JP2019094440A - Pressure-sensitive adhesive sheet with release liner and release liner - Google Patents

Abstract

To provide a pressure-sensitive adhesive sheet with release liner having excellent air release capability at the time of installation and excellent repositioning aptitude and a release liner capable of using in the adhesive sheet.SOLUTION: A pressure-sensitive adhesive sheet 1 with a release liner obtained by laminating a release liner 10, an adhesive layer 20 and a base sheet 30 in this order, the pressure-sensitive adhesive sheet 1 with a release liner having the release liner 10 having a plurality of stripe-shaped projections 11 parallel each other on a release treatment surface in contact with the adhesive layer 20, a width 12 of the stripe-shaped projection 11 of 10 to 150 μm, a height 13 of the stripe-shaped projection 11 of 5 to 40 μm, a center line distance 14 of the stripe-shaped projections 11 each other of 200 to 1000 μm, a convexoconcave part 15 provided between the stripe-shaped projection parts 11 each other, and a maximum height roughness Rz of the convexoconcave part 15 larger than 3 μm, and smaller than a height 13 of the stripe-shaped projection part 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure-sensitive adhesive sheet with a release liner and a release liner that can be used therefor.

  An adhesive sheet with a release liner in which a release liner is laminated on a substrate sheet via an adhesive layer is used for applications such as decoration and display. Such a decorative or display pressure-sensitive adhesive sheet is widely spread instead of the conventional method of decoration or display by painting, since it is sufficient to peel off the release liner and attach the pressure-sensitive adhesive layer to the adherend at the time of construction. There is.

  When the pressure-sensitive adhesive sheet has a large area, air buildup tends to occur between the pressure-sensitive adhesive layer and the adherend at the time of construction, which may impair the appearance of the pressure-sensitive adhesive sheet. There is also known a technique in which air can be communicated between the pressure-sensitive adhesive layer and the adherend by providing the uneven portion on the surface of the release liner (Patent Documents 1 and 2).

JP 07-224254 A Japanese Patent Application Laid-Open No. 07-278508

  These pressure-sensitive adhesive sheets with release liners are provided with asperities capable of communicating air on the surface of the pressure-sensitive adhesive layer, and high adhesion is expected, but once applied to an adherend, subsequent positional adjustment and repositioning Is difficult and repositioning is difficult.

  An object of the present invention is to provide a pressure-sensitive adhesive sheet with a release liner, which is excellent in air release during construction and excellent in repositioning suitability, and a release liner which can be used therefor.

  In order to solve the above problems, the inventors of the present invention have conducted intensive studies to find that a release liner, a pressure-sensitive adhesive layer, and a substrate sheet are laminated in this order, and the release liner is a pressure-sensitive adhesive sheet. The object is achieved by providing a plurality of stripe-shaped convex portions parallel to each other in a predetermined size on the peeling treated surface, and providing an uneven portion with a predetermined size also between the stripe-shaped convex portions. I found it to be possible.

That is, the present invention provides the following release-lined PSA sheet and a release liner that can be used therefor.
[1] A release liner-attached pressure-sensitive adhesive sheet comprising a release liner, a pressure-sensitive adhesive layer and a substrate sheet laminated in this order,
The release liner has a plurality of stripe-shaped convex portions parallel to each other on the release-treated surface in contact with the pressure-sensitive adhesive layer,
The width of the striped convex portion is 10 to 150 μm, and the height of the striped convex portion is 5 to 40 μm,
The centerline distance between the stripe-shaped convex portions is 200 to 1000 μm,
A pressure-sensitive adhesive sheet with a release liner is provided between the stripe-shaped protrusions, and the maximum height roughness Rz of the protrusions is larger than 3 μm and smaller than the height of the stripe-shaped protrusions. .

[2] The pressure-sensitive adhesive sheet with a release liner according to the above [1], wherein the heights of the uneven portions are uneven.
[3] A plurality of stripe-shaped convex portions parallel to one another are provided on the peeling treated surface,
The width of the striped convex portion is 10 to 150 μm, and the height of the striped convex portion is 5 to 40 μm,
The centerline distance between the stripe-shaped convex portions is 200 to 1000 μm,
A release liner, wherein a concavo-convex portion is provided between the stripe-shaped convex portions, and the maximum height roughness Rz of the concavo-convex portion is larger than 3 μm and smaller than the height of the stripe-shaped convex portion.

  According to the release liner-attached pressure-sensitive adhesive sheet of the present invention, a pressure-sensitive adhesive sheet which is excellent in air release during construction and excellent in repositioning suitability and a release liner that can be used for the pressure-sensitive adhesive sheet are provided.

It is a cross-sectional schematic diagram which shows one Embodiment of the adhesive sheet with the peeling liner of this invention. FIG. 2 is a schematic perspective view showing a release liner of the release liner-attached pressure-sensitive adhesive sheet of an embodiment of the present invention. It is a cross-sectional schematic diagram which shows an example of the usage method of an adhesive sheet.

<< Adhesive sheet with release liner >>
The release liner-attached pressure-sensitive adhesive sheet of the present invention will be described with reference to the drawings. Note that the drawings used in the following description may be enlarged for convenience, in order to make the features of the present invention intelligible. Not necessarily.

FIG. 1 is a cross-sectional view schematically showing an embodiment of a release liner-attached pressure-sensitive adhesive sheet of the present invention. FIG. 2 is a schematic perspective view showing a release liner in the release-lined PSA sheet.
The release liner-attached pressure-sensitive adhesive sheet 1 shown here is formed by laminating the release liner 10, the pressure-sensitive adhesive layer 20 and the base sheet 30 in this order, and the release liner 10 is parallel to each other on the release-treated surface in contact with the pressure-sensitive adhesive layer A plurality of stripe-shaped convex portions 11, the width 12 of the stripe-shaped convex portions 11 is 10 to 150 .mu.m, the height 13 of the stripe-shaped convex portions 11 is 5 to 40 .mu.m, Center-line spacing 14 is 200 to 1000 μm, and concavo-convex part 15 is provided between stripe-shaped convex parts 11; maximum height roughness Rz of concavo-convex part 15 is larger than 3 μm and stripe-shaped convex part It is smaller than the height 13 of 11.

  FIG. 3: is a cross-sectional schematic diagram which shows an example of the usage method of an adhesive sheet. When using the release liner-attached pressure-sensitive adhesive sheet 1, the release liner 10 is peeled off, and the side of the remaining pressure-sensitive adhesive sheet 40 on the pressure-sensitive adhesive layer 20 is brought into contact with the adherend 50. The release liner 10 has a plurality of stripe-shaped convex portions 11 parallel to each other on the release-treated surface in contact with the pressure-sensitive adhesive layer 20, whereby the surface of the pressure-sensitive adhesive layer 20 bonded to the surface of the release liner 10 is Since a plurality of stripe-shaped concave portions 22 parallel to each other are formed and the stripe-shaped concave portions 22 are provided, air can be easily removed by applying pressure while applying with a squeegee or a finger at the time of construction. Since air accumulation does not occur, it can be easily attached cleanly with good adhesion. In addition, the transfer liner 24 has the concavo-convex part 15 between the stripe-like convex parts 11 so that the transfer surface 24 having the concavo-convex of the pressure-sensitive adhesive layer 20 corresponding to the concavo-convex part 15 at the time of construction. It becomes an initial contact surface with an adherend, and can be excellent in repositioning aptitude. The pressure-sensitive adhesive sheet 40 after sticking does not have a dent or the like on the surface of the substrate sheet 30 or a raised and recessed structure, so that the appearance is not lost.

  Hereinafter, each layer which comprises the adhesive sheet with a release liner of this invention is demonstrated.

<Peeling liner>
The release liner has a plurality of stripe-shaped protrusions parallel to each other on the release treated surface.
The width of the stripe-shaped convex portion is 10 to 150 μm, preferably 20 to 130 μm, and more preferably 40 to 110 μm.

  The height of the stripe-shaped convex portion is 5 to 40 μm, preferably 10 to 30 μm, and more preferably 15 to 35 μm.

  The centerline distance between the stripe-shaped convex portions is 200 to 1000 μm, preferably 300 to 900 μm, and more preferably 400 to 800 μm.

  When the release liner has a plurality of stripe-like convex portions having the above-mentioned size, which are parallel to each other, the surface of the pressure-sensitive adhesive layer provided on the surface of the release liner has a plurality of such sizes. A stripe-shaped recess is formed, and air can be easily removed at the time of construction. The plurality of stripe-shaped convex portions are preferably formed continuously to the edge of the base sheet. The shape of the plurality of stripe-shaped convex portions of the release liner may be any shape as long as a plurality of stripe-shaped concave portions are formed on the surface of the pressure-sensitive adhesive layer and air can be easily extracted at the time of construction. The cross sections of the plurality of stripe-shaped convex portions of the release liner may be substantially square, substantially rectangular, substantially triangular, or substantially semicircular, or substantially semielliptical. It may be

  Further, it is preferable that the plurality of stripe-shaped convex portions of the release liner be parallel and regularly spaced at equal intervals. Even when the substrate sheet is transparent or translucent, the plurality of stripe-shaped convex portions are regularly spaced at equal intervals to make the plurality of stripe-shaped concave portions on the surface of the pressure-sensitive adhesive layer inconspicuous after adhesion. Can.

  The plurality of stripe-shaped convex portions 11 of the release liner 10 need only be parallel to each other, for example, as shown in FIG. And may be in the form of a grid having one another at right angles to one another, parallelograms or diamonds having ones parallel to one another and ones intersecting one another at a predetermined angle, ones parallel to one another, and one another It may be in the form of a triangle having ones that intersect at an angle.

The release liner is provided with a concavo-convex portion between the stripe-shaped convex portions.
The maximum height roughness Rz of the uneven portion is preferably more than 3 μm and more than 5 μm, and more preferably more than 7 μm. Preferably, the maximum height roughness Rz of the uneven portion is smaller than the height of the stripe-shaped convex portion and smaller than 80% of the height of the stripe-shaped convex portion, and the height of the stripe-shaped convex portion It is more preferable that it be less than 70%.

  The release liner has the above-mentioned stripe-shaped convex portion, and the uneven portion is provided between the stripe-shaped convex portions, and by setting it as the uneven portion of the above-mentioned size, the adhesive at the time of construction of the adhesive sheet By the point adhesion between the layer and the adherend, it is possible to obtain excellent air release and excellent repositioning aptitude.

  It is preferable that the heights of the asperities of the release liner be irregular. By the uneven height of the uneven portion, the repositioning aptitude can be more excellent.

  As the release liner, one obtained by release treatment on at least one surface of a release liner substrate is used. The substrate for the release liner is not particularly limited, and for example, laminated paper in which a thermoplastic resin such as polyethylene is laminated on a paper substrate such as high quality paper, glassine paper, or coated paper, or polyethylene terephthalate, polybutylene terephthalate, polyethylene Examples thereof include polyester films such as naphthalate, and plastic films such as polyolefin films such as polypropylene and polyethylene. Furthermore, the laminated film which laminated | stacked these films may be sufficient.

  Alkyd-based, silicone-based, fluorine-based, unsaturated polyester-based, polyolefin-based, wax-based, rubber-based release agents are used as the release agent used for the release treatment, and in particular, alkyd-based, silicone-based and fluorine-based release agents Is preferable because it has heat resistance.

  In order to release the surface of a film or the like to be a substrate for release liner using the above release agent, the release agent may be used as it is with no solvent, or diluted with solvent or emulsified to form a gravure coater, bar coater, air knife coater The release liner may be coated by a roll coater or the like, and the release liner coated with the release agent may be provided at normal temperature or under heating, or may be cured by an electron beam to form a release layer. The thickness of the release agent layer is not particularly limited, but is about 0.05 to 5 μm.

  The thickness of the release liner is not particularly limited, but is usually about 10 to 250 μm, preferably about 20 to 200 μm.

(Method of manufacturing release liner)
As a method for producing a release liner, a release-treated surface is provided by forming a predetermined shape on a release liner substrate by a conventionally known method using an embossing roll or the like and further applying a release agent such as silicone.
For example, after sandblasting the entire surface of the metal roll, etching is performed on a plurality of stripe-shaped concave portions parallel to one another, and the metal roll thus obtained is pressed against the release liner substrate to form a predetermined shape on the release liner substrate. Forming a plurality of strip-like convex portions 11 parallel to each other corresponding to the stripe-like concave portions of the metal roll, and sandblasting the metal roll between the stripe-like convex portions 11. The release liner 10 can be manufactured in which uneven uneven portions 15 having a height corresponding to the treated surface are provided.
In addition, the entire surface of the metal roll is etched to have a conical shape with a predetermined depth, and then a plurality of stripe-shaped recesses parallel to one another are etched, and the metal roll thus obtained is pressed against the substrate for release liner. By forming a predetermined shape on the base material and further applying a release agent, a plurality of stripe-shaped convex portions 11 parallel to each other corresponding to the stripe-shaped concave portions of the metal roll, and the stripe-shaped convex portions 11 In the meantime, the release liner 10 can be manufactured in which the uneven portion 15 having a regular height corresponding to the conical etched surface of the metal roll is provided.

<Base sheet>
There is no restriction | limiting in particular as a base material sheet used for the adhesive sheet of this invention, Various plastic sheets, paper, etc. which are conventionally used as base material sheets, such as an adhesive sheet which has an adhesive layer conventionally, can be used. A decorative layer such as printing, printing, vapor deposition, or sputtering, or a functional layer such as a hard coat, a stain prevention coat, or a gloss adjustment coat may be formed on the surface of the material.

  Examples of this plastic sheet include polyolefin resins such as polyethylene, polypropylene and various olefin copolymers, polyester resins such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate, polystyrene resins, polyvinyl chloride resins, and acrylics. Resins, polycarbonate resins, polyamide resins, polyurethane resins, fluorine resins such as polytetrafluoroethylene, polybutene, polybutadiene, polymethylpentene, ethylene vinyl acetate copolymer, ethylene (meth) acrylic acid copolymer, Ethylene (meth) acrylic acid ester copolymer, ABS resin, ionomer resin; heat containing components such as polyolefin, polyurethane, polystyrene, polyvinyl chloride, polyester, etc. Plastic elastomers and can be given a sheet made of mixtures or laminates of these resins.

These plastic sheets can also be subjected to corona treatment or primer treatment, as desired, in order to improve the adhesion to layers such as pressure-sensitive adhesive layers, printing layers and ink receiving layers provided thereon.
As paper, high-quality paper, art paper, coated paper, kraft paper etc. are used. When using paper as a base material sheet, the basis weight is usually selected in the range of 40 to 120 g / m ² .

The thickness of the substrate sheet is not particularly limited, but is usually selected in the range of 20 to 500 μm, preferably 30 to 300 μm.
Here, "the thickness of the base sheet" means the thickness of the whole base sheet, and for example, the thickness of the base sheet consisting of a plurality of layers is the total of all the layers constituting the base sheet. Means the thickness of. In addition, as a measuring method of the thickness of a base material sheet, thickness is measured using a contact-type thickness meter in arbitrary five places, for example, The method of calculating the average of a measured value etc. is mentioned.

<Pressure-sensitive adhesive layer>
A well-known thing can be suitably used for the said adhesive layer.
The pressure-sensitive adhesive layer can be formed using a pressure-sensitive adhesive composition containing various components for constituting the pressure-sensitive adhesive layer. The ratio of the contents of the components which do not vaporize at normal temperature in the pressure-sensitive adhesive composition is usually the same as the ratio of the contents of the components of the pressure-sensitive adhesive layer. In addition, in this specification, the "normal temperature" means the temperature which does not cool or heat especially, ie, the normal temperature, for example, the temperature of 15-30 degreeC etc. are mentioned.

There is no restriction | limiting in particular as an adhesive composition used for formation of the said adhesive layer, Arbitrary things can be selected suitably from what is conventionally used for the adhesive layer of an adhesive sheet conventionally. For example, acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, polyurethane-based pressure-sensitive adhesives and polyester-based pressure-sensitive adhesives can be used. In addition, it may be any of emulsion type, solvent type or non-solvent type, and may be either cross-linked type or non-cross-linked type.
Acrylic pressure-sensitive adhesives include those obtained by crosslinking a copolymer comprising a monomer imparting adhesiveness, a monomer imparting cohesive force, and a monomer containing a crosslinkable functional group with a crosslinking agent. .
As a monomer which provides adhesiveness, (meth) acrylic-acid alkylesters, such as butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, etc. are mentioned.
Examples of the monomer imparting cohesive force include methyl (meth) acrylate, vinyl acetate, styrene, acrylonitrile and the like.
As a monomer containing a functional group, (meth) acrylic acid, maleic acid, itaconic acid, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, N-methylol (meth) acrylamide etc. are mentioned.
As a crosslinking agent, an isocyanate type crosslinking agent, an epoxy type crosslinking agent, and a metal chelate type crosslinking agent are mentioned.

  The pressure-sensitive adhesive composition may further contain various additives such as a coloring agent (pigment, dye), an anti-deterioration agent, an antistatic agent, a flame retardant, an ultraviolet ray and the like in addition to the components described above.

  The thickness of the pressure-sensitive adhesive layer can be appropriately selected according to the purpose, but is preferably 5 to 100 μm, more preferably 5 to 80 μm, and particularly preferably 5 to 60 μm. Here, "the thickness of the pressure-sensitive adhesive layer" means the thickness of the entire pressure-sensitive adhesive layer, and for example, the thickness of the pressure-sensitive adhesive layer composed of a plurality of layers means the total of all layers constituting the pressure-sensitive adhesive layer. Means the thickness of. In addition, as a measuring method of the thickness of an adhesive layer, thickness is measured using a contact-type thickness meter in arbitrary five places, for example, The method of calculating the average of a measured value etc. is mentioned.

  An adhesive composition is obtained by mix | blending each component for comprising an adhesive layer, such as an acryl-type copolymer.

<< Production method of adhesive sheet with release liner >>
The release liner-attached pressure-sensitive adhesive sheet can be produced by sequentially laminating the above-described layers in a corresponding positional relationship. The method of forming each layer is as described above.

  For example, the above-mentioned pressure-sensitive adhesive composition is coated on the release-treated surface of the release liner, and dried as necessary, thereby laminating the pressure-sensitive adhesive layer on the release-treated surface of the release liner, and peeling off the substrate sheet The pressure-sensitive adhesive layer formed on the release-treated surface of the liner can be bonded to form a release liner-attached pressure-sensitive adhesive sheet. The surface on the release liner side of the pressure-sensitive adhesive layer of the release liner-attached pressure-sensitive adhesive sheet has a surface shape in which the shape of the release-treated surface of the release liner is transferred to the reverse shape.

  In addition, the above-mentioned pressure-sensitive adhesive composition is coated on a substrate sheet, and dried as necessary, whereby the pressure-sensitive adhesive layer is laminated on the substrate sheet, and the release-treated surface of the release liner and the substrate sheet The pressure-sensitive adhesive layer formed in the above may be pasted together to form a pressure-sensitive adhesive sheet with a release liner. Also at this time, the surface on the release liner side of the pressure-sensitive adhesive layer of the release liner-attached pressure-sensitive adhesive sheet has a surface shape in which the shape of the release-treated surface of the release liner is transferred to an inverse shape.

  The pressure-sensitive adhesive composition may be applied to the surface of the release-treated surface of the release liner or the surface of the substrate sheet by a known method, for example, an air knife coater, a blade coater, a bar coater, a gravure coater, a roll coater, a roll The method of using various coaters, such as a knife coater, a curtain coater, a die coater, a knife coater, a screen coater, and a kiss coater, is mentioned.

  If necessary, the applied pressure-sensitive adhesive composition may be crosslinked by heating. The heating conditions may be, for example, 80 to 130 ° C. for 1 to 5 minutes, but not limited thereto.

  Hereinafter, the present invention will be described in more detail by way of examples of a release liner-attached pressure-sensitive adhesive sheet. However, the present invention is not limited at all to the examples shown below.

[Method of measuring maximum height roughness Rz of uneven portion]
According to JIS B0601: 2013, using "SURFTEST SV-3000" manufactured by Mitutoyo Co., Ltd., measure the surface roughness of the concavo-convex part between the stripe-shaped convex parts, and measure the maximum height roughness Rz of the concavo-convex part I asked.

[Air venting (air buildup disappearance) test]
The sample was cut into 50 mm x 50 mm, and the adhesive sheet from which the release liner was peeled off was attached to a melamine-coated plate so that a circular air reservoir with a diameter of 15 mm could be obtained, and the adhesive sheet was crimped with a squeegee and evaluated according to the following criteria. .
○: Air accumulation disappeared.
X: The air pool did not disappear.

[Reposition aptitude test]
The release liner-attached pressure-sensitive adhesive sheet was cut into a width of 50 mm and a length of 100 mm as a test sample. As a base material to which an adhesive sheet is to be attached, a flat melamine-painted surface was cleaned with ethanol. Subsequently, the release liner was peeled off from the pressure-sensitive adhesive sheet with a release liner, and the test sample was placed so that the pressure-sensitive adhesive layer was in contact with the melamine-coated plate. After 10 seconds, with the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet in contact with the melamine-coated plate, the pressure-sensitive adhesive sheet was moved (slide) in the direction along the base material.
○: The adhesive sheet could be moved smoothly in the direction along the base material.
Δ: The adhesive sheet was able to move in the direction along the base material, although it was stuck.
X: The adhesive sheet could not be moved in the direction along the base material.

Example 1
(Production of base sheet)
The composition for base sheet obtained by melting the following base resin was formed into a film of 80 μm in thickness by a calender to obtain a base sheet.

Base resin:
Polyvinyl chloride (PVC): 100 parts by mass, dioctyl phthalate: 20 parts by mass, epoxy plasticizer: 5 parts by mass, barium zinc based stabilizer: 2 parts by mass, titanium oxide (pigment): 10 parts by mass

(Production of pressure-sensitive adhesive composition)
As a monomer component, 92 parts by mass of butyl acrylate and 8 parts by mass of acrylic acid, 200 parts by mass of ethyl acetate as a solvent, and 0.2 parts by mass of azobisisobutyronitrile as a polymerization initiator are put in a reactor Mixed. After degassing with nitrogen gas for 4 hours and gradually raising the temperature to 60 ° C., the polymerization reaction is carried out with stirring for 24 hours, and an ethyl acetate solution containing an acrylic copolymer having a weight average molecular weight of 650,000 (dry mass A concentration of 33% by mass was obtained. The adhesive composition was obtained by adding 1 mass part of isocyanate type crosslinking agents with respect to 100 mass parts of ethyl acetate solutions.

(Production of release liner)
After sandblasting the entire surface of the metal roll, etching is performed on a plurality of stripe-shaped recesses parallel to one another, and the metal roll thus obtained is pressed against the polyethylene surface of the release liner substrate laminated with polyethylene on the paper substrate. By forming a surface of a predetermined shape shown in FIG. 2 on the substrate for release liner, and further applying a release agent made of silicone to a thickness of 0.1 μm, parallel to each other corresponding to the stripe-shaped concave portions of the metal roll The release liner of Example 1 in which a plurality of stripe-shaped convex portions 11 and uneven uneven portions 15 having a height corresponding to the sandblasted surface of the metal roll are provided between the stripe-shaped convex portions 11. Was produced.
In the obtained release liner, the width of the stripe-shaped convex portion is 80 μm, the height of the stripe-shaped convex portion is 20 μm, and the centerline distance between the stripe-shaped convex portions is 600 μm. In the meantime, the maximum height roughness Rz of the uneven part of uneven height was 10.2 μm.

(Production of adhesive sheet with release liner)
The pressure-sensitive adhesive composition is applied to the release liner of Example 1 so that the thickness of the pressure-sensitive adhesive layer after drying is 30 μm, and after being dried at 90 ° C. for 1 minute, transferred to the substrate sheet. A pressure-sensitive adhesive layer was formed, and a release liner-attached pressure-sensitive adhesive sheet of Example 1 was produced. The performance evaluation results of this pressure-sensitive adhesive sheet are shown in Table 1.

Example 2
(Production of release liner)
After etching the entire surface of the metal roll into a conical shape with a predetermined depth, etching is performed on a plurality of stripe-shaped recesses parallel to one another, and the metal roll obtained in this way is used as a substrate for a release liner obtained by laminating polyethylene on a paper substrate. By pressing on the polyethylene surface, a surface of a predetermined shape is formed on the substrate for release liner, and a release agent made of silicone is applied to a thickness of 0.1 μm to cope with the stripe-shaped recess of the metal roll. In the embodiment, a plurality of stripe-shaped convex portions 11 parallel to each other, and a conical uneven portion 15 having a constant height corresponding to the etching-treated surface of the metal roll are provided between the stripe-shaped convex portions 11. The release liner of Example 2 was made.
In the obtained release liner, the width of the stripe-shaped convex portion is 80 μm, the height of the stripe-shaped convex portion is 20 μm, and the centerline distance between the stripe-shaped convex portions is 600 μm. Between them, the maximum height roughness Rz of the conical shaped concavity and convexity at a constant height was 10.0 μm.

(Production of adhesive sheet with release liner)
The pressure-sensitive adhesive composition is applied to the release liner of this example 2 in the same manner as in example 1 so that the thickness of the pressure-sensitive adhesive layer after drying is 30 μm, and after drying at 90 ° C. for 1 minute, It transferred to a material sheet, the adhesive layer was formed, and the adhesive sheet with the release liner of Example 2 was produced. The performance evaluation results of this pressure-sensitive adhesive sheet are shown in Table 1.

Comparative Example 1
The release liner of Comparative Example 1 is provided in the same manner as in Example 1 except that the conditions of the sand blasting treatment on the entire surface of the metal roll are adjusted so that the maximum height roughness Rz of the uneven portion is 1.2 μm. An adhesive sheet was produced. The performance evaluation results of this pressure-sensitive adhesive sheet are shown in Table 1.

Comparative Example 2
The conditions for the etching process of a plurality of stripe-shaped concave portions parallel to each other in the metal roll were adjusted, and the width of the stripe-shaped convex portions was 8 μm and the height of the stripe-shaped convex portions was 5 μm. In the same manner as in No. 1, a release liner-attached pressure-sensitive adhesive sheet of Comparative Example 2 was produced. The performance evaluation results of this pressure-sensitive adhesive sheet are shown in Table 1.

Comparative Example 3
Comparative Example 3 in the same manner as Comparative Example 1 except that the height of the stripe-shaped convex portions was 3 μm by adjusting the conditions for etching the plurality of stripe-shaped concave portions parallel to each other in the metal roll. An adhesive sheet with a release liner was produced. The performance evaluation results of this pressure-sensitive adhesive sheet are shown in Table 1.

  In the release liner-attached pressure-sensitive adhesive sheet of Examples 1 and 2, the width of the stripe-shaped convex portion is 10 to 150 μm, the height of the stripe-shaped convex portion is 5 to 40 μm, and the centers of the stripe-shaped convex portions are provided. A line interval is 200 to 1000 μm, and a concavo-convex portion is provided between the stripe-shaped convex portions, and a maximum height roughness Rz of the concavo-convex portion is larger than 3 μm and the stripe-shaped convex portion As it was smaller than the height, it was excellent in air leakage at the time of construction and also good in repositioning aptitude. In the release liner-attached pressure-sensitive adhesive sheet of Comparative Example 1, the height of the stripe-shaped convex portion is 5 μm or more, so the air release property is good, but the maximum height Rz of the uneven portion is 3 μm or less, so repositioning aptitude Was bad. In the release liner-attached pressure-sensitive adhesive sheet of Comparative Example 2, the maximum height roughness Rz of the concavo-convex part is 3 μm or less, the width of the stripe-like convex part is less than 10 μm, and the air leakage property is also poor. It was bad. In the release liner-attached pressure-sensitive adhesive sheet of Comparative Example 3, the maximum height roughness Rz of the concavo-convex portion is 3 μm or less, the height of the stripe convex portion is less than 5 μm, and the air leakage property is also poor. Was also bad.

  The adhesive sheet with release liner of the present invention is excellent in air release property at the time of construction, and excellent in repositioning aptitude. Therefore, advertising labels, decorative labels, and displays for outer walls, inner walls, and window glass of buses, trains, cars, aircrafts, etc. It can be suitably used as a label or the like.

  1 ... adhesive sheet with release liner, 10 ... release liner, 20 ... adhesive layer, 30 ... base sheet, 40 ... adhesive sheet, 50 ... adherend, 11 · · · Striped convex portion, 12 · · · Width of the striped convex portion, 13 · · · Height of the striped convex portion, · · · · · · · · · · · · · · · · · · · · center portion spacing between the stripe-shaped convex portion 22: Striped concave portion 24: Transfer surface having irregularities

Claims (3)

A pressure-sensitive adhesive sheet with a release liner comprising a release liner, a pressure-sensitive adhesive layer and a substrate sheet laminated in this order,
The release liner has a plurality of stripe-shaped convex portions parallel to each other on the release-treated surface in contact with the pressure-sensitive adhesive layer,
The width of the striped convex portion is 10 to 150 μm, and the height of the striped convex portion is 5 to 40 μm,
The centerline distance between the stripe-shaped convex portions is 200 to 1000 μm,
A pressure-sensitive adhesive sheet with a release liner is provided between the stripe-shaped protrusions, and the maximum height roughness Rz of the protrusions is larger than 3 μm and smaller than the height of the stripe-shaped protrusions. .   The pressure-sensitive adhesive sheet with a release liner according to claim 1, wherein the heights of the uneven portions are irregular. It has a plurality of stripe-shaped convex parts parallel to each other on the peeling treated surface,
The width of the striped convex portion is 10 to 150 μm, and the height of the striped convex portion is 5 to 40 μm,
The centerline distance between the stripe-shaped convex portions is 200 to 1000 μm,
A release liner, wherein a concavo-convex portion is provided between the stripe-shaped convex portions, and the maximum height roughness Rz of the concavo-convex portion is larger than 3 μm and smaller than the height of the stripe-shaped convex portion.

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