EP4159441A1 - Originalplatte für eine lithographische druckplatte mit on-machine-entwicklung, verfahren zur herstellung einer lithographischen druckplatte und lithographisches druckverfahren - Google Patents

Originalplatte für eine lithographische druckplatte mit on-machine-entwicklung, verfahren zur herstellung einer lithographischen druckplatte und lithographisches druckverfahren Download PDF

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Publication number
EP4159441A1
EP4159441A1 EP21813857.6A EP21813857A EP4159441A1 EP 4159441 A1 EP4159441 A1 EP 4159441A1 EP 21813857 A EP21813857 A EP 21813857A EP 4159441 A1 EP4159441 A1 EP 4159441A1
Authority
EP
European Patent Office
Prior art keywords
group
lithographic printing
printing plate
formula
plate precursor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21813857.6A
Other languages
English (en)
French (fr)
Other versions
EP4159441A4 (de
Inventor
Kohei Aizu
Kazuaki Enomoto
Ichiro Koyama
Akira Sakaguchi
Akira Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Publication of EP4159441A1 publication Critical patent/EP4159441A1/de
Publication of EP4159441A4 publication Critical patent/EP4159441A4/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B41C1/1016—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/02—Cover layers; Protective layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/12—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by non-macromolecular organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/14—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by macromolecular organic compounds, e.g. binder, adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/08—Developable by water or the fountain solution

Definitions

  • the infrared absorber in the image-recording layer is decomposed by ozone in the atmosphere and leads to a problem of discoloration of the lithographic printing plate precursor.
  • the decomposition rate of the infrared absorber in the image-recording layer after storage for 8 hours in an environment at an ozone concentration of 150 ppb is 50% or less.
  • the decomposition rate of the infrared absorber is measured by the following method.
  • the lithographic printing plate precursor is cut in a square 3 cm on a side when seen from above from the side of the outermost layer. Two samples having the same shape are obtained in this way.
  • the lithographic printing plate precursor according to the present disclosure has an outermost layer on a side of the image-recording layer opposite to the side of the support.
  • the outermost layer in the present disclosure is preferably an ozone blocking layer.
  • the ozone blocking layer is not particularly limited as long as it has an ozone blocking ability that makes it possible to achieve the aforementioned decomposition rate of the infrared absorber by the exposure to ozone.
  • the content of the water-soluble polymer contained in the outermost layer with respect to the total mass of the outermost layer is preferably 20% by mass to 99% by mass, more preferably 30% by mass to 98% by mass, and even more preferably 40% by mass to 97% by mass.
  • the outermost layer contain hydrophobic polymer particles.
  • Whether or not polymer particles are in the outermost layer can be checked by observing the surface of the outermost layer with a scanning electron microscope (SEM).
  • SEM scanning electron microscope
  • the decomposition-type infrared absorber is preferably a cyanine dye having a group that decomposes by exposure to infrared (specifically, R 1 in Formulas 1-1 to 1-7).
  • R 20 is preferably an alkyl group.
  • R 10 in -NR 10 - is preferably an alkyl group.
  • the alkyl group represented by R 10 is preferably an alkyl group having 1 to 10 carbon atoms.
  • the alkyl group represented by R 10 may be linear or branched, or may have a ring structure.
  • the alkyl group may be linear or branched, or may have a ring structure.
  • Me represents a methyl group
  • Et represents an ethyl group
  • * represents a bonding site
  • R 19 to R 22 is preferably an alkyl group or an alkenyl group.
  • the cyanine dye is preferably a compound represented by any of Formula 1-3, Formula 1-5, and Formula 1-6.
  • it is a method of coating an image-recording layer formed on a support with a coating liquid having a concentration of solid contents of 5% by mass to 30% by mass, and drying the obtained coating film under drying condition 70°C to 200°C and 5 seconds to 30 seconds to form an outermost layer.
  • the ratio of halftone dot area rate is preferably 0.92 or more, more preferably 0.94 or more, even more preferably 0.96 or more, and particularly preferably 0.98 or more.
  • the obtained lithographic printing plate precursor having undergone exposure is mounted on a plate cylinder of a printer LITHRONE26 manufactured by KOMORI Corporation, without being subjected to a development treatment.
  • the electron-accepting polymerization initiator is a compound that generates a polymerization initiation species such as a radical or a cation by either or both of light energy and heat energy, and can be appropriately selected from known thermal polymerization initiators, compounds having a bond that requires low bond dissociation energy, photopolymerization initiators, and the like.
  • the electron-accepting polymerization initiator is preferably a radical polymerization initiator and more preferably an onium salt compound.
  • a diaryliodonium salt compound is preferable.
  • a diphenyl iodonium salt compound substituted with an electron-donating group such as an alkyl group or an alkoxyl group is more preferable.
  • an asymmetric diphenyl iodonium salt compound is preferable.
  • the aforementioned electron-accepting polymerization initiator is preferably a compound represented by any of Formula (II) and Formula (III), and particularly preferably a compound represented by Formula (II).
  • R 4 and R 5 each independently represent a hydrogen atom or a monovalent hydrocarbon group having 1 to 20 carbon atoms
  • p and q each independently represent an integer of 1 to 5.
  • p + q 2 to 6.
  • the lowest unoccupied molecular orbital (LUMO) of the electron-accepting polymerization initiator is preferably -3.00 eV or less, and more preferably -3.02 eV or less.
  • the lower limit of the lowest unoccupied molecular orbital (LUMO) of the electron-accepting polymerization initiator is preferably -3.80 eV or more, and more preferably -3.50 eV or more.
  • One kind of electron-accepting polymerization initiator may be used alone, or two or more kinds of electron-accepting polymerization initiators may be used in combination.
  • the image-recording layer in the present disclosure contain an electron-donating polymerization initiator (also called “polymerization aid”) as a polymerization initiator.
  • an electron-donating polymerization initiator also called “polymerization aid”
  • the countercation that the borate compound has may also be a cationic polymethine colorant described in the present disclosure as an infrared absorber.
  • the aforementioned borate compound may be used as the countercation of the cyanine dye.
  • an oligomer having 7 or more polymerizable groups and a molecular weight of 1,000 or more and 10,000 or less is preferable, and an oligomer having 7 or more and 20 or less polymerizable groups and a molecular weight of 1,000 or more and 5,000 or less is more preferable.
  • an epoxy residue refers to a structure formed of an epoxy group.
  • the epoxy residue means a structure similar to a structure established by the reaction between an acid group (carboxylic acid group or the like) and an epoxy group.
  • the polymer particles are preferably selected from the group consisting of thermoplastic polymer particles, thermal reactive polymer particles, polymer particles having a polymerizable group, microcapsules encapsulating a hydrophobic compound, and microgel (crosslinked polymer particles). Among these, polymer particles having a polymerizable group are preferable.
  • the content ratio between the constitutional unit formed of an aromatic vinyl compound and the nitrile group-containing constitutional unit is preferably 5:5 to 9: 1, and more preferably 6:4 to 8:2, based on mass.
  • the resin contained in the thermoplastic polymer particles may contain an acidic group-containing constitutional unit. From the viewpoint of on-press developability and ink receptivity, it is preferable that the resin do not contain an acidic group-containing constitutional unit.
  • hydrophobic group-containing constitutional unit a constitutional unit formed of an alkyl (meth)acrylate compound, an aryl (meth)acrylate compound, or an aralkyl (meth)acrylate compound is preferable, and a constitutional unit formed of an alkyl (meth)acrylate compound is more preferable.
  • the resin contained in the thermoplastic polymer particles may further contain other constitutional units.
  • the molecular weight of the binder polymer that is a polystyrene-equivalent weight-average molecular weight (Mw) determined by GPC is preferably 40,000 or more, and more preferably 40,000 to 300,000.
  • a hydrophilic polymer such as polyacrylic acid or polyvinyl alcohol described in JP2008-195018A can be used in combination.
  • a lipophilic polymer and a hydrophilic polymer can be used in combination.
  • the number of carbon atoms in the alkyl group in Formula (Le-1) to Formula (Le-9) is preferably 1 to 20, more preferably 1 to 8, even more preferably 1 to 4, and particularly preferably 1 or 2.
  • the film thickness of the image-recording layer in the lithographic printing plate precursor according to the present disclosure is preferably 0.1 ⁇ m to 3.0 ⁇ m, and more preferably 0.3 ⁇ m to 2.0 ⁇ m.
  • equivalent circular diameter is a diameter determined on an assumption that the opening portion is in the form of a circle having the same projected area as the projected area of the opening portion.
  • a manufacturing method of the aluminum support in the present disclosure for example, a manufacturing method is preferable in which the following steps are sequentially performed.
  • hydrophilic compound examples include phosphonic acids having an amino group such as carboxymethyl cellulose and dextrin, an organic phosphonic acid, an organic phosphoric acid, an organic phosphinic acid, amino acids, a hydrochloride of an amine having a hydroxy group, and the like.
  • the hydrophilic compound include hydroxycarboxylic acid or a salt thereof.
  • the linking group is composed of at least one atom selected from the group consisting of a hydrogen atom, a carbon atom, an oxygen atom, a nitrogen atom, a sulfur atom, and a halogen atom, and the number of atoms is preferably 1 to 50. Specific examples thereof include an alkylene group, a substituted alkylene group, an arylene group, a substituted arylene group, and the like.
  • the linking group may have a structure in which a plurality of these divalent groups is linked through any of an amide bond, an ether bond, a urethane bond, a urea bond, and an ester bond.
  • the undercoat layer can be formed by dissolving the aforementioned necessary components in a known solvent to prepare a coating liquid, coating a support with the coating liquid by a known method, and drying the coating liquid.
  • the step of forming an outermost layer is the aforementioned method of forming an outermost layer, that is, a step of coating an image-recording layer formed on a support with a coating liquid having a concentration of solid contents of 5% by mass to 30% by mass, and drying the obtained coating film under drying condition 70°C to 200°C and 5 seconds to 30 seconds to form an outermost layer.
  • the method of preparing a lithographic printing plate according to the present disclosure preferably includes a step of exposing the lithographic printing plate precursor according to the present disclosure in the shape of an image (hereinafter, this step will be also called “exposure step”) and a step of removing the image-recording layer in a non-image area by supplying at least one material selected from the group consisting of a printing ink and dampening water on a printer (hereinafter, this step will be also called “on-press development step”).
  • the lithographic printing plate precursor having undergone image exposure is preferably supplied with an oil-based ink and an aqueous component on a printer, such that the image-recording layer in a non-image area is removed and a lithographic printing plate is prepared.
  • Each of the sheets was anodized twice.
  • Each of the anodization treatment baths contained about 100 L of an anodization solution.
  • each sheet was treated for 21.3 seconds under the conditions of an electrolyte concentration of 175 g/L, a temperature of 60°C, and a current density of 5.8 A/dm 2 .
  • each sheet was treated for 18 seconds under the conditions of an electrolyte concentration of 280 g/L, a temperature of 23°C, and a current density of 10 A/dm 2 .
  • the first anodization process for forming an outer aluminum oxide layer was performed using phosphoric acid as an electrolyte
  • the second anodization process for forming an inner aluminum oxide layer was performed using sulfuric acid as an electrolyte.
  • the aluminum plate was subjected to a degreasing treatment at 50°C for 30 seconds by using a 10% by mass aqueous sodium aluminate solution. Then, by using three bundled nylon brushes having a bristle diameter of 0.3 mm and a water suspension of pumice having a median diameter of 25 ⁇ m (specific gravity: 1.1 g/cm 3 ), graining was performed on the surface of the aluminum, and then the aluminum plate was thoroughly rinsed with water.
  • a coating liquid (2-3) for an image-recording layer was prepared in the same manner as in the preparation of the coating liquid (2-1) for an image-recording layer, except that a color developing agent S-4 (the following structure) was used instead of the color developing agent S-1.
  • the exposed precursor was mounted on a Kikuban-sized (636 mm ⁇ 939 mm) cylinder of a printer SX-74 manufactured by Heidelberger Druckmaschinen AG without being developed.
  • This printer was connected to a 100 L-capacity dampening water circulation tank having a non-woven fabric filter and a temperature control device.
  • a circulation device was filled with 80 L of dampening water containing 2.0% by mass of dampening water S-Z1 (manufactured by FUJIFILM Corporation), and an ultraviolet-curable ink T&K UV OFS K-HS black GE-M (manufactured by T&K TOKA CO., LTD.) was used as printing ink.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Materials For Photolithography (AREA)
EP21813857.6A 2020-05-29 2021-05-27 Originalplatte für eine lithographische druckplatte mit on-machine-entwicklung, verfahren zur herstellung einer lithographischen druckplatte und lithographisches druckverfahren Pending EP4159441A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2020095073 2020-05-29
JP2021002219 2021-01-08
PCT/JP2021/020203 WO2021241688A1 (ja) 2020-05-29 2021-05-27 機上現像型平版印刷版原版、平版印刷版の作製方法、及び平版印刷方法

Publications (2)

Publication Number Publication Date
EP4159441A1 true EP4159441A1 (de) 2023-04-05
EP4159441A4 EP4159441A4 (de) 2023-10-18

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EP21813857.6A Pending EP4159441A4 (de) 2020-05-29 2021-05-27 Originalplatte für eine lithographische druckplatte mit on-machine-entwicklung, verfahren zur herstellung einer lithographischen druckplatte und lithographisches druckverfahren

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EP (1) EP4159441A4 (de)
CN (1) CN115666958A (de)
WO (1) WO2021241688A1 (de)

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CN115666958A (zh) 2023-01-31
EP4159441A4 (de) 2023-10-18
WO2021241688A1 (ja) 2021-12-02

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