WO2014157064A1 - フレキソ印刷版の製造方法 - Google Patents
フレキソ印刷版の製造方法 Download PDFInfo
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- WO2014157064A1 WO2014157064A1 PCT/JP2014/058034 JP2014058034W WO2014157064A1 WO 2014157064 A1 WO2014157064 A1 WO 2014157064A1 JP 2014058034 W JP2014058034 W JP 2014058034W WO 2014157064 A1 WO2014157064 A1 WO 2014157064A1
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- Prior art keywords
- printing plate
- flexographic printing
- modified silicone
- amino
- plate
- Prior art date
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Classifications
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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
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
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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
- G03F7/40—Treatment after imagewise removal, e.g. baking
- G03F7/405—Treatment with inorganic or organometallic reagents after imagewise removal
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
- G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
Definitions
- the present invention relates to a method for producing a flexographic printing plate that enables high-quality mass printing.
- a general photosensitive resin plate for flexographic printing is produced through exposure / development and post-exposure steps as described in Patent Documents 1 to 3, for example.
- the printing method using the photosensitive resin plate for flexographic printing is to supply ink to the convex surface of the uneven resin plate with an ink supply roll or the like, and then bring the printing plate into contact with the substrate to be printed. In this method, the ink on the surface is transferred to the substrate.
- the ink often adheres to the shoulder portion of the convex portion of the printing plate or the ink penetrates into the concave portion (hereinafter referred to as plate surface contamination) during printing for a long time. As a result, a portion that is not the original pattern may be printed, resulting in a decrease in print quality.
- flexographic printing has been applied to high-definition printing, and halftone printing with a high number of lines is actively performed in order to produce gradations of color and density.
- the interval between the halftone dots becomes smaller, the ink is more likely to be clogged between the halftone dots of the printing plate. If the ink accumulates above a certain level in the valleys of the printing plate, these transfer to the substrate and cause dot entanglement, resulting in a significant reduction in print quality.
- flexographic printing is one of the features that can be applied to various types of inks such as water-based ink, alcohol-based ink, solvent-based ink, and UV ink.
- inks such as water-based ink, alcohol-based ink, solvent-based ink, and UV ink.
- it is required to prevent the plate surface from being stained regardless of which ink is used.
- it is necessary to prevent plate surface contamination even when ink having high penetrating power to the plate material such as solvent ink and UV ink is used.
- Patent Document 4 describes a method in which a silicone oil, a silicone rubber, a silicone varnish, or a fluorine compound is attached to a printing plate containing a polyester resin as a main component by brushing or spraying. Although this method has a certain plate surface stain prevention effect, plate surface stain cannot be prevented by halftone printing with a high number of lines where the distance between dots is narrow.
- Patent Document 5 proposes a method in which a mixture of an aqueous emulsion of a silicone compound or a fluorine compound and an aqueous resin is applied to a printing plate made of an elastomer. In this method, since an unmodified silicone compound is used, the ability to prevent plate surface contamination is not sufficient.
- Patent Document 6 proposes a method in which a solution containing a modified silicone compound is brought into contact after the exposure process at the time of making a flexographic printing plate.
- the use of a modified silicone compound improves the ability to prevent plate surface contamination.
- plate surface stains occur and the sustainability is not sufficient.
- Patent Document 7 proposes a method of bringing a liquid containing an amino-modified silicone compound into contact with a flexographic printing plate containing a latex having a gelation degree of 50% by mass or more.
- this method it is expected that the anti-staining property of the printing plate will be improved by the interaction between the amino-modified silicone compound and the gelled latex and / or the interaction between the amino-modified silicone compound and the emulsifier. None of these are satisfactory, and are not sufficient for high-quality mass printing.
- Patent Document 8 proposes a method of containing an organosilicon compound in a flexographic printing plate.
- an ink repellent component is included in the resin composition, and an excellent sustaining effect is exhibited as compared with the method in which the ink repellent component is brought into contact with the plate surface.
- the content of the organosilicon compound in the printing plate resin composition is as small as 0.05% by mass to 1.0% by mass, and there are few ink repellent components present on the printing plate surface. For this reason, it cannot be said that the plate surface stain prevention ability is sufficient.
- the present invention was devised in view of the current state of the prior art described above, and its purpose is to produce a flexographic printing plate that has plate surface antifouling ability and durability of its effect and enables high-quality mass printing. It is to provide a method.
- the present inventors have made contact with a treatment solution containing two kinds of amino-modified silicones having specific amine equivalents over the entire resin plate surface of the flexographic printing original plate. The inventors have found that the object can be achieved and have completed the present invention.
- a photosensitive resin layer comprising a photosensitive resin composition comprising at least a hydrophobic polymer comprising (A) a water-dispersed latex, (B) a photopolymerizable compound, and (C) a photopolymerization initiator.
- a production method for producing a flexographic printing plate from an original plate by steps including a main exposure step, a development step and a post-exposure step a primary amino-modified silicone having an amine equivalent of 1000 g / mol or less and an amine equivalent of 3000 g / mol or more
- a method for producing a flexographic printing plate comprising bringing a treatment solution containing the secondary amino-modified silicone, which is a mass ratio of 2.5: 1 to 1: 6, into contact with the entire surface of the flexographic printing plate.
- the method for producing a printing plate of the present invention treats a resin plate surface with a treatment solution containing two specific types of amino-modified silicones, the printing plate is provided with excellent plate surface antifouling ability and its sustaining effect. Can do.
- plate surface contamination does not occur for a long time, and stable high-quality mass printing can be performed.
- the production method of the present invention comprises (A) a hydrophobic polymer comprising a water-dispersed latex, (B) a photopolymerizable compound, and (C) a photosensitive resin layer comprising a photosensitive resin composition containing at least a photopolymerization initiator.
- a flexographic printing plate is manufactured from the provided flexographic printing original plate by a process including a main exposure process, a development process, and a post-exposure process.
- the photosensitive resin composition of the present invention contains (A) a hydrophobic polymer comprising an aqueous dispersion latex, (B) a photopolymerizable compound, and (C) a photopolymerization initiator as essential components.
- the component (A) (hydrophobic polymer composed of water-dispersed latex) can be used in one or more types, and in particular, two or more types are preferably used for high-quality printing excellent in fine image reproducibility.
- two or more types of latex are used, the water developability of the unexposed area of the printing original plate and the water resistance of the exposed area can be compatible, and a high-quality printing flexographic printing original plate excellent in fine image reproducibility can be produced.
- the component (A) may be appropriately selected from conventionally known latexes such as polybutadiene latex, styrene-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex, and methyl methacrylate-butadiene copolymer latex. Can be used. Further, these latexes may be modified with (meth) acryl, carboxy, silicone, fluorine or the like as desired. In addition, since many various synthetic latex and natural latex are marketed, an appropriate thing should just be selected from there.
- conventionally known latexes such as polybutadiene latex, styrene-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex, and methyl methacrylate-butadiene copolymer latex. Can be used. Further, these latexes may be modified with (meth) acryl, carboxy, silicone, fluorine or the like as desired. In
- a hydrophobic polymer composed of an aqueous dispersion latex containing a butadiene skeleton in the molecular chain is preferably used from the viewpoint of hardness and rubber elasticity.
- polybutadiene latex and acrylonitrile-butadiene copolymer latex are preferable.
- the blending amount of the component (A) in the resin composition is preferably 40 to 80% by mass. If it is less than 40% by mass, the strength as a printing plate is insufficient, and if it exceeds 80% by mass, it takes time for water development, which is not preferable.
- Component (B) (photopolymerizable compound) is for polymerizing / crosslinking by light irradiation to form a dense network for maintaining the shape on the printing plate, and preferably contains a photopolymerizable oligomer.
- the photopolymerizable oligomer is a polymer in which an ethylenically unsaturated group is bonded to the terminal and / or side chain of a conjugated diene polymer, and preferably has a number average molecular weight of 1000 or more and 10,000 or less. .
- the conjugated diene polymer is composed of a homopolymer of a conjugated diene unsaturated compound or a copolymer of a conjugated diene unsaturated compound and a monoethylenically unsaturated compound.
- Such copolymers include butadiene polymers, isoprene polymers, chloroprene polymers, styrene-chloroprene copolymers, acrylonitrile-butadiene copolymers, acrylonitrile-isoprene copolymers, methyl methacrylate-isoprene copolymers, acrylonitrile.
- -Isoprene copolymer methyl methacrylate-isoprene copolymer, methyl methacrylate-chloroprene copolymer, methyl acrylate-butadiene copolymer, methyl acrylate-isoprene copolymer, methyl acrylate-chloroprene copolymer Acrylonitrile-butadiene-styrene copolymer, acrylonitrile-chloroprene-styrene copolymer, and the like.
- butadiene polymers, isoprene polymers, and acrylonitrile-butadiene copolymers are preferred from the viewpoint of rubber elasticity and photocurability, and butadiene polymers and isoprene polymers are particularly preferred.
- the photopolymerizable compound may use a photopolymerizable monomer such as meta (a) acrylate, which is generally used, as long as it does not inhibit the effects of the present invention. Can do.
- the blending amount of the component (B) in the resin composition is preferably 10 to 45% by mass. If it is less than 10% by mass, the toughness is deteriorated, and if it exceeds 45% by mass, the developability may be deteriorated.
- the component (C) (photopolymerization initiator) is not particularly limited as long as it can polymerize a polymerizable carbon-carbon unsaturated group by light. Especially, what has the function to produce
- the amount of component (C) in the resin composition is preferably 0.1 to 10% by mass. If it is less than 0.1% by mass, the starting efficiency is reduced and the image reproducibility is poor. If it exceeds 10% by mass, the sensitivity becomes high and it becomes difficult to control the exposure time.
- hydrophilic polymer can be added to the photosensitive resin composition.
- hydrophilic polymers include —COOH, —COOM (M is a monovalent, divalent or trivalent metal ion or a substituted or unsubstituted ammonium ion), —OH, —NH 2 , —SO 3 H, phosphoric acid. Those having a hydrophilic group such as an ester group are preferred.
- a polymer of (meth) acrylic acid or a salt thereof a copolymer of (meth) acrylic acid or a salt thereof and an alkyl (meth) acrylate, ( Copolymer of meth) acrylic acid or a salt thereof and styrene, copolymer of (meth) acrylic acid or a salt thereof and vinyl acetate, copolymer of (meth) acrylic acid or a salt thereof and acrylonitrile, polyvinyl alcohol , Carboxymethylcellulose, polyacrylamide, hydroxyethylcellulose, polyethylene oxide, polyethyleneimine,- Examples thereof include polyurethane having a COOM group, polyureaurethane having a —COOM group, polyamic acid having a —COOM group, and salts or derivatives thereof.
- the blending amount of the hydrophilic polymer in the resin composition is preferably 2 to 30% by mass. When the amount is less than 2% by mass, the developability deteriorates. When the amount exceeds 30% by mass, the water resistance of the relief may be deteriorated.
- a thermal polymerization inhibitor (stabilizer) can be added from the viewpoint of enhancing the thermal stability during kneading and enhancing the storage stability.
- the blending amount of the thermal polymerization inhibitor (stabilizer) in the resin composition is generally 0.001 to 5% by mass.
- the thermal polymerization inhibitor include phenols, hydroquinones, and catechols.
- a plasticizer for the purpose of improving various properties within a range not inhibiting the effects of the present invention.
- an ultraviolet absorber for the purpose of improving various properties within a range not inhibiting the effects of the present invention.
- a dye for the purpose of improving various properties within a range not inhibiting the effects of the present invention.
- a fluorine compound for the purpose of improving various properties within a range not inhibiting the effects of the present invention.
- Other components such as can be appropriately added.
- the photosensitive resin composition having the above composition becomes a photosensitive resin layer of a flexographic printing original plate by a conventionally known method. From the flexographic printing original plate provided with the photosensitive resin layer, a flexographic printing plate is produced by processes including a main exposure step, a development step, and a post-exposure step by a conventionally known method.
- Processes such as a main exposure process, a development process, and a post-exposure process can be performed under conventionally known conditions used in a normal printing plate manufacturing method.
- the exposure light source used in the main exposure step is not particularly limited as long as it has a wavelength of 300 nm to 500 nm, and examples thereof include a high pressure mercury lamp, an ultraviolet fluorescent lamp, a carbon arc lamp, and a xenon lamp.
- the exposure intensity at this time is not particularly limited, but is, for example, 3 to 70 mW / cm 2 .
- the exposure intensity at this time is a numerical value using a UV-35 filter in a UV illuminance meter MO-2 machine manufactured by Oak Manufacturing.
- the developing device used in the developing process examples include a batch type developing device and an inline type automatic developing device.
- the development method is a development method in which the unexposed area is dissolved or scraped off with a brush while the plate is immersed in the developer, and the unexposed area is dissolved or scraped with a brush while sprinkling the developer on the plate surface with a spray or the like.
- a developing method for dropping The developer is not limited to the following, but includes, for example, an aqueous developer containing one or more nonionic, anionic, cationic or amphoteric surfactants, preferably an aqueous developer containing an anionic surfactant. Developer. You may contain an antifoamer, an alkali agent, etc. from a developable point.
- the exposure light source used in the post-exposure process is not particularly limited as long as it has a wavelength of 300 nm to 500 nm, and examples thereof include a high pressure mercury lamp, an ultraviolet fluorescent lamp, a carbon arc lamp, and a xenon lamp.
- the exposure intensity at this time is not particularly limited, but is, for example, 3 to 70 mW / cm 2 .
- the exposure intensity at this time is a numerical value using a UV-35 filter in a UV illuminance meter MO-2 machine manufactured by Oak Manufacturing.
- the post-exposure is performed in order to polymerize and crosslink the unexposed portion washed out by the development process by light irradiation.
- the exposure light source used in the germicidal lamp process may be any light source having a wavelength of 300 nm or less, and a commercially available germicidal lamp or the like is used.
- the irradiation amount is carried out by selecting a condition that can appropriately obtain the effect.
- the germicidal lamp irradiation is performed to remove surface tackiness.
- a first amino-modified silicone having an amine equivalent of 1000 g / mol or less and a second amino-modified silicone having an amine equivalent of 3000 g / mol or more is brought into contact with the entire surface of the flexographic printing plate. Thereby, the plate surface stain prevention effect of the printing plate can be maintained.
- the reason why two kinds of amino-modified silicones having different amine equivalents are used in combination is as follows.
- Primary amino-modified silicones have excellent durability due to many amino groups (cation groups: chemisorbed segments), but are used alone due to the short chain length of silicone groups (low surface tension groups: ink repellent segments) Then, ink repellency is insufficient.
- the secondary amino-modified silicone is excellent in ink repellency due to the long chain length of the silicone group (low surface tension group: ink repellent segment), but it has only a small number of amino groups (cation group: chemisorbed segment). If used, the sustainability is insufficient. Therefore, by using both the primary amino-modified silicone and the secondary amino-modified silicone in appropriate proportions, both act in a complementary manner, and have excellent anti-staining effect with durability and ink repellency. Can have.
- the primary amino-modified silicone promotes chemical adsorption with the surface of the flexographic printing plate, and has an excellent sustained effect.
- the amine equivalent of the primary amino-modified silicone is 1000 g / mol or less, preferably 300 g / mol or more and 1000 g / mol or less, more preferably 320 g / mol or more and 900 g / mol or less.
- any of a side chain type, a both-end type, a single-end type, a side-chain both-end type, etc. can be used, but preferably both side ends are modified with an alkoxy group.
- Examples include amino-modified silicone. If a side chain type amino-modified silicone having both ends modified with alkoxy groups is used, the fixability of trimethylsiloxane to the surface of the flexographic printing plate can be further improved.
- the secondary amino-modified silicone is chemically adsorbed on the surface of the flexographic printing plate and has an excellent effect of imparting ink repellency to the flexographic printing plate.
- the amine equivalent of the secondary amino-modified silicone is 3000 g / mol or more, for example, 3000 g / mol or more and 10000 g / mol or less, more preferably 3000 g / mol or more and 9000 g / mol or less.
- any of a side chain type, a both-end type, a one-end type, a side-chain both-end type, and the like can be used, but preferably a side-chain type amino-modified silicone, more preferably both ends.
- a side chain type amino-modified silicone that is not modified with an alkoxy group has a methyl group, a phenyl group, or a hydrogen atom at both ends).
- the kinematic viscosity of the primary amino silicone and the secondary amino-modified silicone is not particularly limited, but is preferably 20 to 5000 mm 2 / s, more preferably 40 to 1000 mm 2 / s. If the kinematic viscosity is low, the ink repellency is insufficient, and if the kinematic viscosity is high, uneven coating tends to occur.
- amino-modified silicone for example, the following are commercially available.
- those having an amine equivalent of 1000 g / mol or less are classified as primary amino-modified silicones, and those having an amine equivalent of 3000 g / mol or more are classified as secondary amino-modified silicones. being classified.
- Examples of the primary amino-modified silicone include KF-857 (amine equivalent 830 g / mol), KF-393 (amine equivalent 350 g / mol), L-655 (amine equivalent 700 g / mol), L-656 (amine equivalent 800 g / mol).
- Secondary amino-modified silicones include KF-859 (amine equivalent 6000 g / mol), KF-869 (amine equivalent 3800 g / mol), KF-860 (amine equivalent 7600 g / mol), L-653 (amine equivalent 8300 g / mol). ), WR-1300 (amine equivalent 3300 g / mol), WR-301 (amine equivalent 3700 g / mol), WR-1100 (amine equivalent 7000 g / mol).
- amino-modified silicone is used by being dissolved in a solvent as a treatment solution.
- the solvent include water or alcohols (for example, methanol, ethanol, isopropyl alcohol, etc.) or a mixed solvent of water and alcohols.
- a solvent such as glycerin or alkyl glycol ether, an acidic compound such as formic acid or acetic acid to increase the dissolution stability of amino-modified silicone, Glycerin, a surfactant or the like can be used. It is also possible to use a silane coupling agent in combination.
- the mixing ratio of the primary amino-modified silicone and the secondary amino-modified silicone in the treatment solution is, for example, 0.05 parts by mass to 5.0 parts by mass, preferably 0.1-3. 0 parts by mass. If the blending ratio is small, the ink repellency is insufficient, and if the blending ratio is large, uneven coating tends to occur.
- the mass ratio of primary amino modified silicone to secondary amino modified silicone in the treatment solution is 2.5: 1 to 1: 6, more preferably 2: 1 to 1: 5, even more preferably 2: 1 to 1. : 4, most preferably 1.5: 1 to 1: 3.5. If it is less than 2.5: 1, the ink repellency is insufficient, and if it exceeds 1: 6, the sustainability may be insufficient.
- any conventionally known method can be adopted.
- the treatment solution is treated with an atomizer, sprayer, brush, or the like at an appropriate time after the exposure process.
- examples thereof include a method of coating the whole and a method of immersing a printing plate in a treatment solution.
- the coating amount is preferably 1 to 100 g / m 2 , more preferably 3 to 50 g / m 2 .
- drying and heat treatment After bringing the treatment solution into contact with the printing plate, it is preferable to perform drying and heat treatment at a temperature of 40 ° C. or higher, preferably 50 ° C. or higher and lower than 100 ° C.
- the drying time is preferably 5 minutes or more, more preferably 10 minutes or more.
- the step of bringing the printing plate into contact with the processing solution may be any step after the main exposure step, but is preferably after the development step and immediately before the post-exposure step. This is because the normal flexographic plate making process involves drying after development, and when the printing plate is brought into contact with the processing solution after development, drying of the developing solution and drying / heat treatment of the processing solution can be performed simultaneously. This is because the process can be simplified.
- the step of bringing the printing plate into contact with the treatment solution may be after the post-exposure and the germicidal lamp irradiation step.
- the treatment solution is brought into contact after the post-exposure and the germicidal lamp irradiation step, it is preferable to perform drying and heat treatment again at a temperature of 40 ° C. or higher, preferably 50 ° C. or higher and lower than 100 ° C.
- this heat treatment step it is possible to further strengthen the chemical adsorption of the amino-modified silicone compound on the printing plate.
- Example 1 Preparation of photosensitive resin composition 46 parts by mass of butadiene latex (Nipol LX111NF, non-volatile content 55%, manufactured by Nippon Zeon Co., Ltd.), acrylonitrile-butadiene latex (Nipol SX1503, non-volatile content 43%, manufactured by Nippon Zeon Co., Ltd.) 11 11 parts by mass of oligobutadiene acrylate (ABU-4S, manufactured by Kyoeisha Chemical Co., Ltd.) as a photopolymerizable compound, 4.5 parts by mass of lauryl methacrylate (Light Ester L, manufactured by Kyoeisha Chemical Co., Ltd.), trimethylol Propane triacrylate (Light Ester TMP, manufactured by Kyoeisha Chemical Co., Ltd.) 4.5 parts by mass, photopolymerization initiator (Irgacure 651) 0.6 parts by mass, other components include hydrophilic polymer (PFT-3, non-vola
- the optical density was measured with a black and white transmission densitometer DM-520 (Dainippon Screen Mfg. Co., Ltd.). 80% saponification polyvinyl acetate (KH20, manufactured by Nihon Gosei Co., Ltd.) and plasticizer (Sunflex SE270, manufactured by Sanyo Chemical Industries, aliphatic polyhydric alcohol polyether polyol, solid content concentration 85%) and NBR latex ( SX1503A, manufactured by Nippon Zeon Co., Ltd., solid content concentration 42%) was mixed at a mass ratio of 50/20/30 to obtain a protective layer coating solution.
- KH20 manufactured by Nihon Gosei Co., Ltd.
- plasticizer Sunflex SE270, manufactured by Sanyo Chemical Industries, aliphatic polyhydric alcohol polyether polyol, solid content concentration 85%
- NBR latex SX1503A, manufactured by Nippon Zeon Co., Ltd., solid content concentration 42
- a protective layer coating solution is applied with a bar coater so that the thickness of the dried coating film becomes 2.0 ⁇ m, and dried at 120 ° C. for 5 minutes to form a film laminate (II )
- the above photosensitive resin composition is placed on a PET film support (Toyobo Co., Ltd., E5000, thickness 125 ⁇ m) coated with a copolyester adhesive, and the film laminate (II) is stacked thereon. Combined. Lamination was performed at 100 ° C. using a heat press machine to obtain a flexographic printing original plate comprising a PET support, an adhesive layer, a photosensitive resin layer, a protective layer, an infrared ablation layer, and a protective film. The total thickness of the plate was 1.70 mm.
- Examples 2 to 14, Comparative Examples 1 to 5 A photosensitive resin composition, a flexographic printing plate, and a flexographic printing plate were prepared in the same manner as in Example 1 except that the composition of the amino-modified silicone in the treatment solution was changed as shown in Table 1.
- the printing plates of Examples 1 to 14 and Comparative Examples 1 to 5 were evaluated for coating unevenness, surface tension, plate surface contamination, and solid ink uniformity based on the following evaluation methods.
- the wet spread of the liquid was visually evaluated.
- the numerical value of the liquid mixture that the liquid repelled was defined as the surface tension. The lower the surface tension, the higher the ink repelling property and the higher the effect of preventing ink clogging during printing.
- the sample after printing 500 m, 1000 m, 1500 m, and 2000 m was evaluated.
- Plate surface contamination was evaluated using a flexographic printing machine FPR302 (manufactured by MK Corporation) and 800 LPI anilox.
- the ink was made using a solvent ink (trade name: Bright Flex (manufactured by DIC Corporation)).
- Coated paper (trade name: manufactured by Oji Paper Co., Ltd.) was used as the substrate.
- the printing speed was 50 m / min. Under the above conditions, 500 m printing was first performed and a print sample was collected. Subsequently, 500 m was printed, and a sample after printing a total of 1000 m was obtained. Further printing was performed to obtain a sample after printing a total of 1500 m.
- the plate surface stain was evaluated with a halftone dot of 200 LPI and 10,20%. “A” when there is no plate surface contamination, “B” when the plate surface contamination is only at the halftone dot end, “C” when plate surface contamination occurs near the halftone dot end, and plate surface contamination occurs over the entire halftone dot. In this case, “D” was set.
- Solid portion ink uniformity is determined by visual inspection for the presence or absence of uneven ink density in the solid portion. If not confirmed, ⁇ , if confirmed partially, ⁇ , confirmed on the entire surface. If it was, it was set as x. Evaluation was performed using 800 LPI anilox using a flexographic printing press FPR302 (manufactured by MK Corporation). As the ink, solvent ink (trade name: Bright Flex (manufactured by DIC Corporation)) was used. Coated paper (trade name: manufactured by Oji Paper Co., Ltd.) was used as the substrate. The printing speed was 50 m / min. The printing pressure was evaluated after printing 50 m under the condition of pressurizing 0.02 mm from the appropriate value for the purpose of accelerating printing durability evaluation. The printing plate was evaluated using a solid plate having a width of 5 cm and a length of 5 cm.
- Table 1 shows the evaluation results of Examples 1 to 14 and Comparative Examples 1 to 5.
- Example 1 although the combination of the primary amino-modified silicone and the secondary amino-modified silicone is different, the mass ratio of the primary amino-modified silicone to the secondary amino-modified silicone is a suitable 1: 3, so that the printing plate High initial ink repellency (low surface tension) and high durability. Therefore, the plate surface is not soiled.
- the mass ratio of the primary amino-modified silicone to the secondary amino-modified silicone is in the range of 1: 1 to 1: 2, but the mass ratio is equivalent to 1: 3.
- Example 13 the mass ratio of the primary amino-modified silicone to the secondary amino-modified silicone is 1: 4, and the sustainability is lower than in Examples 1-12.
- Example 14 since the mass ratio of the first amino-modified silicone to the second amino-modified silicone is 2: 1, the initial ink repellency is slightly insufficient, and the plate surface is stained from the beginning.
- Comparative Example 1 since the mass ratio of the primary amino-modified silicone to the secondary amino-modified silicone is 1: 7, the initial ink repellency is high (surface tension is low), but the durability is inferior to that of the Examples.
- Comparative Example 2 is a secondary amino-modified silicone alone, and its durability is inferior to that of Comparative Example 1. Since Comparative Examples 3 and 4 do not contain a secondary amino-modified silicone, the ink repellency is poor, and both plate stains occur from the initial printing stage.
- Comparative Example 5 since the mass ratio of the primary amino-modified silicone to the secondary amino-modified silicone is 3: 1, the ink repellency is low from the beginning (the surface tension is high).
- the production method of the present invention it is possible to provide a flexographic printing plate that does not cause plate surface contamination over a long period of time even in printing using a solvent-based ink and enables stable high-quality mass printing.
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Abstract
Description
(1)(A)水分散ラテックスからなる疎水性重合体、(B)光重合性化合物、(C)光重合開始剤を少なくとも含む感光性樹脂組成物からなる感光性樹脂層を設けたフレキソ印刷原版から、主露光工程、現像工程および後露光工程を含む工程によりフレキソ印刷版を製造する製造方法において、アミン当量が1000g/mol以下である第一アミノ変性シリコーンと、アミン当量が3000g/mol以上である第二アミノ変性シリコーンとを、2.5:1~1:6の質量比で含有する処理溶液をフレキソ印刷版の表面全体に接触させることを特徴とするフレキソ印刷版の製造方法。
(2)処理溶液の接触が、処理溶液の印刷版表面への塗布または処理溶液への印刷版の浸漬によって行なわれることを特徴とする(1)に記載のフレキソ印刷版の製造方法。
(3)処理溶液の接触が現像工程の後であって後露光工程の直前に行なわれることを特徴とする(1)または(2)に記載のフレキソ印刷版の製造方法。
感光性樹脂組成物の作成
ブタジエンラテックス(Nipol LX111NF、不揮発分55%、日本ゼオン(株)製)46質量部、アクリロニトリル-ブタジエンラテックス(Nipol SX1503、不揮発分43%、日本ゼオン(株)製)11質量部、光重合性化合物であるオリゴブタジエンアクリレート(ABU-4S、共栄社化学(株)製)11質量部、ラウリルメタクリレート(ライトエステルL、共栄社化学(株)製)4.5質量部、トリメチロールプロパントリアクリレート(ライトエステルTMP、共栄社化学(株)製)4.5質量部、光重合開始剤(イルガキュア651)0.6質量部、その他成分として、親水性重合体(PFT-3、不揮発分25%、共栄社化学(株)製)12質量部、ハイドロキノンモノメチルエーテル0.06質量部を容器中で混合し、ドープを作成した。ドープを加圧ニーダーに投入して、80℃でトルエンと水を減圧除去した。
カーボンブラック分散液(オリエント化学工業(株)製、AMBK-8)、共重合ポリアミド(PA223、東洋紡績(株)製)、プロピレングリコール、メタノールを45/5/5/45の質量割合で混合し、赤外アブレーション層塗工液を得た。PETフィルム(東洋紡績(株)、E5000、厚さ100μm)の両面に離型処理を施した後、乾燥後の塗膜の厚みが1.6μmとなるようにバーコーターで赤外アブレーション層塗工液を塗工し、120℃×5分乾燥してフィルム積層体(I)を得た。光学濃度は2.3であった。光学濃度は白黒透過濃度計DM-520(大日本スクリーン製造(株))によって測定した。鹸化度80%ポリ酢酸ビニル(KH20、日本合成(株)製)と可塑剤(サンフレックスSE270、三洋化成工業製、脂肪族多価アルコール系ポリエーテルポリオール、固形分濃度85%)とNBRラテックス(SX1503A、日本ゼオン(株)製、固形分濃度42%)を、50/20/30の質量割合で混合し、保護層塗工液を得た。フィルム積層体(I)上に、乾燥後の塗膜の厚みが2.0μmとなるようにバーコーターで保護層塗工液を塗工し、120℃×5分乾燥してフィルム積層体(II)を得た。共重合ポリエステル系接着剤を塗工したPETフィルム支持体(東洋紡績(株)、E5000、厚さ125μm)上に上記感光性樹脂組成物を配置し、その上からフィルム積層体(II)を重ね合わせた。ヒートプレス機を用いて100℃でラミネートし、PET支持体、接着層、感光性樹脂層、保護層、赤外アブレーション層および保護フィルムからなるフレキソ印刷原版を得た。版の総厚は1.70mmであった。
印刷原版のPET支持体側から化学線(光源Philips10R、365nmにおける照度8mW/cm2)を1分間照射した。続いて、保護フィルムを剥離した。この版を、Esko CDI SPARK2530に巻き付け、画像形成を行った。アブレーション後、版を取り出し平面に戻し、化学線(光源Philips10R、365nmにおける照度8mW/cm2)を7分照射した。その後、A&V(株)製現像機(Stuck System、1%洗濯石鹸水溶液、40℃)で8分現像し、版面の水滴を水きり棒で除去した。KF-857(アミン当量830g/mol、信越化学工業製)/KF-859(アミン当量6,000g/mol、信越化学工業製)/イソプロピルアルコール=0.1/0.3/100(質量比)となるよう処理溶液を作製し、霧吹きを用いて処理溶液を版面の全面に行き渡るように吹き付けた。塗布量は、10g/m2であった。その後、60℃の乾燥機で10分乾燥し、化学線を10分間照射し、最後に表面粘着性を除去するために殺菌灯を5分間照射した。
処理溶液におけるアミノ変性シリコーンの組成を表1に記載のように変更した以外は、実施例1と同様にして感光性樹脂組成物、フレキソ印刷原版、フレキソ印刷版を作成した。
塗布ムラは、製版後の印刷版を用い、ベタ部の塗布ムラを目視で評価した。塗布ムラが一見して確認しがたい場合“○”、塗布ムラが一見して容易に確認できる場合“△”、粘調性の塗布ムラが明らかに見える場合“×”とした。
表面張力は、ぬれ張力試験用混合液(関東化学株式会社製)を用いて評価を行った。20℃、60RH%の雰囲気下で、22.6mN/m、25.4mN/m、27.3mN/m、30mN/m,31mN/m,32mN/m、33mN/m、34mN/m、35mN/m、36mN/m、37mN/m,38mN/m,39mN/m、40mN/mの各ぬれ張力試験用混合液を印刷版上に2滴たらし、綿棒で塗り広げた後30秒後の時の液の濡れ広がり方を目視で評価した。液がはじいた混合液の数値を表面張力とした。表面張力が低いほど、インクをはじく性質が高く、印刷時のインク詰りを防ぐ効果が高い。なお、500m、1000m、1500m、2000m印刷後の試料を評価した。
版面汚れは、フレキソ印刷機FPR302(エム・シーケー社製)を用い、800LPIのアニロックスを用いて評価した。インキは、溶剤インキ(商品名:ブライトフレックス(DIC株式会社製))を用いて行った。被印刷体にはコート紙(商品名:パールコート 王子製紙製)を用いた。印刷速度は50m/分で行った。上記条件で、まず500m印刷を行い、印刷試料を採取した。引き続き500m印刷を行い、合計1000m印刷した後の試料を得た。さらに印刷を行い、合計1500m印刷した後の試料を得た。最後にさらに印刷を行い、合計2000m印刷した後の試料を得た。評価する網点は、200LPIで10,20%の網点で版面汚れを評価した。版面汚れが皆無の場合“A”、版面汚れが網点最端部のみできた場合“B”、版面汚れが網点端部付近で発生した場合“C”、版面汚れが網点全面に発生した場合“D”とした。
ベタ部インキ均一性は、ベタ部のインキ濃度ムラの有無を目視で判定し、確認されなければ○、一部に確認した場合は△、全面に確認されれば×とした。
評価は、耐フレキソ印刷機FPR302(エム・シーケー社製)を用い、800LPIのアニロックスを用いて行なった。インキは、溶剤インキ(商品名:ブライトフレックス(DIC株式会社製))を用いた。被印刷体は、コート紙(商品名:パールコート 王子製紙製)を用いた。印刷速度は50m/分で行った。印圧は、耐刷評価を加速させる目的で適性値より0.02mm加圧した条件で50m印刷後に評価した。印刷版としては、幅が5センチメートルで長さが5センチメートルのベタ部を設けたものを用いて、評価した。
Claims (3)
- (A)水分散ラテックスからなる疎水性重合体、(B)光重合性化合物、(C)光重合開始剤を少なくとも含む感光性樹脂組成物からなる感光性樹脂層を設けたフレキソ印刷原版から、主露光工程、現像工程および後露光工程を含む工程によりフレキソ印刷版を製造する製造方法において、アミン当量が1000g/mol以下である第一アミノ変性シリコーンと、アミン当量が3000g/mol以上である第二アミノ変性シリコーンとを、2.5:1~1:6の質量比で含有する処理溶液をフレキソ印刷版の表面全体に接触させることを特徴とするフレキソ印刷版の製造方法。
- 処理溶液の接触が、処理溶液の印刷版表面への塗布または処理溶液への印刷版の浸漬によって行なわれることを特徴とする請求項1に記載のフレキソ印刷版の製造方法。
- 処理溶液の接触が現像工程の後であって後露光工程の直前に行なわれることを特徴とする請求項1または2に記載のフレキソ印刷版の製造方法。
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US14/762,022 US9358771B2 (en) | 2013-03-28 | 2014-03-24 | Method for producing flexographic printing plate |
ES14775753.8T ES2672001T3 (es) | 2013-03-28 | 2014-03-24 | Método para producir una placa de impresión flexográfica |
PL14775753T PL2980647T3 (pl) | 2013-03-28 | 2014-03-24 | Sposób wytwarzania fleksograficznej płyty drukowej |
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WO2017169572A1 (ja) * | 2016-03-29 | 2017-10-05 | 東洋紡株式会社 | レタープレス輪転印刷用凸版印刷原版 |
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JPWO2016148018A1 (ja) * | 2015-03-17 | 2017-12-28 | 東レ株式会社 | 凸版印刷版の製造方法および凸版印刷版 |
JP2017138514A (ja) * | 2016-02-04 | 2017-08-10 | アーゼッド・エレクトロニック・マテリアルズ(ルクセンブルグ)ソシエテ・ア・レスポンサビリテ・リミテ | 表面処理用組成物およびそれを用いたレジストパターンの表面処理方法 |
JP7300395B2 (ja) * | 2017-12-25 | 2023-06-29 | 日華化学株式会社 | 撥水剤組成物、及び撥水性繊維製品の製造方法 |
WO2020105259A1 (ja) * | 2018-11-21 | 2020-05-28 | 東洋紡株式会社 | 水現像性フレキソ印刷原版 |
JP6631766B1 (ja) | 2018-11-21 | 2020-01-15 | 東洋紡株式会社 | 水現像性フレキソ印刷原版 |
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ES2672001T3 (es) | 2018-06-12 |
EP2980647A1 (en) | 2016-02-03 |
JP5601606B1 (ja) | 2014-10-08 |
EP2980647B1 (en) | 2018-05-09 |
CN105008998B (zh) | 2019-11-26 |
EP2980647A4 (en) | 2016-08-03 |
US20150336371A1 (en) | 2015-11-26 |
TR201809750T4 (tr) | 2018-07-23 |
JPWO2014157064A1 (ja) | 2017-02-16 |
US9358771B2 (en) | 2016-06-07 |
PL2980647T3 (pl) | 2018-09-28 |
CN105008998A (zh) | 2015-10-28 |
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