Fabric labels, heat-sealing materials, and fabric washing instructions

Abstract

The present invention provides a fabric label that can be heat-adhered to clothing and other materials and has excellent washability under strong alkaline conditions, a heat-sealing material used for the fabric label, and a method for washing fabrics. [Solution] A fabric label (1) comprising a base material (10), a heat-sensitive adhesive layer (20) containing a crystalline polyester resin provided on one surface of the base material (10), and an adhesive layer (30) laminated on the surface of the heat-sensitive adhesive layer (20) opposite to the base material (10).

Description

Technical Field

[0001] The present invention relates to a label for fabric, a heat-sealing material, and a method for washing fabric.

Background Art

[0002] Various tags are used to display information on clothing and the like. In dry cleaners, dry cleaning tags are attached to clothing and the like for the purpose of identifying and classifying the collected items. The same tags are also attached to users who regularly dry clean uniforms and linens.

[0003] Patent Document 1 discloses a label composed of a base material / hot-melt adhesive layer / adhesive layer, capable of printing on the surface of the base material, having the hot-melt adhesive layer covering the entire area with respect to the label area, and the adhesive layer partially existing at positions other than the end portions of the label on the surface of the hot-melt adhesive layer.

[0004] Patent Document 2 discloses a dry cleaning label composed of a base material / heat-sensitive adhesive layer / adhesive layer, capable of printing or typing on the surface of the base material, and having excellent dry-cleaning resistance.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] There is a demand for fabrics such as clothing with cleaning labels attached that can be washed with water, especially under strong alkaline conditions. However, conventional cleaning labels tend to peel off easily under strong alkaline conditions. Therefore, there is a need for materials with excellent wash resistance under strong alkaline conditions.

[0007] The present invention was made to solve the above-mentioned problems, and aims to provide a fabric label that can be heat-adhered to a substrate and has excellent washability under strong alkaline conditions, a heat-sealing material used for the fabric label, and a method for washing fabric. [Means for solving the problem]

[0008] The present invention includes the following embodiments. [1] A fabric label comprising a base material, a heat-sensitive adhesive layer containing a crystalline polyester resin provided on one surface of the base material, and an adhesive layer laminated on the surface of the heat-sensitive adhesive layer opposite to the base material side. [2] The fabric label according to [1], wherein the adhesive layer contains a polymer component (A), and the adhesive layer contains 1 part by mass or less of tackifying resin per 100 parts by mass of the polymer component (A). [3] The fabric label according to [1] or [2], wherein the thickness of the heat-sensitive adhesive layer is 50 μm or more. [4] The fabric label according to any one of [1] to [3], wherein the thickness of the adhesive layer is 5 μm or less. [5] A fabric label according to any one of [1] to [4], having a release liner on the side of the adhesive layer opposite to the side of the heat-sensitive adhesive layer. [6] The fabric label according to any one of items [1] to [5], wherein the fabric label is in the form of a roll. [7] A heat seal material comprising a heat-sensitive adhesive layer containing a crystalline polyester resin, and an adhesive layer laminated on one surface of the heat-sensitive adhesive layer. [8] The heat seal material described in [7] for heat-sensitive bonding to fabrics. [9] The heat seal material according to [7] or [8], wherein the adhesive layer contains a polymer component (A), and the content of the tackifying resin in the adhesive layer is 1 part by mass or less per 100 parts by mass of the polymer component (A).

[10] The heat seal material according to any one of [7] to [9], wherein the thickness of the heat-sensitive adhesive layer is 50 μm or more.

[11] The heat seal material according to any one of [7] to

[10] , wherein the thickness of the adhesive layer is 8 μm or less.

[12] The heat seal material according to any one of [7] to

[11] , having a release liner on the side of the adhesive layer opposite to the side of the heat-sensitive adhesive layer.

[13] A heat seal material according to any one of [7] to

[12] , having a release liner on the side of the heat-sensitive adhesive layer opposite to the adhesive layer side.

[14] The heat sealing material according to any one of [7] to

[13] , wherein the heat sealing material is in the form of a roll.

[15] A method for washing fabric, comprising immersing a fabric with a fabric label as described in any one of the items [1] to [4] in an alkaline solution. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a fabric label that can be heat-adhered to a substrate such as clothing and has excellent washability under strong alkaline conditions, a heat-sealing material used for the fabric label, and a method for washing fabric. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view of a fabric label according to an embodiment. [Figure 2] This is a cross-sectional view showing a release liner for a fabric label according to an embodiment. [Figure 3] This is a cross-sectional view of the heat seal material according to the embodiment. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments of the fabric label, heat-sealing material, and fabric washing method of the present invention will be described.

[0012] In this specification, "X to Y" indicating a range means "X or more and Y or less". Also, unless otherwise specified, operations, physical properties, etc. are measured under the conditions of room temperature (20 to 25°C) / relative humidity 45 to 55%RH.

[0013] ≪Fabric Label≫ The fabric label of the embodiment includes a base material, a heat-sensitive adhesive layer containing a crystalline polyester resin provided on one surface of the base material, and an adhesive layer laminated on the surface of the heat-sensitive adhesive layer opposite to the base material side. Since the fabric label of the embodiment includes a heat-sensitive adhesive layer containing a crystalline polyester resin, it can be heat-sensitively adhered to an adherend such as clothing and has excellent washability under strong alkaline conditions.

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the attached drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and duplicate descriptions are omitted. Also, the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios.

[0015] FIG. 1 is a cross-sectional view of the fabric label according to the embodiment. As shown in FIG. 1, the fabric label 1 according to the embodiment includes a base material 10, a heat-sensitive adhesive layer 20, an adhesive layer 30, and a release liner 40 in this order. Note that the release liner 40 is peeled off when the label is used and is not an essential component of the label of the present disclosure.

[0016] The fabric label of the embodiment (hereinafter sometimes simply referred to as "label") can be used by using a washable object as an adherend, attaching it thereto, and heat-sensitively adhering it. The objects to which the fabric labels are affixed are fabrics, and examples include clothing such as shirts, skirts, pants, hats, scarves, and socks, as well as bedding such as pillows and sheets, covers such as duvet covers and pillowcases, carpets, curtains, towels, blankets, shoes, bags, and work clothes. The fabric surface of the above-mentioned objects is preferred as the surface to which the labels are affixed. Fabric refers to all materials woven from natural or synthetic fibers.

[0017] In this specification, "laundry" refers to all methods of washing using water.

[0018] <Base material> Examples of the base material 10 of the label 1 according to this embodiment include film, cloth, nonwoven fabric, etc. Examples of films include resin films, with synthetic resin films being preferred. Examples of resin films include polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyolefin films such as polyethylene and polypropylene; polyamide films such as nylon; polyurethane films; polystyrene films; polylactic acid films; and cellulose films.

[0019] The substrate may be a film having micropores. Preferably, the film having micropores is at least one selected from the group consisting of foamed resin film, synthetic paper having micropores, and resin film having micropores. Having micropores makes the film white, which improves the visibility of laundry instructions and other markings.

[0020] Examples of cloths and nonwoven fabrics include those containing cellulose fibers such as hemp, wool, cotton, pulp, and rayon, as well as fibers such as nylon, polyester, polyurethane, and vinylon.

[0021] The type of weave of the fabric is not particularly limited; for example, satin such as polyester satin, and taffeta such as polyester taffeta and cotton taffeta can be cited.

[0022] The base material 10 may consist of a single layer or multiple layers. In the case of multiple layers, each layer may be the same or different.

[0023] The thickness of the base material 10 can be set as appropriate, for example, preferably 15 to 300 μm, more preferably 30 to 200 μm, and even more preferably 40 to 100 μm. By having the base material thickness within the above range, good washing resistance under strong alkaline conditions can be achieved.

[0024] In this specification, "thickness" is a value expressed as the average of thicknesses measured at five randomly selected locations, and can be obtained using a constant-pressure thickness measuring instrument in accordance with JIS K7130.

[0025] Here, the thickness of the substrate refers to the total thickness of the substrate. For example, if the substrate consists of multiple layers, the thickness refers to the sum of the thicknesses of all the layers that make up the substrate.

[0026] <Heat-sensitive adhesive layer> The fabric label according to this embodiment comprises a heat-sensitive adhesive layer containing a crystalline polyester resin provided on one surface of the substrate. The heat-sensitive adhesive layer in the label 1 according to this embodiment is a layer that has heat-sensitive adhesive properties and enables the label to be attached to an object by heat-sensitive adhesion. "Heat-sensitive adhesive properties" refers to the property that the heat-sensitive adhesive layer can be attached to an object such as fabric by heating and melting it, and then cooling and solidifying it. Examples of heat-sensitive bonding include heat and pressure bonding to the substrate using an iron or press (bonding by applying heat and pressure). The heat-sensitive adhesive layer is heated to a temperature above its melting point, and then cooled, causing the label to adhere to the substrate. By employing heat-sensitive adhesive, a strong bond to the substrate is achieved, resulting in a label with excellent wash resistance.

[0027] In the label 1 of this embodiment, an adhesive layer 30 is provided between the heat-sensitive adhesive layer 20 and the adherend. It is believed that when the label is heated or pressurized, the adhesive layer 30 deforms, exposing the heat-sensitive adhesive layer 20, which then adheres to the adherend.

[0028] The heat-sensitive adhesive layer contains a crystalline polyester resin and has heat-sensitive adhesive properties. The heat-sensitive adhesive layer does not exhibit adhesive properties at room temperature (23°C), for example, but exhibits adhesive properties when heated. The heating temperature of the heat-sensitive adhesive layer can be appropriately determined according to the composition of the heat-sensitive adhesive layer, and heat-sensitive adhesion can be achieved by heating it to a temperature above the melting point of the heat-sensitive adhesive layer.

[0029] The heat-sensitive adhesive layer preferably has a melting point of 180°C or lower, more preferably 50°C to 160°C, and even more preferably 70°C to 150°C. By keeping the melting point of the heat-sensitive adhesive layer below the above upper limit, the heat-sensitive adhesive strength is appropriately exhibited at practical heating temperatures, improving washability.

[0030] Preferably, the heat-sensitive adhesive layer is prepared by immersing it in a 1.5% by mass sodium hypochlorite aqueous solution at 60°C for one day, then removing the layer and measuring the weight change before and after immersion. The weight loss rate is preferably less than 5%. This results in superior washability under alkaline conditions for fabrics equipped with the aforementioned fabric labels.

[0031] The heat-sensitive adhesive layer may consist of a single layer or multiple layers. In the case of multiple layers, each layer may be identical or different.

[0032] The thickness of the heat-sensitive adhesive layer is not particularly limited, but is preferably 15 μm or more, more preferably 30 μm or more, and even more preferably 40 μm or more. A thickness of the heat-sensitive adhesive layer greater than or equal to the lower limit above results in superior washability. The thickness of the heat-sensitive adhesive layer is preferably 15 to 300 μm, more preferably 30 to 200 μm, and even more preferably 40 to 150 μm.

[0033] Here, the thickness of the heat-sensitive adhesive layer refers to the total thickness of the heat-sensitive adhesive layer. For example, if the heat-sensitive adhesive layer consists of multiple layers, the thickness refers to the sum of the thicknesses of all the layers that make up the heat-sensitive adhesive layer.

[0034] <Composition for forming a heat-sensitive adhesive layer> The heat-sensitive adhesive layer can be formed using a heat-sensitive adhesive layer forming composition containing the components that make up the heat-sensitive adhesive layer. The ratio of the content of each component in the heat-sensitive adhesive layer is usually the same as the ratio of the content of each component in the heat-sensitive adhesive layer forming composition, excluding the solvent.

[0035] The composition for forming the heat-sensitive adhesive layer can be applied by known methods, such as using various coaters including an air knife coater, blade coater, bar coater, gravure coater, roll coater, roll knife coater, curtain coater, die coater, knife coater, screen coater, Meyer bar coater, and kiss coater.

[0036] The heat-sensitive adhesive layer and the composition for forming the heat-sensitive adhesive layer contain a crystalline polyester resin. In the fabric label 1 of this embodiment, the heat-sensitive adhesive layer 20 contains a crystalline polyester resin, so it can be heat-adhered to a substrate such as clothing and has excellent washability under strong alkaline conditions.

[0037] In the composition for forming the heat-sensitive adhesive layer, the content of crystalline polyester resin is preferably 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more, based on the total mass of the composition for forming the heat-sensitive adhesive layer. When the content of crystalline polyester resin is above the lower limit of the above value, the washability under strong alkaline conditions is superior.

[0038] [Crystalline polyester resin] The crystalline polyester resin used in this disclosure is obtained by copolymerizing a copolymer component containing a polycarboxylic acid component and a polyol component as constituent raw materials.

[0039] [Polyhydric carboxylic acid components] Examples of the polycarboxylic acid component (A1) used in this disclosure include: Aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, benzylmalonic acid, diphenic acid, 4,4'-oxydibenzoic acid, and naphthalenedicarboxylic acid; Aliphatic dicarboxylic acids such as malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, trimethyladipic acid, pimelic acid, 2,2-dimethylglutaric acid, azelaic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid, thiodipropionic acid, and diglycolic acid; Alicyclic dicarboxylic acids such as 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 2,5-norbornanedicarboxylic acid, and adamantanedicarboxylic acid; Examples of divalent carboxylic acids include the following. These can be used individually or in combination of two or more.

[0040] [Polyol component (A2)] Examples of the polyol component (A2) used in this disclosure include: Aliphatic diols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 2,4-dimethyl-2-ethylhexane-1,3-diol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 2,2,4-trimethyl-1,6-hexanediol; Alicyclic diols such as 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, spiroglycol, tricyclodecanedimethanol, adamantanediol, and 2,2,4,4-tetramethyl-1,3-cyclobutanediol; Aromatic diols such as 4,4'-thiodiphenol, 4,4'-methylenediphenol, 4,4'-dihydroxybiphenyl, o-, m- and p-dihydroxybenzene, 2,5-naphthalenediol, p-xylenediol, and their ethylene oxide and propylene oxide adducts; Examples of dihydric alcohols include the following. These can be used individually or in combination of two or more.

[0041] Among these, aliphatic diols and alicyclic diols are preferred due to their excellent reactivity, and particularly preferred are ethylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol as aliphatic diols, and 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, and 1,4-cyclohexanedimethanol as alicyclic diols.

[0042] The preferred ratio of polycarboxylic acid component (A1) to polyol component (A2) is 1 to 2 equivalents of polyol component (A2) per equivalent of polycarboxylic acid component (A1), and particularly preferably 1.1 to 1.7 equivalents. If the content of polyol component (A2) is too low, the acid value tends to increase, making it difficult to increase the molecular weight, and if it is too high, the yield tends to decrease.

[0043] The crystalline polyester resin used in this disclosure is produced by arbitrarily selecting the above-mentioned polycarboxylic acid component (A1) and polyol component (A2) and subjecting them to a polycondensation reaction in the presence of a catalyst using a known method.

[0044] The number-average molecular weight of the crystalline polyester resin used in this disclosure is preferably 5,000 to 100,000, particularly preferably 10,000 to 100,000, and even more preferably 15,000 to 80,000, from the viewpoint of cohesive force, mechanical strength, etc.

[0045] The number-average molecular weight mentioned above is calculated based on the molecular weight of standard polystyrene and is measured using high-performance liquid chromatography (HLC-8220GPC, manufactured by Tosoh Corporation) with two TSKgelGMHXL columns in series.

[0046] The crystalline polyester resin used in this disclosure may be a commercially available product, for example, Byron® GM-1310 (melting point (Tm): 179℃), GM-400 (melting point (Tm): 143℃), GM-920 (melting point (Tm): 107℃) manufactured by Toyobo Co., Ltd., and Crystalline Hot Melt Type Nichigo Polyester® SP-154 (melting point (Tm): 120℃), SP-160 (melting point (Tm): 150℃), SP-170 (melting point (Tm): 85℃) manufactured by Mitsubishi Chemical Corporation.

[0047] <Adhesive layer> The adhesive layer 30 in the label 1 according to this embodiment has pressure-sensitive adhesive properties, and is a layer that allows the label to be attached to clothing or other objects by pressure-sensitive adhesion to the object to be attached. "Pressure-sensitive adhesive properties" refer to the property of being able to adhere to an object by applying pressure to the adhesive layer. Note that pressure-sensitive adhesion and adhesiveness are used interchangeably. The presence of an adhesive layer in the label provides the ability to be temporarily attached to clothing or other items prior to heat bonding using a heat-sensitive adhesive layer with a press or similar device. This ability to temporarily attach the label makes it easier to accurately adhere it to the desired position on the object to which it will be heat-bonded.

[0048] The composition of the adhesive layer is not particularly limited and can be made of known adhesives. In the label according to this embodiment, the adhesive layer contains a polymer component (A), and the ratio of the content of the tackifying resin to 100 parts by mass of polymer component (A) in the adhesive layer is 1 part by mass or less. The polymer component is a component that can be considered to have been formed by a polymerization reaction of a polymerizable compound. The ratio of the polymer component (A) content to the total mass of the adhesive layer may be 50-100% by mass, 60-100% by mass, or 70-100% by mass. The following describes the tackifying resin and polymer components.

[0049] • Adhesive resin In this specification, "tackifying resin" refers to a substance that, when added to an adhesive layer, has the function of improving the adhesive performance of the adhesive layer. Tackifying resin is also called a tackifier.

[0050] The tackifying resin may be a polymer. The weight-average molecular weight of the tackifying resin may be, for example, 5000 or less, 100 to 5000, 200 to 3000, or 300 to 1000. The weight-average molecular weight can be the polystyrene equivalent value measured by gel permeation chromatography (GPC).

[0051] The tackifying resin is not particularly limited and includes petroleum resin-based tackifying resins: rosin-based tackifying resins such as rosin and rosin derivatives; terpene-based tackifying resins such as terpene resins, hydrogenated terpene resins, terpene phenol resins, and aromatically modified terpene resins; and other liquid resins, resin emulsions, alkylphenol resins, carbolic acid resins, vinyl acetate resins, styrene resins, etc., that can be used as tackifying resins.

[0052] The tackifying resin may be at least one tackifying resin selected from the group consisting of petroleum resin-based tackifying resins, styrene-based tackifying resins, terpene-based tackifying resins, and rosin-based tackifying resins. Furthermore, these tackifying resins may be used individually or in combination of two or more types.

[0053] In the embodiment, the adhesive layer preferably contains less than 10 parts by mass of tackifying resin per 100 parts by mass of polymer component (A), more preferably 4 parts by mass or less, and even more preferably 1 part by mass or less. It is particularly preferable that the adhesive layer substantially does not contain tackifying resin. From a similar viewpoint, in the embodiment, the adhesive layer may have a tackifying resin content ratio of less than 9% by mass, 4% by mass or less, 3% by mass or less, or 1% by mass or less relative to the total mass of the adhesive layer, and it is particularly preferable that the adhesive layer substantially does not contain tackifying resin. The absence of tackifying resin in the adhesive layer results in better washability.

[0054] The adhesive layer may consist of one layer (single layer) or two or more layers, but it is preferable to have one layer from the viewpoint of simplifying the manufacturing process. If it consists of multiple layers, these layers may be the same or different from each other, and there are no particular limitations on the combination of these layers.

[0055] The thickness of the adhesive layer is not particularly limited, but is preferably 50 μm or less, more preferably 30 μm or less, even more preferably 10 μm or less, and particularly preferably 8 μm or less. A thickness of the adhesive layer below the above upper limit results in superior washability. The thickness of the adhesive layer is preferably 0.5 to 50 μm, more preferably 0.8 to 30 μm, even more preferably 1.0 to 10 μm, and particularly preferably 1.0 to 8 μm.

[0056] In this specification, "thickness" is expressed as the average of thicknesses measured at five randomly selected locations. The value can be obtained using a constant-pressure thickness measuring instrument in accordance with JIS K7130.

[0057] Here, the thickness of the adhesive layer refers to the total thickness of the adhesive layer. For example, the thickness of an adhesive layer consisting of multiple layers refers to the total thickness of all the layers that make up the adhesive layer.

[0058] The initial adhesive strength of the adhesive layer is preferably 0.2 to 20 N / 20 mm, more preferably 0.4 to 15 N / 20 mm, and even more preferably 0.5 to 15 N / 20 mm, measured in accordance with JIS K6854-3:1999 at a peeling speed of 300 mm / min, when measured as a T-shaped peel adhesive strength between the adhesive layer and the cotton cloth. Note that the initial adhesive strength here refers to the adhesive strength of the adhesive layer 30 minutes after the label has been applied and before heat-pressing (for labels that have not been heat-pressed). If the initial adhesive strength of the adhesive layer is above the lower limit, it is suitable for temporary fixing to the adherend, and if it is below the upper limit, it is preferable because it allows for easy re-peeling.

[0059] <Composition for forming adhesive layer> The adhesive layer can be formed using an adhesive layer-forming composition containing the components that make up the adhesive layer. The ratio of the content of each component in the adhesive layer is usually the same as the ratio of the content of each component in the adhesive layer-forming composition, excluding the solvent.

[0060] The adhesive layer-forming composition can be applied by known methods, such as using various coaters including air knife coaters, blade coaters, bar coaters, gravure coaters, roll coaters, roll knife coaters, curtain coaters, die coaters, knife coaters, screen coaters, Meyer bar coaters, and kiss coaters.

[0061] • Polymer components Examples of polymer component (A) include known adhesive resins such as acrylic resins, urethane resins, rubber resins, silicone resins, epoxy resins, polyvinyl ethers, polycarbonates, and ester resins, with acrylic resins being preferred.

[0062] Examples of the acrylic resin include acrylic polymers having at least one structural unit derived from an alkyl (meth)acrylate, and it is preferable that the polymer component (A) contains an acrylic polymer. The ratio of the acrylic polymer content to the total mass of the heat-sensitive adhesive layer may be 50-100% by mass, 60-100% by mass, or 70-100% by mass. The constituent units of the acrylic polymer may consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected.

[0063] In this specification, "(meth)acrylic acid" is a concept that encompasses both "acrylic acid" and "methacrylic acid." The same applies to terms similar to (meth)acrylic acid.

[0064] Examples of the alkyl (meth)acrylate ester include those in which the alkyl group constituting the alkyl ester has 1 to 20 carbon atoms, and the alkyl group is preferably linear or branched. More specifically, alkyl methacrylates include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl methacrylate, 2-ethylhexyl methacrylate, isooctyl methacrylate, n-octyl methacrylate, and n-butyl methacrylate. Examples include nonyl, isononyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl ((meth)acrylate) (lauryl (meth)acrylate), tridecyl (meth)acrylate, tetradecyl ((meth)acrylate) (myristyl (meth)acrylate), pentadecyl (meth)acrylate, hexadecyl ((meth)acrylate) (palmityl (meth)acrylate), heptadecyl (meth)acrylate, octadecyl ((meth)acrylate) (stearyl (meth)acrylate), nonadecyl (meth)acrylate, and eicosyl (meth)acrylate.

[0065] From the viewpoint of improving the adhesive strength of the adhesive layer, the acrylic polymer preferably has constituent units derived from an alkyl (meth)acrylate ester in which the alkyl group has 4 or more carbon atoms. Furthermore, from the viewpoint of further improving the adhesive strength of the adhesive layer, the number of carbon atoms in the alkyl group is preferably 4 to 12, and more preferably 4 to 8. In addition, the alkyl (meth)acrylate ester in which the alkyl group has 4 or more carbon atoms is preferably an alkyl acrylate ester.

[0066] The acrylic polymer preferably has, in addition to structural units derived from alkyl (meth)acrylate esters, structural units derived from functional group-containing monomers. As for the functional group-containing monomer, for example, the functional group reacts with a crosslinking agent described later to serve as the starting point for crosslinking.

[0067] Examples of the functional groups in the functional group-containing monomer include hydroxyl groups, carboxyl groups, amino groups, epoxy groups, and the like. In other words, examples of functional group-containing monomers include hydroxyl group-containing monomers, carboxyl group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, and the like.

[0068] Examples of the hydroxyl group-containing monomers include hydroxyalkyl (meth)acrylates such as hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate; and non-(meth)acrylic unsaturated alcohols such as vinyl alcohol and allyl alcohol (unsaturated alcohols that do not have a (meth)acryloyl skeleton).

[0069] Examples of the carboxyl group-containing monomers include ethylenically unsaturated monocarboxylic acids (monocarboxylic acids having an ethylenically unsaturated bond) such as (meth)acrylic acid and crotonic acid; ethylenically unsaturated dicarboxylic acids (dicarboxylic acids having an ethylenically unsaturated bond) such as fumaric acid, itaconic acid, maleic acid, and citraconic acid; anhydrides of the ethylenically unsaturated dicarboxylic acids; and carboxyalkyl esters of (meth)acrylic acid such as 2-carboxyethyl methacrylate.

[0070] Of the functional group-containing monomers, carboxyl group-containing monomers are preferred.

[0071] The functional group-containing monomers constituting the acrylic polymer may consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected.

[0072] In the acrylic polymer, the content of constituent units derived from functional group-containing monomers is preferably 1 to 35% by mass, more preferably 2 to 32% by mass, and particularly preferably 3 to 30% by mass, based on the total amount of constituent units.

[0073] The acrylic polymer may have structural units derived from other monomers, in addition to structural units derived from alkyl (meth)acrylate esters and structural units derived from functional group-containing monomers. The other monomers mentioned above are not particularly limited as long as they can be copolymerized with alkyl (meth)acrylate esters, etc. Examples of the other monomers mentioned above include styrene, α-methylstyrene, vinyltoluene, vinyl formate, vinyl acetate, acrylonitrile, and acrylamide.

[0074] The other monomers constituting the acrylic polymer may consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected.

[0075] The glass transition temperature (Tg) of polymer component (A) is preferably -40°C or lower, more preferably -70°C to -40°C, and even more preferably -60°C to -55°C. Having a Tg of polymer component (A) below the above upper limit improves adhesion to the substrate. Instead of increasing the content of tackifying resin in the adhesive layer, the pressure-sensitive adhesion of the adhesive layer can be improved by lowering the glass transition temperature (Tg) of the polymer component (A).

[0076] The glass transition temperature (Tg) of polymer component (A) can be calculated using Fox's equation shown below. 1 / Tg = (W1 / Tg1) + (W2 / Tg2) + ... + (Wm / Tgm) (wherein Tg is the glass transition temperature of the polymer component, Tg1, Tg2, ..., Tgm are the glass transition temperatures of the homopolymer of each monomer component of the polymer, and W1, W2, ..., Wm are the mass fractions of each monomer. However, W1 + W2 + ... + Wm = 1.) The glass transition temperatures of each monomer homopolymer in the Fox formula can be those listed in the Polymer Data Handbook, Adhesion Handbook, or Polymer Handbook. For example, the Tg of methyl acrylate homopolymer is 10°C, the Tg of 2-hydroxyethyl acrylate homopolymer is -15°C, the Tg of 2-ethylhexyl acrylate homopolymer is -70°C, and the Tg of 2-ethylhexyl methacrylate is -10°C.

[0077] It is preferable that the content of constituent units derived from 2-ethylhexyl acrylate is 50% by mass or more, more preferably 50 to 70% by mass, and even more preferably 55 to 65% by mass, based on 100% by mass of the polymer component (A). As described above, since 2-ethylhexyl acrylate has a low Tg, by setting the content of constituent units derived from 2-ethylhexyl acrylate in polymer component (A) to or above the lower limit, the pressure-sensitive adhesion of the adhesive layer can be effectively enhanced.

[0078] The adhesive layer can be formed using an adhesive composition containing the components that make up the adhesive layer. Preferably, the adhesive composition further contains a crosslinking agent in addition to the polymer component (A).

[0079] Examples of crosslinking agents include isocyanate-based crosslinking agents (crosslinking agents having an isocyanate group) such as tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, and adducts of these diisocyanates; epoxy-based crosslinking agents (crosslinking agents having a glycidyl group) such as ethylene glycol glycidyl ether; aziridine-based crosslinking agents (crosslinking agents having an aziridinyl group) such as hexa[1-(2-methyl)-aziridinyl]triphosphate triazine; metal chelate-based crosslinking agents (crosslinking agents having a metal chelate structure) such as aluminum chelate; and isocyanurate-based crosslinking agents (crosslinking agents having an isocyanuric acid skeleton). In addition, melamine compounds, hydrazide compounds, oxazoline compounds, carbodiimide compounds, urea compounds, dialdehyde compounds, metal alkoxides, and metal salts can also be used.

[0080] Examples of aluminum chelating compounds include diisopropoxyaluminum monooleyl acetate, monoisopropoxyaluminum bisoleyl acetate, monoisopropoxyaluminum monooleate monoethyl acetate, diisopropoxyaluminum monolauryl acetate, diisopropoxyaluminum monostearyl acetate, diisopropoxyaluminum monoisostearyl acetate, monoisopropoxyaluminum mono-N-lauroyl-β-aranate monolauryl acetate, aluminum trisacetylacetonate, monoacetylacetonate aluminum bis(isobutyl acetate) chelate, monoacetylacetonate aluminum bis(2-ethylhexyl acetate) chelate, monoacetylacetonate aluminum bis(dodecyl acetate) chelate, and monoacetylacetonate aluminum bis(oleyl acetate) chelate.

[0081] Commercially available products may be used as crosslinking agents, such as Takenate D-101E (manufactured by Mitsui Chemicals, Inc., a trimethylolpropane adduct of tolylene diisocyanate).

[0082] The crosslinking agent contained in the adhesive composition may be one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected.

[0083] The crosslinking agent content in the adhesive composition is preferably 0.1 parts by mass or more and 10 parts by mass or less, more preferably 0.5 parts by mass or more and 5 parts by mass or less, and even more preferably 0.8 parts by mass or more and 3 parts by mass or less, based on 100 parts by mass of polymer component (A).

[0084] <Second adhesive layer> The fabric label according to the embodiment may have a second adhesive layer between the heat-sensitive adhesive layer and the substrate. The presence of the second adhesive layer can improve the adhesion between the heat-sensitive adhesive layer and the substrate. Examples of the second adhesive layer include those described above as the first adhesive layer (hereinafter sometimes referred to as the first adhesive layer to distinguish it from the second adhesive layer).

[0085] <Removable Liner> The adhesive layer 30 can be formed on a release liner. Alternatively, the fabric label 1 can be provided in a form in which the base material 10, the heat-sensitive adhesive layer 20, the adhesive layer 30, and the release liner 40 are laminated in that order, as shown in Figure 1. The release liner 40 may have a release substrate 41 and a release agent layer 42, as shown in Figure 2.

[0086] Examples of the laminated thermoplastic resins include olefin resins with α-olefins as monomer components, such as polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), ethylene-propylene copolymer, and ethylene-vinyl acetate copolymer (EVA); polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT); polyvinyl chloride (PVC); vinyl acetate resins; polycarbonate (PC); polyphenylene sulfide (PPS); amide resins such as polyamide (nylon) and fully aromatic polyamide (aramid); thermoplastic polyimide resins; and polyether ether ketone (PEEK). These materials may be used individually or in combination of two or more. Among these, the thermoplastic resin is preferably polyolefin, and more preferably polyethylene. The thickness of the thermoplastic resin laminate layer is, for example, 10 to 40 μm.

[0087] Examples of paper substrates include glassine paper and high-quality paper.

[0088] Polyester-based films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) can be used.

[0089] The thickness of the release liner 40 is preferably 25 to 250 μm. Setting the thickness of the release liner 40 above the lower limit improves the suitability of the fabric label for die-cutting. Setting the thickness of the release liner 40 below the upper limit improves the peelability of the release liner 40 from the adhesive layer 30 during the application process.

[0090] Examples of the release agent layer 42 include rubber elastomers such as silicone, olefin resins, isoprene resins, and butadiene resins, as well as long-chain alkyl resins, long-chain alkyl acrylate resins, alkyd resins, and fluorine resins. Among these, silicone is preferred. The thickness of the release agent layer is usually about 0.01 to 5 μm.

[0091] (Thickness of fabric labels) The thickness of the fabric label can be set as appropriate, for example, preferably 16 to 400 μm, more preferably 35 to 300 μm, even more preferably 50 to 200 μm, and particularly preferably 70 to 120 μm. Having the fabric label thickness within the above range ensures good washability.

[0092] (Thickness ratio of the adhesive layer to the heat-sensitive adhesive layer) The thickness of the heat-sensitive adhesive layer is preferably greater than the thickness of the adhesive layer. The thickness ratio, expressed as [thickness of adhesive layer] / [thickness of heat-sensitive adhesive layer], is preferably 0.01 to 0.5, more preferably 0.02 to 0.3, and even more preferably 0.03 to 0.2. If the thickness ratio is below the upper limit of the above range, the heat-sensitive adhesive layer will adhere more easily to the substrate by heating or pressurizing, thereby improving washability. If it is above the lower limit of the above range, sufficient initial adhesive strength can be obtained.

[0093] <Method for manufacturing fabric labels> First, the method for manufacturing the label related to this disclosure will be explained below using the method for manufacturing fabric label 1 as an example. The manufacturing method for the fabric label 1 of this embodiment includes providing a heat-sensitive adhesive layer 20 on one surface of a base material 10, and providing an adhesive layer 30 on the surface of the heat-sensitive adhesive layer 20 opposite to the side on which the base material 10 is laminated.

[0094] For example, a heat-sensitive adhesive layer component, which has been heated and melted, is applied onto a substrate 10 using a coating machine such as a roll coater, knife coater, roll knife coater, air knife coater, die coater, bar coater, gravure coater, or curtain coater to obtain a laminate A in which the substrate 10 and the heat-sensitive adhesive layer 20 are laminated together.

[0095] Furthermore, an adhesive layer forming composition containing the components constituting the adhesive layer 30 and optionally a solvent is prepared on top of the release liner 40, and the adhesive layer forming composition is applied to the release treatment surface of the release liner 40 using a coating machine and dried to obtain a laminate B in which the release liner 40 and the adhesive layer 30 are laminated.

[0096] Next, the exposed surface of the heat-sensitive adhesive layer 20 of the laminate A manufactured above and the exposed surface of the adhesive layer 30 of the laminate B are pressed together, thereby manufacturing a label 1 in which the base material 10, the heat-sensitive adhesive layer 20, the adhesive layer 30, and the release liner 40 are laminated in this order.

[0097] After the adhesive layer is formed, a cross-linked structure can be formed by the cross-linking agent contained in the adhesive layer-forming composition by, for example, leaving it undisturbed at room temperature for about 7 days.

[0098] Alternatively, the fabric label 1 of the embodiment can be manufactured using a heat-seal material 2 comprising a release liner 401, a heat-sensitive adhesive layer 20, an adhesive layer 30, and a release liner 40 in that order, as described later. The release liner 401 is peeled off from the heat seal material 2, and the exposed surface of the heat-sensitive adhesive layer 20 is heated and pressed against the base material 10, thereby manufacturing a label 1 in which the base material 10, the heat-sensitive adhesive layer 20, the adhesive layer 30, and the release liner 40 are laminated in this order.

[0099] <How to apply fabric labels> The method for applying a fabric label according to this disclosure includes the steps of bringing the adhesive layer side of the fabric label according to the above embodiment into contact with an object to be adhered to, and heating the fabric label to heat-bond the heat-sensitive adhesive layer to the object to be adhered.

[0100] The process may include a step of pressure-bonding a fabric label to the substrate before the step of heat-bonding the heat-sensitive adhesive layer to the substrate. In the process of pressure-bonding fabric labels, the adhesive layer is brought into contact with the object to be attached, which is an object that can be washed, and then pressed down to adhere it.

[0101] In the process of applying the heat-sensitive adhesive layer to the substrate, the fabric label is heated to adhere the heat-sensitive adhesive layer to the substrate. The application method can be heat-pressure bonding (bonding by applying heat and pressure) using an iron or press. The application temperature can be appropriately determined according to the composition of the heat-sensitive adhesive layer, and the heat-sensitive adhesive properties can be achieved by heating to a temperature above the melting point of the heat-sensitive adhesive layer. The pressure applied to the label can be 0.1 to 10 kgf / cm². 2 The degree can be illustrated with examples.

[0102] The fabric label of the embodiment can be printed or inscribed on its surface. The printing or inscription may be applied to the surface of the substrate. Known printing devices can be used for printing or inscription. The printing or marking may be performed before or after the label of the embodiment is affixed to the substrate.

[0103] The following configuration can be given as an example of a preferred use for the fabric label of the embodiment.

[0104] The fabric label of the embodiment has printing or markings on the base material, and the information printed or marked may be one or more types of object information selected from the group consisting of owner information, washing instructions, washing symbols, size, handling precautions including washing or dry cleaning methods, material type, fiber composition, and the name of the person who displays them, for an object to be washed with the fabric label attached.

[0105] Labels containing the above-mentioned object information can be used as quality labels, affixed to items to be washed and then washed together with the items. Labels containing owner information can be used as cleaning labels or as labels displaying names, titles, logos, etc.

[0106] Cleaning labels and quality labels are included in the fabric labels of the embodiment.

[0107] The fabric labels of this embodiment can be provided as single sheets or as rolls.

[0108] <Uses of fabric labels> The fabric label of this embodiment can be used in processing steps for fabrics that require washing under strong alkaline conditions. For example, by attaching the label to the fabric in the manner described above, it is possible to obtain a labeled fabric that can be washed under strong alkaline conditions.

[0109] Examples of strong alkaline cleaning solutions include aqueous sodium hypochlorite solutions with a concentration of 1.0% by mass or higher, and aqueous sodium hypochlorite solutions with a concentration of 1.5% by mass or higher are more preferred.

[0110] Heat sealing material The heat-seal material of the embodiment comprises a heat-sensitive adhesive layer containing a crystalline polyester resin and an adhesive layer laminated on one surface of the heat-sensitive adhesive layer. The heat-seal material of the embodiment can be used in the fabric label 1 according to the above embodiment.

[0111] Figure 3 is a cross-sectional view of a heat seal material according to an embodiment. As shown in Figure 3, the heat seal material 2 according to the embodiment comprises a release liner 401, a heat-sensitive adhesive layer 20, an adhesive layer 30, and a release liner 40 in that order. Note that the release liner 401 and the release liner 40 are peeled off when the heat seal material 2 is used and are not essential components of the label in this disclosure.

[0112] The heat-sensitive adhesive layer 20 and adhesive layer 30 in the heat-seal material 2 are the same as those in the fabric label 1. The release liner 401 and release liner 40 in the heat-seal material 2 can be the same as those in the fabric label 1.

[0113] The heat-sealing material of the embodiment can be provided in sheet form or in roll form. The heat-sealing material of the embodiment has excellent storage stability when stored in roll form.

[0114] <Manufacturing method for heat seal material> First, the method for manufacturing the label related to this disclosure will be explained below, using the method for manufacturing the heat-seal material 2 as an example. The manufacturing method of the heat seal material 2 of the embodiment includes providing a heat-sensitive adhesive layer 20 on one surface of the release liner 401, and providing an adhesive layer 30 on the surface of the heat-sensitive adhesive layer 20 opposite to the side on which the release liner 401 is laminated.

[0115] For example, a laminate A is obtained in which the release liner 401 and the heat-sensitive adhesive layer 20 are laminated together by applying the components constituting the heat-sensitive adhesive layer, which have been heated and melted, onto the release liner 401 using a coating machine.

[0116] Furthermore, an adhesive layer forming composition containing the components constituting the adhesive layer 30 and optionally a solvent is prepared on top of the release liner 40, and the adhesive layer forming composition is applied to the release treatment surface of the release liner 40 using a coating machine and dried to obtain a laminate B in which the release liner 40 and the adhesive layer 30 are laminated.

[0117] Next, the exposed surface of the heat-sensitive adhesive layer 20 of the laminate A manufactured above and the exposed surface of the adhesive layer 30 of the laminate B are heated and pressed together to produce a heat seal material 2 in which the release liner 401, the heat-sensitive adhesive layer 20, the adhesive layer 30, and the release liner 40 are laminated in this order.

[0118] After the adhesive layer is formed, a cross-linked structure can be formed by the cross-linking agent contained in the adhesive layer-forming composition by, for example, leaving it undisturbed at room temperature for about 7 days.

[0119] ≪How to wash fabrics≫ The fabric washing method of the embodiment includes immersing the fabric to which the fabric label of the embodiment described above is attached in an alkaline solution. Since the fabric label of the embodiment described above comprises a heat-sensitive adhesive layer containing crystalline polyester resin, it has excellent washability under strongly alkaline conditions. [Examples]

[0120] The present disclosure will now be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[0121] <Raw materials for manufacturing adhesive layer-forming compositions> The raw materials used in the production of the adhesive layer forming composition in this embodiment and reference example are as follows.

[0122] (Polyester resin) [Polyester resin for heat-sensitive adhesive layer] • Crystalline polyester resin (manufactured by Toyobo Co., Ltd., Byron® GM-400 (melting point (Tm): 143℃)) Amorphous polyester resin (manufactured by Mitsubishi Chemical Corporation, amorphous solvent-soluble Nichigo Polyester® LP-011 (Tg: 4℃)). [Polyester resin for adhesive layer] • Acrylic acid ester copolymer (n-butyl acrylate / acrylic acid = 92 parts by mass / 8 parts by mass, calculation of polymer components Tg: -47℃, weight-average molecular weight (Mw): 500,000) • Isocyanate-based crosslinking agent (manufactured by Mitsui Chemicals, Inc., Takenate® D-101E)

[0123] <Making fabric labels> <Example 1> A crystalline polyester resin (Toyobo Co., Ltd., Byron® GM-400 (melting point (Tm): 143℃)) was sandwiched between two release liners (glassine paper coated with silicone), and pressed with a press machine (manual hydraulic test press, IMC-18E7, manufactured by Imoto Seisakusho Co., Ltd.) at 180℃ to obtain a laminate 1 consisting of a release liner / thermo-adhesive layer / release liner. One of the release liners was peeled off, and cloth 1 (Kanakin No. 3, obtained from the Japanese Standards Association) was placed on the exposed thermo-adhesive layer and pressed with a press machine set to 180℃ to adhere it, obtaining a laminate 2 consisting of cloth 1 / thermo-adhesive layer / release liner. Next, composition 1 for forming an adhesive layer was prepared by mixing 1 part by mass of an isocyanate-based crosslinking agent (Takenate D-101E, manufactured by Mitsui Chemicals, Inc.) with 100 parts by mass of solids of an acrylic ester copolymer (n-butyl acrylate / acrylic acid = 92 / 8). The prepared composition 1 for forming an adhesive layer was applied to a release liner (glassine paper coated with silicone) to a thickness of 2 μm after drying, and dried at 90°C for 1 minute to obtain an adhesive layer. The other release liner of the laminate 2 obtained above was peeled off, and the exposed heat-sensitive adhesive layer and the adhesive layer obtained above were bonded together to obtain the label of Example 1, consisting of cloth 1 / heat-sensitive adhesive layer / adhesive layer / release liner.

[0124] <Examples 2-4> Labels for Examples 2 to 4 were obtained in the same manner as in Example 1, except that the thickness of the heat-sensitive adhesive layer was 70 μm (Example 2), 50 μm (Example 3), and 40 μm (Example 4).

[0125] <Examples 5-7> Labels for Examples 5 and 6 were obtained in the same manner as in Example 1, except that the thickness of the adhesive layer was 5 μm (Example 5), 8 μm (Example 6), and 10 μm (Example 7).

[0126] <Example 8> The label of Example 7 was obtained in the same manner as in Example 1, except that, as the adhesive layer forming composition for forming the adhesive layer, Adhesive layer forming composition 2 was used, which was prepared by mixing 100 parts by mass of solids of acrylic ester copolymer (n-butyl acrylate / acrylic acid = 92 / 8) with 1 part by mass of isocyanate crosslinking agent (Takenate D-101E manufactured by Mitsui Chemicals, Inc.) and 10 parts by mass of solids of tackifying resin (Super Ester A-100 manufactured by Arakawa Chemical Industries, Ltd.) to form the adhesive layer, instead of adhesive layer forming composition 1.

[0127] <Reference example 1> An amorphous polyester solution (LP-011, manufactured by Mitsubishi Chemical Corporation) was applied to a release liner (glassine paper coated with silicone) to a thickness of 100 μm after drying, and dried at 90°C for 1 minute to form a heat-sensitive adhesive layer. Cloth 1 (Kanakin No. 3, obtained from the Japanese Standards Association) was placed on top of the heat-sensitive adhesive layer and attached by rolling a 2 kg rubber roller back and forth once. The release liner was peeled off the heat-sensitive adhesive layer and bonded to the adhesive layer formed in the same manner as in Example 1 to obtain the label of Reference Example 1.

[0128] Table 1 shows the configuration of the heat-sealing material from the above examples and reference examples. In the table, adhesives 1 and 2 represent adhesive layer-forming compositions 1 and 2.

[0129] [Table 1]

[0130] [Material property evaluation] The labels manufactured using the above examples and reference materials were evaluated for the following physical properties.

[0131] ·Thermocompression adhesion The release liner of the labels obtained in the examples and reference examples was peeled off, and cloth 2 (Kanakin No. 3, obtained from the Japanese Standards Association) was placed on the exposed heat-sensitive adhesive layer. A heat-sealing machine (Heat Seal TP-701, manufactured by Tester Industries Co., Ltd.) was used to apply a load of 220 gf / cm². 2 The material was heated at 180°C for 11 seconds to obtain a test specimen. A T-shaped peel test was performed by hand immediately after specimen preparation. The evaluation criteria are shown below. A: Not removable. F: Can be peeled off by hand.

[0132] • Washability under alkaline conditions The release liner of the labels obtained in the examples and reference examples was peeled off, and cloth 2 (Kanakin No. 3, obtained from the Japanese Standards Association) was placed on the exposed heat-sensitive adhesive layer. A heat-sealing machine (Heat Seal TP-701, manufactured by Tester Industries Co., Ltd.) was used to apply a load of 220 gf / cm². 2 The specimen was then heated at 180°C for 11 seconds to obtain the test piece. The test specimen was placed in a 1.5% by mass sodium hypochlorite aqueous solution at 60°C and stirred at 500 rpm for 30 minutes. This test was repeated (up to a maximum of 50 times), and the number of times until the specimen peeled off was determined.

[0133] • Solubility in alkaline solutions The weight of the heat-sensitive adhesive layer obtained in the examples and reference examples was measured. Then, the heat-sensitive adhesive layer was placed in a 1.5% by mass sodium hypochlorite aqueous solution and immersed at 60°C for 1 day. The heat-sensitive adhesive layer was removed from the aqueous solution, dried at 120°C for 2 hours, and its weight was measured. Solubility was confirmed by the change in weight before and after immersion. Solubility in alkaline solutions was evaluated according to the following criteria. A: Weight loss after immersion is less than 5% F: Weight loss of 5% or more after immersion

[0134] Table 2 shows the results of the physical property evaluation of the labels in the above examples and reference examples.

[0135] [Table 2]

[0136] The labels in Examples 1-8 were heat-adherible to the substrate and exhibited excellent wash resistance under strong alkaline conditions.

[0137] Each configuration and combination thereof in each embodiment is an example, and additions, omissions, substitutions, and other modifications are possible without departing from the spirit of this disclosure. Furthermore, this disclosure is not limited by each embodiment, but is limited only by the scope of the claims. [Explanation of Symbols]

[0138] 1...Fabric label, 2...Heat seal material, 10...Base material, 20...Heat-sensitive adhesive layer, 30...Adhesive layer, 40, 401...Release liner, 41...Release substrate, 42...Release layer

Claims

1. A label for fabric, comprising a base material, a heat-sensitive adhesive layer containing a crystalline polyester resin provided on one surface of the base material, and an adhesive layer laminated on the surface of the heat-sensitive adhesive layer opposite to the base material side.

2. The fabric label according to claim 1, wherein the adhesive layer contains a polymer component (A), and the adhesive layer contains 1 part by mass or less of tackifying resin per 100 parts by mass of the polymer component (A).

3. The fabric label according to claim 1, wherein the thickness of the heat-sensitive adhesive layer is 50 μm or more.

4. The fabric label according to claim 1, wherein the thickness of the adhesive layer is 8 μm or less.

5. A fabric label according to any one of claims 1 to 4, wherein the adhesive layer has a release liner on the side opposite to the heat-sensitive adhesive layer.

6. The fabric label according to any one of claims 1 to 4, wherein the fabric label is in the form of a roll.

7. A heat-sealing material comprising a heat-sensitive adhesive layer containing a crystalline polyester resin, and an adhesive layer laminated on one surface of the heat-sensitive adhesive layer.

8. A heat seal material according to claim 7, for heat-sensitive bonding to fabric.

9. The heat seal material according to claim 7 or 8, wherein the adhesive layer contains a polymer component (A), and the content of the tackifying resin in the adhesive layer is 1 part by mass or less per 100 parts by mass of the polymer component (A).

10. The heat seal material according to claim 7 or 8, wherein the thickness of the heat-sensitive adhesive layer is 50 μm or more.

11. The heat seal material according to claim 7 or 8, wherein the thickness of the adhesive layer is 8 μm or less.

12. The heat seal material according to claim 7 or 8, wherein the adhesive layer has a release liner on the side opposite to the heat-sensitive adhesive layer.

13. The heat seal material according to claim 7 or 8, wherein the heat-sensitive adhesive layer has a release liner on the side opposite to the adhesive layer side.

14. The heat sealing material according to claim 7 or 8, wherein the heat sealing material is in the form of a roll.

15. A method for washing fabric, comprising immersing a fabric to which a fabric label according to any one of claims 1 to 4 is attached in an alkaline solution.

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