adhesive labels

Abstract

To provide a novel adhesive label used by sticking an adhesive label which is a laminate including at least a base material, an adhesive layer and a release liner to an adherend, and then separating the base material from the laminate, which can prevent "lifting" generated by impact when the release liner is peeled from the adhesive label at high speed, enables separation of the base material from the laminate without requiring high force than necessary in use of the adhesive label, and can prevent stickiness on the adhesive label side surface after separation of the base material.SOLUTION: An adhesive label is a laminate where a base material (Y), a cohesive failure layer (X), an adhesive layer (Z), and a release liner are laminated in this order, wherein the layer (X) is a layer formed from a specific first resin layer (X1) and a specific second resin layer (X2), and has the layer (X1) and the layer (X2) in this order from the base material (Y) side, and the layer (X) is destroyed by occurrence of cohesive failure in the layer (X1), resulting in separation of the base material (Y) and the layer (Z).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a pressure-sensitive adhesive label. More specifically, the present invention relates to a pressure-sensitive adhesive label that is a laminate including at least a substrate, a pressure-sensitive adhesive layer, and a release liner, and that is used by separating the substrate from the laminate after the label is attached to an adherend. [Background technology]

[0002] In recent years, pressure-sensitive adhesive labels have been put to practical use as delivery slips, information-concealing labels, and the like. For example, pressure-sensitive adhesive labels used as delivery slips generally have a surface substrate with a half-cut line formed therein, which is separated into multiple peelable pieces. In such pressure-sensitive adhesive labels, for example, one surface substrate separated by the half-cut line is used as a delivery slip, and the other surface substrate is peeled off as a receipt. For this reason, known pressure-sensitive adhesive labels include those in which a surface substrate and an intermediate substrate are laminated via a resin layer, and when attached to an adherend, the surface substrate can be manually peeled off from the intermediate substrate together with the resin layer. Various types of information are generally printed on the surface substrate. Furthermore, the intermediate substrate usually remains adhered to the adherend by the pressure-sensitive adhesive layer even after the surface substrate is peeled off. As an example of an adhesive label that can be used for delivery slips and the like, Patent Document 1 discloses a pseudo-adhesive label in which a surface substrate, a first resin layer, an intermediate substrate, a second resin layer, an adhesive layer, and a release liner are laminated in this order, so that pseudo-adhesion is achieved between the first resin layer and the intermediate substrate, and between the intermediate substrate and the second resin layer, and the first resin layer is partially provided, and there is an unadhesive portion between the surface substrate and the intermediate substrate where the first resin layer is not present. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-61929 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, it is desirable that a pressure-sensitive adhesive label that can be used for a delivery slip or the like has a surface substrate that can be easily separated from the pressure-sensitive adhesive label with a peeling force that allows the surface substrate to be peeled off by hand. Furthermore, as described above, a part of the pressure-sensitive adhesive label remains on the adherend even after the surface substrate is peeled off, and therefore it is required to prevent the surface of the pressure-sensitive adhesive label from becoming sticky even after the surface substrate is peeled off. Furthermore, the pressure-sensitive adhesive label usually has a release liner on the surface of the pressure-sensitive adhesive layer, but the impact of peeling off the release liner at high speed may cause peeling at the edge of the label (commonly known as "lifting"). If "lifting" occurs during processing or use of the pressure-sensitive adhesive label, unintended peeling may occur during transportation or application to an adherend.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a novel adhesive label which is an adhesive label that is a laminate including at least a substrate, an adhesive layer, and a release liner, and is used by separating the substrate from the laminate after the label is affixed to an adherend, and which can prevent "lifting" caused by the impact when the release liner is peeled off from the adhesive label at high speed, and which can separate the substrate from the laminate without requiring a force greater than necessary when using the adhesive label, and which can prevent stickiness on the surface of the adhesive label after the substrate is separated. [Means for solving the problem]

[0006] The present inventors have found that the above-mentioned problems can be solved by providing a cohesive failure layer (X) having a specific composition between the substrate and the adhesive layer of the adhesive label, and have completed the present invention. That is, the present invention provides the following [1] to [9]. [1] A laminate comprising a substrate (Y), a cohesive failure layer (X), a pressure-sensitive adhesive layer (Z), and a release liner laminated in this order, the layer (X) is a layer formed from a first resin layer (X1) formed from a resin composition (x1) containing an ethylene-vinyl acetate resin (A) and a fatty acid metal salt (B), and a second resin layer (X2) formed from a resin composition (x2) containing a urethane resin (U), and the layer (X1) and the layer (X2) are arranged in this order from the substrate (Y) side; A pressure-sensitive adhesive label characterized in that cohesive failure occurs within the layer (X1), causing the layer (X) to break and separating the substrate (Y) and the layer (Z). [2] The adhesive label according to [1], wherein the content of the fatty acid metal salt (B) in the resin composition (x1) is 70 parts by mass or more per 100 parts by mass of the ethylene-vinyl acetate resin (A). [3] The adhesive label according to [1] or [2], wherein the content of the fatty acid metal salt (B) in the resin composition (x2) is less than 70 parts by mass per 100 parts by mass of the urethane resin (U). [4] The adhesive label according to any one of [1] to [3], wherein the total content of the ethylene-vinyl acetate resin (A) and the fatty acid metal salt (B) in the resin composition (x1) is 50% by mass or more, based on 100% by mass of the total solid content. [5] The adhesive label according to any one of [1] to [4], wherein the content of the urethane resin (U) in the resin composition (x2) is 50 mass% or more, based on 100 mass% of the total solid content. [6] The adhesive label according to any one of [1] to [5], wherein the fatty acid metal salt (B) is one or more selected from calcium stearate, magnesium stearate, zinc stearate, barium stearate, lithium stearate, and aluminum stearate. [7] The adhesive label according to any one of the above [1] to [6], wherein the thickness of the layer (X) is 40 μm or less. [8] The adhesive label according to any one of [1] to [7] above, which is a delivery slip label. [9] A method for producing an adhesive label according to any one of [1] to [8] above, comprising the following steps (S1) to (S4) in this order, and further comprising the following step (S5): Step (S1): A step of applying a resin composition (x1) containing an ethylene-vinyl acetate resin (A) and a fatty acid metal salt (B) onto one surface of a substrate (Y) to form a coating film (x1f). Step (S2): A step of drying the coating film (x1f) to form a first resin layer (X1) Step (S3): A step of applying a resin composition (x2) containing a urethane resin (U) to the surface of the first resin layer (X1) opposite to the substrate (Y) to form a coating film (x2f). Step (S4): A step of drying the coating film (x2f) to form a second resin layer (X2) Step (S5): Step of forming a pressure-sensitive adhesive layer (Z) and a release liner on the surface of the second resin layer (X2) opposite to the substrate (Y). [Effects of the Invention]

[0007] According to the present invention, a novel adhesive label can be provided, which is an adhesive label that is a laminate including at least a substrate, an adhesive layer, and a release liner, and is used by separating the substrate from the laminate after the label is affixed to an adherend, and which can prevent "lifting" that occurs due to the impact when the release liner is peeled off from the adhesive label at high speed, and which can separate the substrate from the laminate without requiring a force greater than necessary when using the adhesive label, and which can prevent stickiness on the surface of the adhesive label after the substrate is separated. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of an example of the configuration of an adhesive label of the present invention. [Figure 2] 1 is an image of the adhesive label produced in Example 1, obtained by observing with a scanning electron microscope the surface of the substrate (Y) on the side of the first resin layer (X1) after the first resin layer (X1) was subjected to cohesive failure and the substrate (Y) was peeled off from the adhesive label. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in detail below using embodiments. In this specification, the term "solid content" refers to the components contained in the target composition excluding diluent solvents such as water and organic solvents. In this specification, for preferred numerical ranges (e.g., ranges of content, etc.), lower and upper limits described in stages can be independently combined. For example, from the description "preferably 10 to 90, more preferably 30 to 60," the "preferable lower limit (10)" and the "more preferable upper limit (60)" can be combined to form "10 to 60." Similarly, from the description "preferably 10 or more, more preferably 30 or more" and the description "preferably 90 or less, more preferably 60 or less" for the same item, the "preferable lower limit (10)" and the "more preferable upper limit (60)" can be combined to form "10 or more and 60 or less." In addition, in this specification, the term "(meth)acrylic" is used to mean either or both of "acrylic" and "methacrylic."

[0010] [Adhesive labels] The pressure-sensitive adhesive label of the present invention is a laminate comprising a substrate (Y), a cohesive failure layer (X) (hereinafter also referred to as "layer (X)"), a pressure-sensitive adhesive layer (Z) (hereinafter also referred to as "layer (Z)"), and a release liner laminated in this order, wherein the layer (X) is a layer formed from a first resin layer (X1) (hereinafter also referred to as "layer (X1)") formed from a resin composition (x1) containing an ethylene-vinyl acetate resin (A) and a fatty acid metal salt (B), and a second resin layer (X2) (hereinafter also referred to as "layer (X2)") formed from a resin composition (x2) containing a urethane resin (U), and is characterized in that the layer (X1) and the layer (X2) are arranged in this order from the substrate (Y) side, and cohesive failure occurs in the layer (X1), causing the layer (X) to break and separating the substrate (Y) and the layer (Z).

[0011] The pressure-sensitive adhesive label of the present invention is not particularly limited as long as it is a laminate in which a substrate (Y), a layer (X), a layer (Z), and a release liner are laminated in this order, the layer (X) being a layer formed from the layer (X1) and the layer (X2), and having a configuration in which, from the substrate (Y) side, the layer (X1) and the layer (X2) are arranged in this order. One embodiment of the structure of the pressure-sensitive adhesive label is shown in FIG. FIG. 1 shows an example of an embodiment of the pressure-sensitive adhesive label of the present invention, which is a laminate in which a substrate (Y), a cohesive failure layer (X), a pressure-sensitive adhesive layer (Z), and a release liner 1 are directly laminated in this order, and the cohesive failure layer (X) is a laminate in which a first resin layer (X1) and a second resin layer (X2) are directly laminated in this order from the substrate (Y) side. Here, the above-mentioned "direct lamination" refers to, for example, in the case of the pressure-sensitive adhesive label 10 shown in Fig. 1, a configuration in which the layers are in direct contact with each other without any other layers between the substrate (Y), the layer (X), the layer (Z), and the release liner 1. More specifically, the pressure-sensitive adhesive label 10 shown in Fig. 1 is a laminate in which the substrate (Y), the layer (X1), the layer (X2), the layer (Z), and the release liner 1 are directly laminated in this order, and indicates a configuration in which the layers are in direct contact with each other without any other layers between the substrate (Y), the layer (X1), the layer (X2), the layer (Z), and the release liner 1. The structure of the adhesive label is preferably that of an adhesive label 10 shown in FIG.

[0012] The thickness of the adhesive label is preferably 10 μm or more, more preferably 15 μm or more, even more preferably 20 μm or more, and is preferably 150 μm or less, more preferably 130 μm or less, even more preferably 110 μm or less. In this specification, the "thickness of the adhesive label" means the thickness of the laminate excluding the release liner from the adhesive label. The thickness of the pressure-sensitive adhesive label can be measured, for example, by the method described in the Examples below, or can be calculated as the sum of the thicknesses of the layers described below. The thickness of each layer described later can be measured, for example, by the method described in the examples below.

[0013] <Base material (Y)> The substrate (Y) is not particularly limited, and may be appropriately selected from substrates used in conventional pressure-sensitive adhesive labels depending on the intended use of the pressure-sensitive adhesive label of the present invention. Examples of such substrates include papers such as kraft paper, fine paper, glassine paper, parchment paper, rayon paper, coated paper, and synthetic fiber paper; resin films such as polyester resins, polyvinyl chloride resins, polyvinylidene chloride resins, and polyolefin resins; synthetic paper; and laminated sheets of two or more of these.

[0014] The substrate (Y) preferably has thermosensitive coloring properties, which allows printing (including printing) using a thermal printer or the like. The thermosensitive color-developing substrate (Y) preferably has a thermosensitive color-developing layer on the surface of the substrate (Y) opposite to the surface on the layer (X) side (hereinafter also referred to as the "surface side of the substrate (Y)") or on the surface on the layer (X) side of the substrate (Y). However, when the substrate (Y) has a thermosensitive color-developing layer, it is more preferable that the thermosensitive color-developing layer is provided on the surface side of the substrate (Y) from the viewpoint of preventing the thermosensitive color-developing layer from developing color, for example, when a heat treatment is performed in the process of forming the layer (X) on the substrate (Y). In this specification, as mentioned above, a laminate in which a thermosensitive color developing layer is provided on a substrate (Y) is included in the substrate (Y). The thermosensitive coloring layer may contain, for example, a leuco dye and a color developer that reacts with the leuco dye. The thermosensitive color-developing layer is formed, for example, by applying a coating liquid containing the above-mentioned leuco dye and color developer, as well as a binder, wax, solvent, etc., to the surface side of the substrate (Y) or the surface of the substrate (Y) facing the layer (X). An example of the substrate (Y) having the above-mentioned thermosensitive coloring layer provided thereon is thermal paper. When the above-mentioned resin film is used as the substrate (Y), the resin film itself may have thermosensitive coloring properties.

[0015] Furthermore, when the pressure-sensitive adhesive label is used to conceal written information on an adherend, it is preferable to use a substrate having concealing properties. Examples of substrates having concealing properties include substrates such as opaque paper and synthetic paper, and opaque substrates formed by overcoating a substrate such as a transparent resin film with a black paint that imparts concealing properties and a white paint that serves as a printing base. However, from the viewpoint of achieving good printability in addition to concealing properties, it is preferable to use substrates such as paper and synthetic paper. Note that when a substrate such as paper or synthetic paper that is insufficiently opaque is used, a black coating treatment or the like may be applied to the side opposite the front side of the substrate (Y) to further improve concealing properties. Furthermore, at least one surface of the substrate (Y) may be previously subjected to a surface treatment such as sputtering, corona discharge, flame, ultraviolet irradiation, electron beam irradiation, etching treatment such as oxidation, or a priming treatment, if necessary.

[0016] The thickness of the substrate (Y) is appropriately selected depending on the application of the adhesive label, but from the viewpoint of handleability, it is preferably 10 μm or more, more preferably 20 μm or more, even more preferably 30 μm or more, and is preferably 200 μm or less, more preferably 150 μm or less, even more preferably 100 μm or less. Here, the "thickness of the substrate (Y)" means the thickness of the entire substrate (Y). For example, when a laminated sheet consisting of two or more layers as described above is used, the thickness of the substrate (Y) means the total thickness of all layers constituting the substrate (Y).

[0017] <Cohesive failure layer (X)> The cohesive failure layer (X) is a layer formed from a first resin layer (X1) formed from a resin composition (x1) containing an ethylene-vinyl acetate resin (A) and a fatty acid metal salt (B), and a second resin layer (X2) formed from a resin composition (x2) containing a urethane resin (U). The layer (X1) and the layer (X2) forming the layer (X) may each independently be a single layer or may be formed from multiple layers. However, from the viewpoint of simplifying the production process, for example, as shown in FIG. 1, the layer (X) is preferably a layer formed from a single layer (X1) and a single layer (X2), and more preferably a layer formed by directly laminating the single layer (X1) and the single layer (X2) in this order.

[0018] The thickness of the layer (X) is appropriately selected depending on the application of the pressure-sensitive adhesive label, but from the viewpoint of more easily achieving the effects of the present invention, it is preferably 4 μm or more, more preferably 6 μm or more, even more preferably 8 μm or more, and still more preferably 10 μm or more. Also, from the viewpoint of making the entire pressure-sensitive adhesive label thinner and lighter, it is preferably 40 μm or less, more preferably 35 μm or less, even more preferably 25 μm or less, and still more preferably 15 μm or less.

[0019] (1st resin layer (X1)) The first resin layer (X1) is formed from a resin composition (x1) containing an ethylene-vinyl acetate resin (A) (hereinafter also referred to as "component (A)") and a fatty acid metal salt (B) (hereinafter also referred to as "component (B)"). As described above, the pressure-sensitive adhesive label is characterized in that cohesive failure occurs in the layer (X1), causing the layer (X) to break and separating the substrate (Y) and the layer (Z).

[0020] [Resin composition (x1)] The resin composition (x1) contains a component (A) and a component (B). Hereinafter, each component contained in the resin composition (x1) that forms the layer (X1) will be described. In the present invention, the "content of each component in 100% by mass of the total solid content of the resin composition (x1)" can also be considered as the "content of each component in the layer (X1) formed from the resin composition (x1)."

[0021] {Ethylene-vinyl acetate resin (A)} The ethylene-vinyl acetate resin (A) is a copolymer obtained by copolymerizing at least ethylene and vinyl acetate as monomers. The content of vinyl acetate-derived structural units in component (A) is not particularly limited as long as the effects of the present invention are exhibited, but is preferably 3 to 50 mass %, more preferably 5 to 45 mass %, and even more preferably 10 to 40 mass % of all structural units in component (A). The total content of structural units derived from ethylene and vinyl acetate in component (A) is not particularly limited as long as the effects of the present invention are exhibited, but is preferably 50% by mass or more, more preferably 65% ​​by mass or more, and even more preferably 80% by mass or more of all structural units in component (A).

[0022] As long as the effects of the present invention are exhibited, component (A) may contain, in addition to structural units derived from ethylene and vinyl acetate, structural units derived from a monomer copolymerizable with one or both of ethylene and vinyl acetate. Examples of monomers copolymerizable with one or both of ethylene and vinyl acetate include alkenes such as propylene, butene, and butene; vinyl carboxylates other than vinyl acetate such as vinyl propionate, vinyl pivalate, and vinyl versatate; vinyl halides such as vinyl chloride; (meth)acrylic acid esters; vinyl carboxylic acids such as (meth)acrylic acid; and monomers having a functional group such as an amide group. Component (A) may be modified with an acid anhydride such as maleic anhydride, as long as the effects of the present invention are exhibited. Component (A) may also be used as an ethylene-vinyl acetate-vinyl alcohol copolymer by hydrolyzing the vinyl acetate-derived structural units, as long as the effects of the present invention are exhibited.

[0023] From the viewpoint of making cohesive failure more likely to occur in the layer (X1), the content of the ethylene-vinyl acetate resin (A) in the resin composition (x1) is preferably 10% by mass or more, more preferably 15% by mass or more, even more preferably 20% by mass or more, based on 100% by mass of the total solid content in the resin composition (x1), and is preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less.

[0024] {Fatty acid metal salts (B)} It is believed that the resin composition (x1) forming the layer (X1) contains the component (B), and therefore the cohesive strength is likely to be weaker than that of the layer (X2), causing cohesive failure in the layer (X1). Examples of the fatty acid metal salt (B) include salts of fatty acids having 6 to 30 carbon atoms and metals such as lithium, sodium, potassium, magnesium, calcium, barium, aluminum, zinc, and strontium. Examples of the fatty acids having 6 to 30 carbon atoms include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, ricinoleic acid, oleic acid, and behenic acid. Component (B) is preferably a metal salt of stearic acid, more preferably one or more selected from calcium stearate, magnesium stearate, zinc stearate, barium stearate, lithium stearate, and aluminum stearate, and even more preferably calcium stearate.

[0025] The content of fatty acid metal salt (B) in resin composition (x1) is preferably 70 parts by mass or more per 100 parts by mass of component (A). When the content of component (B) satisfies this content range, cohesive failure is more likely to occur in layer (X1), which is preferable. From this viewpoint, the content of component (B) in resin composition (x1) is more preferably 75 parts by mass or more, even more preferably 100 parts by mass or more, and even more preferably 120 parts by mass or more per 100 parts by mass of component (A). The upper limit of the content of component (B) in resin composition (x1) is not particularly limited as long as the effects of the present invention are exhibited. However, from the viewpoint that it is preferable to have a certain level of adhesive strength so as to make label lifting less likely to occur, for example, the content of component (B) in resin composition (x1) is preferably 400 parts by mass or less, more preferably 300 parts by mass or less, and even more preferably 250 parts by mass or less per 100 parts by mass of component (A). In this specification, the aforementioned "content of component (B) relative to 100 parts by mass of component (A) in resin composition (x1)" can also be considered as "content of component (B) relative to 100 parts by mass of component (A) in layer (X1) formed from resin composition (x1)."

[0026] Furthermore, the total content of the ethylene-vinyl acetate resin (A) and the fatty acid metal salt (B) in the resin composition (x1) is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and still more preferably 75% by mass or more, based on 100% by mass of the total solid content. Furthermore, the total content of the ethylene-vinyl acetate resin (A) and the fatty acid metal salt (B) in the resin composition (x1), relative to the total solid content (100% by mass), is preferably 96% by mass or less, more preferably 94% by mass or less, even more preferably 92% by mass or less, and still more preferably 90% by mass or less.

[0027] {Wax (C)} The resin composition (x1) may further contain a wax (C) (hereinafter also referred to as "component (C)"), if necessary. Examples of component (C) include hydrocarbon waxes and ester waxes, with hydrocarbon waxes being preferred. Examples of hydrocarbon waxes include polyolefin waxes such as polyethylene wax and polypropylene wax; paraffin wax; and the like, with paraffin wax being preferred.

[0028] When the resin composition (x1) contains the component (C), the content of the component (C) in the resin composition (x1) is preferably 3 parts by mass or more, more preferably 5 parts by mass or more, even more preferably 10 parts by mass or more, and is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, even more preferably 30 parts by mass or less, per 100 parts by mass of the component (A). In this specification, the aforementioned "content of component (C) relative to 100 parts by mass of component (A) in resin composition (x1)" can also be considered as "content of component (C) relative to 100 parts by mass of component (A) in layer (X1) formed from resin composition (x1)."

[0029] {Other ingredients} The resin composition (x1) may contain other components in addition to the components (A) and (B) and the optional component (C) as needed, as long as the effects of the present invention are exhibited. Examples of other components include resins other than component (A), tackifiers, surfactants, crosslinking agents, and fillers. Examples of resins other than component (A) include polyolefins such as polyethylene and polypropylene; copolymers of ethylene with an α-olefin having 3 to 20 carbon atoms; and ethylene-vinyl ester resins other than component (A). Furthermore, when the resin composition (x1) is used as an aqueous resin, the resin other than component (A) may contain water-soluble resins such as polyvinyl alcohol; sodium polyacrylate; and cellulose ether resins such as hydroxyethyl cellulose, carboxymethyl cellulose, and methyl cellulose, in order to improve the stability of the aqueous resin. Here, the term "aqueous resin" refers to a resin composition that uses water as the main medium (component) other than the solid content. Examples of aqueous resins include water-dispersed resins such as aqueous colloidal dispersions and aqueous emulsions; and water-soluble resins. Examples of tackifiers include rosin-based resins; terpene-based resins; petroleum resins and hydrogenated petroleum resins such as petroleum resins obtained by polymerizing a petroleum fraction having 5 carbon atoms and hydrogenated resins thereof, and petroleum resins obtained by polymerizing a petroleum fraction having 9 carbon atoms and hydrogenated resins thereof; dicyclopentadiene-based resins; coumarone-indene resins and hydrogenated resins thereof; and rosin-modified xylene resins. The surfactant may include known surfactants used in aqueous resins, such as nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. Examples of the crosslinking agent include an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, an aziridine-based crosslinking agent, a melamine resin, a urea resin, and a metal chelate-based crosslinking agent. Examples of fillers include clay such as kaolin, talc, and mica, alumina, zinc oxide, titanium oxide, silica, and calcium carbonate.

[0030] When the resin composition (x1) contains other components, the contents of the other components in the resin composition (x1) are not particularly limited as long as the effects of the present invention are exhibited independently. For example, the content of the other components in the resin composition (x1) is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, and still more preferably 2% by mass or more, relative to 100% by mass of the total solid content in the resin composition (x1). The content is also preferably 20% by mass or less, more preferably 18% by mass or less, even more preferably 15% by mass or less, and still more preferably 10% by mass or less. Furthermore, the total content of other components in the resin composition (x1) is not particularly limited as long as the effects of the present invention are exhibited. For example, based on 100% by mass of the total solid content in the resin composition (x1), the total content is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, still more preferably 2% by mass or more, and is preferably 35% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, still more preferably 20% by mass or less, and still more preferably 18% by mass or less.

[0031] The resin composition (x1) is preferably used as an aqueous resin, more preferably as an aqueous emulsion. There are no particular limitations on the method for producing the aqueous resin, and it can be produced using known methods such as aggregation and dispersion. For example, the aqueous resin can be obtained by emulsion polymerizing the component (A) in water and then mixing it with the component (B) and, if necessary, the component (C) and other components. Alternatively, for example, the resin composition (x1) can be added to water afterward, and mechanical energy can be applied to microparticulate the mixture. Alternatively, for example, the components constituting the resin composition (x1) can be added simultaneously or sequentially to water, and mechanical energy can be applied to microparticulate the resin composition (x1).

[0032] When the resin composition (x1) is an aqueous resin, the resin composition (x1) contains water. The water is not particularly limited as long as the effects of the present invention are exhibited, and tap water, deionized water, etc. can be used. When the resin composition (x1) contains water, the content of water in the resin composition (x1) is not particularly limited as long as the effects of the present invention are exhibited. For example, from the viewpoint of stability and handleability of the aqueous resin, the content of water is preferably 80 parts by mass or more, more preferably 90 parts by mass or more, even more preferably 100 parts by mass or more, still more preferably 105 parts by mass or more, relative to 100 parts by mass of the total solid content in the resin composition (x1), and is preferably 250 parts by mass or less, more preferably 225 parts by mass or less, even more preferably 200 parts by mass or less, and still more preferably 195 parts by mass or less.

[0033] The resin composition (x1) may contain an organic solvent as a diluent, if necessary. The organic solvent is not particularly limited as long as the effects of the present invention are exhibited, but examples thereof include aromatic hydrocarbons such as toluene, aliphatic hydrocarbons such as hexane, esters such as ethyl acetate, ketones such as acetone and methyl ethyl ketone, and alcohols such as ethanol. Furthermore, when the resin composition (x1) contains an organic solvent, the content of the organic solvent in the resin composition (x1) is, for example, preferably 0.01 parts by mass or more and preferably 3 parts by mass or less, more preferably 2 parts by mass or less, even more preferably 1 part by mass or less, and still more preferably 0.5 parts by mass or less, relative to 100 parts by mass of the total solid content in the resin composition (x1).

[0034] The solid content of the resin composition (x1) is not particularly limited as long as the layer (X1) can be formed and the effects of the present invention are exhibited. For example, in one embodiment of the resin composition (x1) that can be used in the present invention, when the resin composition (x1) is an aqueous resin, the solid content is preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and is preferably 70% by mass or less, even more preferably 60% by mass or less, and even more preferably 55% by mass or less, based on 100% by mass of the resin composition (x1).

[0035] The thickness of the layer (X1) is appropriately selected depending on the application of the pressure-sensitive adhesive label, but from the viewpoints of enabling the substrate to be separated from the laminate without requiring an unnecessarily high force and facilitating more stable cohesive failure within the layer (X1), it is preferably 2 μm or more, more preferably 3 μm or more, even more preferably 4 μm or more, and still more preferably 5 μm or more. Furthermore, from the viewpoints of preventing unstable cohesive failure within the layer (X1) and enabling the thickness and weight of the entire pressure-sensitive adhesive label to be thin and lightweight, it is preferably 25 μm or less, more preferably 20 μm or less, even more preferably 15 μm or less, still more preferably 10 μm or less, and still more preferably 8 μm or less. Here, "thickness of the first resin layer (X1)" means the thickness of the entire layer (X1), and for example, the thickness of a layer (X1) consisting of multiple layers means the total thickness of all layers constituting the layer (X1).

[0036] (Second resin layer (X2)) The second resin layer (X2) is formed from a resin composition (x2) containing a urethane resin (U) (hereinafter also referred to as "component (U)"). By having the layer (X2), when the release liner is peeled off from the adhesive label at high speed, the layer (X2) disperses and absorbs the impact that occurs during high-speed peeling, thereby reducing the load on the layer (X1) and preventing lifting. Furthermore, by having the layer (X2), the pressure-sensitive adhesive label can prevent stickiness caused by the layer (Z) after the layer (X1) has undergone cohesive failure. In addition, from the viewpoint of facilitating the occurrence of cohesive failure in the layer (X1), the cohesive force of the layer (X2) is preferably stronger than the cohesive force of the layer (X1).

[0037] [Resin composition (x2)] The resin composition (x2) contains the component (U). When the resin composition (x2) contains the component (U), as described above, when the release liner is peeled off from the pressure-sensitive adhesive label at high speed, the layer (X2) can disperse and absorb the impact during high-speed peeling. Hereinafter, each component contained in the resin composition (x2) that forms the layer (X2) will be described. In the present invention, the "content of each component in 100% by mass of the total solid content of the resin composition (x2)" can also be considered as the "content of each component in the layer (X2) formed from the resin composition (x2)."

[0038] {Urethane resin (U)} Examples of the urethane resin (U) contained in the resin composition (x2) include resins obtained by a reaction such as a polyaddition reaction between a polyisocyanate compound having an isocyanate group and a compound having an active hydrogen group such as a hydroxyl group or an amine.

[0039] Examples of the polyisocyanate compound are not particularly limited as long as the effects of the present invention are exhibited, and include known aromatic polyisocyanates, aliphatic polyisocyanates, alicyclic polyisocyanates, and the like.

[0040] Examples of aromatic polyisocyanates include 1,3-phenylene diisocyanate, 4,4'-diphenyl diisocyanate, 1,4-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate (MDI), 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), 4,4'-toluidine diisocyanate, 2,4,6-triisocyanate toluene, and 1,3,5-triisocyanate. diisocyanate, dianisidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4',4"-triphenylmethane triisocyanate, ω,ω'-diisocyanate-1,3-dimethylbenzene, ω,ω'-diisocyanate-1,4-dimethylbenzene, ω,ω'-diisocyanate-1,4-diethylbenzene, 1,4-tetramethylxylylene diisocyanate, and 1,3-tetramethylxylylene diisocyanate.

[0041] Examples of aliphatic polyisocyanates include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HMDI), pentamethylene diisocyanate, 1,2-propylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate.

[0042] Examples of the aromatic aliphatic polyisocyanate include ω,ω'-diisocyanate-1,3-dimethylbenzene, ω,ω'-diisocyanate-1,4-dimethylbenzene, ω,ω'-diisocyanate-1,4-diethylbenzene, 1,4-tetramethylxylylene diisocyanate, and 1,3-tetramethylxylylene diisocyanate.

[0043] Examples of alicyclic polyisocyanates include 3-isocyanatemethyl-3,5,5-trimethylcyclohexyl isocyanate (IPDI), 1,3-cyclopentane diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, methyl-2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), 1,4-bis(isocyanatemethyl)cyclohexane, and 1,4-bis(isocyanatemethyl)cyclohexane.

[0044] The polyisocyanate compound can be used in combination with a trimethylolpropane adduct of the polyisocyanate compound, a biuret product obtained by reacting with water, or a trimer having an isocyanurate ring.

[0045] Examples of the compound having an active hydrogen group are not particularly limited as long as the effects of the present invention are exhibited, and include polyol compounds. The polyol compound is not particularly limited as long as it is a compound having two or more hydroxy groups. Specific examples of the polyol compound include alkanediols, alkylene glycols, polyether-type polyols, polyester-type polyols, and polycarbonate-type polyols. The polyol compound may be any of a difunctional diol, a trifunctional triol, and a polyol having four or more functional groups.

[0046] Examples of alkanediols include 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol. Examples of alkylene glycols include ethylene glycol, propylene glycol, diethylene glycol, and dipropylene glycol.

[0047] As the polyether polyol, a known polyether polyol can be used. For example, a polyether polyol obtained by polymerizing an oxirane compound such as ethylene oxide, propylene oxide, butylene oxide, or tetrahydrofuran using a low-molecular-weight polyol such as water, propylene glycol, ethylene glycol, glycerin, or trimethylolpropane as an initiator can be used. Examples of the polyether polyol include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polybutylene glycol, and polyoxyalkylene glycols such as polytetramethylene glycol.

[0048] Known polyester polyols are used as the polyester polyol. Polyester polyols are esters of an acid component with at least one of a glycol component and a polyol component. Examples of the acid component include terephthalic acid, adipic acid, azelaic acid, sebacic acid, phthalic anhydride, isophthalic acid, and trimellitic acid. Examples of the glycol component include ethylene glycol, propylene glycol, diethylene glycol, butylene glycol, 1,6-hexane glycol, 3-methyl-1,5-pentanediol, 3,3'-dimethylolheptane, polyoxyethylene glycol, polyoxypropylene glycol, 1,4-butanediol, neopentyl glycol, and butylethylpentanediol. Examples of the polyol component include glycerin, trimethylolpropane, and pentaerythritol. Other examples include polyester polyols obtained by ring-opening polymerization of lactones such as polycaprolactone, poly(β-methyl-γ-valerolactone), and polyvalerolactone.

[0049] The polycarbonate type polyol is not particularly limited, and examples thereof include the reaction products of the above-mentioned glycols and alkylene carbonates.

[0050] Examples of the urethane resin (U) include polyether-based polyurethanes, polyester-based polyurethanes, polycarbonate-based polyurethanes, and polyolefin-based polyurethanes, each having a structure derived from the polyether-based polyol, polyester-based polyol, polycarbonate-based polyol, or the like. One embodiment of the urethane resin (U) may be a block copolymer containing a hard segment formed from a diisocyanate and a short-chain diol and a soft segment formed mainly from a diisocyanate and a long-chain polyol, or may be a thermoplastic urethane resin. One embodiment of the urethane resin (U) is preferably a thermoplastic urethane resin.

[0051] The urethane resin (U) may be a compound obtained by further reacting the above-mentioned polyisocyanate compound and polyol compound with a diamine such as ethylenediamine, N-aminoethylethanolamine, isophoronediamine, xylylenediamine, etc. Furthermore, in addition to the above-mentioned polyol compounds, neopentyl glycol, butylethylpentanediol, glycerin, trimethylolpropane, pentaerythritol, etc. may also be used as the polyol compound.

[0052] The urethane resin (U) is not limited to those mentioned above, and may be, for example, a Michael addition type urethane polymer. Examples of the Michael addition type urethane polymer include the following (1) and (2). (1) A urethane prepolymer having an isocyanate group (-NCO) at its terminal, obtained by reacting the polyol compound with a polyisocyanate compound, is reacted with an amino compound obtained by subjecting a polyamine to a Michael addition reaction with an unsaturated compound. (2) A polyurethane urea obtained by reacting the above polyol compound, polyisocyanate compound, and polyamine, and having a primary or secondary amino group at the terminal, with an unsaturated compound by Michael addition reaction.

[0053] The polyamine used in the Michael addition type urethane polymer may be a known one, and specific examples thereof include aliphatic polyamines such as ethylenediamine, propylenediamine, trimethylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, triethylenetetramine, diethylenetriamine, triaminopropane, 2,2,4-trimethylhexamethylenediamine, tolylenediamine, hydrazine, and piperazine; alicyclic polyamines such as isophoronediamine and dicyclohexylmethane-4,4'-diamine; and aromatic polyamines such as phenylenediamine and xylylenediamine. Furthermore, diamines having a hydroxyl group in the molecule such as 2-hydroxyethylethylenediamine, N-(2-hydroxyethyl)propylenediamine, (2-hydroxyethylpropylene)diamine, (di-2-hydroxyethylethylene)diamine, (di-2-hydroxyethylpropylene)diamine, (2-hydroxypropylethylene)diamine, (di-2-hydroxypropylethylene)diamine, dimer diamines in which the carboxyl groups of dimer acid are converted to amino groups, and polyoxyalkylene glycol diamines having propoxyamine at both ends and represented by the following general formula (I) can also be used. H2-NCH2-CH2-CH2-O(C n H 2n -O) m -CH2-CH2-CH2-NH2(I) (In formula (I), n represents an arbitrary integer of 2 to 4, and m represents an arbitrary integer of 2 to 50.) Furthermore, a dendrimer having a primary or secondary amino group at the terminal can also be used as the polyamine.

[0054] The unsaturated compound used in the Michael addition urethane polymer is used for the purpose of modifying the urethane polymer. Therefore, the type of unsaturated compound used can be selected arbitrarily depending on the purpose of modification. Examples of unsaturated compounds include (meth)acrylic unsaturated compounds, amide unsaturated compounds, fatty acid vinyl unsaturated compounds, vinyl ether unsaturated compounds, α-olefin unsaturated compounds, allyl unsaturated compounds, allyl acetate unsaturated compounds, vinyl cyanide unsaturated compounds, styrene or vinyl benzene unsaturated compounds, etc. The type of unsaturated compound to be used can be arbitrarily selected depending on the purpose of modification, but it is preferable to select it by focusing on the functional group that the unsaturated compound has.The functional group that such unsaturated compound has can be exemplified by alkyl group, polyalkylene glycol group, alkoxy group, phenoxy group, hydroxyl group, carboxyl group, perfluoroalkyl group, alkoxysilyl group, epoxy group, and further nitrogen-containing group such as amide group, dialkylamino group, quaternary ammonium base, etc.

[0055] In the polyaddition reaction of the urethane resin (U), a chain extender or a terminal terminator may be used as needed, i.e., the urethane resin (U) may have a structure derived from the chain extender or the terminal terminator.

[0056] The chain extender is not particularly limited, and any known chain extender used in the production of urethane resins can be used. Examples include a compound having two groups of one or two types selected from hydroxyl groups and amino groups; a compound having three or more groups of one or two types selected from hydroxyl groups and amino groups; and the like.

[0057] Examples of the compound having two of one or two types of groups selected from a hydroxyl group and an amino group include at least one compound selected from the group consisting of an aliphatic diol, an aliphatic diamine, an alkanolamine, a bisphenol, and an aromatic diamine. Examples of aliphatic diols include alkanediols such as 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, and 1,7-heptanediol, and alkylene glycols such as ethylene glycol, propylene glycol, diethylene glycol, and dipropylene glycol. Examples of the aliphatic diamine include ethylenediamine, 1,3-propanediamine, 1,4-butanediamine, 1,5-pentanediamine, and 1,6-hexanediamine. Examples of alkanolamines include monoethanolamine, monopropanolamine, and isopropanolamine. An example of the bisphenol is bisphenol A. Examples of aromatic diamines include diphenylmethanediamine, tolylenediamine, and xylylenediamine.

[0058] Examples of the compound having three or more groups of one or two types selected from hydroxyl groups and amino groups include polyols such as trimethylolpropane, ditrimethylolpropane, pentaerythritol, and dipentaerythritol; aminoalcohols such as 1-amino-2,3-propanediol, 1-methylamino-2,3-propanediol, and N-(2-hydroxypropylethanolamine); and ethylene oxide or propylene oxide adducts of tetramethylxylylenediamine.

[0059] The terminal terminator is not particularly limited, and any known terminal terminator used in the production of urethane resins can be used, such as a compound having only one hydrogen atom capable of reacting with an isocyanate group or a compound having only one amino group. Examples of compounds having only one hydrogen atom capable of reacting with an isocyanate group include monool compounds such as methanol and ethanol. Examples of compounds having only one amino group include compounds having a primary amino group or a secondary amino group, such as diethylamine and morpholine. A compound having one primary amino group has two reactive hydrogens, but the reactive hydrogen that remains after one reactive hydrogen has reacted has low reactivity, so it is essentially equivalent to a monofunctional compound.

[0060] As will be described later, it is preferable to use the resin composition (x2) as an aqueous resin. When the resin composition (x2) is used as an aqueous resin, for example, the aqueous resin can be obtained by a forced emulsification method in which the urethane resin (U) is forcibly emulsified using a surfactant, or a self-emulsification method or a water-solubilization method in which a hydrophilic group or a hydrophilic segment is directly introduced into the polymer skeleton of the urethane resin (U) to emulsify it. The surfactant used in the forced emulsification method can be a known surfactant used in aqueous resins, such as a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, etc. When the urethane resin (U) is dispersed in water using the forced emulsification method, a hydrophilic group or a hydrophilic segment may be directly introduced into the polymer skeleton.

[0061] The self-emulsifying aqueous urethane resin and the water-soluble aqueous urethane resin can be obtained as an aqueous polyurethane having ionicity such as cationic, anionic, or nonionic, depending on the type of hydrophilic group, such as a cationic group, anionic group, or nonionic group, introduced into the polymer skeleton. Examples of the anionic group include a carboxy group, a carboxylate group, a sulfonic acid group, and a sulfonate group. Examples of the cationic group include a substituted or unsubstituted amino group. Examples of the nonionic group include a polyoxyalkylene group. The hydrophilic group may be introduced into one or both of the terminal and side chain of the polymer.

[0062] When the urethane resin (U) has the anionic groups, some or all of the anionic groups may be neutralized with a basic compound, etc. Examples of the basic compound include organic amines such as ammonia, triethylamine, morpholine, monoethanolamine, and diethylethanolamine; and metal hydroxides including sodium hydroxide, potassium hydroxide, and lithium hydroxide.

[0063] When the urethane resin (U) has the cationic groups, some or all of the cationic groups may be neutralized with an acidic compound, etc. Examples of the acidic compound include carboxylic acids such as formic acid, acetic acid, propionic acid, lactic acid, maleic acid, succinic acid, glutaric acid, and adipic acid; hydroxy acids such as tartaric acid; organic sulfonic acids such as sulfonic acid and methanesulfonic acid; and inorganic acids such as hydrochloric acid, sulfuric acid, orthophosphoric acid, and orthophosphorous acid. When the urethane resin (U) has the cationic group, the cationic group may be a tertiary amino group, and some or all of the tertiary amino groups may be quaternized with a quaternizing agent, etc. Examples of the quaternizing agent include dialkyl sulfates such as dimethyl sulfate and diethyl sulfate; alkyl halides such as methyl chloride, ethyl chloride and benzyl chloride; alkylating agents such as methyl methanesulfonate and methyl p-toluenesulfonate; and epoxy compounds such as ethylene oxide, propylene oxide and epichlorohydrin.

[0064] Examples of the polyoxyalkylene group that is the nonionic group include a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, a poly(oxyethylene-oxypropylene) group, and a polyoxyethylene-polyoxypropylene group.

[0065] The content of component (U) in resin composition (x2) is, relative to 100% by mass of the total solid content in resin composition (x2), preferably 50% by mass or more, more preferably 55% by mass or more, even more preferably 60% by mass or more, and still more preferably 65% ​​by mass or more, and is preferably 100% by mass or less, more preferably 99% by mass or less, and even more preferably 98% by mass or less.

[0066] Furthermore, the resin composition (x2) may further contain, if necessary, the fatty acid metal salt (B) explained in the section on the resin composition (x1), as long as the effects of the present invention are exhibited. In the resin composition (x2), the content of component (B) is preferably less than 70 parts by mass, more preferably 50 parts by mass or less, even more preferably 30 parts by mass or less, still more preferably 10 parts by mass or less, still more preferably 5 parts by mass or less, still more preferably 1 part by mass or less, still more preferably 0.1 parts by mass or less, per 100 parts by mass of component (A). In this specification, the aforementioned "content of component (B) per 100 parts by mass of component (A) in resin composition (x2)" can also be considered as "content of component (B) per 100 parts by mass of component (A) in layer (X2) formed from resin composition (x2)."

[0067] {Other ingredients} The resin composition (x2) may contain other components in addition to the component (U) as needed, as long as the effects of the present invention are exhibited. The other components are, for example, the same as the other components that may be contained in the resin composition (x1).

[0068] When the resin composition (x2) contains other components, the contents of the other components in the resin composition (x2) are not particularly limited as long as the effects of the present invention are exhibited independently. For example, the content of the other components in the resin composition (x2) is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, and still more preferably 2% by mass or more, relative to 100% by mass of the total solid content in the resin composition (x2). The content is also preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less. The total content of other components in the resin composition (x2) is not particularly limited as long as the effects of the present invention are exhibited. For example, the total content of other components in the resin composition (x2), relative to 100% by mass of the total solid content in the resin composition (x2), is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, and still more preferably 2% by mass or more, and is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less.

[0069] The resin composition (x2) is preferably used as an aqueous resin. Examples of the aqueous resin include water-dispersed resins such as aqueous colloidal dispersions and aqueous emulsions; and water-soluble resins. The production method for making the resin composition (x2) into an aqueous resin is not particularly limited as long as the effects of the present invention are exhibited. For example, as described above, commonly known production methods for producing aqueous polyurethane resins include a forced emulsification method in which the urethane resin (U) is forcibly emulsified using a surfactant, and a self-emulsification method or a water-solubilization method in which a hydrophilic group or a hydrophilic segment is directly introduced into the polymer skeleton to emulsify the resin. Examples of forced emulsification methods include a method in which a surfactant is added to a urethane resin polymerized in a solution, and the resulting mixture is dispersed in water using mechanical shearing force, followed by removal of the solvent; a method in which a prepolymer having a terminal isocyanate group is dispersed in water using a surfactant and mechanical shearing force, and then polymerized using a chain extender; and a method in which a polymer in which the terminal isocyanate group has been blocked with a blocking agent is used as the prepolymer. As described above, an example of the self-emulsification method is a method in which hydrophilic groups are introduced into a urethane resin to impart hydrophilicity to the urethane resin itself, and the urethane resin is dispersed or dissolved in water by self-emulsification. Known methods include the acetone method and the prepolymer mixing method. Examples of the water-solubilizing method include a method in which a water-soluble polyol compound such as a hydrophilic group, polyethylene glycol, or monoalkoxypolyethylene glycol is used as the polyol compound, which is the main raw material of the urethane resin, and the resulting water-soluble aqueous urethane resin is dispersed or dissolved in water.

[0070] When the resin composition (x2) is an aqueous resin, the resin composition (x2) contains water. The water is not particularly limited as long as the effects of the present invention are exhibited, and tap water, deionized water, etc. can be used. When the resin composition (x2) contains water, the content of water in the resin composition (x2) is not particularly limited as long as the effects of the present invention are exhibited. For example, from the viewpoint of stability and handleability of the aqueous resin, the content of water is preferably 60 parts by mass or more, more preferably 70 parts by mass or more, and even more preferably 80 parts by mass or more, relative to 100 parts by mass of the total solid content in the resin composition (x2), and is preferably 250 parts by mass or less, more preferably 200 parts by mass or less, and even more preferably 150 parts by mass or less.

[0071] The resin composition (x2) may contain an organic solvent as a diluent, if necessary. The organic solvent is not particularly limited as long as the effects of the present invention are exhibited, but examples thereof include aromatic hydrocarbons such as toluene, aliphatic hydrocarbons such as hexane, esters such as ethyl acetate, ketones such as acetone and methyl ethyl ketone, and alcohols such as ethanol. When the resin composition (x2) contains an organic solvent, the content of the organic solvent in the resin composition (x1) is, for example, preferably 0.01 parts by mass or more, preferably 3 parts by mass or less, and more preferably 2.5 parts by mass or less, relative to 100 parts by mass of the total solid content in the resin composition (x2).

[0072] The solid content of the resin composition (x2) is not particularly limited as long as the layer (X2) can be formed and the effects of the present invention are exhibited. For example, in one embodiment of the resin composition (x2) that can be used in the present invention, when the resin composition (x2) is an aqueous resin, the solid content is preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and is preferably 70% by mass or less, even more preferably 65% ​​by mass or less, and even more preferably 60% by mass or less, based on 100% by mass of the resin composition (x2).

[0073] As the resin composition (x2), commercially available products may be used, such as the "BONDIC (registered trademark)" series, "HYDRAN (registered trademark)" series, and "CRISBON (registered trademark)" series manufactured by DIC Corporation; the "WBR" series manufactured by Taisei Fine Chemical Co., Ltd.; the "MERCI (registered trademark)" series and "RUBILAC (registered trademark)" series manufactured by Toyo Polymer Co., Ltd.; the "ETERNACOLL (registered trademark) UW" series manufactured by Ube Industries, Ltd.; the "PUE" series manufactured by Murayama Chemical Laboratory Co., Ltd.; and the "LEZAMINE (registered trademark)" series manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd.

[0074] The thickness of the layer (X2) is appropriately selected depending on the application of the pressure-sensitive adhesive label, but from the viewpoint of enabling the layer (Z) to be supported more stably and making it easier to suppress the occurrence of lifting, it is preferably 2 μm or more, more preferably 3 μm or more, even more preferably 4 μm or more, still more preferably 5 μm or more, and still more preferably 6 μm or more. Also, from the viewpoint of making the thickness of the entire pressure-sensitive adhesive label thinner and lighter, it is preferably 25 μm or less, more preferably 20 μm or less, even more preferably 15 μm or less, still more preferably 10 μm or less, and still more preferably 8 μm or less. Here, "thickness of the second resin layer (X2)" means the thickness of the entire layer (X2), and for example, the thickness of a layer (X2) consisting of multiple layers means the total thickness of all layers that make up the layer (X2).

[0075] Furthermore, from the viewpoint of more stably causing cohesive failure within the layer (X1), the ratio of the thickness (X2t) of the layer (X2) to the thickness (X1t) of the layer (X1) [(X2t) / (X1t)] is preferably 0.3 or more, more preferably 0.8 or more, even more preferably 0.9 or more, still more preferably 1.0 or more, still more preferably 1.1 or more, and is preferably 3.0 or less, more preferably 2.5 or less, even more preferably 2.0 or less, still more preferably 1.5 or less.

[0076] <Adhesive layer (Z)> The adhesive layer (Z) is a layer for adhering the adhesive label to an object to be adhered, and is appropriately selected depending on the application of the adhesive label. Examples of the adhesive (z) forming the adhesive layer (Z) include adhesives such as acrylic adhesives, urethane adhesives, polyester adhesives, natural rubber adhesives, synthetic rubber adhesives, and silicone adhesives. Also included are curable adhesives that are cured by a combination of one or two methods selected from heating and energy rays. In this specification, "energy rays" refers to electromagnetic waves or charged particle beams that have an energy quantum, and examples thereof include ultraviolet rays, radioactive rays, and electron beams. Among these, acrylic pressure-sensitive adhesives are preferably used from the viewpoints of weather resistance and cost. Examples of the pressure-sensitive adhesive include solvent-based pressure-sensitive adhesives, hot-melt-based pressure-sensitive adhesives, and aqueous emulsion-based pressure-sensitive adhesives. Examples of the acrylic adhesive include aqueous resin type acrylic adhesives such as aqueous emulsion type acrylic resins; solvent type acrylic adhesives; and hot melt type acrylic adhesives.

[0077] The thickness of the layer (Z) is appropriately selected depending on the use of the adhesive label, but is preferably 1 to 50 μm, more preferably 5 to 50 μm, even more preferably 10 to 40 μm, still more preferably 10 to 30 μm, and even more preferably 10 to 20 μm.

[0078] <Release liner> The pressure-sensitive adhesive label further has a release liner on the surface of the layer (Z) opposite to the layer (X). The release liner is not particularly limited, and examples thereof include release liners with one-side release treatment and release liners with both-side release treatment, and examples thereof include a release liner substrate coated with a release agent. Examples of substrates for the release liner include papers such as fine paper, glassine paper, and kraft paper; plastic films such as polyester resin films such as polyethylene terephthalate resin, polybutylene terephthalate resin, and polyethylene naphthalate resin; and olefin resin films such as polypropylene resin and polyethylene resin. Examples of the release agent include rubber elastomers such as silicone resins, olefin resins, isoprene resins, and butadiene resins, long-chain alkyl resins, alkyd resins, and fluorine-based resins.

[0079] The thickness of the release liner is appropriately selected depending on the application of the adhesive label, but is preferably 10 to 200 μm, more preferably 20 to 150 μm, even more preferably 25 to 100 μm, still more preferably 30 to 80 μm, and even more preferably 35 to 50 μm.

[0080] [Manufacturing method of adhesive labels] The method for producing the pressure-sensitive adhesive label is not particularly limited as long as it can produce a pressure-sensitive adhesive label having a structure in which a substrate (Y), a layer (X), a layer (Z), and a release liner are arranged in this order, the layer (X) being a layer formed from the layer (X1) and the layer (X2), and the layer (X1) and the layer (X2) are arranged in this order from the substrate (Y) side. For example, the method described below can be mentioned. In the following description, the case of manufacturing an example of the configuration of the pressure-sensitive adhesive label shown in FIG. 1 will be mainly described as an example.

[0081] One embodiment of the method for producing the adhesive label 10 shown in FIG. 1 includes, for example, a method for producing an adhesive label including the following steps (S1) to (S4) in this order and further including the following step (S5). Step (S1): A step of applying a resin composition (x1) containing an ethylene-vinyl acetate resin (A) and a fatty acid metal salt (B) onto one surface of a substrate (Y) to form a coating film (x1f). Step (S2): A step of drying the coating film (x1f) to form a first resin layer (X1) Step (S3): A step of applying a resin composition (x2) containing a urethane resin (U) to the surface of the first resin layer (X1) opposite to the substrate (Y) to form a coating film (x2f). Step (S4): A step of drying the coating film (x2f) to form a second resin layer (X2) Step (S5): Step of forming a pressure-sensitive adhesive layer (Z) and a release liner on the surface of the second resin layer (X2) opposite to the substrate (Y). By carrying out the steps (S1) to (S4) in this order to form each layer in this order, and then carrying out the step (S5) to form the layer (Z) and a release liner, it is possible to produce a pressure-sensitive adhesive label having the substrate (Y), the layer (X1), the layer (X2), the layer (Z), and the release liner in this order.

[0082] Step (S5) preferably includes the following steps (S6) and (S7) in this order. Step (S6): A step of applying a pressure-sensitive adhesive (z) to the surface of the release liner on which the release agent is provided to form a coating film (zf), and, if necessary, drying the coating film (zf) to form a pressure-sensitive adhesive layer (Z). Step (S7): A step of laminating the surface of the second resin layer (X2) opposite the substrate (Y) to the surface of the pressure-sensitive adhesive layer (Z) opposite the release liner.

[0083] In an embodiment in which step (S5) includes step (S6) and step (S7) in this order, steps (S1) to (S4) are carried out in this order, and further step (S6) and step (S7) are carried out in this order to form each layer, thereby making it possible to produce a pressure-sensitive adhesive label having the substrate (Y), layer (X1), layer (X2), layer (Z), and release liner in this order. Here, either the steps (S1) to (S4) or the step (S6) may be performed first, but the step (S7) is performed after the steps (S4) and (S6). For example, in a case where step (S5) includes step (S6) and step (S7), and step (S6) is performed after step (S4), one embodiment of the method for producing an adhesive label is a method for producing an adhesive label that includes steps (S1), (S2), (S3), (S4), (S6), and (S7) in this order. Furthermore, in an embodiment in which step (S5) includes step (S6) and step (S7), and step (S6) is performed before step (S4), one embodiment of the method for producing the adhesive label includes steps (S1) to (S4) in this order, and includes step (S6) before step (S1), or between steps (S1) and (S2), or between steps (S2) and (S3), or between steps (S3) and (S4), and further includes step (S7) after step (S4). The release liners used in steps (S6) and (S7) are the same as those described above. Furthermore, the method for producing the pressure-sensitive adhesive label may include only the steps (S1) to (S4) and the step (S5) (including steps (S6) to (S9)), or may further include other steps.

[0084] Another embodiment of the step (S5) may be, for example, a step including the following steps (S8) and (S9) in this order. Step (S8): A step of applying a pressure-sensitive adhesive (z) to the surface of the second resin layer (X2) opposite to the substrate (Y) to form a coating film (zf), and, if necessary, drying the coating film (zf) to form a pressure-sensitive adhesive layer (Z). Step (S9): A step of further providing a release liner on the surface of the pressure-sensitive adhesive layer (Z) opposite to the substrate (Y). When the step (S5) is a step including the steps (S8) and (S9) in this order, the steps (S1) to (S4) are included in this order, and after the step (S4), the steps (S8) and (S9) are further carried out in this order to form each layer, thereby making it possible to produce a pressure-sensitive adhesive label having the substrate (Y), layer (X1), layer (X2), layer (Z), and release liner in this order. The release liners used in steps (S8) and (S9) are the same as those described above.

[0085] In the steps (S5), (S6), and (S8), when the pressure-sensitive adhesive (z) is used after being diluted with a diluting solvent such as an organic solvent to form the coating film (zf), or when a pressure-sensitive adhesive (z) containing a diluting solvent in advance is used, the coating film (zf) is dried as necessary to form the pressure-sensitive adhesive layer (Z). Also, when the pressure-sensitive adhesive (z) is an adhesive that can be used without drying, for example, when an adhesive that can form the coating film (zf) by heating and melting, such as a hot-melt type pressure-sensitive adhesive, is used, the formed coating film (zf) becomes the pressure-sensitive adhesive layer (Z).

[0086] In steps (S1), (S3), (S5), (S6), and (S8), the resin composition (x1), the resin composition (x2), and the adhesive (z) are applied to form the coating film (x1f), the coating film (x2f), and the coating film (zf), respectively. Known methods can be used independently. Examples of such methods include methods using various coaters such as a spray coater, an air knife coater, a blade coater, a bar coater, a gravure coater, a roll coater, a roll knife coater, a curtain coater, a die coater, a knife coater, a screen coater, a Mayer bar coater, and a kiss coater.

[0087] Furthermore, the drying temperature when drying the coating film (x1f), coating film (x2f), and coating film (zf) is not particularly limited as long as the layer (X1), layer (X2), and layer (Z) can be formed. Suitable examples of the drying temperature for each coating film are each independently preferably 50 to 140°C, more preferably 60 to 120°C, and even more preferably 65 to 110°C. As for the drying method, a known drying method such as a method using an oven can be used.

[0088] As described above, the method for producing the pressure-sensitive adhesive label is not particularly limited to the method for producing the pressure-sensitive adhesive label described above. In addition to the coating method, methods for forming the coating films that form the above-described layers include a dipping method, a spraying method, and the like. Among these, the above-described coating method is preferred from the viewpoint of productivity. Furthermore, the resulting coating film may be subjected to not only a drying treatment but also a curing treatment such as heat curing or energy ray curing to form each layer.

[0089] Furthermore, since the obtained adhesive label has a release liner, the adhesive label may be punched, and for example, multiple punched adhesive labels (each layer excluding the release liner) may be provided on one release liner. Furthermore, if necessary, the adhesive label may further have half-cut lines formed in the base material (Y) to separate the base material (Y) into a plurality of pieces.

[0090] [Applications for adhesive labels] The adhesive label is used, for example, as a delivery slip. That is, the adhesive label is preferably a delivery slip label. Specifically, half-cut lines are formed in the substrate (Y) of the adhesive label, and the substrate (Y) is separated into multiple pieces to make them peelable. One piece of the substrate (Y) separated by the half-cut line is used as a delivery slip, and the other piece of the substrate (Y) is used as a receipt. The adhesive label is attached to an adherend such as a cardboard box before the receipt is peeled off, and is used for delivery. In addition, the receipt is usually peeled off after being stamped or signed by the recipient, and is taken away by the delivery company and used for organizing the delivery slips, etc. [Example]

[0091] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Note that the physical properties in the following production examples and examples are values ​​measured and evaluation results obtained by the following methods.

[0092] <Thicknesses of the substrate (Y), cohesive failure layer (X), first resin layer (X1), second resin layer (X2), pressure-sensitive adhesive layer (Z), and release liner> The thicknesses of the substrate (Y), first resin layer (X1), second resin layer (X2), pressure-sensitive adhesive layer (Z), and release liner used in each example and comparative example were measured using a constant pressure thickness measuring instrument (model number: "PG-02J") manufactured by Teclock Corporation. The thickness of the cohesive failure layer (X) was calculated as the sum of the measured values ​​of the first resin layer (X1) and the second resin layer (X2).

[0093] <Lifting of the cohesive failure layer (X)> The effect of suppressing lifting of the cohesive failure layer (X) when the release liner of the adhesive label is peeled off at high speed was evaluated using the following method. Procedure (1): The adhesive labels produced in the examples and comparative examples were cut into a size of 150 mm in length (MD direction) x 50 mm in width (TD direction) to prepare test samples. Step (2): After step (2), the release liner was peeled from the surface of the adhesive layer (Z) at a peeling speed of 100 m / min using a high-speed peel tester (manufactured by Tester Sangyo Co., Ltd.) in an environment of 23°C and 50% RH (relative humidity), and the occurrence of lifting of the cohesive failure layer (X) was confirmed and evaluated according to the following criteria. "A": No lifting of the cohesive failure layer (X) occurred. · "F": Lifting of the cohesive failure layer (X) occurred.

[0094] <Adhesive strength> The adhesive strength when peeling the substrate (Y) from the adhesive label by causing cohesive failure of the first resin layer (X1) was measured using the following method. Procedure (1): The adhesive labels produced in the examples and comparative examples were cut into a size of 150 mm in length (MD direction) x 25 mm in width (TD direction), and the release liner on the adhesive layer (Z) was removed to prepare test samples. Procedure (2): In an environment of 23°C and 50% RH (relative humidity), the surface of the exposed pressure-sensitive adhesive layer (Z) of the test sample was pressed against a stainless steel plate using a 2 kg rubber roll in accordance with JIS Z0237:2000 by moving the rubber roll back and forth once, and the plate was left to stand in the same environment for 20 minutes. Step (3): After step (2), the peel force when peeling the substrate (Y) and the first resin layer (X1) was measured at a tension speed (peel speed) of 300 mm / min by the 180° peel method based on JIS Z0237:2000 under an environment of 23°C and 50% RH (relative humidity). The measurement result was taken as the adhesive strength when peeling the substrate (Y) from the adhesive label by causing cohesive failure of the first resin layer (X1).

[0095] <Stickyness evaluation> After the evaluation of adhesive strength, the test sample was checked for stickiness by touching the peeled surface of the adhesive label side exposed by peeling the substrate (Y) with a finger.

[0096] <Observation of peeled surface> After the adhesive strength evaluation, the peeled surface of the substrate (Y) peeled from the adhesive label side of the test sample was observed using a scanning electron microscope (manufactured by Hitachi, Ltd., product name "S-4700").

[0097] <Manufacturing of adhesive labels> An adhesive label was produced by the following method. The abbreviations used in the explanation of each example to represent each component are as follows: - "EVA-1": A water-based emulsion (solid content: 45% by mass) containing ethylene-vinyl acetate resin and calcium stearate. Ethylene-vinyl acetate resin (component (A)) content: 33.3 mass% out of 100 mass% solids. Content of calcium stearate (component (B)): 133 parts by mass per 100 parts by mass of ethylene-vinyl acetate resin. Content of paraffin wax resin (component (C)): 20 parts by mass per 100 parts by mass of ethylene-vinyl acetate resin. Rosin resin content: 20 parts by mass per 100 parts by mass of ethylene-vinyl acetate resin. - "EVA-2": A water-based emulsion containing ethylene-vinyl acetate resin (solid content: 47.5% by mass). Ethylene-vinyl acetate resin (component (A)) content: 73.7 mass% based on 100 mass% solids. Content of solid paraffin (component (C)): 35.7 parts by mass per 100 parts by mass of ethylene-vinyl acetate resin. "PU-1": Product name "Bondic (registered trademark) 1310NE" manufactured by DIC Corporation. A water-based resin containing a polyether-based urethane resin (solid content: 50% by mass). "PU-2": Product name "Hydran (registered trademark) HW-311" manufactured by DIC Corporation. Water-based resin containing urethane resin (solid content: 45% by mass). "Acrylic-1": Acrylic adhesive "Acrylic-2": Product name "Boncoat (registered trademark) CG-6150" manufactured by DIC Corporation. Water-based emulsion type acrylic resin (solid content 50% by mass).

[0098] [Example 1] As the substrate (Y), EVA-1, which is the resin composition (x1), was applied to the side opposite the thermosensitive coloring layer of thermal paper (75 μm thick) using a Mayer bar so that the thickness of the first resin layer (X1) after drying would be 5 μm, forming a coating film (x1f). The coating film (x1f) was then dried at 70° C. to form a first resin layer (X1) made of EVA-1 on the surface of the substrate (Y) opposite to the thermosensitive coloring layer. Next, using a Mayer bar, PU-1, which is the resin composition (x2), was applied to the surface of the first resin layer (X1) opposite the substrate (Y) so that the thickness after drying was 7 μm, thereby forming a coating film (x2f). The coating film (x2f) was then dried at 70°C to form a second resin layer (X2) made of PU-1 on the surface of the first resin layer (X1) opposite to the substrate (Y). Next, a release liner (80 g / m2 The adhesive Acrylic-1 was applied to the glassine paper coated with silicone using an applicator so that the film thickness after drying would be 15 μm, forming a coating film (zf), which was then dried at 100°C to form an adhesive layer (Z). Furthermore, the second resin layer (X2) was attached to the exposed surface of the pressure-sensitive adhesive layer (Z) to obtain a pressure-sensitive adhesive label.

[0099] [Example 2] An adhesive label was obtained in the same manner as in Example 1, except that the thickness of the layer (X2) was changed to 5 μm.

[0100] [Example 3] An adhesive label was obtained in the same manner as in Example 1, except that the PU-1 used in Example 1 as the resin composition (x2) was changed to PU-2 and the thickness of the layer (X2) was changed to 6 μm.

[0101] [Comparative Example 1] An adhesive label was obtained in the same manner as in Example 1, except that the PU-1 used in Example 1 as the resin composition (x2) was changed to EVA-2 and the thickness of the layer (X2) was changed to 6 μm.

[0102] Comparative Example 2 An adhesive label was obtained in the same manner as in Example 1, except that PU-1 used in Example 1 as the resin composition (x2) was changed to Acrylic-2.

[0103] [Table 1]

[0104] From Table 1, it was confirmed that the pressure-sensitive adhesive labels of Examples 1 to 3 did not experience lifting of the cohesive failure layer (X). On the other hand, as can be seen from Table 1, in the adhesive labels of Comparative Examples 1 and 2, the second resin layer (X2) was not formed from a resin composition (x2) containing a urethane resin (U), and as a result, the layer (X) became lifted. Furthermore, it was confirmed that the adhesive labels of Examples 1 to 3 enable the substrate (Y) to be separated from the adhesive label without requiring an unnecessarily high force, and that stickiness can be prevented on the surface of the adhesive label opposite the adhesive layer (Z) after the substrate (Y) is separated. Furthermore, observation with a scanning electron microscope confirmed that cohesive failure occurred within the first resin layer (X1), destroying the layer (X) and separating the substrate (Y) from the layer (Z). 2 shows an image of the peeled surface of the substrate (Y) observed with a scanning electron microscope after the first resin layer (X1) underwent cohesive failure and the substrate (Y) was peeled from the adhesive label in Example 1. As a result of the observation, adhesive residue, which is the remaining resin of the first resin layer (X1), was confirmed over the entire peeled surface of the substrate (Y). This confirmed that cohesive failure occurred within the first resin layer (X1), rather than other forms of failure such as interfacial peeling. [Explanation of symbols]

[0105] 10 adhesive labels Y Base material (Y) X Cohesive failure layer (X) X1 1st resin layer (X1) X2 Second resin layer (X2) Z Adhesive layer (Z) 1 release liner

Claims

1. A laminate comprising a substrate (Y), a cohesive failure layer (X), a pressure-sensitive adhesive layer (Z), and a release liner laminated in this order, the layer (X) is a layer formed from a first resin layer (X1) formed from a resin composition (x1) containing an ethylene-vinyl acetate resin (A) and a fatty acid metal salt (B), and a second resin layer (X2) formed from a resin composition (x2) containing a polyether-based polyurethane or a polyester-based polyurethane as the urethane resin (U), and the layer (X1) and the layer (X2) are arranged in this order from the substrate (Y) side; In the resin composition (x1), the content of the fatty acid metal salt (B) is 400 parts by mass or less per 100 parts by mass of the ethylene-vinyl acetate resin (A), A pressure-sensitive adhesive label characterized in that cohesive failure occurs within the layer (X1), causing the layer (X) to break and separating the substrate (Y) and the layer (Z).

2. 2. The adhesive label according to claim 1, wherein the content of the fatty acid metal salt (B) in the resin composition (x1) is 70 parts by mass or more per 100 parts by mass of the ethylene-vinyl acetate resin (A).

3. The adhesive label according to claim 1 or 2, wherein the content of the fatty acid metal salt (B) in the resin composition (x2) is less than 70 parts by mass per 100 parts by mass of the urethane resin (U).

4. The adhesive label according to any one of claims 1 to 3, wherein a total content of the ethylene-vinyl acetate resin (A) and the fatty acid metal salt (B) is 50 mass% or more, based on 100 mass% of a total amount of solids in the resin composition (x1).

5. The adhesive label according to any one of claims 1 to 4, wherein the content of the urethane resin (U) is 50 mass% or more, relative to 100 mass% of the total solid content in the resin composition (x2).

6. The adhesive label according to any one of claims 1 to 5, wherein the fatty acid metal salt (B) is at least one selected from calcium stearate, magnesium stearate, zinc stearate, barium stearate, lithium stearate, and aluminum stearate.

7. The adhesive label according to any one of claims 1 to 6, wherein the layer (X) has a thickness of 40 µm or less.

8. The adhesive label according to any one of claims 1 to 7, which is a delivery slip label.

9. The method for producing an adhesive label according to any one of claims 1 to 8, comprising the following steps (S1) to (S4) in this order, and further comprising the following step (S5): Step (S1): A step of applying a resin composition (x1) containing an ethylene-vinyl acetate resin (A) and a fatty acid metal salt (B) onto one surface of a substrate (Y) to form a coating film (x1f). Step (S2): Step of drying the coating film (x1f) to form the first resin layer (X1) Step (S3): A step of applying a resin composition (x2) containing a urethane resin (U) to the surface of the first resin layer (X1) opposite to the substrate (Y) to form a coating film (x2f). Step (S4): Step of drying the coating film (x2f) to form the second resin layer (X2) Step (S5): Step of forming a pressure-sensitive adhesive layer (Z) and a release liner on the surface of the second resin layer (X2) opposite to the substrate (Y).

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