WO2017018262A1 - 平版印刷版原版、平版印刷版の作製方法、及び、有機-無機ハイブリッド粒子 - Google Patents
平版印刷版原版、平版印刷版の作製方法、及び、有機-無機ハイブリッド粒子 Download PDFInfo
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- WO2017018262A1 WO2017018262A1 PCT/JP2016/071067 JP2016071067W WO2017018262A1 WO 2017018262 A1 WO2017018262 A1 WO 2017018262A1 JP 2016071067 W JP2016071067 W JP 2016071067W WO 2017018262 A1 WO2017018262 A1 WO 2017018262A1
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- printing plate
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- LAEJIJKHFICDFF-UHFFFAOYSA-N CC1(C)c(cc(C)cc2)c2[N+](CCCOC)=C1/C=C/C(CC/C1=C\C=C2\N(CCCOC)c3ccc(C)cc3C2(C)C)=C1N(c1ccccc1)c1ccccc1 Chemical compound CC1(C)c(cc(C)cc2)c2[N+](CCCOC)=C1/C=C/C(CC/C1=C\C=C2\N(CCCOC)c3ccc(C)cc3C2(C)C)=C1N(c1ccccc1)c1ccccc1 LAEJIJKHFICDFF-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/0047—Photosensitive materials characterised by additives for obtaining a metallic or ceramic pattern, e.g. by firing
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
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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
-
- 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
- G03F7/075—Silicon-containing compounds
- G03F7/0757—Macromolecular compounds containing Si-O, Si-C or Si-N bonds
- G03F7/0758—Macromolecular compounds containing Si-O, Si-C or Si-N bonds with silicon- containing groups in the side chains
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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
- G03F7/16—Coating processes; Apparatus therefor
- G03F7/162—Coating on a rotating support, e.g. using a whirler or a spinner
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
- G03F7/2006—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light using coherent light; using polarised light
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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
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/322—Aqueous alkaline compositions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/06—Developable by an alkaline 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
- B41C2210/08—Developable by water or the fountain solution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/10—Developable by an acidic solution
Definitions
- the present invention relates to a so-called lithographic printing plate precursor capable of direct plate making from various digital signals from a computer or the like, a method for producing a lithographic printing plate using the same, and an organic-inorganic hybrid used in these Concerning particles.
- Solid-state lasers, semiconductor lasers, and gas lasers that emit ultraviolet light, visible light, and infrared light with wavelengths of 300 nm to 1200 nm are easily available in high output and small size. It is very useful as a recording light source when making a plate directly from digital data.
- Various studies have been conducted on recording materials that are sensitive to these various laser beams.
- a material that can be recorded with an infrared laser having a photosensitive wavelength of 760 nm or more there is an advantage that handling in a bright room becomes easy.
- a radical polymerization type negative recording material described in Patent Document 1 Etc described in Patent Document 1 Etc.
- a step (development processing) for dissolving and removing the non-image part is indispensable, and the developed printing plate is washed with water
- a post-treatment step is also necessary, in which treatment is performed with a rinse solution containing a surfactant or treatment with a desensitizing solution containing gum arabic or a starch derivative.
- one method of eliminating the processing step is to mount the exposed printing original plate on the cylinder of the printing press, and supply dampening water and ink while rotating the cylinder to remove the non-printing original plate.
- thermoplastic hydrophobic polymer fine particles are dispersed in a hydrophilic binder polymer is provided on a hydrophilic support.
- On-press development can be performed by supplying at least one of water and ink.
- This lithographic printing plate precursor also has handleability in a bright room because the photosensitive region is an infrared region.
- an image formed by coalescence (fusion) of thermoplastic hydrophobic polymer fine particles has insufficient strength and has a problem in printing durability as a printing plate.
- a lithographic printing plate precursor including microcapsules encapsulating a polymerizable compound in place of the thermoplastic fine particles has been proposed (see, for example, Patent Document 2).
- the original plate according to such a proposal has an advantage that the polymer image formed by the reaction of the polymerizable compound is superior in strength to the image formed by fusing fine particles.
- the polymerizable compound since the polymerizable compound has high reactivity, many methods for isolating it using microcapsules have been proposed. It has been proposed to use a thermally decomposable polymer for the shell of the microcapsule.
- the present invention has been made in view of the above circumstances, and the object thereof is a lithographic printing plate precursor capable of achieving both high printing durability and developability at a high level, and a method for producing a lithographic printing plate using the same. And providing organic-inorganic hybrid particles used in these.
- the present invention has the following configuration, which solves the above-described problems of the present invention.
- a lithographic printing plate precursor having an image recording layer containing (A) organic-inorganic hybrid particles and (B) an infrared absorber on a hydrophilic support, wherein the (A) organic-inorganic hybrid particles are A lithographic printing plate precursor, which is an organic-inorganic hybrid particle in which (a) an inorganic particle having a hydroxyl group and (b) an organic component are linked via a linking group having (c) a urethane bond or a urea bond.
- the (b) organic component is linked to at least two (a) inorganic particles, and the (a) inorganic particles are at least two (b) organic components.
- the (a) inorganic particles are at least one selected from the group consisting of silica, alumina, titania, zirconia, magnesium oxide, zinc oxide, talc, clay, wollastonite, zonolite, aluminum hydroxide, and magnesium hydroxide.
- the image recording layer further comprises (C) a radical polymerizable compound and (D) a radical polymerization initiator.
- the image recording layer has an unexposed portion removed by a developer having a pH of 2 to 12 after exposure.
- -Inorganic hybrid particles [17] The organic-inorganic hybrid particle according to [16], wherein the organic component (b) is a reaction product of (d) a polyfunctional isocyanate and (e) a compound having an active hydrogen atom.
- X represents an oxygen atom, a sulfur atom, —CO— or —COO—.
- R 1 represents alkylene having 2 to 10 carbon atoms.
- n 1 is 1 to 90.
- a lithographic printing plate precursor capable of achieving both high printing durability and developability at a high level, a method for preparing a lithographic printing plate using the same, and organic-inorganic hybrid particles used therefor. .
- R represents an alkyl group, an aryl group or a heterocyclic group
- R represents an unsubstituted alkyl group, a substituted alkyl group, an unsubstituted aryl group, a substituted aryl group, an Represents a substituted heterocyclic group or a substituted heterocyclic group.
- (meth) acrylic acid ester represents the concept containing both methacrylic acid ester and acrylic acid ester, for example.
- the “particle diameter” represents the average particle diameter of primary particles unless otherwise specified. In the present invention, the particle diameter of the particles can be measured by a light scattering method.
- the lithographic printing plate precursor according to the present invention is a lithographic printing plate precursor having an image recording layer containing (A) organic-inorganic hybrid particles and (B) an infrared absorber on a hydrophilic support, (A) Organic-inorganic hybrid particles in which (a) inorganic particles having a hydroxyl group and (b) an organic component are linked via a linking group having (c) a urethane bond or a urea bond Particles.
- an undercoat layer can be provided between the support and the image recording layer, and a protective layer can be provided on the image recording layer, if necessary.
- the organic-inorganic hybrid particles contained in the image recording layer include (a) inorganic particles having a hydroxyl group and (b) an organic component via (c) a linking group having a urethane bond or a urea bond.
- the linking group having a urethane bond or a urea bond is typically linked to the inorganic particle in a form that replaces a hydrogen atom in the hydroxyl group of the inorganic particle.
- the mechanism of action that provides such excellent characteristics is not necessarily clear, but is considered as follows. That is, firstly, since the inorganic particles in the organic-inorganic hybrid particles have high hardness, it is considered that the printing durability of the image area is improved. Furthermore, since the inorganic particles are connected to the organic component through a linking group having a high strength urethane bond or urea bond, it is considered that this also provides high printing durability. Further, since the inorganic particles are fixed in the organic-inorganic hybrid particles, the inorganic particles are less likely to agglomerate, and the inorganic particles are more likely to be uniformly present in the image area. It is considered that sufficient printing durability can be expressed without adding a large amount of particles. That is, it is considered that printing durability and developability can be achieved at a high level.
- the inorganic particles in the inorganic particles having a hydroxyl group are selected from the group consisting of silica, alumina, titania, zirconia, magnesium oxide, zinc oxide, talc, clay, wollastonite, zonolite, aluminum hydroxide, and magnesium hydroxide. It is preferably at least one kind of particles selected, preferably silica or zirconia, and more preferably silica.
- the particle size of the inorganic particles is preferably 0.005 to 5 ⁇ m, more preferably 0.01 to 2 ⁇ m, and still more preferably 0.01 to 1 ⁇ m.
- Examples of the organic component include non-aromatic hydrocarbons (linear, branched, or cyclic), aromatic hydrocarbons, aromatic heterocycles, non-aromatic heterocycles, and at least two of these The component corresponding to a combination can be mentioned.
- the non-aromatic hydrocarbon (linear, branched or cyclic), aromatic hydrocarbon, aromatic heterocycle and non-aromatic heterocycle may have a substituent.
- “having a substituent” means that any atom (typically a hydrogen atom or a carbon atom) constituting the organic component is substituted with a substituent.
- substituents examples include a halogen atom, an alkyl group (which may be linear or branched, and preferably 1 to 12 carbon atoms), and a cycloalkyl group (monocyclic, polycyclic or spirocyclic).
- a halogen atom an alkyl group (which may be linear or branched, and preferably 1 to 12 carbon atoms), and a cycloalkyl group (monocyclic, polycyclic or spirocyclic).
- aryl group preferably having 6 to 14 carbon atoms
- hydroxy group cyano group, alkoxy group, ester bond, amide bond, urethane bond, urea bond, ureido group, ether bond
- Examples thereof include a thioether bond, a sulfonamide bond, a sulfonate bond, and a group formed by combining two or more selected from these bonds and groups.
- (A) Method for producing organic-inorganic hybrid particles As a method for producing organic-inorganic hybrid particles, first, with respect to inorganic particles having a hydroxyl group, a reactive group capable of reacting with a hydroxyl group contained in the inorganic particle and an organic component have a linking group having a urethane bond or a urea bond. And a method of reacting a compound having an organic component and an isocyanate group with an inorganic particle having a hydroxyl group.
- Examples of the reactive group capable of reacting with the hydroxyl group of the inorganic particles include an alkyloxysilyl group, a chlorosilyl group, a bromosilyl group, an iodosilyl group, and a group formed by substituting a hydrogen atom in an acid group with a chlorine atom.
- the organic-inorganic hybrid particle is a particle in which an organic component is linked to only one inorganic particle.
- the organic-inorganic hybrid particles in this form can be produced based on, for example, the following reaction schemes (A-1) and (A-2).
- n in the following reaction scheme represents the repeating number of an alkyleneoxy structure.
- the organic-inorganic hybrid particles may be in the form of a microgel that is suitably obtained based on a known interfacial polymerization reaction. That is, the microgel in the present invention is a fine particle in which inorganic particles are fixed through a linking group having a urethane bond or a urea bond in the microgel.
- a compound having an amino group and a reactive group capable of reacting with the hydroxyl group of the inorganic particle is reacted with the inorganic particle having a hydroxyl group.
- microgel preparation material in which inorganic particles having a hydroxyl group and an organic component are bonded via a linking group having a urethane bond or a urea bond by reacting with a polyfunctional isocyanate. Thereafter, organic-inorganic hybrid particles in the form of a microgel can be suitably obtained by using this microgel preparation material.
- the said microgel preparation material has a reactive group for forming a microgel in the said organic component, and an isocyanate group can be mentioned suitably as such a reactive group.
- a surfactant may be added to either the oil phase or the aqueous phase, but it is easier to add to the aqueous phase because of its low solubility in organic solvents.
- the addition amount is preferably 0.1 to 5% by mass, particularly 0.5 to 2% by mass, based on the mass of the oil phase.
- surfactants used for emulsification and dispersion are considered to be superior surfactants having a relatively long-chain hydrophobic group. “Surfactant Handbook” (Nishi Ichiro et al., Sangyo Tosho (1980)), alkyl Alkali metal salts such as sulfonic acid and alkylbenzene sulfonic acid can be used.
- compounds such as a formalin condensate of aromatic sulfonate and a formalin condensate of aromatic carboxylate may be used as the surfactant (emulsification aid).
- specific examples include compounds represented by the following general formula. This compound is described in JP-A No. 06-297856.
- R represents an alkyl group having a carbon number of 1 ⁇ 4
- X is SO 3 - or COO - represents
- M represents Na + or K +
- q is an integer of 1-20.
- Alkyl glucoside compounds can also be used in the same manner. Specific examples include compounds represented by the following general formula.
- R represents an alkyl group having 4 to 18 carbon atoms
- q represents an integer of 0 to 2.
- Surfactants may be used alone or in combination of two or more.
- organic-inorganic hybrid particles in the form of a microgel can be produced.
- n in the following reaction scheme means that n structures shown in parentheses are bonded to silica particles.
- the organic-inorganic hybrid particle has an organic component connected to at least two inorganic particles, an inorganic particle connected to at least two organic components, and the organic component and the inorganic particles are networked. Particles having a structure are preferred, and this makes it possible to further improve printing durability without deteriorating developability.
- the organic component is preferably a reaction product of a polyfunctional isocyanate and a compound having an active hydrogen atom.
- the polyfunctional isocyanate is preferably formed from an adduct of a polyfunctional isocyanate and a compound having at least two active hydrogen atoms.
- the organic-inorganic hybrid particles are typically in the form of a microgel and can be produced according to conventionally known methods for forming microcapsules.
- the microcapsule formation method is described in detail in “Microcapsule” (Kondo Asahi, Nikkan Kogyo Shimbun (1970)) and “Microcapsule” (Kondo Yasu et al., Sankyo Publishing (1977)).
- a compound in which a reactive group capable of reacting with a hydroxyl group of an inorganic particle and an organic component are bonded to the inorganic particle via a linking group having a urethane bond or a urea bond.
- this microgel preparation material has a reactive group for forming a microgel in the organic component, and examples of such a reactive group include an isocyanate group.
- a microgel preparation material containing inorganic particles and a polyfunctional isocyanate compound are added to an organic solvent, the organic phase solution is emulsified in a water-soluble polymer aqueous solution, and then the polymerization reaction is promoted to the aqueous phase.
- a microgel By adding the above catalyst or raising the temperature of the emulsion to polymerize the polyfunctional isocyanate compound with the above-mentioned compound having active hydrogen atoms (such as water), a microgel can be formed.
- the microgel microcapsule which includes the structural component of an image recording layer by adding the structural component of an image recording layer in this organic phase solution.
- a radical polymerizable compound is particularly preferable.
- polyfunctional isocyanate compound examples include xylene diisocyanate and hydrogenated products thereof, hexamethylene diisocyanate, tolylene diisocyanate and hydrogenated products thereof, and diisocyanates such as isophorone diisocyanate. And known compounds. Further, these compounds as main raw materials, these trimers (burette or isocyanurate), polyfunctional adducts (adducts) with polyols such as trimethylol propane, formalin condensate of benzene isocyanate Etc. can also be used.
- xylene diisocyanate tolylene diisocyanate, and isophorone diisocyanate are particularly preferable. These compounds are described in “Polyurethane Resin Handbook” (edited by Keiji Iwata, published by Nikkan Kogyo Shimbun (1987)).
- water is generally used as a compound having an active hydrogen atom that reacts with a polyfunctional isocyanate compound for forming a microgel wall during microgelation.
- Polyols can also be used as compounds having active hydrogen atoms.
- the polyol is used by being added to an oil phase as a core or an aqueous phase containing a water-soluble polymer as a dispersion medium.
- Specific examples include propylene glycol, glycerin, and trimethylolpropane.
- amine compounds such as diethylenetriamine and tetraethylenepentamine may be used instead of or in combination with polyol. These compounds are also described in the above “Polyurethane Resin Handbook”.
- Water-soluble polymers for dispersing the oil phase of the microgel in the aqueous phase include polyvinyl alcohol and its modified products, polyacrylic acid amide and its derivatives, ethylene / vinyl acetate copolymer, styrene / maleic anhydride copolymer Polymer, ethylene / maleic anhydride copolymer, isobutylene / maleic anhydride copolymer, polyvinylpyrrolidone, ethylene / acrylic acid copolymer, vinyl acetate / acrylic acid copolymer, carboxymethylcellulose, methylcellulose, casein, gelatin, starch Mention may be made of derivatives, arabic gum and sodium alginate. These water-soluble polymers are preferably those that do not react with isocyanate compounds or that are extremely difficult to react. For example, those having a reactive amino group in the molecular chain such as gelatin may be pre-removed. is necessary.
- examples of surfactants that are usually used and the amount of addition thereof are the same as those described above.
- the organic component in the form of a microgel, is connected to at least two inorganic particles, and the inorganic particle is connected to at least two organic components.
- organic-inorganic hybrid particles in which organic components and inorganic particles form a network structure can be produced.
- n in the reaction scheme below means that n structures shown in parentheses are bonded to silica particles, m represents the number of repetitions of the structure shown in parentheses, and * is Represents a bond that bonds with other * in the organic component.
- the organic component preferably has a repeating unit represented by the following general formula (1).
- X represents an oxygen atom, a sulfur atom, —CO— or —COO—.
- R 1 represents alkylene having 2 to 10 carbon atoms.
- n 1 is 1 to 90.
- the particle strength is decreased due to the decrease in the glass transition temperature of the organic-inorganic hybrid particles, and at the same time the ink Affinity for is improved.
- the on-press development property is improved, and the on-press development can easily proceed well even in the extremely low exposure region of the non-image area.
- the polymerization efficiency of the radical polymerizable compound is improved, whereby the image strength is improved and high printing durability is easily achieved.
- Examples of the method for introducing the repeating unit represented by the general formula (1) into the organic component of the organic-inorganic hybrid particle include, for example, the above-mentioned “reactive group capable of reacting with the hydroxyl group of the inorganic particle, the organic component, Is a repeating unit represented by the general formula (1) in the organic component in the “compound bonded via a linking group having a urethane bond or a urea bond” and the “compound having an organic component and an isocyanate group”.
- the organic component contains the repeating unit represented by the general formula (1)
- the microgel preparation A compound having a group capable of reacting with the “reactive group for forming a microgel” of the material for use and a repeating unit represented by the general formula (1) Kurogeru when fabricated, and a method for present with the microgel fabrication materials.
- the organic component in the organic-inorganic hybrid particles is represented by the general formula (1). It is an example with units.
- the organic-inorganic hybrid particles preferably have a radical polymerizable group from the viewpoint of image forming sensitivity and printing durability.
- the form in which the organic-inorganic hybrid particles have a radically polymerizable group includes radically polymerizable as in the above reaction schemes (A-1), (A-2), (A-5), and (A-6). Examples include a form in which a group is bonded to an organic component in an organic-inorganic hybrid particle, and a form in which a radical polymerizable compound is taken into a microgel as a microcapsule as in the above reaction scheme (A-7). it can.
- R 1 to R 3 each represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 20 carbon atoms, an aryl group, an alkoxy group, or an aryloxy group; R 1 and R 2 or R 3 may be bonded to each other to form a ring, n represents an integer of 1 to 10, and X represents a dicyclopentadienyl residue.
- R 1 to R 3 each
- a radical polymerizable group capable of reacting with a hydroxyl group possessed by an inorganic particle and an organic component having a linking group having a urethane bond or a urea bond.
- a radically polymerizable compound having a group, or (ii) a radically polymerizable compound having a radically polymerizable group but different from the radically polymerizable compound (i) is present together with the material for producing a microgel at the time of producing the microgel.
- the method of making it, etc. are mentioned.
- the radical polymerization compound (i) is used as the polymerizable compound, whereby the reaction schemes (A-5) and ( As in A-6), a form in which a radical polymerizable group is bonded to an organic component in an organic-inorganic hybrid particle can be preferably produced.
- the radical polymerizable compound (ii) a form in which the radical polymerizable compound is taken into the inside of the microgel as a microcapsule as shown in the reaction scheme (A-7) is preferably produced. it can.
- the radical polymerizable compound (i) having a group capable of reacting with the “reactive group for forming a microgel” of the microgel preparation material is represented by the following general formula (b).
- Preferred examples of the compound are as follows.
- L 1 is an m + n-valent linking group, m and n are each independently an integer of 1 to 100, Lc is a monovalent ethylenically unsaturated group, and , Z is a nucleophilic group.
- L 1 represents a divalent or higher valent aliphatic group, a divalent or higher aromatic group, a divalent or higher heterocyclic group, —O—, —S—, —NH—, —N ⁇ , —CO—, —SO. It is preferably —, —SO 2 — or a combination thereof.
- n and n are each independently preferably an integer of 1 to 50, more preferably an integer of 1 to 20, still more preferably an integer of 1 to 10, and an integer of 1 to 5 Most preferably it is. Among these, it is particularly preferable that m is an integer of 1 to 3 and n is 1.
- Examples of the monovalent ethylenically unsaturated group represented by Lc include an allyl group, a vinyl group, an acryloyl group, and a methacryloyl group.
- Z is, OH, is preferably SH or NH 2, more preferably OH or NH 2, and most preferably is OH.
- a radical polymerizable compound in a method in which a radical polymerizable compound is present together with the material for preparing a microgel at the time of preparing the microgel, two or more kinds of radically polymerizable compounds may be used in combination.
- the radically polymerizable compound (i) and, if necessary, a compound having an active hydrogen atom are allowed to coexist with the polyfunctional isocyanate.
- An adduct to which a radical polymerizable compound is added can also be formed.
- the radically polymerizable compound (i) has a reactive group (for example, an isocyanate group) that reacts in the formation of a microgel
- a reactive group for example, an isocyanate group
- the radically polymerizable compound (i) may be added to the product (the adduct may be modified).
- an adduct obtained by adding the radical polymerizable compound (i) to the polyfunctional isocyanate and an adduct obtained by adding a compound having an active hydrogen atom to the polyfunctional isocyanate can be used in combination.
- organic-inorganic hybrid particles having hydrophilic polymer in side chain are preferably in the form of organic-inorganic hybrid particles having a hydrophilic polymer functioning as a protective colloid as a side chain on the surface thereof.
- hydrophilic polymer having one or more active hydrogen groups at one end A hydrophilic polymer having at least one active hydrogen group capable of reacting with an isocyanate group at one end will be described.
- the active hydrogen group capable of reacting with an isocyanate group include a hydroxy group, an amino group, a mercapto group, and a carboxy group. Of these, a hydroxy group and an amino group are particularly preferable.
- the hydrophilic polymer having such an active hydrogen group is not particularly limited, and examples thereof include a compound having a polyoxyalkylene chain having an active hydrogen group at one end.
- the mass average molar mass (Mw) of the hydrophilic polymer is preferably 300 to 500,000, and more preferably 500 to 100,000. When Mw is from 300 to 500,000, it has a sufficient function as a protective colloid, can ensure the dispersion stability of the polymer fine particles, and can sufficiently obtain the hydrophilicity of the surface.
- examples of the compound having a polyoxyalkylene chain include polyethylene oxide and ethylene oxide / propylene oxide copolymer. These polymers are, for example, ring-opening polymerization of a cyclic compound such as ethylene oxide and propylene oxide using alcohol, alkoxide, carboxylic acid, carboxylate, etc. as a polymerization initiation terminal, and the polymerization initiation terminal at a conventionally known reaction (eg, hydrolysis reaction). , Reduction reaction, etc.) can be synthesized by converting into an active hydrogen group such as a hydroxy group or an amino group. A polyether having an active hydrogen group at one end can also be used.
- polyethylene oxide monoethers examples include monomethyl ether, monoethyl ether, etc.
- polyethylene oxide monoesters examples include monoacetic acid esters, mono (meth) acrylic acid esters) Etc.
- polyether derivatives having a terminal amino group or a terminal hydroxy group represented by the following general formula (c) are preferable.
- X represents a linking group.
- Preferred linking groups include —C ( ⁇ O) — or SO 2 —. Of these, —C ( ⁇ O) — is preferable.
- m represents 0 or 1.
- A represents an arylene group or an alkylene group.
- Y represents an amino group or a hydroxy group.
- the arylene group represented by A may have a substituent, is preferably an arylene group having 6 to 30 carbon atoms, and particularly preferably an arylene group having 6 to 20 carbon atoms.
- the substituent is preferably a halogen atom, an alkyl group, an alkoxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, or a cyano group, and particularly preferably an alkyl group or an alkoxy group.
- Specific examples of such an arylene group include a phenylene group, a biphenylene group, a naphthylene group, a tolylene group, and a (methoxy) phenylene group.
- the alkylene group represented by A is preferably an alkylene group having 1 to 30 carbon atoms, and particularly preferably an alkylene group having 1 to 20 carbon atoms.
- Specific examples of such an alkylene group include a methylene group, an ethylene group, a propylene group, and a tetramethylene group.
- L represents an alkylene group.
- the alkylene group represented by L may have a substituent or may have a branch, and is preferably an alkylene group having 2 to 20 carbon atoms, particularly 2 to 2 carbon atoms. Ten alkylene groups are preferred.
- the substituent is preferably an aryl group, an alkenyl group, an alkoxy group, or an acyl group, and particularly preferably an aryl group.
- an alkylene group examples include an ethylene group, a propylene group, a tetramethylene group, a phenylethylene group, a cyclohexylene group, a vinylethylene group, and a phenoxymethylethylene group, and an ethylene group and a propylene group are particularly preferable. Most preferably, it is an ethylene group.
- the repeating unit — (L—O) n — may have L independent in each of n repeating units, but it is particularly preferable that the Ls are the same.
- the polyether having such a repeating unit include polyethylene oxide, polypropylene oxide, polytetramethylene oxide, polystyrene oxide, polycyclohexylene oxide, polyethylene oxide-polypropylene oxide-block copolymer, polyethylene oxide-polypropylene oxide. A random copolymer etc. are mentioned. Of these, polyethylene oxide, polypropylene oxide, polyethylene oxide-polypropylene oxide block copolymer are preferable, and polyethylene oxide is most preferable.
- R represents an organic group having no active hydrogen.
- R is not particularly limited as long as it is an organic group having no active hydrogen that reacts with an isocyanate group, and preferred organic groups include alkyl groups, aryl groups, and acyl groups. More preferred are an alkyl group, an aryl group, and an acyl group.
- the alkyl group represented by R preferably has a total carbon number of 1 to 30, and particularly preferably has a total carbon number of 1 to 20.
- Specific examples of such an alkyl group include a methyl group, an ethyl group, a butyl group, an isopropyl group, a benzyl group, an allyl group, an oleyl group, and a methoxyethyl group.
- a methyl group is most preferred.
- aryl group represented by R those having a total carbon number of 6 to 30 are preferable, and those having a total carbon number of 6 to 20 are particularly preferable.
- Specific examples of such an aryl group include a phenyl group, a nonylphenyl group, an octylphenyl group, and a methoxyphenyl group.
- the acyl group represented by R may be an aliphatic or aromatic acyl group, may have a substituent, may further have a branch, and has a total carbon number of 2 to 30. In particular, those having a total carbon number of 2 to 20 are preferred. Specific examples of such an acyl group include an acetyl group, a benzoyl group, a (meth) acryloyl group, an oleoyl group, a lauroyl group, a stearoyl group, and a methoxybenzoyl group.
- an alkyl group is preferable.
- n represents an average addition mole number of the polyether group and represents a number of 10 to 120, and the average addition mole number is preferably a number of 12 to 100.
- polyether derivative having a terminal amino group or a terminal hydroxy group represented by the general formula (c) are shown below, but the present invention is not limited thereto.
- the particle size of the organic-inorganic hybrid particles is preferably from 0.01 to 20 ⁇ m, more preferably from 0.05 to 5 ⁇ m, still more preferably from 0.1 to 1 ⁇ m.
- the content of the organic-inorganic hybrid particles is preferably 5 to 90% by mass, more preferably 10 to 80% by mass, and more preferably 20 to 60% by mass with respect to the total solid content of the image recording layer. More preferably.
- the image recording layer contains an infrared absorber.
- the infrared absorber is preferably a sensitizing dye having a maximum absorption in a wavelength region of 750 to 1400 nm.
- a dye or a pigment is preferably used as the infrared absorber.
- dyes such as azo dyes, metal complex azo dyes, pyrazolone azo dyes, naphthoquinone dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, quinoneimine dyes, methine dyes, cyanine dyes, squarylium dyes, pyrylium salts, metal thiolate complexes Is mentioned.
- cyanine dyes particularly preferred among these dyes are cyanine dyes, squarylium dyes, pyrylium salts, nickel thiolate complexes, and indolenine cyanine dyes. Further, cyanine dyes and indolenine cyanine dyes are preferred, and particularly preferred examples include cyanine dyes represented by the following general formula (a).
- X 131 represents a hydrogen atom, a halogen atom, —NPh 2 , —X 132 -L 131 or a group shown below.
- Ph represents a phenyl group.
- X 132 represents an oxygen atom, a nitrogen atom or a sulfur atom
- L 131 represents a hydrocarbon group having 1 to 12 carbon atoms, an aryl group having a hetero atom (N, S, O, halogen atom, Se), A hydrocarbon group having 1 to 12 carbon atoms including a hetero atom is shown.
- X a - is Z a to be described later - which is synonymous with.
- R 141 represents a hydrogen atom or a substituent selected from an alkyl group, an aryl group, a substituted or unsubstituted amino group, and a halogen atom.
- R 131 and R 132 each independently represents a hydrocarbon group having 1 to 12 carbon atoms.
- R 131 and R 132 are preferably hydrocarbon groups having 2 or more carbon atoms.
- R 131 and R 132 may be connected to each other to form a ring, and when forming a ring, it is particularly preferable to form a 5-membered ring or a 6-membered ring.
- Ar 131 and Ar 132 may be the same or different and each represents an aryl group which may have a substituent.
- Preferred aryl groups include a benzene ring group and a naphthalene ring group.
- a C12 or less hydrocarbon group, a halogen atom, and a C12 or less alkoxy group are mentioned.
- Y 131 and Y 132 may be the same or different and each represents a sulfur atom or a dialkylmethylene group having 12 or less carbon atoms.
- R 133 and R 134 may be the same or different and each represents a hydrocarbon group having 20 or less carbon atoms which may have a substituent.
- Preferred substituents include alkoxy groups having 12 or less carbon atoms, carboxyl groups, and sulfo groups.
- R 135 , R 136 , R 137 and R 138 may be the same or different and each represents a hydrogen atom or a hydrocarbon group having 12 or less carbon atoms. In view of easy availability of the raw material, a hydrogen atom is preferred.
- Z a - represents a counter anion. However, when the cyanine dye represented by the general formula (a) has an anionic substituent in the structure and neutralization of charge is not necessary, Z a - is not necessary.
- Preferred Z a ⁇ is a halide ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, and a sulfonate ion, particularly preferably a perchlorate ion, in view of the storage stability of the image recording layer coating solution.
- Hexafluorophosphate ions and aryl sulfonate ions are examples of the storage stability of the image recording layer coating solution.
- cyanine dye represented by the general formula (a) include compounds described in paragraphs [0017] to [0019] of JP-A No. 2001-133969, paragraph No. [0016] of JP-A No. 2002-023360.
- the compounds described in paragraphs [0035] to [0043] of JP-A-2007-90850 are particularly preferable.
- the infrared absorbing dye may be used alone or in combination of two or more, and an infrared absorbing agent other than an infrared absorbing dye such as a pigment may be used in combination.
- an infrared absorbing agent other than an infrared absorbing dye such as a pigment
- the pigment the compounds described in JP-A-2008-195018, paragraphs [0072] to [0076] are preferable.
- the content of the infrared absorber is preferably 0.05 to 30 parts by mass, more preferably 0.1 to 20 parts by mass, and particularly preferably 0.2 to 10 parts by mass with respect to 100 parts by mass of the total solid content of the image recording layer. Part by mass.
- the image recording layer preferably further contains a radical polymerizable compound.
- the radically polymerizable compound is preferably an addition polymerizable compound having at least one ethylenically unsaturated double bond, and is selected from compounds having at least one terminal ethylenically unsaturated bond, preferably two or more. It is more preferable. 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.
- Esters of an acid and a polyhydric alcohol compound and amides of an unsaturated carboxylic acid and a polyamine compound are used.
- addition reaction products of unsaturated carboxylic acid esters or amides having a nucleophilic substituent such as hydroxyl group, amino group, mercapto group and the like with monofunctional or polyfunctional isocyanates or epoxy, and monofunctional or polyfunctional
- a dehydration condensation reaction product with a functional carboxylic acid is also preferably used.
- an unsaturated carboxylic acid ester or amide having an electrophilic substituent such as an isocyanate group or an epoxy group and an addition reaction product of a monofunctional or polyfunctional alcohol, amine or thiol, a halogen group A substitution reaction product of an unsaturated carboxylic acid ester or amide having a leaving substituent such as a tosyloxy group and a monofunctional or polyfunctional alcohol, amine or thiol is also suitable. It is also possible to use a compound group in which the unsaturated carboxylic acid is replaced with unsaturated phosphonic acid, styrene, vinyl ether or the like.
- JP-T-2006-508380 JP-A-2002-287344, JP-A-2008-256850, JP-A-2001-342222, JP-A-9-179296, JP-A-9-179297.
- JP-A-9-179298 JP-A-2004-294935, JP-A-2006-243493, JP-A-2002-275129, JP-A-2003-64130, JP-A-2003-280187, This is described in, for example, Japanese Laid-Open Patent Publication No. 10-333321.
- ester monomer of the polyhydric alcohol compound and the unsaturated carboxylic acid include acrylic acid esters such as ethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, and propylene glycol diacrylate. , Trimethylolpropane triacrylate, hexanediol diacrylate, tetraethylene glycol diacrylate, pentaerythritol tetraacrylate, sorbitol triacrylate, isocyanuric acid ethylene oxide (EO) modified triacrylate, polyester acrylate oligomer, and the like.
- acrylic acid esters such as ethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, and propylene glycol diacrylate.
- Trimethylolpropane triacrylate Trimethylolpropane triacrylate, hexanediol diacrylate, te
- Methacrylic acid esters include tetramethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, pentaerythritol trimethacrylate, bis [p- (3-methacryloxy-2-hydroxypropoxy) phenyl ] Dimethylmethane, bis- [p- (methacryloxyethoxy) phenyl] dimethylmethane, and the like.
- amide monomers of polyvalent amine compounds and unsaturated carboxylic acids include methylene bis-acrylamide, methylene bis-methacrylamide, 1,6-hexamethylene bis-acrylamide, 1,6-hexamethylene bis-methacrylic.
- examples include amide, diethylenetriamine trisacrylamide, xylylene bisacrylamide, and xylylene bismethacrylamide.
- urethane-based addition-polymerizable compounds produced by using an addition reaction of isocyanate and hydroxyl group are also suitable. Specific examples thereof include, for example, one molecule described in JP-B-48-41708.
- a vinyl urethane compound containing two or more polymerizable vinyl groups in one molecule obtained by adding a vinyl monomer containing a hydroxyl group represented by the following general formula (P) to a polyisocyanate compound having two or more isocyanate groups Etc.
- CH 2 C (R 104) COOCH 2 CH (R 105) OH (P) (However, R 104 and R 105 represent H or CH 3. )
- urethanes as described in JP-A-51-37193, JP-B-2-32293, JP-B-2-16765, JP-A-2003-344997, JP-A-2006-65210 are disclosed.
- Urethane compounds having the described hydrophilic group are also suitable.
- tris (acryloyloxyethyl) isocyanate is excellent in that it has a good balance of hydrophilicity involved in on-press developability and polymerization ability involved in printing durability.
- Isocyanuric acid ethylene oxide-modified acrylates such as nurate and bis (acryloyloxyethyl) hydroxyethyl isocyanurate are particularly preferred.
- the details of the method of use such as the structure of the radical polymerizable compound, whether it is used alone or in combination, and the amount added can be arbitrarily set in accordance with the performance design of the final lithographic printing plate precursor.
- the radical polymerizable compound is preferably used in the range of 5 to 75% by mass, more preferably 25 to 70% by mass, and particularly preferably 30 to 60% by mass with respect to the total solid content of the image recording layer. .
- the image recording layer preferably further contains a radical polymerization initiator (hereinafter also referred to as an initiator compound).
- a radical polymerization initiator hereinafter also referred to as an initiator compound.
- the initiator compound those known to those skilled in the art can be used without limitation, and specifically include, for example, trihalomethyl compounds, carbonyl compounds, organic peroxides, azo compounds, azide compounds, metallocene compounds, hexaarynes.
- examples include rubiimidazole compounds, organic boron compounds, disulfone compounds, oxime ester compounds, onium salts, and iron arene complexes.
- at least one selected from the group consisting of hexaarylbiimidazole compounds, onium salts, trihalomethyl compounds and metallocene compounds is preferable, and hexaarylbiimidazole compounds and onium salts are particularly preferable.
- Two or more polymerization initiators may be used in combination as appropriate.
- hexaarylbiimidazole compound examples include lophine dimers described in European Patent No. 24629, European Patent No. 107792, US Pat. No. 4,410,621, such as 2,2′-bis (o-chlorophenyl) -4,4.
- onium salt examples include S.I. I. Schlesinger, Photogr. Sci. Eng. , 18, 387 (1974), T.A. S. Bal et al, Polymer, 21, 423 (1980), diazonium salts described in JP-A-5-158230, ammonium described in US Pat. No. 4,069,055, JP-A-4-365049, and the like. Salt, phosphonium salts described in U.S. Pat. Nos. 4,069,055 and 4,069,056, EP 104,143, U.S. Patent Application Publication No. 2008/0311520 JP-A-2-150848, JP-A-2008-195018, or J.P. V.
- iodonium salts sulfonium salts and azinium salts are more preferable.
- specific example of these compounds is shown below, it is not limited to this.
- a diphenyl iodonium salt is preferable, and a diphenyl iodonium salt substituted with an electron donating group such as an alkyl group or an alkoxyl group is particularly preferable, and an asymmetric diphenyl iodonium salt is more preferable.
- diphenyliodonium hexafluorophosphate
- 4-methoxyphenyl-4- (2-methylpropyl) phenyliodonium hexafluorophosphate
- 4- (2-methylpropyl) phenyl-p-tolyliodonium hexa Fluorophosphate
- 4-hexyloxyphenyl-2,4,6-trimethoxyphenyliodonium hexafluorophosphate
- 4-hexyloxyphenyl-2,4-diethoxyphenyliodonium tetrafluoroborate
- 4-octyloxy Phenyl-2,4,6-trimethoxyphenyliodonium 1-perfluorobutanesulfonate
- 4-octyloxyphenyl-2,4,6-trimethoxyphenyliodonium hexafluorophosphate, bis ( -t- butylphenyl) iodonium
- polymerization initiators described in JP-A 2007-206217, paragraphs [0071] to [0129] can also be preferably used.
- the radical polymerization initiators are preferably used alone or in combination of two or more.
- the content of the radical polymerization initiator in the image recording layer is preferably 0.01 to 20% by mass, more preferably 0.1 to 15% by mass, and still more preferably based on the total solid content of the image recording layer. 1.0 to 10% by mass.
- the image recording layer preferably contains a binder.
- the binder is preferably one that can carry the above-mentioned image recording layer component on a support and can be removed with a developer or at least one of printing ink and fountain solution.
- the binder include (meth) acrylic polymers, polyurethane resins, polyvinyl alcohol resins, polyvinyl butyral resins, polyvinyl formal resins, polyamide resins, polyester resins, and epoxy resins.
- (meth) acrylic polymers, polyurethane resins, and polyvinyl butyral resins are preferably used, and (meth) acrylic polymers, polyurethane resins, and polyvinyl butyral resins are more preferable.
- (meth) acrylic polymer means (meth) acrylic acid, (meth) acrylic acid ester (alkyl ester, aryl ester, allyl ester, etc.), (meth) acrylamide and (meth) acrylamide derivatives. It refers to a copolymer having a (meth) acrylic acid derivative such as “Polyurethane resin” refers to a polymer produced by a condensation reaction of a compound having two or more isocyanate groups and a compound having two or more hydroxyl groups.
- Polyvinyl butyral resin refers to a polymer synthesized by reacting polyvinyl alcohol and butyraldehyde obtained by saponifying a part or all of polyvinyl acetate under an acidic condition (acetalization reaction).
- a polymer having an acid group or the like introduced by a method of reacting a compound having a remaining hydroxy group and an acid group or the like is also included.
- a suitable example of the (meth) acrylic polymer includes a copolymer having a repeating unit containing an acid group.
- the acid group examples include a carboxylic acid group, a sulfonic acid group, a phosphonic acid group, a phosphoric acid group, and a sulfonamide group, and a carboxylic acid group is particularly preferable.
- a repeating unit containing an acid group a repeating unit derived from (meth) acrylic acid or one represented by the following general formula (I) is preferably used.
- R 211 represents a hydrogen atom or a methyl group
- R 212 represents a single bond or an n 211 +1 valent linking group
- a 211 represents an oxygen atom or —NR 213 —
- R 213 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms.
- n211 represents an integer of 1 to 5.
- the linking group represented by R 212 in the general formula (I) is composed of a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a sulfur atom and a halogen atom, and the number of atoms is preferably 1 to 80 It is.
- an alkylene group, a substituted alkylene group, an arylene group, a substituted arylene group, and the like can be mentioned.
- These divalent groups are linked in multiples by any of an amide bond, an ether bond, a urethane bond, a urea bond, and an ester bond. You may have the structure made.
- R 212 has a structure in which a single bond, an alkylene group, a substituted alkylene group, and an alkylene group and / or a substituted alkylene group are connected by a plurality of amide bonds, ether bonds, urethane bonds, urea bonds, or ester bonds.
- a single bond, an alkylene group having 1 to 5 carbon atoms, a substituted alkylene group having 1 to 5 carbon atoms and an alkylene group having 1 to 5 carbon atoms and / or a substituted alkylene group having 1 to 5 carbon atoms is an amide bond or an ether.
- a structure in which a plurality of bonds, urethane bonds, urea bonds, and ester bonds are connected is more preferable.
- An alkylene group of 1 to 3 and / or a substituted alkylene group of 1 to 3 carbon atoms is an amide bond, an ether bond, a urethane bond, a urea bond,
- a structure in which a plurality of ester bonds are linked by at least one of ester bonds is particularly preferable.
- Examples of the substituent that the linking group represented by R 212 may have include a monovalent nonmetallic atomic group excluding a hydrogen atom, and a halogen atom (—F, —Br, —Cl, -I), hydroxyl group, cyano group, alkoxy group, aryloxy group, mercapto group, alkylthio group, arylthio group, alkylcarbonyl group, arylcarbonyl group, carboxyl group and its conjugate base group, alkoxycarbonyl group, aryloxycarbonyl group, A carbamoyl group, an aryl group, an alkenyl group, an alkynyl group and the like can be mentioned.
- R 213 is preferably a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, more preferably a hydrogen atom or a hydrocarbon group having 1 to 3 carbon atoms, and particularly preferably a hydrogen atom or a methyl group.
- n211 is preferably 1 to 3, more preferably 1 or 2, and particularly preferably 1.
- the proportion (mol%) of the polymerization component having a carboxylic acid group in the total polymerization component of the (meth) acrylic polymer is preferably 1 to 70% from the viewpoint of developability. Considering compatibility between developability and printing durability, it is more preferably 1 to 50%, and particularly preferably 1 to 30%.
- the (meth) acrylic polymer used in the present invention preferably further has a crosslinkable group.
- the crosslinkable group is a group that crosslinks the binder in the course of radical polymerization reaction that occurs in the image recording layer when the lithographic printing plate precursor is exposed.
- it will not specifically limit if it is a group of such a function For example, an ethylenically unsaturated bond group, an amino group, an epoxy group etc.
- a functional group which can be addition-polymerized is mentioned as a functional group which can be addition-polymerized.
- the functional group which can become a radical by light irradiation may be sufficient, and as such a crosslinkable group, a thiol group, a halogen group, etc. are mentioned, for example.
- an ethylenically unsaturated bond group is preferable.
- a styryl group, a (meth) acryloyl group, and an allyl group are preferable.
- free radicals polymerization initiation radicals or growth radicals in the polymerization process of the polymerizable compound
- the addition polymerization is performed directly between the polymers or via the polymerization chain of the polymerizable compound.
- a cross-link is formed between the polymer molecules and cured.
- atoms in the polymer eg, hydrogen atoms on carbon atoms adjacent to the functional bridging group
- free radicals are abstracted by free radicals to form polymer radicals that are bonded together, thereby causing cross-linking between polymer molecules. Forms and cures.
- the content of the crosslinkable group in the (meth) acrylic polymer is preferably 0.01 to 10.0 mmol per 1 g of the binder.
- the amount is preferably 0.05 to 9.0 mmol, particularly preferably 0.1 to 8.0 mmol.
- the (meth) acrylic polymer used in the present invention includes, in addition to the above-described polymer unit having an acid group and polymer unit having a crosslinkable group, a polymer unit of (meth) acrylic acid alkyl or aralkyl ester, (meth) acrylamide. Alternatively, it may have a polymer unit of a derivative thereof, a polymer unit of ⁇ -hydroxymethyl acrylate, or a polymer unit of a styrene derivative.
- the alkyl group of the (meth) acrylic acid alkyl ester is preferably an alkyl group having 1 to 5 carbon atoms and an alkyl group having the aforementioned substituent having 2 to 8 carbon atoms, and a methyl group is more preferable.
- Examples of the (meth) acrylic acid aralkyl ester include benzyl (meth) acrylate.
- (meth) acrylamide derivatives include N-isopropylacrylamide, N-phenylmethacrylamide, N- (4-methoxycarbonylphenyl) methacrylamide, N, N-dimethylacrylamide, morpholinoacrylamide and the like.
- Examples of ⁇ -hydroxymethyl acrylate include ethyl ⁇ -hydroxymethyl acrylate and cyclohexyl ⁇ -hydroxymethyl acrylate.
- Examples of the styrene derivative include styrene and 4-tertbutylstyrene.
- the binder preferably has a hydrophilic group.
- the hydrophilic group contributes to imparting on-press developability to the image recording layer.
- the coexistence of the crosslinkable group and the hydrophilic group makes it possible to achieve both printing durability and on-press developability.
- hydrophilic group examples include, for example, a hydroxy group, a carboxyl group, an alkylene oxide structure, an amino group, an ammonium group, an amide group, a sulfo group, and a phosphate group.
- An alkylene oxide structure having 1 to 9 alkylene oxide units having 2 or 3 carbon atoms is preferred.
- copolymerization of a monomer having a hydrophilic group is performed.
- Preferable examples of the polyurethane resin include paragraph numbers [0099] to [0210] of JP-A No. 2007-187836, paragraph numbers [0019] to [0100] of JP-A No. 2008-276155, and JP-A No. 2005-250438. And the polyurethane resins described in JP-A-2005-250158, paragraph numbers [0021] to [0083].
- polyvinyl butyral resin examples include polyvinyl butyral resins described in paragraph numbers [0006] to [0013] of JP-A-2001-75279.
- Some of the acid groups in the binder may be neutralized with a basic compound.
- basic compounds include compounds containing basic nitrogen, alkali metal hydroxides, and quaternary ammonium salts of alkali metals.
- the binder preferably has a mass average molecular weight of 5,000 or more, more preferably 10,000 to 300,000, a number average molecular weight of 1,000 or more, and more preferably 2,000 to 250,000.
- the polydispersity (mass average molecular weight / number average molecular weight) is preferably 1.1 to 10.
- the above binders may be used alone or in combination of two or more.
- the content of the binder is preferably 5 to 75% by mass, more preferably 10 to 70% by mass, based on the total solid content of the image recording layer, from the viewpoint of good image area strength and image formability. More preferably, it is 10 to 60% by mass.
- the total content of the radical polymerizable compound and the binder is preferably 90% by mass or less based on the total solid content of the image recording layer. If it exceeds 90% by mass, the sensitivity and developability may be lowered. More preferably, it is 35 to 80% by mass.
- the image recording layer may contain a low molecular weight hydrophilic compound in order to improve the on-press developability without reducing the printing durability.
- a low molecular weight hydrophilic compound include water-soluble organic compounds such as glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, and ether or ester derivatives thereof, glycerin.
- Polyols such as pentaerythritol and tris (2-hydroxyethyl) isocyanurate, organic amines such as triethanolamine, diethanolamine and monoethanolamine and salts thereof, and organic such as alkylsulfonic acid, toluenesulfonic acid and benzenesulfonic acid Sulfonic acids and salts thereof, organic sulfamic acids such as alkylsulfamic acid and salts thereof, organic sulfuric acids such as alkylsulfuric acid and alkylethersulfuric acid and salts thereof, phenylphospho Organic phosphonic acids and salts thereof such as an acid, tartaric acid, oxalic acid, citric acid, malic acid, lactic acid, gluconic acid, organic carboxylic acids and salts thereof such as amino acids, betaines, and the like.
- organic amines such as triethanolamine, diethanolamine and monoethanolamine and salts thereof
- organic such as alkylsul
- At least one selected from polyols, organic sulfates, organic sulfonates, and betaines it is preferable to contain at least one selected from polyols, organic sulfates, organic sulfonates, and betaines.
- organic sulfonate examples include alkyl sulfonic acids such as sodium n-butyl sulfonate, sodium n-hexyl sulfonate, sodium 2-ethylhexyl sulfonate, sodium cyclohexyl sulfonate, and sodium n-octyl sulfonate.
- alkyl sulfonic acids such as sodium n-butyl sulfonate, sodium n-hexyl sulfonate, sodium 2-ethylhexyl sulfonate, sodium cyclohexyl sulfonate, and sodium n-octyl sulfonate.
- organic sulfate examples include sulfate of alkyl, alkenyl, alkynyl, aryl or heterocyclic monoether of polyethylene oxide.
- the ethylene oxide unit is preferably 1 to 4, and the salt is preferably a sodium salt, potassium salt or lithium salt. Specific examples thereof include compounds described in paragraph numbers [0034] to [0038] of JP-A-2007-276454.
- the betaines are preferably compounds having 1 to 5 carbon atoms in the hydrocarbon substituent on the nitrogen atom. Specific examples include trimethylammonium acetate, dimethylpropylammonium acetate, 3-hydroxy-4- Trimethylammoniobutylate, 4- (1-pyridinio) butyrate, 1-hydroxyethyl-1-imidazolioacetate, trimethylammonium methanesulfonate, dimethylpropylammonium methanesulfonate, 3-trimethylammonio-1-propanesulfonate , 3- (1-pyridinio) -1-propanesulfonate and the like.
- the dampening water penetrates into the exposed portion of the image recording layer (image portion) to improve the hydrophobicity and film strength of the image portion.
- the ink receptivity and printing durability of the image recording layer can be maintained well without being reduced.
- the content of the low molecular weight hydrophilic compound in the image recording layer is preferably 0.5 to 20% by mass, more preferably 1 to 15% by mass with respect to the total solid content of the image recording layer. More preferred is mass%. In this range, good on-press developability and printing durability can be obtained.
- a low molecular weight hydrophilic compound may be used independently and may be used in mixture of 2 or more types.
- the image-recording layer may contain a oil-sensitizing agent such as a phosphonium compound, a nitrogen-containing low molecular weight compound, or an ammonium group-containing polymer in order to improve the inking property.
- a oil-sensitizing agent such as a phosphonium compound, a nitrogen-containing low molecular weight compound, or an ammonium group-containing polymer in order to improve the inking property.
- the sensitizer functions as a surface coating agent for the inorganic stratiform compound, and prevents a decrease in the inking property during printing by the inorganic stratiform compound.
- nitrogen-containing low molecular weight compound examples include amine salts and quaternary ammonium salts. Also included are imidazolinium salts, benzoimidazolinium salts, pyridinium salts, and quinolinium salts. Of these, quaternary ammonium salts and pyridinium salts are preferred.
- tetramethylammonium hexafluorophosphate
- tetrabutylammonium hexafluorophosphate
- dodecyltrimethylammonium p-toluenesulfonate
- benzyltriethylammonium hexafluorophosphate
- benzyldimethyloctylammonium hexafluorophosphate.
- the ammonium group-containing polymer may be any polymer as long as it has an ammonium group in its structure, but a polymer containing 5 to 80 mol% of (meth) acrylate having an ammonium group in the side chain as a copolymerization component is preferable. . Specific examples include the polymers described in JP-A 2009-208458, paragraphs [0089] to [0105].
- the ammonium salt-containing polymer preferably has a reduced specific viscosity (unit: ml / g) determined by the following measurement method in the range of 5 to 120, more preferably in the range of 10 to 110, 15 Those in the range of ⁇ 100 are particularly preferred.
- the reduced specific viscosity is converted into a mass average molecular weight, it is preferably 10,000 to 150,000, more preferably 17,000 to 140000, and particularly preferably 20,000 to 130,000.
- the content of the sensitizer is preferably 0.01 to 30.0% by mass, more preferably 0.1 to 15.0% by mass, and more preferably 1 to 5% by mass with respect to the total solid content of the image recording layer. Is more preferable.
- the image recording layer may contain a hydrophobized precursor.
- the hydrophobized precursor means fine particles capable of converting the image recording layer to hydrophobic when heat is applied.
- the fine particles are at least one selected from hydrophobic thermoplastic polymer fine particles, heat-reactive polymer fine particles, polymer fine particles having a polymerizable group, microcapsules enclosing a hydrophobic compound, and microgel (crosslinked polymer fine particles). It is preferable. Among these, polymer fine particles and microgels having a polymerizable group are preferable.
- hydrophobic thermoplastic polymer fine particles Research Disclosure, No. 1992, January 1992 may be used. 333003, hydrophobic thermoplastic polymers described in JP-A-9-123387, JP-A-9-131850, JP-A-9-171249, JP-A-9-171250, European Patent 931647, and the like A fine particle can be mentioned as a suitable thing.
- Specific examples of polymers constituting such polymer fine particles include ethylene, styrene, vinyl chloride, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, vinylidene chloride, acrylonitrile, vinyl carbazole, and polyalkylene structures.
- more preferable examples include a copolymer containing polystyrene, styrene and acrylonitrile, and polymethyl methacrylate.
- the average particle diameter of the hydrophobic thermoplastic polymer fine particles used in the present invention is preferably 0.01 to 2.0 ⁇ m.
- heat-reactive polymer fine particles used in the present invention include polymer fine particles having a heat-reactive group, and these form a hydrophobized region by crosslinking due to a heat reaction and a functional group change at that time.
- thermoreactive group in the polymer fine particles having a thermoreactive group used in the present invention may be any functional group that performs any reaction as long as a chemical bond is formed, but is preferably a polymerizable group, Examples include ethylenically unsaturated groups that undergo radical polymerization reactions (eg, acryloyl groups, methacryloyl groups, vinyl groups, allyl groups, etc.), cationic polymerizable groups (eg, vinyl groups, vinyloxy groups, epoxy groups, oxetanyl groups, etc.) ), An isocyanato group that performs an addition reaction or a block thereof, an epoxy group, a vinyloxy group, and a functional group having an active hydrogen atom that is a reaction partner thereof (for example, an amino group, a hydroxy group, a carboxy group, etc.), and a condensation reaction Carboxy group and reaction partner hydroxy group or amino group, acid anhydride and reaction for ring-opening addition reaction An amino group or a hydroxyl group,
- the microcapsules used in the present invention for example, as described in JP-A Nos. 2001-277740 and 2001-277742, all or part of the constituent components of the image recording layer are encapsulated in the microcapsules. Is.
- the constituent components of the image recording layer can also be contained outside the microcapsules.
- the image recording layer containing the microcapsule includes a hydrophobic constituent component in the microcapsule and a hydrophilic constituent component outside the microcapsule.
- the microgel used in the present invention may contain a part of the constituent components of the image recording layer in at least one of the inside and the surface thereof.
- a reactive microgel is formed by having a radical polymerizable group on the surface thereof is particularly preferable from the viewpoint of image forming sensitivity and printing durability.
- a well-known method can be applied to microencapsulate or microgel the constituent components of the image recording layer.
- the average particle size of the microcapsules or microgel is preferably 0.01 to 3.0 ⁇ m, more preferably 0.05 to 2.0 ⁇ m, and particularly preferably 0.10 to 1.0 ⁇ m. Within this range, good resolution and stability over time can be obtained.
- the content of the hydrophobizing precursor is preferably 5 to 90% by mass based on the total solid content of the image recording layer.
- the image recording layer can contain a reducing agent from the viewpoint of improving printing durability.
- Preferred examples of the reducing agent include the following five types.
- (I) Alkyl or aryl art complex It is considered that a carbon-hetero bond is oxidatively cleaved to generate an active radical.
- a borate salt compound is preferably used.
- the borate salt compounds include JP-A-62-143044, JP-A-62-1050242, JP-A-9-188585, JP-A-9-188686, JP-A-9-188710, JP-A-2000-131837. , JP 2002-107916, JP 2766769 A, JP 2002-116539 A, etc., and Kunz, Martin “Rad Tech '98. Proceeding April 19-22, 1998, Chicago” etc. Borate is preferred.
- N-arylalkylamine compound It is considered that the C—X bond on the carbon adjacent to nitrogen is cleaved by oxidation to generate an active radical.
- X is preferably a hydrogen atom, a carboxyl group, a trimethylsilyl group or a benzyl group.
- N-phenylglycines described in the following chemical formula the phenyl group may or may not have a substituent
- N-phenyliminodiacetic acid the phenyl group has a substituent). Or not).
- Sulfur-containing compounds Compounds in which the nitrogen atom of the above-described amines is replaced with a sulfur atom can generate active radicals by the same action. Examples thereof include phenylthioacetic acid (the phenyl group may or may not have a substituent).
- Tin-containing compound A compound in which the nitrogen atom of the above-described amines is replaced with a tin atom can generate an active radical by the same action.
- Sulfinic acid salts An active radical can be generated by oxidation. Specific examples include arylsulfin sodium.
- a reducing agent may be used individually by 1 type, and may use 2 or more types together.
- the content of the reducing agent is preferably 0.01 to 30% by mass, more preferably 0.05 to 25% by mass, and still more preferably 0.1 to 20% by mass with respect to the total solid content of the image recording layer.
- Me represents a methyl group
- Et represents an ethyl group
- n-Bu represents an n-butyl group.
- the image recording layer preferably contains a chain transfer agent.
- the chain transfer agent is defined, for example, in Polymer Dictionary 3rd Edition (edited by the Polymer Society, 2005) pages 683-684.
- As the chain transfer agent for example, a compound group having SH, PH, SiH, GeH in the molecule is used. These can donate hydrogen to low-activity radical species to generate radicals, or can be oxidized and then deprotonated to generate radicals.
- thiol compounds for example, 2-mercaptobenzimidazoles, 2-mercaptobenzthiazoles, 2-mercaptobenzoxazoles, 3-mercaptotriazoles, 5-mercaptotetrazoles, etc. are particularly preferable. Can be used.
- the content of the chain transfer agent is preferably 0.01 to 20 parts by weight, more preferably 1 to 10 parts by weight, and particularly preferably 1 to 5 parts by weight with respect to 100 parts by weight of the total solid content of the image recording layer. It is.
- the image recording layer may further contain various additives as necessary.
- Additives include surfactants for promoting developability and improving the surface of the coating, hydrophilic polymers for improving developability and dispersion stability of microcapsules, and visual and non-image areas visible Coloring agents and print-out agents for polymerization, polymerization inhibitors for preventing unnecessary thermal polymerization of polymerizable compounds during the production or storage of the image recording layer, and higher fat derivatives for preventing polymerization inhibition by oxygen Hydrophobic low molecular weight compounds such as inorganic fine particles for improving the strength of the cured film in the image area, organic fine particles, co-sensitizers for improving sensitivity, and plasticizers for improving plasticity.
- the image recording layer in the lithographic printing plate precursor according to the invention is not particularly limited in the formation method, and can be formed by a known method.
- the image recording layer is formed by preparing or applying a coating solution by dispersing or dissolving each necessary component of the image recording layer in a solvent.
- the solvent used include methyl ethyl ketone, ethylene glycol monomethyl ether, 1-methoxy-2-propanol, 2-methoxyethyl acetate, 1-methoxy-2-propyl acetate, and ⁇ -butyllactone. It is not limited.
- a solvent is used individually or in mixture.
- the solid content concentration of the coating solution is preferably 1 to 50% by mass.
- the coating amount (solid content) of the image recording layer is preferably 0.3 to 3.0 g / m 2 .
- Various methods can be used as a coating method. Examples thereof include bar coater coating, spin coating, spray coating, curtain coating, dip coating, air knife coating, blade coating, and roll coating.
- the above-mentioned (A) organic-inorganic hybrid particles for example, (A) an aqueous dispersion of organic-inorganic hybrid particles are prepared, and then other components are prepared. It can carry out by mixing with a containing solution.
- the support used for the lithographic printing plate precursor according to the invention is not particularly limited as long as it is a dimensionally stable plate-like hydrophilic support.
- an aluminum plate is particularly preferable.
- surface treatment such as roughening treatment or anodizing treatment.
- the surface roughening treatment of the aluminum plate is performed by various methods. For example, mechanical surface roughening treatment, electrochemical surface roughening treatment (surface roughening treatment for dissolving the surface electrochemically), chemical treatment, etc. Surface roughening treatment (roughening treatment that chemically dissolves the surface selectively).
- the methods described in paragraph numbers [0241] to [0245] of JP-A-2007-206217 can be preferably used.
- the support preferably has a center line average roughness of 0.10 to 1.2 ⁇ m. Within this range, good adhesion to the image recording layer, good printing durability and good stain resistance can be obtained.
- the color density of the support is preferably 0.15 to 0.65 in terms of reflection density value. Within this range, good image formability by preventing halation during image exposure and good plate inspection after development can be obtained.
- the thickness of the support is preferably 0.1 to 0.6 mm, more preferably 0.15 to 0.4 mm, and still more preferably 0.2 to 0.3 mm.
- ⁇ Hydrophilic treatment> In the lithographic printing plate precursor according to the invention, it is also preferable to perform a hydrophilic treatment on the surface of the support in order to improve the hydrophilicity of the non-image area and prevent printing stains.
- a hydrophilic treatment of the support surface include alkali metal silicate treatment in which the support is immersed in an aqueous solution such as sodium silicate or electrolytic treatment, a method of treatment with potassium zirconate fluoride, a method of treatment with polyvinylphosphonic acid, and the like.
- the method of immersing in the polyvinylphosphonic acid aqueous solution is used preferably.
- the compound used for the undercoat layer includes an addition-polymerizable ethylenic double bond reactive group described in JP-A-10-282679.
- Preferable examples include silane coupling agents possessed, and phosphorus compounds having an ethylenic double bond reactive group described in JP-A-2-304441.
- Particularly preferred compounds include compounds having a polymerizable group such as a methacryl group and an allyl group and a support-adsorptive group such as a sulfonic acid group, a phosphoric acid group and a phosphoric acid ester.
- a compound having a hydrophilicity-imparting group such as an ethylene oxide group in addition to the polymerizable group and the support-adsorbing group can also be exemplified as a suitable compound.
- the undercoat layer is a method of applying a solution obtained by dissolving the above compound in water or an organic solvent such as methanol, ethanol, methyl ethyl ketone, or a mixed solvent thereof, and drying, or water, methanol, ethanol, The above compound can be adsorbed by immersing the support in a solution obtained by dissolving the above compound in an organic solvent such as methyl ethyl ketone or a mixed solvent thereof, and then washed and dried with water or the like.
- a solution of the above compound having a concentration of 0.005 to 10% by mass can be applied by various methods.
- any method such as bar coater coating, spin coating, spray coating, or curtain coating may be used.
- the concentration of the solution is 0.01 to 20% by mass, preferably 0.05 to 5% by mass
- the immersion temperature is 20 to 90 ° C., preferably 25 to 50 ° C.
- the immersion time is Is 0.1 second to 20 minutes, preferably 2 seconds to 1 minute.
- the coating amount (solid content) of the undercoat layer is preferably 0.1 to 100 mg / m 2 , and more preferably 1 to 30 mg / m 2 .
- a protective layer is preferably provided on the image recording layer in order to block diffusion and penetration of oxygen which hinders the polymerization reaction during exposure.
- a water-soluble polymer or a water-insoluble polymer can be appropriately selected and used, and two or more kinds can be mixed and used as necessary.
- Specific examples include polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble cellulose derivatives, poly (meth) acrylonitrile, and the like.
- using polyvinyl alcohol as a main component gives particularly good results in terms of basic characteristics such as oxygen barrier properties and development removability.
- the polyvinyl alcohol used in the protective layer may be partially substituted with an ester, an ether or an acetal as long as it contains an unsubstituted vinyl alcohol unit necessary for having the necessary oxygen barrier properties and water solubility. Similarly, some of them may have other copolymer components.
- Polyvinyl alcohol is obtained by hydrolyzing polyvinyl acetate. Specific examples of polyvinyl alcohol include those having a hydrolysis degree of 69.0 to 100 mol% and a number of polymerization repeating units in the range of 300 to 2400. Specifically, Kuraray Co., Ltd.
- Polyvinyl alcohol can be used alone or in combination.
- the content of polyvinyl alcohol in the protective layer is preferably 20 to 95% by mass, more preferably 30 to 90% by mass.
- modified polyvinyl alcohol can also be preferably used.
- acid-modified polyvinyl alcohol having a carboxylic acid group or a sulfonic acid group is preferably used.
- Specific examples include polyvinyl alcohols described in JP-A-2005-250216 and JP-A-2006-259137.
- modified polyvinyl alcohol polyvinyl pyrrolidone or a modified product thereof is preferable from the viewpoint of oxygen-blocking property and development removability, and its content in the protective layer Is 3.5 to 80% by mass, preferably 10 to 60% by mass, and more preferably 15 to 30% by mass.
- flexibility can be imparted by adding glycerin, dipropylene glycol or the like in an amount corresponding to several mass% with respect to the polymer.
- anionic surfactants such as sodium alkyl sulfate and sodium alkyl sulfonate
- amphoteric surfactants such as alkylaminocarboxylate and alkylaminodicarboxylate
- nonionic surfactants such as polyoxyethylene alkylphenyl ether
- the protective layer preferably contains an inorganic layered compound for the purpose of improving oxygen barrier properties and image recording layer surface protection.
- inorganic layered compounds fluorine-based swellable synthetic mica, which is a synthetic inorganic layered compound, is particularly useful.
- inorganic layered compounds described in JP-A No. 2005-119273 are preferable.
- the coating amount of the protective layer is preferably 0.05 to 10 g / m 2, and more preferably 0.1 to 5 g / m 2 when the inorganic layered compound is contained, and no inorganic layered compound is contained. Is more preferably 0.5 to 5 g / m 2 .
- the lithographic printing plate precursor according to the invention can be provided with a backcoat layer on the back surface of the support, if necessary.
- a back coat layer for example, an organic polymer compound described in JP-A-5-45885, an organometallic compound or an inorganic metal compound described in JP-A-6-35174 is hydrolyzed and polymerized.
- Preferable examples include a coating layer made of a metal oxide obtained by condensation. Among them, it is inexpensive to use a silicon alkoxy compound such as Si (OCH 3 ) 4 , Si (OC 2 H 5 ) 4 , Si (OC 3 H 7 ) 4 , Si (OC 4 H 9 ) 4. It is preferable in terms of easy availability.
- Organic-inorganic hybrid particles The present invention is an organic-inorganic hybrid particle in which (a) inorganic particles having a hydroxyl group and (b) an organic component are linked via a (c) linking group having a urethane bond or a urea bond, b) The organic component is connected to at least two of the (a) inorganic particles, the (a) inorganic particles are connected to at least two of the (b) organic components, and the organic component and the inorganic particles have a network structure. It also relates to the organic-inorganic hybrid particles formed. The detailed description of the organic-inorganic hybrid particles is as described above.
- the organic component contains (d) a polyfunctional isocyanate and (e) an active hydrogen atom. It is preferable that it is a reaction product with the compound which has. Moreover, it is preferable that (b) organic component has a repeating unit represented by the said General formula (1).
- the organic-inorganic hybrid particles of the present invention preferably further have a radical polymerizable group. Furthermore, the particle diameter of the organic-inorganic hybrid particles of the present invention is preferably 0.01 to 20 ⁇ m.
- a lithographic printing plate can be produced by subjecting the lithographic printing plate precursor of the present invention to image exposure and development.
- the method for producing a lithographic printing plate according to the first preferred embodiment of the present invention comprises the steps of exposing a lithographic printing plate precursor according to the present invention, and then removing unexposed portions with a developer having a pH of 2 to 12. This is a manufacturing method.
- an unexposed portion is formed on a printing machine with at least one of printing ink and dampening water. This is a method for preparing a lithographic printing plate to be removed.
- the preferable aspect of each process is demonstrated in order about the preparation methods of the lithographic printing plate of this invention.
- the preparation method of the lithographic printing plate of the present invention includes an exposure step of exposing the lithographic printing plate precursor of the present invention.
- the lithographic printing plate precursor according to the invention is preferably imagewise exposed by laser exposure through a transparent original having a line image, a halftone dot image or the like, or by laser beam scanning with digital data.
- the wavelength of the light source is preferably 750 to 1400 nm.
- a solid laser or semiconductor laser that emits infrared light is suitable.
- the output is preferably 100 mW or more, the exposure time per pixel is preferably within 20 microseconds, and the irradiation energy amount is preferably 10 to 300 mJ / cm 2 .
- the exposure mechanism may be any of an internal drum system, an external drum system, a flat bed system, and the like. Image exposure can be performed by a conventional method using a plate setter or the like. In the case of on-press development, the lithographic printing plate precursor may be mounted on a printing press and then image exposure may be performed on the printing press.
- the development process is either (1) a method of removing unexposed portions with a developer having a pH of 2 to 14 (preferably 2 to 12) (developer treatment method), or (2) printing ink and dampening on a printing press. It can be performed by a method (on-press development method) of removing unexposed portions with at least one of water.
- the image-exposed lithographic printing plate precursor is processed with a developer having a pH of 2 to 14, and the unexposed portion is removed to prepare a lithographic printing plate.
- the development processing using a highly alkaline developer usually, the protective layer is removed by a pre-water washing step, then alkali development is performed, the alkali is washed away by water in the post-water washing step, gum solution treatment is performed, and drying is performed.
- a lithographic printing plate is produced by drying in the process.
- a developer having a pH of 2 to 12 is used.
- the unexposed portion of the image recording layer is removed by a developer having a pH of 2 to 12 after exposure.
- a surfactant or a water-soluble polymer compound is contained in the developer, whereby the development and the gum solution treatment can be performed simultaneously. Therefore, the post-water washing step is not particularly required, and the development-gum solution treatment can be performed with one solution. Further, the pre-water washing step is not particularly required, and the protective layer can be removed simultaneously with the development-gum solution treatment.
- the excess developer is removed using, for example, a squeeze roller, followed by drying.
- the developer treatment of the lithographic printing plate precursor according to the invention is carried out in accordance with a conventional method at a temperature of 0 to 60 ° C., preferably about 15 to 40 ° C., for example, by immersing the exposed lithographic printing plate precursor in a developer solution with a brush. It can be performed by a method of rubbing with a brush, a method of spraying a developer by spraying and rubbing with a brush.
- the development processing with the developer can be suitably carried out by an automatic developing processor equipped with a developer supply means and a rubbing member.
- An automatic developing processor using a rotating brush roll as the rubbing member is particularly preferable.
- the automatic processor preferably includes a means for removing excess developer such as a squeeze roller and a drying means such as a warm air device after the development processing means.
- the automatic development processor may be provided with a preheating means for heat-treating the lithographic printing plate precursor after image exposure before the development processing means.
- the developer used for the developer processing in the present invention contains an aqueous solution having a pH of 2 to 14, or a surfactant.
- the developer is preferably an aqueous solution containing water as a main component (containing 60% by mass or more of water), and in particular, an aqueous solution containing a surfactant (anionic, nonionic, cationic, amphoteric ion, etc.)
- An aqueous solution containing a water-soluble polymer compound is preferred.
- An aqueous solution containing both a surfactant and a water-soluble polymer compound is also preferred.
- the pH of the developer is more preferably 2 to 12, still more preferably 3.5 to 12, particularly preferably 6 to 12, and most preferably 6.5 to 10.5.
- the anionic surfactant used in the developer in the present invention is not particularly limited, but fatty acid salts, abietic acid salts, hydroxyalkanesulfonic acid salts, alkanesulfonic acid salts, dialkylsulfosuccinic acid salts, linear alkylbenzenesulfonic acid Salts, branched alkylbenzene sulfonates, alkyl naphthalene sulfonates, alkyl diphenyl ether (di) sulfonates, alkylphenoxy polyoxyethylene alkyl sulfonates, polyoxyethylene alkyl sulfophenyl ether salts, N-alkyl-N-oleyl Sodium taurine, N-alkylsulfosuccinic acid monoamide disodium salt, petroleum sulfonates, sulfated castor oil, sulfated beef tallow oil, sulfate esters of fatty acid alky
- the cationic surfactant used in the developer is not particularly limited, and conventionally known cationic surfactants can be used. Examples thereof include alkylamine salts, quaternary ammonium salts, alkyl imidazolinium salts, polyoxyethylene alkylamine salts, and polyethylene polyamine derivatives.
- the nonionic surfactant used in the developer in the present invention is not particularly limited, but is a polyethylene glycol type higher alcohol ethylene oxide adduct, alkylphenol ethylene oxide adduct, alkyl naphthol ethylene oxide adduct, phenol ethylene oxide addition.
- Naphthol ethylene oxide adduct Naphthol ethylene oxide adduct, fatty acid ethylene oxide adduct, polyhydric alcohol fatty acid ester ethylene oxide adduct, higher alkylamine ethylene oxide adduct, fatty acid amide ethylene oxide adduct, fat ethylene oxide adduct, polypropylene glycol ethylene oxide Adduct, dimethylsiloxane-ethylene oxide block copolymer, dimethylsiloxane- (propylene oxide- Tylene oxide) block copolymer, fatty acid ester of polyhydric alcohol type glycerol, fatty acid ester of pentaerythritol, fatty acid ester of sorbitol and sorbitan, fatty acid ester of sucrose, alkyl ether of polyhydric alcohol, fatty acid amide of alkanolamines, etc.
- the zwitterionic surfactant used in the developer in the present invention is not particularly limited, and examples thereof include amine oxides such as alkyldimethylamine oxide, betaines such as alkylbetaine, and amino acids such as sodium alkylamino fatty acid. It is done.
- alkyldimethylamine oxide which may have a substituent alkylcarboxybetaine which may have a substituent
- alkylsulfobetaine which may have a substituent are preferably used.
- a compound represented by the formula (2) in paragraph No. [0256] of JP-A-2008-203359, a formula (I), a formula (II) in paragraph No. [0028] of JP-A-2008-276166, A compound represented by the formula (VI) or a compound represented by paragraph numbers [0022] to [0029] of JP-A-2009-47927 can be used.
- the amount of the surfactant contained in the developer is preferably 0.01 to 20% by mass, and more preferably 0.1 to 10% by mass.
- water-soluble polymer compound used in the developer in the present invention examples include soybean polysaccharide, modified starch, gum arabic, dextrin, fibrin derivatives (for example, carboxymethylcellulose, carboxyethylcellulose, methylcellulose, etc.) and modified products thereof, pullulan, Polyvinyl alcohol and its derivatives, polyvinyl pyrrolidone, polyacrylamide and acrylamide copolymer, vinyl methyl ether / maleic anhydride copolymer, vinyl acetate / maleic anhydride copolymer, styrene / maleic anhydride copolymer, polyvinyl sulfonic acid And salts thereof, polystyrenesulfonic acid and salts thereof, and the like.
- soybean polysaccharides known ones can be used.
- Soya Five manufactured by Fuji Oil Co., Ltd.
- What can be preferably used is one in which the viscosity of a 10% by mass aqueous solution is in the range of 10 to 100 mPa / sec.
- modified starch known ones can be used.
- starch such as corn, potato, tapioca, rice and wheat is decomposed with acid or enzyme in the range of 5 to 30 glucose residues per molecule, and further alkali It can be made by a method of adding oxypropylene in the inside.
- the water-soluble polymer compound can be used in combination of two or more in the developer.
- the content of the water-soluble polymer compound in the developer is preferably from 0.1 to 20% by mass, more preferably from 0.5 to 10% by mass.
- the developer used in the present invention can contain a pH buffer.
- the developing solution of the present invention can be used without particular limitation as long as it is a buffering agent that exhibits a buffering action at a pH of 2 to 14.
- weakly alkaline buffering agents are preferably used.
- (a) carbonate ions and hydrogen carbonate ions, (b) borate ions, (c) water-soluble amine compounds and ions of the amine compounds, and their Combination use etc. are mentioned. That is, for example, a combination of (a) carbonate ion-bicarbonate ion, (b) borate ion, or (c) water-soluble amine compound-ion of the amine compound exhibits pH buffering action in the developer.
- carbonate and bicarbonate may be added to the developer, or by adjusting the pH after adding carbonate or bicarbonate, Ions and bicarbonate ions may be generated.
- the carbonate and bicarbonate are not particularly limited, but are preferably alkali metal salts. Examples of the alkali metal include lithium, sodium, and potassium, and sodium is particularly preferable. Alkali metals may be used alone or in combination of two or more.
- the total amount of carbonate ions and hydrogen carbonate ions is preferably 0.05 to 5 mol / L, more preferably 0.07 to 2 mol / L, and particularly preferably 0.1 to 1 mol / L with respect to the developer.
- the developer may contain an organic solvent.
- organic solvent examples include aliphatic hydrocarbons (hexane, heptane, Isopar E, H, G (manufactured by Esso Chemical Co., Ltd.)), aromatic hydrocarbons (toluene, xylene, etc.), halogens, and the like. Hydrocarbons (methylene dichloride, ethylene dichloride, trichlene, monochlorobenzene, etc.) and polar solvents.
- Polar solvents include alcohols (methanol, ethanol, propanol, isopropanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, 1 -Nonanol, 1-decanol, benzyl alcohol, ethylene glycol monomethyl ether, 2-ethoxyethanol, diethylene glycol monoethyl ether, diethylene glycol monohexyl ether, triethylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monomethyl ether, polyethylene glycol monomethyl Ether, polypropylene glycol, tetraethylene glycol, ethylene glycol monobutyl ether Ter, ethylene glycol monobenzyl ether, ethylene glycol monophenyl ether, propylene glycol monophenyl ether, methylphenyl carbinol,
- the organic solvent contained in the developer can be used in combination of two or more.
- the organic solvent When the organic solvent is insoluble in water, it can be used after being solubilized in water using a surfactant or the like.
- the concentration of the organic solvent is preferably less than 40% by mass from the viewpoint of safety and flammability.
- the developer may contain a preservative, a chelate compound, an antifoaming agent, an organic acid, an inorganic acid, an inorganic salt, and the like.
- a preservative e.g., a chelate compound, an antifoaming agent, an organic acid, an inorganic acid, an inorganic salt, and the like.
- compounds described in paragraph numbers [0266] to [0270] of JP-A-2007-206217 can be preferably used.
- the developer can be used as a developer and a development replenisher for the exposed lithographic printing plate precursor. Further, the present invention can be preferably applied to the automatic developing processor as described above. When developing using an automatic developing processor, the developing solution becomes fatigued according to the amount of processing, so that the processing capability may be restored by using a replenishing solution or a fresh developing solution.
- the image-exposed lithographic printing plate precursor is supplied with at least one of printing ink and fountain solution on the printing machine, and an unexposed portion is removed to produce a lithographic printing plate. That is, in this embodiment, the image recording layer is such that the unexposed portion is removed by at least one of printing ink and fountain solution on the printing press after exposure.
- the lithographic printing plate precursor after exposing the lithographic printing plate precursor, it is directly mounted on the printing machine without any development processing, or after the lithographic printing plate precursor is mounted on the printing machine, it is exposed on the printing machine,
- an uncured image recording layer is formed in an unexposed portion by at least one of the supplied printing ink and fountain solution at an early stage of printing. It is removed by dissolution or dispersion, and a hydrophilic surface is exposed at that portion.
- the image recording layer cured by exposure forms an oil-based ink receiving portion having a lipophilic surface.
- Printing ink may be supplied to the printing plate first, or dampening water, but printing ink is supplied first in order to prevent the dampening water from being contaminated by the removed image recording layer components. It is preferable to do. In this way, the lithographic printing plate precursor is subjected to on-press development on a printing machine and used as it is for printing a large number of sheets.
- the entire lithographic printing plate precursor is exposed before exposure, during exposure, and from exposure to development, regardless of the development method. You may heat. By such heating, an image forming reaction in the image recording layer is promoted, and advantages such as improvement in sensitivity and printing durability and stabilization of sensitivity may occur.
- it is also effective to perform whole surface post-heating or whole surface exposure on the image after the development processing for the purpose of improving the image strength and printing durability.
- heating before development is preferably performed under a mild condition of 150 ° C. or less. If the temperature is too high, problems such as curing of the non-image area may occur.
- Very strong conditions are used for heating after development. Usually, it is in the range of 100 to 500 ° C. If the temperature is low, sufficient image reinforcing action cannot be obtained. If the temperature is too high, problems such as deterioration of the support and thermal decomposition of the image area may occur.
- the molecular weight is a mass average molar mass (Mw) in terms of polystyrene converted by the GPC method, and the ratio of repeating units is a mole percentage.
- the mixture After adding 100 mg of triamylamine, the mixture was refluxed for 12 hours. After cooling to room temperature, the silica particles were precipitated by centrifugation and the supernatant was removed. After adding 50 g of ethyl acetate and stirring, the operation of precipitating the silica particles by centrifugation was repeated twice to wash the silica particles. Similarly, after washing with 50 g of distilled water, 20 g of distilled water was added to obtain a 20 mass% aqueous solution of organic-inorganic hybrid particles S-9. The particle diameter of the organic-inorganic hybrid particle S-9 was measured by a light scattering method and found to be 0.33 ⁇ m.
- O * represents an oxygen atom derived from the hydroxyl group of the inorganic particles.
- Synthesis Examples 17 to 33 Synthesis of polyvalent isocyanate adducts NCO-2 to 18
- Synthesis Example 16 except that P-1 and isophorone diisocyanate were changed to Compound P and polyvalent isocyanate compound I having at least two active hydrogen atoms shown in Table 3 below, respectively, the same as Synthesis Example 16
- polyisocyanate adducts NCO-2 to NCO-18
- organic-inorganic hybrid particle S-16 The solid content concentration of the organic-inorganic hybrid particle liquid thus obtained was adjusted to 20% by mass with distilled water, and this was designated as organic-inorganic hybrid particle S-16. When an average particle diameter was measured by a light scattering method, it was 0.28 ⁇ m.
- Synthesis Examples 35 to 62 and Comparative Synthesis Examples 2 to 7 Synthesis of Organic-Inorganic Hybrid Particles S-17 to 44 and R-2 to 7)
- Synthesis Example 34 except that the types and addition amounts of Components 1 and 3 to 5 used were changed as shown in Table 4 below, in the same manner as in Synthesis Example 34, the organic-inorganic hybrid particles S-17 to 44 and R-2 to R-7 were obtained.
- Examples 1 to 78 and Comparative Examples 1 to 17 [Examples 1 to 78 and Comparative Examples 1 to 17] 1. On-press development type lithographic printing plate precursor production method A (for Examples 1 to 52 and Comparative Examples 1 to 9)
- Etching was performed by immersing the aluminum plate in a 25 mass% sodium hydroxide aqueous solution at 45 ° C for 9 seconds, washing with water, and further immersed in a 20 mass% nitric acid aqueous solution at 60 ° C for 20 seconds, followed by washing with water.
- the etching amount of the grained surface was about 3 g / m 2 .
- the electrolytic solution was a 1% by mass aqueous nitric acid solution (containing 0.5% by mass of aluminum ions), and the liquid temperature was 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 with a current density of 15 A / dm 2 is provided on an aluminum plate as an electrolyte using a 15 mass% sulfuric acid aqueous solution (containing 0.5 mass% of aluminum ions), and then washed with water.
- the support A was prepared by drying. Thereafter, in order to ensure the hydrophilicity of the non-image area, the support A was subjected to silicate treatment at 60 ° C. for 10 seconds using a 2.5 mass% No. 3 sodium silicate aqueous solution, and then washed with water to obtain the support B. Produced.
- the adhesion amount of Si was 10 mg / m 2 .
- the center line average roughness (Ra) of the support was measured using a needle having a diameter of 2 ⁇ m and found to be 0.51 ⁇ m.
- the following image recording layer coating solution (1) is bar-coated, oven dried at 100 ° C. for 60 seconds, and an image recording layer having a dry coating amount of 1.0 g / m 2. Formed.
- the image recording layer coating solution (1) was prepared by mixing and stirring the following photosensitive solution and particle dispersion immediately before coating.
- Binder polymer (1) used in the above photosensitive solution, sensitizer represented by formula (X-1), fluorine-based surfactant (1), low molecular weight hydrophilic compound (1), phosphonium compound (1) The structures of the ammonium group-containing polymer, the polymerization initiator (1), the polymerizable monomers (M-1) to (M-4) and TPB are as follows.
- a protective layer coating solution having the following composition was further bar coated and oven dried at 120 ° C. for 60 seconds to form a protective layer having a dry coating amount of 0.15 g / m 2.
- Lithographic printing plate precursors for 1 to 52 and Comparative Examples 1 to 9 were prepared.
- a method for preparing the inorganic layered compound dispersion (1) used in the protective layer coating solution is shown below.
- the aspect ratio of the obtained dispersed particles was 100 or more.
- Preparation method B of on-press development type lithographic printing plate precursor (for Examples 53 to 78 and Comparative Examples 10 to 17)
- An undercoat layer is formed on the support in the same manner as the above on-press development type lithographic printing plate precursor A, and an image recording layer coating solution (2) having the following composition is bar-coated on this undercoat layer at 70 ° C. for 60 seconds.
- An image recording layer coating solution (2) having the following composition is bar-coated on this undercoat layer at 70 ° C. for 60 seconds.
- lithographic printing plate precursors having no protective layer for Examples 53 to 78 and Comparative Examples 10 to 17 were prepared. .
- planographic printing plate precursor The on-press development type lithographic printing plate precursor thus obtained was evaluated for on-press developability, flaking property and printing durability as follows.
- the lithographic printing plate precursor was exposed with a Luxel PLANETSETTER T-6000III equipped with an infrared semiconductor laser under the conditions of an outer drum rotation speed of 1000 rpm, a laser output of 70%, and a resolution of 2400 dpi.
- the exposure image included a solid image and a 50% halftone dot chart of a 20 ⁇ m dot FM screen.
- the exposed lithographic printing plate precursor was mounted on the plate cylinder of a printing machine LITHRONE 26 manufactured by Komori Corporation without developing.
- On-press development was evaluated as the on-press developability of the number of print sheets required until the on-press development of the unexposed portion of the image recording layer was completed on the printing press and the ink was not transferred to the non-image portion. The smaller the number, the better the on-press developability.
- the planographic printing plate precursor of the example containing the organic-inorganic hybrid particles of the present invention in the image recording layer is Comparative Example 1 in which organic-inorganic hybrid particles having no urethane bond or urea bond are used.
- Comparative Examples 2 to 7, 9, 11 to 13, and 15 to 17 using organic particles that do not contain 8, 10, and 14, and inorganic particles the printing durability is not deteriorated without deteriorating the performance of development residue. It can be seen that the balance between the property and the developability can be achieved at a high level.
- a lithographic printing plate precursor capable of achieving both high printing durability and developability at a high level, a method for preparing a lithographic printing plate using the same, and organic-inorganic hybrid particles used therefor. .
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Abstract
Description
特に近年は、地球環境への配慮が産業界全体の大きな関心事となっている。環境への配慮からも、より中性域に近い現像液での処理や少ない廃液が課題として挙げられている。更に湿式の後処理は、簡素化するか、乾式処理に変更することが望ましい。
しかし、熱可塑性疎水性重合体微粒子を合体(融着)させて形成する画像は、強度が不充分で、印刷版としての耐刷性に問題がある。
また、重合性化合物は反応性が高いため、マイクロカプセルを用いて隔離しておく方法が多く提案されている。そして、マイクロカプセルのシェルには、熱分解性のポリマーを使用することが提案されている。
ここで、一般に、画像記録層の強度を向上させることにより、耐刷性の向上を図る方法によれば、現像性が低下する傾向となることから、耐刷性と現像性とを両立させることは難しい。特に、機上現像は、アルカリ現像液で現像するシステムよりも現像性が劣る傾向となるため、耐刷性と現像性とを高次元で共に満足させることは非常に難しい。
親水性支持体上に、(A)有機-無機ハイブリッド粒子、及び、(B)赤外線吸収剤を含有する画像記録層を有する平版印刷版原版であって、上記(A)有機-無機ハイブリッド粒子が、(a)水酸基を有する無機粒子と、(b)有機成分とが、(c)ウレタン結合或いはウレア結合を有する連結基を介して連結した、有機-無機ハイブリッド粒子である、平版印刷版原版。
〔2〕
上記(A)有機-無機ハイブリッド粒子は、上記(b)有機成分が、1つの上記(a)無機粒子とのみに連結した粒子である、〔1〕に記載の平版印刷版原版。
〔3〕
上記(A)有機-無機ハイブリッド粒子は、上記(b)有機成分が、少なくとも2つの上記(a)無機粒子と連結し、上記(a)無機粒子が、少なくとも2つの上記(b)有機成分と連結して、上記(b)有機成分及び無機粒子がネットワーク構造を形成した粒子である、〔1〕に記載の平版印刷版原版。
〔4〕
上記(b)有機成分が、(d)多官能イソシアネートと、(e)活性水素原子を有する化合物との反応生成物である、〔3〕に記載の平版印刷版原版。
〔5〕
上記(d)多官能イソシアネートが、多官能イソシアネートと、少なくとも2つの活性水素原子を有する化合物との付加物から形成される、〔4〕に記載の平版印刷版原版。
〔6〕
上記(b)有機成分が、下記一般式(1)で表される繰り返し単位を有する、〔1〕~〔5〕の何れか1項に記載の平版印刷版原版。
一般式(1)中、Xは、酸素原子、硫黄原子、-CO-、又は、-COO-を表す。R1は炭素数2~10のアルキレンを表す。n1は1~90である。
〔7〕
上記(A)有機-無機ハイブリッド粒子が、ラジカル重合性基を有する、〔1〕~〔6〕の何れか1項に記載の平版印刷版原版。
〔8〕
上記(a)無機粒子が、シリカ、アルミナ、チタニア、ジルコニア、酸化マグネシウム、酸化亜鉛、タルク、クレー、ウォラストナイト、ゾノライト、水酸化アルミニウム、及び、水酸化マグネシウムからなる群より選ばれる少なくとも1種以上の粒子である、〔1〕~〔7〕の何れか1項に記載の平版印刷版原版。
〔9〕
上記(a)無機粒子の粒径が0.005~5μmである、〔1〕~〔8〕の何れか1項に記載の平版印刷版原版。
〔10〕
上記(A)有機-無機ハイブリッド粒子の粒径が、0.01~20μmである、〔1〕~〔9〕の何れか1項に記載の平版印刷版原版。
〔11〕
上記画像記録層が、更に、(C)ラジカル重合性化合物、及び(D)ラジカル重合開始剤を含む、〔1〕~〔10〕の何れか1項に記載の平版印刷版原版。
〔12〕
上記画像記録層は、露光後にpH2~12の現像液により未露光部が除去される、〔1〕~〔11〕の何れか1項に記載の平版印刷版原版。
〔13〕
上記画像記録層は、露光後に印刷機上で印刷インキ及び湿し水の少なくとも一方により未露光部が除去される、〔1〕~〔11〕の何れか1項に記載の平版印刷版原版。
〔14〕
〔1〕~〔12〕の何れか1項に記載の平版印刷版原版を露光した後、pH2~12の現像液により未露光部を除去する、平版印刷版の作製方法。
〔15〕
〔1〕~〔11〕及び〔13〕の何れか1項に記載の平版印刷版原版を露光した後、印刷機上で印刷インキ及び湿し水の少なくとも一方により未露光部を除去する、平版印刷版の作製方法。
〔16〕
(a)水酸基を有する無機粒子と、(b)有機成分とが、(c)ウレタン結合或いはウレア結合を有する連結基を介して連結した、有機-無機ハイブリッド粒子であり、上記(b)有機成分が、少なくとも2つの上記(a)無機粒子と連結し、上記(a)無機粒子が、少なくとも2つの上記(b)有機成分と連結して、有機成分及び無機粒子がネットワーク構造を形成した、有機-無機ハイブリッド粒子。
〔17〕
上記(b)有機成分が、(d)多官能イソシアネートと、(e)活性水素原子を有する化合物との反応生成物である、〔16〕に記載の有機-無機ハイブリッド粒子。
〔18〕
上記有機成分が、下記一般式(1)で表される繰り返し単位を有する、〔16〕又は〔17〕に記載の有機-無機ハイブリッド粒子。
一般式(1)中、Xは、酸素原子、硫黄原子、-CO-、又は、-COO-を表す。R1は炭素数2~10のアルキレンを表す。n1は1~90である。
〔19〕
更に、ラジカル重合性基を有する、〔16〕~〔18〕の何れか1項に記載の有機-無機ハイブリッド粒子。
〔20〕
粒径が、0.01~20μmである、〔16〕~〔19〕の何れか1項に記載の有機-無機ハイブリッド粒子。
本明細書中、一般式で表される化合物における基の表記に関して、置換あるいは無置換を記していない場合、当該基が更に置換基を有することが可能な場合には、他に特に規定がない限り、無置換の基のみならず置換基を有する基も包含する。例えば、一般式において、「Rはアルキル基、アリール基又は複素環基を表す」との記載があれば、「Rは無置換アルキル基、置換アルキル基、無置換アリール基、置換アリール基、無置換複素環基又は置換複素環基を表す」ことを意味する。また、本明細書中、例えば、(メタ)アクリル酸エステルは、メタクリル酸エステルとアクリル酸エステルを共に含む概念を表す。
更に、「粒径」とは、特に断りがなければ、一次粒子の平均粒径を表すものであり、本発明において、粒子の粒径は、光散乱法により測定することができる。
本発明に係る平版印刷版原版は、親水性支持体上に、(A)有機-無機ハイブリッド粒子、及び、(B)赤外線吸収剤を含有する画像記録層を有する平版印刷版原版であって、(A)有機-無機ハイブリッド粒子が、(a)水酸基を有する無機粒子と、(b)有機成分とが、(c)ウレタン結合或いはウレア結合を有する連結基を介して連結した、有機-無機ハイブリッド粒子である。
本発明に係る平版印刷版原版は、必要に応じて、支持体と画像記録層の間に下塗り層を、また、画像記録層の上に保護層を設けることができる。
画像記録層に含有される有機-無機ハイブリッド粒子は、上記の通り、(a)水酸基を有する無機粒子と、(b)有機成分とが、(c)ウレタン結合或いはウレア結合を有する連結基を介して連結した、有機-無機ハイブリッド粒子である。
上記有機-無機ハイブリッド粒子において、ウレタン結合或いはウレア結合を有する連結基は、典型的には、無機粒子が有する水酸基における水素原子に置き換わる形で、無機粒子に連結する。
上記有機-無機ハイブリッド粒子を含有する画像記録層を有する平版印刷版原版によれば、耐刷性と現像性とを高次元で両立することができる。
このような優れた特性が得られる作用機構については、必ずしも明確ではないが、以下のように考えられる。
即ち、先ず、有機-無機ハイブリッド粒子中の無機粒子は硬度が高いため、画像部の耐刷性が向上するものと考えられる。更に、上記無機粒子が、高い強度を有するウレタン結合或いはウレア結合を有する連結基を介して有機成分に連結するため、これによっても、高い耐刷性が得られるものと考えられる。更に、無機粒子が、有機-無機ハイブリッド粒子内に固定されることにより、無機粒子同士の凝集が発生しにくく、画像部により均一に無機粒子が存在しやすいため、現像性の低下を引き起こしやすい無機粒子の多量添加を行わずとも、充分な耐刷性を発現することが可能になるものと考えられる。すなわち、耐刷性と現像性とを高次元で両立できるものと考えられる。
上記の非芳香族炭化水素(直鎖状、分岐状、又は環状)、芳香族炭化水素、芳香族複素環、及び、非芳香族複素環は、置換基を有していてもよい。ここで、「置換基を有する」とは、有機成分を構成する任意の原子(典型的には水素原子又は炭素原子)が、置換基に置換されることを意味する。置換基としては、ハロゲン原子、アルキル基(直鎖、分岐のいずれであっても良く、炭素数1~12が好ましい)、シクロアルキル基(単環、多環、スピロ環のいずれであっても良く、炭素数3~20が好ましい)、アリール基(炭素数6~14が好ましい)、ヒドロキシ基、シアノ基、アルコキシ基、エステル結合、アミド結合、ウレタン結合、ウレア結合、ウレイド基、エーテル結合、チオエーテル結合、スルホンアミド結合、スルホン酸エステル結合、及び、これらの結合及び基から選択される2種以上が組み合わされてなる基等が挙げられる。
有機-無機ハイブリッド粒子の作製方法としては、先ず、水酸基を有する無機粒子に対して、無機粒子が有する水酸基と反応可能な反応性基と、有機成分とが、ウレタン結合或いはウレア結合を有する連結基を介して結合された化合物を反応させる方法や、水酸基を有する無機粒子に対して、有機成分とイソシアネート基とを有する化合物を反応させる方法が挙げられる。
無機粒子が有する水酸基と反応可能な反応性基としては、アルキルオキシシリル基、クロロシリル基、ブロモシリル基、ヨードシリル基、酸基における水素原子を塩素原子に置換してなる基等を挙げることができる。
この形態における有機-無機ハイブリッド粒子は、例えば、下記反応スキーム(A-1)及び(A-2)に基づき作製できる。なお、下記反応スキーム中のnは、アルキレンオキシ構造の繰り返し数を表す。
この形態においては、先ず、水酸基を有する無機粒子に対して、無機粒子が有する水酸基と反応可能な反応性基と、アミノ基とを有する化合物を反応させ、この反応物に対して、更に、例えば、多官能イソシアネートを反応させることにより、水酸基を有する無機粒子と、有機成分とが、ウレタン結合或いはウレア結合を有する連結基を介して結合されたミクロゲル作製用材料を作製することが好ましい。その後、このミクロゲル作製用材料を用いることにより、好適に、ミクロゲルの形態としての有機-無機ハイブリッド粒子を得ることができる。
ここで、上記ミクロゲル作製用材料は、上記有機成分中に、ミクロゲルを形成するための反応性基を有することが好ましく、このような反応性基としては、イソシアネート基を好適に挙げることができる。
マイクロカプセル形成方法は、「マイクロカプセル」(近藤朝士、日刊工業新聞社(1970))及び「マイクロカプセル」(近藤保ら、三共出版(1977))に詳しく記載されている。
次いで、有機溶媒中に、無機粒子を含有するミクロゲル作製用材料と、多官能イソシアネート化合物とを添加し、この有機相溶液を水溶性高分子水溶液中で乳化させ、その後、水相に重合反応促進の触媒を添加するか又は乳化液の温度を上げて多官能イソシアネート化合物を上記の活性水素原子を有する化合物(水など)と重合させることにより、ミクロゲルを形成することができる。また、この有機相溶液中に画像記録層の構成成分を添加することで、画像記録層の構成成分を内包するミクロゲル(マイクロカプセル)とすることもできる。内包する画像記録層の構成成分としては、特にラジカル重合性化合物が好ましい。
有機-無機ハイブリッド粒子がラジカル重合性基を有する形態としては、上記した反応スキーム(A-1)、(A-2)、(A-5)及び(A-6)のように、ラジカル重合性基が有機-無機ハイブリッド粒子における有機成分に結合される形態や、上記反応スキーム(A-7)のように、ラジカル重合性化合物が、マイクロカプセルとしてのミクロゲルの内部に取り込まれる形態を挙げることができる。
一般式(b)において、L1は、m+n価の連結基であり、m及びnは、それぞれ独立に、1乃至100の整数であり、Lcは1価のエチレン性不飽和基であり、そして、Zは求核性基である。
L1は、二価以上の脂肪族基、二価以上の芳香族基、二価以上の複素環基、-O-、-S-、-NH-、-N<、-CO-、-SO-、-SO2-又はそれらの組合せであることが好ましい。
m及びnは、それぞれ独立に、1乃至50の整数であることが好ましく、1乃至20の整数であることがより好ましく、1乃至10の整数であることが更に好ましく、1乃至5の整数であることが最も好ましい。なかでも、mが1~3の整数であり、nが1であることが特に好ましい。
Lcで表される1価のエチレン性不飽和基としては、アリル基、ビニル基、アクリロイル基、メタクリロイル基を挙げることができる。
Zは、OH、SH又はNH2であることが好ましく、OH又はNH2であることが更に好ましく、OHであることが最も好ましい。
また、ミクロゲルの形態である有機-無機ハイブリッド粒子の作製においては、上記ラジカル重合性化合物(i)と、必要に応じて活性水素原子を有する化合物とを共存させることにより、多官能イソシアネートに対してラジカル重合性化合物が付加された付加物を形成することもできる。特に、ラジカル重合性化合物(i)が、ミクロゲルの形成において反応する反応性基(例えば、イソシアネート基など)を有する場合においては、多官能イソシアネートに対して活性水素原子を有する化合物が付加された付加物に対して、更に、ラジカル重合性化合物(i)を付加してもよい(付加物を変性してもよい)。
また、多官能イソシアネートに対してラジカル重合性化合物(i)が付加された付加物と、多官能イソシアネートに対して活性水素原子を有する化合物が付加された付加物とを併用することもできる。
有機-無機ハイブリッド粒子は、その表面に、保護コロイドとして機能する親水性ポリマーを側鎖として有する有機-無機ハイブリッド粒子の態様が、現像性の観点から特に好ましい。
上記ミクロゲル作製用材料と多官能イソシアネートとを水と非混和性の溶剤に溶解させ、この溶液を、イソシアネート基と反応しうる活性水素基を片末端に1つ以上有する親水性ポリマー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り製造してもよいし、上記ミクロゲル作製用材料と多官能イソシアネートと活性水素基を片末端に1つ以上有する親水性ポリマーとを反応させた後に、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してもよい。
イソシアネート基と反応しうる活性水素基を片末端に1つ以上有する親水性ポリマーについて説明する。イソシアネート基と反応しうる活性水素基としてはヒドロキシ基、アミノ基、メルカプト基、カルボキシ基等が挙げられる。このうち特にヒドロキシ基、アミノ基が好ましい。この様な活性水素基を有する親水性ポリマーとしては特に限定されないが、例えば片末端に活性水素基を有するポリオキシアルキレン鎖を有する化合物が挙げられる。
親水性ポリマーの質量平均モル質量(Mw)は、300~500,000であることが好ましく、500~100,000であることが更に好ましい。Mwが300以上50万以下とすることで、保護コロイドとして十分な機能を有し、ポリマー微粒子の分散安定性が確保でき、また、表面の親水性も十分得られる。
なかでも、下記一般式(c)で表される末端アミノ基又は末端ヒドロキシ基を有するポリエーテル誘導体が好ましい。
一般式(c)において、mは0又は1を表す。Aは、アリーレン基又はアルキレン基を表す。Yはアミノ基又はヒドロキシ基を表す。
以上、この様な-(X)m-A-Yで表される基の具体例しては、アミノエチル基、アミノプロピル基、4-アミノベンゾイル基、3-アミノベンゾイル基、4-アミノベンゼンスルホニル基、アミノアセチル基、アミノエチルスルホニル基、ヒドロキシエチル基、ヒドロキシプロピル基、4-ヒドロキシベンゾイル基、3-ヒドロキシベンゾイル基、4-ヒドロキシベンゼンスルホニル基、ヒドロキシアセチル基、ヒドロキシエチルスルホニル基、等が挙げられる。
有機-無機ハイブリッド粒子の粒径は、0.01~20μmが好ましく、0.05~5μmであることがより好ましく、0.1~1μmであることが更に好ましい。
画像記録層は、赤外線吸収剤を含有する。
赤外線吸収剤は、750~1400nmの波長域に極大吸収を有する増感色素であることが好ましい。
赤外線吸収剤は染料又は顔料が好ましく用いられる。
これらの染料のうち特に好ましいものとしては、シアニン色素、スクアリリウム色素、ピリリウム塩、ニッケルチオレート錯体、インドレニンシアニン色素が挙げられる。更に、シアニン色素やインドレニンシアニン色素が好ましく、特に好ましい例として下記一般式(a)で示されるシアニン色素が挙げられる。
画像記録層は、更に、ラジカル重合性化合物を含むことが好ましい。
ラジカル重合性化合物は、好ましくは、少なくとも1個のエチレン性不飽和二重結合を有する付加重合性化合物であり、末端エチレン性不飽和結合を少なくとも1個、好ましくは2個以上有する化合物から選ばれることがより好ましい。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類、不飽和カルボン酸と多価アミン化合物とのアミド類が用いられる。また、ヒドロキシル基、アミノ基、メルカプト基等の求核性置換基を有する不飽和カルボン酸エステル類或いはアミド類と単官能若しくは多官能イソシアネート類或いはエポキシ類との付加反応物、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、エポキシ基等の親電子性置換基を有する不飽和カルボン酸エステル類或いはアミド類と単官能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、トシルオキシ基等の脱離性置換基を有する不飽和カルボン酸エステル類或いはアミド類と単官能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、上記の不飽和カルボン酸を、不飽和ホスホン酸、スチレン、ビニルエーテル等に置き換えた化合物群を使用することも可能である。これらは、特表2006-508380号公報、特開2002-287344号公報、特開2008-256850号公報、特開2001-342222号公報、特開平9-179296号公報、特開平9-179297号公報、特開平9-179298号公報、特開2004-294935号公報、特開2006-243493号公報、特開2002-275129号公報、特開2003-64130号公報、特開2003-280187号公報、特開平10-333321号公報等に記載されている。
(ただし、R104及びR105は、H又はCH3を示す。)
画像記録層は、更に、ラジカル重合開始剤(以下、開始剤化合物とも称する)を含有することが好ましい。
オニウム塩は、750~1400nmの波長域に極大吸収を有する赤外線吸収剤と併用して用いられることが特に好ましい。
上記画像記録層中のラジカル重合開始剤の含有量は、上記画像記録層の全固形分に対し、好ましくは0.01~20質量%、より好ましくは0.1~15質量%、更に好ましくは1.0~10質量%である。
画像記録層は、バインダーを含むことが好ましい。バインダーは、上記画像記録層成分を支持体上に担持可能であり、現像液、又は、印刷インキ及び湿し水の少なくとも一方により除去可能であるものが好ましい。上記バインダーとしては、(メタ)アクリル系重合体、ポリウレタン樹脂、ポリビニルアルコール樹脂、ポリビニルブチラール樹脂、ポリビニルホルマール樹脂、ポリアミド樹脂、ポリエステル樹脂、エポキシ樹脂などが用いられる。特に、(メタ)アクリル系重合体、ポリウレタン樹脂、ポリビニルブチラール樹脂が好ましく用いられ、より好ましくは(メタ)アクリル系重合体、ポリウレタン樹脂、ポリビニルブチラール樹脂である。
上記(メタ)アクリル系重合体の好適な一例としては、酸基を含有する繰り返し単位を有する共重合体が挙げられる。酸基としては、カルボン酸基、スルホン酸基、ホスホン酸基、リン酸基、スルホンアミド基等が挙げられるが、特にカルボン酸基が好ましい。酸基を含有する繰り返し単位としては、(メタ)アクリル酸由来の繰り返し単位や下記一般式(I)で表されるものが好ましく用いられる。
上記R212で表される連結基が有していてもよい置換基としては、水素原子を除く1価の非金属原子団を挙げることができ、ハロゲン原子(-F、-Br、-Cl、-I)、ヒドロキシル基、シアノ基、アルコキシ基、アリーロキシ基、メルカプト基、アルキルチオ基、アリールチオ基、アルキルカルボニル基、アリールカルボニル基、カルボキシル基及びその共役塩基基、アルコキシカルボニル基、アリーロキシカルボニル基、カルバモイル基、アリール基、アルケニル基、アルキニル基等が挙げられる。
n211は1~3であることが好ましく、1又は2であることがより好ましく、1であることが特に好ましい。
本発明に用いられる(メタ)アクリル系重合体は更に架橋性基を有することが好ましい。ここで架橋性基とは、平版印刷版原版を露光した際に画像記録層中で起こるラジカル重合反応の過程で上記バインダーを架橋させる基のことである。このような機能の基であれば特に限定されないが、例えば、付加重合反応し得る官能基としてエチレン性不飽和結合基、アミノ基、エポキシ基等が挙げられる。また光照射によりラジカルになり得る官能基であってもよく、そのような架橋性基としては、例えば、チオール基、ハロゲン基等が挙げられる。なかでも、エチレン性不飽和結合基が好ましい。エチレン性不飽和結合基としては、スチリル基、(メタ)アクリロイル基、アリル基が好ましい。
上記バインダー中の酸基の一部が、塩基性化合物で中和されていてもよい。塩基性化合物としては、塩基性窒素を含有する化合物やアルカリ金属水酸化物、アルカリ金属の4級アンモニウム塩などが挙げられる。
上記バインダーは単独で用いても2種以上を混合して用いてもよい。
上記バインダーの含有量は、良好な画像部の強度と画像形成性の観点から、上記画像記録層の全固形分に対して、5~75質量%が好ましく、10~70質量%がより好ましく、10~60質量%が更に好ましい。
また、上記ラジカル重合性化合物及び上記バインダーの合計含有量は、上記画像記録層の全固形分に対して、90質量%以下が好ましい。90質量%を超えると、感度の低下、現像性の低下を引き起こす場合がある。より好ましくは35~80質量%である。
上記画像記録層は、耐刷性を低下させることなく機上現像性を向上させるために、低分子親水性化合物を含有してもよい。
上記低分子親水性化合物としては、例えば、水溶性有機化合物としては、エチレングリコール、ジエチレングリコール、トリエチレングリコール、プロピレングリコール、ジプロピレングリコール、トリプロピレングリコール等のグリコール類及びそのエーテル又はエステル誘導体類、グリセリン、ペンタエリスリトール、トリス(2-ヒドロキシエチル)イソシアヌレート等のポリオール類、トリエタノールアミン、ジエタノールアミン、モノエタノールアミン等の有機アミン類及びその塩、アルキルスルホン酸、トルエンスルホン酸、ベンゼンスルホン酸等の有機スルホン酸類及びその塩、アルキルスルファミン酸等の有機スルファミン酸類及びその塩、アルキル硫酸、アルキルエーテル硫酸等の有機硫酸類及びその塩、フェニルホスホン酸等の有機ホスホン酸類及びその塩、酒石酸、シュウ酸、クエン酸、リンゴ酸、乳酸、グルコン酸、アミノ酸類等の有機カルボン酸類及びその塩、ベタイン類等が挙げられる。
上記画像記録層には、着肉性を向上させるために、ホスホニウム化合物、含窒素低分子化合物、アンモニウム基含有ポリマーなどの感脂化剤を含有させることができる。特に、保護層が無機質の層状化合物を含有する場合、感脂化剤は、無機質の層状化合物の表面被覆剤として機能し、無機質の層状化合物による印刷途中の着肉性低下を防止する。
30%ポリマー溶液3.33g(固形分として1g)を、20mlのメスフラスコに秤量し、N-メチルピロリドンでメスアップする。この溶液を30℃の恒温槽で30分間静置し、ウベローデ還元粘度管(粘度計定数=0.010cSt/s)に入れて30℃にて流れ落ちる時間を測定する。なお測定は同一サンプルで2回測定し、その平均値を算出する。同様にブランク(N-メチルピロリドンのみ)の場合も測定し、下記式から還元比粘度(ml/g)を算出する。
(1)2-(トリメチルアンモニオ)エチルメタクリレート=p-トルエンスルホナート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比10/90 質量平均分子量4.5万)
(2)2-(トリメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比20/80 質量平均分子量6.0万)
(3)2-(エチルジメチルアンモニオ)エチルメタクリレート=p-トルエンスルホナート/ヘキシルメタクリレート共重合体(モル比30/70 質量平均分子量4.5万)
(4)2-(トリメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/2-エチルヘキシルメタクリレート共重合体(モル比20/80 質量平均分子量6.0万)
(5)2-(トリメチルアンモニオ)エチルメタクリレート=メチルスルファート/ヘキシルメタクリレート共重合体(モル比40/60 質量平均分子量7.0万)
(6)2-(ブチルジメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比 25/75 質量平均分子量6.5万)
(7)2-(ブチルジメチルアンモニオ)エチルアクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比20/80 質量平均分子量6.5万)
(8)2-(ブチルジメチルアンモニオ)エチルメタクリレート=13-エチル-5,8,11-トリオキサ-1-ヘプタデカンスルホナート/3,6-ジオキサヘプチルメタクリレート共重合体(モル比20/80 質量平均分子量7.5万)
(9)2-(ブチルジメチルアンモニオ)エチルメタクリレート=ヘキサフルオロホスファート/3,6-ジオキサヘプチルメタクリレート/2-ヒドロキシ-3-メタクロイルオキシプロピルメタクリレート共重合体(モル比15/80/5 質量平均分子量6.5万)
上記画像記録層には、機上現像性を向上させるため、疎水化前駆体を含有させることができる。疎水化前駆体とは、熱が加えられたときに上記画像記録層を疎水性に変換できる微粒子を意味する。微粒子としては、疎水性熱可塑性ポリマー微粒子、熱反応性ポリマー微粒子、重合性基を有するポリマー微粒子、疎水性化合物を内包しているマイクロカプセル及びミクロゲル(架橋ポリマー微粒子)から選ばれる少なくとも1つであることが好ましい。なかでも、重合性基を有するポリマー微粒子及びミクロゲルが好ましい。
このようなポリマー微粒子を構成するポリマーの具体例としては、エチレン、スチレン、塩化ビニル、アクリル酸メチル、アクリル酸エチル、メタクリル酸メチル、メタクリル酸エチル、塩化ビニリデン、アクリロニトリル、ビニルカルバゾール、ポリアルキレン構造を有するアクリレート又はメタクリレートなどのモノマーのホモポリマー若しくはコポリマー又はそれらの混合物を挙げることができる。その中で、より好適なものとして、ポリスチレン、スチレン及びアクリロニトリルを含む共重合体、ポリメタクリル酸メチルを挙げることができる。
画像記録層は、耐刷性向上の観点から、還元剤を含有することができる。還元剤の例としては以下の5種が好ましく挙げられる。
ボレート塩化合物としては、例えば、特開昭62-143044号、特開昭62-150242号、特開平9-188685号、特開平9-188686号、特開平9-188710号、特開2000-131837、特開2002-107916、特許第2764769号、特開2002-116539号等の各公報、及び、Kunz,Martin “Rad Tech’98.Proceeding April 19-22,1998,Chicago”等に記載される有機ホウ酸塩が好ましい。
(iv)含錫化合物:上述のアミン類の窒素原子を錫原子に置き換えたものが、同様の作用により活性ラジカルを生成し得る。
(v)スルフィン酸塩類:酸化により活性ラジカルを生成し得る。具体的は、アリールスルフィン駿ナトリウム等を挙げることができる。
還元剤の含有量は、画像記録層の全固形分に対し、0.01~30質量%が好ましく、0.05~25質量%がより好ましく、0.1~20質量%が更に好ましい。
上記画像記録層は、連鎖移動剤を含有することが好ましい。連鎖移動剤は、例えば高分子辞典第三版(高分子学会編、2005年)683-684頁に定義されている。連鎖移動剤としては、例えば、分子内にSH、PH、SiH、GeHを有する化合物群が用いられる。これらは、低活性のラジカル種に水素供与して、ラジカルを生成するか、若しくは、酸化された後、脱プロトンすることによりラジカルを生成しうる。上記画像記録層には、特に、チオール化合物(例えば、2-メルカプトベンズイミダゾール類、2-メルカプトベンズチアゾール類、2-メルカプトベンズオキサゾール類、3-メルカプトトリアゾール類、5-メルカプトテトラゾール類等)を好ましく用いることができる。
本発明の平板印刷版原版における上記画像記録層は、形成方法に特に制限はなく、公知の方法で形成されることができる。上記画像記録層は、必要な上記各画像記録層成分を溶剤に分散又は溶解して塗布液を調製し、塗布して形成される。使用する溶剤としては、メチルエチルケトン、エチレングリコールモノメチルエーテル、1-メトキシ-2-プロパノール、2-メトキシエチルアセテート、1-メトキシ-2-プロピルアセテート、γ-ブチルラクトン等を挙げることができるが、これに限定されるものではない。溶剤は、単独又は混合して使用される。塗布液の固形分濃度は、好ましくは1~50質量%である。
上記(A)有機-無機ハイブリッド粒子を画像記録層に含有させるには、上記(A)有機-無機ハイブリッド粒子を、例えば、(A)有機-無機ハイブリッド粒子の水分散液を調製後、他成分含有溶液と混合することにより行うことができる。
本発明の平版印刷版原版に用いられる支持体は、特に限定されず、寸度的に安定な板状の親水性支持体であればよい。支持体としては、特に、アルミニウム板が好ましい。アルミニウム板を使用するに先立ち、粗面化処理、陽極酸化処理等の表面処理を施すことが好ましい。アルミニウム板表面の粗面化処理は、種々の方法により行われるが、例えば、機械的粗面化処理、電気化学的粗面化処理(電気化学的に表面を溶解させる粗面化処理)、化学的粗面化処理(化学的に表面を選択溶解させる粗面化処理) が挙げられる。これらの処理については、特開2007-206217号の段落番号〔0241〕~〔0245〕に記載された方法を好ましく用いることができる。
上記支持体は、中心線平均粗さが0.10~1.2μmであることが好ましい。この範囲で、上記画像記録層との良好な密着性、良好な耐刷性と良好な汚れ難さが得られる。
また、上記支持体の色濃度は、反射濃度値で0.15~0.65が好ましい。この範囲で、画像露光時のハレーション防止による良好な画像形成性と現像後の良好な検版性が得られる。
上記支持体の厚さは0.1~0.6mmであるのが好ましく、0.15~0.4mmであるのがより好ましく、0.2~0.3mmであるのが更に好ましい。
本発明の平版印刷版原版においては、非画像部領域の親水性を向上させ印刷汚れを防止するために、支持体表面の親水化処理を行うことも好適である。
支持体表面の親水化処理としては、支持体をケイ酸ナトリウム等の水溶液に浸漬処理又は電解処理するアルカリ金属シリケート処理、フッ化ジルコン酸カリウムで処理する方法、ポリビニルホスホン酸で処理する方法等が挙げられるが、ポリビニルホスホン酸水溶液に浸漬処理する方法が好ましく用いられる。
本発明の平版印刷版原版においては、非画像部領域の親水性を向上させ印刷汚れを防止するために、支持体と画像記録層との間に下塗り層を設けることも好適である。
本発明の平版印刷版原版が下塗り層を有している場合、上記下塗り層に用いる化合物としては、特開平10-282679号公報に記載されている付加重合可能なエチレン性二重結合反応基を有しているシランカップリング剤、特開平2-304441号公報記載のエチレン性二重結合反応基を有しているリン化合物などが好適に挙げられる。特に好ましい化合物として、メタクリル基、アリル基などの重合性基とスルホン酸基、リン酸基、リン酸エステルなどの支持体吸着性基を有する化合物が挙げられる。重合性基と支持体吸着性基に加えてエチレンオキシド基などの親水性付与基を有する化合物も好適な化合物として挙げることができる。
上記下塗り層は、水又はメタノール、エタノール、メチルエチルケトンなどの有機溶剤若しくはそれらの混合溶剤に上記化合物を溶解させた溶液を支持体上に塗布、乾燥する方法、又は、水、あるいは、メタノール、エタノール、メチルエチルケトンなどの有機溶剤若しくはそれらの混合溶剤に上記化合物を溶解させた溶液に、支持体を浸漬して上記化合物を吸着させ、しかる後、水などによって洗浄、乾燥する方法によって設けることができる。前者の方法では、上記化合物の濃度0.005~10質量%の溶液を種々の方法で塗布できる。
例えば、バーコーター塗布、回転塗布、スプレー塗布、カーテン塗布などいずれの方法を用いてもよい。また、後者の方法では、溶液の濃度は0.01~20質量%、好ましくは0.05~5質量%であり、浸漬温度は20~90℃、好ましくは25~50℃であり、浸漬時間は0.1秒~20分、好ましくは2秒~1分である。
上記下塗り層の塗布量(固形分)は、0.1~100mg/m2であるのが好ましく、1~30mg/m2であるのがより好ましい。
本発明の平版印刷版原版には、露光時の重合反応を妨害する酸素の拡散侵入を遮断するため、上記画像記録層上に保護層(酸素遮断層)を設けることが好ましい。上記保護層の材料としては、水溶性ポリマー、水不溶性ポリマーのいずれをも適宜選択して使用することができ、必要に応じて2種類以上を混合して使用することもできる。具体的には、例えば、ポリビニルアルコール、変性ポリビニルアルコール、ポリビニルピロリドン、水溶性セルロース誘導体、ポリ(メタ)アクリロニトリル等が挙げられる。これらの中で、比較的結晶性に優れた水溶性高分子化合物を用いることが好ましい。具体的には、ポリビニルアルコールを主成分として用いることが、酸素遮断性、現像除去性といった基本特性的に特に良好な結果を与える。
本発明の平版印刷版原版は、必要に応じて、上記支持体の裏面にバックコート層を設けることができる。上記バックコート層としては、例えば、特開平5-45885号公報に記載されている有機高分子化合物、特開平6-35174号公報に記載されている有機金属化合物又は無機金属化合物を加水分解及び重縮合させて得られる金属酸化物からなる被覆層が好適に挙げられる。中でも、Si(OCH3)4、Si(OC2H5)4、Si(OC3H7)4、Si(OC4H9)4等のケイ素のアルコキシ化合物を用いることが、原料が安価で入手しやすい点で好ましい。
本発明は、(a)水酸基を有する無機粒子と、(b)有機成分とが、(c)ウレタン結合或いはウレア結合を有する連結基を介して連結した、有機-無機ハイブリッド粒子であり、上記(b)有機成分が、少なくとも2つの上記(a)無機粒子と連結し、上記(a)無機粒子が、少なくとも2つの上記(b)有機成分と連結して、有機成分及び無機粒子がネットワーク構造を形成した、有機-無機ハイブリッド粒子にも関する。
上記有機-無機ハイブリッド粒子の詳細説明は上述した通りであるが、本発明の有機-無機ハイブリッド粒子においては、(b)有機成分は、(d)多官能イソシアネートと、(e)活性水素原子を有する化合物との反応生成物であることが好ましい。また、(b)有機成分は、上記一般式(1)で表される繰り返し単位を有することが好ましい。また、本発明の有機-無機ハイブリッド粒子は、更に、ラジカル重合性基を有することが好ましい。更に、本発明の有機-無機ハイブリッド粒子の粒径は、0.01~20μmであることが好ましい。
本発明の平版印刷版原版を画像露光して現像処理を行うことで平版印刷版を製造することができる。
本発明の第一の好適な実施形態に係る平版印刷版の作製方法は、本発明の平版印刷版原版を露光した後、pH2~12の現像液により未露光部を除去する、平版印刷版の作製方法である。
本発明の第二の好適な実施形態に係る平版印刷版の作製方法は、本発明の平版印刷版原版を露光した後、印刷機上で印刷インキ及び湿し水の少なくとも一方により未露光部を除去する、平版印刷版の作製方法である。
以下、本発明の平版印刷版の作製方法について、各工程の好ましい態様を順に説明する。
本発明の平版印刷版の作製方法は、本発明の平版印刷版原版を露光する露光工程を含む。本発明の平版印刷版原版は、線画像、網点画像等を有する透明原画を通してレーザー露光するかデジタルデータによるレーザー光走査等で画像様に露光されることが好ましい。
光源の波長は、750~1400nmが好ましく用いられる。750~1400nmの光源としては、赤外線を放射する固体レーザー及び半導体レーザーが好適である。赤外線レーザーに関しては、出力は100mW以上であることが好ましく、1画素当たりの露光時間は20マイクロ秒以内であるのが好ましく、また照射エネルギー量は10~300mJ/cm2であるのが好ましい。また、露光時間を短縮するためマルチビームレーザーデバイスを用いることが好ましい。露光機構は、内面ドラム方式、外面ドラム方式、フラットベッド方式等の何れでもよい。
画像露光は、プレートセッターなどを用いて常法により行うことができる。機上現像の場合には、平版印刷版原版を印刷機に装着した後、印刷機上で画像露光を行ってもよい。
現像処理は、(1)pHが2~14(好ましくは2~12)の現像液により未露光部を除去する方法(現像液処理方式)、又は(2)印刷機上で印刷インキ及び湿し水の少なくとも一方により未露光部を除去する方法(機上現像方式)で行うことができる。
現像液処理方式においては、画像露光された平版印刷版原版は、pHが2~14の現像液により処理され、未露光部が除去されて平版印刷版が作製される。
高アルカリ性現像液(pH12以上)を用いる現像処理においては、通常、前水洗工程により保護層を除去し、次いでアルカリ現像を行い、後水洗工程でアルカリを水洗除去し、ガム液処理を行い、乾燥工程で乾燥して平版印刷版が作製される。
本発明の第一の好ましい態様によれば、pHが2~12の現像液が使用される。すなわち、この態様においては、画像記録層は、露光後にpH2~12の現像液により未露光部が除去されるものである。この態様においては、現像液中に界面活性剤又は水溶性高分子化合物を含有させることが好ましく、これにより現像とガム液処理を同時に行うことが可能となる。よって後水洗工程は特に必要とせず、1液で現像-ガム液処理を行うことができる。
更に、前水洗工程も特に必要とせず、保護層の除去も現像-ガム液処理と同時に行うことができる。本発明の平板印刷版の作製方法では、現像-ガム処理の後に、例えば、スクイズローラーを用いて余剰の現像液を除去した後、乾燥を行うことが好ましい。
機上現像方式においては、画像露光された平版印刷版原版は、印刷機上で印刷インキ及び湿し水の少なくとも一方を供給し、未露光部が除去されて平版印刷版が作製される。すなわち、この態様においては、画像記録層は、露光後に印刷機上で印刷インキ及び湿し水の少なくとも一方により未露光部が除去されるものである。
この態様においては、平版印刷版原版を露光後、なんらの現像処理を施すことなくそのまま印刷機に装着するか、あるいは、平版印刷版原版を印刷機に装着した後、印刷機上で露光し、ついで、印刷インキ及び湿し水を供給して印刷すると、印刷途上の初期の段階で、未露光部においては、供給された印刷インキ及び湿し水の少なくとも一方によって、未硬化の画像記録層が溶解又は分散して除去され、その部分に親水性の表面が露出する。一方、露光部においては、露光により硬化した画像記録層が、親油性表面を有する油性インキ受容部を形成する。最初に版面に供給されるのは、印刷インキでもよく、湿し水でもよいが、湿し水が除去された画像記録層成分によって汚染されることを防止する点で、最初に印刷インキを供給することが好ましい。このようにして、平版印刷版原版は印刷機上で機上現像され、そのまま多数枚の印刷に用いられる。
なお、高分子化合物において、特別に規定したもの以外は、分子量はGPC法によるポリスチレン換算値とした質量平均モル質量(Mw)であり、繰り返し単位の比率はモル百分率である。
(合成例1)
水酸基を有する無機粒子として、メチル-エチルケトン(MEK)分散シリカ粒子(ライトスターLA-OS263BK、粒径300nm、日産化学工業(株)製)を使用した。シリカ粒子のMEK分散液(25質量%)を20g秤量し、MEKを減圧留去した。トルエン50g、2,2,6,6-テトラメチルピペリジン-1-オキシル10mgを加えた後、有機修飾の為のカップリング剤として2-イソシアナトエチルメタクリレート4.65g(30mmol)を添加した。更にビスマストリス(2-エチルヘキサノエート)(ネオスタンU-600、日東化成(株)製)50mgを加えた後、80℃で20時間攪拌した。室温まで冷却後、遠心分離によりシリカ粒子を沈降させ上澄みを除去した。酢酸エチル50gを加えて攪拌した後、遠心分離によりシリカ粒子を沈降させる操作を2回繰り返した後、酢酸エチル20gを加える事で、有機-無機ハイブリッド粒子S-1の20質量%酢酸エチル溶液を得た。有機-無機ハイブリッド粒子S-1の粒径を光散乱法により測定したところ、0.32μmであった。
カップリング剤として、2-イソシアナトエトキシエチルメタクリレート5.98g(30mmol)を使用した以外は、合成例1と同様にして、有機-無機ハイブリッド粒子S-2の20質量%酢酸エチル溶液を得た。有機-無機ハイブリッド粒子S-2の粒径を光散乱法により測定したところ、0.33μmであった。
無機粒子の種類、カップリング剤の種類を下記表1に示すように変更した以外は、合成例1と同様にして、有機-無機ハイブリッド粒子S-3~S-8を合成した。得られた有機-無機ハイブリッド粒子の粒径についても表1に記載した。
水酸基を有する無機粒子として、メチル-エチルケトン(MEK)分散シリカ粒子(ライトスターLA-OS263BK、日産化学工業(株)製)を使用した。シリカ粒子のMEK分散液(25質量%)を20g秤量し、MEKを減圧留去した。トルエン50g、2,2,6,6-テトラメチルピペリジン-1-オキシル10mgを加えた後、有機修飾の為のカップリング剤として、トリメトキシシリルプロピルアクリレート5.0g(21.3mmol)及び下記化合物T-1 5.0g(約1.2mmol)を添加した。トリアミルアミン100mgを加えた後、12時間還流した。室温まで冷却後、遠心分離によりシリカ粒子を沈降させ上澄みを除去した。酢酸エチル50gを加えて攪拌した後、遠心分離によりシリカ粒子を沈降させる操作を2回繰り返してシリカ粒子を洗浄した。同様に蒸留水50gで洗浄した後、蒸留水20gを加える事で、有機-無機ハイブリッド粒子S-9の20質量%水溶液を得た。有機-無機ハイブリッド粒子S-9の粒径を光散乱法により測定したところ、0.33μmであった。
無機粒子の種類、カップリング剤の種類を下記表2に示すように変更した以外は、合成例9と同様にして、有機-無機ハイブリッド粒子S-10~S-15、及びR-1を合成した。なお、S-14とS-15については、20質量%水溶液ではなく、20質量%酢酸エチル溶液として調製した。得られた有機-無機ハイブリッド粒子の粒径についても表2に記載した。
イソホロンジイソシアネート(IPDI)71.13g(0.32mol)と、少なくとも2つの活性水素原子を有する化合物(下記構造P-1)30.12g(0.08mol)との酢酸エチル(101.25g)懸濁溶液にビスマストリス(2-エチルヘキサノエート)(ネオスタンU-600、日東化成(株)製)170mgを加えて攪拌した。発熱が収まった時点で反応温度を50℃に設定し、3時間攪拌した。以上の操作により、多価イソシアネート付加物(NCO-1)の酢酸エチル溶液(50質量%)を得た。
上記合成例16において、上記P-1及びイソホロンジイソシアネートを、それぞれ、下記表3に示す少なくとも2つの活性水素原子を有する化合物P及び多価イソシアネート化合物Iに変更した以外は、合成例16と同様の方法により、多価イソシアネート付加物(NCO-2~NCO-18)の溶液を得た。
下記に示す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12000rpmで10分間乳化した。得られた乳化物を45℃で4時間攪拌後、U-CAT SA102(1,8-ジアザビシクロ[5.4.0]ウンデカ-7-エン-オクチル酸塩、サンアプロ社製)の10質量%水溶液5.20gを加え、室温で30分攪拌し、45℃で24時間静置した。このようにして得られた有機-無機ハイブリッド粒子液の固形分濃度を、蒸留水で20質量%になるように調整し、これを有機-無機ハイブリッド粒子S-16とした。光散乱法により平均粒径を測定したところ、0.28μmであった。
(成分1)酢酸エチル 0.75g
(成分2)トリメチロールプロパン(6モル)とキシレンジイソシアネート(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返し数は90)を付加させた付加体(三井化学製:50質量%酢酸エチル溶液 3.76g
(成分3)多価イソシアネート付加物NCO-1 (50質量%酢酸エチル溶液として) 7.5g
(成分4)有機-無機ハイブリッド粒子S-6 (20質量%酢酸エチル溶液として) 18.75g
(成分5)SR-399(ジペンタエリスリトールペンタアクリレートエステル、サートマー製)の65質量%酢酸エチル溶液 11.54g
(成分6)パイオニンA-41C(スルホン酸塩型界面活性剤、竹本油脂製)の10質量%酢酸エチル溶液 4.42g
蒸留水 46.87g
合成例34において、使用した成分1及び3~5の種類、添加量を下記表4に示す様に変更した以外は、合成例34と同様にして、有機-無機ハイブリッド粒子S-17~44及びR-2~R-7を得た。
1.機上現像型平版印刷版原版の作製方法A(実施例1~52及び比較例1~9用)
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板表面を砂目立てして、水でよく洗浄した。アルミニウム板を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。砂目立て表面のエッチング量は約3g/m2であった。
次に、アルミニウム板に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A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A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Bを作製した。Siの付着量は10mg/m2であった。この支持体の中心線平均粗さ(Ra)を直径2μmの針を用いて測定したところ、0.51μmであった。
次に、上記支持体B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、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、下記画像記録層塗布液(1)をバー塗布し、100℃、60秒でオーブン乾燥して乾燥塗布量1.0g/m2の画像記録層を形成した。
画像記録層塗布液(1)は下記感光液及び粒子分散液を塗布直前に混合し攪拌することにより作製した。
・バインダーポリマー(1)〔下記構造〕 0.240g
・重合開始剤(1): 0.245g
・一般式(X-1)で表されるシアニン色素 0.023g
・ボレート化合物 0.010g
TPB〔下記構造〕 (添加する場合)
・重合性モノマー 0.192g
下記に示す(M-1)~(M-4)の何れかを使用
・低分子親水性化合物 0.062g
トリス(2-ヒドロキシエチル)イソシアヌレート
・低分子親水性化合物(1)〔下記構造〕 0.050g
・感脂化剤 0.055g
ホスホニウム化合物(1)〔下記構造〕
・感脂化剤 0.018g
ベンジル-ジメチル-オクチルアンモニウム・PF6塩
・感脂化剤 0.035g
アンモニウム基含有ポリマー
〔下記構造、還元比粘度44ml/g〕
・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
・本発明の有機-無機ハイブリッド粒子S又は比較用粒子R
1.980g
・蒸留水 2.425g
上記画像記録層上に、更に下記組成の保護層塗布液をバー塗布し、120℃、60秒でオーブン乾燥して、乾燥塗布量が0.15g/m2の保護層を形成して実施例1~52及び比較例1~9用の平版印刷版原版を作製した。
・無機層状化合物分散液(1) 1.5g
・ポリビニルアルコール(日本合成化学工業(株)製CKS50、スルホン酸変性、
けん化度99モル%以上、重合度300)6質量%水溶液 0.55g
・ポリビニルアルコール((株)クラレ製PVA-405、
けん化度81.5モル%、重合度500)6質量%水溶液 0.03g
・ポリオキシエチレンラウリルエーテル(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
<無機層状化合物分散液(1)の調製>
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。
上記機上現像型平版印刷版原板Aと同様に支持体上に下塗り層を形成し、この下塗り層上に、下記組成の画像記録層塗布液(2)をバー塗布し、70℃、60秒でオーブン乾燥して、乾燥塗布量0.6g/m2の画像記録層を形成して、実施例53~78及び比較例10~17用の保護層を有さない平版印刷版原版を作製した。
・上記一般式(X-1)で表されるシアニン色素 0.020g
・上記重合開始剤(1): 0.245g
・ボレート化合物 0.010g
TPB〔上記構造〕 (添加する場合)
・本発明の有機-無機ハイブリッド粒子S又は比較用粒子R 11.0g
・重合性モノマー 1.50g
上記(M-1)~(M-4)の何れかを使用
・メルカプト-3-トリアゾール 0.2g
・Byk 336(Byk Chemie社製 0.4g
・KlucelM(Hercules社製) 4.8g
・ELVACITE 4026(Ineos Acrylics社製)
2.5g
・n-プロパノール 55.0g
・2-ブタノン 17.0g
得られた機上現像型平版印刷版原版について、機上現像性、着肉性及び耐刷性を以下のようにして評価した。
平版印刷版原版を赤外線半導体レーザー搭載の富士フイルム(株)製Luxel PLATESETTER T-6000IIIにて、外面ドラム回転数1000rpm、レーザー出力70%、解像度2400dpiの条件で露光した。露光画像にはベタ画像及び20μmドットFMスクリーンの50%網点チャートを含むようにした。
露光済み平版印刷版原版を現像処理することなく、(株)小森コーポレーション製印刷機LITHRONE26の版胴に取り付けた。Ecolity-2(富士フイルム(株)製)/水道水=2/98(容量比)の湿し水とValues-G(N)墨インキ(大日本インキ化学工業(株)製)とを用い、LITHRONE26の標準自動印刷スタート方法で湿し水とインキとを供給し、毎時10000枚の印刷速度で、特菱アート(76.5kg)紙に100枚印刷を行った。
印刷機上で画像記録層の未露光部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評価した。枚数が少ない程、機上現像性が良好であることを表す。
上記平版印刷版原版を60℃で3日間保管し、その後同様に、上記機上現像性の評価を行った。
上記の機上現像性評価後、耐刷性評価を始める前に一旦印刷機を停止し、100枚目の印刷物上、インキ練りローラ上、ブランケット上、版上に現像カス(固体の現像除去物)が付着しているかどうかを、マイクロスコープ(VHX-100、ズームレンズVH-Z150、(株)キーエンス製)を用い、500倍の倍率で観察した。その結果を下記指標にて評価した。結果を下記表5~8に示す。
A:現像カス付着全くなし
B:数十μm以下の現像カスがごくわずかに付着。許容レベル
C:50μm以上の現像カスが付着しNGレベル
D:100μm以上の現像カスが付着し肉眼でも現像カスを容易に確認可能で劣悪
印刷枚数を増やしていくと徐々に感光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%低下した時を刷了とみなし、刷了までの印刷部数を確認した。刷了までの印刷部数が5万枚の時を100点とする相対耐刷性で評価した。点数が高い程、耐刷性が良好であることを表す。評価結果を表5~8に示す。
相対耐刷性=(対象原版の印刷部数) / 50,000 × 100 (点)
本出願は、2015年7月30日出願の日本特許出願(特願2015-151209)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 (20)
- 親水性支持体上に、(A)有機-無機ハイブリッド粒子、及び、(B)赤外線吸収剤を含有する画像記録層を有する平版印刷版原版であって、前記(A)有機-無機ハイブリッド粒子が、(a)水酸基を有する無機粒子と、(b)有機成分とが、(c)ウレタン結合或いはウレア結合を有する連結基を介して連結した、有機-無機ハイブリッド粒子である、平版印刷版原版。
- 前記(A)有機-無機ハイブリッド粒子は、前記(b)有機成分が、1つの前記(a)無機粒子とのみに連結した粒子である、請求項1に記載の平版印刷版原版。
- 前記(A)有機-無機ハイブリッド粒子は、前記(b)有機成分が、少なくとも2つの前記(a)無機粒子と連結し、前記(a)無機粒子が、少なくとも2つの前記(b)有機成分と連結して、前記(b)有機成分及び無機粒子がネットワーク構造を形成した粒子である、請求項1に記載の平版印刷版原版。
- 前記(b)有機成分が、(d)多官能イソシアネートと、(e)活性水素原子を有する化合物との反応生成物である、請求項3に記載の平版印刷版原版。
- 前記(d)多官能イソシアネートが、多官能イソシアネートと、少なくとも2つの活性水素原子を有する化合物との付加物から形成される、請求項4に記載の平版印刷版原版。
- 前記(A)有機-無機ハイブリッド粒子が、ラジカル重合性基を有する、請求項1~6の何れか1項に記載の平版印刷版原版。
- 前記(a)無機粒子が、シリカ、アルミナ、チタニア、ジルコニア、酸化マグネシウム、酸化亜鉛、タルク、クレー、ウォラストナイト、ゾノライト、水酸化アルミニウム、及び、水酸化マグネシウムからなる群より選ばれる少なくとも1種以上の粒子である、請求項1~7の何れか1項に記載の平版印刷版原版。
- 前記(a)無機粒子の粒径が0.005~5μmである、請求項1~8の何れか1項に記載の平版印刷版原版。
- 前記(A)有機-無機ハイブリッド粒子の粒径が、0.01~20μmである、請求項1~9の何れか1項に記載の平版印刷版原版。
- 前記画像記録層が、更に、(C)ラジカル重合性化合物、及び(D)ラジカル重合開始剤を含む、請求項1~10の何れか1項に記載の平版印刷版原版。
- 前記画像記録層は、露光後にpH2~12の現像液により未露光部が除去される、請求項1~11の何れか1項に記載の平版印刷版原版。
- 前記画像記録層は、露光後に印刷機上で印刷インキ及び湿し水の少なくとも一方により未露光部が除去される、請求項1~11の何れか1項に記載の平版印刷版原版。
- 請求項1~12の何れか1項に記載の平版印刷版原版を露光した後、pH2~12の現像液により未露光部を除去する、平版印刷版の作製方法。
- 請求項1~11及び13の何れか1項に記載の平版印刷版原版を露光した後、印刷機上で印刷インキ及び湿し水の少なくとも一方により未露光部を除去する、平版印刷版の作製方法。
- (a)水酸基を有する無機粒子と、(b)有機成分とが、(c)ウレタン結合或いはウレア結合を有する連結基を介して連結した、有機-無機ハイブリッド粒子であり、前記(b)有機成分が、少なくとも2つの前記(a)無機粒子と連結し、前記(a)無機粒子が、少なくとも2つの前記(b)有機成分と連結して、有機成分及び無機粒子がネットワーク構造を形成した、有機-無機ハイブリッド粒子。
- 前記(b)有機成分が、(d)多官能イソシアネートと、(e)活性水素原子を有する化合物との反応生成物である、請求項16に記載の有機-無機ハイブリッド粒子。
- 更に、ラジカル重合性基を有する、請求項16~18のいずれか1項に記載の有機-無機ハイブリッド粒子。
- 粒径が、0.01~20μmである、請求項16~19の何れか1項に記載の有機-無機ハイブリッド粒子。
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US15/882,261 US20180321586A1 (en) | 2015-07-30 | 2016-07-15 | Planographic printing plate precursor, method of preparing planographic printing plate, and organic-inorganic hybrid particle |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020045587A1 (ja) * | 2018-08-31 | 2020-03-05 | 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、平版印刷方法、及び、硬化性組成物 |
WO2020045586A1 (ja) * | 2018-08-31 | 2020-03-05 | 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、平版印刷方法、及び、硬化性組成物 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006276768A (ja) * | 2005-03-30 | 2006-10-12 | Kodak Polychrome Graphics Japan Ltd | 感光性平版印刷版 |
JP2006317716A (ja) * | 2005-05-12 | 2006-11-24 | Eastman Kodak Co | 変性シリカ粒子並びにそれを含む感光性組成物及び感光性平版印刷版 |
JP2008230208A (ja) * | 2007-03-23 | 2008-10-02 | Fujifilm Corp | 機上現像可能な平版印刷版原版 |
JP2010102322A (ja) * | 2008-09-26 | 2010-05-06 | Fujifilm Corp | 平版印刷版の製版方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100621962B1 (ko) * | 2004-06-18 | 2006-09-14 | 한국과학기술연구원 | 높은 제타 전위를 갖는 전기영동성 유무기 복합입자의제조 방법 |
CN101195312B (zh) * | 2006-12-04 | 2011-08-03 | 广州慧谷化学有限公司 | 亲水性分散液及采用这种分散液的印刷版基 |
US8043787B2 (en) * | 2008-03-14 | 2011-10-25 | Eastman Kodak Company | Negative-working imageable elements with improved abrasion resistance |
JP2011095709A (ja) * | 2009-09-30 | 2011-05-12 | Fujifilm Corp | 硬化性組成物、硬化性フィルム、硬化性積層体、永久パターン形成方法、及びプリント基板 |
JP5579217B2 (ja) * | 2012-03-27 | 2014-08-27 | 富士フイルム株式会社 | 平版印刷版原版 |
JP5786099B2 (ja) * | 2012-09-26 | 2015-09-30 | 富士フイルム株式会社 | 平版印刷版原版及び平版印刷版の製版方法 |
-
2016
- 2016-07-15 CN CN201680044716.9A patent/CN107921807A/zh active Pending
- 2016-07-15 US US15/882,261 patent/US20180321586A1/en not_active Abandoned
- 2016-07-15 WO PCT/JP2016/071067 patent/WO2017018262A1/ja active Application Filing
- 2016-07-15 EP EP16830367.5A patent/EP3330096A4/en not_active Withdrawn
- 2016-07-15 JP JP2017530793A patent/JPWO2017018262A1/ja not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006276768A (ja) * | 2005-03-30 | 2006-10-12 | Kodak Polychrome Graphics Japan Ltd | 感光性平版印刷版 |
JP2006317716A (ja) * | 2005-05-12 | 2006-11-24 | Eastman Kodak Co | 変性シリカ粒子並びにそれを含む感光性組成物及び感光性平版印刷版 |
JP2008230208A (ja) * | 2007-03-23 | 2008-10-02 | Fujifilm Corp | 機上現像可能な平版印刷版原版 |
JP2010102322A (ja) * | 2008-09-26 | 2010-05-06 | Fujifilm Corp | 平版印刷版の製版方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3330096A4 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020045587A1 (ja) * | 2018-08-31 | 2020-03-05 | 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、平版印刷方法、及び、硬化性組成物 |
WO2020045586A1 (ja) * | 2018-08-31 | 2020-03-05 | 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、平版印刷方法、及び、硬化性組成物 |
CN112638657A (zh) * | 2018-08-31 | 2021-04-09 | 富士胶片株式会社 | 平版印刷版原版、平版印刷版的制作方法、平版印刷方法及固化性组合物 |
JPWO2020045586A1 (ja) * | 2018-08-31 | 2021-06-03 | 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、平版印刷方法、及び、硬化性組成物 |
JP7065979B2 (ja) | 2018-08-31 | 2022-05-12 | 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、平版印刷方法、及び、硬化性組成物 |
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US20180321586A1 (en) | 2018-11-08 |
JPWO2017018262A1 (ja) | 2018-01-25 |
EP3330096A1 (en) | 2018-06-06 |
EP3330096A4 (en) | 2018-07-18 |
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