JP7219071B2 - Adhesive sheet - Google Patents

Description

The present invention relates to an adhesive sheet.

BACKGROUND ART Adhesive sheets to be adhered to adherends are used in various fields.
On the other hand, an adhesive tape has been developed in which microcapsules encapsulating perfume are dispersed in an adhesive layer (see, for example, Patent Document 1).

However, conventionally, no consideration has been given to the relationship between the adherend and the scent of perfume. As a result, the scent emitted from the adhesive tape may give a sense of discomfort.

JP 2008-069275 A

An object of the present invention is to provide a pressure-sensitive adhesive sheet in which the adherend is a container for containing contents, or a packaging material for packaging the contents or the container, and which can remind one of the contents.

Such objects are achieved by the present invention described in (1) to ( 3 ) below.
(1) A pressure-sensitive adhesive sheet having, as an adherend, a container containing contents or a packaging material for packaging the contents or the container,
a substrate made of paper having an air permeability of 0.5 μm/(Pa s) or more and 100 μm/(Pa s) or less; and an emulsion-type pressure-sensitive adhesive provided on one side of the substrate; and an adhesive layer containing microcapsules containing perfume ,
The combination of the content, the color exhibited by the adhesive sheet, and the scent emitted by the destruction of the microcapsules when the adhesive sheet is peeled off from the adherend is the following <1> to <4>. A pressure-sensitive adhesive sheet characterized by being any of the above .
<1> Contents: "Matcha, processed products containing matcha, or matcha-flavored foods", color: "green", scent: "matcha scent"
<2> Contents: “Lemon, processed product containing lemon, or lemon-flavored food”, Color: “Yellow”, Aroma: “Lemon scent”
<3> Contents: “strawberry, processed product containing strawberry, or strawberry-flavored food”, color: “red”, scent: “strawberry scent”
<4> Contents: “Banana, processed product containing banana, or banana-flavored food”, Color: “Yellow”, Aroma: “Banana scent”

( 2 ) The pressure-sensitive adhesive sheet according to (1) above, wherein the pressure-sensitive adhesive layer has an adhesive strength of 3 N/25 mm or more and 20 N/25 mm or less to the surface of the stainless steel plate.

( 3 ) The pressure-sensitive adhesive sheet according to (1) or (2) above, wherein the part of the adherend that contacts the pressure-sensitive adhesive layer is made of paper or plastic.

According to the present invention, it is possible to provide a pressure-sensitive adhesive sheet in which the adherend is a container containing contents, or a packaging material for packaging the contents or the container, and which can remind the user of the contents. .

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows typically 1st Embodiment of the adhesive sheet of this invention. FIG. 2 is a longitudinal sectional view schematically showing a mode of peeling the pressure-sensitive adhesive sheet shown in FIG. 1 from an adherend. Fig. 2 is a longitudinal sectional view schematically showing a second embodiment of the pressure-sensitive adhesive sheet of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive sheet of the present invention will be described below based on preferred embodiments shown in the accompanying drawings.
<<1st Embodiment>>
First, a first embodiment of the pressure-sensitive adhesive sheet of the present invention will be described.
<Adhesive sheet>
FIG. 1 is a longitudinal sectional view schematically showing a first embodiment of the pressure-sensitive adhesive sheet of the invention. FIG. 2 is a vertical cross-sectional view schematically showing a mode of peeling the pressure-sensitive adhesive sheet shown in FIG. 1 from an adherend.

The pressure-sensitive adhesive sheet 1 has an adherend 100 which is a container for containing contents or a packaging material for packaging the contents or the container. In other words, it is used by adhering to a container containing contents, or a packaging material for packaging the contents or the container.

As shown in FIG. 1 , adhesive sheet 1 has substrate 11 and adhesive layer 12 provided on second surface 112 , which is one surface of substrate 11 . The pressure-sensitive adhesive sheet 1 exhibits a color or pattern that reminds one of the contents, and is configured to emit a scent that reminds one of the contents when peeled from the adherend 100 .

With such a configuration, it is possible to provide the pressure-sensitive adhesive sheet 1 that can remind one of the contents. More specifically, when the pressure-sensitive adhesive sheet 1 is peeled off from the adherend 100, the visual effect and the olfactory effect act synergistically, and the adherend 100 such as a person who peels off the pressure-sensitive adhesive sheet 1. It is possible to give a psychological effect to a person in the vicinity (a person in a range where the scent of the perfume reaches) as if the scent of the contents were drifting. As a result, for example, a person who smells the fragrance has a higher expectation of the contents, or when the contents are food, the flavor and quality of the contents are higher for those who smell the fragrance. The commercial value of the contents and their packages (things in which the contents are packaged in containers or packaging materials) can be further enhanced, for example, by giving the impression that they are real goods. In addition, even when the scent of the perfume is relatively weak or when a synthetic perfume having a scent different from that of natural products is used, it is easy for the person who smells the perfume to recognize that it is a suitable scent.

In the present specification, food is a concept that includes liquids (drinks) in addition to solid foods and semi-solid foods (such as jellies). Moreover, the actual contents and the contents evoked by the color of the pressure-sensitive adhesive sheet 1 and the scent of the perfume may or may not match. In addition, before the adhesive sheet 1 is peeled off from the adherend 100, the type of the contents may or may not be identifiable from the appearance of the package.

In particular, in this embodiment, the adhesive layer 12 contains microcapsules 20 containing perfume in addition to the adhesive, and the microcapsules 20 are destroyed when the adhesive sheet 1 is peeled off from the adherend 100. is configured as More specifically, as shown in FIG. 2, the pressure-sensitive adhesive sheet 1 is pulled in the direction of arrow Y in FIG. becomes. At this time, the portion of the pressure-sensitive adhesive layer 12 immediately after being peeled from the adherend 100, that is, the peel tip portion 123 is deformed (particularly stretched). The pressure-sensitive adhesive sheet 1 is configured such that the stress due to the deformation of the pressure-sensitive adhesive layer 12 applies a tensile force to the microcapsules 20, destroys the microcapsules 20, and diffuses the perfume.

With such a configuration, at a time before the adhesive sheet 1 is peeled off from the adherend 100 (for example, when the adhesive sheet 1 is adhered to the adherend 100), the microcapsules 20 are unintentionally caused by the pressing force. It is possible to preferably prevent the adhesive sheet 1 from being destroyed, and to more preferably diffuse the perfume when the pressure-sensitive adhesive sheet 1 is peeled off from the adherend 100 .

Each configuration will be specifically described below. In this specification, the term "film" is used as a term including the concept of a sheet. Moreover, in this specification, the pressure-sensitive adhesive sheet is a concept including pressure-sensitive adhesive labels and pressure-sensitive adhesive tapes.

[Base material]
The substrate 11 is a single-layer body having a first surface 111 exposed to the surface when the adhesive sheet 1 is adhered to the adherend 100 and a second surface 112 facing the adhesive layer 12. . The base material 11 has a function of supporting the pressure-sensitive adhesive layer 12 and a function of identifying the adherend 100 by the coloring or pattern applied to the base material 1 .

As the substrate 11, for example, a plastic film, a metal film, a laminate thereof, or the like can be used, but it is preferable to use a paper substrate made of paper.

Paper substrates generally have excellent breathability.
Thereby, when peeling the pressure-sensitive adhesive sheet 1 from the adherend 100 , the perfume can pass through the paper substrate as the substrate 11 . Therefore, when peeling the adhesive sheet 1 from the adherend 100, the fragrance can be diffused from the side of the adhesive sheet 1 opposite to the side of the adhesive layer 12, that is, from the substrate 11 side.

Examples of the paper substrate include various types of Japanese paper, Western paper, and the like. For example, paper substrates include wrapping paper such as kraft paper, non-coated paper such as fine paper, medium-quality paper, and glassine paper, coated paper such as coated paper and art paper, and mixtures of wood fibers and other fibers. It may be a mixed paper made by hand.

At least one of the first surface 111 and the second surface 112 of the base material 11 may be subjected to surface treatment or the like.

Examples of such surface treatment include surface roughening treatment, hydrophilization treatment, water repellent treatment, mold release treatment, and the like.

For example, the first surface 111 of the substrate 11 can be subjected to a silicone surface treatment as a release treatment.

This effectively prevents the first surface 111 of the substrate 11, i.e., the back surface, from sticking to the surface of the adhesive layer 12 and becoming difficult to separate when the adhesive sheet 1 is wound into a roll. can be done.

Although the thickness of the base material 11 is not particularly limited, it is preferably 15 μm or more and 300 μm or less, and more preferably 20 μm or more and 75 μm or less.

Thereby, the base material 11 can support the adhesive layer 12 suitably. In addition, when the base material 11 is made of paper (paper base material), it becomes easier for the perfume to pass through, and the pressure-sensitive adhesive sheet 1 as a whole can diffuse the perfume more efficiently.

As described above, the adhesive sheet 1 presents a color or pattern reminiscent of the content. Generally, when the adhesive sheet 1 is attached to the adherend 100, the appearance of the substrate 11 has a great influence on the appearance of the adhesive sheet 1 as a whole. Accordingly, substrate 11 typically presents a color or pattern that is reminiscent of the content.

When the material of the base material 11 itself has a color that reminds one of the contents, the material may be used as the base material 11 as it is. may be used. Thereby, it is possible to suitably obtain the base material 11 having a color or pattern that reminds one of the contents. The coloring agent may be contained in any form, for example, it may be applied by a printing method or a coating method, or may be dyed by an immersion method or the like. Further, for example, when the base material 11 is made of plastic, a coloring agent may be applied during kneading before molding the base material 11 .

In addition, when the substrate 11 exhibits a pattern reminiscent of the content, the pattern can be preferably formed by, for example, a printing method. can also be suitably formed.
As mentioned above, paper is breathable.

When paper is used as the substrate 11, the air permeability of the substrate 11 is not particularly limited, but is preferably 0.5 μm/(Pa·s) or more and 100 μm/(Pa·s) or less, and 10 μm/(Pa·s) or more. (Pa·s) or more and 30 µm/(Pa·s) or less is more preferable.
This allows the perfume to diffuse through the substrate 11 .

The air permeability is measured as ISO air permeability at 23° C. in accordance with JIS P8117-2009 (ISO 5636-5:2003). Further, for the measurement of the air permeability, for example, a Gurley standard type densometer (B type) can be used.

When paper is used as the substrate 11, the basis weight of the substrate 11 is preferably 30 g/m ² or more and 250 g/m ² or less, more preferably 50 g/m ² or more and 210 g/m ² or less. .

It can be said that such a base material 11 has appropriate rigidity. As a result, the adhesive sheet 1 can be attached to the adherend 100 and peeled off from the adherend 100 more easily. Furthermore, when the pressure-sensitive adhesive sheet 1 is peeled from the adherend 100, the substrate 11 is moderately bent, for example, in a curved shape as shown in FIG. can be done. As a result, destruction of the microcapsules 20 accompanying deformation of the pressure-sensitive adhesive layer 12 and diffusion of the perfume can be performed more efficiently.

[Adhesive layer]
As shown in FIGS. 1 and 2, the pressure-sensitive adhesive layer 12 has a first surface 121 facing the substrate 11 and a surface opposite to the first surface 121 (a surface in contact with the adherend 100). is a single layer body having a second surface 122 which is

The pressure-sensitive adhesive layer 12 is composed of a pressure-sensitive adhesive layer-forming composition. In particular, in this embodiment, the composition for forming an adhesive layer contains an adhesive and microcapsules 20 encapsulating perfume. Thus, the pressure-sensitive adhesive layer 12 has a function of exhibiting adhesive force and a function of holding or carrying the microcapsules 20 .

(adhesive)
The adhesive that constitutes the adhesive layer 12 may be of any type, but is preferably an emulsion-type adhesive.

By using an emulsion-type adhesive, the fragrance can be diffused more efficiently when the adhesive sheet 1 is peeled off from the adherend 100 . This is considered to be due to the following reasons. That is, when the pressure-sensitive adhesive sheet 1 is peeled from the adherend 100 , the pressure-sensitive adhesive layer 12 is stretched and deformed, and tensile stress is applied to the microcapsules 20 in the pressure-sensitive adhesive layer 12 . As a result, the microcapsules 20 are destroyed, and the perfume contained in the microcapsules 20 is released and dispersed. Here, in the deformed portion of the pressure-sensitive adhesive layer 12, there are gaps through which the perfume from the destroyed microcapsules 20 can pass. Such gaps are more likely to occur in the pressure-sensitive adhesive layer 12 made of the above emulsion-type pressure-sensitive adhesive than in the pressure-sensitive adhesive layer made of solvent-type pressure-sensitive adhesive or the like. More specifically, there is a surfactant in the portion corresponding to the interface of each particle constituting the emulsion, and there is a portion where each particle is not fused, so the above gaps are likely to occur. . Therefore, the fragrance can be diffused more efficiently through the gap. In particular, even when the thickness of the adhesive layer 12 is relatively thick, the above gaps can be preferably formed, and the surface (second surface 122) side of the adhesive layer 12 and the base material The perfume can be efficiently diffused from the surface of 11 (first surface 111).

Examples of the emulsion-type adhesive that constitutes the adhesive layer 12 include a thermoplastic resin-based adhesive, a thermosetting resin-based adhesive, an elastomer-based adhesive, and the like.

More specifically, such adhesives include acrylic adhesives, vinyl acetate adhesives, ethylene vinyl acetate copolymer adhesives, urethane adhesives, synthetic rubber adhesives, and silicone adhesives. agents and the like.

Among these, acrylic pressure-sensitive adhesives and urethane-based pressure-sensitive adhesives are preferably used, and acrylic pressure-sensitive adhesives are more preferably used, from the viewpoints of adhesion to microcapsules 20 and weather resistance, which will be described in detail later.

Specific examples of acrylic adhesives include copolymers of alkyl acrylate esters such as butyl acrylate, 2-ethylhexyl acrylate and methyl acrylate.

The content of the adhesive in the adhesive layer 12 is preferably 40% by mass or more and 99% by mass or less, more preferably 60% by mass or more and 95% by mass or less.

As a result, while the adhesive force of the adhesive layer 12 is maintained at an appropriate level, the microcapsules 20 are destroyed and the perfume is released due to the deformation (especially elongation) of the adhesive layer 12 when the adhesive sheet 1 is peeled off from the adherend 100. is done more efficiently.

(microcapsule)
The microcapsules 20 are not broken by pressure deformation at the time of manufacturing and sticking the adhesive sheet 1, and when the adhesive sheet 1 is peeled off from the adherend 100, the adhesive layer 12 is deformed (especially elongated). configured to be destroyed. The configuration of the microcapsule 20 will be specifically described below.

The microcapsule 20 is composed of a core portion (nucleus, core) containing perfume and a shell portion (wall portion, shell) containing a resin material. It can also be said that the perfume is the core substance and the resin material is the wall substance. That is, the microcapsules 20 are microencapsulated structures in which a core substance is covered with a wall substance.

Perfumes may be in solid, liquid or gaseous form, preferably in liquid form. As a result, microencapsulation can be easily performed, and when the microcapsules 20 are destroyed due to the deformation (especially elongation) of the adhesive layer 12 when the adhesive sheet 1 is peeled from the adherend 100 The perfume diffuses more efficiently by permeating into the paper substrate through the gaps between the emulsion particles forming the pressure-sensitive adhesive layer and volatilizing in the paper substrate.

The type of fragrance is not particularly limited, and examples include citrus fruits such as oranges, mandarin oranges, lemons, and grapefruits; fruits such as grapes, melons, apples, kiwifruits, bananas, pineapples, peaches, and strawberries; green tea (including matcha); Foods such as teas such as black tea, spices; those corresponding to the fragrances of flowers such as lavender, roses, fragrant roses, cherry blossoms, etc., and may be natural fragrances or synthetic fragrances. Note that the scent of the perfume may be one that reminds one of the content, and may not be the same scent as the content.

Examples of the resin material forming the shell include various resin materials such as melamine-based resin, polyurethane-based resin, urea-based resin, polyurea-based resin, polyurethaneurea-based resin, polyamide-based resin, and polyester-based resin. Among them, urethane-based resins and melamine-based resins are preferred, and melamine-based resins are more preferred.

As a result, the strength of the shell of the microcapsules 20 can be made more suitable, and the binding force between the shell of the microcapsules 20 and the adhesive (especially emulsion-type adhesive) can be improved. can be done. As a result, for example, when the adhesive sheet 1 is manufactured or when the adhesive sheet 1 is attached to the adherend 100, other than when the adhesive sheet 1 is peeled off from the adherend 100, the microcapsules 20 are unintentionally released. To efficiently transmit the stress associated with the deformation (especially elongation) of the adhesive layer 12 to the microcapsules 20 when the adhesive sheet 1 is peeled from the adherend 100 while preventing the shell from breaking. It is possible to more effectively prevent interfacial peeling between the microcapsules 20 and the adhesive, and to more efficiently destroy the microcapsules 20 and release the fragrance.

The film thickness of the shell is not particularly limited, but is preferably 10 nm or more and 800 nm or less, more preferably 50 nm or more and 500 nm or less.

As a result, the strength of the shell of the microcapsules 20 can be made more suitable, and the binding force between the shell of the microcapsules 20 and the adhesive (especially emulsion-type adhesive) can be improved. can be done. As a result, for example, except when the adhesive sheet 1 is peeled off from the adherend 100, the shell of the microcapsules 20 is prevented from being unintentionally destroyed, while the adhesive sheet 1 is removed from the adherend 100. At the time of peeling, the destruction of the microcapsules 20 and the diffusion of the fragrance can be performed more efficiently.

Although the average particle size of the microcapsules 20 is not particularly limited, it is preferably 0.5 μm or more and 10 μm or less, and more preferably 1.0 μm or more and 7 μm or less.

As a result, the strength of the shell of the microcapsules 20 can be made more suitable, and the binding force between the shell of the microcapsules 20 and the adhesive (especially emulsion-type adhesive) can be improved. can be done. As a result, for example, except when the adhesive sheet 1 is peeled off from the adherend 100, the shell of the microcapsules 20 is prevented from being unintentionally destroyed, while the adhesive sheet 1 is removed from the adherend 100. At the time of peeling, the destruction of the microcapsules 20 and the diffusion of the fragrance can be performed more efficiently.

As used herein, the term "average particle size" means a value obtained by particle size distribution measurement using the Coulter method.

The microcapsules 20 described above can be produced by, for example, a coacervation method, an in-situ polymerization method, an interfacial polymerization method, or the like.

The content of the microcapsules 20 in the adhesive layer 12 is preferably 1% by mass or more and 50% by mass or less, more preferably 5% by mass or more and 35% by mass or less.

As a result, the content of the adhesive in the adhesive layer 12 can be set to a suitable value, and the adhesive force of the adhesive layer 12 can be appropriately maintained, and the pressure-sensitive adhesive sheet 1 can be peeled off from the adherend 100. Destruction of the microcapsules 20 accompanying deformation (especially elongation) of the pressure-sensitive adhesive layer 12 and diffusion of the perfume are more efficiently performed.

In the configuration shown, the microcapsules 20 are evenly dispersed throughout the adhesive layer 12 . That is, the microcapsules 20 are uniformly dispersed in the surface direction and thickness direction of the pressure-sensitive adhesive layer 12 . Therefore, the pressure-sensitive adhesive layer 12 can be easily obtained by mixing the pressure-sensitive adhesive and the microcapsules 20 to obtain a composition for forming a pressure-sensitive adhesive layer, and layering this composition.

The microcapsules 20 may be unevenly distributed on at least one side of the pressure-sensitive adhesive layer 12, or may be unevenly distributed in the middle of the pressure-sensitive adhesive layer 12 in the thickness direction. For example, the microcapsules 20 may be unevenly distributed in the middle of the adhesive layer 12 in the thickness direction. Moreover, the microcapsules 20 may be unevenly distributed in a part of the surface direction of the pressure-sensitive adhesive layer 12 .

The adhesive layer 12 should just contain an adhesive and the microcapsule 20, and may contain the components other than these. Such components include, for example, cross-linking agents, tackifiers, fillers, antioxidants, softeners, UV absorbers, light stabilizers, colorants, modifiers, rust inhibitors, flame retardants, hydrolysis Inhibitors, surface lubricants, corrosion inhibitors, heat stabilizers, lubricants, primers, antistatic agents, polymerization inhibitors, catalysts, leveling agents, thickeners, dispersants, antifoaming agents and the like.

Examples of the cross-linking agent include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, aziridine-based cross-linking agents, metal chelate-based cross-linking agents, amine-based cross-linking agents, and amino resin-based cross-linking agents. Or you may use in combination of 2 or more types.

Examples of tackifiers include rosin resins, terpene phenol resins, terpene resins, aromatic hydrocarbon-modified terpene resins, petroleum resins, coumarone-indene resins, styrene resins, phenol resins, and xylene resins.

Examples of fillers include zinc white, titanium oxide, silica, calcium carbonate, barium sulfate and the like.
Softening agents include, for example, process oils, liquid rubbers, plasticizers, and the like.

Examples of antioxidants include anilide antioxidants, phenol antioxidants, thioester antioxidants, and the like.

Although the thickness of the adhesive layer 12 is not particularly limited, it is preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 60 μm or less.

As a result, a sufficient amount of microcapsules 20 can be contained while obtaining more suitable adhesive strength, and the adhesive sheet 1 can be attached to the adherend 100 and the adhesive sheet 1 can be removed from the adherend 100. Peeling can be performed more suitably.

When the thickness of the base material 11 is T ₁ [μm] and the thickness of the pressure-sensitive adhesive layer 12 is T ₂ [μm], it is preferable to satisfy the relationship 1<T ₁ /T ₂ and 1.5< It is more preferable to satisfy the relationship T ₁ /T ₂ <3.

As a result, the substrate 11 reliably supports the pressure-sensitive adhesive layer 12, and bending or bending of the substrate 11 and deformation of the pressure-sensitive adhesive layer 12 can be performed more favorably. As a result, the effects described above can be exhibited more remarkably.

The adhesive strength of the adhesive layer 12 to the surface of the stainless steel plate is preferably 3 N/25 mm or more and 20 N/25 mm or less, more preferably 5 N/25 mm or more and 18 N/25 mm or less.

As a result, in general, while being attached to various adherends 100, it is more effectively prevented from being unintentionally peeled off from the adherend 100, and at the time of peeling from the adherend 100 , the adhesive layer 12 can be suitably stretched, the microcapsules 20 can be broken more effectively, and the perfume can be diffused more efficiently.

In addition, the said adhesive force can be measured based on JISZ0237:2009 in 23 degreeC.

The constituent material of the adherend 100 to which the adhesive sheet 1 is adhered is not particularly limited, but the surface of the adherend 100 (the part that contacts the adhesive layer 12) is made of paper, glass, metal or plastic. Preferably, it should be

As a result, when the pressure-sensitive adhesive sheet 1 is peeled off from the adherend 100, the microcapsules 20 can be destroyed more reliably, and the fragrance can be diffused more favorably.

Examples of plastics as a constituent material of the adherend 100 include polyesters such as polyethylene terephthalate, and polyolefins such as polyethylene and polypropylene.

Although the color of the adherend 100 is not particularly limited, it is preferably a color that reminds one of the contents.

As a result, for example, a person in the vicinity of the adherend 100, such as a person peeling off the adhesive sheet 1 (a person within a range where the scent of the perfume can reach), is psychologically as if the scent of the content is drifting. effect can be given more effectively. In addition, even when the fragrance of the fragrance is relatively weak or when a synthetic fragrance having a fragrance different from that of a natural product is used, the effect of making the person who smells the fragrance recognize that it is a suitable fragrance is more effective. prominently displayed.

Examples of the container for containing the contents include various boxes, bags, cans, bottles, and the like.
Examples of the packaging material for packaging the content or the container include wrapping paper and wrapping film.

As described above, the pressure-sensitive adhesive sheet 1 may have a color or pattern reminiscent of the content, and may emit a scent reminiscent of the content when peeled from the adherend 100. As a combination of the content and the appearance and aroma of the adhesive sheet 1, for example, the content is lemon, a processed product containing lemon, or a lemon-flavored food, and the adhesive sheet 1 is yellow. and a combination that emits a scent reminiscent of lemon when peeled from the adherend 100, the content is strawberry, a processed product containing strawberry, or a strawberry-flavored food, and the adhesive sheet 1 is a combination that exhibits a red color and emits a scent reminiscent of strawberries when peeled from the adherend 100, and the content is a banana, a processed product containing banana, or a banana-flavored food and the pressure-sensitive adhesive sheet 1 exhibits a yellow color and emits a scent reminiscent of banana when peeled from the adherend 100. As an example of a preferred combination, the content is matcha, a processed product containing matcha, or a matcha-flavored food, and the adhesive sheet 1 exhibits a green color and emits a scent reminiscent of matcha when peeled from the adherend 100. A combination is mentioned.
As a result, the effects of the present invention as described above are exhibited more remarkably.

In this case, the color of the pressure-sensitive adhesive sheet 1 preferably has a hue of Y to BG (an area including Y, GY, G and BG), more preferably GY to G, in the Munsell display system.

The pressure-sensitive adhesive sheet 1 described above can favorably diffuse perfume when peeled from the adherend 100 .

<Aspect at the time of peeling of the pressure-sensitive adhesive sheet from the adherend>
Next, the mode of peeling the pressure-sensitive adhesive sheet of the present invention from the adherend will be described.
FIG. 2 is a vertical cross-sectional view schematically showing a mode of peeling the pressure-sensitive adhesive sheet shown in FIG. 1 from an adherend.

In FIG. 2, the pressure-sensitive adhesive sheet 1 is attached to the adherend 100 with the pressure-sensitive adhesive layer 12, and is tilted at 90 degrees to the surface of the adherend 100 (the direction indicated by the arrow Y in FIG. 2). The pressure-sensitive adhesive layer 12 is peeled from the adherend 100 by being pulled.

During this peeling, the portion of the pressure-sensitive adhesive layer 12 immediately after peeling, that is, the peel tip portion 123 is particularly deformed. When the adhesive sheet 1 is viewed toward the paper surface of FIG. 2, the peel tip portion 123 is greatly elongated. Stress is applied to the microcapsules 20 in the vicinity of the exfoliation tip 123 of the adhesive layer 12 as the adhesive layer 12 expands. Due to this stress, the microcapsules 20 are broken, and the perfume contained in the microcapsules 20 is released.

In addition, when the adhesive layer 12 is made of a material containing an emulsion-type adhesive, at the peeling tip 123, gaps such as cracks through which the fragrance from the broken microcapsules 20 can pass are adhered. It preferably occurs in the agent layer 12 . The perfume contained in the microcapsules 20 is efficiently diffused through this gap.

Furthermore, the adhesive layer 12 is supported by the substrate 11 . Therefore, when the base material 11 is a paper base material, when the adhesive layer 12 is deformed and the microcapsules 20 are destroyed, the perfume contained in the microcapsules 20 is diffused through the base material 11 as well. be done. In other words, the perfume encapsulated in the microcapsules 20 is diffused toward the second surface 122 side of the adhesive layer 12 and directed toward the first surface 111 side of the base material 11 through the base material 11. dissipated through

From the state shown in FIG. 2, the adhesive sheet 1 is peeled off from the adherend 100 (direction indicated by arrow Y in FIG. 2, 90° direction with respect to the surface of the adherend 100). When pulled further, the pressure-sensitive adhesive layer 12 is further peeled from the adherend 100 . As a result, the pressure-sensitive adhesive layer 12 is further deformed (especially elongated) so that the peeling tip 123 of the pressure-sensitive adhesive layer 12 moves in the direction of the arrow X in FIG. In this way, the destruction of the microcapsules 20 and the diffusion of the fragrance along with the deformation (especially elongation) of the peeling tip 123 can be achieved in the entire adhesive layer 12 .

The radius of curvature R of the curved portion 113 of the substrate 11 when the adhesive sheet 1 is peeled from the adherend 100 is preferably 3 mm or more and 50 mm or less, more preferably 5 mm or more and 30 mm or less.

As a result, the pressure-sensitive adhesive layer 12 can be sufficiently deformed, and the breakage of the microcapsules 20 and the diffusion of the fragrance accompanying the deformation of the pressure-sensitive adhesive layer 12 can be performed particularly efficiently.

<<Second embodiment>>
Next, a second embodiment of the pressure-sensitive adhesive sheet of the present invention will be described.
FIG. 3 is a longitudinal sectional view schematically showing a second embodiment of the pressure-sensitive adhesive sheet of the invention.

Hereinafter, the pressure-sensitive adhesive sheet 1 of the second embodiment will be described with a focus on the differences from the pressure-sensitive adhesive sheet 1 of the first embodiment, and the description of the same matters will be omitted.

The pressure-sensitive adhesive sheet 1 of this embodiment further includes a release liner 13 covering the second surface 122 of the pressure-sensitive adhesive layer 12, and is otherwise the same as the embodiment described above.

The release liner 13 has a function of collectively supporting a plurality of pressure-sensitive adhesive sheets that have been die-cut and separated into individual labels.

As for the release liner 13, for example, the surface in contact with the adhesive layer 12 is made of silicone, and the adhesive sheet can be released.

According to such an adhesive sheet 1, the adhesive sheet 1 can be stored and transported as a sheet. Therefore, handling of the adhesive sheet 1 becomes easy. Needless to say, such an adhesive sheet 1 can also exhibit the effects described above.

The pressure-sensitive adhesive sheet 1 of the present embodiment can also be produced, for example, by forming the pressure-sensitive adhesive layer 12 on the release liner 13 and then bonding the substrate 11 onto the first surface 121 of the pressure-sensitive adhesive layer 12. can. The microcapsules 20 in the pressure-sensitive adhesive layer 12 are not broken even during this production. That is, when the substrate 11 is further attached to the adhesive layer 12 formed on the release liner 13, the substrate 11 is pressed against the adhesive layer 12. Microcapsules 20 in layer 12 are not destroyed. It is considered that this is also influenced by the fact that the pressure-sensitive adhesive exerts a cushioning property. This pressing force is usually in the range of 100 N/m or more and 2000 N/m or less.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these.

For example, the pressure-sensitive adhesive sheet according to the present invention may have at least one intermediate layer between the substrate and the pressure-sensitive adhesive layer.

In addition, the pressure-sensitive adhesive sheet according to the present invention may have at least one coating layer on the surface (first surface) opposite to the surface facing the pressure-sensitive adhesive layer of the substrate. For example, a printed layer may be provided on the first surface side of the substrate. Also, a coat layer may be provided on the surface of the adhesive layer opposite to the substrate (the surface of the adhesive sheet). Furthermore, the pressure-sensitive adhesive sheet according to the present invention may be configured to be used as a pressure-sensitive adhesive tape or a double-sided pressure-sensitive adhesive tape.

Further, in the above-described embodiments, the case where the pressure-sensitive adhesive layer contains microcapsules containing perfume has been described as a representative example, but in the present invention, when the pressure-sensitive adhesive sheet is peeled from the adherend, It is not limited to the configuration in which the fragrance is contained in microcapsules as long as it is configured to emit a scent that reminds you of.

In addition, in the above-described embodiments, the case where the base material presents a color or pattern reminiscent of the contents has been mainly described, but the pressure-sensitive adhesive layer presents a color or pattern reminiscent of the contents may be In particular, such a configuration is suitable when the base material is transparent, or when the adherend is transparent and the pressure-sensitive adhesive sheet is visible through the adherend. can be adopted for

Further, in the above-described embodiments, the case where the base material is a single-layer body has been described as a representative example, but the base material may be a laminate having a plurality of layers.

Moreover, in the above-described embodiments, the case where the pressure-sensitive adhesive layer is a single layer has been described as a representative example, but the pressure-sensitive adhesive layer may be a laminate having a plurality of layers.

REFERENCE SIGNS LIST 1 Adhesive sheet 11 Base material 111 First surface 112 Second surface 113 Curved portion 12 Adhesive layer 121 First surface 122 Second surface 123 Release tip 13 Release liner 20 Microcapsules 100 adherend R curvature radius X arrow Y arrow

Claims (3)

A pressure-sensitive adhesive sheet having, as an adherend, a container containing contents or a packaging material for packaging the contents or the container,
a substrate made of paper having an air permeability of 0.5 μm/(Pa s) or more and 100 μm/(Pa s) or less; and an emulsion-type pressure-sensitive adhesive provided on one side of the substrate; and an adhesive layer containing microcapsules containing perfume ,
The combination of the content, the color exhibited by the adhesive sheet, and the scent emitted by the destruction of the microcapsules when the adhesive sheet is peeled off from the adherend is the following <1> to <4>. A pressure-sensitive adhesive sheet characterized by being any of the above .
<1> Contents: "Matcha, processed products containing matcha, or matcha-flavored foods", color: "green", scent: "matcha scent"
<2> Contents: “Lemon, processed product containing lemon, or lemon-flavored food”, Color: “Yellow”, Aroma: “Lemon scent”
<3> Contents: “strawberry, processed product containing strawberry, or strawberry-flavored food”, color: “red”, scent: “strawberry scent”
<4> Contents: “Banana, processed product containing banana, or banana-flavored food”, Color: “Yellow”, Aroma: “Banana scent” The pressure-sensitive adhesive sheet according to claim 1 , wherein the pressure-sensitive adhesive layer has an adhesive strength of 3 N/25 mm or more and 20 N/25 mm or less to the surface of the stainless steel plate. 3. The pressure-sensitive adhesive sheet according to claim 1, wherein the adherend is made of paper or plastic at a portion that contacts the pressure-sensitive adhesive layer.

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