Paper label laminate and method for manufacturing the same

Abstract

To provide a paper label laminate capable maintaining both of orthostatic property and scratch resistance at a high level for a long time under high temperature and high humidity, although it is an environmentally friendly member, and a manufacturing method of the paper label laminate.SOLUTION: A paper label laminate 1 comprising water resistant paper 10 having water resistance treatment, a first adhesive layer 40 stacked on a first surface of the water resistant paper 10, a first cellophane layer 20 stacked on the first adhesive layer 40, and a second adhesive layer 50 stacked on a second surface opposite the first surface of the water resistant paper 10, and a second cellophane layer 30 stacked on the second adhesive layer 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In recent years, in order to make products stand out when they are displayed in retail stores, etc., POP (Point of Purchase) labels (also known as "POP sheets," "eye-catching labels," "attention labels," etc.) have been affixed to product containers, packaging, etc. These POP labels often have messages and information printed on them that are expected to have a sales promotion effect.

[0003] As an example of such a POP label, Patent Document 1 discloses a labeled container having a container and a POP label attached to the container, wherein the container has a body portion, a top surface portion, and a protruding portion formed between the body portion and the top surface portion and protruding outward from the outer surface of the body portion, and the POP label has a laminated first substrate and a second substrate, the second substrate is attached across the top surface portion, the protruding portion, and the body portion of the container, and the information portion of the first substrate is separated from the second substrate and stands above the top surface portion of the container.

[0004] Patent Document 2 discloses a labeled container that includes a container and a condensation-suppressing label attached to the container, the condensation-suppressing label having a cellophane layer on its surface.

[0005] Patent Document 3 also discloses a label having a facestock layer having a first surface and a second surface, visible indicia selectively applied to one or more locations on at least one of the first surface and the second surface of the facestock layer, and at least one tactile coating layer selectively applied to separate portions of the first surface of the facestock layer to create clearly identifiable raised portions on the label for a tactile sensation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2017-047945 [Patent Document 2] Japanese Patent Application Publication No. 2018-047926 [Patent Document 3] Special Publication No. 2006-510058 Summary of the Invention [Problem to be solved by the invention]

[0007] In response to the growing demand for the creation of a recycling-oriented society, there is a desire to move away from fossil fuels in labels such as POP labels, and the replacement of petroleum-derived plastic materials with paper materials is being considered. For example, in response to this trend toward plastic-free labels, the use of laminates using paper labels (paper label laminates) is being considered. However, when conventional paper label laminates are used in POP labels, etc., although the environmental impact can be reduced to some extent, there is a problem in that they cannot meet the performance requirements of POP labels, etc.

[0008] For example, paper label laminates used in POP labels and the like are required to be able to stand upright (stand up) even in high temperature and humidity environments, but conventional paper label laminates are prone to shrinkage due to heat and humidity and are unable to maintain this stand upright for long periods of time.

[0009] Furthermore, labels are also desired to have excellent abrasion resistance, but the reality is that a paper label laminate that can maintain both high levels of standability and abrasion resistance for a long period of time under the above-mentioned high temperature and humidity conditions has not yet been developed. In particular, when cellophane is used as a laminating material or the like for the purpose of reducing the burden on the environment, this problem becomes more pronounced because cellophane has the property of shrinking due to heat and humidity.

[0010] The present invention has been made in consideration of the above circumstances, and its main object is to provide a paper label laminate that is environmentally friendly yet can maintain high levels of both standability and abrasion resistance for long periods of time even under high temperature and humidity conditions, and a method for manufacturing a paper label laminate. [Means for solving the problem]

[0011] As a result of extensive research into achieving the above-mentioned object, the inventors discovered the need for a paper label laminate comprising waterproof paper that has been treated to be waterproof, a first adhesive layer laminated on a first surface of the waterproof paper, a first cellophane layer laminated on the first adhesive layer, a second adhesive layer laminated on a second surface of the waterproof paper opposite the first surface, and a second cellophane layer laminated on the second adhesive layer, and thus completed the present invention.

[0012] That is, the present invention is as follows.

[0013] (1) The paper label laminate includes waterproof paper that has been treated to be waterproof, a first adhesive layer laminated on a first surface of the waterproof paper, a first cellophane layer laminated on the first adhesive layer, a second adhesive layer laminated on a second surface of the waterproof paper that is opposite the first surface, and a second cellophane layer laminated on the second adhesive layer. (2) The paper label laminate according to (1), wherein the first cellophane layer and the second cellophane layer both contain moisture-proof cellophane. (3) The paper label laminate according to (1) or (2), wherein the waterproof paper has a wet tensile strength in the MD direction of 1.0 to 3.5 kN / m. (4) The paper label laminate according to any one of (1) to (3), wherein the waterproof paper has a wet tensile strength in the CD direction of 0.5 to 2.0 kN / m. (5) The paper label laminate according to any one of (1) to (4), further comprising a third adhesive layer laminated on the second cellophane layer of the paper label laminate, and a release paper laminated on the third adhesive layer. (6) This method for producing a paper label laminate includes the steps of: laminating a first cellophane layer, via a first adhesive layer, onto a first surface of waterproof paper that has been subjected to a water-resistant treatment, to obtain a laminate; and laminating a second cellophane layer, via a second adhesive layer, onto a second surface of the waterproof paper, which is opposite the first surface, to obtain a paper label laminate. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a paper label laminate that is an environmentally friendly member yet can maintain high levels of both standability and abrasion resistance for long periods of time under high temperature and humidity conditions, and a method for manufacturing the paper label laminate. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view of a paper label laminate according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a paper label laminate according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0017] In the drawings, the same elements are given the same reference numerals, and redundant explanations will be omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the ratios shown in the drawings.

[0018] In addition, in this specification, unless otherwise specified, "(meth)acrylic" includes methacryl and acrylic. For example, (meth)acrylic means methacryl, acrylic, or both.

[0019] <Paper label laminate 1, 2>

[0020] FIG. 1 is a cross-sectional view of a paper label laminate according to the first embodiment.

[0021] The paper label laminate 1 of the first embodiment includes waterproof paper 10 that has been treated to be waterproof, a first adhesive layer 40 laminated on a first surface of the waterproof paper 10, a first cellophane layer 20 laminated on the first adhesive layer 40, a second adhesive layer 50 laminated on a second surface opposite the first surface of the waterproof paper 10, and a second cellophane layer 30 laminated on the second adhesive layer 50.

[0022] The paper label laminate 1 is a laminate formed by laminating, from top to bottom in Figure 1, a first cellophane layer 20, a first adhesive layer 40, waterproof paper 10, a second adhesive layer 50, and a second cellophane layer 30 in that order.

[0023] The paper label laminate 1 is an environmentally friendly component because the waterproof paper 10, the first cellophane layer 20, and the second cellophane layer 30 are made of so-called carbon-neutral materials. "Carbon neutral" here means that it does not contribute to the amount of carbon released into the atmosphere (measured as carbon dioxide emissions) and there is no need to reduce that amount.

[0024] Furthermore, by providing a first cellophane layer 20 on the first surface (e.g., the upper surface in Figure 1) of the waterproof paper 10 and a second cellophane layer 30 on the second surface (e.g., the lower surface in Figure 1), the paper label laminate 1 is an environmentally friendly component that can maintain high levels of both long-term standability and abrasion resistance in high-temperature, high-humidity environments.

[0025] As will be described later, the paper label laminate 1 can be suitably used as a POP label by providing a printed display surface on the surface of the waterproof paper 10. Alternatively, a printed display surface may be provided on the surface of the first cellophane layer 20 or the second cellophane layer 30.

[0026] POP labels are attached to one end of containers, packaging, etc., so that a portion of them protrudes from the surface. In this case, they can maintain their upright position for long periods of time even in high temperature and humidity, so they do not sag or tilt when placed on display shelves.

[0027] POP labels are required to have a printed display surface that is easily visible from the outside. In this regard, because the paper label laminate 1 has excellent abrasion resistance, the visibility of the letters and pictures printed on the printed display surface of the waterproof paper 10 is not reduced by scratches on the surfaces of the first cellophane layer 20 and the second cellophane layer 30.

[0028] Each of the members that make up the paper label laminate 1 will be described below.

[0029] (Waterproof paper 10)

[0030] In this embodiment, waterproof paper 10 that has been subjected to a waterproofing treatment is used.

[0031] At least one surface of the waterproof paper 10 can be a printed display surface on which letters, pictures, etc. are printed. On such a printed display surface, messages and information that can be expected to have a sales promotion effect on the product to which it is attached (containers, packaging, etc.) can be displayed.

[0032] The basis weight of the waterproof paper 10 is not particularly limited, but is preferably 5 to 300 g / m 2 The lower limit of the basis weight is preferably 40 g / m 2 More preferably, it is 60 g / m or more. 2 The upper limit of the basis weight is 150 g / m 2It is more preferable that the paper label laminate 1 is equal to or less than 1 / 2. By controlling the lower limit of the basis weight within the above range, the standability of the paper label laminate 1 is further improved. Furthermore, by controlling the upper limit of the basis weight within the above range, the paper label laminate 1 does not become too stiff, and has excellent conformability even when the adherend (container, packaging, etc.) has a curved surface. Therefore, even when the paper label laminate 1 is attached to a curved surface, the paper label laminate 1 does not lift up from the adherend, and can be adhered flush.

[0033] The thickness of the waterproof paper 10 is not particularly limited, but is preferably 5 to 500 μm. The lower limit of the thickness is more preferably 10 μm or more, even more preferably 40 μm or more, and even more preferably 60 μm or more. The upper limit of the thickness is more preferably 300 μm or less, and even more preferably 150 μm or less. By controlling the thickness within this range, it is possible to maintain uprightness for a long period of time even under high temperature and humidity conditions.

[0034] From the viewpoint of standability, the wet tensile strength in the MD (Machine Direction) of the waterproof paper 10 is preferably 1.0 to 3.5 kN / m. The lower limit of this wet tensile strength is more preferably 1.5 kN / m or more. The upper limit of this wet tensile strength is more preferably 3.4 kN / m or less. The MD direction of the waterproof paper 10 refers to the direction in which the paper machine travels, and the wet tensile strength of the waterproof paper 10 in the MD direction can be measured by a method in accordance with JIS P 8135:1998. Specifically, this is a value measured based on the method described in the examples.

[0035] From the viewpoint of standability, the wet tensile strength in the cross direction (CD) of the waterproof paper 10 is preferably 0.5 to 2.0 kN / m. The lower limit of this wet tensile strength is more preferably 0.6 kN / m or more, even more preferably 0.7 kN / m or more, and even more preferably 0.8 kN / m or more. The upper limit of this wet tensile strength is more preferably 1.9 kN / m or less, and even more preferably 1.6 kN / m or less. The CD direction of the waterproof paper 10 refers to the direction perpendicular to the MD direction, and the wet tensile strength in the CD direction of the waterproof paper 10 can be measured by a method in accordance with JIS P 8135:1998. Specifically, this is a value measured based on the method described in the examples.

[0036] From the viewpoint of standability, the ratio of the wet tensile strength in the MD direction to the wet tensile strength in the CD direction (MD / CD) is preferably 0.5 to 4.4. The lower limit of this ratio is more preferably 0.6 or more, even more preferably 1.0 or more, even more preferably 1.5 or more, and even more preferably 1.6 or more. The upper limit of this ratio is more preferably 3.0 or less, even more preferably 2.5 or less, even more preferably 2.3 or less, and even more preferably 2.2 or less.

[0037] In the configuration of the paper label laminate 1 according to this embodiment, the waterproof paper 10, whose MD and CD wet tensile strengths are controlled in this way, can be used in combination with the first cellophane layer 20 and the second cellophane layer 30, described below, to maintain high levels of both long-term standability and abrasion resistance under high temperature and humidity conditions. Such effects cannot be obtained with paper label laminates that use paper other than the waterproof paper 10, such as fine paper or gloss paper, which have the disadvantage of significantly decreasing in strength when they absorb moisture.

[0038] The raw materials for the waterproof paper 10 may include, for example, pulp raw materials, fillers, waterproofing agents, wet strength agents, and other additives.

[0039] Pulp raw materials include, for example, chemical pulps such as unbleached softwood pulp (NUKP), unbleached hardwood pulp (LUKP), bleached softwood pulp (NBKP), and bleached hardwood pulp (LBKP); mechanical pulps such as stone ground pulp (SGP), pressurized stone ground pulp (PGW), refiner ground pulp (RGP), chemi-ground pulp (CGP), thermo-ground pulp (TGP), ground pulp (GP), thermomechanical pulp (TMP), chemi-thermomechanical pulp (CTMP), and refiner mechanical pulp (RMP); and waste paper pulp made from waste paper, such as disintegrated and deinked waste paper pulp and disintegrated, deinked, and bleached waste paper pulp produced from waste magazine paper, waste flyer paper, and waste office paper. Among these, bleached softwood pulp (NBKP), bleached hardwood pulp (LBKP), and mixtures thereof are particularly preferred. These may be used alone or in combination of two or more.

[0040] Examples of fillers include various inorganic compounds such as talc, clay, mica, glass (fiber, powder), silicates such as calcium silicate, carbonates such as calcium carbonate and magnesium carbonate, sulfates such as calcium sulfate and barium sulfate, oxides such as silica, alumina, and titanium oxide, hydroxides such as aluminum hydroxide and magnesium hydroxide, and various organic compounds known as plastic pigments. The addition of fillers can further improve the strength of the waterproof paper 10. These may be used alone or in combination of two or more.

[0041] The content of the filler is not particularly limited, but is preferably 3 to 18% by mass, more preferably 4% by mass or more in lower limit, and more preferably 12% by mass or less in upper limit.

[0042] Examples of other additives include neutralizing agents, fixing agents, thickeners, sizing agents, paper strength agents, dry paper strength agents, antifoaming agents, water retention agents, dyes, pigments, and the like.

[0043] Examples of wet strength agents include polyamine resins and their derivatives, polyamide epichlorohydrin, urea, melamine, and thermally crosslinkable polyacrylamide. Wet strength agents act as wet strength enhancers to impart water resistance. Polyamine resins are resins and derivatives thereof obtained from so-called polyamines having two or more amino or imino groups and epihalohydrin. For example, commercially available products such as "WS-4010" and "WS-4011" manufactured by Seiko PMC Corporation can also be used.

[0044] The content of the wet strength agent is preferably 0.2 to 3.0 parts by mass, more preferably 0.5 to 2.5 parts by mass, per 100 parts by mass of pulp. By setting the lower limit of this content within the above range, water resistance is further improved, and by setting the upper limit of this content within the above range, water resistance can be imparted without an excessive amount being added, which is economical.

[0045] Examples of waterproofing agents include polyvinyl alcohol resin, polyacrylamide, urea-formaldehyde resin, melamine-formaldehyde resin, dialdehyde, starch, polyamide polyamine, epichlorohydrin formaldehyde, glyoxal, dialdehyde starch, modified polyamide resin, modified amine resin, urea-formaldehyde resin, melamine-formaldehyde resin, polyamide urea-formaldehyde resin, ketone resin, polyamide epichlorohydrin resin, glycerol polyglycidyl ether resin, ammonium zirconium carbonate, zinc sulfate, borax, satin white, SBR (styrene-butadiene rubber) latex, vinyl acetate latex, vinyl chloride latex, vinylidene chloride latex, and other resin latexes. These may be used alone or in combination of two or more.

[0046] The waterproof paper 10 can be manufactured by a known papermaking method. Addition of fillers, waterproofing agents, wet strength agents, and other additives can be done either internally by adding them to the pulp slurry during papermaking, or externally by impregnating the pulp with a size press or the like after papermaking, or a combination of both.

[0047] Although not shown, a coating layer may be provided by applying and drying a coating liquid to the waterproof paper 10. Fillers used in the coating layer include inorganic pigments such as clay, calcium carbonate, titanium dioxide, talc, aluminum hydroxide, magnesium hydroxide, and kaolin, and organic pigments including urea resin, styrene resin, and methacrylic acid resin.

[0048] Examples of binders used in the coating layer include water-insoluble resins and water-soluble resins, but from the viewpoint of improving water resistance, a water-insoluble binder is preferred. Examples of water-insoluble binders include styrene-butadiene copolymers, acrylonitrile-butadiene copolymers, methacrylic acid-butadiene copolymers, polyurethanes, acrylic acid ester copolymers, styrene-acrylic acid ester copolymers, polyvinyl acetate, and ethylene-vinyl acetate copolymers. These may be used alone or in combination of two or more.

[0049] The waterproof paper 10 is preferably a base paper to which a wet strength agent has been added, and more preferably a base paper to which a wet strength agent has been added and to which a coating layer has been provided on at least one side.

[0050] By using the above-mentioned waterproof paper 10 in the paper label laminate 1, no petroleum-derived plastic film is used, making it less expensive than ordinary adhesive sheets that use plastic film, and water does not seep in through gaps on the sides like with paper to which a plastic film is attached. This allows for the paper label laminate 1 to be used for a long period of time. Furthermore, although many of the water-resistant agents added during or after the papermaking process are petroleum-derived, the content in the entire paper label laminate 1 is much less than if a plastic film were used as is, making it possible to obtain an environmentally friendly, carbon-neutral paper label laminate 1.

[0051] (First cellophane layer 20, second cellophane layer 30)

[0052] The first cellophane layer 20 and the second cellophane layer 30 (hereinafter sometimes collectively referred to as "cellophane layers 20, 30") are layers containing cellophane.

[0053] The cellophane used for the cellophane layers 20 and 30 can be regular cellophane (PT) or moisture-proof cellophane (MST). Regular cellophane can typically contain 70 to 90% by mass of recycled fiber, 2 to 20% by mass of alcohols, and 6 to 15% by mass of water. Moisture-proof cellophane can be regular cellophane that has been moisture-proof treated on at least one surface or both surfaces, but it is preferable that regular cellophane have been moisture-proof treated on both surfaces.

[0054] Among these, it is preferable that at least one of the first cellophane layer 20 and the second cellophane layer 30 contains moisture-proof cellophane, and it is more preferable that both the first cellophane layer 20 and the second cellophane layer 30 contain moisture-proof cellophane. Specifically, it is more preferable that the cellophane used in the first cellophane layer 20 and the second cellophane layer 30 are the same moisture-proof cellophane.

[0055] A specific example of moisture-proof cellophane is preferably moisture-proof cellophane coated on one or both sides with at least one resin selected from the group consisting of (i) acrylic resin, (ii) vinyl chloride resin, (iii) vinyl acetate resin, (iv) polyvinylidene chloride resin, and (v) vinyl chloride resin and vinyl acetate resin. Coating moisture-proof cellophane with a highly transparent acrylic resin not only improves moisture resistance and abrasion resistance, but also prevents a decrease in the visibility of letters, pictures, etc. printed on the waterproof paper 10. Examples of such moisture-proof cellophane that can be used include commercially available products manufactured by Futamura Chemical Co., Ltd., such as "AZ-1" (moisture-proof cellophane coated on both sides with acrylic resin), "G-1" (moisture-proof cellophane coated on both sides with vinyl chloride resin and vinyl acetate resin), "G-3" (moisture-proof cellophane coated on both sides with vinyl chloride resin and vinyl acetate resin), and "G-8" (moisture-proof cellophane coated on both sides with polyvinylidene chloride resin).

[0056] The thickness of the cellophane layers 20, 30 is not particularly limited, but is preferably 10 to 50 μm. The lower limit of this thickness is more preferably 15 μm or more, and even more preferably 18 μm or more. The upper limit of this thickness is more preferably 45 μm or less, even more preferably 30 μm or less, and even more preferably 25 μm or less.

[0057] The haze value of the cellophane layers 20, 30 is not particularly limited, but is preferably 5% or less. This provides the paper label laminate 1 with sufficient transparency, allowing the visibility of the printed display surface applied to the waterproof paper 10 or the like to be maintained at a high level. This haze value can be measured, for example, using a haze meter (for example, the haze meter "NDH 2000" manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K 7136:2000.

[0058] The first cellophane layer 20 and the second cellophane layer 30 may have the same or different configurations, but preferably have the same configuration from the viewpoint of standability. Cellophane is a material that shrinks greatly due to heat and humidity, and by covering both sides of the waterproof paper 10 with cellophane having the same shrinkage rate, the front (first surface) and back (second surface) of the waterproof paper 10 will shrink with the same shrinkage force. This is because it is possible to effectively prevent the waterproof paper 10 from tilting toward either surface.

[0059] (First adhesive layer 40, second adhesive layer 50)

[0060] The first adhesive layer 40 and the second adhesive layer 50 (hereinafter sometimes collectively referred to as "adhesive layers 40, 50") can be provided by applying an adhesive composition containing an adhesive to one side of the waterproof paper 10.

[0061] Examples of adhesives used in the adhesive layers 40, 50 include natural rubber adhesives, synthetic rubber adhesives, acrylic resin adhesives, polyvinyl ether resin adhesives, urethane resin adhesives, and silicone resin adhesives.

[0062] Specific examples of synthetic rubber-based adhesives include styrene-butadiene rubber, polyisobutylene rubber, isobutylene-isoprene rubber, isoprene rubber, styrene-isoprene block copolymer, styrene-butadiene block copolymer, styrene-ethylene-butylene block copolymer, and ethylene-vinyl acetate thermoplastic elastomer.

[0063] Specific examples of acrylic resin-based pressure-sensitive adhesives include homopolymers or copolymers of (meth)acrylic acid; (meth)acrylic acid esters such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, and butyl (meth)acrylate; (meth)acrylic acid ester copolymers such as styrene-(meth)acrylic acid ester copolymers; and homopolymers or copolymers of acrylonitrile, etc.

[0064] Specific examples of urethane resin-based adhesives include polyurethane polyols.

[0065] Specific examples of polyvinyl ether resin-based adhesives include polyvinyl ether and polyvinyl isobutyl ether.

[0066] A specific example of the silicone resin-based adhesive is dimethylpolysiloxane.

[0067] These adhesives may be used alone or in combination of two or more.

[0068] Examples of the form of the pressure-sensitive adhesive include solvent-based pressure-sensitive adhesives, emulsion-based pressure-sensitive adhesives, and solventless pressure-sensitive adhesives such as hot-melt-based pressure-sensitive adhesives.

[0069] Furthermore, if necessary, the adhesive layers 40, 50 may contain a tackifier, a softener, an antioxidant, a filler, a colorant such as a dye or a pigment, a crosslinking agent, etc. In particular, the adhesive layers 40, 50 are preferably formed from an adhesive composition containing an adhesive and a tackifier.

[0070] Examples of tackifiers include rosin resins, terpene phenol resins, terpene resins, aromatic hydrocarbon-modified terpene resins, petroleum resins, coumarone-indene resins, styrene-based resins, phenol-based resins, xylene resins, etc. Among these, it is preferable to use one or more selected from rosin resins and terpene resins, which are plant-derived resins.

[0071] By including one or more types of tackifier selected from plant-derived resins such as rosin resin and terpene resin, the degree of plastic-free adhesive layers 40, 50 is improved. This reduces the content of petroleum-derived materials in the paper label laminate 1 as a whole, making it possible to obtain a carbon-neutral paper label laminate 1 that is environmentally friendly.

[0072] Examples of the softener include process oil, liquid rubber, and plasticizer.

[0073] Examples of fillers include silica, talc, clay, and calcium carbonate.

[0074] The thickness of the adhesive layers 40, 50 is not particularly limited, but is preferably 5 to 100 μm. The lower limit of this thickness is more preferably 10 μm or more, and even more preferably 15 μm or more. The upper limit of this thickness is more preferably 50 μm or less, and even more preferably 30 μm or less.

[0075] The adhesive strength of the adhesive layers 40, 50 is not particularly limited, but is preferably 1 to 50 N / 25 mm. The lower limit of this adhesive strength is more preferably 2 N / 25 mm or more, and even more preferably 4 N / 25 mm or more. Note that this adhesive strength is measured in accordance with JIS Z 0237:2009, when a test piece is peeled at an angle of 180° at a peel rate of 300 mm / min.

[0076] The first adhesive layer 40 and the second adhesive layer 50 may have the same configuration or different configurations, but from the viewpoint of standing ability, it is preferable that they have the same configuration.

[0077] FIG. 2 is a cross-sectional view of a paper label laminate according to the second embodiment.

[0078] The paper label laminate 2 further includes a third adhesive layer 70 laminated on the second cellophane layer 30 of the paper label laminate 1 according to the first embodiment, and a release paper 60 laminated on the third adhesive layer 70. That is, the paper label laminate 2 differs from the paper label laminate 1 according to the first embodiment in that the third adhesive layer 70 and release paper 60 are further laminated on the surface of the second cellophane layer 30. In other respects, the same explanation as given for the paper label laminate 1 according to the first embodiment above can be adopted as appropriate.

[0079] The paper label laminate 2 is a laminate formed by laminating, from top to bottom in Figure 2, a first cellophane layer 20, a first adhesive layer 40, waterproof paper 10, a second adhesive layer 50, a second cellophane layer 30, a third adhesive layer 70, and a release paper 60.

[0080] (Release paper 60)

[0081] Examples of the release substrate of the release paper 60 include resin materials, paper, etc. As the release paper 60, for example, a release substrate having one side subjected to a release treatment can be used.

[0082] Examples of resin materials include polyester, polyolefin, polyvinyl chloride, acetyl cellulose butyrate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polystyrene, polycarbonate, polymethylpentene, polysulfone, polyether ether ketone, polyether sulfone, polyetherimide, polyamide, polyimide, fluorine-based resin, acrylic resin, norbornene-based resin, and cycloolefin-based resin. Examples of polyester include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Examples of polyolefin include polyethylene and polypropylene. When such resin materials are used, they can be used as plastic films.

[0083] Examples of the paper include synthetic paper, fine paper, clay-coated paper, kraft paper, glassine paper, and laminated paper.

[0084] Among these, from the viewpoint of reducing the environmental load, the release substrate is preferably paper.

[0085] The release paper 60 is preferably a release paper in which a release treatment is applied to a release substrate using a release treatment agent. The release treatment agent is not particularly limited, and known agents can be used. Specific examples of release treatment agents include silicone, long-chain alkyl resins, and fluorine-based resins.

[0086] When the above-mentioned paper is used as the release substrate, the release paper 60 can be a laminated paper obtained by laminating paper with polyethylene resin or the like.

[0087] When the above-mentioned resin material is used as the release substrate, a release treatment agent is applied to the release substrate, and the release layer is provided by heat curing, ultraviolet curing, or the like to form the release paper 60.

[0088] The thickness of the release paper 60 is not particularly limited, but is preferably 10 to 300 μm. The lower limit of the thickness is more preferably 15 μm or more. The upper limit of the thickness is more preferably 200 μm or less.

[0089] (Third adhesive layer 70)

[0090] The third adhesive layer 70 is disposed between the release paper 60 and the second cellophane layer 30. The type of adhesive constituting the third adhesive layer 70 is not particularly limited, and a suitable type can be selected as appropriate taking into consideration the intended use, etc. As the adhesive, the components described above for the first adhesive layer 40 and the second adhesive layer 50 can also be used. Examples of adhesives for the third adhesive layer 70 include acrylic adhesives, polyester adhesives, urethane adhesives, rubber adhesives, and silicone adhesives. Among these, acrylic adhesives are preferred.

[0091] The thickness of the third adhesive layer 70 is not particularly limited, but is preferably 5 to 200 μm. The lower limit of the average thickness is more preferably 10 μm or more. The upper limit of the average thickness is more preferably 100 μm or less, and even more preferably 50 μm or less.

[0092] The paper label laminates 1 and 2 according to the present embodiment described above can be suitably used as POP labels by providing a printed display surface by printing on the waterproof paper 10 or the cellophane layers 20 and 30. For example, they can be attached to products and used to display information to users and consumers. There are no particular limitations on the objects to which they can be attached, and they can be applied to various products (containers, packaging, etc.) such as food and cosmetics.

[0093] For printing, suitable ink and printing method can be adopted depending on the material of the printing object (for example, waterproof paper 10, cellophane layers 20, 30).

[0094] The content, shape, size, pattern, etc. of the print are not particularly limited, and any desired shape, size, etc. can be selected. Examples of the shape of the printed portion include those that constitute and display information such as letters, figures, symbols, pictures, patterns, etc. Furthermore, the print may be, for example, a solid print layer using a single color ink.

[0095] Although not shown, other functional layers may be provided as needed in addition to the waterproof paper 10, the cellophane layers 20 and 30, and the release paper 60. For example, a protective layer containing a coating agent or an ultraviolet absorber, or a barrier layer that prevents migration to other layers may be provided separately.

[0096] The shape and size of the paper label laminates 1 and 2 are not particularly limited, and a suitable shape can be selected depending on the application.

[0097] <Method of manufacturing paper label laminates 1 and 2>

[0098] The paper label laminate 1 of this embodiment can be suitably obtained by a method for manufacturing a paper label laminate, which includes, for example, the steps of: (1) laminating a first cellophane layer 20 onto a first surface of waterproof paper 10 that has been subjected to a water-resistant treatment, via a first adhesive layer 40, to obtain a laminate; and (2) laminating a second cellophane layer 30 onto a second surface, opposite the first surface of the waterproof paper 10, via a second adhesive layer 50, to obtain the paper label laminate 1.

[0099] In step (1), for example, the adhesive composition constituting the second adhesive layer 50 described above is applied to a release paper, and the waterproof paper 10 is laminated onto the resulting adhesive layer 50. Then, printing is performed on the surface of the waterproof paper 10 opposite the second adhesive layer 50, making the first surface the printed display surface, and a laminate (first laminate) having a waterproof paper 10 / second adhesive layer 50 / release paper configuration is obtained. Next, the adhesive composition constituting the first adhesive layer 40 described above is applied to another release paper, and cellophane constituting the first cellophane layer 20 is laminated onto the resulting adhesive layer 40, resulting in a laminate (second laminate) having a first cellophane layer 20 / first adhesive layer 40 / release paper configuration. Next, the release paper of the second laminate is peeled off, and the exposed first adhesive layer 40 is laminated onto the printed display surface of the waterproof paper 10 of the first laminate. This makes it possible to obtain a laminate having a structure of first cellophane layer 20 / first adhesive layer 40 / water-resistant paper 10 / second adhesive layer 50 / release paper.

[0100] As the pressure-sensitive adhesive composition, those containing the above-mentioned pressure-sensitive adhesive, tackifier, softener, antioxidant, filler, colorant, etc. can be suitably used. Furthermore, if necessary, the pressure-sensitive adhesive composition can be diluted with a solvent to form a coating liquid.

[0101] Examples of the solvent include alcohols (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-methyl-1-propanol, 2-butanol, 2-methyl-2-propanol, diacetone alcohol, benzyl alcohol, etc.), ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (diethyl ether, dioxane, tetrahydrofuran, etc.), cellosolves (methyl cellosolve, ethyl cellosolve, etc.), esters (ethyl acetate, n-butyl acetate, ethyl butyrate, n-butyl glycolate, diethylene glycol monoacetate, etc.), halogenated hydrocarbons (chloroform, dichloromethane, tetrachloroethylene, carbon tetrachloride, etc.), and hydrocarbons (n-hexane, cyclohexane, toluene, xylene, Solvesso, etc.).

[0102] In step (2), for example, the release paper of the laminate obtained in step (1) is peeled off, and cellophane constituting the second cellophane layer 30 is laminated onto the exposed second adhesive layer 50. This makes it possible to obtain a paper label laminate 1 (see FIG. 1) having a configuration of first cellophane layer 20 / first adhesive layer 40 / water-resistant paper 10 / second adhesive layer 50 / second cellophane layer 30.

[0103] Furthermore, the paper label laminate 2 of this embodiment can be obtained by laminating a release paper 60 via a third adhesive layer 70 on the surface of the second cellophane layer 30 of the above-mentioned paper label laminate 1 (the surface opposite to the surface on which the second adhesive layer 50 is laminated), thereby obtaining a paper label laminate 2 (see Figure 2) having a configuration of first cellophane layer 20 / first adhesive layer 40 / water-resistant paper 10 / second adhesive layer 50 / second cellophane layer 30 / third adhesive layer 70 / release paper 60.

[0104] The method for applying the pressure-sensitive adhesive composition in steps (1) and (2) is not particularly limited, and any known method can be selected. Examples include bar coating, knife coating, roll coating, blade coating, die coating, gravure coating, and melt extrusion. After application, a drying step may be performed, if necessary, to form the pressure-sensitive adhesive layers 40 and 50. In the drying step, for example, heating may be performed at a temperature that can volatilize the above-mentioned solvent. Alternatively, if necessary, a predetermined curing period may be allowed after application.

[0105] After step (2), if necessary, processing such as cutting the periphery of the paper label laminate 2, or scrap removal (scrap removal) may be performed, such as rolling up unnecessary adhesive paper or removing scraps. [Example]

[0106] The present invention will be explained in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples in any way.

[0107] Unless otherwise specified, the treatments and measurements in the present examples were carried out in an environment of 23°C and a relative humidity of 50%.

[0108] <Evaluation method>

[0109] (MD wet tensile strength, CD wet tensile strength, and wet tensile strength ratio) The MD and CD measurements of the samples were performed in accordance with JIS P 8135:1998. Specifically, the samples were conditioned for at least 4 hours at 23°C (±1°C) and 50% (±2%) RH, then cut to a size of 15 mm x 250 mm to prepare test specimens. These specimens were heated at 120°C for 2 minutes and immediately immersed in ion-exchanged water for 5 minutes. The specimens were then removed and placed on filter paper. Another filter paper was placed on top of the specimen and gently pressed to remove excess water. A tensile test was then immediately performed using a tensile tester (Toyo Seiki Co., Ltd., "Strograph ES") at a speed of 150 mm / min with a chuck distance of 180 mm. The maximum load required to break the specimen was recorded. The average value of two specimens in each of the CD and MD directions was calculated and used as the wet tensile strength.

[0110] (Thickness) The thickness of the sample was measured at 10 equally spaced points using a constant pressure thickness measuring instrument in accordance with JIS K 7130:1999, and the arithmetic mean of the measured values ​​was taken as the thickness.

[0111] (Haze value) The haze of the sample was measured in accordance with JIS K 7136:2000 using a haze meter (Nippon Denshoku Industries Co., Ltd., haze meter "NDH 2000").

[0112] (Orthostatic stand-up under high temperature and humidity) A paper label laminate having the configuration of paper label laminate 2 shown in Figure 2 was used as a sample. This was cut to a size of 50 mm x 50 mm, and only a 25 mm x 50 mm portion of release paper 60 was peeled off. The exposed surface of adhesive layer 70 was attached to a PET plate and stood at a 90-degree angle. In this state, it was left to stand in an environment of 40°C and 80% RH for 7 days. After that, whether the top of the sample could maintain its upright state was judged based on the following criteria. If the angle of the sample attached to the PET plate at a 90-degree angle was between 90 degrees and 80 degrees, it was judged as "Good." For example, if the angle of the sample was 90 degrees, it could be said that the sample was able to maintain an upright position from the PET plate. If the apex of the sample attached to the PET plate set at an angle of 90 degrees was less than 80 degrees and greater than 60 degrees, it was judged as "△". If the apex of the sample attached to the PET plate set at an angle of 90 degrees was less than 60 degrees, it was judged as "X".

[0113] (Abrasion resistance) The sample was rubbed 100 times with a cotton cloth (JIS L 0803:2011) at a load of 500 g using a friction tester type II conforming to JIS L 0849:2013. The sample surface was then visually observed, and the abrasion resistance was evaluated based on the following criteria. If the ink loss was 0% (no loss), the result was judged as "Good." If the ink loss was 10% or less by mass, it was judged as "Fair." If the ink loss was more than 10% by mass, it was judged as "X".

[0114] Example 1

[0115] First, adhesive layer a was prepared as follows: An acrylic adhesive composition was applied to a release paper to a thickness of 25 μm. The applied layer was then heated at 100°C for 3 minutes to form a coating film of the adhesive composition, yielding adhesive layer a (thickness 25 μm, adhesive strength 11.5 N / 25 mm).

[0116] Next, the adhesive layer a was coated with waterproof paper a (manufactured by Lintec Corporation, wet tensile strength in the MD direction: 3.4 kN / m, wet tensile strength in the CD direction: 1.9 kN / m, ratio of wet tensile strength in the MD direction to wet tensile strength in the CD direction (MD / CD): 1.8, basis weight: 100 g / m 2 A waterproof paper having a coating layer containing kaolin, styrene-butadiene resin, oxidized starch, and polyamine resin was laminated on one side of base paper to which polyamine resin had been added as a wet strength agent, to obtain a laminate (first laminate) having a configuration of waterproof paper a (water-resistant paper 10) / adhesive layer a (second adhesive layer 50) / release paper.

[0117] Next, an acrylic adhesive composition was applied to another release paper to a coating thickness of 25 μm and heated at 100°C for 3 minutes to form a coating film of the adhesive composition. The resulting adhesive layer a (thickness 25 μm, adhesive strength 11.5 N / 25 mm) was coated with cellophane a (moisture-proof cellophane coated on both sides with an acrylic resin, manufactured by Futamura Chemical Co., Ltd., product name "AZ-1", haze value 5% or less, basis weight 20 g / m 2 , 21 μm thick) was laminated on the cellophane a (first cellophane layer 20) / adhesive layer a (first adhesive layer 40) / release paper to obtain a laminate (second laminate) having a structure of cellophane a (first cellophane layer 20) / adhesive layer a (first adhesive layer 40) / release paper.

[0118] Then, printing was applied to one surface (first surface) of the waterproof paper a to provide a printed display surface. Thereafter, the release paper of the second laminate was peeled off, and the exposed adhesive layer a (first adhesive layer 40) was laminated onto the printed display surface of the waterproof paper a, thereby obtaining a laminate having a configuration of cellophane a (first cellophane layer 20) / adhesive layer a (first adhesive layer 40) / water-resistant paper a (water-resistant paper 10) / adhesive layer a (second adhesive layer 50) / release paper.

[0119] Thereafter, the release paper was peeled off from the obtained laminate, and cellophane a (manufactured by Futamura Chemical Co., Ltd., trade name "AZ-1", haze value 5% or less, basis weight 20 g / m) was applied to the exposed adhesive layer a (second adhesive layer 50). 2 , 21 μm thick) was laminated to obtain a paper label laminate A (see Figure 1) having a structure of cellophane a (first cellophane layer 20) / adhesive layer a (first adhesive layer 40) / water-resistant paper a (water-resistant paper 10) / adhesive layer a (second adhesive layer 50) / cellophane a (second cellophane layer 30).

[0120] Next, an acrylic adhesive composition was applied to the release paper 60 to a coating thickness of 25 μm and heated at 100°C for 3 minutes to form a coating film of the adhesive composition.The surface (the surface opposite to the surface on which the second adhesive layer 50 was laminated) of cellophane a (second cellophane layer 30) of the paper label laminate A was laminated onto the resulting adhesive layer a (third adhesive layer 70), thereby obtaining a paper label laminate A1 (see Figure 2) having a configuration of first cellophane layer 20 / first adhesive layer 40 / water-resistant paper 10 / second adhesive layer 50 / second cellophane layer 30 / third adhesive layer 70 / release paper 60.

[0121] <Example 2>

[0122] The waterproof paper a was compared with the waterproof paper b (manufactured by Lintec Corporation, product name "Suihaku", wet tensile strength in the MD direction 1.6 kN / m, wet tensile strength in the CD direction 0.8 kN / m, wet tensile strength ratio in the MD direction to the wet tensile strength in the CD direction (MD / CD) 2.0, basis weight 83 g / m 2 A paper label laminate A2 was obtained in the same manner as in Example 1, except that the above-mentioned step (1) was changed to the above-mentioned step (2).

[0123] Example 3 Cellophane a was replaced with cellophane b (moisture-proof cellophane coated on both sides with polyvinylidene chloride resin, manufactured by Futamura Chemical Co., Ltd., product name "G-8", haze value 5% or less, basis weight 20 g / m 2 A paper label laminate A3 was obtained in the same manner as in Example 1, except that the thickness was changed to 21 μm.

[0124] <Comparative Example 1>

[0125] By laminating cellophane a onto one surface (first surface) of waterproof paper a via the above-mentioned adhesive layer, a laminate B having a structure of cellophane a / adhesive layer a / waterproof paper a / adhesive layer a / release paper was obtained.

[0126] <Comparative Example 2>

[0127] A release paper was laminated on the surface of the waterproof paper a via the adhesive layer described above, thereby obtaining a laminate C having a structure of waterproof paper a / adhesive layer a / release paper.

[0128] <Comparative Example 3>

[0129] Instead of waterproof paper a, woodfree paper a (wet tensile strength in MD direction 0.3 kN / m, wet tensile strength in CD direction 0.2 kN / m, basis weight 80 g / m) was used. 2 A laminate D having a structure of cellophane a / adhesive layer a / wood-free paper a / adhesive layer a / cellophane a / adhesive layer a / release paper was obtained in the same manner as in Example 1, except that a cellophane a / adhesive layer a / release paper (100 μm thick) was used.

[0130] <Comparative Example 4> Cellophane a was laminated on one surface (first surface) of waterproof paper a via the adhesive layer a, to obtain a laminate having a waterproof paper a / adhesive layer a / cellophane a configuration. Next, adhesive layer a was formed on release paper, and the surface of this adhesive layer a was bonded to the surface of the cellophane a of the laminate, to obtain laminate E having a waterproof paper a / adhesive layer a / cellophane a / adhesive layer a / release paper configuration.

[0131] Table 1 shows the configuration and evaluation results of each example and comparative example.

[0132] [Table 1]

[0133] From the above, it was at least confirmed that the paper label laminates of Examples 1 to 3 are made of carbon-neutral materials and are environmentally friendly components, yet can maintain high levels of both long-term standability and abrasion resistance under high temperature and humidity conditions. [Explanation of symbols]

[0134] 1, 2: Paper label laminate 10:Water-resistant paper 20: (First) cellophane layer 30: (Second) cellophane layer 40: (first) adhesive layer 50: (Second) adhesive layer 60: Release paper 70: Third adhesive layer

Claims

1. Waterproof paper that has been treated to be water-resistant, a first adhesive layer laminated on a first surface of the waterproof paper; a first cellophane layer laminated on the first adhesive layer; a second adhesive layer laminated to a second surface of the waterproof paper opposite the first surface; a second cellophane layer laminated on the second adhesive layer; Including, the first cellophane layer and the second cellophane layer both contain moisture-proof cellophane; Paper label laminate.

2. The wet tensile strength of the waterproof paper in the MD direction is 1.0 to 3.5 kN / m. The paper label laminate of claim 1 .

3. The wet tensile strength of the waterproof paper in the CD direction is 0.5 to 2.0 kN / m. The paper label laminate according to claim 1 or 2.

4. a third adhesive layer laminated on the second cellophane layer of the paper label laminate; a release paper laminated on the third adhesive layer; The paper label laminate according to any one of claims 1 to 3, further comprising:

5. a step of laminating a first cellophane layer onto a first surface of the waterproof paper that has been subjected to a waterproofing treatment, via a first adhesive layer, to obtain a laminate; a step of laminating a second cellophane layer on a second surface of the waterproof paper opposite to the first surface, via a second adhesive layer, to obtain a paper label laminate; Including, the first cellophane layer and the second cellophane layer both contain moisture-proof cellophane; A method for manufacturing a paper label laminate.

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