Fabric labels, film adhesives, and methods for recycling fabrics.

Abstract

The present invention provides a fabric label that can be adhered to clothing and other fabrics, does not peel off during washing with general laundry detergents, but can be easily peeled off with the use of an alkaline agent, and can be easily separated from the fabric during the fabric recycling process; a film-like adhesive used for the fabric label and the like; and a method for recycling fabrics. [Solution] A fabric label (1) comprising a base material (10) and a film-like adhesive (20) containing an amorphous polyester resin provided on one surface of the base material (10).

Description

Technical Field

[0001] The present invention relates to a label for fabric, a film adhesive, and a method for recycling fabric.

Background Art

[0002] Clothes and the like are attached with quality display tags on which information such as washing instructions, washing symbols, sizes, handling precautions including washing or dry cleaning methods, types of materials, and fiber compositions is written. In addition, clothes are made of a combination of different materials such as fasteners and crests separately from the fabric.

[0003] In recent years, for the purpose of global environmental protection, effective utilization of resources, particularly recycling, so-called recycling, has been actively carried out. Regarding clothes, in some cases, recycling is carried out in the form of reuse as used clothes, etc., and reuse of disassembled fabrics, fibers, clothing accessories (fasteners, crests, etc.).

[0004] Patent Document 1 discloses a method for recycling specific clothes.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, at present, when recycling clothes, many of the operations for these quality display tags and sorting / separating different materials are performed manually.

[0007] The present invention was made to solve the above-mentioned problems, and aims to provide a fabric label that can be adhered to fabrics such as clothing, does not peel off the fabric when washed with general laundry detergent, but can be easily peeled off when an alkaline agent is used, and can be easily separated from the fabric in the fabric recycling process, a film-like adhesive used for the said fabric label, and a method for recycling fabrics. [Means for solving the problem]

[0008] The present invention includes the following embodiments. [1] A label for fabric, comprising a base material and a film-like adhesive containing an amorphous polyester resin provided on one surface of the base material. [2] The fabric label according to [1], wherein the glass transition temperature (Tg) of the amorphous polyester resin is 20°C or less. [3] The fabric label according to [1] or [2], wherein the thickness of the film-like adhesive is 30 μm or more. [4] The fabric label according to any one of [1] to [3], wherein the glass transition temperature (Tg) of the amorphous polyester resin is 0°C or higher and 20°C or lower. [5] The fabric label according to any one of [1] to [4], wherein the film-like adhesive is placed in a 1.5% by mass aqueous solution of sodium hypochlorite, immersed at 60°C for one day, and then the film-like adhesive is removed, and the weight loss rate when the weight change before and after immersion is measured is 5% or more. [6] A fabric label according to any one of [1] to [5], having a release liner on the side of the film-like adhesive opposite to the substrate. [7] The fabric label according to any one of items [1] to [6], wherein the fabric label is in the form of a roll. [8] A film-like adhesive containing amorphous polyester resin. [9] The film-like adhesive described in [8] for heat-sensitive bonding to fabrics.

[10] The film-like adhesive according to [8] or [9], wherein the glass transition temperature (Tg) of the amorphous polyester resin is 20°C or less.

[11] The film-like adhesive according to any one of [8] to

[10] , wherein the thickness of the film-like adhesive is 30 μm or more.

[12] The film-like adhesive according to any one of [8] to

[11] , wherein the glass transition temperature (Tg) of the amorphous polyester resin is 0°C or higher and 20°C or lower.

[13] The film-like adhesive according to any one of the items [8] to

[12] , wherein the film-like adhesive is placed in a 1.5% by mass aqueous solution of sodium hypochlorite, immersed at 60°C for one day, and then removed, and the weight loss rate when the weight change before and after immersion is measured is 5% or more.

[14] A method for recycling fabric, comprising immersing a fabric with a fabric label attached as described in any one of items [1] to [5] in an alkaline solution and peeling the fabric label off the fabric. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a fabric label that can be adhered to fabrics such as clothing, does not peel off the fabric when washed with general laundry detergent, but can be easily peeled off when an alkaline agent is used, and can be easily separated from the fabric during the fabric recycling process, a film-like adhesive used for the fabric label, and a method for recycling fabrics. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view showing 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 showing an adhesive in which a film-like adhesive according to an embodiment is sandwiched between two release liners. [Modes for carrying out the invention]

[0011] The following describes embodiments of the fabric label, film-like adhesive, and fabric recycling method of the present invention.

[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] ≪Label for Fabric≫ The label for fabric of the embodiment includes a base material and a film-like adhesive containing an amorphous polyester resin provided on one surface of the base material. Since the label for fabric of the embodiment includes a film-like adhesive containing an amorphous polyester resin, it can be adhered to fabrics such as clothing and will not peel off from the fabric during washing using general laundry detergents. However, it can be easily peeled off by using an alkaline agent and can be easily separated from the fabric in the fabric recycling process.

[0014] [[ID=1十二]]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 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.

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

[0016] The label for fabric of the embodiment (hereinafter sometimes simply referred to as "label") can be used by attaching it to an object to be washed as an adherend and thermally adhering it. The object to which the label for fabric is attached is fabric, for example, clothing such as shirts, skirts, pants, hats, mufflers, socks, bedding such as pillows and sheets, covers such as futon covers and pillow covers, carpets, curtains, towels, knee pads, shoes, bags, work clothes, etc. can be exemplified. As the attachment surface of the label, the fabric surface provided on the above object is preferable. Fabric refers to all materials woven from natural fibers or chemical fibers.

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

[0018] <Substrate> Examples of the substrate 10 of the label 1 according to the embodiment include a film, a cloth, a non-woven fabric, etc. Examples of the film include a resin film, and a synthetic resin film is preferred. Examples of the resin film 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; cellulose films, etc.

[0019] The substrate may be a film having fine pores. The film having fine pores is preferably at least one selected from the group consisting of a foamed resin film, synthetic paper having fine pores, and a resin film having fine pores. By having fine pores, the film becomes white and the visibility of washing indications and the like is enhanced.

[0020] Examples of the cloth and non-woven fabric include those containing cellulose fibers such as hemp, wool, cotton, pulp, and rayon, and fibers such as nylon, polyester, polyurethane, and vinylon.

[0021] The type of weave of the cloth is not particularly limited, and examples thereof include satin such as polyester satin, and taffeta such as polyester taffeta and cotton taffeta.

[0022] The substrate 10 may be composed of a single layer or a multi-layer. In the case of a multi-layer, each layer may be the same or different.

[0023] The thickness of the substrate 10 can be set as appropriate. For example, 15 to 300 μm is preferred, 30 to 200 μm is more preferred, and 40 to 100 μm is even more preferred. By the thickness of the substrate being within the above range, the wash resistance can be made good.

[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] <Film-type adhesive> The fabric label according to this embodiment comprises a film-like adhesive containing an amorphous polyester resin provided on one surface of the substrate. The film-like adhesive 20 in the label 1 according to this embodiment has adhesive properties. The film-like adhesive 20 may also have heat-sensitive adhesive properties. When the film-like adhesive 20 has heat-sensitive adhesive properties, the label can be attached by heat-bonding it to the substrate or the like. "Heat-sensitive adhesive properties" refers to the property that allows the film-like adhesive to be bonded to a substrate 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 film-like adhesive is heated to a temperature above its softening 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] The film-like adhesive contains an amorphous polyester resin and has adhesive properties. The film-like adhesive may exhibit adhesive properties at room temperature (23°C), for example. The heating temperature of the film-like adhesive can be appropriately determined according to the composition of the film-like adhesive, and heat-sensitive adhesion can be achieved by heating it to a temperature above the glass transition temperature (Tg) of the film-like adhesive.

[0028] The amorphous polyester resin contained in the film-like adhesive preferably has a glass transition temperature (Tg) of 90°C or less, more preferably 50°C or less, even more preferably 20°C or less, and particularly preferably 0°C or more and 20°C or less. By keeping the Tg of the polyester resin contained in the film-type adhesive below the above upper limit, the heat-sensitive adhesive strength is appropriately exhibited at practical heating temperatures, and washability is improved.

[0029] Preferably, the film-like adhesive is prepared by immersing it in a 1.5% by mass sodium hypochlorite aqueous solution at 60°C for one day, then removing the film-like adhesive and measuring the weight change before and after immersion. The weight loss rate is preferably 5% or more. This makes it easier to peel off the label when using an alkaline agent during the recycling of fabrics equipped with the aforementioned fabric labels, and allows for easier separation from the fabric during the fabric recycling process.

[0030] The film-like adhesive may consist of a single layer or multiple layers. In the case of multiple layers, each layer may be identical or different.

[0031] The thickness of the film-like adhesive can be set as appropriate, for example, 15 to 300 μm, preferably 30 μm or more, more preferably 30 to 200 μm, and even more preferably 40 to 150 μm. A film-like adhesive thickness greater than or equal to the above lower limit provides strong adhesion that prevents peeling by hand after heat-pressing.

[0032] Here, the thickness of the film-like adhesive refers to the total thickness of the film-like adhesive. For example, if the film-like adhesive consists of multiple layers, the thickness refers to the total thickness of all the layers that make up the film-like adhesive.

[0033] <Composition for forming film-like adhesives> A film-like adhesive can be formed using a film-like adhesive-forming composition containing the components that make up the film-like adhesive. The ratio of the content of each component in a film-like adhesive is usually the same as the ratio of the content of each component in a film-like adhesive-forming composition, excluding the solvent.

[0034] The film-like adhesive-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.

[0035] The film-like adhesive and the composition for forming the film-like adhesive contain an amorphous polyester resin. In the fabric label 1 of this embodiment, the film-like adhesive 20 contains amorphous polyester resin, so it can be easily peeled off using an alkaline agent and easily separated from the fabric during the fabric recycling process.

[0036] In the film-forming adhesive composition, the content of amorphous 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 film-forming adhesive composition. When the content of amorphous polyester resin is above the lower limit of the above value, the release properties when an alkaline agent is used are excellent.

[0037] [Amorphous polyester resin] The amorphous 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.

[0038] [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.

[0039] [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.

[0040] 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.

[0041] It is preferable to use three or more types of polycarboxylic acid components (A1) and polyol components (B1). In other words, the amorphous polyester resin in the present invention is preferably a copolymer containing two or more types of polycarboxylic acid components (A1) or two or more types of polyol components (B1), or both.

[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 amorphous polyester resin used in this disclosure is produced by arbitrarily selecting the above-mentioned polycarboxylic acid component (A1) and polyol component (A2) and polycondensing them in the presence of a catalyst using a known method.

[0044] The number-average molecular weight of the amorphous 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 amorphous polyester resin used in this disclosure may be a commercially available product, for example, the amorphous solvent-soluble Nichigo Polyester® TP-220 (Tg: 70℃), TP-219 (Tg: 40℃), LP-011 (Tg: 4℃), LP-022 (Tg: -15℃) manufactured by Mitsubishi Chemical Corporation, and the Byron® 200 (Tg: 67℃), GK-360 (Tg: 56℃), 600 (Tg: 47℃), GK-810 (Tg: 46℃), 630 (Tg: 7℃), GK-680 (Tg: 10℃) manufactured by Toyobo Co., Ltd.

[0047] <Adhesive layer> The fabric label according to this embodiment may have an adhesive layer between the film-like adhesive and the substrate. Having an adhesive layer can improve the adhesion between the film-like adhesive and the substrate. Furthermore, the fabric label according to the embodiment may have a second adhesive layer on the surface of the film-like adhesive opposite to the substrate side. By having a second adhesive layer, the label is given the ability to be temporarily attached to a substrate such as clothing prior to heat bonding using a press machine or the like using the film-like adhesive. This temporary attachment makes it easier to accurately adhere the label to the target location on the object to be heat-bonded.

[0048] <Removable Liner> In the label 1 according to this embodiment, the release liner 40 is provided on the side opposite to the side on which the base material 10 of the film adhesive 20 is provided. The release liner 40 may have a release base material 41 and a release agent layer 42, as shown in Figure 2.

[0049] 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.

[0050] 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.

[0051] Examples of paper substrates include glassine paper and high-quality paper.

[0052] Polyester-based films such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) can be used.

[0053] 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 adhesive 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 film-like adhesive 20 during the application process.

[0054] 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.

[0055] (Thickness of fabric labels) The thickness of the fabric label can be set as appropriate; for example, 16 to 400 μm is preferred, 35 to 300 μm is more preferred, 50 to 200 μm is even more preferred, and 70 to 120 μm is particularly preferred. When the thickness of the fabric label is within the above range, wash resistance is good.

[0056] <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 method for manufacturing the fabric label 1 of this embodiment includes providing a film-like adhesive 20 on one surface of the base material 10.

[0057] For example, a film-like adhesive forming composition containing the components constituting the film-like adhesive 20 and optionally a solvent is prepared on top of the release liner 40, and the film-like adhesive forming composition is applied to the release surface of the release liner 40 using a coating machine and dried to obtain a laminate in which the release liner 40 and the film-like adhesive 20 are laminated.

[0058] Next, the exposed surface of the film-like adhesive 20 of the laminate manufactured above is pressed against the base material 10, thereby manufacturing a label 1 in which the base material 10, the film-like adhesive 20, and the release liner 40 are laminated in this order.

[0059] <How to apply fabric labels> A method for applying a fabric label according to this disclosure includes the steps of bringing the film-like adhesive side of the fabric label according to the above embodiment into contact with a substrate, and heating the fabric label to heat-bond the film-like adhesive to the substrate.

[0060] The process may include a step of pressure-bonding a fabric label to the substrate before the step of heat-bonding a film-like adhesive to the substrate. In the process of pressure-bonding fabric labels, a film-like adhesive is brought into contact with the object to be bonded, which is an object that can be washed, and then pressed down to adhere it.

[0061] In the process of applying the film-like adhesive to the substrate, the fabric label is heated to adhere the film-like adhesive 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 film-like adhesive, and by heating to a temperature above the glass transition temperature (Tg) of the amorphous polyester resin contained in the film-like adhesive, heat-sensitive adhesion can be achieved. The pressure applied to the label can be 0.1 to 10 kgf / cm². 2 The degree can be illustrated with examples.

[0062] 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.

[0063] The following configuration can be given as an example of a preferred use for the fabric label of the embodiment.

[0064] 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.

[0065] 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.

[0066] Cleaning labels and quality labels are included in the fabric labels of the embodiment.

[0067] 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.

[0068] <Uses of fabric labels> The fabric labels of the embodiment can be used for the manufacture of recyclable fabrics. The fabric labels of the embodiment can be used for the recycling of fabrics. Specifically, the fabric labels of the embodiment can be used in a fabric recycling method in which the fabric to which the fabric label is attached is immersed in an alkaline solution and the fabric label is peeled off the fabric.

[0069] Examples of alkaline 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.

[0070] ≪Film-type adhesive≫ The film-like adhesive of the embodiment can be provided as an adhesive comprising a film-like adhesive containing an amorphous polyester resin and a release liner laminated on one surface of the film-like adhesive. The film-like adhesive of the embodiment can be used in the fabric label 1 according to the above embodiment, and the film-like adhesive can also be used for applications such as hook-and-loop fasteners, patches, and bonding of different materials in clothing. Since the film-like adhesive of this embodiment contains amorphous polyester resin, it can be used for bonding dissimilar materials in clothing, and when recycling the fabric, the dissimilar materials can be removed from the fabric by alkaline washing.

[0071] Figure 3 is a cross-sectional view showing an example of an adhesive comprising a film-like adhesive according to an embodiment, in which the film-like adhesive is sandwiched between two release liners. As shown in Figure 3, the adhesive 2 according to the embodiment comprises a release liner 401, a film-like adhesive 20, and a release liner 40 in that order. Note that the release liner 401 and the release liner 40 are peeled off when the film-like adhesive 20 is used, and are not essential components of the film-like adhesive of this disclosure.

[0072] The film-like adhesive 20 in adhesive 2 is the same as the film-like adhesive 20 in fabric label 1. The release liner 401 and release liner 40 in adhesive 2 can be the same as the release liner 40 in fabric label 1.

[0073] The film-like adhesive of the embodiment can be provided as a single sheet or as a roll. The adhesive of the embodiment exhibits excellent storage stability when stored as a roll.

[0074] <Method for manufacturing film-like adhesives> First, the method for manufacturing the label related to this disclosure will be explained below, using the method for manufacturing adhesive 2 as an example. The method for manufacturing the adhesive 2 of the embodiment includes providing a film-like adhesive 20 on one surface of the release liner 401, and providing the release liner 40 on the surface of the film-like adhesive 20 opposite to the side on which the release liner 401 is laminated.

[0075] For example, a film-like adhesive forming composition, which contains components constituting a film-like adhesive and optionally a solvent, is applied onto the release liner 401 using a coating machine and dried to obtain a laminate A in which the release liner 401 and the film-like adhesive 20 are laminated together.

[0076] Next, the release surface of the release liner 40 is pressed against the exposed surface of the film-like adhesive 20 of the laminate A manufactured above, thereby producing an adhesive 2 in which the release liner 401, the film-like adhesive 20, and the release liner 40 are laminated in this order.

[0077] ≪Methods for recycling fabrics≫ The fabric recycling method of the embodiment includes immersing the fabric to which the fabric label of the above embodiment is attached in an alkaline solution and peeling the fabric label off the fabric. Since the fabric label of the above embodiment comprises a film-like adhesive containing amorphous polyester resin, the substrate and the fabric can be easily separated by the action of the alkaline agent in the alkaline solution, making it possible to recycle the fabric. [Examples]

[0078] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[0079] <Production of film-type adhesives and fabric labels> <Example 1> An amorphous polyester solution (Nichigo Polyester® (TP-220, glass transition temperature (Tg): 70°C), manufactured by Mitsubishi Chemical Corporation, which is amorphous solvent-soluble) was applied to a release liner (glassine paper coated with silicone) to a thickness of 50 μm after drying, and dried at 90°C for 1 minute to form a film-like adhesive. Another release liner was bonded to the side of the obtained film-like adhesive opposite to the above release liner to prepare an adhesive consisting of a release liner / film-like adhesive from Example 1 / release liner.

[0080] The release liner on one side of the obtained adhesive was peeled off, and cloth 1 (Kanakin No. 3, obtained from the Japanese Standards Association) was placed on the exposed film-like adhesive. Under conditions of 23°C and 50% RH, the cloth was attached by rolling a 2 kg rubber roller back and forth once, thereby producing the fabric label of Example 1, consisting of cloth 1, the film-like adhesive of Example 1, and the release liner.

[0081] <Example 2> Except for using Nichigo Polyester® (TP-219, (Tg: 40℃)), an amorphous solvent-soluble polyester solution manufactured by Mitsubishi Chemical Corporation, an adhesive consisting of a release liner / film adhesive of Example 2 / release liner, and a fabric label of Example 2 were prepared in the same manner as in Example 1.

[0082] <Example 3> Except for using Nichigo Polyester® (LP-011 (Tg: 4℃)), an amorphous solvent-soluble polyester solution manufactured by Mitsubishi Chemical Corporation, an adhesive consisting of a release liner / film adhesive of Example 3 / release liner, and a fabric label of Example 3 were prepared in the same manner as in Example 1.

[0083] <Examples 4 and 5> The film-like adhesives and fabric labels of Examples 4 and 5 were prepared in the same manner as in Example 3, except that the film-like adhesive was applied to a thickness of 40 μm (Example 4) or 25 μm (Example 5).

[0084] <Example 6> Except for using Nichigo Polyester® (LP-022 (Tg: -15℃)), an amorphous solvent-soluble polyester solution manufactured by Mitsubishi Chemical Corporation, an adhesive consisting of a release liner / film adhesive of Example 6 / release liner, and a fabric label of Example 6 were prepared in the same manner as in Example 1.

[0085] <Reference example 1> A crystalline polyester resin (manufactured by Toyobo Co., Ltd., Byron® (GM-400 (melting point (Tm): 143℃))) was sandwiched between two release liners and heated at 180℃ using a press machine (manual hydraulic test press, IMC-18E7 model, manufactured by Imoto Seisakusho Co., Ltd.) to pressurize the crystalline polyester resin layer to a thickness of 50 μm, thereby producing the adhesive material of Reference Example 1, which consists of a release liner, a film-like adhesive made of the crystalline polyester resin layer, and a release liner.

[0086] The release liner on one side of the obtained adhesive was peeled off, and cloth 1 (Kanakin No. 3, obtained from the Japanese Standards Association) was placed on the exposed crystalline polyester resin layer. The cloth 1 and cloth 1 were bonded together by applying pressure while heating at 180°C using a press machine (manual hydraulic test press, IMC-18E7, manufactured by Imoto Seisakusho), thereby producing a fabric label for Reference Example 1 consisting of cloth 1, the film-like adhesive of Reference Example 1, and the release liner.

[0087] Table 1 shows the composition of the film-like adhesives used in the above examples and reference labels. A "-" in the table indicates that the measurement was not taken.

[0088] [Table 1]

[0089] [Material property evaluation] The labels and film-like adhesives manufactured according to the above examples and reference examples were evaluated for the following physical properties.

[0090] • Solubility in alkaline solutions The weight of the film-like adhesives obtained in the examples and reference examples was measured. Then, the film-like adhesives were placed in a 1.5% by mass sodium hypochlorite aqueous solution and immersed at 60°C for 1 day. The film-like adhesives were removed from the aqueous solution, dried at 120°C for 2 hours, and their weight was measured. The weight loss rate was determined from the change in weight before and after immersion. Solubility in alkaline solutions was evaluated according to the following criteria. A: Weight loss of 5% or more after immersion F: Weight loss after immersion is less than 5%

[0091] • Stripping test using alkaline cleaning The release liner of the fabric label obtained in the examples and reference examples was peeled off, and fabric 2 (Kanakin No. 3, obtained from the Japanese Standards Association) was placed on the exposed film-like adhesive, and a heat press 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 specimens were placed in a 1.5% by mass sodium hypochlorite aqueous solution at 60°C and stirred at 500 rpm for 30 minutes. The presence or absence of peeling was then checked. A: The film-like adhesive peels off from fabric 2. F: Does not peel off

[0092] ·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 film-like adhesive. A heat press 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 (20 mm wide, 40 mm long). A T-shaped peel test was performed by hand immediately after the specimen was prepared. The evaluation criteria are shown below. A: Not removable. F: Can be peeled off by hand.

[0093] • Washability with general laundry detergents Test specimens were prepared using the same method as in the peel test using alkaline cleaning, and placed in a 60°C cleaning solution (1 g of P&G's Ariel detergent added to 600 mL of tap water). The test involved repeatedly stirring at 500 rpm for 30 minutes (up to 50 times), and the number of times until peeling occurred was determined.

[0094] Table 2 shows the physical properties of the labels in the above examples and reference examples.

[0095] [Table 2]

[0096] The labels in Examples 1-6 were adherable to fabrics such as clothing and did not peel off during washing with general laundry detergents, but they peeled off easily with alkaline washing. Therefore, it was found that the labels and film-like adhesives in Examples 1-6 can be used in a fabric recycling method in which the fabric to which the fabric label is attached is immersed in an alkaline solution and the fabric label is peeled off the fabric. The label in Reference Example 1 had poor peelability when washed with alkaline solutions. It was found that the label and film-like adhesive in Reference Example 1 are unsuitable for fabric recycling methods using alkaline solutions.

[0097] Each configuration and combination thereof in each embodiment is merely an example, and additions, omissions, substitutions, and other modifications are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited by each embodiment, but is limited only by the scope of the claims. [Explanation of Symbols]

[0098] 1...Fabric label, 2...Adhesive, 10...Base material, 20...Film adhesive, 40, 401...Release liner, 41...Release substrate, 42...Release layer

Claims

1. A label for fabric, comprising a base material and a film-like adhesive containing an amorphous polyester resin provided on one surface of the base material.

2. The fabric label according to claim 1, wherein the glass transition temperature (Tg) of the amorphous polyester resin is 20°C or less.

3. The fabric label according to claim 1, wherein the thickness of the film-like adhesive is 30 μm or more.

4. The fabric label according to claim 1, wherein the glass transition temperature (Tg) of the amorphous polyester resin is 0°C or higher and 20°C or lower.

5. The fabric label according to claim 1, wherein the film-like adhesive is placed in a 1.5% by mass aqueous solution of sodium hypochlorite, immersed at 60°C for one day, and then the film-like adhesive is removed, and the weight loss rate when the weight change before and after immersion is measured is 5% or more.

6. A fabric label according to any one of claims 1 to 5, wherein the film-like adhesive has a release liner on the side opposite to the substrate.

7. The fabric label according to any one of claims 1 to 5, wherein the fabric label is in the form of a roll.

8. A film-like adhesive containing amorphous polyester resin.

9. A film-like adhesive according to claim 8, for heat-sensitive bonding to fabrics.

10. The film-like adhesive according to claim 8 or 9, wherein the glass transition temperature (Tg) of the amorphous polyester resin is 20°C or less.

11. The film-like adhesive according to claim 8 or 9, wherein the thickness of the film-like adhesive is 30 μm or more.

12. The film-like adhesive according to claim 8 or 9, wherein the glass transition temperature (Tg) of the amorphous polyester resin is 0°C or higher and 20°C or lower.

13. The film-like adhesive according to claim 8 or 9, wherein the film-like adhesive is placed in a 1.5% by mass aqueous solution of sodium hypochlorite, immersed at 60°C for one day, and then removed, and the weight loss rate when the weight change before and after immersion is measured is 5% or more.

14. A method for recycling fabric, comprising immersing a fabric to which a fabric label according to any one of claims 1 to 5 has been attached in an alkaline solution and peeling the fabric label off the fabric.

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