Label

Abstract

To provide a label which improves recyclability of an adherent after the label is adhered, and is capable of adjusting peeling of a dummy adhesive layer and an intermediate substrate.SOLUTION: A label comprises a surface substrate, an intermediate substrate and an adhesive layer. In the label, between the surface substrate and the intermediate substrate, a first thermally curable resin layer and a second thermally curable resin layer are disposed in this order. The second thermally curable resin layer and the intermediate substrate can be peeled, and the intermediate substrate is a paper substrate. An adhesive agent constituting the adhesive layer is a re-moistened adhesive agent containing at least one selected from a group consisting of a polyvinyl alcohol-based adhesive agent, a starch-based adhesive agent, a cellulose-based adhesive agent and a polyvinyl acetate-based adhesive agent.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a label. [Background technology]

[0002] When a package is delivered to a destination by a courier service or the like, a delivery slip label with the address and product information printed on it is affixed to a cardboard box or the like. After the delivery destination affixes a seal of receipt, the delivery company peels off a part of the affixed delivery slip as a receipt and takes it home. For example, half-cut lines are made in the surface base material of the delivery slip label, so that the surface base material can be separated into multiple pieces and peeled off, and one piece of the surface base material separated by the half-cut line is used as the delivery slip, while the other piece of the surface base material is peeled off as the receipt.

[0003] In this way, a pseudo-adhesive layer has been used in delivery slips so that receipts and the like can be peeled off. For example, Patent Document 1 discloses a pseudo-adhesive sheet in which the back surface of a surface substrate is resin-treated, and a thermoplastic resin is provided on the resin-treated surface by an extrusion lamination method, thereby enabling the pseudo-adhesive layer to be peeled off from the surface substrate.

[0004] In addition, Patent Document 2 discloses a pseudo-adhesive label in which a slip substrate, a pseudo-adhesive layer, an intermediate substrate, an adhesive layer, and a release sheet are laminated in this order so that the pseudo-adhesive layer and the intermediate substrate have pseudo-adhesion. This pseudo-adhesive label is used by peeling off the release sheet and attaching it to an object to be adhered by the adhesive layer, and in the label attached to the object to be adhered, the slip substrate and the pseudo-adhesive layer can be easily peeled off from the intermediate substrate by hand. In Patent Document 2, a thermoplastic resin that becomes a pseudo-adhesive layer is melted and applied to the back side of the slip substrate, and then the intermediate substrate, the adhesive layer, and the release sheet are laminated together, and the laminate is cooled and pressed with a cooling roll, so that peeling occurs between the pseudo-adhesive layer, which is a thermoplastic resin, and the intermediate substrate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-202771 [Patent Document 2] Utility Model Registration No. 3178208 Summary of the Invention [Problem to be solved by the invention]

[0006] Cardboard boxes to which delivery slip labels are affixed are collected as resource waste and recycled. At this time, the delivery slip label remains on the cardboard from which the receipt and other items have been peeled off, but if polyolefin resins, known as a thermoplastic resin layer, and adhesives for adhering to the cardboard remain on the cardboard, the thermoplastic resin layer and adhesives must be peeled off when the cardboard is recycled, making it difficult to recycle.

[0007] Furthermore, in Patent Document 2, it is necessary to adjust the pseudo-adhesive strength by adjusting heat and pressure, and there are cases in which the adhesive strength varies when the conditions change.

[0008] Therefore, an object of the present invention is to provide a label that is highly recyclable and in which the peeling between the pseudo-adhesive layer and the intermediate substrate is easily controlled. [Means for solving the problem]

[0009] The present invention provides the following:

[0010] (1) A label having a surface substrate, an intermediate substrate, and an adhesive layer, wherein a first thermoplastic resin layer and a second thermoplastic resin layer are disposed in this order between the surface substrate and the intermediate substrate, and the second thermoplastic resin layer is peelable from the intermediate substrate, the intermediate substrate is a paper substrate, and the adhesive constituting the adhesive layer is a remoistenable adhesive containing at least one adhesive selected from the group consisting of a polyvinyl alcohol-based adhesive, a starch-based adhesive, a cellulose-based adhesive, and a vinyl acetate-based adhesive.

[0011] (2) The label described in (1), wherein the first thermoplastic resin layer contains a polyolefin resin.

[0012] (3) The label described in (2), wherein the first thermoplastic resin layer is formed from a resin composition containing a functional group-containing polyolefin resin.

[0013] (4) The label according to (3), wherein the functional group is an epoxy group and / or a carboxy group.

[0014] (5) The label described in any one of (1) to (4), wherein the second thermoplastic resin layer contains a polyolefin resin.

[0015] (6) The label described in (5), wherein the polyolefin resin contained in the second thermoplastic resin layer is a polyethylene resin.

[0016] (7) The label according to any one of (1) to (6), wherein the surface substrate is a paper substrate.

[0017] (8) The label according to (7), wherein the paper base material is thermal paper.

[0018] (9) A label described in any of (1) to (8) which is a shipping slip label.

[0019] (10) The label according to any one of (1) to (9), wherein the intermediate substrate is glassine paper. Effect of the Invention

[0020] According to the present invention, the recyclability of the adherend after the label is affixed is improved, and the peeling between the pseudo-adhesive layer and the intermediate substrate can be adjusted. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a cross-sectional view of a label according to one embodiment of the present invention. [Diagram 2]FIG. 2(A) is a cross-sectional view showing a label of another embodiment, and FIG. 2(B) is a top view. [Diagram 3] FIG. 3 is a cross-sectional view showing a label according to another embodiment. [Figure 4] FIG. 4 is a diagram for explaining an example of a method of using the label of the embodiment of FIG. [Diagram 5] FIG. 5 shows an example of a label manufacturing process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The present invention is a label having a surface substrate, an intermediate substrate, and an adhesive layer, wherein a first thermoplastic resin layer and a second thermoplastic resin layer are disposed in this order between the surface substrate and the intermediate substrate, and the second thermoplastic resin layer is peelable from the intermediate substrate, the intermediate substrate is a paper substrate, and the adhesive constituting the adhesive layer is a remoistenable adhesive containing at least one adhesive selected from the group consisting of a polyvinyl alcohol-based adhesive, a starch-based adhesive, a cellulose-based adhesive, and a polyvinyl acetate-based adhesive.

[0023] In the present invention, two thermoplastic resin layers are laminated. Therefore, it is easier to adjust the peeling between the thermoplastic resin layer, which is the pseudo-adhesive layer, and the intermediate substrate, compared to when there is one thermoplastic resin layer. This is because the upper layer of the second thermoplastic resin layer, which is the pseudo-adhesive layer, is the first thermoplastic resin layer, which has high affinity, so that the second thermoplastic resin layer has higher adhesion to the upper first thermoplastic resin layer than to the intermediate substrate, which is the paper substrate below. Therefore, peeling between the second thermoplastic resin layer and the intermediate substrate is easily performed.

[0024] In the present invention, peeling occurs between the second thermoplastic resin layer and the intermediate substrate. Therefore, after peeling, the intermediate substrate, which is a paper substrate, and the adhesive layer containing polyvinyl alcohol remain on the adherend. Therefore, even if the adherend is a paper material such as cardboard, there is no need to separate the intermediate substrate and the adhesive layer, and the intermediate substrate and the adhesive layer can be recycled together with the adherend, improving the work efficiency during the recycling process (high recyclability).

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated explanations will be omitted. In addition, the dimensional ratios of the drawings are exaggerated for the convenience of explanation, and may differ from the actual ratios.

[0026] FIG. 1 is a cross-sectional view of a label according to one embodiment of the present invention. The drawings are exaggerated for the sake of convenience, and the dimensional ratios of the components in the drawings may differ from the actual ratios. In FIG. 1, the label 10 is composed of a surface substrate 11, a first thermoplastic resin layer 12, a second thermoplastic resin layer 13, an intermediate substrate 14, and an adhesive layer 15. The surface substrate 11 can be printed with information such as a delivery destination. The first thermoplastic resin layer 12 is arranged to bond the surface substrate and the second thermoplastic resin 13. The label 10 can be peeled off between the second thermoplastic resin layer 13 and the intermediate substrate 14.

[0027] The adhesive constituting the adhesive layer 15 is a remoisturizable adhesive. The remoisturizable adhesive exhibits tackiness when water is applied, and does not have tackiness when water is not applied. As a result, while a constantly tacky adhesive layer requires a release liner before use, the remoisturizable adhesive layer does not require a release liner, and therefore has a smaller environmental impact. Therefore, the label of one embodiment of the present invention does not include a release liner.

[0028] In the case of a paper substrate to which a delivery label is affixed, such as cardboard, if a resin material remains during recycling, the resin material must be peeled off. In the present invention, since the second thermoplastic resin layer and the intermediate substrate are peelable, the thermoplastic resin layer that must be removed during recycling of cardboard and the like can be easily removed, and since the intermediate substrate is a paper substrate and the remoistening adhesive contains at least one selected from the group consisting of polyvinyl alcohol, starch, cellulose, and polyvinyl acetate, which are also used for paper, it is possible to recycle the cardboard together with the second thermoplastic resin layer without removing these materials.

[0029] As long as the surface substrate and the first thermoplastic resin layer, and the second thermoplastic resin layer and the intermediate substrate are adjacent to each other, the label may have other functional layers disposed on the surface or between each layer.

[0030] FIG. 2(A) is a cross-sectional view showing a label 30 of another embodiment, and FIG. 2(B) is a top view. The label 30 is provided with a half-cut line 20. The half-cut line 20 is formed by cutting the surface substrate 11, the first thermoplastic resin layer 12, and the second thermoplastic resin layer 13 in the stacking direction from the surface side so as not to cut (penetrate) the intermediate substrate 14. The half-cut line 20 may be formed in a perforated shape or a slit shape. The half-cut line 20 separates the label 30 into an area 21 and an area 22 that can be peeled off from the intermediate substrate. The area 21 is, for example, a delivery slip, and the area 22 is, for example, a receipt.

[0031] Fig. 3 is a cross-sectional view showing a label 40 of another embodiment. The label 40 in Fig. 3 differs from the label 30 in Fig. 2 in that there are two half-cut lines 20 in the stacking direction. The area 22 that can be peeled off from the intermediate substrate by the half-cut lines is, for example, a receipt.

[0032] FIG. 4 is a diagram for explaining an example of a method of using the label 40 of the embodiment of FIG. 3. The label 40 is attached to the flap 16 of the adherend, which is the cardboard (FIG. 4(A)). When the delivery is completed, the delivery person peels off the region 22 and takes it home (FIG. 4(B)). When the region 22 is peeled off, the other region 23 still remains on the adherend, which is the cardboard (FIG. 4(C)). Even in such a case, the other region 23 can be easily peeled off because the second thermoplastic resin layer 13 and the intermediate substrate 14 can be peeled off. By peeling off the other region 23, the intermediate substrate 14, which is a paper substrate that can be recycled together with the cardboard, and the adhesive layer 15 containing at least one adhesive selected from the group consisting of a polyvinyl alcohol adhesive, a starch adhesive, a cellulose adhesive, and a polyvinyl acetate adhesive, remain on the cardboard (FIG. 4(D)). These materials are materials that can be recycled together with the cardboard, so that recyclability is improved.

[0033] Each component constituting each label will be described below. In this specification, "X to Y" indicating a range means "X or more and Y or less". Furthermore, unless otherwise specified, operations and measurements of physical properties are performed under the conditions of room temperature (20 to 25°C) and relative humidity 45 to 55% RH. Furthermore, in this specification, "(meth)acrylic acid" refers to "acrylic acid or methacrylic acid". In the following description, the label of the present invention may be simply referred to as "label". The concept of "label" includes those called films, sheets, tapes, etc.

[0034] (Surface base material) The surface substrate is not particularly limited, and may be either a resin substrate or a paper substrate, but is preferably a paper substrate since it can be used for slips, etc. The paper substrate is not particularly limited, and examples thereof include fine paper, craft paper, glassine paper, coated paper, art paper, cast-coated paper, impregnated paper, foam paper, synthetic paper, thermal paper, dust-free paper, parchment paper, rayon paper, and recycled paper. The paper substrate may also be a laminate of two or more layers of these. Among these, the paper substrate is preferably thermal paper, craft paper, fine paper, art paper, coated paper, or cast-coated paper, and more preferably thermal paper.

[0035] Various information may be recorded on the surface of the surface substrate (the side facing the thermoplastic resin layer). When the surface substrate is thermal paper, it has a thermal coloring layer (not shown) on the surface (the side facing the thermoplastic resin layer). This allows recording on the surface of the thermal paper using a thermal printer or the like. Examples of the thermal coloring layer include those containing a leuco dye and a color developer that reacts with the leuco dye. The thermal coloring layer is suitably 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 of the paper substrate.

[0036] The surface substrate may have a coating layer for printing on the surface.

[0037] The thickness of the surface substrate is not particularly limited, but is preferably 10 μm to 200 μm, more preferably 20 μm to 150 μm, and even more preferably 30 μm to 100 μm. By setting the thickness to such a range, the handling property during application and after peeling is improved.

[0038] The surface substrate is, for example, a substrate for displaying information on the adherend. For example, when the adherend is a delivery item and the label is used as a delivery slip label, the information on the adherend may include the sender, destination, and the name or name of the delivery company, address, telephone number, and contents of the delivery item.

[0039] The information may be displayed using, for example, characters, symbols, figures, or any combination thereof, and may also be displayed using two-dimensional codes such as bar codes and QR codes (registered trademark).

[0040] (First thermoplastic resin layer) The material of the first thermoplastic resin layer 12 is not particularly limited as long as it can bond the surface substrate 11 and the second thermoplastic resin layer 13 to each other.

[0041] The first thermoplastic resin layer 12 preferably contains a thermoplastic resin, and is preferably formed substantially only from a thermoplastic resin. The first thermoplastic resin layer 12 being substantially composed only of a thermoplastic resin means that 80% by mass or more (upper limit 100% by mass) of the total mass of the first thermoplastic resin layer 12 is composed of a thermoplastic resin. The first thermoplastic resin layer 12 preferably contains 85% by mass or more of a thermoplastic resin, more preferably 90% by mass or more, and even more preferably 95% by mass or more of the thermoplastic resin, based on the total mass of the first thermoplastic resin layer 12.

[0042] Examples of the thermoplastic resin contained in the first thermoplastic resin layer include ethylene-acrylic copolymer resin, styrene resin, acrylic resin, polyester resin, vinyl acetate resin, polyurethane resin, acrylic acid ester copolymer resin, polyolefin resin such as polyethylene, ethylene-vinyl acetate copolymer resin, polypropylene, styrene-butadiene copolymer resin, natural rubber resin, vinylidene chloride resin, etc. The first thermoplastic resin layer may contain one type of thermoplastic resin or two or more types of thermoplastic resin.

[0043] The first thermoplastic resin layer preferably contains a polyolefin-based resin. The polyolefin-based resin is a polymer having at least a structural unit derived from an olefin monomer. The olefin monomer is preferably an olefin having 2 to 8 carbon atoms. Examples of the olefin having 2 to 8 carbon atoms include ethylene, propylene, butylene, isobutylene, and 1-hexene. In one aspect of the present embodiment, the olefin monomer is more preferably at least one monomer selected from the group consisting of ethylene, propylene, and butylene, which are olefins having 2 to 4 carbon atoms, and further preferably at least one monomer selected from the group consisting of ethylene and propylene, which are olefins having 2 to 3 carbon atoms. The polyolefin-based resin may be a polymer using one type of olefin monomer alone, or may be a copolymer using two or more types of olefin monomers in combination.

[0044] Examples of polyolefin resins include polyethylene resins, polypropylene resins (PP), polybutene resins (PB), ethylene-propylene copolymers, olefin elastomers (TPO), the functional group-containing polyolefin resins described below, and olefin terpolymers such as ethylene-propylene-(5-ethylidene-2-norbornene).

[0045] From the viewpoint of ensuring adhesive strength between the first thermoplastic resin layer 12 and the second thermoplastic resin layer 13, the thermoplastic resin constituting the first thermoplastic resin layer 12 is preferably a resin of the same type as the thermoplastic resin constituting the second thermoplastic resin layer 13. For example, when a polyolefin-based resin is used for the second thermoplastic resin layer 13, it is preferable to use a polyolefin-based resin for the first thermoplastic resin layer 12 as well, and when a polyethylene-based resin is used for the second thermoplastic resin layer 13, it is preferable to use a polyethylene-based resin for the first thermoplastic resin layer 12 as well.

[0046] The polyolefin resin used as the thermoplastic resin for forming the first thermoplastic resin layer is preferably a functional group-containing polyolefin resin because it has a high adhesive strength with the surface substrate, particularly with the paper substrate. It is believed that the functional group in the thermoplastic resin reacts with the functional group of the paper substrate, improving the adhesive strength between the first thermoplastic resin layer and the paper substrate, and making it easier to peel the second thermoplastic resin layer from the intermediate substrate.

[0047] Examples of functional groups contained in the functional group-containing polyolefin resin include epoxy groups, carboxy groups, groups derived from carboxylic anhydrides, carboxylate groups, hydroxyl groups, amide groups, ammonium groups, nitrile groups, amino groups, imide groups, isocyanate groups, acetyl groups, thiol groups, sulfonyl groups, phosphoryl groups, nitro groups, halogen atoms, etc. Among these functional groups, epoxy groups, carboxy groups, groups derived from carboxylic anhydrides, carboxylate groups, hydroxyl groups, ammonium groups, amino groups, imide groups, or isocyanate groups are preferred, and at least one selected from the group consisting of epoxy groups, carboxy groups, groups derived from carboxylic anhydrides, and carboxylate groups is more preferred, and epoxy groups or carboxy groups are even more preferred.

[0048] Examples of functional group-containing polyolefin resins include copolymers of olefins and functional group-containing monomers; and modified polyolefins.

[0049] The copolymer of an olefin and a functional group-containing monomer may be any of a random copolymer, a block copolymer, and a graft copolymer.

[0050] Examples of the olefin include one or more selected from the group consisting of ethylene and α-olefins having 3 to 20 carbon atoms. Among these, preferably one or more selected from ethylene and α-olefins having 3 to 8 carbon atoms, more preferably one or more selected from ethylene and propylene, and even more preferably ethylene.

[0051] The functional group-containing monomer is preferably a compound having the various functional groups described above, and may have two or more types of polar sites in the molecule.

[0052] The compound having a functional group may be a functional group-containing monomer. The functional group-containing monomer is preferably one or more selected from the group consisting of unsaturated carboxylic acid, unsaturated compound having a carboxylic acid anhydride group (e.g., anhydride of unsaturated dicarboxylic acid), unsaturated carboxylic acid ester (e.g., ester of unsaturated carboxylic acid and aliphatic alcohol), and vinyl fatty acid, more preferably one or more selected from the group consisting of methacrylic acid, acrylic acid, methyl methacrylate, methyl acrylate, maleic acid, maleic anhydride, and vinyl acetate.

[0053] In the copolymer of an olefin and a functional group-containing monomer, the content of units derived from the functional group-containing monomer is preferably 0.1 to 30 mass%, more preferably 0.2 to 10 mass%, relative to 100 mass% in total of the structural units derived from the olefin and the structural units derived from the functional group-containing monomer.

[0054] In addition, functional group-containing polyolefin resins can also be prepared by introducing functional groups into polyolefin resins using compounds having various functional groups. Examples of such compounds having functional groups include the following epoxy group-containing compounds. Specifically, when a mixture of a polyolefin resin and an epoxy group-containing compound is thermoformed, an epoxy group-containing polyolefin resin can be obtained. Examples of epoxy group-containing compounds include (meth)acrylic acid glycidyl ester, phthalic acid diglycidyl ester, isophthalic acid diglycidyl ester, terephthalic acid diglycidyl ester, adipic acid diglycidyl ester, trimethylolpropane triglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, butanediol diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, phenol novolac polyglycidyl ether, and epoxidized vegetable oil.

[0055] Among the epoxy group-containing compounds, polyfunctional epoxy compounds containing at least two epoxy groups (oxirane groups) in the molecule are preferred. The epoxy compounds containing two or more epoxy groups in the molecule have improved adhesive strength compared to epoxy compounds containing one epoxy group in the molecule. The molecular weight of the epoxy compounds is preferably 3000 or less.

[0056] Among the epoxy group-containing compounds, epoxidized vegetable oils are suitable. Epoxidized vegetable oils are those in which the unsaturated double bonds of natural vegetable oils are epoxidized with peroxy acid or the like, and examples thereof include epoxidized soybean oil, epoxidized linseed oil, epoxidized olive oil, epoxidized safflower oil, and epoxidized corn oil. These epoxidized vegetable oils are commercially available, for example, as O-130P (epoxidized soybean oil) and O-180A (epoxidized linseed oil) manufactured by Asahi Denka Kogyo Co., Ltd.

[0057] The amount of the epoxy group-containing compound added is preferably 0.01 to 5 parts by mass, and more preferably 0.01 to 1 part by mass, per 100 parts by mass of the polyolefin resin.

[0058] Preferable copolymers of olefins and functional group-containing monomers include one or more selected from the group consisting of ethylene-(meth)acrylic acid copolymers and ethylene-(meth)acrylic acid ester copolymers.

[0059] The modified polyolefin is preferably an acid-modified polyolefin.

[0060] Examples of acid-modified polyolefins include polyolefins modified (graft-modified) by graft-reacting a modifier, which is an unsaturated carboxylic acid and / or a derivative thereof, with a polyolefin in the presence of a radical initiator such as an organic peroxide, thereby introducing a group derived from the unsaturated carboxylic acid and / or a derivative thereof into the polyolefin.

[0061] The graft reaction is carried out, for example, by a method in which a modifier is blended with a polyolefin, and the polyolefin is extruded in a molten state using an extrusion molding machine or the like to modify the polyolefin under high temperature and high shear (melt kneading method), or by a method in which a polyolefin is dissolved in a solvent, and a modifier is blended with this solution to modify the polyolefin (solution method).

[0062] Examples of polyolefins to be modified with a modifying agent include polymers obtained by polymerizing one or more monomers selected from the group consisting of ethylene, the above-mentioned α-olefins having 3 to 20 carbon atoms, and the above-mentioned cyclic olefins.

[0063] Among these, one or more types selected from polymers having ethylene as the main monomer (including ethylene homopolymers), polymers having propylene as the main monomer (including propylene homopolymers), polymers having 1-butene as the main monomer (including 1-butene homopolymers), and polymers having 4-methyl-1-pentene as the main monomer (including 4-methyl-1-pentene homopolymers) are preferred, one or more types selected from polymers having ethylene as the main monomer and polymers having propylene as the main monomer are more preferred, and one or more types selected from polymers having propylene as the main monomer are even more preferred.

[0064] When other monomers are copolymerized together with the main component monomer, the other monomers are preferably at least one selected from ethylene and α-olefins having 3 to 10 carbon atoms.

[0065] Examples of the unsaturated carboxylic acid and / or its derivative used as a modifier include unsaturated compounds having a carboxylic acid group (unsaturated carboxylic acid), unsaturated compounds having a carboxylic acid anhydride group (e.g., anhydrides of unsaturated dicarboxylic acids), and derivatives of unsaturated carboxylic acids such as unsaturated carboxylic acid esters (e.g., esters of unsaturated carboxylic acids and aliphatic alcohols). Examples of the unsaturated groups contained in these unsaturated compounds include vinyl groups, vinylene groups, and unsaturated cyclic hydrocarbons.

[0066] Examples of unsaturated carboxylic acids include unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid; unsaturated dicarboxylic acids such as maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, glutaconic acid, norbornene dicarboxylic acid, nadic acid, and endo-cis-bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid; and unsaturated tricarboxylic acids such as aconitic acid.

[0067] Examples of the unsaturated carboxylic acid anhydride include anhydrides of the above-mentioned unsaturated polyvalent carboxylic acids such as maleic anhydride, citraconic anhydride, and nadic anhydride.

[0068] The derivatives of unsaturated carboxylic acids may be in the form of esters such as unsaturated carboxylic acid esters, acid halides, imides, esters, etc., and examples thereof include malenyl chloride, malenylimide, monomethyl maleate, and dimethyl maleate.

[0069] These unsaturated carboxylic acids and / or derivatives thereof can be used alone or in combination of two or more. Among these, one or more selected from maleic acid, nadic acid, maleic anhydride, and nadic anhydride are preferred, one or more selected from maleic acid and maleic anhydride are more preferred, and maleic anhydride is even more preferred.

[0070] The graft amount of the unsaturated carboxylic acid and / or its derivative grafted into the acid-modified polyolefin is preferably 0.1 mass% or more, more preferably 0.2 mass% or more, and preferably 20 mass% or less, 15 mass% or less, or 10 mass% or less, more preferably 5 mass% or less.

[0071] The functional group-containing polyolefin resin may be a commercially available product.

[0072] The first thermoplastic resin layer may contain an additive. Examples of the additive include an antioxidant, a lubricant, an ultraviolet absorber, a colorant, and an antiblocking agent. When the first thermoplastic resin layer contains an additive, the additive may be one type or two or more types. When the first thermoplastic resin layer contains an additive, the content of the additive is preferably 0.0001 parts by mass or more and 20 parts by mass or less, more preferably 0.0005 parts by mass or more and 15 parts by mass or less, and even more preferably 0.001 parts by mass or more and 10 parts by mass or less, relative to 100 parts by mass of the thermoplastic resin.

[0073] The thickness of the first thermoplastic resin layer is not particularly limited, but is, for example, 5 μm to 50 μm, 5 μm to 40 μm, 10 μm to 40 μm, or 10 μm to 30 μm.

[0074] (Second thermoplastic resin layer) The second thermoplastic resin layer serves as a pseudo-adhesive layer. The second thermoplastic resin layer is preferably formed substantially only from a thermoplastic resin. The pseudo-adhesive layer being substantially composed of a thermoplastic resin means that 80% by mass or more (up to 100% by mass) of the total mass of the second thermoplastic resin layer is composed of a thermoplastic resin. The second thermoplastic resin layer preferably contains 85% by mass or more of a thermoplastic resin, more preferably 90% by mass or more, and even more preferably 95% by mass or more of the thermoplastic resin, based on the total mass of the second thermoplastic resin layer.

[0075] Examples of the thermoplastic resin contained in the second thermoplastic resin layer include ethylene-acrylic copolymer resin, styrene resin, acrylic resin, polyester resin, vinyl acetate resin, polyurethane resin, acrylic acid ester copolymer resin, polyolefin resin such as polyethylene, ethylene-vinyl acetate copolymer resin, polypropylene, styrene-butadiene copolymer resin, natural rubber resin, vinylidene chloride resin, etc. The second thermoplastic resin layer may contain one type of thermoplastic resin or two or more types of thermoplastic resin.

[0076] The thermoplastic resin contained in the second thermoplastic resin layer is preferably a polyolefin resin. The polyolefin resin is a polymer having at least a structural unit derived from an olefin monomer. The olefin monomer is preferably an olefin having 2 to 8 carbon atoms. Examples of the olefin having 2 to 8 carbon atoms include ethylene, propylene, butylene, isobutylene, and 1-hexene. In one aspect of the present embodiment, the olefin monomer is more preferably at least one monomer selected from the group consisting of ethylene, propylene, and butylene, which are olefins having 2 to 4 carbon atoms, and more preferably at least one monomer selected from the group consisting of ethylene and propylene, which are olefins having 2 to 3 carbon atoms. The polyolefin resin may be a polymer using one type of olefin monomer alone, or may be a copolymer using two or more types of olefin monomers in combination. The second thermoplastic resin layer may contain one type of polyolefin resin as a thermoplastic resin, or may contain two or more types.

[0077] Examples of polyolefin resins include polyethylene resin, polypropylene resin (PP), polybutene resin (PB), ethylene-propylene copolymer, olefin elastomer (TPO), ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), olefin ternary copolymer such as ethylene-propylene-(5-ethylidene-2-norbornene), etc. When the intermediate substrate is a paper substrate, the polyolefin resin is preferably at least one resin selected from the group consisting of polyethylene resin, polypropylene resin (PP) and polybutene resin (PB), more preferably at least one resin selected from the group consisting of polyethylene resin and polypropylene resin (PP), and even more preferably polyethylene resin, from the viewpoint of realizing good pseudo-adhesion with the paper substrate and from the viewpoint of easy thermocompression bonding to the paper substrate.

[0078] Therefore, in one preferred embodiment of the present invention, the first thermoplastic resin layer contains a functional group-containing polyolefin resin, and the second thermoplastic resin layer contains an (unmodified) polyethylene resin.

[0079] Examples of polyethylene resins include very low density polyethylene (VLDPE, density: 880 kg / m 3 More than 910kg / m 3 (less than 910 kg / m), low density polyethylene (LDPE, density: 910 kg / m 3 More than 942kg / m 3 less than 942 kg / m 3 or higher), and linear polyethylene.

[0080] The second thermoplastic resin layer may contain an additive. Examples of the additive include an antioxidant, a lubricant, an ultraviolet absorber, a colorant, and an antiblocking agent. When the second thermoplastic resin layer contains an additive, the additive may be one type or two or more types. When the second thermoplastic resin layer contains an additive, the content of the additive is preferably 0.0001 parts by mass or more and 20 parts by mass or less, more preferably 0.0005 parts by mass or more and 15 parts by mass or less, and even more preferably 0.001 parts by mass or more and 10 parts by mass or less, relative to 100 parts by mass of the thermoplastic resin.

[0081] The thickness of the second thermoplastic resin layer is not particularly limited, but is, for example, 1 μm to 50 μm, 5 μm to 40 μm, 10 μm to 40 μm, or 10 μm to 30 μm.

[0082] The thickness of the second thermoplastic resin layer may be the same as the thickness of the first thermoplastic resin layer, may be thicker than the thickness of the first thermoplastic resin layer, or may be thinner than the thickness of the first thermoplastic resin layer.

[0083] The second thermoplastic resin layer is peelable from the intermediate substrate and is pseudo-adhered to the intermediate substrate. The pseudo-adhesion strength of the second thermoplastic resin layer 13 to the intermediate substrate 14 is preferably 150 mN / 50 mm or more and 2000 mN / 50 mm or less, more preferably 200 mN / 50 mm or more and 1000 mN / 50 mm or less, and even more preferably 250 mN / 50 mm or more and 600 mN / 50 mm or less. When the pseudo-adhesion strength of the second thermoplastic resin layer is equal to or more than the lower limit, peeling at the pseudo-adhesion interface between the second thermoplastic resin layer and the intermediate substrate and lifting of the label can be suppressed. When the pseudo-adhesion strength of the second thermoplastic resin layer is equal to or less than the upper limit, the label can be easily peeled from the intermediate substrate. The pseudo-adhesion strength can be measured by the method described below.

[0084] Pseudo adhesion measurement method: A test piece with a width of 50 mm is prepared, peeled at the interface between the second thermoplastic resin layer and the intermediate substrate, and the laminate above the second thermoplastic resin layer is gripped and the laminate of the intermediate substrate and the adhesive layer is fixed. The gripped and fixed test piece is peeled at the pseudo-adhesive interface under the following conditions: peel speed: 300 mm / min, peel angle: 180°. The magnitude of the force (peel force) required for this peeling is measured, and the measured peel force is regarded as the pseudo-adhesive force. The unit of pseudo-adhesive force is mN / 50 mm.

[0085] (Intermediate substrate) The intermediate substrate is preferably a paper substrate. By using a paper substrate as the intermediate substrate, even if the label remains on the adherend, for example, on a cardboard, the label can be recycled as is, improving recyclability.

[0086] The paper substrate used as the intermediate substrate is not particularly limited, and examples thereof include glassine paper, craft paper, fine paper, coated paper, art paper, cast-coated paper, recycled paper, etc. The paper substrate may also be a laminate of two or more layers of these. Among these, the paper substrate used as the intermediate substrate is preferably glassine paper, craft paper, fine paper, coated paper, art paper, or cast-coated paper, and more preferably glassine paper in that the blade does not penetrate the paper when half-cutting.

[0087] The thickness of the intermediate substrate is not particularly limited, but is preferably 10 μm or more and 200 μm or less, more preferably 20 μm or more and 150 μm or less, and even more preferably 30 μm or more and 100 μm or less.

[0088] (adhesive layer) The adhesive constituting the adhesive layer is a remoistenable adhesive containing at least one adhesive selected from the group consisting of polyvinyl alcohol-based adhesives, starch-based adhesives, cellulose-based adhesives, and polyvinyl acetate-based adhesives.

[0089] Examples of polyvinyl alcohol used in the polyvinyl adhesive include unmodified polyvinyl alcohol and modified polyvinyl alcohol.

[0090] Examples of modified polyvinyl alcohol include α-olefin modified polyvinyl alcohol, cation modified polyvinyl alcohol, anion modified polyvinyl alcohol, silanol modified polyvinyl alcohol, acetoacetyl modified polyvinyl alcohol, and mercapto modified polyvinyl alcohol.

[0091] The adhesive strength of the remoistened adhesive layer depends, for example, on the degree of polymerization of the polyvinyl alcohol constituting the adhesive layer, and it is preferable that the degree of polymerization of the polyvinyl alcohol is 300 or more and 5000 or less, more preferably 350 or more and 4900 or less, and even more preferably 400 or more and 4800 or less.

[0092] This makes it possible to make the solubility of polyvinyl alcohol in water more suitable, allowing the adhesive layer to be formed more suitably and making the adhesive strength when water is applied more excellent.

[0093] In this specification, the "degree of polymerization of polyvinyl alcohol" refers to a value measured by a method based on the "average degree of polymerization" described in JIS K 6726:1994.

[0094] Even if the degree of polymerization of polyvinyl alcohol is within the above range, the adhesiveness of the adhesive layer can be adjusted by adjusting the degree of polymerization.

[0095] For example, when the degree of polymerization of polyvinyl alcohol is a value in a relatively low region within the above range, the polyvinyl alcohol becomes easily soluble in water, and the initial adhesive strength of the adhesive layer, in other words, the adhesive strength when the adhesive layer is wet after it is applied to the adherend to develop tackiness, can be improved.

[0096] Furthermore, when the degree of polymerization of polyvinyl alcohol is a value in a relatively high region within the above range, the adhesive strength of the adhesive layer after drying, in other words, the adhesive strength when water is applied to the adhesive layer to cause it to develop tackiness, and the adhesive layer is attached to an adherend and then dried to form a film, is high.

[0097] This can result in better final adhesive strength.

[0098] The degree of polymerization of polyvinyl alcohol can be determined according to the adhesive property that is important in the adhesive layer, for example, the initial adhesive strength after application to an adherend or the adhesive strength after drying.

[0099] In addition, in consideration of the balance between the two, it is also a preferred embodiment to combine polyvinyl alcohols having a high polymerization degree with those having a low polymerization degree. Specifically, polyvinyl alcohol A having a polymerization degree of 300 to 800 may be combined with polyvinyl alcohol B having a polymerization degree of 2000 to 5000. The polymerization degree of polyvinyl alcohol A is more preferably 350 to 700, and even more preferably 400 to 600. The polymerization degree of polyvinyl alcohol B is more preferably 2300 to 4900, and even more preferably 4200 to 4800. The blending ratio of polyvinyl alcohol A to polyvinyl alcohol B is preferably 30:70 to 70:30, more preferably 35:65 to 65:35, and even more preferably 40:60 to 60:40, by mass ratio.

[0100] The degree of saponification of the polyvinyl alcohol is preferably 70 mol% or more and 90 mol% or less, more preferably 75 mol% or more and 90 mol% or less, and even more preferably 80 mol% or more and 90 mol% or less, which allows the adhesive layer to have better tackiness when water is applied thereto.

[0101] In this specification, the "saponification degree of polyvinyl alcohol" refers to a value measured by a method based on the "saponification degree" described in JIS K 6726:1994.

[0102] Examples of starches used in starch-based adhesives include corn starch, wheat flour, sweet potato starch, potato starch, tapioca, etc. Starch also includes modified starch.

[0103] Polyvinyl acetate adhesives are made of polymers containing vinyl acetate as a monomer unit, and examples of constituent materials include polyvinyl acetate and ethylene-vinyl acetate copolymers.

[0104] Examples of materials constituting the cellulose-based adhesive include methyl cellulose, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, carboxymethyl cellulose, and biscellulose.

[0105] The adhesive layer may contain other components, such as a filler, a softener, a heat and light stabilizer, an antioxidant, and a crosslinking agent.

[0106] The thickness of the adhesive layer is not particularly limited, but is preferably from 1 μm to 50 μm, more preferably from 1 μm to 30 μm, and even more preferably from 1 μm to 20 μm.

[0107] The label according to the present invention is attached to an adherend by the adhesive layer after the adhesive layer is made tacky by applying water to the adhesive layer. The water applied to the adhesive layer is not particularly limited, but may be, for example, tap water, ion-exchanged water, or a liquid containing water.

[0108] The method for applying water to the adhesive layer is not particularly limited, but examples thereof include methods using a spray bottle, a brush, a sponge, a sponge roller, and the like.

[0109] (Label manufacturing method) The label manufacturing method is not particularly limited, but one embodiment of the label manufacturing method includes the steps of laminating a surface substrate and a first thermoplastic resin layer to obtain a laminate of the surface substrate and the first thermoplastic resin layer, laminating a second thermoplastic resin layer and an intermediate substrate on the obtained laminate to obtain a laminate of the surface substrate, the first thermoplastic resin layer, the second thermoplastic resin layer and the intermediate substrate, and providing an adhesive layer on the intermediate substrate side of the obtained laminate.

[0110] (1) A step of laminating a surface substrate and a first thermoplastic resin layer to obtain a laminate of the surface substrate and the first thermoplastic resin layer. The thermoplastic resin (or thermoplastic composition, hereinafter simply referred to as thermoplastic resin) constituting the first thermoplastic resin layer is melt-extruded onto the surface substrate. For example, a method using a T-die can be used as the melt-extrusion method. The melt-extrusion temperature is preferably 180°C or more and 400°C or less, more preferably 200°C or more and 350°C or less, and even more preferably 230°C or more and 300°C or less. From the viewpoint of improving the adhesion between the surface substrate and the first thermoplastic resin layer, the surface of the surface substrate on which the first thermoplastic resin layer is to be laminated may be subjected to a surface modification treatment, and then the first thermoplastic resin layer may be laminated. Examples of the surface modification treatment include ozone treatment, corona treatment, and anchor coat treatment. By forming the first thermoplastic resin layer on the surface substrate in advance in this way, the adhesive strength of the first thermoplastic resin layer to the surface substrate is improved.

[0111] The melt-extruded thermoplastic resin is preferably cooled. For example, the cooling can be performed by contacting the heated and melted thermoplastic resin with a cooling means such as a cooling roll. For example, a cooling roll having a cylindrical body with a metal outer circumferential surface can be used. The cooling roll may have a cooling function by passing cooling water or the like through the inside of the cylindrical body. When a cooling roll is used as the cooling means, the thermoplastic resin melt-extruded on the surface substrate may be directly contacted with the outer circumferential surface of the cooling roll to be cooled, or the surface substrate may be directly contacted with the outer circumferential surface of the cooling roll to indirectly cool the thermoplastic resin. In addition, in the cooling step, the melt-extruded thermoplastic resin may be cooled by air cooling.

[0112] FIG. 5 is an example showing a label manufacturing process. The laminating device in FIG. 5 includes unwinding rolls 31 and 44, cooling rolls 33 and 43, touch rolls 32 and 42, an extruder 37 having a T-die 35 which is a flat die, an extruder 47 having a T-die 45 which is a flat die, and a take-up roll 46. As shown in FIG. 5, the surface base material 11 is unwound from the unwinding roll 31 to the cooling roll 33. The touch roll 32 is a roll adjacent to the cooling roll 33 via a gap, and the gap distance between the touch roll 32 and the cooling roll 33 is adjustable. In the gap between the touch roll 32 and the cooling roll 33, the molten thermoplastic resin for forming the first thermoplastic resin layer is extruded in a film shape from the T-die 35. Then, in the gap between the touch roll 32 and the cooling roll 33, the surface base material 11 is pressure-bonded to the thermoplastic resin supplied in a film shape by the touch roll 32, and the thermoplastic resin is cooled by the cooling roll 33. As a result, a laminate 17 is formed in which the surface substrate 11 and the first thermoplastic resin layer 12 are laminated (enlarged view in FIG. 5A).

[0113] Cooling water is passed through the cooling roll 33, and the surface temperature is cooled to 5 to 30°C. The surface substrate 11 is unwound so that the surface for recording information comes into contact with the cooling roll 33. The temperature of the thermoplastic resin supplied from the T-die 35 is usually about 200 to 400°C. The gap between the cooling roll 33 and the touch roll 32 is adjusted so that the thermoplastic resin layer 12 has a desired thickness. When the surface substrate 11 is thermal paper, the surface temperature of the touch roll 32, the temperature of the thermoplastic resin supplied from the T-die 35, the gap between the touch roll 32 and the cooling roll 33, the winding speed of the laminate 17, and the like may be appropriately adjusted so that the thermal paper does not develop color.

[0114] (2) A step of laminating a second thermoplastic resin layer and an intermediate substrate on the laminate obtained in (1) to obtain a laminate of the surface substrate, the first thermoplastic resin layer, the second thermoplastic resin layer, and the intermediate substrate. The thermoplastic resin (or thermoplastic composition, hereinafter simply referred to as thermoplastic resin) constituting the second thermoplastic resin layer is melt-extruded onto the first thermoplastic resin layer. For example, the melt-extrusion method may be a method using a T-die. The melt-extrusion temperature is preferably 180°C or higher and 400°C or lower, more preferably 200°C or higher and 350°C or lower, and even more preferably 230°C or higher and 300°C or lower.

[0115] The melt-extruded thermoplastic resin is preferably cooled. For example, the thermoplastic resin that has been heated and melted can be cooled by contacting it with a cooling means such as a cooling roll. The cooling roll is as described above.

[0116] As shown in FIG. 5, the laminate 17 in which the surface substrate 11 and the first thermoplastic resin layer 12 are laminated is conveyed, and the laminate 17 is unwound onto the cooling roll 43. At the same time, the intermediate substrate 14 is unwound from the unwinding roll 44 onto the cooling roll 43. The touch roll 42 is adjacent to the cooling roll 43 via a gap, and the gap distance between the touch roll 42 and the cooling roll 43 is adjustable. In the gap between the touch roll 42 and the cooling roll 43, the molten thermoplastic resin is extruded in a film shape from a T-die 45. Then, in the gap between the touch roll 42 and the cooling roll 43, the laminate 17 and the intermediate substrate 14 are pressed against the thermoplastic resin supplied in a film shape, thereby forming a laminate 18 in which the laminate 17 (surface substrate 11, first thermoplastic resin 12), the second thermoplastic resin layer 13, and the intermediate substrate 14 are laminated in this order (enlarged view in FIG. 5B). This laminate 18 is taken up by a take-up roll 46.

[0117] Through these steps, the first thermoplastic resin layer is firmly bonded to the surface substrate. The second thermoplastic resin layer has a higher affinity to the first thermoplastic resin layer, which is the same thermoplastic resin, than the paper substrate when the layer is formed by melt extrusion, and the adhesive strength of the second thermoplastic resin layer is higher on the first thermoplastic resin layer surface than on the intermediate substrate surface. Therefore, the second thermoplastic resin layer and the intermediate substrate can be easily peeled off from each other.

[0118] (3) A step of providing an adhesive layer on the intermediate substrate side of the obtained laminate In this step, a composition for forming an adhesive layer containing polyvinyl alcohol or the like is applied onto the intermediate substrate of the laminate 18 .

[0119] As the adhesive layer-forming composition, for example, a composition containing water in addition to the above-mentioned components of the adhesive layer can be used.

[0120] This allows the adhesive layer-forming composition to be applied more suitably, and an adhesive layer of suitable thickness can be formed while preventing undesired thickness variations more suitably.

[0121] Examples of methods for applying the adhesive layer-forming composition include roll coating, bar coating, knife coating, roll knife coating, blade coating, die coating, and gravure coating.

[0122] After coating, the adhesive layer-forming composition is dried to form the adhesive layer 15. This removes moisture contained in the applied adhesive layer-forming composition, and the adhesive layer 15 is formed. Drying can be performed, for example, by natural drying or air drying, but is preferably performed by heating. The drying temperature is preferably 60°C or higher and 100°C or lower, and more preferably 70°C or higher and 90°C or lower.

[0123] (5) Processing The obtained laminate is appropriately cut or half-cut. In the half-cut process, cuts may be formed by a method using a blade or by a laser processing method.

[0124] Furthermore, for example, when the surface substrate 11 is thermal paper, information may be recorded using a thermal printer or the like.

[0125] [Label Usage] The label is used, for example, as a delivery slip. That is, the label is preferably a delivery slip label. Specifically, a half-cut line is provided up to the interface between the second thermoplastic resin layer of the label and the intermediate substrate, and the label is separated into a plurality of pieces so that the label can be peeled off. Then, one piece separated by the half-cut line is used as a delivery slip, and the other piece is used as a receipt. The 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 sorting the slips, etc.

[0126] When the label is a delivery slip label, the adherend may be, for example, a delivery item. A delivery item is usually composed of an item to be delivered and a packaging material for packaging the item. Examples of the packaging material include packaging paper, packaging film, packaging bags, packaging boxes, packaging containers, etc. Examples of the material of the packaging material include cardboard, paper, plastic, metal, etc., and cardboard and paper are particularly preferred. A delivery slip label is usually affixed to the packaging material of the delivery item.

[0127] Next, an embodiment will be described.

[0128] In the examples, a thermal paper having a thermal coloring layer (thickness 74 μm, basis weight 80 g / m 2 ) / First thermoplastic resin layer (low density polyethylene (density 918 kg / m 3 ) 99.9% by mass and 0.1% by mass of epoxidized soybean oil, thickness 12 μm) / second thermoplastic resin layer (low density polyethylene (density 917 Kg / m 3 ), thickness 17μm) / glassine paper (basis weight 35g / m 2 ) / adhesive layer (thickness 6 μm) laminate was obtained.

[0129] The first thermoplastic resin layer was formed as follows. The mixture was heated (230°C) and extruded onto the surface of the paper substrate opposite to the surface on which the thermosensitive coloring layer was formed using a T-die. Cooling water adjusted to 23°C was passed through a cooling roll, and the surface of the cooling roll was brought into contact with the first thermoplastic resin layer, thereby cooling and solidifying the molten first thermoplastic resin layer, and forming a first thermoplastic resin layer having a thickness of 12 μm on the paper substrate. Thereafter, a second thermoplastic resin layer was formed in the same manner by melt extrusion between the first thermoplastic resin layer and glassine paper using the above material. The adhesive layer was formed as follows. Polyvinyl alcohol was dissolved in water to prepare a composition for forming an adhesive layer with a solid content concentration of 15% by mass. As the polyvinyl alcohol, a mixture of polyvinyl alcohol A with a saponification degree of 88 mol% and a polymerization degree of 500 and polyvinyl alcohol B with a saponification degree of 88 mol% and a polymerization degree of 4500 in a mass ratio of 1:1 was used. The adhesive layer-forming composition was applied onto glassine paper and dried at 80° C. for 1 minute to form an adhesive layer, thereby obtaining a laminate (label).

[0130] In the laminate (label) thus formed, the second thermoplastic resin layer and the intermediate substrate were easily peelable from each other.

[0131] Although the label according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention. [Explanation of symbols]

[0132] 10, 30, 40 labels, 11 surface base material, 12 first thermoplastic resin layer, 13 second thermoplastic resin layer, 14 intermediate substrate, 15 Adhesive layer 31, 44 Pay-off roll, 32, 42 Touch roll, 33, 43 cooling roll, 46 take-up rolls.

Claims

1. A label having a surface substrate, an intermediate substrate, and an adhesive layer, a first thermoplastic resin layer and a second thermoplastic resin layer are disposed in this order between the surface substrate and the intermediate substrate; The second thermoplastic resin layer is peelable from the intermediate substrate; the intermediate substrate is a paper substrate; A label, wherein the adhesive constituting the adhesive layer is a remoistenable adhesive containing at least one adhesive selected from the group consisting of polyvinyl alcohol-based adhesives, starch-based adhesives, cellulose-based adhesives, and polyvinyl acetate-based adhesives.

2. The label of claim 1 , wherein the first thermoplastic resin layer comprises a polyolefin-based resin.

3. The label according to claim 2 , wherein the first thermoplastic resin layer is formed from a resin composition containing a functional group-containing polyolefin resin.

4. The label according to claim 3 , wherein the functional group is an epoxy group and / or a carboxy group.

5. The label according to claim 1 or 2, wherein the second thermoplastic resin layer comprises a polyolefin resin.

6. The label according to claim 5 , wherein the polyolefin resin contained in the second thermoplastic resin layer is a polyethylene resin.

7. The label according to claim 1 or 2, wherein the surface substrate is a paper substrate.

8. The label of claim 7, wherein the paper substrate is thermal paper.

9. 3. The label of claim 1 or 2, which is a shipping label.

10. The label of claim 1 or 2, wherein the intermediate substrate is glassine paper.

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