JP2022155278A - Adhesive sheet with winding core and method for manufacturing adhesive sheet with winding core - Google Patents

Abstract

To provide an adhesive sheet having no release paper, in other words, an adhesive sheet with a winding core, and a method for manufacturing an adhesive sheet with a winding core.SOLUTION: An adhesive sheet with a winding core is formed by winding around and laminating an adhesive sheet on a winding core having a winding core release layer thereon, wherein the adhesive sheet is formed by laminating an adhesive layer, a base material layer and a design layer in this order, the winding core release layer and the adhesive layer are brought into contact with each other, and the design layer and the adhesive layer are brought into contact with each other by laminating the adhesive sheet.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a cored pressure-sensitive adhesive sheet and a method for manufacturing the cored pressure-sensitive adhesive sheet.

Vinyl chloride or olefin wallpaper is used for walls and ceilings in general house interiors. These wallpapers are generally glued on the back side using a gluing machine on-site by craftsmen, and then pasted after curing for a certain period of time. There is
In order to solve the above problems, wallpaper with an adhesive layer, which is provided with an adhesive layer in advance, has been distributed (Patent Document 1).

Utility model registration No. 3104480

However, wallpaper with an adhesive layer, such as that disclosed in Patent Document 1, is provided with release paper in order to protect the adhesive layer before installation. Therefore, it is necessary to remove the release paper at the time of construction. There is a problem that it is not environmentally friendly.

In view of the above, an object of the present disclosure is to provide a pressure-sensitive adhesive sheet having no release liner, that is, a pressure-sensitive adhesive sheet with a core, and a method for producing the pressure-sensitive adhesive sheet with a core.

The core-attached adhesive sheet of the present disclosure is a core-attached adhesive sheet in which the adhesive sheet is wound and laminated around the core having a core release layer on the surface, and the adhesive sheet includes an adhesive layer, a base layer, The design layer is laminated in this order, the core release layer and the adhesive layer are in contact, and the design layer and the adhesive layer are in contact by laminating the adhesive sheet. .

In the pressure-sensitive adhesive sheet with a winding core, the pressure-sensitive adhesive layer may have a plurality of concave shapes on both sides thereof.

In the pressure-sensitive adhesive sheet with a winding core, the concave shapes may be formed evenly on both sides of the pressure-sensitive adhesive layer.

In the pressure-sensitive adhesive sheet with a winding core, the average value of the diameters of the concave openings on the side of the substrate layer is defined as ^Dave ₁ , and the concave openings on the side opposite to the substrate layer are averaged. When the average diameter of the openings is D ^ave ₂ ,
_| ^Dave1 ₋ ^{Dave2 |} _/Dave2≦0.5
may satisfy the relationship of

In the pressure-sensitive adhesive sheet with a winding core, the design layer may include at least one of a design resin layer and a surface protective layer.

The method for producing a pressure-sensitive adhesive sheet with a core according to the present disclosure includes the steps of preparing a core having a release layer on the surface thereof, preparing a release base sheet, and removing air bubbles from the release base sheet. a step of applying a composition containing bubbles, a step of heating and drying the bubble-containing composition to form an adhesive layer, and a step of bonding the adhesive layer formed on the material sheet to form an adhesive sheet having a releasable base sheet; and winding the adhesive sheet around a core.

According to the present disclosure, it is possible to provide a pressure-sensitive adhesive sheet having no release liner, that is, a core-attached pressure-sensitive adhesive sheet, and a method for manufacturing the core-attached pressure-sensitive adhesive sheet.

(a) schematic perspective view of adhesive sheet with core according to first embodiment, (b) cross-sectional view schematically showing a part of the cross section Schematic cross-sectional view showing the layer structure of the pressure-sensitive adhesive sheet with a core according to the first embodiment. Schematic cross-sectional view showing the layer structure of the pressure-sensitive adhesive sheet with a core according to the second embodiment. Schematic perspective cross-sectional view of a pressure-sensitive adhesive sheet with a core according to a second embodiment A diagram showing a manufacturing apparatus related to a method for manufacturing a pressure-sensitive adhesive sheet with a roll core. Schematic cross-sectional view showing a layered state during production according to the method for producing a pressure-sensitive adhesive sheet with a winding core

[Adhesive sheet with core]
(First embodiment)
A first embodiment of the pressure-sensitive adhesive sheet with a core according to the present disclosure will be described below with reference to FIG. Each figure shown below is a schematic illustration, and the size, shape, decoration, etc. of each part are appropriately exaggerated or simplified for easy understanding. Configurations that are not directly related to the description are omitted as appropriate. In addition, in each figure below, the same reference numerals are assigned to the same parts, and some detailed explanations may be omitted.

Also, in the following description, specific numerical values, shapes, materials, and the like are shown and described, but these can be changed as appropriate.
In this specification, terms such as plate, sheet, and film are used, and as a general usage, they are used in the order of thickness, plate, sheet, and film. I use it in my book as well. However, such proper use has no technical meaning, so even if these words are appropriately replaced, the essence of the present disclosure and the interpretation of the scope of claims remain unchanged. In the present disclosure, the term "sheet" is used in a broad sense to include so-called plates, sheets, and thick forms commonly referred to as films.
In addition, although the terms "front" and "back" are used in this specification, there is no technical meaning to distinguish between the front and back. . In the adhesive sheet with a core in this specification, the surface on the side that is normally observed when the adhesive sheet is used is described as the front surface and the back surface on the opposite side.

FIG. 1(a) shows a schematic perspective view of a pressure-sensitive adhesive sheet 1 with a core according to the first embodiment of the present disclosure. FIG. 1(b) shows a cross-section of the core-equipped adhesive sheet 1 in which the adhesive sheet 2 is wound two times around the core 20 when cut perpendicularly to the axis of the core 20. It is sectional drawing showing a one part outline.
The core-attached adhesive sheet 1 is obtained by winding the adhesive sheet 2 around a core 20 having a release layer 21 on the surface thereof. The adhesive sheet 2 has an adhesive layer 13, a substrate layer 11, and a design layer 10 laminated in this order. The core release layer 21 on the surface of the core 20 and the adhesive layer 13 of the adhesive sheet 2 are in contact with each other. in contact. Further arbitrary layers may be provided at arbitrary positions between the respective layers as long as the order of lamination is not disturbed and the effects of the present disclosure are not significantly impaired.
For example, a foamed resin layer 14 may be provided between the base material layer 11 and the design layer 10 . Also, a primer layer may be provided between the adhesive layer 13 and the base material layer 11 .

The winding core 20 is generally cylindrical and may be solid or hollow. Also, it does not have to be strictly cylindrical. In FIGS. 1(a) and 1(b), a hollow cylinder is used. In FIG. 1B, which is a partial cross-sectional view showing a schematic layer structure, the core 20, the core release layer 21, the adhesive layer 13, the substrate layer 11, the design layer 10, and the adhesive layer 13 are arranged in this order from the inside of the cylinder. , a base material layer 11 and a design layer 10 . Since the adhesive layer 13, the base layer 11, and the design layer 10 are the adhesive sheet 2, the layer structure may also be expressed as the winding core 20, the winding core release layer 21, the adhesive sheet 2, and the adhesive sheet 2. That is, FIG. 1(b) shows the core-attached pressure-sensitive adhesive sheet 1 in which the pressure-sensitive adhesive sheet 2 is wound twice around the core 20 having the release layer 21 on the surface.

As shown in FIG. 1(a), the adhesive sheet 2 can be unwound from such an adhesive sheet 1 with a winding core. The unwound adhesive sheet 2 exposes the design layer 10 on one side and the adhesive layer 13 on the other side.
Among the above layers of the pressure-sensitive adhesive sheet 1 with a winding core, the design layer 10 is composed of various layers as described below. The layer structure of the design layer 10 will be described below.

The design layer 10 according to the first embodiment includes a surface protective layer 18 and at least one of a patterned pattern layer 17 and a solid patterned layer 16 . Then, regardless of the form of the design layer 10, the surface protective layer 18 is the outermost surface of the design layer 10 (the surface of the design layer 10 of the pressure-sensitive adhesive sheet 2 opposite to the substrate layer 11 side). is laminated to That is, the surface protective layer 18 is exposed on the outermost surface of the adhesive sheet 2 .

Hereinafter, the layer structure of the design layer 10 according to the first embodiment will be specifically described.
When the design layer 10 includes the surface protective layer 18 and the patterned pattern layer 17, the patterned pattern layer 17 and the surface protective layer 18 are laminated in this order from the side closer to the base material layer 11 (design layer form 1). Schematic cross-sectional views of the design layer form 1 are shown in FIGS. 1(c) and 2(a). In the design layer form 1, the pattern picture layer 17 is printed in multiple colors, or partially formed (printed) even in a single color, so that the pattern is visually recognized by the human eye. A wood grain pattern is an example of the pattern associated with the pattern layer 17 .

In order to facilitate understanding, in the schematic cross-sectional views from FIG. 1(c), and the layered state is also illustrated by an example in which the adhesive sheet 2 is wound around the winding core 20 only once. Considering the cored adhesive sheet 1 in which the adhesive sheet 2 is wound two or more times, the adhesive sheet 2 portion in the schematic sectional view is repeatedly laminated while maintaining the order of lamination. Part of FIG. 1(b) showing the state in which the adhesive sheet 2 is wound twice is shown in FIG. 1(c) showing the state in which the adhesive sheet 2 is wound only once.

Next, when the design layer 10 includes the surface protective layer 18 and the solid pattern layer 16, the solid pattern layer 16 and the surface protective layer 18 are laminated in this order from the side closer to the base material layer 11 (design layer form 2, FIG. 2(b)). In the design layer form 2, by forming (printing) the solid pattern layer 16 in a single solid color, a solid color different from the color of the base material layer 11 can be obtained.
When the design layer 10 includes the surface protective layer 18 and includes both the solid pattern layer 16 and the pattern pattern layer 17, the solid pattern layer 16, the pattern pattern layer 17, and the surface protective layer 18 are arranged from the side closer to the base material layer 11. (design layer form 3, FIG. 2(c)). In the design layer form 3, the solid pattern layer 16 hides the influence of the color of the base material layer 11 and gives depth to the color of the pattern/picture layer 17. can be done.

In any of the design layer forms 1 to 3 described above, the surface protective layer 18 is laminated on the outermost surface of the design layer. .
The surface protective layer 18 has high resistance to scratches and stains, and can protect the surface protective layer 18 from scratches and stains. Therefore, the design layer 10 and the adhesive sheet 2 can be improved in scratch resistance, stain resistance, durability and reliability.

The surface protective layer 18 is a layer that has excellent releasability on its surface and can be easily released from the layer laminated thereon.
Here, in the state where the adhesive sheet 2 is wound around the core 20, the adhesive layer 13 related to the adhesive sheet 2 is laminated on the design layer 10 related to the adhesive sheet 2 on the inner side by one round. However, in the case of design layer forms 1 to 3, since the design layer 10 has the surface protective layer 18 on the outermost surface thereof, the design layer 10 and the adhesive layer 13 can be easily separated from each other. That is, in the state where the adhesive sheet 2 is wound around the winding core 20, the adhesive sheet 2 can be easily released from the adhesive sheet 2 on the inner side by one turn. Therefore, the adhesive sheet 2 can be easily pulled out from the adhesive sheet 1 with the winding core.
As an example, the adhesive sheet 1 with a winding core has a width of 900 mm and a winding number of 50 m.

As described above, the core-attached adhesive sheet 1 according to the present disclosure includes the core 20, the core release layer 21, and the adhesive sheet 2, and the adhesive sheet 2 includes the adhesive layer 13, the base layer 11, and the design. Includes layer 10 . The design layer 10 includes a surface protective layer 18 and at least one of the pattern layer 17 and solid pattern layer 16 . Each of the above layers of the pressure-sensitive adhesive sheet 1 with a winding core will be described below.

<Core>
The core 20 is a member that serves as a shaft around which the adhesive sheet 2 of the core-equipped adhesive sheet 1 according to the present disclosure is wound (taken up). The winding core 20 is generally cylindrical and may be solid or hollow. There are many. Although it does not have to be cylindrical, it is usually cylindrical in view of smoothness during winding and unwinding, and ease of transportation when the pressure-sensitive adhesive sheet 1 with a winding core is formed.
The material of the core 20 is a paper tube made by processing a special paperboard made from waste paper such as newspapers, magazines, and cardboard into a tubular shape, a resin tube made by molding a resin such as vinyl chloride resin into a tubular shape, and a metal such as aluminum. , a metal pipe, a wood pipe, a wooden shaft, etc., which are processed into a tubular shape from an alloy or the like, or a combination of the above. In addition, it may be in a spiral shape as long as it does not hinder the winding of the adhesive sheet 2 .

<Winding core release layer>
The core release layer 21 is a layer that is laminated (coated) on the peripheral surface of the core 20 and has excellent releasability from the adhesive layer 13 of the adhesive sheet 2 . The material of the core release layer 21 is not particularly limited as long as it is a material having releasability. A polyester resin etc. can be mentioned. These resins may be emulsion type, solvent type or non-solvent type. Although the thickness is not particularly limited, it is usually 25 μm or more and 150 μm or less.

<Base material layer>
The substrate layer 11 is a layer that serves as a base for the adhesive sheet 2 and a layer that serves as a substrate for forming the design layer 10, and is also called a backing material (backing paper when made of paper). The base layer 11 may be made of, for example, paper, woven fabric, non-woven fabric, or the like.
As the paper, fine paper, thin paper, kraft paper, linter paper, parchment paper, glassine paper, parchment paper, glassine paper, parchment paper, etc., which are used for various known decorative papers, or mixed paper made by mixing these papers with glass fiber or resin fiber, Impregnated paper impregnated with rubber latex, acrylic resin, or the like can be used as the paper. One example is a fleece paper composed of 75% pulp and 25% polyester resin. Fleece paper has dimensional stability and high strength, so it is often used overseas where DIY is popular.
Paper having a basis weight of about 20 to 200 g/m ² can be used.

As the woven fabric or non-woven fabric, a woven fabric or non-woven fabric using fiber made of polyester resin, polyamide resin, acrylic resin, or glass can be used. A woven fabric or non-woven fabric having a basis weight of about 20 to 200 g/m ² can be used.
The thickness of the base material layer 11 can normally be 20 μm or more and 2000 μm or less.
Moreover, the base material layer 11 may be appropriately colored according to the design to be expressed. Here, coloring refers to decorating the material itself of the base material layer 11 by coloring it, as will be described later. By coloring the base material layer 11, the solid pattern layer 16 can be omitted.

<Adhesive layer>
The adhesive layer 13 is laminated on the surface of the substrate layer 11 opposite to the design layer 10 (the lower side in FIG. 2, which is also referred to as the back surface side of the substrate layer 11). When the sheet 2 is used as wallpaper, it is a layer that exerts adhesiveness to the wall that is the adherend. The adhesive layer 13 has a plurality of concave shapes 13a that are open on both sides, that is, the side in contact with the base material layer 11 and the side in contact with the design layer 10 related to the adhesive sheet 2 on the inner side by one round. The diameters of the openings of the plurality of concave shapes 13a that are opened on the side surface and the back surface of the base layer 11 of the adhesive layer 13 generally have a distribution, but the average diameter on the same surface is the base. The design layer of the pressure-sensitive adhesive sheet 2 on the inner side by one round is that the side surface and the back side of the material layer 11 are the same or substantially the same, that is, the concave shape 13a is formed evenly on both sides of the adhesive layer 13. 10, sufficient adhesive strength to both the substrate layer 11 and the adherend, and removability from the adherend. Here, the opening diameters on both sides are substantially the same, that is, the concave shapes 13a are formed evenly on both sides of the adhesive layer 13, which means that the concave shapes 13a opening on the surface on the base layer 11 side are formed. When the average value of the diameter of each opening is ^Dave ₁ and the average value of the diameter of each opening of the concave shape 13a opening on the back surface is ^Dave ₂ ,
_| ^Dave1 ₋ ^{Dave2 |} _/Dave2≦0.5
means to satisfy the relationship of especially,
_| ^Dave1 ₋ ^{Dave2 |} _{/Dave2≦0.25}
satisfies the relationship of the pressure-sensitive adhesive sheet 2 on the one-round inner side of the design layer 10, sufficient adhesive strength to both the base layer 11 and the adherend, and re-peelability from the adherend. more preferable in terms of expression.
In addition, the adhesive layer 13 has elasticity, and since the plurality of concave shapes 13a each act as a fine suction cup, it can exhibit adhesive force (adsorption force) to various walls (Fig. 2). reference).

By reducing the difference in adhesive strength between both surfaces of the adhesive layer in this manner, the convenience of the adhesive sheet 2 can be greatly improved. That is, since there is no difference in the adhesive force between both surfaces of the adhesive layer, it becomes easy to adjust the required adhesive force according to the specific usage pattern of the adhesive sheet 2 . For example, when the adhesion between the adherend to which the adhesive sheet 2 is attached and the adhesive layer is strong, when the adhesive sheet 2 is peeled off, the adhesive sheet 2 is peeled off at the interface between the base material layer 11 and the adhesive layer 13, resulting in a so-called " There is a risk that "adhesive residue" may occur. In such a case, it is possible to easily adjust the balance of the adhesive force by applying a primer treatment to the adherend to weaken the adhesive force in advance.

In addition, since it is practically impossible to calculate the average value of the diameters of all openings, here, the diameter of the openings having a large diameter within the observation range of 1500 μm × 1100 μm The diameters of three openings were measured in order from the top, and the average value was obtained.
It should be noted that the method described above is merely an example of how to obtain the average value of the diameters of the respective openings, and it is desirable to appropriately optimize the method according to the actual shape of the adhesive layer 13 . For example, a peculiar opening such as an opening with an extremely large diameter or an opening with a distorted opening shape should be excluded from the calculation of the average value. In addition, instead of sampling the three openings in descending order of diameter, up to three openings in descending order of diameter are excluded, and the subsequent openings are used as samples for calculating the average value. good. Also, the number of samples N may be increased to more than three to improve accuracy.
Regarding the determination of the _number of samples N when ^obtaining the _average value, the standard deviations ^{σ(Dave1 (} _N )) and σ( ^Dave ₂ (N)) should be determined as the smallest number of samples that is judged to provide sufficient coverage as N increases. Normally, about 3≦N≦100, preferably about 10≦N≦30.

The adhesive layer 13 is formed, for example, using a liquid resin composition (acrylic emulsion) disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 2017-36404) by a manufacturing method described later. The resin composition used for the adhesive layer 13 includes, for example, poly(2-ethylhexyl acrylate) as a main component, sulfur, bicine: N,N-Bis(2-hydroxyethyl)glycine, N.I. N. -Those containing dimethyloctadecaamine or the like can be used.

The layer thickness of the adhesive layer 13 is desirably 1 μm or more and 500 μm or less. Below the lower limit of the above layer thickness range, it becomes difficult to form the concave shape, or the size of the concave shape becomes too small, resulting in a decrease in adhesion (adsorption) properties. On the other hand, if the upper limit of the above layer thickness range is exceeded, the flexibility of the pressure-sensitive adhesive sheet 2 is reduced, resulting in poor workability.
Furthermore, in order to evenly provide concave shapes 13a on both surfaces of the adhesive layer 13, the layer thickness t of the adhesive layer 13 is preferably in the range of 20 μm≦t≦40 μm.

The size (diameter) and density of the concave shapes 13a of the adhesive layer 13 can be adjusted by changing various conditions in the manufacturing process described below. For example, the density of the adhesive layer 13 can be used as an index representing the extent to which the concave shape 13a is included in the adhesive layer 13 . Although the density of the adhesive layer 13 is not particularly limited, it can be, for example, 0.1 g/cm ³ or more and 0.7 g/cm ³ or less. In particular, sufficient adhesion to both the substrate layer 11 and the adherend, releasability from the design layer 10 related to the pressure-sensitive adhesive sheet 2 on the inner side by one round, and removability from the adherend, It is preferably 0.2 g/cm ³ or more and 0.6 g/cm ³ or less. Also, the size (diameter) of the concave shape 13a is not particularly limited, but can be, for example, 1 μm or more and 300 μm or less. When the concave shape 13a can be regarded as a sphere, the size of the concave shape 13a is the diameter of the sphere. If the concave shape 13a cannot be regarded as a sphere, the size of the concave shape 13a is defined as the diameter of a sphere having the same volume as the concave shape 13a.

<Foamed resin layer>
The foamed resin layer 14 is a layer provided between the base material layer 11 and the design layer 10, but it is not an essential configuration in the adhesive sheet 1 with a winding core of the present disclosure.
The foamed resin layer 14 is a layer formed by foaming a foaming agent-containing unfoamed resin layer. The foaming agent-containing resin layer is not particularly limited as long as it foams by the action of a chemical foaming agent or physical foaming agent (for example, foams when heated), but it is preferably an ethylene resin. preferable.
Examples of the resin forming the foamed resin layer 14 include ethylene homopolymer resin, ethylene-vinyl acetate copolymer resin (EVA), ethylene-methyl acrylate copolymer resin (EMA), and ethylene-ethyl acrylate copolymer resin. (EEA), ethylene-alkyl acrylate copolymer resin having 3 to 5 carbon atoms, ethylene-methyl methacrylate copolymer resin (EMMA), ethylene-methacrylic acid copolymer resin (EMAA), vinyl chloride resin, etc. polyolefin resins such as copolymer resins, polyethylene, propylene, polystyrene, polypropylene, polybutene, polybutadiene and polyisoprene, and mixtures of these resins.
These resins can be easily resin-crosslinked by irradiation with ionizing radiation, and the irradiation can improve scratch resistance, wear resistance, etc., surface strength, and the like. Among these resins, EVA resins and EMAA resins are preferred, and EMAA resins are particularly preferred, in terms of surface strength such as excellent scratch resistance and abrasion resistance.
For example, a resin composition containing an ethylene-based resin (EVA resin, EMAA resin, etc.), an inorganic filler, a pigment, a thermally decomposable foaming agent, and a cell modifier can be preferably used. In addition, stabilizers, lubricants and the like can be used as additives. Although the thickness of the foamed resin layer 14 is not particularly limited, it is preferably about 50 to 600 μm, more preferably about 100 to 500 μm.

When EVA resin is used as the resin component, the vinyl acetate unit (copolymerization ratio) in the EVA resin is not particularly limited, but is preferably about 5 to 30% by mass, more preferably about 10 to 20% by mass. more preferred. The melt flow rate value (MFR) of the resin component is not particularly limited, but is preferably about 5 to 75 g/10 minutes, more preferably about 40 to 70 g/10 minutes. In this specification, MFR is a value measured by the test method described in JIS K 7210 (test method for flow of thermoplastics). As the test conditions, "190°C, 21.18 N (2.16 kgf)" described in JIS K 6760 was adopted. The foamed state of the foamed resin layer (for example, the size of the foamed cells, the density of the foamed cells, etc.) is not particularly limited, and can be appropriately designed according to the type of pressure-sensitive adhesive sheet, the application, and the like.
Further, when EMAA resin is used as the resin component, the methacrylic acid unit (copolymerization ratio) in the EMAA resin is preferably about 4 to 20% by mass. Although the melt flow rate value of the resin component depends on the type of polymer used, it is usually preferably 60 to 200 g/10 minutes. In particular, it is advantageous in that a good foaming state can be maintained even in a high range of 100 to 200 g/10 minutes.

The foaming agent used for the foamed resin layer 14 is preferably a chemical foaming agent among the foaming agents described above, and a thermally decomposable foaming agent is preferable among the chemical foaming agents. The thermally decomposable foaming agent can be selected from known foaming agents. Examples thereof include azo compounds such as azodicarbonamide (ADCA) and azobisformamide; vidrazide compounds such as oxybenzenesulfonylhydrazide (OBSH) and paratoluenesulfonylhydrazide. The amount of the thermally decomposable foaming agent to be blended can be appropriately set according to the type of the foaming agent, the foaming ratio, and the like. Since the expansion ratio is 1.5 times or more, preferably about 3 to 7 times, the amount of the thermally decomposable foaming agent should be about 1 to 20 parts by mass with respect to 100 parts by mass of the resin component. is preferred. In addition, the physical blowing agent includes thermally expandable microcapsules. Microcapsules encased in thermoplastic polymeric shells, such as divinylbenzene copolymers, with average diameters in the range of 1-100 μm are available.

Into the foamed resin layer 14, additives such as cell modifiers, inorganic fillers and pigments described below can be blended.
As the cell regulator, metal soaps such as zinc stearate can be used. The content of the cell modifier is preferably about 0.3 to 10 parts by mass, more preferably about 1 to 5 parts by mass, per 100 parts by mass of the resin component.
Examples of inorganic fillers include calcium carbonate, aluminum hydroxide, magnesium hydroxide, antimony trioxide, zinc borate, molybdenum compounds, silica, alumina, kaolin, and the like. By including the inorganic filler, an effect of suppressing opening, an effect of improving surface characteristics, and the like can be obtained. The amount of the inorganic filler compounded is preferably about 0 to 100 parts by mass, more preferably about 20 to 70 parts by mass, per 100 parts by mass of the resin component.

Pigments include, for example, titanium oxide, zinc white, carbon black, black iron oxide, yellow iron oxide, yellow lead, molybdate orange, cadmium yellow, nickel titanium yellow, chrome titanium yellow, iron oxide (rouge), cadmium red, Inorganic pigments such as ultramarine blue, Prussian blue, cobalt blue, chromium oxide, cobalt green, aluminum powder, bronze powder, mica titanium, zinc sulfide; Cyclic (isoindolinone, isoindoline, quinophthalone, perinone, flavanthrone, anthrapyrimidine, anthraquinone, quinacridone, perylene, diketopyrrolopyrrole, dibromoanzanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone, halogenated phthalocyanine), etc. organic pigments. The content of the pigment is preferably about 10 to 50 parts by mass, more preferably about 15 to 30 parts by mass, per 100 parts by mass of the resin component.

<Primer layer>
The primer layer is a layer provided to improve the bonding strength between the base material layer 11 and the adhesive layer 13, but is not an essential component in the adhesive sheet 1 with a winding core of the present disclosure.
When the base material layer 11 is made of a polyolefin resin, a polyester resin, a vinyl chloride resin, or the like, the primer layer is made of a two-liquid curing type urethane resin composed of a polyol and an isocyanate and using an isocyanate as a curing agent, or a chlorinated resin using an isocyanate as a curing agent. A vinyl-vinyl acetate copolymer system resin or the like can be used. Although the thickness is not particularly limited, it is usually 0.5 μm or more and 5 μm or less.

The bonding strength between the base material layer 11 and the adhesive layer 13 is improved by the primer layer. Therefore, in the pressure-sensitive adhesive sheet 1 with a winding core, the difference between the bonding strength between the pressure-sensitive adhesive layer 13 and the base material layer 11 laminated on its upper surface and the pressure-sensitive adhesive strength between the pressure-sensitive adhesive layer 13 and the design layer 10 laminated on its lower surface is It can be even bigger. Therefore, when the adhesive sheet 2 is unwound from the adhesive sheet 1 with a core, the adhesive layer 13 and the design layer 10 related to the adhesive sheet 2 on the inner side by one turn are more easily peeled off, and the adhesive sheet 1 with a core is adhered. The sheet 2 can be unwound more easily.
In addition, in the adhesive sheet 2, since the bonding strength between the base material layer 11 and the adhesive layer 13 is improved by the primer layer, the adhesive sheet 2 attached to the adherend such as a wall or ceiling can be used as an adherend. When the adhesive layer 13 is peeled off from the adhesive layer 13, the adhesive layer 13 remains on the adherend side, which is the so-called adhesive residue.

<Design layer>
As described above, the design layer 10 includes the surface protective layer 18 and at least one of the pattern layer 17 and the solid pattern layer 16 . In the present disclosure, in the adhesive sheet 2, a layer present on the upper surface side (opposite side to the side on which the adhesive layer 13 is laminated) from the base layer 11 (the foamed resin layer 14 when the foamed resin layer 14 is present) are collectively called a design layer 10 . The lamination form of each layer of the design layer 10 is as described above.

<Pattern layer>
Formation of the pattern layer means that by laminating the pattern pattern layer 17, which is a layer of ink, as part of the design layer 10, the color tone changes in the plane (not uniform over the entire surface) to form a desired pattern in the plane. It is a form to do. The pattern layer includes a pattern pattern layer 17 in which the area laminated in the plane is localized (that is, the entire surface is not covered) and a solid pattern layer in which the entire surface is covered and the color tone in the plane is uniform. There are 16
These pattern layers can be formed by a known printing method using a known ink as described later.
Alternatively, a patterned metal film localized in a plane may be transferred onto a desired surface by a known transfer printing method, or an unnecessary area may be printed by a known method after a metal film is once laminated on the entire desired surface. There is also a form in which a patterned metal film localized in a plane is formed by removing the metal film and forming a patterned metal film localized in a desired region. In the present invention, lamination of a metal film on localized pattern regions is also included as one form of the patterned pattern layer 17 .

The pattern/picture layer 17 is formed by appropriately printing a desired pattern using a known ink and a known printing method. Applicable known printing methods include plate printing methods such as gravure printing, silk screen printing, lithographic offset printing, and flexographic printing, or plateless printing methods such as ink jet printing and various transfer printing. be able to.
The ink is prepared by adding a colorant to a resin binder and, if necessary, various additives.
The resin binder is selected according to the material to be printed and the required performance. For example, acrylic resin, vinyl chloride-vinyl acetate copolymer, urethane resin, polyester resin, cellulose resin, polyamide resin, An alkyd-based resin or the like is used.
Examples of coloring agents include red iron oxide, vermillion red, cadmium red, titanium yellow, yellow lead, iron yellow, ultramarine blue, Prussian blue, cobalt blue, verdigris, iron black, carbon black, titanium white, zinc white, antimony white, and the like. organic pigments or dyes such as quinacridone red, polyazo red, isoindolinone yellow, nickel-azo complex, phthalocyanine blue, azomethine azo black pigment, and perylene black pigment, flake-like foils of metals such as aluminum, brass, and tin Metal pigments consisting of flakes, titanium dioxide-coated mica, basic lead carbonate, pearlescent (pearl) pigments consisting of scale-like foil flakes such as shells such as pearl oysters, etc. are used singly or in combination of two or more kinds. be able to.
As the pattern, a wood grain pattern, a pebble pattern, a cloth pattern, a leather grain pattern, a geometric pattern, letters, a solid pattern, or a combination thereof can be appropriately selected according to the desired design appearance.

<solid image layer>
As described above, the solid picture layer 16 is a layer of the picture layers in which the plane is entirely covered with a layer of ink so that the color tone in the plane is uniform. The method of forming (printing) the solid pattern layer 16 and the ink used are the same as those described for the pattern layer 17 above. The pattern is naturally a solid colored pattern. In the design layer 10 of the present disclosure, at least one of the pattern pattern layer 17 and the solid pattern layer 16 exists. need not be strictly distinguished.

<Surface protective layer>
The surface protective layer 18 is laminated on the outermost surface of the design layer 10 , that is, the adhesive sheet 2 . The surface protective layer 18 has high resistance to scratches and stains, and can protect the surface protective layer 18 from scratches and stains. It is a layer that can increase the strength. The surface protective layer 18 is a layer that has excellent releasability on its surface and can be easily released from the layer laminated thereon.
The surface protective layer 18 can be formed by lamination of resin layers, application of a coating film, or a combination of lamination of resin layers and application of a coating film.

Examples of the resin forming the surface protective layer 18 include silicone resins, organic resin-modified silicone resins, fluororesins, aminoalkyd resins, melamine resins, and acrylic resins if releasability from the adhesive layer 13 is emphasized. , polyester resins, and the like. These resins may be water-based, emulsion-type, solvent-type or non-solvent-type.
General materials for protection include polyethylene, polypropylene (PP), ethylene-propylene-butene copolymer, ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, olefinic thermoplastic elastomer, etc. Olefin resins, acrylic resins such as polymethyl methacrylate, polyethyl methacrylate, methyl methacrylate-butyl methacrylate copolymer, vinyl chloride such as polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl chloride copolymer resins, polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymer, polyester resins such as polyester thermoplastic elastomer, polystyrene, acrylonitrile-styrene copolymer, acrylonitrile - Butadiene-styrene copolymer (ABS) and other styrene resins, polyisoprene, natural rubber, ethylene propylene rubber (EPR), chloroprene rubber and other rubbers, urethane resins, cellulose resins, polycarbonate resins, polyamide resins etc. Note that resins other than those exemplified above may be used. The thickness of the surface protective layer 18 may be appropriately selected depending on the application, required performance, etc., but is usually set to 0.5 μm or more and 100 μm or less.

In the case of coating of a coating film, for example, known thermosetting resins (one-component curing type or two-component curing type) such as thermosetting urethane resin, thermosetting polyester resin, epoxy resin, melamine resin, etc. , Known ionizing radiation curable resins such as acrylates, epoxies, and unsaturated polyesters that crosslink or polymerize by irradiation with ionizing radiation such as ultraviolet rays and electron beams, water-based acrylic resins, vinyl chloride-vinyl acetate copolymers It can be appropriately selected from coalescence, polyester resin, polyurethane resin, chlorinated polypropylene resin, and chlorinated polyethylene resin. The thickness of the coating film can be usually 0.5 μm or more and 10 μm or less (film thickness after curing).

In the core-attached adhesive sheet 1 according to the present disclosure described above, the adhesive sheet 2 is wound around the core 20, and the adhesive sheet 2 does not have a release liner. Therefore, the pressure-sensitive adhesive sheet 2 unwound from the pressure-sensitive adhesive sheet 1 with a winding core exposes the pressure-sensitive adhesive layer 13 on the back surface without removing the release paper, and can be applied as it is.
For example, the pressure-sensitive adhesive sheet 2 can be used as a wallpaper sheet and directly attached to a wall or ceiling in a room. That is, the pressure-sensitive adhesive sheet 2 according to the pressure-sensitive adhesive sheet 1 with a winding core of the present disclosure does not require gluing and does not require removal of the release paper when it is used as wallpaper, that is, when it is attached to a wall or ceiling. Therefore, when the wallpaper is applied, the removed release paper is scattered on the floor, and the risk of the craftsman falling due to its low friction can be avoided. In addition, the removed release paper is usually discarded, but since it does not have the release paper, it has the advantage of being environmentally friendly.
Also, when the adhesive sheet 2 is used as a desk mat with adhesive, it can be stuck on the desk as it is, and the same effects as in the case of using it as the wallpaper sheet can be obtained.

Further, in the adhesive sheet 1 with core, the back side of the adhesive layer 13 of the adhesive sheet 2 is laminated to the outermost surface of the design layer 10 of the adhesive sheet 2 on the inner side by one round. As described above, the surface protective layer 18 is exposed on the outermost surface of the design layer 10 , that is, the pressure-sensitive adhesive sheet 2 . Therefore, the back side of the adhesive layer 13 related to the adhesive sheet 2 is laminated to the surface protective layer 18 related to the adhesive sheet 2 on the inner side by one round. The surface protective layer 18 has excellent releasability on its surface due to stain resistance and the like, and is a layer that can be easily released from the layers laminated thereon. The pressure-sensitive adhesive sheet 2 wound many times can be easily separated at the interface between the pressure-sensitive adhesive layer 13 and the surface protective layer 18 between the pressure-sensitive adhesive sheets 2 that are laminated one turn apart. That is, the adhesive sheet 2 can be easily unwound from the adhesive sheet 1 with the winding core.
In addition, since the pressure-sensitive adhesive sheet 1 with a winding core of the present disclosure has a winding shape (cylindrical shape), there is an advantage that it is easy to store and transport.

In the adhesive sheet 2 related to the adhesive sheet 1 with a winding core, the adhesive layer 13 is laminated in contact with the base material layer 11. Since the base material layer 11 is made of paper, woven fabric, non-woven fabric, or the like, Since the surface is rough, the adhesiveness with the adhesive layer 13 can be made high. Therefore, together with the excellent releasability of the surface protective layer 18, the adhesive sheet 2 can be more easily and stably unwound from the adhesive sheet 1 with a winding core.
In the adhesive sheet 2, since the adhesiveness between the base material layer 11 and the adhesive layer 13 is high as described above, the adhesive sheet 2 attached to an adherend such as a wall or a ceiling can be used as a wallpaper sheet. The adhesive layer 13 is less likely to remain on the adherend side when peeled from the adhesive layer, which is a so-called adhesive residue. Therefore, the pressure-sensitive adhesive sheet 2 can be peeled off from the adherend while maintaining its layer structure without being destroyed. In addition, since the adhesive effect of the adhesive layer 13 is mainly a sucker effect caused by the recessed shape 13a, the adhesive sheet 2 after peeling can be attached to another adherend as a wallpaper sheet. That is, the pressure-sensitive adhesive sheet 2 related to the pressure-sensitive adhesive sheet 1 with a winding core has an effect of good reworkability.
When the adhesive sheet 2 has a primer layer between the adhesive layer 13 and the base material layer 11, the above-mentioned adhesiveness is further enhanced, so that the above effects can be further obtained.

(Second embodiment)
Next, the core-attached adhesive sheet 101 according to the second embodiment of the present disclosure will be described. A schematic perspective view of the core-attached adhesive sheet 101 according to the second embodiment is omitted because it is the same as the schematic perspective view of the core-attached adhesive sheet 1 according to the first embodiment shown in FIG. In addition, the cross section of the adhesive sheet 101 with the core in which the adhesive sheet 102 according to the second embodiment is wound around the core 20 twice is cut perpendicularly to the axis of the core 20. A cross-sectional view showing a part of the outline is also omitted because it is similar to FIG. 1(b).

The core-attached adhesive sheet 101 is obtained by winding an adhesive sheet 102 around a core 20 having a release layer 21 on its surface. The adhesive sheet 102 has an adhesive layer 13, a substrate layer 11, and a design layer laminated in this order. The above points are the same as those of the pressure-sensitive adhesive sheet 1 and the pressure-sensitive adhesive sheet 2 according to the first embodiment. The only difference between the first embodiment and the second embodiment is the configuration of the design layer, and other points are the same as the first embodiment. That is, the core release layer 21 on the surface of the core 20 and the adhesive layer 13 of the adhesive sheet 102 are in contact with each other. in contact. Further arbitrary layers may be provided at arbitrary positions between the respective layers as long as the order of lamination is not disturbed and the effects of the present disclosure are not significantly impaired.
For example, a foamed resin layer 14 may be provided between the base material layer 11 and the design layer 110 . Also, a primer layer may be provided between the adhesive layer 13 and the base material layer 11 .

The design layer 110 in the second embodiment includes at least the design resin layer 12, and the design resin layer 12 is the outermost surface of the design layer 110 (the side of the base layer 11 side of the design layer 110 of the pressure-sensitive adhesive sheet 102). is the opposite surface), ie, is laminated so as to be positioned on the outermost surface of the adhesive sheet 102 .
The layer structure of the design layer 110 according to the second embodiment will be specifically described below.
FIG. 3A shows a schematic cross-sectional view of the case where the design layer 110 is composed only of the design resin layer 12 (design layer configuration 4). In general, the surface of the design resin layer 12 (the surface opposite to the substrate layer 11) is formed with an uneven pattern 12a, and the design resin layer 12 functions as a design pattern due to the shadows and tactile sensations associated with the uneven pattern 12a. is. An example of the picture pattern related to the uneven pattern 12a of the design resin layer 12 is a conduit pattern related to a wood grain pattern.

In the design layer forms 1 to 3, the surface protective layer 18 may be replaced with the design resin layer 12 . Also in these cases, the design resin layer 12 is laminated so as to be the surface of the design layer 110 (the surface opposite to the substrate layer 11).
When the surface protective layer 18 is replaced with the design resin layer 12 in the design layer configuration 1, the design layer 110 is laminated in the order of the design layer 17 and the design resin layer 12 from the side closer to the base material layer 11 (design Layer morphology 5, FIG. 3(b)). In the design layer form 5, the pattern of the design layer 17 and the uneven pattern 12a of the design resin layer 12 are combined to express a rich design. One example is a combination in which the pattern of the design layer 17 is a wood grain pattern and the uneven pattern 12a of the design resin layer 12 is a conduit pattern.

When the surface protective layer 18 is replaced with the design resin layer 12 in the design layer configuration 2, the design layer 110 is laminated in the order of the solid design layer 16 and the design resin layer 12 from the side closer to the base material layer 11 (design Layer morphology 6, FIG. 3(c)). In the design layer form 6, the color of the solid pattern layer 16 reinforces the uneven pattern 12a related to the design resin layer 12, and a rich design can be expressed. An example of the design pattern related to the uneven pattern 12a of the design resin layer 12 is a pattern that imitates trowel marks on the plastered surface of plaster, cement, wall soil, or the like.
When the surface protective layer 18 is replaced with the design resin layer 12 in the design layer configuration 3, the design layer 110 consists of the solid design layer 16, the pattern design layer 17, and the design resin layer 12 in this order from the base material layer 11 side. Laminated (design layer form 7, FIG. 3(d)). In the design layer form 7, since the uneven pattern 12a according to the design resin layer 12 is added to the highly designed pattern according to the design layer form 3, it is possible to make the pattern more highly designed. can.

<Design resin layer>
The design resin layer 12 is laminated on the outermost surface of the design layer 110 as described above for each form of the design layer 110, and a plurality of uneven patterns 12a are formed on the surface. FIG. 4 shows a schematic perspective cross-sectional view of an adhesive sheet 102 having a design layer 110 composed only of the design resin layer 12 according to the design layer configuration 4 shown in FIG. 3(a).
The uneven pattern 12a on the design resin layer 12 expresses, for example, wood surface unevenness such as conduit grooves of wood, raised annual rings of the autumn wood part of the surface of embossed wood, or a surface uneven pattern of fabric (so-called texture). express the unevenness of the surface of stone materials such as granite and sandstone, express the joint grooves of brickwork and tiles, express the unevenness of hairline processing on metal surfaces, and plaster, cement, wall soil, etc. An uneven pattern such as trowel marks or sprayed paint marks on the plastered surface may be expressed, and the form (uneven pattern) may be of any form.

The resin forming the design resin layer 12 can be appropriately selected from the materials and thicknesses exemplified above for the surface protective layer 18 . The thickness of the design resin layer 12 may be appropriately selected according to the application, required performance, etc., but is usually set to 0.5 μm or more and 100 μm or less.
Normally, the design resin layer 12 is designed to hide the base material layer 11 on the back side and the adherend. Therefore, the design resin layer 12 is made opaque and concealable by adding a coloring agent with high concealability such as titanium white. However, when it is necessary to see through the design resin layer 12 to see the design appearance of the back surface of the base layer 11, the pattern pattern layer 17, the solid pattern layer 16, etc., the design resin layer 12 is colored with concealing properties. It does not contain agents or additives, and is transparent enough to allow the visual appearance of the design on the back side. The term "transparency" as used herein includes not only colorless transparency but also colored transparency and matte transparency.

The pressure-sensitive adhesive sheet 102 of the present invention is decorated (also referred to as decoration treatment) in order to enhance its design appearance. Decoration is roughly classified into coloring decoration and shape decoration.
Coloring and decoration are roughly classified into coloring and pattern layer formation.
Coloring refers to adding a coloring agent to desired layers such as the design resin layer 12 and the base material layer 11 without having the pattern layer 17 and the solid pattern layer 16, thereby imparting a desired color tone to the entire surface of the layer. It is a form of giving. Here, color tone means visual attributes including hue, lightness, saturation, and glossiness.
In addition, as another form of imparting a desired color tone to the surface of a desired layer, aluminum, nickel, chromium, gold, silver, aluminum, nickel, chromium, gold, silver, or the like is applied to the surface of the desired layer by vacuum deposition, sputtering, electroless plating, lamination of metal foil, or the like. There is also a form in which metal thin films such as copper, tin, and brass are laminated. In the present invention, lamination of a metal film over the entire surface is also included as one mode of coloring. These metal thin films can also be considered as the patterned pattern layer 17 or the solid patterned layer 16 .
The pattern layer formation is to form at least either the pattern pattern layer 17 or the solid pattern layer 16 described in the first embodiment.

As the shape decoration, there is a mode in which an uneven pattern is formed on the surface of the pressure-sensitive adhesive sheet 2, 102, the interface between each constituent layer, or both surfaces thereof. As the uneven pattern, various shapes such as those exemplified as the uneven pattern on the design resin layer 12 can be applied. Further, various known shaping methods can be applied as the shaping method of the uneven pattern. A commonly used shaping method is to prepare an embossing plate (shaping mold) having the same shape as the desired uneven pattern in a plan view and having a reverse unevenness, and emboss the surface of the heat-softened design resin layer 12 to be shaped. In this method, the plate is pressed to shape the surface of the design resin layer 12 into the uneven shape of the surface of the embossed plate, the softened resin is cooled and solidified to fix the formed uneven pattern, and then the embossed plate is released. .

In the cored adhesive sheet 101, the back side of the adhesive layer 13 of the adhesive sheet 102 is laminated to the outermost surface of the design layer 110 of the adhesive sheet 102 on the inner side by one round. As described above, the design resin layer 12 is exposed on the outermost surface of the design layer 110, that is, on the outermost surface of the pressure-sensitive adhesive sheet . Therefore, the back side of the adhesive layer 13 related to the adhesive sheet 102 is laminated to the design resin layer 12 related to the adhesive sheet 102 on the inner side by one round. As described above, the design resin layer 12 has an uneven pattern 12a formed on its surface, and the adhesive layer 13 contacts only the convex portions of the design resin layer 12 surface. Since the area is small, the adhesive layer 13 and the design resin layer 12 can be easily separated from each other due to the original adhesive strength of the adhesive layer 13 . Therefore, the adhesive sheet 102 wound around the winding core 20 in many turns can be easily separated from each other at the interface between the adhesive layer 13 and the design resin layer 12 among the adhesive sheets 102 laminated one turn apart. can. That is, the adhesive sheet 102 can be easily unwound from the adhesive sheet 101 with the core.
Other effects of the core-attached adhesive sheet 101 and the adhesive sheet 102 according to the second embodiment are the same as those of the core-attached adhesive sheet 1 and the adhesive sheet 2 of the first embodiment described above. be.

[Manufacturing method of pressure-sensitive adhesive sheet with winding core]
(embodiment)
Next, a method for manufacturing the core-attached adhesive sheet 1 according to the first embodiment and the core-attached adhesive sheet 101 according to the second embodiment will be described. FIG. 5 is a diagram showing a manufacturing apparatus for core-attached adhesive sheets 1 and 101, and FIG. 6 is a schematic cross-sectional view showing a laminated state during manufacturing of core-attached adhesive sheets 1 and 101. As shown in FIG. Here, as an example, the case where the adhesive sheet 102 is composed of the adhesive layer 13, the base material layer 11, the design layer 17, and the design resin layer 12 and laminated in the above order will be described. This form corresponds to the case where the design layer 110 is the design layer form 5 described above.

By laminating the core release layer 21 on the surface of the core 20, the core 20 having the core release layer 21 on the surface is prepared (FIG. 6(h)).
Separately, the acrylic emulsion composition disclosed in Patent Document 2 for forming the adhesive layer 13 is placed in a stirrer, and the composition is stirred while nitrogen gas is mixed to remove air bubbles from the composition. , to prepare a bubble-containing composition 130 (P1 in FIG. 5: foaming step).
Next, separately, a release base sheet 25 is prepared as a so-called release paper (FIG. 6(a)), and the cell-containing composition 130 is applied onto the release base sheet 25 to obtain a cell-containing composition. A liquid coating layer 130 is formed (P2 in FIG. 5: coating step). In the coating step, for example, a comma coater can be used, but other known coating methods may also be used.

After the liquid coating layer of the cell-containing composition is applied onto the release base sheet 25, the liquid coating layer is dried while being heated to form the adhesive layer 13 as a solidified coating layer of the cell-containing composition. (P3 in FIG. 5: drying step, FIG. 6(b)). In the drying step, for example, a drying oven with a temperature of about 60° C. to 140° C. can be used. As the drying time, for example, about 30 seconds to 10 minutes can be exemplified. Further, in the drying step, drying may be accelerated while blowing air to the bubble-containing composition 130 . By performing the drying step, the average diameter of both the exposed surface side (upper side in FIG. 6) and the release base sheet 25 side (lower side in FIG. 6) of the solidified coating layer of the bubble-containing composition 130 is the same. A concave shape 13a having substantially the same opening is formed, and the adhesive layer 13 is formed. This concave shape 13a is formed by the bubbles in the vicinity of the exposed surface side among the bubbles contained in the bubble-containing composition 130 being broken, and part of the shape of the bubbles remaining on the exposed surface side of the solidified coating layer. On the other hand, the shape of the interface between the bubbles in the solidified composition and the bubbles in the solidified composition is fixed by the solidification of the bubble-containing composition. Formed by Here, if the bubbles are broken in a state where the bubble-containing composition 130 is insufficiently hardened, the concave shape 13a is less likely to remain. On the other hand, if the bubble-containing composition 130 hardens before the bubbles break, there is a risk that the concave shape 13a will not be formed. Therefore, it is desirable that the drying process be performed under the condition that the bubbles are broken while the bubble-containing composition 130 is cured to some extent. Therefore, the temperature and the amount of air blown in the drying process greatly affect the state of the concave shape 13a.

Separately, a substrate layer 11 is prepared (FIG. 6(c)), and a pattern layer 17 is laminated on one surface of the substrate layer 11 by a method such as printing (FIG. 6(d)). Next, the design resin layer 12 is laminated on the surface of the design layer 17 opposite to the substrate layer 11 side, and the exposed surface of the design resin layer 12 is formed with an uneven pattern 12a by a method such as embossing. to obtain an adhesive-free adhesive sheet (FIG. 6(e)).

After the adhesive layer 13 is formed by the drying process, the exposed adhesive layer 13 is bonded to the base material layer 11 of the adhesive-free adhesive sheet (P4 in FIG. 5: bonding process, FIG. 6(f)). In this attaching step, since attachment is performed by the adsorption force (adhesive force) of the recessed shape 13a of the adhesive layer 13, no heating is required, and bonding can be performed with only a slight pressure. Therefore, the substrate layer 11, pattern layer 17 and design resin layer 12 are not damaged.
When the affixing step is completed, the adhesive sheet 102 having the release base sheet 25 is obtained. In forming the adhesive layer 13 as described above, if the adhesive layer 13 is first formed on the releasable base sheet 25, in the production of the adhesive sheet 102, the base layer 11, the patterned pattern layer 17 and the The pressure-sensitive adhesive sheet 102 can be efficiently manufactured without damaging the design resin layer 12 due to heat during the formation of the pressure-sensitive adhesive layer 13 or low-molecular-weight components such as solvents in the bubble-containing composition.

Next, the release base sheet 25 is peeled off from the release base sheet 102 having the release base sheet 25 to form the pressure sensitive adhesive sheet 102 (P5 in FIG. 5: peeling step, FIG. 6(g)), and the exposed The adhesive sheet 102 is wound around the winding core 20 in the direction in which the adhesive layer 13 is laminated on the core release layer 21 (P6 in FIG. 5: winding step, FIG. 6(i)). After the second round, the exposed adhesive layer 13 is wound up so as to be laminated on the design layer 110 related to the inner adhesive sheet 102 by one round. As described above, the pressure-sensitive adhesive sheet 101 with core according to the embodiment of the manufacturing method can be manufactured.

In other words, the manufacturing method of the core-attached pressure-sensitive adhesive sheets 1 and 101 according to the present disclosure includes a step of preparing a core 20 having a core release layer 21 on the surface thereof, and a release base sheet. 25, coating the cell-containing composition 130 on the release base sheet 25, heating and drying the cell-containing composition 130 to form the adhesive layer 13, and a base layer. a step of bonding the substrate layer side surface of the laminate of 11 and the design layer 10 to the adhesive layer 13 formed on the release substrate sheet 25 to form an adhesive sheet having a release substrate sheet; A winding core having a step of peeling a release base sheet 25 from an adhesive sheet having a release base sheet to form the adhesive sheets 2 and 102, and a step of winding the adhesive sheets 2 and 102 around the core 20. It is a manufacturing method of the attached pressure-sensitive adhesive sheet 1, 101.

<Releasable base sheet>
The release base sheet 25 functions as a so-called release paper, but is used only in an intermediate process when manufacturing the pressure-sensitive adhesive sheet 1 or 101 with a core according to the above embodiment. This structure does not exist in the completed pressure-sensitive adhesive sheet 1 or 101 with a core. The release base sheet 25 avoids damage to the layers constituting the adhesive sheets 2 and 102 due to heat during the formation of the adhesive layer 13 and low molecular weight components such as solvents in the bubble-containing composition, and is easy to handle during manufacturing. , and is peeled off immediately before being wound on the winding core 20 as described above.

As the releasable base sheet 25, various forms such as a conventionally known release film, separate paper, separate film, paper, release film, and release paper can be appropriately used. For example, fine paper, coated paper, impregnated paper, plastic film, or the like having a release layer formed on one side or both sides thereof may be used. The release layer is not particularly limited as long as it is a material having release properties, but examples include silicone resins, organic resin-modified silicone resins, fluororesins, aminoalkyd resins, melamine resins, acrylic resins, polyester resins, and the like. can be mentioned. These resins may be emulsion type, solvent type or non-solvent type. When a release film having a release layer is used, for example, silicone release type PET (polyethylene terephthalate) film, untreated PET film, PP film, silicone release type paper, or the like can be used.

The thickness of the release base sheet 25 is, for example, desirably 10 μm or more and 100 μm or less, and more desirably 20 μm or more and 60 μm or less. Below the lower limit of the above layer thickness range, there is no stiffness and it becomes difficult to peel off. On the other hand, if the upper limit of the above layer thickness range is exceeded, the stiffness is too strong and the workability at the time of application is reduced.
As the releasable base sheet 25, a commercially available one may be used. For example, a 38 μm thick polyester film (Mitsui Chemicals Tocello Co., Ltd. manufactured by a company, trade name: SP-PET-01), and the like.

In the manufacturing method according to the embodiment, the adhesive layer 13 is laminated on the release base sheet 25 and then joined to the non-adhesive adhesive sheet. Therefore, each layer related to the non-adhesive adhesive sheet, that is, each layer except the adhesive layer 13 in the adhesive sheets 2 and 102 is exposed to heat in the drying process when forming the adhesive layer 13 and low molecular weight components such as solvents in the bubble-containing composition. not be affected by Therefore, the cored adhesive sheets 1, 101 and the adhesive sheets 2, 102 can be of high quality.

In addition, in the manufacturing method according to the embodiment, although the release base sheet 25 is used, the release base sheet 25 is wound up without being destroyed by itself during the process. The releasable base sheet 25 that is wound up independently without being broken can be reused when manufacturing another pressure-sensitive adhesive sheet 1 or 101 with a core. Therefore, although the releasable base sheet 25 is used during the manufacturing process, it can be reused without being discarded after peeling, which is an environmentally friendly manufacturing method.
The core-attached pressure-sensitive adhesive sheets 1 and 101 manufactured by the manufacturing method according to the embodiment also naturally have the effects described above for the core-attached adhesive sheets 1 and 101 .

Although the core-attached pressure-sensitive adhesive sheet and the method for manufacturing the core-attached pressure-sensitive adhesive sheet according to the present disclosure have been described above, the present disclosure is not limited to the above embodiments. The above embodiment is an example, and in any case, what has substantially the same configuration as the technical idea described in the claims of the present disclosure and has the same effect It is included in the technical scope of the disclosure.

In the core-attached adhesive sheets 1 and 101 according to the present disclosure, the adhesive sheets 2 and 102 can be easily unrolled. The unrolled adhesive sheet 2, 102 can be applied to walls and ceilings as it is as an adhesive wallpaper sheet without peeling off the release base sheet 25. - 特許庁Also, when the adhesive sheets 2 and 102 are used as a desk mat with adhesive, they can be stuck on the desk as they are. That is, the adhesive sheets 2 and 102 are excellent in workability and can be used as an adhesive sheet that prevents overturning due to release paper. In addition, in the state of the pressure-sensitive adhesive sheets 1 and 101 with a core, they are in a roll (rolled up) shape, which is convenient for storage, transportation, or display. It is also useful as a personal wallpaper sheet for DIY purposes. Moreover, the adhesive sheets 2 and 102 can be suitably used not only for the interior decoration of houses and buildings, but also for the interior decoration of transportation equipment such as automobiles and railway vehicles.

Reference Signs List 1, 101 Adhesive sheet with winding core 2, 102 Adhesive sheet 10, 110 Design layer 11 Base material layer 12 Design resin layer 12a Concavo-convex pattern 13 Adhesive layer 13a Concave shape 14 Foamed resin layer 16 Solid pattern layer 17 Pattern pattern layer 18 Surface protection Layer 20 Roll core 21 Roll core release layer 25 Release base sheet 130 Cell-containing composition

Claims (6)

A pressure-sensitive adhesive sheet with a core in which the pressure-sensitive adhesive sheet is wound and laminated on a core having a release layer on the surface,
In the adhesive sheet, an adhesive layer, a base material layer, and a design layer are laminated in this order,
The core release layer and the adhesive layer are in contact,
A pressure-sensitive adhesive sheet with a winding core, in which the design layer and the pressure-sensitive adhesive layer are in contact with each other by laminating the pressure-sensitive adhesive sheets. The pressure-sensitive adhesive sheet with a winding core according to claim 1, wherein the pressure-sensitive adhesive layer has a plurality of concave shapes on both sides thereof. The pressure-sensitive adhesive sheet with a winding core according to claim 2, wherein the concave shapes are evenly formed on both sides of the pressure-sensitive adhesive layer. The average value of the diameters of the concave openings that open on the surface on the base layer side is ^Dave ₁ , and the diameter of the concave openings that open on the surface opposite to the base layer When the average value of is D ^ave ₂ ,
_| ^Dave1 ₋ ^{Dave2 |} _/Dave2≦0.5
4. The pressure-sensitive adhesive sheet with a winding core according to claim 2 or 3, which satisfies the relationship of The pressure-sensitive adhesive sheet with core according to any one of claims 1 to 4, wherein the design layer includes at least one of a design resin layer and a surface protective layer. A step of preparing a winding core having a core release layer on the surface;
A step of preparing a release base sheet;
a step of applying a bubble-containing composition to the release base sheet;
a step of heating and drying the bubble-containing composition to form an adhesive layer;
a pressure-sensitive adhesive sheet having a releasable base sheet formed by joining the base layer-side surface of a laminate of a base layer and a design layer to the pressure-sensitive adhesive layer formed on the releasable base sheet; and
a step of peeling the release base sheet from the pressure-sensitive adhesive sheet having the release base sheet to obtain a pressure-sensitive adhesive sheet;
and winding the adhesive sheet around the core.

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