JPH0820753A - Application sheet - Google Patents

Abstract

PURPOSE:To prepare an application sheet which has good adhesion to the pressure-sensitive adhesive sheet during the transfer and can be easily peeled off therefrom after the pressure-sensitive adhesive sheet has been stuck to the adhered by forming a layer of a hot-melt adhesive containing thermally expansible microcapsules on either surface of a synthetic resin sheet. CONSTITUTION:An application sheet 1 prepared by forming a layer 3 of a hot-melt pressure-sensitive adhesive containing thermally expansible microcapsules 31 on either surface of a synthetic resin sheet 2. It is desirable that the resin sheet 2 used has a low elongation and a suitable nerve, and examples of such sheets are one made of a polyester and an oriented polypropylene. The hot-melt pressure-sensitive adhesive contains a thermoplastic resin as the base polymer and other main components including a wax, a plasticizer, a tackifying resin, an oxidation and decomposition inhibitor, etc. The amount of the microcapsules 31 added to the hot-melt pressure-sensitive adhesive is desirably 0.5-5 pts.wt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an application sheet for transferring a pressure-sensitive adhesive sheet having a surface of a substrate sheet embossed.

[0002]

2. Description of the Related Art In recent years, transparent glass windows and the like have been made concealing to prevent see-through, and colored or roughened synthetic resin adhesive sheets have been cut out and attached in a figure shape for the purpose of decoration. There is. To attach the adhesive sheet cut out in such a shape to the glass plate, a cutting machine controlled by a computer cuts the adhesive sheet into a shape and removes unnecessary parts other than figures (hereinafter referred to as "scraping work"). After that, transfer to a glass plate using an application sheet.

Many techniques relating to application sheets have been introduced, but an application sheet using a heat-sealing type pressure-sensitive adhesive is described in JP-A-2-16277.

Further, in Japanese Patent Publication No. 5-71246, a pressure-sensitive adhesive layer containing heat-expandable microcapsules is formed on a tape base material at the same time as or after heating to form a pressure-sensitive adhesive layer.
An adhesive tape in which thermally expandable microcapsules are expanded and foamed is described.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the one disclosed in Japanese Patent Publication No. 77 uses a heat-sealing type adhesive, only a necessary portion of the pressure-sensitive adhesive sheet is heated from above the application sheet and heat-fused to the application sheet so that it can be adhered and transferred. It does not require scum removal work.

However, the pressure-sensitive adhesive layer surface of the application sheet is smooth, and when it is applied to a pressure-sensitive adhesive sheet having an embossed surface, the uneven surface of the pressure-sensitive adhesive sheet and the pressure-sensitive adhesive layer of the application sheet make point contact. The adhesiveness becomes extremely low, and the release paper on which the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet is laminated cannot be separated from the pressure-sensitive adhesive layer, or even if it is peeled off, it may fall off before being transferred to the glass plate.

An object of the present invention is to solve the above-mentioned conventional problems and to provide an application sheet which has good adhesiveness to an adhesive sheet during transfer and is easily peeled off after being attached to an adherend.

[0008]

The application sheet of the present invention according to claim 1 is characterized in that a heat-fusion adhesive layer containing heat-expandable microcapsules is provided on one surface of a synthetic resin sheet. It is what

The application sheet of the present invention as set forth in claim 2 has a pressure-sensitive adhesive layer surface obtained by applying and drying a pressure-sensitive adhesive containing a heat-expandable microcapsule on the uneven surface of a release paper having one surface having a peelable uneven surface. , A synthetic resin sheet is stuck together.

It is preferable that the synthetic resin sheet used for the application sheet according to the first and second aspects has a small elongation and an appropriate elasticity, and examples thereof include polyester, stretched polypropylene and the like. To be

The heat-sealing type pressure-sensitive adhesive layer provided on one surface of the synthetic resin sheet is generally used, and is composed of a thermoplastic resin as a base polymer, and waxes, plasticizers, tackifying resins, oxidation and decomposition prevention. In the present invention, the heat-fusion-type pressure-sensitive adhesive layer contains heat-expandable microcapsules.

The heat-expandable microcapsules are microspheres having a vinylidene chloride-acrylonitrile copolymer as a shell wall and containing a hydrocarbon of a volatile gas and having a particle size of 10 to 20 μm. Volume) is about 7
The number is 0 times, and a large number of closed cells can be formed in the pressure-sensitive adhesive layer by swelling. For example, Matsumoto Yushi-Seiyaku Co., Ltd.'s trade name “Matsumoto Microsphere” can be mentioned.

The amount of the heat-expandable microcapsules mixed with the heat-fusion adhesive layer is preferably 0.5 to 5 parts by weight. On the surface of the synthetic resin sheet, in order to form a heat-sealing adhesive layer containing heat-expandable microcapsules, a solution of this adhesive in a solvent may be directly applied to the synthetic resin sheet and dried, If necessary, a release paper may be laminated on the pressure-sensitive adhesive layer. Alternatively, a solution of the above-mentioned pressure-sensitive adhesive may be applied and dried on the uneven surface of the release paper, and then a synthetic resin sheet may be laminated thereon. In any case, the drying is performed at a temperature at which the heat-expandable microcapsules do not foam.

When the pressure-sensitive adhesive layer thus formed is placed on the embossed surface of the embossed pressure-sensitive adhesive sheet and the synthetic resin sheet surface of the application sheet is heated and pressure-bonded, the heat-sealing type pressure-sensitive adhesive is activated and its adhesive force is increased. At the same time, the heat-expandable microcapsules expand and foam, and the pressure-sensitive adhesive layer expands and softens to fill the recesses on the embossed surface. As a result, the pressure-sensitive adhesive layer and the irregularities on the embossed surface are in a nearly adhesive state, and the adhesive area becomes large, so that the adhesive force required for transfer is obtained.

Since the adhesive force of the pressure-sensitive adhesive layer used for the application sheet is originally lower than that of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet, after the pressure-sensitive adhesive sheet adhered to the application sheet is attached to the adherend. The application sheet can be easily peeled off.

Next, the application sheet according to claim 2 is a solvent-based adhesive such as acrylic or rubber having an adhesive strength at room temperature as a pressure-sensitive adhesive, and the same heat-expandable microcapsule as that of claim 1. A capsule is contained, and this pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive to the peelable uneven surface of the release paper and drying it.

As the release paper, polyethylene is laminated on one side or both sides of high-quality paper, and the laminated surface is subjected to a release treatment with silicone, or a synthetic resin film such as a polyester film is subjected to the same release treatment. The release-treated surface is an uneven surface that is larger than the usual embossing surface. The depth of the unevenness is preferably about 50 to 100 μm.

By applying a liquid adhesive to the uneven surface of the release paper, the adhesive easily enters the uneven surface of the release paper, and drying it can make the surface of the adhesive layer uneven. it can. At the same time, the heat for drying causes the heat-expandable microcapsules in the pressure-sensitive adhesive layer to expand and foam. As a result, countless fine irregularities are further generated on the irregular surface formed on the surface of the pressure-sensitive adhesive layer due to the foaming of the heat-expandable microcapsules, and the thickness of the entire pressure-sensitive adhesive layer is increased.

Such a pressure-sensitive adhesive layer in which a large number of smaller unevennesses are formed on a large unevenness surface is excellent in elasticity and flexibility, is well adapted to the unevenness due to embossing on the surface of the pressure-sensitive adhesive sheet, and increases the adhesive area. Sufficient adhesive force for transfer is obtained. A synthetic resin sheet is laminated on the pressure-sensitive adhesive layer surface formed on the release paper surface. As this synthetic resin sheet, the same one as used in the invention of claim 1 is used.

In the application sheet thus formed, the release paper is peeled off, the pressure-sensitive adhesive layer surface is superposed on the pressure-sensitive adhesive sheet, and after pressure bonding, the pressure-sensitive adhesive sheet is attached to the adherend together with the application sheet, and then only the application sheet is peeled off. . Also in this case, since the adhesive force of the adhesive layer of the application sheet is lower than that of the adhesive layer of the adhesive sheet, it can be easily peeled from the adhesive sheet.

[0021]

The application sheet according to claim 1 is superposed on the embossed surface of the embossed adhesive sheet,
When heat compression is applied from the synthetic resin sheet side of the application sheet, the heat fusion adhesive activates and develops adhesive force,
At the same time, the heat-expandable microcapsules expand and foam, and the pressure-sensitive adhesive layer expands and softens to fill the recesses on the embossed surface.
As a result, the pressure-sensitive adhesive layer and the irregularities on the embossed surface are in a nearly adhesive state, and the adhesive area becomes large, so that the adhesive force required for transfer is obtained.

Since the adhesive force of the pressure-sensitive adhesive layer used for the above-mentioned application sheet is originally lower than that of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet, after the pressure-sensitive adhesive sheet adhered to the application sheet is attached to the adherend. , The application sheet can be easily peeled off.

In the application sheet according to the second aspect, by applying a liquid adhesive to the uneven surface of the release paper, the adhesive easily enters the uneven surface of the release paper, and when this is dried, the adhesive layer of the adhesive layer is formed. The surface is uneven. At the same time, the heat for drying causes the heat-expandable microcapsules in the pressure-sensitive adhesive layer to expand and foam. As a result, countless fine irregularities are generated on the irregular surface formed on the surface of the pressure-sensitive adhesive layer due to the foaming of the heat-expandable microcapsules, and the thickness of the entire pressure-sensitive adhesive layer is increased.

Such a pressure-sensitive adhesive layer in which a large number of smaller unevennesses are formed on a large unevenness surface is excellent in elasticity and flexibility, is well adapted to the unevenness due to embossing on the surface of the pressure-sensitive adhesive sheet, and increases the adhesive area. Sufficient adhesive force for transfer is obtained.

[0025]

Embodiments of the application sheet of the present invention will be described below with reference to the drawings. (Example 1) FIG. 1 is a cross-sectional view showing an example of the application sheet according to claim 1, wherein the application sheet 1 has an ethylene-vinyl acetate copolymer resin (Mitsui DuPont Poly Made by Chemical Co., product name: EVAFLEX, solid content 25%) 1
Thermally expandable microcapsules 31 (manufactured by Matsumoto Yushi-Seiyaku Co., Ltd., trade name: Matsumoto Microsphere-F3)
0) A heat-fusion-type pressure-sensitive adhesive layer 3 having a thickness of 25 μm, which is obtained by applying a mixed solution of 2.5 parts by weight onto a release paper 4 and drying the laminated paper, is laminated.

The above-mentioned application sheet was laid on a pressure-sensitive adhesive sheet which was not cut and scraped in the figure shape, and the application sheet was heat-pressed from above only on the figure-shaped pressure-sensitive adhesive sheet to be transferred (not shown). Next, when this application sheet was lifted, only the adhesive sheet in the shape of the figure was adhered to the application sheet and taken up, and after being transferred to the adherend, only the application sheet could be easily peeled off.

Comparative Example 1 An application sheet similar to that of Example 1 except that only an acrylic adhesive (solid content 25%) was used as the adhesive. Since this adhesive exhibits adhesive strength at room temperature, it was not possible to transfer only the figure-shaped portion unless the pressure-sensitive adhesive sheet cut into the figure was scraped off.

(Comparative Example 2) An application sheet similar to that of Example 1 was prepared except that the thermally expandable microcapsules were not used. In this product, the application sheet is superposed on an adhesive sheet, and the application sheet can be transferred by heating and press-bonding only to the figure-shaped adhesive sheet to be transferred, and no scraping work is required.

With respect to the application sheets of Example 1 and Comparative Example 1 described above, the thickness and adhesive strength of the adhesive layer were measured. Also, embossed adhesive sheet (made by Sekisui Chemical Co., Ltd.,
Product name: Hull color glass decorative sheet) 25 m long
It was cut out by using a computer-controlled cutting machine (manufactured by Sekisui Chemical Co., Ltd., trade name: Haruji-kun) into 10 characters of “Aya Morimori Ayumi Swimsuit” in m size. In the case of the application sheet of Example 1, the above application sheet was laid on this without removing the dust, and only the character portion was heated and pressed from the top of the application sheet and transferred to the glass plate. In the case of the application sheet of Comparative Example 1, after removing dust, the application sheet was attached to characters and transferred. Table 1 shows the above results.

[0030]

[Table 1]

As can be seen from Table 1, in Example 1, the pressure-sensitive adhesive layer has a thickness four times as large as the pressure-sensitive adhesive layer expands, and therefore the pressure-sensitive adhesive layer is rich in elasticity and flexibility, and the embossed surface of the pressure-sensitive adhesive sheet. Since it is well compatible with, the adhesive strength was high and all 10 characters were transferred in perfect condition. In contrast, Comparative Example 1
It can be seen that the transfer results of # 2 to # 2 are extremely poor because the adhesive strength is low.

(Embodiment 2) FIG. 2 is a cross-sectional view showing an embodiment of the application sheet according to the present invention. The application sheet 5 is a release paper having a gloss value of 2% and one surface of which is subjected to a release treatment to form an uneven surface 81. On 8 sides, 100 parts by weight of acrylic adhesive and heat-expandable microcapsules (Matsumoto Yushi-Seiyaku Co., Ltd., trade name: Matsumoto Microsphere-F3
0) 2.5 parts by weight of a mixed solution is applied to release paper and dried to form a heat-fusion adhesive layer 7 having an average thickness of 25 μm. The heat-sealing adhesive layer 7 is heated at 120 ° C. for 4 minutes to expand and expand the heat-expandable microcapsules to have an average thickness of 110 μm. Fine air bubbles 72 are formed, and innumerable fine irregularities 71 due to broken cells are formed on the large uneven surface of the interface of the heat-sealing adhesive layer 7 with the release paper 8.
Further, the surface of the heat-fusion adhesive layer 7 has a thickness of 50 μm.
The stretched polypropylene film 6 is laminated.

(Comparative Example 3) An application sheet similar to that of Example 2 was used except that a release paper having a smooth release surface was used.

(Comparative Example 4) An application sheet similar to that of Example 1 was prepared except that the thermally expandable microcapsules were not used.

(Comparative Example 5) An application sheet similar to that of Example 2 was used except that the thermally expandable microcapsules were not used and the release paper had a smooth release surface.

The application sheets of Example 2 and Comparative Examples 3 to 5 were evaluated in the same manner as in Example 1 and Example 2. Table 2 shows the results.

[0037]

[Table 2]

As is clear from Table 2, in Example 2, since the adhesive strength to the embossed adhesive sheet is strong, the transferability of the adhesive sheet is excellent and it is easily peeled off from the glass plate of the adherend. be able to. However, Comparative Example 3
All of Nos. 5 to 5 have low adhesive strength to the embossed surface of the pressure-sensitive adhesive sheet and poor transferability, and are difficult to peel off when the pressure-sensitive adhesive layer comes into contact with the glass plate.

[0039]

The application sheet of the present invention has the constitution described above. In the application sheet according to claim 1, the pressure-sensitive adhesive layer and the unevenness of the embossed surface are in a nearly adhesive state, and the adhesive area is large. It has excellent transferability. After attaching the adhesive sheet to the adherend,
The application sheet can be easily peeled off.

In the application sheet according to claim 2, the pressure-sensitive adhesive layer is rich in elasticity and flexibility, conforms well to unevenness due to embossing on the surface of the pressure-sensitive adhesive sheet, and obtains sufficient pressure-sensitive adhesive force for transfer. Has excellent sex. or,
It can be easily peeled off after being attached to an adherend.

[0041]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the application sheet of the present invention according to claim 1.

FIG. 2 is a sectional view showing an embodiment of the application sheet of the present invention according to claim 2.

[Explanation of symbols]

 1,5: Application sheet 2,6: Stretched polypropylene sheet 3,7: Thermal fusion adhesive layer 4,8: Release paper 31: Thermally expandable microcapsules 71: Fine irregularities 72: Bubbles 81: Uneven surface

Claims (2)

[Claims] 1. An application sheet comprising a synthetic resin sheet and a heat-fusion adhesive layer containing heat-expandable microcapsules provided on one surface of the synthetic resin sheet. 2. A synthetic resin sheet is adhered to the pressure-sensitive adhesive layer surface obtained by applying and drying a pressure-sensitive adhesive containing heat-expandable microcapsules on the uneven surface of a release paper having a peelable uneven surface on one side. An application sheet characterized by that.