JP4704875B2 - Brittle label - Google Patents

Description

  The present invention relates to a brittle label having a punch-like shape.

  2. Description of the Related Art Conventionally, for the purpose of preventing the contents stored in a container or the like from being tampered with, a method of sealing the container or the like with a brittle label that easily breaks when opened is used. These brittle labels can be recognized as being peeled off when the label is peeled off from the adherend such as a container to which the label is attached. It is used as a label to guarantee that there is no.

  In Japanese Patent Publication No. 6-35237, an adhesive layer 10, a metal vapor-deposited film (solvent-soluble film layer 50 / metal vapor-deposited layer 40), and a printed layer 20 made of an image line are laminated in this order on one side of the release layer 30. Using the laminate [FIG. 7 (b)], a solvent is administered to the surface of the printed layer 40 of the laminate to dissolve and remove the metal vapor-deposited film and the adhesive layer at the non-image-given portion, thereby providing a clear image line. It is described that a method for producing the transfer sheet shown in FIG. 7 (a) and that the transfer sheet can provide a clear image line. When a brittle label is produced using the above method, an expensive film (solvent-soluble film layer 50) that is brittle and has a property of being dissolved in a solvent is required, which is disadvantageous in terms of cost. In addition, the adhesive layer 10 that is easily dissolved as compared with the solvent-soluble film layer 50 is greatly eroded [FIG. 7C], and the outline of the label is easily scraped or dropped off. For this reason, the brittle label which expressed the fine outline sharply was not able to be manufactured.

Japanese Examined Patent Publication No. 6-35237

An object of the present invention is to provide a brittle label having sufficient waist and brittleness and having a fine outline clearly displayed.
Another object of the present invention is to provide a brittle label having excellent decorating properties and a clearer outline in addition to the above characteristics.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that a specific layer is sufficient to provide a waist that does not impair the workability of pasting and a fine outline is sharply expressed. The present inventors have found that a quality label can be obtained at a low cost and completed the present invention.

That is, the present invention comprises a laminate of a pressure-sensitive adhesive layer formed of a cross-linkable pressure-sensitive adhesive and a printed layer, the surface of the pressure-sensitive adhesive layer is protected with a release paper, and the release paper is Provided is a label that is peeled off and attached to an adherend, and is brittle and breakable when peeled from the adherend . The brittle label may further have a foil transfer layer between the pressure-sensitive adhesive layer and the printing layer .

The present invention also comprises a laminate of a solvent-soluble pressure-sensitive adhesive layer formed of a crosslinkable and solvent-soluble pressure-sensitive adhesive and a solvent-insoluble printing layer formed of an ultraviolet curable ink. The adhesive layer surface is protected with a release paper, is a label that is peeled off the release paper and affixed to an adherend, and a method for producing a brittle label that can be brittlely destroyed when peeled from the adherend , After printing a cross-linked and solvent-soluble adhesive on one side of the release paper, it is cross-linked by heating or irradiation with ultraviolet rays or electron beams to form a solvent-soluble adhesive layer. A laminate in which a solvent-insoluble printing layer is formed by printing with UV curable ink, and a release paper, a solvent-soluble pressure-sensitive adhesive layer, and a solvent-insoluble printing layer formed on a portion other than the punched portion are laminated in this order. Make , The solvent is brought into contact with the laminate, by dissolving and removing the solvent-soluble adhesive layer corresponding to the vent sites, comprising forming a punching-like shape composed of the remainder of the solvent-soluble adhesive layer and a solvent-insoluble print layer A method for producing a brittle label is provided.

  The manufacturing method of the brittle label of the present invention is such that a release paper, a solvent-soluble adhesive layer, a foil transfer layer, and a solvent-insoluble printing layer formed in a region other than the punched portion are contacted with a solvent in this order. And removing the foil transfer layer and the solvent-soluble adhesive layer corresponding to the punched portion to form a punch-like shape consisting of the remaining foil transfer layer, the solvent-soluble adhesive layer, and the solvent-insoluble printing layer. You may go out.

  In the present specification, a laminate having a “punching-like shape” means that a part of the laminate is dissolved and removed, and the layers constituting the laminate (such as an adhesive layer and a printing layer) have a common contour. This means that it has an appearance similar to that of a punched product that has been punched into a pattern (such as etching). “Punched site” indicates a site to be dissolved and removed in the laminate used for forming the above “punched-like shape”. The phrase “brittle fracture is possible at the time of peeling” means that the label has brittleness and is configured with a fine outline, so that peeling is difficult or impossible when peeling.

  Since the brittle label of the present invention comprises an adhesive layer and a printing layer and does not require a special film, it can clearly represent the fine contours forming a punch-like shape. According to the method for producing a brittle label of the present invention, there is no special film having a lower solvent solubility than the pressure-sensitive adhesive layer, and since the total thickness is reduced, the pressure-sensitive adhesive layer is not easily subjected to excessive erosion, and the outline of the label is reduced. It can prevent sharpening and falling off and form a fine outline sharply. Furthermore, the brittle label excellent in decorating property can be obtained by providing a foil transfer layer between the adhesive layer and the printed layer.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of a brittle label of the present invention. The brittle label in FIG. 1 has a punch-like shape, and is composed of a laminate of the pressure-sensitive adhesive layer 1 and the print layer 2, and the surface of the pressure-sensitive adhesive layer 1 in the laminate is protected by the release paper 3.

  The pressure-sensitive adhesive layer 1 in the present invention is formed of a cross-linked pressure-sensitive adhesive. For this reason, a label can be provided with a three-dimensional crosslinked structure. As such an adhesive, for example, an acrylic adhesive, a urethane adhesive, a rubber adhesive, or the like can be used. These pressure-sensitive adhesives can be used in any form such as aqueous (or emulsion), solvent-based, and hot melt. Of these, water-based adhesives that are excellent in application workability and inexpensive are often used. These pressure-sensitive adhesives can be used alone or in combination of two or more. The pressure-sensitive adhesive layer 1 may be either a single layer or a plurality of layers.

  In the present invention, when the pressure-sensitive adhesive layer 1 is formed of a solvent-soluble pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, or the like is preferably used as the solvent-soluble pressure-sensitive adhesive.

The acrylic pressure-sensitive adhesive contains an acrylic polymer as a base polymer. Monomers used as raw materials for acrylic polymers include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, butyl methacrylate, 2-ethylhexyl methacrylate, methacrylic acid. Examples include (meth) acrylic acid alkyl esters such as (meth) acrylic acid C _1-18 alkyl esters such as octyl acid. These (meth) acrylic acid alkyl esters can be used alone or in combination of two or more. Moreover, you may use together the 1 type (s) or 2 or more types of this (meth) acrylic-acid alkylester as a main monomer, and the other monomer copolymerizable with this.

  Representative examples of the copolymerizable monomer include carboxyl group-containing ethylenically unsaturated monomers such as (meth) acrylic acid, crotonic acid, itaconic acid, maleic acid, and fumaric acid. Among these, a particularly suitable monomer is acrylic acid. The carboxyl group-containing ethylenically unsaturated monomer is a necessary component for causing a cross-linking bond in the polymer.

  Examples of the copolymerizable monomer include vinyl esters such as vinyl acetate, styrene monomers such as styrene, cyano group-containing monomers such as acrylonitrile, and acrylics such as cyclic or acyclic (meth) acrylamides. Any of various types of monomers known as modifying monomers for pressure sensitive adhesives can be used.

  In the present invention, a polyfunctional monomer is further copolymerized for the purpose of improving the hardness of the label. Polyfunctional monomers include diethylene glycol diacrylate, diethylene glycol dimethacrylate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, tetraethylene glycol diacrylate, tetraethylene glycol dimethacrylate, neopentyl glycol diacrylate, neopentyl glycol dimethacrylate, 1, Trifunctional such as bifunctional (meth) acrylate such as 6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate ( (Meth) acrylate, dipentaerythritol hexamethacrylate Polyfunctional (meth) acrylates such as 6-functional (meth) acrylate over preparative like; polyfunctional aromatic vinyl compounds such as divinylbenzene and the like. Among these, from the viewpoint that the hardness due to three-dimensional crosslinking and the cohesiveness and adhesiveness of the pressure-sensitive adhesive can be imparted in a balanced manner, in particular, a bifunctional to trifunctional (meth) acrylate is preferably used. The amount of these copolymerizable monomers is preferably 50% by weight or less with respect to the total amount of monomer components including the main monomer, from the viewpoint of adhesive performance. When the ratio of the polyfunctional monomer is too large, the adhesive strength is remarkably reduced.

  By appropriately selecting the types and combinations of the above monomer components and polymerizing them by a conventional method, it is possible to obtain an acrylic polymer that has excellent adhesion and cohesiveness and can be sufficiently raised. it can. Typical acrylic pressure-sensitive adhesives include trade name “Cybinol AT-27” (cross-linked water-based pressure-sensitive adhesive) manufactured by Seiden Chemical Co., Ltd., and trade name “Ultrazol W-200” manufactured by Gantz Kasei Co., Ltd. Type water-based pressure-sensitive adhesive), product name “PAT1” manufactured by Lintec Co., Ltd. (cross-linking solvent-based pressure-sensitive adhesive) and the like are commercially available.

  The weight average molecular weight of the polymer (after crosslinking) constituting the pressure-sensitive adhesive layer 1 is not particularly limited, but is, for example, 10,000 to 100,000, preferably 30,000 to 70,000. If the molecular weight is too small, the adhesive force and cohesive force are poor, and if the molecular weight is too large, the adhesive is too hard and the adhesive force tends to be insufficient. The weight average molecular weight of the polymer can be adjusted by the type and combination of the monomers used and the proportion thereof, the polymerization conditions (type and amount of initiator, chain transfer agent, emulsifier, etc., polymerization temperature, polymerization method, etc.) and the like.

The hardness of the pressure-sensitive adhesive layer 1 can be represented by a gel fraction. The gel fraction is measured according to JIS K 6769. Specifically, the gel fraction in the present invention is determined by the dry weight W ₁ (g) of the pressure-sensitive adhesive after crosslinking, dissolved in a large excess of organic solvent by shaking, and the dry weight of the insoluble matter separated by filtration as W _2. When (g), it is calculated by the following formula. The organic solvent can be appropriately selected according to the type of the base polymer so that the cross-linked portion is almost insoluble. For example, when the base polymer is an acrylic polymer or the like, an ethyl acetate solvent is used.
Gel fraction (% by weight) = (W ₂ / W ₁ ) × 100

  The gel fraction of the pressure-sensitive adhesive layer 1 is, for example, about 10 to 65%, preferably about 30 to 50%. If the gel fraction is less than 10%, there is no waist and the labeling workability tends to be low, and if it exceeds 65%, the flexibility tends to be poor and cracks tend to occur. The gel fraction of the pressure-sensitive adhesive layer 1 can be adjusted by the type of base polymer constituting the pressure-sensitive adhesive layer, the layer thickness, the type of crosslinking agent, and the like.

  The thickness of the pressure-sensitive adhesive layer 1 can be selected, for example, from a range of about 5 to 30 μm, preferably about 6 to 25 μm. If the thickness is less than 5 μm, there is a tendency that the label waist and adhesive strength tend to be insufficient, and if it exceeds 30 μm, it takes time to dry, which is disadvantageous in terms of cost, and handling properties tend to decrease, which is not preferable.

  As the printing ink for forming the printing layer 2, UV ink (ultraviolet curable ink) capable of imparting a good balance between flexibility and hardness is preferably used. The UV ink can be used as a solvent-insoluble printing ink that does not dissolve in the solvent described later or is extremely difficult to dissolve. The UV ink usually contains a vehicle composed of an oligomer component, a monomer component, and a photopolymerization initiator as main components, and optionally includes additives (for example, photopolymerization accelerators, stabilizers, waxes, mist inhibitors). , Colorants, lubricants, drying agents, wetting agents, viscosity improvers, etc.) can be used. UV inks can be used alone or in combination.

  Examples of the oligomer component constituting the vehicle include polyester acrylate, epoxy acrylate, urethane acrylate, polyol acrylate, alkyd acrylate, and polyether acrylate. Of these, polyester acrylate, epoxy acrylate, and the like are preferable. Examples of the monomer component include monofunctional monomers such as 2-hydroxyethyl methacrylate, hydroxybutyl acrylate, dicyclopentadiene acrylate, 1,6-hexanediol monoacrylate, and cyclohexyl acrylate; 1,6-hexanediol Polyfunctional monomers such as diacrylate, neopentyl glycol diacrylate, triethylene glycol diacrylate, ethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, and the like are used. Examples of the photopolymerization initiator include 2-hydroxy-2-methylpropiophenone and 2,2-dimethoxy-2-phenylacetophenone.

  As UV inks preferably used in the present invention, for example, trade name “UV 161” manufactured by T & K TOKA, trade name “SK-2” manufactured by Kuboti Ink, trade name “manufactured by Dainippon Ink & Chemicals, Inc.” “Dycure Scepter DT”, trade name “UV BOP” manufactured by Teikoku Ink Co., Ltd. are commercially available. The print layer 2 may be a single layer or a plurality of layers.

  The printing layer 2 in the present invention is formed in a region other than the punched portion. In addition, when the printing layer 2 is comprised by the several layer, all of these printing layers are the meanings formed in area | regions other than the extraction part.

  The printing layer 2 is printed on a region other than the cut-out portion by a normal printing method (for example, letterpress printing, flexographic printing, gravure printing, screen printing, etc.) using UV ink, and then UV is emitted by an ultraviolet (UV) lamp. Can be formed by irradiating and curing. The hardness of the printing layer 2 can be appropriately adjusted depending on the type and amount of UV ink, the thickness of the layer, and the like.

  The total thickness of the printing layer 2 is appropriately selected according to the hardness of the layer, and is, for example, 1.5 μm or more (about 1.5 to 10 μm), preferably 2 μm or more (about 2 to 5 μm). If the total thickness of the printed layer 2 is too thin, the hardness is insufficient and the handling property of the label is inferior, and if the layer is too thick, it is not preferable because it is not economical. In general, a single printed layer formed of UV ink has a thickness of about 2 μm. For this reason, in this invention, the printing layer 2 of sufficient thickness can be formed using methods, such as printing colorless and transparent UV ink (varnish) etc. in multiple times using the same plate.

  The release paper 3 is a member that protects the pressure-sensitive adhesive surface, is formed of a material that has been given release properties by a release treatment or the like, and a conventional one can be used for the pressure-sensitive adhesive label. As a material for the release paper, for example, paper such as glassine paper, plastic film such as polyethylene terephthalate film, and the like can be used, and these also have solvent resistance. At the time of application to the adherend, the release paper 3 is peeled off and used. In addition, the laminated body which comprises the brittle label of this invention should just have the adhesive layer 1 and the printing layer 2 which have at least a common outline, and the release paper 3 is not an essential component.

  The thickness of the release paper 3 is not particularly limited as long as the handleability is not impaired, and is, for example, about 15 to 300 μm, preferably about 20 to 200 μm.

  The brittle label of the present invention may further contain other layers in addition to the above configuration. Examples of the other layer include a foil transfer layer.

  The total thickness of the brittle label of the present invention may be in a range that can exhibit brittleness, and the thickness of the layer excluding the release paper is usually about 6.5 μm or more (6.5 to 45 μm). If the thickness exceeds 45 μm, it is not suitable for the label of the present invention because it is difficult to cause brittle fracture during peeling. In particular, when the total thickness excluding the release paper and the solvent-insoluble printing layer is about 35 μm or less (for example, 5 to 35 μm), as described later, a specific laminate is treated with a solvent to produce a brittle label. In this case, excessive erosion by the solvent can be prevented, and a clear contour can be formed.

  The brittle label of the present invention can be brittle fractured at the time of peeling. The brittleness of the brittle label can be appropriately set according to, for example, the shape and material of the label, the total thickness of the brittle label (not including the adhesive surface protecting member), and the like.

  The brittle label having the above configuration has excellent workability because the pressure-sensitive adhesive layer itself has sufficient hardness, and can be brittlely broken when peeled because it has a fine outline. Such brittle labels do not require the lamination of a special film that is soluble in a solvent in order to gain a waist, and the outline of the label is hard to be scraped off or dropped off, and fine characters and images that have a punched-out shape are clear. Can be displayed. Moreover, since a special film is unnecessary, it can be manufactured at a low cost in a short time.

  FIG. 2 is a schematic cross-sectional view showing another example of the brittle label of the present invention. The brittle label in FIG. 2 further includes a foil transfer layer 4 between the adhesive layer 1 and the print layer 2 in the brittle label in FIG. Specifically, the brittle label of FIG. 2 has a punched-out shape and is composed of a laminate of the pressure-sensitive adhesive layer 1, the foil transfer layer 4, and the print layer 2, and the pressure-sensitive adhesive layer 1 side in the laminate. Is protected by release paper 3. As the pressure-sensitive adhesive layer 1, the printing layer 2, and the release paper 3, those having the same configuration as in FIG. 1 can be used. A brittle label having such a foil transfer layer 4 is preferably used because it can display the outline of the design more clearly and has excellent decorating properties.

  The foil transfer layer 4 is made of, for example, a metal coating mainly composed of one or more metals such as iron, copper, aluminum, chromium, nickel-chromium alloy, zinc, brass, tin, and pure silver. As the metal coating, for example, a metal foil, a metal vapor-deposited product for transfer, etc. can be used, and these may contain a small amount of materials other than metal, for example, mirror surfaces, holograms, transfer foils and metals, etc. Vapor deposition products can be used.

  The foil transfer layer 4 is usually formed by a method using a transfer foil in which a carrier film, a release layer, and a metal film transfer layer (metal foil, metal vapor deposition layer, etc.) are laminated in this order. According to this method, since a metal film formed by vapor-depositing a metal once on a smooth film surface (carrier film) is transferred, an uneven surface such as the surface of the pressure-sensitive adhesive layer 1 is pressed against the smooth film surface. The foil transfer layer 4 can be smoothly and uniformly laminated on the pressure-sensitive adhesive layer 1. The foil transfer layer 4 thus formed is superior in terms of surface smoothness (gloss) and the like to a metal vapor deposition layer provided directly on the surface of the pressure-sensitive adhesive layer 1 having an uneven surface. The transfer foil may have a layer other than the above as long as a desired punch-like shape can be formed. For example, an adhesive layer on the metal film transfer layer (side in contact with the pressure-sensitive adhesive layer 1). Etc. may have a surface protective layer or the like between the release layer and the metal film transfer layer.

  The foil transfer layer 4 can be formed, for example, by a method such as a cold stamp method and a hot stamp (foil press printing) method using the transfer foil having the above configuration. Of these, the cold stamp method is preferably used. The foil transfer layer 4 is formed, for example, by pressing the metal film transfer layer side of the transfer foil having the above configuration on the surface of the pressure-sensitive adhesive layer 1 provided on one side of the release layer 3, and then releasing the transfer foil. It can be formed by a method in which the foil transfer layer 4 (metal film transfer layer) is transferred (laminated) onto the pressure-sensitive adhesive layer 1 by peeling at the interface between the layer and the metal film transfer layer.

  The foil transfer layer 4 should just be formed in the desired range according to the design of a brittle label. Therefore, the foil transfer layer 4 in the present invention may have a common outline with the pressure-sensitive adhesive layer and the printed layer, but the outline does not need to be completely common with these, and may be partial. Good.

  The thickness of the foil transfer layer 4 is usually about 400 to 1000 mm in the case of a metal vapor-deposited product for transfer, for example, in the case of a metal foil, for example, 0.4 to 5 μm, depending on the type of metal film constituting the layer. Degree. If the layer thickness is too thin, it is difficult to obtain decorative properties, and if it is too thick, it is uneconomical, and the handling properties are inferior because it is difficult to remove the removal site in the solvent treatment step described later. The foil transfer layer 4 may have a configuration in which a surface protective layer (about 0.5 to 3 μm) is laminated on a metal film.

  The brittle label having the above configuration is excellent in decorating properties because it is given a metallic luster, and can display characters and the outline of the design more clearly.

  The brittle label of the present invention may not necessarily have the same outline as the design drawn on the surface. FIG. 5 (a) is a front view showing still another example of the brittle label of the present invention, and (b) is an SS cross-sectional view of (b). The pressure-sensitive adhesive layer 1 and the release layer 3 are the same as described above. The print layer 2 includes a transparent ink layer 21 and a colored ink layer 22. The transparent ink layer 21 can be formed of a transparent UV ink. The colored ink layer 22 can be formed of UV ink containing an appropriate colorant, and may be composed of a single layer or a plurality of layers.

  The brittle labels shown in FIGS. 5 (a) and 5 (b) have the same design C ("P" and "R" in the figure) consisting of two interspersed characters composed of the colored ink layer 22. Are laminated on the transparent ink layer 21 to form one label. As shown in FIG. 5 (b), the pressure-sensitive adhesive layer 1 constitutes the outline D of the label together with the transparent ink layer 21, but the outline is common with the colored ink layer 22 constituting the design C of the label. do not do. That is, the label design C and the label outline D are different. According to the brittle label having such a configuration, a design composed of a plurality of scattered characters and images can be handled as one label when being peeled from the release paper and used.

  The brittle label of the present invention utilizes the property that the label shape is destroyed when it is peeled once applied to the adherend, and a security seal used for sealing a package such as a box for the purpose of guaranteeing unopened goods. It can be suitably used as an anti-counterfeit seal.

  The method for producing a brittle label according to the present invention is a method for producing a brittle label comprising a laminate of a pressure-sensitive adhesive layer and a printing layer, having a punch-like shape, and capable of being brittlely broken at the time of peeling. The solvent-soluble pressure-sensitive adhesive layer and the solvent-insoluble printing layer formed in the region other than the removal site are brought into contact with the laminated body in this order, and the solvent-soluble pressure-sensitive adhesive layer corresponding to the removal site is dissolved and removed. Thus, there is included a step of forming a punched-out shape composed of the remaining solvent-soluble pressure-sensitive adhesive layer and solvent-insoluble printing layer (hereinafter sometimes referred to as “solvent treatment step”).

  FIG. 3 shows an example of a laminate used for manufacturing the brittle label of FIG. In the laminate of FIG. 3, a release paper 3, a solvent-soluble pressure-sensitive adhesive layer 1a, and a solvent-insoluble printing layer 2a formed in a region other than the removal site are laminated in this order. The release paper 3 is the same as described above. The brittle label of FIG. 1 can be produced by treating the laminate of FIG. 3 with a solvent.

  The solvent-soluble pressure-sensitive adhesive layer 1 a can be formed of the pressure-sensitive adhesives constituting the pressure-sensitive adhesive layer 1 as exemplified by the solvent-soluble pressure-sensitive adhesive. The solvent-soluble pressure-sensitive adhesive can be appropriately selected and used according to the type of solvent used for the solvent treatment. For example, the solvent-soluble pressure-sensitive adhesive layer 1a is formed on the release paper 3 by a coating method such as gravure coating or roll coating using a solution or emulsion, a melt extrusion laminating method, or the like according to the type of components of the solvent-soluble pressure-sensitive adhesive. It can be formed by printing (solid coating) on one side and then heating or irradiating light (ultraviolet rays, electron beam, etc.) as necessary to advance the crosslinking reaction.

  The solvent-insoluble printing layer 2a can be formed by a printing method such as flexographic printing or letterpress printing using the UV inks constituting the printing layer 2 as the solvent-insoluble printing ink. The solvent-insoluble printing layer 2a is formed in a region other than the removal site. That is, the solvent-soluble adhesive layer 1a and the solvent-insoluble printing layer 2a have the same contour as the finally obtained brittle label (FIG. 1).

  As the solvent, solvents that can be easily obtained and handled, for example, methyl acetate, ethyl acetate, acetone, methyl ethyl ketone (MEK), isopropyl alcohol (IPA), xylol, lacquer thinner, water and the like are preferably used. The solvent is applied to the surface of the laminate (eg, the surface on the solvent-insoluble printing layer 2a side) using an application means such as a spray or a roller.

  By bringing the solvent into contact with the surface of the laminate shown in FIG. 3, the solvent-soluble pressure-sensitive adhesive layer corresponding to the removal site A is dissolved and removed, and a punch-like shape comprising the remaining solvent-soluble pressure-sensitive adhesive layer and the solvent-insoluble printing layer 1a The brittle label of FIG. 1 with B can be formed. That is, in the laminated body of FIG. 3, the region (A) in which the solvent-insoluble printing layer 2a is not laminated is contacted with the solvent to be dissolved and removed, and the solvent-insoluble printing layer 2a is laminated. By leaving the region (B), a punching-like shape B is formed in which the solvent-insoluble printing layer 2a and the solvent-soluble pressure-sensitive adhesive layer 1a have a common contour.

  According to the method for producing a brittle label of the present invention, the exposed solvent-soluble pressure-sensitive adhesive layer dissolves in the solvent to form a common contour with the solvent-insoluble print layer, and the brittle label clearly displays fine characters and designs. A label can be obtained. Since the brittle label thus obtained has sufficient elasticity, it is not necessary to laminate a special film [for example, the solvent-soluble film layer 50 in FIG. For this reason, it is hard to produce malfunctions, such as a solvent permeating from the side of a layered product, and solvent-soluble adhesive layer 2a dissolving more largely than solvent-insoluble printing layer 1a. Further, since the layer thickness can be reduced, the solvent-soluble pressure-sensitive adhesive layer 1a can be prevented from being excessively dissolved in the solvent, and a fine outline can be formed sharply.

  FIG. 4 shows an example of a laminate used for manufacturing the brittle label of FIG. In the laminate of FIG. 4, a release paper 3, a solvent-soluble adhesive layer 1a, a foil transfer layer 4, and a solvent-insoluble printing layer 2a formed in a region other than the punched portion are laminated in this order. The release paper 3, the solvent-insoluble printing layer 2a, and the solvent-soluble pressure-sensitive adhesive layer 1a are the same as described above. The brittle label of FIG. 2 can be produced by treating the laminate of FIG. 4 with a solvent. The kind of solvent and the method of solvent treatment are the same as above.

  The foil transfer layer 4 can be composed of the metal foil or metal vapor-deposited product exemplified above, and can be formed by the method described above. The foil transfer layer 4 can be provided partially or entirely on the surface of the solvent-soluble pressure-sensitive adhesive layer 1a according to the label design or the like.

  By bringing the solvent into contact with the surface of the laminate of FIG. 4, the foil transfer layer and the solvent-soluble adhesive layer corresponding to the removal site A are dissolved and removed, and the remaining foil transfer layer, the solvent-soluble adhesive layer and the solvent insoluble are removed. The brittle label of FIG. 2 having a stamped-like shape B consisting of a printed layer can be formed. That is, in the laminate of FIG. 4, in the region (A) where the solvent-insoluble printing layer 2a is not laminated, the foil transfer layer 4 comes into contact with the solvent and swells and breaks, and then the solvent-soluble pressure-sensitive adhesive layer 1a in contact with the solvent. Is dissolved and removed. At this time, if necessary, the foil transfer layer 4 swollen in contact with the solvent may be removed by physical means such as rubbing with a brush or the like. Thus, the region (B) where the solvent-insoluble printing layer 2a is laminated remains, so that the solvent-insoluble printing layer 2a, the foil transfer layer 4, and the solvent-soluble pressure-sensitive adhesive layer 1a have a punching-like shape having a common contour. Two brittle labels are formed.

  By the said method, it has a metallic luster and can manufacture the brittle label excellent in the decorating property by which the fine outline was expressed more clearly.

  According to the method of the present invention, it is possible to produce a brittle label having a punched-like shape with sharply formed fine contours, having an appropriate waist when applied, and capable of brittle fracture when peeled. .

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1
On one side of a release paper [polyethylene terephthalate (PET) film having been subjected to a release treatment, thickness 38 μm], a cross-linked acrylic pressure-sensitive adhesive [water-based; trade name “Cybinol AT-27”, manufactured by Syden Chemical Co., Ltd.] It was applied by flexographic printing to form an adhesive layer (thickness after drying 8 μm). On the pressure-sensitive adhesive layer, a transfer film on which a release coat and an aluminum deposition with a deposition thickness of 500 mm are formed is pressed and transferred onto a base film (PET film, thickness 16 μm), and then the design color UV ink [trade name "UV 161", manufactured by T & K TOKA Co., Ltd., flexographically printed, and further printed using transparent UV ink [trade name "UV Gloss OP Varnish", manufactured by T & K TOKA Co., Ltd.] The ink is cured at a UV lamp intensity of 120 W / cm with a UV irradiation device, and a printing layer having a total thickness of about 6 μm is laminated, thereby releasing paper 3 / adhesive layer 1 / foil transfer layer 4 / printing layer (colored ink A laminate comprising layer 22 / transparent ink layer 21) was formed [FIG. 6 (a)].
After the ethyl acetate solvent was administered to the surface of the printed layer (transparent ink layer 21) of the obtained laminate [FIG. 6 (a)] and left for 1 minute, the swollen pressure-sensitive adhesive layer 1 and the swollen pressure-sensitive adhesive layer The foil transfer layer 4 on the upper side was scraped with a brush to remove the extracted portion A, thereby obtaining a brittle label shown in FIG. In the obtained brittle label, a punched-out shape having a fine outline was clearly expressed.

It is a schematic sectional drawing which shows an example of the brittle label of this invention. It is a schematic sectional drawing which shows the other example of the brittle label of this invention. It is a schematic sectional drawing which shows an example of the laminated body used for manufacture of the brittle label of FIG. It is a schematic sectional drawing which shows an example of the laminated body used for manufacture of the brittle label of FIG. (A) is a front view which shows the further another example of the brittle label of this invention, (b) is SS sectional drawing of (a). (A) is a schematic sectional drawing which shows the laminated body used for manufacture of the brittle label of Example 1, (b) shows the brittle label of Example 1 obtained using the laminated body of (b). It is a schematic sectional drawing. (A) is a schematic cross-sectional view showing an example of a conventional label, (B) is a schematic cross-sectional view showing an example of a laminate used in the production of the label (A), It is a partial enlarged view.

Explanation of symbols

1 Adhesive layer
1a Solvent-soluble adhesive layer 2 Print layer
2a Solvent-insoluble printing layer 21 Transparent ink layer 22 Colored ink layer 3 Release paper 4 Foil transfer layer 10 Adhesive layer 20 Printing layer 30 Release paper 40 Metal vapor deposition layer 50 Solvent-soluble film layer A, X Extrusion site B Stamping-like shape C Label Design D Label Outline

Claims (6)

It has a punching-like shape and consists of a laminate of a pressure-sensitive adhesive layer formed of a cross-linkable pressure-sensitive adhesive and a printed layer, and the pressure-sensitive adhesive layer surface is protected with a release paper. A brittle label that is affixed and can be brittlely broken when peeled off from the adherend .   The brittle label according to claim 1, further comprising a foil transfer layer between the pressure-sensitive adhesive layer and the printed layer. The brittle label according to claim 1 or 2 , wherein the pressure-sensitive adhesive layer is a solvent-soluble pressure-sensitive adhesive layer formed of a solvent-soluble pressure-sensitive adhesive, and the printing layer is a solvent-insoluble printing layer formed of an ultraviolet curable ink . The brittle label according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer has a gel fraction (based on JIS K 6769) of 10 to 65%. The pressure-sensitive adhesive layer is formed of an acrylic pressure-sensitive adhesive, and the base polymer of the acrylic pressure-sensitive adhesive is (meth) acrylic acid C _1-18 The brittle label according to any one of claims 1 to 4, which is an acrylic polymer containing an alkyl ester, a carboxyl group-containing ethylenically unsaturated monomer and a polyfunctional monomer as monomer components. It consists of a laminate of a solvent-soluble pressure-sensitive adhesive layer formed of a cross-linkable and solvent-soluble pressure-sensitive adhesive and a solvent-insoluble printing layer formed of UV-curable ink. are protected by paper, a label to be affixed by peeling off the release paper to the adherend, a method for producing a brittle label capable brittle fracture at the time of peeling from the adherend, crosslinked on one surface of the release paper After printing the mold and solvent-soluble pressure-sensitive adhesive, it is cross-linked by heating or irradiation with ultraviolet rays or electron beams to form a solvent-soluble pressure-sensitive adhesive layer. It used to form a solvent-insoluble print layer by printing, release paper, solvent-soluble adhesive layer, and the solvent-insoluble print layer formed on the non-vent site to prepare a laminate formed by laminating in this order, the laminate to the body A brittle label comprising a step of forming a punch-like shape consisting of the remaining solvent-soluble pressure-sensitive adhesive layer and a solvent-insoluble printing layer by contacting the agent and dissolving and removing the solvent-soluble pressure-sensitive adhesive layer corresponding to the removal site Method.

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