JPH0790231A - Tacky adhesive sheet - Google Patents

Abstract

PURPOSE:To provide a tacky adhesive sheet capable of easily adjusting the position in the case of pasting on an adherend and enabling the repasting even if the adhesive force is increased by the lapse of time. CONSTITUTION:This tacky adhesive sheet is produced by calendering a composition composed of 100 pts.wt. of a vinyl chloride resin, 35 pts.wt. of a polyester plasticizer, 11 pts.wt. of a metallic stabilizer and 35 pts.wt. of a pigment to form a colored soft vinyl chloride resin sheet 1 having a thickness of 100mum, applying irregularity 2 of 15mum deep on one surface of the sheet 1, applying an acrylic tacky adhesive layer 3 having a thickness of 30mum to the irregular face 2 by a transfer method and laminating a releasing paper 4 to the tacky adhesive layer 3.

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 sheet which can be easily adjusted in position immediately after being stuck and does not remain on the adherend even if it is stuck again after a lapse of time.

[0002]

2. Description of the Related Art Conventionally, a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer provided on one surface of a sheet substrate for decoration has been widely used in various fields for outdoor decoration, indoor decoration, and display. There is. As such a sheet base material, a soft vinyl chloride resin sheet is often used in terms of weather resistance, moldability, adhesiveness and the like.

In order to provide a pressure-sensitive adhesive layer on the above-mentioned sheet substrate, a pressure-sensitive adhesive is applied to release paper and dried to form a pressure-sensitive adhesive layer,
A transfer method in which the pressure-sensitive adhesive layer is attached to the surface of the sheet base material has been conventionally performed. Further, in order to enhance the adhesiveness between the sheet base material and the pressure-sensitive adhesive layer, it is also practiced to provide an undercoating agent layer on the sheet base material and then laminate the pressure-sensitive adhesive layer.

When sticking this kind of adhesive sheet to an adherend, the initial adhesive force is weakened for position adjustment and re-sticking,
A position-adjustable adhesive tape that enhances the adhesive force thereafter is described in JP-A-3-181578. The thing described in the above-mentioned publication is glass particles in the protrusions of the pressure-sensitive adhesive uniformly distributed on the pressure-sensitive adhesive layer surface provided on one surface of the resin sheet or the like,
Fine particles such as ceramic particles and polymer particles are attached, and position adjustment is made possible by weakening the initial adhesive force to the adherend by the particle group, and then pressure is applied to the resin sheet to push the fine particles into the adhesive layer. , To strongly adhere the adhesive to the adherend.

[0005]

The device described in the above publication makes it easy to adjust the position at the time of attachment by the fine particles protruding from the surface of the adhesive layer, but after the adhesive layer and the adherend are adhered, When the resin sheet is peeled off and then reattached after a lapse of time (after about 24 hours have passed), since the resin sheet and the adhesive layer are laminated in a plane, this interfacial adhesive force is applied to the adherend and the adhesive agent. It tends to be weaker than the adhesive force with the layer, the resin sheet is peeled off from the adhesive layer, and adhesive residue is left on the adherend, leaving the adhesive layer.

Further, to provide a primer layer on the sheet substrate,
An apparatus and a process for applying and drying a solution of an undercoating agent dissolved in an organic solvent are required, and when the sheet base material is a vinyl chloride resin, a part of the solution is impregnated in the sheet base material, and a considerable amount is required for drying. There is a problem that it requires time and heating.

The present invention solves the above-mentioned conventional problems and provides a pressure-sensitive adhesive sheet which can be easily repositioned when it is attached to an adherend and can be reattached even if the adhesive strength increases with time. With the goal.

[0008]

The pressure-sensitive adhesive sheet of the present invention comprises:
One side of a soft vinyl chloride resin sheet is embossed, a pressure-sensitive adhesive layer is provided on the embossed surface, and the pressure-sensitive adhesive layer surface is formed with unevenness by the embossing. Is.

The soft vinyl chloride resin sheet (hereinafter referred to as "resin sheet") used in the present invention may be one produced by calender molding, and the vinyl chloride resin may be a plasticizer, a diluting solvent, a stabilizer, a pigment. It may be produced by a casting method in which a vinyl chloride organosol obtained by mixing the above components is cast on the surface of the process paper to form a film.

The thickness of the resin sheet is 40 to 300 μm
Those in the range of are used. When the thickness is less than 40 μm, the strength is low and the film is easily broken, and when the amount of the pigment is small, the color of the adherend may be seen through. On the other hand, if it is thicker than 300 μm, it becomes difficult to attach it to an adherend having a curved surface.

Due to the unevenness formed on one surface of the resin sheet, the pressure-sensitive adhesive layer formed on that surface conforms to the uneven shape, and the adhesive area with the resin sheet becomes large, and the adhesive force due to the anchoring effect becomes large. Therefore, it is preferable that the irregularities are formed as densely as possible. The depth of the irregularities is preferably in the range of 5 to 20 μm, more preferably 10 to 15 μm. If the depth is less than 5 μm, the anchoring effect of the pressure-sensitive adhesive cannot be expected, and if it exceeds 20 μm, unevenness appears on the surface opposite to the surface, and the glossiness of the surface decreases.

It is necessary that the pressure-sensitive adhesive layer provided on the uneven surface is in the recess, and the surface of the pressure-sensitive adhesive layer is uneven according to the shape of the unevenness. Since the surface of the pressure-sensitive adhesive layer is uneven, when the surface of the pressure-sensitive adhesive layer is superposed on the adherend, the protrusions are mainly involved in the adhesion with the adherend, so it is easy to remove and the position adjustment of the pressure-sensitive adhesive sheet is easy. You can

When the pressure-sensitive adhesive layer is applied to the embossed surface of the liquid resin sheet, it enters the recesses, but the surface is almost smooth and cannot be formed into irregularities. Therefore, in order to form the pressure-sensitive adhesive layer in a concavo-convex shape, a pressure-sensitive adhesive is separately applied to the surface of the release paper to form a pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer is superposed on a resin sheet and pressed, and then the release paper is pressed. It is preferable to use a transfer method of peeling.

[0014]

In the pressure-sensitive adhesive sheet of the present invention, one surface of the resin sheet is embossed, and the pressure-sensitive adhesive layer surface provided on the embossed surface has irregularities formed by embossing. When applied, the convex portion of the pressure-sensitive adhesive layer mainly participates in the adhesion to the adherend, so that it can be easily removed from the adherend and the position of the pressure-sensitive adhesive sheet can be easily adjusted.
In addition, since the pressure-sensitive adhesive layer is provided on the embossed surface of the resin sheet, the pressure-sensitive adhesive layer has excellent anchoring properties to the resin sheet, and adhesive does not remain on the adherend even when peeled off when re-bonding after a lapse of time.

[0015]

EXAMPLES Examples of the pressure-sensitive adhesive sheet of the present invention will now be described with reference to the drawings. (Example 1) FIG. 1 is a cross-sectional view showing an example of the pressure-sensitive adhesive sheet of the present invention. From 100 parts by weight of vinyl chloride resin, 35 parts by weight of polyester plasticizer, 11 parts by weight of metal stabilizer, and 35 parts by weight of pigment. Colored flexible vinyl chloride resin sheet 1 having a thickness of 100 μm and formed by calendering the composition
The unevenness 2 having a depth of 15 μm is formed on one surface of the unevenness 2.
An acrylic pressure-sensitive adhesive layer 3 having a thickness of 30 μm is provided on the surface by a transfer method, and the surface of the pressure-sensitive adhesive layer 3 has an uneven shape similar to the unevenness 2. Further, a release paper 4 is laminated on the convex portion of the adhesive layer 3. The unevenness 2 is formed by passing a soft vinyl chloride resin sheet through an embossing roll.

(Example 2) The same constitution as the pressure-sensitive adhesive sheet of Example 1 (not shown) except that the thickness of the soft vinyl chloride resin sheet was 50 μm and the thickness of the pressure-sensitive adhesive layer was 30 μm. However, the soft vinyl chloride resin sheet used here comprises 100 parts by weight of vinyl chloride resin, 35 parts by weight of polyester plasticizer, 11 parts by weight of metal stabilizer, 35 parts by weight of pigment, and 60 parts by weight of diluent solvent. It was obtained by casting a vinyl chloride organosol on the release treated surface of process paper. By passing through an embossing roll together with the process paper after heating and drying the cast resin composition, unevenness is provided on the resin sheet surface, an adhesive layer is provided on the uneven surface by a transfer method, and the adhesive layer surface is provided. After the release paper is laminated, the process paper is peeled off.

(Comparative Example 1) A pressure-sensitive adhesive sheet having the same structure as in Example 1 was prepared except that no irregularities were formed on the soft vinyl chloride resin sheet.

(Comparative Example 2) A pressure-sensitive adhesive sheet having the same structure as that of Example 2 except that no unevenness was formed on the soft vinyl chloride resin sheet.

Performance Evaluation (1) Adhesive Residue The pressure-sensitive adhesive sheets of Examples and Comparative Examples were 25 mm × 100 mm.
Cut out to the size of, and apply 2kg of pressure to the glass plate and acrylic resin plate with a roller, and after 20 minutes,
After a day, it was peeled off and the state of adhesive residue on the adherend was observed. The results are shown in Table 1. (2) Surface glossiness The surface glossiness of the surface opposite to the embossed surface of the adhesive sheet is
According to the gloss measurement method of the optical characteristic test method for plastics specified in JIS K7105, a 60-degree specular gloss can be obtained by Horiba Ltd. "Handy Gloss Checker IG3".
20 ". The results are shown in Table 1.

[0020]

[Table 1]

As is clear from Table 1, Examples 1 and 2
No adhesive residue was left on the adherend after peeling after a lapse of time. On the other hand, in Comparative Examples 1 and 2, the adhesive residue becomes remarkable when peeled off after one day. In addition, Example 1,
2 has almost the same surface gloss as conventional products,
It can be seen that a smooth surface is obtained.

[0022]

The pressure-sensitive adhesive sheet of the present invention has the above constitution,
The pressure-sensitive adhesive layer surface is formed into an uneven shape, and when the pressure-sensitive adhesive layer is attached to the adherend, since the convex portion of the pressure-sensitive adhesive layer mainly contributes to the adhesion with the adherend, it is easy to remove from the adherend and The position can be adjusted easily. Further, the pressure-sensitive adhesive layer has excellent anchoring properties to the resin sheet, and no adhesive remains on the adherend even when peeled off when it is reattached after a lapse of time.

[0023]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the pressure-sensitive adhesive sheet of the present invention.

[Explanation of symbols] 1: Soft vinyl chloride resin sheet 2: Concavity and convexity 3: Adhesive layer 4: Release paper

Claims (1)

[Claims] 1. A soft vinyl chloride resin sheet is embossed on one surface, an adhesive layer is provided on the embossed surface, and the embossed unevenness is formed on the adhesive layer surface. Adhesive sheet characterized by.