Fabric labels, heat-sealing materials, and methods for manufacturing recycled polyester resin

Abstract

To provide a fabric label with excellent recyclability and washability, a heat-sealing material used in the fabric label, and a method for manufacturing recycled polyester resin. [Solution] A fabric label (1) comprising a base material (10) containing polyester resin, a heat-sensitive adhesive layer (20) containing polyester resin provided on one surface of the base material (10), and an adhesive layer (30) containing polyester resin laminated on the surface of the heat-sensitive adhesive layer (20) opposite to the base material (10).

Description

[Technical Field]

[0001] This disclosure relates to fabric labels, heat-sealing materials, and methods for producing recycled polyester resin. [Background technology]

[0002] Various tags are used to display information about clothing and other items. Dry cleaners attach cleaning tags to collected clothing and other items for the purpose of identification and classification. Similarly, users who regularly have their uniforms and linens dry-cleaned also attach these tags. Furthermore, material recycling of clothing has become increasingly popular in recent years. However, if different materials are used in cleaning tags or decorations, the quality of the recycled resin deteriorates.

[0003] Patent Document 1 discloses a cleaning label comprising a base material, a heat-sensitive adhesive layer laminated on one surface of the base material, and an adhesive layer laminated on the surface of the heat-sensitive adhesive layer opposite to the side on which the base material is laminated. According to the cleaning label of Patent Document 1, it has adhesive properties that allow it to be temporarily fixed to a substrate such as clothing by pressure adhesion, can be heat-adhered to the substrate after temporary fixing, and has excellent dry-cleaning resistance that makes it difficult to peel off even after dry cleaning.

[0004] Patent Document 2 discloses a textile adhesive composition mainly composed of thermoplastic polyurethane having a melting point of 80°C or lower and a urethane group concentration of 2,000 equivalents / T or higher. According to the textile adhesive composition of Patent Document 2, it has excellent adhesion to many textile materials and its adhesion does not deteriorate significantly even after dry cleaning. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-153870 [Patent Document 2] Japanese Patent Publication No. 2001-26761 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The cleaning tags mentioned above do not take into account the ease of recycling, such as melting down polyester resin-containing fabrics to obtain recycled resin. Furthermore, there is still room for improvement in terms of washability.

[0007] This disclosure was made to resolve the above-mentioned problems and aims to provide a fabric label containing polyester resin that is highly recyclable and washable, a heat-seal material used in the fabric label, and a method for producing recycled polyester resin. [Means for solving the problem]

[0008] This disclosure has the following characteristics:

[0009] [1] A label for fabric, comprising a base material containing polyester resin, a heat-sensitive adhesive layer containing polyester resin provided on one surface of the base material, and an adhesive layer containing polyester resin 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 thickness of the adhesive layer is 0.5 to 100 μm. [3] The fabric label according to [1] or [2], wherein the thickness of the heat-sensitive adhesive layer is 15 to 300 μm. [4] A fabric label according to any one of [1] to [3], having a release liner on the side of the adhesive layer opposite to the side of the heat-sensitive adhesive layer. [5] The fabric label according to any one of items [1] to [4], wherein the fabric label is in the form of a roll. [6] A fabric label as described in any one of [1] to [5], used for the manufacture of recyclable polyester resin fabrics. [7] A fabric label as described in any one of items [1] to [5], used for recycling polyester resin fabrics. [8] A heat seal material comprising a heat-sensitive adhesive layer containing a polyester resin and an adhesive layer containing a polyester resin laminated on one surface of the heat-sensitive adhesive layer. [9] The heat seal material described in [8] for heat-sensitive bonding to fabrics.

[10] The heat seal material according to [8] or [9], wherein the thickness of the adhesive layer is 0.5 to 100 μm.

[11] The heat seal material according to any one of [8] to

[10] , wherein the thickness of the heat-sensitive adhesive layer is 15 to 300 μm.

[12] The heat seal material according to any one of [8] to

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

[13] The heat seal material according to any one of [8] to

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

[14] The heat sealing material according to any one of the items [8] to

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

[15] A method for producing recycled polyester resin, comprising melting a polyester resin fabric to which a fabric label described in any one of items [1] to [3] is attached, thereby obtaining recycled polyester resin. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide a fabric label that has excellent recyclability and washability for fabrics containing polyester resin, a heat-sealing material used in the fabric label, and a method for producing recycled polyester resin. [Brief explanation of the drawing]

[0011] [Figure 1] This is a cross-sectional view of a fabric label according to one embodiment of the present disclosure. [Figure 2] This is a cross-sectional view showing a release liner for a fabric label according to an embodiment. [Figure 3] It is a cross-sectional view of a heat-sealing material according to an embodiment of the present disclosure.

Embodiments for Carrying Out the Invention

[0012] The present invention is not limited to the following examples.

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted. Also, the dimensional ratios in the drawings are exaggerated for convenience of explanation and may be different from the actual ratios.

[0014] In this specification, "X~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 (20~25°C) / relative humidity 45~55%RH.

[0015] ≪Label for Fabric≫ The label for fabric of the embodiment (hereinafter sometimes simply referred to as "label") includes a base material containing a polyester resin, a heat-sensitive adhesive layer containing a polyester resin provided on one surface of the base material, and an adhesive layer containing a polyester resin laminated on the surface of the heat-sensitive adhesive layer opposite to the base material side.

[0016] FIG. 1 is a cross-sectional view of the label for fabric according to the embodiment. As shown in FIG. 1, the label for fabric 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.

[0017] The label for fabric of the embodiment can be used by attaching it to an object that can be washed as an adherend, sticking it, and thermally bonding 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 generally refers to all materials woven from natural or synthetic fibers, but in the present invention, materials woven from synthetic fibers containing polyester resin are preferred.

[0018] In this specification, "laundry" refers to all methods of washing using water.

[0019] <Adhesive layer> The adhesive layer contains polyester resin. In the fabric label 1 of this embodiment, the label can be adhered to a fabric or the like via the adhesive layer 30. The adhesive layer may be able to adhere at room temperature or by heating, but it is preferable that it be able to adhere at room temperature. Methods of bonding using heat include heat and pressure bonding to the substrate using an iron or press (bonding by applying heat and pressure).

[0020] In the fabric label 1 of this embodiment, the label is equipped with an adhesive layer, which provides it with the ability to be temporarily attached to clothing or the like prior to heat bonding using a press or the like with a heat-sensitive adhesive layer. 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.

[0021] In the fabric label 1 of this embodiment, the adhesive layer 30 contains polyester resin, thus providing excellent compatibility with polyester-containing fabrics. Here, compatibility means that the polyester-containing fabric melts at a temperature at which it can be heated and melted, and that the molten polyester resin base material derived from the fabric mixes well with it, without degrading the properties of the recycled product.

[0022] 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.

[0023] The thickness of the adhesive layer is not particularly limited, but is preferably 0.5 to 100 μm, more preferably 0.8 to 80 μm, even more preferably 1.0 to 50 μm, and particularly preferably 1.0 to 20 μm. When the thickness of the adhesive layer is within the above range, the adhesion suitability can be further improved.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] <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.

[0028] 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.

[0029] The adhesive layer and the composition for forming the adhesive layer contain a polyester resin (hereinafter, the polyester resin contained in the adhesive layer and the composition for forming the adhesive layer may be referred to as polyester resin (A), and the polyester resin contained in the heat-sensitive adhesive layer may be referred to as polyester resin (B)).

[0030] [Polyester resin] The 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.

[0031] [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.

[0032] Among these, it is preferable to include aromatic dicarboxylic acids because they impart cohesive force.

[0033] The content of such aromatic dicarboxylic acid is preferably 50 mol% or less relative to the total polycarboxylic acid component (A1), particularly preferably 5 to 40 mol%, and even more preferably 10 to 30 mol%. If the content is too high, the glass transition temperature will rise, and sufficient adhesive performance will not be obtained.

[0034] Furthermore, in terms of imparting a tacky feel, it is preferable to include aliphatic dicarboxylic acids, and in particular, it is preferable to include aliphatic dicarboxylic acids having 4 to 12 carbon atoms.

[0035] The content of such aliphatic dicarboxylic acid is preferably 20 mol% or more, particularly preferably 50 mol% to 95 mol%, and more preferably 70 to 90 mol%, relative to the total polycarboxylic acid component (A1). If the content is too low, the glass transition temperature tends to rise and sufficient adhesive strength cannot be obtained, and if the content is too high, the amount of adhesive component decreases, which tends to reduce the adhesive strength to polar substrates.

[0036] In this disclosure, from the viewpoint of balancing adhesive properties, it is preferable to use aromatic dicarboxylic acid and aliphatic dicarboxylic acid in combination as the polycarboxylic acid component (A1), and the content ratio (molar ratio) is preferably aromatic dicarboxylic acid / aliphatic dicarboxylic acid = 1 / 99 to 90 / 10, particularly preferably aromatic dicarboxylic acid / aliphatic dicarboxylic acid = 5 / 95 to 49 / 51, and even more preferably aromatic dicarboxylic acid / aliphatic dicarboxylic acid = 10 / 90 to 30 / 70.

[0037] Furthermore, in order to increase the branching points in the polyester resin (A), trivalent or higher polycarboxylic acids can be used. Examples of such trivalent or higher polycarboxylic acids include trimellitic acid, pyromellitic acid, adamantanetricarboxylic acid, and trimesic acid. Among these, trimellitic acid is preferred because it is relatively less likely to cause gelation. The content ratio of such trivalent or higher polycarboxylic acids is preferably 10 mol% or less, and particularly preferably 0.1 to 5 mol%, relative to the total polycarboxylic acid component (A1), in order to increase the cohesive strength of the adhesive. If the content is too high, gelation tends to occur during the production of the polyester resin (A).

[0038] [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.

[0039] 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.

[0040] Furthermore, trivalent or higher polyhydric alcohols can be used in the polyester resin (A) to increase the number of branching points. Examples of trivalent or higher polyhydric alcohols include pentaerythritol, dipentaerythritol, tripentaerythritol, glycerin, trimethylolpropane, trimethylolethane, 1,3,6-hexanetriol, and adamantanetriol. The content of such trivalent or higher polyhydric alcohols is preferably 10 mol% or less, and particularly preferably 0.1 to 5 mol%, relative to the total polyol component (A2). If the content is too high, it tends to become difficult to manufacture the polyester resin (A).

[0041] 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.

[0042] The polyester resin (A) used in this disclosure is produced by arbitrarily selecting the above-mentioned polycarboxylic acid component (A1) and polyol component (A2) and carrying out a polycondensation reaction of these in the presence of a catalyst using a known method.

[0043] The number-average molecular weight of the polyester resin (A) 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, heat resistance, mechanical strength, and tackiness.

[0044] 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.

[0045] The polyester resin (A) used in this disclosure may be a commercially available product, such as LP-050S50TO (trade name, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): 10℃), SNT (trade name, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): -15℃), and NP-110S50EO (trade name, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): -50℃).

[0046] Typically, a polyester resin (A) is crosslinked using a crosslinking agent to achieve excellent cohesive strength and exhibit adhesive properties. Examples of such crosslinking agents include polyisocyanate compounds and polyepoxy compounds, which are compounds having functional groups that react with the hydroxyl groups and / or carboxyl groups contained in the polyester resin (A). Among these, polyisocyanate compounds are particularly preferred because they can achieve a good balance between initial tackiness, mechanical strength, and heat resistance.

[0047] Examples of such polyisocyanate compounds include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate, and hydrogenated xylylene diisocyanate. Also, examples include isocyanate adducts such as trimethylolpropane tolylene diisocyanate adducts, hexamethylene diisocyanate adducts, and isophorone diisocyanate adducts. Furthermore, the above polyisocyanate compounds can also be used in which the isocyanate portion is blocked by phenol, lactam, etc. These crosslinking agents may be used individually or in mixtures of two or more.

[0048] 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).

[0049] When the adhesive layer forming composition contains a crosslinking agent, the amount of such crosslinking agent can be appropriately selected depending on the molecular weight of the polyester resin (A) and the intended use. However, it is generally preferable that the amount of the crosslinking agent is such that the amount of reactive groups contained in the crosslinking agent is 0.2 to 10 equivalents per equivalent of hydroxyl groups and / or carboxyl groups contained in the polyester resin (A), particularly preferably 0.5 to 5 equivalents, and even more preferably 0.5 to 3 equivalents. If the number of equivalents of reactive groups contained in the crosslinking agent is above the lower limit, sufficient cohesive force can be obtained, and shifting after application can be suppressed. If the number of equivalents of reactive groups contained in the crosslinking agent is below the upper limit, a decrease in flexibility can be prevented, and initial tackiness can be improved, preventing peeling immediately after application.

[0050] Furthermore, after forming an adhesive layer from the adhesive layer-forming composition, the crosslinking agent reacts with the polyester resin (A) to form an intramolecular or intermolecular crosslinked structure of the polyester resin (A). From the viewpoint of improving the quality of the polyester resin (A), it is preferable that the adhesive layer does not contain any unreacted crosslinking agent.

[0051] The adhesive layer-forming composition may contain conventionally known additives such as hydrolysis inhibitors, softeners, ultraviolet absorbers, stabilizers, antistatic agents, and tackifiers, as well as other additives such as inorganic or organic fillers, metal powders, pigments, and other powders or particulate materials, to the extent that they do not impair the effects of the present disclosure.

[0052] In the adhesive layer forming composition, the content of polyester resin (A) 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 adhesive layer forming composition. When the content of polyester resin (A) is above the lower limit of the above value, adhesion to other layers can be improved.

[0053] The storage modulus of the adhesive layer 30 is preferably 1 × 10⁻¹⁶ at 23°C and a frequency of 1 Hz. 5 ~100×10 5 Pa, comfort5×10 5 ~50×10 5 The range is Pa. The storage modulus G' of the adhesive layer 30 is 100 × 10 5 If the Pa is below, the adhesive strength is more easily ensured. On the other hand, if the storage modulus G' of the adhesive layer is 1 × 10⁻⁶ 5 If the storage modulus G' is Pa or higher, cohesive force is more easily ensured. The storage modulus G' of the adhesive layer can be adjusted by appropriately changing the type, molecular weight, and blending ratio of monomers constituting the polymer (adhesive) contained in the adhesive layer, as well as the degree of polymerization of the polymer, and, if a crosslinking agent is included, the amount of crosslinking agent (crosslinking density of the polymer).

[0054] The storage modulus G' of the adhesive layer is determined using a dynamic viscoelasticity measuring instrument, ARES (manufactured by T.A. Instruments Japan Co., Ltd.). A laminate with an adhesive layer of 500 μm to 1 mm thickness (e.g., 800 μm) formed between two release liners is punched out into an 8 mm diameter disc, and the remaining material after removing the release liners is used as the adhesive layer sample. The storage modulus G'(Pa) at 23°C is recorded when measured in shear mode with a heating rate of 5°C / min and a frequency of 1 Hz in the temperature range of -50°C to 150°C.

[0055] Polyester resin can be manufactured by the method described in International Publication No. 2019 / 073944.

[0056] The glass transition temperature of the polyester resin used in the adhesive layer forming composition of this disclosure is preferably 20°C or lower, more preferably -75 to 10°C, and even more preferably -60 to 0°C. When the glass transition temperature is within the above range, the handling properties are excellent, and the adhesion between the heat-sensitive adhesive layer and the adherend is easily improved. There are no particular limitations on the method for setting the glass transition temperature within the above range, but the glass transition temperature can be adjusted by adjusting the type and ratio of monomer components used.

[0057] It is preferable that the above-mentioned polyester resin does not crystallize, that is, that it is an amorphous polyester resin, because this increases the shear adhesive strength of the adhesive layer forming composition. Furthermore, even if the polyester resin crystallizes, it is preferable that the crystallization energy be as low as possible. The crystallization energy is usually 35 J / g or less, preferably 20 J / g or less, particularly preferably 10 J / g or less, and especially preferably 5 J / g or less. When the crystallization energy is below the above upper limit, sufficient tack can be obtained, and the adhesion to the substrate can be improved.

[0058] <Heat-sensitive adhesive layer> The fabric label according to this embodiment has a heat-sensitive adhesive layer on one side of the adhesive layer. The heat-sensitive adhesive layer in the label 1 according to this embodiment contains a polyester resin. The heat-sensitive adhesive layer has heat-sensitive adhesive properties and is a layer that enables the label to be attached to an object or the like by heat-sensitive adhesion. "Heat-sensitive adhesive properties" refers to the property that the heat-sensitive adhesive layer can be attached to an object 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.

[0059] 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.

[0060] The heat-sensitive adhesive layer contains 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.

[0061] The heat-sensitive adhesive layer preferably has a melting point of 130°C or lower, more preferably 50°C to 120°C, and even more preferably 70°C to 110°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.

[0062] 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.

[0063] The thickness of the heat-sensitive adhesive layer can be set as appropriate, for example, preferably 15 to 300 μm, more preferably 30 to 200 μm, and even more preferably 40 to 150 μm. Having the thickness of the heat-sensitive adhesive layer within the above range ensures good washability.

[0064] 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.

[0065] <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.

[0066] 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.

[0067] The heat-sensitive adhesive layer and the composition for forming the heat-sensitive adhesive layer contain a polyester resin (hereinafter, the polyester resin contained in the heat-sensitive adhesive layer may also be referred to as polyester resin (B)).

[0068] The glass transition temperature of the polyester resin used in the heat-sensitive adhesive layer forming composition of this disclosure is preferably 30°C or lower, more preferably -10 to 25°C, and even more preferably 0 to 20°C. When the glass transition temperature is within the above range, the handling properties are excellent, and the adhesion between the heat-sensitive adhesive layer and the adherend is easily improved. There are no particular limitations on the method for setting the glass transition temperature within the above range, but the glass transition temperature can be adjusted by adjusting the type and ratio of monomer components used.

[0069] The glass transition temperature of the polyester resin used in the heat-sensitive adhesive layer-forming composition of this disclosure is preferably higher than the glass transition temperature of the polyester resin used in the adhesive layer-forming composition of this disclosure.

[0070] If the polyester resin is a crystalline polyester resin, the melting point of the polyester resin is preferably 80 to 200°C, more preferably 100 to 180°C, and even more preferably 130 to 150°C. When the melting point is within the above range, the polyester resin constituting the heat-sensitive adhesive layer is melted by heat after the label has been temporarily fixed to the substrate, allowing the polyester resin to easily penetrate into the gaps between the fibers of the substrate. As a result, the label becomes less likely to peel off after it has cooled and solidified and been fixed to the substrate.

[0071] The polyester resin mentioned above may be a crystalline polyester resin or an amorphous polyester resin. Using crystalline polyester resin makes it easier to select the appropriate layer for each function, and allows for separate temporary fixing and permanent fixing, enabling the label to be reapplied without damaging the substrate. Furthermore, its excellent chemical resistance means it is less likely to peel off even when washed under strong alkaline conditions such as sodium hypochlorite solution. Because amorphous polyester resin exhibits minimal dimensional changes, it is less likely to peel off even after prolonged use of the fabric. In the fabric label 1 of this embodiment, the heat-sensitive adhesive layer 20 contains polyester resin, thus providing excellent compatibility with polyester-containing fabrics.

[0072] In the composition for forming a heat-sensitive adhesive layer, the content of polyester resin (B) 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 a heat-sensitive adhesive layer. When the content of polyester resin (B) is above the lower limit of the above value, the heat-sensitive adhesion to the adherend can be improved.

[0073] The heat-sensitive adhesive layer-forming composition may contain a crosslinking agent. Examples of crosslinking agents are the same as those described for the adhesive layer-forming composition.

[0074] <Base material> The fabric label according to this embodiment has a substrate on the side of the thermal adhesive layer opposite to the adhesive layer. Examples of substrates include films, cloths, and nonwoven fabrics containing polyester resin. Examples of polyester resins include those described in relation to the adhesive layer and the composition for forming the adhesive layer.

[0075] 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.

[0076] Examples of cloths and nonwoven fabrics include those containing polyester fibers.

[0077] The type of weave of the fabric is not particularly limited; for example, satin such as polyester satin and taffeta such as polyester taffeta are examples.

[0078] 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.

[0079] 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 thickness of the base material within the above range, good washability can be achieved.

[0080] 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.

[0081] 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.

[0082] <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 for the adhesive layer (hereinafter sometimes referred to as the first adhesive layer to distinguish it from the second adhesive layer). From the viewpoint of compatibility, it is preferable that the type of polyester resin contained in the second adhesive layer is the same as the type of polyester contained in the adhesive layer 30, the heat-sensitive adhesive layer 20, the base material 10, and the fabric.

[0083] <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.

[0084] Examples of release substrates include paper substrates, laminated paper obtained by laminating a thermoplastic resin such as polyethylene onto a paper substrate, or polyester films.

[0085] 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.

[0086] Examples of paper substrates include glassine paper and high-quality paper.

[0087] Polyester-based films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) can be used.

[0088] 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 release of the release liner 40 from the polyester adhesive layer 30 during the application process.

[0089] 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.

[0090] (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.

[0091] (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, the heat-sensitive adhesive layer will adhere more easily to the substrate when heated or pressurized, thereby improving washability. If it is above the lower limit, sufficient initial adhesive strength can be obtained.

[0092] ≪Manufacturing method for 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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 the heat seal material 2, and the exposed surface of the heat-sensitive adhesive layer 20 is 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.

[0098] ≪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.

[0099] 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.

[0100] 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 at which the heat-sensitive adhesive layer is sufficiently softened. The pressure applied to the label can be 0.1 to 10 kgf / cm². 2 The degree can be illustrated with examples.

[0101] 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.

[0102] The following configuration can be given as an example of a preferred use for the fabric label of the embodiment.

[0103] 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.

[0104] 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.

[0105] Cleaning labels and quality labels are included in the fabric labels of the embodiment.

[0106] The fabric labels of this embodiment can be provided as individual sheets or as rolls. The fabric labels of this embodiment offer excellent storage stability when stored as rolls.

[0107] Uses of fabric labels The fabric labels of this embodiment can be used in the processing of fabrics made of recyclable polyester resin. For example, by attaching the label to a polyester resin fabric as described above, a recyclable polyester resin labeled fabric can be obtained. The fabric label of this embodiment is made of polyester resin, and by attaching it to a polyester resin fabric, high-quality recycled resin can be obtained when recycling the fabric without the need for sorting. This makes it easier to recycle polyester resin fabrics.

[0108] The fabric label of this embodiment can be used to recycle polyester resin fabric as recycled polyester resin. For example, a polyester resin fabric with the fabric label of the embodiment attached can be melted down and recycled as recycled polyester resin. This makes it easier to recycle polyester resin fabrics as recycled polyester resin because the fabric can be recycled with the fabric label attached without having to remove it.

[0109] Heat sealing material The heat-seal material of the embodiment comprises a heat-sensitive adhesive layer containing polyester resin and an adhesive layer containing polyester resin laminated on one surface of the heat-sensitive adhesive layer. The heat-seal material of the embodiment can be used for the fabric label 1 according to the above embodiment, and the heat-sensitive adhesive layer can also be used for bonding polyester resin hook and loop fasteners, patches, and dissimilar materials on clothing (for example, accessories such as decorations).

[0110] 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.

[0111] 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.

[0112] 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.

[0113] ≪Method for manufacturing heat-sealing 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.

[0114] For example, a thermal adhesive containing components that make up the thermal adhesive layer is heated and melted onto the release liner 401 and applied by a coating machine to obtain a laminate A in which the release liner 401 and the thermal adhesive layer 20 are laminated together.

[0115] 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.

[0116] 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 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.

[0117] 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.

[0118] ≪Method for manufacturing recycled polyester resin≫ The method for producing recycled polyester resin according to this embodiment includes melting a polyester resin fabric to which the fabric label of this embodiment has been attached to obtain recycled polyester resin. This makes it easier to prevent impurities from being mixed into the recycled polyester resin and to prevent a decrease in the physical properties of the recycled polyester resin, such as mechanical strength, transparency, and color.

[0119] The melting temperature is preferably 300°C or lower, more preferably 280°C or lower, and even more preferably 270°C or lower. The melting temperature is preferably 150°C or higher, more preferably 200°C or higher, and even more preferably 250°C or higher. When the melting temperature is within the above range, degradation due to modification of the recycled polyester resin can be prevented, and energy efficiency can be improved.

[0120] ≪Methods for recycling fabrics≫ The fabric recycling method of the embodiment is a method for recycling polyester resin fabric to which the fabric label of the embodiment has been attached, and includes melting the polyester resin fabric to which the fabric label has been attached to regenerate the polyester resin. This makes it easier to prevent impurities from being mixed into the recycled polyester resin and makes it easier to prevent a decrease in the physical properties of the recycled polyester resin, such as its mechanical strength. [Examples]

[0121] 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.

[0122] <Raw materials for manufacturing adhesive layer-forming compositions> The raw materials used in the production of the adhesive layer-forming composition in this example and comparative example are as follows.

[0123] (Polyester resin) [Polyester resin for heat-sensitive adhesive layer] GM-400 (product name, manufactured by Toyobo Co., Ltd., glass transition temperature (Tg): 19℃, melting point: 143℃). • LP-011 (product name, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): 4℃). [Polyester resin for adhesive layer] • LP-050S50TO (product name, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): 10℃). SNT (product name, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): -15℃). • NP-110S50EO (product name, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): -50℃).

[0124] <Making fabric labels> <Example 1> A crystalline polyester resin (GM-400, manufactured by Toyobo Co., Ltd.) 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°C to obtain a laminate 1 consisting of a release liner, a heat-sensitive adhesive layer, and a release liner. One of the release liners was peeled off, and a polyester resin fabric 1 (TM-750W, manufactured by Masuda Co., Ltd.) was placed on the exposed heat-sensitive adhesive layer and pressed and attached with a press machine set to 180°C to obtain a laminate 2 consisting of fabric 1, a heat-sensitive adhesive layer, and a release liner. Next, composition 1 for forming an adhesive layer was prepared by mixing 2 parts by mass of an isocyanate-based crosslinking agent (Takenate D-101E, manufactured by Mitsui Chemicals, Inc.) with 100 parts by mass of polyester resin (LP-050S50TO, manufactured by Mitsubishi Chemical Corporation, glass transition temperature (Tg): 10℃) solids. 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℃ 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, which consists of polyester resin cloth 1 / heat-sensitive adhesive layer / adhesive layer / release liner.

[0125] <Example 2> The label of Example 2 was obtained in the same manner as in Example 1, except that, as the polyester resin in the adhesive layer forming composition for forming the adhesive layer, an adhesive layer forming composition 2 containing SNT (Tg: -15℃) manufactured by Mitsubishi Chemical Corporation was used instead of LP-050S50TO manufactured by Mitsubishi Chemical Corporation.

[0126] <Examples 3-5> Labels for Examples 3 to 5 were obtained in the same manner as in Example 2, except that the thickness of the heat-sensitive adhesive layer was 70 μm (Example 3), 50 μm (Example 4), and 40 μm (Example 5).

[0127] <Examples 6 and 7> Labels for Examples 6 and 7 were obtained in the same manner as in Example 2, except that the thickness of the adhesive layer was 5 μm (Example 6) and 10 μm (Example 7).

[0128] <Example 8> The label of Example 8 was obtained in the same manner as in Example 1, except that the adhesive layer forming composition 3, which contains NP-110S50EO (Tg:-50℃) manufactured by Mitsubishi Chemical Corporation, was used as the polyester resin for forming the adhesive layer, instead of LP-050S50TO manufactured by Mitsubishi Chemical Corporation.

[0129] <Example 9> 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. A polyester cloth 1 (TM-750W, manufactured by Masuda Corporation) 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 onto the adhesive layer formed in the same manner as in Example 1 to obtain the label of Example 9.

[0130] <Examples 10-13> Labels for Examples 10 to 13 were obtained in the same manner as in Example 9, except that the thickness of the heat-sensitive adhesive layer was changed to 100 μm (Example 10), 70 μm (Example 11), 50 μm (Example 12), and 40 μm (Example 13), and adhesive layer forming composition 2 used in Example 2 was used as the adhesive layer forming composition for forming the adhesive layer.

[0131] <Examples 14, 15> Labels for Examples 14 and 15 were obtained in the same manner as in Example 9, except that the thickness of the adhesive layer was changed to 5 μm (Example 14) and 10 μm (Example 15), and adhesive layer forming composition 2 used in Example 2 was used as the adhesive layer forming composition for forming the adhesive layer.

[0132] <Example 16> The label for Example 16 was obtained in the same manner as in Example 9, except that the adhesive layer-forming composition 3 used in Example 8 was used as the adhesive layer-forming composition for forming the adhesive layer.

[0133] <Comparative Example 1> The label of Comparative Example 1 was obtained in the same manner as in Example 9, except that the adhesive layer forming composition 4 was used, which was prepared by mixing 100 parts by mass of solids of an acrylic ester copolymer (n-butyl acrylate / acrylic acid = 92 / 8) with 1 part by mass of an isocyanate crosslinking agent (Takenate D-101E manufactured by Mitsui Chemicals, Inc.) and 10 parts by mass of solids of a tackifying resin (Super Ester A-100 manufactured by Arakawa Chemical Industries, Ltd.) as the adhesive layer forming composition for forming the adhesive layer.

[0134] Table 1 shows the label configurations for the above examples and comparative examples. A "-" in the table indicates that the corresponding component is not present. Adhesives 1-4 in the table represent adhesive layer-forming compositions 1-4.

[0135] [Table 1]

[0136] [Table 2]

[0137] [Material property evaluation] The labels produced in the above examples and comparative examples were evaluated for the following physical properties.

[0138] • Recyclability We evaluated whether polyester fabrics could be recycled with the labels still attached. The evaluation criteria are as follows. A: Because all layers are made of polyester, high-quality recycled polyester resin can be obtained even when recycled while still attached to polyester fabric. F: Because it contains layers other than polyester, there are concerns that recycling it while still attached to polyester fabric may degrade the quality of the recycled polyester resin.

[0139] ·Room temperature adhesion At 23°C and 50% RH, the release liner of the label obtained in the example was peeled off, and the exposed adhesive layer was overlapped with a polyester cloth 2 (TM-750W manufactured by Masuda Co., Ltd.), and a test specimen was obtained by pasting it back and forth once with a rubber roller weighing 2 kg. Immediately after pasting, hold the polyester cloth 2 of the test specimen so that the polyester cloth 2 is on top and the label is on the bottom, and judge the normal temperature adhesiveness based on whether the label falls off. The evaluation criteria are shown below. A: The label does not fall off and has sufficient adhesiveness. F: The adhesiveness is insufficient and the label falls off.

[0140] ·Thermal pressure bonding adhesiveness Peel off the release liner of the label obtained in the example, overlap a polyester cloth 2 (TM-750W manufactured by Masuda Co., Ltd.) on the exposed heat-sensitive adhesive layer, and use a thermal pressure bonding machine (Heat Seal TP-701 manufactured by Tester Sangyo Co., Ltd.) to apply a load of 220 gf / cm 2 , heat at 180°C for 11 seconds to obtain a test piece. Immediately after preparing the test piece, perform a T-peel test by hand. The evaluation criteria are shown below. A: It is impossible to peel off. F: It is possible to peel off by hand.

[0141] ·Washability Peel off the release liner of the labels obtained in the examples and comparative examples, overlap a polyester cloth 2 (TM-750W manufactured by Masuda Co., Ltd.) on the exposed heat-sensitive adhesive layer, and use a thermal pressure bonding machine (Heat Seal TP-701 manufactured by Tester Sangyo Co., Ltd.) to apply a load of 220 gf / cm 2 , heat at 180°C for 11 seconds to obtain a test piece. The test piece was put into a cleaning solution at 60°C (prepared by adding 1 g of Ariel manufactured by Procter & Gamble Co., Ltd. to 600 mL of tap water), and the test of stirring at 500 rpm for 30 minutes was repeated (up to 50 times), and the number of times until peeling occurred was confirmed.

[0142] The physical property evaluations of the labels in the above examples and comparative examples are shown in Table 2. The "-" in the table indicates that the corresponding evaluation was not performed.

[0143] [Table 3]

[0144] [Table 4]

[0145] The label in Comparative Example 1 had poor recyclability. The labels in Examples 1-16 exhibited excellent recyclability and washability after heat bonding.

[0146] 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]

[0147] 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 fabric label comprising a base material containing polyester resin, a heat-sensitive adhesive layer containing polyester resin provided on one surface of the base material, and an adhesive layer containing polyester resin 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 thickness of the adhesive layer is 0.5 to 100 μm.

3. The fabric label according to claim 1, wherein the thickness of the heat-sensitive adhesive layer is 15 to 300 μm.

4. The fabric label according to claim 1, wherein the adhesive layer has a release liner on the side opposite to the heat-sensitive adhesive layer.

5. The fabric label according to claim 1, wherein the fabric label is in the form of a roll.

6. A fabric label according to claim 1, used for manufacturing fabrics made of recyclable polyester resin.

7. A fabric label according to claim 1, used for recycling polyester resin fabrics.

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

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

10. The heat seal material according to claim 8, wherein the thickness of the adhesive layer is 0.5 to 100 μm.

11. The heat seal material according to claim 8, wherein the thickness of the heat-sensitive adhesive layer is 15 to 300 μm.

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

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

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

15. A method for producing recycled polyester resin, comprising melting a polyester resin fabric to which a fabric label according to any one of claims 1 to 3 is attached to obtain recycled polyester resin.

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