JP2001183813A - Photosensitive resin laminated body and method of producing photosensitive resin printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photosansitive resin laminated body consisting of a transparent rubber sheet and a photosensitive resin layer for flexographic printing which can be easily produced with the current equipment and which can be developed with water. SOLUTION: The photosensitive resin laminated body comprises a transparent rubber sheet and a photosensitive resin layer for flexographic printing which contains a hydrophilic polymer and which can be developed with water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a photosensitive resin laminate comprising a water-developable photosensitive resin layer for flexographic printing and a transparent rubber sheet.

[0002]

2. Description of the Related Art A photosensitive flexographic printing plate is used as a printing material for a film, a label, an envelope, a cardboard, a paper bag and the like. Above all, in cardboard printing applications,
Usually, a printing plate having a plate thickness of 4 mm or more, often about 7 mm is required, but it is not economical to obtain a plate thickness only with the photosensitive resin layer, and it is heavy and poor in handling when performing plate making work. There are problems such as. Therefore, as the photosensitive resin layer, 3
It has been proposed to use a plate having a plate thickness of about 4 mm, and laminating an elastic material such as a rubber sheet, urethane foam material, sponge or the like having a thickness of about 4 mm below the plate, and use it for cardboard printing.

Heretofore, photosensitive resin layers for flexographic printing have been of a type which can be developed with an organic solvent such as trichloroethylene. As a method of bonding these photosensitive resin layers to a rubber sheet, an organic solvent such as trichloroethylene is used. Is applied to at least one of the surfaces of the photosensitive resin layer and the rubber sheet and bonded together.

In recent years, a water-developable photosensitive flexographic printing plate has been increasingly used in place of a photosensitive flexographic printing plate developable with an organic solvent such as trichloroethylene due to adverse effects on the environment. ing.

However, when the water-developable photosensitive resin layer is bonded to the rubber sheet, there is a problem that the method does not adhere to the rubber sheet by the same method as in the case of the solvent-developable photosensitive resin layer.

As a method of bonding a water-developable photosensitive resin layer to a rubber sheet, (1) a flexographic printing plate provided with an adhesive layer which dissolves or swells with an organic solvent under the water-developable photosensitive layer (JP-A-8-297369) ), (2) Flexographic printing plate provided with support, release layer, adhesive layer and photosensitive layer
No. 1-224276), and (3) a photosensitive resin laminate in which a synthetic rubber sheet and / or a photosensitive layer contains a softening agent (JP-A-11-95441).

[0007] However, in the above method (1), although it is possible to bond the rubber plate to the rubber sheet by a conventionally performed method, it is necessary to process a layer that dissolves or swells with an organic solvent. It is disadvantageous in production because the cost is increased for a photosensitive flexographic plate material that can be developed with a solvent. In the method (2), it is shown that the adhesive layer and the rubber sheet are useful because they have strong adhesive strength, but it is necessary to apply the adhesive layer and the release layer in manufacturing a printing plate material. This is disadvantageous because the cost increases. Further, in the method (3), it is shown that an organic solvent is brought into contact with the synthetic rubber sheet layer to dissolve or swell the surface, and a photosensitive layer is adhered to or adhered to the surface layer and laminated.
In some cases, the photosensitive layer in contact with the organic solvent is curled by swelling, making it difficult to adhere to the synthetic rubber sheet.
In addition, the photosensitive resin layer for flexographic printing in which the base resin contains a hydrophilic polymer, in particular, the photosensitive resin layer has a sea-island-type layer separation structure, and the island component is formed in the hydrophilic polymer constituting the sea component. In a photosensitive resin layer for flexographic printing in which a rubber component is dispersed, there is a problem that the photosensitive resin layer does not adhere to a synthetic rubber sheet.

[0008]

SUMMARY OF THE INVENTION In view of the above problems, the present invention has a good image reproducibility comprising a water-developable photosensitive resin layer for flexographic printing and a transparent rubber sheet, which can be easily manufactured with current equipment. It is an object to propose a photosensitive resin laminate.

[0009]

The photosensitive resin laminate of the present invention mainly has the following constitution in order to solve the above-mentioned problems. That is, it is a "photosensitive resin laminate comprising a photosensitive resin layer for flexographic printing in which the base resin contains a hydrophilic polymer and which can be subjected to water development, and a transparent rubber sheet".

The method for producing a photosensitive resin printing plate of the present invention mainly has the following constitution in order to solve the above problems. That is, "a photosensitive resin printing plate characterized in that a water-developable photosensitive resin layer containing a hydrophilic polymer as a base resin is bonded to a transparent rubber sheet with a solvent and then exposed. Method ".

[0011]

Embodiments of the present invention will be described below.

First, a method of laminating a water-developable photosensitive resin layer for flexographic printing in which the base resin contains a hydrophilic polymer and a transparent rubber sheet will be described.

When a support is provided on the photosensitive resin layer for flexographic printing, a solvent is applied to at least one of the transparent rubber sheet surface and the photosensitive resin layer surface in a state where the support is peeled off, and the two are adhered to each other.・ Adhere. In this state, the solvent is allowed to evaporate. The time required for evaporating the solvent may be several minutes to several tens of minutes.

Examples of the solvent used for the above adhesion include halogenated hydrocarbons such as chloroform, carbon tetrachloride, trichloroethane and trichloroethylene, aromatic hydrocarbons such as benzene, toluene and xylene, ethyl acetate and isopropyl acetate. Esters, acetone, ketones such as methyl ethyl ketone, tetrahydrofuran,
Examples thereof include ethers such as dioxane, but are not particularly limited.

Next, exposure is performed. Generally, first, the entire back surface of the photosensitive resin layer for flexographic printing is exposed from the transparent rubber sheet side to form a floor of the photosensitive resin layer. As the light source, 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, and the like, which can normally emit a wavelength of 300 to 400 nm, are used. Exposure after lamination with a transparent rubber sheet prevents the photosensitive resin layer from swelling and curling due to contact with a solvent during lamination, thereby preventing workability from deteriorating. Is a water-developable photosensitive resin layer containing a hydrophilic polymer for flexographic printing, in particular, the photosensitive resin layer has a sea-island-type layer-separated structure, and constitutes an island component in a hydrophilic polymer constituting a sea component. Good adhesiveness can also be obtained in the photosensitive resin layer for flexographic printing, wherein the rubber component is dispersed. Thereafter, a negative or positive original image film is adhered to the photosensitive resin layer from which the cover film has been peeled off, irradiated with ultraviolet light, and photocured by photopolymerization. Thus, 2
By performing stepwise exposure, high image reproducibility can be obtained. Note that the order of the two-stage exposure may be performed from any of them, and may be performed any number of times.

The water-developable photosensitive resin layer for flexographic printing according to the present invention is characterized in that a portion irradiated with light is photo-cured, and a portion that does not transmit light is water or an additive such as a surfactant added to water. Is a layer that can be developed with a liquid to which is added. A relief image can be formed on the support by eluted the uncured portion with a spray developing device or a brush type washing machine using water. In order to prevent the deterioration of the developer, the unexposed portion of the photosensitive resin layer may be partially removed by cutting before development. After drying, the printing plate material can be obtained by actinic light treatment. A plate material having such a layer, which has rubber elasticity and can use aqueous ink, and has a plate material hardness of 30 to 60 degrees in Shore A hardness is suitably used for flexographic printing.

Such a water-developable photosensitive resin layer for flexographic printing comprises a hydrophilic polymer and rubber as resin components, and further comprises a photopolymerizable unsaturated compound, and, if necessary, a photosensitizer and a heat polymerization inhibitor. Refers to a layer formed from a composition comprising an agent and the like, and these compositions are, for example, steel, aluminum,
It is generally provided on a support such as a polyester film at an arbitrary thickness to form a photosensitive resin layer.

Next, each component forming the photosensitive resin layer will be described.

First, each component forming the base resin will be described.

In the present invention, the hydrophilic polymer is 25 ° C.
A polymer that dissolves or disperses in water when immersed in water for 24 hours.

Examples of the hydrophilic polymer used in the present invention include polyamides and partially saponified polyvinyl acetates. Polyamides are mainly used due to the compatibility between the polymers or between the polymer and the photopolymerizable unsaturated compound. It is preferred to use. Examples of such a hydrophilic polyamide include a sulfonic acid group or a sulfonate group obtained by copolymerizing sodium 3,5-dicarboxybenzenesulfonate or the like as disclosed in JP-A-48-72250. A polyamide contained in the copolymer and a dicarboxylic acid having an ether bond in the molecule, a diamine, or an ether bond obtained by copolymerizing any one of cyclic amides as shown in JP-A-49-43465. Having polyamide, JP-A-50-76
No. 05, a polyamide containing basic nitrogen obtained by copolymerizing N, N′-di (γ-aminopropyl) piperazine and the like, and quaternizing these polyamides with acrylic acid or the like. Polyamide, JP-A-55-
No. 74537 proposes a molecular weight of 150 to 15
And a copolymerized polyamide containing a polyether segment of No. 00 and α- (N, N′-dialkylamino) -ε
Polyamide obtained by ring-opening polymerization of -caprolactam or ring-opening copolymerization of α- (N, N′-dialkylamino) -ε-caprolactam and ε-caprolactam.

Among these hydrophilic polyamides, copolymerized polyamides containing a polyether segment having a molecular weight of 150 to 1500, more specifically having a terminal amino group and having a polyether segment having a number average molecular weight of 15
A structural unit comprising polyoxyethylene of 0 to 1500 and an aliphatic dicarboxylic acid or diamine of 30 to 70;
A copolyamide containing by weight is preferably used.

These hydrophilic polyamides may be used alone or in combination of two or more.

The amount of the hydrophilic polyamide used is preferably from 3 to 40% by weight, more preferably from 5 to 20% by weight in the whole photosensitive resin composition. Within this range, the developability does not decrease and the form retention of the raw plate does not decrease, and the water resistance of the printing plate does not decrease and the printing durability does not deteriorate.

Specific examples of the rubber of the present invention include polybutadiene latex, natural rubber latex, styrene-butadiene copolymer latex, acrylonitrile-
Aqueous dispersion of butadiene copolymer latex, polychloroprene latex, polyisoprene latex, polyurethane latex, methyl methacrylate-butadiene copolymer latex, vinylpyridine polymer latex, butyl polymer latex, thiochol polymer latex, acrylate polymer latex, etc. Polymers obtained from latex, polymers obtained by copolymerizing other components such as acrylic acid and methacrylic acid with these polymers, and other general-purpose rubbers, those known as elastomers, specifically, butadiene Rubber, nitrile rubber, acrylic rubber, epichlorohydrin rubber, urethane rubber, isoprene rubber, styrene isoprene rubber, styrene butadiene rubber, ethylene-propylene copolymer, chlorinated polyethylene and the like.

By melting and mixing the above-mentioned hydrophilic polyamide and rubber, a base resin having a sea-island-shaped layer separation structure can be obtained. By having a sea-island layer separation structure, both the water developability of the printing plate material and the suitability of the printing plate for aqueous ink can be achieved. The sea-island layer-separated structure refers to a structure in which a rubber component constituting an island component is dispersed in a hydrophilic polyamide constituting a sea component. The shape and size of the island component are not particularly limited, but 5
When 0% by volume or more has an independent spherical shape having a diameter in the range of 0.1 to 50 μm, more preferably 0.1 to 20 μm, the water developability is improved, which is preferable.

The amount of rubber used is 1 in the total photosensitive resin composition.
It is preferably from 0 to 80% by weight, more preferably from 30 to 70% by weight. Within this range, the flexibility of the printing plate does not decrease and the developability does not decrease.

The total amount of the hydrophilic polyamide and the rubber is preferably 20 to 90% by weight, more preferably 50 to 80% by weight in the whole photosensitive resin composition. Within this range, the obtained plate surface will not have large adhesion, and the form retention of the plate will not be impaired.
In particular, the image reproducibility does not decrease.

A photopolymerizable unsaturated compound is added to these base resin components.

Specifically, as a monomer having a polyalkylene glycol, diethylene glycol di (meth)
Polyethylene glycol di (meth) acrylate such as acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipropylene glycol dimethacrylate, tripropylene glycol di (meth) acrylate, tetrapropylene glycol di (meth) ) Acrylates such as polypropylene glycol di (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, phenoxytriethylene glycol (meth) acrylate,
Phenoxypolyethylene glycol (meth) acrylates such as phenoxytetraethylene glycol (meth) acrylate and phenoxypentaethylene glycol (meth) acrylate, phenoxydipropylene glycol (meth) acrylate, phenoxytripropylene glycol (meth) acrylate, and phenoxytetrapropylene glycol (meth) ) Phenoxypolypropylene glycol (meth) acrylates such as acrylates, and other examples include polyethylene glycol polypropylene glycol di (meth) acrylate, cresyl polyethylene glycol (meth) acrylate, and nonylphenoxypolyethylene glycol (meth) acrylate.

As monomers having a hydroxyl group, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate, β -Hydroxy-β '-(meth) acryloyloxyethyl phthalate, 2-hydroxy-3-acryloxypropyl (meth) acrylate and the like.

As a monomer having a carboxyl group, β
-Carboxyethyl (meth) acrylate, mono (meth) acryloyloxyethyl succinate, monohydroxyethyl phthalate (meth) acrylate and the like.

As monomers having a phosphate group, 2- (meth) acryloyloxy acid phosphate, tris (acryloyloxy) phosphate, caprolactone-modified 2-acryloyloxyethyl acid phosphate, (meth) acryloyloxyethyl acid phosphate, caprolactone-modified 2 -(Meth) acryloyloxyethyl acid phosphate, diphenyl-2-
(Meth) acrylolyloxyethyl phosphate and the like. Here, “□□□ (meth) acrylate” means □□□ methacrylate or □□□ acrylate.

Among these, those having a polyalkylene glycol in the monomer structure, those having a carboxyl group, those having a hydroxyl group, and those having a phosphoric acid group are useful for exhibiting water developability.

The proportion of the photopolymerizable unsaturated compound in the photosensitive resin composition is preferably in the range of 10 to 80% by weight. More preferably, it is 10 to 60% by weight. The ratio of the photopolymerizable unsaturated compound in the photosensitive resin composition is 10% by weight.
If it is less than 1, sufficient image reproducibility cannot be obtained due to insufficient crosslinking density, and the ink tends to swell in a diluting solvent of the aqueous ink. Conversely, if the proportion of the photopolymerizable unsaturated compound in the photosensitive resin composition exceeds 80% by weight, the density of the crosslinked structure generated by photopolymerization becomes excessive, so that the plate-made relief becomes very brittle, Therefore, problems such as cracks occurring in the relief during printing occur.

As the photopolymerization initiator in the present invention, any conventionally known photopolymerization initiator can be used as long as it can polymerize a 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. For example, there are benzoin alkyl ethers, benzophenones, anthraquinones, benzyls, acetophenones, diacetyls and the like. These photopolymerization initiators are used in an amount of 0.0
It can be used in the range of 1 to 10% by weight.

In the photosensitive resin composition of the present invention, various additives such as ethylene glycol, diethylene glycol, triethylene glycol, glycerin, trimethylolpropane, and trimethylolethane may be used as a compatibilizer between the hydrophilic polyamide and the photopolymerizable unsaturated compound. Polyhydric alcohols, N-ethyl-
It is also possible to add p-toluenesulfonamide, N-butylbenzenesulfonamide, N-methylbenzenesulfonamide and the like. These polyhydric alcohols,
The sulfonamide-based compound has the effect of increasing the flexibility of the photopolymerized portion and preventing the occurrence of relief cracks. Such polyhydric alcohols and sulfonamide compounds can be used in a range of 30% by weight or less based on the photosensitive resin composition.

In order to improve the thermal stability of the photosensitive resin composition of the present invention, a conventionally known polymerization inhibitor can be used. Preferred thermal polymerization inhibitors include phenols, hydroquinones, catechols and the like.
These thermal polymerization inhibitors are added in an amount of 0.001 to the total amount of the composition.
It can be used in the range of ５5% by weight.

Dyes, pigments, surfactants, defoamers,
UV absorbers, fragrances and the like can be added.

As a method for producing the photosensitive resin composition of the present invention, the above-mentioned components can be kneaded in a kneading facility to obtain a photosensitive resin composition. Examples of the kneading equipment include, but are not particularly limited to, a twin-screw extruder, a single-screw extruder, a kneader, and a Banbury mixer.

Using the photosensitive resin composition, a support extruded with an adhesive is melted and extruded by an extruder.
A photosensitive resin printing plate material can be obtained by bringing a cover film coated with an anti-adhesion layer into close contact with the photosensitive layer.
Alternatively, a photosensitive resin printing plate material can be obtained by sandwiching the photosensitive resin composition between the support and the cover film and pressing the photosensitive resin composition to a required thickness such as with a hot press. As the support, a metal such as steel, stainless steel or aluminum, or a plastic sheet such as polyester is preferably used. The thickness of the photosensitive resin layer is 0.01 to 1
Preferably, it is formed to a thickness of 0 mm. If it is less than 0.01 mm, the relief depth is insufficient, and it cannot be used as a flexographic printing plate. If it is larger than 10 mm, the plate material becomes very heavy, and it is practically difficult to use it as a printing plate.

The transparent rubber sheet used in the present invention has a thickness of 30 in order to effectively cure the photosensitive resin layer with light.
It is preferable that the light transmittance in a wavelength region of 0 to 400 nm is 50% or more per 1 mm in thickness. In addition, while maintaining sufficient resilience for cardboard printing, from the viewpoint of obtaining sufficient elasticity for cardboard printing, Shore A hardness is 5 to 70.
Degrees, more preferably 10 to 50 degrees.

As such a transparent rubber sheet, specifically, polymers such as isoprene, styrene, butadiene acrylonitrile and copolymers thereof, transparent polyurethane rubber, transparent nylon or a mixture thereof are used as rubber components. it can. If necessary, a photopolymerization initiator, a photopolymerizable unsaturated compound, a plasticizer, a polymerization inhibitor, and the like can be added to the rubber component. The thickness of the transparent rubber sheet is preferably 1 to 10 mm, more preferably 3 to 9 mm. By setting the ratio within this range, a sufficient restoring force for flexographic printing can be maintained, and unnecessary printing pressure can be prevented.

[0044]

The present invention will be described in more detail with reference to the following examples.

(Preparation of a photosensitive resin printing plate) As a water-developable photosensitive flexographic plate material, a hydrophilic polyamide (ε-caprolactam / equimolar salt of hexamethylenediamine and adipic acid / α, ω-diamino) was used as a resin component. 20 parts of propyl polyoxyethylene (number average molecular weight: 1000) and equimolar salt of adipic acid = 20/20/60 (weight ratio) copolymerized polyamide) and carboxylated nitrile butadiene rubber (Nipol 1072 manufactured by Zeon Corporation) 20 parts and partially crosslinked type nitrile butadiene rubber (Nipol DN
214 20 parts of Nippon Zeon Co., Ltd.) and 40 parts of butadiene rubber (Nipol BR-1220L Nippon Zeon Co., Ltd.) are melt-mixed for 10 minutes, and then 0.2 part of m-phenylenebismaleimide is added, and the total mixing time is added. A polymer blend was obtained in 15 minutes. In addition, the form of this polymer blend was measured using a scanning electron microscope (JSM-T300, manufactured by JEOL Ltd., under measurement conditions:
As a result of observation with a backscattered electron composition image, the hydrophilic polyamide has a sea component and a rubber has an island component, and has a sea-island-type layer separation structure, and the diameter of the island component is in the range of 0.5 to 4 μm. It was confirmed that. 40 parts of the polymer blend thus obtained and 2 parts by weight of sodium methylenebisnaphthalenesulfonate were kneaded with a closed mixer at 160 ° C. for 3 minutes, and then a butadiene latex (Nipol LX111) was mixed.
NF nonvolatile content 55%, solid content conversion 10 parts, carboxy-modified acrylic butadiene latex (DM811 nonvolatile content 50%, manufactured by Dainippon Ink and Chemicals, Inc.) solid content 15 parts, and polymerizable unsaturated compound As phenoxy polyethylene glycol acrylate 2
0 parts by weight and glycerin diglycidyl diacrylate 12
1 part by weight of dimethyl benzyl ketal as a photoinitiator.
Kneaded at 40 ° C. for 10 minutes.

The obtained photosensitive resin composition was adjusted to 125 μm
Sandwiched between a substrate in which a polyester-based adhesive was applied to a polyethylene terephthalate film in advance and a cover film in which a polyvinyl alcohol-based polymer was applied in advance to a 100 μm polyethylene terephthalate film.
The thickness of the photosensitive resin layer is 3 m with a press machine heated to 50 ° C.
m to obtain a photosensitive resin plate material for flexographic printing.

Example 1 The substrate of the photosensitive resin plate material was peeled off to expose the photosensitive resin layer. Peel off one of the support films of the transparent rubber sheet "Okaflex" (manufactured by Tokyo Ohka Co., Ltd.) and apply the above-mentioned photosensitive resin plate material for flexographic printing with the photosensitive resin layer exposed while applying trichloroethylene on this surface. And
The photosensitive resin layer was placed on the lower side and allowed to stand for about 5 minutes to obtain a photosensitive resin laminate. During this time, no curling of the photosensitive resin layer was observed.

Next, the photosensitive resin laminate was exposed to ultraviolet rays for 6 minutes from the transparent rubber sheet side of the photosensitive resin laminate using a high-intensity chemical lamp exposure machine manufactured by JEOL Ltd. to perform back exposure. Then
The cover film on the photosensitive resin layer side of the photosensitive resin laminate having been back-exposed was peeled off, a negative film was brought into close contact with the vacuum film, and pattern exposure was performed for 4 minutes by the same exposure machine. After the exposure, the negative film was removed, and development was carried out using a transport developing machine manufactured by JEOL Ltd. at a temperature adjusted to 55 ° C. Then, after drying with hot air at 50 ° C. for 30 minutes, exposure was performed again from the photosensitive layer side for 4 minutes to obtain a flexographic printing plate having a relief depth of 1.2 mm. The image reproducibility was good, and an independent point of 200 μm was reproduced.

The adhesive strength between the photosensitive resin layer of the photosensitive resin laminate and the transparent rubber sheet was measured at 20 ° C. and a width of 10 mm.
When a peel test was performed on a test piece of 500 mm at a tensile speed of 500 mm / min, the adhesive strength was 10 N / cm.

Example 2 A photosensitive resin laminate obtained in the same manner as in Example 1 was used.
Back exposure was performed by irradiating ultraviolet rays for 20 seconds from the transparent rubber sheet side with a high-brightness chemical light exposure machine manufactured by JEOL Ltd. Next, the cover film on the photosensitive resin layer side of the back-exposed photosensitive resin laminate is peeled off, a negative film is adhered in vacuum, pattern exposure is performed for 4 minutes by the same exposure machine, and again 5 minutes from the transparent rubber sheet side. Back exposure was performed for 40 seconds.
The unexposed portion of the photosensitive resin layer was partially cut and removed, developed, dried, and exposed in the same manner as in Example 1 to obtain a relief depth of 1.2 m.
m flexographic printing plates were obtained. Good image reproducibility, 20
An independent point of 0 μm was reproduced.

The adhesive strength between the photosensitive resin layer of the photosensitive resin laminate and the transparent rubber sheet was 10 N / cm.

Comparative Example 1 A photosensitive resin laminate was produced in the same manner as in Example 1 except that the substrate of the photosensitive resin plate material was peeled off, the entire back surface of the photosensitive resin layer was exposed, and then bonded to a transparent rubber sheet. Was made,
At the time of bonding, the photosensitive resin layer in a portion in contact with the solvent swelled significantly and curled, resulting in poor workability and no adhesion.

Comparative Example 2 The substrate of the photosensitive resin plate material was peeled off, and the adhesive “NORIO” was used.
Example 1 except that (Sumitomo 3M) was applied.
A photosensitive resin laminate was obtained in the same manner as described above. Although the obtained photosensitive resin laminate had poor thickness accuracy, a flexographic printing plate was prepared in the same manner as in Example 1. Developing defects were partially observed in this printing plate, and only a part of an independent point of 200 μm was reproduced.

[0054]

The photosensitive resin laminate of the present invention improves the adhesive strength between a water-developable photosensitive resin layer containing a hydrophilic polymer and a transparent rubber sheet layer for flexographic printing.
It is useful for using a water-developable photosensitive resin for flexographic printing in applications such as cardboard. In addition, a flexographic printing plate that can be easily manufactured with existing equipment, has good workability, and has high image reproducibility can be provided.

Claims (4)

[Claims] 1. A photosensitive resin laminate comprising a water developable photosensitive resin layer containing a hydrophilic polymer as a base resin and a transparent rubber sheet. 2. A water-developable photosensitive resin layer for a flexographic printing wherein the base resin contains a hydrophilic polymer has a sea-island layer separation structure, and the hydrophilic polymer constituting the sea component contains an island component. The photosensitive resin laminate according to claim 1, wherein a rubber component constituting the photosensitive resin is dispersed. 3. A photosensitive resin printing plate, wherein a water-developable photosensitive resin layer containing a hydrophilic polymer as a base resin is laminated to a transparent rubber sheet and a solvent, and then exposed. Manufacturing method. 4. A water-developable photosensitive resin layer for a flexographic printing wherein the base resin contains a hydrophilic polymer has a sea-island-type layer-separated structure, and an island component is contained in the hydrophilic polymer constituting the sea component. The method for producing a photosensitive resin printing plate according to claim 3, wherein the rubber component constituting (a) is dispersed.