Hot melt adhesives and containers

Abstract

To provide a hot melt adhesive that has high adhesive strength and resistance and followability (actual adhesion) to label displacement due to bottle expansion even when the hot melt adhesive is applied in a thin film, makes the label difficult to peel off, and can be separated from a PET bottle in a short time with a hot alkaline aqueous solution. [Solution] A hot melt adhesive comprising a styrene-based elastomer (A), a rosin-based tackifier (B) having an acid value of 100 to 350 mgKOH / g, and a polyoxyethylene alkyl ether (C) having an HLB value of 12.1 or more.

Description

[Technical Field]

[0001] The present invention relates to a hot melt adhesive, particularly an alkali-removable hot melt adhesive suitable as a label adhesive for use on PET bottles and glass bottles, and to containers to which labels are adhered with said hot melt adhesive. [Background technology]

[0002] In recent years, as demand for PET bottles has increased, the amount of PET bottles used for beverages has also increased, making PET bottle recycling technology important. Labels are attached to the surface of these PET bottles with adhesive, and labels made of biaxially oriented polypropylene film (OPP) or PET film roll labels are often used.

[0003] PET bottle recycling involves a process in which labeled PET bottles are washed in a heated alkaline solution to separate the bottles from the labels. Therefore, the hot-melt adhesive used to attach the labels to PET bottles must be alkali-removable. The Council for PET Bottle Recycling's Voluntary PET Bottle Restriction Guidelines stipulate the following criteria for alkali-removability: When pellets made by cutting labeled bottles are immersed in a 1.5% sodium hydroxide solution at 85°C and stirred for 15 minutes, the label must peel off from the PET pellets, and no printing ink or adhesive must remain on the PET pellets. Recently, there has been a significant increase in demand for recycling PET bottles and remanufacturing them as PET bottles. This requires that labels be more easily separated during the recycling process and that alkali-removal times be shorter than the criteria stated above.

[0004] On the other hand, when consumers remove labels from PET bottled beverages, they generally do so by hand. Considering the reuse of PET bottles, it is desirable for labels to not leave any adhesive residue on the PET bottle when peeled off by hand (low adhesive residue: adhesive residue-resistant).

[0005] Furthermore, if the contents contain carbonated drinks, the PET bottle will expand over time, putting stress on the label, which can cause the label to shift, float, and peel off. Therefore, the label needs to be resistant to shifting, and even if it does shift, it needs to stay firmly attached (adhesion). Therefore, hot melt adhesives need to have high adhesive strength to the label, as well as the ability to resist and conform to the label's shifting caused by bottle expansion.

[0006] Furthermore, in recent years, due to environmental considerations, labels and adhesives have become thinner (normal: 30-50 μm, thin: 5-15 μm), and hot melt adhesives are required to have high adhesive strength to the label, resistance to slippage, and conformability so that the label does not peel off even when applied in a thin film.

[0007] Patent Document 1 discloses a hot melt adhesive containing a styrene-based elastomer (A), a rosin-based tackifier (B) having an acid value of 100 mgKOH / g or more and 300 mgKOH / g or less, a process oil (C), a specific wax (D) consisting of an acrylic acid wax and a maleic anhydride wax, and a hydrogenated petroleum-based tackifier (E).

[0008] Patent Document 2 discloses a hot melt adhesive containing a thermoplastic elastomer (A), a solid tackifier (B) having an acid value of 100 mgKOH / g or more and 300 mgKOH / g or less, a liquid tackifier (C), a wax (D), and a specific nonionic surfactant (E).

[0009] The hot melt adhesives described in Patent Documents 1 and 2 have sufficient adhesive strength between labels and resistance to label misalignment, but studies by the present inventors have shown that the adhesive strength and resistance are significantly reduced when a thin film is applied, posing a problem in the actual application of the adhesive when a thin film is applied. Also, since it takes a relatively long time to peel the adhesive with an alkali, it cannot be said that the requirement for complete removal in a short time is met.

[0010] Therefore, there is a need for the development of a hot melt adhesive that is excellent in all properties, including alkali peelability, adhesive strength, and adhesiveness, even when applied in a thin film. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Publication No. 2019-119811 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-1624 Summary of the Invention [Problem to be solved by the invention]

[0012] An object of the present invention is to provide a hot melt adhesive that, even when applied in a thin film, has high adhesive strength, resistance to label displacement due to bottle expansion, and followability (actual adhesion), making labels less likely to peel off, and that can be separated from PET bottles in a short time using a hot alkaline aqueous solution. [Means for solving the problem]

[0013] The present invention relates to the following hot melt adhesive and container. [1] A hot melt adhesive comprising a styrene-based elastomer (A), a rosin-based tackifier (B) having an acid value of 100 to 350 mg KOH / g, and a polyoxyethylene alkyl ether (C) having an HLB value of 12.1 or more.

[0014] [2] The above hot melt adhesive, wherein the content of the polyoxyethylene alkyl ether (C) in 100% by mass of the hot melt adhesive is 1 to 5% by mass.

[0015] [3] The above hot melt adhesive further comprising a hydrogenated petroleum-based tackifier (D).

[0016] [4] The above hot melt adhesive, wherein the content of the hydrogenated petroleum-based tackifier (D) in 100% by mass of the hot melt adhesive is more than 25% by mass and not more than 45% by mass.

[0017] [5] A container to which a label is attached using the above hot melt adhesive.

[0018] [6] The above container in which the label is a body-wrapped label.

[0019] [7] The above container, the label of which is made of polypropylene. [Effects of the Invention]

[0020] The hot melt adhesive of the present invention has high alkali peeling properties, and when immersed in a hot alkaline aqueous solution, the label can be peeled off from the container without leaving any adhesive residue in a time shorter than the indicators of the current guidelines, and there is no re-adhesion.

[0021] The hot melt adhesive of the present invention has excellent adhesive strength and adhesiveness even when applied in a thin film. Therefore, when a label is attached to a PET bottle for a carbonated drink using the hot melt adhesive of the present invention, the label is less likely to shift, float, or peel off when the PET bottle expands. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following describes in detail the embodiments of the present invention. However, the following description of the constituent elements is an example of an embodiment of the present invention, and the present invention is not limited to these contents as long as it does not exceed the gist of the present invention.

[0023] In this specification, a numerical range specified using "to" is intended to include the numerical values ​​before and after "to" as the range's lower and upper limits.

[0024] <Hot melt adhesive> The hot melt adhesive of the present invention comprises a styrene-based elastomer (A), a rosin-based tackifier (B) having an acid value of 100 to 350 mgKOH / g, and a polyoxyethylene alkyl ether (C) having an HLB value of 12.1 or more. The hot melt adhesive of the present invention is suitable as a label adhesive for use on PET bottles and glass bottles, and is particularly suitable as an adhesive for use in bonding labels to PET bottles for carbonated drinks.

[0025] (Styrene-based elastomer (A)) The styrene elastomer (A) may be any known styrene copolymer, and is not particularly limited. Specific examples include styrene-butadiene-styrene copolymer (hereinafter simply referred to as SBS), styrene-butadiene-styrene-butadiene copolymer (hereinafter simply referred to as SBSB), styrene-butadiene / butylene-styrene copolymer (hereinafter simply referred to as SBBS), styrene-ethylene / butylene-styrene copolymer (hereinafter simply referred to as SEBS), styrene-ethylene / propylene-styrene copolymer (hereinafter simply referred to as SEPS), styrene-ethylene-ethylene / propylene-styrene copolymer (hereinafter simply referred to as SEEPS), and styrene-isoprene-styrene block copolymer (hereinafter simply referred to as SIS).

[0026] Furthermore, it is preferable that the styrene-based elastomer (A) contains a hydrogenated styrene-based elastomer in part or in whole. By including a hydrogenated styrene-based elastomer, viscosity change is reduced even when the hot melt adhesive is left in a heated state in an applicator tank for a long period of time, and fluctuations in adhesive properties can be reduced. Specific examples of hydrogenated styrene-based elastomers include styrene-butadiene / butylene-styrene block copolymer (SBBS), styrene-ethylene / propylene-styrene (SEPS), and styrene-ethylene / butylene-styrene (SEBS). Among these, it is particularly preferable to include styrene-ethylene / butylene-styrene (SEBS) because it is easy to balance various physical properties.

[0027] The content of the styrene elastomer (A) in 100% by mass of the hot melt adhesive is preferably 10 to 30% by mass, more preferably 12 to 25% by mass. By containing the styrene elastomer (A) in the above range, it is possible to achieve both alkali peelability and adhesive strength, which is preferable.

[0028] (Rosin-based tackifier (B)) The rosin-based tackifier (B) is not particularly limited as long as it has an acid value of 100 to 350 mgKOH / g. If the acid value is less than 100 mgKOH / g, sufficient alkali peelability cannot be exhibited, while if the acid value is more than 350 mgKOH / g, the viscosity of the hot melt adhesive becomes too high. The acid value is the number of milligrams of potassium hydroxide (KOH) required to neutralize 1 g of sample. The method for measuring the acid value is described in detail in the Examples section.

[0029] Examples of the rosin-based tackifier (B) include unmodified unhydrogenated rosin, unmodified hydrogenated rosin, (meth)acrylic acid-modified rosin, hydrogenated (meth)acrylic acid-modified rosin, maleic acid-modified rosin, hydrogenated maleic acid-modified rosin, fumaric acid-modified rosin, hydrogenated fumaric acid-modified rosin, etc. The above-mentioned rosin-based tackifier (B) may be used alone or in combination of two or more.

[0030] The content of the rosin-based tackifier (B) in 100% by mass of the hot melt adhesive is preferably 10 to 35% by mass, more preferably 15 to 30% by mass. By containing the rosin-based tackifier (B) in the above range, both alkali peelability and actual application can be achieved, which is preferable.

[0031] (Polyoxyethylene alkyl ether (C)) The polyoxyethylene alkyl ether (C) has an HLB value of 12.1 or higher and is an ether obtained by ethoxylating alcohol with ethylene oxide. The inclusion of polyoxyethylene alkyl ether makes the label easier to peel with alkali and reduces adhesive residue when the label is peeled off. If the HLB value of the polyoxyethylene alkyl ether (C) is less than 12.1, sufficient alkali strippability cannot be exhibited. HLB is an index showing the hydrophilic-lipophilic balance, and is a value calculated according to the Griffin method by the formula "HLB = 20 × (wt % of hydrophilic groups)".

[0032] The polyoxyethylene alkyl ether (C) preferably has a melting point of 86° C. or less or is liquid (no melting point) at room temperature. By containing such a polyoxyethylene alkyl ether (C), alkali stripping can be achieved in a short time, which is preferable.

[0033] The content of the polyoxyethylene alkyl ether (C) in 100% by mass of the hot melt adhesive is preferably 1 to 5% by mass, more preferably 2 to 4% by mass. By containing the polyoxyethylene alkyl ether (C) in the above range, both alkali peelability and actual application property can be achieved, which is preferable.

[0034] (Hydrogenated petroleum-based tackifier (D)) The hot melt adhesive of the present invention preferably further contains a hydrogenated petroleum-based tackifier (D) in terms of practical application. Examples of the hydrogenated petroleum-based tackifier (D) include known hydrogenated petroleum-based tackifiers, and are not particularly limited. Specific examples include partially hydrogenated petroleum resins and / or fully hydrogenated petroleum resins obtained by adding hydrogen to one or more petroleum resins selected from the group consisting of petroleum resins such as C5 petroleum resins, C9 petroleum resins, C5C9 petroleum resins, and dicyclopentadiene petroleum resins. The above-mentioned hydrogenated petroleum-based tackifiers (D) may be used alone or in combination of two or more.

[0035] The content of the hydrogenated petroleum-based tackifier (D) in 100% by mass of the hot melt adhesive is preferably more than 25% by mass but not more than 45% by mass, more preferably 28 to 40% by mass. By containing the hydrogenated petroleum-based tackifier (D) in the above range, both alkali peelability and actual adhesion can be achieved at a higher level, which is preferable.

[0036] (Process oil (E)) The hot melt adhesive of the present invention may contain a process oil (E). Examples of the process oil (E) include paraffinic process oil, naphthenic process oil, and aromatic process oil. It is particularly preferable to contain a paraffinic process oil or naphthenic process oil. By containing a paraffinic process oil or naphthenic process oil, both alkali peelability and high adhesive strength can be achieved, which is preferable. Furthermore, the above-mentioned process oil (E) may be used alone or in combination of two or more types.

[0037] The content of the process oil (E) in 100% by mass of the hot melt adhesive is preferably 15 to 40% by mass, more preferably 20 to 35% by mass. By containing the process oil (E) in the above range, both alkali removability and actual adhesion can be achieved at a higher level, and adhesive residue is less likely to be left when the adhesive is peeled off, which is preferable.

[0038] (Wax (F)) The hot melt adhesive of the present invention may contain a wax (F). Examples of the wax (F) include known waxes, and are not particularly limited. Specific examples include paraffin wax, Fischer-Tropsch wax, carnauba wax, candelilla wax, montan wax, polyethylene wax, polypropylene wax, acid-modified products of these waxes, special monomer-modified products, ethylene-acrylic acid copolymer wax, ethylene-methacrylic acid copolymer wax, etc. The above-mentioned waxes (F) may be used alone or in combination of two or more.

[0039] The content of the wax (F) in 100% by mass of the hot melt adhesive is preferably 1 to 10% by mass, more preferably 2 to 7% by mass. By containing the wax (F) in the above range, both alkali removability and actual adhesion can be achieved at a higher level, and adhesive residue is less likely to be left when the adhesive is peeled off, which is preferable.

[0040] (additives) In addition to the above-described components (A) to (F), additives may be added to the hot melt adhesive of the present invention as appropriate to impart desired properties. Examples of such additives include antioxidants, ultraviolet absorbers, and fluorescent brighteners. The content of the additives may be adjusted as appropriate within a range that satisfies the content of the above-described components (A) to (F) in the hot melt adhesive.

[0041] ≪Container≫ The term "container" as used herein refers to a container to which a label has been attached using the hot melt adhesive. The hot melt adhesive of the present invention is preferably used to attach a label to a PET bottle, and in this case, the PET bottle to which the label has been attached is the container of the present invention.

[0042] PET bottles often have labels attached to a portion of the bottle's body, as well as labels wrapped around the bottle's body to encircle it. The hot melt adhesive of the present invention is also preferably used for bonding these labels. OPP film is often used for such labels. The hot melt adhesive of the present invention can provide good adhesion to labels wrapped around the body, such as OPP film, both with and without printing on the backside. The hot melt adhesive of the present invention may be applied to the entire backside of the label, or the adhesive may be applied to only a portion of the backside of the label. Application methods include the open wheel method, the closed gun method, and the direct coat method. The open wheel method and the direct coat method are preferred as methods that do not leave adhesive on the PET bottle or the like when peeled off.

[0043] Biaxially oriented polypropylene (OPP), polyethylene (PE), PET, and even paper are commonly used as label substrates for PET bottles. Labels are typically printed on the side opposite to the side to which the hot melt adhesive is applied, i.e., the front side of the label, or on the side to which the hot melt adhesive is applied, i.e., the back side of the label. The hot melt adhesive of the present invention can be applied to a printed label surface or, of course, to an unprinted label. In either case, it exhibits the desired adhesive properties, peelability, and hot alkaline water solubility. The printing may cover the entire back side of the label, or only a portion of the surface. The printing may be performed by any of the conventional printing methods, such as gravure printing or UV printing. [Example]

[0044] The present invention will be described in more detail below with reference to examples and comparative examples. The present invention is not limited to the following examples. In the examples, unless otherwise specified, "parts" means "quantity" "Parts by mass" indicates "parts by mass" and "%" indicates "% by mass".

[0045] [Acid value measurement] Measurements were performed in accordance with JIS K2501 (indicator titration method). Specifically, the sample was precisely weighed and placed in a 250 ml flask, and 50 ml of ethanol or an equal volume mixture of ethanol and ether was added. The sample was then heated to dissolve, and titrated with 0.1 N potassium hydroxide solution (indicator: phenolphthalein) while frequently shaking. The titration endpoint was determined as the point at which the pale pink color of the solution remained for 30 seconds. A blank test was then performed in the same manner, and correction was made, and the acid value was calculated using the following formula (1). (Formula 1) Acid value (mgKOH / g) = [0.1N potassium hydroxide solution consumption (ml) x 5.611] / [sample amount (g)]

[0046] [Melt point measurement] The measurement was performed using a PerkinElmer Pysis 1 instrument manufactured by PerkinElmer. The melting point was measured by first holding the sample at 0°C for 5 minutes, then raising the temperature to 170°C at a rate of 10°C / min, holding the sample at 170°C for 1 minute, then lowering the temperature to 0°C at a rate of 40°C / min, holding the sample at 1°C for 1 minute, and then raising the temperature again to 170°C at a rate of 10°C / min.

[0047] The abbreviations listed in Tables 1 to 4 are as follows: [Styrene-based elastomer (A)] A1: G-1650 (Kraton styrene-ethylene / butylene-styrene block copolymer, hydrogenated elastomer) A2: G-1652 (Kraton styrene-ethylene / butylene-styrene block copolymer, hydrogenated elastomer) A3: G-1726 (Kraton styrene-ethylene / butylene-styrene block copolymer, hydrogenated elastomer) [Rosin-based tackifier (B)] B1: Haritack F (Harima Chemicals hydrogenated rosin, acid value 170-175 mg KOH / g) B2: KR-120 (Arakawa Chemical Co., Ltd., acid-modified rosin, acid value 305-345 mg KOH / g) [Polyoxyethylene alkyl ether (C)] C1: Unitox 480 (polyoxyethylene alkyl ether, HLB 16.0, melting point 86°C, manufactured by NuCera Solutions) C2: Unitox 490 (NuCera Solutions polyoxyethylene alkyl ether, HLB 18.0, melting point 71°C) C3: Emulgen 320P (Kao Corporation polyoxyethylene alkyl ether, HLB 13.9, melting point 28°C) C4: Emulgen 707 (Kao Corporation polyoxyethylene alkyl ether, HLB 12.1, liquid at room temperature) [Other polyoxyethylene alkyl ethers (C')] C'1: Unitox 450 (polyoxyethylene alkyl ether, HLB 10, melting point 91°C, manufactured by NuCera Solutions) [Hydrogenated petroleum-based tackifier (D)] D1: Alcon P-90 (hydrogenated aliphatic hydrocarbon resin manufactured by Arakawa Chemical Industries, Ltd.) D2: Alcon P-100 (hydrogenated aliphatic hydrocarbon resin manufactured by Arakawa Chemical Industries, Ltd.) [Process Oil (E)] E1: PS-32 (paraffin-based process oil manufactured by Idemitsu Kosan) E2: PW-90 (paraffin-based process oil manufactured by Idemitsu Kosan) E3: N-90 (naphthenic process oil manufactured by Idemitsu Kosan) Wax F1: Sasol Wax C80 (Fischer-Tropsch wax manufactured by Sasol Chemical Industries Limited) F2: Viscol 660-P (polypropylene wax manufactured by Sanyo Chemical Industries, Ltd.) F3: Polyretz 200EL (polyethylene wax manufactured by SCG Performance Chemicals)

[0048] Example 1 <Manufacturing of hot melt adhesives> A stainless steel beaker equipped with a stirrer was charged with 22 parts of E1 (PS-32) as the process oil (E), 24 parts of B1 (Harritac F) as the rosin-based tackifier (B), and 34 parts of D1 (Arcon P-90) as the hydrogenated petroleum-based tackifier (D), and heated to melt. Heating was performed carefully so that the contents would reach a temperature of 130 to 150°C. After melting, the mixture was stirred to form a homogeneous molten solution. While maintaining the temperature at 130 to 150°C and continuing to stir, 13 parts of A1 (G-1650) as the styrene-based elastomer (A) was added to the melt. After the addition was complete, the mixture was heated and stirred at 130 to 150°C until the styrene-based elastomer (A) was completely melted. Thereafter, 5 parts of F1 (Sazolwax C80) as the wax (F) and 2 parts of C1 (Unitox 480) as the polyoxyethylene alkyl ether (C) were added to form a molten homogeneous mixture, which was then cooled to produce a hot melt adhesive.

[0049] (Examples 2 to 33, Comparative Examples 1 to 3) The compositions shown in Tables 1 to 4 were melted and mixed in the same manner as in Example 1 to prepare hot melt adhesives.

[0050] The alkali peelability, adhesive strength (to OPP), and actual adhesion of the obtained hot melt adhesive were evaluated by the following methods.

[0051] <Alkali strippability> (Sample production method) A label was printed on a 30 μm thick OPP film, and a hot melt adhesive was hand-coated to a thickness of 5 to 15 μm (temperature conditions: 150°C) to obtain a label with the hot melt adhesive. The label with the hot melt adhesive was attached to a PET bottle at 23°C, pressed back and forth with a hand roller, and crushed into approximately 8 mm x 8 mm squares to obtain PET pellets with the label attached. (Test Method) 180 g of a 1.5% by mass aqueous solution of sodium hydroxide at 80 to 85°C and 20 g of the pellets were placed in a 1000 ml round flask and stirred at 120 rpm (stirring blade: propeller). After 5 minutes, the mixture was filtered and the residual rate (area %) of adhesive remaining on the PET pellets was visually observed. (Evaluation criteria) ◎: Labels with hot melt adhesive and hot melt adhesive do not remain on the PET pellets: Very good ○: No hot melt adhesive label remains, but less than 10% (area %) of the hot melt adhesive remains on the PET pellets: Good △: 10% (area %) or more but less than 30% (area %) of the hot melt adhesive remains on the PET pellets: Suitable for practical use ×: 30% or more (area %) of the hot melt adhesive remains on the PET pellets: Unsuitable for practical use

[0052] <Adhesive strength> (Sample production method) A label with a hot melt adhesive was obtained in the same manner as described above. The label with the hot melt adhesive was attached to the non-printed side of a 30 μm thick OPP film at 23° C., pressed back and forth with a hand roller, and cut to a width of 15 mm to prepare a test sample. (Test Method) The test was carried out in a thermostatic chamber at 23°C, with 180° peeling (peeling speed: 300 mm / min). (Evaluation criteria) ◎: 3.0N / 15mm or more: Very good ○: 2.0N / 15mm or more and less than 3.0N / 15mm: Good △: 1.0N / 15mm or more and less than 2.0N / 15mm: Practical ×: Less than 1.0N / 15mm: Not practical

[0053] <Actual adhesion> (Sample production method) A label with a hot melt adhesive was obtained in the same manner as described above. The label with the hot melt adhesive was attached to a 1.5 L round PET bottle. Carbonated water (commercially available) was filled into the resulting labeled bottle to prepare a test sample. (Test Method) The bottle was placed in a constant temperature oven at 40°C, and the appearance was observed after one week. (Evaluation criteria) ◎: Label misalignment is less than 1mm: Very good ○: Label misalignment is 1mm or more but less than 10mm: Good △: Label misalignment is 10mm or more: Usable ×: Label peels off: Not practical

[0054] From Examples 1 to 33 in Tables 1 to 4, it can be seen that the hot melt adhesive of the present invention has high adhesive strength and good adhesion against label misalignment due to bottle expansion, even when the hot melt adhesive is applied in a thin film, and the label is not easily peeled off, and further has excellent alkali peelability in a short time. On the other hand, the hot melt adhesives of Comparative Examples 1 to 3 did not provide satisfactory results in all of the alkali peelability, adhesive strength, and actual adhesion.

[0055] [Table 1]

[0056] [Table 2]

[0057] [Table 3]

[0058] [Table 4] [Industrial Applicability]

[0059] As explained above, the hot melt adhesive of the present invention allows labels to be easily peeled off when recycling used containers, etc., and allows for easy separation by immersion in a hot alkaline aqueous solution. Furthermore, it has been found that the same performance is exhibited not only in PET bottles but also in glass containers, making this hot melt adhesive suitable for recycling glass containers.

Claims

1. The adhesive composition comprises a styrene-based elastomer (A), a rosin-based tackifier (B) having an acid value of 100 to 350 mgKOH / g, and a polyoxyethylene alkyl ether (C) having an HLB value of 12.1 or more, A hot melt adhesive, wherein the content of polyoxyethylene alkyl ether (C) in 100% by mass of the hot melt adhesive is 1 to 6% by mass.

2. The hot melt adhesive according to claim 1, further comprising a hydrogenated petroleum-based tackifier (D).

3. 3. The hot melt adhesive according to claim 2, wherein the content of the hydrogenated petroleum-based tackifier (D) in 100% by mass of the hot melt adhesive is more than 25% by mass and not more than 45% by mass.

4. A container to which a label is adhered with the hot melt adhesive according to any one of claims 1 to 3.

5. 5. The container of claim 4, wherein the label is a wraparound label.

6. 5. The container according to claim 4, wherein the label is made of polypropylene.

Images