JP2019052279A - Adhesive sheet - Google Patents

Abstract

To provide an adhesive sheet which has high safety to a human body, and can be used as an identification label that is difficult to be peeled depending on environment at the time of use and impact.SOLUTION: An adhesive sheet has a base material and an adhesive layer, and is used by sticking adhesive surfaces of the adhesive layer, where the adhesive layer is a layer formed from an adhesive composition containing one or more styrene resins (A) selected from a styrene-isoprene diblock copolymer (SI) and a styrene-isoprene-styrene triblock copolymer (SIS), and one or more tackifier resins (B) selected from a non-hydrogenated terpene resin and a rosin resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an adhesive sheet.

The pressure-sensitive adhesive sheet is used not only for joining members but also as various identification labels.
For example, Patent Literature 1 discloses a hospital identification bracelet used in a hospital to which patient identification information such as a sample collected for analysis related to a patient, a medicine, a diagnostic file, and a medical history is given. ing.
The hospital identification bracelet described in Patent Document 1 includes a plurality of adhesive labels printed with a code or printable codes, and a flexible strip, and the adhesive strip of the adhesive label has a flexible strip. By attaching to the back of the patient, it can be worn on the patient's wrist or the like.

Special table 2012-528370 gazette

By the way, various identification labels such as the hospital identification bracelet described in Patent Document 1 are peeled off due to a decrease in the adhesive force of the adhesive surface due to patient movement, body temperature, and sweating when the patient's wrist is worn. There is a case.
Here, it is conceivable to form the adhesive surface of the identification label from a high adhesive, but some components contained in such a high adhesive may cause allergies to the human body.
Further, not only the identification label attached to the wrist of the human body but also the identification label attached to the handle of the suitcase at the airport, for example, is required not to be peeled off due to the environment or impact during transportation.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pressure-sensitive adhesive sheet that has high safety to the human body and can be used as an identification label that does not easily peel off due to environment or impact during use.

  In the pressure-sensitive adhesive sheet that is used by bonding the pressure-sensitive adhesive surfaces together, the present inventors provide one or more tackifying resins (B) selected from a specific styrene resin, a non-hydrogenated terpene resin, and a rosin resin. It was found that the above-mentioned problems could be solved by using a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition contained therein, and the present invention was completed.

That is, the present invention provides the following [1] to [13].
[1] A pressure-sensitive adhesive sheet having a base material and a pressure-sensitive adhesive layer, which is used by bonding the pressure-sensitive adhesive surfaces of the pressure-sensitive adhesive layer,
The pressure-sensitive adhesive layer is one or more styrene resins (A) selected from styrene-isoprene diblock copolymer (SI) and styrene-isoprene-styrene triblock copolymer (SIS), and non-hydrogenated The adhesive sheet which is a layer formed from the adhesive composition containing 1 or more types of tackifying resin (B) chosen from terpene resin and rosin resin.
[2] The pressure-sensitive adhesive sheet according to the above [1], which has a configuration in which a pressure-sensitive adhesive layer is laminated on a part of the surface of the substrate.
[3] The pressure-sensitive adhesive sheet according to the above [2], wherein there are two or more pressure-sensitive adhesive layers laminated on a part of the surface of the substrate.
[4] The pressure-sensitive adhesive sheet according to the above [1], wherein a part of the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer is exposed at two or more locations or can be expressed at two or more locations.
[5] Any of [1] to [4] above, wherein the total content of components (A) and (B) is 90 to 100% by mass relative to the total amount of active ingredients of the pressure-sensitive adhesive composition. The pressure-sensitive adhesive sheet according to one item.
[6] Any of [1] to [5] above, wherein the content of component (B) is 30 to 200 parts by mass with respect to 100 parts by mass of the total amount of component (A) in the pressure-sensitive adhesive composition. The pressure-sensitive adhesive sheet according to claim 1.
[7] The content of the structural unit derived from styrene with respect to the total amount of the structural unit of the styrenic resin (A) is 5 to 40% by mass, according to any one of the above [1] to [6]. Adhesive sheet.
[8] Any one of [1] to [7] above, wherein the content of the styrene-isoprene diblock copolymer (SI) is 10 to 90% by mass with respect to the total amount of the styrene resin (A). The pressure-sensitive adhesive sheet described in 1.
[9] The pressure-sensitive adhesive sheet according to any one of [1] to [8], wherein the softening point of the tackifying resin (B) is 70 to 140 ° C.
[10] The pressure-sensitive adhesive sheet according to any one of [1] to [9], wherein the pressure-sensitive adhesive layer has a thickness of 30 to 150 μm.
[11] The pressure-sensitive adhesive sheet according to any one of [1] to [10], wherein the base material has a bending resistance of 0.10 to 0.45 mN.
[12] In any one of the above [1] to [11], wherein the base material is a resin film including one or more kinds of resins selected from polyester resins and polyolefin resins and having a cavity-containing layer. The adhesive sheet as described.
[13] The pressure-sensitive adhesive sheet according to any one of the above [1] to [12], which is used as an identification label by being wound around a handle portion or around a wrist or an ankle of a human or an animal.

  The pressure-sensitive adhesive sheet of the present invention is highly safe to the human body, hardly peels off due to the environment or impact during use, and can be suitably used as an identification label.

It is a cross-sectional schematic diagram of the adhesive sheet of a 1st aspect which shows an example of a structure of the adhesive sheet of this invention. It is a cross-sectional schematic diagram of the adhesive sheet of a 2nd aspect which shows an example of a structure of the adhesive sheet of this invention. It is a cross-sectional schematic diagram of the adhesive sheet of a 3rd aspect which shows an example of a structure of the adhesive sheet of this invention. It is a cross-sectional schematic diagram of the adhesive sheet of a 4th aspect which shows an example of a structure of the adhesive sheet of this invention.

  In the present specification, “mass average molecular weight (Mw)” is a value in terms of standard polystyrene measured by gel permeation chromatography (GPC), and specifically measured based on the method described in Examples. It is the value.

[Configuration of adhesive sheet]
The pressure-sensitive adhesive sheet of the present invention has a base material and a pressure-sensitive adhesive layer, but may have other layers, for example, a structure in which a release material is further laminated on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer. May be.
In the pressure-sensitive adhesive sheet of one embodiment of the present invention, the base material and the pressure-sensitive adhesive layer may be directly laminated, or the base material and the pressure-sensitive adhesive layer may have other layers. Good.

FIGS. 1-4 is a cross-sectional schematic diagram of the adhesive sheet of the 1st-4th aspect which shows an example of a structure of the adhesive sheet of this invention.
The pressure-sensitive adhesive sheet of one embodiment of the present invention is preferably a pressure-sensitive adhesive sheet having a configuration in which a pressure-sensitive adhesive layer is laminated on a part of the surface of the substrate, and two or more pressure-sensitive adhesive layers laminated on a part of the surface of the substrate. An existing pressure sensitive adhesive sheet is more preferable.
As an adhesive sheet of such an aspect, the adhesive sheet of the 1st aspect of FIG. 1 and the adhesive sheet of the 2nd aspect of FIG. 2 are mentioned.

In addition, as the pressure-sensitive adhesive sheet of another aspect of the present invention, a pressure-sensitive adhesive sheet in which a part of the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer is exposed at two or more locations or can be expressed at two or more locations. . In the pressure-sensitive adhesive sheet of this aspect, the pressure-sensitive adhesive surfaces that are exposed or exposed are bonded to each other.
As an adhesive sheet of such an aspect, the adhesive sheet of the 3rd aspect of FIG. 3 and the adhesive sheet of the 4th aspect of FIG. 4 are mentioned.
Hereinafter, the adhesive sheet of the 1st-4th aspect described in FIGS. 1-4 is demonstrated.

(First aspect of the pressure-sensitive adhesive sheet of the present invention)
A pressure-sensitive adhesive sheet 1 </ b> A shown in FIG. 1A, which is the first aspect of the present invention, has a first pressure-sensitive adhesive layer 21 and a second pressure-sensitive adhesive layer 22 laminated on both ends of one surface 10 b of a substrate 10. It has a configuration.
The pressure-sensitive adhesive sheet 1 </ b> A shown in FIG. 1A is used by bonding the pressure-sensitive adhesive surface 21 a of the first pressure-sensitive adhesive layer 21 and the pressure-sensitive adhesive surface 22 a of the second pressure-sensitive adhesive layer 22. Here, when the adhesive surfaces of the two adhesive layers are bonded to each other, the surface 10b of the substrate 10 is on the inside, and the surface 10a is on the outside.
For example, when the pressure-sensitive adhesive sheet 1A is attached to a handle portion of a luggage or a wrist of a human body, the pressure-sensitive adhesive sheet 1A has a structure in which an adhesive layer is laminated on a part of the surface 10b of the base material 10; The surface 10b of the base material 10 is in contact with the wrist or the like.
Here, when the pressure-sensitive adhesive surfaces of the two pressure-sensitive adhesive layers of the pressure-sensitive adhesive sheet 1A are bonded to each other, there is no pressure-sensitive adhesive surface on the surface 10b side of the base material. Contamination to parts and wrists of the human body can be prevented.

  In addition, when using 1 A of adhesive sheets as an identification label, it is preferable that the various information for identification is described in the surface 10a of the base material 10, or can be described.

Moreover, in the adhesive sheet of 1 aspect of this invention, like the adhesive sheet 1B shown in FIG.1 (b), further on the adhesive surface of the 1st adhesive layer 21 and the 2nd adhesive layer 22, the peeling material 31, It is good also as a structure which 32 laminated | stacked.
In addition, in the adhesive sheet 1B shown in FIG.1 (b), although it is the structure which has the two peeling materials 31 and 32, one peeling material is adhesion of the 1st adhesive layer 21 and the 2nd adhesive layer 22. FIG. The structure laminated | stacked on the surface may be sufficient.

(Second embodiment of the pressure-sensitive adhesive sheet of the present invention)
In the pressure-sensitive adhesive sheet 2A shown in FIG. 2A, which is the second aspect of the present invention, the first pressure-sensitive adhesive layer 21 is laminated on one end of one surface 10a of the base material 10, and the first surface 10b of the other surface 10b. It has a configuration in which a second pressure-sensitive adhesive layer 22 is laminated on one end opposite to the pressure-sensitive adhesive layer 21 side.
The pressure-sensitive adhesive sheet 2 </ b> A is also used by bonding the pressure-sensitive adhesive surface 21 a of the first pressure-sensitive adhesive layer 21 and the pressure-sensitive adhesive surface 22 a of the second pressure-sensitive adhesive layer 22.

In addition, when bonding the adhesion surface 21a and the adhesion surface 22a, the adhesion surfaces of two adhesive layers may also be bonded so that the surface 10a of the base material 10 may be located outside by the method of bonding. Moreover, the adhesive surfaces of two adhesive layers can also be bonded together so that the surface 10b is located outside.
Therefore, when the adhesive sheet 2A is used as an identification label, it is preferable that various information for identification is described or can be described on at least one surface of the substrate 10.

Further, in the pressure-sensitive adhesive sheet 2 </ b> A, various kinds of different information for identification may be described or can be described on the surface 10 a and the surface 10 b of the base material 10.
In the case of the pressure-sensitive adhesive sheet 2A having such a configuration, the surface of the base material 10 positioned on the outside can be changed by selecting a method of bonding between the pressure-sensitive adhesive surfaces. Information can be displayed on the outside.

  In addition, also in the adhesive sheet 2A of FIG. 2A, a release material is further provided on the adhesive surfaces of the first adhesive layer 21 and the second adhesive layer 22 as in the adhesive sheet 2B shown in FIG. It is good also as a structure which 31 and 32 laminated | stacked.

(Third aspect of the pressure-sensitive adhesive sheet of the present invention)
In the pressure-sensitive adhesive sheet 3 shown in FIG. 3A, which is the third aspect of the present invention, the base material 10, the pressure-sensitive adhesive layer 20, and the release material 30 are laminated in this order, and the release material 30 is the cut portion X1. , X2 is included.
The notches X1 and X2 of the release material 30 are provided so that the release material ends 301 and 302 at both ends of the release material 30 can be removed.

FIG. 3B is a schematic cross-sectional view of the pressure-sensitive adhesive sheet 3 showing a state after removing the release material end portions 301 and 302 along the cut portions X1 and X2, respectively.
As shown in FIG.3 (b), the adhesive sheet 3 is a part of adhesive surface of the adhesive layer 20 by removing the peeling material edge parts 301 and 302 along the notch parts X1 and X2, respectively. Two adhesive surfaces 201a and 202a can be exposed.

The pressure-sensitive adhesive sheet 3 shown in FIG. 3 is used by bonding the pressure-sensitive adhesive surface 201a and the pressure-sensitive adhesive surface 202a that are exposed after removing the release material end portions 301 and 302, respectively.
In this adhesive sheet 3, since two adhesive surfaces are bonded together so that the surface 10a of the base material 10 is located outside, various information for identification is described on the surface 10a of the base material 10 or Preferably it can be described.
Moreover, when the adhesive surfaces which the adhesive sheet 3 exposed are pasted together, the peeling material 30 is located inside. Therefore, when the adhesive sheet 3 is attached to the handle portion of the luggage or the wrist of the human body, it is possible to prevent contamination of the handle portion of the luggage or the wrist of the human body due to the adhesion of the adhesive layer.

(4th aspect of the adhesive sheet of this invention)
The pressure-sensitive adhesive sheet 4 shown in FIG. 4, which is the fourth aspect of the present invention, has a base material 10, a pressure-sensitive adhesive layer 20, and a non-adhesive layer 40, and a non-adhesive surface of the pressure-sensitive adhesive layer 20 is partially non-adhesive. The pressure-sensitive adhesive layer is laminated, and two pressure-sensitive adhesive surfaces 201a and 202a that are part of the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer 20 are exposed.
In addition, although the adhesive surfaces 201a and 202a have exposed, the adhesive sheet 4 shown in FIG. 4 is good also as an adhesive sheet of the structure which laminated | stacked the peeling material on these adhesive surfaces. In the pressure-sensitive adhesive sheet of this aspect, the pressure-sensitive adhesive surfaces 201a and 202a can be exposed by removing the release material.

The pressure-sensitive adhesive sheet 4 shown in FIG. 4 is used by bonding the exposed pressure-sensitive adhesive surface 201a and the pressure-sensitive adhesive surface 202a.
In this adhesive sheet 4, since two adhesive surfaces are bonded so that the surface 10a of the base material 10 is located outside, various information for identification is described on the surface 10a of the base material 10 or Preferably it can be described.
Moreover, when the adhesive surfaces which the adhesive sheet 4 exposed are pasted together, the non-adhesive layer 40 is located inside.
Since the surface of the non-adhesive layer 40 does not have adhesiveness, when the adhesive sheet 4 is attached to the handle portion of the luggage or the wrist of the human body, the adhesive layer adheres to the handle portion of the luggage or the human body. Contamination of the wrist etc. can be prevented.

(Preferable requirements for the pressure-sensitive adhesive sheet of one embodiment of the present invention)
In the pressure-sensitive adhesive sheet of one embodiment of the present invention, the shape of the pressure-sensitive adhesive layers of the pressure-sensitive adhesive layers to be bonded to each other is prevented from being contaminated by the pressure-sensitive adhesive surface after being attached to a handle portion of a luggage or the wrist of a human body. Are preferably substantially identical to each other.
For example, in the adhesive sheet 1A of FIG. 1A and the adhesive sheet 2A of FIG. 2B, the adhesive surface 21a of the first adhesive layer 21 and the adhesive surface 22a of the second adhesive layer 22 are mutually connected. It is preferable that they have substantially the same shape.
Further, in the pressure-sensitive adhesive sheet 3 in FIG. 3 and the pressure-sensitive adhesive sheet 4 in FIG. 4, it is preferable that the pressure-sensitive adhesive surface 201 a and the pressure-sensitive adhesive surface 202 a that are exposed or can be exposed have substantially the same shape.
In this specification, “when two target adhesive surfaces are overlapped, when the area ratio of a portion having a different shape with respect to 100% of the overlapping common portion area is less than 10%, the two adhesive surfaces It can be determined that the shape of the surface is substantially the same.

The pressure-sensitive adhesive sheet of the present invention has a high adhesive force between the pressure-sensitive adhesive surfaces when the pressure-sensitive adhesive layers are bonded to each other, so that the pressure-sensitive adhesive sheet is difficult to peel off due to the environment or impact during use and can be suitably used as an identification label.
In the pressure-sensitive adhesive sheet of one embodiment of the present invention, the adhesive force between the pressure-sensitive adhesive surfaces when the pressure-sensitive adhesive surfaces of the pressure-sensitive adhesive layer are bonded is preferably 25 N / 25 mm or more, more preferably 30 N / 25 mm or more, and still more preferably. It is 35 N / 25 mm or more, more preferably 40 N / 25 mm or more.
In addition, in this specification, said adhesive force of the adhesion surfaces means the value measured based on the method as described in an Example.
In addition, the adhesive strength is within the above range immediately after pasting the adhesive surfaces and after leaving the adhesive surfaces for 24 hours in an environment of 23 ° C. and 50% RH (relative humidity). Preferably there is.

In the pressure-sensitive adhesive sheet of one embodiment of the present invention, the adhesive strength to a stainless steel plate (SUS plate) is preferably 20 N / 25 mm or more, more preferably 25 N / 25 mm or more, still more preferably 30 N / 25 mm or more, and still more preferably 35 N. / 25 mm or more.
In addition, in this specification, said adhesive force means the value measured based on the method as described in an Example.
Hereinafter, the base material, the pressure-sensitive adhesive layer, the release agent layer, and the non-adhesive layer that constitute the pressure-sensitive adhesive sheet of one embodiment of the present invention will be described.

〔Base material〕
Although the base material which the adhesive sheet of this invention has is suitably selected according to a use, porous base materials, such as a paper base material, a metal base material, and a nonwoven fabric, a resin film etc. are mentioned, for example.

  Examples of the paper material constituting the paper base include thin paper, medium quality paper, high quality paper, impregnated paper, coated paper, art paper, sulfuric acid paper, glassine paper and the like.

  As a metal which comprises a metal base material, aluminum, copper, silver, gold | metal | money etc. are mentioned, for example.

Examples of the resin constituting the resin film include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyolefin resins such as polyethylene and polypropylene; polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, and ethylene-vinyl acetate. Vinyl resins such as copolymers and ethylene-vinyl alcohol copolymers; polystyrene; acrylonitrile-butadiene-styrene copolymers; cellulose triacetate; polycarbonate; urethane resins such as polyurethane and acrylic-modified polyurethane; polymethylpentene; Polyetheretherketone; Polyethersulfone; Polyphenylene sulfide; Polyimide resins such as polyetherimide and polyimide; Polyamide Resins, acrylic resins, fluorine-based resins.
Among these, it is preferable that a resin film contains 1 or more types of resin chosen from polyester-type resin and polyolefin resin.

These resin films may be composed of only one kind of resin, or may be composed of two or more kinds of resins.
The resin film may be unstretched, or may be stretched in a uniaxial direction or a biaxial direction such as longitudinal or lateral.
Further, the resin film may be a resin film having a cavity-containing layer including a cavity inside. In addition, it is good also as a resin film which laminated | stacked the resin layer which does not contain a cavity further on the at least one surface side of the said cavity content layer.
In addition, the resin film may contain various additives such as an ultraviolet absorber, a light stabilizer, an antioxidant, an antistatic agent, a slip agent, an antiblocking agent, and a colorant together with these resins.

These base materials may be used alone or in combination of two or more types.
The multilayer body used as the substrate includes a laminate substrate obtained by laminating a paper substrate with a resin, a resin film with a metal film having a metal film on the surface of the resin film, and the like.

  Examples of the laminated base material include laminated paper obtained by laminating the above paper base material with a thermoplastic resin such as polyethylene.

The metal film which a resin film with a metal film has can be formed from metals such as aluminum, tin, chromium, and titanium.
As a method of forming a metal film on the surface of a resin film, a method of depositing these metals by a PVD (physical vapor deposition) method such as vacuum deposition, sputtering, or ion plating, or a metal foil made of the above metals is generally used. The method of sticking using a typical adhesive is mentioned.

In addition, when the base material used by 1 aspect of this invention is a resin film or a laminate base material, it is an oxidation method or uneven | corrugated with respect to the surface of these base materials from a viewpoint of improving adhesiveness with an adhesive layer. Surface treatment such as chemical conversion or primer treatment may be performed.
The oxidation method is not particularly limited, and examples thereof include a corona discharge treatment method, a plasma treatment method, chromic acid oxidation (wet), flame treatment, hot air treatment, and ozone / ultraviolet irradiation treatment.
The unevenness forming method is not particularly limited, and examples thereof include a sand blast method and a solvent treatment method.

  The base material used in one embodiment of the present invention is preferably a resin film and a laminated base material from the viewpoint of preventing breakage of the pressure-sensitive adhesive sheet at the time of use and preventing wrinkles from entering, and further a wrist of a human body. A resin film is more preferable from the viewpoint of improving the usability in the case of wrapping around a resin film, and a resin film containing one or more resins selected from polyester resins and polyolefin resins is more preferable. A resin film containing one or more resins selected from resins and having a void-containing layer is even more preferable.

From the viewpoint of making the pressure-sensitive adhesive sheet easy to bend and having excellent shape maintainability during use, the bending resistance of the substrate used in one embodiment of the present invention is preferably 0.10 to 0.45 mN, more preferably It is 0.14-0.28 mN, More preferably, it is 0.18-0.24 mN.
From the same viewpoint, the tear strength of the substrate used in one embodiment of the present invention is preferably 100 to 1000 mN, more preferably 200 to 500 mN, and still more preferably 250 to 350 mN.
In the present specification, the bending resistance and tear strength of the substrate mean values measured based on the methods described in the examples.
In addition, the bending resistance and tear strength of the substrate are values obtained by measuring along at least one of the flow direction (MD direction) during molding of the substrate and the direction perpendicular to the MD direction (TD direction). However, what is necessary is just to belong to the said range.
In addition, when it is difficult to specify the MD direction and the TD direction of the base material, if the base material is rectangular, the bending resistance or tear strength along the longitudinal direction or the horizontal direction of the base material is as described above. It only has to belong to the range.

  As thickness of a base material, Preferably it is 5-1000 micrometers, More preferably, it is 10-500 micrometers, More preferably, it is 12-250 micrometers, More preferably, it is 15-150 micrometers.

(Adhesive layer)
The pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet of the present invention comprises at least one styrene resin (A) selected from a styrene-isoprene block copolymer (SI) and a styrene-isoprene-styrene triblock copolymer (SIS). And a layer formed from an adhesive composition containing one or more tackifying resins (B) selected from non-hydrogenated terpene resins and rosin resins.
The above-mentioned styrene resin (A) and tackifying resin (B) have a relatively small influence on the human body. Therefore, a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer containing these components can be highly safe to the human body.

Moreover, since the adhesive layer which the adhesive sheet of this invention has contains the said styrene resin (A) and tackifying resin (B), when the adhesive surfaces of an adhesive layer are bonded together, an adhesive surface The adhesive strength between each other can be adjusted to be high.
The reason why the adhesive force between the adhesive surfaces is improved is that the non-hydrogenated terpene resin and rosin resin contained as the tackifier resin (B) in the adhesive layer are difficult to bleed out on each adhesive surface. There is. Therefore, when the adhesive surfaces are bonded to each other, at the interface between the two adhesive surfaces, the entanglement of the molecular chains between the styrenic resins (A) easily proceeds, and as a result, the adhesive force at the interface between the adhesive surfaces improves. It is thought that.

  The thickness of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet of one embodiment of the present invention is preferably 30 to 150 μm, more preferably 40 to 120 μm, still more preferably 44 to 90 μm, and still more preferably 48 to 70 μm.

The pressure-sensitive adhesive composition, which is a material for forming the pressure-sensitive adhesive layer, may contain other resin components and additives for pressure-sensitive adhesives together with the components (A) and (B) as long as the effects of the present invention are not impaired. Good.
However, in one aspect of the present invention, the total content of components (A) and (B) is preferably 90 to 100% by mass with respect to the total amount (100% by mass) of the active ingredients in the pressure-sensitive adhesive composition. More preferably, it is 92-100 mass%, More preferably, it is 95-100 mass%, More preferably, it is 98-100 mass%.
In the present specification, the “active component of the pressure-sensitive adhesive composition” refers to a component obtained by removing a solvent such as water or an organic solvent from the components contained in the pressure-sensitive adhesive composition.

<Styrene resin (A)>
The pressure-sensitive adhesive composition used in the present invention includes a styrene-isoprene block copolymer (SI) (hereinafter also referred to as “SI resin”) and a styrene-isoprene-styrene triblock copolymer (SIS) (hereinafter referred to as “SIS resin”). 1) or more styrene-based resin (A) selected from.
In one aspect of the present invention, from the viewpoint of forming a pressure-sensitive adhesive layer having a higher adhesive force between pressure-sensitive adhesive surfaces, it is preferable to use an SI resin and a SIS resin in combination as the styrene resin (A).

  In one aspect of the present invention, the content of the SI resin relative to the total amount (100% by mass) of the styrene resin (A) is preferably from the viewpoint of forming a pressure-sensitive adhesive layer having a higher adhesive force between the pressure-sensitive surfaces. It is 10-90 mass%, More preferably, it is 20-80 mass%, More preferably, it is 25-75 mass%, More preferably, it is 30-70 mass%, More preferably, it is 35-65 mass%.

  Moreover, in 1 aspect of this invention, as content of the structural unit derived from styrene with respect to the whole quantity (100 mass%) of the structural unit of styrene resin (A), the adhesive with higher adhesive force of adhesive surfaces From the viewpoint of forming a layer, it is preferably 5 to 40% by mass, more preferably 8 to 35% by mass, still more preferably 10 to 30% by mass, and still more preferably 12 to 25% by mass.

  The mass average molecular weight (Mw) of the styrene resin (A) is preferably 10,000 to 500,000, more preferably 20,000 to 400,000, more preferably 25,000 to 350,000, and still more preferably 30,000. ~ 300,000.

  In the pressure-sensitive adhesive composition used in one embodiment of the present invention, the content of the component (A) is preferably 30 to 80% by mass with respect to the total amount (100% by mass) of the active ingredients in the pressure-sensitive adhesive composition. Preferably it is 35-70 mass%, More preferably, it is 40-65 mass%, More preferably, it is 45-60 mass%.

<Adhesive resin other than component (A)>
The pressure-sensitive adhesive composition used in one embodiment of the present invention may contain a pressure-sensitive adhesive resin having a mass average molecular weight (Mw) other than the component (A) of 10,000 or more, as long as the effects of the present invention are not impaired. From the viewpoint of forming a pressure-sensitive adhesive layer having higher adhesive force between pressure-sensitive adhesive surfaces, the content of the pressure-sensitive resin is preferably as small as possible.

  As content of adhesive resin other than a component (A), Preferably it is 0-10 mass parts with respect to 100 mass parts of whole quantity of the component (A) contained in an adhesive composition, More preferably, it is 0-5. It is 0 mass part, More preferably, it is 0-1 mass part, More preferably, it is 0-0.01 mass part.

  Examples of such an adhesive resin include styrene resins other than the component (A), acrylic resins, urethane resins, polyisobutylene resins, and the like.

<Tackifying resin (B)>
The pressure-sensitive adhesive composition used in the present invention contains one or more tackifying resins (B) selected from non-hydrogenated terpene resins and rosin resins.
In the present invention, a pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer having a high adhesive force between pressure-sensitive adhesive surfaces by containing the above-described styrenic resin (A) and a specific tackifier resin (B) in combination. It can be a thing.

In the present specification, the tackifier resin is a component that assists in improving the adhesive strength of the adhesive resin, and is an oligomer having a mass average molecular weight (Mw) of usually less than 10,000. It is distinguished from resin.
The mass average molecular weight (Mw) of the tackifier resin (B) is preferably 400 to 4000, more preferably 800 to 1500.

  The non-hydrogenated terpene resin that can be selected as the tackifier resin (B) may be any compound that has a structural unit derived from isoprene and is not hydrogenated. For example, a terpene resin, an aromatic modified terpene Examples thereof include resins and terpene phenol resins.

Examples of the rosin resin that can be selected as the tackifier resin (B) include rosin resins, rosin phenol resins, and rosin esters, and rosin esters are preferable.
The rosin resin may be a hydrogenated rosin resin obtained by hydrogenating the above compound.

  In one embodiment of the present invention, from the viewpoint of forming a pressure-sensitive adhesive layer having a higher adhesive force between pressure-sensitive adhesive surfaces, the tackifying resin (B) includes a non-hydrogenated terpene resin, a rosin ester, and a hydrogenated rosin ester. It is preferable that it is 1 or more types chosen from these, and it is more preferable that it is a non-hydrogenated terpene resin.

The softening point of the tackifier resin (B) is preferably from 70 to 140 ° C, more preferably from 80 to 135 ° C, and even more preferably from 85 to 140 ° C, from the viewpoint of forming a pressure-sensitive adhesive layer having a higher adhesive force between the adhesive surfaces. 130 degreeC, More preferably, it is 105-125 degreeC.
In addition, in this specification, the softening point of tackifying resin means the value measured based on JISK2531.
Moreover, when using together 2 or more types of tackifying resin, it is preferable that the value of the weighted average calculated from the softening point and compounding quantity of each tackifying resin is the said range.

  In one embodiment of the present invention, the content of the component (B) is preferably 30 to 200 parts by mass, more preferably 50 to 180 parts by mass with respect to 100 parts by mass of the total amount of the component (A) in the pressure-sensitive adhesive composition. Parts, more preferably 60 to 150 parts by mass, and still more preferably 70 to 120 parts by mass.

<Tackifying resin other than component (B)>
In the pressure-sensitive adhesive composition used in one embodiment of the present invention, a tackifier resin other than the component (B) may be contained within a range not impairing the effects of the present invention, but the pressure-sensitive adhesive having a higher adhesive force between the pressure-sensitive surfaces. From the viewpoint of forming the agent layer, the content of the tackifying resin other than the component (B) is preferably as small as possible.

  As content of adhesive resin other than a component (B), Preferably it is 0-10 mass parts with respect to 100 mass parts of whole quantity of the component (B) contained in an adhesive composition, More preferably, it is 0-5. It is 0 mass part, More preferably, it is 0-1 mass part, More preferably, it is 0-0.01 mass part.

<Adhesive additive>
The pressure-sensitive adhesive composition used in one embodiment of the present invention may further contain a general pressure-sensitive adhesive additive as long as the effects of the present invention are not impaired.
Examples of such an adhesive additive include a crosslinking agent, an ultraviolet absorber, an antioxidant, a rust inhibitor, an antibacterial material, an insecticide, a fragrance, a pigment, a dye, a curing agent, a curing aid, and a catalyst. Can be mentioned.

In addition, in the pressure-sensitive adhesive composition used in one embodiment of the present invention, from the viewpoint of maintaining good adhesion between pressure-sensitive adhesive surfaces, the content of the plasticizer is less in applications where the pressure-sensitive adhesive surfaces are used together. preferable.
When the plasticizer is contained in the pressure-sensitive adhesive layer, it becomes a bleed product and may cause a decrease in the adhesive force between the pressure-sensitive surfaces.
Examples of such a plasticizer include liquid paraffin.

  As content of a specific plasticizer, Preferably it is 0-5 mass parts with respect to a total of 100 mass parts of component (A) and (B) contained in an adhesive composition, More preferably, it is 0-1. It is 0 mass parts, More preferably, it is 0-0.1 mass part, More preferably, it is 0 mass part (it does not contain).

In the pressure-sensitive adhesive composition used in one embodiment of the present invention, the content of the filler is preferably as small as possible from the viewpoint of maintaining good adhesion between the pressure-sensitive adhesive surfaces.
Examples of the filler include a conductive filler, a metal oxide, and silica.
The specific filler content is preferably 0-5 parts by mass, more preferably 0-1 with respect to 100 parts by mass in total of the components (A) and (B) contained in the pressure-sensitive adhesive composition. It is 0 mass parts, More preferably, it is 0-0.1 mass part, More preferably, it is 0 mass part (it does not contain).

[Release material]
As the release material of the pressure-sensitive adhesive sheet of one embodiment of the present invention, a release material that has been subjected to a double-sided release treatment, a release material that has been subjected to a single-side release treatment, or the like is used, and a release agent is applied on a release material base Etc.
Examples of the base material for the release material include paper base materials such as glassine paper, coated paper, high-quality paper, laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper base materials, or polyethylene terephthalate resin, polybutylene terephthalate. Examples thereof include plastic films such as resins, polyester resin films such as polyethylene naphthalate resin, and polyolefin resin films such as polypropylene resin and polyethylene resin.
Examples of the release agent include silicone resins, olefin resins, long chain alkyl resins, alkyd resins, fluorine resins, and the like.

  The thickness of the release material is appropriately set, but is preferably 10 to 200 μm, and more preferably 25 to 150 μm.

(Non-adhesive layer)
Like the adhesive sheet 4 shown in FIG. 4, the adhesive sheet of 1 aspect of this invention is good also as a structure which has a non-adhesive layer in a part of adhesive surface of an adhesive layer.
The constituent material of the non-adhesive layer is appropriately selected according to the application. For example, various paper materials also used as the above-mentioned base material; metal film containing aluminum, copper, silver, gold, etc .; acrylic resin One or more selected from acrylic urethane resins, polyurethane resins, butyral resins, nitrocellulose resins, acetylcellulose resins, polyester resins, vinyl chloride resins, vinyl chloride-vinyl acetate copolymer resins, etc. A resin film containing a non-adhesive resin.

  When the non-adhesive layer is composed of a resin film, the resin film is formed using an ink containing a colorant such as a pigment or a dye, a filler, a solvent, etc. together with the non-adhesive resin described above. It may be what was done.

The pigment may be either an inorganic pigment or an organic pigment.
Examples of inorganic pigments include carbon black and metal oxides.
Examples of organic pigments include azo pigments, diazo pigments, phthalocyanine pigments, quinacridone pigments, isoindolinone pigments, dioxazine pigments, perylene pigments, perinone pigments, thioindigo pigments, anthraquinone pigments, and quinophthalone pigments.
Examples of the dye include acid dyes, reactive dyes, direct dyes, oil-soluble dyes, disperse dyes, and cationic dyes.

The filler is preferably composed of fine particles, and may be inorganic particles or organic particles.
The average particle diameter of the fine particles is usually 0.01 to 100 μm.

Examples of inorganic particles used as a filler include metals, metal oxides (silica, alumina, boehmite, titanium oxide, etc.), minerals (montmorillonite, beidellite, hectorite, saponite, stevensite, nontronite, soconite, etc. Smectite and bentonite), calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, aluminum hydroxide, aluminum silicate, calcium silicate, magnesium silicate, and the like.
Examples of the organic particles used as the filler include acrylic beads.

  The thickness of the non-adhesive layer is preferably 0.05 to 16 μm, more preferably 0.1 to 12 μm, and still more preferably 0.5 to 8 μm.

The method for forming the non-adhesive layer can be appropriately selected depending on the constituent material of the non-adhesive layer.
For example, when the non-adhesive layer is made of a paper material, it can be formed by laminating the paper material on the adhesive surface of the adhesive layer.
When the non-adhesive layer is composed of a metal film, it is preferably formed by vapor deposition on the adhesive surface of the adhesive layer.

When the non-adhesive layer is composed of a resin film, the resin composition containing the non-adhesive resin is applied to the adhesive surface of the adhesive layer to form a coating film, and then the coating film is dried to form can do.
At this time, the resin composition may be in the form of a solution by adding a diluent solvent.
Moreover, as a coating method, a well-known method can be applied, but it may be performed by printing such as gravure printing, screen printing, offset printing, and flexographic printing.
Furthermore, after the resin film is formed on the release treatment surface of the release material by the above method, the resin film and the adhesive surface of the adhesive layer can be bonded to each other.

[Method for producing adhesive sheet]
There is no restriction | limiting in particular as a manufacturing method of the adhesive sheet of this invention, According to the structure of an adhesive sheet, it selects suitably.
As a method for forming the pressure-sensitive adhesive layer, the above-mentioned pressure-sensitive adhesive composition is applied on the release treatment surface of the substrate or the release material to form a coating film, and the coating film is dried to form a pressure-sensitive adhesive layer. It is preferable to do.
In addition, in order to improve the workability | operativity of application | coating on the peeling surface of a base material or a peeling material, it is preferable to further dilute an adhesive composition with a dilution solvent and to make the form of a solution.

Examples of the dilution solvent include water and organic solvents such as methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran, dioxane, cyclohexane, n-hexane, toluene, xylene, n-propanol, and isopropanol.
As solid content concentration of the solution of an adhesive composition, Preferably it is 5-70 mass%, More preferably, it is 10-65 mass%, More preferably, it is 15-60 mass%.

Examples of the method for applying the solution of the pressure-sensitive adhesive composition include spin coating, spray coating, bar coating, knife coating, roll coating, blade coating, and die coating.
Moreover, as an application method, you may perform by printing, such as gravure printing, screen printing, offset printing, flexographic printing.

As a specific manufacturing method, the pressure-sensitive adhesive sheet of the first aspect of the present invention shown in FIG. 1 and the method of manufacturing the pressure-sensitive adhesive sheet of the second aspect of the present invention shown in FIG. The process of forming the 1st adhesive layer 21 and the 2nd adhesive layer 22 by apply | coating the solution of an adhesive composition on the predetermined | prescribed surface of 10, forming a coating film, and drying the said coating film. The manufacturing method which has is mentioned.
The formation of the first pressure-sensitive adhesive layer 21 and the second pressure-sensitive adhesive layer 22 is preferably performed simultaneously, but may be performed separately.

  Moreover, as another manufacturing method of the adhesive sheet of the 1st and 2nd aspect of this invention, it is the same as the above using the solution of an adhesive composition on the peeling process surface of a peeling material, and an adhesive. After the layer is formed, the laminate composed of the release material and the pressure-sensitive adhesive layer is cut into a predetermined size, and the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer of the cut laminate is bonded to a predetermined position of the substrate. A method is also mentioned.

As a manufacturing method of the adhesive sheet of the 3rd aspect of this invention shown in FIG. 3, it is the same as the above using the solution of an adhesive composition on the surface of either one of a base material and a peeling material, for example. Thus, there can be mentioned a production method having a step of forming a pressure-sensitive adhesive layer and laminating the other release material or substrate on the pressure-sensitive adhesive layer to obtain a laminate.
In addition, you may use the peeling material which provided the notch part previously as the peeling material used at the said process.
Moreover, when using the peeling material which does not provide the notch part, after obtaining a laminated body in the said process, from the peeling material side of a laminated body, it cuts toward a thickness direction in a predetermined position, and a notch part Can be provided.

As a method for producing the pressure-sensitive adhesive sheet of the fourth aspect of the present invention shown in FIG. 4, for example, a pressure-sensitive adhesive layer is formed on the surface of a base material in the same manner as described above using a solution of the pressure-sensitive adhesive composition. The manufacturing method which has the process of forming and forming a non-adhesive layer in the predetermined position of the adhesion surface of the said adhesive layer is mentioned.
Examples of the method for forming the non-adhesive layer include the above-described methods, and are appropriately selected depending on the constituent material of the non-adhesive layer.
In addition, after forming a non-adhesive layer, you may laminate | stack a peeling material further on the adhesive surface which the adhesive layer has exposed, and the surface of a non-adhesive layer.

[Use of adhesive sheet]
The pressure-sensitive adhesive sheet of the present invention has high safety to the human body and can be suitably used as an identification label that is not easily peeled off by the environment or impact during use.
Therefore, it is preferable that the pressure-sensitive adhesive sheet of the present invention is used as an identification label by being wound around a handle portion or around a wrist or ankle of a human or an animal.
More specifically, an identification label attached to a suitcase handle, etc. at an airport, an identification label wrapped around the wrist or ankle of a human or animal at a hospital, and whether or not a vehicle with height restrictions can be boarded at an amusement park. Applications include identification labels wound around children's wrists for identification, identification labels wound around plant branches and stems, and the like.

In the following examples and comparative examples, methods for measuring various physical properties are as described below.
<Mass average molecular weight (Mw)>
Using a gel permeation chromatograph (manufactured by Tosoh Corporation, product name “HLC-8020”), the measurement was performed under the following conditions, and the measurement was performed in terms of standard polystyrene.
(Measurement condition)
Column: “TSK guard column HXL-H”, “TSK gel GMHXL” (two), and “TSK gel G2000HXL” (both manufactured by Tosoh Corporation) Column temperature: 40 ° C.
・ Developing solvent: Tetrahydrofuran ・ Flow rate: 1.0 mL / min

<Softening point>
It measured based on JISK2531.

<Flexibility of base material>
A sample for measurement was prepared by cutting a base material used in Examples and Comparative Examples into a rectangle of length 38 mm × width 25 mm.
About the measurement sample, using a bending resistance tester (manufactured by Toyo Seiki Seisakusho Co., Ltd., product name “Gurley type flexibility tester”) under an environment of 23 ° C. and 50% RH (relative humidity), JIS In accordance with the Gurley method of L 1096 (1999) 8.20.1, the stiffness of the substrate in the flow direction (MD direction) during molding of the substrate and the direction perpendicular to the MD direction (TD direction) Each degree was measured.

<Tear strength of substrate>
A sample for measurement was prepared by cutting a base material used in Examples and Comparative Examples into a rectangle having a length of 75 mm and a width of 63 mm.
Four measurement samples are stacked, and a tear test is performed in accordance with JIS K 7128 using an Elmendorf Tear Tester (Toyo Seiki Seisakusho Co., Ltd.) in an environment of 23 ° C. and 50% RH (relative humidity). 4 times each in the MD direction and TD direction of the substrate. Then, the average value of each of the four values measured in the MD direction and the TD direction (tear strength for four base materials) is calculated, respectively, and the value of 1/4 of the average value is the tear strength of the base material. did.

<Thickness of adhesive layer>
Using a constant pressure thickness measuring instrument (manufactured by Teclock Co., Ltd., product name “PG-02J”), the thickness was measured according to JIS K6783, Z1702, and Z1709.

Examples 1-8, Comparative Examples 1-4
Each component of the kind and compounding quantity (solid content ratio) shown in Table 1 was added, further diluted with toluene, and stirred to prepare respective solutions of the pressure-sensitive adhesive composition having a solid content concentration of 50% by mass.
And the adhesive composition prepared in the 2 area | region from the both ends of the said peeling sheet to 100 mm on the peeling process surface of a 300 mm wide release sheet (the product name "SP-PET751130", thickness 75micrometer make by Lintec Corporation). The coating solution was applied to form coating films, and the two coating films were dried at 100 ° C. for 1 minute to form 55 μm thick adhesive layers, respectively.
Next, a foamed polyethylene terephthalate (PET) film (1) having a void-containing layer as a base material (product name “Crisper K2411” manufactured by Toyobo Co., Ltd., thickness 50 μm, bending resistance: MD direction = 0.25 mN, The non-matt surface (TD direction = 0.28 mN, tear strength: MD direction = 319 mN, TD direction = 294 mN) and the adhesive surfaces of the two adhesive layers formed were bonded together, and the adhesive sheet shown in FIG. A pressure-sensitive adhesive sheet having the same configuration as 1A was prepared.

Example 9
Foamed PET film (2) having a void-containing layer as a substrate (thickness 50 μm, bending resistance: MD direction = 0.21 mN, TD direction = 0.22 mN, tear strength: MD direction = 270 mN, TD direction = 294 mN A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1, except that

Comparative Examples 5-6
Each component of the kind and the compounding quantity (solid content ratio) shown in Table 1 was added, and it diluted with ethyl acetate, and prepared the solution of the adhesive composition, respectively.
Then, on the release treatment surface of the release sheet (product name “SP-PET751130”, manufactured by Lintec Corporation, thickness 75 μm), the prepared pressure-sensitive adhesive composition solution is dried to have a thickness of 55 μm. A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that a coating film was formed by coating and the coating film was dried at 100 ° C. for 1 minute to form a pressure-sensitive adhesive layer having a thickness of 55 μm.

The detail of each component of Table 1 used for preparation of an adhesive composition is as follows.
<Adhesive resin>
Styrene resin (1): SIS resin (triblock body) / SI resin (diblock body) = 75/25 (mass%) mixed resin, styrene content = 15 mass%, Mw = 190,000.
Styrene resin (2): SIS resin (triblock body) / SI resin (diblock body) = 25/75 (mass%) mixed resin, styrene content = 15 mass%, Mw = 160,000.
Styrene resin (3): SIS resin (triblock body) / SI resin (diblock body) = 35/65 (mass%) mixed resin, styrene content = 25 mass%, Mw = 180,000.
Acrylic resin (1): acrylic copolymer having an Mw of 1 million, which is obtained by copolymerizing n-butyl acrylate (BA), methyl methacrylate (MMA), vinyl acetate (VAc), and 2-hydroxyethyl acrylate (HEA) Combined (constituent unit ratio: BA / MMA / VAc / HEA = 80.0 / 10.0 / 9.0 / 1.0 (mass%)).

<Tackifying resin>
Non-hydrogenated terpene resin (1): manufactured by Yasuhara Chemical Co., Ltd., product name “YS Resin PX1150N”, non-hydrogenated terpene resin, Mw = less than 10,000, softening point = 115 ° C.
Non-hydrogenated terpene resin (2): manufactured by Yasuhara Chemical Co., Ltd., product name “YS Resin PX1000”, non-hydrogenated terpene resin, Mw = less than 10,000, softening point = 100 ° C.
Rosin resin (1): manufactured by Arakawa Chemical Industries, Ltd., product name “Pine Crystal KE-100”, rosin ester resin, Mw = less than 10,000, softening point = 100 ° C.
Rosin resin (2): manufactured by AR BROWN, product name “Sylvalite RE85L”, non-hydrogenated rosin resin, Mw = less than 10,000, softening point = 85 ° C.
Rosin resin (3): manufactured by Arakawa Chemical Industries, Ltd., product name “Ester Gum HP”, hydrogenated rosin ester resin, Mw = less than 10,000, softening point = 80 ° C. or higher.
Rosin resin (4): manufactured by Arakawa Chemical Industries, Ltd., product name “Pine Crystal KE-359”, rosin ester resin, Mw = less than 10,000, softening point = 99 ° C.
Hydrogenated terpene resin (1): manufactured by Yasuhara Chemical Co., Ltd., product name “Clearon P105”, hydrogenated terpene resin, Mw = less than 10,000, softening point = 105 ° C.
Hydrocarbon resin (1): manufactured by Arakawa Chemical Industries, Ltd., product name “Alcon P-100”, alicyclic saturated hydrocarbon resin, Mw = less than 10,000, softening point = 100 ° C.
Hydrocarbon resin (2): manufactured by Arakawa Chemical Industries, Ltd., product name “Alcon P-90”, alicyclic saturated hydrocarbon resin, Mw = less than 10,000, softening point = 90 ° C.
Styrene resin (1): copolymer of styrene monomer and aliphatic monomer, Mw = less than 10,000, softening point = 95 ° C.

<Other additives>
Crosslinking agent (1): manufactured by Mitsui Chemicals, product name “Takenate D-110N”, isocyanate crosslinking agent.

  Using the pressure-sensitive adhesive sheets prepared in Examples and Comparative Examples, “adhesive strength against SUS plate” and “adhesive strength between pressure-sensitive adhesive surfaces” were measured based on the following methods. These results are shown in Table 1.

<Adhesive strength to stainless steel plate>
It cut | disconnected by 25 mm x 250 mm so that only the adhesion application part of an adhesive sheet could be cut off, and the test piece formed by laminating | stacking a base material / adhesive layer / release sheet was produced.
The release sheet of the test piece was removed, and the surface of the exposed adhesive layer was affixed to a stainless steel plate (SUS304 No. 360 polishing) as an adherend using a 2 kg roller, and 23 ° C., 50% RH ( (Relative humidity) in an environment for 30 minutes.
After standing, the adhesive strength to the stainless steel plate was measured at a pulling speed of 300 mm / min by a 180 ° peeling method based on JIS Z0237: 2000.

<Adhesive strength between adhesive surfaces>
A test in which the adhesive coated part / adhesive uncoated part / adhesive coated part of the adhesive sheet are cut into a size of 25 mm × 300 mm so that each part is included in this order, and the substrate / adhesive layer / release sheet is laminated. A piece was made. The release sheet was removed, and the surfaces of the exposed pressure-sensitive adhesive layer were bonded together.
After bonding, the middle of the adhesive-applied portion (the portion 50 mm from both sides of the uncoated portion 100 mm) was cut with scissors.
Immediately after pasting and after standing for 24 hours in an environment of 23 ° C. and 50% RH (relative humidity), both ends of the pressure-sensitive adhesive sheet were pulled at both ends at 300 mm / min based on JIS Z0237: 2000. The resistance at the time of peeling from the part into the T-shape was measured as the adhesive force between the adhesive surfaces.

  From Table 1, the pressure-sensitive adhesive sheets produced in Examples 1 to 9 resulted in higher adhesive force between the pressure-sensitive adhesive surfaces than the pressure-sensitive adhesive sheets of Comparative Examples 1 to 6.

1A, 1B, 2A, 2B, 3, 4 Adhesive sheet 10 Substrate 10a, 10b Surface 20 Adhesive layer 201a, 202a Adhesive surface 21 First adhesive layer 22 Second adhesive layer 21a, 22a Adhesive surfaces 30, 31, 32 Release material 301, 302 Release material end 40 Non-adhesive layer X1, X2 Notch

Claims (13)

A pressure-sensitive adhesive sheet having a base material and a pressure-sensitive adhesive layer, which is used by bonding the pressure-sensitive adhesive surfaces of the pressure-sensitive adhesive layer,
The pressure-sensitive adhesive layer is one or more styrene resins (A) selected from styrene-isoprene diblock copolymer (SI) and styrene-isoprene-styrene triblock copolymer (SIS), and non-hydrogenated The adhesive sheet which is a layer formed from the adhesive composition containing 1 or more types of tackifying resin (B) chosen from terpene resin and rosin resin.   The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet has a configuration in which a pressure-sensitive adhesive layer is laminated on a part of the surface of the base material.   The pressure-sensitive adhesive sheet according to claim 2, wherein there are two or more pressure-sensitive adhesive layers laminated on a part of the surface of the substrate.   2. The pressure-sensitive adhesive sheet according to claim 1, wherein a part of the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer is exposed at two or more locations or can be expressed at two or more locations.   Adhesion as described in any one of Claims 1-4 whose sum total content of a component (A) and (B) is 90-100 mass% with respect to the whole quantity of the active ingredient of the said adhesive composition. Sheet.   The content of the component (B) is 30 to 200 parts by mass with respect to 100 parts by mass of the total amount of the component (A) in the pressure-sensitive adhesive composition, according to any one of claims 1 to 5. Adhesive sheet.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 6, wherein the content of the structural unit derived from styrene is 5 to 40% by mass relative to the total amount of the structural unit of the styrene-based resin (A).   The pressure-sensitive adhesive sheet according to any one of claims 1 to 7, wherein the content of the styrene-isoprene diblock copolymer (SI) with respect to the total amount of the styrene resin (A) is 10 to 90% by mass.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 8, wherein a softening point of the tackifier resin (B) is 70 to 140 ° C.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 9, wherein the pressure-sensitive adhesive layer has a thickness of 30 to 150 µm.   The adhesive sheet as described in any one of Claims 1-10 whose bending resistance of the said base material is 0.10-0.45mN.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 11, wherein the base material is a resin film containing at least one resin selected from a polyester-based resin and a polyolefin-based resin and having a cavity-containing layer.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 12, wherein the pressure-sensitive adhesive sheet is used as an identification label by being wound around a handle portion or around a wrist or ankle of a human or an animal.