷版原版。
- 前記(a2)支持体表面と相互作用する構造を側鎖に有する繰り返し単位が、下記一般式(a2-1)~(a2-6)で表される構造のいずれか1種以上を側鎖に有する、請求項4に記載の平版印刷版原版。
- 前記(a3)親水性基を側鎖に有する繰り返し単位が、下記一般式(a3-1)および/または(a3-2)で表される構造のいずれかを側鎖に有する、請求項4または5に記載の平版印刷版原版。
- 前記重合体(A)が、下記(a2)および(a3)を含有することを特徴とする共重合体である、請求項1に記載の平版印刷版原版。
(a2)一般式(a2-1)~(a2-6)で表される構造のいずれか1種以上を側鎖に有する繰り返し単位
(a3)一般式(a3-1)および/または(a3-2)で表される構造を側鎖に有する繰り返し単位
- 前記一般式(2)におけるL1、一般式(3)におけるL101、一般式(4)におけるL11、一般式(5)におけるL21が、2価の脂肪族基であり、前記一般式(2)におけるL2、一般式(3)におけるL102、一般式(4)におけるL12、一般式(5)におけるL22が、単結合または2価の脂肪族基である、請求項2~7のいずれか1項に記載の平版印刷版原版。
- 画像記録層が、(B)重合開始剤、(C)重合性化合物および(D)バインダーを含む、請求項1~8のいずれか1項に記載の平版印刷版原版。
- 画像記録層が、pHが2~14の水溶液により除去可能である、請求項1~9のいずれか1項に記載の平版印刷版原版。
- 画像記録層が、印刷インキおよび湿し水の少なくとも一方により除去可能である、請求項1~10のいずれか1項に記載の平版印刷版原版。
- 請求項1~11のいずれか1項に記載の平版印刷版原版を、画像様に露光する工程と、露光した前記平版印刷版原版を、pHが2~14の現像液の存在下で、非露光部の画像記録層を除去する工程とを含むことを特徴とする平版印刷版の製造方法。
- 画像記録層の前記支持体とは反対側の表面上に、保護層を形成する工程を含み;
現像工程において、さらに界面活性剤を含有する前記現像液の存在下、非露光部の画像記録層と前記保護層とを同時に除去する工程を含む(但し、水洗工程を含まない)、ことを特徴とする請求項12に記載の平版印刷版の製造方法。 - 請求項1~11のいずれかに記載の平版印刷版原版を、画像様に露光する工程と、
印刷機上で印刷インキと湿し水を供給して非露光部の前記画像記録層を除去する工程とを含むことを特徴とする平版印刷版の製造方法。 - 下記(a1)~(a3)を含有することを特徴とする共重合体。
(a1)一般式(1)で表される繰り返し単位
一般式(1)
(a2)一般式(a2-1)~(a2-6)で表される構造のいずれか1種以上を側鎖に有する繰り返し単位
(a3)一般式(a3-1)および/または(a3-2)で表される構造を側鎖に有する繰り返し単位
- 一般式(1)で表される繰り返し単位が一般式(4)で表される繰り返し単位または一般式(5)で表される繰り返し単位である、請求項15に記載の共重合体。
一般式(4)
一般式(5)
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US10197912B2 (en) | 2013-05-24 | 2019-02-05 | Boe Technology Group Co., Ltd. | Method for manufacturing color photoresist pattern in color filter |
JPWO2020026957A1 (ja) * | 2018-07-31 | 2021-08-19 | 富士フイルム株式会社 | 平版印刷版原版、及び、捨て版原版 |
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