Label and container with label attached

Abstract

To provide an excellent label that has sufficient adhesive force, in which hot melt has high resistance and followability to misalignment of the label caused by expansion of a bottle during heating, that is less likely to be misaligned during high-temperature storage, and also less likely to be misaligned even during low-temperature storage, and that can easily remove an adhered object from a container by peeling the label off by hand without leaving any sticky residue.SOLUTION: A label has a specific adhesive layer (A) and an adhesive layer (B) on one end part (I) and the other end part (II) of a substrate film, respectively, and is wrapped around an outer periphery of a container.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present disclosure relates to labels and containers with such labels that are suitable for use on glass bottles, polyethylene terephthalate containers, and the like used for soft drinks, seasonings, detergents, shampoos, edible oils, cosmetics, pharmaceuticals, and the like. [Background technology]

[0002] In recent years, the amount of polyethylene terephthalate (hereinafter referred to as PET) bottles used for beverages has been increasing along with the production volume of PET bottles. PET bottles usually have a plastic label attached to the outside of the body to display the product name, etc. There are several methods for attaching a plastic label to the outside of the body of a PET bottle, including the "roll label method" and the "shrink label method."

[0003] The "roll label method" allows labels to be made thinner than those used in the "shrink label method," and it produces significantly less carbon dioxide than the "shrink label method," which uses large amounts of steam during labeling, so it has become increasingly popular in recent years.

[0004] In either method, it is required that used PET bottles are collected and can be recycled as raw materials. For example, the "Self-regulation Guidelines for Designated PET Bottles" issued by the PET Bottle Recycling Promotion Council lists the following two indicators. The first is that when pellets made by cutting up labeled bottles are immersed in a 1.5% sodium hydroxide solution at 85°C at a pellet concentration of 10% (by weight) and stirred for 15 minutes, the label must peel off from the PET pellets and no printing ink or adhesive must remain on the PET pellets. The second is that the label must be easily peeled off by hand and no label pieces or adhesive must remain on the bottle.

[0005] However, the hot melt adhesive used in the "roll label method" has a softening point of 90°C or less to make it easier to disperse in a 1.5% sodium hydroxide solution at 85°C. Therefore, when the beverage is heated in its container using a hot vending machine in winter, part of the label peels off, and so the "roll label method" has not been used.

[0006] In order to peel off the labels in the recycling process (alkali dispersion type), alkali dispersion type hot melt adhesive compositions have been developed and are used as label adhesives for containers such as PET bottles (Patent Documents 1 to 5).

[0007] Patent Document 1 discloses a water-dispersible hot melt adhesive composition containing a copolyester.

[0008] Patent Document 2 discloses a hot melt adhesive comprising a thermoplastic elastomer (A), a rosin-based tackifier (B) having an acid value of 100 to 300 mgKOH / g, a terpene phenol resin (C), a process oil (D), and a polypropylene wax (E) graft-polymerized with maleic anhydride.

[0009] Patent Document 3 discloses a hot melt adhesive containing a thermoplastic elastomer (A), a rosin-based tackifier (B) having an acid value of 100 to 300 mgKOH / g, a process oil (C), a wax (D) having a needle penetration at 25°C of 10 dmm or less, and a polyethylene glycol (E) having a number average molecular weight of 1,000 or more.

[0010] Patent Document 4 discloses a hot melt adhesive comprising a thermoplastic elastomer (A), a solid tackifier (B) having an acid value of 100 to 300 mgKOH / g, a liquid tackifier (C), a wax (D), and a specific nonionic surfactant (E).

[0011] Patent Document 5 discloses an alkali dispersion-type pressure-sensitive adhesive containing a thermoplastic elastomer (A), a tackifier (B), and a fatty acid having a melting point of 40° C. or higher and a derivative thereof (C).

[0012] Labels using hot melt adhesives disclosed in the cited documents 1 to 5 have sufficient adhesive strength and retention between alkali dispersion type plastic films, but when the container is heated, the adhesive strength is significantly reduced, and furthermore, the resistance and conformability of the hot melt adhesive composition to the label displacement caused by bottle expansion is lost, causing the label to peel off, and there is a problem with heat resistance. In addition, if the heat resistance is improved, there is also a problem that the label peels off even when a PET bottle stored at low temperature is dropped.

[0013] In other words, there was a demand for a label that had sufficient adhesive strength, had high hot melt resistance and conformability to the label's displacement due to the expansion of the bottle when heated, and was less likely to become displaced when stored at high temperatures and also when stored at low temperatures, and that left little adhesive residue on the bottle when physically peeled off by hand, etc. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Special Publication No. 11-512134 [Patent Document 2] JP 2010-90185 A [Patent Document 3] JP 2010-280878 A [Patent Document 4] JP 2012-1624 A [Patent Document 5] Patent Publication No. 2021-95443 Summary of the Invention [Problem to be solved by the invention]

[0015] To provide a label having sufficient adhesive strength, high resistance and conformability of a hot melt to the label being displaced due to the expansion of a bottle when heated, which is difficult to displace when stored at high temperature and also when stored at low temperature, and which leaves little adhesive residue on a bottle when the label is physically peeled off by hand, and a container to which the label is attached. [Means for solving the problem]

[0016] The present disclosure provides the following labels and containers having the labels attached thereto. [1]: A label to be attached by wrapping around the outer periphery of a container, the label having an adhesive layer (A) and an adhesive layer (B) on one end (I) and the other end (II) of a base film, respectively; The end portion (I) is a joint portion between the base film and the container, and the end portion (II) is a fixing portion where the base films are joined to each other after winding, The pressure-sensitive adhesive layer (a) is formed from a hot-melt pressure-sensitive adhesive (a), and the pressure-sensitive adhesive layer (b) is formed from a hot-melt pressure-sensitive adhesive (b), The hot melt pressure sensitive adhesive (a) satisfies the following requirement (1): A label characterized in that the softening point of the hot melt adhesive (b) is higher than 90°C. (1) When a 40 μm-thick biaxially oriented polypropylene film and a 100 μm-thick polyethylene terephthalate substrate are laminated with a 50 μm-thick adhesive layer (c) made of hot melt adhesive (a) and peeled off at a speed of 300 mm / min in a 180° direction in an environment of 23°C, the mass of the hot melt adhesive (a) remaining on the polyethylene terephthalate substrate side is 5% by mass or less of the entire adhesive layer (c).

[0017] [2]: The label according to [1], characterized in that it contains 5 to 35 mass% of a thermoplastic elastomer (A1) having a styrene content of 25 to 50 mass% in 100 mass% of the hot melt adhesive (b).

[0018] [3]: The label according to [2], further comprising, in 100% by mass of the hot melt adhesive (b), a thermoplastic elastomer (A2) having a styrene content of more than 5% by mass and less than 25% by mass, in an amount of more than 0% by mass and not more than 20% by mass.

[0019] [4]: The label according to [2] or [3], further comprising 5 to 40 mass% in total of polybutene (D) and / or process oil (E) in 100 mass% of the hot melt adhesive (b).

[0020] [5]: A label according to any one of [2] to [4], further comprising 20 to 70 mass% of a solid tackifier (B) and 1 to 20 mass% of a wax (C) in 100 mass% of the hot melt adhesive (b).

[0021] [6]: The label according to any one of [2] to [6], characterized in that a 25% by mass toluene solution of the thermoplastic elastomer (A1) has a viscosity of 100 to 50,000 mPa s at 25°C.

[0022] [7]: The label according to [5] or [6], characterized in that the melting point of the wax (C) is 90 to 160°C.

[0023] [8]: A container with a label bearing any of the following: [1] to [7].

[0024] [9]: The container according to [8], wherein the label is a body-wrapped label.

[0025]

[10] : The container according to [9], characterized in that the material of the container is polyethylene terephthalate.

[0026]

[11] : The container according to

[10] , characterized in that the container is for hot beverages. Effect of the Invention

[0027] The present disclosure makes it possible to provide a label and a container to which the label is attached that have sufficient adhesive strength, have high hot melt resistance and conformability to the label's displacement due to bottle expansion, and are less likely to become displaced when stored at high temperatures and also when stored at low temperatures, and that leave little glue residue on the bottle when easily and physically peeled off from the container by hand or the like. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] The present disclosure will be described in detail below. It should be noted that other embodiments are of course included in the scope of the present disclosure as long as they conform to the spirit of the present disclosure.

[0029] In this specification, a numerical range specified by using "~" includes the numerical values ​​before and after "~" as the lower and upper limit ranges. In addition, unless otherwise noted, each of the various components appearing in this specification may be used independently, either alone or in combination of two or more types. In addition, "parts" and "%" represent "parts by mass" and "% by mass", respectively, unless otherwise specified.

[0030] In this specification, the "softening point" was measured according to JIS K6863 (test method for softening point of hot melt adhesives). In this specification, the "viscosity of a 25% by mass toluene solution of a thermoplastic elastomer at 25°C" refers to the viscosity of a toluene solution of a thermoplastic elastomer having a solid content of 25% by mass measured at 25°C using a Brookfield viscometer under appropriate spindle and rotation speed conditions. In this specification, the "melting point of the wax" is a value measured by a differential scanning calorimeter (Shimadzu automatic differential calorimeter DSC-60A Plus).

[0031] In this specification, the term "hot melt" refers to a material that is in a solid or viscous state at room temperature and melts and softens to become fluid or liquid when heated.

[0032] <Label> The label of the present disclosure is a label to be attached by wrapping around the outer periphery of a container, the label having an adhesive layer (A) and an adhesive layer (B) at one end (I) and the other end (II) of a base film, respectively, wherein the end (I) is the joint between the base film and the container, and the end (II) is a fixed part where the base films are joined after wrapping, the adhesive layer (A) is formed from a hot melt adhesive (a) and the adhesive layer (B) is formed from a hot melt adhesive (b), the hot melt adhesive (a) satisfies the following requirement (1), and the softening point of the hot melt adhesive (b) is higher than 90°C. (1) When a 40 μm-thick biaxially oriented polypropylene film (hereinafter referred to as OPP) and a 100 μm-thick polyethylene terephthalate substrate are laminated with a 50 μm-thick adhesive layer (c) made of hot melt adhesive (a) and peeled off at a speed of 300 mm / min in a 180° direction in an environment of 23°C, the mass of the hot melt adhesive (a) remaining on the polyethylene terephthalate substrate side is 5% by mass or less of the entire adhesive layer (c). By simultaneously using hot melt adhesive (a) and hot melt adhesive (b) having a softening point higher than 90°C, it is possible to provide a label and a labeled container that have excellent heat resistance and leave little adhesive residue on the bottle when easily peeled off from a container by hand or the like.

[0033] The materials used for the hot melt pressure sensitive adhesive (a) and the hot melt pressure sensitive adhesive (b) are described below.

[0034] [Thermoplastic elastomer (A)] Thermoplastic elastomers are elastic materials that have the same properties as vulcanized rubber at room temperature, and at high temperatures they are polymeric materials that can be used with existing molding machines just like ordinary thermoplastic resins. Thermoplastic elastomers have both elastic rubber components in the molecules (soft segments: soft phase) and molecular restraint components (hard segments: hard phase) to prevent plastic deformation, so they have properties between rubber and plastic. Thermoplastic elastomers generally have a polystyrene block and a rubber middle block, with the polystyrene portion forming a physical crosslink (domain) and becoming the crosslinking point, and the middle rubber block giving the product rubber elasticity. The middle soft segment includes polybutadiene (B), polyisoprene (I) and polyolefin elastomers (ethylene-propylene (EP), ethylene-butylene (EB), butylene-butadiene (BB)), and depending on the arrangement with the hard segment polystyrene (S), they are divided into linear type and branched type (radial type).

[0035] Examples of the thermoplastic elastomer include styrene-based elastomers such as styrene-butadiene-styrene block copolymer (hereinafter sometimes abbreviated as SBS), styrene-ethylene-butylene-styrene block copolymer (hereinafter sometimes abbreviated as SEBS), styrene-ethylene-propylene-styrene block copolymer (hereinafter sometimes abbreviated as SEPS), styrene-isoprene-styrene block copolymer (hereinafter sometimes abbreviated as SIS), and styrene-butylene-butadiene-styrene block copolymer (hereinafter sometimes abbreviated as SBBS), as well as triblock block polymers such as methyl methacrylate-butyl acrylate-methyl methacrylate, and methyl methacrylate-butyl acrylate-methyl acrylate-methyl methacrylate, and diblock polymers thereof. As the thermoplastic elastomer (A) of the present disclosure, styrene-based elastomers such as styrene-ethylene-butylene-styrene block copolymer (SEBS) are preferred.

[0036] Thermoplastic elastomers are roughly classified into thermoplastic elastomers (A1) having a styrene content of 25% by mass or more and 50% by mass or less, thermoplastic elastomers (A2) having a styrene content of 5% by mass or more and less than 25% by mass, and other thermoplastic elastomers (A3). The styrene content refers to the content of styrene in the total mass of the thermoplastic elastomer.

[0037] [Solid tackifier (B)] The solid tackifier (B) used in the present disclosure is not particularly limited as long as it is solid at room temperature (23° C.). Examples of the solid tackifier (B) include phenolic resins, modified phenolic resins, terpene phenolic resins, xylene phenolic resins, cyclopentadiene-phenolic resins, xylene resins, aliphatic, alicyclic, and aromatic petroleum resins, hydrogenated aliphatic, alicyclic, and aromatic petroleum resins, phenol-modified petroleum resins, rosin ester resins, hydrogenated rosin, acid-modified rosin, hydrogenated rosin ester resins, low molecular weight polystyrene resins, terpene resins, and hydrogenated terpene resins.

[0038] Wax Waxes (C) are broadly classified into natural waxes (animal waxes (beeswax, etc.), plant waxes (japanese wax, rice bran wax, etc.), mineral waxes (okezolite, etc.), petroleum waxes (paraffin wax, microcrystalline wax, etc.)) and synthetic waxes (Fischer-Tropsch wax, polyethylene wax, polypropylene and acid-modified waxes, etc.). Waxes (C) are used alone or in combination of two or more kinds. From the viewpoints of adhesive strength and impact resistance, synthetic waxes are preferred as wax (C). More preferred are polypropylene wax and its acid-modified waxes from the viewpoint of adhesive strength (adhesion).

[0039] [Polybutene (D)] Polybutene (D) is a long-chain copolymer in which isobutene is the main monomer and normal butene is partially reacted as a secondary monomer. Unlike low-molecular-weight polyisobutylene in which purified isobutylene is the main monomer, the remaining fraction obtained by extracting butadiene from the C4 fraction produced by naphtha cracking can be used as it is as the monomer (raw material) for such polybutene. Note that polybutene may be a liquid polymer in which a small amount of butene-1 is copolymerized.

[0040] [Process oil (E)] Process oils (E) are oils that are generally used as plasticizers for rubber, thermoplastic elastomers, etc., and are process oils produced in petroleum refineries, etc., and are roughly classified into paraffinic process oils, naphthenic process oils, and aromatic process oils. Process oil is a mixture of aromatic rings, naphthenic rings, and paraffin chains, and naphthenic process oil in this application refers to process oil in which naphthenic ring carbons account for 35-46% by mass of the total carbon of the process oil. In addition, process oils in which aromatic carbons account for 30% by mass or more of the total carbon are classified as aromatic process oils, and process oils in which paraffin chain carbons account for 50% by mass or more of the total carbon are classified as paraffinic process oils.

[0041] <Hot melt adhesive (a)> The hot melt adhesive (a) is used to form an adhesive layer (I) at the end (I) which is the joint between the base film and the container. The hot melt adhesive (a) is formed by laminating a 40 μm thick biaxially oriented OPP film and a 100 μm thick PET base material with a 50 μm thick adhesive layer (C) made of the hot melt adhesive (a), and when the two are peeled off in a 180° direction at a speed of 300 mm / min in an environment of 23°C, the mass of the hot melt adhesive (a) remaining on the polyethylene terephthalate base material side is 5% by mass or less of the entire adhesive layer (C). This makes it possible for hot melt adhesive (a) to be an adhesive that "can be easily peeled off by hand and leaves no label fragments or adhesive behind on the bottle," conforming to the "voluntary control guidelines for designated PET bottles" issued by the PET Bottle Recycling Promotion Council. The closer to 0 the mass of the hot melt pressure sensitive adhesive (a) remaining on the polyethylene terephthalate substrate side is, the more preferable.

[0042] The hot melt pressure sensitive adhesive (a) preferably contains a thermoplastic elastomer (A), a solid tackifier (B1), and a polybutene (D) and / or a process oil (E).

[0043] The content of the thermoplastic elastomer (A) in 100% by mass of the hot melt pressure-sensitive adhesive (a) is preferably 5 to 40% by mass, more preferably 10 to 30% by mass, from the viewpoints of adhesive residue and adhesive strength. The thermoplastic elastomer (A) in 100% by mass of the hot melt pressure-sensitive adhesive (a) may be any one of the thermoplastic elastomers (A1), (A2) and (A3), and two or more types may be used in combination.

[0044] From the viewpoint of adhesive strength, the content of the solid tackifier (B) in 100 mass% of the hot melt adhesive (a) is preferably from 20 to 60 mass%, more preferably from 30 to 50 mass%.

[0045] The total content of the polybutene (D) and / or process oil (E) in 100% by mass of the hot melt pressure sensitive adhesive (a) is preferably 20 to 60% by mass, more preferably 30 to 60% by mass, from the viewpoints of adhesive residue and adhesive strength.

[0046] The hot melt adhesive (a) serves to bond the base film of the label to the container when the label of the present disclosure is wrapped around the outer periphery of the container, and naturally has adhesive strength to the container. If the adhesive strength is too weak, the film may peel off during labeling, or if the adhesive strength is too strong, the label film may break and leave adhesive residue. Therefore, when a 40 μm-thick OPP film and a 100 μm-thick PET substrate are laminated with a 50 μm-thick adhesive layer made of hot-melt adhesive (a) and peeled off in a 180° direction at a speed of 300 mm / min in an environment of 23° C., the adhesive strength is preferably 0.01 to 10 N / 15 mm, and more preferably 0.05 to 5 N / 15 mm.

[0047] (Method for producing hot melt pressure sensitive adhesive (a)) The hot melt adhesive (a) can be produced, for example, by mixing and dispersing the thermoplastic elastomer (A) into melted polybutene (D) and process oil (E) in a melting pot equipped with a stirrer, and then adding and mixing the solid tackifier (B).

[0048] The hot melt pressure sensitive adhesive (a) may be used by mixing the ingredients and molding them into a desired shape. Examples of the desired shape include granules, pellets, sheets, and blocks. These methods can be used by any known method without any restrictions.

[0049] <Hot melt adhesive (b)> The hot melt adhesive (b) is used to form an adhesive layer (ii) at the end (II), which is the fixed portion where the base film is bonded to each other after the label is wrapped around the container. There are no particular limitations on the hot melt adhesive (b) as long as it has a softening point higher than 90°C. By having a softening point higher than 90°C, it is possible to obtain the effect that the label does not peel off when placed in a hot bender. If a hot melt adhesive with a softening point of 90°C or less is used, the label may peel off when the PET bottle is moved during long storage in the hot bender.

[0050] The hot melt adhesive (b) may or may not have the property of leaving little adhesive residue when peeled off by hand. This is because the hot melt adhesive (b) is used in the part that bonds labels together, and even if the hot melt adhesive remains on the label when peeled off by hand, it does not adversely affect the recyclability of the PET bottle.

[0051] The hot melt pressure sensitive adhesive (b) preferably contains 5 to 35 mass% of a thermoplastic elastomer (A1) having a styrene content of 25 mass% or more and 50 mass% or less in 100 mass% of the hot melt pressure sensitive adhesive (b). By setting the content of the thermoplastic elastomer (A1) to 5 to 35 mass%, the adhesiveness (cohesive strength) can be kept good. It is more preferably 10 to 30 mass%, and even more preferably 15 to 25 mass%.

[0052] The thermoplastic elastomer (A1) contained in the hot melt pressure-sensitive adhesive (b) preferably has a viscosity of 100 to 50,000 mPa·s in a 25% by mass toluene solution at 25° C., more preferably 150 to 10,000 mPa·s, and even more preferably 250 to 5,000 mPa·s. When the viscosity is within the above range, both heat resistance and stringiness during coating can be achieved.

[0053] The hot melt pressure sensitive adhesive (b) preferably further contains a thermoplastic elastomer (A2) having a styrene content of 5% by mass or more and less than 25% by mass. The combined use of thermoplastic elastomers (A1) and (A2) makes it possible to provide excellent adhesion (adhesion) when the container is heated after the label is attached to the container, and to reduce stringiness when the hot melt adhesive (b) is applied to the label. However, the stringiness when the hot melt adhesive is applied to the label can also be reduced by changing the type of labeler that applies the hot melt adhesive to the label.

[0054] In addition to the thermoplastic elastomer (A1), the hot melt pressure-sensitive adhesive (b) preferably contains, in 100 mass% of the hot melt pressure-sensitive adhesive (b), a thermoplastic elastomer (A2) having a styrene content of 5 mass% or more and less than 25 mass%, in an amount of more than 0 mass% and not more than 20 mass%. By making the content of the thermoplastic elastomer (A2) more than 0 mass% and not more than 20 mass%, it is possible to maintain good adhesiveness (adhesion). It is more preferably 5 to 15 mass%.

[0055] In addition to the thermoplastic elastomer (A1), the hot melt adhesive (b) preferably contains 20-70% by mass of a solid tackifier (B) and 1-20% by mass of a wax (C) per 100% by mass of the hot melt adhesive (b). By setting the content of the solid tackifier (B) to 20-70% by mass, the adhesiveness (adhesion) can be kept good. Also, by setting the content of the wax (C) to 1-20% by mass, the cohesive force can be kept good. The content of the solid tackifier (B) is more preferably 30 to 60 mass %, and even more preferably 40 to 55 mass %. The content of the wax (C) is more preferably 3 to 15 mass %, and even more preferably 5 to 10 mass %.

[0056] The wax (C) contained in the hot melt pressure-sensitive adhesive (b) preferably has a melting point measured by a differential scanning calorimeter (DSC) in the range of 90 to 160°C. A melting point of 90°C or higher improves heat resistance and adhesiveness (cohesive strength), while a melting point of 160°C or lower improves the coatability of the hot melt pressure-sensitive adhesive. The melting point is more preferably 120 to 150°C or lower, even more preferably 130 to 150°C, and particularly preferably 140 to 150°C.

[0057] In addition to the thermoplastic elastomer (A1), the hot melt pressure-sensitive adhesive (b) preferably contains 5 to 40 mass% of polybutene (D) and / or process oil (E) in total relative to 100 mass% of the hot melt pressure-sensitive adhesive (b). By setting the total content of polybutene (D) and / or process oil (E) to 5 to 40 mass%, it is possible to improve heat resistance and cold resistance. The content of polybutene (D) is more preferably 10 to 25 mass%, and even more preferably 15 to 20 mass%.

[0058] The polybutene (D) contained in the hot melt adhesive (b) has a kinetic viscosity (JIS K2283) of 70 to 4000 mm at 100°C. 2 The kinematic viscosity at 100°C is preferably in the range of 70 mm / s. 2 / s or more, the adhesive strength (holding strength) of the label is strong, and the 2 By setting the kinematic viscosity at 100° C. to 150 to 1000 mm / s or less, it is possible to reduce adhesive residue when the label is peeled off by hand. 2 The method for measuring the kinetic viscosity is described in the Examples section.

[0059] The process oil (E) contained in the hot melt adhesive (b) has a kinetic viscosity (JIS K2283) of 20 to 500 mm at 40°C. 2 / s, and more preferably, 100 to 400 mm 2 / s. The kinetic viscosity at 40°C is 20mm 2 / s or more, the adhesive strength (holding power) of the label is strong, and the 2 / s or less, the label can be easily peeled off by hand.

[0060] Although not limited to the following embodiment, the hot melt pressure-sensitive adhesive (b) preferably contains a thermoplastic elastomer (A1), a solid tackifier (B), a wax (C), polybutene (D) and / or a process oil (E), and preferably further contains a thermoplastic elastomer (A2).

[0061] (Production of hot melt adhesive (b)) The hot melt pressure-sensitive adhesive (b) of the present disclosure can be produced, for example, by melting wax (C) and polybutene (D) and / or process oil (E) in a melting kettle equipped with a stirrer, mixing and dispersing thermoplastic elastomer (A) into the melted mixture, and then adding and mixing solid tackifier (B).

[0062] The hot melt pressure sensitive adhesive (b) may be used by mixing the ingredients and molding them into a desired shape. Examples of the desired shape include granules, pellets, sheets, and blocks. These methods can be used without any restrictions using known methods.

[0063] The hot melt adhesive (a) and the hot melt adhesive (b) may further contain other components within a range that does not impair the effects of the present disclosure. Examples of other components include colorants, antiblocking agents, inorganic fillers, antioxidants, bulking agents, flame retardants, plasticizers, antistatic agents, light stabilizers, ultraviolet absorbers, heavy metal deactivators, and fluorescent whitening agents. These components may be used alone or in combination of two or more.

[0064] The colorant may be a commonly used colorant such as red, blue, green, yellow, etc. The colorant may be any of pigments, dyes, and colorants, and examples of the colorant include monoazo, dizazo, azo lake, benzimidazolone, perylene, diketopyrrolopyrrole, condensed azo, anthraquinone, quinacridone, phthalocyanine, and anthraquinone, and examples of the pigment include pigment, perylene, monoazo, condensed azo, isoindolinone, titanium oxide, and carbon.

[0065] The antiblocking agent includes silicone, unsaturated fatty acid amides such as stearic acid amide, oleic acid amide, erucic acid amide, oleic acid amide and behenic acid amide.

[0066] Examples of the inorganic filler include particles and fibers of metals, metal oxides, metal hydroxides, etc. Specific examples include glass fibers, carbon fibers, calcium silicate, calcium titanate, aluminum borate fibers, flake glass, talc, kaolin, mica, hydrotalcite, calcium carbonate, zinc carbonate, zinc oxide, calcium hydrogen phosphate, wollastonite, silica, zeolite, alumina, boehmite, aluminum hydroxide, titanium oxide, silicon oxide, magnesium oxide, calcium silicate, alumina sodium silicate, magnesium silicate, carbon nanotube, graphite, copper, silver, aluminum, nickel, iron, calcium fluoride, mica, montmorillonite, apatite, etc.

[0067] Examples of the antioxidant include pentaerythritol tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, diethyl[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphonate, 4,6-bis(octylthiomethyl)-o-cresol, ethylene bis(oxyethylene)bis[3-(5-t-butyl-4-hydroxy-m-tolyl]propionate, tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-t-butylphenyl)pentaerythritol diphosphite, etc. These antioxidants may be used alone or in combination of two or more.

[0068] Examples of the filler include wet silica, aluminum hydroxide, aluminum oxide, magnesium oxide, montmorillonite, mica, smectite, organically modified montmorillonite, organically modified mica, and organically modified smectite.

[0069] Examples of the flame retardant include phosphorus-containing compound-based flame retardants, halogen-containing compound-based flame retardants, sulfonic acid metal salt-based flame retardants, and silicon-containing compound-based flame retardants.

[0070] Examples of the plasticizer include phthalate ester plasticizers, polyester plasticizers, aliphatic dibasic acid ester plasticizers, aliphatic monobasic acid ester plasticizers, phosphate ester plasticizers, citrate ester plasticizers, epoxy plasticizers, trimellitate ester plasticizers, tetrahydrophthalate ester plasticizers, glycol plasticizers, and bisphenol A alkylene oxide derivatives.

[0071] The antistatic agent may be any agent commonly used as an antistatic agent for plastics, and specific examples thereof include nonionic surfactants (e.g., fatty acid esters of polyhydric alcohols, ethylene oxide adducts of alkylamines, and fatty acid esters of ethylene oxide adducts of alkylamines), anionic surfactants (e.g., alkylbenzenesulfonates, higher alcohol sulfate salts), cationic surfactants (e.g., aliphatic amine salts, quaternary ammonium salts), and amphoteric surfactants (e.g., imidazoline type, betaine type, etc.).

[0072] Examples of the light stabilizer include hindered amine compounds and benzoate compounds.

[0073] Examples of the ultraviolet absorbing agent include a benzophenone-based ultraviolet absorbing agent, a triazine-based ultraviolet absorbing agent, and a benzotriazole-based ultraviolet absorbing agent.

[0074] The heavy metal deactivator includes a salicylic acid derivative, a hydrazide derivative, an oxalic acid amide derivative, and the like.

[0075] Examples of the fluorescent whitening agent include stilbene-based, coumarin-based, oxazole-based, and naphthalimide-based agents.

[0076] The content of the other components in the hot melt pressure-sensitive adhesive (a) and the hot melt pressure-sensitive adhesive (b) is preferably 0 to 40 mass% based on 100 mass% of the hot melt pressure-sensitive adhesive, more preferably 0 to 30 mass%, and further preferably 0 to 20 mass%.

[0077] <Label manufacturing method> The manufacturing method of the label of the present disclosure is not particularly limited. The label can be manufactured by applying a hot melt adhesive (a) to one end (I) of a base film and a hot melt adhesive (b) to the other end (II). Coating methods include an open wheel method, a closed gun method, and a direct coat method. The open wheel method and the direct coat method are preferred as methods that do not leave glue on PET bottles when peeled off.

[0078] The coating amount of the hot melt adhesive (a) and the hot melt adhesive (b) is independently 10 to 300 g / m 2 The coating amount is preferably 10 to 300 g / m 2 As a result, it exhibits excellent effects in terms of adhesiveness (adhesion) and the like.

[0079] <Base film> As the base film, biaxially oriented polypropylene (OPP), polyethylene (PE), PET, and even paper are usually used. In addition, as the label, a suitable printing is applied to the side opposite to the side to which the hot melt adhesive (b) is applied, i.e., the surface of the label, or to the side to which the hot melt adhesive (a) is applied, i.e., the backside of the label. In the present disclosure, the hot melt adhesive (a) can be applied to the printed side of the label that has been printed, or of course to the side that has not been printed, and in either case, it exhibits a predetermined adhesiveness and peelability. In addition, the printing may be performed on the entire backside of the label, or may be performed on only a part of the surface. The printing may be performed by any of the conventionally known printing methods, such as gravure printing and UV printing.

[0080] (container) The container of the present disclosure refers to a container to which the label of the present disclosure using the hot melt adhesive (a) and the hot melt adhesive (b) is attached. The material of the container includes glass, plastic, paper, etc., but is not particularly limited. In addition, the shape of the container may be round or non-round, such as square. When the container material is polyethylene terephthalate, examples of the label include a PET bottle with a label affixed to a portion of the body of the bottle, as well as a PET bottle with a label wrapped around the body of the bottle to cover it circumferentially.

[0081] The container of the present disclosure has high resistance and conformability of the hot melt to label shifting caused by the expansion of the bottle when heated, and the label is less likely to shift when stored at high temperatures, making it suitable for use with hot beverages. EXAMPLES

[0082] The present disclosure will be described in more detail below with reference to examples and comparative examples. However, the present disclosure is not limited to the following examples. In the examples, unless otherwise specified, "parts" refers to "parts by mass" and "%" refers to "% by mass".

[0083] [Method of measuring the melting point of wax (C)] The melting point of the wax (C) was measured using a differential scanning calorimeter (Shimadzu automatic differential calorimeter DSC-60A Plus). Approximately 5 mg of a sample was taken, cooled to 0°C, heated to 170°C at a heating rate of 10°C / min, and then cooled to 0°C at a cooling rate of -20°C / min. After being held at 0°C for 1 minute, it was heated again at a heating rate of 10°C / min, and the amount of heat released and absorbed when heated to 170°C was measured. The melting peak when the wax melted was taken as the melting point.

[0084] [Method for measuring kinematic viscosity of polybutene (D)] The kinetic viscosity of polybutene was measured in accordance with JIS K2283. The kinetic viscosity of polybutene (D) was measured at 100°C.

[0085] The raw materials used for the hot melt pressure sensitive adhesive (a) and the hot melt pressure sensitive adhesive (b) are shown below.

[0086] [Thermoplastic elastomer (A)] (Thermoplastic elastomer A1) Kraton G1650 (Kraton Polymers), styrene content: 30% by mass, viscosity of 25% solids in toluene at 25°C: 8,000 mPa s, SEBS Kraton G1651 (Kraton Polymers), styrene content: 33% by mass, viscosity of 25% solids in toluene solution at 25°C: 50,000 mPa·s or more, SEBS Kraton G1652 (Kraton Polymers), styrene content: 30% by mass, viscosity of 25% solids in toluene at 25°C: 1,800 mPa s, SEBS Kraton G1726 (Kraton Polymers), styrene content: 30% by mass, viscosity of 25% solids in toluene at 25°C: 200 mPa s, SEBS Kraton D1102 (Kraton Polymers), styrene content: 28% by mass, viscosity of 25% solids in toluene solution at 25°C: 1,100 mPa s, SBS Kraton D1162 (Kraton Polymers), styrene content: 43% by mass, viscosity of 25% solids in toluene solution at 25°C: 120 mPa s, SIS (Thermoplastic elastomer A2) Kraton D1161 (Kraton Polymers), styrene content: 15% by mass, viscosity of 25% solids in toluene solution at 25°C: 1,200 mPa s, SIS Kraton G1645 (Kraton Polymers), styrene content: 13% by mass, viscosity of 25% solids in toluene solution at 25°C: 120 mPa s or less, SEBS Kraton G1643 (Kraton Polymers), styrene content: 19% by mass, viscosity of 25% solids in toluene solution at 25°C: 200 mPa s, SEBS Kraton D1111 (Kraton Polymers), styrene content: 22% by mass, viscosity of 25% solids in toluene solution at 25°C: 1,100 mPa s, SIS (Thermoplastic elastomer A3) Kraton A1535 (Kraton Polymers), styrene content: 58% by mass, viscosity of 25% solids in toluene solution at 25°C: not soluble in toluene, not measurable, SEBS

[0087] [Solid tackifier (B)] ·RHR-301 (manufactured by China Wuzhou Sun Shine Forestry & Chemicals Co., LTD of Guangxi), hydrogenated rosin, acid value: 165mgKOH / g KE-604B: Pine Crystal KE-604B (Arakawa Chemical Co., Ltd.), acrylic modified rosin, acid value: 246 mg KOH / g Haritac AQ-90A (Harima Chemicals), modified rosin, Alcon P-70 (Arakawa Chemical Co., Ltd.), alicyclic saturated hydrocarbon resin, softening point: 70°C Alcon P-90 (Arakawa Chemical Co., Ltd.), alicyclic saturated hydrocarbon resin, softening point: 90°C Alcon P-100 (Arakawa Chemical Co., Ltd.), alicyclic saturated hydrocarbon resin, softening point: 100°C Alcon P-125 (Arakawa Chemical Co., Ltd.), alicyclic saturated hydrocarbon resin, softening point: 125°C

[0088] Wax NP805: Hiwax NP805 (Mitsui Chemicals), polypropylene wax, melting point 145℃ NP056: Hiwax NP056 (Mitsui Chemicals), polypropylene wax, melting point 124℃ PPMA6252: Ricothene PPMA6252 (Client Chemicals), acid-modified polypropylene wax, melting point: 140℃ POLYWAX655: POLYWAX655 (NuCera), polyethylene wax, melting point: 99°C Viscol 660P (Sanyo Chemical Industries, Ltd.), polyethylene wax, melting point: 136°C

[0089] [Polybutene (D)] HV-35 (ENEOS) 100℃ kinematic viscosity: 85mm 2 / s HV-50 (ENEOS) 100℃ kinematic viscosity: 110mm 2 / s HV-100 (ENEOS) 100℃ kinematic viscosity: 220mm 2 / s HV-300 (ENEOS) 100℃ kinematic viscosity: 590mm 2 / s

[0090] [Process oil (E)] PW-32: Diana Process Oil PW-32 (Idemitsu Kosan Co., Ltd.), 40℃ kinematic viscosity: 31mm 2 / s PW-90: Diana Process Oil PW-90 (Idemitsu Kosan Co., Ltd.), 40℃ kinematic viscosity: 95mm 2 / s PW-150: Diana Process Oil PW-150 (Idemitsu Kosan Co., Ltd.), 40℃ kinematic viscosity: 145mm 2 / s PW-380: Diana Process Oil PW-380 (Idemitsu Kosan Co., Ltd.), 40℃ kinematic viscosity: 381mm 2 / s PS-430: Diana Process Oil PS-430 (Idemitsu Kosan Co., Ltd.), 40℃ kinematic viscosity: 438mm 2 / s

[0091] [Antioxidants] IRG1010: Irganox 1010 (BASF), pentaerythritol tetrakis[3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate]

[0092] <Production of hot melt adhesive (a)> (Manufacturing example a-1) In a stainless steel beaker equipped with a stirrer, 33 parts of polybutene (D): HV-100 and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a homogeneous molten solution, and then 7 parts of thermoplastic elastomer (A): Kraton G1650 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 60 parts of solid tackifier (B): Alcon P-90 were added to obtain a homogeneous molten mixture, which was then cooled to produce hot melt adhesive a-1.

[0093] (Manufacturing example a-2) In a stainless steel beaker equipped with a stirrer, 39 parts of process oil (E): PW-90 and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a homogeneous molten solution, and then 40 parts of thermoplastic elastomer (A): Kraton G1726 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring, and after the addition was completed, the thermoplastic elastomer (A) was completely melted. Then, 21 parts of solid tackifier (B): Alcon P-100 were added to obtain a molten homogeneous mixture, which was then cooled to produce hot melt adhesive a-2.

[0094] (Production Examples a-3 and a-6) Except for changing the materials and compounding amounts as shown in Table 1, the same procedure as in Production Example a-2 was followed to produce hot melt pressure sensitive adhesives a-3 and a-6.

[0095] (Manufacturing example a-4) In a stainless steel beaker equipped with a stirrer, 30 parts of polybutene (D): HV-100, 41 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 8 parts of thermoplastic elastomer (A): Kraton D1650 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing to stir. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 21 parts of solid tackifier (B): Alcon P-125 were added to obtain a molten uniform mixture, which was then cooled to produce hot melt adhesive a-4.

[0096] (Manufacturing example a-5) A hot melt pressure sensitive adhesive a-5 was produced in the same manner as in Production Example a4, except that the materials and compounding amounts were changed to those shown in Table 1.

[0097] (Manufacturing example a-7) A hot melt pressure sensitive adhesive a-7 was produced in the same manner as in Production Example a-1, except that the materials and blending amounts were changed to those shown in Table 1.

[0098] (Manufacturing example a-8) In a stainless steel beaker equipped with a stirrer, 27 parts of process oil (E): PS-430 and 0.5 parts of antioxidant: IRG1010 were added and heated to melt. Heating was performed carefully so that the contents would reach 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 20 parts of solid tackifier (B): Alcon P-100 were gradually added to the molten solution while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the tackifier (B). Then, 18 parts of thermoplastic elastomer (A): Kraton G1726 and 10 parts of Kraton D1111 were gradually added, and after the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Thereafter, 25 parts of Alcon P-100 was added to form a molten homogeneous mixture, which was then cooled to produce a hot melt composition a-8.

[0099] (Comparative manufacturing example a'-1) In a stainless steel beaker equipped with a stirrer, 25 parts of process oil E: PW-90 and 0.5 parts of antioxidant IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 30 parts of solid tackifier (B): Alcon P-90 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the tackifier (B). Then, 10 parts of thermoplastic elastomer (A): Kraton G1650 were gradually added, and after the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 35 parts of Alcon P-90 were added to obtain a molten uniform mixture, which was then cooled to produce hot melt composition a'-1.

[0100] (Manufacturing example a'-2) In a stainless steel beaker equipped with a stirrer, 32 parts of polybutene (D): HV-100, 39 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents would be at 130 to 150°C. After melting, stirring was performed to obtain a homogeneous molten solution, and then 8 parts of thermoplastic elastomer (A): Kraton 1650 were gradually added to the molten solution while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt it. 21 parts of Alcon P-100 were added to obtain a homogeneous molten mixture, which was then cooled to produce hot melt adhesive a'-2.

[0101] <Hot melt residual test> (How to make the sample) A 40μm thick biaxially stretched OPP film was coated with a 50μm thick hot melt adhesive, and the resulting film was cut to a width of 15mm and its weight was measured (weight: Wa). This was then laminated to a 100μm thick PET film (weight: Wb) whose weight had been measured in advance to produce a sample. (Test Method) After storing for 24 hours or more in a constant temperature and humidity room at a temperature of 23°C and a humidity of 50%, the PET film was peeled off in a 180° direction at a speed of 300 mm / min using a tensile tester (Shimadzu Corporation, AGS-X), and the weight of the PET film after the tensile test (weight: Wc) was measured. The hot melt adhesive adhering to the peeled OPP film was removed with a solvent or the like, and the weight of the OPP film was measured (weight: Wd). The remaining rate was calculated using the following formula (1). If the OPP film broke and could not be peeled off, it was not possible to calculate the remaining rate, but the entire amount of hot melt was considered to remain, and the remaining rate was calculated as 100%. Survival rate (%)=((Wc-Wb) / (Wa-Wd))×100...Equation (1)

[0102] <Adhesion test> (How to make the sample) Samples for the adhesive strength test were prepared in the same manner as the samples for the hot melt remaining test. (Test Method) After storing the labels in a constant temperature and humidity room at 23°C and 50% humidity for 24 hours or more, the adhesive strength was measured when the labels were peeled off at a speed of 300 mm / min using a tensile tester (AGS-X, manufactured by Shimadzu Corporation). If the label broke during the measurement, the adhesive strength was deemed too strong and the measurement was not possible.

[0103] [Table 1]

[0104] <Production of hot melt adhesive with softening point of 90°C or higher> (Manufacturing example b-1) In a stainless steel beaker equipped with a stirrer, 1 part of wax (C): PPMA6252, 8 parts of Viscol 660P, 5 parts of polybutene (D): HV-100, 30 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 7 parts of thermoplastic elastomer (A1): Kraton G1651 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing to stir. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 49 parts of solid tackifier (B): RHR-301 were added to obtain a molten uniform mixture, which was then cooled to produce hot melt adhesive b-1 with a softening point of 90°C or higher.

[0105] (Manufacturing examples b-2~b-6, b-26, b-27, b-34, b-35) Hot melt pressure sensitive adhesives b-2 to b-6, b-26, b-27, b-34 and b-35 having a softening point of 90°C or higher were produced in the same manner as in Production Example b-1, except that the materials and compounding amounts were changed to those shown in Tables 2 to 4.

[0106] (Manufacturing example b-7) In a stainless steel beaker equipped with a stirrer, 5 parts of wax (C): PPMA6252, 10 parts of polybutene (D): HV-100, 25 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 5 parts of thermoplastic elastomer (A1): Kraton G1726 and 35 parts of thermoplastic elastomer (A2): Kraton G1645 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Thereafter, 20 parts of solid tackifier (B1): RHR-301 was added to form a molten homogeneous mixture, which was then cooled to produce a hot melt adhesive b-7 having a softening point of 90° C. or higher.

[0107] (Manufacturing examples b-8, b-9, b-29, b-32) Hot melt pressure sensitive adhesives b-8, b-9, b-29 and b-32 having a softening point of 90°C or higher were produced in the same manner as in Production Example b-7, except that the materials and compounding amounts were changed as shown in Tables 2 to 4.

[0108] (Manufacturing example b-10) In a stainless steel beaker equipped with a stirrer, 5 parts of wax (C): PPMA6252, 10 parts of polybutene (D): HV-100, 20 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 10 parts of thermoplastic elastomer (A1): Kraton G1652 and 10 parts of thermoplastic elastomer (A2): Kraton D1161 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 30 parts of solid tackifier (B1): RHR-301 and 15 parts by weight of solid tackifier (B2): Alcon P-125 were added to prepare a molten homogeneous mixture, which was then cooled to produce hot melt adhesive b-10 having a softening point of 90°C or higher.

[0109] (Manufacturing examples b-11, b-13, b-15, b-17~b-24, b-33) Hot melt pressure sensitive adhesives b-11, b-13, b-15, b-17 to b-24, and b-33 each having a softening point of 90°C or higher were produced in the same manner as in Production Example b-10, except that the materials and compounding amounts were changed to those shown in Tables 2 to 4.

[0110] (Manufacturing example b-12) In a stainless steel beaker equipped with a stirrer, 5 parts of wax (C): Viscol 660P, 10 parts of polybutene (D): HV-100, 25 parts of solid tackifier (B2): Alcon P-125, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 10 parts of thermoplastic elastomer (A1): Kraton G1650 and 10 parts of thermoplastic elastomer (A2): Kraton D1161 were gradually added to the molten solution while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Thereafter, 40 parts of solid tackifier (B): RHR-301 was added to prepare a molten homogeneous mixture, thereby producing a hot melt adhesive b-12 having a softening point of 90° C. or higher.

[0111] (Manufacturing example b-14) In a stainless steel beaker equipped with a stirrer, 5 parts of polybutene (D): HV-100, 15 parts of process oil (E): PW-150, 25 parts of solid tackifier (B2): Alcon P-100, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 10 parts of thermoplastic elastomer (A1): Kraton G1652 and 10 parts of thermoplastic elastomer (A2): Kraton G1643 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Thereafter, a solid tackifier (B1): 30 parts of RHR-301 and 5 parts of KE-604B was added to form a molten homogeneous mixture, thereby producing a hot melt adhesive b-14 having a softening point of 90° C. or higher.

[0112] (Manufacturing example b-31) A hot melt pressure sensitive adhesive b-31 having a softening point of 90° C. or higher was produced in the same manner as in Production Example b-14, except that the materials and blending amounts were changed to those shown in Table 4.

[0113] (Manufacturing example b-16) In a stainless steel beaker equipped with a stirrer, 5 parts of wax (C): NP056, 25 parts of polybutene (D): HV-100, 20 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 10 parts of thermoplastic elastomer (A1): Kraton G1652 and 10 parts of thermoplastic elastomer (A2): Kraton D1161 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 30 parts of solid tackifier (B1): RHR-301 was added to prepare a molten homogeneous mixture, which was then cooled to produce a hot melt adhesive b-16 having a softening point of 90° C. or higher.

[0114] (Manufacturing example b-25) In a stainless steel beaker equipped with a stirrer, 5 parts of wax (C): PPMA6252, 20 parts of process oil (E): PW-380, 25 parts of solid tackifier (B2): Alcon P-125, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 10 parts of thermoplastic elastomer (A1): Kraton G1652 and 10 parts of thermoplastic elastomer (A2): Kraton D1161 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 30 parts of solid tackifier (B1): RHR-301 was added to form a molten homogeneous mixture, which was then cooled to produce hot melt adhesive b-25 having a softening point of 90° C. or higher.

[0115] (Manufacturing example b-28) In a stainless steel beaker equipped with a stirrer, 10 parts of wax (C): NP056, 3 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were placed and heated to melt. Heating was performed carefully so that the contents would reach 130 to 150°C. After melting, stirring was performed to obtain a homogeneous molten solution, and then 20 parts of thermoplastic elastomer (A1): Kraton G1726 and 10 parts of thermoplastic elastomer (A2): Kraton D1161 were gradually added to the molten solution while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Then, 42 parts of solid tackifier (B1): RHR-301 and 15 parts by weight of solid tackifier (B2): Alcon P-125 were added to form a molten homogeneous mixture, which was then cooled to produce hot melt adhesive b-28 having a softening point of 90°C or higher.

[0116] (Manufacturing example b-30) In a stainless steel beaker equipped with a stirrer, 22 parts by weight of solid tackifier (B-2): Alcon P-125, 5 parts of wax (C): NP056, 10 parts of polybutene (D): HV-100, 8 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then while maintaining the temperature at 130 to 150°C and continuing stirring, 3 parts of thermoplastic elastomer (A1): Kraton G1650 and 2 parts of thermoplastic elastomer (A2): Kraton D1111 were gradually added to the melt, and after the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Thereafter, 50 parts of solid tackifier (B1): RHR-301 was added to form a molten homogeneous mixture, which was then cooled to produce a hot melt adhesive b-30 having a softening point of 90° C. or higher.

[0117] (Comparative manufacturing example b'-1) In a stainless steel beaker equipped with a stirrer, 5 parts of wax (C): PPMA6252, 20 parts of polybutene (D): HV-100, 10 parts of process oil (E): PW-380, and 0.5 parts of antioxidant: IRG1010 were added and melted by heating. Heating was performed carefully so that the contents were kept at 130 to 150°C. After melting, stirring was performed to obtain a uniform molten solution, and then 10 parts of thermoplastic elastomer (A1): Kraton G1652 and 10 parts of thermoplastic elastomer (A2): Kraton G1643 were gradually added to the melt while maintaining the temperature at 130 to 150°C and continuing stirring. After the addition was completed, the mixture was heated and stirred at a temperature of 130 to 150°C to completely melt the thermoplastic elastomer (A). Thereafter, 45 parts of solid tackifier (B1): RHR-301 was added to form a molten homogeneous mixture, which was then cooled to produce a hot melt adhesive b'-1 having a softening point of 90°C or lower.

[0118] [Table 2]

[0119] [Table 3]

[0120] [Table 4]

[0121] Example 1 One end of a 50 mm wide, 30 μm thick OPP sheet printed on one side (I) is coated with approximately 20 g / m of hot melt adhesive (a-1) on the printed surface. 2 Then, the hot melt adhesive (b-10) was applied to the printed surface of the other end (II) in an amount of about 20 g / m using a hand applicator (temperature of the adhesive composition: 150°C). 2 The adhesive composition was applied using a hand applicator (temperature of the adhesive composition: 150° C.) so as to obtain a label.

[0122] (Examples 2 to 42, Comparative Examples 1 to 3) Labels were produced in the same manner as in Example 1, except that the hot melt adhesives (a) and (b) were changed to those shown in Tables 5-9.

[0123] [Evaluation of labels wrapped around bottles] (Production of PET bottles with labels) The hot melt adhesive (a) of the label created on a PET bottle (Kirin's Gogo no Kocha Straight Tea 500ml square PET bottle) was attached to the PET bottle, the label was wrapped around the PET bottle, and the hot melt adhesive (b) was attached so that it adhered to the unprinted side of the label. The hot melt adhesives (a) and (b) were firmly pressed onto the PET bottle and label with a finger to create a labeled PET bottle.

[0124] <Cold resistance evaluation> (Test Method) The labeled PET bottles were then stored in a 5°C freezer for more than 24 hours to thoroughly cool them, after which they were dropped from a height of approximately 1m onto PVC flooring so that the bottom of the bottle hit the PVC flooring material, and the number of times the label could be peeled off was counted to evaluate their cold resistance. The more times the label was not peeled off, the better. Evaluation results of 2 to 5 were rated as passing, and evaluation result 1 was rated as failing. (Evaluation Criteria) 5: No peeling even after 10 drops. Very good. 4: Peeling occurred after 6 to 10 tries. Good. 3: Peeled off after 4 to 5 tries. Fairly good. 2: Peeled off after 2 or 3 tries. Usable. 1: Peeled off on the first try. Not practical.

[0125] <Heat resistance evaluation> (Test Method) Using the labeled PET bottles thus produced, the heat resistance was evaluated based on the holding strength of an adhesive area of ​​15 mm x 15 mm. Measurement temperature: 50℃ Load: 200g Measurement time: 24 hours Evaluation results 2 to 5, in which the holding power was 2 hours or more, were rated as passing, and evaluation result 1, in which the holding power was less than 2 hours, was rated as failing. (Evaluation Criteria) 5: No fallout in 24 hours. Very good. 4: Fall occurred between 12 and 24 hours. Good. 3: Falling in 6 to 12 hours. Fairly good. 2: The drop occurred within 2 to 6 hours. Practical use is possible. 1: It fell in less than 2 hours. Not practical.

[0126] <Hand peelability (hot melt residue)> (Test Method) The labeled PET bottles thus prepared were stored for 24 hours or more in an atmosphere of temperature: 23°C and relative humidity: 50%, after which the labels were peeled off by hand and the weight of the labeled PET bottle (weight: We), the weight of the label with hot melt adhesive (a) (weight: Wf) after only the hot melt adhesive (b) was wiped off from the peeled off label by hand with a solvent, the weight of the PET bottle with the hot melt (a) attached (weight: Wg), and the weight of the PET bottle from which the hot melt (a) was removed with a solvent (weight: Wh) were measured. The residual rate was calculated using the following formula (1) and evaluated according to the following criteria. Survival rate (%)=(Wi / Wj)×100...Equation (2) Weight of hot melt (a) remaining in the PET bottle: Wi = Wg-Wh Weight of total hot melt (a): Wj = We-Wf-Wh If the OPP film broke and could not be peeled off, it was not possible to calculate the remaining rate, but the entire amount of hot melt was considered to remain, and the remaining rate was recorded as 100%. The evaluation results ◎ and ◯ were considered to be pass, and the evaluation result × was considered to be fail. (Evaluation Criteria) ◎: Residual rate is 3% or less. Good. ○: Residual rate is more than 3% and less than 5%. Usable. ×: Residual rate exceeds 5%. Not practical.

[0127] [Table 5]

[0128] [Table 6]

[0129] [Table 7]

[0130] [Table 8]

[0131] [Table 9]

[0132] As can be seen from Tables 5 to 9, the labels using the two types of hot melt adhesives have heat resistance, cold resistance and manual peelability. On the other hand, Comparative Examples 1 to 3 (Table 9) did not achieve satisfactory results in terms of heat resistance, cold resistance and manual peelability. [Industrial Applicability]

[0133] As described above, the label of the present disclosure allows containers to be easily separated by peeling it off by hand when recycling them after use. When used on containers such as PET bottles, the label does not peel off even when heated by vendors or in stores. It has also been found that the same performance is exhibited not only on PET bottles but also on glass containers, making the hot melt adhesive composition suitable for recycling glass containers.

Claims

1. A label to be attached by wrapping around the outer periphery of a container, the label having an adhesive layer (A) and an adhesive layer (B) on one end (I) and the other end (II) of a base film, respectively, The end portion (I) is a joint portion between the base film and the container, and the end portion (II) is a fixing portion where the base films are joined to each other after winding, The pressure-sensitive adhesive layer (a) is formed from a hot-melt pressure-sensitive adhesive (a), and the pressure-sensitive adhesive layer (b) is formed from a hot-melt pressure-sensitive adhesive (b), The hot melt pressure sensitive adhesive (a) satisfies the following requirement (1): A label characterized in that the softening point of the hot melt adhesive (b) is higher than 90°C. (1) When a 40 μm-thick biaxially oriented polypropylene film and a 100 μm-thick polyethylene terephthalate substrate are laminated with a 50 μm-thick adhesive layer (c) made of a hot-melt adhesive (a) and peeled off at a speed of 300 mm / min in a 180° direction in an environment of 23° C., the mass of the hot-melt adhesive (a) remaining on the polyethylene terephthalate substrate side is 5% by mass or less of the entire adhesive layer (c).

2. The label according to claim 1, characterized in that it contains 5 to 35 mass% of a thermoplastic elastomer (A1) having a styrene content of 25 to 50 mass% per 100 mass% of the hot melt adhesive (b).

3. The label described in claim 2, characterized in that the hot melt adhesive (b) 100% by mass further contains a thermoplastic elastomer (A2) having a styrene content of more than 5% by mass or more and less than 25% by mass, in an amount of more than 0% by mass and not more than 20% by mass.

4. The label according to claim 2, characterized in that it further contains 5 to 40 mass % in total of polybutene (D) and / or process oil (E) based on 100 mass % of the hot melt adhesive (b).

5. The label according to claim 2, further comprising 20 to 70 mass% of a solid tackifier (B) and 1 to 20 mass% of a wax (C) based on 100 mass% of the hot melt adhesive (b).

6. The label according to claim 2, characterized in that a 25% by mass solution of the thermoplastic elastomer (A1) in toluene at 25°C has a viscosity of 100 to 50,000 mPa·s.

7. The label according to claim 5, characterized in that the melting point of the wax (C) is 90 to 160°C.

8. A container having the label according to any one of claims 1 to 7 attached thereto.

9. 9. The container of claim 8, wherein the label is a wraparound label.

10. 10. The container according to claim 9, wherein the material of the container is polyethylene terephthalate.

11. 11. The container of claim 10, wherein the container is for hot beverages.

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