JPH0748660Y2 - Adhesive sheet - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pressure-sensitive adhesive sheet, and even if it is wound in a roll form before use, fine irregularities generated by curing the surface of the base material are present on the pressure-sensitive adhesive surface. The present invention relates to an adhesive sheet that is not transferred.

[Conventional technology]

On the surface of the cathode ray tube or on the front surface of the liquid crystal etc., the display surface such as the surface of the glass plate on which the transparent electrode is printed, for the purpose of preventing scratches on the glass surface and scattering of the glass when an object collides, Adhesive sheet is attached. The surface of the base material (for example, a soft plastic film) of this pressure-sensitive adhesive sheet is subjected to curing treatment by a method such as coating or plasma treatment in order to increase hardness. By this curing treatment, fine irregularities are formed on the surface of the base material. The fine irregularities are also effective for non-glare treatment of the display surface.

[Problems to be solved by the device]

Usually, this pressure-sensitive adhesive sheet is wound into a roll before its use. Therefore, as shown in FIG. 2, the fine unevenness of the base material 5 which has been cured by the winding pressure is transferred to the pressure-sensitive adhesive layer 7 through the release material 6, and the surface of the pressure-sensitive adhesive layer 7 is shaken. It becomes "skin-like". From such an adhesive sheet,
When the peeling material 6 is peeled off and attached to a display surface such as a cathode ray tube, the light from the display screen is irregularly reflected by the adhesive surface of the yuzu skin, and the display information becomes difficult to see. Further, if the pressure-sensitive adhesive surface has an orange skin appearance, air may be trapped when the pressure-sensitive adhesive sheet is attached to the display surface, and the mixing of the air makes it difficult to view the display information.

The pressure-sensitive adhesive sheet thus wound in a roll form is used. As a countermeasure against this, various disadvantages occur as described above, so unless the adhesive sheets are processed into a flat sheet shape and stacked on several sheets or more, it goes without saying that the fine irregularities of the cured base material will be on the adhesive surface. It is not transcribed, and it does not look like yuzu skin.
However, in this case, the pressure-sensitive adhesive sheet attached to the display surface needs to be cut according to the model, and the production efficiency is very poor. In addition, since the adhesive sheet is cut into pieces, the loss is large and the cost is high.

Therefore, an object of the present invention is to solve the above-mentioned problems, and when the roll form is adopted, the fine unevenness of the base material is transferred so that the adhesive surface does not become rough and the production efficiency is high and the adhesive cost is low. To provide a seat.

[Means for Solving the Problems]

In order to achieve such an object, the pressure-sensitive adhesive sheet according to the present invention comprises a first release material made of synthetic paper having a smooth surface,
A second release material made of polyethylene terephthalate provided on the first release material, an adhesive layer applied to the second release material, and a cured surface provided on the adhesive layer with a fine surface. It has a base material having irregularities and is wound in a roll shape.

[Action]

According to the present invention, the pressure-sensitive adhesive sheet is wound into a roll shape before use, but the pressure-sensitive adhesive surface does not become a scaly skin. There is no irregular reflection on the surface, and there is no possibility of air being entrapped during sticking, making it easier to see the display information.

〔Example〕

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

Embodiment FIG. 1 is a sectional view showing an embodiment of the present invention.

Reference numeral 1 is a base material made of PET (polyethylene terephthalate) whose surface is cured by plasma treatment or the like, 2 is a transparent adhesive layer made of an acrylic adhesive, and 4 is a 170 μm-thick synthetic paper (internal paper made of polypropylene) 3 is a second release material made of PET having a thickness of 38 μm.

Before use, the roll is wound into a roll, that is, the uneven surface of the base material 1 and the surface of the first release material are in contact with each other, and when the pressure-sensitive adhesive sheet of this example is used, the pressure-sensitive adhesive sheet is spread to form a sheet-like display screen. When you put it on, the yuzu skin was not observed on the adhesive side,
No air entrapment was observed during application. Furthermore, the light from the display screen was not diffusely reflected on the adhesive surface, and the display information was easy to see.

In this example, a release material was laminated. The reason for stacking is as follows. The second release material made of PET acts to make the pressure-sensitive adhesive surface smooth and to prevent the pressure-sensitive adhesive sheet from bending and warping to increase the strength of the pressure-sensitive adhesive sheet. The release material plays the role of absorbing fine irregularities on the surface of the substrate which has been subjected to the curing treatment. In addition, since the surface of the synthetic paper is fairly smooth, fine irregularities on the surface of the base material are not transferred to the pressure-sensitive adhesive surface through PET which is the second release material.

Comparative Example 1 The same materials as those used in the examples were used for the base material and the adhesive, and PET having a different thickness of 38, 50, 75, 100 and 125 μm was used as the release material. Before use, when the pressure-sensitive adhesive sheet of this comparative example, which had been rolled into a roll, was spread and formed into a sheet shape and attached to the display surface, yuzu skin was observed on the pressure-sensitive adhesive surface, and the display information was difficult to see. This comparative example is structurally the same as the conventional example, and an experiment was conducted by changing the thickness, but the object of the present invention could not be achieved.

Comparative Example 2 The same material as that of the example was used as the base material and the adhesive, and only the 170 μm-thick synthetic paper used in the example was used as the release material. Prior to use, the pressure-sensitive adhesive sheet of this comparative example, which had been rolled into a roll, was spread to form a sheet, and when it was attached to the display surface, yuzu skin was observed on the pressure-sensitive adhesive surface, and the display information was difficult to see. If synthetic paper is used, it is possible to absorb fine irregularities on the surface of the base material, but with only synthetic paper, the very fine irregularities on the surface cause the adhesive surface to become itchy skin, so with the adhesive sheet of this comparative example However, it cannot be attached flat on the display surface.

Comparative Example 3 The same material as in Example was used as the base material and the adhesive, PET having a thickness of 38 μm was used as the second release material, and 50% was used as the first release material.
And PVC (polyvinyl chloride) protective tapes with different thickness of 120 μm were used. Before use, two types of pressure-sensitive adhesive sheets of this comparative example, which were wound in a roll shape, were spread to form a sheet, and when they were attached to the display surface, yuzu skin was observed on the pressure-sensitive adhesive surface, and the display information was difficult to see. In this comparative example, a release material was laminated, but the protective tape has absorbency, but the fisheye, uneven thickness, etc. of the protective tape itself causes the adhesive surface to become orange skin, thus achieving the object of the present invention. I couldn't.

Comparative Example 4 The same materials as those used in the examples were used as the base material and the pressure-sensitive adhesive, PET having a thickness of 38 μm was used as the second release material, and foamed polyethylene having a thickness of 1000 μm was used as the first release material. Before use, the pressure-sensitive adhesive sheet of this comparative example, which had been rolled into a roll shape, was spread to form a sheet, and when it was attached to the display surface, yuzu skin was observed on the pressure-sensitive adhesive surface, and the display information was difficult to see. Similar to synthetic paper, foamed foam absorbs irregularities on the surface of the base material, but the surface is not smooth due to foaming and the irregularities are transferred to the adhesive surface, which is not preferable. .

Comparative Example 5 The same material as in Example was used as the base material and the adhesive, and a double-sided polyethylene laminated paper having a thickness of 180 μm was used as a release material. Before use, the pressure-sensitive adhesive sheet of this comparative example, which had been rolled into a roll shape, was spread to form a sheet, and when it was attached to the display surface, yuzu skin was observed on the pressure-sensitive adhesive surface, and the display information was difficult to see. The double-sided polyethylene laminated paper has absorbability as in the case of using only synthetic paper (Comparative Example 2), but it is not preferable because the unevenness of the surface of the polyethylene laminated paper causes the adhesive surface to become itchy.

From the above experiment, it is preferable that the release material is laminated, and the first release material is synthetic paper that has absorptivity for fine irregularities of the substrate and has a smooth surface. As the first release material, in addition to synthetic paper, high-quality paper or coated paper is preferable because it has absorbability for fine irregularities on the surface of the substrate and has a smooth surface.

[Effect of device]

As described above, according to the present invention, the pressure-sensitive adhesive sheet is wound into a roll shape before use, but since the pressure-sensitive adhesive surface does not become a scaly skin, by sticking the pressure-sensitive adhesive sheet on the display surface such as a cathode ray tube, the display screen Light does not diffusely reflect on the pressure-sensitive adhesive surface, and there is no possibility of air being entrapped during sticking, so that the display information is easy to see.

Further, according to the present invention, the adhesive sheet is in the form of a roll before use, and unlike the conventional example, it is not flat, so there is no need to cut it according to the model, production efficiency increases, loss is eliminated and cost is low. Become.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a partial sectional view of a conventional pressure-sensitive adhesive sheet in a roll form. 1 ... Substrate, 2 ... Adhesive layer, 3 ... Second release material, 4
…… First release material, 5 …… Base material, 6 …… Peeling material, 7 ……
Adhesive layer.

Claims (1)

[Scope of utility model registration request] 1. A first release material made of synthetic paper having a smooth surface, a second release material made of polyethylene terephthalate provided on the first release material, and applied to the second release material. A pressure-sensitive adhesive sheet, comprising: a pressure-sensitive adhesive layer formed on the pressure-sensitive adhesive layer; and a base material having a fine unevenness on its surface, which is provided on the pressure-sensitive adhesive layer, and is wound into a roll.