Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
  • G03F7/004—Photosensitive materials
  • G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
  • G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
• • 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
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
  • G03F7/004—Photosensitive materials
  • G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors

Definitions

• the present invention relates to a photosensitive component for flexographic printing used for plate making of a flexographic printing plate, and a method for producing the same.
• a typical photosensitive composition for flexographic printing uses a polyester film as a support, and a photosensitive resin is laminated thereon.
• the method of plate making a photosensitive composition for flexographic printing is to expose the surface of the photosensitive resin through a transparent image carrier (negative film), perform image exposure (relief exposure), and then wash off the unexposed parts with a developing solvent.
• the procedure of forming a desired image, that is, a relief image, and obtaining a printing plate is employed.
• UV exposure is performed on the entire surface of the photosensitive resin through a support (back exposure), and a thin uniform cured layer is provided, followed by relief exposure through a negative film.
• the typical thickness of a flexographic printing plate is 0.5 to 10 mm, and an appropriate thickness is selected according to the settings of the printing medium and printing press.
• the flexographic printing plate or the photosensitive composition for flexographic printing may be used as a printing plate after a long period of time after being molded into a plate, so that the thickness of the plate may not change after molding. Not preferred.
• solid-state photosensitive components for flexographic printing may be stacked depending on the packaging form, so stability against plate deformation (cold flow) is required.
• the photosensitive composition for flexographic printing is cut into a size of 5 cm X 5 cm, and a total weight of 28 g Z cm is applied thereto. After mounting, the photosensitive composition for flexographic printing is required to have a thickness reduction rate of 2% or less.
• Flexographic printing differs in required quality depending on the purpose of printing and the substrate to be printed.
• beverage containers such as corrugated cardboard and milk cartons, which are required to protect the contents of printed materials, have large thicknesses.
• the thickness accuracy of the printing medium decreases, and the surface of the printing medium often has minute irregularities.
• the pressure generated between the printing plate and the printing medium causes unevenness. Due to the non-uniformity, a difference occurs in the ink transfer from the printing plate to the printing medium, and uneven printing may occur in the solid printing. Excessive pressure is often applied to the printing plate in normal flexographic printing to eliminate the unevenness.
• Printed patterns often consist only of solid areas.Since patterns often include blank characters, independent characters, halftones, and halftone dots in shadow areas, the Printing under the conditions of excessive printing pressure, which is regarded as important, has adverse effects on these. As a result, the quality required for printing plates is required to have a wide printing tolerance.
• printing on plastic bags is mainly used for line drawing printing, halftone printing and shadow printing, and the quality required for printing plates is the same as above. Become.
• the printing plate used for printing the line drawing J, the halftone, and the shadow is often thick, and especially in the case of printing on cardboard, the printing plate is often thick. In that case, the weight of the printing plate also increases.
• the weight of this printing plate is determined by mounting the plate on the printing press and holding the plate. Lightweight daggers are required for printing plates, as they can hinder work such as carrying.
• Patent Document 1 Japanese Patent Application Laid-Open No. Hei 7-31950. Proposed.
• one layer is made transparent and insoluble, and further, a cut is made in the unexposed portion to remove the unexposed portion, thereby reducing the weight. Since a new process such as cutting of unexposed parts and removal of unexposed parts had to be performed, there was a problem that plate making efficiency was reduced.
• Patent Document 2 Japanese Patent Application Laid-Open No. 61-182403 discloses that a photosensitive resin has a multilayer structure and one layer is made porous for the purpose of improving the printing quality of a printing plate.
• Patent Document 3 Japanese Patent Application Laid-Open No. 3-136501.
• bubbles are introduced by introducing and stirring a gas into the photosensitive resin.
• the plate thickness changes over time due to insufficient stability of the bubbles. There was a problem.
• Patent Document 4 Japanese Patent Application Laid-Open Nos. Hei 9-161 0 2 24
• Patent Document 6 Japanese Unexamined Patent Application Publication No. Hei 11-184 072
• Patent Document 7 WO 0Z39 64 0.
• the transfer of the low molecular weight substance from the photosensitive resin occurs, and a barrier layer for preventing the transfer is required, resulting in problems such as a complicated structure.
• Patent Document 8 Japanese Patent Application Laid-Open No. 2003-5101936. I have. Patent Document 8 describes that a pack exposure is performed in a plate making process. For that purpose, a layer having voids needs to be UV-permeable. The content of microspheres described here is between 1 and 10%. If the content of the microspheres is high, the UV transmittance of the layer containing the microspheres decreases, making it impossible to perform pack exposure.
• Patent Document 8 also aims at improving the print quality of four-color printing.
• Four-color process printing reproduces all colors contained in paintings, color photographs, etc. Normally, printing is performed in four colors: yellow, magenta, cyan, and black.
• this process printing it is necessary to express the entire range of color tones such as photographs, and in particular, highlight printing of halftone printing is required.
• minute dots In order to print the highlight area, it is necessary to form minute dots on the printing plate. In this case, it is necessary to perform pack exposure.
• the lack of back exposure may limit the number of halftone dots that can be used to form a photosensitive composition for flexographic printing.
• minute dots are not necessarily required.
• Patent Document 9 Japanese Patent Application Laid-Open No. 2000-155504
• Patent Document 10 Japanese Patent Application Laid-Open No. 200-26564
• the support is provided by bonding a support having an adhesive layer to a photosensitive resin such that the adhesive layer is in contact with the photosensitive resin.
• Patent Documents 4, 5, 6, 7, and 8 in which a urethane foam is provided below the photosensitive resin layer for the purpose of improving print quality, first, a urethane foam layer is formed. Since a manufacturing method of forming and then laminating a photosensitive resin is used, there is a problem that the number of steps is increased as compared with a method of manufacturing a photosensitive body for general flexographic printing.
• the technology of Patent Document 8 comprising a layer having voids due to expanded microspheres and a photosensitive resin layer also requires a step of forming a layer having a void layer and a step of forming a photosensitive resin.
• problems such as an increase in the number of manufacturing steps as compared with a normal photoconductor for flexographic printing.
• Patent Literature 1 Japanese Patent Application Laid-Open No. 7-31 9150
• Patent Document 2 JP-A-61-182020
• Patent Literature 3 Japanese Patent Application Laid-Open No. 3-1360051
• Patent Document 4 Japanese Patent Application Laid-Open No. 7-282822
• Patent Document 5 Japanese Patent Application Laid-Open No. Hei 9-161620
• Patent Document 6 JP-A-11-184804
• Patent Document 7 WO 0 0/3 9 6 4 0 bread fret
• Patent Literature 8 Special Table 2 0 0 3-5 1 9 0 3 6
• Patent Document 9 Japanese Patent Application Laid-Open No. 2000-15055 O
• Patent Document 10 Japanese Patent Application Laid-Open No. 2000-201
• the present invention when used as a printing plate, has excellent lightness, is easy to handle, and has a stable thickness of the structure over time. It is an object to provide a photosensitive composition for printing and a method for producing the same.
• an object of the present invention is to provide a photosensitive composition for flexographic printing suitable for line drawing printing, halftone printing, shadow printing, and more specifically for cardboard printing, printing for beverage containers and plastic bags.
• another object is to provide a method for easily obtaining a photosensitive composition for flexographic printing having good print quality without changing the conventional process.
• the support (A), the underlayer (B) and ⁇ ⁇ A photosensitive composition for flexographic printing comprising a photosensitive resin layer (C) laminated, wherein the underlayer (B) contains closed cells (a) having partition walls, and the closed cell component (a) is It has been found that the above problem can be solved by using the photosensitive composition for flexographic printing in an amount of 20 to 90% by weight based on the total weight of the underlayer (B). Reached.
• the present invention is as follows.
• a photosensitive composition for flexographic printing comprising a support (A), an underlayer (B) and a photosensitive resin layer (C) laminated, wherein the underlayer (B) is an independent member having a partition.
• the closed cell (a) the flexographic printing photosensitive structure is 20 to 90 wt 0/0, based on the total weight of the component underlying layer (B).
• the underlayer (B) contains at least one kind of binder (b), and the weight concentration of the binder (b) based on the total weight of the underlayer (B) is 10 to 60% by weight.
• the photosensitive composition for flexographic printing according to (1) is 10 to 60% by weight.
• the underlayer (B) comprises at least one kind of a binder (b), at least one kind of an ethylenically unsaturated compound ( c ), and at least one kind of a photopolymerizable initiator.
• the photosensitive composition for flexographic printing according to any one of (1) to (3), including (d).
• the photosensitive resin layer (C) contains at least an ethylenically unsaturated compound (f) and a photopolymerizable initiator (g), and forms the underlayer (B) and the photosensitive resin layer (C). Concentration of the ethylenically unsaturated compound, and Z or the underlayer (B) and the photosensitive resin layer
• the photosensitive composition for flexographic printing according to any one of (1) to (4), wherein the difference in the concentration of the photopolymerizable initiator of (C) is within 5%.
• the closed cells (a) of the underlayer (B) are made of polyvinylidene chloride,
• the photosensitive resin layer (C) a thermoplastic elastomer (e) composed of at least one kind of monovinyl-substituted aromatic hydrocarbon and a conjugated diene (e), at least one kind of an ethylenically unsaturated compound (f),
• the photosensitive composition for flexographic printing according to any one of (1) to (8), comprising a mixture of at least one of a photopolymerization initiator (g) and a photopolymerization initiator (g).
• a method for producing a photosensitive component for flexographic printing comprising laminating a support (A), an underlayer (B) and a photosensitive resin layer (C), wherein (i) thermal expansion A base layer (B) containing the component is laminated on the support (A), and (ii) a photosensitive resin layer (C) heated to a temperature at which the thermal expansion component expands, and the base layer (B).
• the substrate (A) is adhered to the base layer (B) so as to be in contact with the base layer (B), and (iii) the base layer (B) containing closed cells (a) having closed partition walls is formed by expansion of a thermal expansion component.
• the above method comprising:
• the underlayer (B) contains at least one kind of binder (b), and the weight concentration of the binder (b) based on the total weight of the underlayer (B) is 10 to 60 weight. 0/0 (1 3) the method according to any one of - (14).
• the underlayer (B) contains at least one kind of binder (b), at least one kind of ethylenically unsaturated compound (c), and at least one kind of photopolymerizable initiator (d). ) The method according to any one of (16) to (16).
• the photosensitive resin layer (C) contains at least an ethylenically unsaturated compound (f) and a photopolymerizable initiator (g), and the base layer (B) and the photosensitive resin layer (C) Ethylene unsaturated compound concentration, and Z or the underlayer (B) and the photosensitive resin layer
• the thermal expansion component contained in the underlayer (B) contains at least one partition selected from the group consisting of polyvinylidene chloride, polyarytalonitrile and polymethyl methacrylate (13 ) The method according to any one of (21) to (21).
• a support substrate for a photosensitive component for flexographic printing comprising a support (A) and a base layer (B) containing a thermal expansion component.
• the thermal expansion component contained in the underlayer (B) includes at least one partition selected from the group consisting of polyvinylidene chloride, polyacrylonitrile, and polymethyl methacrylate. 25) The support substrate according to any one of the above.
• the underlayer (B) containing a heat-expanding component on the support (A) contains at least one kind of binder (b), and the whole of the underlayer (B) of the binder (b)
• the present invention provides a flexographic printing plate which has excellent lightness, is easy to handle, has good stability of the thickness of the structure over time, and provides good printing when used as a printing plate.
• the photosensitive composition for use in the present invention has the following effects.
• the present invention has an effect of providing a photosensitive composition for flexographic printing suitable for line drawing printing, halftone printing, shadow printing, more specifically, step printing, printing for beverage containers and plastic bags.
• a method for easily obtaining a photosensitive composition for flexographic printing having good print quality without changing the conventional process can be obtained.
• a known support can be used, and for example, a polyester film, a polyamide sheet, a metal plate and the like can be used.
• a dimensionally stable polyester film with a thickness in the range of 75 to 300 im.
• examples of such a polyester film include all aromatic polyester films such as polyethylene terephthalate finolem, polybutylene terephthalate finolem, and polyethylene naphthalene film.
• Known photosensitive resin compositions can be used for the photosensitive resin layer (C) used in the present invention, and known liquid photosensitive resins, solvent-developed solid photosensitive resins, and water-developed photosensitive resins can be used.
• the solid type photosensitive resin is not particularly limited.
• liquid photosensitive resin composition known photosensitive resin compositions can be used.
• JP-A-52-90304, JP-A-1-245245, JP-A-3-157657, and JP-A-7-157 The liquid photosensitive resin described in each publication of 295218 can be mentioned.
• the photosensitive resin layer is preferably made of a solid-type photosensitive resin composition, and the photosensitive resin layer is formed of at least one kind of monovinyl-substituted aromatic hydrocarbon and a conjugated diene. More preferably, it comprises a mixture of a plastic elastomer (e), at least one ethylenically unsaturated compound (f), and at least one photopolymerization initiator (g).
• thermoplastic elastomer (e) used in the present invention a commonly used polymer of a monobutyl-substituted aromatic hydrocarbon and a conjugated diene monomer can be used.
• the monovinyl-substituted aromatic hydrocarbon monomer include styrene, polymethylstyrene, methyl styrene, and p-methoxystyrene.
• the conjugated diene monomer include butadiene and isoprene.
• Representative examples of (e) include a styrene-butadiene block copolymer and a styrene-isoprene copolymer.
• thermoplastic elastomer (e) having a molecular weight of preferably 5000 or more, more preferably 10,000 or more, and still more preferably 20000 or more is used, and the photosensitive resin (C ) Based on overall weight, Preferably 50% by weight or more, more preferably 50-85% by weight is used.
• esters of alcohol and acrylic acid such as t-butyl alcohol and lauryl alcohol
• maleimide derivatives such as laurylmaleide, silk mouth hexylmaleide and benzylmaleide
• esteranol fumanoleate of alcohols such as dioctinolefumarate
• other polyhydric alcohols and esters of atalinoleic acid or methacrylic acid alone or in combination Can be used in the composition of (C).
• the amount of the ethylenically unsaturated compound (f) is from 1 to 20% by weight in the photosensitive resin (C) based on the total weight of the photosensitive resin (C) in view of the reactivity of the photosensitive resin to ultraviolet rays. And more preferably 1 to 15% by weight.
• the molecular weight of the ethylenically unsaturated compound (f) is preferably less than 500, more preferably less than 300.
• photopolymerizable initiator (g) known radical polymerization initiators such as aromatic ketone dibenzoyl ethers can be used.
• aromatic ketone dibenzoyl ethers can be used.
• Photopolymerization initiator from the viewpoint of sensitivity to ultraviolet (g), based on the weight of the entire photosensitive resin (C), preferably from 0.1 to 1 0 weight 0 /. And more preferably 0.1 to 8% by weight.
• the photosensitive resin layer (C) can be prepared by various methods. For example, a thermoplastic elastomer ( e ), an ethylenically unsaturated compound (f), a photopolymerization initiator (g), and the like are dissolved in a suitable solvent, for example, chloroform, toluene, etc., and mixed. It can be obtained by casting it in and evaporating the solvent. Other The material can be kneaded with a roll or a roll, and can be adjusted to the desired thickness using an extruder, injection molding machine, press, etc.
• a suitable solvent for example, chloroform, toluene, etc.
• the bubbles of the underlayer (B) of the present invention include closed cells (a) having partition walls, and the components of the bubbles (a) having the partition walls are formed of the base layer (B). It needs to be 20-90% by weight based on the total weight.
• the bubble component having the partition walls From the viewpoint of the weight reduction effect and the strength of the underlayer, the bubble component having the partition walls
• the presence or absence of the partition walls of the bubbles in the underlayer (B) of the present invention can be confirmed by observing the cross section of the underlayer (B) under magnification using an electron microscope or the like. Furthermore, it can also be confirmed by dissolving the underlayer (B) in an appropriate solvent, for example, chloroform or toluene. In this method, when the bubbles of the underlayer (B) have partitions, the bubbles having the partitions float above the solution. On the other hand, in the case of the bubbles without the partitions, when the bubbles are dissolved in the solvent, the floating components are removed. There is no. By this method, bubbles with partition walls
• the weight% of the closed-cell component (a) having a partition can be determined by the following method. First, after measuring the weight of the underlayer (B), the underlayer (B) can be dissolved in an appropriate solvent (for example, chloroform, toluene, etc.), and can be dissolved in the closed cell (a) having the partition walls and the solvent. Components. Bubbles having partition walls (a) are insoluble in the solvent and can be separated. Bubbles having partition walls The component (a) is separated by a general method, for example, by a filtration method.
• an appropriate solvent for example, chloroform, toluene, etc.
• the weight is measured and compared with the weight of the base layer (B) dissolved in the solvent to obtain the closed-cell (a) components having the partition walls. % Based on the total weight of the base layer (B).
• the porosity of the underlayer (B) should be 70% or more from the viewpoint of weight reduction and printable width. Preferably, it is 70-99%, more preferably 75-99%.
• the porosity as referred to in the present invention means the volume% occupied by closed cells (a) having partition walls.
• the porosity can be determined from the expansion ratio of the underlayer (B) containing the closed cells (a).
• the porosity V (%) (1-1 / x) X when the base layer (B) expands X times the volume when the closed cell component is included, compared to when the closed cell component is not included. It is 100.
• the diameter of the closed cells is preferably 1 to 500 ⁇ , more preferably 1 to 300 ⁇ , and still more preferably 1 to 200 ⁇ .
• the thickness of the underlayer is preferably from 0.01 to 1 Omm, more preferably from 0.01 to 7 mm, from the influence on print quality.
• Bubbles in the underlayer (B) can be introduced by a known method. Bubbles having partition walls can be introduced by adding micro-voids having partition walls. As the minute hollow body having such a partition wall, generally known minute hollow spheres can be used. An example of such a micro hollow sphere is “Development technology for a functional filler”
• micro hollow body described in (CMC Co., Ltd.) can be used.
• fine hollow spheres such as alumina, zirconia, and carbon, which are mainly composed of silicon dioxide, and are mainly composed of inorganic substances not containing silicon dioxide, such as silas balun, perlite, gala sparun, silica balun, and silicon dioxide.
• fine hollow spheres composed of a phenol resin having an organic component as a main component, a copolymer of vinylidene chloride and atarilononitrile, and the like can be given.
• micro hollow spheres whose partition walls are made of a thermoplastic elastomer are preferred from the viewpoint of lightweight printing quality and the like.
• the partition walls of the closed cell component (a) preferably comprise a thermoplastic elastomer.
• the thermoplastic 1 "raw elastomer include a yarn composition containing at least one of polyvinylidene chloride, polyatarilonitrile, and polymethyl methacrylate.
• thermoplastic elastomer As a method of introducing bubbles having the thermoplastic elastomer as a partition into the underlayer, there are a method using thermally expandable microspheres and a method using already expanded microspheres.
• the heat-expandable microspheres increase in volume when heated, and form microspheres capable of generating closed cells, as described in Japanese Patent Application Laid-Open No. 2000-244488. It can be created in any way known.
• Thermally expandable microspheres are microspheres having a volatile organic liquid inside the microspheres. Examples of commonly used volatile organic liquids include hydrocarbons such as butane, isobutane, butene, isopten, pentane, isopentane, pentane, hexane, and heptene.
• the heat-expandable microspheres used in the present invention are commercially available, and they can be used in the present invention.
• “Matsumoto Microsphere Series” (trademark) by Matsumoto Yuyu Saiyaku Co., Ltd.
• “Expancel Series” trademark) by Nippon Philite Co., Ltd.
• partition walls of the heat-expandable microspheres used in the present invention may be coated with an inorganic powder or the like.
• the inorganic powder for example, calcium carbonate or titanium oxide can be fisted.
• the underlayer (B) is prepared by adding the above-mentioned micro hollow body having the partition walls to a mixture of the binder (b), the ethylenically unsaturated compound (c) and the photopolymerization initiator (d). Is preferred.
• binder (b) Known polymer compounds can be used as the binder (b). It is almost universally defined as a polymer compound. For example, as described in the Chemical Dictionary, published by Kyoritsu Shuppan Co., Ltd. Is more than
• binder (b) that can be specifically used, a commonly used binder such as a synthetic rubber or a thermoplastic elastomer can be used.
• the binder include natural rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, polybutadiene rubber, polyisoprene rubber, and ethylene propylene rubber.
• thermoplastic elastomer a polymer of a monobutyl-substituted aromatic hydrocarbon and a conjugated diene monomer as described above from the viewpoint of the influence of O on print quality is preferable.
• the monovinyl-substituted aromatic hydrocarbon monomer examples include styrene, ⁇ -methylstyrene, ⁇ -methylstyrene, ⁇ -methoxystyrene and the like. Butadiene, isoprene and the like are used as monomer. Typical examples of the thermoplastic elastomer include styrene-butadiene block copolymer, styrene-isoprene block copolymer, and the like.
• the binder (b) component is preferably 10 to 60% by weight, more preferably 15 to 60%, based on the total weight of the underlayer (B). More preferably, it is 20 to 60%.
• polymers such as polyester, polyurethane, and epoxy resin can be used as the binder.
• binder use a binder that has good adhesion to both the support (A), both layers of the photosensitive resin ([C]), or one of the layers.
• the base layer (B) and the support (A) It is preferable because an adhesive force can be obtained between both layers of the photosensitive resin layer (C) or one of the layers.
• esters of alcohol and acrylic acid such as t-butyl alcohol 7-peraduryl alcohol
• maleimide derivatives such as lauryl maleimide, cyc hexinole maleimide, and benzino remalide
• dioctinoref Polycondensation of alcoholic olenoles such as malate, such as estenolate, hexanediene-nore (meta) atelylate, nonaneji-nore (meta) atalylate, trimethylol (meth) atalylate, etc.
• esters of alcohol and acrylic acid such as t-butyl alcohol 7-peraduryl alcohol
• maleimide derivatives such as lauryl maleimide, cyc hexinole maleimide
• benzino remalide dioctinoref Polycondensation of alcoholic olenoles such as malate, such as estenolate, hexane
• the ethylenically unsaturated compound (c) used for the base layer (B) may be the same as or different from the utylene unsaturated compound (f) used for the photosensitive resin (C) layer laminated thereon. However, from the viewpoint of stability, it is preferable to use the same ethylenically unsaturated compound (f) for the underlayer (B).
• the weight concentration of the ethylenically unsaturated compound (c) contained in the underlayer (B) is determined by the weight of the photosensitive resin (C) based on the total weight of the photosensitive resin (C).
• the difference from the weight concentration of the ethylenically unsaturated compound (f) is preferably within 5%, more preferably within 4%, further preferably within 3%.
• a known photopolymerization initiator (g) used for the photosensitive resin (C) can be used.
• known radical polymerization initiators such as the aforementioned aromatic ketones and benzoyl ethers can be used.
• benzophenone Michler's ketone, benzoinmethineoleatenore, benzoineetinoleatenole, benzoinisopropinoleatenole, —methylonelebenzine methinoleatenole, methoxybenzoinmethineoleatene, 2,2-— It can be selected from dimethoxyphenylacetophenone and the like, and can be used in combination.
• the photopolymerization initiator (d) used for the underlayer (B) may be the same as or different from the photopolymerization initiator (g) used for the photosensitive resin (C) layer to be laminated. From the viewpoint of stability, it is preferable to use the same photopolymerization initiator (g) for the underlayer (B).
• the weight concentration of the photopolymerization initiator (d) contained in the undercoat layer (B) is determined based on the total weight of the photosensitive resin (C).
• the difference from the weight concentration of the photopolymerization initiator (g) is preferably within 5%, more preferably within 4%, further preferably within 3%.
• the ethylenically unsaturated compound (c) and the photopolymerization initiator (d) contained in the underlayer (B) may be directly added to the underlayer (B) or may be added to the undercoat layer (C).
• the migration may cause the underlayer (B) to contain the ethylenically unsaturated compound [c] or the photopolymerization initiator (d).
• the ethylenically unsaturated compound (c) or photopolymerization initiator (d) should be added to the underlayer (B) in advance. Enclosure is preferred.
• the concentration of each component in these resins can be quantified using a known analysis technique such as NMR or gas chromatography.
• a composition generally used for a photosensitive resin composition can be added, and a plasticizer, a thermal polymerization inhibitor, a colorant, an ultraviolet absorbing agent IJ, a tackifier, Dyes and pigments can be added.
• the support (A), the underlayer (B) and the photosensitive resin layer (C) are laminated.
• the photosensitive composition for flexographic printing is composed of (i) an underlayer containing a S Peng Zhang component caused by heat.
• (B) is laminated on the support (A), and (ii) the photosensitive resin layer (C) heated to a temperature at which the heat-expandable component expands, and the support having the lower: tfe layer (B) ( A) is bonded to the base layer (B) so as to be in contact with the base layer (B), and (iii) a base layer (B) containing closed cells (a) having closed partition walls is created by expansion of a thermal expansion component. create.
• the expansion component is expanded in the underlayer (B) by utilizing the heat of the photosensitive resin layer (C) heated as described above. That is, the photosensitive resin kneaded by the kneader-extruder is usually in a heated state, and the photosensitive resin is also heated during press molding. By bonding the underlayer (B) to the heated photosensitive resin (C), thermal energy is applied to the underlayer, and the heat causes the expansion component in the underlayer to expand. This produces a photosensitive component for flexographic printing.
• the base layer (B) having a thermal expansion component expands 1.1 to 100 times when bonded to the photosensitive resin layer (C) heated to a temperature at which the thermal expansion component expands. It preferably expands 1.1 to 50 times, more preferably 2 to 50 times.
• the photosensitive resin layer (C) is preferably heated to 60 to 250 ° C, more preferably from the viewpoint of expanding the expansion component due to heat contained in the underlayer (B).
• the temperature is raised to 80 to 250 ° C, more preferably 100 to 250 ° C.
• the heat-expanding component is preferably a heat-expandable force plate having a partition wall from the viewpoint of the properties of the ink and the stability of bubbles.
• the thermal expansion force capsule is a microcapsule having a volatile organic liquid in the content of the force capsule, and it is preferable that the partition walls be made of a thermoplastic elastomer from the viewpoint of light weight and printing quality.
• the thermoplastic elastomer which is the partition wall include [polyvinylidene chloride, polyatarylonitrile, and polymethyl methacrylate, or a composition thereof.
• the volatile organic liquid include hydrocarbons such as butane, isobutane, butene, isobutene, pentane, isopentane, neopentane, hexane, and heptene.
• the swelling start temperature and the optimum expansion temperature of the heat-expandable capsule are adjusted according to the conditions for manufacturing the photosensitive component for flexographic printing. It is preferable to select.
• the expansion start temperature is preferably 50 ° C to 150 ° C, more preferably 60 ° C to 150 ° C, and even more preferably 70 ° C to 15 ° C. 0 ° C.
• the optimum expansion temperature is 80 to 200 ° C., preferably 90 to 200 ° C., and more preferably 100 to 200 ° C.
• the optimum expansion temperature indicates the temperature at which the volume of the thermally expandable capsule expands in the shortest time.
• the amount of expansion components due to heat in the base layer (B) is based on the total weight of the base layer (B), a 2 0-9 0 weight 0/0 .
• the base layer (B) having a thermal expansion component preferably contains a binder (b) in addition to the thermal expansion component. Further, the weight concentration of the binder (b) based on the total weight of the underlayer (B) is preferably from 10 to 60% by weight.
• the binder contained in the base layer (B) having a thermal expansion component that is, in the base layer (B) before the thermal expansion component expands in the present manufacturing method
• the binder generally used described above may be used. it can.
• binder (b) that can be used include generally used binders such as synthetic rubbers and thermoplastic elastomers.
• the binder include natural rubber, styrene butadiene rubber, acrylonitrile, tagem gum, polybutadiene rubber, polyisoprene rubber, ethylene propylene rubber and the like.
• the thermoplastic elastomer the above-mentioned polymer of a monovinyl-substituted aromatic hydrocarbon and a conjugated gen monomer is preferable because of its influence on print quality.
• the monobutyl-substituted aromatic hydrocarbon monomer includes styrene, monomethylstyrene, p-methylstyrene, p-methoxystyrene, and the like, and the conjugated diene monomer includes butadiene and isoprene.
• Representative examples include a styrene-butadiene block copolymer and a styrene-isoprene block copolymer.
• the binder (b) component is preferably 10 to 60% by weight, more preferably 15 to 60%, based on the total weight of the underlayer (B). And more preferably 20 to 60%.
• polymers such as polyester, polyurethane, and epoxy resin can be used as the binder.
• binder it is preferable to use a binder having good adhesion to both layers of the support (A) and the photosensitive resin (C), or to one of the base layer (B) and the support.
• the underlayer (B) containing the thermal expansion component that is, the underlayer (B) before the expansion of the thermal expansion component, contains at least one type of ethylenically unsaturated compound (c) and at least one type of photopolymerization. It is preferable to include the initiation sequence [j (d)].
• ethylenically unsaturated compound (c) known ethylenically unsaturated compounds used for the above-mentioned photosensitive resin can be used.
• esters of alcohol and acrylic acid such as t-butyl alcohol diaryl alcohol, lauryl maleide, maleic derivatives such as cyclohexyl maleimide and benzyl maleimide, dioctyl fumarate, etc.
• Esters of polyhydric alcohols such as acrylate, trimethylol (meth) acrylate and the like with atalinoleic acid or methacrylic acid can be used alone or in combination in the photosensitive resin composition.
• the ethylenically unsaturated compound (b) used for the base layer (B) before expansion of the thermal expansion component is the same as the ethylenically unsaturated compound (f) used for the photosensitive resin (C) layer to be laminated. It may be different or different, but from the viewpoint of stability, it is preferable to use the same ethylenically unsaturated compound (f) for the underlayer (B)! / ,.
• the weight concentration of the ethylenically unsaturated compound (c) contained in the base layer (B) before expansion R is photosensitive! ⁇
• the difference from the weight concentration of the ethylenically unsaturated compound (f) in the photosensitive tree (C) based on the total weight of the resin (C) is preferably within 5%, more preferably within 4%, It is preferably within 3%.
• the photopolymerization initiation mass (J (d)) contained in the underlayer (B) before expansion of the thermal expansion component is defined as
• a known photopolymerization initiator (g) used for the photosensitive resin (C) can be used.
• known radical polymerization initiators such as the aromatic ketones and benzoyl ethers described above can be used.
• the photopolymerization initiator (d) used for the base layer (B) before expansion of the thermal expansion component is the same as the photopolymerization initiator (g) used for the photosensitive resin (C) layer to be laminated.
• the same photopolymerization initiator (g) is preferably used for the underlayer (B) from the viewpoint of stability, though it may be different.
• Base layer before expansion based on the total weight of base layer (B) before expansion of thermal expansion component
• the weight concentration of the photopolymerized U (d) contained in (B) is different from the weight concentration of the photopolymerization initiator (g) in the photosensitive resin (C) based on the total weight of the photosensitive resin (C). Is preferably within 5%, more preferably within 4%, and still more preferably within 3%.
• a composition generally used for a photosensitive resin composition can be added to the underlayer (B) before expansion of the expansion component due to heat used in the production method of the present invention. Agents, coloring agents, ultraviolet absorbers, tackifiers, dyes, pigments, and the like.
• t-layer (B) that is, the underlying layer (B) before expansion of the thermal expansion component, is extruded or? It can be placed on the support by coating with a solvent, etc., but from the viewpoint of productivity; it can be provided by dissolving in a suitable solvent, for example, toluene, and then coating. preferable.
• the thickness of the underlayer (B) provided on the support and containing a thermal expansion component is preferably 0.001 to lmm from the viewpoint of production stability and the like.
• the support base material of the present invention is obtained by laminating a base layer (B) containing a heat-expanding component on a support (A).
• the underlayer (B) containing the above-mentioned heat-expandable component can be provided on the support (A) by the above-described method.
• the amount of the thermal expansion component is preferably 1 to 90% by weight, more preferably 20 to 90% by weight, More preferably, it is 20 to 80% by weight, most preferably 30 to 80% by weight.
• a photosensitive resin for flexographic printing can be obtained by laminating a photosensitive resin on the support substrate for the photosensitive resin for flexographic printing of the present invention. Photosensitive resin, solvent-developing photosensitive resin, and water-developing photosensitive resin.
• An adhesive is provided on the side to produce a photosensitive composition for flexographic printing.
• a photosensitive composition for flexographic printing can be prepared by a method described in Japanese Patent Application Laid-Open No. 1-292652.
• the photosensitive resin layer may have adhesive properties depending on the type of the set, it is necessary to improve the contact with the transparent image carrier that is overlaid on the photosensitive resin layer during plate making, or to reuse the transparent image carrier.
• a thin flexible protective film soluble in the developer can be provided.
• Japanese Patent Application Laid-Open No. 2002-26828 can mention a thin film of 3 ⁇ 4 ⁇ .
• a flexographic printing plate can be obtained by subjecting the above-mentioned photosensitive composition for flexographic printing plate U to plate making processing by a usual method.
• Ultraviolet light exposure sources for photo-curing photosensitive resin used in plate making include high-pressure mercury lamps, ultraviolet fluorescent lamps, carbon arc lamps, and xenon lamps.
• the desired image can be obtained by exposing the photosensitive resin to ultraviolet light through a transparent image carrier.
• the entire surface is exposed from the support side. It is effective to do.
• Either the exposure from the transparent image carrier side or the exposure from the support side may be performed first, or may be performed simultaneously. Support from the viewpoint of image reproducibility It is preferable to perform the exposure from the side first.
• Developing solvent used to wash and remove unexposed areas includes, for example, chlorinated solvents such as 1,1,1-trichloroethane and tetrachloroethylene, and heptyl acetate and 3-methoxybutyl acetate. Examples include esters, petroleum fractions, hydrocarbons such as toluene and decalin, and mixtures of these with alcohols such as pro / nol and butanol.
• Unexposed parts are washed out by spraying from a nozzle or by brushing with a brush. The obtained printing plate is rinsed, dried and post-exposed to obtain a printing plate.
• a laser-engravable layer is formed by irradiating the entire surface of the photosensitive resin layer with ultraviolet rays, and then a pattern is formed by irradiating a laser beam and removing the resin at the portion irradiated with the beam. It is also possible to make printing plates for laser engraving.
• the flexographic stamp J obtained by the above-described method is preferably used for line drawing printing, halftone printing to halftone dot printing in the shadow region, and beverage containers such as cardboard and milk cartons, plastic bags, etc. It is preferably used for printing.
• the line drawing printing of the present invention is to print a line drawing, and the line drawing is an additional printing dictionary.
• halftone in halftone printing refers to the area between the highlight and shadow of the image, as described in the supplemental printing dictionary (edited by The Printing Society of Japan, published in 1987). As shown in the supplemental printing dictionary (edited by The Printing Society of Japan, published in 1987), shadows represent dark areas such as photographs and paintings.
• compositions described below are parts by weight.
• the composition shown in Table 1 as a photosensitive resin composition was kneaded with a kneader to obtain a photosensitive resin composition.
• the obtained photosensitive resin composition was sandwiched between a silicone-treated polyester film and a polyethylene terephthalate film having a polyamide film, and 1.96 minutes at 130 ° C for 4 minutes using a 3 mm spacer. was pressure forming with a pressure of X 1 0 7 P a. When the thickness of the obtained photosensitive resin layer was measured, it was 3.0 mm.
• this solution was applied using a knife coater on a 125 ⁇ m-thick polyethylene terephthalate film so that the coating thickness after drying would be 100 ⁇ m to form a support having an underlayer. did.
• the thickness of the underlayer on the underlayer was measured, it was 100 ⁇ m.
• the silicone-treated polyethylene terephthalate film was peeled from the photosensitive resin layer, and the photosensitive resin layer was placed on a heated stainless steel plate and heated to a resin temperature of 150 ° C. Next, the underlayer and the photosensitive resin were adhered so that the photosensitive resin surface and the underlayer surface were in contact with each other, to obtain a photosensitive component for flexographic printing. Observation of a cross section of this photosensitive composition for flexographic printing with an electron microscope showed the results shown in Table 2, where the thickness of the underlayer expanded to 110 tm. As a result of further observation, it was found that the underlayer had voids and the underlayer had bubbles.
• the porosity was determined from the expansion ratio, it was 91% as shown in Table 2.
• the underlying layer has the same stability as the photosensitive resin layer. Desirable plate thickness stability is, as described above, the base layer is cut into squares of 5 cm square,
• the obtained photosensitive composition for flexographic printing was passed through a transparent image carrier using an ultraviolet fluorescent lamp even with a center wavelength of 370 nm on “AF P-1500” (trade name, manufactured by Asahi Kasei Corporation). An image of Om jZcm 2 was exposed. At this time, the exposure intensity was measured with a UV illuminometer “MO-2” (trademark) manufactured by Oak Manufacturing Co., Ltd. using a UV-35 filter. Next, development was performed using an AFP-1500 developing machine (manufactured by Asahi Kasei Corporation) using tetrachloroethylene / n-butanol 3/1 (volume ratio) as a developing solution, dried at 60 ° C for 1 hour, and exposed to flexographic light. A printing plate was obtained. The obtained flexographic printing plate was installed on a printing press ( ⁇ When mounted, the flexographic printing plate was reduced in weight, so it was easy to attach the plate to the printing simulation, and the plate was suitable for movement. The handling was easy.
• the appropriate printing pressure condition is the minimum printing pressure condition under which the ink in the print area can be sufficiently printed. Printing at an appropriate printing pressure The printing results shown in Table 2 were obtained, and high quality printed matter was obtained.
• the highlights of 30% were magnified and observed with a light microscope, and when the printed dots were connected to the adjacent dots, the dots were judged as X, and the dots were crushed.
• the dots were judged as X, and the dots were crushed.
• a good printed material in which the dots were not crushed was obtained, and was rated as ⁇ .
• a photosensitive resin was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mm.
• this solution was applied using a knife coater on a polyethylene terephthalate film having a thickness of 125 ⁇ m so that the coating thickness after drying was 100 m, to prepare a support having an underlayer. .
• the thickness of the underlayer on the underlayer was measured, it was 100 / zm.
• the photosensitive resin layer and the support were bonded together in the same manner as in Example 1 to obtain a photosensitive structure for flexographic printing.
• Observation of a cross section of the photosensitive composition for flexographic printing with an electron microscope showed the results shown in Table 2, where the thickness of the underlayer expanded to 2000 jum. As a result of further observation, it was found that the underlayer had voids and the underlayer had bubbles.
• the obtained flexographic printing plate was mounted on a printing press.Since the flexographic printing plate was lighter, it was easier to mount the plate on the printing press and the plate was suitable for movement. Handling was as easy as in Example 1.
• a photosensitive resin was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mm.
• this solution was applied using a knife coater on a 125 ⁇ m-thick polyethylene terephthalate film so that the coating thickness after drying would be 100 ⁇ m to form a support having an underlayer. did.
• the thickness of the underlayer on the underlayer was measured, it was 100 ⁇ m.
• a photosensitive resin and a support were laminated in the same manner as in Example 1 except that the temperature of the photosensitive resin was changed to 170 ° C. to obtain a photosensitive composition for flexographic printing.
• Observation of a cross section of this photosensitive composition for flexographic printing with an electron microscope showed the results shown in Table 2, where the thickness of the underlayer expanded to 40 ⁇ . As a result of further observation, it was found that the underlayer had voids and the underlayer had bubbles.
• the resulting photosensitive composition for flexographic printing was subjected to a plate making process under the same conditions as in Example 1 to obtain a flexographic printing plate.
• the obtained flexographic printing plate was mounted on a printing press.Since the flexographic printing plate was lighter, it was easier to mount the plate on the printing press and the plate was suitable for movement. Handling was as easy as "Example 1".
• a photosensitive resin was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mm.
• a photosensitive resin and a support were bonded together in the same manner as in Example 1 to obtain a photosensitive composition for flexographic printing.
• Observation of the cross section of the photosensitive composition for flexographic printing with an electron microscope showed the results shown in Table 2, where the thickness of the underlayer was expanded to 2200 im. As a result of further observation, it was found that the underlayer had voids and the underlayer had bubbles.
• the resulting photosensitive composition for flexographic printing was subjected to a plate making process under the same conditions as in Example 1 to obtain flexographic printing.
• the obtained flexographic printing plate was mounted on a printing press.Since the flexographic printing plate was lighter, it was easier to mount the plate on the printing press and the plate was suitable for movement. Handling was as easy as in Example 1.
• a photosensitive resin was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mm.
• Styrene-butadiene copolymer manufactured by Asahi Kasei Co., Ltd., trade name “Taphrene 912” 3.6 parts, liquid polybutadiene (manufactured by Nippon Petrochemical, m “B_200 OJ) 1.4 parts, 1,9-nonanediol diatalylate 0 7 parts, 2,2-dimethoxy-phenylacetophenone 0.2 parts, 2,6-di-t-butyl-p-cresol, 0.1 part, and heat-expandable capsule (Matsumoto Yushi Pharmaceutical Co., Ltd. (Matsumoto Microsphere F-50D, trade name, optimal foaming temperature: 130-140 ° C, dry weight) was added to 20 parts of toluene to obtain a uniform solution.
• this solution was applied using a knife coater on a polyethylene terephthalate film having a thickness of 125 ⁇ m so that the coating thickness after drying was 100 ⁇ m, to prepare a support having an underlayer.
• a knife coater on a polyethylene terephthalate film having a thickness of 125 ⁇ m so that the coating thickness after drying was 100 ⁇ m, to prepare a support having an underlayer.
• the photosensitive resin and the support were bonded together in the same manner as in Example 1 to obtain a photosensitive composition for flexographic printing.
• Observation of the cross section of the photosensitive composition for flexographic printing with an electron microscope showed the results shown in Table 2, where the thickness of the underlayer expanded to 1100 ⁇ . As a result of further observation, it was found that the underlayer had voids and that the underlayer had bubbles.
• the support having the underlayer is simply stuck to the photosensitive resin. (Since this was an operation, it was easy to prepare a photosensitive composition for flexographic printing.
• the plate making process of the obtained photosensitive composition for flexographic printing was performed under the same conditions as in Example 1. Let's get flexographic printing.
• the obtained flexographic printing plate was mounted on a printing press.Since the flexographic printing plate was lighter, it was easier to mount the plate on the printing press and the plate was suitable for movement. Handling was as easy as in Example 1.
• a photosensitive resin was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mm.
• a photosensitive resin and a support were bonded together in the same manner as in Example 1 to obtain a photosensitive composition for flexographic printing.
• Observation of the cross section of this photosensitive composition for flexographic printing with an electron microscope showed the results shown in Table 2, where the thickness of the underlayer expanded to 110 / m. As a result of further observation, it was found that the underlayer had voids and the underlayer had bubbles.
• the resulting photosensitive composition for flexographic printing was subjected to a plate making process under the same conditions as in Example 1 to obtain a flexographic printing plate.
• the flexographic printing plate When the obtained flexographic printing plate was attached to a printing press, the flexographic printing plate was lightweight, so that the plate could be easily attached to the printing press, and the plate could be moved easily. The handling was as easy as in Example 1.
• Example 2 Further, a printing test was conducted using the obtained flexographic printing plate in the same manner as in Example 1, and the results shown in Table 2 were obtained. As shown in Table 2, good printed matter was obtained under both the conditions of an appropriate printing pressure and an excessive printing pressure.
• a photosensitive resin layer was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mmO.
• a polyethylene terephthalate film was adhered to the resulting photosensitive resin layer as a support to obtain a photosensitive composition for flexographic printing.
• the plate making process of the obtained photosensitive composition for flexographic printing was performed under the same conditions as in Example 1. I got flexographic printing.
• a photosensitive resin was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mm.
• Styrene-butadiene copolymer (Asahi Kasei Co., Ltd., trade name "Taphrene A”) 60 parts, liquid polybutadiene (Nippon Petrochemical Co., Ltd., trade name “B-20000”) 30 parts, 1,9-nonanediol dia 7 parts of acrylate, 2 parts of 2,2-dimethoxypheninoleacetophenone and 1 part of 2,6-di-tert-butyl-p-cresol were kneaded in the same manner as in Example 1 using a kneader. This composition was melted inside the extruder, and nitrogen gas was introduced to foam and extrude the polyethylene terephthalate film to obtain an underlayer having a thickness of 3 mm. At this time, the expansion ratio was 2 times.
• a photosensitive resin and a support were bonded together in the same manner as in Example 1 to obtain a photosensitive composition for flexographic printing.
• Observation of the cross section of the photosensitive composition for flexographic printing with an electron microscope showed the results in Table 2, and it was found that the bubbles in the underlayer did not have partition walls. Since there are two kneading steps, such as the step of molding the underlayer and the step of forming the photosensitive resin, the work efficiency is lower and the work burden is lower than when the kneading step is one step. Was.
• the resulting photosensitive composition for flexographic printing was subjected to a plate making process under the same conditions as in Example 1 to obtain a flexographic seal report IJ.
• a photosensitive resin was prepared in the same manner as in Example 1 to obtain a photosensitive resin layer having a thickness of 3 mm.
• the components of the underlayer in a molten state were flowed on a lmm-thick mold on a polyester film to prepare a support having a 1-mm-thick sheet-like underlayer.
• a photosensitive resin and a support were bonded together in the same manner as in Example 1 to obtain a photosensitive composition for flexographic printing.
• Observation of the cross section of the photosensitive composition for flexographic printing with an electron microscope gave the results shown in Table 2. As a result of further observation, it was found that the underlayer had voids and the underlayer had bubbles.
• the work efficiency is lower and the work is burdensome as compared with the case where the kneading step is one step.
• the porosity was determined from the expansion ratio, it was 50% as shown in Table 2.
• the plate thickness reduction rate was measured in the same manner as in Example 1, as shown in Table 2, it was 2% or less.
• the resulting photosensitive composition for flexographic printing was subjected to a plate making process under the same conditions as in Example 1 to obtain a flexographic printing plate 1j.
• Photosensitive resin composition component parts by weight Styrene-butadiene block copolymer
• the underlayer was observed by enlarging it with an electron microscope, and was dissolved in toluene and discriminated. ⁇ when there is a bulkhead, X when there is no bulkhead
• the present invention can be suitably used in the field of a flexographic printing photosensitive composition used for making a flexographic printing plate, and a flexographic printing plate.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Architecture (AREA)
• Structural Engineering (AREA)
• Optics & Photonics (AREA)
• Plasma & Fusion (AREA)
• Manufacturing & Machinery (AREA)
• Materials For Photolithography (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Photosensitive Polymer And Photoresist Processing (AREA)
• Printing Plates And Materials Therefor (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34917911

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (1)

Citations (4)

• 2004
  • 2004-04-26 JP JP2006510605A patent/JP4433420B2/ja not_active Expired - Fee Related
  • 2004-04-26 CN CN200480042261.4A patent/CN1926471B/zh not_active Expired - Fee Related
  • 2004-04-26 KR KR1020067017817A patent/KR100825169B1/ko not_active IP Right Cessation
  • 2004-04-26 WO PCT/JP2004/005999 patent/WO2005085953A1/ja active Application Filing

Patent Citations (4)

Also Published As

Similar Documents

Legal Events