WO2011122378A1 - 平版印刷版の製版方法 - Google Patents
平版印刷版の製版方法 Download PDFInfo
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- WO2011122378A1 WO2011122378A1 PCT/JP2011/056634 JP2011056634W WO2011122378A1 WO 2011122378 A1 WO2011122378 A1 WO 2011122378A1 JP 2011056634 W JP2011056634 W JP 2011056634W WO 2011122378 A1 WO2011122378 A1 WO 2011122378A1
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- printing plate
- lithographic printing
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- fine particles
- lithographic
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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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- 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
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0388—Macromolecular compounds which are rendered insoluble or differentially wettable with ethylenic or acetylenic bands in the side chains of the photopolymer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/092—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by backside coating or layers, by lubricating-slip layers or means, by oxygen barrier layers or by stripping-release layers or means
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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
- G03F7/3035—Imagewise removal using liquid means from printing plates fixed on a cylinder or on a curved surface; from printing cylinders
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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
- B41C1/1016—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
- B41C2201/02—Cover layers; Protective layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
- B41C2201/04—Intermediate layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
- B41C2201/10—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by inorganic compounds, e.g. pigments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
- B41C2201/12—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by non-macromolecular organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
- B41C2201/14—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by macromolecular organic compounds, e.g. binder, adhesives
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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
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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
- B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers
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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
- B41C2210/26—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds
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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
- B41C2210/26—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds
- B41C2210/266—Polyurethanes; Polyureas
Definitions
- the present invention relates to a method for making a planographic printing plate. Specifically, the present invention relates to a plate making method in which a lithographic printing plate precursor is exposed to UV through a lith film and developed on the machine.
- 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
- development or plate making is simplified or eliminated.
- 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 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 semiconductor laser emitting an infrared ray of 1200 nm is used.
- Patent Documents 1 and 2 include an infrared absorbing dye, a polymerization initiator, and a polymerizable property on a hydrophilic support.
- a lithographic printing plate precursor having an image recording layer (thermosensitive layer) containing a compound, a microcapsule encapsulating a polymerizable compound or polymer particles having a polymerizable group is described.
- image recording layer thermosensitive layer
- printing durability is insufficient and on-press developability is also insufficient.
- an image is not formed by UV exposure through a mask such as a lith film.
- lithographic printing plate precursors that can be developed on-machine with UV exposure through a mask such as a lithographic film are already known, but these do not form an image by exposure with a semiconductor laser that emits infrared rays, and are developed on-machine. Poor properties (Patent Documents 3 to 5).
- a mat layer composed of protrusions provided independently from each other is preferably provided on the image recording layer in order to improve the adhesion to the lith film during evacuation.
- a method for forming the mat layer there is a method in which polymer-containing water is sprayed and dried (Patent Document 6). Also known is a method of adding polymer fine particles such as polyethylene to the image recording layer or the upper layer of the image recording layer (Patent Document 7).
- the matte liquid penetrates into the image recording layer.
- the on-press developability is insufficient and the polymer fine particles are wetted after the on-press development and are deposited on a water roller, an ink roller, etc., and transferred to a printed matter.
- Patent Document 8 As an on-press developable lithographic printing plate precursor that solves these problems, there is a lithographic printing plate precursor having a polymer having a polyoxyalkylene chain in the side chain in the image recording layer, both in UV exposure and in infrared exposure, Both have insufficient printing durability (Patent Document 8).
- Japanese Unexamined Patent Publication No. 2001-277740 Japanese Laid-Open Patent Publication No. 2001-277742 Japanese Unexamined Patent Publication No. 2000-39711 Japanese Laid-Open Patent Publication No. 4-166934 Japanese National Table No. 10-500915 Japanese Unexamined Patent Publication No. 58-182636 Japanese Patent Publication No. 61-8421 US Patent Application Publication No. 2003/0064318
- the present invention relates to an on-press developable lithographic printing plate precursor exhibiting high printing durability by image exposure of a semiconductor laser that emits infrared rays, UV exposure through a lith film, and lithographic printing plate making on-press development
- the purpose of the present invention is to provide a plate making method which has good printing durability and on-press developability, is less likely to cause residue deposition during on-press development, and has good vacuum adhesion to a lith film.
- the lithographic printing plate precursor introduced into the layer can make a lithographic printing plate having a high printing durability by either exposure with a semiconductor laser emitting infrared rays or UV exposure through a lithographic film.
- the inventors found that the lith film and the vacuum adhesion were good during decompression and the on-press developability was good, and the present invention was achieved. That is, the present invention is as follows.
- lithographic printing plate precursor having an image recording layer having an image recording layer capable of forming an image with a semiconductor laser emitting an infrared ray having a wavelength of 760 to 1200 nm in this order, and (2) on the lithographic printing plate precursor Place the squirrel film and reduce the pressure to bring the lithographic film and the lithographic printing plate precursor into close contact, (3) perform UV exposure, (4) attach to the cylinder on the printing press, and at least one of dampening water and ink, A method for making a lithographic printing plate comprising removing an image recording layer in a non-image area.
- the oxygen blocking layer contains a water-soluble resin and at least one selected from polymer fine particles having a polyoxyalkylene chain in the side chain, inorganic spherical fine particles, and inorganic layered fine particles.
- the lithographic printing plate precursor used in the present invention has a support and an image recording layer in this order, and further has an oxygen barrier layer if necessary. In some cases, an undercoat layer may be provided between the support and the image recording layer.
- the image recording layer in the present invention is an on-press developable image recording layer utilizing image formation by radical polymerization, and is a cyanine dye, diphenyliodonium salt optionally having a substituent on a phenyl group, or triphenylsulfonium. It contains a polymer, fine particles having a salt, a radical polymerizable compound and a polyoxyalkylene chain in the side chain. Below, each component which can be contained in an image recording layer is demonstrated one by one.
- Polymer fine particles having a polyoxyalkylene chain as a side chain examples include latex obtained by radical polymerization and microgel obtained by interfacial polymerization.
- the fine polymer particles having a polyoxyalkylene chain as a side chain of the present invention (hereinafter also simply referred to as a specific polymer compound) preferably have an average particle size in the range of 50 to 2000 nm, more preferably in the range of 60 to 1000 nm. Particularly preferably, it is in the range of 70 to 300 nm.
- the content of the specific polymer compound of the present invention is preferably 10 to 90% by mass, more preferably 10 to 80% by mass, and particularly preferably 15 to 70% by mass with respect to the total solid content of the image recording layer. . Within this range, good on-press developability, vacuum adhesion and printing durability can be obtained.
- the oxyalkylene group which is a repeating unit of the polyoxyalkylene chain is preferably an oxyalkylene group having 2 to 6 carbon atoms, more preferably an oxyethylene group or an oxypropylene group.
- One polyoxyalkylene chain may contain both an ethyleneoxy group and an oxypropylene group. Among these, an oxyethylene group is particularly preferable.
- the number of repeating oxyalkylene groups in the polyalkylene oxide chain is preferably 10 to 120, more preferably 20 to 70, and particularly preferably 20 to 50. Good on-press developability and printing durability can be obtained when the number of repeating oxyalkylene groups is in the range of 10 to 120. Microgel is preferred from the viewpoint of on-press developability than latex obtained by radical polymerization.
- microgel obtained by interfacial polymerization As the microgel in the present invention, a polyfunctional isocyanate compound having two or more isocyanate groups is dissolved in a solvent immiscible with water, and this solution is dissolved in a terminal amino group or hydroxy represented by the following general formula (I). After emulsifying and dispersing in an aqueous solution containing a polyether derivative having a group, it can be produced by removing the solvent from the oil droplets of the emulsified dispersion.
- a polyfunctional isocyanate compound having two or more isocyanate groups is dissolved in a solvent immiscible with water, and this solution is dissolved in a terminal amino group or hydroxy represented by the following general formula (I).
- At least one of the isocyanate compounds is a reaction product of at least a bifunctional isocyanate compound and a polyether derivative having a terminal amino group or a hydroxy group represented by the following general formula (I) with water: It can be produced by dissolving in an immiscible solvent, emulsifying and dispersing this solution in an aqueous solution, and then removing the solvent from the oil droplets of the emulsified dispersion.
- polyurea or polyurethane / urea obtained by polymerization reaction of an isocyanate compound and a polyether derivative having a terminal amino group or a hydroxy group represented by the following general formula (I) constitutes a wall material.
- X represents a linking group
- A represents a single bond, an arylene group or an alkylene group
- L represents an alkylene group having 2 to 6 carbon atoms
- R has an active hydrogen.
- No organic group Y represents —OH or —NH 2
- m represents 0 or 1.
- n is an average added mole number of the polyether group and is a number of 10 to 120.
- a known method can be applied as the operation. That is, it is an isocyanate compound that dissolves in a solvent immiscible with water, and is a polyfunctional isocyanate compound having two or more isocyanate functional groups ((1) at least a bifunctional isocyanate compound and (2) represented by the above general formula (I)
- An oil phase solution in which a reaction product of a polyether derivative having a terminal amino group or a hydroxy group may be contained in a solvent immiscible with water, and an aqueous solution (expressed by the above general formula (I)) (Which may contain a polyether derivative having a terminal amino group or a hydroxy group), and both are mixed and vigorously used, for example, at 12,000 rpm for 10 to 15 minutes using an emulsifying disperser such as a homogenizer.
- the average particle size of the microgel is preferably 50 to 2000 nm, more preferably 60 to 1000 nm, and particularly preferably 70 to 300 nm.
- polyfunctional isocyanate The polyfunctional isocyanate having two or more isocyanate groups will be described. Specific examples of such compounds include, for example, m-phenylene diisocyanate, p-phenylene diisocyanate, 2,6-tolylene diisocyanate, and 2,4-tolylene diisocyanate as bifunctional compounds having two isocyanate groups in the molecule.
- trifunctional or higher isocyanate compounds can also be used.
- the above-mentioned bifunctional isocyanate compound is used as a main raw material, these trimers (burette or isocyanurate), a polyfunctional adduct of a polyol such as trimethylolpropane and a bifunctional isocyanate compound.
- trimers burette or isocyanurate
- polyfunctional adduct of a polyol such as trimethylolpropane
- a bifunctional isocyanate compound Benzene isocyanate formalin condensate, polymers of isocyanate compounds having a polymerizable group such as methacryloyloxyethyl isocyanate, lysine triisocyanate, and the like can also be used.
- xylene diisocyanate and its hydrogenated product hexamethylene diisocyanate, tolylene diisocyanate and its hydrogenated product are used as main raw materials, and these trimers (burette or isosinurate) as well as adducts with trimethylolpropane are multifunctional. These are preferred. These compounds are described in “Polyurethane Resin Handbook” (edited by Keiji Iwata, published by Nikkan Kogyo Shimbun (1987)).
- 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, xylylene-1,4-diisocyanate, xylylene-1,3-diisocyanate, trimethylolpropane and xylylene-1,4-diisocyanate or xylylene 1,3-diisocyanate adducts are preferred, especially xylylene-1,4-diisocyanate and xylylene-1,3-diisocyanate, trimethylolpropane and xylylene-1,4-diisocyanate or xylylene-1,3-diisocyanate
- X represents a linking group
- A represents a single bond, an arylene group or an alkylene group
- L represents an alkylene group having 2 to 6 carbon atoms
- R has an active hydrogen.
- No organic group Y represents —OH or —NH 2
- m represents 0 or 1.
- n is an average added mole number of the polyether group and is a number of 10 to 120.
- R is preferably an alkyl group having 1 to 3 carbon atoms, and a methyl group is particularly preferred.
- L is preferably an ethylene group or a propylene group, and an ethylene group and a propylene group may coexist in one molecule.
- n is preferably 20 to 70, and more preferably 20 to 50.
- X is preferably an oxygen atom, and A is preferably a single bond.
- the mass average molar mass (Mw) of the polyether derivative is preferably 300 to 100,000, and more preferably 500 to 10,000.
- Mw mass average molar mass
- the molecular weight is from 300 to 100,000, it has a sufficient function as a protective colloid, can ensure the dispersion stability of the microgel, and can sufficiently obtain the hydrophilicity of the surface.
- Examples of the polymer having a polyoxyalkylene chain as a side chain used in the lithographic printing plate precursor according to the present invention include (meth) acrylic resins, vinyl resins, styrene resins, acrylonitrile resins, and polyvinyl acetal resins. A resin obtained by radical polymerization of is preferred.
- the polyalkylene oxide moiety is preferably contained in the structure represented by the general formula (1) as a side chain of the specific polymer compound. More preferably, it is contained in the structure represented by the general formula (1) as a side chain of the acrylic resin.
- y represents an integer of 10 to 120, preferably in the range of 20 to 70, and more preferably in the range of 20 to 50.
- R 1 represents a hydrogen atom or an alkyl group, preferably a hydrogen atom or a methyl group, and most preferably a hydrogen atom.
- R 2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
- R 2 is most preferably a hydrogen atom or a methyl group.
- the latex obtained by radical polymerization used in the present invention contains a repeating unit having a structure having a polyoxyalkylene group in the ester side chain of (meth) acrylic acid ester of general formula (3).
- Polymer fine particles of a copolymer obtained by radical polymerization of an ethylenically unsaturated group (hereinafter also referred to as an ethylenically unsaturated copolymer) are preferred.
- R 3 represents a hydrogen atom or a methyl group.
- R 1, R 2 and y are the same as R 1, R 2 and y in the general formula (1).
- the latex obtained by radical polymerization is preferably a polymer fine particle of an ethylenically unsaturated copolymer having a repeating unit having the following structure represented by general formulas (3-1) to (3-4).
- y represents 10 to 120, preferably 20 to 70, and more preferably 20 to 50.
- the copolymerizable monomer used in the present invention is not particularly limited, and a known or well-known compound having a carbon-carbon unsaturated double bond can be used effectively.
- acrylic esters examples include known monomers such as acrylic esters, methacrylic esters, acrylamides, methacrylamides, vinyl esters, styrenes, and (meth) acrylonitrile.
- acrylic esters include methyl acrylate, ethyl acrylate, (n- or i-) propyl acrylate, (n-, i-, sec- or t-) butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, Dodecyl acrylate, chloroethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 5-hydroxypentyl acrylate, cyclohexyl acrylate, allyl acrylate, trimethylolpropane monoacrylate, pentaerythritol monoacrylate, benzyl acrylate, methoxybenzyl acrylate, chloro Benzyl
- methacrylic acid esters include methyl methacrylate, ethyl methacrylate, (n- or i-) propyl methacrylate, (n-, i-, sec- or t-) butyl methacrylate, amyl methacrylate, 2-ethylhexyl methacrylate, Dodecyl methacrylate, chloroethyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 5-hydroxypentyl methacrylate, cyclohexyl methacrylate, allyl methacrylate, trimethylolpropane monomethacrylate, pentaerythritol monomethacrylate, glycidyl methacrylate, benzyl methacrylate, methoxybenzyl Methacrylate, chlorobenzyl methacrylate, hydroxybenzyl Acrylate, hydroxyphenethyl methacrylate, dihydroxyphen
- acrylamides include acrylamide, N-methylacrylamide, N-ethylacrylamide, N-propylacrylamide, N-butylacrylamide, N-benzylacrylamide, N-hydroxyethylacrylamide, N-phenylacrylamide, and N-tolylacrylamide.
- methacrylamides include methacrylamide, N-methylmethacrylamide, N-ethylmethacrylamide, N-propylmethacrylamide, N-butylmethacrylamide, N-benzylmethacrylamide, N-hydroxyethylmethacrylamide, N -Phenylmethacrylamide, N-tolylmethacrylamide, N- (hydroxyphenyl) methacrylamide, N- (sulfamoylphenyl) methacrylamide, N- (phenylsulfonyl) methacrylamide, N- (tolylsulfonyl) methacrylamide, N , N-dimethylmethacrylamide, N-methyl-N-phenylmethacrylamide, N-hydroxyethyl-N-methylmethacrylamide and the like.
- vinyl esters include vinyl acetate, vinyl butyrate, vinyl benzoate and the like.
- styrenes include styrene, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, propyl styrene, cyclohexyl styrene, chloromethyl styrene, trifluoromethyl styrene, ethoxymethyl styrene, acetoxymethyl styrene, methoxy styrene, dimethoxy styrene. Chlorostyrene, dichlorostyrene, bromostyrene, iodostyrene, fluorostyrene, carboxystyrene and the like.
- acrylic acid esters methacrylic acid esters, acrylamides, methacrylamides, vinyl esters, styrenes, and (meth) having 20 or less carbon atoms are particularly preferably used.
- Acrylonitrile is particularly preferably used.
- the copolymerizable ethylenically unsaturated monomer it is preferable to copolymerize a monomer having a homopolymer Tg of 80 ° C. or more from the viewpoint of vacuum adhesion of the lith film.
- the acrylonitrile is preferably contained, the content is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more. It is particularly preferable to contain at least mass%.
- the specific polymer compound preferably has a radical polymerizable group in order to improve the ink inking property of the image area.
- a radical polymerizable group when a polyoxyalkylene chain present as a side chain of a polymer fine particle, which occurs during a long UV exposure, interacts with a polymerizable compound in the growth stage in radical polymerization, It reacts with the ethylenically unsaturated group of the resin, and the micro structural change is fixed, and it is considered that the ink deposition property is further improved.
- 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.
- 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 ethylenically unsaturated bonds 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 (R of —COOR or —CONHR) is Mention may be made of polymers having an ethylenically unsaturated bond.
- R 1 to R 3 are each a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group, Represents an alkoxy group or an aryloxy group, and R 1 and R 2 or R 3 may combine with each other to form a ring
- n represents an integer of 1 to 10
- X represents dicyclopentadienyl.
- 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 specific polymer compound having crosslinkability is, for example, a free radical (polymerization initiation radical or a growth radical in the polymerization process of the polymerizable compound) is added to the crosslinkable functional group, and polymerization of the polymerizable compound is performed directly between the polymers. Addition polymerization through a chain forms a cross-link between polymer molecules and cures. Alternatively, atoms in the polymer (eg, hydrogen atoms on carbon atoms adjacent to the functional bridging group) are abstracted by free radicals to form polymer radicals that are bonded together, thereby causing cross-linking between polymer molecules. Forms and cures.
- a free radical polymerization initiation radical or a growth radical in the polymerization process of the polymerizable compound
- the content of the crosslinkable group in the specific polymer compound is preferably 0.1 to 10.0 mmol, more preferably 1 g per 1 g of the polymer compound. 1.0 to 7.0 mmol, most preferably 2.0 to 5.5 mmol. Within this range, good sensitivity and good storage stability can be obtained.
- the cyanine dye that absorbs infrared rays has a function of converting the absorbed infrared rays into heat and a function of being excited by infrared rays and transferring electrons and / or energy to a radical polymerizable compound described later.
- the cyanine dye used in the present invention is a dye having an absorption maximum at a wavelength of 760 to 1200 nm.
- Particularly preferred examples include cyanine dyes represented by the following general formula (a).
- 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 each may have a substituent, an aryl group having 6 to 10 carbon atoms, an alkyl group having 1 to 8 carbon atoms, a hydrogen atom R 9 and R 10 may be bonded to each other to form a ring. Of these, a phenyl group is preferred (—NPh 2 ).
- X 2 represents an oxygen atom or a sulfur atom
- L 1 represents a hydrocarbon group having 1 to 12 carbon atoms, a heteroaryl group, or a hydrocarbon group having 1 to 12 carbon atoms including a hetero atom.
- a hetero atom here shows N, S, O, a halogen atom, and Se.
- Xa - has Za described later - is defined as for, 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 each independently represents 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 and a naphthalene ring.
- a C12 or less hydrocarbon group, a halogen atom, a C12 or less alkoxy group, and a sulfo 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.
- Preferable substituents include an alkoxy group having 12 or less carbon atoms, a carboxy group, an oxycarbonyl 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. From the availability of raw materials, a hydrogen atom is preferred.
- Za ⁇ represents a counter anion. However, Za ⁇ is not necessary when the cyanine dye represented by formula (a) has an anionic substituent in its structure and neutralization of charge is not necessary.
- Preferred Za ⁇ is a halide ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, and a sulfonate ion, particularly preferably a perchlorate ion, in view of the storage stability of the image recording layer coating solution.
- Hexafluorophosphate ions, and aryl sulfonate ions are examples of the storage stability of the image recording layer coating solution.
- X 1 represents —NPh 2
- R 1 and R 2 are connected to each other to form a 5-membered ring
- Ar 1 and Ar 2 are both the same and have a substituent.
- Y 1 and Y 2 both represent the same dimethylmethylene group
- R 3 , R 4 represents a both carbon atoms which may have the same substituent more than 5 hydrocarbon groups, preferred substituents, carbon atoms more than three alkoxy groups, an oxycarbonyl group.
- cyanine dye represented by formula (a) that can be suitably used include compounds described in paragraphs [0017] to [0019] of JP-A No. 2001-133969, JP-A No. 2002-040638. Compounds described in paragraphs [0012] to [0037] of the publication, paragraphs [0034] to [0041] of JP 2002-278057 A, paragraphs [0080] to [0086 of JP 2008-195018 A And the compounds described in paragraph numbers [0035] to [0043] of JP-A-2007-90850. Specific examples include cyanine dyes having the following structure.
- the content of the cyanine dye in the image recording layer is preferably from 0.1 to 10.0% by mass, more preferably from 0.5 to 5.0% by mass, based on the total solid content of the image recording layer.
- the diphenyliodonium salt or triphenylsulfonium salt used in the present invention is a compound that initiates and accelerates the polymerization of the radically polymerizable compound (D).
- Examples of the diphenyliodonium salt include, for example, European Patent Nos. 104 and 143, US Patent Application Publication Nos. 2008/0311520, JP-A-2-150848, JP-A-2008-195018, and J.P. V. It is an iodonium salt described in Crivello et al, Macromolecules, 10 (6), 1307 (1977).
- triphenylsulfonium salt examples include, for example, European Patent Nos. 370,693, 233,567, 297,443, 297,442, U.S. Pat. Nos. 4,933,377, 4,760, No. 013, No. 4,734,444, No. 2,833,827, German Patent No. 2,904,626, No. 3,604,580, No. 3,604,581 And the described sulfonium salts. Although the specific example of these compounds is shown below, it is not limited to this.
- the diphenyliodonium salt may have a substituent on the phenyl group, and is particularly preferably a diphenyliodonium salt substituted with an electron donating group such as an alkyl group or an alkoxyl group, more preferably an asymmetric diphenyliodonium salt. Is preferred.
- 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 triphenylsulfonium salt may have a substituent on the phenyl group, and a triphenylsulfonium salt having a halogen atom on the phenyl group is particularly preferable.
- diphenyliodonium salts or triphenylsulfonium salts are preferably from 0.1 to 50% by mass, more preferably from 0.5 to 30% by mass, particularly preferably 0.8%, based on the total solid content constituting the image recording layer. It can be added at a ratio of ⁇ 20% by mass. Within this range, good sensitivity and good stain resistance of the non-image area during printing can be obtained.
- the radical polymerizable compound used for the image recording layer in the present invention is an addition polymerizable compound having at least one ethylenically unsaturated double bond, and has at least one, preferably two or more terminal ethylenically unsaturated bonds. Selected from compounds. These have chemical forms such as monomers, prepolymers, ie dimers, trimers and oligomers, or mixtures thereof. Examples of monomers include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), esters and amides thereof, preferably unsaturated carboxylic acids.
- unsaturated carboxylic acids for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.
- esters and amides thereof preferably unsaturated carboxylic acids.
- 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.
- an addition reaction product of an unsaturated carboxylic acid ester or amide having a nucleophilic substituent such as a hydroxy group, an amino group or a mercapto group with a monofunctional or polyfunctional isocyanate or epoxy, and a monofunctional or polyfunctional compound 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 an addition reaction of isocyanate and hydroxy group are also suitable. Specific examples thereof include, for example, one molecule described in JP-B-48-41708.
- a vinyl containing two or more polymerizable vinyl groups in one molecule obtained by adding a vinyl monomer containing a hydroxy group represented by the following general formula (A) to a polyisocyanate compound having two or more isocyanate groups.
- a urethane compound etc. are mentioned.
- CH 2 C (R 4) COOCH 2 CH (R 5) OH (A) (However, R 4 and R 5 represent H or CH 3. )
- urethanes described in JP-A-51-37193, JP-B-2-32293, JP-B-2-16765, JP-A-2003-344997, and JP-A-2006-65210 are also 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. 7,153,632, 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 details of the method of use such as the structure of these polymerizable compounds, whether they are used alone or in combination, and the amount added can be arbitrarily set according to the performance design of the final planographic printing plate precursor.
- the polymerizable compound is preferably used in the range of 5 to 75% by mass, more preferably 5 to 70% by mass, and particularly preferably 10 to 60% by mass with respect to the total solid content of the image recording layer.
- Binder polymer In the image recording layer of the present invention, a binder polymer can be used in order to improve the film strength of the image recording layer.
- a binder polymer that can be used in the present invention, conventionally known binder polymers can be used without limitation, and polymers having film properties are preferred. Of these, acrylic resins, polyvinyl acetal resins, and polyurethane resins are preferable.
- a crosslinkable functional group for improving the film strength of an image portion is a main chain or a side chain, preferably a side chain.
- Crosslinking is formed between the polymer molecules by the crosslinkable group, and curing is accelerated.
- the crosslinkable functional group is preferably an ethylenically unsaturated group such as a (meth) acryl group, a vinyl group or an allyl group, or an epoxy group, and these groups can be introduced into the polymer by polymer reaction or copolymerization.
- a reaction between an acrylic polymer or polyurethane having a carboxy group in the side chain and polyurethane and glycidyl methacrylate, or a reaction between a polymer having an epoxy group and an ethylenically unsaturated group-containing carboxylic acid such as methacrylic acid can be used.
- the content of the crosslinkable group in the binder polymer is preferably 0.1 to 10.0 mmol, more preferably 1.0 to 7.0 mmol, and most preferably 2.0 to 5.5 mmol per 1 g of the binder polymer. .
- the binder polymer of the present invention preferably further has a hydrophilic group.
- the hydrophilic group contributes to imparting on-press developability to the image recording layer.
- the coexistence of the crosslinkable group and the hydrophilic group makes it possible to achieve both printing durability and developability.
- hydrophilic group examples include a hydroxy group, a carboxy group, an alkylene oxide structure, an amino group, an ammonium group, an amide group, a sulfo group, and a phosphoric acid group.
- an alkylene oxide unit having 2 or 3 carbon atoms An alkylene oxide structure having 1 to 9 is preferred.
- a polyethylene oxide structure having 2 to 8 ethylene oxide units is preferred.
- a monomer having a hydrophilic group may be copolymerized.
- an oleophilic group such as an alkyl group, an aryl group, an aralkyl group or an alkenyl group can be introduced in order to control the inking property.
- a lipophilic group-containing monomer such as an alkyl methacrylate may be copolymerized.
- the ratio of repeating units is a molar ratio.
- the binder polymer preferably has a mass average molar mass (Mw) of 2000 or more, more preferably 5000 or more, and still more preferably 10,000 to 300,000.
- hydrophilic polymers such as polyacrylic acid and polyvinyl alcohol described in JP-A-2008-195018 can be used as necessary. Further, a lipophilic binder polymer and a hydrophilic binder polymer can be used in combination.
- the content of the binder polymer is usually 5 to 90% by mass, preferably 5 to 80% by mass, and more preferably 10 to 70% by mass with respect to the total solid content of the image recording layer.
- the image recording layer in the invention may further contain other components as required.
- 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, Polyhydroxys such as pentaerythritol and tris (2-hydroxyethyl) isocyanurate, organic amines such as triethanolamine and diethanolamine 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.
- 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, it is 1 mass% or more and 10 mass% or less, More preferably, it is 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 lipid sensitizer such as a phosphonium compound, a nitrogen-containing low molecular weight compound, or an ammonium group-containing polymer is used for the image recording layer in order to improve the inking property.
- a lipid sensitizer such as a phosphonium compound, a nitrogen-containing low molecular weight compound, or an ammonium group-containing polymer is used for the image recording layer in order to improve the inking property. be able to.
- 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. .
- the ammonium salt-containing polymer preferably has a reduced specific viscosity (unit: cSt / g / ml) determined by the following measurement method, preferably in the range of 5 to 120, more preferably in the range of 10 to 110. A range of 15 to 100 is particularly preferable.
- 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.
- the lithographic printing plate precursor used in the present invention preferably has an oxygen barrier layer.
- the oxygen blocking layer preferably contains a water-soluble resin and at least one selected from polymer fine particles having a polyoxyalkylene chain in the side chain, inorganic spherical fine particles, and inorganic layered fine particles.
- the water-soluble resin for binding the fine particles is not particularly limited and may be appropriately selected as long as the dispersibility of the fine particles is good and a uniform film that adheres closely to the image recording layer can be formed.
- polyvinyl alcohol modified polyvinyl alcohol, polyvinyl pyrrolidone, gelatin, gum arabic and the like are more preferable from the viewpoint that they can be applied using water as a solvent and can be easily removed by dampening water during printing.
- the polyvinyl alcohol that can be used in the oxygen barrier layer according to the present invention may be partially substituted with an ester, an ether, and an acetal as long as it contains a substantial amount of an unsubstituted vinyl alcohol unit having the necessary water solubility. .
- a part may contain other copolymerization components.
- Specific examples of polyvinyl alcohol include those having a hydrolysis degree of 71 to 100 mol% and a polymerization degree in the range of 300 to 2400.
- the copolymer include 88-100 mol% hydrolyzed polyvinyl acetate chloroacetate or propionate, polyvinyl formal, polyvinyl acetal, and copolymers thereof.
- modified polyvinyl alcohol can be preferably used.
- various hydrophilic modification sites such as anion modification sites modified with anions such as carboxyl groups and sulfo groups, cation modification sites modified with cations such as amino groups and ammonium groups, silanol modification sites, and thiol modification sites are randomly selected.
- Polyvinyl alcohol having various degrees of polymerization, the anion-modified site, the cation-modified site, the silanol-modified site, the thiol-modified site, the alkoxyl-modified site, the sulfide-modified site, and the ester-modified site of vinyl alcohol and various organic acids.
- Polyvinyl alcohol having various polymerization degrees having various modified sites such as an ester-modified site of the anion-modified site and alcohols, an epoxy-modified site, and the like at the polymer chain end.
- polyvinyl alcohol having an anion-modified site is preferable, and one modified with an anion of a sulfo group is particularly preferable.
- modified polyvinyl alcohol of the present invention Commercial products may be used as the modified polyvinyl alcohol of the present invention.
- commercially available products are Kuraray Poval KM-118, KL-118, KL-318, KL-506, KM-618 (manufactured by Kuraray Co., Ltd.), Gohsenal T, Gohselan L-3266 (Nippon Synthetic Chemical Industry Co., Ltd.) ) Made).
- Two or more kinds of modified polyvinyl alcohol may be used in combination.
- the fine particles are at least one selected from polymer fine particles having a polyoxyalkylene chain in the side chain, inorganic spherical fine particles, and inorganic layered fine particles.
- polymer fine particles polymer fine particles having a polyoxyalkylene chain in the side chain are preferred from the viewpoint of suppression of residue deposition during on-press development.
- the content of all fine particle components contained in the oxygen barrier layer is preferably 0.1 to 80% by mass, more preferably 1 to 50% by mass, and still more preferably 5 to 30% by mass.
- the content of fine particles in the oxygen barrier layer is preferably 5/1 to 1/100 in terms of mass ratio with respect to the amount of the water-soluble resin used in the oxygen barrier layer. Even when a plurality of types of fine particles are used in combination, the total amount of these fine particles is preferably the above-described mass ratio.
- Polymer fine particles having a polyoxyalkylene chain as a side chain examples include the same polymer fine particles as those used in the image recording layer.
- Inorganic spherical fine particles include metals and metal compounds such as oxides, composite oxides, hydroxides, carbonates, sulfates, silicates, phosphates, nitrides, carbides, sulfides and at least two of these.
- Examples include composites of more than one species, specifically, glass, zinc oxide, silica, alumina, zircon oxide, tin oxide, potassium titanate, strontium titanate, aluminum borate, magnesium oxide, magnesium borate, aluminum hydroxide , Magnesium hydroxide, calcium hydroxide, titanium hydroxide, basic magnesium sulfate, calcium carbonate, magnesium carbonate, calcium sulfate, magnesium sulfate, calcium silicate, magnesium silicate, calcium phosphate, silicon nitride, titanium nitride, aluminum nitride, carbonized Silicon, titanium carbide, zinc sulfide and their small amounts Both such two or more composite compound thereof.
- Preferred examples include glass, silica, alumina, potassium titanate, strontium titanate, aluminum borate, magnesium oxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium phosphate, and calcium sulfate.
- fillers can be commercial products.
- a silica filler SNOWTEX 50 (particle diameter 0.025 ⁇ m), SNOWTEX O-40 (particle diameter 0.025 ⁇ m), SNOWTEX CM (particle diameter 0.025 ⁇ m) manufactured by Nissan Chemical Industries, Ltd., Snowtex 20L (particle diameter 0.045 ⁇ m), Snowtex XL (particle diameter 0.05 ⁇ m), Snowtex YL (particle diameter 0.65 ⁇ m), Snowtex ZL (particle diameter 0.85 ⁇ m), MP1040 (particle diameter 0.
- the inorganic component is silica (SiO 2 ) from the viewpoint of dispersion stability, cost, and high friction coefficient when used as a coating solution.
- the average size of the inorganic spherical fine particles is preferably 50 to 2000 nm, more preferably 60 to 1000 nm, and particularly preferably 70 to 300 nm. If it is 50 nm or more, the vacuum adhesion is further improved. If it is 2000 nm or less, the oxygen barrier property is sufficient, so that the image forming sensitivity does not decrease, and the contact area of the inorganic spherical fine particles is sufficient, so that the effect of increasing the friction coefficient is sufficiently obtained and the deviation is less likely to occur. .
- the average particle size was measured by a centrifugal sedimentation method using a particle size distribution measuring device BI-DCP (manufactured by Brookhaven Instruments).
- an inorganic layered compound may be contained in combination with a water-soluble resin, and the inorganic layered compound is a particle having a thin flat plate shape.
- the following general formula A (B, C) 2-5 D 4 O 10 (OH, F, O) 2 [However, A is any of K, Na, and Ca, B and C are any of Fe (II), Fe (III), Mn, Al, Mg, and V, and D is Si or Al.
- mica groups such as natural mica and synthetic mica, talc, teniolite, montmorillonite, saponite, hectorite, zirconium phosphate and the like represented by the formula 3MgO.4SiO.H 2 O.
- examples of natural mica include muscovite, soda mica, phlogopite, biotite and sericite.
- non-swelling mica such as fluorine phlogopite mica 3 (AlSi 3 O 10 ) F 2 , potassium tetrasilicon mica KMg 2.5 Si 4 O 10 ) F 2 , and Na tetrasilicic mica NaMg 2.5 (Si 4 O 10 ) F 2 , Na or Li Tenniolite (Na, Li) Mg 2 Li (Si 4 O 10 ) F 2 , Montmorillonite Na or Li Hectorite (Na, Li) 1/8 Mg Swellable mica such as 2/5 Li 1/8 (Si 4 O 10 ) F 2 can be used. Synthetic smectite is also useful.
- mica is preferable among the inorganic layered compounds described above, and fluorine-based swellable mica which is a synthetic inorganic layered compound is particularly useful. That is, this swellable synthetic mica and swellable clay minerals such as montmorillonite, saponite, hectorite, bentonite and the like have a laminated structure composed of unit crystal lattice layers with a thickness of about 10 to 15 mm, Atomic substitution is significantly greater than other clay minerals. As a result, the lattice layer is deficient in positive charge, and in order to compensate for this, cations such as Li + , Na + , Ca 2+ , and Mg 2+ are adsorbed between the layers.
- cations such as Li + , Na + , Ca 2+ , and Mg 2+ are adsorbed between the layers.
- the bond between the layered crystal lattices is weak because the ionic radius is small, and it swells greatly with water. If shear is applied in this state, it will easily cleave and form a stable sol in water.
- Bentonite and swellable synthetic mica have a strong tendency and are useful in the present invention, and swellable synthetic mica is particularly preferably used.
- the aspect ratio is preferably 20 or more, more preferably 100 or more, and particularly preferably 200 or more.
- the aspect ratio is the ratio of the major axis to the thickness of the particle, and can be measured, for example, from a projected view of the particle by a micrograph. The larger the aspect ratio, the greater the effect that can be obtained.
- the particle size of the inorganic stratiform compound used in the present invention is such that the average major axis is 0.3 to 20 ⁇ m, preferably 0.5 to 10 ⁇ m, particularly preferably 1 to 5 ⁇ m.
- the average thickness of the particles is 0.1 ⁇ m or less, preferably 0.05 ⁇ m or less, particularly preferably 0.01 ⁇ m or less.
- the swellable synthetic mica which is a representative compound among inorganic layered compounds, has a thickness of 1 to 50 nm and a surface size of about 1 to 20 ⁇ m.
- the coating film strength is improved and oxygen and moisture permeation can be effectively prevented. Deterioration of the layer is prevented, and even when stored for a long time under a high humidity condition, the storage stability is excellent without a decrease in image forming property in the lithographic printing plate precursor due to a change in humidity.
- an undercoat 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.
- the compound used for the undercoat layer include a silane coupling agent having an addition polymerizable ethylenic double bond reactive group described in JP-A-10-282679, Examples thereof include phosphorus compounds having an ethylenic double bond reactive group described in Japanese Patent No. 304441. More preferable are polymer resins having an adsorptive group, a hydrophilic group, and a crosslinkable group that can be adsorbed on the support surface, as described in JP-A Nos. 2005-125749 and 2006-188038. It is done.
- the polymer resin is preferably a copolymer of a monomer having an adsorptive group, a monomer having a hydrophilic group, and a monomer having a crosslinkable group. More specifically, it has an adsorbing group such as 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, etc.
- Examples thereof include a polymer resin that is a copolymer of a monomer, a monomer having a hydrophilic sulfo group, and a monomer having a polymerizable crosslinkable group such as a methacryl group or an allyl group.
- This polymer resin may have a crosslinkable group introduced by salt formation between a polar substituent of the polymer resin, a substituent having a counter charge and a compound having an ethylenically unsaturated bond,
- Other monomers, preferably hydrophilic monomers may be further copolymerized.
- the content of unsaturated double bonds in the polymer resin for the undercoat layer is preferably 0.1 to 10.0 mmol, and most preferably 2.0 to 5.5 mmol per 1 g of the polymer resin.
- the polymer resin 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 of the present invention comprises, in addition to the above undercoat compound, a chelating agent, a secondary or tertiary amine, a polymerization inhibitor, an amino group, or a functional group having a polymerization inhibiting ability, in order to prevent contamination over time.
- a chelating agent 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, and the like.
- 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 in the 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 of the present invention includes an organic polymer compound described in JP-A-5-45885 and a silicon alkoxy compound described in JP-A-6-35174 on the back surface.
- a backcoat layer can be provided.
- ⁇ UV exposure / transparent substrate / reduced pressure As the ultraviolet ray, a flatbed exposure machine used for exposure of a conventional PS plate that has been image-exposed through a lith film can be preferably applied. At this time, evacuation which is normally equipped in a flat table exposure machine is performed. That is, the lithographic printing plate precursor is raised on an exposure table, and a lith film is placed thereon. Further, a transparent substrate such as glass or a transparent film is placed on the squirrel film, vacuumed, and exposed to UV with a halogen lamp or a mercury lamp. The degree of vacuum is preferably 100 mmHg or less. Especially preferably, it is 30 mmHg or less.
- 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 a printing process, wherein an unexposed portion of the planographic printing plate precursor is removed during the printing process.
- Image exposure can be performed by both high-power infrared semiconductor laser exposure and UV exposure by a high-pressure mercury lamp or metal halide lamp after placing a lith film and evacuating it.
- the lithographic printing plate precursor is mounted on a printing machine as it is without undergoing a development process. Thereafter, by using the printing machine and supplying the oil-based ink and the aqueous component and printing as it is, an on-press development process, that is, an image recording layer in an 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.
- an on-press development process that is, an image recording layer in an 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.
- the molecular weight is a mass average molar mass (Mw), and the ratio of the repeating units is a mole percentage except for those specifically defined.
- Preparation of lithographic printing plate precursor (1) (1) Preparation of support In order to remove rolling oil on the surface of an aluminum plate (material JIS A 1050) having a thickness of 0.3 mm, degreasing treatment was performed at 50 ° C. for 30 seconds using a 10 mass% sodium aluminate aqueous solution. After that, the aluminum surface was grained using three bundle-planted nylon brushes having a bristle diameter of 0.3 mm and a pumice-water suspension (specific gravity 1.1 g / cm 3 ) having a median diameter of 25 ⁇ m and washed thoroughly with water. .
- This plate was etched by being immersed in a 25 mass% aqueous sodium hydroxide solution at 45 ° C for 9 seconds, washed with water, further immersed in a 20 mass% nitric acid aqueous solution at 60 ° C for 20 seconds, and washed with water. 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.
- Electrochemical surface roughening treatment was carried out in the same manner as above, followed by washing with water by spraying.
- a 2.5 g / m 2 direct current anodic oxide film having a current density of 15 A / dm 2 was provided on the plate as a 15% by weight sulfuric acid aqueous solution (containing 0.5% by weight of aluminum ions) as an electrolyte, followed by washing with water.
- 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.
- An image recording layer coating solution having the following composition was bar coated on the undercoat layer formed as described above, and then oven-dried at 100 ° C. for 60 seconds to obtain a dry coating amount of 1.0 g. An image recording layer of / m 2 was formed.
- the image recording layer coating solution was obtained by mixing and stirring the following image recording layer pre-coating solution and polymer fine particle aqueous dispersion immediately before coating.
- binder polymer (1) radical polymerization initiator (1), phosphonium compound (1), low molecular weight hydrophilic compound (1), ammonium group-containing polymer, and fluorine-based surfactant (1) are as follows: It is as shown below.
- microgel (1) having polyoxyalkylene chain in side chain
- oil phase component 4.46 g of a polyfunctional isocyanate having the following structure (made by Mitsui Chemicals Polyurethane; 75% by mass ethyl acetate solution), trimethylolpropane (6 mol) and xylene diisocyanate (18 mol) were added.
- Example 2 to 10 and Comparative Examples 1 to 3 The cyanine dye (A-7) and radical polymerization initiator (1) of Example 1 were replaced as shown in Table 2, and lithographic printing plate precursors (2) to (13) were prepared.
- the exposure was performed under the conditions of an external drum rotation speed of 1000 rpm, a laser output of 70%, and a resolution of 2400 dpi using Fujifilm's Luxel PLASETTER T-6000III equipped with an infrared semiconductor laser.
- the exposure image included a solid image and a 50% halftone dot chart of a 20 ⁇ m dot FM screen.
- the polymerization initiator combined with the cyanine dye is diphenyliodonium salt or triphenylsulfonium salt, high printing durability is exhibited in UV exposure and infrared laser exposure.
- Example 11 to 22 and Comparative Examples 4 to 10 (1) Formation of Image Recording Layer
- the microgel (1) in the polymer fine particle aqueous dispersion used in Example 1 is shown in Table 4.
- Each image recording layer was formed in the same manner as in Example 1 except that the microgel or polymer fine particles described later were used. However, the fine particle aqueous dispersion was used by adjusting the fine particle concentration to 11.3 mass%.
- microgel (2) (having polyoxyalkylene chain in the side chain and having ethylenically unsaturated bond)-
- oil phase component 4.46 g of a polyfunctional isocyanate having the above structure (made by Mitsui Chemicals Polyurethane; 75% by mass ethyl acetate solution), trimethylolpropane (6 mol) and xylene diisocyanate (18 mol) were added.
- adduct Mitsubishi Chemical Polyurethane; 50% by mass ethyl acetate solution obtained by adding polyoxyethylene (1 mol, 90 repeats of oxyethylene units) to methyl one end, Karenz MOI (Showa Denko) ) 0.5 g of (2-methacryloyloxyethyl isocyanate) and 0.05 g of Pionine A-41C (manufactured by Takemoto Yushi; 70% methanol solution) were dissolved in 4.46 g of ethyl acetate. 17.30 g of water as an oil phase component and an aqueous phase component were mixed and emulsified for 15 minutes at 10,000 rpm using a homogenizer. The obtained emulsion was stirred at 40 ° C. for 4 hours. The solid content concentration of the microgel solution thus obtained was diluted with water so as to be 21.8% by mass. The average particle size was 0.25 ⁇ m.
- microgel (3) (no polyoxyalkylene chain in the side chain)-
- an oil phase component trimethylolpropane and xylene diisocyanate adduct (Mitsui Chemical Polyurethane Co., Ltd., Takenate D-110N) 10 g, pentaerythritol triacrylate (Nippon Kayaku Co., Ltd., SR444) 3.15 g, And 0.1 g of Pionein A-41C (manufactured by Takemoto Yushi Co., Ltd.) was dissolved in 17 g of ethyl acetate.
- aqueous phase component 40 g of a 4% by mass aqueous solution of Kuraray Poval PVA-205 (polyvinyl alcohol 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 microgel solution thus obtained was diluted with distilled water to a solid content concentration of 15% by mass, and this was designated as the microgel (3). When the average particle size of the microgel was measured by a light scattering method, the average particle size was 0.2 ⁇ m.
- polymer fine particles (1) having polyoxyalkylene chain in side chain / containing acrylonitrile
- a 1000 ml four-necked flask was equipped with a stirrer, thermometer, dropping funnel, nitrogen inlet tube, reflux condenser, and nitrogen gas was introduced to perform deoxygenation, while polyethylene glycol methyl ether methacrylate (average of PEGMA ethylene glycol)
- the repeating unit was 50) 10 g, distilled water 200 g and n-propanol 200 g were added and heated until the internal temperature reached 70 ° C.
- 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.
- polymer fine particles (3) (having polyoxyalkylene chain in side chain and having ethylenically unsaturated group)-
- a 1000 ml four-necked flask was equipped with a stirrer, thermometer, dropping funnel, nitrogen inlet tube, reflux condenser, and nitrogen gas was introduced to perform deoxygenation, while polyethylene glycol methyl ether methacrylate (average of PEGMA ethylene glycol)
- the repeating unit was 50) 10 g, allyl methacrylate (AllylMA) 10 g, distilled water 200 g and n-propanol 200 g were added and heated until the internal temperature reached 70 ° C.
- the particle size distribution of the polymer fine particles had a maximum value at a particle size of 150 nm.
- an aqueous ammonium nitrate solution (concentration 58.8 ⁇ 10 ⁇ 3 mol / liter) was added to adjust the pH to 1.3 to 1.4. This was then stirred for 8 hours.
- the liquid thus obtained had a solid content concentration of 13.0% by mass and an average particle size of 0.2 ⁇ m.
- an oxygen barrier layer was formed by applying a coating liquid for oxygen barrier layer prepared as described below.
- the lithographic printing plate precursors (19) to (21), (23) to (25) and (29) to (32) are further applied to the coating solution for oxygen barrier layer which produced the lithographic printing plate precursor (18).
- An aqueous dispersion of fine particles described in 1) was added to form an oxygen barrier layer.
- the fine particle aqueous dispersion was used by adjusting the fine particle concentration to 3.2 mass%.
- an oxygen blocking layer coating solution having the following composition was further bar coated, followed by oven drying at 120 ° C. for 60 seconds to form an oxygen blocking layer having a dry coating amount of 0.15 g / m 2.
- a lithographic printing plate precursor was obtained.
- ⁇ Coating liquid for oxygen barrier layer (does not contain fine particles)> ⁇ Polyvinyl alcohol (Nippon Synthetic Chemical Industry Co., Ltd. CKS50, Sulfonic acid modification, saponification degree 99 mol% or more, polymerization degree 300) 6% by weight aqueous solution 0.55g ⁇ Polyvinyl alcohol (PVA-405 manufactured by Kuraray Co., Ltd.) Saponification degree 81.5 mol%, polymerization degree 500) 6% by mass aqueous solution 0.30g ⁇ Nippon Emulsion Co., Ltd. surfactant (Emalex 710) 1% by weight aqueous solution 0.86g ⁇ Ion-exchanged water 6.0g
- ⁇ Coating liquid for oxygen barrier layer > ⁇ Polyvinyl alcohol (Nippon Synthetic Chemical Industry Co., Ltd. CKS50, Sulfonic acid modification, saponification degree 99 mol% or more, polymerization degree 300) 6% by weight aqueous solution 0.55g ⁇ Polyvinyl alcohol (PVA-405 manufactured by Kuraray Co., Ltd.) Saponification degree 81.5 mol%, polymerization degree 500) 6% by mass aqueous solution 0.30g ⁇ Nippon Emulsion Co., Ltd. surfactant (Emalex 710) 1% by weight aqueous solution 0.86g ⁇ Ion-exchanged water 6.0g ⁇ Fine particle aqueous dispersion (adjusted fine particle concentration to 3.2% by mass) 1.5 g
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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。
一方、リスフィルムなどのマスクを通したUV露光を行う機上現像可能な平版印刷版原版もすでに知られているが、これらは赤外線を放射する半導体レーザーによる露光では画像形成せず、機上現像性も悪い(特許文献3~5)。
真空引きの際のリスフィルムとの密着性を高めるために、画像記録層上には相互に独立して設けられた突起物により構成されるマット層があるのが好ましいことが知られている。
マット層の形成方法としては、ポリマー含有水をスプレーし乾燥させる方法などがある(特許文献6)。また、ポリエチレンなどのポリマー微粒子を画像記録層、又は画像記録層の上層に添加する方法が知られている(特許文献7)。
これらの課題を解決する機上現像可能な平版印刷版原版として、ポリオキシアルキレン鎖を側鎖に有するポリマーを画像記録層に有する平版印刷版原版があるが、UV露光においても赤外線露光においても、ともに耐刷性が不足している(特許文献8)。
即ち、本発明は、以下のとおりである。
2.画像記録層の上に酸素遮断層を有することを特徴とする前記1に記載の平版印刷版の製版方法。
3.酸素遮断層が、水溶性樹脂、並びに、ポリオキシアルキレン鎖を側鎖に有するポリマー微粒子、無機球状微粒子及び無機層状微粒子から選択される少なくとも一つを含有することを特徴とする前記2に記載の平版印刷版の製版方法。
4.ポリオキシアルキレン鎖を側鎖に有するポリマー微粒子がミクロゲルであることを特徴とする、前記1~3のいずれか1項の平版印刷版の製版方法。
5.無機球状微粒子が、シリカ微粒子であることを特徴とする前記3記載の平版印刷版の製版方法。
6.無機層状微粒子が、雲母であることを特徴とする前記3記載の平版印刷版の製版方法。
7.(1)支持体と、シアニン染料、フェニル基上に置換基を有していてもよいジフェニルヨードニウム塩又はトリフェニルスルホニウム塩、ラジカル重合性化合物及びポリオキシアルキレン鎖を側鎖に有するポリマー微粒子を含有する画像記録層を有する、波長760~1200nmの赤外線を放射する半導体レーザーによる画像形成が可能な画像記録層とをこの順に有する平版印刷版原版を準備し、(2)平版印刷版原版の上にリスフィルムを置き、減圧することによりリスフィルムと平版印刷版原版を密着させ、(3)UV露光を行い、(4)印刷機上のシリンダに取り付け、湿し水及びインキの少なくともいずれかにより非画像部の画像記録層を除去し、(5)印刷することを特徴とする平版印刷版の印刷方法。
本発明に用いる平版印刷版原版は、支持体と、画像記録層とをこの順に有し、必要により更にその上に酸素遮断層を有す。また、場合によって、支持体と画像記録層の間に下塗り層を有してもよい。
画像記録層の構成成分について詳細に説明する。
本発明における画像記録層は、ラジカル重合による画像形成を利用した機上現像可能な画像記録層であり、シアニン染料、フェニル基上に置換基を有していてもよいジフェニルヨードニウム塩又はトリフェニルスルホニウム塩、ラジカル重合性化合物及びポリオキシアルキレン鎖を側鎖に有するポリマー微粒子を含有する。
以下に、画像記録層に含有できる各成分について、順次説明する。
ポリオキシアルキレン鎖を側鎖として有するポリマー微粒子として、例えばラジカル重合で得られるラテックス、界面重合により得られるミクロゲルを挙げることができる。
本発明のポリオキシアルキレン鎖を側鎖として有するポリマー微粒子(以下において、単に特定高分子化合物とも称する)は、平均粒径は好ましくは50~2000nmの範囲であり、より好ましくは60~1000nmの範囲であり、特に好ましくは70~300nmの範囲である。
本発明の特定高分子化合物の含有量は、画像記録層の全固形分に対して、好ましくは10~90質量%、より好ましくは10~80質量%、特に好ましくは15~70質量%である。この範囲内で、良好な機上現像性、真空密着性及び耐刷性が得られる。
ポリアルキレンオキサイド鎖におけるオキシアルキレン基の繰返し数は10~120が好ましく、20~70の範囲がより好ましく、20~50の範囲が特に好ましい。
オキシアルキレン基の繰り返し数が10~120の範囲で良好な機上現像性と耐刷性が得られる。
ミクロゲルのほうが、ラジカル重合で得られるラテックスより、機上現像性の観点から好ましい。
本発明におけるミクロゲルとしては、2個以上のイソシアネート基を有する多官能イソシアネート化合物を水と非混和性の溶剤に溶解させ、この溶液を、下記一般式(I)で表される末端アミノ基又はヒドロキシ基を有するポリエーテル誘導体を含む水溶液に乳化分散させた後、乳化分散液の油滴から溶剤を除去することによって製造することができる。
又は、イソシアネート化合物の少なくとも1種が、少なくとも二官能性イソシアネート化合物と下記一般式(I)で表される末端アミノ基又はヒドロキシ基を有するポリエーテル誘導体との反応生成物であるイソシアネート化合物を水と非混和性の溶剤に溶解させ、この溶液を、水溶液に乳化分散させた後、乳化分散液の油滴から溶剤を除去することにより製造することができる。
これらのミクロゲルは、イソシアネート化合物と下記一般式(I)で表される末端アミノ基又はヒドロキシ基を有するポリエーテル誘導体との重合反応によって得られたポリウレア又はポリウレタン/ウレアが壁材を構成する。
2個以上のイソシアネート基を有する多官能イソシアネートについて説明する。
この様な化合物の具体例として、例えば分子中に2個のイソシアネート基を有する2官能化合物としてはm-フェニレンジイソシアネート、p-フェニレンジイソシアネート、2,6-トリレンジイソシアネート、2,4-トリレンジイソシアネート、ナフタレン-1,4-ジイソシアネート、ジフェニルメタン-4,4’-ジイソシアネート、3,3’-ジメトキシ-ビフェニルジイソシアネート、3,3’-ジメチルジフェニルメタン-4,4’-ジイソシアネート、キシリレン-1,4-ジイソシアネート、キシリレン-1,3-ジイソシアネート、4-クロロキシリレン-1,3-ジイソシアネート、2-メチルキシリレン-1,3-ジイソシアネート、4,4’-ジフェニルプロパンジイソシアネート、4,4’-ジフェニルヘキサフルオロプロパンジイソシアネート、トリメチレンジイソシアネート、ヘキサメチレンジイソシアネート、プロピレン-1,2-ジイソシアネート、ブチレン-1,2-ジイソシアネート、シクロヘキシレン-1,2-ジイソシアネート、シクロヘキシレン-1,3-ジイソシアネート、シクロヘキシレン-1,4-ジイソシアネート、ジシクロヘキシルメタン-4,4’-ジイソシアネート、1,4-ビス(イソシアネートメチル)シクロヘキサン及び1,3-ビス(イソシアネートメチル)シクロヘキサン、イソホロンジイソシアネート、リジンジイソシアネート等が挙げられる。
次に、一般式(I)で表される末端アミノ基又はヒドロキシ基を有するポリエーテル誘導体について説明する。
本発明の平版印刷版原版に用いられるポリオキシアルキレン鎖を側鎖として有するポリマーとしては、(メタ)アクリル樹脂、ビニル樹脂、スチレン系樹脂、アクリロニトリル系樹脂、ポリビニルアセタール樹脂などのエチレン性不飽和基をラジカル重合して得られる樹脂が好ましい。
R2は水素原子又は炭素原子数1~6のアルキル基を表す。メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、sec-ブチル基、イソブチル基、t-ブチル基、n-ペンチル基、イソペンチル基、ネオペンチル基、n-ヘキシル基、イソヘキシル基、1,1-ジメチルブチル基、2,2-ジメチルブチル基、シクロペンチル基、及びシクロヘキシル基が挙げられる。なかでもR2は水素原子又はメチル基であることが最も好ましい。
本発明において使用する共重合可能なモノマーとは、特に限定されず、炭素-炭素不飽和二重結合を有する公知ないしは周知の化合物が有用に使用できる。
上記の特定高分子化合物は、画像部のインキ着肉性を向上するために、ラジカル重合性基を有することが好ましい。ラジカル重合性基が存在すると、長時間のUV露光時に起こる、ポリマー微粒子の側鎖として存在するポリオキシアルキレン鎖とラジカル重合において生長段階にある重合性化合物が相互作用する際、近くにある微粒子中のエチレン性不飽和基と反応し、ミクロな構造変化が固定され、よりインキ着肉性が改良されると考えられる。
上記ポリマーに架橋性を持たせるためには、エチレン性不飽和結合などの架橋性官能基を高分子の主鎖中又は側鎖中に導入すればよい。架橋性官能基は、共重合により導入してもよい。
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。
以下に特定高分子化合物の具体的な構造を下記表1に示すが、本発明はこれらに限定されない。なお、下記(a)、(b-1)、(b-2)、(c-1)、(c-2)、(c-3)は、表1で用いている繰り返し単位の構造を示す。
赤外線を吸収するシアニン染料は、吸収した赤外線を熱に変換する機能と赤外線により励起して後述のラジカル重合性化合物に電子移動及び/又はエネルギー移動する機能を有する。本発明において使用されるシアニン染料は、波長760~1200nmに吸収極大を有する染料である。
具体的には、以下の構造のシアニン染料を挙げることができる。
本発明に用いられるジフェニルヨードニウム塩又はトリフェニルスルホニウム塩としては、(D)ラジカル重合性化合物の重合を開始、促進する化合物である。
ジフェニルヨードニウム塩としては、例えば、欧州特許第104、143号、米国特許出願公開第2008/0311520号の各明細書、特開平2-150848号、特開2008-195018号の各公報、又はJ.V.Crivello et al,Macromolecules,10(6),1307(1977)に記載のヨードニウム塩である。
トリフェニルスルホニウム塩としては、例えば、欧州特許第370,693号、同233,567号、同297,443号、同297,442号、米国特許第4,933,377号、同4,760,013号、同4,734,444号、同2,833,827号、独国特許第2,904,626号、同3,604,580号、同3,604,581号の各明細書に記載のスルホニウム塩が挙げられる。以下に、これらの化合物の具体例を示すが、これに限定されない。
具体例としては、ジフェニルヨードニウム=ヘキサフルオロホスファート、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、4-(2-メチルプロピル)フェニル-p-トリルヨードニウム=ヘキサフルオロホスファート、4-ヘキシルオキシフェニル-2,4,6-トリメトキシフェニルヨードニウム=ヘキサフルオロホスファート、4-ヘキシルオキシフェニル-2,4-ジエトキシフェニルヨードニウム=テトラフルオロボラート、4-オクチルオキシフェニル-2,4,6-トリメトキシフェニルヨードニウム=1-ペルフルオロブタンスルホナート、4-オクチルオキシフェニル-2,4,6-トリメトキシフェニルヨードニウム=ヘキサフルオロホスファート、ビス(4-t-ブチルフェニル)ヨードニウム=テトラフェニルボラートが挙げられる。
トリフェニルスルホニウム塩としては、例えば、トリフェニルスルホニウム=ヘキサフルオロホスファート、トリフェニルスルホニウム=ベンゾイルホルマート、ビス(4-クロロフェニル)フェニルスルホニウム=ベンゾイルホルマート、ビス(4-クロロフェニル)-4-メチルフェニルスルホニウム=テトラフルオロボラート、トリス(4-クロロフェニル)スルホニウム=3,5-ビス(メトキシカルボニル)ベンゼンスルホナート、トリス(4-クロロフェニル)スルホニウム=ヘキサフルオロホスファートが挙げられる。
本発明における画像記録層に用いるラジカル重合性化合物は、少なくとも一個のエチレン性不飽和二重結合を有する付加重合性化合物であり、末端エチレン性不飽和結合を少なくとも1個、好ましくは2個以上有する化合物から選ばれる。これらは、例えばモノマー、プレポリマー、すなわち2量体、3量体及びオリゴマー、又はそれらの混合物などの化学的形態をもつ。モノマーの例としては、不飽和カルボン酸(例えば、アクリル酸、メタクリル酸、イタコン酸、クロトン酸、イソクロトン酸、マレイン酸など)や、そのエステル類、アミド類が挙げられ、好ましくは、不飽和カルボン酸と多価アルコール化合物とのエステル、不飽和カルボン酸と多価アミン化合物とのアミド類が用いられる。また、ヒドロキシ基やアミノ基、メルカプト基等の求核性置換基を有する不飽和カルボン酸エステルあるいはアミド類と単官能若しくは多官能イソシアネート類あるいはエポキシ類との付加反応物、及び単官能若しくは、多官能のカルボン酸との脱水縮合反応物等も好適に使用される。また、イソシアネート基や、エポキシ基等の親電子性置換基を有する不飽和カルボン酸エステルあるいはアミド類と単官能若しくは多官能のアルコール類、アミン類、チオール類との付加反応物、更にハロゲン基や、トシルオキシ基等の脱離性置換基を有する不飽和カルボン酸エステルあるいはアミド類と単官能若しくは多官能のアルコール類、アミン類、チオール類との置換反応物も好適である。また、別の例として、上記の不飽和カルボン酸の代わりに、不飽和ホスホン酸、スチレン、ビニルエーテル等に置き換えた化合物群を使用することも可能である。これらは、特表2006-508380号公報、特開2002-287344号公報、特開2008-256850号公報、特開2001-342222号公報、特開平9-179296号公報、特開平9-179297号公報、特開平9-179298号公報、特開2004-294935号公報、特開2006-243493号公報、特開2002-275129号公報、特開2003-64130号公報、特開2003-280187号公報、特開平10-333321号公報、を含む参照文献に記載されている。
CH2=C(R4)COOCH2CH(R5)OH (A)
(ただし、R4及びR5は、H又はCH3を示す。)
本発明の画像記録層には、画像記録層の膜強度を向上させるため、バインダーポリマーを用いることができる。本発明に用いることができるバインダーポリマーは、従来公知のものを制限なく使用でき、皮膜性を有するポリマーが好ましい。なかでも、アクリル樹脂、ポリビニルアセタール樹脂、ポリウレタン樹脂が好ましい。
本発明における画像記録層には、必要に応じて、更に他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ヒドロキシ類、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、酸素遮断層に無機層状化合物を含有させる場合、これらの化合物は、無機層状化合物の表面被覆剤として機能し、無機層状化合物による印刷途中の着肉性低下を防止する。
30質量%ポリマー溶液3.33g(固形分として1g)を、20mlのメスフラスコに秤量し、N-メチルピロリドンでメスアップする。この溶液をウベローデ還元粘度管(粘度計定数=0.010cSt/s)に入れ、30℃にて流れ落ちる時間を測定し、計算式(「動粘度」=「粘度計定数」×「液体が細管を通る時間(秒)」)を用いて定法により算出した。
(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)
(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)
(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)
(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)
(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)
(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20/80)
(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)
(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)
(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)
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、無機層状化合物、及び共増感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[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。
本発明で用いる平版印刷版原版は酸素遮断層を有することが好ましい。酸素遮断層は、水溶性樹脂、並びに、ポリオキシアルキレン鎖を側鎖に有するポリマー微粒子、無機球状微粒子及び無機層状微粒子から選択される少なくとも一つを含有することが好ましい。酸素遮断層にも微粒子を含有することで、画像記録層に添加する場合より更に、リスフィルムの真空密着性が向上する。微粒子を添加する際、微粒子を結着させるために水溶性樹脂を含有させる必要がある。
微粒子を結着させるために水溶性樹脂しては、微粒子の分散性が良好であり、画像記録層に密着する均一な皮膜を形成し得るものであれば、特に制限はなく、適宜選択して使用することができる。具体的には例えば、ポリビニルアルコール、変性ポリビニルアルコール、ポリビニルピロリドン、ポリビニルイミダゾール、ポリアクリル酸、ポリアクリルアミド、ポリ酢酸ビニルの部分鹸化物、エチレン-ビニルアルコール共重合体、水溶性セルロース誘導体、ゼラチン、デンプン誘導体、アラビアゴム等が挙げられる。これらは、必要に応じて2種以上を併用して用いることもできる。なかでも、水を溶媒として塗布可能であり、かつ、印刷時における湿し水により容易に除去されるという観点から、ポリビニルアルコール、変性ポリビニルアルコール、ポリビニルピロリドン、ゼラチン、アラビアゴム等が更に好ましい。
具体的には、株式会社クラレ製のPVA-105,PVA-110,PVA-117,PVA-117H,PVA-120,PVA-124,PVA124H,PVA-CS,PVA-CST,PVA-HC,PVA-203,PVA-204,PVA-205,PVA-210,PVA-217,PVA-220,PVA-224,PVA-217EE,PVA-217E,PVA-220E,PVA-224E,PVA-405,PVA-420,PVA-613,L-8等が挙げられる。上記の共重合体としては、88~100モル%加水分解されたポリビニルアセテートクロロアセテート又はプロピオネート、ポリビニルホルマール及びポリビニルアセタール及びそれらの共重合体が挙げられる。
上記の画像記録層上に微粒子を含有する酸素遮断層を設けることで、より真空密着性が向上すると同時に、耐刷性がより良好となる。微粒子はポリオキシアルキレン鎖を側鎖に有するポリマー微粒子、無機球状微粒子、及び無機層状微粒子から選択される少なくとも一つである。ポリマー微粒子の場合、ポリオキシアルキレン鎖を側鎖に有するポリマー微粒子が、機上現像時のカス析出の抑制に点で好ましい。
酸素遮断層に用いるポリオキシアルキレン鎖を側鎖として有するポリマー微粒子としては前記画像記録層に用いられるのと同じポリマー微粒子が挙げられる。
無機球状微粒子としては、金属及び金属化合物、例えば、酸化物、複合酸化物、水酸化物、炭酸塩、硫酸塩、ケイ酸塩、リン酸塩、窒化物、炭化物、硫化物及びこれらの少なくとも2種以上の複合化物等が挙げられ、具体的には、ガラス、酸化亜鉛、シリカ、アルミナ、酸化ジルコン、酸化錫、チタン酸カリウム、チタン酸ストロンチウム、硼酸アルミニウム、酸化マグネシウム、硼酸マグネシウム、水酸化アルミニウム、水酸化マグネシウム、水酸化カルシウム、水酸化チタン、塩基性硫酸マグネシウム、炭酸カルシウム、炭酸マグネシウム、硫酸カルシウム、硫酸マグネシウム、ケイ酸カルシウム、ケイ酸マグネシウム、リン酸カルシウム、窒化珪素、窒化チタン、窒化アルミニウム、炭化珪素、炭化チタン、硫化亜鉛及びこれらの少なくとも2種以上の複合化物等が挙げられる。好ましくは、ガラス、シリカ、アルミナ、チタン酸カリウム、チタン酸ストロンチウム、硼酸アルミニウム、酸化マグネシウム、炭酸カルシウム、炭酸マグネシウム、ケイ酸カルシウム、ケイ酸マグネシウム、リン酸カルシウム、硫酸カルシウム等が挙げられる。
本発明においては、水溶性樹脂と併用して無機質の層状化合物を含有していてもよく、無機層状化合物とは、薄い平板状の形状を有する粒子であり、例えば、下記一般式
A(B,C)2-5D4O10(OH,F,O)2
〔ただし、AはK,Na,Caの何れか、B及びCはFe(II),Fe(III),Mn,Al,Mg,Vの何れかであり、DはSi又はAlである。〕で表される天然雲母、合成雲母等の雲母群、式3MgO・4SiO・H2Oで表されるタルク、テニオライト、モンモリロナイト、サポナイト、ヘクトライト、リン酸ジルコニウムなどが挙げられる。
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はく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。
下塗り層用の高分子樹脂は、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。
本発明の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。
紫外線としては、リスフィルムを介して画像露光していたコンベンショナルPS版の露光に用いられる平台露光機が好ましく適用されうる。このとき平台露光機に標準的に装備されている真空引きを行う。すなわち、平版印刷版原版を露光台に起き、その上にリスフィルムを置く。更にガラス又は透明フィルムなどの透明基材をリスフィルムの上に置き、真空引きを行い、ハロゲンランプ、又は水銀ランプなどによりUV露光する。真空度は100mmHg以下が好ましい。特に好ましくは30mmHg以下である。これは、ラジカル重合により画像形成する画像記録層の場合、大気中の酸素が重合阻害を起すためである。なお、酸素遮断層を設けることにより、大気中の酸素が重合阻害するのを抑制し、高耐刷化することができる。
本発明の平版印刷版原版の製版は機上現像方法で行う。機上現像方法は、平版印刷版原版を画像露光する工程と、露光後の平版印刷版原版になんらの現像処理を施すことなく、油性インキ及び水性成分の少なくともいずれかを供給して、印刷する印刷工程とを有し、該印刷工程の途上において平版印刷版原版の未露光部分が除去されることを特徴とする。画像露光は、高出力の赤外線半導体レーザーによる露光、及び、リスフィルムを置き、真空引きした後、高圧水銀灯、又は、メタルハライドランプによるUV露光の両方が可能である。露光後、平版印刷版原版は現像処理工程を経ないでそのまま印刷機に装着される。その後、該印刷機を用い、油性インキと水性成分とを供給してそのまま印刷することにより、印刷途上の初期の段階で機上現像処理、すなわち、未露光領域の画像記録層が除去され、それに伴って親水性支持体表面が露出され非画像部が形成される。油性インキ及び水性成分としては、通常の平版印刷用の印刷インキと湿し水が用いられる。
(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%硝酸水溶液に20秒間浸漬し、水洗した。この時の砂目立て表面のエッチング量は約3g/m2であった。
次に、この板に15質量%硫酸水溶液(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をバー塗布した後、100℃60秒でオーブン乾燥し、乾燥塗布量1.0g/m2の画像記録層を形成した。
画像記録層塗布液は下記画像記録層プレ塗布液及びポリマー微粒子水分散液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
・シアニン染料 〔例示化合物(A-7)〕 0.030g
・ラジカル重合開始剤(1)〔下記構造〕 0.162g
・ラジカル重合性化合物
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
下記ミクロゲル(1)に水を加え、固形分濃度を11.3質量%に調整した後、上記の画像記録層プレ塗布液に5.06g加え、画像記録層塗布液を作製した。
油相成分として、下記構造の多官能イソシアナート(三井化学ポリウレタン製;75質量%酢酸エチル溶液)4.46g、トリメチロールプロパン(6モル)とキシレンジイソシアナート(18モル)を付加させ、これにメチル片末端ポリオキシエチレン(1モル、なおオキシエチレン単位の繰り返し数は90)を付加させた付加体(三井化学ポリウレタン製;50質量%酢酸エチル溶液)0.86g、ペンタエリスリトールテトラアクリレート(サートマー製、SR399E)1.72g、及びパイオニンA-41C(竹本油脂製;メタノール70質量%溶液)0.05gを酢酸エチル4.46gに溶解した。油相成分及び水相成分としての水17.30gを混合し、ホモジナイザーを用いて10000rpmで15分間乳化した。得られた乳化物を、40℃で4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、21.8質量%になるように水を用いて希釈した。平均粒径は0.25μmであった。
実施例1のシアニン染料(A-7)及びラジカル重合開始剤(1)を表2に記載のように置き換え、平版印刷版原版(2)~(13)を作製した。
(1)UV露光
得られた平版印刷版原版(1080mm×800mm)の上にリスフィルム(900mm×600mm)を置き、PSライトで真空度25mmHgで30秒間減圧を行った後、30秒間露光した。
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。
(1)機上現像性及びカス付着
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Fusion-G(N)墨インキ(DIC(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、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。
更に、この操作を20版分繰返し、20版目の印刷物へのカスの付着を調べた。これらの結果を表3に示す。
上述した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。結果を表3に示す。
PSライト露光機の露光台上に1080mm×800mmの平版印刷版原版を置き、その上に900mm×600mmのリスフィルムを置き、PSライトのガラス版をかぶせ、25mmHgで真空引きを行った。その際の真空密着時間を測定した。真空密着時間は、平版印刷版原版とリスフィルムの間に空気溜りがなくなる時間を測定した。結果を表3に示す。
(1)画像記録層の形成
平版印刷版原版(14)~(17)及び(26)~(28)は、実施例1で用いたポリマー微粒子水分散液中のミクロゲル(1)を表4に記載の後述のミクロゲル又はポリマー微粒子に置き換えた以外は、実施例1と同様にして各画像記録層を形成した。ただし、微粒子水分散液は微粒子濃度を11.3質量%に調整して用いた。
油相成分として、上記構造の多官能イソシアナート(三井化学ポリウレタン製;75質量%酢酸エチル溶液)4.46g、トリメチロールプロパン(6モル)とキシレンジイソシアナート(18モル)を付加させ、これにメチル片末端ポリオキシエチレン(1モル、なおオキシエチレン単位の繰り返し数は90)を付加させた付加体(三井化学ポリウレタン製;50質量%酢酸エチル溶液)0.86g、カレンズMOI(昭和電工製)(2-メタクリロイルオキシエチルイソシアネート)0.5g、及びパイオニンA-41C(竹本油脂製;メタノール70%溶液)0.05gを酢酸エチル4.46gに溶解した。油相成分及び水相成分としての水17.30gを混合し、ホモジナイザーを用いて10000rpmで15分間乳化した。得られた乳化物を、40℃で4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、21.8質量%になるように水を用いて希釈した。平均粒径は0.25μmであった。
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(三井化学ポリウレタン(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、及びパイオニンA-41C(竹本油脂(株)製)0.1gを酢酸エチル17gに溶解した。水相成分としてクラレポバールPVA-205((株)クラレ製ポリビニルアルコール)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、これを前記ミクロゲル(3)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。
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。
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メチルメタクリレート(MMA)90g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/MMA=10/90のポリマー微粒子水分散液(2)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。
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、アリルメタクリレート(AllylMA)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)70g、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/AllylMA/AN/St=10/10/70/10のポリマー微粒子水分散液(3)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。
メチルメタクリレート15.0g、ポリオキシエチレンフェノール水溶液(濃度9.8×10-3mol/リットル)100mlを加え、250rpmでかき混ぜながら、系内を窒素ガスで置換した。この液を25℃にした後、セリウム(IV)アンモニウム塩水溶液(濃度0.984×10-3mol/リットル)10ml添加した。この際硝酸アンモニウム水溶液(濃度58.8×10-3mol/リットル)を加え、pH1.3~1.4に調整した。その後8時間これを攪拌した。このようにして得られた液の固形分濃度は13.0質量%であり、平均粒径は0.2μmであった。
平版印刷版原版(18)及び(22)は、下記のように作成した酸素遮断層用塗布液を塗布することにより酸素遮断層を形成した。
平版印刷版原版(19)~(21)、(23)~(25)及び(29)~(32)は、平版印刷版原版(18)を作成した酸素遮断層用塗布液に、更に表4に記載の微粒子の水分散液を添加し、酸素遮断層を形成した。ただし、微粒子水分散液は微粒子濃度を3.2質量%に調整して用いた。
・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
0.30g
・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
・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
0.30g
・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
・微粒子水分散液(微粒子濃度を3.2質量%に調整)1.5g
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。(無機球状微粒子分散液(1)の調製)
イオン交換水393.6gに平均粒子450nmであるシリカ微粒子であるスノーテックスMP4540M 日産化学(株)製 固形分濃度 40質量%)6.4g添加し、分散した。
実施例1と同様に露光を行い、平版印刷版原版の評価を行った。結果を表5に示す。
本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
本出願は、2010年3月30日出願の日本特許出願(特願2010-79921)及び2011年2月2日出願の日本特許出願(特願2011-21229)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 (7)
- (1)支持体と、シアニン染料、フェニル基上に置換基を有していてもよいジフェニルヨードニウム塩又はトリフェニルスルホニウム塩、ラジカル重合性化合物及びポリオキシアルキレン鎖を側鎖に有するポリマー微粒子を含有する画像記録層とをこの順に有する、波長760~1200nmの赤外線を放射する半導体レーザーによる画像形成が可能な平版印刷版原版を準備し、(2)平版印刷版原版の上にリスフィルムを置き、減圧することによりリスフィルムと平版印刷版原版を密着させ、(3)UV露光を行い、(4)印刷機上のシリンダに取り付け、湿し水及びインキの少なくともいずれかにより、非画像部の画像記録層を除去することを特徴とする平版印刷版の製版方法。
- 画像記録層の上に酸素遮断層を有することを特徴とする請求項1に記載の平版印刷版の製版方法。
- 酸素遮断層が、水溶性樹脂、並びに、ポリオキシアルキレン鎖を側鎖に有するポリマー微粒子、無機球状微粒子及び無機層状微粒子から選択される少なくとも一つを含有することを特徴とする請求項2に記載の平版印刷版の製版方法。
- ポリオキシアルキレン鎖を側鎖に有するポリマー微粒子がミクロゲルであることを特徴とする、請求項1~3のいずれか1項に記載の平版印刷版の製版方法。
- 無機球状微粒子が、シリカ微粒子であることを特徴とする請求項3に記載の平版印刷版の製版方法。
- 無機層状微粒子が、雲母であることを特徴とする請求項3に記載の平版印刷版の製版方法。
- (1)支持体と、シアニン染料、フェニル基上に置換基を有していてもよいジフェニルヨードニウム塩又はトリフェニルスルホニウム塩、ラジカル重合性化合物及びポリオキシアルキレン鎖を側鎖に有するポリマー微粒子を含有する波長760~1200nmの赤外線を放射する半導体レーザーによる画像形成が可能な画像記録層とをこの順に有する平版印刷版原版を準備し、(2)平版印刷版原版の上にリスフィルムを置き、減圧することによりリスフィルムと平版印刷版原版を密着させ、(3)UV露光を行い、(4)印刷機上のシリンダに取り付け、湿し水及びインキの少なくともいずれかにより非画像部の画像記録層を除去し、(5)印刷することを特徴とする平版印刷版の印刷方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112012024695-0A BR112012024695A2 (pt) | 2010-03-30 | 2011-03-18 | método de produção de placa de impressão litográfica |
US13/638,437 US20130014657A1 (en) | 2010-03-30 | 2011-03-18 | Plate making method of lithographic printing plate |
EP11762611.9A EP2554381B1 (en) | 2010-03-30 | 2011-03-18 | Method for producing lithographic printing plate |
CN201180016890.XA CN102834264B (zh) | 2010-03-30 | 2011-03-18 | 平版印刷版的制版方法 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-079921 | 2010-03-30 | ||
JP2010079921 | 2010-03-30 | ||
JP2011-021229 | 2011-02-02 | ||
JP2011021229 | 2011-02-02 |
Publications (1)
Publication Number | Publication Date |
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WO2011122378A1 true WO2011122378A1 (ja) | 2011-10-06 |
Family
ID=44712089
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/056634 WO2011122378A1 (ja) | 2010-03-30 | 2011-03-18 | 平版印刷版の製版方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130014657A1 (ja) |
EP (1) | EP2554381B1 (ja) |
JP (1) | JP5439422B2 (ja) |
CN (1) | CN102834264B (ja) |
BR (1) | BR112012024695A2 (ja) |
WO (1) | WO2011122378A1 (ja) |
Cited By (1)
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---|---|---|---|---|
WO2015122513A1 (ja) * | 2014-02-17 | 2015-08-20 | 富士フイルム株式会社 | 平版印刷版の基準マーク検出方法、平版印刷版の加工方法、及び、印刷方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP3845394A4 (en) * | 2018-08-31 | 2021-10-27 | FUJIFILM Corporation | ORIGINAL FLAT PRINTING PLATE, METHOD OF MANUFACTURING A FLAT PRINTING PLATE, FLAT PRINTING PROCESS AND CURING COMPOSITION |
JP7562527B2 (ja) * | 2019-06-28 | 2024-10-07 | 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 |
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