JP3107495B2 - Adhesive 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 pressure-sensitive adhesive label, and more particularly, to a method suitable for real-time printing of characters, symbols, etc. on the surface of a pressure-sensitive adhesive layer formed on a label substrate without requiring a plate making process. Related to adhesive labels.

[0002]

2. Description of the Related Art It has been known that a recording paper or a film coated with an ink receiving layer is used as a surface base material of a label, and the ink receiving layer is used as a printing surface to print characters, symbols, and the like. . Various attempts have been made to improve the ink receptivity of the ink receiving layer or the ink drying property after printing in order to maintain a constant printing state applied to the ink receiving layer.

[0003] According to this, by applying an adhesive label to various adherends, it is possible to obtain a certain display effect with characters, symbols, and the like represented on the surface base material of the adhesive label.

[0004]

However, the conventional pressure-sensitive adhesive label has a disadvantage that it cannot always exhibit sufficient characteristics in terms of water resistance and ink drying property of the ink receiving layer. In addition, the printed or image portion is always exposed on the surface, and the water resistance of the printed portion itself due to this is not sufficient, and as a result,
There is an inconvenience that bleeding, peeling, and the like of characters and symbols easily occur.

Further, in the conventional adhesive label, as described above, the ink receiving layer is inevitably provided as a surface base material of the adhesive label, and the layer structure of the adhesive label is correspondingly complicated. This also causes the cost of label products to rise. In this regard, printing on an adhesive layer of an existing adhesive label as an ink receiving layer has also been considered. When a solvent-based ink is used, printing on a base material or a normal pressure-sensitive adhesive surface is possible, but an ink jet printer used in a general office or the like is difficult to handle.
Since many of them use water-based inks, many existing pressure-sensitive labels cause disturbance in printing due to incompatibility between the composition of the pressure-sensitive adhesive layer and the liquid material for printing, and are still in practical use. Has not been reached.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised to improve the disadvantages of the prior art, and has as its object to provide an adhesive layer provided on an adhesive label and a printing liquid material to be printed thereon. In addition to realizing prints that can be distinguished by affinity with the ink, bleeding of the printed part, improvement of water resistance causing peeling, and further necessity of the existing ink receiving layer surface substrate An object of the present invention is to provide an adhesive label that can be expected to have a simplified structure.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention provides a label base material and a hydrophilic property provided on one surface of the label base material and serving as an adhesive surface to an adherend. And a print layer printed with a water-based ink on the surface of the adhesive layer. Here, as the label base material, a material formed of a transparent material can be adopted. In this case, the printing of the printing layer is adopted as a reverse image.

The pressure-sensitive adhesive label according to the present invention comprises a label substrate, a first pressure-sensitive adhesive layer provided on one surface of the label substrate, and a surface of the first pressure-sensitive adhesive layer. A printed layer of characters and symbols printed with an aqueous ink, a transparent protective film covered by the printed layer, and a second layer provided on the other surface of the label substrate to form an adhesive surface to an adherend. The second object is to achieve the above-mentioned object.

The pressure-sensitive adhesive layer is capable of imparting plasticity to a copolymer obtained by copolymerizing a hydrophilic pressure-sensitive adhesive, preferably another vinyl-type monomer copolymerizable with a carboxyl-containing vinyl-type monomer. A water-soluble or alkali-soluble adhesive layer obtained by adding a suitable surfactant is employed.

[0010]

According to the present invention, the material of the adhesive layer and the ink for printing provided on the adhesive layer are matched, so that the adhesive layer can sufficiently absorb the ink moisture, and the printing layer adapted to the adhesive layer. Can be formed. In addition, in a state where the adhesive label is attached to the adherend, a configuration in which the printing layer is sandwiched between the adhesive layer and the adherend can be adopted, and the printing surface is not physically located on the surface, and is water resistant. Is also solved.

In a structure in which a protective film is provided on the print layer and an adhesive layer acting as an adhesive surface to the adherend is provided on the other surface of the label substrate, the print layer is covered with the protective film. As a result, a certain printing state is secured.

[0012] The amount of the surfactant capable of imparting plasticity may be added to the base polymer 100 in terms of nonvolatile components.
For example, it is possible to use 50 to 500 parts by weight of the surfactant based on parts by weight.

The surfactant capable of imparting plasticity includes alkyl allyl ether type, for example, polyoxyethylene nonylphenyl ether, polyoxyethylene octyl phenyl ether, alkyl ether type polyoxyethylene lauryl ether, polyoxyethylene lauryl ether. Ethylene oleyl ether, alkyl ester type polyoxyethylene laurate, polyoxyethylene oleate,
Nonionic surfactants having an ethylene oxide group such as sorbitan oleate and alkyl ether phosphate salt, and having an ethylene oxide / propylene oxide block copolymer group such as Pluronic and Tetronic (both manufactured by Asahi Denka Co., Ltd.) Things. Further, anionic surfactants having an ethylene oxide group can also be used.

The adhesive layer on which the print layer is provided is provided with a release sheet before printing, but it is preferable to use a release agent which transfers little to the adhesive layer.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 to 3 show a first embodiment according to the present invention. Here, FIG. 1 shows an adhesive label material before a printing layer is formed. In FIG. 1, a front label 10 constituting a label substrate is constituted by a transparent film or sheet. The adhesive layer 11 and the release sheet 1 are provided on one surface of the front label
2 are sequentially provided in layers.

The pressure-sensitive adhesive layer 11 is made of a water-soluble or alkali-soluble pressure-sensitive adhesive having a hydrophilic property, for example, capable of achieving material matching with the aqueous ink of an ink-jet printer. Is also provided.

The surface label 10 integrated with the adhesive layer 11
A printing layer 13 including characters, symbols, and the like is provided by an inkjet printer (see FIG. 2). Here, the pressure-sensitive adhesive label 15 is constituted by the surface label 10, the pressure-sensitive adhesive layer 11, and the printing layer 13. The ink used in the ink jet printer is an aqueous ink, so that the printing on the adhesive layer 11 can be well adapted. In addition, print information such as characters constituting the print layer 13 is as follows.
It is input to the inkjet printer in advance,
Thus, the print content can be changed as appropriate.

The thus constructed adhesive label 15
As shown in FIG. 3, the printing layer 13 is pressed toward the adherend 16 and the adhesive layer 11 is adhered to the adherend 16 so that the entire adhesive label 15 is attached to the adherend 16. Will be done. At this time, the printing layer 13 has a configuration in which the printing layer 13 is viewed from the front label 10 side. Therefore, printing by the above-described inkjet printer is performed as a reverse image, and appears as a normal image when viewed from the front label 10 side. It has become.

FIG. 4 shows a second embodiment which is a modification of the above embodiment. This embodiment shows an adhesive label 15 that can be used when the adherend 16 is formed of a transparent material. Specifically, when the adhesive label 15 is attached to the transparent adherend 16, the display content of the print layer 13 can be visually recognized through the adherend 16. , Characters, symbols, etc., are printed with the initial printing form of the printer as a normal image. In this case, the substrate 1
0 may be opaque.

FIGS. 5 to 7 show a third embodiment of the present invention. In this embodiment, when the entire adhesive label 15 in each of the above embodiments is viewed as a single-layer type, it is configured to be distinguished as a multi-layer type. That is, in the raw fabric state, as shown in FIG. 5, the upper surface in the drawing, which is one surface of the core material 20 constituting the label base material, has the same composition as that shown in each of the above embodiments. First adhesive layer 21
And a first release sheet 22 attached to the adhesive layer 21
Are provided. On the other hand, on the other surface of the core material 20, a second adhesive layer 24 acting as an adhesive surface to the adherend is provided.
And a second release sheet 25 covering the adhesive layer 24 until the adhesive layer 24 is adhered to the adherend. The pressure-sensitive adhesive of the pressure-sensitive adhesive layer 24 does not necessarily need to be a hydrophilic pressure-sensitive adhesive than the pressure-sensitive adhesive of the first pressure-sensitive adhesive layer, and may be a pressure-sensitive adhesive having desired characteristics.

As shown in FIG. 6, the first release sheet 22 is released prior to printing on the first adhesive layer 21, and after this release, the same printing layer 26 as described above is used. Is formed, and as shown in FIG. 7, a transparent protective sheet 27 is attached to the surface side of the print layer 26. Here, the adhesive label 30 is constituted by the core material 20, the adhesive layers 21, 24 provided around the core material 20, the printing layer 26, and the protective film 27.

The adhesive label 30 thus formed
Peels off the second release sheet 25 from the second adhesive layer 24 and, as shown in FIG.
By pressing it toward.

As shown in FIG. 8, the protective sheet 27 attached to protect the printing layer 26 has a first
A configuration having a second adhesive layer 32 having the same composition as or a different composition from the adhesive layer 21 may be employed.

Next, the adhesive labels 15 and 30 according to the present invention will be described.
An experimental example will be described with reference to a comparative example in order to confirm the specific effects of the above.

Experimental Example 130 parts of water and 0.5 part of sodium bicarbonate were placed in a predetermined reaction vessel and stirred while purging with nitrogen. Acrylic acid 95
, A mixture of 5 parts of ethyl acrylate and 70 parts of water, and 20 parts of a potassium persulfate solution dissolved at a concentration of 0.5% in water as a polymerization initiator are prepared in separate containers. From the time when the internal temperature is heated to 88 ° C., the above-mentioned mixed solution of acrylic acid, ethyl acrylate and water and an aqueous solution of potassium persulfate are sequentially dropped from another port to start the polymerization reaction. Thereafter, the reaction is carried out dropwise for 3 hours while maintaining the reaction temperature at 90 ° C. After the dropwise addition, the polymerization reaction was continued for 2 hours at the same temperature to terminate the polymerization reaction, followed by cooling to obtain a slightly transparent base polymer. Next, 35 parts of polyoxyethylene octyl phenyl ether (a nonionic surfactant having an ethylene oxide addition number of 7, and HLB 12.2) was added to 100 parts of the base polymer, and the mixture was stirred at 50 ° C. for 2 hours to obtain an adhesive composition. Obtained.

The obtained pressure-sensitive adhesive was applied to a 50 μm polyester film so that the solid content was 30 g / m ^2. After drying, a release sheet was adhered to the pressure-sensitive adhesive surface. Then, the release sheet is peeled off, and an ink jet printer (B
J-200; manufactured by Canon Sales Co., Ltd.).

As a result, it was possible to print on the pressure-sensitive adhesive layers 11 and 21 with sufficient legibility, and no disturbance of the print after attaching the pressure-sensitive adhesive label was observed.

Comparative Example An acrylic solvent-based pressure-sensitive adhesive (trade name: Olivine BPS5002, manufactured by Toyo Ink Mfg. Co., Ltd.) and an acrylic emulsion-type pressure-sensitive adhesive (trade name: Olivine BPW5124, manufactured by the company) were used as the pressure-sensitive adhesive layer. Printing was attempted using the same printer as the experimental example.

However, under these conditions, it was not possible to print on the adhesive layer in such a way that it could be read.

[0031]

The present invention is constructed and operated as described above. According to this, the affinity between the adhesive layer provided on the adhesive label and the printing liquid material printed thereon is improved. In addition to realizing prints that can be distinguished by printing, we have also improved the water resistance, which causes bleeding and peeling of the printed parts, and have also simplified the structure by further increasing the need for the existing ink receiving layer surface substrate. It is possible to provide an adhesive label that can be expected and has an unprecedented excellent effect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an original label state of an adhesive label according to a first embodiment.

FIG. 2 is a sectional view showing a printing layer forming step in the embodiment.

FIG. 3 is a cross-sectional view showing a state in which the pressure-sensitive adhesive label is attached in the embodiment.

FIG. 4 is a sectional view showing a modified embodiment of FIG. 3 according to a second embodiment.

FIG. 5 is a cross-sectional view showing an original label state of an adhesive label according to a third embodiment.

FIG. 6 is a cross-sectional view illustrating a printing layer forming step in a third embodiment.

FIG. 7 is a cross-sectional view showing a state of sticking an adhesive label in a third embodiment.

FIG. 8 is a sectional view showing a modification of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Surface label as a label base material 11 Adhesive layer 13 Printing layer 15 Adhesive label 16 Adherend 20 Core material as a label base material 21 1st adhesive layer 24 2nd adhesive layer 26 Printing layer 27 Protective film 30 Adhesive label 31 adherend.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09F 3/00-3/20 C09J ^7/ 00-7/04

Claims (5)

(57) [Claims] 1. A label substrate, a hydrophilic adhesive layer provided on one surface of the label substrate and serving as an adhesive surface to an adherend, and a surface of the adhesive layer printed with an aqueous ink. An adhesive label, comprising: a printed layer. 2. The pressure-sensitive adhesive label according to claim 1, wherein the label substrate is formed of a transparent material, and the printing of the printing layer is printed as a reverse image. 3. The pressure-sensitive adhesive layer comprises a copolymer obtained by copolymerizing another vinyl monomer copolymerizable with a carboxyl group-containing vinyl monomer, a surfactant capable of imparting plasticity. The pressure-sensitive adhesive label according to claim 1, comprising a water-soluble or alkali-soluble pressure-sensitive adhesive layer added. 4. A label substrate, a first adhesive layer having hydrophilicity provided on one surface of the label substrate, and a printing layer printed on the surface of the first adhesive layer with a water-based ink. When,
An adhesive label, comprising: a protective film covered by the printing layer; and a second adhesive layer provided on the other surface of the label substrate and forming an adhesive surface to an adherend. 5. The first adhesive layer has an interface capable of imparting plasticity to a copolymer obtained by copolymerizing another vinyl monomer copolymerizable with a carboxyl group-containing vinyl monomer. The pressure-sensitive adhesive label according to claim 4, comprising a water-soluble or alkali-soluble pressure-sensitive adhesive layer to which an activator is added.