JPH0636098B2 - Photosensitive resin plate material for flexo and its manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a photosensitive resin plate material for flexography, and more specifically, by providing an anchor layer made of polyurethane between the flexographic support structure and the photosensitive layer, the photosensitive layer and the support are supported. The present invention relates to a photosensitive resin plate material for flexo, which has a particularly improved adhesion to the body structure.

BACKGROUND ART Generally, photosensitive resin plate materials are used for newspaper printing, flexographic printing, screen printing, etc., but especially in the flexo printing field where a plate thickness of 1 mm or more is used, the purpose is to reduce the weight of the plate material and improve printability. On a support structure provided with a continuous or closed cell foam layer of polyurethane or polyolefin and an adhesive layer on one surface of a polyester film having excellent dimensional stability, with or without an adhesive layer, the polymer A photosensitive resin plate material provided with a photosensitive layer composed of a binder component, an addition polymerizable unsaturated monomer and a photopolymerization initiator has been proposed.

However, in such a plate material, the constituent materials of the foam layer and the photosensitive layer are different, and further, the monomer contained in the photosensitive layer or a plasticizer added as appropriate migrates to the interface with the foam layer, Since the adhesive force at the interface is reduced, the adhesive force between the adhesive on the foam layer and the photosensitive layer is reduced during storage of the plate material, and there is a problem that peeling occurs during plate making or peeling during printing. A solution is strongly desired.

The problem to be solved by the invention is to provide a photosensitive resin plate material for flexo having a supporting structure having a polyurethane or polyolefin cell foam layer provided on a polyester film and a photosensitive layer as a main constituent, It is an object of the present invention to provide a photosensitive resin plate material that retains excellent adhesion between the structure and the photosensitive layer and does not cause peeling during storage, plate making and printing.

Means for Solving the Problems According to the present invention, the above objects are (A) a support having a polyurethane or polyolefin foam layer provided on one side of a polyester film (B) a foam layer of the support Adhesive layer provided (C) Polyurethane layer (anchor layer) on adhesive layer (D) Polymer having rubber elasticity provided on the polyurethane layer and chemically bonded to the layer, addition-polymerizable polymer A photosensitive layer comprising a saturated monomer and a photopolymerization initiator (E) A developer-soluble slip layer on the photosensitive layer, and (F) a silicone type release layer with or without a silicone release layer provided on the slip layer. And a photosensitive resin plate material for flexo which is a laminate of a sheet-like or film-like protective layer.

Description of Configuration FIG. 1 shows the configuration and manufacturing method of the photosensitive resin plate material of the present invention.

As is clear from the above, in the present invention, a photosensitive resin plate material comprising a photosensitive layer and a support is characterized in that an anchor layer comprising polyurethane is interposed between the photosensitive layer and the support. Is. Therefore, in the present invention, polyurethane or polyolefin continuous cells or closed cells with or without an adhesive layer on one side of a polyester film or sheet having excellent dimensional stability, which is generally suitable for a photosensitive resin plate material for flexography, is used. A support provided with a foam layer of cells and a photosensitive layer comprising a polymer binder component, an addition polymerizable unsaturated monomer and a photopolymerization initiator are used.

Any conventionally known polymer binder component,
For example, crystalline 1,2-polybutadiene, styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, nitrile butadiene resin, lower alcohol or water-soluble polyamide resin, polyurethane resin, polyester resin, polyvinyl alcohol Although a system resin or the like can be used, a polymer having rubber elasticity,
Among them, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, polybutadiene, butadiene-acrylonitrile,
It is particularly preferable in practice to use urethane-modified polybutadiene.

The photosensitive layer has an addition polymerizable unsaturated monomer, for example,
Methyl acrylate, ethyl acrylate, n-propyl acrylate, octyl acrylate, lauryl acrylate, stearyl acrylate, 2-ethylhexyl acrylate, β-hydroxyethyl acrylate,
β-hydroxypropyl acrylate, ethylene glycol acrylate, triethylene glycol diacrylate, polyethylene glycol monoacrylate, polypropylene glycol monoacrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, methoxy polyethylene glycol monoacrylate, ethoxy polyethylene glycol monoacrylate, glycerol di Acrylate, bentaerythritol diacrylate, trimethylolethane acrylate, trimethylolpropane triacrylate,
Tetramethylol methane tetraacrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, octyl methacrylate, lauryl methacrylate, stearyl methacrylate, 2-ethylhexyl methacrylate, β-hydroxyethyl methacrylate, β-hydroxypropyl methacrylate, ethylene glycol methacrylate, triethylene Glycol dimethacrylate, polyethylene glycol monomethacrylate, polypropylene glycol monomethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, methoxypolyethylene glycol monomethacrylate, ethoxypolyethylene glycol monomethacrylate, glycerol dimethacrylate , Ventaerythritol dimethacrylate, trimethylolethane trimethacrylate, trimethylolpropane trimethacrylate, tetramethylolmethane tetramethacrylate, acrylamide,
N-methylol acrylamide, n-butoxymethyl acrylamide, isobutoxy acrylamide, nt-
Butyl acrylamide, methylene bis (acrylamide), ethylene bis (acrylamide), propylene bis (acrylamide), methacrylamide, N-ethylol methacrylamide, n-butoxymethyl methacrylamide, isobutoxy methacrylamide, nt-butyl methacrylamide, Methylene bis (methacrylamide), ethylene bis (methacrylamide), propylene bis (methacrylamide) or a mixture thereof, and a photopolymerization initiator (usually an aromatic ketone having an aromatic ring and a carbonyl group in the molecule, for example, benzoin , Benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, α-methylbenzoin, 2-methylanthraquinone, 9-fluorenone, benzyl, benzylmethyl Tar, acetophenone,
2,2'-dimethoxy-2-phenylacetophenone,
Benzophenone, phenyl-2-thienyl ketone, p-
Dimethylaminobenzophenone, p, p'-tetramethyldiaminobenzophenone and the like: and those having a substituent such as a cyano group, a nitro group, a methoxy group, a sulfonic acid group, phosphinic acid or salts or esters thereof, for example, 2, 6-dimethoxybenzoyl-diphenylphosphinoxide, 2,4,6-trimethylbenzoyl-diphenylphosphinoxide, 2,4
Ethyl ester of 6-trimethylbenzoyl-phenylphosphinic acid, 2,4,6-trimethylbenzoyl-
Phenylphosphinic acid sodium salt, etc.,
If necessary, a thermal polymerization inhibitor (eg hydroquinone, p-
Methoxyphenol, tert-butylcatechol, 2,6-
Di-t-butyl-p-cresol), dyes, pigments, plasticizers, etc. are added.

The photosensitive layer and the foam layer of the support are usually adhered using an adhesive, but the monomer, plasticizer, etc. from the photosensitive layer mainly migrates to the interface, which reduces the adhesive strength of the interface and is being stored. However, peeling between the photosensitive layer and the adhesive on the foam layer is a problem during plate making or printing.

Therefore, in the present invention, by interposing an anchor layer made of polyurethane between the photosensitive layer and the foam layer and bringing the anchor layer and the foam layer into close contact with each other by an adhesive layer,
The anchor layer secures the integrity of the photosensitive layer and the support structure including the foam layer, and the anchor layer causes monomers, plasticizers and the like in the photosensitive layer to migrate to the interface with the adhesive layer on the foam layer. It has succeeded in completely eliminating the problem of peeling during storage of plate material, during plate making, and during printing while preventing the cause of the above. The adhesion between the anchor layer and the photosensitive layer can be conveniently carried out by fusing, adhering or irradiating light from the anchor layer side. Polyurethanes that can be used include those that produce a urethane bond in the reaction process even if there is no urethane bond in the prepolymer. Two-component polyurethane resin obtained by addition reaction of isocyanate and alcohol, isocyanate and alcohol Examples thereof include a moisture-curable polyurethane resin in which the isocyanate residual prepolymer obtained from (1) is crosslinked with moisture in the air. Particularly, a two-component polyurethane resin is practically preferable from the viewpoint of stability and workability.

As the polyol for forming the polyurethane used in the present invention, various polyester polyols, polyether polyols, polylactones and polycarbonate polyols can be used. As the polyester polyol, for example, adipic acid, suberic acid, sebacic acid,
An aliphatic dicarboxylic acid having 4 to 20 carbon atoms such as brassinic acid,
Acid components such as terephthalic acid and isophthalic acid, with 1 to 6 carbon atoms such as ethylene glycol, propylene glycol, neopentyl glycol and hexamethylene glycol
The aliphatic diols, ether glycols such as diethylene glycol and dipropylene glycol, polyester polyols containing spiroglycols as a polyol component, or polycaprolactone polyols can be used. For example, adipate such as polyethylene adipate polyol and polybutylene adipate polyol. Examples thereof include polyols, terephthalic acid polyols, polycaprolactone polyols, and the like.

Specific examples of the polyether polyol include polyoxyethylene polyol, polyoxypropylene polyol, polyoxytetramethylene polyol and the like.

Suitable isocyanate components are the known and customary polyisocyanates, in particular the di-, tri- and tetraisocyanates and preferably those with two or more aromatically bonded isocyanates. An example of this is
Toluylene-2,4 / 2,6-diisocyanate (TD
I), diphenylmethane-4,4'-diisocyanate (MDI), naphthylene-1,5-diisocyanate (NDI), 3,3'-dimethyldiphenyl-4,4 '.
-Diisocyanate (TODI), 1,6-hexamethylene diisocyanate, xylylene diisocyanate,
Mention may be made of triphenylmethane-4,4 ', 4'-triisocyanate, 1,4-cyclohexylene diisocyanate and thionophosphoric acid-tris- [p-isocyanatephenyl] -ester.

For the polyurethane formation to be used in the present invention,
It is used in an amount in the range of 0.3 to 8 equivalents of isocyanate per equivalent of hydroxyl groups in component (A).

As this two-component polyurethane resin, Hibon 425
1, 7663, 7033, 415414120L, 40
32, 7031L (manufactured by Hitachi Chemical Polymer Co., Ltd.) and the like.

Further, for the adhesion between the anchor layer and the foam layer, for example, a commercially available pressure-sensitive adhesive or adhesive can be used. Examples thereof include acrylic adhesives, epoxy adhesives, urethane adhesives, and synthetic rubber adhesives. A two-component acrylic adhesive having a particularly high adhesive strength is practically preferable, and for example, SK Dyne 171
7 (manufactured by Soken Kagaku) and the like. A pigment or dye may be added to the adhesive as appropriate.

The support in the plate material of the present invention is a polyester film having a polyurethane or polyolefin cell foam layer provided on one side thereof, and may be bonded with an adhesive. As the manufacturing method, a method in which a foamed foam layer of polyurethane or polyolefin cut into an appropriate size is pressure-bonded to a polyester film with an ordinary adhesive, or a method in which a urethane or olefin stock solution and a foaming agent are formed on the polyester film is used. For example, there is a method of coating a stock solution and heating it to foam.

The cellular foam layer used in the plate material of the present invention is (B)
It is necessary to have an outer skin on the surface in order to increase the adhesive strength with the adhesive layer.

The present inventors have also found that the object of the present invention can be best achieved when an anchor layer of polyurethane having a thickness of about 5 to 50 μ is interposed.

On the photosensitive layer, a so-called slip layer composed of a polymer material soluble in a developer (including a swellable one) that is bonded to the photosensitive layer is provided on the photosensitive layer, as in the case of a usual flexographic resin plate material. A sheet-shaped or film-shaped protective layer is provided with or without a mold release layer.

Examples of the polymer substance of the slip layer include polyamide resin, urea resin, urethane resin, melamine resin, acrylamide resin, polyvinyl acetate, vinyl copolymer,
Epoxy resin, cellulosic resin, butyral resin, acetal resin, acrylic resin or the like may be used, but as a non-adhesive film having good lubricity, methyl cellulose (eg, Shin-Etsu Chemical Co., Ltd., Metroze), Ethyl cellulose (Example: Etocel manufactured by Dow Chemical Co., Ltd.), polyvinyl alcohol (Example: K manufactured by Nippon Synthetic Chemical Company)
H-20, KH-17), cellulose acetate butyrate (Example: Eastman Kodak CAB381),
It is particularly useful to use carboxymethyl cellulose (eg, Sunrose manufactured by Sanyo Kokusaku Pulp Co., Ltd.), polyvinyl butyral (eg: BM-2 manufactured by Sekisui Chemical Co., Ltd.) and the like.

Examples of the main body of the protective material include sheet-shaped or film-shaped plastic (eg, polyester, polycarbonate, polyacrylate, polypropylene). Preferably, those treated by chemical polishing or physical polishing (eg sandblasting) are used. Particularly, the surface of the main body preferably has an average surface roughness of 5 μm or less.

A silicone type release layer is optionally interposed between the protective material and the slip layer, and the silicone may be an addition reaction curing type or a condensation reaction curing type. As a typical example, for example, Torre silicone paper coating agent-added type SD7226 (catalyst SRX)
-212), condensed SRX-244 (catalyst SRX-24
2AC) is preferably used.

In the flexographic photosensitive resin plate material of the present invention, it is preferable that a dye that photobleaches by actinic radiation in the ultraviolet or visible region, preferably a dye that recolors during development, is present in the photosensitive layer.

Such dyes are specifically, for example, CI for magenta.
Acid Red 249 (Color Index 08134),
CI Direct Red 20 (Color Index 1507
5), CI Acid Red 32 (Color Index 17
065), CI Acid Red 92 (color index
45410), CI Basic Violet 7 (Color Index 48020), CI Basic Red 13 (Color Index 48015), CI Solvent Red 1 (Color Index 12150), CI Solvent Red 23.
(Color index 26100), CI solvent red 49 (color index 45170B), CI solvent red 109 (color index 13900) and the like.

For cyan, CI Acid Blue 83 (Color Index 42660), CI Acid Blue 9 (Color Index 42090), CI Basic Blue 1 (Color Index 42925), CI Basic Blue 5 (Color Index 42140), CI Direct Blue 106
(Color index 51300), CI Disperse Blue 16 (Color index 63395), CI Solvent Blue 2 (Color index 42563B), CI Solvent Blue 36, CI Solvent Blue 93, CI Solvent Blue 73 and the like.

Also, CI Acid Yellow 25 (color index 18835) and CI Acid Yellow 29 are used as yellow colors.
(Color Index 18900), CI Acid Yellow 42 (Color Index 22910), CI Disperse Yellow 3 (Color Index 11855), CI Reactive Yellow 2 (Color Index 18972) and the like.

In addition, CI Acid Black 52 (color index 15711) and CI Acid Black 24 are used as black.
(Color Index 26370), CI Direct Black 17 (Color Index 27700), etc. Water,
Any solvent that can be dissolved in alcohol or an organic solvent can be used. Of course, these dyes can be used alone or in combination.

In particular, having an anthraquinone structure, for example, CI 42563B
When such a dye is used, the degree of recoloring of the exposed portion after elution and drying is remarkable during development, which is convenient for purposes such as plate inspection.

Generally, when high resolution is required for thick plates,
In a photosensitive resin plate material that uses a transparent sheet support, controlled exposure is performed from the transparent sheet side, the photosensitive layer is cured by a certain thickness, and the photosensitive layer is activated by the deoxidizing effect inside the plate material. High resolution images are obtained with the back exposure and the main exposure through negative exposure.

However, when an opaque support is used, such as a cellular foam layer, exposure for activation purposes from the backside of the plate is virtually possible. Therefore, in order to resolve fine dots and halftone dots, long-time main exposure is required, and it has been pointed out that white areas in solid areas and the depth of shadow areas become shallow, and when high resolution is required. Separation between the photosensitive layer of the photosensitive resin plate material for flexography and the foam layer was considered to be another problem.

In a preferred embodiment of the present invention, when the photobleachable dye as described above is present in the photosensitive layer, the shoulder angle becomes sharp at the time of image exposure, there is the advantage that the white gap is deep and the exposure latitude is wide. It is possible to provide a plate material excellent in resolution of fine dots and halftone dots without performing an exposure operation for activation from the back surface of the material. Furthermore, by selecting a dye having the property of recoloring at the time of development, the image can be viewed at the time of development, so it is possible to avoid the inadvertent removal of fine dot or line images by the brushing operation, It is also useful for cutting off excess plate material and for other purposes such as plate inspection.

The photosensitive resin plate material according to the present invention can be produced by a method known to those skilled in the art, such as coating, laminating, fusing, and adhering, and in particular, the plate material of the present invention is obtained by a method shown in FIG. You can

First, a polyurethane layer (C) is formed on a plastic layer having a silicone type release layer on one surface. The plastic layer having (C) is pressure-bonded to the photosensitive layer (D) having the protective layer (F) and the slip layer (E). Then, actinic radiation is applied from the plastic layer side. By this light irradiation, the polyurethane layer (C) is chemically bonded to the surface of the photosensitive layer (D). Then, the plastic layer is peeled off, and the photosensitive layer (D) and the adhesive layer (B) having the polyurethane layer on the surface
The photosensitive resin of the present invention is obtained by pressure-bonding the support (A) having

In use, a good flexographic plate can be obtained by peeling off the protective layer in a sheet or film form, exposing it through a negative film, and then eluting and drying the non-exposed portion of the slip layer and the photosensitive layer by a normal developing method. The peeling of the photosensitive layer and the foam layer during plate making and printing is effectively prevented.

The present invention will be described below with reference to examples.

Example 1 <Preparation of Photosensitive Layer (D)> 70 parts of crystalline 1,2-polybutadiene (Japan Synthetic Rubber Co., Ltd. “JSR RB810”, crystallinity 15%, 1,2-bond structure 88%, number average molecular weight approximately) 110,000), neopentyl glycol dimethacrylate 10 parts, 2,2'-dimex-2-phenylacetophenone 3 parts, diisodecyl phthalate 40 parts, Califlex TR1112 20 parts, P-
Methoxyphenol 0.05 parts, Sumiplast Blue G
(0.001 part of CI Solvent Blue 11, Sumitomo Chemical C
I. 61525), among the above components, the crystalline 1,2 polybutadiene and Califlex TR1112 are placed in a pressure kneader and mixed at a temperature of 90 ° C. for 30 minutes, and then 2,2′-dimethoxy-2-phenylacetophenone sumiplast is prepared in advance. A solution of Blue G, P-methoxyphenol and diisodecyl phthalate in neopentyl glycol dimethacrylate is further added and mixed for 20 minutes. The mixture is uniformly formed into a 1.7 mm thick sheet between two PET films by using a press. A photosensitive layer (D) was obtained.

<Adjustment of Protective Sheet (EF)> On the other hand, the average roughness obtained by roughening the surface by a method by chemical polishing.
Tore Silicon SRX-244 (SRX-242-AC as a catalyst) solvent type was applied to the protective polyester film (F) with a thickness of 3.0 μ and thickness of 100 μ by a doctor blade to a thickness of 0.5 μ, and the temperature was kept at room temperature for one day. After standing, a solution of 5 parts of medium type ethyl cellulose having 45% ethoxy (manufactured by Dow) and 95 parts of toluene / isopropyl alcohol solution was applied on the applied surface with a bar coater and dried. A 2μ ethyl cellulose membrane (E) was obtained.

<Adjustment of Urethane Layer Film (CGH)> On a polyester film (H) having a thickness of 100 μ, a solvent type of Torre Silicone SR-244 and SRX-242-AC is applied with a doctor blade to a thickness of 0.4 μ, After left at room temperature for a day, a coating liquid (100 parts) of two-component urethane resin (Hybon 4251) and 4 parts of isocyanate (dismodul R) is applied and dried on a coating surface (G) with a bar coater. Then, a film (CGH) having a crosslinked urethane resin film (C) having a thickness of 20 μm was obtained.

<Preparation of photosensitive constituent layer> The photosensitive sheet (D) having a thickness of 1.7 mm is dried at 60 ° C. in a dryer.
Immediately after taking it out of the furnace, the PET film on one side is peeled off, and the polyester film (EF) for coating and protecting Etocel is melted on the surface of Etocel coated using a rubber roller on the surface of the photosensitive layer. Dressed
Further, the remaining PET film on one side was peeled off, and on the urethane film surface (C) of the urethane layer film (CGH), the surface of the photosensitive layer was fused with a rubber roller. As a result, a photosensitive constituent layer (II) having an Ethocel layer on one side and a urethane layer on one side was obtained. Then, from the plastics layer side having the urethane layer (C), the light intensity 3
A chemical lamp of mW / cm ² was exposed for 30 seconds from a distance of 5 cm. Then, the silicon-treated PET (GH) supporting the urethane layer (C) was easily peeled off to obtain a photosensitive constituent layer (III) having a urethane layer chemically bonded by light.

<Production of photosensitive sheet> Adhesion to a polyester film, thickness 1.25 mm, density 0.
32, elongation 115%, impact resilience 38%, compressive residual strain 4.6% (J
100 parts of a two-pack type acrylic ester adhesive (SK Dyne 1717) and 1.5 parts of isocyanate are mixed and applied onto a urethane foam (A) having a closed-cell shell (according to IS-K-6301). After drying, an adhesive layer (B) having a thickness of 30 to 40 μm was obtained. The photosensitive constituent layer (III) from which the polyester sheet has been peeled off is bonded onto this adhesive layer using a rubber roller.

When the protective polyester sheet (F) is peeled off from the photosensitive sheet (IV) thus obtained, the surface roughness ma
x. A photosensitive sheet (V) having a photosensitive layer surface coated with a non-adhesive ethyl cellulose film having a thickness of 3.0 μ and a thickness of 2 μ was formed. When an original image having a solid image is superposed on the photosensitive surface, the original image can be held on the photosensitive sheet in a state of good position operability and vacuum adhesion, and then, after irradiation with an ultraviolet lamp for 10 minutes, vacuum operation is performed. When the fixing original image was peeled off, the original image could be smoothly removed from the surface of the photosensitive layer without any resistance and without damaging the original image. The exposed part becomes transparent due to photobleaching,
The unexposed area was blue. The original pattern could be clearly discerned visually. Then add isopropyl alcohol 25
The photosensitive sheet is eluted by brushing with a 1,1,1-trichloroethane mixed solution containing 1% by weight for 2 minutes and dried in a drying oven at 50 ° C.
After drying for 20 minutes, a printing plate having a 0.8 mm relief image (floor 0.9 mm) which was faithful to the original image in which the exposed portion was colored in blue and had an excellent shoulder shape was obtained. The solid image part of this printing plate is cut to a length of 20 cm with a width of 2.5 cm,
The 180 ° peel strength at the interface between the photosensitive layer including the urethane layer chemically bonded by light with Tensilon (UTM-V) and the pressure-sensitive adhesive layer on the foam layer (200 mm / min pulling speed,
The adhesive strength was 1900 g / inch when measured under the condition of 20 ° C.).

Also, a printing plate having a relief image was pasted on a stack-type printing machine having a lattice type 360-line anilox, and Sakata Red Red-360H XA-55 ink (viscosity 20 seconds: sh
ell Cup-3) was used to print on a 100μ thick opal white polypropylene film for 7 hours at a printing speed of 400m / min, and peeling occurred at the interface between the urethane layer chemically bonded by the light of the printing plate and the adhesive layer. No abnormality was seen.

Example 2 <Adjustment of photosensitive layer> By the same operation as in Example 1, a photosensitive layer (D) having a thickness of 1.7 mm was obtained.

<Preparation of protective sheet (E′F ″)> Tore Silicon SRX-244 (SRX-242AC as a catalyst) solvent type is coated with a doctor blade on a 100 μm thick protective polyester film that is not chemically polished. After applying 0.4 μm and leaving it at room temperature for one day,
Furthermore, polyvinyl butyral resin (vinyl butyral / vinyl acetate / vinyl alcohol tripolymer, butyralization degree 65 ± 2 mol%, number average degree of polymerization 10
00-2000) 5 parts of toluene / isopropyl alcohol solution 95 parts of solution is applied by a bar coater and dried to 3 μm.
A polyvinyl butyral resin film of was obtained.

<Preparation of Urethane Layer (C′GH) Layer> 100 parts of the two-component urethane resin and isocyanate of Example 1 to saturated polyester resin (Hypon 7663, manufactured by Hitachi Chemical Polymer) and isocyanate (Takenate D-103).
A film having a crosslinked polyurethane layer (C ′) having a thickness of 30 μm was obtained by the procedure of Example 1 except that 4 parts were replaced.

<Production of Photosensitive Composition Layer> A photosensitive composition having a polyurethane layer chemically bonded by light by the same operation as in Example 1 except that the protective sheet and the urethane layer of Example 1 are replaced with the polyvinyl butyral resin film and the polyurethane film. A layer (III ') was obtained.

<Production of Photosensitive Sheet> A photosensitive sheet (IV ′) was obtained by the same operation as in Example 1.

When the protective polyester film (F) is peeled off from the photosensitive sheet (IV ′) thus obtained, the photosensitive layer having a photosensitive layer surface covered with a non-adhesive polyvinyl butyral film having a smooth thickness of 3 μm. The property sheet (V ') was formed. When a screen having a solid image is overlaid on the photosensitive surface, the original image can be held on the photosensitive sheet in a state of good position operability and vacuum adhesion,
Then, after irradiating the ultraviolet lamp for 8 minutes, the original image could be smoothly removed from the surface of the photosensitive layer without stopping the vacuum operation and damaging the original image. Next, the photosensitive sheet is blushed and eluted with 1,1,1-trichloroethane solution for 90 seconds and dried at 50 ° C for 30 minutes, which is faithful to the original image.
A printing plate with a relief image of 0.8 mm (floor 0.9 mm) was obtained.

By the same operation as in Example 1, the adhesive strength at the interface between the photosensitive layer including the urethane layer chemically bonded by light and the pressure-sensitive adhesive layer on the foam layer was 2000 g / inch.

Further, when printing was performed for 8 hours at a printing speed of 400 m / min by the same operation as in Example 1, no abnormal peeling was observed at the interface between the urethane layer chemically bonded by the light of the printing plate and the adhesive layer. It was

Example 3 <Adjustment of photosensitive layer> By the same operation as in Example 1, a photosensitive layer (D) having a thickness of 1.7 mm was obtained.

<Production of Photosensitive Constituent Layer> A photosensitive constituent layer (III ″) was obtained by the same operation as in Example 1.

<Production of Photosensitive Sheet> The urethane foam of Example 1 adhered to a polyester film in a thickness of 1.10 mm and a compression hardness of 0.8 kg / cm elongation 460
%, A photosensitive sheet (IV ″) was obtained by the same operation as in Example 1 except that the ethylene / vinyl acetate foam having a closed cell skin having a tensile strength of 23.5 kg / cm was used.

The protective polyester film was peeled off from the photosensitive sheet (IV ″) thus obtained, and an original image having a solid image as in Example 1 was used to expose and lava a printing plate having a relief image of 0.8 mm. Got

By the same operation as in Example 1, the adhesive strength at the interface between the photosensitive layer including the urethane layer chemically bonded to light and the adhesive layer on the foam layer was 2100 g / inch.

Also, the same operation as in Example 1 was performed for 7 hours under the condition of printing speed of 400 m / min. Abnormal peeling was observed at the interface between the urethane layer chemically bonded by the light of the printing plate and the adhesive layer. I couldn't see it.

Example 4 The same procedure as in Example 2 was carried out to obtain a photosensitive constituent layer (III). The SK Dyne 1717 adhesive was applied onto the ethylene / vinyl acetate foam of Example 3 and dried to obtain an adhesive layer of 30 to 40 μm.

The photosensitive constituent layer (III) from which the polyester sheet was peeled off was adhered to this adhesive layer using a rubber roller,
A photosensitive sheet (IV) was obtained.

The protective polyester film (F) was peeled off from the photosensitive sheet (IV) thus obtained, exposed and eluted using the original image having a solid image as in Example 1, and 0.8
A printing plate having a relief image of mm was obtained.

By the same operation as in Example 1, the adhesive strength at the interface between the photosensitive layer including the urethane layer chemically bonded by light and the pressure-sensitive adhesive layer on the foam layer was 1800 g / inch.

Further, the same operation as in Example 1 was carried out for 7 hours under the condition of printing speed of 400 m / min, and no abnormal peeling was observed at the interface between the urethane layer chemically bonded by the light of the printing plate and the adhesive layer. I couldn't do it.

Comparative Example A photosensitive sheet was obtained by the same procedure as in Example 1 except that the urethane layer chemically bonded by light was removed. Example 1
When the plate making and the adhesive strength were measured by the same operation as
It was g / inch.

Further, when the printing plate was printed under the condition of 400 m / min, the printing layer was peeled off between the photosensitive layer and the pressure-sensitive adhesive layer in 20 minutes, and printing could not be performed.

The present invention includes the following embodiments.

(1) (A) A support in which a polyurethane or polyolefin cell foam layer is provided on one side of a polyester film.

 (B) An adhesive layer provided on the foam layer of the support.

 (C) A polyurethane layer on the adhesive layer.

(D) A photosensitive layer which is provided on the polyurethane layer and which is composed of a polymer addition polymerizable unsaturated monomer having rubber elasticity and chemically bonded, and a photopolymerization initiator.

(E) a developer-soluble slip layer on the photosensitive layer, and (F) a laminate of sheet-like or film-like protective layers provided with or without a silicone type release layer on the slip layer. A certain photosensitive resin plate material for flexo.

(2) The plate material according to claim 1, comprising a support (A) having an adhesive layer interposed between a polyester film and a foamed cell of polyurethane or polyolefin.

(3) The plate material according to claim 1, which comprises a support (A) provided with a foam layer of polyurethane or polyolefin having a skin on the surface.

(4) The polymer having rubber elasticity is styrene-isoprene-styrene block copolymer, styrene-butadiene-
The plate material according to claim 1, which is selected from the group consisting of a styrene block copolymer, polybutadiene, butadiene-acrylonitrile, and urethane-modified polybutadiene.

(5) The plate material according to claim 1, wherein the photosensitive layer contains a dye that undergoes photobleaching and recoloring due to active radiation in the ultraviolet or visible region.

(6) After forming a polyurethane layer on a plastic layer having a silicone release layer, a sheet-shaped or film-shaped protective layer, pressure-bonded to the photosensitive layer surface having a slip layer,
The plate according to claim 1, which is obtained by irradiating the plastic layer side with actinic radiation, peeling off the plastic layer having the silicone release layer, and press-bonding the support (A) having the adhesive layer (B). Method of manufacturing wood.

(7) The method for producing a plate material according to claim 6, which is a photosensitive layer comprising a polymer having rubber elasticity, an addition-polymerizable unsaturated monomer, and a photopolymerization initiator.

(8) (The polymer having rubber elasticity) has rubber elasticity selected from any of styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, polybutadiene, butadiene-acrylonitrile, and urethane-modified polybutadiene. The method for producing a plate material according to claim 7, which is a polymer.

(9) The method for producing a plate material according to claim 6, wherein the photosensitive layer contains a dye that is photobleached by actinic radiation in the ultraviolet or visible region and recolors during development.

(10) The method for producing a plate material according to claim 6, which comprises a support (A) provided with a foam layer of polyurethane or polyolefin having an outer skin on the surface.

(11) The method for producing a plate material according to claim 6, which comprises a sheet-like or foam-like protective layer having a silicone type release layer on the slip layer.

[Brief description of drawings]

FIG. 1 is a view showing a manufacturing process of a photosensitive resin plate material (V) for flexo of the present invention. (G) is a silicone release layer, (H) is a plastic layer,
(C) is a polyurethane layer, (D) is a photosensitive layer, (E) is a slip layer, (F) is a pet, (B) is an adhesive layer, (A).
Is the support foam layer.

Claims (1)

[Claims] 1. A support having (A) a polyester film provided with a polyurethane foam layer or a polyolefin foam layer on one side thereof (B) an adhesive layer provided on the foam layer of the support (C) an adhesive layer Polyurethane layer (anchor layer) (D) A photosensitive layer provided on the polyurethane layer and chemically bonded to the layer, which comprises a polymer having rubber elasticity, an addition polymerizable unsaturated monomer and a photopolymerization initiator A laminate of (E) a developer-soluble slip layer on the photosensitive layer, and (F) a sheet-like or film-like protective layer provided on the slip layer with or without a silicone type release layer interposed therebetween. Photosensitive resin plate material for flexo.