JP2016210104A - Flexographic printing plate having adhesive layer, flexographic printing plate original plate having adhesive layer, laminated structure and method for producing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: an inexpensive flexographic printing plate which has excellent workability, causes no peeling of a plate even if laser engraving or printing is performed at high speed revolutions, causes no peeling of a printing plate even if washed, can easily peel off the printing plate from a plate cylinder after printing and can reuse the printing plate and a cushion tape; a flexographic printing plate original plate; a laminated structure; and a method for producing the same.SOLUTION: There is provided a flexographic printing plate in which a rear surface of a support on the opposite side of a relief layer or on the opposite side of a surface on which a relief forming layer is composed of a polyethylene terephthalate. The flexographic printing plate has an adhesive layer on at least a part on the rear surface and the adhesive layer has a water droplet contact angle of 77-93 degrees.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flexographic printing plate with an adhesive layer, a flexographic printing plate precursor with an adhesive layer and a laminated structure, a method for producing a flexographic printing plate with an adhesive layer, a method for producing a flexographic printing plate precursor with an adhesive layer, and a laminated structure. It relates to a manufacturing method.

  Flexographic printing plates with a flexible relief layer made of resin or rubber have relatively soft printing protrusions (image areas) and can follow various shapes. It is used for printing on a printing medium with a certain thickness.

Such a flexographic printing plate is placed on the circumferential surface of a cylindrical plate cylinder, and while rotating the plate cylinder, the flexographic printing plate is brought into contact with the substrate to be printed. The ink is transferred directly from the surface to the printing medium to form an image on the printing medium.
Laser engraving is used to form the relief layer of the flexographic printing plate. When engraving the relief layer, the flexographic printing plate precursor is placed on the peripheral surface of the plate cylinder and the plate cylinder is rotated. Meanwhile, a relief layer is formed by irradiating the relief forming layer with laser light to remove a part of the relief forming layer.

  In general, when a flexographic printing plate or a flexographic printing plate precursor is placed on a plate cylinder, a double-sided tape (cushion tape) having cushioning properties is used. By having a cushion layer between the flexographic printing plate and the plate cylinder, the printing pressure applied to the image portion of the flexographic printing plate is dispersed during printing, and the printing pressure is made uniform and printed on the substrate. Image reproducibility can be improved.

However, when a flexographic printing plate or a flexographic printing plate precursor is placed on a plate cylinder, if only a cushion tape is used for adhesion between the flexographic printing plate or the flexographic printing plate precursor and the plate cylinder, When laser engraving is performed at a high speed, there is a problem that the flexographic printing plate or the flexographic printing plate precursor is detached from the plate cylinder by rotation.
In particular, during printing, ink penetrates between the flexographic printing plate and the cushion tape from the joint portion of the flexographic printing plate wound around the plate cylinder, and the cushion tape is attached to the end of the flexographic printing plate. In some cases, the adhesive strength of the resin is reduced and the film is easily peeled off.

  In addition, when washing ink on the flexographic printing plate after printing, the cleaning liquid penetrates between the flexographic printing plate and the cushion tape from the joints of the flexographic printing plate, and the cushion at the end of the flexographic printing plate. There was a problem that the adhesive strength with the tape was lowered and the tape was peeled off.

Therefore, in Patent Document 1, the winding start and end of a printing plate (printing plate precursor) are thinned in advance as an overlap, and the start and end are overlapped and welded to improve the joint strength of the seam portion. Thus, it is described that the flexographic printing plate or the flexographic printing plate precursor can be prevented from coming off the plate cylinder by rotation when printing is performed at high speed or when laser engraving is performed at high speed.
In addition, it is considered that the configuration in which the start end and the end end are overlapped and welded in this way can prevent the ink and the cleaning liquid from entering from the joint portion.

JP 2010-076243

  However, the configuration in which the winding start end and end of the flexographic printing plate or flexographic printing plate precursor are thinned in advance as an overlap allowance and the start end and end are overlapped and welded is the end of the flexographic printing plate (flexographic printing plate precursor). There was a problem that work of the part was troublesome and workability was poor. In addition, since the start and end are welded together, it is difficult to remove the flexographic printing plate from the plate cylinder while maintaining the original shape, and the removed flexographic printing plate cannot be reused. It was.

  Also, in order to prevent the flexographic printing plate (flexographic printing plate precursor) from coming off the plate cylinder due to high-speed rotation, the peeling force between the flexographic printing plate and the plate cylinder is increased, that is, the adhesive force of the cushion tape is increased. It is possible. However, if the adhesive strength of the cushion tape is too high, the flexographic printing plate and / or the cushion tape is damaged at the time of peeling, and there is a problem that the flexographic printing plate and the cushion tape cannot be reused.

  An object of the present invention is to solve such problems of the prior art, and is excellent in workability. Even if laser engraving or printing is performed at high speed, the plate does not peel off, and the printing plate can be obtained even after washing. After printing, the printing plate can be easily peeled off from the plate cylinder, and the printing plate and cushion tape can be reused. Inexpensive flexographic printing plate with adhesive layer, flexographic printing plate precursor with adhesive layer, laminated structure, and these It is in providing the manufacturing method of.

As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that the back surface of the support opposite to the surface on which the relief layer or the relief forming layer is formed is made of polyethylene terephthalate, and is at least partly on the back surface. The adhesive layer has a water droplet contact angle of 77 ° to 93 °, so that the workability is excellent and the plate does not peel off even if laser engraving or printing is performed at high speed, and the plate is washed. However, the printing plate was not peeled off, and after printing, the printing plate could be easily peeled off from the plate cylinder, and the printing plate and cushion tape could be reused and made inexpensive, and the present invention was completed.
That is, the present invention provides a flexographic printing plate with an adhesive layer, a flexographic printing plate precursor with an adhesive layer, a laminated structure, and a production method thereof, having the following configurations.

(1) a flexographic printing plate having a support and a relief layer formed on the support;
An adhesive layer formed on at least a part of the back surface of the flexographic printing plate support opposite to the surface on which the relief layer is formed;
The back surface of the support is composed of polyethylene terephthalate,
A flexographic printing plate with an adhesive layer, wherein the contact angle of the water droplet of the adhesive layer is 77 to 93 degrees.
(2) Flexo with adhesive layer according to (1), wherein the adhesive layer has a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group Printed version.
(3) a flexographic printing plate precursor having a support and a relief-forming layer formed on the support;
An adhesive layer formed on at least a part of the back surface of the support of the flexographic printing plate precursor opposite to the surface on which the relief forming layer is formed;
The back surface of the support is composed of polyethylene terephthalate,
A flexographic printing plate precursor with an adhesive layer, wherein the water droplet contact angle of the adhesive layer is 77 to 93 degrees.
(4) Flexo with adhesive layer according to (3), wherein the adhesive layer has a resin containing at least one of (meth) acryloyloxy group, halogen group, carboxy group, hydroxyl group, silyl group, and epoxy group A printing plate master.
(5) a cylindrical sleeve;
A cushion tape layer having adhesiveness on both sides, wound and laminated on the circumferential surface of the sleeve;
An adhesive layer laminated on at least a part of the cushion tape layer;
A support that is at least partially laminated on the adhesive layer;
A relief layer or a relief forming layer formed on the support,
The back surface of the support, which is the surface on the adhesive layer side, is composed of polyethylene terephthalate,
A laminated structure in which the water droplet contact angle of the adhesive layer is 77 to 93 degrees.
(6) The laminated structure according to (5), wherein the adhesive layer has a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group.
(7) The laminated structure according to (5) or (6), wherein the adhesive layer is formed on two circumferential sides of the back surface of the support.
(8) The laminated structure according to (7), wherein the width of the adhesive layer in the circumferential direction is 1 mm to 100 mm.
(9) A flexographic printing plate having a support and a relief layer formed on the support and having a back surface opposite to the surface on which the relief layer is formed is made of polyethylene terephthalate is prepared. Printing plate preparation process,
An adhesive layer forming step of applying an undercoat liquid to be an adhesive layer on at least a part of the back surface of the support of the flexographic printing plate, and forming an adhesive layer;
The manufacturing method of the flexographic printing plate with an adhesive layer whose water drop contact angle of the adhesive layer formed at an adhesive layer formation process is 77 degree | times-93 degree | times.
(10) The undercoating liquid contains a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group. A method for producing a printing plate.
(11) The undercoat liquid contains a resin and a solvent,
The solvent is at least one selected from the group consisting of cyclohexane, ethanol, ethyl acetate, isobutyl acetate, vinyl acetate, methyl alcohol, toluene, xylene, ethylbenzene, and methyl isobutyl ketone;
The manufacturing method of the flexographic printing plate with an adhesive layer as described in (10) whose density | concentration of resin is 0.1 mass%-10 mass%.
(12) A flexographic printing plate having a support and a relief forming layer formed on the support, the back surface of the support being opposite to the surface on which the relief forming layer is formed is composed of polyethylene terephthalate A printing plate precursor preparation process for preparing an original plate;
An adhesive layer forming step of applying an undercoat liquid to be an adhesive layer on at least a part of the back surface of the support of the flexographic printing plate precursor, and forming an adhesive layer;
A method for producing a flexographic printing plate precursor with an adhesive layer, wherein the water droplet contact angle of the adhesive layer formed in the adhesive layer forming step is 77 to 93 degrees.
(13) The undercoat liquid comprises a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group. A method for producing a printing plate.
(14) The undercoat liquid contains a resin and a solvent,
The solvent is at least one selected from the group consisting of cyclohexane, ethanol, ethyl acetate, isobutyl acetate, vinyl acetate, methyl alcohol, toluene, xylene, ethylbenzene, and methyl isobutyl ketone;
The method for producing a flexographic printing plate precursor with an adhesive layer according to (13), wherein the concentration of the resin is 0.1% by mass to 10% by mass.
(15) The flexographic printing plate with an adhesive layer produced by the method for producing a flexographic printing plate with an adhesive layer according to any one of (9) to (11), or according to any one of (12) to (14) A flexographic printing plate precursor with an adhesive layer produced by a method for producing an flexographic printing plate precursor with an adhesive layer is wound around a circumferential surface of a cylindrical sleeve via a cushion tape having adhesiveness on both sides, and laminated structure A manufacturing method of a laminated structure for manufacturing an object.

  According to the present invention, it is excellent in workability, the plate does not peel off even when laser engraving or printing is performed at high speed, the printing plate does not peel off even after washing, and the printing plate can be easily removed from the plate cylinder after printing. The printing plate and the cushion tape can be reused, and an inexpensive flexographic printing plate with an adhesive layer, an flexographic printing plate precursor with an adhesive layer, a laminated structure, and a production method thereof can be provided.

FIG. 1 (A) is a schematic top view showing an example of a flexographic printing plate with an adhesive layer according to the present invention, and FIG. 1 (B) is a cross-sectional view taken along line BB in FIG. 1 (A). It is a schematic sectional drawing which shows an example of the flexographic printing plate precursor with an adhesive layer which concerns on this invention. FIG. 3A is a schematic cross-sectional view showing an example of a laminated structure according to the present invention, and FIG. 3B is a partially enlarged view showing a part of FIG. It is the schematic for demonstrating the laminated structure of this invention. It is a figure which shows notionally the principal part of the flexographic printing apparatus using the laminated structure which concerns on this invention. It is a figure which shows notionally the calendar roll for producing a flexographic printing plate precursor.

Hereinafter, the flexographic printing plate with an adhesive layer, the flexographic printing plate precursor with the adhesive layer, the laminated structure, and the production method thereof according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments.
In the present specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.

[Flexographic printing plate with adhesive layer]
The flexographic printing plate with an adhesive layer according to the present invention includes a support, a flexographic printing plate having a relief layer formed on the support, and a surface of the support of the flexographic printing plate on which the relief layer is formed. With an adhesive layer formed on at least a part of the back surface on the opposite side, the back surface of the support is made of polyethylene terephthalate, and the water droplet contact angle of the adhesive layer is 77 to 93 degrees It is a flexographic printing plate.
Below, the structure of the flexographic printing plate with an adhesive layer according to the present invention will be described in detail based on the attached drawings.

  FIG. 1 (A) is a top view schematically showing an example of a flexographic printing plate with an adhesive layer according to the present invention, and FIG. 1 (B) is a cross-sectional view taken along line BB of FIG. 1 (A). .

  As shown in FIG. 1 (A) and FIG. 1 (B), a flexographic printing plate 10 with an adhesive layer, which is an example of a flexographic printing plate with an adhesive layer according to the present invention, is formed on a support 12 and a support 12. A flexographic printing plate 11 having a relief layer 14 formed thereon, and an adhesive layer 16 formed on at least a part of the back surface of the support 12 of the flexographic printing plate 11.

  The support 12 of the flexographic printing plate 11 is a part for supporting the relief layer 14, preferably a film-like material, and at least the back surface opposite to the surface on which the relief layer 14 is formed is polyethylene terephthalate ( PET). That is, the surface of the support 12 on which the adhesive layer 16 is formed is made of PET.

The material for forming the support 12 is not particularly limited as long as at least the back surface is formed of PET. A PET film may be used as the support 12 or another film-like material and a PET film are laminated. The laminated product may be used as a support.
In the case of using a laminate of a PET film and another film-like material as the support 12, examples of the material for forming the film-like material include metals such as steel, stainless steel, and aluminum; polyester (PEN (polyethylene naphthalate), PBT) (Polybutylene terephthalate), PAN (polyacrylonitrile)), polyvinyl chloride, and other plastic resins; synthetic rubbers such as styrene-butadiene rubber, nitrile-butadiene rubber, ethylene propylene rubber, and butyl rubber; plastic resins reinforced with glass fibers ( Epoxy resin, phenol resin, etc.).
It is preferable to use a PET film as the support 12 from the viewpoints of being able to be formed thin and resistant to elongation (high dimensional stability).

  The thickness of the support 12 is not particularly limited, but is preferably 60 μm to 250 μm and more preferably 80 μm to 200 μm from the viewpoints of flexibility, strength and the like.

The relief layer 14 of the flexographic printing plate 11 is the same as the relief layer used in the conventional flexographic printing plate, and has irregularities formed on the surface. During printing, ink is attached to the convex portions to be printed. This is a part that is transferred to a body and reproduces an image such as characters and figures on a printing medium.
The relief layer 14 is formed on one surface of the support 12.

Specifically, as shown in FIGS. 1 (A) and 1 (B), the relief layer 14 is formed in a convex shape, and an image portion 14a that applies ink during printing and transfers the ink to a printing medium. And a non-image portion 14b which is formed in a concave shape and does not receive ink during printing.
The image part 14a and the non-image part 14b are formed in a predetermined shape according to the image to be printed.
The image portion 14a is composed of a solid portion to be printed and / or a large number of convex small dots by transferring ink entirely, and by changing the size and density of the small dots. , Comprising a halftone dot portion expressing the gradation (gradation) of the image printed on the printing medium.
Note that the height of the image portion 14a (depth of the non-image portion 14b), the shape, size, density, etc. of the small dots in the halftone dot portion are not particularly limited, depending on the image to be printed, printing conditions, and the like. What is necessary is just to set suitably.

Here, in the present invention, the “relief layer” means a layer engraved by laser, and the layer before laser engraving is called “relief forming layer”. That is, a “relief layer” is a layer after laser engraving a “relief forming layer” of a flexographic printing plate precursor described later.
The material for forming the relief layer (relief forming layer) will be described in detail later.

The adhesive layer 16 is a layer having an adhesive property with a cushion tape layer 34 described later, which is formed on at least a part of the back surface of the support 12 of the flexographic printing plate 11.
In the illustrated example, the adhesive layer 16 is formed in a region having a predetermined width from each of the two opposing side edges on the back surface of the support. That is, the adhesive layer 16 extends in a direction parallel to the end side and is formed in a rectangular shape having a predetermined width in a direction perpendicular to the end side.

Here, in the present invention, the contact angle of the adhesive layer 16 with water (hereinafter referred to as “water droplet contact angle”) is 77 degrees to 93 degrees.
By setting the water droplet contact angle of the adhesive layer 16 within this range, when the flexographic printing plate 10 with the adhesive layer is laminated on the cushion tape layer 34 described later, the flexographic printing plate 10 with the adhesive layer and the cushion tape layer 34 The adhesive force can be in an appropriate range, and the flexographic printing plate 11 does not peel off even when printing is performed at high speed or washed, and the flexographic printing plate can be easily removed from the cushion tape layer 34 after printing. 11 can be peeled off. Therefore, the flexographic printing plate 11 and the cushion tape layer 34 can be reused.
In addition, since only the adhesive layer 16 that can be formed by application is formed and the processing and welding of the end portions are unnecessary, the workability is excellent and the cost is low.
These points will be described in detail later.

  In addition, the water droplet contact angle of the adhesive layer is such that a 3 mm diameter pure water droplet is dropped on the surface of the adhesive layer, and the angle formed by the surface and the water droplet after 20 seconds is determined by a contact angle measuring device (FACE contact angle meter CA). -X).

The material for forming the adhesive layer 16 is not particularly limited as long as the water droplet contact angle on the surface of the adhesive layer can be 77 to 93 degrees, but the PET constituting the support 12 and the cushion tape layer 34 are not limited. It is preferable to include a resin containing at least one of (meth) acryloyloxy group, halogen group, carboxy group, hydroxyl group, silyl group, epoxy group, etc. Among them, it is more preferable to include a resin having a (meth) acryloyloxy group, a halogen (especially chlorine) group, or an epoxy group. The (meth) acryloyloxy group means an acryloyloxy group or a methacryloyloxy group. Similarly, (meth) acrylic acid means acrylic acid or methacrylic acid, and (meth) acrylate means acrylate. Or means methacrylate.
The reason why the adhesion is thus good is that the cushion tape has a resin containing at least one of (meth) acryloyloxy group, halogen group, carboxy group, hydroxyl group, silyl group, epoxy group and the like. This is considered to be because the adhesion to the acrylic resin or the like that is the material of the pressure-sensitive adhesive layer or the adhesion to the PET surface constituting the support 12 is improved.
Specifically, for example, by having a polar resin such as a (meth) acrylic acid polymer or a chlorinated polyolefin, a polar group is added to the PET surface, and an acrylic resin or the like that is a material of the adhesive layer of the cushion tape It is thought that adhesion improves. Moreover, it is thought that adhesiveness with PET surface improves by having resin which reacts with PET, such as an epoxy resin.
Therefore, it is particularly preferable that the material for forming the adhesive layer 16 includes a (meth) acrylic acid polymer and / or chlorinated polyolefin that is a polar resin, and an epoxy resin that is a resin that reacts with PET.

Here, in the illustrated example, the adhesive layer 16 is formed on each of the two opposite side edges of the back surface of the support 12, but the present invention is not limited to this. It may be formed on each of the two edge sides, or may be formed on the entire back surface of the support 12.
In addition, when laminating | stacking on the cushion tape layer 34, in order to suppress peeling from the cushion tape layer 34 more suitably, it is preferable to provide the adhesive layer 16 at least on the end side of the back surface of the support 12.

  Further, when the adhesive layer 16 is provided on the end side of the back surface of the support 12 as in the illustrated example, the width in the direction perpendicular to the end side is preferably 1 mm to 100 mm, and 3 mm to 50 mm. More preferably, it is 5 mm-20 mm.

  The thickness of the adhesive layer 16 is not particularly limited, but is preferably 0.1 μm to 50 μm, and more preferably 0.5 μm to 25 μm.

[Flexographic printing plate precursor with adhesive layer]
The flexographic printing plate precursor with an adhesive layer according to the present invention comprises a support, a flexographic printing plate precursor having a relief forming layer formed on the support, and a relief forming layer of the support of the flexographic printing plate precursor. An adhesive layer formed on at least a part of the back surface opposite to the surface to be formed, the back surface of the support is made of polyethylene terephthalate, and the water droplet contact angle of the adhesive layer is 77 ° to 93 °. It is a flexographic printing plate precursor with an adhesive layer.
Hereinafter, the configuration of the flexographic printing plate precursor with an adhesive layer according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a cross-sectional view schematically showing an example of a flexographic printing plate precursor with an adhesive layer according to the present invention.
As shown in FIG. 2, the flexographic printing plate precursor 20 with the adhesive layer includes a support 12, a flexographic printing plate precursor 21 having a relief forming layer 22 formed on the support 12, and a flexographic printing plate precursor 21. And an adhesive layer 16 formed on at least a part of the back surface of the support 12.
As shown in FIG. 2, the flexographic printing plate precursor 20 with an adhesive layer has the above-described adhesion except that it has a relief forming layer 22 that is a layer before engraving instead of the relief layer 14 that is a layer after engraving. It has the same configuration as the layered flexographic printing plate 10.

Here, like the above-mentioned flexographic printing plate 10 with an adhesive layer, the adhesive layer 16 of the flexographic printing plate precursor 20 with an adhesive layer of the present invention has a water droplet contact angle of 77 to 93 degrees.
Even in the flexographic printing plate precursor before engraving, the adhesive force between the flexographic printing plate precursor 20 with the adhesive layer and the cushion tape layer 34 is within an appropriate range by having the adhesive layer 16 having a water droplet contact angle of 77 to 93 degrees. Therefore, when laminating the flexographic printing plate precursor 20 with an adhesive layer on the cushion tape layer 34 and performing laser engraving, the flexographic printing plate precursor 21 does not peel off even when rotated at a high speed.
In addition, since only the adhesive layer 16 that can be formed by application is formed and the processing and welding of the end portions are unnecessary, the workability is excellent and the cost is low.
These points will be described in detail later.

[Laminated structure]
The laminated structure according to the present invention is laminated on at least a part of a cylindrical sleeve, a cushion tape layer having adhesiveness on both sides, wound around the circumferential surface of the sleeve, and laminated. An adhesive layer, a support that is at least partially laminated on the adhesive layer, and a relief layer or a relief forming layer that is formed on the support, the back surface of the support being the surface on the adhesive layer side Is a laminated structure composed of polyethylene terephthalate and having a water droplet contact angle of the adhesive layer of 77 to 93 degrees.
That is, this laminated structure is obtained by winding and laminating the above-mentioned flexographic printing plate with an adhesive layer or the above-mentioned flexographic printing plate precursor with an adhesive layer around a cylindrical sleeve having a cushion tape wound around the peripheral surface thereof. .
In addition, the laminated structure wound with the flexographic printing plate with the adhesive layer and the laminated structure wrapped with the flexographic printing plate precursor with the adhesive layer have an engraved relief layer or a relief forming layer before engraving. The only difference is whether or not it has. Therefore, in the following description, a laminated structure having a relief layer, which is produced by winding a flexographic printing plate with an adhesive layer around a sleeve, will be described on behalf of both.

FIG. 3A is a cross-sectional view schematically showing an example of a laminated structure according to the present invention, and FIG. 3B is a partially enlarged view of FIG.
A laminated structure 30 shown in FIGS. 3A and 3B includes a sleeve 32, a cushion tape layer 34, an adhesive layer 16, a support 12, and a relief layer 14.
In FIG. 3B, illustration of the image part 14a and the non-image part 14b of the relief layer 14 is omitted.
Here, the adhesive layer 16, the support 12 and the relief layer 14 are basically the same as the adhesive layer 16, the support 12 and the relief layer 14 of the flexographic printing plate with an adhesive layer 10 described above. Therefore, only different points will be described.

The sleeve 32 is a cylindrical member having an open side surface, and is a portion that supports the flexographic printing plate 10 with an adhesive layer wound around the outer peripheral surface of the sleeve 32 via a cushion tape layer 34.
Further, the sleeve 32 is a part that is attached to the flexographic printing apparatus as the laminated structure 30 by inserting a shaft into the hollow portion. That is, the sleeve 32 is a portion that becomes a so-called plate cylinder in the flexographic printing apparatus, and is a portion that rotates together with the shaft during printing.
Accordingly, the sleeve 32 may have an engaging portion formed of a convex portion or a concave portion for fixing the sleeve 32 to the shaft.

  The material for forming the sleeve 32 is not particularly limited, and various resins, metals, and the like used for the plate cylinder of the conventional flexographic printing apparatus can be used. From the viewpoint of strength, mass, processing accuracy, cost, and the like, fiber Glass, carbon fiber or the like is preferably used.

The cushion tape layer 34 has adhesiveness on both sides, and is a part for adhering the flexographic printing plate 10 with the adhesive layer to the peripheral surface of the sleeve 32, and is wound around the peripheral surface of the sleeve 32 and laminated.
Further, the cushion tape layer 34 has elasticity, and has an effect of making the printing pressure uniform by dispersing the printing pressure applied to the image portion of the flexographic printing plate during printing.

  As the cushion tape layer 34, various known cushion tapes used in a conventional flexographic printing apparatus can be used. For example, a cushioning pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer made of an acrylic resin, a methacrylic resin, a styrene-based thermoplastic elastomer, etc. on both surfaces of a polyolefin resin such as polyethylene or a polyurethane resin foam as a base material. Is available.

  The thickness of the cushion tape layer 34 is not particularly limited, but is preferably 0.3 mm to 1.6 mm, and preferably 0.4 mm to 0.00 mm, from the viewpoints of strength, handling properties, and the like that can suitably disperse the printing pressure. 6 mm is more preferable.

The support 12 is laminated on the outer peripheral surface of the cushion tape layer 34, and the relief layer 14 is formed on the support 12.
Here, as shown in FIG. 3B, the adhesive layer 16 is provided in a part between the cushion tape layer 34 and the support 12.
As shown in FIG. 4, the adhesive layer 16 is formed on each of the two end sides in the circumferential direction on the back surface of the support 12.
The water droplet contact angle of the adhesive layer 16 is 77 degrees to 93 degrees.

As described above, when performing flexographic printing or mounting a flexographic printing plate precursor on the plate cylinder and performing laser engraving, cushion tape has been used to bond the flexographic printing plate or flexographic printing plate precursor to the printing cylinder. Only by using it, there is a problem that the flexographic printing plate or the flexographic printing plate precursor is detached from the plate cylinder by high-speed rotation.
In particular, during printing, ink penetrates between the flexographic printing plate and the cushion tape from the joint portion of the flexographic printing plate wound around the plate cylinder, and the cushion tape is attached to the end of the flexographic printing plate. There was a problem that the adhesive strength of the film was reduced and it was easy to peel off.
In addition, when washing ink on the flexographic printing plate after printing, the cleaning liquid penetrates between the flexographic printing plate and the cushion tape from the joints of the flexographic printing plate, and the cushion at the end of the flexographic printing plate. There was a problem that the adhesive strength with the tape was lowered and the tape was peeled off.

On the other hand, the winding start end and end of the printing plate (printing plate precursor) are thinned in advance as overlap allowance, and the start end and end are overlapped and welded to improve the joint strength of the joint portion. It has been proposed to prevent the flexographic printing plate or flexographic printing plate precursor from coming off the plate cylinder by high-speed rotation.
However, the structure in which the start end and the end end are overlapped and welded has a problem that the work of the end portion of the flexographic printing plate (flexographic printing plate precursor) is troublesome and the workability is poor. In addition, since the start and end are welded together, it is difficult to remove the flexographic printing plate from the plate cylinder while maintaining the original shape, and the removed flexographic printing plate cannot be reused. It was.

  In addition, in order to prevent the flexographic printing plate (flexographic printing plate precursor) from coming off the plate cylinder due to high-speed rotation, it can be considered to increase the adhesive strength of the cushion tape, but if the adhesive strength of the cushion tape is too high, At the time of peeling, the flexographic printing plate and / or cushion tape is damaged, and there is a problem that the flexographic printing plate and cushion tape cannot be reused.

On the other hand, in this invention, it has the structure which provided the contact bonding layer 16 whose water-drop contact angle is 77 to 93 degree | times between the flexographic printing plate 11 or the flexographic printing plate precursor 21 and the cushion tape layer 34. FIG. .
In order to favorably bond the PET constituting the back surface of the support 12 and the cushion tape layer 34, it is important that the adhesive layer of the cushion tape layer 34 and the PET are more strongly adhered. Generally, the pressure-sensitive adhesive layer of the cushion tape layer 34 is made of an acrylic adhesive. Naturally, the adhesive layer of the cushion tape layer 34 exhibits stronger adhesive strength when it is wet without repelling PET. This wettability can be evaluated by dropping water droplets on the material surface and measuring the water droplet contact angle. The water droplet contact angle on the surface of PET that has not been treated is about 74 degrees. Therefore, by providing the adhesive layer 16 having a water droplet contact angle of 77 to 93 degrees on the PET surface, the water droplet contact angle is increased and the adhesive force with the cushion tape layer 34 is increased.

Therefore, with such a configuration, the adhesion force (peeling force) between the PET constituting the support 12 of the flexographic printing plate 11 or the flexographic printing plate precursor 21 and the cushion tape layer 34 may be in an appropriate range. Therefore, it is possible to prevent the flexographic printing plate 11 or the flexographic printing plate precursor 21 from being detached from the cushion tape layer 34 (plate cylinder) by high-speed rotation during printing or engraving.
Further, since the adhesion between the flexographic printing plate 11 or the flexographic printing plate precursor 21 and the cushion tape layer 34 is high to some extent, the ink is interposed between the flexographic printing plate 11 or the flexographic printing plate precursor 21 and the cushion tape layer 34. In addition, the flexographic printing plate 11 or the flexographic printing plate precursor 21 can be used as the cushion tape layer 34 ( Can be prevented from coming off the plate cylinder).

  Further, by setting the adhesion between the flexographic printing plate 11 or the flexographic printing plate precursor 21 and the cushion tape layer 34 within an appropriate range, the flexographic printing plate 11 can be easily removed from the cushion tape layer 34 after printing. The flexographic printing plate 11 and the cushion tape layer 34 can be peeled off, and the flexographic printing plate 11 and the cushion tape layer 34 that have been removed can be reused. Therefore, the cost associated with printing can be reduced.

  From the standpoint that the above-mentioned adhesive strength becomes stronger and the adhesive layer 16 can be peeled off, the water droplet contact angle of the adhesive layer 16 is preferably 80 degrees to 91 degrees.

In addition, from the viewpoint that the above-mentioned adhesive strength becomes stronger and can be peeled off, the support 12 and the cushion tape layer 34 bonded together via the adhesive layer 16 having a water droplet contact angle of 77 degrees to 93 degrees, The 90 degree peeling force is preferably 3.3 N / cm to 6.0 N / cm, and more preferably 3.5 N / cm to 5.5 N / cm.
Here, the 90 degree peeling force is a peeling force between the support 12 and the cushion tape layer 34 measured according to JISZ0237.

Further, in the example shown in FIG. 3B, the adhesive layer 16 is configured to be formed on each of the two edge sides in the circumferential direction on the back surface of the support 12, but the present invention is not limited thereto. It may be formed on each of the four end sides of the back surface of the support 12 or may be formed on the entire back surface of the support 12.
In order to more suitably suppress peeling from the cushion tape layer 34, it is preferable to provide the adhesive layer 16 at least on each of the two end sides in the circumferential direction on the back surface of the support 12.

  Moreover, when the adhesive layer 16 is provided on each of the two edge sides in the circumferential direction on the back surface of the support 12 as in the illustrated example, the width of the adhesive layer 16 in the circumferential direction is 1 mm to 100 mm. Preferably, the thickness is 3 mm to 50 mm, more preferably 5 mm to 20 mm.

  In the example shown in FIG. 3A, the circumferential length of the flexographic printing plate 10 with the adhesive layer is substantially the same as the outer circumference of the cushion tape layer 34 (the outer circumference of the sleeve 32). Although it was set as the structure wound and laminated | stacked on substantially the perimeter of a surrounding surface, it is not limited to this, The flexographic printing plate 10 with an adhesive layer is also good as a structure laminated | stacked on a part of surrounding surface of the sleeve 32. Alternatively, a plurality of flexographic printing plates 10 with an adhesive layer may be stacked on the peripheral surface of the sleeve 32.

[Flexo printing equipment]
Next, the configuration of a flexographic printing apparatus (hereinafter also simply referred to as “printing apparatus”) using the laminated structure (flexographic printing plate with an adhesive layer) according to the present invention will be described in detail. The flexographic printing apparatus basically has the same configuration as that of a conventional flexographic printing apparatus except that the laminated structure is used.

FIG. 5 is a diagram conceptually showing a main part of a flexographic printing apparatus using the laminated structure according to the present invention.
As shown in FIG. 5, the flexographic printing apparatus 50 includes the laminated structure 30, the shaft 51, a conveyance roller (impression cylinder) 52, an anilox roller 53, a doctor chamber 54, and a circulation tank 55.

The shaft 51 is a rotating shaft that is inserted into the hollow portion of the sleeve 32 and to which the laminated structure 30 is attached. The shaft 51 constitutes a plate cylinder together with the sleeve 32 and rotates while bringing the flexographic printing plate 11 into contact with the printing medium z.
The transport roller 52 is a roller that constitutes a transport unit (not shown) that transports the printing medium z along a predetermined transport path. The printed body z is brought into contact with the flexographic printing plate 11.
The shaft 51 is arranged so that the rotation direction thereof coincides with the conveyance direction of the printing medium z.

  The anilox roller 53, the doctor chamber 54, and the circulation tank 55 are for supplying ink to the flexographic printing plate 11. The circulation tank 55 stores ink, and the ink in the circulation tank 55 is supplied to the doctor chamber 54 by a pump (not shown). The doctor chamber 54 is provided in close contact with the surface of the anilox roller 53 and holds ink therein. The anilox roller 53 is in contact with the flexographic printing plate 11 laminated on the peripheral surface of the sleeve 32, rotates in synchronization with the sleeve 32 (shaft 51), and applies (supply) the ink in the doctor chamber 54 to the flexographic printing plate 11. To do.

  The flexographic printing apparatus 50 configured in this manner rotates the flexographic printing plate 11 placed on the plate cylinder while conveying the printing medium z along a predetermined conveyance path, and transfers the ink to the printing medium z. And print. That is, the rotation direction of the drum on which the flexographic printing plate is placed becomes the printing direction.

There are no particular limitations on the type of printing medium used in the flexographic printing apparatus, and various known printing media used in ordinary flexographic printing apparatuses such as paper, film, and cardboard can be used.
In addition, the type of ink used in the flexographic printing apparatus is not particularly limited, and is used in a normal flexographic printing apparatus such as water-based ink, UV (Ultra Violet) ink, oil-based ink, EB (electron beam) ink, Various known inks can be used.

[Method for producing flexographic printing plate precursor with adhesive layer]
Next, the manufacturing method of the flexographic printing plate precursor according to the present invention will be described in detail.
The method for producing the flexographic printing plate precursor of the present invention comprises:
Prepare a flexographic printing plate precursor comprising a support and a relief forming layer formed on the support, the back surface of the support opposite to the surface on which the relief forming layer is formed is made of polyethylene terephthalate The printing plate precursor preparation process,
An adhesive layer forming step of forming an adhesive layer by applying an undercoat liquid to be an adhesive layer on at least a part of the back surface of the support of the flexographic printing plate precursor,
It is a manufacturing method in which the water droplet contact angle of the adhesive layer formed in the adhesive layer forming step is 77 degrees to 93 degrees.

[Preparation process for printing plate precursor]
The printing plate precursor preparation step is a step of preparing a flexographic printing plate precursor having at least a support composed of PET on the back surface and a relief forming layer formed on the surface opposite to the back surface.
In the present invention, the method for preparing the flexographic printing plate precursor is not particularly limited, and the flexographic printing plate precursor may be prepared and prepared by a known production method.
As an example, a flexographic printing plate precursor can be produced by laminating and laminating a resin sheet as a relief forming layer and a film-like material as a support. Alternatively, it can also be produced by forming a relief forming layer directly on the support.

  As described above, the support is a film-like material having at least the back surface formed of PET, and is a PET film or a laminated film in which a PET film and another resin film are laminated.

<Relief forming layer>
The relief forming layer used in the present invention is not particularly limited as long as it is a known resin plate or rubber plate for flexographic printing.
The relief forming layer (cured layer) is preferably the following resin sheet.

As the resin sheet, a curable resin composition containing at least a polymer having a monomer unit derived from a diene hydrocarbon (hereinafter, also referred to as “resin composition for forming a resin sheet”) is formed into a sheet shape. The sheet is preferably cured later by the action of heat and / or light, and more preferably formed from a resin composition for forming a resin sheet, which will be described later.
The resin sheet is preferably capable of laser engraving.

As a resin sheet forming method, a resin composition for forming a resin sheet is prepared, and if necessary, after removing the solvent from the resin composition, it is melt-extruded on a support, or for resin sheet formation. A method for preparing a resin composition, casting the resin composition on a support, and removing the solvent by heating and drying it in an oven or the like, using a calender roll as shown in FIG. A preferred example is a method of molding the composition into a sheet.
In FIG. 6, the calendar roll 60 has a first roll 62a to a fourth roll 62d, and the interval between these rolls, the roll temperature, and the rotation speed of the roll can be set. The kneaded material 70 is set between the rolls, and the resin sheet 71 can be obtained by rolling.

  The resin composition for forming a resin sheet used in the present invention is obtained by, for example, dissolving or dispersing a polymer having a monomer unit derived from a diene hydrocarbon, a polymerizable compound, a fragrance, a plasticizer, and the like in an appropriate solvent, Subsequently, it can manufacture by dissolving a crosslinking agent, a polymerization initiator, a crosslinking accelerator, etc. From the viewpoint of the ease of formation of the resin sheet, the thickness accuracy of the resulting printing plate precursor, and the handling of the resin sheet, at least a part of the solvent component, preferably almost all, is at the stage of producing the printing plate precursor. Since it needs to be removed, an organic solvent having moderate volatility is preferable as the solvent.

  Next, the components contained in the resin sheet and the resin composition for forming a resin sheet will be described.

(Polymer having monomer units derived from diene hydrocarbon)
The resin sheet used in the present invention preferably contains a polymer having a monomer unit derived from a diene hydrocarbon (hereinafter, also referred to as “specific polymer”) as an essential component.
The weight average molecular weight of the specific polymer is preferably from 50,000 to 1,600,000, more preferably from 10,000 to 1,000,000, and even more preferably from 15,000 to 600,000. When the weight average molecular weight is 50,000 or more, the form retainability as a single resin is excellent, and when it is 1.6 million or less, it is easy to dissolve in a solvent and it is convenient for preparing a resin composition for laser engraving.
In the present invention, the weight average molecular weight is measured by a gel permeation chromatography (GPC) method and is determined by conversion with standard polystyrene. Specifically, for example, GPC uses HLC-8220GPC (manufactured by Tosoh Corporation), and three columns of TSKgeL SuperHZM-H, TSKgeL SuperHZ4000, TSKgeL SuperHZ2000 (manufactured by Tosoh Corporation, 4.6 mm ID × 15 cm). And THF (tetrahydrofuran) is used as the eluent. The conditions are as follows: the sample concentration is 0.35 mass%, the flow rate is 0.35 ml / min, the sample injection amount is 10 μL, the measurement temperature is 40 ° C., and an IR detector is used. In addition, the calibration curve is “Standard sample TSK standard, polystyrene” manufactured by Tosoh Corporation: “F-40”, “F-20”, “F-4”, “F-1”, “A-5000”, “ It is prepared from 8 samples of “A-2500”, “A-1000” and “n-propylbenzene”.

  The specific polymer may be a specific polymer having a monomer unit derived from a non-conjugated diene hydrocarbon, but is preferably a specific polymer having a monomer unit derived from a conjugated diene hydrocarbon.

(Specific polymer having monomer units derived from conjugated diene hydrocarbon)
Specific polymers having monomer units derived from conjugated diene hydrocarbons include polymers obtained by polymerizing conjugated diene hydrocarbons, conjugated diene hydrocarbons and other unsaturated compounds, preferably mono Preferred examples include copolymers obtained by polymerizing olefinic unsaturated compounds. In addition, the above polymers and copolymers may be modified, for example, a reactive group such as a (meth) acryloyl group may be introduced at the end, and a part of the internal olefin is hydrogenated. May be. In the following description, polybutadiene in which part of the internal olefin is hydrogenated is also referred to as “partially hydrogenated polybutadiene”, and similarly, polyisoprene in which part of the internal olefin is hydrogenated is also referred to as “partially hydrogenated polyisoprene”. . Further, the copolymer may be a random polymer, a block copolymer, or a graft polymer, and is not particularly limited.

Specific examples of the conjugated diene hydrocarbon include 1,3-butadiene, isoprene and the like. These compounds are used alone or in combination of two or more.
Specific examples of the monoolefin unsaturated compound include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, isobutene, vinyl chloride, vinylidene chloride, (meth) acrylamide, (meta ) Acrylamide vinyl acetate, (meth) acrylic acid ester, (meth) acrylic acid and the like.

The polymer obtained by polymerizing the conjugated diene hydrocarbon or the copolymer obtained by polymerizing the conjugated diene hydrocarbon and the monoolefin unsaturated compound is not particularly limited, and specifically, Butadiene polymer, isoprene polymer, styrene-butadiene copolymer, styrene-isoprene copolymer, acrylate ester-isoprene copolymer, methacrylic acid ester and conjugated diene copolymer, acrylonitrile-butadiene-styrene copolymer Examples thereof include styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, and isobutene-isoprene copolymer (butyl rubber).
These polymers may be emulsion-polymerized or solution-polymerized.

  In the present invention, the specific polymer may have an ethylenically unsaturated group at the terminal, or may have a partial structure represented by the following formula (A-1).

(In formula (A-1), R ¹ represents a hydrogen atom or a methyl group, A represents O or NH, and * represents a bonding position with another structure.)

That is, the specific polymer may have a (meth) acryloyloxy group or a (meth) acrylamide group in the molecule, and (meth) acryloyloxy group in which A in the formula (A-1) is represented by O. It is more preferable to have. The (meth) acramide group means an acrylamide group or a methacrylamide group.
The specific polymer may have the partial structure represented by the formula (A-1) at either the main chain terminal or the side chain, but preferably has the main chain terminal.
From the viewpoint of printing durability, the specific polymer preferably has two or more partial structures represented by the formula (A-1) in the molecule.

Specific polymers having a partial structure represented by the formula (A-1) include polybutadiene di (meth) acrylate, partially hydrogenated polybutadiene di (meth) acrylate, polyisoprene (meth) acrylate, and partially hydrogenated polyisoprene. A polyolefin (meth) acrylate obtained by reacting an ethylenically unsaturated group-containing compound with a hydroxyl group of a hydroxyl group-containing polyolefin such as (meth) acrylate (for example, BAC-45 (manufactured by Osaka Organic Chemical Industry Co., Ltd.), TEA-1000) , TE-2000, EMA-3000 (manufactured by Nippon Soda Co., Ltd.)).
In addition, modified polyolefins obtained by modifying polyolefins and introducing ethylenically unsaturated bonds (for example, methacrylate-introduced polyisoprene (Kuraprene UC-203, UC-102 (manufactured by Kuraray Co., Ltd.)) are also preferred.

(Polymer having monomer units derived from butadiene and / or isoprene)
In the present invention, the specific polymer is preferably a polymer having monomer units derived from butadiene and / or isoprene.
Specifically, polybutadiene (butadiene rubber), partially hydrogenated polybutadiene, terminal-modified polybutadiene, polyisoprene (isoprene rubber), partially hydrogenated polyisoprene, terminal-modified polyisoprene, SBR (styrene-butadiene rubber), SBS (styrene- Examples thereof include butadiene-styrene triblock copolymer), ABS (acrylonitrile-butadiene-styrene copolymer), SIS (styrene-isoprene-styrene triblock copolymer), and isoprene / butadiene copolymer.
The terminal modification means that the main chain or side chain terminal is modified with an amide group, a carboxy group, a hydroxy group, a (meth) acryloyl group, a glycidyl group, or the like.
Among these, polybutadiene, partially hydrogenated polybutadiene, hydroxyl-terminated polybutadiene, glycidyl ether-modified polybutadiene, polyisoprene, partially hydrogenated polyisoprene, terminal-modified polyisoprene, hydroxyl-terminated polyisoprene, glycidyl ether-modified polyisoprene, SBS, and SIS are preferable. .

  The proportion of monomer units derived from butadiene, isoprene or hydrogenated product thereof is preferably 30 mol% or more in total, more preferably 50 mol% or more, and further preferably 80 mol% or more. preferable.

Isoprene is known to polymerize by 1,2-, 3,4-, or 1,4-addition depending on the catalyst and reaction conditions. In the present invention, polyisoprene polymerized by any of the above additions is known. But you can. Among these, from the viewpoint of obtaining desired elasticity, it is preferable to contain cis-1,4-polyisoprene as a main component. In addition, when the specific polymer is polyisoprene, the content of cis-1,4-polyisoprene is preferably 50% by mass or more, more preferably 65% by mass or more, and 80% by mass or more. More preferably, it is particularly preferably 90% by mass or more.
As polyisoprene, natural rubber may be used, and commercially available polyisoprene can also be used. For example, the NIPOL IR series (manufactured by Nippon Zeon Co., Ltd.) is exemplified.

Butadiene is known to be polymerized by 1,2- or 1,4-addition depending on the catalyst and reaction conditions. In the present invention, polybutadiene polymerized by any of the above additions may be used. Among these, it is more preferable that 1,4-polybutadiene is a main component from the viewpoint of obtaining desired elasticity.
When the specific polymer is polybutadiene, the content of 1,4-polybutadiene is preferably 50% by mass or more, more preferably 65% by mass or more, and further preferably 80% by mass or more. It is preferably 90% by mass or more.
In addition, although there is no restriction | limiting in particular in content of a cis body and a trans body, From a viewpoint of expressing rubber elasticity, a cis body is preferable and it is preferable that content of cis-1,4-polybutadiene is 50 mass% or more. , 65% by mass or more, more preferably 80% by mass or more, and particularly preferably 90% by mass or more.
As the polybutadiene, commercially available products may be used, and examples thereof include the NIPOL BR series (manufactured by Zeon Corporation) and the UBEPOL BR series (manufactured by Ube Industries).

(Specific polymer having monomer units derived from non-conjugated diene hydrocarbon)
The specific polymer may be a specific polymer having a monomer unit derived from a non-conjugated diene hydrocarbon.
Preferred examples of the specific polymer include a copolymer obtained by polymerizing a nonconjugated diene hydrocarbon and another unsaturated compound, preferably an α-olefinic unsaturated compound. The copolymer may be a random polymer, a block copolymer, or a graft polymer, and is not particularly limited.

Specific examples of the non-conjugated diene hydrocarbons include dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylene norbornene, and ethylidene norbornene. Dicyclopentadiene and ethylidene norbornene are preferable. Ethylidene norbornene is more preferable. These compounds are used alone or in combination of two or more.
Specifically as said monoolefin type unsaturated compound, C2-C20 alpha-olefins, such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-pentene, are mentioned, for example, Ethylene and propylene are preferable, and a combination of ethylene and propylene is more preferable. These compounds are used alone or in combination of two or more.

  A polymer obtained by polymerizing the above conjugated diene hydrocarbon or a copolymer obtained by polymerizing a conjugated diene hydrocarbon and an α-olefin unsaturated compound is not particularly limited, but ethylene-α An olefin-diene copolymer is preferred, and ethylene-propylene-diene rubber (EPDM) is more preferred.

  Among these, the specific polymer is preferably styrene-butadiene rubber, butadiene rubber, isoprene rubber, or ethylene-propylene-diene rubber, and more preferably butadiene rubber.

In addition, the specific polymer is preferably a polymer whose main chain mainly contains isoprene or butadiene as a monomer unit, and a part thereof may be hydrogenated to be converted to a saturated bond. In addition, the main chain or the terminal of the polymer may be modified with an amide, a carboxy group, a hydroxy group, a (meth) acryloyl group or the like, or may be epoxidized.
Among these, the specific polymer is preferably exemplified by polybutadiene, polyisoprene, and isoprene / butadiene copolymer from the viewpoint of solubility in a solvent and handling, polybutadiene and polyisoprene are more preferable, and polybutadiene is more preferable.

The specific polymer preferably has a glass transition temperature (Tg) of 20 ° C. or less from the viewpoint of flexibility and rubber elasticity.
In addition, the glass transition temperature of a specific polymer is measured according to JIS K7121-1987 using a differential scanning calorimeter (DSC).
In addition, when a specific polymer has two or more glass transition temperatures, it is preferable that at least one is 20 degrees C or less, and it is more preferable that all the glass transition temperatures are 20 degrees C or less.

In the present invention, the specific polymer preferably has an SP value of 14.0 to 18.0 MPa ^1/2 , more preferably 15.0 to 17.5 MPa ^1/2 , and 16.0 to 17.5 MPa. More preferably, it is ^1/2 .
The SP value is the square root of the cohesive energy density of molecules, and represents the magnitude of the cohesive force between molecules, and is a measure of polarity.
It is preferable for the SP value to be in the above-mentioned range because moderate adhesiveness with a urethane-based adhesive can be obtained.
The SP value is calculated based on the Okitsu method described in Journal of the Japan Adhesion Society 29 (3) 1993, 204-211.

The specific polymer is preferably an elastomer or a plastomer. When the specific polymer is an elastomer or a plastomer, good thickness accuracy and dimensional accuracy can be achieved when the printing plate precursor for laser engraving obtained therefrom is formed into a sheet or cylinder. Moreover, since the elasticity required for a flexographic printing plate can be provided, it is preferable.
In the present invention, “plastomer” means that it is easily deformed by heating and deformed by cooling, as described in “New edition polymer dictionary” edited by the Society of Polymer Science, Japan (Asakura Shoten, published in 1988). It means a polymer having the property that it can be solidified into a shaped shape. Plastomer is a term for an elastomer (having the property of instantly deforming according to the external force when an external force is applied and restoring the original shape in a short time when the external force is removed). It does not show such elastic deformation and easily plastically deforms.
In the present invention, the plastomer can be deformed to 200% with a small external force at room temperature (20 ° C.) when the original size is 100%, and does not return to 130% or less even when the external force is removed. Means things. The small external force specifically refers to an external force having a tensile strength of 1 to 100 MPa. More specifically, based on the tensile permanent strain test of JIS K 6262-1997, when the dumbbell-shaped No. 4 test piece specified in JIS K 6251-1993 was used, the above test piece was subjected to a tensile test at 20 ° C. It is possible to stretch without breaking to twice the distance between the marked lines before tensioning, and after holding for 60 minutes when the distance between the marked lines before tension is extended to twice the distance between the marked lines, 5 It means a polymer having a tensile set of 30% or more after a minute. In the present invention, all of the test pieces are JIS K 6262 except that the test piece is dumbbell-shaped No. 4 defined in JIS K6251-1993, the holding time is 60 minutes, and the temperature of the test chamber is 20 ° C. -1997 tensile permanent strain test method.
In the case of a polymer that cannot be measured as described above, that is, in a tensile test, a polymer that does not return to its original shape even if a tensile external force is not applied, or a polymer that breaks by applying a small external force during the above measurement is a plastomer. Hit above.
Furthermore, in the present invention, the plastomer has a polymer glass transition temperature (Tg) of less than 20 ° C. In the case of a polymer having two or more Tg, all Tg is less than 20 ° C. The Tg of the polymer can be measured by a differential scanning calorimetry (DSC) method.

In the present invention, an elastomer is a polymer that can be stretched to twice the distance between the marked lines in the above-described tensile test and that has a tensile set of less than 30% after 5 minutes excluding tensile external force. means.
The viscosity of the specific polymer of the present invention at 20 ° C. is preferably 10 Pa · s to 10 kPa · s, more preferably 50 Pa · s to 5 kPa · s. When the viscosity is within this range, the resin composition can be easily formed into a sheet and the process is simple. In this invention, when a specific polymer is a plastomer, when shape | molding the resin composition for resin sheet formation in a sheet form, favorable thickness precision and dimensional precision can be achieved.

In the present invention, the specific polymer may be used alone or in combination of two or more.
The total content of the specific polymer in the resin sheet used in the present invention is preferably 5 to 90% by mass, more preferably 15 to 85% by mass, and further preferably 30 to 80% by mass with respect to the total solid content of the resin sheet. preferable.
The total content of the specific polymer in the resin composition for forming a resin sheet used in the present invention is preferably 5 to 90% by mass, more preferably 15 to 85% by mass with respect to the total mass of the solid content of the resin composition. 30 to 80% by mass is more preferable. When the content of the specific polymer is 5% by mass or more, printing durability sufficient to use the obtained resin sheet as a printing plate can be obtained, and when it is 90% by mass or less, other components are insufficient. Therefore, even when a printing plate is used, flexibility sufficient for use as a printing plate can be obtained.
In addition, "solid content total mass" means the total mass remove | excluding volatile components, such as a solvent, from the resin sheet or the resin composition for resin sheet formation.

  It is preferable that the resin sheet used for this invention and the resin composition for resin sheet formation contain a polymerization initiator, a photothermal conversion agent, a solvent, and another component. Hereinafter, these components will be described in detail.

(Polymerization initiator)
In the present invention, the resin sheet is preferably formed using a resin composition for forming a resin sheet containing a polymerization initiator. By containing a polymerization initiator, the specific polymer and the crosslinking of the ethylenically unsaturated bonds contained in the polymerizable compound described later are promoted.
As the polymerization initiator, those known to those skilled in the art can be used without limitation, and either a photopolymerization initiator or a thermal polymerization initiator can be used, but crosslinking can be formed with a simple apparatus. A thermal polymerization initiator is preferred. Hereinafter, although the radical polymerization initiator which is a preferable polymerization initiator is explained in full detail, this invention is not restrict | limited by these description.

  In the present invention, preferred polymerization initiators include (a) aromatic ketones, (b) onium salt compounds, (c) organic peroxides, (d) thio compounds, (e) hexaarylbiimidazole compounds, f) ketoxime ester compounds, (g) borate compounds, (h) azinium compounds, (i) metallocene compounds, (j) active ester compounds, (k) compounds having a carbon halogen bond, (l) azo compounds, etc. Can be mentioned. Specific examples of the above (a) to (l) are given below, but the present invention is not limited to these.

  In the present invention, (c) an organic peroxide and (l) an azo compound are more preferred from the viewpoint of engraving sensitivity and a good relief edge shape when applied to a resin sheet, and (c) an organic compound. Peroxides are particularly preferred.

(A) aromatic ketones, (b) onium salt compounds, (d) thio compounds, (e) hexaarylbiimidazole compounds, (f) ketoxime ester compounds, (g) borate compounds, (h) azinium compounds As (i) metallocene compounds, (j) active ester compounds, and (k) compounds having a carbon halogen bond, the compounds listed in paragraphs 0074 to 0118 of JP-A-2008-63554 are preferably used. it can.
In addition, (c) the organic peroxide and (l) the azo compound are preferably the following compounds.

(C) Organic peroxide Preferred as a thermal polymerization initiator that can be used in the present invention (c) As the organic peroxide, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone 3,3 ′, 4,4′-tetra (t-amylperoxycarbonyl) benzophenone, 3,3 ′, 4,4′-tetra (t-hexylperoxycarbonyl) benzophenone, 3,3 ′, 4, 4'-tetra (t-octylperoxycarbonyl) benzophenone, 3,3 ', 4,4'-tetra (cumylperoxycarbonyl) benzophenone, 3,3', 4,4'-tetra (p-isopropylcumylper) Oxycarbonyl) benzophenone, di-t-butyldiperoxyisophthalate, di-t-butyldiperoxyisophthalate, t-butylperoxybenzoate , T-butylperoxy-3-methylbenzoate, t-butylperoxylaurate, t-butylperoxypivalate, t-butylperoxy-2-ethylhexanoate, t-butylperoxy-3,5 , 5-trimethylhexanoate, t-butylperoxyneoheptanoate, t-butylperoxyneodecanoate, t-butylperoxyacetate, and the like, α, α′-di (t -Butylperoxy) diisopropylbenzene, dicumyl peroxide, t-butylcumyl peroxide, di-t-butyl peroxide, t-butylperoxyisopropyl monocarbonate, t-butylperoxy-2-ethylhexyl monocarbonate, etc. Peroxide esters are preferred. Among these, t-butyl peroxybenzoate is particularly preferable from the viewpoint of excellent compatibility.

(L) Azo-based compound Preferred as a polymerization initiator that can be used in the present invention (l) As the azo-based compound, 2,2′-azobisisobutyronitrile, 2,2′-azobispropionitrile, 1,1′-azobis (cyclohexane-1-carbonitrile), 2,2′-azobis (2-methylbutyronitrile), 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2 ′ -Azobis (4-methoxy-2,4-dimethylvaleronitrile), 4,4'-azobis (4-cyanovaleric acid), dimethyl 2,2'-azobisisobutyrate, 2,2'-azobis (2-methylpropion) Amidooxime), 2,2′-azobis [2- (2-imidazolin-2-yl) propane], 2,2′-azobis {2-methyl-N- [1,1-bis (hydroxymethyl) -2 -Hydro Cyethyl] propionamide}, 2,2′-azobis [2-methyl-N- (2-hydroxyethyl) propionamide], 2,2′-azobis (N-butyl-2-methylpropionamide), 2,2 '-Azobis (N-cyclohexyl-2-methylpropionamide), 2,2'-azobis [N- (2-propenyl) -2-methylpropionamide], 2,2'-azobis (2,4,4- Trimethylpentane) and the like.

  In the present invention, the organic peroxide (c) is particularly preferable as a polymerization initiator in the present invention from the viewpoint of improving the crosslinkability of the resin sheet and engraving sensitivity.

From the viewpoint of engraving sensitivity, an embodiment in which this (c) organic peroxide and a photothermal conversion agent described later are combined is particularly preferable.
This is because when an organic peroxide is used to cure a resin sheet by thermal crosslinking, an unreacted organic peroxide that does not participate in radical generation remains, but the remaining organic peroxide is a self-reactive addition. Works as an agent and decomposes exothermically during laser engraving. As a result, it is presumed that the engraving sensitivity is increased because the heat generated is added to the irradiated laser energy.
In addition, although explained in full detail in description of a photothermal conversion agent, this effect is remarkable when using carbon black as a photothermal conversion agent. This is because (c) heat generated from carbon black is also transferred to organic peroxide, so heat is generated not only from carbon black but also from organic peroxide. This is because energy generation occurs synergistically.

In the present invention, the polymerization initiator may be used alone or in combination of two or more.
The content of the polymerization initiator in the resin sheet used in the present invention is preferably 0.01 to 30% by mass and more preferably 0.1 to 20% by mass with respect to the total solid content. Preferably, it is more preferable that it is 1 to 15%.
It is preferable that content of the polymerization initiator in the resin composition for resin sheet formation used for this invention is 0.01-30 mass% with respect to solid content total mass, and 0.1-20 mass% It is more preferable that it is 1 to 15%. It is preferable for the content to be in the above range since the curability (crosslinking property) is excellent, the relief edge shape is good when laser engraving is performed, and the rinse property is excellent.

(Photothermal conversion agent)
The resin sheet and the resin composition for forming a resin sheet used in the present invention preferably further contain a photothermal conversion agent. That is, it is considered that the photothermal conversion agent in the present invention promotes thermal decomposition of a cured product during laser engraving by absorbing laser light and generating heat. For this reason, it is preferable to select a photothermal conversion agent that absorbs light having a laser wavelength used for engraving.

When the resin sheet used in the present invention is used for laser engraving using a laser (YAG laser, semiconductor laser, fiber laser, surface emitting laser, etc.) emitting an infrared ray of 700 to 1,300 nm as a light source, It is preferable to use a compound having a maximum absorption wavelength at 700 to 1,300 nm.
Various dyes or pigments are used as the photothermal conversion agent in the present invention.

  Among the photothermal conversion agents, as the dye, commercially available dyes and known ones described in documents such as “Dye Handbook” (edited by the Society for Synthetic Organic Chemistry, published in 1970) can be used. Specific examples include those having a maximum absorption wavelength at 700 to 1,300 nm. Azo dyes, metal complex azo dyes, pyrazolone azo dyes, naphthoquinone dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, diimonium compounds, quinone imine dyes Preferred are dyes such as methine dyes, cyanine dyes, squarylium dyes, pyrylium salts, metal thiolate complexes. Dyes preferably used in the present invention include cyanine dyes such as heptamethine cyanine dyes, oxonol dyes such as pentamethine oxonol dyes, phthalocyanine dyes, and paragraphs 0124 to 0137 of JP-A-2008-63554. Mention may be made of dyes.

Among the photothermal conversion agents used in the present invention, commercially available pigments and color index (CI) manuals, “latest pigment manuals” (edited by the Japan Pigment Technical Association, published in 1977), “latest pigment application” The pigments described in “Technology” (CMC Publishing, 1986) and “Printing Ink Technology” CMC Publishing, 1984) can be used. Examples of the pigment include pigments described in paragraphs 0122 to 0125 of JP-A-2009-178869.
Of these pigments, carbon black is preferred.

  As long as the dispersibility in the composition is stable, carbon black can be used regardless of the classification according to ASTM or the use (for example, for color, for rubber, for dry battery, etc.). Carbon black includes, for example, furnace black, thermal black, channel black, lamp black, acetylene black and the like. In order to facilitate dispersion, black colorants such as carbon black can be used as color chips or color pastes previously dispersed in nitrocellulose or a binder, if necessary. Such chips and pastes can be easily obtained as commercial products. Examples of carbon black include those described in paragraphs 0130 to 0134 of JP2009-178869A.

Only 1 type may be used for the photothermal conversion agent in the resin sheet and resin composition for resin sheet formation used for this invention, and it may use 2 or more types together.
The content of the photothermal conversion agent in the resin sheet varies greatly depending on the molecular extinction coefficient inherent to the molecule, but is preferably in the range of 0.01 to 30% by mass of the total solid content, 0.05 to 20% by mass. % Is more preferable, and 0.1 to 10% by mass is particularly preferable.
The content of the photothermal conversion agent in the resin composition for forming a resin sheet varies greatly depending on the molecular extinction coefficient inherent to the molecule, but is preferably in the range of 0.01 to 30% by mass of the total solid content. 0.05 to 20% by mass is more preferable, and 0.1 to 10% by mass is particularly preferable.

(solvent)
The resin composition for forming a resin sheet used in the present invention may contain a solvent.
As the solvent, an organic solvent is preferably used.
Preferred specific examples of the aprotic organic solvent include acetonitrile, tetrahydrofuran, dioxane, toluene, propylene glycol monomethyl ether acetate, methyl ethyl ketone, acetone, methyl isobutyl ketone, ethyl acetate, butyl acetate, ethyl lactate, N, N-dimethylacetamide, N -Methylpyrrolidone, dimethyl sulfoxide are mentioned.
Preferable specific examples of the protic organic solvent include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 1-methoxy-2-propanol, ethylene glycol, diethylene glycol, and 1,3-propanediol.
Among these, propylene glycol monomethyl ether acetate is particularly preferable.

(Other additives)
Various known additives can be appropriately blended in the resin sheet and the resin composition for forming a resin sheet used in the present invention as long as the effects of the present invention are not impaired. For example, a crosslinking agent, a crosslinking accelerator, a plasticizer, a filler, a wax, a process oil, a metal oxide, an antiozonation agent, an antiaging agent, a polymerization inhibitor, a coloring agent, and the like can be mentioned. Or two or more of them may be used in combination.

(Polymerizable compound)
The resin sheet used in the present invention can be formed by using a resin composition for forming a resin sheet containing a polymerizable compound in order to promote the formation of a crosslinked structure. By containing a polymerizable compound, formation of a crosslinked structure is promoted, and the printing plate obtained is excellent in printing durability.
The specific polymer having an ethylenically unsaturated group described above is not included in the polymerizable compound.
Furthermore, the polymerizable compound is preferably a compound having a molecular weight of less than 3,000, and more preferably a compound having a molecular weight of less than 1,000.
The polymerizable compound is preferably a radical polymerizable compound, and is preferably an ethylenically unsaturated compound.

The polymerizable compound used in the present invention is preferably a polyfunctional ethylenically unsaturated compound. It is excellent in the printing durability of the printing plate obtained as it is the said aspect.
The polyfunctional ethylenically unsaturated compound is preferably a compound having 2 to 20 terminal ethylenically unsaturated groups. Such a compound group is widely known in this industrial field, and in the present invention, these can be used without any particular limitation.
Examples of compounds derived from an ethylenically unsaturated group in a polyfunctional ethylenically unsaturated compound include unsaturated carboxylic acids (eg, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.) Examples include esters and amides. Preferably, esters of unsaturated carboxylic acids and aliphatic polyhydric alcohol compounds, and amides of unsaturated carboxylic acids and aliphatic polyvalent amine compounds are used. In addition, unsaturated carboxylic acid esters having nucleophilic substituents such as hydroxy groups and amino groups, amides and polyfunctional isocyanates, addition reaction products of epoxies, and dehydration condensation reaction products of polyfunctional carboxylic acids Etc. are also preferably used. In addition, an unsaturated carboxylic acid ester having an electrophilic substituent such as an isocyanato group or an epoxy group, an amide and a monofunctional or polyfunctional alcohol, an addition reaction product of an amine, a halogen group, a tosyloxy group, A substituted reaction product of unsaturated carboxylic acid ester, amide and monofunctional or polyfunctional alcohols or amines having a leaving substituent such as the above is also suitable. As another example, a compound group in which a vinyl compound, an allyl compound, an unsaturated phosphonic acid, styrene, or the like is substituted for the above unsaturated carboxylic acid can be used.

  The ethylenically unsaturated group contained in the polymerizable compound is preferably an acrylate, methacrylate, vinyl compound, or allyl compound residue from the viewpoint of reactivity. Further, from the viewpoint of printing durability, the polyfunctional ethylenically unsaturated compound preferably has 3 or more ethylenically unsaturated groups.

  Specific examples of the monomer of an ester of an aliphatic polyhydric alcohol compound and an unsaturated carboxylic acid include acrylic acid esters such as ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, 1, 3 -Butanediol diacrylate, tetramethylene glycol diacrylate, propylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, polypropylene glycol diacrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, 1 , 4-Cyclohexanediol diacrylate, tetraethylene glycol diacrylate, polytetramethyl Glycol diacrylate, 1,8-octanediol diacrylate, 1,9-nonanediol diacrylate, 1,10-decanediol diacrylate, tricyclodecane dimethanol diacrylate, trimethylolpropane triacrylate, trimethylolpropane triacrylate (Acryloyloxypropyl) ether, ditrimethylolpropane tetraacrylate, trimethylolethane triacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol diacrylate, dipentaerythritol hexaacrylate, sorbitol triacrylate, Sorbitol tetraacrylate, sorbitol pentaacrylate Sorbitol hexaacrylate, tri (acryloyloxyethyl) isocyanurate, polyester acrylate oligomer.

  Methacrylic acid esters include tetramethylene glycol dimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, propylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate, polypropylene Glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, 1,3-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, 1,8-octanediol dimethacrylate, 1 , 9-Nonanediol dimethacryl 1,10-decanediol dimethacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol dimethacrylate, dipentaerythritol hexamethacrylate, sorbitol trimethacrylate, sorbitol tetramethacrylate, bis [p -(3-Methacryloxy-2-hydroxypropoxy) phenyl] dimethylmethane, bis [p- (methacryloxyethoxy) phenyl] dimethylmethane and the like. Of these, trimethylolpropane trimethacrylate and polyethylene glycol dimethacrylate are particularly preferable.

  Itaconic acid esters include ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, pentaerythritol diitaconate Sorbitol tetritaconate and the like.

  Examples of crotonic acid esters include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, and sorbitol tetracrotonate.

  Examples of isocrotonic acid esters include ethylene glycol diisocrotonate, pentaerythritol diisocrotonate, and sorbitol tetraisocrotonate.

  Examples of maleic acid esters include ethylene glycol dimaleate, triethylene glycol dimaleate, pentaerythritol dimaleate, and sorbitol tetramaleate.

  Examples of other esters include aliphatic alcohol esters described in JP-B-46-27926, JP-B-51-47334, JP-A-57-196231, JP-A-59-5240, Those having an aromatic skeleton described in JP-A-59-5241 and JP-A-2-226149 and those containing an amino group described in JP-A-1-165613 are also preferably used.

  The ester monomers can also be used as a mixture.

  Specific examples of amide monomers of aliphatic polyvalent amine compounds and unsaturated carboxylic acids include methylene bisacrylamide, methylene bismethacrylamide, 1,6-hexamethylene bis-acrylamide, 1,6-hexamethylene bis. Examples include methacrylamide, diethylenetriamine trisacrylamide, xylylene bisacrylamide, and xylylene bismethacrylamide.

  Examples of other preferable amide monomers include those having a cyclohexylene structure described in JP-B No. 54-21726.

  In addition, urethane-based addition polymerizable compounds produced by using an addition reaction of isocyanate and hydroxyl group are also suitable, and specific examples thereof include, for example, one molecule described in JP-B-48-41708. A vinyl urethane containing two or more polymerizable vinyl groups in one molecule obtained by adding a vinyl monomer containing a hydroxyl group represented by the following general formula (i) to a polyisocyanate compound having two or more isocyanato groups. Compounds and the like.

_{CH 2 = C (R) COOCH} 2 CH (R ') OH (i)
(However, R and R ′ each represent H or CH _3. )

  Further, urethane acrylates such as those described in JP-A-51-37193, JP-B-2-32293, JP-B-2-16765, JP-B-58-49860, JP-B-56-17654 Urethane compounds having an ethylene oxide skeleton described in JP-B-62-39417 and JP-B-62-39418 are also suitable.

  Further, by using addition polymerizable compounds having an amino structure in the molecule described in JP-A-63-277653, JP-A-63-260909, and JP-A-1-105238, a short time can be obtained. A cured composition can be obtained.

  Other examples include reacting polyester acrylates, epoxy resins and (meth) acrylic acid as described in JP-A-48-64183, JP-B-49-43191 and JP-B-52-30490. And polyfunctional acrylates and methacrylates such as epoxy acrylates. Further, specific unsaturated compounds described in JP-B-46-43946, JP-B-1-40337, JP-B-1-40336, and vinylphosphonic acid compounds described in JP-A-2-25493 are also included. be able to. In some cases, a structure containing a perfluoroalkyl group described in JP-A-61-22048 is preferably used. Furthermore, the Japan Adhesion Association magazine vol. 20, no. 7, pages 300 to 308 (1984), which are introduced as photocurable monomers and oligomers, can also be used.

  Examples of the vinyl compound include butanediol-1,4-divinyl ether, ethylene glycol divinyl ether, 1,2-propanediol divinyl ether, 1,3-propanediol divinyl ether, 1,3-butanediol divinyl ether, 1,4 -Butanediol divinyl ether, neopentyl glycol divinyl ether, trimethylolpropane trivinyl ether, trimethylol ethane trivinyl ether, hexanediol divinyl ether, tetraethylene glycol divinyl ether, pentaerythritol divinyl ether, pentaerythritol trivinyl ether, pentaerythritol tetravinyl ether, Sorbitol tetravinyl ether, sorbitol pentavinyl ether, ethylene glycol Diethylene vinyl ether, ethylene glycol dipropylene vinyl ether, trimethylolpropane triethylene vinyl ether, trimethylolpropane diethylene vinyl ether, pentaerythritol diethylene vinyl ether, pentaerythritol triethylene vinyl ether, pentaerythritol tetraethylene vinyl ether, 1,1,1-tris [4- ( 2-vinyloxyethoxy) phenyl] ethane, bisphenol A divinyloxyethyl ether, divinyl adipate and the like.

The resin sheet used for this invention and the resin composition used for the formation may use only 1 type of polymeric compounds, and may use 2 or more types together.
The content of the polymerizable compound in the resin sheet used in the present invention is preferably from 0.1 to 30% by mass, more preferably from 0.5 to 20% by mass, based on the total solid content of the resin composition. More preferably, it is 10 mass%.
As for content of the polymeric compound in the resin composition for resin sheet formation used for this invention, 0.1-30 mass% is preferable with respect to solid content total mass of a resin composition, 0.5-20 mass% Is more preferable, and 1-10 mass% is still more preferable. Within the above range, the rinsing property of engraving residue generated during laser engraving is excellent, and the printing durability of the printing plate obtained is excellent.

(Amount of each component)
The total content of the specific polymer in the resin sheet is preferably 5 to 90% by mass and the content of the polymerization initiator is 0.01 to 30% by mass with respect to the total solid content of the resin sheet used in the present invention. The content of the photothermal conversion agent is preferably in the range of 0.01 to 30% by mass, and the content of the polymerizable compound is preferably 0 to 30% by mass.
The total content of the specific polymer in the resin composition for forming a resin sheet is preferably 5 to 90% by mass with respect to the total solid content of the resin composition for forming a resin sheet used in the present invention, and a polymerization initiator. The content of is preferably 0.01 to 30% by mass, the content of the photothermal conversion agent is preferably in the range of 0.01 to 30% by mass, and the content of the polymerizable compound is 0 to 30% by mass. % Is preferred.

(Resin sheet curing method)
Hereinafter, the resin sheet curing method will be described.
The resin sheet used in the present invention is preferably a sheet cured by the action of heat and / or light.
When the resin sheet used for this invention contains a photoinitiator, it can be hardened | cured by irradiating light.
The light irradiation is preferably performed on the entire surface of the resin sheet.
Examples of light include visible light, ultraviolet light, and electron beam, but ultraviolet light is most preferable. If the support side of the resin sheet is the back side, the surface may only be irradiated with light. However, if the support is a transparent film that transmits light, it is preferable that the back side is further irradiated with light. When the protective film exists, the irradiation from the surface may be performed while the protective film is provided, or may be performed after the protective film is peeled off. When there is a possibility that the crosslinking reaction may be inhibited in the presence of oxygen, light irradiation may be performed after the resin sheet is covered with a vinyl chloride sheet and evacuated.
When the resin sheet contains a thermal polymerization initiator (the above-mentioned photopolymerization initiator can also be a thermal polymerization initiator), it can be cured by heating the resin sheet (crosslinking by heat). ). Examples of the heating means for performing crosslinking by heat include a method of heating a resin sheet for a predetermined time in a hot air oven or a far infrared oven, and a method of contacting a heated roll for a predetermined time.

As the resin sheet curing method, crosslinking by heat is preferable from the viewpoint that the resin sheet can be uniformly cured (crosslinked) from the surface to the inside.
By crosslinking the resin sheet, there is an advantage that firstly the relief formed after laser engraving becomes sharp, and secondly, the adhesiveness of engraving residue generated during laser engraving is suppressed.

[Adhesive layer forming step]
The adhesive layer forming step is a step of forming an adhesive layer by applying and drying an undercoat liquid serving as an adhesive layer on at least a part of the back surface of the prepared flexographic printing plate precursor.
The method for applying the undercoat liquid is not particularly limited, and a known coating method can be used as appropriate.

(Undercoat liquid)
The undercoat liquid forms an adhesive layer having a water droplet contact angle of 77 to 93 degrees.
The undercoat liquid includes a solvent and a resin that is a material for forming the adhesive layer.
The resin used as the material for forming the adhesive layer preferably includes a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group. It is more preferable to include a resin having a (meth) acryloyloxy group, a halogen (particularly chlorine) group, or an epoxy group. Specifically, it is particularly preferable that the resin contains a (meth) acrylic acid polymer or chlorinated polyolefin and an epoxy resin.
Specific examples of the solvent include cyclohexane, ethanol, ethyl acetate, isobutyl acetate, vinyl acetate, methyl alcohol, toluene, xylene, ethylbenzene, methyl isobutyl ketone, and the like. Or two or more of them may be used in combination.
The concentration of the resin in the undercoat liquid, that is, the solid content concentration is preferably 0.1% by mass to 10% by mass, more preferably 0.15% by mass to 3% by mass, and 0.2% by mass. ˜1% by weight is particularly preferred.

[Method for producing flexographic printing plate with adhesive layer]
Next, the manufacturing method of the flexographic printing plate of this invention is demonstrated in detail.
The method for producing the flexographic printing plate of the present invention comprises:
A printing plate having a support and a relief layer formed on the support, and preparing a flexographic printing plate having a back surface opposite to the surface on which the relief layer is formed of polyethylene terephthalate A preparation process;
An adhesive layer forming step of applying an undercoat liquid to be an adhesive layer on at least a part of the back surface of the support of the flexographic printing plate, and forming an adhesive layer;
It is a manufacturing method in which the water droplet contact angle of the adhesive layer formed in the adhesive layer forming step is 77 degrees to 93 degrees.
The adhesive layer forming step in the method for manufacturing the flexographic printing plate with an adhesive layer is the same as the adhesive layer forming step in the method for manufacturing the flexographic printing plate precursor with an adhesive layer, and the description thereof is omitted.

[Preparation process for printing plate]
The printing plate preparation step is a step of preparing a flexographic printing plate having a support having at least a back surface made of PET and a relief layer formed on a surface opposite to the back surface.
In the present invention, the method for preparing the flexographic printing plate is not particularly limited, and the flexographic printing plate may be prepared and prepared by a known production method.
As an example, the flexographic printing plate is formed by engraving the relief forming layer of the flexographic printing plate precursor prepared in the printing plate precursor preparation step by laser engraving, thereby removing the cured layer of the portion to be a non-image part, It can be produced by forming an image portion. When producing the image area, the hardened layer is removed in the image area in accordance with the predetermined number of screen lines and the desired halftone dot ratio to form a large number of small dots to form a halftone dot section. May be.

Specifically, as an example of a method for manufacturing a flexographic printing plate, first, original image data of a printing plate to be produced is acquired, and this original image data is converted into data for laser engraving. Processor) processing, and further, mask processing or the like is performed on the image data subjected to RIP processing to generate output image data.
Laser engraving is performed using the output image data to produce a flexographic printing plate.

The laser engraving method is basically the same as the laser engraving method used in the conventional flexographic printing plate manufacturing method.
As a laser engraving method, for example, a sheet-shaped flexographic printing plate precursor is wound around the outer peripheral surface of a drum having a cylindrical shape, and the drum is rotated. A method of engraving (recording) a two-dimensional image on the surface of a printing plate precursor at high speed by emitting a laser beam and scanning the exposure head at a predetermined pitch in the sub-scanning direction orthogonal to the main scanning direction is used. Is possible.

The type of laser used in laser engraving is not particularly limited, but an infrared laser is preferably used. When irradiated with an infrared laser, the molecules in the cured layer undergo molecular vibrations and generate heat. When a high-power laser such as a carbon dioxide laser or YAG (Yttrium Aluminum Garnet) laser is used as an infrared laser, a large amount of heat is generated in the laser irradiation area, and molecules in the cured layer are selectively cut by molecular cutting or ionization. Removal, ie engraving. The advantage of laser engraving is that the engraving depth can be set arbitrarily, so that the structure can be controlled three-dimensionally. For example, a portion that prints fine halftone dots can be engraved shallowly or with a shoulder so that the relief does not fall down due to printing pressure, and a portion of a groove that prints fine punched characters is engraved deeply As a result, the ink is less likely to be buried in the groove, and it is possible to suppress the crushing of the extracted characters.
Among them, when engraving with an infrared laser corresponding to the absorption wavelength of the photothermal conversion agent, the cured layer can be selectively removed with higher sensitivity, and a relief layer having a sharp image can be obtained.

The infrared laser is preferably a carbon dioxide laser (CO ₂ laser) or a semiconductor laser from the viewpoint of productivity, cost, etc., and a semiconductor infrared laser with a fiber (FC-LD) is particularly preferable. In general, a semiconductor laser can be downsized with high efficiency and low cost in laser oscillation compared to a CO ₂ laser. Moreover, since it is small, it is easy to form an array. Furthermore, the beam shape can be controlled by processing the fiber.
The semiconductor laser preferably has a wavelength of 700 to 1,300 nm, more preferably 800 to 1,200 nm, still more preferably 860 to 1,200 nm, and particularly preferably 900 to 1,100 nm.
In addition, a semiconductor laser with a fiber is effective for laser engraving because it can efficiently output laser light by further attaching an optical fiber. Furthermore, the beam shape can be controlled by processing the fiber. For example, the beam profile can have a top hat shape, and energy can be stably given to the plate surface. Details of the semiconductor laser are described in “Laser Handbook 2nd Edition” edited by Laser Society, “Practical Laser Technology” edited by IEICE.
Moreover, the plate making apparatus provided with the fiber-attached semiconductor laser described in detail in JP-A-2009-172658 and JP-A-2009-214334 may be suitably used in the method for producing a flexographic printing plate of the present invention. it can.

  In the present invention, the method for producing a flexographic printing plate is not limited to laser engraving (DLE (Direct Laser Engraving) method), and LAMS (Laser Ablation Masking System) that writes and develops an image on the surface of the printing plate precursor with a laser. ) Various known manufacturing methods such as a method can be used.

Moreover, the manufacturing method of a flexographic printing plate may include the following rinse process, a drying process, and / or a post-crosslinking process as needed after the engraving process.
Rinsing step: a step of rinsing the engraved surface of the relief layer surface after engraving with water or a liquid containing water as a main component.
Drying step: a step of drying the engraved relief layer.
Post-crosslinking step: a step of imparting energy to the relief layer after engraving and further crosslinking the relief layer.
Since the engraving residue is attached to the engraving surface after the engraving step, a rinsing step of rinsing the engraving residue by rinsing the engraving surface with water or a liquid containing water as a main component may be added. As a means of rinsing, there is a method of washing with tap water, a method of spraying high-pressure water, and a known batch type or conveying type brush type washing machine as a photosensitive resin relief printing machine. For example, when the engraving residue cannot be removed, a rinsing liquid to which soap or a surfactant is added may be used.
When the rinsing process for rinsing the engraving surface is performed, it is preferable to add a drying process for drying the engraved relief layer and volatilizing the rinsing liquid.
Further, if necessary, a post-crosslinking step for further crosslinking the engraved relief layer may be added. By performing the post-crosslinking step, which is an additional cross-linking step, the relief layer formed by engraving can be made stronger.

The pH of the rinsing liquid used in the rinsing step is preferably 9 or more, more preferably 10 or more, and still more preferably 11 or more. The pH of the rinsing liquid is preferably 14 or less, more preferably 13.5 or less, and still more preferably 13.1 or less. Handling is easy in the said range. What is necessary is just to adjust pH using an acid and / or a base suitably in order to make a rinse liquid into said pH range, and the acid and base to be used are not specifically limited.
Moreover, it is preferable that a rinse liquid contains water as a main component. Moreover, the rinse liquid may contain water miscible solvents, such as alcohol, acetone, tetrahydrofuran, etc. as solvents other than water.

It is preferable that the rinse liquid contains a surfactant. As surfactants, betaines such as carboxybetaine compounds, sulfobetaine compounds, phosphobetaine compounds, amine oxide compounds, or phosphine oxide compounds from the viewpoint of reducing engraving residue removal and the effect on flexographic printing plates. Preferred examples include compounds (amphoteric surfactants). In the present invention, N = O amine oxide compound, and, each structure of the P = O phosphine oxide ^{compounds, N + -O -, P +} -O - shall be regarded as.
Examples of the surfactant include known anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. Furthermore, fluorine-based and silicone-based nonionic surfactants can be used in the same manner.
Surfactant may be used individually by 1 type, or may use 2 or more types together.
Although the usage-amount of surfactant does not need to specifically limit, it is preferable that it is 0.01-20 mass% with respect to the total mass of a rinse liquid, and it is more preferable that it is 0.05-10 mass%.

  The thickness of the relief layer (cured layer) of the prepared flexographic printing plate is preferably 0.05 mm or more and 10 mm or less from the viewpoint of satisfying various printability such as abrasion resistance and ink transferability. 05 mm or more and 7 mm or less are more preferable, and 0.05 mm or more and 3 mm or less are particularly preferable.

Moreover, it is preferable that the Shore A hardness of the relief layer which the produced flexographic printing plate has is 50 degree or more and 90 degrees or less. When the Shore A hardness of the relief layer is 50 ° or more, even if the fine halftone dots formed by engraving are subjected to the strong printing pressure of the relief printing press, they do not collapse and can be printed normally. In addition, when the Shore A hardness of the relief layer is 90 ° or less, it is possible to prevent faint printing in a solid portion even in flexographic printing with a kiss touch.
The Shore A hardness in the present specification is a durometer (spring type) in which an indenter (called a push needle or indenter) is pushed and deformed on the surface of the object to be measured, and the amount of deformation (pushing depth) is measured and digitized. It is a value measured by a rubber hardness meter.

[Manufacturing method of laminated structure]
Next, the manufacturing method of the laminated structure of this invention is demonstrated in detail.
The manufacturing method of the laminated structure of the present invention includes the flexographic printing plate with an adhesive layer prepared by the above-described manufacturing method of the flexographic printing plate with an adhesive layer, or the adhesive prepared by the above-described manufacturing method of the flexographic printing plate precursor with an adhesive layer. This is a manufacturing method in which a layered flexographic printing plate precursor is wound around a circumferential surface of a cylindrical sleeve via a cushion tape having adhesiveness on both sides and laminated to produce a laminated structure.

  Specifically, as shown in FIG. 4, the flexographic printing plate 10 with an adhesive layer (adhesion) is formed with a cylindrical sleeve 32 having a cushion tape 34 wound around its peripheral surface and the support 12 side facing the cushion tape layer 34. The laminated structure 30 can be produced by winding the layered flexographic printing plate precursor 20) and laminating it on the cushion tape layer.

The laminated structure having the flexographic printing plate precursor is then installed in a laser engraving apparatus, and the relief forming layer is laser engraved to form a laminated structure having a flexographic printing plate.
In this case, the flexographic printing plate after laser engraving may be installed in a flexographic printing apparatus as a laminated structure and used for printing, or may be peeled off from the cushion tape layer for printing on another flexographic printing apparatus. May be used.

  In addition, the manufacturing method of the laminated structure includes a flexographic printing plate or a flexographic printing plate precursor provided with an adhesive layer on the back surface of the flexographic printing plate or the flexographic printing plate precursor with the adhesive layer via a cushion tape. There is no limitation on the method of winding around the sleeve, and an adhesive layer is formed by applying an undercoat liquid onto the cushion tape layer wound around the sleeve, and the flexographic printing plate or flexographic printing plate precursor is formed on the adhesive layer. You may produce by the method of laminating | stacking.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these.
In addition, the number average molecular weight (Mn) and the weight average molecular weight (Mw) of the polymer in an Example have shown the value measured by GPC method unless there is particular notice.

<Example 1>
<Preparation of resin composition for forming resin sheet>
Using a MS-type small pressure kneader (manufactured by Moriyama Co., Ltd.), as a diene polymer, MITSUI EPT1045 (EPDM (Mooney viscosity (ML _{1 + 4} , 100 ° C.): 38, ethylene content: 58 mass%, diene content: 5% by mass, diene species: dicyclopentadiene (DCPD), manufactured by Mitsui Chemicals, Inc.) and carbon black, SEAST 9 (produced by Tokai Carbon Co., Ltd. (average particle size: 19 nm, nitrogen adsorption specific surface area: 142 m ² / g)) and hydrophobic fumed silica AEROSIL R-972 (produced by Nippon Aerosil Co., Ltd., nitrogen adsorption specific surface area: 110 ± 20 m ² / g) as a filler at 80 ° C., front blade 35 rpm, rear After kneading at a blade of 35 rpm for 10 minutes, the mixture was cooled to 60 ° C. and park mill D-40 ( An organic peroxide, dicumyl peroxide (40% by mass), manufactured by NOF Corporation) was added, and the mixture was kneaded at 60 ° C. with a front blade 20 rpm and a rear blade 20 rpm for 10 minutes, and a resin composition for forming a resin sheet A product was prepared.

<Preparation of relief forming layer>
The resin composition for forming a resin sheet obtained above was molded into a sheet shape with a calender roll (four reverse L-shapes manufactured by Nippon Roll Manufacturing Co., Ltd.). The resin composition for forming a resin sheet was preliminarily kneaded for 10 minutes at a warm-up roll of 50 ° C., the one wound around the roll was cut in the middle, drawn out into a sheet, and once wound up into a roll. Thereafter, the kneaded material was set between the first roll and the second roll of the calender roll, and rolled. As for the temperature of each roll of the calendar roll, the first roll temperature was 50 ° C., the second roll temperature was 60 ° C., the third roll temperature was 70 ° C., and the fourth roll temperature was 80 ° C. The roll interval was 1.0 mm between the first roll and the second roll, 0.9 mm between the second roll and the third roll, and 0.8 mm between the third roll and the fourth roll. The conveyance speed was 1 m / min.
After passing through the fourth roll, the sheet was cut into a width of 440 mm and a length of 1200 mm, and heated at 160 ° C. for 20 minutes at a pressure of 4 MPa using a press machine (SA-303 manufactured by Tester Sangyo Co., Ltd.). A relief forming layer having a thickness of 0.92 mm was obtained.

<Preparation of flexographic printing plate precursor>
A photocurable composition (manufactured by ThreeBond Co., Ltd .: 3030) was applied to the relief forming layer obtained above so that the average film thickness was 100 μm, and then a 125 μm-thick PET support was formed using a nip roller. After 20 seconds of bonding, the photocurable layer was cured from the PET support side with a UV exposure machine (UV exposure machine ECS-151U manufactured by Eye Graphics Co., Ltd., metal halide lamp, 1,500 mJ / cm ² , 14 sec exposure). A flexographic printing plate precursor was prepared.

<Preparation of flexographic printing plate>
With respect to the flexographic printing plate precursor obtained above, a resolution of 2540 dpi (dot per inch), laser power (Depth power) is obtained by a laser engraving machine (1300S manufactured by Hell Gravure Systems) so that the shape of the image portion becomes a predetermined shape. ) 100%, dot shape profile: Sculpture at a slope of 60 °, then hang a cleaning agent (2% aqueous solution of Joy W sterilization manufactured by The Procter & Gamble Company) on the plate, rub with a pig hair brush Then, the engraving residue was removed by washing with water to prepare a flexographic printing plate.

<Preparation of undercoat liquid>
The undercoat liquid was prepared by diluting 3M company: 94 primer 10 times with ethyl acetate, that is, mixing 3M company 94 primer and ethyl acetate in a mass ratio of 1: 9.
In addition, 94 primer made from 3M company contains acrylic acid polymer, chlorinated polyolefin, and an epoxy resin as solid content, and solid content concentration is about 3.85 mass%. Therefore, the solid content concentration of the prepared undercoat liquid is 0.38% by mass.

<Formation of adhesive layer>
The prepared undercoat liquid was applied to each of the two opposite long sides of the back surface of the PET support of the flexographic printing plate and dried to form an adhesive layer to obtain a flexographic printing plate with an adhesive layer.
The width of the adhesive layer was 5 mm.
Further, the water droplet contact angle of the formed adhesive layer was measured from the angle formed by the surface and the water droplet after 20 seconds after dropping a 3 mm diameter pure water droplet on the surface. The water droplet contact angle was 93 degrees.

<Production of laminated structure>
Next, the flexographic printing plate with the adhesive layer obtained above was wound around a cylindrical sleeve having a cushion tape wound around the peripheral surface, and laminated on the cushion tape layer to produce a laminated structure.
The sleeve was 440 mm in circumference and 1300 mm in length.
Moreover, as a cushion tape, Duploflex 5.2 (Roman company thickness 5.5mm) which has an acrylic adhesive layer on both surfaces was used.

Here, the 90-degree peeling force between the PET support provided with the adhesive layer and the cushion tape was measured using a sample.
The sample size was 10 × 100 mm. After bonding the PET support with the adhesive layer and the cushion tape using a roller, one end of the PET support is peeled off, and the one end of the PET support that is peeled off on the chuck of the tensile tester is fixed. Secure the cushion tape to the other chuck. The test machine was operated, the PET support was pulled in the direction of 90 degrees at 50 mm / min, and the measured values of the peel force of 50 mm length peeled off were averaged to obtain the 90 degree peel force.
The 90 degree peeling force was 6.0 N / cm.

<Examples 2-7, Comparative Examples 1-5>
A laminated structure was produced in the same manner as in Example 1 except that the mixing ratio of 94 primer and ethyl acetate in the undercoat liquid was changed as shown in Table 1 below.

<Example 8>
A laminated structure was produced in the same manner as in Example 1 except that a solution obtained by diluting Super Excel Primer manufactured by East Japan Paint Co., Ltd. with MEK (methyl ethyl ketone) was used as the undercoat liquid.

<Comparative Example 6>
A laminated structure was produced in the same manner as in Example 1 except that no adhesive layer was formed.

[Evaluation]
After printing using the obtained laminated structure, ink was washed on the plate and the adhesion was evaluated. Moreover, the printing plate was peeled off after printing, and peelability was evaluated.

(Printing process)
As a printing machine, a TLF-270-4F type printing machine (manufactured by Taiyo Machinery Co., Ltd.) was used. The obtained laminated structure was inserted through a shaft and installed in a printing machine. Thereafter, the kiss touch (printing pressure at which the entire image starts to fill) was set to 0 (reference printing pressure), and printing was performed at a printing speed of 150 m / min for 10 minutes under a condition of 40 μm being pressed.
A 50 μm OPP film (manufactured by Abe Paper Industry Co., Ltd.) was used as the printing medium. As the ink, water-based flexographic ink, Hydrick FCF (manufactured by Dainichi Seika Co., Ltd.) was used.

(Adhesiveness)
After printing, the laminated structure was taken out from the printing machine, the ink remaining on the printing plate was washed, and the adhesiveness was evaluated by whether or not the flexographic printing plate peeled off during washing.
The ink was washed using a washing machine (SL2200 made by Flexowash), the taken-out laminated structure was set in the washing machine, and a washing solution: Joy W (made by The Procter & Gamble Company) 5% aqueous solution, washing time: 5 Washing was performed under the conditions of minutes, drying time: 0.5 hour.
The case where the flexographic printing plate is not peeled after ink washing is designated as “A”, and the case where the peel width at the end of the flexographic printing plate where the adhesive layer is formed is less than 10% of the width of the adhesive layer. B ”and the case where the peel width was 10% or more was evaluated as“ C ”.

(Peelability)
The flexographic printing plate was peeled off at a standard peeling speed (about 40 cm / sec) from the laminated structure whose adhesion was confirmed, and the state of the flexographic printing plate and the cushion tape after peeling was evaluated according to the following criteria.
A: No damage to printing plate and cushion tape B: Some distortion in printing plate and / or cushion tape C: Damage to printing plate and / or cushion tape (cut, stretch, break)
The evaluation results are shown in Table 1.

From the results shown in Table 1, Examples 1 to 8 of the present invention, in which an adhesive layer having a water droplet contact angle of 77 to 93 degrees is provided on the back surface of the PET support, are flexographic printing plates and cushion tapes as compared with the comparative examples. It can be seen that the adhesive property is excellent and the releasability when the flexographic printing plate is peeled is also good.
When the water droplet contact angle of Comparative Examples 1 to 3 is more than 93 degrees, the 90-degree peeling force is too large, and thus the cushion tape is damaged when the flexographic printing plate is peeled off from the cushion tape after printing.
On the other hand, when the water droplet contact angle of Comparative Examples 4 to 6 was less than 77 degrees, the 90 degree peeling force was too small, and the flexographic printing plate was peeled off during cleaning.

Moreover, from the comparison between Examples 1 and 7 and Examples 2 to 6, it can be seen that the water droplet contact angle of the adhesive layer is more preferably 80 to 91 degrees.
The effects of the present invention are clear from the above results.

DESCRIPTION OF SYMBOLS 10 Flexo printing plate with adhesive layer 11 Flexo printing plate 12 Support body 14 Relief layer 14a Image part 14b Non-image part 16 Adhesive layer 20 Flexo printing plate precursor with adhesive layer 21 Flexographic printing plate precursor 22 Relief forming layer 30 Laminated structure 32 Sleeve 34 Cushion Tape Layer 50 Flexo Printing Device 51 Shaft 52 Conveying Roller 53 Anilox Roller 54 Doctor Chamber 55 Circulating Tank 60 Calendar Roll 62a to 62d First Roll to Fourth Roll 70 Kneaded Material 71 Resin Sheet z Printed Material

Claims (15)

A flexographic printing plate having a support and a relief layer formed on the support;
An adhesive layer formed on at least a part of the back surface of the support of the flexographic printing plate opposite to the surface on which the relief layer is formed;
The back surface of the support is composed of polyethylene terephthalate,
The flexographic printing plate with an adhesive layer, wherein a water droplet contact angle of the adhesive layer is 77 to 93 degrees.   The flexographic printing plate with an adhesive layer according to claim 1, wherein the adhesive layer has a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group. . A flexographic printing plate precursor having a support and a relief-forming layer formed on the support;
An adhesive layer formed on at least a part of the back surface of the support of the flexographic printing plate precursor opposite to the surface on which the relief forming layer is formed;
The back surface of the support is composed of polyethylene terephthalate,
The flexographic printing plate precursor with an adhesive layer, wherein a water droplet contact angle of the adhesive layer is 77 to 93 degrees.   The flexographic printing plate with an adhesive layer according to claim 3, wherein the adhesive layer has a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group. Original edition. A cylindrical sleeve;
A cushion tape layer having adhesiveness on both sides, wound and laminated on the peripheral surface of the sleeve;
An adhesive layer laminated on at least a part of the cushion tape layer;
A support that is at least partially laminated on the adhesive layer;
A relief layer or a relief forming layer formed on the support,
The back surface of the support, which is the surface on the adhesive layer side, is composed of polyethylene terephthalate,
The laminated structure according to claim 1, wherein the contact angle of water droplets of the adhesive layer is 77 to 93 degrees.   The laminated structure according to claim 5, wherein the adhesive layer has a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group.   The laminated structure according to claim 5 or 6, wherein the adhesive layer is formed on two circumferential sides of the back surface of the support.   The laminated structure according to claim 7, wherein a width of the adhesive layer in a circumferential direction is 1 mm to 100 mm. A flexographic printing plate having a support and a relief layer formed on the support, the back surface of the support being opposite to the surface on which the relief layer is formed is made of polyethylene terephthalate is prepared. Printing plate preparation process,
An adhesive layer forming step of applying an undercoat liquid to be an adhesive layer on at least a part of the back surface of the support of the flexographic printing plate, and forming the adhesive layer;
The method for producing a flexographic printing plate with an adhesive layer, wherein a water droplet contact angle of the adhesive layer formed in the adhesive layer forming step is 77 to 93 degrees.   The flexographic printing plate with an adhesive layer according to claim 9, wherein the undercoat liquid contains a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group. Manufacturing method. The undercoat liquid contains the resin and a solvent,
The solvent is at least one selected from the group consisting of cyclohexane, ethanol, ethyl acetate, isobutyl acetate, vinyl acetate, methyl alcohol, toluene, xylene, ethylbenzene, and methyl isobutyl ketone;
The method for producing a flexographic printing plate with an adhesive layer according to claim 10, wherein the concentration of the resin is 0.1 mass% to 10 mass%. A flexographic printing plate comprising a support and a relief forming layer formed on the support, wherein the back surface of the support opposite to the surface on which the relief forming layer is formed is composed of polyethylene terephthalate A printing plate precursor preparation process for preparing an original plate;
An adhesive layer forming step of applying an undercoat liquid to be an adhesive layer on at least a part of the back surface of the support of the flexographic printing plate precursor, and forming the adhesive layer;
A method for producing a flexographic printing plate precursor with an adhesive layer, wherein a water droplet contact angle of the adhesive layer formed in the adhesive layer forming step is 77 to 93 degrees.   The flexographic printing plate with an adhesive layer according to claim 12, wherein the undercoat liquid contains a resin containing at least one of a (meth) acryloyloxy group, a halogen group, a carboxy group, a hydroxyl group, a silyl group, and an epoxy group. Manufacturing method. The undercoat liquid contains the resin and a solvent,
The solvent is at least one selected from the group consisting of cyclohexane, ethanol, ethyl acetate, isobutyl acetate, vinyl acetate, methyl alcohol, toluene, xylene, ethylbenzene, and methyl isobutyl ketone;
The method for producing a flexographic printing plate precursor with an adhesive layer according to claim 13, wherein the concentration of the resin is 0.1 mass% to 10 mass%.   The flexographic printing plate with an adhesive layer produced by the method for producing a flexographic printing plate with an adhesive layer according to any one of claims 9 to 11, or the adhesive layer with an adhesive layer according to any one of claims 12 to 14. A flexographic printing plate precursor with an adhesive layer produced by the method for producing a flexographic printing plate precursor is wrapped around a circumferential surface of a cylindrical sleeve via an adhesive cushion tape on both sides to produce a laminated structure A method for manufacturing a laminated structure.