JP4684441B2 - Adhesive label - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention can be applied so as to cover both the container cap and the container body filled with the contents, and when it is peeled off after being attached, the fact that it has been peeled off can be easily found and the fact that it has been peeled off The present invention relates to an adhesive label that can prevent the disappearance of the material.
[0002]
[Prior art]
Conventionally, an adhesive label is applied to a container filled with a chemical such as a pharmaceutical or a dangerous substance so as to cover both the container body and the cap in order to prevent contamination. A conventional pressure-sensitive adhesive label is obtained by providing a pressure-sensitive adhesive layer on a paper base material. When the cap is opened, the pressure-sensitive adhesive label is broken, so that it is proved that the cap is opened. However, since this pressure-sensitive adhesive label has the above-mentioned two-layer structure, it can be peeled off from the interface between the pressure-sensitive adhesive layer and the cap, and the peeled pressure-sensitive adhesive label can be reapplied after mixing foreign matter. In that case, there is a problem that the fact of contamination of foreign matters cannot be easily found.
On the other hand, containers filled with contents such as detergents and shampoos are transported and sold with caps on the container outlets to prevent foreign substances from entering. Not done.
In recent years, containers filled with contents such as detergents and shampoos have also been requested to prevent contamination, and the development of pressure-sensitive adhesive labels that can easily detect the fact that it has been peeled off and prevent the fact that it has been peeled off is desired. It was rare.
[0003]
[Problems to be solved by the invention]
In developing this adhesive label, the following points need to be considered in particular.
First, many containers filled with contents such as detergents, shampoos, and oils usually have a smaller outlet than the container body, and the size of the container body is abrupt at the lower end of the closed cap. In many cases, the gradient angle between the cap surface and the container main body surface is about 70 to 90 degrees, so that such a surface where the gradient angle changes abruptly (hereinafter referred to as a three-dimensional curved surface). It is necessary to adhere the adhesive label and maintain the adhesive state for a long period of time.
In addition, the surface of the cap is formed with anti-slip structures such as fine grooves so that the cap can be opened and closed smoothly even when slippery liquid such as detergent, shampoo, oil, etc. adheres to the cap. It is necessary to firmly adhere the adhesive label to such uneven surfaces.
[0004]
Furthermore, in order to apply an adhesive label so as to cover both the cap and the container body of the container to which the cap is attached, many adhesive labels formed in a fixed shape on a continuous release sheet are usually provided, not manually. This is done with a labeling machine that uses an adhesive label sheet and changes the advancing direction of the release sheet abruptly with a release plate, etc., so that a part of the adhesive label is peeled off from the release sheet and attached to the adherend. Therefore, it is necessary to have a labeling characteristic that can reliably peel the adhesive label.
Therefore, the present invention solves the above-mentioned problems and can be applied to the cap and the container body of the container filled with the contents for a sealing mark, and if it is peeled off after being attached, the fact that it has been peeled off is easy It is an object of the present invention to provide a pressure-sensitive adhesive label that can be detected in the past and can prevent the fact that it has been peeled off.
[0005]
[Means for Solving the Problems]
The present inventor has conducted extensive studies to solve the above problems, a certain brittle resin layer provided between the adhesive layer and the specific film substrate, and the stiffness of the film substrate in a specific range, also In addition, by giving peelability to the interface between the film substrate and the brittle resin layer, when the adhesive label is peeled off after being attached to the adherend, the entire adhesive label is not peeled off, but only the film substrate is peeled off. The present inventors have found that the above-mentioned problems can be solved by giving the brittle resin layer the property that it does not adhere even if the peeled film base material is reapplied to the brittle resin layer, and the present invention has been completed.
That is, in the present invention, a film substrate, a brittle resin layer, and an adhesive layer are sequentially laminated, the film substrate is a polyolefin film, and the stiffness measured according to TAPPI T543pm-84 of the film substrate. The brittle resin layer has an acrylic resin and an ethylene-vinyl acetate copolymer in a solid content ratio of 5 to 60 parts by mass of the ethylene-vinyl acetate copolymer with respect to 100 parts by mass of the acrylic resin. A pressure-sensitive adhesive label comprising a mixture containing a proportion, wherein the brittle resin layer has peelability to the film substrate and does not have re-adhesion to the film substrate after peeling. Is to provide .
Moreover, this invention provides the adhesive label whose film base material is a polypropylene film in the said adhesive label.
In the pressure-sensitive adhesive label according to the present invention, the peel strength between the film substrate and the brittle resin layer is 350 to 950 mN / 25 mm, and the stiffness measured according to TAPPI T543pm-84 of the film substrate is 15 to 60 mg. The pressure sensitive adhesive label which is the range of this is provided.
Moreover, this invention provides the adhesive label whose film base material is a polypropylene film in the said adhesive label.
Moreover, this invention provides the adhesive label whose thickness of a brittle resin layer is the range of 1-50 micrometers in the said adhesive label.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to FIG.
In the figure, 1 is an adhesive label of the present invention, 2 is a film substrate, 3 is a brittle resin layer, and 4 is an adhesive layer.
The adhesive label 1 of the present invention, the film substrate 2, polyethylene, polypropylene, ethylene - although polyolefin or Ranaru films such as vinyl acetate copolymer may be used, in particular, polyethylene, a film made of polyolefin such as polypropylene Preferably used. The film substrate 2 may be uniaxially stretched or biaxially stretched, but is preferably biaxially stretched. The film substrate 2 may be a single layer or a multilayer of two or more layers of the same type or different types. The film base 2 is preferably water resistant. If it is water resistant, it will not break even if it gets wet.
[0007]
Stiffness measured in accordance with TAPPI T543pm-84 is a resistance ability against applied bending stress, and specifically represents the flexibility of the film substrate 2 and the so-called waist strength in the present invention.
The film substrate 2 has a stiffness measured according to TAPPI T543pm-84 in the range of 10 to 100 mg, and particularly preferably in the range of 15 to 60 mg. When the stiffness is less than 10 mg, the film substrate 2 is too soft, and is inferior in handleability and labeling suitability. If the stiffness exceeds 100 mg, the film substrate 2 becomes hard and cannot follow a three-dimensional curved surface, and it becomes difficult to adhere to the uneven surface of the adherend. By setting the stiffness within this range, the pressure-sensitive adhesive label 1 can be bonded to a three-dimensional curved surface, and the bonded state can be maintained for a long time, and the pressure-sensitive adhesive label 1 can be firmly bonded to the uneven surface of the adherend. It can also have suitable labeling properties.
The thickness of the film substrate 2 is not particularly limited, but is usually 10 to 200 μm, preferably 20 to 100 μm.
The film substrate 2 may be transparent or opaque.
A display layer for characters, symbols, lines, figures, pictures, and the like can be provided on the front or back surface of the film substrate 2 by printing or the like.
[0008]
In the present invention, a brittle resin layer 3 is provided on the back surface of the film substrate 2.
The brittle resin layer 3 has peelability from the film substrate 2. Because of this property, when the adhesive label 1 is peeled off after being applied to an adherend, the entire adhesive label 1 does not peel, but only the film substrate 2 peels, and the brittle resin layer 3 and the adhesive layer 4 It remains affixed to the adherend. Furthermore, the brittle resin layer 3 does not have re-adhesiveness with the film substrate 2 after peeling. Because of this property, the film substrate 2 peeled off from the adherend is not bonded even if it is reapplied to the brittle resin layer 3 that is still attached to the adherend. Thereby, it is possible to easily recognize the fact that the adhesive label 1 has been peeled off from the adherend. Furthermore, since the brittle resin layer 3 has brittleness, after the adhesive label 1 is pasted on the adherend, the film base 2 is completely peeled off, and then the remaining brittle resin layer. 3 can be peeled off from the adherend only together with the pressure-sensitive adhesive layer 4, thereby easily recognizing the fact that the pressure-sensitive adhesive label 1 has been peeled off from the adherend. can do.
[0009]
The brittle resin layer 3 is composed of a mixture of an acrylic resin and an ethylene-vinyl acetate copolymer resin. The mixing ratio of the mixture of the acrylic resin and the ethylene-vinyl acetate copolymer resin is preferably 5 to 60 parts by mass and particularly preferably 20 to 50 parts by mass with respect to 100 parts by mass of the acrylic resin as a solid content ratio.
If necessary, the resin may contain a filler such as titanium oxide or silica to improve brittleness.
The brittle resin layer 3 is preferably transparent.
1-50 micrometers is preferable and, as for the thickness of the brittle resin layer 3, 5-30 micrometers is especially preferable.
The brittle resin layer 3 can be provided on the surface of the film base 2 by a method of applying the resin diluted with a solvent or the like and drying, a method of heat extrusion laminating, or the like.
[0010]
In the present invention, the adhesive layer 4 is provided on the back surface of the brittle resin layer 3.
The peel strength of the film substrate 2 with respect to the brittle resin layer 3 is set smaller than the peel strength of the adhesive layer 4 with respect to the adherend and the peel strength of the adhesive layer 4 with respect to the brittle resin layer 3. The peel strength of the film substrate 2 with respect to the brittle resin layer 3 is preferably 150 to 1400 mN / 25 mm, particularly preferably 350 to 950 mN / 25 mm. The peel strength here is measured according to JIS Z0237. In order to adjust the peel strength of the film substrate 2 with respect to the brittle resin layer 3, the surface of the film substrate 2 may be surface-treated. Examples of the surface treatment method include corona discharge treatment and chemical treatment.
[0011]
The pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 4 is, for example, a natural rubber-based pressure-sensitive adhesive, a synthetic rubber-based pressure-sensitive adhesive, an acrylic resin-based pressure-sensitive adhesive, a polyvinyl ether resin-based pressure-sensitive adhesive, a urethane resin-based pressure-sensitive adhesive, or a silicone resin-based pressure-sensitive adhesive. Etc. Specific examples of the synthetic rubber pressure-sensitive adhesive include styrene-butadiene rubber, polyisobutylene rubber, isobutylene-isoprene rubber, isoprene rubber, styrene-isoprene block copolymer, styrene-butadiene block copolymer, styrene-ethylene-butylene block. Examples thereof include copolymers and ethylene-vinyl acetate thermoplastic elastomers. Specific examples of the acrylic resin-based adhesive include acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, acrylonitrile Homopolymers or copolymers such as Specific examples of the polyvinyl ether resin pressure-sensitive adhesive include polyvinyl ether and polyvinyl isobutyl ether. Specific examples of the silicone resin-based pressure-sensitive adhesive include dimethylpolysiloxane. These pressure-sensitive adhesives can be used alone or in combination of two or more.
[0012]
The pressure-sensitive adhesive layer 4 may contain a tackifier, a softener, an anti-aging agent, a filler, a colorant such as a dye or a pigment, and the like as necessary. Examples of the tackifier include rosin resin, terpene phenol resin, terpene resin, aromatic hydrocarbon-modified terpene resin, petroleum resin, coumarone / indene resin, styrene resin, phenol resin, xylene resin and the like. Examples of the softener include process oil, liquid rubber, and plasticizer. Examples of the filler include silica, talc, clay, calcium carbonate and the like.
The thickness of the pressure-sensitive adhesive layer 4 is not particularly limited, but is usually 10 to 100 μm, and preferably 15 to 50 μm.
[0013]
The surface of the pressure-sensitive adhesive layer 4 may be covered with a release sheet 5. Further, without using the release sheet 5, release properties may be imparted by applying a release agent to the surface of the film substrate 2, and the pressure-sensitive adhesive label 1 may be rolled and stored. In this way, the surface of the pressure-sensitive adhesive layer 4 can be protected.
Any release sheet 5 may be used. For example, films made of various resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, polyarylate, polyethylene laminated paper, polypropylene laminated paper, clay coat Various paper materials such as paper, resin-coated paper, glassine paper and the like are used as a base material, and a joint surface of the base material with the pressure-sensitive adhesive layer 4 may be subjected to a peeling treatment if necessary.
In this case, a typical example of the release treatment includes formation of a release agent layer made of a release agent such as a silicone resin, a long-chain alkyl resin, or a fluorine resin.
The thickness of the release sheet 5 is not particularly limited and may be appropriately selected.
The pressure-sensitive adhesive layer 4 may be directly applied and formed on the brittle resin layer 3 provided on one side of the film substrate 2, and the pressure-sensitive adhesive is applied to the release agent layer surface of the release sheet 5 and dried. After forming the layer 4, it may be bonded to the film substrate 2 provided with the brittle resin layer 3. Various methods can be used as the method for forming the pressure-sensitive adhesive layer 4 without any particular limitation. For example, an air knife coater, a blade coater, a bar coater, a gravure coater, a roll coater, a curtain coater, a die coater, a knife coater, a screen. Examples include coaters, Mayer bar coaters, kiss coaters.
[0014]
In the pressure-sensitive adhesive label of the present invention, a display layer a such as characters, figures and patterns may be provided on the back surface of the brittle resin layer 3 (the surface on which the pressure-sensitive adhesive layer 4 is provided) by means such as printing and printing. preferable. When the display layer a is applied to the back surface of the brittle resin layer 3, the brittle resin layer is formed from the film base 2 side of the pressure-sensitive adhesive label 1 when the print receiving layer or the film base 2 is opaque. 3 is not visible, but when the film substrate 2 is peeled off, the display layer a such as characters and patterns formed on the brittle resin layer 3 can be visually observed. The fact that 2 is peeled can be grasped very easily.
[0015]
Further, although not shown, a print receiving layer may be provided on the surface of the film substrate 2. By providing a print receiving layer on the surface of the film substrate 2, display layers such as characters, symbols, lines, figures and pictures can be easily attached by printing or the like.
The print receiving layer may be transparent or opaque.
The thickness of the print receiving layer is not particularly limited, but is usually 0.1 to 30 μm, preferably 1 to 10 μm.
The print receiving layer can be formed by a method such as applying and printing a mixed resin solution of a filler such as talc, clay and silica and an organic binder such as an acrylic resin and a polyester resin.
[0016]
When the pressure-sensitive adhesive label 1 of the present invention is applied to an adherend and then peeled off, the film substrate 2 is peeled off from the interface with the brittle resin layer 3, and the brittle resin layer 3 is adhered together with the pressure-sensitive adhesive layer 4. Remain in the body. When the film base 2 is made opaque and a display layer a such as a character or pattern is provided on the back surface of the brittle resin layer 3, printing of the brittle resin layer 3 is recognized when the film base 2 is peeled off. And the fact that it has been peeled off can be easily identified. Since the brittle resin layer 3 is not sticky and its surface is not sticky, it cannot be pasted even if the film substrate 2 is to be pasted again. On the other hand, since the brittle resin layer 3 is brittle, it is difficult to peel it from the adherend without breaking, and therefore, the brittle resin layer 3 is difficult to tamper with.
[0017]
【Example】
Next, the present invention will be specifically described with reference to examples. However, the present invention is not limited by these examples.
<Measurement method of stiffness>
The stiffness of the film substrate measured according to TAPPI T543pm-84 was measured with a stiffness measuring device (manufactured by TAPPI Information Resources Administrator). The stiffness of the film substrate is an average value in the flow direction and the width direction of the film substrate.
[0018]
Example 1
Corona discharge treatment on the back side of white biaxially stretched polypropylene film (Nisshinbo Co., Ltd., trade name “Peach Coat SPB-70”) having a length of 20 m, a width of 10 cm, a thickness of 70 μm, and a stiffness of 25 mg as a film base. Then, a coating solution containing a mixture of 30 parts by mass (solid content) of ethylene-vinyl acetate resin is applied to 100 parts by mass (solid content) of polymethyl methacrylate as an acrylic resin, dried, and transparent brittle A resin layer (thickness: 10 μm) was provided to produce a film substrate with a brittle resin layer. Further, a display layer was formed on the surface of the brittle resin layer by printing. On the other hand, an acrylic pressure-sensitive adhesive (manufactured by Lintec Co., Ltd., trade name “PA-”) on the release layer surface of a release sheet (Lintech Co., Ltd., trade name “SP-8KA”) having a length of 20 m, a width of 10 cm, and a thickness of 80 μm. T1 ") was applied with a knife coater and dried to provide a pressure-sensitive adhesive layer (thickness: 20 μm) to prepare a release sheet with a pressure-sensitive adhesive layer. Next, the brittle resin layer of the film base material with the brittle resin layer was laminated and bonded onto the adhesive layer of the release sheet with the adhesive layer to produce an adhesive label. Then, it was formed into an adhesive label sheet in which rectangular adhesive labels of 8 cm × 3 cm were continuously arranged on the release sheet by a die cutting device.
[0019]
A labeling machine (Lintech Co., Ltd., trade name “MD-1”) is used to seal the adhesive label between the cap body and the cap body on which the fine groove slip prevention structure of the polypropylene resin shampoo container is formed. When a labeling test was performed at a speed of 80 sheets / min, all of them could be adhered satisfactorily. Also, after 1 month of sticking, the adhesive label was peeled off, and the film substrate was peeled off from the interface of the brittle resin layer, and the brittle resin layer and the adhesive layer underneath were still stuck on the shampoo container body. . Moreover, the display layer printed on the brittle resin layer surface was recognized visually. The peel strength from the brittle resin layer of the film base was 400 mN / 25 mm. Moreover, even if the peeled film base material was stuck on the brittle resin layer again, it could not be stuck.
[0020]
【The invention's effect】
The pressure-sensitive adhesive label of the present invention can adhere well to an adherend having a three-dimensional curved surface or an uneven surface, and when it is peeled off after being attached to the adherend, the fact that it has been peeled off can be easily found and peeled off. Can prevent the destruction of the facts.
[Brief description of the drawings]
FIG. 1 shows a cross-sectional view of an example of an adhesive label of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Adhesive label 2 Film base material 3 Brittle resin layer 4 Adhesive layer 5 Release sheet a Display layer

Claims (5)

A film base material, a brittle resin layer and an adhesive layer are sequentially laminated, the film base material is a polyolefin film, and the stiffness of the film base material measured according to TAPPI T543pm-84 is in the range of 10 to 100 mg. And the brittle resin layer contains an acrylic resin and an ethylene-vinyl acetate copolymer in a ratio of 5 to 60 parts by mass of the ethylene-vinyl acetate copolymer with respect to 100 parts by mass of the acrylic resin in a solid content ratio. A pressure-sensitive adhesive label comprising : the brittle resin layer having releasability from a film substrate and not having re-adhesion to the film substrate after peeling. The pressure-sensitive adhesive label according to claim 1 , wherein the film substrate is a polypropylene film. Peel strength of the film substrate and the brittle resin layer is 350~950mN / 25mm, according to claim 1 or 2 stiffness was measured according to TAPPI T543pm-84 of the film substrate is in a range of 15~60mg Sticky label. The pressure-sensitive adhesive label according to claim 3 , wherein the film substrate is a polypropylene film. Adhesive label according to any one of claims 1-4 thickness of brittle resin layer is in the range of 1 to 50 [mu] m.

Images