JP2023057091A - Method for manufacturing release liner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a release liner which is usable in an adhesive sheet with a release liner that is excellent in air removability during construction, and is excellent in positioning suitability.

SOLUTION: There is provided a method for manufacturing a release liner 10, wherein the release liner 10 has a plurality of striped projections 11 in parallel with each other on a release treatment surface, widths 12 of the striped projections 11 are 10-150 μm, heights 13 of the striped projections 11 are 5-40 μm, center line intervals 14 between the striped projections 11 are 200-1,000 μm, uneven parts 15 are provided between the striped projections 11, the maximum height roughness Rz of the uneven parts 15 is larger than 3 μm and is smaller than the heights 13 of the striped projections 11, and the heights of the uneven parts 15 are irregular.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a method for producing a release liner that can be used for a pressure-sensitive adhesive sheet with a release liner.

A pressure-sensitive adhesive sheet with a release liner, which is obtained by laminating a release liner on a base sheet with a pressure-sensitive adhesive layer interposed therebetween, is used for purposes such as decoration and display. Such a decorative or display adhesive sheet can be applied simply by peeling off the release liner and sticking the adhesive layer to the adherend. Therefore, it has become widely used in place of the conventional painting method for decoration or display. there is

When the pressure-sensitive adhesive sheet has a large area, air pockets tend to occur between the pressure-sensitive adhesive layer and the adherend at the time of application, which sometimes impairs the appearance of the pressure-sensitive adhesive sheet. A technique is also known in which air can be communicated between the pressure-sensitive adhesive layer and the adherend by providing uneven portions on the surface of the release liner (Patent Documents 1 and 2).

JP-A-07-224254 JP-A-07-278508

These pressure-sensitive adhesive sheets with a release liner are expected to have high adhesive strength because the surface of the pressure-sensitive adhesive layer is provided with irregularities that allow air to pass through. is difficult, and repositioning becomes difficult.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a PSA sheet with a release liner that is excellent in air release properties during application and excellent repositionability, and a release liner that can be used therefor.

In order to solve the above problems, the inventors of the present invention conducted extensive studies and found that a release liner-attached pressure-sensitive adhesive sheet comprising a release liner, a pressure-sensitive adhesive layer and a base sheet laminated in this order, wherein the release liner comprises: The object is achieved by providing a plurality of mutually parallel stripe-shaped projections of a predetermined size on the release-treated surface, and providing irregularities of a predetermined size between the stripe-shaped projections. I found what I can do.

That is, the present invention provides the following method for producing a release liner.
[1] A method for manufacturing a release liner, comprising:
The release liner has a plurality of stripe-shaped projections parallel to each other on the release-treated surface,
The width of the stripe-shaped convex portion is 10 to 150 μm, and the height of the stripe-shaped convex portion is 5 to 40 μm,
a center line interval between the stripe-shaped convex portions is 200 to 1000 μm,
An uneven portion is provided between the stripe-shaped convex portions, and the maximum height roughness Rz of the uneven portion is larger than 3 μm and smaller than the height of the stripe-shaped convex portion,
The heights of the uneven portions are uneven,
the stripe-shaped protrusions are parallel to each other only, or have a lattice shape, a parallelogram shape, a rhombus shape, or a triangular shape;
After sandblasting the entire surface of the metal roll, a plurality of mutually parallel striped recesses are formed, and the metal roll thus obtained is pressed against the release liner base material to form a predetermined shape on the release liner base material. Furthermore, by applying a release agent, the plurality of mutually parallel striped protrusions corresponding to the striped recesses of the metal roll, and between the striped protrusions, the sandblasted surface of the metal roll A method for manufacturing a release liner, wherein the irregularities of corresponding heights are provided.

[2] The method for producing a release liner according to [1], wherein after sandblasting the entire surface of the metal roll, a plurality of mutually parallel striped recesses are formed by etching.

According to the pressure-sensitive adhesive sheet with a release liner of the present invention, there is provided a pressure-sensitive adhesive sheet that has excellent air release properties during application and excellent repositionability, and a release liner that can be used therefor.

BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional schematic diagram which shows one Embodiment of the adhesive sheet with a release liner of this invention. 1 is a schematic perspective view showing a release liner of the pressure-sensitive adhesive sheet with a release liner according to one embodiment of the present invention. FIG. 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 pressure-sensitive adhesive sheet with a release liner of the present invention will be described with reference to the drawings. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, there are cases where the main parts are enlarged for convenience, and the dimensional ratios of each component are the same as the actual ones. not necessarily.

FIG. 1 is a cross-sectional view schematically showing one embodiment of the pressure-sensitive adhesive sheet with a release liner of the present invention. FIG. 2 is a schematic perspective view showing a release liner of this pressure-sensitive adhesive sheet with a release liner.
The release liner-equipped pressure-sensitive adhesive sheet 1 shown here comprises a release liner 10, a pressure-sensitive adhesive layer 20, and a base sheet 30 laminated in this order. a plurality of stripe-shaped projections 11, the width 12 of the stripe-shaped projections 11 is 10 to 150 μm, the height 13 of the stripe-shaped projections 11 is 5 to 40 μm, and the distance between the stripe-shaped projections 11 The center line interval 14 is 200 to 1000 μm, the uneven portion 15 is provided between the stripe-shaped convex portions 11, the maximum height roughness Rz of the uneven portion 15 is larger than 3 μm, and the stripe-shaped convex portion 11 is smaller than the height 13.

FIG. 3 is a schematic cross-sectional view showing an example of how to use the adhesive sheet. When using the pressure-sensitive adhesive sheet 1 with a release liner, the release liner 10 is peeled off, and the pressure-sensitive adhesive layer 20 side of the remaining pressure-sensitive adhesive sheet 40 is brought into contact with the adherend 50 . Since the release liner 10 has a plurality of mutually parallel striped protrusions 11 on the release-treated surface in contact with the pressure-sensitive adhesive layer 20, the surface of the pressure-sensitive adhesive layer 20 bonded to the surface of the release liner 10 has A plurality of stripe-shaped recesses 22 are formed parallel to each other, and since there are these stripe-shaped recesses 22, air can be easily removed by applying pressure with a squeegee, fingers, or the like during construction. Since there is no occurrence of air pockets, the adhesive can be easily applied neatly with good adhesion. In addition, since the release liner 10 is provided with the uneven portions 15 between the stripe-shaped convex portions 11, the transfer surface 24 having the unevenness of the adhesive layer 20 corresponding to the uneven portions 15 is formed during application. It becomes the initial contact surface with the 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 base sheet 30, or the surface of the base sheet 30 is exposed, and the appearance is not spoiled.

Each layer constituting the pressure-sensitive adhesive sheet with a release liner of the present invention will be described below.

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

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

The center line spacing between the stripe-shaped protrusions is 200 to 1000 μm, preferably 300 to 900 μm, more preferably 400 to 800 μm.

Since the release liner has a plurality of stripe-shaped projections parallel to each other and having the above sizes, the surface of the pressure-sensitive adhesive layer provided on the surface of the release liner has a plurality of such sizes. stripe-shaped recesses are formed, and air can be easily removed during construction. It is preferable that the plurality of striped protrusions are formed continuously up to the edge of the base sheet. The shape of the plurality of stripe-shaped projections of the release liner is not particularly limited as long as it forms a plurality of stripe-shaped recesses on the surface of the pressure-sensitive adhesive layer and allows air to be easily released during application. The cross section of the plurality of striped projections of the release liner may be approximately square, approximately rectangular, approximately triangular, approximately semicircular, or approximately semielliptical. may be

Moreover, it is preferable that the plurality of striped protrusions of the release liner are parallel and regularly spaced at equal intervals. To make a plurality of striped recesses on the surface of an adhesive layer inconspicuous after sticking even when a substrate sheet is transparent or translucent by arranging the plurality of striped projections in parallel and regularly at equal intervals. can be done.

The plurality of stripe-shaped protrusions 11 of the release liner 10 need only be parallel to each other. For example, as shown in FIG. And it may be a grid shape having parts that intersect at right angles to each other, parallelograms or rhombuses having parts that are parallel to each other and parts that intersect with each other at a predetermined angle It may be triangular with some meeting at an angle.

The release liner is provided with uneven portions between the stripe-shaped convex portions.
The maximum height roughness Rz of the irregularities is greater than 3 μm, preferably greater than 5 μm, and more preferably greater than 7 μm. Further, the maximum height roughness Rz of the irregularities is smaller than the height of the stripe-shaped projections, and preferably smaller than 80% of the height of the stripe-shaped projections. More preferably less than 70%.

The release liner has the stripe-shaped projections, and an uneven portion is provided between the stripe-shaped projections. Since the layer is point-bonded to the adherend, it can have excellent air release properties and excellent repositioning suitability.

It is preferable that the heights of the uneven portions of the release liner are uneven. Since the heights of the uneven portions are uneven, the aptitude for repositioning can be made more excellent.

As the release liner, a release liner substrate having at least one surface subjected to a release treatment is used. The substrate for the release liner is not particularly limited. For example, laminated paper obtained by laminating a thermoplastic resin such as polyethylene onto a paper substrate such as fine paper, glassine paper, or coated paper, or polyethylene terephthalate, polybutylene terephthalate, or polyethylene. Examples include polyester films such as naphthalate, and plastic films such as polyolefin films such as polypropylene and polyethylene. Furthermore, a laminated film obtained by laminating these films may be used.

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

In order to release the surface of a film or the like that is to be the base material for a release liner using the above-mentioned release agent, the release agent can be used as it is without a solvent, diluted with a solvent, or emulsified, and then applied using a gravure coater, bar coater, or air knife coater. A release agent layer may be formed by coating the release agent with a roll coater or the like and subjecting the release liner coated with the release agent to room temperature or heating, or by curing with an electron beam. Although the thickness of the release agent layer is not particularly limited, it is about 0.05 to 5 μm.

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

(Manufacturing method of release liner)
The release liner is produced by forming a predetermined shape on a release liner base material by a conventionally known method using an embossing roll or the like, and applying a release agent such as silicone to provide a release treated surface.
For example, after the entire surface of the metal roll is sandblasted, a plurality of mutually parallel stripe-shaped recesses are etched, and the metal roll thus obtained is pressed against the release liner base material to give the release liner base material a predetermined shape. is formed, and a release agent is applied to form a plurality of mutually parallel striped protrusions 11 corresponding to the striped recesses of the metal roll, and sandblasting of the metal roll between the striped protrusions 11 The release liner 10 can be prepared with irregularities 15 having uneven heights corresponding to the treated surface.
Alternatively, after the entire surface of the metal roll is etched into a conical shape with a certain depth, a plurality of mutually parallel striped recesses are etched, and the metal roll thus obtained is pressed against the base material for a release liner to form a release liner. By forming a predetermined shape on the base material for printing and applying a release agent, a plurality of parallel stripe-shaped protrusions 11 corresponding to the stripe-shaped recesses of the metal roll and the stripe-shaped protrusions 11 between each other are formed. A release liner 10 can be produced in which irregularities 15 having regular heights corresponding to the cone-shaped etched surface of the metal roll are provided therebetween.

<Base material sheet>
The base sheet used for the pressure-sensitive adhesive sheet of the present invention is not particularly limited, and various plastic sheets and papers that are commonly used as base sheets such as pressure-sensitive adhesive sheets having conventional pressure-sensitive adhesive layers can be used. A decorative layer such as printing, printing, vapor deposition, sputtering, etc., or a functional layer such as a hard coat, an anti-contamination coat, or a glossiness adjustment coat may be formed on the surface of the above material.

Examples of the 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; -based resin, polycarbonate-based resin, polyamide-based resin, polyurethane-based resin, fluorine-based resin such as polytetrafluoroethylene, polybutene, polybutadiene, polymethylpentene, ethylene-vinyl acetate copolymer, ethylene (meth)acrylic acid copolymer, Ethylene (meth)acrylate copolymers, ABS resins, ionomer resins; thermoplastic elastomers containing components such as polyolefins, polyurethanes, polystyrenes, polyvinyl chlorides, polyesters, and sheets made of mixtures or laminates of these resins. be able to.

In addition, these plastic sheets may optionally be subjected to corona treatment or primer treatment in order to improve the adhesion to layers such as an adhesive layer, a printing layer, and an ink-receiving layer provided thereon.
As the paper, woodfree paper, art paper, coated paper, kraft paper and the like are used. When paper is used for the base sheet, the basis weight is usually selected in the range of 40 to 120 g/m ² .

The thickness of the base sheet is not particularly limited, but is usually selected in the range of 20-500 μm, preferably 30-300 μm.
Here, the "thickness of the base sheet" means the thickness of the entire base sheet. means the thickness of As a method for measuring the thickness of the base sheet, for example, a method of measuring the thickness at arbitrary five points using a contact-type thickness gauge and calculating the average of the measured values can be used.

<Adhesive layer>
A known pressure-sensitive adhesive layer can be appropriately used.
The pressure-sensitive adhesive layer can be formed using a pressure-sensitive adhesive composition containing various components for constituting this layer. The content ratio of the components that do not vaporize at room temperature in the pressure-sensitive adhesive composition is usually the same as the content ratio of the components in the pressure-sensitive adhesive layer. In this specification, the term "ordinary temperature" means a temperature at which no particular cooling or heating is applied, that is, a normal temperature.

The pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer is not particularly limited, and any composition commonly used for the pressure-sensitive adhesive layer of conventional pressure-sensitive adhesive sheets can be appropriately selected and used. For example, acrylic adhesives, rubber adhesives, silicone adhesives, polyurethane adhesives, polyester adhesives, and the like can be used. Further, it may be an emulsion type, a solvent type or a non-solvent type, and may be either a cross-linked type or a non-cross-linked type.
Acrylic pressure-sensitive adhesives include those obtained by cross-linking a copolymer consisting of a monomer that imparts adhesiveness, a monomer that imparts cohesive force, and a monomer containing a cross-linkable functional group with a cross-linking agent. .
Examples of monomers that impart adhesiveness include (meth)acrylic acid alkyl esters such as butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and octyl (meth)acrylate.
Monomers that impart cohesion include methyl (meth)acrylate, vinyl acetate, styrene, acrylonitrile, and the like.
Functional group-containing monomers include (meth)acrylic acid, maleic acid, itaconic acid, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, N-methylol(meth)acrylamide and the like can be mentioned.
Examples of cross-linking agents include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, and metal chelate-based cross-linking agents.

The pressure-sensitive adhesive composition may further contain various additives such as colorants (pigments, dyes), anti-deterioration agents, anti-static agents, flame retardants, ultraviolet rays, etc., in addition to the above components.

The thickness of the pressure-sensitive adhesive layer can be appropriately selected depending on the purpose, but is preferably 5 to 100 μm, more preferably 5 to 80 μm, 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. means the thickness of As a method for measuring the thickness of the pressure-sensitive adhesive layer, for example, a method of measuring the thickness at arbitrary five points using a contact-type thickness meter and calculating the average of the measured values can be used.

The pressure-sensitive adhesive composition is obtained by blending each component for constituting the pressure-sensitive adhesive layer, such as an acrylic copolymer.

<<Method for producing pressure-sensitive adhesive sheet with release liner>>
The pressure-sensitive adhesive sheet with a release liner can be produced by sequentially laminating the layers described above so as to have a corresponding positional relationship. The method for forming each layer is as described above.

For example, by coating the above-described PSA composition on the release-treated surface of the release liner and drying it as necessary, the PSA layer is laminated on the release-treated surface of the release liner, and the substrate sheet and the release are separated. A PSA sheet with a release liner can be obtained by laminating the PSA layer formed on the release-treated surface of the liner. The release liner side surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet with a release liner has a surface shape in which the shape of the release-treated surface of the release liner is reversely transferred.

In addition, by coating the above-mentioned adhesive composition on the base sheet and drying it as necessary, the adhesive layer is laminated on the base sheet, and the release treated surface of the release liner and the base sheet are coated. The pressure-sensitive adhesive layer formed in the above can be laminated to form a pressure-sensitive adhesive sheet with a release liner. Also in this case, the surface of the release liner side of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet with a release liner has a surface shape in which the shape of the release-treated surface of the release liner is reversely transferred.

Application of the pressure-sensitive adhesive composition to the release-treated surface of the release liner or the surface of the base sheet may be performed by a known method, such as an air knife coater, blade coater, bar coater, gravure coater, roll coater, and roll coater. A method using various coaters such as a knife coater, curtain coater, die coater, knife coater, screen coater and kiss coater can be used.

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

The present invention will be described in more detail below with reference to examples of pressure-sensitive adhesive sheets with a release liner. However, the present invention is by no means limited to the examples shown below.

[Measurement method of maximum height roughness Rz of uneven part]
In accordance with JIS B0601: 2013, using "SURFTEST SV-3000" manufactured by Mitutoyo Co., Ltd., the surface roughness of the uneven portion between the stripe-shaped convex portions is measured, and the maximum height roughness Rz of the uneven portion is measured. asked.

[Air release property (air retention loss property) test]
A sample was cut to 50 mm x 50 mm, the adhesive sheet with the release liner removed was attached to a melamine-coated plate so as to form a circular air pocket with a diameter of 15 mm, and the adhesive sheet was pressed with a squeegee and evaluated according to the following criteria. .
◯: Air pockets disappeared.
x: Air pockets did not disappear.

[Repositioning aptitude test]
A pressure-sensitive adhesive sheet with a release liner was cut to a width of 50 mm and a length of 100 mm to obtain a test specimen. A flat melamine-coated plate whose surface was wiped with ethanol was prepared as a base material to which the adhesive sheet was attached. Subsequently, the release liner was peeled off from the adhesive sheet with the release liner, and the test sample was placed so that the adhesive layer was in contact with the melamine-coated plate. After 10 seconds, the pressure-sensitive adhesive sheet was moved (slid) in a direction along the substrate while the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet and the melamine-coated plate were kept in contact with each other.
◯: The adhesive sheet could be moved smoothly in the direction along the base material.
Δ: The adhesive sheet could be moved in the direction along the base material, although it was caught.
x: The adhesive sheet could not be moved in the direction along the base material.

[Example 1]
(Manufacture of base sheet)
A base sheet was obtained by forming a film with a thickness of 80 μm using a calender from a base sheet composition obtained by melting the following base resin.

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

(Production of adhesive composition)
92 parts by mass of butyl acrylate and 8 parts by mass of acrylic acid as monomer components, 200 parts by mass of ethyl acetate as a solvent, and 0.2 parts by mass of azobisisobutyronitrile as a polymerization initiator were placed 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. concentration of 33% by mass). An adhesive composition was obtained by adding 1 part by mass of an isocyanate-based cross-linking agent to 100 parts by mass of the ethyl acetate solution.

(Manufacture of release liner)
After the entire surface of the metal roll is sandblasted, a plurality of mutually parallel striped recesses are etched, and the metal roll obtained in this way is pressed against the polyethylene surface of a release liner base material in which polyethylene is laminated to a paper base material. 2 was formed on the substrate for release liner, and a release agent made of silicone was applied to a thickness of 0.1 μm. The release liner of Example 1 is provided with a plurality of stripe-shaped projections 11, and between the stripe-shaped projections 11, irregularities 15 having uneven heights corresponding to the sandblasted surface of the metal roll. was made.
In the release liner thus obtained, the width of the stripe-shaped projections was 80 μm, the height of the stripe-shaped projections was 20 μm, the centerline interval between the stripe-shaped projections was 600 μm, and the distance between the stripe-shaped projections was 600 μm. The maximum height roughness Rz of uneven heights between the two was 10.2 μm.

(Manufacturing of adhesive sheet with release liner)
The adhesive composition was applied to the release liner of Example 1 so that the thickness of the adhesive layer after drying was 30 μm, dried at 90° C. for 1 minute, and then transferred to the base sheet. A pressure-sensitive adhesive layer was formed to prepare a pressure-sensitive adhesive sheet with a release liner of Example 1. Table 1 shows the performance evaluation results of this pressure-sensitive adhesive sheet.

[Example 2] (reference example)
(Manufacture of release liner)
After the entire surface of the metal roll is etched into a conical shape with a certain depth, a plurality of mutually parallel striped concave portions are etched, and the metal roll thus obtained is used as a base material for a release liner in which polyethylene is laminated to a paper base material. By pressing against the polyethylene surface, the surface of the release liner substrate is formed in a predetermined shape, and a silicone release agent is applied to a thickness of 0.1 μm to conform to the striped recesses of the metal roll. A plurality of stripe-shaped projections 11 parallel to each other, and between the stripe-shaped projections 11, conical projections 15 with a constant height corresponding to the etching processing surface of the metal roll are provided. A release liner of Example 2 was made.
In the release liner thus obtained, the width of the stripe-shaped projections was 80 μm, the height of the stripe-shaped projections was 20 μm, the centerline interval between the stripe-shaped projections was 600 μm, and the distance between the stripe-shaped projections was 600 μm. The maximum height roughness Rz of the conical concave-convex portion with a constant height between them was 10.0 μm.

(Manufacturing of adhesive sheet with release liner)
In the same manner as in Example 1, the adhesive composition was applied to the release liner of Example 2 so that the thickness of the adhesive layer after drying was 30 μm, and dried at 90° C. for 1 minute. A pressure-sensitive adhesive layer was formed by transferring onto a material sheet, and a pressure-sensitive adhesive sheet with a release liner of Example 2 was produced. Table 1 shows the performance evaluation results of this pressure-sensitive adhesive sheet.

[Comparative Example 1]
With the release liner of Comparative Example 1, in the same manner as in Example 1, except that the conditions for sandblasting the entire surface of the metal roll were adjusted so that the maximum height roughness Rz of the uneven portion was 1.2 μm. An adhesive sheet was produced. Table 1 shows the performance evaluation results of this pressure-sensitive adhesive sheet.

[Comparative Example 2]
Comparative Example except that the conditions for etching a plurality of stripe-shaped depressions parallel to each other on the metal roll were adjusted so that the width of the stripe-shaped projections was 8 μm and the height of the stripe-shaped projections was 5 μm. A pressure-sensitive adhesive sheet with a release liner of Comparative Example 2 was prepared in the same manner as in Example 1. Table 1 shows the performance evaluation results of this pressure-sensitive adhesive sheet.

[Comparative Example 3]
Comparative Example 3 was carried out in the same manner as in Comparative Example 1, except that the conditions for the etching treatment of the plurality of stripe-shaped concave portions parallel to each other on the metal roll were adjusted so that the height of the stripe-shaped convex portions was 3 μm. A pressure-sensitive adhesive sheet with a release liner was produced. Table 1 shows the performance evaluation results of this pressure-sensitive adhesive sheet.

In the pressure-sensitive adhesive sheets with release liners of Examples 1 and 2, the width of the stripe-shaped projections is 10 to 150 μm, the height of the stripe-shaped projections is 5 to 40 μm, and the centers of the stripe-shaped projections The line spacing is 200 to 1000 μm, uneven portions are provided between the stripe-shaped convex portions, the maximum height roughness Rz of the uneven portions is larger than 3 μm, and the stripe-shaped convex portions Since it was smaller than the height, it was excellent in air release property during construction, and was also good in repositioning suitability. In the pressure-sensitive adhesive sheet with a release liner of Comparative Example 1, since the height of the stripe-shaped protrusions was 5 μm or more, the air release property was good. was poor. In the pressure-sensitive adhesive sheet with a release liner of Comparative Example 2, the maximum height roughness Rz of the irregularities was 3 μm or less, the width of the stripe-shaped projections was less than 10 μm, the air release property was poor, and the repositioning suitability was good. was bad. In the pressure-sensitive adhesive sheet with a release liner of Comparative Example 3, the maximum height roughness Rz of the irregularities was 3 μm or less, the height of the stripe-shaped projections was less than 5 μm, the air release property was poor, and the repositionability was good. was also poor.

Since the pressure-sensitive adhesive sheet with a release liner of the present invention has excellent air release properties during application and excellent repositionability, it can be used as advertising labels, decorative labels, and displays on the outer walls, inner walls, and window glass of buses, trains, passenger cars, aircraft, etc. It can be suitably used as a label or the like.

DESCRIPTION OF SYMBOLS 1... PSA sheet with release liner 10... Release liner 20... PSA layer 30... Base material sheet 40... PSA sheet 50... Adherend 11. Stripe-shaped projections 12 Width of stripe-shaped projections 13 Height of stripe-shaped projections 14 Distance between center lines of stripe-shaped projections 15 Unevenness , 22 . . . stripe-shaped concave portions, 24 .

Claims (2)

A method for manufacturing a release liner, comprising:
The release liner has a plurality of stripe-shaped projections parallel to each other on the release-treated surface,
The width of the stripe-shaped convex portion is 10 to 150 μm, and the height of the stripe-shaped convex portion is 5 to 40 μm,
a center line interval between the stripe-shaped convex portions is 200 to 1000 μm,
An uneven portion is provided between the stripe-shaped convex portions, and the maximum height roughness Rz of the uneven portion is larger than 3 μm and smaller than the height of the stripe-shaped convex portion,
The heights of the uneven portions are uneven,
the stripe-shaped protrusions are parallel to each other only, or have a lattice shape, a parallelogram shape, a rhombus shape, or a triangular shape;
After sandblasting the entire surface of the metal roll, a plurality of mutually parallel striped recesses are formed, and the metal roll thus obtained is pressed against the release liner base material to form a predetermined shape on the release liner base material. Furthermore, by applying a release agent, the plurality of mutually parallel striped protrusions corresponding to the striped recesses of the metal roll, and the sandblasted surface of the metal roll between the striped protrusions A method for manufacturing a release liner, wherein the irregularities of corresponding heights are provided. 2. The method for producing a release liner according to claim 1, wherein after sandblasting the entire surface of the metal roll, a plurality of mutually parallel striped recesses are formed by etching.

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