WO2015008604A1 - 平版印刷版原版及びその製版方法 - Google Patents
平版印刷版原版及びその製版方法 Download PDFInfo
- Publication number
- WO2015008604A1 WO2015008604A1 PCT/JP2014/067273 JP2014067273W WO2015008604A1 WO 2015008604 A1 WO2015008604 A1 WO 2015008604A1 JP 2014067273 W JP2014067273 W JP 2014067273W WO 2015008604 A1 WO2015008604 A1 WO 2015008604A1
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- lithographic printing
- printing plate
- plate precursor
- recording layer
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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
- B41C1/10—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
- B41C1/1025—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 using materials comprising a polymeric matrix containing a polymeric particulate material, e.g. hydrophobic heat coalescing particles
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- 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
- B41N1/14—Lithographic printing foils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/08—Developable by water or the fountain solution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/26—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds
Definitions
- the present invention relates to a lithographic printing plate precursor and a plate making method thereof.
- the present invention relates to a lithographic printing plate precursor capable of image recording by various lasers and on-press development based on a digital signal, and a plate making method thereof.
- the lithographic printing plate is composed of an oleophilic image portion that receives ink in the printing process and a hydrophilic non-image portion that receives dampening water.
- Lithographic printing utilizes the property that water and oil-based inks repel each other, so that the oleophilic image area of the lithographic printing plate is the ink receiving area and the hydrophilic non-image area is dampened with the water receiving area (ink non-receiving area).
- a difference in ink adhesion is caused on the surface of the lithographic printing plate, and after ink is applied only to the image area, the ink is transferred to a printing medium such as paper and printed.
- a lithographic printing plate precursor having a lipophilic photosensitive resin layer (image recording layer, image forming layer) on a hydrophilic support is used, and a mask such as a lithographic film is applied to the lithographic printing plate precursor.
- development processing with an alkaline developer or the like is performed to leave the image recording layer corresponding to the image area, and dissolve and remove the unnecessary image recording layer corresponding to the non-image area.
- CTP computer to plate
- a lithographic printing plate precursor suitable for on-press development is a lithographic printing plate precursor (hereinafter referred to as on-press development type) having an image recording layer from which a non-image portion can be removed by at least one of printing ink and dampening water on a printing press. It is also called a lithographic printing plate precursor).
- on-press development type lithographic printing plate precursor an infrared absorber, a polymerization initiator, a lithographic printing plate precursor (for example, Patent Document 1) having an image recording layer containing a polymerizable compound on a support, an infrared absorber,
- Patent Literature 2 having an image recording layer containing thermoplastic polymer particles on a support is known.
- thermoplastic polymer particles are fused by heat to form an image. It is formed.
- a heat fusion type lithographic printing plate precursor in order to improve printing durability, it is necessary to increase the heat fusion efficiency and increase the image strength.
- the thermoplastic polymer particles are likely to be fused with each other over time, and the on-press developability is lowered. That is, it is difficult to improve both printing durability and on-press developability.
- Patent Document 3 discloses that a compound having an ethylene oxide chain is contained in an image forming layer
- Patent Document 4 discloses a heat-fusible property dispersed with an anionic dispersant. It describes that a fine particle dispersion is contained in an image forming layer.
- the on-press developability is not sufficient. Accordingly, it is demanded to provide excellent on-press developability and sufficient printing durability in a heat fusion type lithographic printing plate precursor.
- An object of the present invention is to provide a heat fusion type lithographic printing plate precursor having excellent on-press developability while maintaining printing durability. Another object is to provide a heat fusion type lithographic printing plate precursor having excellent storage stability.
- A represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkylcarbonyl group having 2 to 5 carbon atoms.
- a in the structural units represented by the general formulas (1) and (2) is a hydrogen atom.
- the lithographic printing plate precursor as described in any one of (1) to (6) above is image-exposed with an infrared laser, and then used on a printing machine using at least one of printing ink and fountain solution. A plate making method for removing unexposed portions of the image recording layer.
- a heat fusion type lithographic printing plate precursor having extremely excellent on-press developability while maintaining printing durability can be obtained.
- a heat fusion type lithographic printing plate precursor having excellent storage stability can be obtained.
- (meth) acrylate means “at least one of acrylate and methacrylate.“ (Meth) acryloyl group ”,“ (meth) acrylic acid ”,“ (meth) acrylic resin ”and the like. Is the same.
- the lithographic printing plate precursor according to the invention has an image recording layer containing (A) a thermoplastic fine particle polymer, (B) an infrared absorber, and (C) a polyglycerol compound on a support, and the polyglycerol compound Is a compound having three or more structural units represented by the general formula (1) and the general formula (2).
- the lithographic printing plate precursor of the present invention can be prepared as a lithographic printing plate by on-press development on a printing machine after image exposure. The lithographic printing plate precursor according to the invention is described in detail below.
- the image recording layer in the lithographic printing plate precursor according to the invention contains (A) a thermoplastic fine particle polymer, (B) an infrared absorber, and (C) a polyglycerol compound.
- A a thermoplastic fine particle polymer
- B an infrared absorber
- C a polyglycerol compound
- the thermoplastic fine particle polymer contained in the image recording layer of the lithographic printing plate precursor according to the invention preferably has a glass transition temperature (Tg) of 60 ° C. to 250 ° C.
- the Tg of the thermoplastic fine particle polymer is more preferably from 70 ° C to 140 ° C, and further preferably from 80 ° C to 120 ° C.
- Examples of the thermoplastic fine particle polymer having a Tg of 60 ° C. or higher include Research Disclosure No. 1 of January 1992. 33303, JP-A-9-123387, JP-A-9-131850, JP-A-9-171249, JP-A-9-171250, and EP931647, and the like. it can.
- homopolymers or copolymers composed of monomers such as ethylene, styrene, vinyl chloride, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, vinylidene chloride, acrylonitrile, vinyl carbazole, or mixtures thereof Etc.
- it is a homopolymer or copolymer composed of styrene, acrylonitrile, or methyl (meth) acrylate, or a mixture thereof, more preferably a homopolymer or copolymer composed of styrene or acrylonitrile, or a mixture thereof.
- the average particle size of the thermoplastic fine particle polymer is preferably 0.005 to 2.0 ⁇ m. If the average particle size is too large, the resolution may be deteriorated, and if it is too small, the temporal stability may be deteriorated. This value is also applied as an average particle diameter when two or more thermoplastic fine particle polymers are mixed.
- the average particle diameter is more preferably 0.01 to 1.5 ⁇ m, particularly preferably 0.05 ⁇ m to 1.0 ⁇ m.
- the polydispersity when two or more thermoplastic fine particle polymers are mixed is preferably 0.2 or more. The average particle size and polydispersity are calculated by laser light scattering.
- thermoplastic fine particle polymers Two or more kinds may be mixed and used. Specifically, at least two kinds of uses having different particle sizes or at least two kinds of uses having different Tg may be mentioned. By using two or more types in combination, the film curability of the image area is further improved, and the printing durability is further improved when a lithographic printing plate is used. For example, when thermoplastic particles having the same particle size are used as the thermoplastic fine particle polymer, there will be a certain amount of voids between the thermoplastic fine particle polymers, and even if the thermoplastic fine particle polymer is melted and solidified by image exposure, Curability may not be as desired.
- thermoplastic fine particle polymer having a different particle size when used, the porosity between the thermoplastic fine particle polymers can be lowered, and as a result, the film curability of the image area after image exposure can be reduced. Can be improved.
- thermoplastic fine particle polymer when the same Tg is used as the thermoplastic fine particle polymer, when the temperature rise of the image recording layer due to image exposure is insufficient, the thermoplastic fine particle polymer is not sufficiently melted and solidified, and the curability of the film is desired. It may not be a thing. In contrast, when a thermoplastic fine particle polymer having a different Tg is used, the film curability of the image area can be improved even when the temperature rise of the image recording layer due to image exposure is insufficient.
- thermoplastic fine particle polymer When two or more kinds of thermoplastic fine particle polymers having different Tg are mixed and used, at least one Tg of the thermoplastic fine particle polymer is preferably 60 ° C. or higher. Under the present circumstances, it is preferable that the difference of Tg is 10 degreeC or more, More preferably, it is 20 degreeC or more. Further, it is preferable to contain 70% by mass or more of the thermoplastic fine particle polymer having a Tg of 60 ° C. or higher based on the total thermoplastic fine particle polymer.
- the thermoplastic fine particle polymer may have a crosslinkable group.
- the crosslinkable group is thermally reacted by the heat generated in the image exposed area to form a crosslink between the polymers, the film strength of the image area is improved, and the printing durability is increased. Will be better.
- the crosslinkable group may be any functional group capable of performing any reaction as long as a chemical bond is formed.
- an ethylenically unsaturated group that performs a polymerization reaction for example, acryloyl group, methacryloyl group, vinyl group, allyl group, etc.
- An isocyanate group that performs an addition reaction, or a block thereof and a group having an active hydrogen atom that is a reaction partner for example, an amino group, a hydroxy group, a carboxyl group, etc.
- an epoxy group that also performs an addition reaction, and a reaction partner thereof
- examples thereof include an amino group, a carboxyl group or a hydroxy group, a carboxyl group and a hydroxy group or an amino group that perform a condensation reaction, an acid anhydride that performs a ring-opening addition reaction, an amino group or a hydroxy group, and the like.
- thermoplastic fine particle polymer having a crosslinkable group examples include acryloyl group, methacryloyl group, vinyl group, allyl group, epoxy group, amino group, hydroxy group, carboxyl group, isocyanate group, acid anhydride and the like.
- examples thereof include those having a crosslinkable group such as a group in which the above is protected.
- the introduction of these crosslinkable groups into the polymer may be performed during the polymerization of the fine particle polymer, or may be performed using a polymer reaction after the polymerization of the fine particle polymer.
- a crosslinkable group is introduced during the polymerization of the fine particle polymer, it is preferable to carry out emulsion polymerization or suspension polymerization of the monomer having a crosslinkable group.
- the monomer having a crosslinkable group include allyl methacrylate, allyl acrylate, vinyl methacrylate, vinyl acrylate, glycidyl methacrylate, glycidyl acrylate, 2-isocyanate ethyl methacrylate, or a block isocyanate based on alcohol thereof, 2-isocyanate ethyl acrylate or the like.
- Examples of the polymer reaction used when the crosslinkable group is introduced after the polymerization of the fine particle polymer include the polymer reaction described in WO96 / 34316.
- the thermoplastic fine particle polymer may react with each other through a crosslinkable group, or may react with a high molecular compound or a low molecular compound added to the image recording layer.
- the content of the thermoplastic fine particle polymer is preferably 50 to 95% by mass, more preferably 60 to 90% by mass, and particularly preferably 70 to 85% by mass based on the solid content of the image recording layer.
- the infrared absorber contained in the image recording layer of the lithographic printing plate precursor according to the invention is preferably a dye or pigment having an absorption maximum of 760 to 1200 nm. A dye is more preferred.
- the dye examples include commercially available dyes and literature (for example, “Dye Handbook” edited by the Society of Synthetic Organic Chemistry, published in 1970, “Chemical Industry”, May 1986, pages 45-51, “Near-Infrared Absorbing Dye”, “90 Development and market trends of age functional pigments "Chapter 2 Section 2.3 (CMC Publishing, published in 1990) or patents can be used.
- Specific examples include azo dyes and metal complex azo dyes. Infrared absorbing dyes such as pyrazolone azo dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, quinoneimine dyes, polymethine dyes and cyanine dyes are preferred.
- near-infrared absorption sensitizers described in US Pat. No. 5,156,938 are also preferably used as dyes, and substituted arylbenzo (thio) pyrylium described in US Pat. No. 3,881,924.
- the pentamethine thiopyrylium salt described in No. 283,475, Epolite III-178, Epolite III-130, Epolite III-125, etc. manufactured by Eporin are also preferred. Used.
- a particularly preferable dye to be added to the image recording layer is an infrared absorbing dye having a water-soluble group.
- Specific examples of the infrared absorbing dye are shown below, but the present invention is not limited thereto.
- pigments examples include commercially available pigment and color index (CI) manuals, “Latest Pigment Handbook” (edited by the Japan Pigment Technology Association, published in 1977), “Latest Pigment Applied Technology” (published by CMC, published in 1986), “Printing” The pigments described in “Ink Technology” (CMC Publishing, 1984) can be used.
- CI pigment and color index
- pigments include black pigments, brown pigments, red pigments, purple pigments, blue pigments, green pigments, fluorescent pigments, metal powder pigments, and other polymer-bonded pigments.
- quinophthalone pigments, dyed lake pigments, azine pigments, nitroso pigments, nitro pigments, natural pigments, fluorescent pigments, inorganic pigments, carbon black, and the like can be used.
- the pigment may be used without surface treatment or may be used after surface treatment.
- Surface treatment methods include surface coating with hydrophilic resins and lipophilic resins, methods of attaching surfactants, reactive substances (eg, silica sol, alumina sol, silane coupling agents, epoxy compounds, isocyanate compounds, etc.) For example, a method of binding the pigment surface to the pigment surface.
- the above-mentioned surface treatment methods are described in “Characteristics and Applications of Metal Soap” (Shobobo), “Printing Ink Technology” (CMC Publishing, 1984) and “Latest Pigment Application Technology” (CMC Publishing, 1986). Yes.
- the particle diameter of the pigment is preferably 0.01 to 1 ⁇ m, more preferably 0.01 to 0.5 ⁇ m.
- a method for dispersing the pigment a known dispersion technique used in ink production, toner production, or the like can be used. Details are described in "Latest Pigment Applied Technology” (CMC Publishing, 1986).
- the content of the infrared absorber is preferably from 0.1 to 30% by mass, more preferably from 0.25 to 25% by mass, and particularly preferably from 0.5 to 20% by mass based on the solid content of the image recording layer. Within this range, good sensitivity can be obtained without impairing the film strength of the image recording layer.
- polyglycerol compound contained in the image recording layer of the lithographic printing plate precursor according to the invention is a compound having three or more structural units represented by the following general formula (1) and general formula (2).
- A represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkylcarbonyl group having 2 to 5 carbon atoms.
- a hydrogen atom, a methyl group, an ethyl group, a methylcarbonyl group or an ethylcarbonyl group is preferable, and a hydrogen atom is particularly preferable.
- the number of structural units represented by the general formulas (1) and (2) in the polyglycerol compound is preferably 3 to 500, more preferably 3 to 200, still more preferably 3 to 100, and particularly preferably 6 to 60. preferable.
- the hydroxyl value of the polyglycerol compound is preferably 670 to 1100, more preferably 770 to 1100.
- the hydroxyl value is the number of mg of potassium hydroxide required to neutralize acetic acid bonded to a hydroxyl group when 1 g of the polyglycerol compound is acetylated.
- the number of mg of potassium hydroxide is calculated according to Japan Oils and Fats Chemistry Association, “Established by Japan Oils and Fats Chemistry Society, Standard Oil and Fat Analysis Test Method (I), 2013 edition”.
- the polyglycerol compound may be a linear compound or a branched compound.
- a in the general formula (1) or the general formula (2) becomes a single bond, and the structural unit represented by the general formula (1) or the general formula (2) is bonded to the branched compound. It has the structure which forms.
- the polyglycerol compound includes a structural unit represented by the following (a) or (b) (where O * represents a position to which the branched chain is bonded).
- the polyglycerol compound may contain a cyclic structural unit containing a hydrogen atom, for example, a structural unit represented by the following (c).
- the terminal structure of the polyglycerol compound is any one of a hydroxy group, an alkoxy group having 1 to 4 carbon atoms, or an alkylcarbonyloxy group having 2 to 5 carbon atoms. It is preferable that all terminal structures are hydroxy groups.
- the polyglycerol compound is substantially composed only of the structural units represented by the general formula (1) and the general formula (2), has a large number of hydroxy groups, and some of the hydroxy groups have 4 or less carbon atoms. Even when it is substituted with an alkyl group or an alkylcarbonyl group having 5 or less carbon atoms, the polyglycerol compound has extremely high hydrophilicity and does not substantially exhibit a surface-active effect. For this reason, during on-press development, the fountain solution does not penetrate into the exposed area (image area) of the image recording layer, thereby reducing the hydrophobicity and film strength of the image area. Good printability can be maintained.
- the polyglycerol compound is synthesized by a known method.
- polyglycerin ester Sakamoto Pharmaceutical Co., Ltd. edition, published in 1994
- Commercially available products can also be used, for example, polyglycerin # 310, polyglycerin # 500, polyglycerin # 750 (manufactured by Sakamoto Pharmaceutical Co., Ltd.), polyglycerin (manufactured by Yokkaichi Gosei Co., Ltd.), polyglycerin PGL. 06, polyglycerin PGL 10, polyglycerin PGL X (manufactured by Daicel Corporation) and the like.
- the content of the polyglycerol compound is preferably from 0.1 to 30% by mass, more preferably from 0.5 to 20% by mass, based on the solid content of the image recording layer.
- polyglycerol compound used in the present invention is listed below, but the present invention is not limited to these.
- the planographic printing plate precursor of the present invention has excellent on-press developability by containing a polyglycerol compound in the image recording layer. This excellent on-press developability is maintained well even when the lithographic printing plate precursor is stored over time by further containing a surfactant having a polyoxyalkylene group or a hydroxy group in the image recording layer. That is, the lithographic printing plate precursor of the present invention having an image recording layer containing a polyglycerol compound or a surfactant having a polyoxyalkylene chain or a hydroxy group is excellent even when stored under high temperature or high temperature and high humidity conditions. In-machine developability.
- surfactant having polyoxyalkylene group or hydroxy group As the surfactant having a polyoxyalkylene group (hereinafter also referred to as POA group) or a hydroxy group contained in the image recording layer of the present invention, a surfactant having a POA group or a hydroxy group can be appropriately used. However, anionic surfactants or nonionic surfactants are preferred. Among the anionic surfactants or nonionic surfactants having a POA group or a hydroxy group, anionic surfactants or nonionic surfactants having a POA group are preferred.
- a polyoxyethylene group a polyoxypropylene group, a polyoxybutylene group and the like are preferable, and a polyoxyethylene group is particularly preferable.
- the average degree of polymerization of the oxyalkylene group is usually from 2 to 50, preferably from 2 to 20.
- the number of hydroxy groups is usually 1 to 10 and preferably 2 to 8. However, the terminal hydroxy group in the oxyalkylene group is not included in the number of hydroxy groups.
- the anionic surfactant having a POA group is not particularly limited, and polyoxyalkylene alkyl ether carboxylates, polyoxyalkylene alkyl sulfosuccinates, polyoxyalkylene alkyl ether sulfates, alkylphenoxy polyoxyalkylene propyl sulfonic acids Salts, polyoxyalkylene alkyl sulfophenyl ethers, polyoxyalkylene aryl ether sulfates, polyoxyalkylene polycyclic phenyl ether sulfates, polyoxyalkylene styryl phenyl ether sulfates, polyoxyalkylene alkyl ether phosphates, Polyoxyalkylene alkyl phenyl ether phosphate ester salts, polyoxyalkylene perfluoroalkyl ether Phosphoric acid ester salts, and the like.
- the anionic surfactant having a hydroxy group is not particularly limited, and examples thereof include hydroxycarboxylates, hydroxyalkyl ether carboxylates, hydroxyalkanesulfonates, fatty acid monoglyceride sulfates, and fatty acid monoglyceride phosphates. .
- the anionic surfactant having a POA group or a hydroxy group is preferably a compound represented by the following general formula (S1).
- R 1 -Y 1 -X 1 general formula (S1) R 1 represents an alkyl group or an aryl group.
- Y 1 represents a single bond, an alkylene group, a polyoxyalkylene group, an arylene group, —O—, —NH—, a carbonyl group, or a divalent linking group formed by combining two or more of these groups.
- X 1 represents an acid group or a salt thereof. However, at least one of R 1 and Y 1 includes at least one polyoxyalkylene group or hydroxy group.
- the alkyl group represented by R 1 is preferably a linear, branched or cyclic alkyl group having 6 to 30 carbon atoms. Specific examples of the alkyl group include hexyl group, heptyl group, octyl group, nonyl group, decyl group, isohexyl group, 2-ethylhexyl group, 2-methylhexyl group, cyclohexyl group, 1-adamantyl group, and 2-norbornyl group. , Lauryl group, stearyl group and the like.
- the aryl group represented by R 1 is preferably an aryl group having 6 to 30 carbon atoms, and more preferably an aryl group having 6 to 10 carbon atoms. Specific examples of the aryl group include a phenyl group, a naphthyl group, an indenyl group, and an anthranyl group.
- the alkylene group or arylene group represented by R 1 may have a
- the alkylene group represented by Y 1 is preferably an alkylene group having 18 or less carbon atoms, and more preferably an alkylene group having 6 or less carbon atoms.
- Specific examples of the alkylene group include a methylene group, an ethylene group, a propylene group, and a butylene group.
- the polyoxyalkylene group represented by Y 1 is preferably a polyoxyethylene group or a polyoxypropylene group, and more preferably a polyoxyethylene group.
- the arylene group represented by Y 1 is preferably an arylene group having 6 to 30 carbon atoms, and more preferably an arylene group having 6 to 10 carbon atoms.
- the alkylene group or arylene group represented by Y 1 may have a substituent.
- Y 1 is preferably a single bond, a polyoxyalkylene group, an alkylene group, —O—, a carbonyl group, or a divalent linking group in which two or more of these groups are combined.
- — (OCH 2 CH 2 ) n —O— (n represents an integer of 2 to 30)
- m represents an integer of 1 to 18.
- R 1 or Y 1 may have include a halogen atom (for example, a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom) or a monovalent nonmetallic atomic group.
- a halogen atom for example, a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom
- a monovalent nonmetallic atomic group an alkyl group (a linear, branched, or cyclic substituted or unsubstituted alkyl group having 1 to 30 carbon atoms is preferable, and an alkyl group having 1 to 20 carbon atoms is more preferable.
- An acyloxy group (preferably a formyloxy group, a substituted or unsubstituted alkylcarbonyloxy group having 2 to 30 carbon atoms, a substituted or unsubstituted arylcarbonyloxy group having 6 to 30 carbon atoms, such as formyloxy, acetyl Oxy, pivaloyloxy, stearoyloxy, ben Yloxy, p-methoxyphenylcarbonyloxy, etc.), a sulfo group or a salt thereof, an aryloxycarbonyl group (preferably a substituted or unsubstituted aryloxycarbonyl group having 7 to 30 carbon atoms, such as phenoxycarbonyl, o-chlorophenoxy) Carbonyl, m-nitrophenoxycarbonyl, pt-butylphenoxycarbonyl, etc.), alkoxycarbonyl groups (preferably substituted or unsubstituted alkoxycarbonyl groups having 2
- the hydrogen atom Mashiku, m is preferably an integer of 2 to 30, an integer of 2 to 20 is more preferred.
- polyoxyethylene group — (OCH 2 CH 2 ) m —OH, polyoxypropylene group — (OCH 2 CH (CH 3 ) m —OH)) may be mentioned as examples.
- those having a hydrogen atom may be substituted with the above substituents after removing the hydrogen atom.
- an alkyl group, an alkoxy group, an aryloxy group, a hydroxy group, a sulfo group or a salt thereof, and a polyoxyalkylene group are preferable.
- X 1 is preferably —SO 3 H, —COOH, —PO 3 H 2 or a salt thereof.
- the cationic group that forms a salt with the acid group is not particularly limited as long as it is a cationic group.
- inorganic cationic groups such as lithium cation, sodium cation and potassium cation, and organic cation groups such as quaternary ammonium group and quaternary phosphonium group are preferable.
- Nonionic surfactant having POA group or hydroxy group The nonionic surfactant having a POA group is not particularly limited, and polyoxyalkylene alkyl ethers, polyoxyalkylene glyceryl ether fatty acid esters, polyoxyalkylene alkyl phenyl ethers, polyoxyalkylene alkyl naphthyl ethers, polyoxyethylene Polyoxypropylene glycols, polyoxyalkylene fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, fatty acid polyoxyalkylene sorbits, polyoxyalkylene hydrogenated castor oil, polyether-modified silicone oils, glycerin fatty acid esters, sorbitan fatty acid esters Sucrose fatty acid esters, alkyl glyceryl ethers, alkyl glycosides, polyoxyalkylene perfluoroalkyl Ether and the like.
- the nonionic surfactant having a hydroxy group is not particularly limited, but glycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkyl glyceryl ether, polyoxyalkylene sorbitan fatty acid esters, fatty acid alkanolamides, alkyl Examples include glycosides, fluorotelomer alcohols, polyether-modified silicone oils, and the like.
- the nonionic surfactant having a POA group or a hydroxy group is preferably a compound represented by the following general formula (S2).
- R 21 —Y 2 —R 22 general formula (S2) In the general formula (S2), R 21 represents an alkyl group, an aryl group, or a cyclic ether group. Y 2 represents a single bond, an alkylene group, a polyoxyalkylene group, an arylene group, —O—, —NH—, a carbonyl group, or a divalent linking group in which two or more of these groups are combined.
- R 22 represents a hydrogen atom or a hydroxy group.
- the surfactant represented by the general formula (S2) has at least one polyoxyalkylene group or hydroxy group.
- the alkyl group and aryl group represented by R 21 are synonymous with the alkyl group and aryl group represented by R 1 in formula (S1), and the preferred ranges are also the same.
- the alkylene group or arylene group represented by R 21 may have a substituent.
- the cyclic ether group represented by R 21 is preferably a cyclic ether group having 2 to 6 carbon atoms, and more preferably a cyclic ether group having 5 to 6 carbon atoms. Specific examples of the cyclic ether group include an oxetanyl group, a tetrahydrofuranyl group, and a tetrahydropyranyl group.
- the alkylene group represented by Y 2 is preferably an alkylene group having 18 or less carbon atoms, and more preferably an alkylene group having 6 or less carbon atoms.
- Specific examples of the alkylene group include a methylene group, an ethylene group, a propylene group, and a butylene group.
- the polyoxyalkylene group represented by Y 2 is — (OC n H 2n ) m — (n is preferably an integer of 2 to 4, more preferably an integer of 2 to 3. m is an integer of 2 to 30. And an integer of 2 to 20.
- C n H 2n represents a linear or branched alkylene group.
- the polyoxyalkylene group is preferably a polyoxyethylene group represented by — (OCH 2 CH 2 ) m — or a polyoxypropylene group represented by — (OCH 2 CH (CH 3 )) m —.
- An ethylene group is more preferable.
- the arylene group represented by Y 2 is preferably an arylene group having 6 to 30 carbon atoms, and more preferably an arylene group having 6 to 10 carbon atoms.
- the alkylene group or arylene group represented by Y 2 may have a substituent.
- Y 2 is preferably a polyoxyalkylene group, an alkylene group, —O—, —NH—, a carbonyl group, or a divalent linking group in which two or more of these groups are combined.
- — (OCH 2 CH 2 ) n —O— (n represents an integer of 2 to 30)
- m represents an integer of 1 to 18
- —C (O) —O— (CH 2 ) n— represents an integer of 1 to 6
- —C (O) —NH— (CH 2 ) n— represents an integer of 1 to 6) and the like.
- R 21 or Y 2 may have is the same as the substituent that R 1 or Y 1 in General Formula (S1) may have except for a sulfo group or a salt thereof, and a preferred range is also included. It is the same.
- the content of the surfactant having a POA group or a hydroxy group is preferably 0.05 to 15% by mass, more preferably 0.1 to 10% by mass, based on the solid content of the image recording layer.
- surfactant having a POA group or a hydroxy group used in the present invention are listed below, but the present invention is not limited to these.
- the following surfactant A-12 is available from DuPont under the trade name Zonyl FSP.
- the following surfactant N-11 is available from DuPont under the trade name Zonyl FSO 100.
- the image recording layer of the present invention may contain an anionic surfactant having no polyoxyalkylene group and hydroxy group for the purpose of ensuring the uniformity of application of the image recording layer.
- the anionic surfactant is not particularly limited as long as the above object is achieved.
- alkylbenzenesulfonic acid or a salt thereof, alkylnaphthalenesulfonic acid or a salt thereof, (di) alkyldiphenyl ether (di) sulfonic acid or a salt thereof, or an alkyl sulfate ester salt is preferable.
- the addition amount of the anionic surfactant having no polyoxyalkylene group and hydroxy group is preferably 1 to 50% by mass, more preferably 1 to 30% by mass with respect to the surfactant having a polyoxyalkylene group or hydroxy group. preferable.
- anionic surfactant having no polyoxyalkylene group and hydroxy group are listed below, but the present invention is not limited thereto.
- a nonionic surfactant having no polyoxyalkylene group and hydroxy group or a fluorine-based surfactant may be used.
- a fluorosurfactant described in JP-A No. 62-170950 is preferably used.
- the image recording layer of the present invention can contain a hydrophilic resin.
- the hydrophilic resin include hydrophilic groups such as hydroxy group, hydroxyethyl group, hydroxypropyl group, amino group, aminoethyl group, aminopropyl group, carboxyl group, carboxylate group, sulfo group, sulfonate group, and phosphate group.
- the resin it has is preferable.
- hydrophilic resins include gum arabic, casein, gelatin, starch derivatives, carboxymethylcellulose and its sodium salt, cellulose acetate, sodium alginate, vinyl acetate-maleic acid copolymers, styrene-maleic acid copolymers, polyacrylic acids and Salts thereof, polymethacrylic acids and salts thereof, homopolymers and copolymers of hydroxyethyl methacrylate, homopolymers and copolymers of hydroxyethyl acrylate, homopolymers and copolymers of hydroxypropyl methacrylate, homopolymers and copolymers of hydroxypropyl acrylate, hydroxybutyl Methacrylate homopolymers and copolymers, hydroxybutyl acrylate homopolymers and copolymers, polyesters Lenglycols, hydroxypropylene polymers, polyvinyl alcohols, hydrolyzed polyvinyl acetate having a degree of hydrolysis of at least 60%,
- the molecular weight of the hydrophilic resin is preferably 2000 or more. If it is less than 2000, sufficient film strength and printing durability cannot be obtained, which is not preferable.
- the content of the hydrophilic resin is preferably 0.5 to 50% by mass, more preferably 1 to 30% by mass, based on the solid content of the image recording layer.
- Inorganic fine particles may be added to the image recording layer of the present invention.
- Preferred examples of the inorganic fine particles include silica, alumina, magnesium oxide, titanium oxide, magnesium carbonate, calcium alginate, and a mixture thereof.
- the inorganic fine particles can be used for strengthening the film.
- the average particle size of the inorganic fine particles is preferably 5 nm to 10 ⁇ m, more preferably 10 nm to 1 ⁇ m. Within this range, it is possible to form a non-image portion having excellent hydrophilicity that is stably dispersed with the thermoplastic fine particle polymer, sufficiently retains the film strength of the image recording layer, and hardly causes printing stains.
- the inorganic fine particles can be easily obtained as a commercial product such as a colloidal silica dispersion.
- the content of the inorganic fine particles is preferably 1.0 to 70% by mass, more preferably 5.0 to 50% by mass, based on the solid content of the image recording layer.
- a plasticizer can be added to the image recording layer of the present invention in order to impart flexibility of the coating film.
- the plasticizer include polyethylene glycol, tributyl citrate, diethyl phthalate, dibutyl phthalate, dihexyl phthalate, dioctyl phthalate, tricresyl phosphate, tributyl phosphate, trioctyl phosphate, tetrahydrofurfuryl oleate, and the like. It is done.
- the content of the plasticizer is preferably 0.1% to 50% by mass, more preferably 1 to 30% by mass, based on the solid content of the image recording layer.
- a compound that initiates or accelerates the reaction of the heat-reactive functional group (crosslinkable group) as necessary can be added.
- the compound that initiates or accelerates the reaction of the thermoreactive functional group include compounds that generate radicals or cations by heat. Examples thereof include lophine dimer, trihalomethyl compound, peroxide, azo compound, diazonium salt, onium salt including diphenyliodonium salt, acylphosphine, imide sulfonate and the like.
- the amount of such a compound added is preferably 1 to 20% by mass, more preferably 1 to 10% by mass, based on the solid content of the image recording layer. Within this range, good reaction initiation or acceleration effect can be obtained without impairing on-press developability.
- the image recording layer of the present invention is formed by preparing or applying a coating solution by dissolving or dispersing the necessary components described above in a suitable solvent and coating the support.
- a suitable solvent water or a mixed solvent of water and an organic solvent is used, and mixed use of water and an organic solvent is preferable in terms of improving the surface state after coating.
- the amount of the organic solvent varies depending on the type of the organic solvent, and cannot be generally specified, but is usually preferably 5 to 50% by volume in the mixed solvent. However, it is necessary to use the organic solvent in such an amount that the thermoplastic fine particle polymer does not aggregate.
- the solid content concentration of the image recording layer coating solution is preferably 1 to 50% by mass.
- the organic solvent used as the solvent for the coating solution is preferably an organic solvent that is soluble in water.
- alcohol solvents such as methanol, ethanol, propanol, isopropanol, 1-methoxy-2-propanol, ketone solvents such as acetone and methyl ethyl ketone, glycol ether solvents such as ethylene glycol dimethyl ether, ⁇ -butyrolactone, N, N—
- Examples include dimethylformamide, N, N-dimethylacetamide, tetrahydrofuran, dimethyl sulfoxide and the like.
- an organic solvent having a boiling point of 120 ° C. or less and a solubility in water (amount dissolved in 100 g of water) of 10 g or more is preferable, and an organic solvent of 20 g or more is more preferable.
- the coating amount (solid content) of the image recording layer on the support obtained after coating and drying varies depending on the use, but is generally preferably 0.5 to 5.0 g / m 2 , and preferably 0.5 to 2. 0 g / m 2 is more preferable.
- the support used for the lithographic printing plate precursor according to the invention is a substrate having a hydrophilic surface or a substrate having a hydrophilic surface provided by coating a hydrophilic layer or the like.
- paper, paper laminated with plastic for example, polyethylene, polypropylene, polystyrene, etc.
- metal plate for example, aluminum, zinc, copper, etc.
- plastic film for example, cellulose diacetate, cellulose triacetate, Cellulose propionate, cellulose butyrate, cellulose acetate butyrate, cellulose nitrate, polyethylene terephthalate, polyethylene, polystyrene, polypropylene, polycarbonate, polyvinyl acetal, etc.
- a coated substrate may be mentioned.
- a preferable support includes a polyester film coated with an aluminum plate and a hydrophilic layer.
- the aluminum plate includes a pure aluminum plate and an alloy plate containing aluminum as a main component and containing a trace amount of different elements, and may be a plate obtained by laminating plastic on a thin plate of aluminum or an aluminum alloy.
- Examples of foreign elements contained in the aluminum alloy include silicon, iron, manganese, copper, magnesium, chromium, zinc, bismuth, nickel, and titanium. The content of foreign elements in the alloy is 10% or less.
- an aluminum plate from an aluminum ingot using a DC casting method or an aluminum plate from an ingot by a continuous casting method may be used.
- conventionally publicly known materials such as JIS A 1050, JIS A 1100, JIS A 3103, JIS A 3005, and the like can be used as appropriate.
- the thickness of the substrate is usually 0.05 to 0.6 mm, preferably 0.1 to 0.4 mm, and particularly preferably 0.15 to 0.3 mm.
- an aluminum plate for a lithographic printing plate precursor includes a degreasing step for removing rolling oil adhering to the aluminum plate, a desmutting step for dissolving and removing the smut on the surface of the aluminum plate, and a roughening for roughening the surface of the aluminum plate. It is manufactured through the surface treatment process.
- the aluminum plate is subjected to a dissolution treatment using an alkaline aqueous solution such as caustic soda to remove strong dirt and natural oxide film, etc., and neutralizes residual alkali components after the treatment.
- neutralization treatment is performed by immersing in an acid such as nitric acid, sulfuric acid, hydrochloric acid, chromic acid or a mixed acid thereof.
- an acid such as nitric acid, sulfuric acid, hydrochloric acid, chromic acid or a mixed acid thereof.
- a solvent degreasing treatment with trichlene, thinner or the like, or an emulsion degreasing treatment with an emulsion such as kerosene or triethanol may be performed.
- the type and composition of the acid used for the neutralization treatment are changed to the electrochemical roughening treatment. It is preferable to match the type and composition of the acid used for the treatment.
- the roughening treatment of the aluminum plate surface is performed by various methods. Examples thereof include a method of mechanically roughening, a method of electrochemically dissolving and roughening a surface, a method of chemically selectively dissolving a surface, and a combination of these methods.
- the mechanical roughening method a known method such as a ball polishing method, a brush polishing method, a blast polishing method, or a buff polishing method can be used.
- the chemical roughening method a method of immersing in a saturated aqueous solution of an aluminum salt of a mineral acid as described in JP-A No. 54-31187 is suitable.
- an electrochemical surface roughening method there is a method of performing alternating current or direct current in an electrolytic solution containing an acid such as hydrochloric acid or nitric acid.
- an electrolytic chemical roughening method using a mixed acid can also be used.
- the roughening is preferably performed in such a range that the center line average roughness (Ra) of the aluminum plate surface is 0.2 to 1.0 ⁇ m.
- the roughened aluminum plate is subjected to an alkali etching treatment using an aqueous solution such as potassium hydroxide or sodium hydroxide as necessary, and further subjected to a neutralization treatment.
- an alkali etching treatment using an aqueous solution such as potassium hydroxide or sodium hydroxide as necessary, and further subjected to a neutralization treatment.
- a hydrophilic film on the aluminum plate that has been subjected to the surface roughening treatment and other treatments as necessary.
- a support provided with a hydrophilic film having a density of 1000 to 3200 kg / m 3 has good film strength and resistance to soiling in printing, and heat generated in the image recording layer is dissipated to the support. It is preferable because of its good heat insulating property.
- the density is measured by, for example, observing the mass and cross section of the hydrophilic layer with a Mason method (dissolving the hydrophilic film with a chromic acid / phosphoric acid mixed solution to obtain the mass of the hydrophilic film) with a scanning electron microscope (SEM). It can calculate with the following formula
- Density (kg / m 3 ) (hydrophilic film mass per unit area) / film thickness
- the hydrophilic film density is less than 1000 kg / m 3 , the film strength is low, which may adversely affect image forming properties, printing durability, and the like, and may be less resistant to stains in printing. If the hydrophilic film density exceeds 3200 kg / m 3 , sufficient heat insulation cannot be obtained, and the sensitivity improvement effect may be reduced.
- the method for providing the hydrophilic film is not particularly limited, and an anodizing method, a vapor deposition method, a CVD method, a sol-gel method, a sputtering method, an ion plating method, a diffusion method, and the like can be appropriately used. Moreover, the method of apply
- an anodizing process that is, an anodizing process.
- the anodizing treatment can be performed by a method conventionally used in this field. Specifically, when direct current or alternating current is applied to an aluminum plate in an aqueous solution or non-aqueous solution of sulfuric acid, phosphoric acid, chromic acid, oxalic acid, sulfamic acid, benzenesulfonic acid, etc., alone or in combination of two or more.
- An anodized film that is a hydrophilic film can be formed on the surface of the aluminum plate.
- the conditions for anodizing treatment vary depending on the electrolyte used, and cannot be determined unconditionally. In general, however, the electrolyte concentration is 1 to 80%, the solution temperature is 5 to 70 ° C., and the current density is 0.5 to 60 A / dm 2 , voltage 1 to 200 V, and electrolysis time 1 to 1000 seconds are suitable.
- anodizing treatments a method of anodizing at a high current density in a sulfuric acid electrolyte solution described in British Patent 1,412,768, and anodizing treatment using phosphoric acid described in US Pat. No. 3,511,661 as an electrolytic bath The method of doing is preferable. Further, multi-stage anodizing treatment such as anodizing treatment in sulfuric acid and further anodizing treatment in phosphoric acid can be performed.
- the amount of the anodized film is preferably 1.5 g / m 2 or more from the viewpoint of effectively preventing the non-image area from being damaged and causing stains.
- the support may be used as it is with the roughened aluminum plate having an anodized film as described above, but for further improvements such as adhesion to the upper layer, hydrophilicity, dirt resistance, heat insulation, etc.
- surface hydrophilization treatment with polyvinylphosphonic acid as described in JP-A-4,689,272 can be appropriately selected and performed.
- an inorganic undercoat layer such as a water-soluble metal salt such as zinc borate or an organic undercoat layer
- examples of the organic compound used in the organic undercoat layer include carboxymethylcellulose, dextrin, gum arabic, polymers and copolymers having a sulfonic acid group in the side chain, polyacrylic acid, 2-aminoethylphosphonic acid, and other amino groups.
- the organic undercoat layer can be provided by the following method. That is, a coating solution is prepared by dissolving an organic compound in water or an organic solvent such as methanol, ethanol, methyl ethyl ketone, or a mixed solvent thereof to a concentration of 0.005 to 10% by weight.
- An undercoat layer is formed by coating and drying on a support such as a plate. The coating is performed by various methods, and any method such as bar coater coating, spin coating, spray coating, or curtain coating may be used.
- the coating amount after drying of the organic undercoat layer is suitably 2 to 200 mg / m 2 , preferably 5 to 100 mg / m 2 . In this range, good printing durability can be obtained.
- the undercoat layer may contain a photothermal conversion agent.
- a back coat layer containing an organic polymer compound described in JP-A-5-45885, an alkoxy compound of silicon described in JP-A-6-35174, or the like is provided on the back surface of the support. Can do.
- a protective layer (overcoat layer) can be provided on the image recording layer.
- the protective layer protects the hydrophilic image recording layer surface from contamination with lipophilic substances during storage and fingerprint trace contamination due to finger contact during handling, prevention of scratches in the image recording layer, and high-intensity laser It has a function of preventing ablation at the time of exposure and a function of suppressing an image formation inhibition reaction by blocking oxygen.
- the overcoat layer can be easily removed on a printing press, and either a water-soluble polymer or a water-swellable polymer partially crosslinked with a water-soluble polymer can be appropriately selected and used. Two or more types can be mixed and used.
- the water-soluble polymer is selected from water-soluble natural polymers and synthetic polymers. The water-soluble polymer is used alone or in combination with a crosslinking agent, and the film after coating and drying has film-forming ability.
- water-soluble polymers include natural gums, gum arabic, water-soluble soybean polysaccharide, fiber derivatives (eg, carboxymethylcellulose, carboxyethylcellulose, methylcellulose, etc.), modified products thereof, white dextrin, pullulan, enzymatic degradation
- synthetic polymers such as etherified dextrin, polyvinyl alcohol (polyvinyl acetate having a hydrolysis degree of 65% or more) and modified polyvinyl alcohol (acid-modified polyvinyl alcohol having a carboxyl group or a sulfo group are preferably used.
- Preferred examples thereof include modified polyvinyl alcohols described in JP-A-2005-250216 and JP-A-2006-259137.), Polyvinylpyrrolidone, poly (meth) acrylonitrile, polyacrylic acid, an alkali metal salt thereof, or Amine salt, polyacrylic acid copolymer alkali metal salt or amine salt, polymethacrylic acid alkali metal salt or amine salt, vinyl alcohol / acrylic acid copolymer alkali metal salt or amine salt, polyacrylamide copolymer , Polyhydroxyethyl acrylate, polyvinyl methyl ether, vinyl methyl ether / maleic anhydride copolymer, poly-2-acrylamido-2-methyl-1-propanesulfonic acid, its alkali metal salt or amine salt, poly-2-acrylamide Examples thereof include 2-methyl-1-propanesulfonic acid copolymer, alkali metal salt or amine salt thereof, and polymers described in US Pat. No. 3,458,311
- the crosslinking is performed by a crosslinking reaction using a reactive functional group possessed by the water-soluble polymer.
- the crosslinking reaction may be a covalent bond or an ionic bond.
- Crosslinking reduces the adhesiveness of the overcoat layer surface and improves the handling of the lithographic printing plate precursor, but if the crosslinking proceeds too much, the overcoat layer changes to oleophilic and the overcoat layer is removed on the printing press. Moderate partial cross-linking is preferred.
- the preferred degree of partial cross-linking is that when the lithographic printing plate precursor is immersed in water at 25 ° C., the overcoat layer does not elute for 30 seconds to 10 minutes, but the overcoat layer dissolves for more than 10 minutes. Is to the extent that is recognized.
- the compound (crosslinking agent) used in the crosslinking reaction include known polyfunctional compounds having crosslinkability. Specifically, polyepoxy compounds, polyamine compounds, polyisocyanate compounds, polyalkoxysilyl compounds, titanates. Examples thereof include compounds, aldehyde compounds, polyvalent metal salt compounds, hydrazine and the like.
- a crosslinking agent can be used individually or in mixture of 2 or more types.
- a particularly preferred crosslinking agent is a water-soluble crosslinking agent, but a water-insoluble crosslinking agent can be used by dispersing in water with a dispersant.
- Preferred combinations of the water-soluble resin and the crosslinking agent include carboxylic acid-containing water-soluble resins / polyvalent metal compounds, carboxylic acid-containing water-soluble resins / water-soluble epoxy resins, and hydroxyl group-containing resins / dialdehydes.
- a suitable addition amount of the crosslinking agent is 2 to 10% of the water-soluble resin. Within this range, good handleability can be obtained without impairing the removability of the overcoat layer on the printing press.
- the protective layer may contain known additives such as a plasticizer for imparting flexibility, a surfactant for improving coating properties, and inorganic fine particles for controlling surface slipperiness. Further, the protective layer can contain the sensitizer described in the description of the image recording layer.
- the protective layer is applied by a known method.
- the coating amount of the protective layer is a coating amount after drying is preferably 0.01 ⁇ 10g / m 2, more preferably 0.02 ⁇ 3g / m 2, particularly preferably 0.02 ⁇ 1g / m 2.
- the plate making method of the lithographic printing plate precursor according to the invention will be described below.
- the lithographic printing plate precursor according to the invention is subjected to image development and developed on a printing machine to be used for printing.
- Image exposure is performed by laser exposure through a transparent original having a line image, a halftone dot image, or the like, or by laser light scanning using digital data.
- the wavelength of the light source is preferably 700 to 1400 nm.
- a solid-state laser and a semiconductor laser that emit infrared rays are suitable.
- the output is preferably 100 mW or more
- the exposure time per pixel is preferably within 20 microseconds
- the irradiation energy amount is preferably 10 to 300 mJ / cm 2 .
- the exposure mechanism may be any of an internal drum system, an external drum system, a flat bed system, and the like. Image exposure can be performed by a conventional method using a plate setter or the like.
- An image-exposed lithographic printing plate precursor is mounted on the impression cylinder of a printing press, and thereafter developed on-press by a normal printing start operation for supplying dampening water and ink, and can be subsequently printed.
- the lithographic printing plate precursor is mounted on the plate cylinder of the printing press, then exposed by the exposure device of the printing press, and subsequently developed on the press for printing. it can.
- a plate making method in which the lithographic printing plate precursor is image-exposed with an infrared laser and then the unexposed portion of the image recording layer is removed on the printing machine using at least one of printing ink and fountain solution is preferable.
- the molecular weight is a mass average molar mass (Mw), and the ratio of repeating units is a mole percentage, except for those specifically defined.
- An aluminum plate having a thickness of 0.19 mm was degreased by immersing it in a 40 g / l sodium hydroxide aqueous solution at 60 ° C. for 8 seconds and washed with demineralized water for 2 seconds.
- the aluminum plate is then placed in an aqueous solution containing 12 g / l hydrochloric acid and 38 g / l aluminum sulfate (18 hydrate) using an alternating current for 15 seconds at a temperature of 33 ° C. and a current density of 130 A / dm 2.
- An electrochemical roughening treatment was performed.
- the aluminum plate was desmutted by etching with 155 g / l sulfuric acid aqueous solution at 70 ° C. for 4 seconds, and washed with demineralized water at 25 ° C. for 2 seconds.
- the aluminum plate was anodized in a 155 g / l sulfuric acid aqueous solution for 13 seconds at a temperature of 45 ° C. and a current density of 22 A / dm 2 and washed with demineralized water for 2 seconds. Further, it was post-treated with a 4 g / l aqueous polyvinylphosphonic acid solution at 40 ° C. for 10 seconds, washed with desalted water at 20 ° C. for 2 seconds, and dried.
- the support thus obtained had a surface roughness Ra of 0.21 ⁇ m and an anodized film amount of 4 g / m 2 .
- aqueous coating solution for an image recording layer containing components such as a thermoplastic fine particle polymer, an infrared absorber, and a polyglycerol compound shown in Table 1 below was prepared, adjusted to pH 3.6, and then coated on the support. Then, it was dried at 50 ° C. for 1 minute to form an image recording layer, and a lithographic printing plate precursor was prepared. Table 1 shows the coating amount of each component after drying.
- Thermoplastic fine particle polymer SAN, infrared absorber IR-01, polyglycerol compounds PG-1 to PG-3, POA group or hydroxy group-containing surfactant N-12, and other components used in the image recording layer coating solution PAA and (X) are as shown below.
- the POA group or hydroxy group-containing surfactant those other than N-12 are the surfactants exemplified above.
- Thermoplastic particulate polymer SAN styrene / acrylonitrile copolymer (molar ratio 50/50), Tg: 99 ° C., average particle size: 60 nm
- Polyglycerol compound PG-1 Polyglycerin PGL 10 (number of repeating units: 10) (manufactured by Daicel Corporation)
- Polyglycerol compound PG-2 Polyglycerin PGL 6 (number of repeating units: 6) (manufactured by Daicel Corporation)
- Polyglycerol compound PG-3 Polyglycerin PGL X (number of repeating units: 40) (manufactured by Daicel Corporation)
- N-12 polyether-modified polydimethylsiloxane (trade name, Edaplan LA411, manufactured by Dow Chemical Company)
- PAA polyacrylic acid, weight average molecular weight: 250,000
- thermocondition 1 Evaluation of planographic printing plate precursor
- the prepared lithographic printing plate precursor and interleaf (the interleaf described in Example 1 of JP-A-2003-302749 (corresponding to EP1, 353, 221B1)) were conditioned for 1 hour at 25 ° C. and 50% RH. . After humidity control, 30 sets of slip sheets placed on the lithographic printing plate precursor were stacked, and further packaged with aluminum kraft paper with the top and bottom sandwiched between balls to produce a normal product form.
- the prepared package was stored at 60 ° C. for 4.5 days to prepare a lithographic printing plate precursor that simulates the case where it was stored for a long time under high temperature conditions.
- the prepared lithographic printing plate precursor and interleaf (the interleaf described in Example 1 of JP-A-2003-302749 (corresponding to EP1, 353, 221B1)) were conditioned for 1 hour at 25 ° C. and 85% RH. . After humidity control, 30 sets of slip sheets placed on the lithographic printing plate precursor were stacked, and further packaged with aluminum kraft paper with the top and bottom sandwiched between balls to produce a normal product form. The prepared package was stored at 60 ° C. for 4.5 days to prepare a lithographic printing plate precursor that simulates the case of long-term storage under high temperature and high humidity conditions.
- the lithographic printing plate precursor was exposed with a Luxel PLANETSETTER T-6000III equipped with an infrared semiconductor laser under the conditions of an outer drum rotation speed of 1000 rpm, a laser output of 70%, and a resolution of 2400 dpi.
- the exposure image included a solid image and a 50% halftone dot chart of a 20 ⁇ m dot FM screen.
- the exposed lithographic printing plate precursor was mounted on the plate cylinder of a printing machine LITHRONE 26 manufactured by Komori Corporation without developing.
- the on-machine development on the printing machine of the unexposed part of the image recording layer was completed, and the number of printing sheets required until the ink was not transferred to the non-image part was measured and evaluated as on-machine developability. The results are shown in Table 2.
- Print life Printing was further continued after the on-press developability evaluation. As the number of printed sheets was increased, the image recording layer was gradually worn out, so that the ink density on the printed material decreased. The number of printed copies was measured and evaluated as printing durability when the value measured by the Gretag densitometer for the dot area ratio of the 50% dot on the FM screen in the printed material was 5% lower than the value measured for the 100th printed sheet. The results are shown in Table 2.
- the on-press developability is remarkably improved by incorporating the polyglycerol compound according to the present invention in the image recording layer of the heat-fusing lithographic printing plate precursor (Example 1). ⁇ 5). Further, by using a surfactant containing a polyoxyalkylene group or a hydroxy group in combination, excellent on-press developability is maintained even when stored under high temperature or high temperature and high humidity conditions (Examples 6 to 6). 15). On the other hand, when the image recording layer does not contain a polyglycerol compound (Comparative Example 1), the on-press developability is extremely poor.
- a heat fusion type lithographic printing plate precursor having extremely excellent on-press developability while maintaining printing durability can be obtained.
- a heat fusion type lithographic printing plate precursor having excellent storage stability can be obtained.
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Abstract
Description
従来、親水性の支持体上に親油性の感光性樹脂層(画像記録層、画像形成層)を有する平版印刷版原版(PS版)を用い、この平版印刷版原版にリスフィルムなどのマスクを通した画像露光を行った後、アルカリ性現像液などによる現像処理を行い、画像部に対応する画像記録層を残存させ、非画像部に対応する不要な画像記録層を溶解除去して平版印刷版を得ていた。
平版印刷版原版から平版印刷版を作製する製版工程は、簡易化が進み、画像露光に関しては、現在、平版印刷版は、CTP(コンピュータ・トゥ・プレート)技術によって得られるようになっている。すなわち、レーザーやレーザーダイオードを用いて、リスフィルムを介することなく、平版印刷版原版を直接走査露光し、現像処理して平版印刷版が得られる。
機上現像型平版印刷版原版としては、赤外線吸収剤、重合開始剤、重合性化合物を含有する画像記録層を支持体上に有する平版印刷版原版(例えば、特許文献1)及び赤外線吸収剤、熱可塑性ポリマー粒子を含有する画像記録層を支持体上に有する平版印刷版原版(例えば、特許文献2)が知られている。
しかしながら、上記特許文献に記載の技術によっては、耐刷性の改良がある程度認められるが、機上現像性は十分ではない。従って、熱融着型の平版印刷版原版において、優れた機上現像性と十分な耐刷性の提供が求められている。
(1)支持体上に、(A)熱可塑性微粒子ポリマー、(B)赤外線吸収剤、及び(C)ポリグリセロール化合物を含有する画像記録層を有する平版印刷版原版であって、上記ポリグリセロール化合物が下記一般式(1)及び一般式(2)で表される構造単位のいずれかを3つ以上有する化合物である平版印刷版原版。
(2)上記一般式(1)及び一般式(2)で表される構造単位におけるAが、水素原子である上記(1)に記載の平版印刷版原版。
(3)上記画像記録層が、ポリオキシアルキレン基又はヒドロキシ基を有する界面活性剤を含有する上記(1)又は(2)に記載の平版印刷版原版。
(4)上記ポリオキシアルキレン基又はヒドロキシ基を有する界面活性剤が、ポリオキシアルキレン基又はヒドロキシ基を有するアニオン界面活性剤又はノニオン界面活性剤である上記(3)に記載の平版印刷版原版。
(5)上記ポリオキシアルキレン基又はヒドロキシ基を有するアニオン界面活性剤又はノニオン界面活性剤が、ポリオキシアルキレン基を有するアニオン界面活性剤又はノニオン界面活性剤である上記(4)に記載の平版印刷版原版。
(6)上記ポリオキシアルキレン基を有するアニオン界面活性剤又はノニオン界面活性剤が、ポリオキシエチレン基を有するアニオン界面活性剤又はノニオン界面活性剤である上記(5)に記載の平版印刷版原版。
(7)上記(1)~(6)のいずれか一項に記載の平版印刷版原版を、赤外線レーザーにより画像露光した後、印刷機上で印刷インキ及び湿し水の少なくともいずれかを用いて画像記録層未露光部分を除去する製版方法。
本発明の平版印刷版原版は、支持体上に、(A)熱可塑性微粒子ポリマー、(B)赤外線吸収剤、及び(C)ポリグリセロール化合物を含有する画像記録層を有し、上記ポリグリセロール化合物が前記一般式(1)及び一般式(2)で表される構造単位のいずれかを3つ以上有する化合物であることを特徴とする。本発明の平版印刷版原版は、画像露光後、印刷機上における機上現像により平版印刷版を作製することができる。
以下に、本発明の平版印刷版原版について詳細に説明する。
本発明の平版印刷版原版における画像記録層は、(A)熱可塑性微粒子ポリマー、(B)赤外線吸収剤、及び(C)ポリグリセロール化合物を含有する。画像記録層に含有される成分について、以下に説明する。
本発明の平版印刷版原版の画像記録層に含まれる熱可塑性微粒子ポリマーはそのガラス転移温度(Tg)が60℃~250℃であることが好ましい。熱可塑性微粒子ポリマーのTgは、70℃~140℃がより好ましく、80℃~120℃が更に好ましい。
Tgが60℃以上の熱可塑性微粒子ポリマーとしては、例えば、1992年1月のReseachDisclosure No.33303、特開平9-123387号公報、同9-131850号公報、同9-171249号公報、同9-171250号公報及びEP931647号公報などに記載の熱可塑性微粒子ポリマーを好適なものとして挙げることができる。
具体的には、エチレン、スチレン、塩化ビニル、アクリル酸メチル、アクリル酸エチル、メタクリル酸メチル、メタクリル酸エチル、塩化ビニリデン、アクリロニトリル、ビニルカルバゾールなどのモノマーから構成されるホモポリマー若しくはコポリマー又はそれらの混合物などを例示することができる。好ましくは、スチレン、アクリロニトリル、又は(メタ)アクリル酸メチルから構成されるホモポリマー若しくはコポリマー又はそれらの混合物であり、より好ましくはスチレン又はアクリロニトリルから構成されるホモポリマー若しくはコポリマー又はそれらの混合物である。
例えば、熱可塑性微粒子ポリマーとして粒子サイズが同じものを用いた場合には、熱可塑性微粒子ポリマー間にある程度の空隙が存在することになり、画像露光により熱可塑性微粒子ポリマーを溶融固化させても皮膜の硬化性が所望のものにならないことがある。これに対して、熱可塑性微粒子ポリマーとして粒子サイズが異なるものを用いた場合、熱可塑性微粒子ポリマー間にある空隙率を低くすることができ、その結果、画像露光後の画像部の皮膜硬化性を向上させることができる。
架橋性基の導入を微粒子ポリマーの重合後に行う場合に用いる高分子反応としては、例えば、WO96/34316号に記載されている高分子反応を挙げることができる。
熱可塑性微粒子ポリマーは、架橋性基を介して微粒子ポリマー同士が反応してもよいし、画像記録層に添加された高分子化合物あるいは低分子化合物と反応してもよい。
本発明の平版印刷版原版の画像記録層に含まれる赤外線吸収剤は、好ましくは760~1200nm吸収極大を有する染料又は顔料である。染料がより好ましい。
以下に赤外線吸収染料の具体例を示すが、本発明はこれらに限定されるものではない。
本発明に係る平版印刷版原版の画像記録層に含まれるポリグリセロール化合物は、下記一般式(1)及び一般式(2)で表される構造単位のいずれかを3つ以上有する化合物である。
また、市販品も利用でき、例えば、ポリグリセリン #310、ポリグリセリン #500、ポリグリセリン #750(以上、阪本薬品工業(株)製)、ポリグリセリン(四日市合成(株)製)、ポリグリセリン PGL 06、ポリグリセリン PGL 10、ポリグリセリン PGL X(以上、(株)ダイセル製)などが挙げられる。
本発明の画像記録層に含有されるポリオキシアルキレン基(以下、POA基とも記載する)又はヒドロキシ基を有する界面活性剤としては、POA基又はヒドロキシ基を有する界面活性剤を適宜用いることができるが、アニオン界面活性剤又はノニオン界面活性剤が好ましい。POA基又はヒドロキシ基を有するアニオン界面活性剤又はノニオン界面活性剤界面活性剤の中で、POA基を有するアニオン界面活性剤又はノニオン界面活性剤が好ましい。
オキシアルキレン基の平均重合度は通常2~50が適当であり、好ましくは2~20である。
ヒドロキシ基の数は通常1~10が適当であり、好ましくは2~8である。但し、オキシアルキレン基における末端ヒドロキシ基は、ヒドロキシ基の数には含めない。
POA基を有するアニオン界面活性剤としては、特に限定されず、ポリオキシアルキレンアルキルエーテルカルボン酸塩類、ポリオキシアルキレンアルキルスルホコハク酸塩類、ポリオキシアルキレンアルキルエーテル硫酸エステル塩類、アルキルフェノキシポリオキシアルキレンプロピルスルホン酸塩類、ポリオキシアルキレンアルキルスルホフェニルエーテル類、ポリオキシアルキレンアリールエーテル硫酸エステル塩類、ポリオキシアルキレン多環フェニルエーテル硫酸エステル塩類、ポリオキシアルキレンスチリルフェニルエーテル硫酸エステル塩類、ポリオキシアルキレンアルキルエーテル燐酸エステル塩類、ポリオキシアルキレンアルキルフェニルエーテル燐酸エステル塩類、ポリオキシアルキレンパーフルオロアルキルエーテル燐酸エステル塩類等が挙げられる。
ヒドロキシ基を有するアニオン界面活性剤としては、特に限定されず、ヒドロキシカルボン酸塩類、ヒドロキシアルキルエーテルカルボン酸塩類、ヒドロキシアルカンスルホン酸塩類、脂肪酸モノグリセリド硫酸エステル塩類、脂肪酸モノグリセリドリン酸エステル塩類等が挙げられる。
R1-Y1-X1 一般式(S1)
一般式(S1)中、R1は、アルキル基又はアリール基を表わす。Y1は、単結合、又はアルキレン基、ポリオキシアルキレン基、アリーレン基、-O-、-NH-、カルボニル基若しくはこれらの基を2つ以上組み合わせた2価の連結基を表す。X1は、酸基又はその塩を表す。但し、R1及びY1の少なくともいずれかは、少なくとも1つのポリオキシアルキレン基又はヒドロキシ基を含む。
R1で表されるアリール基は、炭素数6~30のアリール基が好ましく、炭素数6~10のアリール基がより好ましい。アリール基の具体例としては、フェニル基、ナフチル基、インデニル基、アントラニル基等が挙げられる。
R1で表されるアルキレン基又はアリーレン基は置換基を有していてもよい。
Y1で表されるアリーレン基としては、炭素数6~30のアリーレン基が好ましく、炭素数6~10のアリーレン基がより好ましい。
Y1で表されるアルキレン基又はアリーレン基は置換基を有していてもよい。
上記置換基の中で、水素原子を有するものは、これを取り去り更に上記の置換基で置換されていても良い。
POA基を有するノニオン界面活性剤としては、特に限定されず、ポリオキシアルキレンアルキルエーテル類、ポリオキシアルキレングリセリルエーテル脂肪酸エステル、ポリオキシアルキレンアルキルフェニルエーテル類、ポリオキシアルキレンアルキルナフチルエーテル類、ポリオキシエチレンポリオキシプロピレングリコール類、ポリオキシアルキレン脂肪酸エステル類、ポリオキシアルキレンソルビタン脂肪酸エステル類、脂肪酸ポリオキシアルキレンソルビット類、ポリオキシアルキレン硬化ヒマシ油、ポリエーテル変性シリコーンオイル類、グリセリン脂肪酸エステル類、ソルビタン脂肪酸エステル類、ショ糖脂肪酸エステル類、アルキルグリセリルエーテル、アルキルグリコシド類、ポリオキシアルキレンパーフルオロアルキルエーテル等が挙げられる。
ヒドロキシ基を有するノニオン界面活性剤としては、特に限定されず、グリセリン脂肪酸エステル類、ソルビタン脂肪酸エステル類、ショ糖脂肪酸エステル類、アルキルグリセリルエーテル、ポリオキシアルキレンソルビタン脂肪酸エステル類、脂肪酸アルカノールアミド類、アルキルグリコシド類、フッ素テロマーアルコール類、ポリエーテル変性シリコーンオイル類等が挙げられる。
R21-Y2-R22 一般式(S2)
一般式(S2)中、R21は、アルキル基、アリール基又は環状エーテル基を表わす。Y2は、単結合、又はアルキレン基、ポリオキシアルキレン基、アリーレン基、-O-、-NH-、カルボニル基若しくはこれらの基を2つ以上組み合わせた2価の連結基を表す。R22は、水素原子又はヒドロキシ基を表す。但し、一般式(S2)で表される界面活性剤には、少なくとも1つのポリオキシアルキレン基又はヒドロキシ基を有する。
R21で表される環状エーテル基は、炭素数2~6の環状エーテル基が好ましく、炭素数5~6の環状エーテル基がより好ましい。環状エーテル基の具体例としては、オキセタニル基、テトラヒドロフラニル基、テトラヒドロピラニル基等が挙げられる。
Y2で表されるアリーレン基としては、炭素数6~30のアリーレン基が好ましく、炭素数6~10のアリーレン基がより好ましい。
Y2で表される、アルキレン基又はアリーレン基は、置換基を有していてもよい。
当該アニオン界面活性剤は、上記目的を達成する限り、特に制限されない。中でも、アルキルベンゼンスルホン酸又はその塩、アルキルナフタレンスルホン酸又はその塩、(ジ)アルキルジフェニルエーテル(ジ)スルホン酸又はその塩、アルキル硫酸エステル塩が好ましい。
無機微粒子の含有量は、画像記録層固形分の1.0~70質量%が好ましく、5.0~50質量%がより好ましい。
可塑剤の含有量は、画像記録層固形分の0.1%~50質量%が好ましく、1~30質量%がより好ましい。
本発明の画像記録層は、必要な上記各成分を適当な溶剤に溶解又は分散して塗布液を調製し、支持体に塗布して形成される。溶剤としては、水又は水と有機溶剤との混合溶剤が用いられるが、水と有機溶剤の混合使用が、塗布後の面状を良好にする点で好ましい。有機溶剤の量は、有機溶剤の種類によって異なるので、一概に特定できないが、通常混合溶剤中5~50容量%が好ましい。但し、有機溶剤は熱可塑性微粒子ポリマーが凝集しない範囲の量で使用する必要がある。画像記録層用塗布液の固形分濃度は、好ましくは1~50質量%である。
本発明の平版印刷版原版に用いる支持体は、親水性表面を有する基板又は親水層の塗布などによって親水性表面を付与された基板である。具体的には、紙、プラスチック(例えば、ポリエチレン、ポリプロピレン、ポリスチレン等)がラミネートされた紙、金属板(例えば、アルミニウム、亜鉛、銅等)、プラスチックフィルム(例えば、二酢酸セルロース、三酢酸セルロース、プロピオン酸セルロース、酪酸セルロース、酢酸酪酸セルロース、硝酸セルロース、ポリエチレンテレフタレート、ポリエチレン、ポリスチレン、ポリプロピレン、ポリカーボネート、ポリビニルアセタール等)、上記金属がラミネート又は蒸着された紙又はプラスチックフィルム、又はこれら基板に親水層を塗布された基板が挙げられる。好ましい支持体としては、アルミニウム板及び親水層を塗布されたポリエステルフィルムが挙げられる。
本発明の平版印刷版原版は、画像記録層の上に保護層(オーバーコート層)を設けることができる。保護層は、保存時の親油性物質による汚染や取り扱い時の手指の接触による指紋跡汚染等から親水性の画像記録層表面を保護する機能、画像記録層における傷の発生防止、及び高照度レーザー露光時のアブレーション防止の機能、酸素遮断によって画像形成阻害反応を抑制する機能などを有する。
オーバーコート層は印刷機上で容易に除去できるものであり、水溶性ポリマー及び水溶性ポリマーを部分的に架橋した水膨潤性ポリマーのいずれをも適宜選択して使用することができ、必要に応じて2種類以上を混合して使用することもできる。
水溶性ポリマーは、水溶性の天然高分子及び合成高分子から選ばれ、水溶性ポリマー単独若しくは架橋剤と共に用いて、塗布乾燥後の皮膜がフィルム形成能を有するものである。
架橋により、オーバーコート層表面の粘着性が低下して平版印刷版原版の取り扱い性がよくなるが、架橋が進み過ぎるとオーバーコート層が親油性に変化して、印刷機上におけるオーバーコート層の除去が困難になる傾向があるので、適度な部分架橋が好ましい。好ましい部分架橋の程度は、25℃の水中に平版印刷版原板を浸したときに、30秒~10分間ではオーバーコート層が溶出せず残存しているが、10分以上ではオーバーコート層の溶出が認められる程度である。
架橋反応に用いられる化合物(架橋剤)としては、架橋性を有する公知の多官能性化合物が挙げられ、具体的には、ポリエポキシ化合物、ポリアミン化合物、ポリイソシアナート化合物、ポリアルコキシシリル化合物、チタネート化合物、アルデヒド化合物、多価金属塩化合物、ヒドラジン等が挙げられる。
水溶性樹脂と架橋剤の好ましい組み合わせとしては、カルボン酸含有水溶性樹脂/多価金属化合物、カルボン酸含有水溶性樹脂/水溶性エポキシ樹脂、水酸基含有樹脂/ジアルデヒド類が挙げられる。
架橋剤の好適な添加量は、水溶性樹脂の2~10%である。この範囲内で印刷機上でのオーバーコート層の除去性を損なうことなく、良好な取り扱い性が得られる。
本発明の平版印刷版原版の製版方法について、以下に説明する。
本発明の平版印刷版原版は、画像露光後、印刷機上で現像することにより製版され、印刷に用いられる。
印刷機に露光装置が搭載されている場合には、平版印刷版原版を印刷機の版胴上に取りつけた後に、印刷機の露光装置により露光し、続いて機上現像し、印刷することができる。
〔平版印刷版原版の作製〕
厚さ0.19mmのアルミニウム板を40g/lの水酸化ナトリウム水溶液中に60℃で8秒間浸漬することにより脱脂し、脱塩水により2秒間洗浄した。次に、アルミニウム板を15秒間交流を用いて12g/lの塩酸及び38g/lの硫酸アルミニウム(18水和物)を含有する水溶液中で、33℃の温度及び130A/dm2の電流密度で電気化学的粗面化処理を行った。脱塩水により2秒間洗浄した後、アルミニウム板を155g/lの硫酸水溶液により70℃で4秒間エッチングすることによりデスマット処理し、脱塩水により25℃で2秒間洗浄した。アルミニウム板を13秒間155g/lの硫酸水溶液中で、45℃の温度及び22A/dm2の電流密度で陽極酸化処理し、脱塩水で2秒間洗浄した。更に、4g/lのポリビニルホスホン酸水溶液を用いて40℃で10秒間後処理し、脱塩水により20℃で2秒間洗浄し、乾燥した。このようにして得られた支持体は、表面粗さRaが0.21μmで、陽極酸化皮膜量は4g/m2であった。
下記表1に示す熱可塑性微粒子ポリマー、赤外線吸収剤、ポリグリセロール化合物などの成分を含有する画像記録層用水系塗布液を調製し、pHを3.6に調整した後、上記支持体上に塗布し、50℃で1分間乾燥して画像記録層を形成し、平版印刷版原版を作製した。各成分の乾燥後の塗布量を表1に示す。
ポリグリセロール化合物PG-1:ポリグリセリン PGL 10(繰り返し単位数:10)((株)ダイセル社製)
ポリグリセロール化合物PG-2:ポリグリセリン PGL 6(繰り返し単位数:6)((株)ダイセル社製)
ポリグリセロール化合物PG-3:ポリグリセリン PGL X(繰り返し単位数:40)((株)ダイセル社製)
POA基又はヒドロキシ基含有界面活性剤N-12:ポリエーテル変性ポリジメチルシロキサン(商品名 エダプランLA411 ダウ・ケミカル・カンパニー製)
他の成分PAA:ポリアクリル酸、質量平均分子量:250,000
他の成分(X):デカグリセリンモノラウレート(商品名 ポエム J-0021 理研ビタミン(株)製)
赤外線吸収剤IR-01:下記構造の赤外線吸収剤
各平版印刷版原版について、機上現像性及び耐刷性を以下のように評価した。評価は作製直後の平版印刷版原版並びに下記サーモ条件1及びサーモ条件2に従って強制経時させた平版印刷版原版を用いて行った。
作製した平版印刷版原版及び合紙(特開2003-302749号(EP1、353、221B1に対応)の実施例1に記載の合紙)を、25℃50%RH条件下で1時間調湿した。調湿後、平版印刷版原版上に合紙を載せたセットを30セット積み重ね、更に上下を当てボールで挟んだ状態でアルミクラフト紙で包装し、通常の製品形態を作製した。作製した包装体を60℃で4.5日間保管することにより、高温条件で長期間保存した場合をシミュレーションした平版印刷版原版を作製した。
作製した平版印刷版原版及び合紙(特開2003-302749号(EP1、353、221B1に対応)の実施例1に記載の合紙)を、25℃85%RH条件下で1時間調湿した。調湿後、平版印刷版原版上に合紙を載せたセットを30セット積み重ね、更に上下を当てボールで挟んだ状態でアルミクラフト紙で包装し、通常の製品形態を作製した。作製した包装体を60℃で4.5日間保管することにより、高温高湿条件で長期間保存した場合をシミュレーションした平版印刷版原版を作製した。
平版印刷版原版を赤外線半導体レーザー搭載の富士フイルム(株)製Luxel PLATESETTER T-6000IIIにて、外面ドラム回転数1000rpm、レーザー出力70%、解像度2400dpiの条件で露光した。露光画像にはベタ画像及び20μmドットFMスクリーンの50%網点チャートを含むようにした。
露光後の平版印刷版原版を現像処理することなく、(株)小森コーポレーション製印刷機LITHRONE26の版胴に取り付けた。Ecolity-2(富士フイルム(株)製)/水道水=2/98(容量比)の湿し水とスペースカラーフュージョンG(N)インキ(DICグラフィックス(株)製)とを用い、LITHRONE26の標準自動印刷スタート方法で湿し水とインキとを供給して機上現像し、毎時10000枚の印刷速度で、特菱アート(76.5kg)紙に印刷を100枚行った。
画像記録層の未露光部の印刷機上での機上現像が完了し、非画像部にインキが転写しない状態になるまでに要した印刷用紙の枚数を計測し機上現像性として評価した。結果を表2に示す。
上記機上現像性評価を行った後、更に印刷を続けた。印刷枚数を増やしていくと徐々に画像記録層が磨耗するため印刷物上のインキ濃度が低下した。印刷物におけるFMスクリーン50%網点の網点面積率をグレタグ濃度計で計測した値が印刷100枚目の計測値よりも5%低下したときの印刷部数を計測し耐刷性として評価した。結果を表2に示す。
これに対して、画像記録層がポリグリセロール化合物を含有しない場合(比較例1)には、機上現像性が極めて劣る。また、ポリアクリル酸のような公知の水溶性樹脂を含有する場合(比較例2)、あるいは、デカグリセリンモノラウレートのような長鎖アルキル基を有するポリグリセリンエステルを含有する場合(比較例3)には機上現像性が大幅に劣る。
更に、画像記録層がポリグリセロール化合物を含有せず、ポリオキシアルキレン基又はヒドロキシ基を含有する界面活性剤のみを含有する場合(比較例4)にも機上現像性が大幅に劣る。
以上のことから、本発明に係るポリグリセロール化合物が熱融着型平版印刷版原版の機上現像性の向上に特異的に有効であることが理解される。
本出願は、2013年7月18日出願の日本特許出願(特願2013-149861)に基づくものであり、その内容はここに参照として取り込まれる。
Claims (7)
- 上記一般式(1)及び一般式(2)で表される構造単位におけるAが、水素原子である請求項1に記載の平版印刷版原版。
- 上記画像記録層が、ポリオキシアルキレン基又はヒドロキシ基を有する界面活性剤を含有する請求項1又は2に記載の平版印刷版原版。
- 上記ポリオキシアルキレン基又はヒドロキシ基を有する界面活性剤が、ポリオキシアルキレン基又はヒドロキシ基を有するアニオン界面活性剤又はノニオン界面活性剤である請求項3に記載の平版印刷版原版。
- 上記ポリオキシアルキレン基又はヒドロキシ基を有するアニオン界面活性剤又はノニオン界面活性剤が、ポリオキシアルキレン基を有するアニオン界面活性剤又はノニオン界面活性剤である請求項4に記載の平版印刷版原版。
- 上記ポリオキシアルキレン基を有するアニオン界面活性剤又はノニオン界面活性剤が、ポリオキシエチレン基を有するアニオン界面活性剤又はノニオン界面活性剤である請求項5に記載の平版印刷版原版。
- 請求項1~6のいずれか一項に記載の平版印刷版原版を、赤外線レーザーにより画像露光した後、印刷機上で印刷インキ及び湿し水の少なくともいずれかを用いて画像記録層未露光部分を除去する製版方法。
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DE112014003300.6T DE112014003300T5 (de) | 2013-07-18 | 2014-06-27 | Lithographischer Druckplattenvorläufer und Verfahren zu dessen Erzeugung |
CN201480040752.9A CN105392634B (zh) | 2013-07-18 | 2014-06-27 | 平版印刷版原版及其制版方法 |
US15/000,335 US20160144648A1 (en) | 2013-07-18 | 2016-01-19 | Lithographic printing plate precursor and method for producing same |
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JP2002287334A (ja) * | 2001-03-26 | 2002-10-03 | Fuji Photo Film Co Ltd | 平版印刷版原版及び平版印刷方法 |
WO2007072689A1 (ja) * | 2005-12-19 | 2007-06-28 | Konica Minolta Medical & Graphic, Inc. | エチレン性不飽和結合含有化合物、感光性組成物、感光性平版印刷版材料、及びそれを用いた印刷方法 |
JP2008544322A (ja) * | 2005-06-21 | 2008-12-04 | アグフア・グラフイクス・ナームローゼ・フエンノートシヤツプ | 感熱性像形成要素 |
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DE60119824T3 (de) * | 2000-04-07 | 2012-05-31 | Fujifilm Corp. | Wärmeempfindlicher lithographischer Druckplattevorläufer |
CN1171122C (zh) * | 2000-12-12 | 2004-10-13 | 富士胶片株式会社 | 光聚合性组合物 |
JP4340601B2 (ja) * | 2004-08-16 | 2009-10-07 | 富士フイルム株式会社 | 平版印刷版原版 |
US20070067571A1 (en) * | 2005-09-19 | 2007-03-22 | Claus Pribbernow | Superior cache processor landing zone to support multiple processors |
US8221960B2 (en) * | 2009-06-03 | 2012-07-17 | Eastman Kodak Company | On-press development of imaged elements |
CN102346374A (zh) * | 2010-07-30 | 2012-02-08 | 富士胶片株式会社 | 图像形成材料、平版印刷版原版及平版印刷版的制作方法 |
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JP2002287334A (ja) * | 2001-03-26 | 2002-10-03 | Fuji Photo Film Co Ltd | 平版印刷版原版及び平版印刷方法 |
JP2008544322A (ja) * | 2005-06-21 | 2008-12-04 | アグフア・グラフイクス・ナームローゼ・フエンノートシヤツプ | 感熱性像形成要素 |
WO2007072689A1 (ja) * | 2005-12-19 | 2007-06-28 | Konica Minolta Medical & Graphic, Inc. | エチレン性不飽和結合含有化合物、感光性組成物、感光性平版印刷版材料、及びそれを用いた印刷方法 |
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