JP2757902B2 - Adhesive sheet or tape - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sheet or tape having a pressure-sensitive adhesive layer provided on one side of a resin sheet or tape support, and more particularly to an unwinding force, stain resistance and weather resistance. Regarding improvement.

[0002]

2. Description of the Related Art Conventionally, an adhesive tape formed by winding a resin tape-like support provided with a pressure-sensitive adhesive layer on one side into a roll with the pressure-sensitive adhesive layer inside, has been used for bonding, Packaging,
This adhesive tape is used for many applications such as insulation, and a release agent such as silicone resin is usually applied to the back surface of the support to adjust the unwinding force. However, if such a release treatment agent is not uniformly applied due to the influence of a plasticizer or the like in the resinous support or lacks the adhesiveness between the support and the release treatment agent, the pressure-sensitive adhesive is used at the time of rewinding. Problems such as transfer of the release agent to the layer surface and contamination of the adherend of the adhesive tape occur.

In order to solve the problem caused by the release agent, for example, as disclosed in JP-B-61-48556, a fatty acid amide is added to at least one of the support of the adhesive sheet or tape or the pressure-sensitive adhesive layer. To allow the fatty acid amide to bloom between the pressure-sensitive adhesive layer that comes into contact during winding and the back of the support, and the adhesive force between the bloomed fatty acid amide and the pressure-sensitive adhesive layer to be stretched during unwinding. There is a method in which a proper unwinding force characteristic is obtained by balancing with a force and without performing a peeling treatment.

[0004]

However, according to the above-mentioned conventional publication, there is a problem that if the amount of the fatty acid amide is increased in order to obtain proper rewinding characteristics, the adherend is contaminated. . On the other hand, if the amount of the fatty acid amide is small, proper rewinding characteristics cannot be obtained.

Further, when such an adhesive sheet or tape is irradiated with ultraviolet rays such as sunlight for a long time, the properties of the tape itself and the pressure-sensitive adhesive deteriorate, that is, the so-called weather resistance is poor.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a part of a fatty acid amide which is blended to impart an appropriate rewinding property to a support of an adhesive sheet or a tape. By substituting and incorporating an ultraviolet absorber, while suppressing the amount of the fatty acid amide and effectively preventing the contamination of the adherend, maintaining an appropriate rewinding force,
And to improve the weather resistance.

[0007]

Means for Solving the Problems To achieve the above object, a solution of the present invention according to claim 1 is to provide a resin sheet or tape support having a pressure-sensitive adhesive layer provided on one surface thereof. The pressure-sensitive adhesive layer is wound inside in a roll shape such that the pressure-sensitive adhesive layer is directly in contact with the back surface of the support, and the pressure-sensitive adhesive is wound on the support when the pressure-sensitive adhesive layer is wound. An adhesive sheet blended so as to provide a proper unwinding force property in which the fatty acid amide and the pressure-sensitive adhesive layer are bloomed on the back surface of the support in contact with the layer and the adhesive force between the fatty acid amide and the pressure-sensitive adhesive layer is balanced with the unwinding tensile force. In the tape, the support is replaced with a part of the fatty acid amide, and the ultraviolet absorber is maintained on the back surface of the support by blooming on the back surface of the support to maintain the proper rewinding property, and to provide weather resistance. It shall be blended.

According to a second aspect of the present invention, in the first aspect of the present invention, the resin constituting the sheet or tape-shaped support is made of a polyvinyl chloride resin.

According to the third aspect of the present invention, in the first aspect,
In the invention according to the second aspect, the blending amount of the ultraviolet absorber is
0.1 to 0.8 parts by weight based on 00 parts by weight, and the compounding amount of the fatty acid amide is 0.3 to
0.6 parts by weight.

[0010]

According to the above construction, in the first aspect of the present invention, the ultraviolet absorber and the fatty acid amide bloom on the back surface of the support in contact with the pressure-sensitive adhesive layer at the time of winding. Since the adhesive force with the pressure-sensitive adhesive layer is balanced with the tensile force at the time of unwinding, even if the release treatment agent layer is not provided on the back surface of the support, the unwinding force characteristics are appropriately maintained. .

In this case, when only the fatty acid amide is compounded, the amount of the compound may increase to cause contamination of the adherend. However, it is necessary to substitute a part of the fatty acid amide and compound the ultraviolet absorber. Thus, even if the amount of the fatty acid amide is reduced, the rewinding force characteristics are properly maintained. Therefore, by replacing the ultraviolet absorber with a part of the fatty acid amide and blending it with the support, the blending amount of the fatty acid amide can be reduced, and the contamination does not deteriorate.
In addition, deterioration of the adhesive sheet or tape due to ultraviolet rays such as sunlight is prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, when the resin constituting the sheet or tape-like support is a polyvinyl chloride resin, the unwinding force characteristics by the combination of an ultraviolet absorber and a fatty acid amide. The reconciliation becomes remarkable.

According to the third aspect of the present invention, in the first or second aspect,
In the invention, the compounding amount of the ultraviolet absorber is 0.1 to 0.8 parts by weight with respect to 100 parts by weight of the resin, and the compounding amount of the fatty acid amide is 0.3 to 0.6 parts by weight with respect to 100 parts by weight of the resin. In the case of a part, the effect of the invention of claim 1 or 2 becomes more remarkable.

[0014]

Embodiments of the present invention will be described below. As a support for the adhesive sheet or tape, polyvinyl chloride resin (average degree of polymerization: 1300) 100 parts Dioctyl phthalate (DOP) 30 parts Complex stabilizer 2 parts Fatty acid amide 0.5 part UV absorber (substituted hydroxy) A composition comprising 0.6 parts of phenylbenzotriazole was rolled with a calender roll (180 ° C.) to obtain a film having a thickness of 70 μm.

On the other hand, an acrylic pressure-sensitive adhesive composition comprising an acrylic rubber and a polyisoianate compound was prepared.

Next, the pressure-sensitive adhesive composition was applied to the above-mentioned film serving as a support so that the thickness after drying became 10 μm, and this was wound into a roll while drying.
Was obtained.

Then, the adhesive tape was rewound in an atmosphere of 20 ° C. at a speed of 300 mm / min, and the unwind force was measured to be 60 g / 25 mm width.

Further, as Examples 2 and 3 and Comparative Examples 1 to 4, films having a thickness of 70 μm were prepared with the amounts of fatty acid amides and ultraviolet absorbers as shown in Table 1 below. The amounts of the polyvinyl chloride resin (PVC resin), dioctyl phthalate (DOP) and the composite stabilizer were determined in Example 1.
Is the same as Thereafter, an adhesive tape was prepared under the same conditions as in Example 1 above, and tests for the unwinding force, contamination, and weather resistance of each of Examples and Comparative Examples were performed under the same conditions as in Example 1. went. The results are shown in Table 1 below.

[0019]

[Table 1] However, in Table 1 above, ◎ means that the characteristics are excellent,
○ indicates that the characteristics are good, and X indicates that the characteristics are not good.

From the above Table 1, the following is observed. In Examples 1 to 3, excellent or good characteristics are exhibited in any of the unwinding force, the stain resistance and the weather resistance. In particular, comparing Example 1 and Example 2, even at the same 0.5 parts by weight of the fatty acid amide, the greater the amount of the ultraviolet absorber, the better the weather resistance, but the contamination is hardly changed.

On the other hand, as in Comparative Example 1, even when the compounding amount of the fatty acid amide is 0.5 parts by weight, which is the same as that in Example 1, when the ultraviolet absorber is not compounded, the weather resistance is not good. Also, the rewinding force is not as excellent as in Example 1.

Further, as in Comparative Example 2, when only an ultraviolet absorber is blended and no fatty acid amide is blended, the rewinding force is not good. However, even if 1.0 part by weight of the ultraviolet absorber is blended, the contamination is good. On the other hand, as in Comparative Example 3, even when the compounding amount of the ultraviolet absorber is 1.0 part by weight, which is the same as in Comparative Example 2, when 0.8 part by weight of the fatty acid amide is further added, the unwinding force and weather resistance Excellent in pollution, but worse in pollution.

As a matter of course, as in Comparative Example 4, if neither an ultraviolet absorber nor a fatty acid amide is added,
It does not contaminate the adherend, but degrades the rewind force and weather resistance.

As described above, in Examples 1 to 3 of the present invention, the reason why the rewinding force is appropriate even when the release treatment agent layer is not provided on the back surface is that the ultraviolet absorber (in the above embodiment, (Substituted hydroxyphenylbenzotriazole) and a fatty acid amide bloom at the interface between the back surface of the support and the pressure-sensitive adhesive layer, and the adhesive force between the bloomed ultraviolet absorber and the fatty acid amide and the pressure-sensitive adhesive layer is reduced when unwinding. It is understood that it is balanced with the tensile force.

In this case, when the compound is a fatty acid amide alone, an increase in the compounding amount may cause contamination of the adherend. However, by adding an ultraviolet absorber instead of a part of the fatty acid amide, Even if the amount of amide is reduced, the rewinding force characteristics are properly maintained. Therefore, by replacing the ultraviolet absorber with a part of the fatty acid amide and blending to reduce the amount of the fatty acid amide, it is possible to prevent the deterioration of the contamination while properly maintaining the rewinding force, and prevent sunlight and the like. The deterioration of the adhesive sheet or tape due to ultraviolet rays can be effectively prevented.

Here, as can be seen from the results of Example 3, the amount of the fatty acid amide is preferably at least 0.3 part by weight based on 100 parts by weight of the resin, and the amount of the ultraviolet absorber is 100 parts by weight of the resin. 0.1 parts by weight or more with respect to However, as in Comparative Example 3, when the compounding amount of the fatty acid amide reaches 0.8 parts by weight and the compounding amount of the ultraviolet absorber reaches 1.0 part by weight, the contamination is deteriorated. In a more detailed experiment,
It was found that the fatty acid amide is preferably 0.6 parts by weight or less, and the ultraviolet absorber is preferably 0.8 parts by weight or less.

In the above embodiment, a polyvinyl chloride resin is used as the resin constituting the support of the adhesive sheet or the tape. However, the present invention is not limited to this embodiment. Good. However, when the resin constituting the support is a polyvinyl chloride resin and an ultraviolet absorber and a fatty acid amide are mixed with the resin, the rewinding force characteristics are remarkably optimized.

In the pressure-sensitive adhesive layer, an acrylic pressure-sensitive adhesive composition, a natural and / or synthetic rubber-based pressure-sensitive adhesive composition, or the like is used. As the fatty acid amide, stearic acid amide, palmitic acid, or the like is used. Acid amide, ricinoleic acid amide, oxystearic acid amide and the like are used.

Further, as the ultraviolet absorber, not only the above-mentioned substituted hydroxyphenylbenzotriazole, but also benzophenone type, salicylate type, other benzotriazole type, cyanoacrylate type and the like can be used.

[0030]

As described above, according to the first aspect of the present invention, a pressure-sensitive adhesive layer is provided on one surface of a resin-made sheet or tape-like support containing fatty acid amide. In an adhesive sheet or tape wound in a roll shape with the adhesive layer inside, a UV absorber is blended in the support in place of a part of the fatty acid amide, and the UV absorber and the fatty acid amide are wound. Occasionally, the backside of the support where the pressure-sensitive adhesive layer comes into contact is bloomed to balance the adhesive force with the pressure-sensitive adhesive layer with the tensile force during unwinding, reducing the amount of fatty acid amide and reducing contamination While effectively preventing the deterioration of the adhesive sheet, the deterioration of the adhesive sheet or the tape due to ultraviolet rays such as sunlight can be effectively prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, the resin constituting the sheet or tape-shaped support is a polyvinyl chloride resin, so that the ultraviolet absorbent and the fatty acid amide are blended. Appropriate rewinding force characteristics can be remarkably exhibited.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the amount of the ultraviolet absorber is 0.1 to 0.8 parts by weight based on 100 parts by weight of the resin, and The amount of the amide was adjusted to 0.1 with respect to 100 parts by weight of the resin.
Since the content is 3 to 0.6 parts by weight, the effect of the invention of claim 1 or 2 can be more remarkably exhibited.

Claims (3)

(57) [Claims] 1. A resin material having a pressure-sensitive adhesive layer on one side.
The sheet-shaped or tape-shaped support of
The pressure-sensitive adhesive layer is in direct contact with the back of the support with the
Rolled into a roll so that the support
Amide is supported by the above pressure-sensitive adhesive layer when it is wound.
Blooms the back of the body and makes pressure-sensitive contact with the fatty acid amide
Appropriate that the adhesive force with the adhesive layer balances the tensile force during unwinding
Adhesive sheet compounded to give excellent unwinding property
Alternatively, in the tape, the support is replaced with a part of the fatty acid amide to form a purple.
Bloom the outside line absorbent on the back of the support
Maintain proper unwinding force characteristics and provide weather resistance
Adhesive sheet or te
Soup. 2. The adhesive sheet or tape according to claim 1, wherein the resin constituting the sheet or tape-shaped support is a polyvinyl chloride resin. 3. The sheet or the adhesive tape according to claim 1, wherein the amount of the ultraviolet absorber is 0.1 to 100 parts by weight of the resin.
1 to 0.8 parts by weight, wherein the amount of the fatty acid amide is 0.3 to 0.6 parts by weight based on 100 parts by weight of the resin.