JP3175948B2 - Reusable label and adhesive composition for reusable label - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label and an adhesive composition, and more particularly to a label for preventing reuse and an adhesive composition used therefor.

[0002]

2. Description of the Related Art Some labels for price tags and certificates are difficult to reuse once used to prevent unauthorized use. For example, Japanese Patent Application Laid-Open No. 62-3281 discloses a release layer 2, a residual layer 3 laminated on the release layer 2, and an intermediate layer for bonding the release layer 2 and the residual layer 3, as shown in FIG. A reuse prevention label 1 with a layer 4 is shown.

In this label 1, the release layer 2 is composed of a printing layer 5
And a resin film layer 6 having the following. The residual layer 3 is composed of a laminate of a coating layer 7, an adhesive layer 8, and a release paper 9. The intermediate layer 4 includes the first release layer 10 and the temporary adhesion layer 1.
1, an easily peelable layer 12, and a second peelable layer 13. The first peelable layer 10 is laminated on the peelable layer 2, and the residual layer 3 is laminated on the second peelable layer 3. I have. Second
The release layer 13 is not laminated on the entire surface of the easy release layer 12, but is laminated in a predetermined pattern. The first release layer 10 and the second release layer 13 are made of, for example, silicon resin, fluororesin, paraffin, wax, or the like. The temporary adhesion layer 11 is made of a two-component reactive polymer resin such as urethane resin, ethylene-vinyl acetate copolymer resin, polyvinyl alcohol, polyvinyl chloride acetate resin, and acrylic resin;
It is composed of a thermosetting adhesive such as polyester or polyurethane. As the easily peelable layer 12, for example, a brittle film formed by mixing an extender pigment such as titanium white or calcium carbonate with an aluminum foil or a copolymer resin composed of vinyl chloride and acrylic is used.

[0004] When the release paper 9 is peeled off, the adhesive layer 8 of the reuse prevention label 1 is exposed, and the label 1 is adhered to a predetermined portion by the adhesive layer 8. When the reusable label 1 is to be peeled, it is peeled off at the interface between the first release layer 10 and the temporary adhesion layer 11 and at the interface between the second release layer 13 and the coating layer 7. Here, since the coating layer 7 and the second release layer 13 are only partially in contact with each other, the coating layer 7 has a part to be separated and a part not to be separated, and uneven separation occurs. This allows
The reuse prevention label 1 cannot be reused.

[0005]

In the conventional label 1 for preventing reuse, since the intermediate layer 4 is composed of four layers, the production is troublesome and the cost is high.

It is an object of the present invention to provide a reusable label which is easy and inexpensive to manufacture, and an adhesive composition for realizing the label.

[0007]

According to the present invention, there is provided a label for preventing reuse which has a release layer, an adhesive layer and a residual layer laminated on the release layer, and an adhesive for bonding the release layer and the residual layer. And layers. The adhesive layer is composed of an adhesive composition containing 100 parts by weight of an acrylic polyol-based polymer, 25 to 250 parts by weight of nitrified cotton, and 7 to 50 parts by weight of polyethylene wax.

[0008] The adhesive composition of the present invention is an adhesive composition for bonding a release layer and a residual layer in a reuse prevention label having a release layer and a residual layer. This adhesive composition contains 100 parts by weight of an acrylic polyol-based polymer, 25 to 250 parts by weight of nitrified cotton, and 7 to 50 parts by weight of polyethylene wax. ********

FIG. 1 is a schematic structural view of a reuse prevention label according to the present invention. Referring to FIG.
Is composed of a release layer 16 and a residual layer 17 having an adhesive layer 18 laminated thereon. The release layer 16 and the residual layer 17 are bonded by an adhesive layer 19 made of the adhesive composition according to the present invention.

The release layer 16 is a resin film layer, a paper layer, a synthetic paper layer, a metal thin film layer or the like, and a printed layer having a predetermined pattern is disposed on the surface as required. The residual layer 17
Examples include a resin coating layer, a resin film layer, an ink receiving layer having a printing layer, a paper layer, and a synthetic paper layer. Adhesive layer 1 of residual layer 17
8 is, for example, acrylic, urethane, silicon,
It is configured using a general adhesive such as a styrene-butadiene-based or vinyl acetate-based adhesive.

The adhesive composition constituting the adhesive layer 19 contains an acrylic polyol-based polymer, nitrified cotton, and polyethylene wax. The acrylic polyol-based polymer is an acrylic copolymer having a hydroxyl group. Examples of the copolymerization component include acrylic acid and its alkyl ester, methacrylic acid and its alkyl ester, maleic anhydride, styrene, vinyl acetate, and acrylamide. Examples of the copolymer component having a hydroxyl group include 2-hydroxyethyl methacrylate, bidroxypropyl methacrylate, and 2-vidroxyethyl acrylate.

Nitrified cotton is obtained by reacting cellulose with nitric acid. Among them, in the present invention, the degree of polymerization is 40 to
A 450 degree cellulose has a nitrification degree of 10.7-12.5.
(More preferably, 11.5 to 12.2) is preferably used. If the degree of polymerization is less than 40, the dried coating film may stick,
If it exceeds, it is easy to gel. The nitrification degree is 10.7
If it is less than 10 , the solubility in the solvent becomes poor, and conversely, 12.
If it exceeds 5, there is a risk of explosion.

The polyethylene wax used in the present invention is a high-density polyethylene obtained by polymerizing ethylene alone, a low-density polyethylene obtained by copolymerizing ethylene with another α-olefin, and a wax comprising a mixture thereof. In particular, those having a molecular weight of 800 to 3000 (more preferably 900 to 2000) and a particle size of 1 to 10 μm (more preferably 2 to 4 μm) are preferable.

In the above-mentioned adhesive composition, 25 to 100 parts by weight of the acrylic polyol-based polymer is used.
250 parts by weight and 7 to 50 parts by weight of polyethylene wax are mixed respectively. When the amount of the nitrified cotton is less than 25 parts by weight and the amount of the polyethylene wax exceeds 50 parts by weight, the object of the present invention cannot be achieved because the adhesive strength of the adhesive layer 19 is too small. Conversely, nitrified cotton is 25
When the amount exceeds 0 parts by weight and the amount of polyethylene wax is less than 7 parts by weight, the adhesive force of the adhesive layer 19 exceeds the adhesive force of the adhesive layer 18, so that the object of the present invention is hardly achieved.

The adhesive composition of the present invention may contain additives such as a stabilizer, an antistatic agent, a flame retardant, a filler, a coloring agent and a lubricant in addition to the above-mentioned essential components. good.

Next, an example of a method for manufacturing the reuse prevention label 15 will be described. First, a release layer 16 is prepared, and an adhesive layer 19 is disposed thereon. The adhesive layer 19 can be arranged by diluting the above-mentioned adhesive composition with a solvent such as methyl ethyl ketone, toluene or ethyl acetate and applying the diluted adhesive composition on the release layer 16. Examples of the application method include a kissmeyer bar method, and other known application methods such as a gravure coater, a reverse roll, and a die coat may be employed. Next, the residual layer 17 is disposed on the adhesive layer 19. Remaining layer 17
Is arranged by being applied or laminated on the adhesive layer 19. The adhesive layer 18 is arranged by being applied on the residual layer 17. The adhesive layer 18 may be disposed after the residual layer 17 is laminated on the adhesive layer 19, or may be disposed on the residual layer 17 in advance.

The reuse prevention label 15 is used by being attached to a member such as glass or steel plate. here,
The reuse prevention label 15 is attached to a member such as glass by the adhesive layer 18. The reuse prevention label 15 once applied to the member is difficult to reuse because even if an attempt is made to peel it off in order to reapply it to another part, it will be peeled off at the interface between the release layer 16 and the residual layer 17. It is. Moreover,
In the label 15 of the present invention, since the adhesive layer 19 is made of the adhesive composition as described above, a part of the residual layer 17 is peeled off together with the release layer 16, so that the label 15 is peeled off after being once adhered. You can see at a glance what was done.

Next, the specific use of the reuse prevention label of the present invention will be described.

Certification Label The reuse prevention label of the present invention can be used as a certification label such as a quality assurance label. FIG. 2 shows an example of such a certification label. In the figure, the certification label 20 is
Release layer 21, residual layer 23, release layer 21 and residual layer 23
And an adhesive layer 22 for adhering them. The release layer 21 is a base film 2 having a printing layer 24.
5. The base film 25 is made of a resin film such as polyethylene, polyethylene terephthalate, polypropylene, polyvinyl chloride, and polycarbonate, and has a thickness of 10 to 250 μm, but is not particularly limited. The printing layer 24 is
For example, it is arranged on one surface of the base film 15 in a predetermined character pattern, and displays a notice or the like.

The adhesive layer 22 is disposed by applying the above-mentioned adhesive composition on the base film 25.
The thickness of the adhesive layer 22 is usually set to 1.5 to 2.5 μm, but is not particularly limited.

The residual layer 23 includes an ink receiving layer 26 disposed on the adhesive layer 22 and a printing layer 27 disposed thereon.
And an adhesive layer 28 disposed thereon. The ink receiving layer 26 may be made of, for example, an acrylic, polyester, urethane, or vinyl acetate adhesive, or inorganic or organic particles, an antistatic agent, an antiblocking agent, a lubricant, or an ultraviolet absorber. And the like. The type of adhesive is
It is appropriately selected according to the type of ink used in the printing layer 27. The thickness of the ink receiving layer 26 is usually set to about 2 to 5 μm, but is not particularly limited. Printing layer 2
Numerals 7 are arranged in a predetermined character pattern on the ink receiving layer 26 using a known printing technique such as offset printing or silk screen printing. As a result, the certification label 20 displays certification contents such as quality assurance and inspection contents. The adhesive layer 28 is made of an acrylic or urethane-based adhesive like the above-mentioned adhesive layer 18 and has a thickness of about 20 to 30 μm, but is not particularly limited.

In the above-described certification label 20, a release paper 29 is laminated on the adhesive layer 28. The release paper 29 is a paper sheet coated with a release agent such as a silicon-based, polyolefin-based, or paraffin-based release agent.

The certification label 20 is used, for example, as a label for quality assurance of a product using glass. Here, the certification label 20 is attached to the inside of the glass by the adhesive layer 28 after the release paper 29 is removed. In the attached certification label 20, the printing layer 27 is applied from outside the glass.
You can see the contents of the certification by.

When the certification label 20 attached to the inside of the glass is to be peeled off from the glass, it is peeled off at the interface between the adhesive layer 22 and the residual layer 23, and only the peeling layer 21 is peeled off. At this time, a part of the ink receiving layer 26 adheres to the adhesive layer 22 and is peeled off at the same time. Therefore, the certification label 20 used once is less likely to be illegally reused.

The label for sealing The reuse prevention label of the present invention is applied to, for example, a label for sealing a film for packaging a confectionery package. FIG. 3 shows an example of this type of label 30 for sealing. In the figure, a label for sealing 30 is composed of a release layer 31.
, A residual layer 33, and an adhesive layer 32 for bonding the release layer 31 and the residual layer 33. The release layer 31 includes a surface layer 34 having a print layer 34a. The surface layer 34 is made of a resin film, paper, synthetic paper, or the like that is unlikely to be thermally shrunk like polyester or nylon, and has a thickness of about 10 to 250 μm.
There is no particular limitation. The printing layer 34a is arranged on the surface layer 34 in, for example, a predetermined character pattern.

The adhesive layer 32 is made of the above-mentioned adhesive composition and has a thickness of 1.5 to 2.5 μm, but is not particularly limited.

The residual layer 33 is composed of a covering layer 35 and an adhesive layer 36. The coating layer 35 is a layer that covers the adhesive layer 36 in order to prevent the adhesive layer 36 from being exposed to the surface and sticky when the release layer 31 is peeled off as described later. The coating layer 35 is formed by coating the surface of the adhesive layer 32 with a resin such as urethane resin, ethylene-vinyl acetate resin, polyvinyl alcohol, vinyl chloride resin, nitrocellulose resin, polyamide resin, and acrylic resin. ing. The thickness of the coating layer 35 is set to 5 to 10 μm, but is not particularly limited. The pressure-sensitive adhesive layer 36 is formed of the same pressure-sensitive adhesive as the pressure-sensitive adhesive layer 18 described above, and usually has a thickness of 20 to 30 μm.
m, but is not particularly limited.

In the label 30 for sealing, the adhesive layer 36
Is laminated with a release paper 37. As the release paper 37,
The same release paper as that used for the certification label 20 can be used.

The seal label 30 is used, for example, as a seal for fixing a folded portion of a packaging film of a candy package. Label for seal 30
The release paper 37 is peeled off, and is adhered to the packaging film by the adhesive layer 36.

When the seal label 30 attached to the packaging film is to be peeled off, it peels off at the interface between the adhesive layer 32 and the residual layer 33. At this time, the adhesive layer 32
Part of the coating layer 35 adheres and is peeled off. This allows
The seal label 30 cannot be reused. Also,
Once the peeling layer 31 is peeled off from the label 30 for sealing,
It is difficult to again stack the release layer 31 on the residual layer 33 and restore the original state. For this reason, if the seal label 30 is used, it can be easily recognized that the package has been opened, so that it is possible to effectively prevent the candy in the package from being mixed with toxic substances.

[0031]

EXAMPLES Example 1 Hitaloid 3204-45 as an acrylic polyol
100 parts by weight (trade name, manufactured by Hitachi Chemical Co., Ltd.) and HIG 1/16 as nitrified cotton (trade name, Asahi Chemical Industry Co., Ltd.)
125 parts by weight, high wax 120P as polyethylene wax (trade name, manufactured by Mitsui Petrochemical Co., Ltd.) 25
The mixture was diluted with a mixed solvent of methyl ethyl ketone: toluene: ethyl acetate (5: 2: 1) so as to have a solid concentration of 18% by weight to prepare an adhesive composition.

This adhesive composition is coated with a 50 μm-thick
Lumirror 50E70 (trade name, manufactured by Toray Industries, Inc.) was applied using a gravure coater to a dry film thickness of 2 μm to form an adhesive layer.

Next, an ink receiving layer, a printing layer and an adhesive layer were laminated on the adhesive layer in this order. The ink receiving layer was made of Lamister 65 white (trade name, Toyo Ink Mfg. Co., Ltd.), the solid content of which was adjusted to 20% by weight with methyl ethyl ketone.
Was coated on the adhesive layer using a metaling bar so that the dry coating film had a thickness of 2 μm. The printing layer is BEST CURE UV161 on the ink receiving layer.
Black ink (trade name, manufactured by Toka Dyeing Chemical Industry Co., Ltd.) was arranged by printing using an RI tester. The pressure-sensitive adhesive layer was formed by applying an acrylic pressure-sensitive adhesive manufactured by Nippon Carbide Industry Co., Ltd. using a blade coater so that the dry coating film had a thickness of 25 μm. A release paper was laminated on the adhesive layer of the obtained laminate to obtain a certification label.

Example 2 100 parts by weight of Hitaloid 3124L (trade name, manufactured by Hitachi Chemical Co., Ltd.) as an acrylic polyol, 160 parts by weight of HIG1 / 16 as nitrified cotton, and 200 W of high wax as a polyethylene wax (trade name, 29 parts by weight of Mitsui Petrochemical Co., Ltd.) were mixed, and this was diluted with a mixed solvent of methyl ethyl ketone: toluene: ethyl acetate (5: 2: 1) so that the solid content concentration became 15% by weight. I adjusted things.

The resulting adhesive composition is lumira coated with a gravure coater so that the dry film thickness becomes 1.7 μm.
-50E70 to prepare a resin film having an adhesive layer. Then, a certification label was prepared from this resin film in the same manner as in Example 1.

Example 3 100 parts by weight of acrylic polyol manufactured by Hitachi Chemical Co., Ltd., 39 parts by weight of HIG1 / 16 as nitrified cotton, and 15 parts by weight of polyethylene wax manufactured by Mitsui Petrochemical Co., Ltd. were mixed. This was adjusted to a solid concentration of 20% by weight with methyl ethyl ketone: toluene: ethyl acetate (5: 2:
The mixture was diluted according to 1) to prepare an adhesive composition. It should be noted that the acrylic polyol contains 4
A mixture of 6% by weight and 54% by weight of Hitaloid 3124L was used. The polyethylene wax contains 50% by weight of high wax 120P and 200% of high wax 200P.
A mixture with 50% by weight of P was used.

The obtained adhesive composition was lumira coated with a gravure coater so that the dry film thickness became 2.3 μm.
-50E70 to prepare a resin film having an adhesive layer. Then, a certification label was prepared from the obtained resin film in the same manner as in Example 1.

COMPARATIVE EXAMPLE 1 Polyester adhesive Byron 200 (trade name, manufactured by Toyobo Co., Ltd.) was diluted with methyl ethyl ketone so as to have a solid concentration of 20% by weight. Created a certification label.

Comparative Example 2 A urethane adhesive Barnock (trade name, manufactured by Dainippon Ink Co., Ltd.) was treated with methyl ethyl ketone at a solid concentration of 2
Using the adhesive diluted to 0% by weight as an adhesive,
A certification label was created in the same manner as in Example 1.

With respect to the certification labels obtained in Test Examples 1 to 3 and Comparative Examples 1 and 2, respectively, a peeling test was performed as follows using a glass plate having a thickness of 2 mm.

Using a manual 2 kg rubber roller,
A known adhesive was placed on a glass plate by three reciprocating pressure bondings. At this time, the adhesive is 35 mm or more in width and 1 in length.
It was arranged at the center of the glass plate so as to be about 00 mm. Then, on the placed adhesive, width 25 mm, length 150 m
The test piece of the certification label cut to m was placed, and the test piece was pressed back and forth three times using a manual 5 kg rubber roller. At this time, about 50 mm of the test piece was left without being pressed, so that the peel test could be easily performed.

With respect to the test pieces set as described above, the adhesive strength, the residual ratio after peeling, and the possibility of reuse were examined. Adhesive strength, the adhesive layer is 20 to 40 minutes after the crimping, the test piece is folded back at 180 ° and peeled off by about 10 mm, and further peeled off continuously at a speed of 300 mm / min using a tensile tester. The adhesive strength was measured. Also,
Residual rate, 1mm square grid is placed on a transparent glass drawn in a range of 10mm × 50mm test piece substrate after peeling,
The area of the remaining adhesive was measured with a magnifying glass. Furthermore, the reusability was visually determined based on the state of destruction of the printed layer after peeling.

Table 1 shows the results.

[0044]

[Table 1]

[0045]

The reuse prevention label of the present invention has the above-mentioned adhesive layer and can be easily and inexpensively manufactured.

Further, according to the adhesive composition of the present invention, a reusable label can be easily produced at low cost.

[0047]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a reuse prevention label of the present invention.

FIG. 2 is a longitudinal sectional view of a certification label to which the present invention is applied.

FIG. 3 is a longitudinal sectional view of a label for a seal employing the present invention.

FIG. 4 is a longitudinal sectional view of a conventional example.

[Explanation of symbols]

 16, 21, 31 Release layer 17, 23, 33 Residual layer 18, 28, 36 Adhesive layer 19, 22, 32 Adhesive layer

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Hashimoto 2773-2 Takenoshita, Koyama-cho, Sunto-gun, Shizuoka Prefecture Inside PANAC CORPORATION (56) References JP-A-62-135879 (JP, A) JP-A-63- 230783 (JP, A) JP-A-61-97684 (JP, A) JP-A 62-9571 (JP, U) JP-A 50-9322 (JP, Y1) (58) Fields investigated (Int. ⁷ , DB name) G09F 3/03

Claims (2)

(57) [Claims] An adhesive layer for bonding the release layer and the residual layer, the adhesive layer including an adhesive layer, and a residual layer having an adhesive layer, the residual layer being laminated on the release layer; 100 parts by weight of a polyol-based polymer and nitrified cotton 25 to 25
A reuse prevention label comprising an adhesive composition containing 0 parts by weight and 7 to 50 parts by weight of a polyethylene wax. 2. An adhesive composition for bonding a release layer and a residual layer in a reuse prevention label having a release layer and a residual layer, wherein the acrylic polyol polymer 1
An adhesive composition for a label for preventing reuse, comprising 00 parts by weight, 25 to 250 parts by weight of nitrified cotton, and 7 to 50 parts by weight of polyethylene wax.