WO2020017326A1

WO2020017326A1 - Resin intaglio printing plate, method for manufacturing same, and printing method

Info

Publication number: WO2020017326A1
Application number: PCT/JP2019/026415
Authority: WO
Inventors: 出田康平; 油努
Original assignee: 東レ株式会社
Priority date: 2018-07-18
Filing date: 2019-07-03
Publication date: 2020-01-23
Also published as: JPWO2020017326A1; TW202013074A

Abstract

The present invention addresses the problem of providing a resin intaglio printing plate that enables attaining a printed matter having good linearity at the edge of an image portion, and a method for manufacturing the resin intaglio printing plate. This resin intaglio printing plate has an image portion including dots formed on the surface of the printing plate, wherein the minimum distance between the edge of the image portion and a dot closest to the edge of the image portion is 20-300 µm.

Description

Resin intaglio printing plate, manufacturing method and printing method

The present invention relates to a resin intaglio printing plate.

In pad printing using an intaglio printing plate, ink is placed on the plate surface and scraped with a metal doctor blade, or placed in a ring-shaped ink cup with a ceramic or special metal edge serving as a doctor blade. By filling the ink and scraping the plate surface with an ink cup, the ink is filled into the concave portions of the intaglio printing plate, the ink is transferred to a flexible pad surface such as silicone rubber, and the ink-attached surface of the pad is printed. This is a type of offset printing that prints by crimping on the body. Intaglio printing plates are also used for gravure printing. (For example, Patent Document 1).

Usually, in the intaglio printing plate, the depth and shape of the concave portion greatly affect the appearance of the printed matter. Adjusting the depth of the recesses, the positive original film was brought into close contact with the photosensitive resin printing plate precursor, and after irradiating with ultraviolet rays, the halftone screen film was brought into close contact and irradiating with ultraviolet rays to form halftone dots in the recesses. Generally, the depth of the concave portion is adjusted so as to be appropriate.

JP-A-5-165200

By the way, when the depth of the concave portion is adjusted by the method using the halftone screen, the halftone dot of the halftone screen overlaps with the edge of the image portion of the original film with a certain probability, thereby causing the linearity of the edge of the image portion. The problem that worsens occurred.

Therefore, an object of the present invention is to provide a resin intaglio printing plate and a method of manufacturing the resin intaglio printing plate, which can obtain a printed material having excellent linearity at the edge of an image portion.

The present invention is a resin intaglio printing plate in which an image portion having a halftone dot is formed on the surface of the plate material, wherein the minimum distance between the edge of the image portion and the halftone dot located closest to the edge of the image portion is 20 μm. It is a resin intaglio printing plate having a thickness of not less than 300 μm.
Further, the present invention is a method for producing a resin intaglio printing plate, in which an exposure step and a development step are performed on a photosensitive resin printing plate precursor in this order, wherein the exposure step comprises the steps of: It is a method for producing a resin intaglio printing plate, including a step of using an original film having points.
The present invention also relates to a printing method for printing using a resin intaglio printing plate in which an image portion having a halftone dot is formed on the surface of the plate material, except for a region having a distance from the image portion edge of 20 μm or less. Forming a halftone dot in the area, filling the image portion with a recording material, transferring the recording material filled in the image portion to a transfer body, and transferring the image material to the transfer body. And a second transfer step of transferring the recorded recording material to a printing material to form a printing material.

により By using the resin intaglio printing plate according to the present invention, it is possible to provide a printed matter having excellent linearity at the edge of the image area.

FIG. 4 is a schematic diagram showing a minimum distance between an image portion end and a halftone dot located closest to the image portion end; Photograph of the end of the image portion of the printed matter.

Hereinafter, embodiments of the present invention will be described.

において In the present invention, the image portion end portion refers to the outermost portion of the image portion formed on the resin intaglio printing plate. Specifically, as shown in FIG. 1, it is a boundary between the image part 4 and the non-image part 3.

樹脂 In the resin intaglio printing plate according to the present invention, the minimum distance between the edge of the image portion and the halftone dot located closest to the edge of the image portion needs to be 20 μm or more and 300 μm or less. The minimum distance is measured using a digital microscope “VHX-2000” (manufactured by Keyence Corporation), which is an optical microscope, under the conditions of a lens Z250 and a magnification of 250 times. The halftone dot located closest to the end of the image portion, that is, the halftone dot closest to the boundary between the image portion 4 and the non-image portion 3 is one of the halftone dots projected on the screen when measured by the optical microscope. This means a halftone dot having the smallest distance between the end of the image part (the boundary line between the image part 4 and the non-image part 3) and the halftone dot. Here, the minimum distance between the end of the image portion and the halftone dot is a distance d of a straight line PQ connecting the point P on the circumference of the halftone dot 1 shown in FIG. is there. Specifically, a tangent 2 to a point P on the circumference of the halftone dot 1 is drawn, and the angle between the straight line PQ and the tangent to the point P is 90 °, and the angle between the straight line PQ and the end of the image portion is It can be obtained by measuring the distance of the straight line PQ at 90 °.

That is, in the present invention, a halftone dot does not exist in an area within 20 μm from the end of the image part, and a halftone dot always exists in an area within 300 μm or more from the end of the image part. Further, the distance to an adjacent, that is, the closest halftone dot is preferably from 60 μm to 170 μm.

The minimum distance d between the edge of the image portion and the halftone dot located closest to the edge of the image portion is preferably 20 μm or more, and more preferably 30 μm or more, from the viewpoint of improving the linearity of the image portion edge. And more preferably 40 μm or more. Further, from the viewpoint of changing the depth of the image portion and adjusting the amount of ink at the time of printing, the minimum distance d is preferably 300 μm or less, more preferably 150 μm or less, and still more preferably 80 μm or less.

The halftone dot present in the image portion has a diameter of preferably 5.0 μm or more, more preferably 10 μm or more, from the viewpoint that the depth of the image portion can be changed and the amount of ink during printing can be adjusted. It is. The diameter of the halftone dot is preferably 50 μm or less, and more preferably 40 μm or less, from the viewpoint of improving the linearity of the edge of the image portion.
The height difference between the surface of the printing plate provided on the image portion of the resin intaglio printing plate and the deepest portion of the concave portion provided between the halftone dots among the concave portions provided on the printing plate surface is 10 to 40 μm. Is preferred. Here, the deepest part is defined as the deepest part in a part excluding the image end part in the image part. When the thickness is 10 μm or more, the transferred amount of the ink becomes a sufficient density, and a printed matter with good linearity without blurring can be obtained when printed. When the thickness is 40 μm or less, the linearity due to the blurring of the printed matter can be obtained. Deterioration can be prevented. The height difference between the surface of the printing plate and the deepest part of the concave portion is measured by observing at a magnification of 20 times using a laser microscope “VK-X250” (manufactured by Keyence Corporation). The height difference can be adjusted by the ultraviolet irradiation time, the dot diameter of the positive film, the dot area ratio, and the like.

The binder polymer contained in the photosensitive resin composition constituting the resin intaglio printing plate of the present invention is (A) a polyamide having an aliphatic ring in the molecular main chain, or a polyamide having a skeleton represented by the general formula (1). It is preferable to use at least one or more polyamides (hereinafter, referred to as “polyamide (A)”) selected from polyamides having a methylene chain having 8 or more carbon atoms in order to maintain a solid state form. Has a function as a carrier resin. The polyamide (A) is used for imparting developability to a photosensitive resin layer with a solution containing a lower alcohol. Further, another polymer can be used in combination as the binder polymer.

Since the polyamide (A) is insoluble in water, the printing plate obtained from the photosensitive resin composition containing the polyamide (A) is not affected by water even when used in a high-humidity environment. Has wear resistance.

The polyamide (A) preferably has a number average molecular weight of 10,000 to 1,000,000. When it is 10,000 or more, the photosensitive resin composition has a function as a carrier resin for maintaining a form in a solid state, and when it is 1,000,000 or less, the photosensitive resin layer When the film is exposed to ultraviolet light like an image and selectively cured, and the uncured portion is removed by development, it can be quickly removed with a developer containing a lower alcohol. The lower alcohol refers to an alcohol having 5 or less carbon atoms in the molecule. The number average molecular weight of the polyamide (A) is more preferably 2,000 or more, further preferably 30,000 or more, further preferably 1,000,000 or less, and still more preferably 200,000 or less. In the present specification, the number average molecular weight of the polyamide (A) can be a polystyrene equivalent number average molecular weight measured by gel permeation chromatography (GPC).

The content of the polyamide (A) is preferably 20 to 80% by mass of the photosensitive resin composition. When the content is 20% by mass or more, the photosensitive resin composition from which the solvent has been removed can be kept in a solid state to maintain the form. When the content is 80% by mass or less, formation of a relief image becomes easy. The content of the polyamide (A) is more preferably 20% by mass or more, and further preferably 30% by mass or more. Further, the content of the polyamide (A) is more preferably 80% by mass or less, and further preferably 70% by mass or less.

In the polyamide (A), the polyamide having an aliphatic ring in the molecular main chain can be obtained by co-condensation of a diamine and / or dicarboxylic acid having an aliphatic ring and a derivative thereof when polymerizing the polyamide. . Examples of the aliphatic ring include alicyclic compounds such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, and cyclooctane. The polyamide (A) has divalent residues of these alicyclic compounds in the molecular main chain. Above all, a residue of cyclohexane is preferable, and for example, a polyamide (A) having a 4,4'-diaminodicyclohexylmethane adipate skeleton residue is preferable.

ポリアミド As such a polyamide, for example, a polycondensate containing at least 4,4'-diaminodicyclohexylmethane adipate is known. Also, a copolycondensate of 4,4'-diaminodicyclohexylmethane adipate with ε-caprolactam and hexamethylene diammonium adipate as shown in Patent Document 1 is known. These aliphatic ring-containing monomer components are present in an amount of 10 to 10 mol% based on the total polyamide components, ie, aminocarboxylic acid units (including lactams as raw materials), dicarboxylic acid units, and diamine units. It is preferably 100 mol%, more preferably 10 to 80 mol%. When the content of these aliphatic ring-containing monomer components is 10 mol% or more, the solubility in lower alcohols when the photosensitive resin composition is used as a photosensitive resin layer is improved. As a result, when the photosensitive resin layer is imagewise exposed to ultraviolet light, selectively cured, and when the uncured portion is removed by development, it can be quickly removed with a developer containing a lower alcohol. Become. When it is at most 80 mol%, the chemical resistance as a crystalline polymer will be favorably maintained.

Another example of the polyamide (A) has a skeleton represented by the following general formula (1) with or without an aliphatic ring in the molecular main chain.

The polyamide (A) having a skeleton represented by the general formula (1) can be obtained by reacting hydrogen of an amide bond of the polyamide with formaldehyde and methanol, and N-methoxymethylating the amide bond.

It is preferable that 10 to 50% of the amide bond hydrogen in the molecule is methoxymethylated. By setting the methoxymethylation to 10% or more, the solubility in lower alcohol is increased. Therefore, the photosensitive resin layer is exposed to ultraviolet light like an image, selectively cured, and the uncured portion is removed by development. In this case, it can be quickly removed with a developer containing a lower alcohol. Further, by setting the methoxymethylation to 50% or less, the abrasion resistance of the polymer can be maintained. The methoxymethylation of amide bond hydrogen is more preferably at least 10%, further preferably at least 20%. The methoxymethylation is more preferably at most 80%, further preferably at most 70%. The methoxymethylation rate of the hydrogen of the amide bond can be controlled by the addition amounts of formamide and methanol, the reaction temperature and the reaction time.

As such a polyamide, for example, "Toresin" (registered trademark) having a number average molecular weight of 40,000 in which 30% of the amide bond of 6-nylon is modified into a skeleton represented by the above general formula (1) ) @ MF-30 (manufactured by Nagase ChemteX Corporation).

Further, as the polyamide (A), it is also possible to use a mixture of a polyamide having an aliphatic ring in the molecular main chain and a polyamide having a skeleton represented by the general formula (1).

Further, another example of the polyamide (A) is a polyamide having a methylene chain having 8 or more carbon atoms. For example, it is also possible to use a so-called copolymer nylon obtained by copolymerizing a monomer having a methylene chain having 8 or more carbon atoms, such as nylon 610, nylon 11, and nylon 12, with nylon 6, nylon 66. By containing a monomer having a methylene chain having 8 or more carbon atoms in a weight ratio of the monomer in the polyamide of 15 to 60% by weight, the polyamide can be dissolved in a lower alcohol. A methylene chain having 8 or more carbon atoms is preferable because it can be dissolved in a lower alcohol, and a methylene chain having 12 or less carbon atoms is preferable because it is economically advantageous. Examples of such a polyamide having a methylene chain having 8 or more carbon atoms include "Amilan" (registered trademark) CM8000 (manufactured by Toray Industries, Inc.) obtained by copolymerizing nylon 6/66/610/12.

As the polyamide (A), a polyamide having a methylene chain having 8 or more carbon atoms is mixed with a polyamide having an aliphatic ring in the molecular main chain and / or a polyamide having a skeleton represented by the general formula (1). It is also possible.

Specific examples of the (B) ethylenic double bond-containing compound used in the photosensitive resin composition include one having an ethylenic double bond as described in WO2018 / 123773. Compound (B-1) or a polyvalent (meth) acrylate obtained by an addition reaction of an ethylenic double bond with a compound having active hydrogen, an unsaturated epoxy compound and a compound having active hydrogen The compound (B-2) having two or more ethylenic double bonds, such as a polyvalent (meth) acrylate, a polyvalent (meth) acrylamide, and a polyvalent vinyl compound obtained by the reaction, include, but is not limited to, these. It is not something to be done. The photosensitive resin composition contains a compound having an ethylenic double bond.

Specific examples of the ethylenic double bond-containing compound (B) preferably used include the following, but are not limited thereto.

For example, benzyl (meth) acrylate, cyclohexyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, phenoxydiethylene glycol (meth) acrylate, 2- (meth) acryloy Roxyethyl phthalate, neopentyl glycol- (meth) acrylic acid-benzoate, (meth) acryloylmorpholine, styrene and its derivatives, vinylpyridine, N-vinyl-2-pyrrolidone, β- (meth) acryloyloxyethyl Hydrogen phthalate, N-phenylmaleimide and derivatives thereof, N- (meth) acryloxysuccinimide, 2-naphthyl (meth) acrylate, N-phenyl (meth) acrylamide, divinylethylene urea Divinylpropylene urea, vinyl caprolactam, vinyl carbazole, bicyclopentenyl (meth) acrylate, 1-vinylimidazole, 2-methyl-1-vinylimidazole, (2-methyl-ethyldioxolan-4-yl) methyl acrylate, imide acrylate, (2-oxy-1,3-dioxolan-4-yl) methyl (meth) acrylate, 2- (oxydiimidazolidin-1-yl) ethyl (meth) acrylate, 2,2,6,6-tetramethyl- 4-piperidyl acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, isoamyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, Tearyl (meth) acrylate, chloroethyl (meth) acrylate, chloropropyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, methoxytriethylene Glycol (meth) acrylate, methoxydipropylene glycol (meth) acrylate, (meth) acrylamide, diacetone (meth) acrylamide, N, N'-methylenebis (meth) acrylamide, 2,2-dimethylaminoethyl (meth) acrylate, 2 , 2-Diethylaminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylia Compounds having only one ethylenic double bond, such as diethylene glycol, 2-hydroxyethyl (meth) acrylate, di (meth) acrylate of polyethylene glycol such as diethylene glycol di (meth) acrylate, and trimethylolpropane tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, glycerol tri (meth) acrylate, ethylene glycol diglycidyl ether have an ethylenic double bond such as unsaturated carboxylic acid or unsaturated alcohol and active hydrogen An unsaturated epoxy compound such as polyvalent (meth) acrylate or glycidyl (meth) acrylate obtained by an addition reaction of a compound and a compound having active hydrogen such as a carboxylic acid or an amine are obtained by an addition reaction. Compounds having two or more ethylenic double bonds, such as polyvalent (meth) acrylates, polyvalent (meth) acrylamides such as methylenebis (meth) acrylamide, and polyvalent vinyl compounds such as divinylbenzene. .

のうち Among these ethylenic double bond-containing compounds, those having one or more hydroxyl groups are preferred. Such a compound has good compatibility with the polyamide (A), and also has good dispersibility of the inorganic fine particles (D) having a pH of extraction water in the range of 5.5 to 8.5. When it is blended, a uniform composition can be produced. Examples of such (B) ethylenic double bond-containing compound include 2-hydroxy-3-phenoxypropyl (meth) acrylate, [4- (hydroxymethyl) cyclohexyl] methyl (meth) acrylate, and 2-hydroxyethyl (meth) acrylate. ) Acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate, β-hydroxy-β ′-(meth) acryloyloxyethyl phthalate, 3 -Chloro-2-hydroxypropyl (meth) acrylate, glycerol di (meth) acrylate and the like.

Further, (B) an ethylenic double bond-containing compound having two or more hydroxyl groups is more preferable. Such a compound can suppress the swelling of the resin intaglio printing plate due to the organic solvent of the ink used for pad printing by the hydrogen bond of the hydroxyl group. Such compounds include glycerin mono (meth) acrylate and pentaerythritol mono (meth) acrylate, but are not limited to these examples.

含有 The content of the ethylenic double bond-containing compound (B) is preferably from 5 to 200 parts by mass based on 100 parts by mass of the polyamide (A). When the amount is 5 parts by mass or more, when printing using the ink, the printing plate can be used without swelling, and when the amount is 200 parts by mass or less, molding of the photosensitive resin composition is facilitated, which is preferable. . (B) The ethylenic double bond-containing compound is more preferably contained in an amount of preferably at least 10 parts by mass, more preferably at least 20 parts by mass, per 100 parts by mass of the polyamide (A). The content of the compound (B) containing an ethylenic double bond is more preferably 150 parts by mass or less, and further preferably 100 parts by mass or less.

(B) The ethylenic double bond-containing compound preferably contains both an acryloyl group and a methacryloyl group, and the number of methacryloyl groups in the (B) ethylenic double bond-containing compound is larger than the number of acryloyl groups. Is preferred. In general, methacryloyl groups have a lower reaction rate than acryloyl groups. Therefore, when ultraviolet rays are radiated through a positive film, if the number of methacryloyl groups is large, the concave portions of the relief become deeper. The eyes make it easy to adjust the depth of the recess.

As the photopolymerization initiator (C) used in the photosensitive resin composition, any one can be used as long as it can polymerize a polymerizable carbon-carbon unsaturated group by light. Among them, those having a function of generating radicals by self-decomposition or hydrogen abstraction by light absorption are preferably used. (C) Examples of the photopolymerization initiator include benzoin alkyl ethers, benzophenones, anthraquinones, benzyls, acetophenones, and diacetyls.

配合 (C) The amount of the photopolymerization initiator is preferably in the range of 0.1 to 20 parts by mass based on 100 parts by mass of the polyamide (A). When the amount is 0.1 part by mass or more, the formability of the relief image is improved, and when the amount is 20 parts by mass or less, precipitation of the photopolymerization initiator can be suppressed. (C) The compounding amount of the photopolymerization initiator is more preferably 0.5 part by mass or more, and further preferably 1 part by mass or more. The amount of the photopolymerization initiator (C) is more preferably 10 parts by mass or less, and further preferably 8 parts by mass or less.

Further, in the photosensitive resin intaglio printing plate of the present invention, for the purpose of improving the abrasion resistance of the ink on the surface of the plate when squeegeeing with a blade of a pad printing machine with excellent abrasion resistance, the photosensitive resin composition has an inorganic Fine particles (D) may be blended. Preferred inorganic fine particles include inorganic fine particles having an average particle diameter of 0.5 μm or more and 4 μm or less and a sphericity of 0.90 or more.

When the average particle diameter of the inorganic fine particles (D) is 0.5 μm or more, abrasion resistance when the blade of a pad printing machine is used can be secured. Of ink can be scraped off. The average particle diameter of the inorganic fine particles (D) is preferably 0.8 μm or more, more preferably 1.0 μm or more. The average particle size is preferably 4.0 μm or less, and more preferably 3.0 μm or less. Further, when the sphericity of the inorganic fine particles (D) is 0.90 or more, and preferably 0.90 to 1.0, the surface roughness of the printing plate is reduced, and thus the ink scraping property is further improved. Can be achieved. In the present invention, the average particle diameter of the inorganic fine particles (D) is a median diameter measured by a laser diffraction scattering method. The sphericity refers to the arithmetic mean value of 50 inorganic fine particles (D) obtained by observing the shape of 50 inorganic fine particles (D) using a scanning electron microscope, calculating the ratio of the shortest diameter / longest diameter of each inorganic fine particle. Things.

Examples of such inorganic fine particles (D) include inorganic fine particles of a simple metal, inorganic oxide particles, inorganic fine particles of inorganic salts, and inorganic fine particles composed of an organic component and an inorganic component. Among these, from the viewpoint of irradiating the photosensitive resin composition with light and suppressing the scattering of ultraviolet light at the time of photocuring, the organic components (A) polyamide and (B) ethylene which are organic components contained in the photosensitive resin composition are used. Silica particles having a refractive index relatively close to that of the compound having an acidic double bond, (C) a photopolymerization initiator and a surfactant are preferred. Further, from the viewpoint of safe handling, amorphous silica is more preferable. On the other hand, in order to improve the wear resistance when the plate surface is scraped off with a blade, alumina having a Vickers hardness greater than that of silica particles can be used, and silica particles and alumina can be mixed and used.

The method for producing such amorphous silica and alumina having a sphericity of 0.90 or more is not particularly limited, but is disclosed in JP-A-58-145613 and JP-A-2006-36915. As shown, a method of melting silica particles or alumina particles in a flame, and a method of burning silicon powder or metallic aluminum by a VMC (Vaporized Metal Combustion) method as disclosed in JP-A-2006-36915. Etc. are known.

The inorganic fine particles (D) preferably have a specific surface area of 10 m ² / g or less. When it is at most 10 m ² / g, the leveling property of the photosensitive resin composition will be good, and it will be easy to form a flat plate surface. The specific surface area of the inorganic fine particles (D) is more preferably 9 m ² / g or less, and further preferably 8 m ² / g or less. In the present specification, the specific surface area of the inorganic fine particles (D) can be measured based on the method described in JIS Z8830: 2013.

On the other hand, the inorganic fine particles (D) preferably have a maximum particle size of 20.0 μm or less. When the maximum particle size is 20.0 μm or less, ink residue when squeegeeing with a blade of a pad printing machine is reduced. The maximum particle diameter of the inorganic fine particles (D) is more preferably 10.0 μm or less. The maximum particle size was set by passing the inorganic fine particles through a sieve of a corresponding size.

Furthermore, it is preferable that the pH of the inorganic fine particles (D) is in the range of 5.5 to 8.5. Within this range, the dispersibility in other components used in the present invention is good, and the aggregation of the inorganic fine particles is suppressed. More preferably, the pH of the extraction water is in the range of 6.0 to 8.0. In addition, when preparing a photosensitive resin composition used for a resin intaglio printing plate precursor or a pad printing plate precursor, even if the inorganic fine particles (D) settle during storage and aggregate, the electrostatic attractive force is small. It is easy to redisperse by stirring, etc., and is excellent in handleability. The pH of the extraction water of the inorganic fine particles (D) can be measured by mixing the powder of the inorganic fine particles with distilled water at 10% by mass, stirring the mixture for 30 minutes, and measuring the supernatant water with a pH meter. The pH of the inorganic fine particles can be adjusted by causing the activity inhibitor to act on the active hydroxyl groups of the inorganic fine particles. Examples of the activity inhibitor include, but are not limited to, one or more selected from organic phosphine compounds, sulfide compounds, mercaptan compounds, ketone compounds, and amide compounds. These activity inhibitors can be mixed with the inorganic fine particles (D) and heated at a temperature of 90 to 180 ° C. for 4 to 24 hours before use.

When such inorganic fine particles (D) are used, aggregation and re-aggregation of the inorganic fine particles (D) are suppressed when blended with polyamide (A) and (B) a compound having an ethylenic double bond, and pad printing is performed. The ink on the plate surface can be scraped off with the blade of the machine.

The inorganic fine particles (D) are preferably contained in the photosensitive resin composition in an amount of 3% by mass or more in order to impart abrasion resistance, and 70% by mass or less in order to enable formation of the photosensitive resin layer. Is preferred. The content of the inorganic fine particles (D) is more preferably from 8% by mass to 60% by mass, and further preferably from 10% by mass to 30% by mass.

エチレン It is also possible to introduce an ethylenic double bond into the surface of the inorganic fine particles (D) by using a surface modifier. Examples of such a modifier include (3-acryloylpropyl) trimethoxysilane, methacryloylpropyltrimethoxysilane, methacryloylpropyltriethoxysilane, methacryloyloxymethyltriethoxysilane, and methacryloyloxymethyltrimethoxysilane And the like, but not limited thereto. By modifying the surface of the inorganic fine particles (D) with an ethylenic double bond, the dispersibility becomes good when mixed with the polyamide (A) or (B) compound having an ethylenic double bond, thereby suppressing aggregation and reaggregation. be able to.

In the photosensitive resin composition, compatibility, ethylene glycol, diethylene glycol, triethylene glycol, glycerin and its derivatives, trimethylolpropane and its derivatives, trimethylolethane and its derivatives as compatibilizers for enhancing flexibility, Polyhydric alcohols such as pentaerythritol and its derivatives can also be added. It is preferable to add 30% by mass or less of these polyhydric alcohols to the entire photosensitive resin composition. In particular, by improving the compatibility, turbidity of the resin composition and bleed-out of low molecular weight components can be suppressed.

In addition, in a resin intaglio printing plate formed from a photosensitive resin printing plate precursor using the photosensitive resin composition, in order to form a recess having a good shape, light scattering in the photosensitive resin layer is suppressed. An ultraviolet absorber may be added for the purpose. Preferred UV absorbers include benzotriazole-based, triazine-based, and benzophenone-based compounds, and one or more of these can be used. The compounding amount of the ultraviolet absorber is preferably in the range of 0.001 to 5% by mass based on the entire photosensitive resin composition.

{Circle around (4)} In order to enhance the thermal stability of the photosensitive resin composition, a conventionally known (E) polymerization inhibitor can be added. Preferred (E) polymerization inhibitors include phenols, hydroquinones, catechols, N-nitrosamine derivatives and the like. It is preferable to use these amounts in the range of 0.001 to 5 based on the entire photosensitive resin composition.

Further, an organic solvent, a dye, a pigment, a surfactant, an antifoaming agent, a fragrance, and the like can be added to the photosensitive resin composition as other components.
Next, the photosensitive resin laminate will be described.

(4) In the photosensitive resin laminate, an adhesive layer (G), a layer formed of the photosensitive resin composition, and a protective layer are laminated in this order on at least the support (F). The photosensitive resin printing plate precursor is formed using the photosensitive resin laminate. That is, the photosensitive resin printing plate precursor is formed by sequentially laminating at least the adhesive layer (G), the photosensitive resin layer (H) formed of the photosensitive resin composition, and the protective layer on at least the support (F). .

As the support (F), a plastic sheet such as polyester, a synthetic rubber sheet such as styrene-butadiene rubber, or a metal plate such as steel, stainless steel, or aluminum can be used. On the plate and scrape it with a metal doctor blade, or put ink into a ring-shaped ceramic or special metal edged ink cup that serves as a doctor blade and scrape the plate surface with the ink cup. It is preferable to use a metal plate so that the support is not deformed by the force of scraping.

形状 The shape of the support (F) may be a plate, a roll, or the like, but is preferably selected as appropriate depending on the printing method.

The thickness of the support (F) is not particularly limited, but is preferably in the range of 100 to 500 µm from the viewpoint of handleability. If it is 100 μm or more, deformation of the support is suppressed, and if it is 500 μm or less, handleability is improved.

The support (F) is preferably subjected to an easy adhesion treatment for the purpose of improving the adhesiveness with the photosensitive resin layer (H). Examples of the method of the easy adhesion treatment include mechanical treatment such as sandblasting, physical treatment such as corona discharge, and chemical treatment such as coating, and the like. Is preferred.

The adhesive layer (G) is not particularly limited as long as it improves the adhesiveness between the support (F) and the photosensitive resin layer (H). The adhesive layer (G) preferably further contains at least a part of the structural units contained in the photosensitive resin layer (H), so that the adhesiveness is further improved. As such a common constituent unit, a polymer compound having solubility in a solution containing a lower alcohol is exemplified. Further, as the soluble polymer compound, a polyamide resin containing a unit of ε-caprolactam can be preferably mentioned. The photosensitive resin layer (H) is formed from the above photosensitive resin composition. The thickness of the photosensitive resin layer (H) is preferably 0.01 mm or more, more preferably 0.02 mm or more, from the viewpoint of having a sufficient relief depth and improving printability. On the other hand, the thickness of the photosensitive resin layer (H) is preferably 1 mm or less, more preferably 0.7 mm or less from the viewpoint of cost and resource saving.

(4) The photosensitive resin printing plate precursor preferably has a cover film (I) as a protective layer on the photosensitive resin layer (H) from the viewpoint of surface protection and prevention of adhesion of foreign matter and the like. The photosensitive resin layer (H) may be in direct contact with the cover film (I), or may have one or more layers between the photosensitive resin layer (H) and the cover film (I). Good. The layer between the photosensitive resin layer (H) and the cover film (I) includes, for example, a release auxiliary layer (J) provided for the purpose of preventing the surface of the photosensitive resin layer from sticking.

材質 The material of the cover film (I) is not particularly limited, but a plastic sheet such as polyester or polyethylene is preferably used. The thickness of the cover film (I) is not particularly limited, but is preferably in the range of 10 to 150 μm from the viewpoint of handleability and cost. The cover film surface may be roughened for the purpose of improving the adhesion of the original film.

Next, a method for producing a photosensitive resin intaglio printing plate precursor will be described. For example, after heating and dissolving polyamide (A) in a mixed solvent containing alcohol as a main component, (B) an ethylenic double bond-containing compound, (C) a photopolymerization initiator, and if necessary, inorganic fine particles and a plasticizer Other additives and the like are added, stirred and mixed well to obtain a photosensitive resin composition solution.

The photosensitive resin layer (H) containing the photosensitive resin composition is obtained by casting the photosensitive resin composition solution obtained by the above method on a support (F) having an adhesive layer (G), It can be obtained by drying. Thereafter, the cover film (I) to which the release auxiliary layer (J) is arbitrarily applied is brought into close contact with the photosensitive resin layer (H) to obtain a photosensitive resin printing plate precursor. Alternatively, a photosensitive resin printing plate precursor can be obtained by preparing a photosensitive resin sheet by dry film formation and laminating the photosensitive sheet between the support (F) and the cover film (I) so as to sandwich the photosensitive sheet. Further, a photosensitive resin composition containing no inorganic fine particles (D) can be provided between the adhesive layer (G) and the photosensitive resin layer (H).

When the photosensitive resin printing plate precursor has a release auxiliary layer (J), the method of forming the release auxiliary layer (J) is not particularly limited. However, for ease of thin film formation, the component of the release auxiliary layer (J) is dissolved in a solvent. The method of applying the solution thus obtained on the cover film (I) and removing the solvent is particularly preferably performed. Examples of the method for removing the solvent include hot-air drying, far-infrared drying, and natural drying. The solvent that dissolves the component of the release assisting layer (J) is not particularly limited, but water, alcohol, or a mixture of water and alcohol is preferably used.

Next, a method for producing a resin intaglio printing plate of the present invention formed using a photosensitive resin printing plate precursor will be described. The printing plate of the present invention can be obtained by exposing and developing a photosensitive resin printing plate precursor in this order. The exposing step includes a step of using an original film having an original image portion and halftone dots inside the original image portion. An original image portion and an original film having halftone dots inside the original image portion can be obtained by the following method. First, an original image is taken into image processing software, for example, “Adobe Illustrator” (manufactured by Adobe Systems). Next, the original image portion is selected, the offset value is set to -0.020 mm to -0.30 mm from the offset of the path on the object tab, and the original image portion is bordered. Thereafter, the color density of the trimmed portion is set to K100%, and the color density of the original image portion other than the trimmed portion is set to a value other than K100% to obtain an original image portion and an original film having halftone dots inside the original image portion. Can be. Hereinafter, an example of the production method will be described, but the production method of the resin intaglio printing plate of the present invention is not limited thereto.

First, trim the edge of the original image in the positive original film to be used. The original image area is an area corresponding to the image area of the intaglio printing plate. The bordering is effective to avoid the halftone dots from the edge of the image part. By forming a halftone screen on the original part other than the bordered part, the image part of the intaglio printing plate corresponding to the edge part of the original part is obtained. Is improved. The width of the border portion of the original image portion is preferably 20 μm or more, more preferably 30 μm or more, and even more preferably 40 μm or more, from the viewpoint of improving the linearity of the edge of the image portion in the printed matter. Further, from the viewpoint of changing the depth of the image portion and adjusting the amount of ink at the time of printing, the thickness is preferably 300 μm or less, more preferably 150 μm or less, and even more preferably 80 μm or less.

Next, a halftone screen is formed at a portion other than the border of the original image portion to produce a positive film integrated with the original image portion and the halftone screen. It is sufficient that the halftone dot is included at least inside the original image portion.
The halftone dots present in the original image portion preferably have a halftone dot area ratio of 3% or more and 20% or less when the original image portion area is 100%. The halftone dot area ratio is an area ratio of halftone dots existing in the original image portion, and the area ratio is represented by a white area ratio with respect to the original image portion area. In the original film, white halftone dots exist in the black original image portion. For the dot area ratio, an arbitrary 10 points were selected on the original image portion of the positive film, and a Macbeth transmission densitometer “TR-927” (Kollmorgen Instruments Corp.) was used for the selected points using an orthochromatic filter. (Manufactured by Sharp Corporation). In the present invention, an average value of the measurement results at the ten points is defined as a dot area ratio. The halftone dot area ratio is preferably 3% from the viewpoint of eliminating unevenness in scraping of ink due to dropping into the concave portion of the doctor blade when scraping excess ink present on the surface of the resin intaglio printing plate with a doctor blade or the like. And more preferably 5% or more. From the viewpoint of increasing the depth of the resin intaglio printing plate and adjusting the amount of ink during printing, it is preferably 20% or less, more preferably 15% or less.

Thereafter, when the photosensitive resin printing plate precursor is provided with the cover film (I), the cover film is peeled off, the integrated positive film is brought into close contact with the photosensitive resin layer (H), and is irradiated with ultraviolet light, whereby intaglio printing is performed. The depth of the concave portion can be adjusted by forming the halftone dots while forming the image portion on the plate. In addition, by trimming the edges of the original image portion, halftone dots do not overlap the edges of the image portion, so that unintended cut portions do not occur at the edges of the image portion in the printed matter, and the linearity of the image portion edge of the printed material is reduced. Is improved. Ultraviolet irradiation can be performed using a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp, a xenon lamp, a carbon arc lamp, a chemical lamp, or the like, which can normally emit a wavelength of 300 to 400 nm.

(4) Next, the photosensitive resin printing plate precursor is immersed in a developer, and a relief image is formed on the substrate by a brush-type developing device that removes uncured portions by rubbing with a brush. In addition to the brush type developing device, a spray type developing device can be used. As the developer, a solution containing a lower alcohol or a solution containing a surfactant can be used.

液 The liquid temperature during development is preferably from 15 to 40 ° C. After forming the relief image, the resin is dried at 50 to 70 ° C. for about 10 minutes and, if necessary, is subjected to actinic ray treatment in air or vacuum as a post-exposure step to obtain a resin intaglio printing plate.

In addition, the photosensitive resin composition is most suitable for use in a photosensitive resin printing plate precursor for resin intaglio printing, especially for pad printing, but is used as a lithographic printing, letterpress printing, stencil printing, or photoresist. It is also possible.

In addition, the resin intaglio printing plate in which the support is a plastic film is lighter and easier to handle than the resin intaglio printing plate in which the metal is the support. As a method of fixing a resin intaglio printing plate in which such a support is a plastic film to a pad printing machine, a double-sided tape is attached to the support of the resin intaglio printing plate, and one side of the double-sided tape is attached to a plate base of the pad printing machine. There is a method of fixing the resin intaglio printing plate to the support, as compared to fixing the resin intaglio printing plate made of metal, especially an iron plate to the plate stand with a magnet. It is time-consuming and may be difficult to use from the viewpoint of re-sticking work (replacement work) (reworkability).

In addition, in pad printing, ink on the printing plate surface is scraped off by a blade, but when a resin intaglio printing plate is used, the support is deformed when the ink is scraped off by the blade, In some cases, good pad printing cannot be performed.

Therefore, when a resin intaglio printing plate whose support is a plastic film is used in pad printing, it is easy to replace (excellent reworkability), and in addition, the support is deformed even when the ink is scraped off by a blade. It is preferable to use a member (a plate or a structure) for making it difficult.

It is preferable that such a plate has an adhesive layer on at least one side of the substrate. The adhesive layer is preferably located on the outermost layer.

As the base material, any of metal and plastic, wood, glass, ceramics and the like can be adopted. Iron or aluminum is preferable as the metal, and polyester or the like is preferable as the plastic. Of these, iron is easy to fix to the plate base when a magnet is used for the plate base of the pad printing machine, and is particularly preferably used.

The thickness of the substrate is preferably 200 μm or more and 1 cm or less. With a mechanical strength of 200 μm or more, the ink is placed on the plate surface and scraped off with a metal doctor blade, or a ring-shaped ink cup with a ceramic or special metal edge serving as a doctor blade It is possible to satisfactorily put the ink inside and scrape off the plate surface with the ink cup. That is, it is possible to suppress deformation of the support when the blade scrapes ink. Further, it is preferable that the base material is 1 cm or less from the viewpoint of attachment to a printing machine and cost.

The pressure-sensitive adhesive layer is a layer having self-adhesiveness. For example, the pressure-sensitive adhesive layer described in Japanese Patent Application Laid-Open No. 2014-122285 can be used, but is not limited thereto.

厚み The thickness of the adhesive layer is preferably 1 to 100 μm, more preferably 5 to 75 μm. When the thickness is 1 μm or more, a sufficient adhesive strength to an adherend can be secured, and when the thickness is 100 μm or less, processing at the time of forming an adhesive layer becomes easy.

The plate is fixed to the support of the intaglio printing plate via the adhesive layer of the plate. The adhesive strength of the resin intaglio printing plate, which is the adherend of the adhesive layer, to the support is preferably in the range of 0.015 N to 0.1 N / 25 mm. When it is 0.015 N / 25 mm or more, the ink is placed on the plate surface of the resin intaglio printing plate and scraped off with a metal doctor blade, or a ring-shaped ceramic or special metal made as a doctor blade It is possible to satisfactorily put the ink into the edged ink cup and scrape the plate surface with the ink cup. That is, it is possible to suppress deformation of the support when the blade scrapes ink. Further, from the viewpoint of the re-sticking operation (reworkability), the thickness is preferably 0.1 N / 25 mm or less.

Next, a method of forming an adhesive layer on a substrate is described. As a first example, a method of applying a component of the adhesive layer on a substrate, and as a second example, an adhesive layer is formed A method in which a film is prepared, an adhesive is applied to the surface of the film opposite to the surface on which the adhesive layer is formed, and the film is bonded to a substrate through the adhesive. Adhesive layer on one side of, using a film formed with an adhesive layer capable of bonding to the substrate on the other side, such a method of bonding the film to the substrate via the adhesive layer, and the like, Absent.

The size of the plate is preferably a size that can be attached to the plate of the printing press.

By using such a plate, even if a resin intaglio printing plate whose support is a plastic film is used, it is easy to replace (excellent reworkability), and in addition, deformation of the support during scraping of ink by a blade. Can be suppressed.

Such a plate is used when producing a printed material by pad printing. It is preferable that a method for producing a printed matter by pad printing using such a plate includes the following steps in that order.
Step 1) A step of fixing the support of the resin intaglio printing plate to the plate via the adhesive layer of the plate to obtain a structure.
Step 2) mounting the structure on a pad printing machine.

By using the above method, even if a resin intaglio printing plate whose support is a plastic film is used, it can be easily replaced (excellent in reworkability), and in addition, when the ink is scraped off with a blade, Deformation can be suppressed. As a result, the printability of pad printing can be improved.

In the present invention, a structure in which the support of the resin intaglio printing plate is fixed (integrated) to the plate via the adhesive layer of the plate may be used.

That is, the structure is a structure having a resin layer having a concave portion, a support, an adhesive layer, and a substrate in that order.

Such a structure can be used when producing printed matter by pad printing. The method for producing a printed matter by pad printing using such a structure preferably includes a step of mounting the structure on a pad printing machine.

By using such a structure or method, even if a resin intaglio printing plate in which the support is a plastic film is used, it can be easily replaced (excellent in reworkability), and in addition, the support during scraping of the ink by the blade can be obtained. Deformation of the body can be suppressed. As a result, the printability of pad printing can be improved.

The technique described in the specification of Japanese Patent Application No. 2017-120049 can be applied to the plate, the structure, and the method using them.
The object on which printing can be performed using the intaglio printing plate of the present invention is not particularly limited, and examples thereof include paper, plastic, cloth, glass, metal, and ceramics. Among these, the resin intaglio printing plate of the present invention is preferably used for printing on a so-called non-absorbing material which does not absorb ink such as plastic, glass, metal, and ceramics. And printing on plastics, glass, metals and ceramics. The electrode circuit is required to have high linearity in order to prevent disconnection even in a fine pattern. However, by using the present invention, it is possible to provide a printed matter having excellent linearity at the end of an image portion without disconnection.

Hereinafter, the present invention will be described in detail with reference to Examples.
<Preparation of support (F) having adhesive layer (G)>
66 parts by mass of "Vinitol" (registered trademark) # 284 (manufactured by Nagoya Yuka Co., Ltd.) and 2 parts by mass of hexamethylenetetramine (manufactured by Kanto Chemical Co., Ltd.) were used in a solvent comprising 16 parts by mass of dimethylformamide and 16 parts by mass of xylene. To the mixed solution, a solution obtained by mixing 90 parts by mass of bisphenol A “jER” (registered trademark) 834 (manufactured by Mitsubishi Chemical Corporation) with a solvent of 30 parts by mass of dimethylformamide and 30 parts by mass of xylene was added, and an adhesive layer ( G) Coating liquid 1 was obtained.

20 parts by mass of “Amilan” (registered trademark) CM833 (manufactured by Toray Industries, Inc.) and 10 parts by mass of “CJPARL” (manufactured by Automotive & Industrial Systems Co.) are 50 parts by mass of ethanol, 10 parts by mass of water, 10 parts by mass of dimethylformamide, And 50 parts by mass of benzyl alcohol were mixed and dissolved at 70 ° C. for 2 hours. Thereafter, 5 parts by mass of bisphenol A “jER” (registered trademark) 834 (manufactured by Mitsubishi Chemical Corporation) and 0.3 parts by mass of dicyanodiamide (manufactured by Kanto Chemical Co., Ltd.) were added at 25 ° C., and an adhesive layer (G ) Was obtained.

The coating liquid 1 for the adhesive layer (G) was applied onto a 250 μm-thick iron plate (manufactured by Nippon Steel & Sumitomo Metal Corporation) as the support (F), and then dried with a bar coater so that the film thickness became 10 μm. After heating in an oven at 180 ° C. for 3 minutes to remove the solvent, a coating liquid 2 for the adhesive layer (G) was applied thereon with a bar coater so as to have a dry film thickness of 10 μm. For 3 minutes to obtain a support (F) having an adhesive layer (G).

<Cover film (I)>
“Lumirror” (registered trademark) S10 (polyester film, manufactured by Toray Industries, Inc.) having a thickness of 100 μm was used as the cover film (I).
<Photosensitive resin printing plate precursor>
The materials used in the photosensitive resin printing plate precursor are shown below.
Polyamide (A):
Polyamide having an aliphatic ring in the molecular main chain:
Polyamide 1 having a number-average molecular weight of 85,000 (manufactured by Toray Industries, Inc.) in which ε-caprolactam, hexamethylene diammonium adipate and 4,4′-diaminodicyclohexylmethane adipate are polycondensed in approximately the same amount. 80 parts by weight were used.

(B) Ethylenic double bond-containing compound A compound having one ethylenic double bond having one hydroxyl group, 20 parts by mass of glycerol dimethacrylate (light ester G101P manufactured by Kyoeisha Chemical Co., Ltd.), 2-hydroxypropyl methacrylate (Kyoeisha Chemical (C) Light polymerization initiator, 2,2-dimethoxy-1,1-diphenylethan-1-one ("IRGACURE" (registered trademark) 651 manufactured by BASF) 3 parts by mass Department.

Other components: Inorganic fine particles (D): SC-2500SQ (manufactured by Admatechs Co., Ltd., spherical silica, sphericity: 0.95, average particle diameter: 0.5 μm) 20 parts by mass Polymerization inhibitor: N- (ammonium) Oxy) -N-nitrosophenylamine (Kuperon, manufactured by Kanto Chemical Co., Ltd.) 0.01 parts by mass ・ Ultraviolet absorber: 2,4-di-tert-butyl-6- (5-chloro-2H-1,2, 0.01 parts by mass of 3-benzotriazol-2-yl) phenol (“TINUVIN” (registered trademark) 326, manufactured by BASF).
After mixing the above polyamide (A) and 180 parts by mass of a mixed solvent of water / ethanol = 10/90 (weight ratio) in a three-necked flask equipped with a stirring spatula and a cooling tube, the mixture was stirred at 80 ° C. while stirring. The mixture was heated for 2 hours to dissolve the polyamide (A). After cooling to 40 ° C., the above components (B), (C) and other components were added, mixed, and further dispersed using a continuous media dispersing machine (NANO GRAIN MILL, manufactured by Asada Iron Works Co., Ltd.). A resin composition was obtained. The obtained photosensitive resin composition was applied to a support (F) having the adhesive layer (G) with a bar coater, and dried at 60 ° C. for 2.5 hours. At this time, the thickness of the plate after drying (iron plate + photosensitive resin layer) was adjusted to 0.5 mm. On the photosensitive resin layer (H) thus obtained, a mixed solvent of water / ethanol = 10/90 (weight ratio) is applied, and a cover film (I) is pressed on the surface to print the photosensitive resin. The original plate was obtained.

<Positive film>
A black carbon film TK100 (manufactured by Takano Machinery Co., Ltd.) was placed on an external drum type plate setter “CDI SPARK” (manufactured by Esco Graphics Co., Ltd.) equipped with a fiber laser having a light emitting region in the infrared, and the base material side was a drum. The test patterns corresponding to the image portions and the halftone dots shown in Table 1 were drawn under the conditions of a laser output of 9 kW and a drum rotation speed of 400 rpm, to produce positive films 1 to 10. The height difference between the surface of the resin intaglio printing plate and the deepest portion of the recess between the dots among the recesses provided on the printing plate surface was adjusted by changing the dot diameter of the positive film.
[Evaluation method]
Evaluation in each example and comparative example was performed by the following method.
(1) Height difference between the surface of the resin intaglio printing plate and the deepest portion of the recess existing between the halftone dots among the recesses provided on the printing plate surface, and the net provided on the surface of the resin intaglio printing plate and the recess on the surface. The height difference at the deepest part existing between the points is observed at a magnification of 20 times using a laser microscope “VK-X250” (manufactured by KEYENCE CORPORATION), and the average of the measurement results at 10 points is compared with the surface of the printing plate and the screen. The height difference from the deepest part of the concave portion existing between the points was set.
(2) The linear resin intaglio printing plate at the end of the image area is mounted on a hermetic 6-12 universal (manufactured by TAMPPRINT), and once using PAD-PLV-1 Ink White (manufactured by Navitas) as the ink. After the squeegee, it was transferred to a pad and printed on a PET film. The end of the image portion of the obtained printed matter was observed using a digital microscope “VHX-2000” (manufactured by KEYENCE CORPORATION) with a lens Z250 and a magnification of 250 times, and the amplitude s of the end shape in the printed matter shown in FIG. Was measured. The amplitude s refers to the depth from the original image portion end 5 to the maximum cut point 6 in a portion cut out by a cut portion that does not exist in the original film and has occurred at the image portion end of the printed matter. In FIG. 2, a line 9 is an auxiliary line for confirming that the point 6 has the maximum depth. When measured with a digital microscope, the amplitude having the maximum depth among the amplitudes projected on the screen was defined as the amplitude s.
As an evaluation criterion, when the amplitude s was 30 μm or more, the linearity was poor, the edge of the printed matter was jagged, and a printing defect occurred. If the amplitude was less than 30 μm, it was judged as acceptable, if it was within 20 μm, it was judged as good, and if it was within 10 μm, it was judged as excellent.
Example 1
Only the polyester film of the cover film (I) was peeled off from the photosensitive resin printing plate precursor having a size of 7 cm × 14 cm (the outermost surface of the photosensitive resin printing plate precursor after peeling was a release auxiliary layer having a dry film thickness of 1 μm). The positive film 1 is brought into close contact with a vacuum, and exposed with a chemical lamp FL20SBL-360 20 watt (manufactured by Mitsubishi Electric OSRAM Co., Ltd.) under the condition of a gray scale sensitivity of 13 ± 1 steps (main exposure), and a photosensitive resin of 7 cm × 14 cm. The entire surface of the layer was light cured. Thereafter, the film was developed with an aqueous solution of ethanol (ethanol / water = 80/20) at a liquid temperature of 25 ° C. for 1 minute using a brush-type developing device, dried at 60 ° C. for 10 minutes, and further subjected to a chemical lamp FL20SBL-360 20 watt (Mitsubishi Electric OSRAM) (Manufactured by Co., Ltd.) under the same conditions as the main exposure to obtain a resin intaglio printing plate. In the resin intaglio printing plate of Example 1, the image and the halftone dot were formed so as to have the minimum distance shown in Table 1. Table 2 shows the evaluation results of Example 1.

Examples 2 to 7
Resin intaglio printing plates of Examples 2 to 7 were produced in the same manner as in Example 1 except that the positive film as a plate making member was changed as shown in Table 1. Table 2 shows the evaluation results.

Comparative Examples 1 and 2
A photosensitive resin printing plate precursor and resin intaglio printing plates of Comparative Examples 1 and 2 were produced in the same manner as in Example 1 except that the positive film as a plate making member was changed as shown in Table 1. Table 2 shows the evaluation results.

Comparative Example 3
A positive film described in Table 2 was adhered in vacuum, and exposed to a chemical lamp FL20SBL-360 20 watt (manufactured by Mitsubishi Electric OSRAM Co., Ltd.) under the condition of a gray scale sensitivity of 13 ± 1 step (main exposure). The entire surface of the photosensitive resin layer was light-cured. Next, a halftone screen film of 300 lines and 90% was brought into close contact with each other and screen-exposed. Thereafter, the film was developed with an aqueous solution of ethanol (ethanol / water = 80/20) at a liquid temperature of 25 ° C. for 1 minute using a brush-type developing device, dried at 60 ° C. for 10 minutes, and further subjected to a chemical lamp FL20SBL-360 20 watt (Mitsubishi Electric OSRAM) (Manufactured by Co., Ltd.) under the same conditions as the main exposure to obtain a resin intaglio printing plate of Comparative Example 3. Table 2 shows the evaluation results.

1 Halftone 2 Tangent line 3 Non-image part 4 Image part 5 Original image part edge 6 Maximum cutting point 7 Non-image part of printed matter 8 Image part of printed matter 9 Auxiliary line d Minimum distance between image part end and halftone dot s Amplitude P Contact Q Point on the edge of the image area

Claims

A resin intaglio printing plate in which an image portion having a halftone dot is formed on the surface of the plate material, wherein the minimum distance between the edge of the image portion and the halftone dot located closest to the edge of the image portion is 20 μm or more and 300 μm or less. Is a resin intaglio printing plate.
The resin intaglio printing plate according to claim 1, wherein a diameter of the halftone dot is 5.0 μm or more and 50 μm or less.
3. The resin intaglio printing plate according to claim 1, wherein the height difference between the surface of the resin intaglio printing plate and the deepest portion of the recesses between the halftone dots among the recesses provided on the printing plate surface is 10 to 40 μm. .
2. The resin intaglio printing plate is a photosensitive resin laminate having a photosensitive resin layer formed of a photosensitive resin composition containing at least a binder polymer, an ethylenically unsaturated compound, and a photopolymerization initiator. 4. The resin intaglio printing plate according to any one of items 1 to 3.
5. The intaglio printing plate of claim 4, wherein the binder polymer is a polyamide having a 4,4'-diaminodicyclohexylmethane adipate skeleton.
The resin intaglio printing plate according to any one of claims 1 to 5, wherein the resin intaglio printing plate has a photosensitive resin layer, and the photosensitive resin layer contains inorganic fine particles having an average particle diameter of 0.5 μm or more and 4.0 μm or less. Resin intaglio printing plate.
The resin intaglio printing plate according to claim 6, wherein the inorganic fine particles have a sphericity of 0.90 or more.
The resin intaglio printing plate according to claim 6, wherein the inorganic fine particles are amorphous silica.
9. The resin intaglio printing according to claim 6, wherein the inorganic fine particles are contained in the photosensitive resin layer in an amount of 3% by mass or more and 30% by mass or less when the mass of the photosensitive resin layer is 100% by mass. Edition.
The resin intaglio printing plate according to any one of claims 1 to 9, which is for pad printing.
The resin intaglio printing plate according to any one of claims 1 to 10, which is for non-absorbable raw material printing.
A method for producing a resin intaglio printing plate, in which an exposure step and a development step are performed in this order on a photosensitive resin printing plate precursor, wherein the exposure step has an original image portion and a halftone dot inside the original image portion. A method for producing a resin intaglio printing plate, the method comprising:
A printing method for printing using a resin intaglio printing plate in which an image portion having a halftone dot is formed on a surface of a plate material, wherein a halftone dot is formed in an area other than an area in which a distance from an edge of the image part is 20 μm or less. Forming a recording material, filling the image portion with a recording material, a first transfer step of transferring the recording material filled in the image portion to a transfer member, and forming the recording material transferred to the transfer member. A second transfer step of transferring the image to a print material to form a print material.