Liquefaction treatment adhesive label, container with liquefaction treatment adhesive label, liquefaction treatment method of liquefaction treatment adhesive label, and liquefaction treatment method of container with liquefaction treatment adhesive label

Abstract

To provide a liquefaction treatment adhesive label which has a high liquefaction rate and has a little acid component contained in produced oil.SOLUTION: A liquefaction treatment adhesive label (100) capable of liquefaction treatment includes: a base material (10) which contains at least one resin selected from the group consisting of a polyolefin-based resin and a styrenic resin, and contains or does not contain an inorganic filler; and an adhesive layer (20) which is provided on one surface of the base material (10), and is formed of a hot melt adhesive composition which is at least one selected from the group consisting of an olefinic hot melt adhesive composition and a styrenic hot melt adhesive composition. A content when the inorganic filler is contained in the base material (10) is 30 mass% or less. The liquefaction treatment adhesive label (100) has a liquefaction rate determined by the following expression (Expression 1) of 60 mass% or more. Expression 1: RO=(PW / AW)×100.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an oil-treated adhesive label, a container with an oil-treated adhesive label, an oil treatment method for an oil-treated adhesive label, and an oil treatment method for a container with an oil-treated adhesive label.

Background Art

[0002] In recent years, for the purpose of building a recycling-oriented society, for example, it has been considered to support continuous recycling activities by actively promoting the reuse of plastic waste throughout society.

[0003] Generally, as recycling methods for plastic waste, there are material recycling, thermal recycling, and chemical recycling methods. Material recycling is a recycling method in which, for example, resin regenerated by treating plastic waste through processes such as pulverization and hot melting is reused as a resin material. Thermal recycling is a recycling method in which, for example, thermal energy generated by burning plastic waste is recovered and reused. Chemical recycling is a recycling method in which, for example, plastic waste is decomposed by chemical treatment and reused as fuel or as a monomer raw material or the like.

[0004] For example, as a recycling method for waste of polyester articles, mechanical recycling has been proposed as a process variation of material recycling.

[0005] For example, Patent Document 1 discloses a polyester structure having a layer made of a chemical recycling polyester resin obtained by chemically recycling a container made of a polyester resin mainly composed of ethylene terephthalate units and a layer made of a mechanical recycling polyester resin obtained by mechanically recycling a container made of a polyester resin mainly composed of ethylene terephthalate units.

[0006] For example, Patent Document 2 discloses an adhesive label material having a base material with at least one layer containing a recycled resin, a metallic luster layer laminated directly or via another layer on one side of the base material, and an adhesive layer laminated directly or via another layer on the metallic luster layer.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] As a method for recycling plastic waste, chemical recycling has also attracted attention. There is also an increasing interest in chemical recycling of waste adhesive labels and waste containing adhesive labels (hereinafter collectively referred to as waste adhesive labels). However, since adhesive labels have an adhesive layer, conventionally, chemical recycling of waste adhesive labels has not been actively studied. In particular, among chemical recycling of waste adhesive labels, oilification treatment of waste adhesive labels has hardly been studied. Furthermore, regarding the reuse of the produced oil obtained by oilification treatment of waste adhesive labels as naphtha from which fuel or monomer raw materials can be obtained, almost no attention has been paid so far.

[0009] When using the produced oil obtained from waste adhesive labels as fuel or naphtha, it is required that the sulfur component contained in the produced oil is low. Also, when using the produced oil obtained from waste adhesive labels, for example, it is desirable that the content of acid components is low in order to suppress corrosion when in contact with metal members and the like.

[0010] An object of the present invention is to provide an oiling-treated pressure-sensitive adhesive label having a high oiling rate and a small amount of acid components contained in the produced oil, a container with an oiling-treated pressure-sensitive adhesive label provided with the oiling-treated pressure-sensitive adhesive label, an oiling treatment method for the oiling-treated pressure-sensitive adhesive label, and an oiling treatment method for a container with an oiling-treated pressure-sensitive adhesive label provided with the oiling-treated pressure-sensitive adhesive label.

Means for Solving the Problems

[0011] [1] An oiling-treated pressure-sensitive adhesive label capable of being oiled, including at least one resin selected from the group consisting of polyolefin resins and styrene resins, and a base material containing or not containing an inorganic filler, an adhesive layer provided on one surface of the base material and formed of at least one hot-melt adhesive composition selected from the group consisting of olefin-based hot-melt adhesive compositions and styrene-based hot-melt adhesive compositions, comprising, when the base material contains the inorganic filler, the content is 30% by mass or less, and the oiling rate obtained by the following mathematical formula (Formula 1) is 60% by mass or more, an oiling-treated pressure-sensitive adhesive label. RO = (PW / AW) × 100 ··· (Formula 1) (In the mathematical formula (Formula 1), RO represents the oiling rate, PW represents the mass of the produced oil obtained by oiling the oiling-treated pressure-sensitive adhesive label, and AW represents the mass of the oiling-treated pressure-sensitive adhesive label subjected to the oiling treatment.)

[0012] [2] In the oiling-treated pressure-sensitive adhesive label according to [1], the olefin-based hot-melt adhesive composition contains an olefin-based elastomer, the styrene-based hot-melt adhesive composition contains a styrene-based elastomer, an oiling-treated pressure-sensitive adhesive label.

[0013] [3] In the oiling-treated pressure-sensitive adhesive label according to [1], The resin contained in the base material is the polyolefin resin, and the hot melt adhesive composition is the olefin-based hot melt adhesive composition. Oil-treated adhesive label.

[0014] [4] In the oil-treated adhesive label according to [1], the resin contained in the base material is the styrene resin, and the hot melt adhesive composition is the styrene-based hot melt adhesive composition. Oil-treated adhesive label.

[0015] [5] In the oil-treated adhesive label according to any one of [1] to [4], the hot melt adhesive composition contains a tackifier, and the tackifier contains at least one selected from the group consisting of aromatic petroleum resins, alicyclic petroleum resins, aliphatic petroleum resins, and aliphatic-aromatic copolymer petroleum resins. Oil-treated adhesive label.

[0016] [6] An oil-treated adhesive label-attached container provided with an oil-treated adhesive label, comprising a container containing at least one resin selected from the group consisting of polyolefin resins and styrene resins, and an oil-treated adhesive label attached to the surface of the container, and the oil-treated adhesive label is the oil-treated adhesive label according to any one of [1] to [5]. Oil-treated adhesive label-attached container.

[0017] [7] In the oil-treated adhesive label-attached container according to [6], the resin contained in the container is the polyolefin resin, The oiled adhesive label attached to the surface of the container is an oiled adhesive label comprising a base material containing a polyolefin resin and an adhesive layer provided on one surface of the base material and formed from an olefin-based hot melt adhesive composition. Container with an oiled adhesive label.

[0018] [8] In the container with an oiled adhesive label according to [6], The resin contained in the container is the styrene resin, The oiled adhesive label attached to the surface of the container is an oiled adhesive label comprising a base material containing a styrene resin and an adhesive layer provided on one surface of the base material and formed from a styrene-based hot melt adhesive composition. Container with an oiled adhesive label.

[0019] [9] An oiling treatment method for oiling an oiled adhesive label, comprising: A step of preparing an oiled adhesive label; A step of heating and pyrolyzing the prepared oiled adhesive label; A step of cooling the pyrolysis gas generated by the pyrolysis to obtain a produced oil; and having The oiled adhesive label is the oiled adhesive label according to any one of [1] to [5]. Oiling treatment method for an oiled adhesive label.

[0020]

[10] An oiling treatment method for oiling a container with an oiled adhesive label, comprising: A step of preparing a container with an oiled adhesive label, the container comprising at least one resin selected from the group consisting of a polyolefin resin and a styrene resin, and an oiled adhesive label attached to the surface of the container; A step of heating and pyrolyzing the prepared container with an oiled adhesive label; A step of cooling the pyrolysis gas generated by the pyrolysis to obtain a produced oil; and having The oil-chemical treatment adhesive label is the oil-chemical treatment adhesive label according to any one of [1] to [5]. An oil-chemical treatment method for a container with an oil-chemical treatment adhesive label.

Advantages of the Invention

[0021] According to one aspect of the present invention, it is possible to provide an oil-chemical treatment adhesive label having a high oil-chemical conversion rate and a small amount of acid components contained in the produced oil, a container with an oil-chemical treatment adhesive label provided with the oil-chemical treatment adhesive label, an oil-chemical treatment method for the oil-chemical treatment adhesive label, and an oil-chemical treatment method for a container with an oil-chemical treatment adhesive label provided with the oil-chemical treatment adhesive label.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0023] [Oil-chemical treatment adhesive label] The first embodiment of the present invention is an oil-chemical treatment adhesive label. Hereinafter, a preferred example of the present embodiment will be described.

[0024] The oilification-treated pressure-sensitive adhesive label according to this embodiment includes at least one resin selected from the group consisting of polyolefin resins and styrene resins, and includes a base material containing or not containing an inorganic filler, and is provided on one surface of the base material. It comprises an adhesive layer formed from at least one hot-melt adhesive composition selected from the group consisting of olefin-based hot-melt adhesive compositions and styrene-based hot-melt adhesive compositions. When the base material contains the inorganic filler, the content is 30% by mass or less. The oilification rate of the oilification-treated pressure-sensitive adhesive label is 60% by mass or more as determined by the following mathematical formula (Formula 1). RO = (PW / AW) × 100 ···(Formula 1) (In the mathematical formula (Formula 1), RO represents the oilification rate, PW represents the mass of the produced oil obtained by subjecting the oilification-treated pressure-sensitive adhesive label to an oilification treatment, and AW represents the mass of the oilification-treated pressure-sensitive adhesive label subjected to the oilification treatment.)

[0025] In this specification, the "oilification-treated pressure-sensitive adhesive label" means a pressure-sensitive adhesive label that can be oilified and can be reused as the produced oil obtained by the oilification treatment, and does not mean an oilified pressure-sensitive adhesive label. In this specification, the "pressure-sensitive adhesive label" includes a base material and an adhesive layer, and is a concept including sheet-shaped and tape-shaped pressure-sensitive adhesive labels regardless of whether they are individually partitioned. For example, when the pressure-sensitive adhesive label is attached to a release sheet, the pressure-sensitive adhesive label not only refers to the pressure-sensitive adhesive label after being individually separated from the release sheet, but also includes the pressure-sensitive adhesive label part before being individually separated from the release sheet, and further includes the entire area of the pressure-sensitive adhesive label layer including the pressure-sensitive adhesive label part in the state of being attached to the release sheet (hereinafter referred to as the pressure-sensitive adhesive label area).

[0026] According to the present embodiment, by having the above configuration, an oiled adhesive label with a high oiling rate and a small amount of acid components contained in the produced oil can be obtained. The inventors focused on the components contained in the adhesive layer in addition to the material of the base material, and studied the configuration of an adhesive label that can obtain a produced oil with a high oiling rate and a small amount of acid components when the adhesive label is oiled. As a result, the inventors found that the above characteristics can be obtained by configuring the base material and the adhesive layer with specific materials respectively. Therefore, the inventors consider that the oiled adhesive label according to the present embodiment having the above configuration is suitable for the oiling treatment because the above characteristics can be obtained.

[0027] Here, the oiled adhesive label according to the present embodiment will be described with reference to the drawings. In the drawings, there are parts illustrated in an enlarged or reduced manner for ease of explanation.

[0028] The schematic cross-sectional view shown in FIG. 1 shows an example of an oil-treated pressure-sensitive adhesive label. As shown in FIG. 1, the oil-treated pressure-sensitive adhesive label 100 includes a base material 10 and an adhesive layer 20. In the oil-treated pressure-sensitive adhesive label 100, the adhesive layer 20 is laminated on one surface of the base material 10, and the second adhesive layer surface 22 of the adhesive layer 20 is in direct contact with the first base material surface 11 of the base material 10. The base material 10 contains one or two resins selected from polyolefin resins and styrene resins. The base material 10 may contain only a polyolefin resin as a resin component, or may contain only a styrene resin. The base material 10 may or may not contain an inorganic filler. When the base material 10 contains an inorganic filler, the content of the inorganic filler contained in the base material 10 is 30% by mass or less (for example, more than 0% by mass and 30% by mass or less). In the oil-treated pressure-sensitive adhesive label 100, the adhesive layer 20 is formed from one or two hot-melt adhesive compositions selected from olefin-based hot-melt adhesive compositions and styrene-based hot-melt adhesive compositions. The adhesive layer 20 may be formed from a hot-melt adhesive composition of an olefin-based hot-melt adhesive composition, or may be formed from a hot-melt adhesive composition of a styrene-based hot-melt adhesive composition. In the oil-treated pressure-sensitive adhesive label 100, the second base material surface 12 is the outer surface of the oil-treated pressure-sensitive adhesive label 100, and the first adhesive layer surface 21 is the adhesive surface. When the oil-treated pressure-sensitive adhesive label 100 is oil-treated, the oiling rate obtained by the above-mentioned formula (Equation 1) is 60% by mass or more.

[0029] The schematic cross-sectional view shown in FIG. 2 shows an example of an oil-treated pressure-sensitive adhesive label sheet including an oil-treated pressure-sensitive adhesive label. Specifically, in the oil-treated pressure-sensitive adhesive label sheet 110 shown in FIG. 2, the oil-treated pressure-sensitive adhesive label 100 shown in FIG. 1 is provided in a state of being attached to a release sheet 30 as an oil-treated pressure-sensitive adhesive label portion 101A. That is, the base material 10 and the adhesive layer 20 in the oil-treated pressure-sensitive adhesive label portion 101A have the same configuration as the oil-treated pressure-sensitive adhesive label 100 shown in FIG. 1, and the same oiling rate can be obtained when oil-treated.

[0030] As shown in FIG. 2, the oil-treated pressure-sensitive adhesive label sheet 110 includes an oil-treated pressure-sensitive adhesive label area 101 having a base material 10 and a pressure-sensitive adhesive layer 20, and a release sheet 30. The pressure-sensitive adhesive surface (the first pressure-sensitive adhesive layer surface 21) of the oil-treated pressure-sensitive adhesive label area 101 is in contact with and attached to the release-treated surface 32 of the release sheet 30. In the oil-treated pressure-sensitive adhesive label area 101, the second pressure-sensitive adhesive layer surface 22 of the pressure-sensitive adhesive layer 20 is in direct contact with the first base material surface 11 on the side opposite to the second base material surface 12 which is the outer surface of the base material 10. That is, in the oil-treated pressure-sensitive adhesive label area 101, the pressure-sensitive adhesive layer 20 is provided on one surface of the base material 10, and the base material 10 and the pressure-sensitive adhesive layer 20 are laminated in this order from the second base material surface 12 which is the outer surface of the base material 10 toward the direction of the first pressure-sensitive adhesive layer surface 21 which is the pressure-sensitive adhesive surface. Therefore, the oil-treated pressure-sensitive adhesive label portion 101A also has a similar configuration.

[0031] The oil-treated pressure-sensitive adhesive label area 101 is provided with an oil-treated pressure-sensitive adhesive label portion 101A partitioned by the cuts 101X and an unnecessary portion 101Z which is a portion other than the oil-treated pressure-sensitive adhesive label portion 101A partitioned by the cuts 101X. By peeling and removing the unnecessary portion 101Z from the release sheet 30, only the oil-treated pressure-sensitive adhesive label portion 101A can be provided on the release-treated surface 32 of the release sheet 30. Since the unnecessary portion 101Z has the same configuration as the oil-treated pressure-sensitive adhesive label portion 101A (that is, the oil-treated pressure-sensitive adhesive label 100 shown in FIG. 1), even if the peeled and removed unnecessary portion 101Z is oil-treated, characteristics equivalent to those of the oil-treated pressure-sensitive adhesive label portion 101A can be obtained.

[0032] The oil-treated adhesive label portion 101A can be used as the oil-treated adhesive label 100 shown in FIG. 1 by being peeled off from the release sheet 30. Specifically, the oil-treated adhesive label portion 101A is separately separated from the release sheet 30 of the oil-treated adhesive label sheet 110 between the first adhesive layer surface 21 of the adhesive layer 20 and the release-treated surface 32 of the release sheet 30 and is provided for use. When the separately separated oil-treated adhesive label portion 101A is used, the adhesive layer 20 of the oil-treated adhesive label portion 101A is attached to the surface of the object to be used. Separation of the oil-treated adhesive label portion 101A from the oil-treated adhesive label sheet 110 can be achieved, for example, by using an automatic labeling device.

[0033] As described above, with reference to FIGS. 1 and 2, an example of the oil-treated adhesive label and the oil-treated adhesive label sheet including the oil-treated adhesive label according to the present embodiment has been described. However, the oil-treated adhesive label according to the present embodiment is not limited thereto. The oil-treated adhesive label according to the present embodiment can adopt various forms as long as it includes the above-mentioned specific base material and specific adhesive layer. For example, in the oil-treated adhesive label area 101, an oil-treated adhesive label portion 101A partitioned between the cuts 101X and an unnecessary portion 101Z partitioned between the cuts 101X are provided. However, a configuration may be adopted in which the unnecessary portion 101Z is not provided and only the oil-treated adhesive label portion 101A partitioned between the cuts 101X is provided. Also, in FIG. 2, the oil-treated adhesive label sheet 110 is shown with the oil-treated adhesive label area 101 attached to the release sheet 30. However, it may be composed of an oil-treated adhesive label area 101 that does not have the release sheet 30 and is not attached to the release sheet 30. In this case, the oil-treated adhesive label area 101 that is not attached to the release sheet 30 may have a configuration in which the unnecessary portion 101Z is not provided and only the oil-treated adhesive label portion 101A partitioned by the cuts 101X is provided. Furthermore, for example, in the oil-treated pressure-sensitive adhesive label 100 shown in FIG. 1 and the oil-treated pressure-sensitive adhesive label portion 101A shown in FIG. 2, a decorative layer may be provided on one or both of the second substrate surface 12 and the first substrate surface 11 of the substrate 10. The decorative layer may be, for example, a printing layer. The printing layer can be formed, for example, by printing methods such as flexographic printing, gravure printing, offset printing, screen printing, and inkjet printing. The printing layer is preferably at least one selected from the group consisting of figures, colors, characters, symbols, photographs, and patterns. The printing layer may be provided, for example, with at least one printing layer selected from the group consisting of figures, colors, characters, symbols, photographs, and patterns on top of the solid printing layer. Also, a part of the adhesive layer may be subjected to an anti-tack treatment by printing or the like.

[0034] Hereinafter, a preferred example of the configuration of the oil-treated pressure-sensitive adhesive label according to the present embodiment will be described.

[0035] <Substrate> In the oil-treated pressure-sensitive adhesive label according to the present embodiment, the substrate contains at least one resin selected from the group consisting of polyolefin resins and styrene resins. As long as the substrate contains at least one resin selected from the group consisting of polyolefin resins and styrene resins, a vapor deposition film may be provided on at least one of one surface (first substrate surface) and the other surface (second substrate surface) of the substrate. The vapor deposition film may be a metal vapor deposition film or an inorganic oxide vapor deposition film. Examples of the metal vapor deposition film include an aluminum vapor deposition film. Examples of the inorganic oxide vapor deposition film include at least one selected from the group consisting of an alumina (AlOx) vapor deposition film and a silica (SiOx) vapor deposition film. In this specification, when the substrate includes a vapor deposition film, the vapor deposition film is a concept included as a part of the substrate. The substrate may be, for example, a resin film containing at least one resin selected from the group consisting of polyolefin resins and styrene resins, or a metal vapor deposition film containing at least one resin selected from the group consisting of polyolefin resins and styrene resins.

[0036] The base material can use either one of the polyolefin resin or the styrene resin alone. The base material can also use both resins of the polyolefin resin and the styrene resin mixed. It is preferable that the resin contained in the base material is only the polyolefin resin. It is also preferable that the resin contained in the base material is only the styrene resin. By including at least one resin selected from the group consisting of the polyolefin resin and the styrene resin in the base material, an oiling treatment adhesive label with a high oiling rate and few acid components contained in the produced oil can be obtained.

[0037] The polyolefin resin used for the base material is not particularly limited. Examples of the polyolefin resin include at least one selected from the group consisting of polyethylene, ethylene-α-olefin copolymer, polypropylene, propylene-α-olefin copolymer, polybutene, polybutadiene, polymethylpentene, ethylene-norbornene copolymer, norbornene resin, ethylene-vinyl acetate copolymer, ethylene-(meth)acrylic acid copolymer, and ethylene-(meth)acrylate copolymer. The polyolefin resin may be used alone or in combination of two or more. Among these, the polyolefin resin is preferably at least one polyethylene-based resin selected from the group consisting of polyethylene and ethylene-α-olefin copolymer, and at least one polypropylene-based resin selected from the group consisting of polypropylene and propylene-α-olefin copolymer, and more preferably at least one polypropylene-based resin selected from the group consisting of polypropylene and propylene-α-olefin copolymer.

[0038] The ethylene-α-olefin copolymer is a copolymer containing the largest number of ethylene constituent units. The propylene-α-olefin copolymer is a copolymer containing the largest number of propylene constituent units. Examples of the ethylene-α-olefin copolymer include an ethylene-α-olefin copolymer obtained by copolymerizing ethylene and at least one α-olefin selected from the group consisting of propylene, 1-butene, 1-hexene, 1-heptene, and 4-methyl-1-pentene. Examples of the propylene-α-olefin copolymer include a propylene-α-olefin copolymer obtained by copolymerizing propylene and at least one α-olefin selected from the group consisting of ethylene, 1-butene, 1-hexene, 1-heptene, and 4-methyl-1-pentene.

[0039] The styrenic resin used for the base material is not particularly limited. The styrenic resin is a polymer polymerized from a monomer containing at least one styrenic monomer selected from the group consisting of styrene, ο-methylstyrene, p-methylstyrene, p-tert-butylstyrene, 1,3-dimethylstyrene, and α-methylstyrene. The styrenic resin may be either a homopolymer consisting of a styrenic monomer or a copolymer consisting of a styrenic monomer and a monomer other than the styrenic monomer, or a mixture of these homopolymers and copolymers. Examples of the styrenic resin include at least one selected from the group consisting of polystyrene, acrylonitrile-styrene copolymer, methyl methacrylate-styrene copolymer, acrylonitrile-methyl acrylate-styrene copolymer, polystyrene obtained by graft-polymerizing polybutadiene onto polystyrene, acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, and styrene-butadiene block copolymer. The styrenic resin may be used alone or in combination of two or more. Among these, the styrenic resin is preferably at least one selected from the group consisting of polystyrene obtained by graft-polymerizing polybutadiene onto polystyrene, acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, and styrene-butadiene block copolymer.

[0040] At least one foamed resin selected from the group consisting of foamed polyolefin resins such as foamed polypropylene and foamed polyethylene, and foamed styrenic resins such as foamed polystyrene can also be used for the base material. The foamed resin used as the base material is, in one aspect, obtained by generating fine cavities when the resin is stretched. For example, when the base material contains an inorganic filler described later, when the base material containing the inorganic filler is stretched, fine cavities are formed around the inorganic filler in the base material, thereby imparting a texture similar to that of white paper and obtaining a porous base material having properties similar to those of paper. Such a foamed base material having properties similar to those of paper is also referred to as so-called synthetic paper.

[0041] The base material contains an inorganic filler or does not contain an inorganic filler. The inorganic filler used for the base material is not particularly limited. Examples of the inorganic filler include at least one selected from the group consisting of kaolin, calcined clay, calcium carbonate, talc, mica, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, magnesium oxide, silica, alumina, and satin white. The inorganic filler may be used alone or in combination of two or more. Among these, from the viewpoint of visibility when a decorative layer is provided on the oiled adhesive label, the inorganic filler is preferably a white inorganic filler. In this specification, white may be any color tone that can generally be recognized as white. From the same viewpoint, the inorganic filler is more preferably at least one selected from the group consisting of calcium carbonate and titanium dioxide. Note that a resin film that can generally be recognized as white is a white resin film, and a resin film that can generally be recognized as transparent is a transparent resin film.

[0042] When the base material contains an inorganic filler, the content of the inorganic filler contained in the base material is 30% by mass or less based on the entire base material. From the viewpoint of further improving the oiling rate, the proportion of the inorganic filler contained in the base material is preferably 25% by mass or less, and more preferably 20% by mass or less. When the base material contains an inorganic filler, the content of the inorganic filler is preferably more than 0% by mass, more preferably 3% by mass or more, still more preferably 5% by mass or more, and even more preferably 8% by mass or more.

[0043] If an oiled adhesive label with a high oiling rate and a small amount of acid components contained in the produced oil can be obtained for the base material, various additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, a dispersant, and a lubricant may be contained as necessary.

[0044] The base material may be an unstretched base material, a uniaxially stretched base material, or a biaxially stretched base material. The base material may be a single layer or a laminate of two or more layers. When the base material is a laminate, at least one resin selected from the group consisting of polyolefin resins and styrene resins is contained in all the layers.

[0045] The thickness of the base material is not particularly limited. For example, the thickness of the base material may be 10 μm or more and 300 μm or less. The thickness of the base material is preferably 20 μm or more, more preferably 25 μm or more. The thickness of the base material is preferably 200 μm or less, more preferably 100 μm or less.

[0046] <Adhesive layer> In the oiling-treated adhesive label according to the present embodiment, the adhesive layer is formed of a hot-melt adhesive composition which is at least one selected from the group consisting of an olefin-based hot-melt adhesive composition and a styrene-based hot-melt adhesive composition. The adhesive layer may be formed of either an olefin-based hot-melt adhesive composition or a styrene-based hot-melt adhesive composition. The adhesive layer may be formed by both an olefin-based hot-melt adhesive composition and a styrene-based hot-melt adhesive composition. In this case, the adhesive layer may be formed by a hot-melt adhesive composition using an olefin-based base polymer and a styrene-based base polymer in combination. By forming the adhesive layer from a hot-melt adhesive composition which is at least one selected from the group consisting of an olefin-based hot-melt adhesive composition and a styrene-based hot-melt adhesive composition, an oiling-treated adhesive label having a high oiling rate and a small amount of acid components contained in the produced oil can be obtained.

[0047] In this specification, the hot-melt adhesive composition refers to an adhesive composition of a type that can be melted by heating to be spreadable for coating and exhibits adhesiveness and cohesive force by cooling.

[0048] (Olefin-based hot-melt adhesive composition) The olefin-based hot melt adhesive composition is not particularly limited. The olefin-based hot melt adhesive composition preferably contains, for example, an olefin-based base polymer, a tackifier, and a plasticizer.

[0049] The olefin-based base polymer preferably contains an olefin-based elastomer. The olefin-based elastomer is not particularly limited. The olefin-based elastomer may be, for example, an olefin-based elastomer polymerized using a Ziegler-Natta catalyst or an olefin-based elastomer polymerized using a metallocene catalyst. Examples of the olefin-based elastomer include at least one selected from the group consisting of (1) a homopolymer elastomer of an α-olefin having 4 or more and 10 or less carbon atoms, (2) an ethylene-propylene copolymer elastomer, (3) an ethylene-α-olefin copolymer elastomer having 4 or more and 10 or less carbon atoms, (4) a propylene-α-olefin copolymer elastomer having 4 or more and 10 or less carbon atoms, and (5) an ethylene-propylene-α-olefin copolymer elastomer having 4 or more and 10 or less carbon atoms. The ethylene-propylene copolymer elastomer and the ethylene-α-olefin copolymer elastomer having 4 or more and 10 or less carbon atoms are copolymer elastomers containing the largest number of ethylene structural units. The propylene-α-olefin copolymer elastomer having 4 or more and 10 or less carbon atoms is a copolymer elastomer containing the largest number of propylene structural units. Examples of the olefin-based elastomer include, specifically, at least one olefin-based elastomer selected from the group consisting of polybutene elastomer, polyisobutylene elastomer, ethylene-propylene copolymer elastomer, ethylene-butene copolymer elastomer, ethylene-octene copolymer elastomer, and ethylene-propylene-butene copolymer elastomer. The olefin-based elastomer may be used alone or in combination of two or more. The olefin-based elastomer may be a block copolymer.

[0050] The olefin-based polymer may, if necessary, further contain at least one polyolefin resin of polyethylene and polypropylene in addition to the olefin-based elastomer. When the olefin-based polymer contains at least one of polyethylene and polypropylene, the content of these polyolefin resins is preferably less than that of the olefin-based elastomer. Specifically, with respect to a total of 100 parts by mass of the olefin-based elastomer and at least one of polyethylene and polypropylene, at least one of polyethylene and polypropylene is preferably less than 50% by mass, and more preferably 45% by mass or less. Polyethylene and polypropylene may be resins synthesized by known polymerization methods. Polyethylene and polypropylene may be, for example, resins synthesized with a metallocene catalyst or resins polymerized using a Ziegler-Natta catalyst.

[0051] The content of the olefin-based polymer is preferably 20% by mass or more, more preferably 23% by mass or more, and even more preferably 25% by mass or more with respect to the whole (100% by mass) of the olefin-based hot melt adhesive composition. The content of the olefin-based polymer is preferably 55% by mass or less, more preferably 53% by mass or less, and even more preferably 50% by mass or less with respect to the whole (100% by mass) of the olefin-based hot melt adhesive composition.

[0052] The tackifier is not particularly limited. Examples of the tackifier include at least one selected from petroleum resins, terpene resins, rosin resins, styrene resins, and the like. Examples of the petroleum resin include aromatic petroleum resins, alicyclic petroleum resins, aliphatic petroleum resins, and aliphatic-aromatic copolymer petroleum resins. Among these, from the viewpoint of easily obtaining an oil-modified pressure-sensitive adhesive label having a high oil-modification rate and a small amount of acid components contained in the produced oil, the tackifier preferably contains at least one selected from the group consisting of aromatic petroleum resins, alicyclic petroleum resins, aliphatic petroleum resins, and aliphatic-aromatic copolymer petroleum resins. From the same viewpoint, the tackifier preferably contains a rosin resin. From the same viewpoint, the tackifier preferably contains a petroleum resin and a rosin resin. From the viewpoint of more easily obtaining a higher oil-modification rate, the tackifier is preferably at least one selected from the group consisting of aromatic petroleum resins, alicyclic petroleum resins, aliphatic petroleum resins, and aliphatic-aromatic copolymer petroleum resins. Here, aromatic petroleum resins, alicyclic petroleum resins, aliphatic petroleum resins, and aliphatic-aromatic copolymer petroleum resins are all concepts that also include hydrogenated petroleum resins obtained by hydrogenating each of aromatic petroleum resins, alicyclic petroleum resins, aliphatic petroleum resins, and aliphatic-aromatic copolymer petroleum resins. The hydrogenated petroleum resin includes not only fully hydrogenated petroleum resins but also partially hydrogenated petroleum resins.

[0053] The content of the tackifier is preferably 20% by mass or more, more preferably 23% by mass or more, and still more preferably 25% by mass or more with respect to the whole olefin-based hot-melt adhesive composition (100% by mass). The content of the tackifier is preferably 70% by mass or less, more preferably 68% by mass or less, and still more preferably 65% by mass or less with respect to the whole olefin-based hot-melt adhesive composition (100% by mass).

[0054] The plasticizer is not particularly limited. Examples of the plasticizer include petroleum process oils (such as paraffinic process oils, naphthenic process oils, and aromatic process oils), natural oils (such as olive oil, camellia oil, castor oil, and tall oil), dibasic acid dialkyls (such as dibutyl phthalate, dioctyl phthalate, and dibutyl adipate), and liquid resins (such as liquid polybutene and liquid polyisoprene). The plasticizer may be used alone or in combination of two or more kinds.

[0055] The content of the plasticizer is preferably 5% by mass or more, more preferably 8% by mass or more, and still more preferably 10% by mass or more with respect to the whole olefin-based hot melt adhesive composition (100% by mass). The content of the plasticizer is preferably 40% by mass or less, more preferably 38% by mass or less, and still more preferably 35% by mass or less with respect to the whole olefin-based hot melt adhesive composition (100% by mass).

[0056] (Styrene-based hot melt adhesive composition) The styrene-based hot melt adhesive composition is not particularly limited. The styrene-based hot melt adhesive composition preferably contains, for example, a styrene-based base polymer, a tackifier, and a plasticizer.

[0057] The styrene-based polymer preferably contains a styrene-based elastomer. The styrene-based elastomer is not particularly limited. The styrene-based elastomer is preferably a styrene block copolymer. Specific examples of the styrene-based elastomer include, for example, styrene-isobutylene block copolymer, styrene-butadiene block copolymer, styrene-isoprene block copolymer, styrene-isobutylene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene block copolymer, styrene-ethylene-propylene block copolymer, styrene-ethylene-ethylene-propylene block copolymer, and styrene-butadiene-butene-styrene block copolymer, etc. It is preferably at least one styrene-based elastomer selected from the group consisting of. The styrene-based elastomer may be used alone or in combination of two or more.

[0058] The content of the styrene-based polymer is preferably 20% by mass or more, more preferably 23% by mass or more, and even more preferably 25% by mass or more with respect to the whole (100% by mass) of the styrene-based hot melt adhesive composition. The content of the styrene-based polymer is preferably 55% by mass or less, more preferably 53% by mass or less, and even more preferably 50% by mass or less with respect to the whole (100% by mass) of the styrene-based hot melt adhesive composition.

[0059] The tackifier is not particularly limited. As the tackifier, the adhesive composition described in the above-mentioned olefin-based adhesive composition can be used.

[0060] The content of the tackifier is preferably 20% by mass or more, more preferably 23% by mass or more, and even more preferably 25% by mass or more with respect to the whole styrenic hot-melt adhesive composition (100% by mass). The content of the tackifier is preferably 70% by mass or less, more preferably 68% by mass or less, and even more preferably 65% by mass or less with respect to the whole styrenic hot-melt adhesive composition (100% by mass).

[0061] The plasticizer is not particularly limited. As the plasticizer, the adhesive composition described in the above olefinic adhesive composition can be used.

[0062] The content of the plasticizer is preferably 5% by mass or more, more preferably 8% by mass or more, and even more preferably 10% by mass or more with respect to the whole styrenic hot-melt adhesive composition (100% by mass). The content of the plasticizer is preferably 40% by mass or less, more preferably 38% by mass or less, and even more preferably 35% by mass or less with respect to the whole styrenic hot-melt adhesive composition (100% by mass).

[0063] The olefinic hot-melt adhesive composition and the styrenic hot-melt adhesive composition may contain various additives such as antioxidants, ultraviolet absorbers, light stabilizers, and colorants as necessary, as long as an oiling-treated adhesive label having a high oiling rate and a small amount of acid components contained in the produced oil can be obtained.

[0064] <Configuration of the oiling-treated adhesive label> From the viewpoint of improving recyclability, the oiling-treated adhesive label according to this embodiment is preferably made of a single material. When the oiling-treated adhesive label is made of a single material, it is easier to obtain an oiling-treated adhesive label having a higher oiling rate and a smaller amount of acid components contained in the produced oil.

[0065] In this specification, "monomaterialization" means that the base material and the adhesive layer are composed of the same type of material. When the oiling-treated adhesive label according to this embodiment is monomaterialized, it is only necessary that the same type of material is used for the base material and the adhesive layer, and it is not necessary that the same material is used.

[0066] In the oiling-treated adhesive label according to this embodiment, from the viewpoint of monomaterialization, it is preferable that the resin contained in the base material is a polyolefin-based resin and the hot melt adhesive composition is an olefin-based hot melt adhesive composition in the combination of the base material and the adhesive layer. From the same viewpoint, it is also preferable that the resin contained in the base material is a styrene-based resin and the hot melt adhesive composition is a styrene-based hot melt adhesive composition in the combination of the base material and the adhesive layer.

[0067] In the oiling-treated adhesive label according to this embodiment, from the viewpoint of easily obtaining an oiling-treated adhesive label having a higher oiling rate and less acid components contained in the produced oil, it is preferable that the base material and the adhesive layer are in direct contact.

[0068] The thickness of the adhesive layer is not particularly limited. For example, the thickness of the adhesive layer may be 1 μm or more and 100 μm or less. The thickness of the adhesive layer is preferably 5 μm or more, more preferably 10 μm or more. The thickness of the adhesive layer is preferably 80 μm or less, more preferably 50 μm or less.

[0069] <Release Sheet> The oiling-treated pressure-sensitive adhesive label according to this embodiment may be attached to a release sheet in order to protect the adhesive layer until it is used. The release sheet is a member provided as necessary. As the release sheet, a known release sheet is used. The release sheet includes release paper. The release sheet preferably has a release agent layer on one surface of a release base material, for example. The release agent layer can be formed from a release agent composition. The release base material is not particularly limited. Specifically, the release base material includes, for example, polyester films such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyolefin films such as polyethylene, polypropylene, and polymethylpentene; paper base materials such as clay-coated paper, glassine paper, kraft paper, fine paper, and recycled paper; and laminated papers obtained by laminating a thermoplastic resin such as polyethylene on a paper base material. The release agent composition is not particularly limited, and examples thereof include a release agent composition containing at least one release agent selected from the group consisting of silicone resins, alkyd resins, long-chain alkyl resins, fluorine resins, and waxes.

[0070] <Properties of the oiling-treated pressure-sensitive adhesive label> Next, the properties of the oiling-treated pressure-sensitive adhesive label according to this embodiment will be described.

[0071] (Oiling rate) In the oiling-treated pressure-sensitive adhesive label according to this embodiment, the oiling rate obtained by the following formula (Formula 1) is 60% by mass or more. The oiling rate is preferably 63% by mass or more, more preferably 65% by mass or more, further preferably 68% by mass or more, still further preferably 70% by mass or more, and even more preferably 75% by mass or more. The oiling rate is preferably closer to 100% by mass. Considering the case where residues are generated, the oiling rate may be 99% by mass or less. RO = (PW / AW) × 100 ··· (Formula 1) (In Formula (Formula 1), RO represents the oiling rate, PW represents the mass of the produced oil obtained by subjecting the oiling-treated pressure-sensitive adhesive label to an oiling treatment, and AW represents the mass of the oiling-treated pressure-sensitive adhesive label subjected to the oiling treatment.)

[0072] In the oil conversion-treated pressure-sensitive adhesive label according to this embodiment, the oil conversion rate excluding residues is preferably 80% by mass or more. The oil conversion rate excluding residues is determined by the following mathematical formula (Formula 2). RO = (PW / (AW - RW)) × 100 ···(Formula 2) (In the mathematical formula (Formula 2), RO represents the oil conversion rate, PW represents the mass of the produced oil obtained by subjecting the oil conversion-treated pressure-sensitive adhesive label to an oil conversion treatment, AW represents the mass of the oil conversion-treated pressure-sensitive adhesive label subjected to the oil conversion treatment, and RW represents the mass of the residue.)

[0073] The oil conversion rate of the oil conversion-treated pressure-sensitive adhesive label according to this embodiment is preferably, for example, the oil conversion rate when it is subjected to an oil conversion treatment by the oil conversion treatment method described in the third embodiment below. The produced oil obtained by subjecting the oil conversion-treated pressure-sensitive adhesive label according to this embodiment to an oil conversion treatment preferably exhibits the following characteristics.

[0074] <Characteristics of the produced oil obtained from the oil conversion-treated pressure-sensitive adhesive label> (Sulfur component) In the oil conversion-treated pressure-sensitive adhesive label according to this embodiment, the sulfur component of the produced oil generated by the oil conversion treatment for cooling the decomposition gas generated by thermal decomposition is preferably 0.05% by mass or less in the analysis conforming to JIS K2541-3:2003. If the sulfur component of the produced oil generated by the oil conversion treatment is 0.05% by mass or less in the analysis conforming to JIS K2541-3:2003, it becomes easier to use the produced oil as naphtha.

[0075] (Acid component) In the oil conversion-treated pressure-sensitive adhesive label according to the present embodiment, the acid component contained in the produced oil generated by the oil conversion treatment for cooling the decomposition gas generated by pyrolysis is small. When the acid component contained in the produced oil generated by the oil conversion treatment is small, corrosion of metal members or the like in contact with the produced oil is suppressed when the produced oil is used. The acid component contained in the produced oil can be confirmed, for example, by measuring the pH of the washing water after washing the produced oil with water. The water used for washing the produced oil is preferably close to neutral. Examples of the water used for washing the produced oil include ion-exchanged water, distilled water, and purified water. If the pH of the washing water after washing the produced oil with water is less than 4, it can be determined that the acid component contained in the produced oil is large, and if it is 4 or more, it can be determined that the acid component contained in the produced oil is small. The pH of the washing water after washing the produced oil with water is preferably in the range of 4 or more and 8 or less, more preferably in the range of 4.5 or more and 8 or less, and even more preferably in the range of 5 or more and 7.8 or less. Specifically, the pH of the washing water after washing the produced oil with water can be measured by the method described in the examples below. When the pH of the washing water after washing the produced oil with water is less than 4, it is considered that the corrosion rate of metal members or the like when the produced oil comes into contact is likely to increase compared to the case where the pH is 4 or more.

[0076] <Method for manufacturing oil conversion-treated pressure-sensitive adhesive label> The oiling-treated pressure-sensitive adhesive label according to this embodiment is obtained by a manufacturing method including: a step of preparing a base material containing at least one resin selected from the group consisting of polyolefin-based resins and styrene-based resins and containing an inorganic filler at 30% by mass or less, or not containing the inorganic filler; and a step of providing an adhesive layer formed from at least one hot-melt pressure-sensitive adhesive composition selected from the group consisting of olefin-based hot-melt pressure-sensitive adhesive compositions and styrene-based hot-melt pressure-sensitive adhesive compositions on one surface of the base material. The step of providing the adhesive layer on the base material can, for example, form the adhesive layer by melt-coating the above-mentioned hot-melt pressure-sensitive adhesive composition on the above-mentioned base material. In addition, in the step of providing the above-mentioned hot-melt pressure-sensitive adhesive layer on the above-mentioned base material, first, a release sheet is prepared. Next, after melt-coating a hot-melt pressure-sensitive adhesive composition on the releasable surface (release-treated surface) of the release sheet to form an adhesive layer, the base material is laminated on the adhesive layer to transfer the adhesive layer to the base material. Even by such a process, the above-mentioned hot-melt pressure-sensitive adhesive layer can be formed on the above-mentioned base material. The heating temperature during melt-coating is not particularly limited as long as the effects of the present invention are not impaired, but is preferably 130°C or higher and 200°C or lower, more preferably 150°C or higher and 190°C or lower.

[0077] The method of melt-coating the pressure-sensitive adhesive composition is not particularly limited, and for example, known methods such as spray coating method, bar coating method, knife coating method, air knife coating method, roll knife coating method, roll coating method, blade coating method, die coating method, gravure coating method, lip coating method, curtain coating method, dip coating method, and squeeze coating method can be adopted.

[0078] When the oiling-treated pressure-sensitive adhesive label includes a release sheet, it becomes an oiling-treated pressure-sensitive adhesive label sheet having the oiling-treated pressure-sensitive adhesive label. In this case, it may have a step of punching the oiling-treated pressure-sensitive adhesive label sheet. By this step, the oiling-treated pressure-sensitive adhesive label portion can be partitioned. Also, by this step, the oiling-treated pressure-sensitive adhesive label portion and the unnecessary portion can be partitioned.

[0079] The planar shape of the label may be circular, elliptical, rectangular, polygonal, or a combination thereof. The planar shape of the label may be formed according to the purpose.

[0080] [Container with Oil-Resistant Adhesive Label] The second embodiment of the present invention is a container with an oil-resistant adhesive label. Hereinafter, a preferred example of this embodiment will be described.

[0081] The container with an oil-resistant adhesive label according to this embodiment includes a container containing at least one resin selected from the group consisting of polyolefin resins and styrene resins, and an oil-resistant adhesive label according to the first embodiment affixed to the surface of the container. Since the container with an oil-resistant adhesive label according to this embodiment is a container with an oil-resistant adhesive label provided with the oil-resistant adhesive label according to the first embodiment, it is possible to perform the oil-resistant treatment on the entire container without removing the oil-resistant adhesive label.

[0082] [Container] In this embodiment, an oil-resistant adhesive label according to the first embodiment is affixed to the surface of the container. In the container with an oil-resistant adhesive label according to this embodiment, the container may have a container body and a lid, or may have only the container body. When the container has a lid, the container includes a container body for containing the contents and a lid that can be attached to the container body to seal the container body. When the container includes a container body and a lid, the oil-resistant adhesive label according to the first embodiment is affixed to at least one of the lid and the container body. When the container includes a container body and a lid, the lid contains at least one resin selected from the group consisting of polyolefin resins and styrene resins, and the container body also contains at least one resin selected from the group consisting of polyolefin resins and styrene resins.

[0083] The shape of the container body is not particularly limited. Examples of the shape of the container body include shapes suitable for the contents to be contained in container bodies such as tubular, cup-shaped, tray-shaped, pack-shaped, pouch-shaped, box-shaped, and bottle-shaped. When the container includes a lid and a container body, the cross-sectional shape when the container body is viewed in plan from the opening side may be, for example, any shape such as circular, elliptical, and rectangular, or a combination of these shapes. When the cross-sectional shape is rectangular, the corners of the rectangle may have rounded edges. The lid may have a shape that conforms to the shape of the opening of the container body.

[0084] The container body and the lid may each be a molded body formed by various molding methods such as compression molding, extrusion molding, injection molding, blow molding, and thermoforming. The material, shape, molding method, etc. of the container body may be determined by the contents to be contained in the container body. The material, shape, molding method, etc. of the lid may be determined according to the form of sealing the container body. The lid may be, for example, a film-shaped molded body or a block-shaped molded body.

[0085] From the viewpoint of improving recyclability, the container with an oiling-treated adhesive label according to the present embodiment is preferably made of a single material. When the container with an oiling-treated adhesive label is made of a single material, it is easier to obtain a container with an oiling-treated adhesive label having a higher oiling rate and less acid components contained in the produced oil.

[0086] In the container with an oiling-treated adhesive label according to the present embodiment, from the viewpoint of single-materialization, it is preferable that the resin contained in the container is a polyolefin-based resin, and the oiling-treated adhesive label attached to the surface of the container includes a base material containing a polyolefin-based resin and an adhesive layer provided on one surface of the base material and formed from an olefin-based hot-melt adhesive composition. From the same perspective, in the combination of an oil-treated pressure-sensitive adhesive label and a container, it is also preferable that the resin contained in the container is a styrene-based resin, and the oil-treated pressure-sensitive adhesive label attached to the surface of the container includes a base material containing a styrene-based resin and an adhesive layer provided on one surface of the base material and formed from a styrene-based hot-melt pressure-sensitive adhesive composition.

[0087] The container with an oil-treated pressure-sensitive adhesive label according to this embodiment is obtained by attaching the adhesive layer of the oil-treated pressure-sensitive adhesive label toward the surface of the container so that the oil-treated pressure-sensitive adhesive label is fixed to the container. When the oil-treated pressure-sensitive adhesive label according to the first embodiment is attached to a release sheet, the adhesive layer of the oil-treated pressure-sensitive adhesive label is exposed by separating the oil-treated pressure-sensitive adhesive label from the release sheet. Then, the exposed adhesive layer is attached toward the container, whereby the oil-treated pressure-sensitive adhesive label is fixed to the container body.

[0088] Here, the container with an oil-treated pressure-sensitive adhesive label according to this embodiment will be described with reference to the drawings. In the drawings, there are parts shown enlarged or reduced for ease of explanation.

[0089] The schematic diagram shown in FIG. 3 represents an example of a container with an oil-treated adhesive label according to the present embodiment. As shown in FIG. 3, the container 300 with an oil-treated adhesive label includes a container 200 and oil-treated adhesive labels 100A and 100B attached to the surface of the container 200. In FIG. 3, the container 200 has a bottle-like shape. The container 200 includes a hollow container body 201 and a lid 202 detachably attached to the container body 201. The container body 201 has a mouth portion 201A having an opening, a shoulder portion 201B connected to the mouth portion 201A, a body portion 201C connected to the shoulder portion 201B, and a bottom portion 201D closing the bottom surface of the body portion 201C. When the container 200 is viewed in plan from the lid 202 side, both the shape of the container body 201 and the shape of the lid 202 are substantially circular. The interior of the container body 201 contains the contents. The lid 202 is attached to the mouth portion 201A and is configured to seal the container body 201 by the lid 202. The oil-treated adhesive label 100A has a rectangular shape, and the longitudinal direction of the oil-treated adhesive label 100A is attached along the circumferential direction of the outer peripheral surface of the body portion 201C. The planar shape of the oil-treated adhesive label 100B is circular and is attached to the surface of the top of the lid 202. The oil-treated adhesive labels 100A and 100B are each attached to the surface of the container with the entire adhesive surface of the adhesive layer.

[0090] The container body 201 contains at least one resin selected from the group consisting of polyolefin resins and styrene resins. The lid 202 also contains at least one resin selected from the group consisting of polyolefin resins and styrene resins. The oil-treated pressure-sensitive labels 100A and 100B have the same configuration as the oil-treated pressure-sensitive labels described in the first embodiment. That is, the base materials (not shown) of the oil-treated pressure-sensitive labels 100A and 100B contain at least one resin selected from the group consisting of polyolefin resins and styrene resins, and the adhesive layer (not shown) is formed from a hot-melt adhesive composition that is at least one selected from the group consisting of olefin-based hot-melt adhesive compositions and styrene-based hot-melt adhesive compositions. In the container 300 with an oil-treated pressure-sensitive label, a printing layer (not shown) according to the purpose is formed on the outer surface of the base materials (not shown) of the oil-treated pressure-sensitive labels 100A and 100B.

[0091] As described above, with reference to FIG. 3, an example of the container with an oil-treated pressure-sensitive label according to this embodiment has been described. However, the container with an oil-treated pressure-sensitive label according to this embodiment is not limited to this. The container with an oil-treated pressure-sensitive label according to this embodiment can adopt various forms as long as it has the above specific container and the oil-treated pressure-sensitive label having the above specific base material and specific adhesive layer. For example, in the container 300 with an oil-treated pressure-sensitive label, although a bottle-shaped container body has been described as an example, it is not limited to this, and various shapes may be used. Also, in the container 300 with an oil-treated pressure-sensitive label, although the configuration of the container 200 in which the lid 202 is detachable from the container body 201 has been described, it is not limited to this. For example, the configuration of a container in which the lid is heat-sealed to a container body such as a cup shape may be used. Also, in FIG. 3, the form having a lid and a container body has been described. However, for example, a container may be configured only with a container body such as a box shape without a lid. Furthermore, in FIG. 3, the oil-treated pressure-sensitive labels 100A and 100B are attached to the surface of the container 200. However, either one of the oil-treated pressure-sensitive labels 100A and 100B may be attached. Furthermore, in FIG. 3, the form in which the entire adhesive surface in the adhesive layer of the oil-treated adhesive label is attached to the surface of the container has been described, but a form in which a part of the adhesive surface is attached to the surface of the container may also be used. In this case, for example, a form in which it is attached in a floating state from the surface of the container can also be cited.

[0092] The container with an oil-treated adhesive label according to the present embodiment is preferably oil-treated by, for example, the oil treatment method described in the fourth embodiment below. The produced oil obtained by oil-treating the container with an oil-treated adhesive label according to the present embodiment preferably exhibits the following characteristics.

[0093] In the container with an oil-treated adhesive label according to the present embodiment, the oil conversion rate obtained by the above-mentioned formula (Formula 1) is preferably 60% by mass or more. The oil conversion rate is preferably 63% by mass or more, more preferably 65% by mass or more, further preferably 68% by mass or more, even more preferably 70% by mass or more, and even more preferably 75% by mass or more. The oil conversion rate is preferably closer to 100% by mass. Considering the case where residues are generated, the oil conversion rate may be 99% by mass or less.

[0094] In the container with an oil-treated adhesive label according to the present embodiment, it is preferable that the sulfur component of the produced oil obtained by the oil treatment and the acid component contained in the produced oil are small. For example, in the container with an oil-treated adhesive label according to the present embodiment, in the analysis conforming to JIS K2541-3:2003, the sulfur component of the produced oil generated by the oil treatment for cooling the decomposition gas generated by thermal decomposition is preferably 0.05% by mass or less. If the sulfur component of the produced oil is 0.05% by mass or less in the analysis conforming to JIS K2541-3:2003, it becomes easy to use the produced oil as naphtha. Further, for example, in the container with an oil conversion-treated adhesive label according to the present embodiment, the pH of the washing water after washing the produced oil generated by the oil conversion treatment for cooling the decomposition gas generated by pyrolysis with water is preferably in the range of 4 or more and 8 or less, more preferably in the range of 4.5 or more and 8 or less, and even more preferably in the range of 5 or more and 7.8 or less. When the pH of the washing water after washing the produced oil with water is within the above range, corrosion of metal members and the like contacted by the produced oil is likely to be suppressed when the produced oil is used.

[0095] [Method for Oil Conversion Treatment of Oil Conversion-Treated Adhesive Label] The third embodiment of the present invention is a method for oil conversion treatment of an oil conversion-treated adhesive label. Hereinafter, a preferred example of this embodiment will be described.

[0096] The method for oil conversion treatment of the oil conversion-treated adhesive label according to the present embodiment includes a step of preparing an oil conversion-treated adhesive label, a step of heating and pyrolyzing the prepared oil conversion-treated adhesive label, and a step of cooling the decomposition gas generated by the pyrolysis to obtain a produced oil. The oil conversion-treated adhesive label is the oil conversion-treated adhesive label described in the first embodiment.

[0097] Here, the method for oil conversion treatment of the oil conversion-treated adhesive label according to the present embodiment will be described with reference to FIGS. 4 and 5.

[0098] FIG. 4 shows a schematic diagram for explaining an example of an oil conversion treatment apparatus. In FIG. 4, for ease of explanation, it is shown in a simplified manner. The oil conversion treatment apparatus shown in FIG. 4 is an example of an oil conversion treatment apparatus applicable to the method for oil conversion treatment of the oil conversion-treated adhesive label according to the present embodiment. FIG. 5 shows a flowchart representing the steps in the method for oil conversion treatment of the oil conversion-treated adhesive label according to the present embodiment. For example, in one aspect of the method for oil conversion treatment of the oil conversion-treated adhesive label according to the present embodiment, each step in the flowchart shown in FIG. 5 can be realized by the oil conversion treatment apparatus shown in FIG. 4.

[0099] As shown in FIG. 4, the oilification treatment apparatus 500 includes a pyrolysis unit 501 that heats and pyrolyzes the oilified treatment adhesive label, a cooling unit 502 that cools the pyrolysis gas generated by pyrolysis, and a product oil collection unit 503 that collects the product oil obtained by cooling the pyrolysis gas. In one aspect, the pyrolysis unit 501 may include pyrolysis means such as a pyrolysis furnace (not shown) and a heat source such as a heater that supplies heat to the pyrolysis means (not shown). In the pyrolysis unit 501, when a heat source is provided, the heat source may be mounted, for example, on at least one of the inside and outside of the pyrolysis means, and the pyrolysis means and the heat source may be provided individually. In one aspect, the pyrolysis unit 501 may include stirring means (not shown) for stirring the oilified treatment adhesive label housed inside the pyrolysis unit 501. In one aspect, the pyrolysis unit 501 may include rotating means (not shown) for rotating the pyrolysis means. The cooling unit 502 may be configured by known cooling means and a refrigerant in one aspect. The product oil collection unit 503 may be configured by known product oil collection means in one aspect.

[0100] In one aspect, the oilification treatment apparatus 500 may include a supply unit (not shown) that supplies the oilified treatment adhesive label to the pyrolysis unit 501. The supply unit may employ known supply means. The supply unit may include crushing means for crushing the oilified treatment adhesive label and cleaning means for cleaning the oilified treatment adhesive label. In one aspect, the oilification treatment apparatus 500 may include a residue collection unit (not shown) that collects the residue generated during the pyrolysis treatment. The residue collection unit may employ known residue collection means. In one aspect, the oilification treatment apparatus 500 may include an off-gas treatment unit (not shown) that treats the off-gas that does not become product oil when the pyrolysis gas is cooled in the cooling unit 502. The off-gas treatment unit may employ known off-gas treatment means.

[0101] As shown in FIG. 5, the oiling treatment method of the oiling treatment adhesive label includes steps of preparing the oiling treatment adhesive label (step S101), pyrolyzing the oiling treatment adhesive label (step S102), and generating produced oil (step S103). That is, after the prepared oiling treatment adhesive label is supplied to the pyrolysis unit 501 in the oiling treatment apparatus 500 shown in FIG. 4, step S102 is performed in the pyrolysis unit 501, the decomposition gas generated by pyrolysis is supplied to the cooling unit 502, step S103 is performed in the cooling unit 502, and the produced oil liquefied by cooling the decomposition gas is supplied to the produced oil collection unit 503 to collect the produced oil.

[0102] <Step S101> Step S101 is a step of preparing the oiling treatment adhesive label. In step S101, in order to be subjected to the oiling treatment, the oiling treatment adhesive label according to the present embodiment is prepared. The oiling treatment adhesive label to be subjected to the oiling treatment is prepared as an oiling treatment adhesive label scheduled for disposal. The oiling treatment adhesive label scheduled for disposal is substantially waste of the oiling treatment adhesive label. The oiling treatment adhesive label to be subjected to the oiling treatment may be a used oiling treatment adhesive label or an unused oiling treatment adhesive label as long as it is an oiling treatment adhesive label scheduled for disposal. The prepared oiling treatment adhesive label is supplied to step S102 of the next step. The prepared oiling treatment adhesive label is housed inside the pyrolysis means in the pyrolysis unit 501 shown in FIG. 4.

[0103] <Step S102> Step S102 is a step of pyrolyzing the prepared oil-treated adhesive label. The temperature at which the oil-treated adhesive label accommodated inside the pyrolysis means in the pyrolysis unit 501 shown in FIG. 4 is pyrolyzed is not particularly limited as long as it is a temperature at which the oil-treated adhesive label can be pyrolyzed. The pyrolysis conditions may be set according to the material of the oil-treated adhesive label and the like. The pyrolysis temperature may be, for example, 340 °C or higher, 360 °C or higher, 380 °C or higher, or 400 °C or higher. The pyrolysis temperature may be, for example, 500 °C or lower, 480 °C or lower, 460 °C or lower, or 440 °C or lower. The pyrolysis time is not particularly limited as long as it is a time at which the oil-treated adhesive label can be pyrolyzed. The pyrolysis time may be, for example, 1 hour or longer, 2 hours or longer, or 3 hours or longer. The pyrolysis time may be, for example, 15 hours or shorter, 10 hours or shorter, or 7 hours or shorter. The pyrolysis may be carried out under reduced pressure, under increased pressure, or under normal pressure. From the viewpoint of sufficiently collecting the generated oil, the pyrolysis is preferably carried out in an oxygen-free environment. Here, the oxygen-free environment means an oxygen-free gas atmosphere, and the oxygen-free gas means a gas other than oxygen and oxides. The oxygen-free gas can include, for example, inert gases such as nitrogen and argon, and hydrocarbon gases such as methane and ethane. The oxygen-free gas is preferably an inert gas. The decomposition gas generated by the pyrolysis is supplied to the next step, step S103, and is cooled in the cooling unit 502 shown in FIG. 4.

[0104] <Step S103> Step S103 is a step of obtaining a product oil by cooling the pyrolysis gas generated by pyrolysis in Step S102. The pyrolysis gas obtained by pyrolyzing the oil-treated adhesive label is cooled to generate a liquefied product oil and a non-liquefied gaseous off-gas. The cooling temperature of the pyrolysis gas in the cooling unit 502 shown in FIG. 4 is not particularly limited as long as it is a temperature at which the product oil is generated. The cooling temperature of the pyrolysis gas may be, for example, 20°C or higher, or 30°C or higher. The cooling temperature of the pyrolysis gas may be, for example, 60°C or lower, or 50°C or lower. The liquefied product oil is supplied to the product oil collection unit 503 shown in FIG. 4, and the product oil is collected.

[0105] As described above, with reference to FIGS. 4 and 5, the oil treatment method of the oil-treated adhesive label according to the present embodiment has been described. However, the oil treatment method of the oil-treated adhesive label according to the present embodiment is not limited thereto. The oil treatment method of the oil-treated adhesive label according to the present embodiment can be performed by a known oil treatment apparatus.

[0106] By the oil treatment method of the oil-treated adhesive label according to the present embodiment, the oil conversion rate described in the first embodiment can be obtained. Further, as described in the first embodiment, the product oil obtained by the oil treatment method of the oil-treated adhesive label according to the present embodiment contains less sulfur component in the product oil, and the pH of the washing water after washing the product oil with water can satisfy the range of 4 or more and 8 or less.

[0107] [Oil treatment method for a container with an oil-treated adhesive label] The fourth embodiment of the present invention is an oil treatment method for a container with an oil-treated adhesive label. Hereinafter, a preferred example of the present embodiment will be described.

[0108] The oil conversion treatment method for a container with an oil conversion treatment adhesive label according to this embodiment includes a step of preparing a container with an oil conversion treatment adhesive label including at least one resin selected from the group consisting of polyolefin resins and styrene resins, and an oil conversion treatment adhesive label attached to the surface of the container, a step of heating and thermally decomposing the prepared container with the oil conversion treatment adhesive label, and a step of cooling the pyrolysis gas generated by the thermal decomposition to obtain a produced oil. The oil conversion treatment adhesive label is the oil conversion treatment adhesive label according to the first embodiment.

[0109] Here, the oil conversion treatment method for a container with an oil conversion treatment adhesive label according to this embodiment will be described with reference to FIGS. 4 and 6. FIG. 4 shows an example of an oil conversion treatment apparatus, and the oil conversion treatment apparatus shown in FIG. 4 is also an example of an oil conversion treatment apparatus applicable to the oil conversion treatment method for a container with an oil conversion treatment adhesive label according to this embodiment. The details of the oil conversion treatment apparatus shown in FIG. 4 are as described in the above-mentioned third embodiment. FIG. 6 shows a flowchart representing the steps in the oil conversion treatment method for a container with an oil conversion treatment adhesive label according to this embodiment. The oil conversion treatment method for a container with an oil conversion treatment adhesive label according to this embodiment can realize each step in the flowchart shown in FIG. 6 by the oil conversion treatment apparatus shown in FIG. 4 described in the third embodiment.

[0110] As shown in FIG. 6, the oil conversion treatment method for a container with an oil conversion treatment adhesive label includes steps of preparing the container with the oil conversion treatment adhesive label (step S201), thermally decomposing the container with the oil conversion treatment adhesive label (step S202), and generating the produced oil (step S203).

[0111] <Step S201> Step S201 is a step of preparing an oil-treated adhesive label-attached container. The oil-treated adhesive label-attached container prepared in step S201 is an oil-treated adhesive label-attached container scheduled to be discarded. The oil-treated adhesive label-attached container scheduled to be discarded is substantially waste of the oil-treated adhesive label-attached container. The prepared oil-treated adhesive label-attached container may be supplied to step S202 of the next process after being pulverized, or may be supplied to step S202 of the next process in its original form without being pulverized. The prepared oil-treated adhesive label-attached container is housed inside the pyrolysis means in the pyrolysis unit 501 shown in FIG. 4.

[0112] <Step S202> Step S202 is a step of pyrolyzing the prepared oil-treated adhesive label-attached container. The oil-treated adhesive label-attached container housed inside the pyrolysis means in the pyrolysis unit 501 shown in FIG. 4 is pyrolyzed. The pyrolysis conditions when the oil-treated adhesive label-attached container is pyrolyzed may be set according to the material and form of the oil-treated adhesive label-attached container. As one aspect, the pyrolysis conditions can adopt the same conditions as the pyrolysis conditions described in the third embodiment. The decomposition gas generated by pyrolysis is supplied to step S203 of the next process. The decomposition gas generated by pyrolysis is cooled in the cooling unit 502 shown in FIG. 4.

[0113] <Step S203> Step S203 is a step of obtaining produced oil by cooling the decomposition gas generated by pyrolysis in step S202. Similar to the third embodiment, the decomposition gas obtained by pyrolyzing the oil-treated adhesive label-attached container produces produced oil liquefied by cooling and off-gas of gas that is not liquefied. As one aspect, the cooling conditions for the decomposition gas in the cooling unit 502 shown in FIG. 4 can adopt the same conditions as the cooling temperature described in the third embodiment. The liquefied produced oil is supplied to the produced oil collection unit 503 shown in FIG. 4, and the produced oil is collected.

[0114] As described above, with reference to FIGS. 4 and 6, the oiling treatment method for an oiled treatment adhesive label-attached container according to the present embodiment has been described. However, the oiling treatment method for an oiled treatment adhesive label-attached container according to the present embodiment is not limited thereto. The oiling treatment method for an oiled treatment adhesive label-attached container according to the present embodiment can be performed by a known oiling treatment apparatus.

[0115] By the oiling treatment method for an oiled treatment adhesive label-attached container according to the present embodiment, the oiling rate described in the second embodiment is easily obtained. Further, as described in the second embodiment, the produced oil obtained by the oiling treatment method for an oiled treatment adhesive label-attached container according to the present embodiment tends to have less sulfur components contained in the produced oil, and the pH of the washing water after washing the produced oil with water easily satisfies the range of 4 or more and 8 or less.

[0116] The present invention is not limited to the above-described embodiments. The present invention can include modifications and improvements within the range that can achieve the object of the present invention.

Example

[0117] Examples will be described below, but the present invention is not limited to these examples at all.

[0118] As materials for producing the oiled treatment adhesive labels of each example and comparative example, the following raw materials were prepared.

[0119] [Base material] 「PO-1」: White polypropylene film (thickness 80 μm, containing 30% by mass of inorganic filler) 「PO-2」: Transparent biaxially oriented polypropylene (thickness 50 μm, no inorganic filler contained)

[0120] [Adhesive layer] <Styrene-based polymer> 「TPS-1」: Styrene-based elastomer (styrene-butadiene-styrene block copolymer, manufactured by Asahi Kasei Corporation, "[Asapren (registered trademark) T] series") 「TPS-2」: Styrenic elastomer (styrene-isoprene-styrene block copolymer, manufactured by Nippon Zeon Co., Ltd., "[Quintac (registered trademark)] series")

[0121] <Olefin-based polymer> 「POE-1」: Olefinic elastomer (ethylene-α olefin copolymer, manufactured by Sumitomo Chemical Co., Ltd., "[Exxelor (registered trademark) VL / FX] series")

[0122] <Acrylic adhesive> 「Ac-1」: Acrylic emulsion (manufactured by Toagosei Co., Ltd., "HV-C9500")

[0123] <Adhesion promoter> 「TF-1」: Hydrogenated petroleum resin (manufactured by Arakawa Chemical Industries, Ltd., "[Alcon] series") 「TF-2」: Rosin resin (manufactured by Kraton, "[SYLVALITE] series")

[0124] <Plasticizer> 「Oil-1」: Process oil (manufactured by Idemitsu Kosan Co., Ltd., "Diana Freshia")

[0125] [Preparation of oil-treated adhesive label] <Example 1> In terms of solid content, 30 parts by mass of styrenic elastomer (TPS-1) as the base polymer, 25 parts by mass of hydrogenated petroleum resin (TF-1) as the adhesion promoter, 25 parts by mass of rosin resin (TF-2), and 20 parts by mass of process oil (Oil-1) as the plasticizer were blended to obtain a styrenic hot melt adhesive composition. The total of the adhesive, adhesion promoter, and plasticizer in the styrenic hot melt adhesive composition is 100 parts by mass. The styrenic hot melt adhesive composition obtained above was melt-coated on a white PP film (PO-1) as the substrate to a thickness of 15 μm to form a coating film. By cooling the coating film, an oil-treated adhesive label with an adhesive layer formed on one side of the substrate was obtained.

[0126] <Examples 2 to 6> According to Table 1, an oiled pressure-sensitive adhesive label was obtained in the same manner as in Example 1, except that at least one of the conditions of the type of substrate, the type of base polymer, the type and composition of the tackifier, and the thickness of the pressure-sensitive adhesive layer was changed.

[0127] <Comparative Example 1> In terms of solid content, 90 parts by mass of an acrylic emulsion (Ac-1) as a pressure-sensitive adhesive, 5 parts by mass of a hydrogenated petroleum resin (TF-1) as a tackifier, and 5 parts by mass of a rosin resin (TF-2) were blended to obtain an acrylic pressure-sensitive adhesive composition. The total of the pressure-sensitive adhesive and the tackifier in the acrylic pressure-sensitive adhesive composition is 100 parts by mass. An oiled pressure-sensitive adhesive label was obtained in the same manner as in Example 1, except that the obtained acrylic pressure-sensitive adhesive composition was used. In Table 1, the acrylic pressure-sensitive adhesive is also described in the base polymer column.

[0128] [Oiling treatment test of oiled pressure-sensitive adhesive label] An oiling treatment test of the oiled pressure-sensitive adhesive label was carried out using an oiling treatment test apparatus. The oiling treatment test apparatus includes a pyrolysis vessel equipped with a heater, a cooler connected to the pyrolysis vessel and provided with a circulation pipeline for cooling water, and a product oil collector connected to the cooler. The oiling treatment test apparatus is configured to be able to pyrolyze by heating the pyrolysis vessel, to be able to cool by passing cooling water through the circulation pipeline, and to be able to collect and store the product oil generated by cooling in the product oil collector.

[0129] [Measurement of oiling rate] First, 350 g of oil-treated pressure-sensitive adhesive labels prepared in each example were prepared, and the prepared oil-treated pressure-sensitive adhesive labels were placed inside the pyrolysis vessel in the oil treatment test apparatus. Next, the flow of cooling water was started inside the cooler so that the pyrolysis gas could be cooled. Next, the inside of the pyrolysis vessel was replaced with nitrogen gas so that the environment would be an oxygen-free state. Then, the heating temperature was adjusted to be 400 °C or higher and 440 °C or lower, and pyrolysis was performed with a heating time of 3.5 hours. A part of the pyrolysis gas generated by pyrolysis was liquefied by being cooled in the cooler, and the liquefied produced oil was collected by a produced oil collector. The oil conversion rate was calculated according to the above-mentioned formula (Equation 1) from the amount of the oil-treated pressure-sensitive adhesive labels prepared for the oil treatment and the amount of the collected produced oil.

[0130] <pH of washing water> 100 ml of a part of the collected produced oil was put into a separating funnel with a volume of 500 ml, and 100 ml of purified water as washing water was put into the separating funnel. Then, after shaking vigorously for 3 minutes, it was left to stand for 10 minutes. Next, the aqueous layer was separated from the separating funnel, and the pH of the separated aqueous layer was measured with a pH meter (manufactured by Horiba, Ltd., "Monochromatic Desktop pH Meter"). The operation until the pH of this aqueous layer was measured was repeated 3 times, and the average value of the pH of the aqueous layer measured 3 times was taken as the pH of the washing water.

[0131] <Sulfur component> A part of the collected produced oil was sampled as an analytical sample, and the analytical sample was analyzed in accordance with JIS K2541-3:2003.

[0132]

Table 1

[0133]

Table 2

[0134] From the above results, it can be seen that the oiled adhesive labels of each example have a higher oiling rate when oiled compared to the oiled adhesive label of Comparative Example 1, and the acid components contained in the produced oil are less. Therefore, it was confirmed that when the oiled adhesive label according to this embodiment is oiled, an oiled adhesive label with a high oiling rate and few acid components contained in the produced oil can be obtained.

[0135] In Example 1, when assuming that the residue was only the inorganic filler, the oiling rate excluding the residue was 84.0%, exceeding 80%. On the other hand, in Comparative Example 1, when assuming that the residue was only the inorganic filler, the oiling rate excluding the residue was 77.2%. Therefore, it was confirmed that the oiling rate of the oiled adhesive label according to this embodiment is excellent compared to the comparative example. The oiling rate excluding the residue is obtained by the above formula (Formula 2).

[0136] Since the pH of the washing water after washing the produced oil obtained from the oiled adhesive label in each example with water is 4 or more, it is presumed that corrosion can be suppressed when the produced oil obtained from the oiled adhesive label produced in each example comes into contact with a metal member or the like. Furthermore, since the produced oil obtained from the oiled adhesive label of each example has a low sulfur component content, it can be used as naphtha. Therefore, the utilization of the produced oil obtained by oiling the oiled adhesive label according to this embodiment is useful as a fuel and useful as a monomer raw material.

Explanation of Reference Signs

[0137] 10…Base material, 11…First base material surface, 12…Second base material surface, 20…Adhesive layer, 21…First adhesive layer surface, 22…Second adhesive layer surface, 30…Release sheet, 32…Release treatment surface, 100, 100A, 100B…Oil-treated adhesive label, 101…Oil-treated adhesive label area, 101A…Oil-treated adhesive label part, 101X…Cut, 101Z…Unnecessary part, 110…Oil-treated adhesive label sheet, 200…Container, 201…Container body, 201A…Mouth part, 201B…Shoulder part, 201C…Barrel part, 201D…Bottom part, 202…Cover body, 300…Container with oil-treated adhesive label, 500…Oil treatment device, 501…Pyrolysis part, 502…Cooling part, 503…Product oil collection part.

Claims

1. An oil-recyclable pressure-sensitive adhesive label, comprising: a substrate containing at least one resin selected from the group consisting of polyolefin resins and styrene resins, and containing or not containing an inorganic filler; an adhesive layer provided on one surface of the substrate and formed from at least one hot-melt adhesive composition selected from the group consisting of olefin-based hot-melt adhesive compositions and styrene-based hot-melt adhesive compositions; and when the inorganic filler is contained in the substrate, the content is 30% by mass or less, the oil-recycling rate determined by the following formula (Formula 1) is 60% by mass or more, an oil-recyclable pressure-sensitive adhesive label. RO = (PW / AW) × 100... (Formula 1) (In Formula (Formula 1), RO represents the oil-recycling rate, PW represents the mass of the produced oil obtained by subjecting the oil-recyclable pressure-sensitive adhesive label to an oil-recycling treatment, and AW represents the mass of the oil-recyclable pressure-sensitive adhesive label subjected to the oil-recycling treatment.)

2. The oil-recyclable pressure-sensitive adhesive label according to Claim 1, wherein the olefin-based hot-melt adhesive composition contains an olefin-based elastomer, the styrene-based hot-melt adhesive composition contains a styrene-based elastomer, an oil-recyclable pressure-sensitive adhesive label.

3. The oil-recyclable pressure-sensitive adhesive label according to Claim 1, wherein the resin contained in the substrate is the polyolefin resin, the hot-melt adhesive composition is the olefin-based hot-melt adhesive composition, an oil-recyclable pressure-sensitive adhesive label.

4. The oil-recyclable pressure-sensitive adhesive label according to Claim 1, wherein the resin contained in the substrate is the styrene resin, the hot-melt adhesive composition is the styrene-based hot-melt adhesive composition, an oil-recyclable pressure-sensitive adhesive label.

5. The oil-recyclable pressure-sensitive adhesive label according to any one of Claims 1 to 4, wherein the hot-melt adhesive composition contains a tackifier, the tackifier contains at least one selected from the group consisting of aromatic petroleum resins, alicyclic petroleum resins, aliphatic petroleum resins, and aliphatic-aromatic copolymer petroleum resins, an oil-recyclable pressure-sensitive adhesive label.

6. A container with an oil-recyclable pressure-sensitive adhesive label, comprising the oil-recyclable pressure-sensitive adhesive label, a container containing at least one resin selected from the group consisting of polyolefin resins and styrene resins, and an oil-recyclable pressure-sensitive adhesive label affixed to the surface of the container, and The oil-treated pressure-sensitive label is the oil-treated pressure-sensitive label according to any one of claims 1 to 4. A container with an oil-treated pressure-sensitive label.

7. In the container with an oil-treated pressure-sensitive label according to claim 6, the resin contained in the container is the polyolefin resin, the oil-treated pressure-sensitive label attached to the surface of the container is an oil-treated pressure-sensitive label including a base material containing a polyolefin resin and an adhesive layer provided on one surface of the base material and formed from an olefin-based hot-melt adhesive composition. A container with an oil-treated pressure-sensitive label.

8. In the container with an oil-treated pressure-sensitive label according to claim 6, the resin contained in the container is the styrene resin, the oil-treated pressure-sensitive label attached to the surface of the container is an oil-treated pressure-sensitive label including a base material containing a styrene resin and an adhesive layer provided on one surface of the base material and formed from a styrene-based hot-melt adhesive composition. A container with an oil-treated pressure-sensitive label.

9. An oil treatment method for oil-treating an oil-treated pressure-sensitive label, comprising: a step of preparing an oil-treated pressure-sensitive label; a step of heating the prepared oil-treated pressure-sensitive label to thermally decompose it; a step of cooling the pyrolysis gas generated by the thermal decomposition to obtain a produced oil; having, the oil-treated pressure-sensitive label is the oil-treated pressure-sensitive label according to any one of claims 1 to 4. An oil treatment method for an oil-treated pressure-sensitive label.

10. An oil treatment method for oil-treating a container with an oil-treated pressure-sensitive label, comprising: a step of preparing a container with an oil-treated pressure-sensitive label including a container containing at least one resin selected from the group consisting of a polyolefin resin and a styrene resin and an oil-treated pressure-sensitive label attached to the surface of the container; a step of heating the prepared container with an oil-treated pressure-sensitive label to thermally decompose it; a step of cooling the pyrolysis gas generated by the thermal decomposition to obtain a produced oil; having, the oil-treated pressure-sensitive label is the oil-treated pressure-sensitive label according to any one of claims 1 to 4. An oil treatment method for a container with an oil-treated pressure-sensitive label.

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