Cleaning label and method for manufacturing the same

Abstract

To provide a label for cleaning which can be thermo-sensitively bonded to an adherend such as a clothing after pressure-sensitively bonded to the adherend, and is excellent in resistance to dry cleaning.SOLUTION: A label 1 for cleaning includes a base material 10, a thermo-sensitive adhesive layer 20 laminated on one surface of the base material 10, and an adhesive layer 30 which is laminated on a surface opposite to a side where the base material 10 is laminated of the thermo-sensitive adhesive layer 20, wherein the adhesive layer 30 contains a polymer component (A), and a ratio of a content of a tackifier resin to 100 pts.mass of the polymer component (A) of the adhesive layer 30 is less than 10 pts.mass.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cleaning label and a method for manufacturing the cleaning label. [Background technology]

[0002] Various tags are used to display information about clothing and the like. 2. Description of the Related Art Dry cleaning shops attach cleaning tags to collected clothing and the like for the purpose of identifying and classifying the clothing and the like. In addition, clothing and the like are affixed with quality tags that contain information such as care instructions, washing symbols, sizes, handling precautions including washing or dry cleaning methods, material types, and fiber composition. The cleaning tag is attached using a metal pin or stapler, and the quality labeling tag is usually sewn directly onto clothing or the like.

[0003] On the other hand, Patent Document 1 discloses a cleaning tag that can be attached to clothing, etc., which is made up of a substrate / hot melt adhesive layer / adhesive layer, in which the hot melt adhesive layer is present over the entire area of ​​the label, and the adhesive layer is partially present on the surface of the hot melt adhesive layer in a position other than the edge portion of the label.

[0004] Patent Document 2 discloses a cloth-attachable tag that includes a printed layer, a thermal adhesive layer made of a hot melt adhesive provided on the back surface of the printed layer, and a temporary adhesive layer made of a detachable pressure-sensitive adhesive provided on the back surface of the thermal adhesive layer, with the temporary adhesive layer temporarily adhered to a release sheet, and the temporary adhesive layer is provided on a portion of the back surface of the thermal adhesive layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-71313 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-72892 Summary of the Invention [Problem to be solved by the invention]

[0006] The cleaning tags listed above are provided with an adhesive layer (adhesive layer in Patent Document 1, temporary adhesive layer in Patent Document 2) that can pressure-sensitively adhere the cleaning tag to an adherend such as clothing to temporarily secure it, and this tends to interfere with the heat-sensitive adhesion of the heat-sensitive adhesive layer (hot-melt adhesive layer in Patent Document 1, thermal adhesive layer in Patent Document 2). For this reason, in Patent Documents 1 and 2, the adhesive layer is provided partially on the heat-sensitive adhesive layer to strengthen the heat-sensitive adhesive force and improve cleaning resistance. However, there is still room for improvement in cleaning resistance.

[0007] The present invention has been made to solve the above-mentioned problems, and has an object to provide a cleaning label that has adhesive suitability that allows it to be temporarily attached by pressure-sensitive adhesion to an adherend such as clothing, and that can be heat-sensitively adhered to the adherend after being temporarily attached, and that has excellent dry-cleaning resistance that makes it difficult to peel off even after dry-cleaning. [Means for solving the problem]

[0008] Conventionally, adhesive layers used to temporarily attach labels to rough surfaces such as clothing generally contain a tackifying resin to enhance adhesive strength. However, the inventors have unexpectedly found through their research that reducing the content of the tackifying resin in the adhesive layer can improve the cleaning resistance exhibited by the heat-sensitive adhesive of the heat-sensitive adhesive layer, leading to the completion of the present invention. That is, the present invention has the following aspects.

[0009] (1) a substrate; a heat-sensitive adhesive layer laminated on one surface of the substrate; a pressure-sensitive adhesive layer laminated on a surface of the heat-sensitive adhesive layer opposite to the surface on which the base material is laminated; Equipped with the pressure-sensitive adhesive layer contains a polymer component (A), A cleaning label, wherein the content of a tackifier resin in the pressure-sensitive adhesive layer is less than 10 parts by mass relative to 100 parts by mass of the polymer component (A). (2) The cleaning label according to (1), wherein the tackifier resin is at least one tackifier resin selected from the group consisting of petroleum resin-based tackifier resins, styrene-based tackifier resins, terpene-based tackifier resins, and rosin-based tackifier resins. (3) The cleaning label according to (1) or (2) above, wherein the glass transition temperature (Tg) of the polymer component (A) is −40° C. or lower. (4) The cleaning label according to any one of (1) to (3) above, wherein the polymer component (A) contains an acrylic polymer. (5) The cleaning label according to (4) above, wherein the content of structural units derived from 2-ethylhexyl acrylate is 50% by mass or more relative to 100% by mass of the polymer component (A). (6) The cleaning label according to any one of (1) to (5) above, wherein the thickness of the adhesive layer is 15 μm or less. (7) The cleaning label according to any one of (1) to (6) above, wherein the melting point of the heat-sensitive adhesive layer is 130° C. or lower. (8) The heat-sensitive adhesive layer contains a polymer component (B), The cleaning label according to any one of (1) to (7), wherein the polymer component (A) contained in the pressure-sensitive adhesive layer and the polymer component (B) contained in the heat-sensitive adhesive layer are crosslinked via a crosslinking agent. (9) The cleaning label according to any one of (1) to (8), wherein the substrate is at least one selected from the group consisting of a foamed resin film, a synthetic paper having micropores, and a resin film having micropores. (10) providing a heat-sensitive adhesive layer on one side of the substrate; providing a pressure-sensitive adhesive layer on the surface of the heat-sensitive adhesive layer opposite to the surface on which the substrate is laminated; the pressure-sensitive adhesive layer contains a polymer component (A), The method for producing a cleaning label according to any one of (1) to (9), wherein the content of the tackifier resin in the adhesive layer is 10 parts by mass or less relative to 100 parts by mass of the polymer component. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a cleaning label that is suitable for temporary attachment by pressure-sensitive adhesion to an adherend such as clothing, can be heat-sensitively adhered to the adherend after temporary attachment, and has excellent resistance to dry cleaning. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view of a cleaning label according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the cleaning label and the method for producing the cleaning label of the present invention will be described.

[0013] <Cleaning label> A cleaning label (hereinafter, sometimes simply referred to as "label") according to an embodiment includes a substrate, a heat-sensitive adhesive layer laminated on one surface of the substrate, and a pressure-sensitive adhesive layer laminated on the surface of the heat-sensitive adhesive layer opposite to the substrate, The pressure-sensitive adhesive layer contains a polymer component (A), and the content of a tackifier resin relative to 100 parts by mass of the polymer component (A) in the pressure-sensitive adhesive layer is 10 parts by mass or less.

[0014] Fig. 1 is a cross-sectional view of a cleaning label 1 according to an embodiment. As shown in Fig. 1, the label 1 according to this embodiment comprises a substrate 10, a heat-sensitive adhesive layer 20 laminated on one side of the substrate 10, and a pressure-sensitive adhesive layer 30 laminated on the side of the heat-sensitive adhesive layer 20 opposite to the side on which the substrate 10 is laminated. The release liner 40 is peeled off when the label is used, and is not an essential component of the label of the present invention.

[0015] <Base material> Examples of the substrate 10 of the label 1 according to the embodiment include film, cloth, and nonwoven fabric. The film may be a resin film, preferably a synthetic resin film, such as a polyester film (e.g., polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate), a polyolefin film (e.g., polyethylene or polypropylene), a polyamide film (e.g., nylon), a polyurethane film, a polystyrene film, a polylactic acid film, or a cellulose film.

[0016] The substrate may be a film having micropores. The film having micropores is preferably at least one selected from the group consisting of foamed resin film, synthetic paper having micropores, and resin film having micropores. The presence of micropores makes the film white, improving the visibility of washing instructions and the like.

[0017] The foamed resin film is a porous resin film, and examples thereof include a film obtained by extrusion foaming of a resin, a film obtained by molding a resin composition in which a gas is dispersed, etc. Examples of foamed resin films include a foamed polyester film, a foamed polyethylene terephthalate film, a foamed polypropylene film, a foamed polyethylene film, and a foamed polystyrene film.

[0018] The resin film having micropores is a porous resin film produced using a synthetic resin as a main raw material. Examples of the resin in the resin film having micropores include the same resins as those used in the foamed resin film.

[0019] Synthetic paper with micropores is a porous film with properties similar to those of paper made primarily from synthetic resin. Examples of synthetic resins used as the primary raw material for synthetic paper include polypropylene, polyester, and polystyrene, with polyethylene terephthalate being an example of polyester. Here, the primary raw material refers to a raw material that accounts for 50% or more by mass of the total raw materials used for synthetic paper. Examples of micropores in synthetic paper include micropores generated during the stretching process. For example, when a synthetic resin containing a filler is stretched, microvoids are formed around the filler, imparting a white, paper-like texture. Specific examples of synthetic paper with micropores include Yupo (registered trademark) (containing polypropylene, Yupo Corporation), Crisper (registered trademark) (containing polyester, Toyobo Co., Ltd.), and N-Coat (registered trademark) (containing polypropylene, Nakamoto Pax Co., Ltd.). Products with properties equivalent to these are also included in the category of synthetic paper with micropores. The substrate may be transparent or opaque, but is preferably opaque so that the information printed on the label can be easily identified. The film having micropores is also opaque, making it suitable as a substrate for labels.

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

[0021] The type of weave of the fabric 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 made up of a single layer or multiple layers, in which case each layer may be the same or different.

[0023] The thickness of the substrate 10 can be set appropriately and is, for example, preferably 15 to 300 μm, more preferably 30 to 200 μm, and even more preferably 40 to 100 μm. When the thickness of the substrate is within the above range, good dry cleaning resistance can be achieved.

[0024] In this specification, "thickness" refers to a value expressed as the average of thickness measurements at five randomly selected points, which can be obtained using a constant pressure thickness measuring device in accordance with JIS K7130.

[0025] Here, the thickness of the substrate means the thickness of the entire substrate, and for example, when the substrate is made up of multiple layers, the thickness means the total thickness of all layers constituting the substrate.

[0026] <Adhesive layer> The adhesive layer 30 in the label 1 according to this embodiment has pressure-sensitive adhesive properties, allowing the label to be attached to an adherend such as clothing by pressure-sensitively adhering to the adherend. "Pressure-sensitive adhesive" refers to the property of being able to adhere to an adherend by applying pressure to the adhesive layer. Note that the terms "pressure-sensitive adhesion" and "adhesion" have the same meaning. The label has an adhesive layer, which allows it to be temporarily attached to clothing, etc., prior to subsequent heat-sensitive bonding using a press or the like, utilizing the heat-sensitive adhesive layer. The ability to temporarily attach makes it easy to accurately attach the label to the desired position on the object to which it is to be heat-bonded.

[0027] The composition of the adhesive layer is not particularly limited and can be made of a known adhesive. The adhesive layer in the label according to the embodiment contains a polymer component (A), and the content of the tackifier resin is 10 parts by mass or less per 100 parts by mass of the polymer component (A) in the adhesive layer. The polymer component is a component that can be considered to be formed by a polymerization reaction of a polymerizable compound. The content of the polymer component (A) relative to the total mass of the pressure-sensitive adhesive layer may be 50 to 100 mass %, 60 to 100 mass %, or 70 to 100 mass %. The tackifying resin and polymer component will be described below.

[0028] Tackifying resin In this specification, the term "tackifier resin" refers to a resin that has the function of improving the adhesive performance of a pressure-sensitive adhesive layer when added to the pressure-sensitive adhesive layer. Tackifier resins are also called tackifiers.

[0029] The tackifier resin may be a polymer. The weight-average molecular weight of the tackifier resin may be, for example, 5,000 or less, 100 to 5,000, 200 to 3,000, or 300 to 1,000. The weight-average molecular weight may be a polystyrene-equivalent value measured by gel permeation chromatography (GPC).

[0030] In the pressure-sensitive adhesive layer according to the embodiment, the proportion of the tackifier resin content relative to 100 parts by mass of the polymer component (A) is less than 10 parts by mass, preferably 4 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 1 part by mass or less, and it is particularly preferred that the pressure-sensitive adhesive layer is substantially free of tackifier resin. From a similar viewpoint, the adhesive layer according to the embodiment may have a tackifying resin content of less than 9% by mass, 4% by mass or less, 3% by mass or less, or 1% by mass or less relative to the total mass of the adhesive layer, and it is particularly preferred that the adhesive layer is substantially free of tackifying resin. By setting the content of the tackifier resin to the above upper limit or less, it is possible to improve the cleaning resistance of the label.

[0031] Conventionally, when a label is to be pressure-sensitively adhered to an object having a rough surface such as clothing, a tackifying resin is generally added to the adhesive layer. However, the inventors have clarified that the inclusion of a tackifier resin in the PSA layer in excess of the above upper limit is a factor in reducing dry-cleaning resistance. By ensuring that the ratio of the tackifier resin content in the PSA layer to 100 parts by mass of polymer component (A) is less than or equal to the above upper limit, a label with excellent dry-cleaning resistance can be provided.

[0032] Here, "dry cleaning resistance" refers to the property of a label that, after pressure-sensitive and heat-sensitive adhesion to an adherend, does not or is unlikely to peel off from the adherend due to dry cleaning (for example, in the dry cleaning test using perchloroethylene described below).

[0033] Considering that dry cleaning resistance is mainly achieved by the heat-sensitive adhesion of the heat-sensitive adhesive layer, the fact that the content of the tackifying resin in the adhesive layer affects dry cleaning resistance is a result that exceeds normal expectations. The reason why reducing the content of tackifier resin in the adhesive layer can improve cleaning resistance is not clear, but if the content of tackifier resin in the adhesive layer exceeds the above upper limit, it is thought that the tackifier resin may dissolve in the solvent used in dry cleaning, or the solvent may penetrate into the label in the adhesive layer, causing the adhesive layer to swell, which may result in peeling of the label during dry cleaning.

[0034] The tackifying resin is not particularly limited, and examples thereof include petroleum resin-based tackifying resins: rosin-based tackifying resins such as rosin and rosin derivatives; terpene-based tackifying resins such as terpene resins, hydrogenated terpene resins, terpene phenol resins, and aromatic-modified terpene resins; and other tackifying resins that can be used as tackifying resins, such as liquid resins, resin emulsions, alkylphenol resins, phenolic resins, vinyl acetate resins, and styrene resins.

[0035] The tackifying resin may be at least one type of tackifying resin selected from the group consisting of petroleum resin-based tackifying resins, styrene-based tackifying resins, terpene-based tackifying resins, and rosin-based tackifying resins.

[0036] Petroleum resins are resins derived from petroleum components, and examples thereof include fractions such as C5 fractions and C9 fractions obtained by cracking naphtha, and polymers thereof (e.g., C5-C9 petroleum resins). Petroleum resin-based tackifying resins can have structural units derived from, for example, indene, styrene, vinyltoluene, isoprene, piperylene, cyclopentadiene, dicyclopentadiene, etc. Examples of petroleum resin-based tackifying resins include hydrogenated petroleum resins, aliphatic petroleum resins, aromatic petroleum resins, and dicyclopentadiene petroleum resins.

[0037] In this embodiment, "rosin" is a general term for rosin resins and rosin derivatives. Such rosins include unmodified rosins such as tall rosin, gum rosin, and wood rosin, which contain resin acids such as abietic acid, neoabietic acid, palustric acid, pimaric acid, isopimaric acid, and dehydroabietic acid as their main components, as well as disproportionated rosin, polymerized rosin, hydrogenated rosin, rosin ester, rosin-containing diol, and other chemically modified rosins. Furthermore, "acid-modified" refers to the addition of carboxyl groups to rosin, and specific examples of acid-modified rosins include those obtained by reacting rosin with an α,β-unsaturated carboxylic acid such as (meth)acrylic acid, maleic acid (anhydride), fumaric acid, itaconic acid, or citraconic acid (anhydride).

[0038] The rosin ester can be, for example, an ester of at least one of rosin and rosin derivatives with an alcohol, such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylene glycol, glycerin, pentaerythritol, or dipentaerythritol.

[0039] Examples of the terpene resin include those obtained by polymerizing a terpene monomer. Examples of the hydrogenated terpene resin include those obtained by hydrogenating a terpene resin. Examples of the terpene phenol resin include those obtained by copolymerizing a terpene monomer and a phenol. Examples of the aromatic terpene resin include those obtained by modifying a terpene resin with an aromatic monomer.

[0040] These tackifying resins may be used alone or in combination of two or more.

[0041] Polymer component Examples of the polymer component (A) include known adhesive resins, such as acrylic resins, urethane resins, rubber resins, silicone resins, epoxy resins, polyvinyl ethers, polycarbonates, and ester resins, with acrylic resins being preferred.

[0042] The acrylic resin may be, for example, an acrylic polymer having at least a structural unit derived from a (meth)acrylic acid alkyl ester, and it is preferable that the polymer component (A) contains an acrylic polymer. The proportion of the acrylic polymer content relative to the total mass of the heat-sensitive adhesive layer may be 50 to 100 mass %, 60 to 100 mass %, or 70 to 100 mass %. The acrylic polymer may have one type of structural unit or two or more types, and when there are two or more types, the combination and ratio thereof can be selected arbitrarily.

[0043] In this specification, the term "(meth)acrylic acid" is a concept that encompasses both "acrylic acid" and "methacrylic acid." The same applies to terms similar to (meth)acrylic acid.

[0044] The (meth)acrylic acid alkyl ester may be, for example, one in which the alkyl group constituting the alkyl ester has 1 to 20 carbon atoms, and the alkyl group is preferably linear or branched. More specifically, the (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, n-octyl (meth)acrylate, n-butyl (meth)acrylate, -nonyl, isononyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate (lauryl (meth)acrylate), tridecyl (meth)acrylate, tetradecyl (meth)acrylate (myristyl (meth)acrylate), pentadecyl (meth)acrylate, hexadecyl (meth)acrylate (palmityl (meth)acrylate), heptadecyl (meth)acrylate, octadecyl (meth)acrylate (stearyl (meth)acrylate), nonadecyl (meth)acrylate, and eicosyl (meth)acrylate.

[0045] From the viewpoint of improving the adhesive strength of the pressure-sensitive adhesive layer, the acrylic polymer preferably has a structural unit derived from a (meth)acrylic acid alkyl ester in which the alkyl group has 4 or more carbon atoms. From the viewpoint of further improving the adhesive strength of the pressure-sensitive adhesive layer, the alkyl group preferably has 4 to 12 carbon atoms, more preferably 4 to 8. Furthermore, the (meth)acrylic acid alkyl ester in which the alkyl group has 4 or more carbon atoms is preferably an acrylic acid alkyl ester.

[0046] The acrylic polymer preferably further contains a structural unit derived from a functional group-containing monomer in addition to the structural unit derived from the (meth)acrylic acid alkyl ester. The functional group-containing monomer serves as a starting point for crosslinking when the functional group reacts with a crosslinking agent described below, for example.

[0047] Examples of the functional group in the functional group-containing monomer include a hydroxyl group, a carboxyl group, an amino group, and an epoxy group. That is, examples of functional group-containing monomers include hydroxyl group-containing monomers, carboxyl group-containing monomers, amino group-containing monomers, and epoxy group-containing monomers.

[0048] Examples of the hydroxyl group-containing monomer include hydroxyalkyl (meth)acrylates such as hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate; and non-(meth)acrylic unsaturated alcohols (unsaturated alcohols not having a (meth)acryloyl skeleton) such as vinyl alcohol and allyl alcohol.

[0049] Examples of the carboxy group-containing monomer include ethylenically unsaturated monocarboxylic acids (monocarboxylic acids having an ethylenically unsaturated bond) such as (meth)acrylic acid and crotonic acid; ethylenically unsaturated dicarboxylic acids (dicarboxylic acids having an ethylenically unsaturated bond) such as fumaric acid, itaconic acid, maleic acid and citraconic acid; anhydrides of the ethylenically unsaturated dicarboxylic acids; and (meth)acrylic acid carboxyalkyl esters such as 2-carboxyethyl methacrylate.

[0050] The functional group-containing monomer is preferably a carboxy group-containing monomer.

[0051] The functional group-containing monomer constituting the acrylic polymer may be one type only, or two or more types, and when two or more types are used, the combination and ratio thereof can be selected arbitrarily.

[0052] In the acrylic polymer, the content of the structural units derived from functional group-containing monomers is preferably 1 to 35 mass %, more preferably 2 to 32 mass %, and particularly preferably 3 to 30 mass %, relative to the total amount of structural units.

[0053] The acrylic polymer may further contain structural units derived from other monomers in addition to the structural units derived from the (meth)acrylic acid alkyl ester and the structural units derived from the functional group-containing monomer. The other monomer is not particularly limited as long as it is copolymerizable with the (meth)acrylic acid alkyl ester or the like. Examples of the other monomers include styrene, α-methylstyrene, vinyltoluene, vinyl formate, vinyl acetate, acrylonitrile, and acrylamide.

[0054] The other monomers constituting the acrylic polymer may be one type only or two or more types, and when two or more types are used, the combination and ratio thereof can be selected arbitrarily.

[0055] The glass transition temperature (Tg) of the polymer component (A) is preferably −40° C. or lower, more preferably −70° C. or higher to −40° C. or lower, and even more preferably −60° C. or higher to −55° C. When the Tg of the polymer component (A) is the above upper limit or lower, the adhesive strength to the adherend is improved. Instead of increasing the content of the tackifier resin in the pressure-sensitive adhesive layer, the pressure-sensitive adhesive property of the pressure-sensitive adhesive layer can be increased by lowering the glass transition temperature (Tg) of the polymer component (A).

[0056] The glass transition temperature (Tg) of the polymer component (A) can be calculated using the Fox formula shown below. 1 / Tg=(W1 / Tg1)+(W2 / Tg2)+...+(Wm / Tgm) (where Tg is the glass transition temperature of the polymer component, Tg1, Tg2,...Tgm are the glass transition temperatures of the homopolymers of the monomers that make up the polymer, and W1, W2,...Wm are the mass fractions of the monomers, where W1+W2+...+Wm=1.) The glass transition temperatures of the homopolymers of each monomer in the Fox formula can be found in the Polymer Data Handbook, Adhesive Handbook, or Polymer Handbook. For example, the Tg of the homopolymer of methyl acrylate is 10°C, the Tg of the homopolymer of 2-hydroxyethyl acrylate is -15°C, the Tg of the homopolymer of 2-ethylhexyl acrylate is -70°C, and the Tg of the homopolymer of 2-ethylhexyl methacrylate is -10°C.

[0057] The content of structural units derived from 2-ethylhexyl acrylate relative to 100% by mass of the polymer component (A) is preferably 50% by mass or more, more preferably 50 to 70% by mass, and even more preferably 55 to 65% by mass. As described above, since 2-ethylhexyl acrylate has a low Tg, by ensuring that the content of structural units derived from 2-ethylhexyl acrylate in the polymer component (A) is equal to or greater than the lower limit, the pressure-sensitive adhesive property of the pressure-sensitive adhesive layer can be effectively improved.

[0058] The pressure-sensitive adhesive layer can be formed using a pressure-sensitive adhesive composition containing components that constitute the pressure-sensitive adhesive layer. The pressure-sensitive adhesive composition preferably further contains a crosslinking agent in addition to the polymer component (A).

[0059] Examples of crosslinking agents include isocyanate-based crosslinking agents (crosslinking agents having an isocyanate group) such as tolylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, and adducts of these diisocyanates; epoxy-based crosslinking agents (crosslinking agents having a glycidyl group) such as ethylene glycol glycidyl ether; aziridine-based crosslinking agents (crosslinking agents having an aziridinyl group) such as hexa[1-(2-methyl)-aziridinyl]triphosphatriazine; metal chelate-based crosslinking agents (crosslinking agents having a metal chelate structure) such as aluminum chelate; and isocyanurate-based crosslinking agents (crosslinking agents having an isocyanuric acid skeleton). In addition, melamine-based compounds, hydrazide-based compounds, oxazoline-based compounds, carbodiimide-based compounds, urea-based compounds, dialdehyde-based compounds, metal alkoxides, metal salts, and the like can also be used.

[0060] Examples of aluminum chelate compounds include diisopropoxyaluminum monooleyl acetoacetate, monoisopropoxyaluminum bisoleyl acetoacetate, monoisopropoxyaluminum monooleate monoethyl acetoacetate, diisopropoxyaluminum monolauryl acetoacetate, diisopropoxyaluminum monostearyl acetoacetate, diisopropoxyaluminum monoisostearyl acetoacetate, monoisopropoxyaluminum mono-N-lauroyl-β-alanate monolauryl acetoacetate, aluminum trisacetylacetonate, monoacetylacetonate aluminum bis(isobutylacetoacetate) chelate, monoacetylacetonate aluminum bis(2-ethylhexylacetoacetate) chelate, monoacetylacetonate aluminum bis(dodecylacetoacetate) chelate, and monoacetylacetonate aluminum bis(oleylacetoacetate) chelate.

[0061] The pressure-sensitive adhesive composition may contain only one type of crosslinking agent, or two or more types. When two or more types are contained, the combination and ratio thereof can be selected arbitrarily.

[0062] The content of the crosslinking agent in the pressure-sensitive adhesive composition is preferably 0.1 parts by mass or more and 10 parts by mass or less, more preferably 0.5 parts by mass or more and 5 parts by mass or less, and even more preferably 0.8 parts by mass or more and 3 parts by mass or less, relative to 100 parts by mass of the content of the polymer compound (A).

[0063] When the pressure-sensitive adhesive composition contains a crosslinking agent, the dry cleaning resistance of the label can be improved. The crosslinking agent can, for example, crosslink polymer components (A) contained in the pressure-sensitive adhesive layer to each other, thereby strengthening the pressure-sensitive adhesive layer and improving dry cleaning resistance, or crosslink polymer component (A) contained in the pressure-sensitive adhesive layer with polymer component (B) contained in the heat-sensitive adhesive layer described below, thereby strengthening the bond at the interface between the pressure-sensitive adhesive layer and the heat-sensitive adhesive layer and improving dry cleaning resistance.

[0064] The crosslinking agent according to this embodiment may be one that does not form a crosslinked structure with the tackifier resin.

[0065] In the label 1 of this embodiment, a pressure-sensitive adhesive layer 30 is provided between the heat-sensitive adhesive layer 20 and the adherend. In Patent Documents 1 and 2, a layer corresponding to the pressure-sensitive adhesive layer is provided on part of the surface of the layer corresponding to the heat-sensitive adhesive layer in order to prevent the layer from interfering with heat-sensitive adhesion. In contrast, the label of the embodiment has improved cleaning resistance of the heat-sensitive adhesive layer by reducing the content of tackifying resin in the adhesive layer, so it is not necessarily required to have an adhesive layer only on a portion of the heat-sensitive adhesive layer.

[0066] In the embodiment of the label 1, the pressure-sensitive adhesive layer 30 is preferably provided over 70 to 100 area % of the surface of the heat-sensitive adhesive layer 20 (100 area %), more preferably over 90 to 100 area %, and even more preferably over the entire surface (100 area %). By providing the pressure-sensitive adhesive layer 30 with an area percentage equal to or greater than the lower limit, the thickness of the label is made uniform, adhesion to the adherend is improved, and dry cleaning resistance can be improved.

[0067] The adhesive layer may consist of one layer (single layer), or may consist of two or more layers. When it consists of multiple layers, these multiple layers may be the same or different from each other, and the combination of these multiple layers is not particularly limited.

[0068] The thickness of the pressure-sensitive adhesive layer is not particularly limited, but is preferably 16 μm or less, more preferably 15 μm or less, even more preferably 1 to 13 μm, and particularly preferably 5 to 11 μm. In order to improve the pressure-sensitive adhesive strength, it is common to increase the thickness of the adhesive layer, but in the use of the label of the embodiment, it is sufficient to exert adhesive strength sufficient to enable temporary attachment to the object to which it is attached. Furthermore, by keeping the thickness of the adhesive layer at or below the above upper limit, it is unlikely to interfere with the adhesion between the heat-sensitive adhesive layer and the object to which it is attached, such as clothing.

[0069] Here, the thickness of the adhesive layer means the thickness of the entire adhesive layer, and for example, the thickness of an adhesive layer consisting of multiple layers means the total thickness of all layers that make up the adhesive layer.

[0070] From the above viewpoints, the adhesive strength of the adhesive layer is preferably 0.5 to 30 N / 25 mm, more preferably 2 to 20 N / 25 mm, and even more preferably 3 to 15 N / 25 mm, in terms of T-type peel strength with cotton fabric, measured in accordance with JIS K6854-3 at a peel rate of 300 mm / min. Note that the adhesive strength here refers to the adhesive strength of the adhesive layer before the label is heat-sensitively bonded (of the label that is not heat-sensitively bonded). If the adhesive strength of the adhesive layer is equal to or greater than the above lower limit, it is suitable for temporary attachment to an object to be attached, and if it is equal to or less than the above upper limit, it is preferable because it is easy to remove again.

[0071] <Heat-sensitive adhesive layer> The heat-sensitive adhesive layer 20 in the label 1 according to this embodiment has heat-sensitive adhesive properties, and is a layer that enables the label to be attached by heat-sensitively adhering it to an adherend such as clothing. "Heat-sensitive adhesive properties" refer to the property that allows the heat-sensitive adhesive layer to be heated, melted, and then hardened again, thereby adhering it to an adherend. Examples of heat-sensitive adhesion include heat and pressure adhesion (adhesion by application of heat and pressure) to the adherend using an iron, a press, or the like. The label is adhered to the substrate by heating the heat-sensitive adhesive layer to a temperature above its melting point and then cooling it. The use of heat-sensitive adhesion ensures strong adhesion to the substrate, resulting in a label with excellent dry-cleaning resistance.

[0072] In the label 1 of the embodiment, an adhesive layer 30 is provided between the heat-sensitive adhesive layer 20 and the adherend, and it is thought that heating or pressurizing the label causes deformation of the adhesive layer 30, exposing the heat-sensitive adhesive layer 20 and allowing it to adhere to the adherend.

[0073] The composition of the heat-sensitive adhesive layer is not particularly limited as long as it 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 depending on the composition of the heat-sensitive adhesive layer, and heat-sensitive adhesion can be exhibited by heating the heat-sensitive adhesive layer to a temperature equal to or higher than the melting point of the heat-sensitive adhesive layer.

[0074] The heat-sensitive adhesive layer preferably contains a polymer component (B). Examples of the polymer component (B) include thermoplastic resins having adhesive properties, such as polyolefin resins and polyester resins. Examples of polyolefin resins include polyethylene (low density polyethylene, medium density polyethylene, high density polyethylene, etc.), polypropylene, polybutene, polyisobutylene, polybutadiene, polyisoprene, etc. The heat-sensitive adhesive layer may also contain olefin copolymers such as ethylene-α-olefin copolymers and ethylene-propylene copolymers; acrylic polymers such as ethylene-acrylic acid copolymers, ethylene-methacrylic acid copolymers, ethylene-acrylic acid ester copolymers and ethylene-methacrylic acid ester copolymers; vinyl acetate polymers such as ethylene-vinyl acetate copolymer (EVA); or ionomer resins or acid-modified polyolefins obtained by modifying these with acids.

[0075] The polymer component (B) may have a functional group capable of bonding to other compounds, such as a vinyl group, a (meth)acryloyl group, an amino group, a hydroxyl group, or a carboxyl group. For example, the polymer component (B) having the functional group may be crosslinked with the polymer component (B) through a crosslinking agent. adhesive The crosslinking agent may be crosslinked with the polymer component (A) contained in the pressure-sensitive adhesive layer. Examples of the crosslinking agent include those exemplified for the pressure-sensitive adhesive layer, and the crosslinking agent is preferably a crosslinking agent that reacts with and bonds to the polymer component (A) contained in the pressure-sensitive adhesive layer and the polymer component (B) contained in the heat-sensitive adhesive layer. By crosslinking the polymer component (A) contained in the pressure-sensitive adhesive layer with the polymer component (B) contained in the heat-sensitive adhesive layer described below, the adhesion at the interface between the pressure-sensitive adhesive layer and the heat-sensitive adhesive layer becomes stronger, thereby improving dry cleaning resistance.

[0076] The heat-sensitive adhesive layer preferably has a melting point of 130°C or lower, more preferably 50°C or higher and 120°C or lower, and even more preferably 70°C or higher and 110°C or lower. When the melting point of the heat-sensitive adhesive layer is equal to or lower than the upper limit, the heat-sensitive adhesive strength is appropriately exhibited at practical heating temperatures, and the dry cleaning resistance is improved.

[0077] The heat-sensitive adhesive layer may be a single layer or multiple layers, and in the case of multiple layers, each layer may be the same or different.

[0078] The thickness of the heat-sensitive adhesive layer can be appropriately set, and is, for example, preferably 15 to 300 μm, more preferably 30 to 200 μm, and even more preferably 40 to 100 μm. When the thickness of the heat-sensitive adhesive layer is in the above range, good dry cleaning resistance is achieved.

[0079] Here, the thickness of the heat-sensitive adhesive layer means the thickness of the entire heat-sensitive adhesive layer; for example, when the heat-sensitive adhesive layer consists of multiple layers, the thickness means the total thickness of all layers that make up the heat-sensitive adhesive layer.

[0080] <Release liner> The release liner 40 is provided on the surface of the pressure-sensitive adhesive layer 30 opposite to the side on which the heat-sensitive adhesive layer 20 is provided.

[0081] There are no particular limitations on the release liner 40, and in general, any known release liner having a release treatment applied to one side of the sheet can be appropriately selected and used. Examples of liners that can be used for the release liner 40 include paper such as glassine paper, fine paper, and kraft paper, laminated paper obtained by laminating such paper with a thermoplastic resin such as polyethylene, polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, and polyolefin films such as polyethylene and polypropylene.

[0082] Examples of release treatment agents for performing the release treatment include silicone, long-chain alkyl resins, and fluorine-based resins. The thickness of the release liner 40 is not particularly limited, but is preferably 10 to 150 μm, and more preferably 20 to 130 μm.

[0083] The total thickness of the layers of the label 1 of this embodiment, excluding the release liner 40, is preferably 60 to 100 μm, more preferably 63 to 90 μm, and particularly preferably 65 to 80 μm.

[0084] <Label manufacturing method> The label can be produced by a known method. The label production method of the present invention includes providing a heat-sensitive adhesive layer on one surface of a substrate and providing a pressure-sensitive adhesive layer on the surface of the heat-sensitive adhesive layer opposite to the substrate, the pressure-sensitive adhesive layer containing a polymer component (A), and the content of a tackifier resin in the pressure-sensitive adhesive layer is 10 parts by mass or less per 100 parts by mass of the polymer component (A).

[0085] The pressure-sensitive adhesive layer having a tackifier resin content of 10 parts by mass or less relative to 100 parts by mass of the polymer component can be formed from a pressure-sensitive adhesive composition in which the tackifier resin content is blended at a ratio of 10 parts by mass or less relative to 100 parts by mass of the polymer component.

[0086] The ratio of the contents of the components that do not vaporize at room temperature in the pressure-sensitive adhesive composition is usually the same as the ratio of the contents of the components in the pressure-sensitive adhesive layer. In this specification, "room temperature" means a temperature that is not particularly cooled or heated, i.e., an ordinary temperature, and examples thereof include a temperature of 15 to 25°C.

[0087] First, a method for manufacturing a label according to the present invention will be described below, taking a method for manufacturing label 1 as an example. The manufacturing method of the label 1 of this embodiment includes providing a heat-sensitive adhesive layer 20 on one side of the substrate 10, and providing a pressure-sensitive adhesive layer 30 on the side of the heat-sensitive adhesive layer 20 opposite the side on which the substrate 10 is laminated.

[0088] For example, a heat-sensitive adhesive composition containing components constituting a heat-sensitive adhesive layer and, if desired, a solvent is applied onto the 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, and then dried to obtain a laminate A in which the substrate 10 and the heat-sensitive adhesive layer 20 are laminated. As the heat-sensitive adhesive composition, a commercially available heat-sealing agent can be used.

[0089] Furthermore, a pressure-sensitive adhesive composition containing the components constituting the pressure-sensitive adhesive layer 30 and, if desired, a solvent is prepared on the release liner 40, and the pressure-sensitive adhesive composition is applied to the release-treated 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 pressure-sensitive adhesive layer 30 are laminated.

[0090] Next, the exposed surface of the heat-sensitive adhesive layer 20 of the laminate A produced above and the exposed surface of the pressure-sensitive adhesive layer 30 of the laminate B are pressed together to produce a label 1 in which the substrate 10, the heat-sensitive adhesive layer 20, and the pressure-sensitive adhesive layer 30 are laminated in this order.

[0091] When the pressure-sensitive adhesive composition contains a crosslinking agent, a crosslinked structure can be formed by the crosslinking agent by leaving the pressure-sensitive adhesive layer formed thereon to stand for, for example, about 7 days at room temperature.

[0092] <How to use the label> The label of the embodiment can be used by being attached to an object that can be dry cleaned. Examples of items to be dry cleaned include clothing such as shirts, skirts, pants, hats, scarves, and socks, as well as bedding such as pillows and sheets, covers, curtains, lap blankets, shoes, and bags. The label is preferably attached to the fabric surface of the above items. Fabric refers to any material woven from natural or synthetic fibers.

[0093] In this specification, "dry cleaning" refers to any cleaning method that uses a solvent other than water. point The solvent is not particularly limited as long as it can be used for dry cleaning, and examples thereof include petroleum solvents such as perchloroethylene and gasoline, with perchloroethylene being preferred.

[0094] An example of a method for using the label of the embodiment includes a step of contacting the adhesive layer with an adherend, which is an object that can be dry cleaned, to pressure-sensitively adhere the label, and a step of heating the pressure-sensitively adhered label to heat-adhere the label to the adherend.

[0095] An example of a method for using the label of the embodiment is a method including a step of dry-cleaning an adherend and a label heat-adhered to the adherend.

[0096] The heating temperature can be determined appropriately depending on the composition of the heat-sensitive adhesive layer, and may be a temperature equal to or higher than the melting point of the heat-sensitive adhesive layer. For example, the heating temperature may be 80 to 250°C, 130 to 200°C, or 140 to 170°C.

[0097] In addition, when heating, heat and pressure bonding (adhesion by applying heat and pressure) using an iron or press machine can be used. The pressure on the label is 0.5 to 10 kg / cm. 2 The extent can be exemplified.

[0098] The label of the embodiment may have a surface that is printed or imprinted. The printing or imprinting may be applied to the surface of the substrate. A known printing device may be used for the printing or imprinting. The printing or imprinting may be performed before or after the label of the embodiment is attached to an adherend.

[0099] The following configurations can be exemplified as preferred uses of the cleaning label of the embodiment.

[0100] In the cleaning label of the embodiment, the substrate is printed with characters or prints, The printed or printed information is one or more dry cleaning information selected from the group consisting of owner information of the object to be dry cleaned with the cleaning label attached, information of the dry cleaning shop, a control code of the object, and a control number of the object, or It is preferable that the information on the object be one or more items selected from the group consisting of care instructions, washing symbols, sizes, washing or dry cleaning methods, material type, fiber composition, and the name of the person displaying them, regarding the object.

[0101] The label having the above-mentioned dry cleaning information can be used as a cleaning label that is attached to an article to be dry cleaned and then used together with the article after dry cleaning.

[0102] The label having the above-mentioned object information can be used as a quality label that is attached to an item to be dry cleaned and then used together with the item after dry cleaning.

[0103] Cleaning labels and quality labels are included in the cleaning label of the embodiment.

[0104] <Tag manufacturing method> The label embodiments described above can be applied to a structure including a second substrate and used to manufacture cleaning tags.

[0105] The method for manufacturing the cleaning tag of the embodiment includes pressure-sensitively adhering a second substrate to a second surface side of the cleaning label of the embodiment, the second surface side being opposite to a first surface side on which the first substrate of the adhesive layer is laminated, to obtain a laminate including the first substrate, the heat-sensitive adhesive layer, the adhesive layer, and the second substrate in this order; and heat-treating the laminate to heat-bond the first substrate and the second substrate via the heat-sensitive adhesive layer.

[0106] Examples of the first substrate include those exemplified as the substrate in the above embodiment. Examples of the heat-sensitive adhesive layer and the pressure-sensitive adhesive layer include those exemplified in the above embodiment.

[0107] Examples of the second substrate include those exemplified above as the first substrate. The second substrate is preferably a film, a cloth, or a nonwoven fabric.

[0108] The first substrate and the second substrate may each be a combination of the same materials, or a combination of different materials. For example, a combination in which the first substrate is fabric and the second substrate is fabric, or a combination in which the first substrate is fabric and the second substrate is film can be exemplified.

[0109] The total thickness of the layers of the tag of the embodiment is preferably 25 to 2000 μm, more preferably 50 to 1000 μm, and even more preferably 100 to 500 μm. [Example]

[0110] 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.

[0111] <Creating labels> [Example 1] A CRISPER (Toyobo Co., Ltd., model number: K2411, thickness: 50 μm) was prepared as a substrate. Next, a low-density polyethylene (Sumitomo Chemical Co., Ltd., Sumikasen, model number: L405, melting point: 111°C) was melt-extruded as a polyolefin-based heat-sensitive adhesive composition to a thickness of 15 μm to form a heat-sensitive adhesive layer on the substrate. An acrylic adhesive composition [a mixture of a polymer of 2-ethylhexyl acrylate (60 parts by mass), n-butyl acrylate (30 parts by mass), methyl acrylate (7 parts by mass), and acrylic acid (3 parts by mass), and a solvent of toluene (30 parts by mass)] (calculated Tg of polymer component = -52.7°C) was prepared, applied to a release liner using a knife coater so that the thickness after drying would be 10 μm, and dried at 100°C for 1 minute to form an adhesive layer. The exposed surface of the pressure-sensitive adhesive layer thus formed was placed on the exposed surface of the heat-sensitive adhesive layer of the laminate of the substrate and the heat-sensitive adhesive layer and pressure-bonded to obtain the label of Example 1.

[0112] [Example 2] The label of Example 2 was obtained by the same procedure as in Example 1, except that the heat-sensitive adhesive composition used in Example 1 was replaced with a polyolefin-based aqueous dispersion (Zaixen AC, manufactured by Sumitomo Seika Chemicals Co., Ltd., melting point 90°C), which was applied so that the thickness after drying would be 10 μm, and then dried.

[0113] [Example 3] The label of Example 3 was obtained by the same procedure as in Example 1, except that the heat-sensitive adhesive composition used in Example 1 was replaced with an EVA-based heat-sensitive adhesive composition (containing 5% by mass of vinyl acetate and having a melting point of 100°C).

[0114] [Example 4] The label of Example 4 was obtained by the same procedure as in Example 1, except that the heat-sensitive adhesive composition used in Example 1 was replaced with an EVA-based heat-sensitive adhesive composition (containing 42% by mass of vinyl acetate and having a melting point of 50°C).

[0115] [Example 5] The label of Example 5 was obtained by the same procedure as in Example 1, except that the heat-sensitive adhesive composition used in Example 1 was replaced with an EVA-based heat-sensitive adhesive composition (containing 14% by mass of vinyl acetate and 6% by mass of acrylic acid, with a melting point of 77°C), and the acrylic pressure-sensitive adhesive composition was replaced with a mixture of a polymer of 2-ethylhexyl acrylate (60 parts by mass), n-butyl acrylate (30 parts by mass), methyl acrylate (7 parts by mass), and acrylic acid (3 parts by mass), a crosslinker: aluminum tris(acetylacetonate) (0.5 parts by mass), and a solvent: toluene (30 parts by mass).

[0116] [Comparative Example 1] A label of Comparative Example 1 was obtained in the same manner as in Example 1, except that the adhesive layer was not provided.

[0117] Comparative Example 2 A label of Comparative Example 2 was obtained in the same manner as in Example 1, except that the heat-sensitive adhesive layer was not provided.

[0118] Comparative Example 3 The label of Comparative Example 3 was obtained by the same procedure as in Example 2, except that the adhesive composition used in Example 2 was replaced with one containing a petroleum resin-based tackifying resin (P-90, manufactured by Arakawa Chemical Industries, Ltd., softening point 90°C) [a mixture of a polymer of 2-ethylhexyl acrylate (60 parts by mass), n-butyl acrylate (30 parts by mass), methyl acrylate (7 parts by mass), and acrylic acid (3 parts by mass), the tackifying resin (10 parts by mass), and a solvent: toluene (30 parts by mass)].

[0119] Comparative Example 4 The label of Comparative Example 4 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a petroleum resin-based tackifying resin (P-140, softening point 140°C, manufactured by Arakawa Chemical Industry Co., Ltd.).

[0120] Comparative Example 5 The label of Comparative Example 5 was obtained by the same procedure as in Comparative Example 3, except that the tackifier resin used in Comparative Example 3 was replaced with a styrene-based tackifier resin (Yasuhara Chemical, YS Resin SX100, softening point 100°C).

[0121] Comparative Example 6 The label of Comparative Example 6 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a terpene-based tackifying resin (Yasuhara Chemical, YS Resin PX1000, terpene resin, softening point 100°C).

[0122] Comparative Example 7 The label of Comparative Example 7 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a terpene-based tackifying resin (Yasuhara Chemical, YS Resin PX1250, terpene resin, softening point 125°C).

[0123] [Comparative Example 8] The label of Comparative Example 8 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a terpene-based tackifying resin (Yasuhara Chemical, YS Resin TO105, aromatic terpene resin, softening point 105°C).

[0124] Comparative Example 9 The label of Comparative Example 9 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a terpene-based tackifying resin (Yasuhara Chemical, YS Polystar T100, terpene phenol resin, softening point 100°C).

[0125] [Comparative Example 10] The label of Comparative Example 10 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a terpene-based tackifying resin (Yasuhara Chemical, YS Polystar T160, terpene phenol resin, softening point 160°C).

[0126] [Comparative Example 11] The label of Comparative Example 11 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (Arakawa Chemical, A-100, rosin ester, softening point 100°C).

[0127] [Comparative Example 12] The label of Comparative Example 12 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (Arakawa Chemical, A-125, rosin ester, softening point 125°C).

[0128] [Comparative Example 13] The label of Comparative Example 13 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (Arakawa Chemical, HP, hydrogenated rosin ester, softening point 80°C).

[0129] [Comparative Example 14] The label of Comparative Example 14 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (manufactured by Yasuhara Chemical, D-125, polymerized rosin ester, softening point 125°C).

[0130] [Comparative Example 15] The label of Comparative Example 15 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (manufactured by Yasuhara Chemical, D-160, polymerized rosin ester, softening point 160°C).

[0131] [Comparative Example 16] The label of Comparative Example 16 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (KR-140, ultra-light-colored polymerized rosin, softening point 140°C, manufactured by Arakawa Chemical Industry Co., Ltd.).

[0132] [Comparative Example 17] The label of Comparative Example 17 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (KE-359, ultra-light-colored rosin ester, softening point 99°C, manufactured by Arakawa Chemical Industry Co., Ltd.).

[0133] [Comparative Example 18] The label of Comparative Example 18 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (Arakawa Chemical, D-6011, rosin-containing diol, softening point 91.5°C).

[0134] Comparative Example 19 The label of Comparative Example 19 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a rosin-based tackifying resin (KE-604, acid-modified rosin ester, softening point 129°C, manufactured by Arakawa Chemical Industry Co., Ltd.).

[0135] [Comparative Example 20] The label of Comparative Example 20 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a terpene-based tackifying resin (Arakawa Chemical, 803L, terpene phenol resin, softening point 152.5°C).

[0136] [Comparative Example 21] The label of Comparative Example 21 was obtained by the same procedure as in Comparative Example 3, except that the tackifying resin used in Comparative Example 3 was replaced with a terpene-based tackifying resin (Arakawa Chemical, 901, terpene phenol resin, softening point 130°C).

[0137] The compositions of the labels of the above examples and comparative examples are shown in Tables 1 to 3. In the tables, "-" indicates that the corresponding component is not contained.

[0138] [Table 1]

[0139] [Table 2]

[0140] [Table 3]

[0141] [Physical property evaluation] The labels produced in the above Examples and Comparative Examples were evaluated for the following physical properties.

[0142] (Measurement of adhesive strength of adhesive layer of label before heat-sensitive adhesion) The release liner was peeled off from each label obtained in the above Examples and Comparative Examples, and the label was placed on a cotton cloth (Kanakin No. 3, Japan Standards Association, JIS L0803 compliant) and adhered by rolling a 2000 g rubber roller back and forth once. warm After leaving it in an environment of 23°C and 50% RH for 30 minutes, the T between the label and cotton fabric was measured at a peeling speed of 300 mm / min in accordance with JIS K6854-3. shape The peel strength was measured. The measurement results are shown in Tables 1 to 3.

[0143] (Evaluation of dry cleaning resistance) After a dry cleaning test according to JIS L 0860 A1 method was carried out, it was visually determined whether peeling of the label had occurred. ×: Label peeling occurred over the entire surface of the applied area. △: The label peeled off in a part of the affixed area. ○: Almost no peeling occurred at the affixed area, but peeling was observed in part of the edge of the label. ◎: No peeling of the label was observed over the entire surface of the affixed area.

[0144] Test specimen Each label obtained in the above examples and comparative examples was cut to a width of 20 mm and a length of 30 mm, after which the release liner was peeled off and the label was attached to an adherend (Kanakin No. 3) using the same method as used to measure the adhesive strength before heat-sensitive bonding. Then, a pressure cooker is used to apply a load of 1 kg / cm 2 The mixture was heated under pressure at 140°C for 5 seconds. Test solution To 1 L of perchloroethylene, 5 g of anionic surfactant (di-2-ethylhexyl sodium sulfosuccinate), 5 g of nonionic surfactant (polyoxyethylene alkyl ether), and 1 mL of water were added and stirred well to dissolve the mixture, and the resulting homogeneous, transparent solution was used as the test solution. ·test 100 mL of the test liquid prepared above and 20 stainless steel balls were placed in a test bottle, and the test liquid was adjusted to 30°C ± 2°C. The test specimen was placed in the bottle, sealed, and attached to a washing test machine, which was run for 30 minutes at 30°C ± 2°C. The test specimen was removed from the test bottle, lightly rinsed with 100 mL of perchloroethylene, and then the excess liquid was removed and the specimen was dried in a dryer at 60°C or below. The evaluation results are shown in Tables 1 to 3.

[0145] The label of Comparative Example 1 did not have an adhesive layer and had no adhesive strength, meaning that the label of Comparative Example 1 lacked the adhesiveness required for pressure-sensitive adhesion to the target position before heat-sensitive adhesion was performed.

[0146] The label of Comparative Example 2 did not have a heat-sensitive adhesive layer and lacked dry cleaning resistance.

[0147] Furthermore, the labels of Comparative Examples 3 to 21, which contained more than 10 parts by mass of tackifier resin per 100 parts by mass of the polymer component of the adhesive layer, had a heat-sensitive adhesive layer and an adhesive layer, and although they had good adhesion suitability, they had poor dry-cleaning resistance.

[0148] On the other hand, the labels of Examples 1 to 5, which had a heat-sensitive adhesive layer and a pressure-sensitive adhesive layer but did not contain a tackifier resin in the pressure-sensitive adhesive layer, were excellent in adhesion suitability and dry-cleaning resistance.

[0149] In particular, the label of Example 5 had an adhesive layer formed from an adhesive composition containing a crosslinking agent, and was particularly excellent in dry cleaning resistance. In the label of Example 5, the heat-sensitive adhesive composition in the heat-sensitive adhesive layer contains carboxyl groups derived from acrylic acid, and the adhesive composition in the adhesive layer contains carboxyl groups derived from acrylic acid. These functional groups act as crosslinking points and are crosslinked by the crosslinking agent, which strengthens the adhesion at the interface between the adhesive layer and the heat-sensitive adhesive layer and prevents peeling at the interface. It is therefore presumed that this increases the strength against perchloroethylene and improves dry-cleaning resistance.

[0150] The configurations and combinations thereof in each embodiment are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to each embodiment, but is limited only by the scope of the claims. [Explanation of symbols]

[0151] 1... cleaning label, 10... substrate, 20... heat-sensitive adhesive layer, 30... adhesive layer, 40... release liner

Claims

1. A substrate; a heat-sensitive adhesive layer laminated on one surface of the substrate; a pressure-sensitive adhesive layer laminated on a surface of the heat-sensitive adhesive layer opposite to the surface on which the base material is laminated; Equipped with The pressure-sensitive adhesive layer contains a polymer component (A), the polymer component (A) is an acrylic pressure-sensitive adhesive composition, the content of structural units derived from 2-ethylhexyl acrylate is 50% by mass or more relative to 100% by mass of the polymer component (A), A cleaning label, wherein the adhesive layer is substantially free of a tackifying resin.

2. 2. The cleaning label according to claim 1, wherein the glass transition temperature (Tg) of the polymer component (A) is −40° C. or lower.

3. 3. The cleaning label according to claim 1, wherein the adhesive layer has a thickness of 15 μm or less.

4. The cleaning label according to any one of claims 1 to 3, wherein the melting point of the heat-sensitive adhesive layer is 130°C or lower.

5. The heat-sensitive adhesive layer contains a polymer component (B), the polymer component (A) contained in the pressure-sensitive adhesive layer and the polymer component (B) contained in the heat-sensitive adhesive layer are crosslinked via a crosslinking agent, the polymer component (A) contained in the pressure-sensitive adhesive layer contains an acrylic polymer having a structural unit derived from acrylic acid, the polymer component (B) contained in the heat-sensitive adhesive layer contains an ethylene-vinyl acetate copolymer having a structural unit derived from acrylic acid; The cleaning label according to any one of claims 1 to 4, wherein the cross-linking agent contains aluminum tris(acetylacetonate).

6. The cleaning label according to any one of claims 1 to 5, wherein the substrate is at least one selected from the group consisting of a foamed resin film, a synthetic paper having micropores, and a resin film having micropores.

7. a heat-sensitive adhesive layer provided on one surface of the substrate; providing a pressure-sensitive adhesive layer on the surface of the heat-sensitive adhesive layer opposite to the surface on which the substrate is laminated; the pressure-sensitive adhesive layer contains the polymer component (A), The method for producing a cleaning label according to any one of claims 1 to 6, wherein the adhesive layer is substantially free of a tackifier resin.

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