WO2014050359A1 - 平版印刷版原版及び平版印刷版の製版方法 - Google Patents
平版印刷版原版及び平版印刷版の製版方法 Download PDFInfo
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- WO2014050359A1 WO2014050359A1 PCT/JP2013/072112 JP2013072112W WO2014050359A1 WO 2014050359 A1 WO2014050359 A1 WO 2014050359A1 JP 2013072112 W JP2013072112 W JP 2013072112W WO 2014050359 A1 WO2014050359 A1 WO 2014050359A1
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- printing plate
- lithographic printing
- recording layer
- plate precursor
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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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/3085—Imagewise removal using liquid means from plates or webs transported vertically; from plates suspended or immersed vertically in the processing unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
- B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
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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
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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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
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
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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
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
- G03F7/031—Organic compounds not covered by group G03F7/029
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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
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
- G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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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
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
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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
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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
- G03F7/20—Exposure; Apparatus therefor
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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
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
- G03F7/2053—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a laser
- G03F7/2055—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source using a laser for the production of printing plates; Exposure of liquid photohardening compositions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/08—Developable by water or the fountain solution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers
Definitions
- the present invention relates to a lithographic printing plate precursor and a lithographic printing method.
- the present invention relates to a lithographic printing plate precursor suitably used for a lithographic printing plate precursor capable of direct plate making using various lasers from a digital signal from a computer or the like, and a lithographic printing plate making method using the same.
- a lithographic printing plate comprises an oleophilic image area that receives ink in the printing process and a hydrophilic non-image area that receives dampening water.
- Lithographic printing utilizes the property that water and oil-based inks repel each other, so that the oleophilic image area of the lithographic printing plate is the ink receiving area, and the hydrophilic non-image area is dampened with the water receiving area (ink non-receiving area).
- a difference in ink adhesion is caused on the surface of the lithographic printing plate, and after ink is applied only to the image area, the ink is transferred to a printing medium such as paper and printed.
- a lithographic printing plate precursor in which an oleophilic photosensitive resin layer (image recording layer) is provided on a hydrophilic support is used.
- a mask such as a film
- development with an alkaline developer is performed to leave the image recording layer corresponding to the image area, and dissolve and remove the unnecessary image recording layer corresponding to the non-image area. And obtained a lithographic printing plate.
- lithographic printing plates are now available with CTP (computer to plate) technology. That is, a lithographic printing plate can be obtained by scanning and exposing a lithographic printing plate precursor directly using a laser or a laser diode without a lith film, and developing it.
- CTP computer to plate
- a method called “on-press development” is performed. That is, after the exposure of the lithographic printing plate precursor, conventional development is not performed, but it is mounted on a printing machine as it is, and unnecessary portions of the image recording layer are removed at the initial stage of a normal printing process.
- a method called “gum development” in which unnecessary portions of the image recording layer are removed with a finisher or gum solution having a pH close to neutral instead of a conventional highly alkaline developer is also performed. ing.
- a system using a lithographic printing plate precursor and a light source that can be handled in a bright room or under a yellow light is preferable from the viewpoint of ease of work.
- a solid-state laser such as a semiconductor laser or a YAG laser emitting an infrared ray of 1200 nm is used.
- Patent Documents 1 and 2 As a lithographic printing plate precursor capable of on-machine development, for example, in Patent Documents 1 and 2, a lithographic printing plate having an image recording layer (thermosensitive layer) containing a microcapsule containing a polymerizable compound on a hydrophilic support. The original edition is listed. Patent Document 3 describes a lithographic printing plate precursor in which an image recording layer (photosensitive layer) containing an infrared absorber, a radical polymerization initiator, and a polymerizable compound is provided on a support.
- Patent Document 4 on-press development is possible in which an image recording layer containing a polymerizable compound and a graft polymer having a polyethylene oxide chain in the side chain or a block polymer having a polyethylene oxide block is provided on a support.
- a planographic printing plate precursor is described.
- Patent Document 5 describes a lithographic printing plate precursor capable of on-press development provided with an image recording layer containing a specific development accelerator.
- Patent Document 6 describes a lithographic printing plate precursor capable of on-press development provided with an image recording layer containing a specific acid group or a salt thereof.
- Japanese Unexamined Patent Publication No. 2001-277740 Japanese Laid-Open Patent Publication No. 2001-277742 Japanese Patent Laid-Open No. 2002-287334 US Patent Application Publication No. 2003/0064318 Japanese Unexamined Patent Publication No. 2008-284817 Japanese Unexamined Patent Publication No. 2009-154525
- the present invention has been made in view of the above, and an object of the present invention is to use a lithographic printing plate precursor capable of obtaining good developability while maintaining the printing durability of the lithographic printing plate after development. It is to provide a plate making method of a lithographic printing plate.
- the lithographic printing plate precursor wherein the image recording layer contains an infrared absorber, a polymerization initiator, a polymerizable compound, and a polysaccharide having a group consisting of a sulfonic acid group or a salt thereof.
- [5] A method of supplying the printing ink and fountain solution by mounting the lithographic printing plate precursor according to any one of [1] to [4] above on the printing press after imagewise exposure
- the lithographic printing plate precursor according to the invention contains, on a support, an infrared absorber, a polymerization initiator, a polymerizable compound, and a polysaccharide having a group consisting of a sulfonic acid group or a salt thereof, printing ink and dampening. It has an image recording layer that can be removed by at least one of water.
- the image recording layer contains a polysaccharide having a group consisting of a sulfonic acid group or a salt thereof, the hydrophilicity is increased, and the permeability of dampening water in the unexposed area (corresponding to the non-image area) is improved.
- a lithographic printing plate precursor capable of obtaining good developability while maintaining the printing durability of the lithographic printing plate after development, and a lithographic printing plate making method using the same.
- the planographic printing plate precursor of the present invention is an image-recording layer on which an image can be formed on a support by supplying at least one of printing ink and dampening water on a printing machine after image exposure to remove unexposed portions.
- the image recording layer contains an infrared absorber, a polymerization initiator, a polymerizable compound, and a polysaccharide having a group consisting of a sulfonic acid group or a salt thereof.
- an undercoat layer can be provided between the support and the image recording layer, and a protective layer can be provided on the image recording layer, if necessary.
- the image recording layer in the lithographic printing plate precursor according to the invention contains an infrared absorber, a polymerization initiator, a polymerizable compound, and a polysaccharide having a group consisting of a sulfonic acid group or a salt thereof.
- the infrared absorber used in the polymerizable composition is in an excited state by absorbing light at the time of image exposure, and imparts energy to the polymerization initiator by electron transfer, energy transfer or heat generation, and improves the polymerization initiation function. If there is no particular limitation, it can be used. In particular, an infrared absorber having a maximum absorption in a wavelength region of 750 to 1400 nm is preferably used. As the 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 (IV).
- X 1 represents a hydrogen atom, a halogen atom, —N (R 9 ) (R 10 ), —X 2 -L 1 or a group shown below.
- R 9 and R 10 may be the same or different, and may have a substituent, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or an alkyl group having 1 to 8 carbon atoms.
- X 2 represents an oxygen atom or a sulfur atom
- L 1 includes a hydrocarbon group having 1 to 12 carbon atoms, an aromatic ring having a hetero atom (N, S, O, halogen atom, Se), or a hetero atom
- a hydrocarbon group having 1 to 12 carbon atoms is shown. It is Z a to be described later - - formula X a of the same definition, R a represents a hydrogen atom, an alkyl group, an aryl group, a substituted or unsubstituted amino group, substituted or unsubstituted amino group and a halogen atom.
- R 1 and R 2 in the general formula (IV) each independently represent a hydrocarbon group having 1 to 12 carbon atoms.
- R 1 and R 2 are preferably hydrocarbon groups having 2 or more carbon atoms.
- R 1 and R 2 may be connected to each other to form a ring, and when a ring is formed, it is particularly preferable to form a 5-membered ring or a 6-membered ring.
- Ar 1 and Ar 2 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 1 and Y 2 may be the same or different and each represents a sulfur atom or a dialkylmethylene group having 12 or less carbon atoms.
- R 3 and R 4 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 an alkoxy group having 12 or less carbon atoms, a carboxy group, and a sulfo group.
- R 5 , R 6 , R 7 and R 8 may be the same or different and each represents a hydrogen atom or a hydrocarbon group having 12 or less carbon atoms. In view of easy availability of the raw material, a hydrogen atom is preferred.
- Z a - represents a counter anion. However, when the cyanine dye represented by the general formula (IV) 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, from the storage stability of the polymerizable composition solution. , Hexafluorophosphate ions and aryl sulfonate ions.
- cyanine dye represented by the general formula (IV) include the compounds described in paragraph numbers [0017] to [0019] of JP-A No. 2001-133969, and the paragraph number [0016 of JP-A No. 2002-023360. ] To [0021], compounds described in paragraph numbers [0012] to [0037] of JP-A No. 2002-040638, preferably paragraph numbers [0034] to [0041] of JP-A No. 2002-278057, JP The compounds described in paragraph numbers [0080] to [0086] of 2008-195018, and particularly preferably the compounds described in paragraphs [0035] to [0043] of JP-A-2007-90850 are exemplified.
- infrared absorber Only one infrared absorber may be used, or two or more infrared absorbers may be used in combination, or an infrared absorber such as a pigment may be used in combination.
- an infrared absorber such as a pigment may be used in combination.
- the pigment compounds described in paragraph numbers [0072] to [0076] of JP-A-2008-195018 are preferable.
- the content of the infrared absorber is preferably 0.05 to 30 parts by mass, more preferably 0.1 to 20 parts by mass, and particularly preferably 0.2 to 10 parts by mass with respect to 100 parts by mass of the total solid content of the image recording layer. Part by mass.
- Polymerization initiator As a polymerization initiator used for this invention, the compound which starts and accelerates
- a radical polymerization initiator is preferable, and a known thermal polymerization initiator, a compound having a bond with a small bond dissociation energy, a photopolymerization initiator, and the like can be used.
- Examples of the polymerization initiator in the present invention include (a) an organic halide, (b) a carbonyl compound, (c) an azo compound, (d) an organic peroxide, (e) a metallocene compound, (f) an azide compound, (G) hexaarylbiimidazole compound, (h) organic borate compound, (i) disulfone compound, (j) oxime ester compound, (k) onium salt compound.
- azo compound for example, an azo compound described in JP-A-8-108621 can be used.
- (d) organic peroxide for example, compounds described in paragraph [0025] of JP-A-2008-195018 are preferable.
- (e) metallocene compound for example, compounds described in paragraph [0026] of JP-A-2008-195018 are preferred.
- Examples of the azide compound include 2,6-bis (4-azidobenzylidene) -4-methylcyclohexanone.
- Examples of the hexaarylbiimidazole compound for example, the compound described in paragraph [0027] of JP-A-2008-195018 is preferable.
- organic borate compound for example, compounds described in paragraph [0028] of JP-A-2008-195018 are preferred.
- Examples of the (i) disulfone compound include compounds described in JP-A Nos. 61-166544 and 2002-328465.
- onium salt compounds 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.
- onium salts especially iodonium salts, sulfonium salts and azinium salts.
- iodonium salts especially iodonium salts, sulfonium salts and azinium salts.
- iodonium salts include diphenyl iodonium salts, particularly diphenyl iodonium salts substituted with an electron donating group such as an alkyl group or an alkoxyl group, and more preferably asymmetric diphenyl iodonium salts.
- 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
- the polymerization initiator in the present invention is preferably 0.1 to 50% by mass, more preferably 0.5 to 30% by mass, and particularly preferably 0.8 to 20% by mass with respect to the total solid content constituting the image recording layer. Can be added at a ratio of Within this range, good sensitivity and good stain resistance of the non-image area during printing can be obtained.
- Polymerizable compound there is no restriction
- a polymerizable compound having at least one ethylenically unsaturated double bond is preferable, a polymerizable compound having at least one terminal ethylenically unsaturated bond is more preferable, and a terminal ethylenically unsaturated bond is present.
- a polymerizable compound having at least two or more is particularly preferable.
- the preferred polymerizable compounds 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.
- An ester of an acid and a polyhydric alcohol compound and an amide of an unsaturated carboxylic acid and a polyvalent amine compound are used.
- a dehydration condensation reaction product with a functional carboxylic acid is also preferably used.
- 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.
- 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, It is described in references including Kaihei 10-333321.
- monomers of esters of polyhydric alcohol compounds and unsaturated carboxylic acids include acrylic acid esters such as ethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, propylene glycol diacrylate, Examples include trimethylolpropane triacrylate, hexanediol diacrylate, tetraethylene glycol diacrylate, pentaerythritol tetraacrylate, sorbitol triacrylate, isocyanuric acid ethylene oxide (EO) -modified triacrylate, and polyester acrylate oligomer.
- acrylic acid esters such as ethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, propylene glycol diacrylate
- Examples include trimethylolpropane triacrylate, hexanediol diacrylate, tetraethylene glycol diacrylate, pentaery
- 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 vinylurethane 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 (A) to a polyisocyanate compound having two or more isocyanate groups Etc.
- CH 2 C (R 4) COOCH 2 CH (R 5) OH (A) (However, R 4 and R 5 each independently 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.
- Acrylates, JP-B 58-49860, JP-B 56-17654, JP-B 62-39417, JP-B 62-39418, JP-A 2000-250211, JP-A 2007-94138 Urethane compounds having an ethylene oxide-based skeleton described in the publication, and urethane compounds having a hydrophilic group described in US Pat. No.
- JP-T 8-505958, JP-A 2007-293221, and JP-A 2007-293223. are also suitable.
- tris (acryloyloxyethyl) isocyanurate, bis (acryloyloxyethyl) hydroxyethyl isocyanurate, etc. are excellent in the balance between the hydrophilicity involved in on-press developability and the polymerization ability involved in printing durability.
- Isocyanuric acid ethylene oxide modified acrylates are particularly preferred.
- the polymerizable compound is preferably used in the range of 5 to 75% by mass, more preferably 7 to 70% by mass, and particularly preferably 10 to 60% by mass with respect to the total solid content of the image recording layer.
- the polysaccharide having a group consisting of a sulfonic acid group or a salt thereof preferably has a structure represented by the following general formula (A).
- A represents an ethylene group or a propylene group
- X + represents a hydrogen ion, an alkali metal ion, or an ammonium ion.
- alkali metal ions include lithium ions, sodium ions, and potassium ions.
- ammonium ions include inorganic ammonium ions and organic ammonium ions.
- organic ammonium ion include NH 3 (R1) + , NH 2 (R1) (R2) + , NH (R1) (R2) (R3) + , N (R1) (R2) (R3) (R4) + and the like. Is mentioned.
- R1 to R4 each independently represents an alkyl group having 1 to 6 carbon atoms.
- polysaccharide examples include dextrin having glucose as a unit sugar, starch, cellulose, glucan, glycogen pullulan, etc .; inulin having fructose as a unit sugar , Levan, or fructooligosaccharide; chitin having N-acetylglucosamine as a unit sugar; garto oligosaccharide having galactose as a unit sugar; mannan oligosaccharide etc. having a mannose as a unit sugar.
- the polysaccharide may be a polysaccharide composed of two or more kinds of unit sugars.
- a polysaccharide skeleton include raffinose and stachyose (galactose / fructose / glucose). It is done. Among them, dextrin, starch, cellulose, glucan, or glycogen pullulan is preferable, and cellulose is particularly preferable.
- the polysaccharide having a group consisting of a sulfonic acid group or a salt thereof is preferably cellulose having a repeating unit represented by the following general formula (1).
- R independently represents a hydrogen atom, an alkyl group, hydroxyalkyl group, carboxyalkyl group, or, -L-SO 3 - represents an X +.
- n represents an integer of 2 or more.
- L and X + are synonymous with L and X + in the general formula (A), respectively.
- the number of R that represent the X + (degree of substitution) is 0.3 to 2.5.
- the “degree of substitution” means the average number of substituents in which the hydrogen atom of the hydroxyl group is modified per monosaccharide of the polysaccharide (ie, corresponding to the above repeating unit).
- the degree of substitution is 3.
- the number (substitution degree) of R representing —L—SO 3 — X + is more preferably from 0.35 to 2, and further preferably from 0.4 to 1.2.
- n is preferably 6 to 3000.
- Examples of the alkyl group as R include a methyl group and an ethyl group.
- Examples of the hydroxyalkyl group as R include a hydroxypropyl group and a hydroxyethyl group.
- Examples of the carboxyalkyl group as R include a carboxymethyl group.
- Synthesis method As a method for synthesizing a polysaccharide having a sulfonic acid group or a salt thereof, a method according to the sulfonation of cellulose described in JP-A-9-227601 and the like, in addition to a polysaccharide such as cellulose, And a method of reacting with a sulfoalkylating agent such as vinylsulfonic acid or a metal salt thereof, ⁇ -chloroethanesulfonic acid or a metal salt thereof, butanesultone or propanesultone.
- a sulfoalkylating agent such as vinylsulfonic acid or a metal salt thereof, ⁇ -chloroethanesulfonic acid or a metal salt thereof, butanesultone or propanesultone.
- the structure of the adduct having a group consisting of a sulfonic acid group or a salt thereof to be reacted with the polysaccharide as the mother nucleus has a group consisting of a sulfonic acid group or a salt thereof at one end and a halogen atom at the other end.
- a compound having (F, Cl, Br, I, etc.) is preferable, and a compound represented by the following formula (I) is more preferable.
- X + has the same meaning as X + in the formula (A).
- n represents an integer of 1 to 10.
- X + is the same as that described in X + in the formula (A).
- n is preferably 2 or 3.
- the structure of the adduct having a sulfonic acid group or a group consisting of a salt thereof to be reacted with a polysaccharide serving as a mother nucleus is preferably a cyclic compound represented by the following formula (II).
- M represents an integer of 1 to 3.
- the mass average molecular weight of the polysaccharide having a sulfonic acid group or a salt thereof is preferably 1000 to 50000, more preferably 2000 to 50000, and still more preferably 3000 to 30000.
- the mass average molecular weight can be measured by a usual method using GPC (Gel Permeation Chromatography).
- the polysaccharide having a group consisting of a sulfonic acid group or a salt thereof is preferably 0.5 to 40% by mass, more preferably 1 to 30% by mass, and still more preferably based on the total solid content constituting the image recording layer. 2 to 25% by mass.
- the image recording layer in the present invention usually contains a binder polymer in order to impart film properties.
- a binder polymer that can be used in the present invention, conventionally known binder polymers can be used without limitation as long as they can impart film properties. It may be a linear binder polymer or a star polymer structure as described in JP-A-2007-249036.
- the following addition polymers and urethane resins having a crosslinkable group in the side chain can be mentioned as preferred.
- the image recording layer is an image recording layer capable of forming an image by supplying at least one of printing ink and dampening water on a printing machine and removing an unexposed portion.
- a binder polymer having an alkylene oxide group is preferable.
- the binder polymer having an alkylene oxide group used in the image recording layer of the lithographic printing plate precursor according to the invention may have a poly (alkylene oxide) moiety in the main chain or in the side chain.
- a graft polymer having (alkylene oxide) in the side chain may be a block copolymer of a block composed of a poly (alkylene oxide) -containing repeating unit and a block composed of a (alkylene oxide) -free repeating unit.
- a polyurethane resin is preferable.
- the main chain polymer in the case of the side chain includes acrylic resin, polyvinyl acetal resin, polyurethane resin, polyurea resin, polyimide resin, polyamide resin, epoxy resin, methacrylic resin, polystyrene resin, novolac type phenol resin, polyester resin Synthetic rubber and natural rubber can be mentioned, and acrylic resin is particularly preferable.
- the alkylene oxide is preferably an alkylene oxide having 2 to 6 carbon atoms, particularly ethylene oxide or propylene oxide.
- the number of alkylene oxide repeats at the poly (alkylene oxide) site is 2 to 120, preferably 2 to 70, and more preferably 2 to 50. If the number of alkylene oxide repeats is 120 or less, both the printing durability due to abrasion and the printing durability due to ink acceptance are not lowered, which is preferable.
- the poly (alkylene oxide) moiety is preferably contained as a side chain of the binder polymer in a structure represented by the following general formula (a). More preferably, it is contained as a side chain of the acrylic resin in a structure represented by the following general formula (a).
- y represents 2 to 120, preferably 2 to 70, and more preferably 2 to 50.
- R 1 represents a hydrogen atom or an alkyl group
- R 2 represents a hydrogen atom or an organic group.
- an alkyl group having 1 to 6 carbon atoms is preferable, and a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, isobutyl group, t-butyl group, n -Pentyl group, isopentyl group, neopentyl group, n-hexyl group, isohexyl group, 1,1-dimethylbutyl group, 2,2-dimethylbutyl group, cyclopentyl group, and cyclohexyl group.
- R 1 is preferably a hydrogen atom or a methyl group, and most preferably a hydrogen atom.
- R 2 is most
- the binder polymer may have crosslinkability in order to improve the film strength of the image area.
- a crosslinkable functional group such as an ethylenically unsaturated bond may be introduced into the main chain or side chain of the polymer.
- the crosslinkable functional group may be introduced by copolymerization. Examples of the polymer having an ethylenically unsaturated bond in the main chain of the molecule include poly-1,4-butadiene and poly-1,4-isoprene.
- polymers having an ethylenically unsaturated bond in the side chain of the molecule are polymers of esters or amides of acrylic acid or methacrylic acid, where the ester or amide residue (-COOR or CONHR R) is ethylene.
- ester or amide residue is ethylene.
- polymers having a polymerizable unsaturated bond examples include polymers having a polymerizable unsaturated bond.
- R 1 to R 3 are each independently a hydrogen atom, a halogen atom or an alkyl group having 1 to 20 carbon atoms, aryl R 1 and R 2 or R 3 may be bonded to each other to form a ring, n represents an integer of 1 to 10, and X represents dicyclopentadi.
- Specific examples of the amide residue include —CH 2 CH ⁇ CH 2 , —CH 2 CH 2 —Y (wherein Y represents a cyclohexene residue), —CH 2 CH 2 —OCO—CH ⁇ CH 2. Is mentioned.
- the binder polymer having crosslinkability for example, has a free radical (polymerization initiation radical or a growth radical in the polymerization process of the polymerizable compound) added to the crosslinkable functional group, and the polymerization chain of the polymerizable compound is formed directly between the polymers. Through addition polymerization, a cross-link is formed between the polymer molecules and cured.
- atoms in the polymer eg, hydrogen atoms on carbon atoms adjacent to the functional bridging group
- free radicals in the polymer are abstracted by free radicals to form polymer radicals that are bonded together, thereby causing cross-linking between polymer molecules. Forms and cures.
- the content of the crosslinkable group in the binder polymer is preferably 0.1 to 10.0 mmol, more preferably 1. It is 0 to 7.0 mmol, most preferably 2.0 to 5.5 mmol. Within this range, good sensitivity and good storage stability can be obtained.
- a numerical value written together with each repeating unit represents a mole percentage of the repeating unit.
- the numerical value written together with the repeating unit of the side chain indicates the number of repetitions of the repeating site.
- the mass average molar mass (Mw) of the binder polymer in the present invention is preferably 2000 or more, more preferably 5000 or more, and more preferably 10,000 to 300,000 as a polystyrene conversion value by the GPC method. Is more preferable.
- hydrophilic polymer compounds such as polyacrylic acid and polyvinyl alcohol described in JP-A-2008-195018 can be used in combination. Further, a lipophilic polymer compound and a hydrophilic polymer compound can be used in combination.
- the form of the binder polymer may be present in the image recording layer as a binder that serves as a linking function for each material, or may be present in the form of fine particles.
- the average particle size is in the range of 10 to 1000 nm, preferably in the range of 20 to 300 nm, particularly preferably in the range of 30 to 120 nm.
- the content of the binder polymer of the present invention is preferably 5 to 90% by mass, more preferably 5 to 80% by mass, and still more preferably 10 to 70% by mass with respect to the total solid content constituting the image recording layer.
- the preferred combination of the polymerization initiator, sensitizing dye, polymerizable compound and binder polymer of the present invention is most preferably a combination of the preferred embodiments.
- the image recording layer in the invention can contain fine polymer particles in order to improve developability.
- polymer fine particles having a polyalkylene oxide structure are preferred.
- polymer fine particles having a polyalkylene oxide group in the side chain are preferred.
- the polyalkylene oxide structure is preferably an alkylene oxide structure having 2 to 120 alkylene oxide units having 2 or 3 carbon atoms, and more preferably a polyethylene oxide structure having 2 to 120 ethylene oxide units.
- a polyethylene oxide structure having 20 to 100 ethylene oxide units is preferred.
- the fine polymer particles having such a polyalkylene oxide structure can achieve both printing durability and developability. Moreover, the inking property can be improved.
- the polymer fine particles in the present invention are preferably hydrophobized precursors that can convert the image recording layer to hydrophobic when heat is applied.
- the hydrophobized precursor polymer fine particles are preferably at least one particle selected from hydrophobic thermoplastic polymer fine particles, heat-reactive polymer fine particles, microcapsules enclosing a hydrophobic compound, and microgel (crosslinked polymer fine particles).
- polymer fine particles and microgels having a polymerizable group are preferable.
- it may have a polyalkylene oxide structure as described above.
- Hydrophobic thermoplastic polymer fine particles include Research Disclosure No. 1 of January 1992. 33303, hydrophobic thermoplastic polymer fine particles described in JP-A-9-123387, JP-A-9-131850, JP-A-9-171249, JP-A-9-171250, European Patent 931647, etc. are suitable.
- Can be cited as 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 hydrophobic region by cross-linking due to a heat reaction and a functional group change at that time.
- the thermally reactive group in the polymer fine particle having a thermally reactive group used in the present invention may be any functional group that performs a reaction as long as a chemical bond is formed, but is an ethylenically unsaturated group that performs a radical polymerization reaction.
- a functional group having an active hydrogen atom as a reaction partner for example, an amino group, a hydroxy group, a carboxy group, etc.
- a carboxy group for performing a condensation reaction for example, a hydroxy group or an amino group as a reaction partner, a ring-opening addition reaction
- suitable acid anhydrides and amino or hydroxy groups that are reaction partners That.
- microcapsules used in the present invention include all or part of the constituent components of the image recording layer as described in JP-A-2001-277740, JP-A-2001-277742, and EP2383118. Is included.
- the constituent components of the image recording layer can also be contained outside the microcapsules.
- the image recording layer containing the microcapsule includes a hydrophobic constituent component in the microcapsule and a hydrophilic constituent component outside the microcapsule.
- a cross-linked resin particle that is, an embodiment containing microgel may be used.
- This microgel can contain a part of the constituent components of the image recording layer in and / or on the surface thereof.
- the microgel has a reactive microgel by having (B) a polymerizable compound on the surface thereof. From the viewpoint of image formation sensitivity and printing durability, it is particularly preferable.
- the average particle size of the above microcapsules and microgels is preferably 0.01 to 3.0 ⁇ m. 0.05 to 2.0 ⁇ m is more preferable, and 0.10 to 1.0 ⁇ m is particularly preferable. Within this range, good resolution and stability over time can be obtained.
- the content of polymer fine particles is preferably in the range of 5 to 90% by mass of the total solid content of the image recording layer.
- the image recording layer of the present invention may further contain the following components as necessary.
- the image recording layer in the invention 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 for example, as the water-soluble organic compound, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol and the like glycols 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, organic sulfones such as alkylsulfonic acid, toluenesulfonic acid and benzenesulfonic acid Acids and salts thereof, organic sulfamic acids such as alkylsulfamic acid and salts thereof, organic sulfuric acids such
- organic sulfonates include alkyl sulfonates 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 polyethylene oxide alkyl, alkenyl, alkynyl, aryl or heterocyclic monoether sulfates.
- 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.
- betaines compounds in which the hydrocarbon substituent on the nitrogen atom has 1 to 5 carbon atoms are preferable.
- Specific examples include trimethylammonium acetate, dimethylpropylammonium acetate, 3-hydroxy-4-trimethyl.
- the above low molecular weight hydrophilic compound has a small hydrophobic part structure and almost no surface-active action, so that dampening water penetrates into the exposed part of the image recording layer (image part) and the hydrophobicity and film strength of the image part. Ink acceptability and printing durability of the image recording layer can be maintained satisfactorily.
- the amount of these low molecular weight hydrophilic compounds added to the image recording layer is preferably 0.5% by mass or more and 20% by mass or less of the total solid content of the image recording layer. More preferably, they are 1 mass% or more and 15 mass% or less, More preferably, they are 2 mass% or more and 10 mass% or less. In this range, good on-press developability and printing durability can be obtained. These compounds may be used alone or in combination of two or more.
- a sensitizing agent such as a phosphonium compound, a nitrogen-containing low molecular weight compound, or an ammonium group-containing polymer can be used in the image recording layer in order to improve the inking property.
- these compounds function as a surface coating agent for the inorganic layered compound, and prevent a decrease in the inking property during printing by the inorganic layered 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 preferable.
- 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 paragraphs [0089] to [0105] of JP2009-208458A.
- the ammonium salt-containing polymer has a reduced specific viscosity (unit: ml / g) determined by the following measurement method, preferably 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.
- Mw mass average molar mass
- ⁇ Measurement method of reduced specific viscosity> 1 g of polymer solid content was weighed into a 20 ml volumetric flask and diluted with N-methylpyrrolidone. This solution is allowed to stand for 30 minutes in a constant temperature bath at 30 ° C., placed in an Ubbelohde reduced specific viscosity tube (viscosity constant 0.010 cSt / s), and the time for flowing down at 30 ° C. is measured. The measurement is performed twice with the same sample, and the average value is calculated. Similarly, in the case of a blank (N-methylpyrrolidone only), the reduced specific viscosity (ml / g) was calculated from the following formula.
- the content of the sensitizer is preferably 0.01 to 30.0% by mass, more preferably 0.1 to 15.0% by mass, and 1 to 10% by mass with respect to the total solid content of the image recording layer. Is more preferable.
- the image recording layer in the present invention is a coating solution prepared by dispersing or dissolving the necessary components in a known solvent as described in paragraphs [0142] to [0143] of JP-A-2008-195018, for example. This is prepared by coating the substrate by a known method such as bar coater coating and drying.
- the image recording layer coating amount (solid content) on the support obtained after coating and drying varies depending on the application, but is generally preferably 0.3 to 3.0 g / m 2 . Within this range, good sensitivity and good film characteristics of the image recording layer can be obtained.
- an undercoat layer (sometimes referred to as an intermediate layer) is preferably provided between the image recording layer and the support.
- the undercoat layer enhances the adhesion between the support and the image recording layer in the exposed area, and easily peels off the image recording layer from the support in the unexposed area. Contributes to improvement.
- the undercoat layer functions as a heat insulating layer, thereby preventing the heat generated by the exposure from diffusing to the support and reducing the sensitivity.
- an undercoat layer having a compound having an acid group such as phosphonic acid, phosphoric acid or sulfonic acid is preferably used.
- those having an adsorbing group capable of being adsorbed on the surface of the support and a crosslinkable group in order to improve adhesion to the image recording layer are preferable.
- These compounds may be low molecular weight or high molecular weight polymers. Moreover, you may use these compounds in mixture of 2 or more types as needed.
- a copolymer of a monomer having an adsorptive group, a monomer having a hydrophilic group, and a monomer having a crosslinkable group is preferable.
- the adsorptive group that can be adsorbed on the support surface include a phenolic hydroxy group, a carboxy group, —PO 3 H 2 , —OPO 3 H 2 , —CONHSO 2 —, —SO 2 NHSO 2 —, —COCH 2 COCH 3 Is preferred.
- a sulfo group is preferable.
- the crosslinkable group is preferably a methacryl group or an allyl group.
- This polymer may have a crosslinkable group introduced by salt formation between the polar substituent of the polymer, a substituent having a counter charge and a compound having an ethylenically unsaturated bond,
- Other monomers preferably hydrophilic monomers, may be further copolymerized.
- the phosphorus compound which has a heavy bond reactive group is mentioned suitably.
- crosslinkable groups described in JP-A-2005-238816, JP-A-2005-125649, JP-A-2006-239867, JP-A-2006-215263, and JP-A-2011-24584 (preferably an ethylenic group)
- Those containing a low molecular or high molecular compound having a saturated bonding group), a functional group that interacts with the support surface, and a hydrophilic group are also preferably used. More preferable examples include adsorptive groups, hydrophilic groups, and crosslinkable groups that can be adsorbed on the support surface described in JP-A Nos. 2005-12549, 2006-188038, and 2011-245846.
- the high molecular polymer which has is mentioned.
- the content of unsaturated double bonds in the polymer resin for the undercoat layer is preferably 0.1 to 10.0 mmol, most preferably 0.2 to 5.5 mmol per 1 g of the polymer.
- the polymer for the undercoat layer preferably has a mass average molar mass of 5000 or more, more preferably 10,000 to 300,000.
- the undercoat layer according to the present invention includes a chelating agent, a secondary or tertiary amine, a polymerization inhibitor, an amino group, or a functional group having a polymerization inhibitory ability, in addition to the above-mentioned undercoat layer compound, to prevent contamination over time.
- a compound having a group that interacts with the surface of an aluminum support for example, 1,4-diazabicyclo [2,2,2] octane (DABCO), 2,3,5,6-tetrahydroxy-p-quinone, Chloranil, sulfophthalic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, hydroxyethyliminodiacetic acid, etc.
- the undercoat layer is applied by a known method.
- 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 .
- the support used for the photosensitive lithographic printing plate precursor according to the invention a known support is used. Of these, an aluminum plate that has been roughened and anodized by a known method is preferred. In addition, the aluminum plate is subjected to micropore enlargement treatment or sealing treatment of an anodized film described in JP-A-2001-253181 or JP-A-2001-322365, and US Pat. 714,066, 3,181,461, 3,280,734 and 3,902,734, or alkali metal silicates as described in U.S. Pat. Surface hydrophilization treatment with polyvinylphosphonic acid or the like as described in each specification of 3,276,868, 4,153,461 and 4,689,272 is appropriately performed and performed. be able to.
- the support preferably has a center line average roughness of 0.10 to 1.2 ⁇ m.
- the support used in the lithographic printing plate precursor according to the present invention has an organic polymer compound described in JP-A No. 5-45885 on the back surface, if necessary, described in JP-A No. 6-35174.
- a backcoat layer containing a silicon alkoxy compound can be provided.
- the lithographic printing plate precursor used in the method of the present invention is preferably provided with a protective layer (overcoat layer) on the image recording layer.
- the protective layer has a function of preventing scratches in the image recording layer and preventing ablation during high-illuminance laser exposure.
- the protective layer in the lithographic printing plate precursor according to the invention can be formed of two or more layers.
- the protective layer may have a two-layer structure including an upper protective layer and a lower protective layer.
- the protective layer having such characteristics is described in, for example, US Pat. No. 3,458,311 and Japanese Patent Publication No. 55-49729.
- the low oxygen permeability polymer used for the protective layer either a water-soluble polymer or a water-insoluble polymer can be appropriately selected and used, and two or more types can be mixed and used as necessary. it can.
- Specific examples include polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble cellulose derivatives, poly (meth) acrylonitrile, and the like.
- modified polyvinyl alcohol acid-modified polyvinyl alcohol having a carboxy group or a sulfo group is preferably used.
- modified polyvinyl alcohols described in JP-A-2005-250216 and JP-A-2006-259137 are suitable.
- a hydrophilic polymer having at least a repeating unit represented by the following general formula (1) and a repeating unit represented by the following general formula (2) described in JP2012-73597A is used. be able to.
- it preferably contains a hydrophilic polymer having a repeating unit represented by the following general formula (1) and general formula (2) (hereinafter also referred to as a specific hydrophilic polymer (e)).
- R 1 and R 4 each independently represent a hydrogen atom or a methyl group.
- R 2 and R 3 each independently represents a hydrogen atom, a methyl group, or an ethyl group.
- R 5 represents a linear, branched or cyclic unsubstituted alkyl group having 2 to 8 carbon atoms, a substituted alkyl group which may have an aromatic ring or a heterocyclic ring as a substituent, or a group represented by the following general formula (3): Represents a substituent. Examples of the substituent that can be introduced into the substituted alkyl group include an aromatic ring group, a heterocyclic group, and a polyether group.
- L represents an alkylene group having 2 to 6 carbon atoms
- R 6 represents a linear, branched or cyclic unsubstituted alkyl group or aromatic substituted alkyl group having 4 to 8 carbon atoms.
- n is the average number of moles of polyether added and represents a number of 2 to 4. It is preferable that R 2 and R 3 of the repeating unit represented by the general formula (1) are both hydrogen atoms.
- R 5 of the repeating unit represented by the general formula (2) is preferably a linear, branched or cyclic unsubstituted alkyl group having 2 to 8 carbon atoms.
- R 1 and R 4 in the general formula (1) and the general formula (2) are both hydrogen atoms
- the general formula ( A combination in which R 2 and R 3 in 1) are both hydrogen atoms and R 5 in formula (2) is a branched and unsubstituted alkyl group having 4 carbon atoms is most preferable.
- the specific hydrophilic polymer (e) is preferably a hydrophilic polymer having a repeating unit represented by the following general formula (4).
- R 7 represents a hydrogen atom or a methyl group.
- X is a single bond, a divalent linking group selected from the structures shown in the following structural group (5), or a divalent linking group formed by combining a plurality selected from the structures shown in the following structural group (5). Represents.
- Y is a carboxylic acid group, a carboxylic acid group, a sulfonic acid group, a sulfonic acid group, a phosphoric acid group, a phosphoric acid group, a phosphonic acid group, a phosphonic acid group, a hydroxyl group, a carboxybetaine group, a sulfobetaine group, an ammonium group, or Represents a polyether group represented by the following general formula (6).
- Y is preferably a sulfonic acid group, a sulfonic acid group, a carboxybetaine group, a sulfobetaine group, or an ammonium group from the viewpoint of water solubility and on-press developability. More preferred are groups, sulfonate groups and sulfobetaine groups.
- X is preferably a linking group including any one of divalent linking chains selected from the structures shown in the following structural group (5) linking chain.
- L ′ represents an alkylene group having 2 to 3 carbon atoms
- R 8 represents a hydrogen atom or a methyl group
- n ′ is an average added mole number of the polyether and is a number of 2 to 4.
- the monomer derived from the repeating unit represented by the general formula (1) include acrylamide, methacrylamide, N-methyl acrylamide, N-methyl methacrylamide, N-ethyl acrylamide, N-ethyl methacrylamide, N , N-dimethylacrylamide, N, N-dimethylmethacrylamide, N, N-diethylacrylamide, N, N-diethylmethacrylamide, N, N-ethylmethylacrylamide, N, N-ethylmethylmethacrylamide.
- the monomer derived from the repeating unit represented by the general formula (2) include methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, i-butyl acrylate, T-butyl acrylate, pentyl acrylate, hexyl acrylate, cyclohexyl acrylate, heptyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, nonyl acrylate, decyl acrylate, 2- (2-ethylhexyloxyethoxy) ) Ethyl, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, pentyl methacrylate,
- the repeating unit represented by the general formula (1) preferably contains 65 to 96.7 mol%, more preferably 70 to 80 mol%, and particularly preferably 74 to 80 mol%.
- the repeating unit represented by the general formula (2) preferably contains 3 to 30 mol%, more preferably 20 to 30 mol%, particularly preferably 20 to 26 mol%.
- the monomer derived from the repeating unit represented by the general formula (4) include 2-acryloylamino-2-methyl-propanesulfonic acid, sodium 2-acryloylamino-2-methyl-propanesulfonate, -Potassium acryloylamino-2-methyl-propanesulfonate, 4-((3-methacrylamidopropyl) dimethylammonio) butane-1-sulfonate, 4-((3-acrylamidopropyl) dimethylammonio) butane-1- Sulfonate, vinyl alcohol, acrylic acid, methacrylic acid, sodium styrene sulfonate, diethylene glycol monomethyl ether methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, methacrylcholine chloride, 3-sulfomethacrylate Ropirukariumu, 2- phosphate (methacryloyloxy) ethyl, dimethyl -N
- the specific hydrophilic polymer (e) preferably contains 0.3 to 5 mol% of the repeating unit represented by the general formula (4), more preferably 0.3 to 3 mol%. Those containing 0.3 mol% to 1.5 mol% are more preferable.
- the hydrophilic polymer of the present invention used for the protective layer contains the repeating unit represented by the general formula (4) in the above preferred range, the photosensitive lithographic printing plate precursor used for the present invention has good on-machine performance. Developability, flaking property and printing durability are obtained.
- the weight average molecular weight (Mw) of the hydrophilic polymer of the present invention as converted to polystyrene by GPC method is preferably in the range of 10,000 to 200,000, and in the range of 10,000 to 100,000. Is more preferable, and the range of 10,000 to 30,000 is most preferable.
- hydrophilic polymer of the present invention Specific examples of the hydrophilic polymer of the present invention are shown below.
- the ratio of each repeating unit is described in terms of mole fraction, and the Mw of the hydrophilic polymer is 20,000.
- the content of the specific hydrophilic polymer (e) in the protective layer is preferably 40% by mass or more of the solid content of the protective layer. More preferably, it is 60 mass% or more, Most preferably, it is 80 mass% or more. Within this range, a lithographic printing plate having better inking properties and higher printing durability can be obtained, and a lithographic printing plate precursor excellent in on-press development can be obtained.
- the protective layer preferably contains an inorganic layered compound (also referred to as an inorganic layered compound) such as natural mica and synthetic mica as described in JP-A-2005-119273 in order to enhance oxygen barrier properties.
- the protective layer may contain a known additive such as a plasticizer for imparting flexibility, a surfactant for improving coating properties, inorganic fine particles for controlling surface slipperiness, and an ultraviolet absorber. it can. Further, the protective layer can contain the sensitizer described in the description of the image recording layer.
- adhesion to the image recording layer and scratch resistance are extremely important in handling the plate. That is, when a hydrophilic protective layer mainly composed of a water-soluble polymer is laminated on an oleophilic image recording layer, film peeling due to insufficient adhesive force is likely to occur, and the peeled portion may be poorly cured due to oxygen polymerization inhibition. Cause defects.
- various proposals have been made to improve the adhesion between these two layers. For example, in Japanese Patent Publication No. 54-12215 and British Patent Application No. 1303578, an acrylic emulsion or a water-insoluble vinylpyrrolidone-vinyl acetate copolymer is mixed in a protective layer in an amount of 20 to 60% by mass. Describes that sufficient adhesion can be obtained. Any of these known techniques can be applied to the protective layer in the present invention.
- the method of applying such a protective layer it is applied by a known method described in, for example, US Pat. No. 3,458,311 and JP-A-55-49729.
- the coating amount of the protective layer, the coating amount after drying is preferably in the range of 0.01 ⁇ 10g / m 2, more preferably in the range of 0.02 ⁇ 3g / m 2, and most preferably 0.
- the range is 02 to 1 g / m 2 .
- the plate making method of the lithographic printing plate of the present invention comprises at least a step of image-exposing a lithographic printing plate precursor (hereinafter also referred to as “exposure step”) and a step of developing with at least one of oil-based ink and aqueous component (hereinafter referred to as “exposure step”). , Also referred to as “development process”).
- the lithographic printing plate precursor used in the present invention is preferably exposed using a light source having a wavelength of 750 nm to 1400 nm.
- a light source having a wavelength of 750 nm to 1400 nm.
- a solid-state laser and a semiconductor laser emitting infrared rays are suitable, and a method of image exposure by scanning exposure with these infrared lasers is particularly preferred.
- the exposure mechanism may be any of an internal drum system, an external drum system, a flat bed system, and the like.
- the lithographic printing plate precursor used in the present invention is image-exposed and then attached to a printing machine (more specifically, a printing machine cylinder), and the unexposed portion of the image recording layer is formed of at least one of oil-based ink and aqueous component. It is preferable that development is performed by removal (on-press development).
- the on-press development method includes a step of image-exposing a lithographic printing plate precursor, and printing by supplying at least one of an oil-based ink and an aqueous component without performing any development treatment on the exposed lithographic printing plate precursor. And an unexposed portion of the planographic printing plate precursor is removed in the course of the printing step.
- Imagewise exposure may be performed on the printing machine after the lithographic printing plate precursor is mounted on the printing machine, or may be separately performed with a plate setter or the like. In the latter case, the exposed lithographic printing plate precursor is mounted on a printing machine without undergoing a development process.
- the on-press development process that is, the image recording layer in the unexposed area is removed at an early stage of printing. Accordingly, the surface of the hydrophilic support is exposed to form a non-image part.
- the oil-based ink and the aqueous component ordinary lithographic printing ink and fountain solution are used.
- dampening water or printing ink may be supplied to the printing plate first, but printing is first performed in order to prevent the dampening water from being contaminated by the removed image recording layer components. It is preferable to supply ink.
- the lithographic printing plate precursor according to the invention is developed on the machine on an offset printing machine and used as it is for printing a large number of sheets.
- the development process can be performed with an aqueous solution containing a surfactant by using an automatic developing machine.
- This aqueous solution may contain a water-soluble resin.
- the entire surface may be heated before exposure, during exposure, and between exposure and development, if necessary.
- 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.
- the 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 unexposed area 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 strengthening action cannot be obtained. If the temperature is too high, problems such as deterioration of the support and thermal decomposition of the image area occur.
- the molecular weight is a mass average molar mass (Mw) in terms of polystyrene converted by the GPC method, and the ratio of repeating units is a mole percentage.
- 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 20 mass% nitric acid at 60 ° C for 20 seconds, and washed with water. At this time, the etching amount of the grained surface 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 nitric acid aqueous solution (containing 0.5% by mass of aluminum ions) and a liquid temperature of 50 ° C.
- the AC power source waveform is electrochemical roughening treatment using a trapezoidal rectangular wave alternating current with a time ratio 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 alternating current. 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. under the condition of an electric quantity of 50 C / dm 2 when the aluminum plate was the anode.
- an electrochemical surface roughening treatment was performed, followed by washing with water by spraying.
- the plate was provided with a direct current anodic oxide film having a current density of 15 A / dm 2 and a current density of 15 g / m 2 using 15% by mass sulfuric acid (containing 0.5% by mass of aluminum ions) as an electrolytic solution, followed by washing with water.
- the support body (1) It dried and produced the support body (1). Thereafter, in order to ensure the hydrophilicity of the non-image area, the support (1) was subjected to a silicate treatment at 60 ° C. for 10 seconds using an aqueous 2.5 mass% No. 3 sodium silicate solution, and then washed with water for support. Body (2) was obtained. The adhesion amount of Si was 10 mg / m 2 . The centerline average roughness (Ra) of this substrate was measured using a needle having a diameter of 2 ⁇ m and found to be 0.51 ⁇ m.
- undercoat layer coating solution (1) is applied onto the support (2) so that the dry coating amount is 20 mg / m 2 , and used in the following experiments.
- a support having a layer was prepared.
- aqueous phase component 40 g of a 4% by mass aqueous solution of polyvinyl alcohol (PVA-205 manufactured by Kuraray Co., Ltd.) was prepared.
- the oil phase component and the aqueous phase component were mixed and emulsified for 10 minutes at 12,000 rpm using a homogenizer.
- the obtained emulsion was added to 25 g of distilled water, stirred at room temperature for 30 minutes, and then stirred at 50 ° C. for 3 hours.
- the solid content concentration of the microgel solution thus obtained was diluted with distilled water so as to be 15% by mass, and this was used as the microgel.
- the average particle size of the microgel was measured by a light scattering method, the average particle size was 0.2 ⁇ m.
- a protective layer coating solution (1) having the following composition was further bar-coated on the image recording layer of the lithographic printing plate precursor, followed by oven drying at 120 ° C. for 60 seconds to provide a dry coating amount of 0.15 g / m 2 . Layers were formed to prepare lithographic printing plate precursors of Examples 1 to 5.
- Comparative Example 1 A lithographic printing plate precursor of Comparative Example 1 was obtained in the same manner as in Example 1 except that the same amount of ethyl cellulose listed in Table 1 was used instead of sulfonic acid-modified cellulose.
- Comparative Example 2 A lithographic printing plate precursor of Comparative Example 2 was obtained in the same manner as in Example 1 except that 0.30 g of sulfonic acid-modified cellulose was replaced with 0.30 g of the binder polymer (1).
- Example 6 to 18 The following photosensitive solution (2) is applied to the support (2) according to the method described in the formation of the image recording layer in Example 1, and has an image recording layer having a dry coating amount of 1.0 g / m 2.
- the planographic printing plate precursors of Examples 6 to 18 were obtained.
- the particle size distribution of the polymer fine particles had a maximum value at a particle size of 150 nm.
- the particle size distribution is obtained by taking an electron micrograph of polymer fine particles, measuring a total of 5000 fine particle sizes on the photograph, and a logarithmic scale between 0 and the maximum value of the obtained particle size measurement values. And the frequency of appearance of each particle size was plotted and obtained.
- the particle size of spherical particles having the same particle area as that on the photograph was used as the particle size.
- Example 19 Example except that the sulfonated polysaccharide described in Table 1 (see below for the structure; in the following formula, n indicates the number of repeating units in parentheses) is used instead of the sulfonic acid-modified cellulose. 6 and lithographic printing plate precursors of Examples 19 and 20 were obtained.
- Comparative Example 3 A lithographic printing plate precursor of Comparative Example 3 was obtained in the same manner as in Example 6 except that the above-mentioned ELVACITE 4026 having the same mass as the solid content was used instead of the sulfonic acid-modified cellulose.
- Comparative Examples 4 to 7 The lithographic printing plate precursors of Comparative Examples 4 to 7 were obtained in the same manner as in Example 6 except that the polysaccharides listed in Table 1 were used instead of the sulfonic acid-modified cellulose.
- Examples 1 to 20 using polysaccharides having a sulfonic acid group or a salt thereof are more resistant to lithographic printing plates after development than Comparative Examples 1 to 7 not using them. It was found that good on-press developability was obtained while maintaining the printability.
- a lithographic printing plate precursor capable of obtaining good developability while maintaining the printing durability of the lithographic printing plate after development, and a lithographic printing plate making method using the same.
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Abstract
Description
この平版印刷版を作製するため、従来は、親水性の支持体上に親油性の感光性樹脂層(画像記録層)を設けてなる平版印刷版原版(PS版)を用い、PS版にリスフィルムなどのマスクを通した露光を行った後、アルカリ性現像液などによる現像処理を行い、画像部に対応する画像記録層を残存させ、非画像部に対応する不要な画像記録層を溶解除去して、平版印刷版を得ていた。
また、簡易現像の方法としては、画像記録層の不要部分の除去を、従来の高アルカリ性現像液ではなく、pHが中性に近いフィニッシャー又はガム液によって行う「ガム現像」と呼ばれる方法も行われている。
本発明は、上記を鑑みてなされたものであり、その目的は、現像後における平版印刷版の耐刷性を維持させたまま、良好な現像性が得られる平版印刷版原版及びこれを用いた平版印刷版の製版方法を提供することにある。
〔1〕 支持体上に、画像露光後に印刷機上で印刷インキ及び湿し水の少なくともいずれかを供給して未露光部を除去することにより画像形成可能な画像記録層を有する平版印刷版原版であって、前記画像記録層が、赤外線吸収剤、重合開始剤、重合性化合物、及び、スルホン酸基又はその塩よりなる基を有する多糖類を含有する、平版印刷版原版。
〔2〕 上記スルホン酸基又はその塩よりなる基を有する多糖類が、下記一般式(A)で表される構造を有する、上記〔1〕に記載の平版印刷版原版。
-O-L-SO3 -X+ 一般式(A)
ここでLは、エチレン基又はプロピレン基を表し、X+は水素イオン、アルカリ金属イオン又はアンモニウムイオンを表す。
〔3〕 上記多糖類が、スルホン酸基又はその塩よりなる基を有するセルロースである、上記〔1〕又は〔2〕に記載の平版印刷版原版。
〔4〕 多糖類が、下記一般式(1)で表される繰り返し単位を有するスルホン酸基又はその塩よりなる基を有するセルロースである、上記〔2〕に記載の平版印刷版原版。
ここで、Rは、各々独立に、水素原子、アルキル基、ヒドロキシアルキル基、カルボキシアルキル基、又は、-L-SO3 -X+を表す。nは2以上の整数を表す。L及びX+は、それぞれ、上記一般式(A)におけるL及びX+と同義である。
ただし、上記一般式(1)で表される繰り返し単位における3個のRのうち、-L-SO3 -X+を表すRの個数(置換度)は0.3~2.5である。
〔5〕 上記〔1〕~〔4〕のいずれか1項に記載の平版印刷版原版を、画像様露光した後に印刷機に装着し、印刷インキ及び湿し水の少なくともいずれかを供給する方法、又は、印刷機に装着した後に画像様露光した後、印刷インキ及び湿し水の少なくともいずれかを供給する方法によって機上現像処理を行う平版印刷版の製版方法。
本発明の平版印刷版原版は、支持体上に、赤外線吸収剤、重合開始剤、重合性化合物、及び、スルホン酸基又はその塩よりなる基を有する多糖類を含有し、印刷インキ及び湿し水の少なくともいずれかにより除去可能な画像記録層を有している。
画像記録層がスルホン酸基又はその塩よりなる基を有する多糖類を含有することにより、親水性が高まり、未露光部(非画像部に相当)の湿し水の浸透性が向上し、非画像部の除去性が向上すると推定される。一方、露光部は架橋されているため湿し水の浸透は起こりにくく、スルホン酸基又はその塩よりなる基を有する多糖類という高分子量の素材が膜中に含有することで、露光部の耐磨耗性を維持することができ、耐刷性が維持されると推定される。
本発明の平版印刷版原版は、支持体上に、画像露光後に印刷機上で印刷インキ及び湿し水の少なくともいずれかを供給して未露光部を除去することにより画像形成可能な画像記録層を有する平版印刷版原版であって、前記画像記録層が、赤外線吸収剤、重合開始剤、重合性化合物、及び、スルホン酸基又はその塩よりなる基を有する多糖類を含有する。
また、本発明の平版印刷版原版は、必要に応じて、支持体と画像記録層の間に下塗り層を、また、画像記録層の上に保護層を設けることができる。
以下、本発明の平版印刷版原版の構成要素について説明する。
本発明の平版印刷版原版における画像記録層は、赤外線吸収剤、重合開始剤、重合性化合物、及び、スルホン酸基又はその塩よりなる基を有する多糖類を含有している。
重合性組成物に用いる赤外線吸収剤は、画像露光時の光を吸収して励起状態となり、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、750~1400nmの波長域に極大吸収を有する赤外線吸収剤が好ましく用いられる。赤外線吸収剤は染料又は顔料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(IV)で示されるシアニン色素が挙げられる。
本発明に用いられる重合開始剤としては、重合性化合物の重合を開始、促進する化合物を示す。本発明において使用しうる重合開始剤としては、ラジカル重合開始剤が好ましく、公知の熱重合開始剤、結合解離エネルギーの小さな結合を有する化合物、光重合開始剤などを使用することができる。
本発明における重合開始剤としては、例えば、(a)有機ハロゲン化物、(b)カルボニル化合物、(c)アゾ化合物、(d)有機過酸化物、(e)メタロセン化合物、(f)アジド化合物、(g)ヘキサアリールビイミダゾール化合物、(h)有機ホウ酸塩化合物、(i)ジスルホン化合物、(j)オキシムエステル化合物、(k)オニウム塩化合物、が挙げられる。
本発明における画像記録層に用いる重合性化合物には、特に制限はない。上記重合性化合物のうち、少なくとも一個のエチレン性不飽和二重結合を有する重合性化合物が好ましく、末端エチレン性不飽和結合を少なくとも1個有する重合性化合物がより好ましく、末端エチレン性不飽和結合を少なくとも2個以上有する重合性化合物が特に好ましい。上記好ましい重合性化合物は、例えばモノマー、プレポリマー、すなわち2量体、3量体及びオリゴマー、又はそれらの混合物などの化学的形態をもつ。
CH2=C(R4)COOCH2CH(R5)OH (A)
(ただし、R4及びR5はそれぞれ独立に、H又はCH3を示す。)
また、特開昭51-37193号公報、特公平2-32293号公報、特公平2-16765号公報、特開2003-344997号公報、特開2006-65210号公報に記載されているようなウレタンアクリレート類や、特公昭58-49860号公報、特公昭56-17654号公報、特公昭62-39417号公報、特公昭62-39418号公報、特開2000-250211号公報、特開2007-94138号公報記載のエチレンオキサイド系骨格を有するウレタン化合物類や、US7153632号公報、特表平8-505958号公報、特開2007-293221号公報、特開2007-293223号公報記載の親水基を有するウレタン化合物類も好適である。
上記の中でも、機上現像性に関与する親水性と耐刷性に関与する重合能のバランスに優れる点から、トリス(アクリロイルオキシエチル)イソシアヌレート、ビス(アクリロイルオキシエチル)ヒドロキシエチルイソシアヌレートなどのイソシアヌル酸エチレンオキシド変性アクリレート類が特に好ましい。
スルホン酸基又はその塩よりなる基を有する多糖類は、下記一般式(A)で表される構造を有するものであることが好ましい。-O-L-SO3 -X+ 一般式(A)
ここでLは、エチレン基又はプロピレン基を表し、X+は水素イオン、アルカリ金属イオン又はアンモニウムイオンを表す。
スルホン酸基又はその塩よりなる基を有する多糖類における、多糖類の骨格の例としては、グルコースを単位糖とするデキストリン、デンプン、セルロース、グルカン、又はグリコーゲンプルランなど;フルクトースを単位糖とするイヌリン、レバン、又はフルクトオリゴ糖など;N-アセチルグルコサミンを単位糖とするキチンなど;ガラクトースを単位糖とするガルクトオリゴ糖など;マンノースを単位糖するマンナンオリゴ糖などが挙げられる。また、上記多糖類は、二種以上の単位糖から構成される多糖類であってもよく、そのような多糖類の骨格の例としては、ラフィノース、スタキオース(ガラクトース/フルクトース/グルコース)などが挙げられる。中でも好ましくは、デキストリン、デンプン、セルロース、グルカン、又はグリコーゲンプルランで、特に好ましくは、セルロースである。
ただし、上記一般式(1)で表される繰り返し単位における3個のRのうち、-L-SO3 -X+を表すRの個数(置換度)は0.3~2.5である。
本明細書において「置換度」とは、多糖類の一単糖(すなわち、上記繰り返し単位に相当)当りにおいて、水酸基の水素原子が修飾された置換基の平均数を意味し、例えば、セルロースの全ての水酸基の水素原子が修飾された場合は、置換度は3となる。
-L-SO3 -X+を表すRの個数(置換度)は、0.35~2であることがより好ましく、0.4~1.2であることが更に好ましい。
nは6~3000であることが好ましい。
Rとしてのヒドロキシアルキル基としては、ヒドロキシプロピル基、及び、ヒドロキシエチル基などを挙げることができる。
Rとしてのカルボキシアルキル基としては、カルボキシメチル基などを挙げることができる。
スルホン酸基又はその塩よりなる基を有する多糖類の合成方法としては、特開平9-227601号公報等に記載のセルロースのスルホン化に準じた方法や、その他にも、セルロース等の多糖類と、ビニルスルホン酸あるいはその金属塩、β-クロロエタンスルホン酸あるいはその金属塩、ブタンサルトン、プロパンサルトン等のスルホアルキル化剤とを反応させる方法も挙げられる。
母核となる多糖類と反応させるスルホン酸基又はその塩よりなる基を有する付加物の構造としては、一方の末端にスルホン酸基又はその塩よりなる基を有し、他方の末端にハロゲン原子(F,Cl,Br,Iなど)を有する化合物であることが好ましく、下記式(I)で表される化合物であることがより好ましい。
nは、2又は3であることが好ましい。
本発明において、質量平均分子量は、GPC(Gel Permeation Chromatography)を用いて通常の方法で測定することができる。
本発明における画像記録層は、皮膜性を付与するため、通常、バインダーポリマーを含有する。本発明に用いることができるバインダーポリマーは、皮膜性を付与できるものなら、従来公知のものを制限なく使用できる。直鎖状のバインダーポリマーであっても、特開2007-249036に記載されているような星型ポリマー構造であってもよい。例えば、平版印刷版原版用として以下に記載の付加重合体及び側鎖に架橋性基を有するウレタン樹脂を好ましいものとして挙げることができる。
このような画像記録層に含有され得るバインダーポリマーとしてはアルキレンオキサイド基を有するバインダーポリマーが好ましい。
本発明における平版印刷版原版の画像記録層に用いられるアルキレンオキサイド基を有するバインダーポリマーは、ポリ(アルキレンオキサイド)部位を主鎖に有していても、側鎖に有していてもよく、ポリ(アルキレンオキサイド)を側鎖に有するグラフトポリマーでも、ポリ(アルキレンオキサイド)含有繰返し単位で構成されるブロックと、(アルキレンオキサイド)非含有繰返し単位で構成されるブロックとのブロックコポリマーでもよい。
主鎖に有する場合にはポリウレタン樹脂が好ましい。側鎖に有する場合の主鎖のポリマーとしては、アクリル樹脂、ポリビニルアセタール樹脂、ポリウレタン樹脂、ポリウレア樹脂、ポリイミド樹脂、ポリアミド樹脂、エポキシ樹脂、メタクリル樹脂、ポリスチレン系樹脂、ノボラック型フェノール系樹脂、ポリエステル樹脂、合成ゴム、天然ゴムが挙げられるが、特にアクリル樹脂が好ましい。
ポリ(アルキレンオキサイド)部位におけるアルキレンオキサイドの繰返し数は2~120であり、2~70の範囲が好ましく、2~50の範囲がより好ましい。
アルキレンオキサイドの繰り返し数が120以下であれば摩耗による耐刷性、インキ受容性による耐刷性の両方が低下することがなく、好ましい。
上記の中でも、R1は水素原子又はメチル基が好ましく、水素原子が最も好ましい。R2は水素原子又はメチル基が最も好ましい。
分子の主鎖中にエチレン性不飽和結合を有するポリマーの例としては、ポリ-1,4-ブタジエン、ポリ-1,4-イソプレンなどが挙げられる。
分子の側鎖中にエチレン性不飽和結合を有するポリマーの例としては、アクリル酸又はメタクリル酸のエステル又はアミドのポリマーであって、エステル又はアミドの残基(-COOR又はCONHRのR)がエチレン性不飽和結合を有するポリマーを挙げることができる。
アミド残基の具体例としては、-CH2CH=CH2、-CH2CH2-Y(式中、Yはシクロヘキセン残基を表す。)、-CH2CH2-OCO-CH=CH2が挙げられる。
なお、下記例示化合物中、各繰り返し単位に併記される数値(主鎖繰り返し単位に併記される数値)は、当該繰り返し単位のモル百分率を表す。側鎖の繰り返し単位に併記される数値は、当該繰り返し部位の繰り返し数を示す。
本発明における画像記録層は、現像性を向上させるため、ポリマー微粒子を含有できる。特に、ポリアルキレンオキシド構造を有するポリマー微粒子が好ましい。なかでも側鎖にポリアルキレンオキシド基を有するポリマー微粒子が好ましい。
これらにより、湿し水の浸透性が向上し、現像性が良好となる。ポリアルキレンオキシド構造としては、炭素数2又は3のアルキレンオキシド単位を2~120個有するアルキレンオキシド構造が好ましく、エチレンオキシド単位を2~120個有するポリエチレンオキシド構造がより好ましい。特にエチレンオキシド単位を20~100個有するポリエチレンオキシド構造が好ましい。このようなポリアルキレンオキシド構造を有するポリマー微粒子によって、耐刷性と現像性を両立することができる。また、着肉性を向上させることができる。
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又はメタクリレートなどのモノマーのホモポリマー若しくはコポリマー又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、スチレン及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。
本発明の画像記録層には、必要に応じて、更に下記の成分を含有することができる。
本発明における画像記録層は、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。
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又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。
これらの化合物は単独で用いてもよく、2種以上を混合して用いてもよい。
本発明の画像記録層には、着肉性を向上させるために、画像記録層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用いることができる。特に、保護層に無機質の層状化合物を含有させる場合、これらの化合物は、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。
ポリマー固形分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した。この溶液を30℃の恒温槽で30分間静置し、ウベローデ還元比粘度管(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)を算出した。
(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 Mw4.5万)(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 Mw6.0万)(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 Mw4.5万)(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 Mw6.0万)(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 Mw7.0万)(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 Mw6.5万)(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 Mw6.5万)(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 Mw7.5万)(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 Mw6.5万)
更にその他の成分として、界面活性剤、着色剤、焼き出し剤、重合禁止剤、高級脂肪酸誘導体、可塑剤、無機微粒子、無機質層状化合物、及び増感助剤若しくは連鎖移動剤などを添加することができる。具体的には、特開2008-284817号公報の段落番号[0114]~[0159]、特開2006-091479号公報の段落番号[0023]~[0027]、米国特許公開2008/0311520号明細書の段落番号[0060]に記載の化合物及び添加量が好ましい。
本発明における画像記録層は、例えば、特開2008-195018号公報の段落番号[0142]~[0143]に記載のように、必要な上記各成分を公知の溶剤に分散又は溶解して塗布液を調製し、これを支持体上にバーコーター塗布など公知の方法で塗布し、乾燥することで形成される。塗布、乾燥後に得られる支持体上の画像記録層塗布量(固形分)は、用途によって異なるが、一般的に0.3~3.0g/m2が好ましい。この範囲で、良好な感度と画像記録層の良好な皮膜特性が得られる。
本発明の平版印刷版原版は、画像記録層と支持体との間に下塗り層(中間層と呼ばれることもある)を設けることが好ましい。下塗り層は、露光部においては支持体と画像記録層との密着を強化し、未露光部においては画像記録層の支持体からの剥離を生じやすくさせるため、耐刷性を損なわず現像性を向上させるのに寄与する。また、赤外線レーザー露光の場合は、下塗り層が断熱層として機能することにより、露光により発生した熱が支持体に拡散して感度が低下するのを防ぐ。
具体的には、特開平10-282679号公報に記載されている付加重合可能なエチレン性二重結合反応基を有しているシランカップリング剤、特開平2-304441号公報記載のエチレン性二重結合反応基を有しているリン化合物が好適に挙げられる。特開2005-238816号、特開2005-125749号、特開2006-239867号、特開2006-215263号、及び特開2011-245846号の各公報記載の架橋性基(好ましくは、エチレン性不飽和結合基)、支持体表面に相互作用する官能基、及び親水性基を有する低分子又は高分子化合物を含有するものも好ましく用いられる。より好ましいものとして、特開2005-125749号、特開2006-188038号、及び特開2011-245846号公報に記載の支持体表面に吸着可能な吸着性基、親水性基、及び架橋性基を有する高分子ポリマーが挙げられる。
下塗り層用の高分子ポリマーは、質量平均モル質量が5000以上であるのが好ましく、1万~30万であるのがより好ましい。
本発明に係る感光性平版印刷版原版に用いられる支持体としては、公知の支持体が用いられる。なかでも、公知の方法で粗面化処理され、陽極酸化処理されたアルミニウム板が好ましい。
また、上記アルミニウム板は必要に応じて、特開2001-253181号公報や特開2001-322365号公報に記載されている陽極酸化皮膜のマイクロポアの拡大処理や封孔処理、及び米国特許第2,714,066号、同第3,181,461号、同第3,280,734号及び同第3,902,734号の各明細書に記載されているようなアルカリ金属シリケートあるいは米国特許第3,276,868号、同第4,153,461号及び同第4,689,272号の各明細書に記載されているようなポリビニルホスホン酸などによる表面親水化処理を適宜選択して行うことができる。
支持体は、中心線平均粗さが0.10~1.2μmであるのが好ましい。
本発明の方法に用いられる平版印刷版原版は、画像記録層の上に保護層(オーバーコート層)を設けることが好ましい。保護層は酸素遮断によって画像形成阻害反応を抑制する機能の他、画像記録層における傷の発生防止、及び高照度レーザー露光時のアブレーション防止の機能を有する。
本発明の平版印刷版原版における保護層は、2層以上により形成することもできる。例えば、保護層を上部保護層と下部保護層との2層構成にしてもよい。
変性ポリビニルアルコールとしては、カルボキシ基又はスルホ基を有する酸変性ポリビニルアルコールが好ましく用いられる。具体的には、特開2005-250216号、特開2006-259137号の公報に記載の変性ポリビニルアルコールが好適である。
保護層は、特開2012-73597号公報に記載されている少なくとも下記一般式(1)で表される繰り返し単位と下記一般式(2)で表される繰り返し単位を有する親水性ポリマーを使用することができる。
特に下記一般式(1)、及び一般式(2)で表される繰り返し単位を有する親水性ポリマー(以下、特定親水性ポリマー(e)とも称する)を含有していることが好ましい。
なお、置換アルキル基に導入可能な置換基としては、芳香族環基、複素環基及びポリエーテル基などが挙げられる。
一般式(1)で表される繰り返し単位のR2とR3は共に水素原子であることが好ましい。一般式(2)で表される繰り返し単位のR5が炭素原子数2~8の直鎖、分岐若しくは環状の無置換アルキル基であることが好ましい。
一般式(1)及び一般式(2)の各式で表される繰り返し単位の組み合わせとしては、一般式(1)及び一般式(2)のR1とR4が共に水素原子、一般式(1)のR2とR3が共に水素原子、一般式(2)のR5が炭素原子数4の分岐かつ無置換アルキル基である組み合わせが最も好ましい。
一般式(4)で表される繰り返し単位としては、水溶性及び機上現像性の観点から、Yはスルホン酸基、スルホン酸塩基、カルボキシベタイン基、スルホベタイン基、アンモニウム基が好ましく、スルホン酸基、スルホン酸塩基及びスルホベタイン基がより好ましい。
また、Xとしては下記構造群(5)連結鎖に示す構造から選ばれる二価の連結鎖であるのいずれかを含む連結基であることが好ましい。
保護層に用いられる本発明の親水性ポリマーが一般式(4)で表される繰り返し単位を上記好ましい範囲で含有することで、本発明に用いられる感光性平版印刷版原版は、良好な機上現像性、着肉性及び耐刷性が得られる。
また、保護層には、可撓性付与のための可塑剤、塗布性を向上させための界面活性剤、表面の滑り性を制御する無機微粒子、紫外線吸収剤など公知の添加物を含むことができる。また、画像記録層の説明に記載した感脂化剤を保護層に含有させることもできる。
このようにして、本発明の方法に適用される感光性平版印刷版原版を得る。
本発明の平版印刷版の製版方法は、少なくとも平版印刷版原版を画像露光する工程(以下、「露光工程」ともいう。)、及び、油性インキ及び水性成分の少なくとも一方により現像処理する工程(以下、「現像工程」ともいう。)を含む。
本発明に用いられる平版印刷版原版は、750nmから1400nmの波長の光源を用いて露光されることが好ましい。このような光源としては、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り、特にこれら赤外線レーザーにより走査露光することにより、画像露光する方法が好ましい。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。
本発明に用いられる平版印刷版原版は、画像露光した後、印刷機(より具体的には、印刷機シリンダー)に取り付けられ、画像記録層の未露光部が油性インキ及び水性成分の少なくとも一方により除去されることによって現像される(機上現像)ことが好ましい。
ここで、最初に版面に供給されるのは、湿し水でもよく、印刷インキでもよいが、湿し水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、最初に印刷インキを供給するのが好ましい。
このようにして、本発明の平版印刷版原版はオフセット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。
処方:セルロース10.0g、水酸化ナトリウム1.2g、及び、N-エチルピロリドン35.5gを攪拌装置及び冷却菅を備えたフラスコに入れ、内温90℃にした。その後、ブタンサルトン4.0gを温度上昇に注意しながら滴下し、滴下後90℃で12時間撹拌させながら反応させることにより、下表1に記載の、実施例1において使用される変性セルロースを合成した。
同様の手法により、他の例に使用される変性セルロースを合成した。
1.平版印刷版原版の作製
(1)支持体の作製
厚み0.3mmのアルミニウム板(材質JIS A 1050)の表面の圧延油を除去するため、10質量%アルミン酸ソーダ水溶液を用いて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、更に60℃で20質量%硝酸に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。
次に、この板に15質量%硫酸(アルミニウムイオンを0.5質量%含む)を電解液として電流密度15A/dm2で2.5g/m2の直流陽極酸化皮膜を設けた後、水洗、乾燥して支持体(1)を作製した。
その後、非画像部の親水性を確保するため、支持体(1)に2.5質量%3号ケイ酸ソーダ水溶液を用いて60℃で10秒間、シリケート処理を施し、その後、水洗して支持体(2)を得た。Siの付着量は10mg/m2であった。この基板の中心線平均粗さ(Ra)を直径2μmの針を用いて測定したところ、0.51μmであった。
次に、上記支持体(2)上に、下記下塗り層用塗布液(1)を乾燥塗布量が20mg/m2になるよう塗布して、以下の実験に用いる下塗り層を有する支持体を作製した。
・下記構造の下塗り層用化合物(1) 0.18g
・ヒドロキシエチルイミノ二酢酸 0.10g
・メタノール 55.24g
・水 6.15g
上記のようにして形成された下塗り層上に、下記組成の画像記録層塗布液(1)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(1)は、下記感光液(1)及びミクロゲル液(1)を塗布直前に混合し攪拌することにより得た。
・バインダーポリマー(1)〔下記構造〕 0.240g
・赤外線吸収剤(1)〔下記構造〕 0.030g
・ラジカル発生剤(1)〔下記構造〕 0.162g
・重合性化合物
トリス(アクリロイルオキシエチル)イソシアヌレート
(NKエステルA-9300、新中村化学(株)製) 0.192g
・低分子親水性化合物
トリス(2-ヒドロキシエチル)イソシアヌレート 0.062g
・低分子親水性化合物(1)〔下記構造〕 0.050g
・感脂化剤 ホスホニウム化合物(1)〔下記構造〕 0.055g
・感脂化剤
ベンジル-ジメチル-オクチルアンモニウム・PF6塩 0.018g
・感脂化剤 アンモニウム基含有ポリマー
[下記構造、還元比粘度44cSt/g/ml] 0.035g
・フッ素系界面活性剤(1)〔下記構造〕 0.008g
・2-ブタノン 1.091g
・1-メトキシ-2-プロパノール 8.609g
・有機ボレート(A)〔下記構造〕 0.25g
・表1に記載のスルホン酸変性セルロース 0.30g
・ミクロゲル(1) 2.640g
・蒸留水 2.425g
油相成分として、トリメチロールプロパンとキシレンジイソシアナート付加体(三井化学(株)製、タケネートD-110N)10g、ペンタエリスリトールトリアクリレート(日本化薬(株)製、SR444)3.15g、及びアルキルベンゼンスルホン酸塩(竹本油脂(株)製、パイオニンA-41C)0.1gを酢酸エチル17gに溶解した。水相成分としてポリビニルアルコール((株)クラレ製PVA-205)の4質量%水溶液40gを調製した。油相成分及び水相成分を混合し、ホモジナイザーを用いて12,000rpmで10分間乳化した。得られた乳化物を、蒸留水25gに添加し、室温で30分攪拌後、50℃で3時間攪拌した。このようにして得られたミクロゲル液の固形分濃度を、15質量%になるように蒸留水を用いて希釈し、これを上記ミクロゲルとした。ミクロゲルの平均粒径を光散乱法により測定したところ、平均粒径は0.2μmであった。
平版印刷版原版の画像記録層の上に、更に下記組成の保護層塗布液(1)をバー塗布した後、120℃で60秒間、オーブン乾燥し、乾燥塗布量0.15g/m2の保護層を形成して実施例1~5の平版印刷版原版を作製した。
・無機質層状化合物分散液(1) 1.5g
・ポリビニルアルコール(日本合成化学工業(株)製CKS50、スルホン酸変性、
けん化度99モル%以上、重合度300)6質量%水溶液 0.55g
・ポリビニルアルコール((株)クラレ製PVA-405、
けん化度81.5モル%、重合度500)6質量%水溶液 0.03g
・日本エマルジョン(株)製界面活性剤
(エマレックス710)1質量%水溶液 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、ホモジナイザーを用いて平均粒径(レーザー散乱法)が3μmになるまで分散した。得られた分散粒子のアスペクト比は100以上であった。
スルホン酸変性セルロースの代わりに、表1に記載のエチルセルロースを同質量使用する以外は、実施例1と同様に作製することにより、比較例1の平版印刷版原版を得た。
0.30gのスルホン酸変性セルロースを0.30gの上記バインダーポリマー(1)に置き換えた以外は、実施例1と同様に作製することにより、比較例2の平版印刷版原版を得た。
上記支持体(2)に下記感光液(2)を、実施例1における上記画像記録層の形成で記載した方法に準じて塗布し、乾燥塗布量1.0g/m2の画像記録層を有する、実施例6~18の平版印刷版原版を得た。
・ポリマー微粒子水分散液(1) 20.0g
・赤外線吸収剤(2)[下記構造] 0.2g
・ラジカル発生剤 IRGACURE250 (BASF社製)0.5g
・表1に記載のスルホン酸変性セルロース 0.3g
・有機ボレート(A)[上記構造] 0.25g
・重合性化合物 SR-399(サートマー社製) 1.50g
・メルカプト-3-トリアゾール 0.2g
・BYK336(Byk Chimie社製) 0.4g
・ELVACITE4026(Ineos Acrylica社製)
2.5g
・n-プロパノール 55.0g
・2-ブタノン 17.0g
・IRGACURE 250:(4-メトキシフェニル)[4-(2-メチルプロピル)フェニル]ヨードニウム=ヘキサフルオロホスファート(75質量%プロピレンカーボナート溶液)
・SR-399:ジペンタエリスリトールペンタアクリレート
・BYK 336:変性ジメチルポリシロキサン共重合体(25質量%キシレン/メトキシプロピルアセテート溶液)
・ELVACITE 4026:高分岐ポリメチルメタクリレート(10質量%2-ブタノン溶液)
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、ポリエチレングリコールメチルエーテルメタクリレート(PEGMA エチレングリコールの平均の繰返し単位は50)10g、蒸留水200g及びn-プロパノール200gを加えて内温が70℃となるまで加熱した。次に予め混合されたスチレン(St)10g、アクリロニトリル(AN)80g及び2,2’-アゾビスイソブチロニトリル0.8gの混合物を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、2,2’-アゾビスイソブチロニトリル0.4gを添加し、内温を80℃まで上昇させた。続いて、0.5gの2,2’-アゾビスイソブチロニトリルを6時間かけて添加した。合計で20時間反応させた段階でポリマー化は98%以上進行しており、質量比でPEGMA/St/AN=10/10/80のポリマー微粒子水分散液(1)が得られた。このポリマー微粒子の粒径分布は、粒子径150nmに極大値を有していた。
スルホン酸変性セルロースの代わりに、表1に記載のスルホン化多糖類(構造は下記参照;下記式において、nは、カッコ内の繰り返し単位の繰り返し数を示す)を使用すること以外は、実施例6と同様に作製し、実施例19,20の平版印刷版原版をそれぞれ得た。
スルホン酸変性セルロースの代わりに、固形分で同質量の上記したELVACITE 4026を使用した以外は、実施例6と同様に作製し、比較例3の平版印刷版原版を得た。
スルホン酸変性セルロースの代わりに、表1に記載の多糖類を使用した以外は、実施例6と同様に作製し、比較例4~7の平版印刷版原版をそれぞれ得た。
(i)機上現像性
得られた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及び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。
得られた露光済み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)の湿し水とスペースカラーフュージョンG(N)墨インキ(DICグラフィックス(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、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。
画像記録層の未露光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。
上述した塗布直後の機上現像性の評価を行った後、更に印刷を続けた。印刷枚数を増やしていくと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。
本発明によれば、現像後における平版印刷版の耐刷性を維持させたまま、良好な現像性が得られる平版印刷版原版及びこれを用いた平版印刷版の製版方法を提供できる。
本出願は、2012年09月26日出願の日本特許出願(特願2012-213071)に基づくものであり、その内容はここに参照として取り込まれる。
Claims (5)
- 支持体上に、画像露光後に印刷機上で印刷インキ及び湿し水の少なくともいずれかを供給して未露光部を除去することにより画像形成可能な画像記録層を有する平版印刷版原版であって、前記画像記録層が、赤外線吸収剤、重合開始剤、重合性化合物、及び、スルホン酸基又はその塩よりなる基を有する多糖類を含有する、平版印刷版原版。
- 上記スルホン酸基又はその塩よりなる基を有する多糖類が、下記一般式(A)で表される構造を有する、請求項1に記載の平版印刷版原版。
-O-L-SO3 -X+ 一般式(A)
ここでLは、エチレン基又はプロピレン基を表し、X+は水素イオン、アルカリ金属イオン又はアンモニウムイオンを表す。 - 上記多糖類が、スルホン酸基又はその塩よりなる基を有するセルロースである、請求項1又は2に記載の平版印刷版原版。
- 請求項1~4のいずれか1項に記載の平版印刷版原版を、画像様露光した後に印刷機に装着し、印刷インキ及び湿し水の少なくともいずれかを供給する方法、又は、印刷機に装着した後に画像様露光した後、印刷インキ及び湿し水の少なくともいずれかを供給する方法によって機上現像処理を行う平版印刷版の製版方法。
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EP13842458.5A EP2902214B1 (en) | 2012-09-26 | 2013-08-19 | Lithographic presensitized plate and method for making lithographic printing plate |
BR112015006131A BR112015006131A2 (ja) | 2012-09-26 | 2013-08-19 | A platemaking method of a planographic printing original plate and a lithographic printing plate |
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US14/667,949 US9535323B2 (en) | 2012-09-26 | 2015-03-25 | Lithographic printing plate precursor and plate making method of lithographic printing plate |
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WO2016140820A1 (en) * | 2015-03-03 | 2016-09-09 | Eastman Kodak Company | Negative-working lithographic printing plate precursor |
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WO2017018262A1 (ja) * | 2015-07-30 | 2017-02-02 | 富士フイルム株式会社 | 平版印刷版原版、平版印刷版の作製方法、及び、有機-無機ハイブリッド粒子 |
JP6934939B2 (ja) | 2017-05-31 | 2021-09-15 | 富士フイルム株式会社 | 平版印刷版原版、及び平版印刷版の作製方法 |
JP6977065B2 (ja) * | 2018-01-31 | 2021-12-08 | 富士フイルム株式会社 | 平版印刷版原版、及び、平版印刷版の作製方法 |
WO2020027071A1 (ja) * | 2018-07-30 | 2020-02-06 | 富士フイルム株式会社 | 機上現像型平版印刷版原版、平版印刷版の作製方法、及び、平版印刷方法 |
CN111103759B (zh) * | 2018-10-26 | 2023-06-06 | 乐凯华光印刷科技有限公司 | 一种低化学处理热敏版及其制备方法 |
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WO2020158287A1 (ja) * | 2019-01-31 | 2020-08-06 | 富士フイルム株式会社 | 平版印刷版原版、平版印刷版の作製方法、及び、平版印刷方法 |
WO2020158139A1 (ja) * | 2019-01-31 | 2020-08-06 | 富士フイルム株式会社 | 平版印刷版原版、平版印刷版の作製方法、及び、平版印刷方法 |
CN114051459B (zh) * | 2019-06-28 | 2024-07-23 | 富士胶片株式会社 | 平版印刷版原版、平版印刷版的制作方法及平版印刷方法 |
WO2020262689A1 (ja) * | 2019-06-28 | 2020-12-30 | 富士フイルム株式会社 | 機上現像型平版印刷版原版、平版印刷版の作製方法、及び、平版印刷方法 |
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US20150198878A1 (en) | 2015-07-16 |
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JP5786099B2 (ja) | 2015-09-30 |
EP2902214B1 (en) | 2017-09-27 |
CN104684735A (zh) | 2015-06-03 |
US20170017157A1 (en) | 2017-01-19 |
CN104684735B (zh) | 2017-05-03 |
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