JP2001260560A - Block copy sheet for lithography - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a block copy sheet for a lithographic printing plate which can surely prevent plate elongation and positional slippage of the printing plate on a plate cylinder of a press and which makes the plate having a substrate of a material other than metal applicable also to multicolor printing and printing of a large number of sheets and satisfies the printing performance and durability under the conditions of repeated use. SOLUTION: In the block copy sheet for lithography having an indented shape at least in one surface of the substrate of which the initial modulus is 350 kgf/mm2 or above, the indented shape is formed by an indented surface constituted of particles of particle diameters 1-100 μm and an integrated resin and by an overcoat layer provided thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underlay sheet for lithographic printing for preventing a lithographic printing plate from being displaced on a plate cylinder of a printing press.

[0002]

2. Description of the Related Art Generally, in a lithographic printing press,
The lithographic printing plate is wound around the plate cylinder and mechanically fixed, and printing is performed. Conventionally, as a support for a lithographic printing plate, a support made of a material such as a metal, a plastic film, and paper has been used. A lithographic printing plate using a material other than metal as a support,
Compared with a lithographic printing plate using a metal as a support, it is excellent in handling suitability, but lacks dimensional stability. In lithographic printing, the peripheral speed of the plate cylinder and the blanket cylinder are generally different, and a force for stretching the plate is continuously applied during printing. for that reason,
In the case of a lithographic printing plate using a material other than metal as a support, the plate is stretched or misaligned during printing, and it has been difficult to perform full-color printing which requires a precise positioning system.

[0003] As a solution, there is a method of fixing a plate on a plate cylinder using spray paste (Japanese Patent Laid-Open No. 56-1125).
No. 8) and a method of fixing using an adhesive (Japanese Patent Publication No. 7-42)
No. 5, Japanese Patent Application Laid-Open No. 61-104853) has been proposed, but once it is fixed to the plate cylinder, it becomes difficult to finely adjust the alignment required later. Not valid.

Further, in a lithographic printing plate using a support other than metal as a support, there is a problem that it is difficult to position the plate at the tip of the plate cylinder and fix the grip because the support is soft. As a solution to this, a positioning method provided with multi-point pins to facilitate the positioning (Japanese Patent Laid-Open No. Hei 10-24555)
No.) has been proposed, but it cannot deal essentially with the problem caused by the soft plate.

[0005] By using a sheet material having an initial elastic modulus of 300 kgf / mm ² or less, the positional accuracy and dimensional accuracy during high-speed printing are improved, and surface treatment is performed chemically or physically. By providing a fine uneven surface (matte surface) fixed to the surface, the frictional resistance between the plate cylinder and the printing plate is reduced to ensure free sliding of the printing plate and to facilitate the registration adjustment. Hanging method (JP-A-11-2
0130) has been proposed. However, it has been found that even if this technique makes it possible to align and fix the grip, it is not possible to sufficiently suppress plate elongation and displacement.

On the other hand, an underlaying sheet having an uneven surface in which specific fine projections are formed and distributed on the surface of a sheet-like substrate (JP-A-11-59012) has been proposed. The underlay sheet cuts into the back of the lithographic printing plate to suppress the plate elongation of the lithographic printing plate, and furthermore, the effect of surface irregularities enables fine positioning, but this underlay sheet is However, when printing is performed at a high printing pressure, the unevenness on the surface of the underlay sheet is easily broken, and there is a problem in durability under severe use conditions. In particular, this problem is significant because the desorbed particles fly off during desorption after printing, contaminating the surroundings and hindering the printing machine and printing performance.

[0007]

As described above, when performing full-color printing on a lithographic printing plate using a material other than metal as a support, prevention of plate growth, alignment of the plate, durability in repeated use, etc. are all required. There is no satisfactory technology, and there has been a problem that full-color printing on such a lithographic printing plate is limited to extremely few copies.

Accordingly, an object of the present invention is to reliably prevent the lithographic printing plate from elongating and being displaced on a plate cylinder of a printing press, whereby, for example, a lithographic printing plate using a material other than metal as a support. The object of the present invention is to provide an underlay sheet for a lithographic printing plate which can be applied to printing of multiple colors and a large number of sheets and can satisfy printing performance and durability under severe use conditions.

[0009]

It has been found that the above object can be achieved by the following constitutions (1) and (2).

(1) Initial elastic modulus is 350 kgf / mm ²
In the underlay sheet for lithographic printing having an uneven shape on at least one surface of the above support, the uneven shape has a particle size of 1 to 1.
An underlay sheet for lithographic printing, comprising an uneven surface comprising particles of 00 μm and a binder resin and an overcoat layer provided thereon.

(2) The underlay sheet for lithographic printing according to claim 1, wherein the unevenness of the support has a center line average roughness Ra of 2 to 20 μm.

In the present invention, the initial elastic modulus is 350 kgf /
After at least one surface of a support having a size of ² mm or more, specific fine particles are dispersed in a binder resin to form an uneven surface (the unevenness formed from the fine particles and the binder resin is particularly referred to as an uneven surface). An uneven shape (the unevenness obtained by providing the overcoat layer is particularly referred to as an uneven shape) is obtained by providing an overcoat layer. By providing the overcoat layer, falling off of the fine particles can be effectively prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an underlay sheet of the present invention will be described in detail.

The support of the underlay sheet is 350 kgf / m
Any sheet shape having an initial elastic modulus of m ² or more may be used.For example, a metal plate, a resin sheet, a metal-resin composite sheet or the like is used, preferably an aluminum plate, a zinc plate,
Titanium plate, metal plate such as stainless steel, copper-aluminum plate, copper-stainless steel plate, pi-metal plate such as chrome-copper plate, chrome-copper-aluminum, chrome-lead-iron plate, tri-metal plate such as chrome-copper-stainless steel plate , PET sheet, PE sheet, PP sheet, polyester sheet,
Polyimide sheet, polyamide sheet, resin sheet such as acrylic resin sheet, aluminum-PET sheet, aluminum-PE sheet, aluminum-polyester sheet, titanium-PET sheet, metal-resin composite sheet such as titanium-PE sheet, more preferably Examples include an aluminum plate, a metal plate such as stainless steel, a resin sheet such as a PET sheet and a PE sheet, and a metal-resin composite sheet such as an aluminum-PET sheet and an aluminum-polyester sheet. The thickness of the support is suitably about 50 to 250 μm. The measurement of the initial elastic modulus is based on JIS K712.
7 can be performed.

The particles used for forming an uneven surface on the surface of the underlay sheet of the present invention are particles having a particle size of 1 to 100 μm. Preferably, the average particle size is 1 to 80 μm, and more preferably, the average particle size is 1 to 50 μm. The material of the particles of the present invention is not particularly limited, and is a particle made of an inorganic material, an organic material, an organic-inorganic composite material, or the like. Particles having a higher hardness than the back surface of the lithographic printing plate support are preferably used.

Examples of the inorganic particles include metal powders, metal oxides, metal nitrides, metal hydroxides, metal sulfides, metal carbides and composite metal compounds thereof, preferably glass, SiO ₂ , TiO ₂ , ZnO, Fe ₂ O ₃ ,
Oxides such as ZrO ₂ and SnO ₂ and sulfides such as ZnS and CuS.

As the organic particles, for example, synthetic resin particles,
Natural polymer particles and the like, preferably acrylic resin, polyethylene, polypropylene, polyethylene oxide, polypropylene oxide, polyethylene imine, polystyrene, polyurethane, polyurea, polyester, polyamide, polyimide, carboxymethyl cellulose, gelatin, starch, chitin, chitosan, etc. And more preferably synthetic resin particles such as acrylic resin, polyethylene, polypropylene, and polystyrene.

As the organic-inorganic composite particles, for example,
At least 2 of materials forming inorganic particles and organic particles of
Or more composites, preferably glass, S
iO _Two, TiO_Two, ZnO, Fe_TwoO_Three, ZrO_Two, SnO_Two
Oxides and / or sulfides such as ZnS and CuS
Lil resin, polyethylene, polypropylene, polyethylene
Oxide, polypropylene oxide, polyethylene
Nimine, polystyrene, polyurethane, polyurea,
Polyester, polyamide, polyimide, carboxime
Chill cellulose, gelatin, starch, chitin, chitosa
And more preferably a compound such as SiO2._Two, T
iO_Two, ZnO, Fe_TwoO_Three, ZrO_Two, SnO_TwoOxidation of etc.
Resin and polyether having a hydrogen bonding functional group
Tylene oxide, polypropylene oxide, polyether
Tylene imine, polyurethane, polyurea, polyester
, Polyamide, polyimide, carboxymethyl cellulose
Complex of glucose, gelatin, starch, chitin, chitosan, etc.
Things.

In the present invention, organic resins (lipophilic resins, water-soluble resins, etc.), organic resin emulsions, inorganic All natural, semi-synthetic, and synthetic resins such as resins and organic-inorganic hybrid resins can be used, and can be used after being cured as necessary.

Examples of the lipophilic organic resin include acrylic resins (polymethyl methacrylate, polymethyl acrylate, polyethyl methacrylate, various alkyl, aralkyl or aryl acrylate copolymers, various alkyl, aralkyl or aryl methacrylate copolymers, etc.). ), Alkyd resin (melamine resin, phenol resin, etc.), polystyrene resin, polyvinyl acetate resin, epoxy resin,
Polyalkylene resins (polyethylene, polypropylene, etc.), polyester resins, polyurethane resins and the like can be mentioned.

Examples of the water-soluble organic resin include cellulose, cellulose derivatives (cellulose esters; cellulose nitrate, cellulose sulfate, cellulose acetate, cellulose propionate, cellulose succinate, cellulose butyrate, cellulose acetate succinate, cellulose acetate butyrate, phthalate acetate). Cellulose ethers such as acid cellulose; methyl cellulose, ethyl cellulose, cyanoethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl hydroxyethyl cellulose, etc.), starch, starch derivatives (oxidized starch, esterification) Starches; nitric acid, sulfuric acid, phosphoric acid, acetic acid, propionic acid, butyric acid, amberjack And etherified starches; methylated, ethylated, cyanoethylated, hydroxyalkylated, carboxymethylated, etc.), alginic acid, pectin, carrageenan, tamarind gum, natural gums (gum arabic, Guar gum, locust bean gum, tragacanth gum, xanthan gum, etc.), pullulan, dextran, casein, gelatin, chitin, chitosan, polyvinyl alcohol, polyalkylene glycol [polyethylene glycol, polypropylene glycol, (ethylene / propylene glycol) copolymer, etc.], allyl Alcohol copolymer, acrylic acid copolymer, methacrylic acid copolymer, polyamino acid,
Polyamide (Polymer or copolymer of N-substituted acrylamide or methacrylamide [eg, methyl, ethyl, propyl, isopropyl,
Butyl, phenyl, monomethylol, 2-hydroxyethyl, 3-hydroxypropyl, 1,1-bis (hydroxymethyl) ethyl, 2,3,4,5,6-pentahydroxypentyl group, etc.), polyamine (polyethylene) Imine, polyallylamine, polyvinylamine and the like), polyurea (urea resin and the like) and the like.

Examples of the organic resin emulsion include acrylic resins (polymethyl methacrylate, polymethyl acrylate, polyethyl methacrylate, various alkyl, aralkyl or aryl acrylate copolymers, various alkyl, aralkyl or aryl methacrylate copolymers, etc.). Emulsions, alkyd resin (melamine resin, phenol resin, etc.) emulsions, styrene resin emulsions, vinyl acetate resin emulsions, epoxy resin emulsions, alkylene resin (polyethylene, polypropylene, etc.) emulsions, ester resin emulsions, urethane resin emulsions, and the like.

As the inorganic resin, a resin containing a bond in which a metal atom is connected via an oxygen atom or a nitrogen atom (hereinafter referred to as a resin).
Metal-containing resin). The metal-containing resin indicates a polymer mainly containing a bond composed of "oxygen atom (nitrogen atom) -metal atom-oxygen atom (nitrogen atom)".

Among the metal-containing resins, the resin having an oxygen atom-metal atom-oxygen atom bond is preferably a polymer obtained by hydrolytic polycondensation of a metal compound represented by the following general formula (I). . Here, the hydrolysis polycondensation is a reaction in which a reactive group repeatedly undergoes hydrolysis and condensation under acidic or basic conditions to polymerize.

Formula (I) (R ⁰ ) _n M (Y) _xn [In the formula (I), R ⁰ represents a hydrogen atom, a hydrocarbon group or a heterocyclic group, Y represents a reactive group, M represents a trivalent to hexavalent metal, x represents a valence of the metal M, and n represents 0, 1,
Represents 2, 3 or 4. However, xn is 2 or more. ]

Next, the metal compound represented by formula (I) will be described in detail. R ⁰ in the general formula (I) is preferably a linear or branched alkyl group having 1 to 12 carbon atoms which may be substituted, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group Group, hexyl group,
A heptyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group, and the like; examples of a group that can be substituted with these groups include a halogen atom (a chlorine atom, a fluorine atom, and a bromine atom), a hydroxy group, a thiol group, a carboxy group, and a sulfo group. Group, cyano group, epoxy group, -OR 'group (R' is a hydrocarbon group such as methyl group, ethyl group, propyl group, butyl group, hexyl group, heptyl group, octyl group, decyl group, propenyl group, butenyl Group, hexenyl group, octenyl group, 2-
Hydroxyethyl group, 3-chloropropyl group, 2-cyanoethyl group, N, N-dimethylaminoethyl group, 2-bromoethyl group, 2- (2-methoxyethyl) oxyethyl group, 2-methoxycarbonylethyl group, 3-carboxy Propyl group, benzyl group, etc.), -OCOR '
Group, -COOR 'group, -COR' group, -N (R ")
(R ″) (R ″ represents a hydrogen atom or the same contents as R ′, and may be the same or different), —NHCON
HR ′ group, —NHCOOR ′ group, —Si (R ′) ₃ group,
—CONHR ″ group, —NHCOR ′ group and the like.
These substituents may be substituted plurally in the alkyl group)｝,

A linear or branched alkenyl group having 2 to 12 carbon atoms which may be substituted (for example, vinyl group, propenyl group, butenyl group, pentenyl group, hexenyl group, octenyl group, decenyl group, dodecenyl group and the like) Examples of the group that can be substituted with these groups include those having the same contents as the groups that can be substituted with the alkyl group, and may be substituted with a plurality of groups. Good aralkyl groups (eg, benzyl, phenethyl, 3
-Phenylpropyl group, naphthylmethyl group, 2-naphthylethyl group and the like;
Examples thereof include those having the same contents as the groups which can be substituted with the alkyl group, and may be substituted plurally.)
Alicyclic groups which may be substituted with 0 (for example, cyclopentyl group, cyclohexyl group, 2-cyclohexylethyl group, 2-cyclopentylethyl group, norbornyl group, adamantyl group, etc .;
The same substituents as those of the alkyl group may be mentioned, and a plurality of the substituents may be substituted. An optionally substituted aryl group having 6 to 12 carbon atoms (for example, a phenyl group, a naphthyl group, Is the same as the group which can be substituted with the alkyl group, and may be substituted plurally),

Alternatively, a condensed heterocyclic group having at least one atom selected from a nitrogen atom, an oxygen atom and a sulfur atom (for example, a heterocyclic ring includes a pyran ring, a furan ring, a thiophene ring, a morpholine Ring, pyrrole ring, thiazole ring, oxazole ring, pyridine ring, piperidine ring, pyrrolidone ring, benzothiazole ring, benzoxazole ring, quinoline ring, tetrahydrofuran ring, etc., which may contain a substituent. The same contents as the substituents in the alkyl group are mentioned, and plural substituents may be used).

The reactive group Y is preferably a hydroxy group, a halogen atom (representing a fluorine atom, a chlorine atom, a bromine atom or an iodine atom), a —OR ¹ group, a —OCOR ² group,
CH (COR ³ ) (COR ⁴ ) group, —CH (COR ³ )
Represents a (COOR ⁴ ) group or a —N (R ⁵ ) (R ⁶ ) group.

In the —OR ¹ group, R ¹ has 1 to 10 carbon atoms.
Which may be substituted (for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, propenyl, butenyl, heptenyl) Hexenyl, octenyl, decenyl, 2-hydroxyethyl, 2-hydroxypropyl, 2-methoxyethyl, 2- (methoxyethyloxy) ethyl, 2-
(N, N-diethylamino) ethyl group, 2-methoxypropyl group, 2-cyanoethyl group, 3-methyloxypropyl group, 2-chloroethyl group, cyclohexyl group, cyclopentyl group, cyclooctyl group, chlorocyclohexyl group, methoxycyclohexyl group Benzyl, phenethyl, dimethoxybenzyl, methylbenzyl, bromobenzyl, etc.).

In the —OCOR ² group, preferably R
² represents the same content as R ^1, and is preferably an aliphatic group or an aromatic group having 6 to 12 carbon atoms which may be substituted (an aromatic group is exemplified by the aryl group in the aforementioned R ^0. The same thing is mentioned).

A —CH (COR ³ ) (COR ⁴ ) group and —C
In the H (COR ³ ) (COOR ⁴ ) group, R ³ is an alkyl group having 1 to 4 carbon atoms (eg, a methyl group, an ethyl group, a propyl group, a butyl group, etc.) or an aryl group (eg, a phenyl group, a tolyl group) , A xylyl group, etc.), and R ⁴ is an alkyl group having 1 to 6 carbon atoms (eg, a methyl group, an ethyl group,
Propyl, butyl, pentyl, hexyl, etc.),
An aralkyl group having 7 to 12 carbon atoms (for example, a benzyl group,
A phenethyl group, a phenylpropyl group, a methylbenzyl group, a methoxybenzyl group, a carboxybenzyl group, a chlorobenzyl group or the like; or an aryl group (for example, phenyl, tolyl, xylyl, mesityl, methoxyphenyl, chlorophenyl, carboxy) Phenyl group, diethoxyphenyl group, etc.).

In the —N (R ⁵ ) (R ⁶ ) group, R ⁵
And R ⁶ may be the same or different from each other, and each is preferably a hydrogen atom or an aliphatic group having 1 to 10 carbon atoms which may be substituted (for example, the same content as R ^{1 in the} above-mentioned OR ¹ group) ). More preferably, R ⁵
And the total number of carbon atoms of R ⁶ is 12 or less.

The metal M is preferably a transition metal, a rare earth metal, or a metal of Groups III to V of the periodic table. More preferably, Al, Si, Sn, Ge, Ti, Zr, etc. are mentioned, and Al, Si, Ti, Zr, etc. are more preferably mentioned. Particularly, Si is preferable.

Specific examples of the metal compound represented by the general formula (I) include, but are not limited to, the following.

Methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane, ethyltrichlorosilane, ethyltribromosilane, ethyltrimethoxysilane, ethyltrimethoxysilane Ethoxysilane, ethyltriisopropoxysilane, ethyltri-t-butoxysilane, n-propyltrichlorosilane, n-propyltribromosilane, n-
Propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxysilane, n
-Propyltri-t-butoxysilane, n-hexyltrichlorosilane, n-hexyltribromosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyltriisopropoxysilane, n-
Hexyltri-t-butoxysilane, n-decyltrichlorosilane, n-decyltribromosilane, n-decyltrimethoxysilane, n-decyltriethoxysilane, n
-Decyltriisopropoxysilane, n-decyltri-t
-Butoxysilane, n-octadecyltrichlorosilane, n-octadecyltribromosilane, n-octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n-octadecyltri-t-butoxysilane, phenyltrichlor Silane, phenyltribromosilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriisopropoxysilane, phenyltri-t-butoxysilane,

Tetrachlorosilane, tetrabromosilane, tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, tetrabutoxysilane, dimethoxydiethoxysilane, dimethyldichlorosilane,
Dimethyldibromosilane, dimethyldimethoxysilane,
Dimethyldiethoxysilane, diphenyldichlorosilane, diphenyldibromosilane, diphenyldimethoxysilane, diphenyldiethoxysilane, phenylmethyldichlorosilane, phenylmethyldibromosilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, triethoxyhydrosilane , Tribromohydrosilane, trimethoxyhydrosilane, isopropoxyhydrosilane, tri-t-butoxyhydrosilane, vinyltrichlorosilane, vinyltribromosilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltri-t-butoxysilane, Trifluoropropyltrichlorosilane, trifluoropropyltribromosilane, trifluoropropyltrimethoxysila , Trifluoropropyl triethoxysilane, trifluoropropyl triisopropoxysilane, trifluoropropyl tri t- butoxysilane,

Γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ
Glycidoxypropyltriisopropoxysilane, γ
-Glycidoxypropyltri-t-butoxysilane, γ-
Methacryloxypropylmethyldimethoxysilane, γ
-Methacryloxypropylmethyldiethoxysilane,
γ-methacryloxypropyltrimethoxysilane, γ
-Methacryloxypropyltriisopropoxysilane, γ-methacryloxypropyltri-t-butoxysilane, γ-aminopropylmethyldimethoxysilane, γ
-Aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropoxysilane, γ-aminopropyltri-t-butoxysilane, γ-mercaptopropylmethyldimethoxysilane ,
γ-mercaptopropylmethyldiethoxysilane, γ-
Mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltri-t-butoxin lan, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- ( 3,4
-Epoxycyclohexyl) ethyltriethoxysilane,

Ti (OR)_Four(R is a methyl group, an ethyl group,
Propyl, butyl, pentyl, hexyl, etc.),
TiCl_Four, Zn (OR)_Two, Zn (CH_ThreeCOCHCOC
H_Three) _Two, Sn (OR)_Four, Sn (CH_ThreeCOCHCOCH_Three)
_Four, Sn (OCOR)_Four, SnCl_Four, Zr (OR)_Four, Zr
(CH_ThreeCOCHCOCH_Three)_Four, Al (OR)_Three. Above metal
Compounds can be used alone or in combination to produce metal-containing resins
Used.

Examples of the metal-containing resin having a nitrogen atom-metal atom-nitrogen atom bond include polysilazane.

In the present invention, it is preferable to use a composite of the above-mentioned metal-containing resin and an organic polymer having a group capable of forming a hydrogen bond with the resin as the binder resin.
The composite of the metal-containing resin and the organic polymer is used to include a sol-like substance and a gel-like substance.

The organic polymer contains a group capable of forming a hydrogen bond with a metal-containing resin (hereinafter, also referred to as a specific bonding group). The specific bonding group preferably includes at least one bond selected from an amide bond (including a carboxylic acid amide bond and a sulfonamide bond), a urethane bond, and a ureido bond, and a hydroxyl group.

The organic polymer includes, as a repeating unit component, a polymer containing the specific bonding group of the present invention in the main chain and / or side chain of the polymer. Preferably, as a repeating unit ^{component, -N (R 11) CO -} , - N (R 11)
Examples include a component in which at least one bond selected from SO ₂ —, —NHCONH—, and —NHCOO— exists in the main chain and / or side chain of the polymer, and / or a component containing an —OH group. R ¹¹ in the amide bond represents a hydrogen atom or an organic residue, and examples of the organic residue include those having the same contents as the hydrocarbon group and the heterocyclic group in R ⁰ in Formula (I). .

The polymer main chain contains the specific bonding group of the present invention.
The polymer having -N (R ¹¹) CO-bond or
Is -N (R¹¹) SO_TwoAmide resin having a bond, -N
Ureido resin having HCONH-bond, -NHCOO
-Urethane resins containing bonds.

Examples of the diamines and dicarboxylic acids or disulfonic acids used in the production of the amide resin, the diisocyanates used for the ureide resin, and the diols used for the urethane resin include, for example, "Polymer Data Handbook-"Basics-"Chapter I (published by Baifukan) (1
986), Shinzo Yamashita, Tosuke Kaneko, "Crosslinking Agent Handbook", Taiseisha, 1981, and the like.

Examples of the other polymer having an amide bond include a polymer having a repeating unit represented by the following general formula (II), an N-acylated polyalkyleneimine, and polyvinylpyrrolidone and derivatives thereof.

[0047]

Embedded image

In the formula (II), Z ¹ represents —CO—, —SO ₂ — or —CS—. R ²⁰ has the same content as R ⁰ in formula (I). r ¹ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms (eg, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, etc.). r ¹ may be the same or different. p represents an integer of 2 or 3.

Among the polymers containing a repeating unit represented by the general formula (II), the polymer in which Z ¹ represents a —CO— bond and p represents 2 is obtained by catalyzing oxazoline which may have a substituent. By ring-opening polymerization in the presence of Examples of the catalyst include sulfates and sulfonates such as dimethyl sulfate and alkyl p-toluenesulfonate; alkyl halides such as alkyl iodide (eg, methyl iodide); metal fluorides among Friedel-Crafts catalysts; Acids such as sulfuric acid, hydrogen iodide and p-toluenesulfonic acid, and oxazolinium salts which are salts of these acids with oxazoline can be used. This polymer may be a homopolymer or a copolymer. Further, a copolymer in which this polymer is grafted to another polymer may be used.

Specific examples of oxazolines include, for example,
2-oxazoline, 2-methyl-2-oxazoline, 2
-Ethyl-2-oxazoline, 2-propyl-2-oxazoline, 2-isopropyl-2-oxazoline, 2-
Butyl-2-oxazoline, 2-dichloromethyl-2-
Oxazoline, 2-trichloromethyl-2-oxazoline, 2-pentafluoroethyl-2-oxazoline, 2
-Phenyl-2-oxazoline, 2-methoxycarbonylethyl-2-oxazoline, 2- (4-methylphenyl) -2-oxazoline, 2- (4-chlorophenyl)
-2-oxazoline and the like. Preferred oxazolines include 2-oxazoline, 2-methyl-2-oxazoline, 2-ethyl-2-oxazoline, and the like. One or two or more of such oxazoline polymers can be used.

For other polymers having a repeating unit represented by the general formula (II), thiazoline, 4,5-dihydro-1,3-oxazine or 4,5-dihydro-1,3-thiazine is used instead of oxazoline. Can be obtained similarly.

[0052] The N- acylated derivative of a polyalkyleneimine, -N obtained by a polymer reaction of a carboxylic acid halide (CO-R ²⁰⁾ - carboxylic acid amide comprising a or a high sulfonyl halides -N obtained by molecular reaction
(SO ₂ —R ²⁰ ) —- containing sulfonamide compound (where,
R ²⁰ has the same meaning as R ²⁰ in formula (II)) can be mentioned.

Examples of the polymer containing a specific bonding group in the side chain of the polymer include those containing at least a component containing at least one type of bonding group selected from the specific bonding group. Can be Examples of such components include acrylamide, methacrylamide, crotonamide, vinylacetamide, and the following compounds. However, it is not limited to these.

[0054]

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[0055]

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On the other hand, the hydroxyl group-containing organic polymer may be any of a natural water-soluble polymer, a semi-synthetic water-soluble polymer, and a synthetic polymer. Polymer Compound I "published by Asakura Shoten (196
0), Business Development Center Publishing Division, "Water-soluble Polymer / Water-dispersible Resin Comprehensive Technical Data Book", Business Development Center Publishing Division (1981), Nagatomo Shinji, "Applications and Markets of New Water-Soluble Polymers" ( Published by CMC Corporation (1988), "Development of Functional Cellulose" Published by CMC Corporation (1985)
Year)).

For example, natural and semi-synthetic polymers include cellulose, cellulose derivatives (cellulose esters; cellulose nitrate, cellulose sulfate, cellulose acetate, cellulose propionate, cellulose succinate, cellulose butyrate, cellulose acetate succinate, acetate acetate). Cellulose ethers such as cellulose butyrate and cellulose acetate phthalate; methyl cellulose, ethyl cellulose, cyanoethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl hydroxyethyl cellulose, etc.), starch, starch derivatives ( Oxidized starch, esterified starches; nitric acid, sulfuric acid, phosphoric acid, acetic acid, propion , Butyric acid, esterified products such as succinic acid, etherified starches; derivatives such as methylated, ethylated, cyanoethylated, hydroxyalkylated, carboxymethylated), alginic acid, pectin, carrageenan, tamarind gum, natural gums ( Gum arabic, guar gum, locust bean gum, tragacanth gum, xanthan gum, etc.), pullulan, dextran, casein, gelatin, chitin, chitosan and the like.

Examples of the synthetic polymer include polyvinyl alcohol, polyalkylene glycol (polyethylene glycol, polypropylene glycol, (ethylene glycol / propylene glycol) copolymer, etc.), allyl alcohol copolymer, and acryl containing at least one hydroxyl group. Polymers or copolymers of acid esters or methacrylic esters (for example, 2
-Hydroxyethyl group, 3-hydroxypropyl group,
2,3-dihydroxypropyl group, 3-hydroxy-2
-Hydroxymethyl-2-methylpropyl group, 3-hydroxy-2,2-di (hydroxymethyl) propyl group,
Polyoxyethylene group, polyoxypropylene group,
Etc.), N-substituted polymers or copolymers of acrylamide or methacrylamide (for example, monomethylol group, 2-hydroxyethyl group, 3-
Hydroxypropyl group, 1,1-bis (hydroxymethyl) ethyl group, 2,3,4,5,6-pentahydroxypentyl group, etc.). However, the synthetic polymer is not particularly limited as long as it has at least one hydroxyl group in the side chain substituent of the repeating unit.

The weight average molecular weight of the organic polymer used in the present invention is preferably 10 ³ to 10 ⁶ , and more preferably 5 to 10 ⁶ .
× 10 ³ to 4 × 10 ⁵ .

In the composite of the metal-containing resin and the organic polymer of the present invention, the ratio of the metal-containing resin and the organic polymer can be selected in a wide range, but the ratio by mass of the metal-containing resin / organic polymer is 10/90 to 90/90. 10, more preferably 2
0/80 to 80/20.

The binder resin containing the above complex is, for example, a metal-containing resin formed by the hydrolytic polycondensation of the above-mentioned metal compound, in which the hydroxyl group and the specific bonding group in the organic polymer are hydrogen. A uniform organic-inorganic hybrid is formed by the binding action, and becomes microscopically homogeneous without phase separation. When a hydrocarbon group is present in the metal-containing resin, it is presumed that the affinity with the organic polymer is further improved due to the hydrocarbon group. Since the composite has both organic and inorganic properties, it has a strong interaction with both inorganic and organic particles,
The binder resin strongly adheres to the particles. Further, this composite is excellent in film-forming properties.

The composite of the metal-containing resin and the organic polymer is produced by hydrolytic polycondensation of the metal compound and mixing with the organic polymer, or by hydrolyzing the metal compound in the presence of the organic polymer. It is produced by condensation. Preferably, in the presence of an organic polymer,
An organic-inorganic polymer composite can be obtained by hydrolytic polycondensation of the metal compound by a sol-gel method. In the formed organic-inorganic polymer composite, the organic polymer is uniformly dispersed in a matrix of a gel (ie, a three-dimensional fine network structure of an inorganic metal oxide) formed by hydrolytic polycondensation of a metal compound.

The sol-gel method as a preferred method can be carried out using a conventionally known sol-gel method. Specifically, "Thin-film coating technology by sol-gel method" (Technical Information Association) (published) (1995), Saio Sakuhana "Science of sol-gel method" (Agne Shofusha) (published) (1988), Takashi Hirashima, "Technology for preparing functional thin films by the latest sol-gel method," General Technology Center (published) (19)
1992) according to a method described in detail in a written document.

The solvent used for forming the uneven surface is water,
It is appropriately selected from organic solvents and the like. Examples of the organic solvent include alcohols (methanol, ethanol, propyl alcohol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, ethylene glycol monomethyl ether, propylene glycol monomethyl ether, ethylene glycol monoethyl ether, etc.), and ethers (tetrahydrofuran, Ethylene glycol dimethyl ether, propylene glycol dimethyl ether, tetrahydropyran, etc.), ketones (acetone, methyl ethyl ketone, acetylacetone, etc.), esters (methyl acetate, ethylene glycol monomethyl monoacetate, etc.), amides (formamide, N-methylformamide, pyrrolidone) , N-methylpyrrolidone, etc.). One or two solvents
More than one species may be used in combination.

When the above complex is used, it is preferable to use an acidic catalyst or a basic catalyst in combination to promote the hydrolysis and polycondensation reaction of the metal compound represented by the general formula (I). . As the catalyst, an acid or basic compound used as it is or in a state of being dissolved in a solvent such as water or alcohol (hereinafter referred to as an acidic catalyst or a basic catalyst, respectively) is used. The concentration at that time is not particularly limited, but when the concentration is high, the rate of hydrolysis and polycondensation tends to increase. However, if a highly concentrated basic catalyst is used, a precipitate may be formed in the sol solution. Therefore, the concentration of the basic catalyst is desirably 1 N (mol / L) (concentration conversion in an aqueous solution) or less.

The type of the acidic catalyst or the basic catalyst is not particularly limited, but when it is necessary to use a catalyst having a high concentration, a catalyst composed of an element that hardly remains in the catalyst crystal grains after sintering is used. Good. Specifically, examples of the acidic catalyst include hydrogen halides such as hydrochloric acid, nitric acid, sulfuric acid,
Sulfurous acid, hydrogen sulfide, perchloric acid, hydrogen peroxide, carbonic acid, carboxylic acids such as formic acid and acetic acid, substituted carboxylic acids obtained by substituting R of the structural formula RCOOH with other elements or substituents, sulfonic acids such as benzenesulfonic acid, Examples of the basic catalyst include ammoniacal bases such as aqueous ammonia, and amines such as ethylamine and aniline.

The binder resin is based on 100 parts by weight of the particles.
Generally, it is used in a proportion of 8 to 50 parts by weight, preferably 10 to 30 parts by weight. Within this range, the effects of the present invention are effectively exhibited.

Further, a crosslinking agent may be added. Examples of the crosslinking agent include compounds that are usually used as a crosslinking agent. Specifically, Shinzo Yamashita and Tosuke Kaneko, “Handbook of Crosslinking Agents” Taiseisha (1981), edited by the Society of Polymer Science, “Polymer Data Handbook, Basics”, Baifukan (19)
1986) can be used.

For example, ammonium chloride, metal ions,
Organic peroxides, polyisocyanate compounds (for example, toluylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, polymethylenephenyl isocyanate, hexamethylene diisocyanate, isophorone diisocyanate, polymer polyisocyanate And polyol compounds (eg, 1,4-butanediol, polyoxypropylene glycol, polyoxyethylene glycol, 1,1,1
-Trimethylolpropane, etc.), polyamine-based compounds (e.g., ethylenediamine, γ-hydroxypropylated ethylenediamine, phenylenediamine, hexamethylenediamine, N-aminoethylpiperazine, modified aliphatic polyamines, etc.), polyepoxy group-containing compounds and epoxy Resins (eg, “New Epoxy Resin” edited by Hiroshi Kakiuchi, published by Shokodo 1985), “Epoxy Resins” edited by Kuniyuki Hashimoto, compounds described in Nikkan Kogyo Shimbun (1969), etc., and melamine resins (eg, Ichiro Miwa) , Edited by Hideo Matsunaga, "Uria Melamine Resin", compounds described in Nikkan Kogyo Shimbun (1969), etc., poly (meth) acrylate compounds (for example, "Oligomers" edited by Shin Okawara, Takeo Saegusa, Toshinobu Higashimura) Kodansha (1976), Eizo Omori "Functional acrylic resin" Techno System (1985)
And the like)).

In order to form an irregular surface on the surface of the support of the underlay sheet, a method in which a dispersion in which particles are dispersed in a binder resin is applied and dried is performed. For example, a method of pushing into a binder resin film with a mechanical pressure may be used.

The overcoat layer of the present invention is made of a film-forming resin, and the same one as described for the binder resin for forming the above-mentioned uneven surface is used. Preferably, a hydrophilic overcoat layer is used on the uneven surface containing the hydrophilic binder resin, and a hydrophobic overcoat layer is used on the uneven surface containing the hydrophobic binder resin so that the adhesion to the uneven surface is good. Can be

The overcoat layer of the present invention can be obtained by applying a coating solution containing the above-mentioned film-forming resin and a solvent on the above-mentioned uneven surface by using a conventionally known coating method, drying and forming a film. it can. As the solvent, the above-mentioned solvents can be used as appropriate. Examples of the coating method include coater coating (air doctor, blade, rod, squeeze, gravure, etc.), spray coating (air spray, electrostatic spray, etc.).

The uneven surface of the underlay sheet of the present invention has a center line average roughness Ra of preferably 2 to 20 μm.
m, more preferably 2 to 15 μm, even more preferably 2 to
10 μm.

In order to fix the underlay sheet of the present invention to the plate cylinder, a conventionally known method is used. For example, a method of applying an adhesive or a pressure-sensitive adhesive such as a spray paste or a double-sided tape to the back surface of the underlay sheet support, or locking the leading and trailing ends of the underlay sheet by claws provided on the plate cylinder And the like. Further, a method combining these can also be used.

At the time of printing by the lithographic printing press, the lithographic printing plate is mounted on the plate cylinder via the underlay sheet of the present invention.
At this time, the unevenness of the surface of the underlay sheet is pressed into contact with the back surface of the lithographic printing plate, whereby the convex portion acts to bite into the back surface of the lithographic printing plate. Thus, the underlay sheet can adjust the printing pressure of the blanket cylinder and the impression cylinder, and can prevent the lithographic printing plate from being displaced on the plate cylinder due to the pressurization.

[0076]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

Example 1 and Comparative Example 1 <Preparation of Underlay Sheet for Lithographic Printing> 20 g of acrylic emulsion AE322 (manufactured by JSR Corporation) was added to 50 g of water while stirring, and glass particles G having an average particle diameter of 30 μm were further added.
B731 (manufactured by Toshiba Glass Co., Ltd.) was added, and the mixture was placed in a paint shaker (manufactured by Toyo Seiki Co., Ltd.) together with the glass beads. The mixture was diffused for 10 minutes, and then the glass beads were separated by filtration to obtain a dispersion. This dispersion is applied to the surface of a 100 μm thick polyethylene terephthalate (PET) support,
Apply with a wire bar to 5 g / m ² and 10
After drying at 0 ° C. for 3 minutes, an uneven surface was formed on the support. 5 g of polyvinyl alcohol PVA405 (manufactured by Kuraray Co., Ltd.)
Was added to 50 g of water while stirring, and the mixture was stirred for 30 minutes as it was, and tetramethoxysilane (Shin-Etsu Chemical Co., Ltd.) was added to this solution.
After stirring for 30 minutes, 1 ml of concentrated hydrochloric acid was added, and the mixture was stirred for 2 hours, and the obtained overcoat layer coating solution was adjusted to 1 g / m ² on the uneven surface with a wire bar. It was applied and dried at 110 ° C. for 3 minutes to obtain an underlay sheet for lithographic printing (Example 1).

<Preparation of Underlay Sheet 1 for Comparative Lithographic Printing>
In the same manner as in Example 1, an underlay sheet having only an uneven surface formed on a polyethylene terephthalate support was prepared (Comparative Example 1).

<Evaluation> A lithographic printing plate having a thickness of 100
A silver salt diffusion transfer type photosensitive material having a support of μm polyethylene terephthalate (PET) as a support, and Super Master Plus (130 μm in total thickness) manufactured by Agfagewald Co., Ltd. was used as a plate made by a dedicated plate maker SPM415. In addition, a lithographic printing plate obtained by electrophotography can be used.

Next, the underlay sheet and the lithographic printing plate were cut into a width of 560 mm and a length of 400 mm, respectively, and the lithographic printing plate was placed in such a manner that the backside of the lithographic printing plate was in contact with the surface of the underlay sheet having the uneven shape. And the underlay sheet. The stacked lithographic printing plate and underlay sheet were mounted on a plate cylinder of a single-sided printing press of Oliver 52 manufactured by Sakurai. Before printing,
The surface of the lithographic printing plate was squeezed with a sponge impregnated with the treatment liquid G671c (manufactured by Agfagewald). As the fountain solution on the printing press, a solution obtained by diluting the treatment liquid G671c with water at a ratio of 1: 1 was used. As the ink, New Champion F gloss 85 manufactured by Dainippon Ink and Chemicals, Inc. was used. One plate was used to print 2000 sheets (first time), the plate was replaced, and printing was repeated 10 times using the same block.

The position of the ruled line printed on the printed matter immediately after the start of printing is compared with the position of the ruled line printed on the printed matter after printing 2,000 sheets. The misregistration of the printing plate was evaluated. Furthermore, after repeating 2,000 sheets / plate printing ten times, the degree of peeling of the particles on the surface of the underplate sheet was observed with an optical microscope, and evaluated by visual judgment. Table 1 shows the results.
Shown in

[0082]

[Table 1]

The evaluation criteria in each table are as follows. “Print misregistration” less than 50 μm; ○, 50 μm or more and 100 μm
Less than; Δ, 100 μm or more; × No “particle peeling”; ○, less; Δ, more; ×

From the results, it can be seen that the use of the underlay sheet of Example 1 enables good printing without causing misregistration and peeling of particles. On the other hand, if there is no overcoat layer as shown in Comparative Example 1, the interaction between the particles and the binder resin is not sufficient, and the particles are peeled off by repeated use, thereby fixing the lithographic printing plate. Becomes difficult and misregistration occurs.

Examples 2 to 14 In the same manner as in Example 1, an underlay sheet in which only the resin of the overcoat layer was changed to the material shown in Table 2 below was prepared and evaluated.

[0086]

[Table 2]

Example 2 using various overcoat layers
As in Example 1, the underlay sheets obtained in Nos. To 22 could effectively prevent the desorption of the particles, and could effectively prevent the misregistration even in repeated use.

Examples 23 to 33 In the same manner as in Example 1, only the material of the uneven surface
An underlay sheet changed to the material shown in No. 3 was prepared and evaluated.

[0089]

[Table 3]

In the underlay sheets of Examples 23 to 33 using various uneven surfaces, similarly to Example 1, the desorption of particles can be effectively prevented, and the misregistration can be effectively prevented even in repeated use. I was able to.

[0091]

According to the present invention, the initial elastic modulus is 350 kg.
f / mm ² or more of the support has a particle size of 1 to
By using an undersurface sheet having an uneven surface composed of 100 μm particles and a binder resin and an overcoat layer provided thereon, even in repeated use, particles can be prevented from falling off, and plate misregistration can be effectively prevented. Can be prevented.

Claims (2)

[Claims] 1. A planographic printing plate having an irregularity on at least one side of a support having an initial elastic modulus of 350 kgf / mm ² or more, wherein the irregularity has a particle diameter of 1 to 100.
An underlay sheet for lithographic printing, comprising an uneven surface made of μm particles and a binder resin and an overcoat layer provided thereon. 2. The underlay sheet for lithographic printing according to claim 1, wherein the unevenness of the support has a center line average roughness Ra of 2 to 20 μm.