JPH09111205A - Double-coated tacky sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a double-coated tacky sheet excellent in handleability, not causing removal of release paper when drawn out as a wound substance. SOLUTION: This double-coated tacky sheet is obtained as a wound material by laminating release papers 10 to both sides of a tacky agent layer 4. The release paper 10 to be wound at least at the outer side of the wound material 7 is a nonwoven fabric 1 in which the ratio of the amounts of the yarns arranged in the length direction and the width direction is 1:1 to 1:8.

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 with double-sided release paper, wherein release paper is laminated on both sides of a pressure-sensitive adhesive layer, and the release paper floats even when it is wound into a roll. The present invention relates to a double-sided PSA sheet that does not occur and does not hinder subsequent processing.

[0002]

2. Description of the Related Art Conventionally, for example, when manufacturing an IC card in which an integrated circuit is incorporated in a plastic card or a printed wiring board in which the integrated circuit is incorporated and fixed, the integrated circuit is fixed to the plastic card. , A double-sided adhesive sheet is used to fix the printed wiring board to the outer panel.

In the above-mentioned IC card manufacturing process, a double-sided adhesive sheet having first and second release papers laminated on both sides of an adhesive layer is unwound from a roll and cut into a predetermined length to obtain a second release paper. The first release paper and the pressure-sensitive adhesive layer are cut out (half cut) in the shape of an IC card, and the half-cut portion of the first release paper and the pressure-sensitive adhesive layer are separated from the second release paper and attached to the integrated circuit. Then, the half-cut first release paper is peeled off, and the exposed adhesive layer is attached to a card or a wiring board. This double-sided pressure-sensitive adhesive sheet can be obtained by applying a pressure-sensitive adhesive to a release-treated release paper surface and drying it, and then attaching the release-treated surface of another release paper to the pressure-sensitive adhesive layer surface.

Conventionally, as such a release paper, a paper base material such as kraft paper or high-quality paper is laminated with polyethylene or the like on one or both sides, and a silicone release layer is provided on the laminated surface, or a polyethylene terephthalate sheet. One having a silicone release layer provided on one side is used, but high quality paper is often used because it is suitable for half-cutting.

An adhesive tape with double-sided release paper, in which release paper is laminated on both sides of an adhesive layer, is disclosed in, for example, JP-A-7-97552.
No., published in Japanese Unexamined Patent Publication No. In this method, polyethylene is laminated on high-quality paper or the like, a first pressure-sensitive adhesive layer is formed on the first release paper having a corona discharge treatment on the laminated surface, and a tape base material is laminated on this. On the other hand, a method for producing a double-sided adhesive tape by forming a second pressure-sensitive adhesive layer on a second release paper similar to the first release paper and bonding the second pressure-sensitive adhesive layer to the other surface of the tape base material. Is.

[0006]

According to the conventional double-sided pressure-sensitive adhesive tape and the double-sided pressure-sensitive adhesive tape obtained by the method described in the above publication, a high-quality paper or the like is used as a release sheet to be laminated on both sides of the pressure-sensitive adhesive layer as a base sheet. Since the release paper is wound outside, it does not have elasticity. When a double-sided adhesive tape using this is used as a roll body, the release paper on both sides has the same elongation, so the inner release paper is compressed in the circumferential direction due to the circumferential difference between the inside and the outside of the double-sided adhesive tape. Power acts. When this is fed out for the next processing, a release (tunnel) occurs in the release paper located inside. In such a double-sided pressure-sensitive adhesive tape, the raised portion becomes defective in the half-cutting process.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above conventional problems and to provide a double-sided pressure-sensitive adhesive sheet having excellent workability, in which the release paper does not float even when it is rolled out as a wound body. .

[0008]

A double-sided pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet with double-sided release paper, wherein release paper is laminated on both sides of a pressure-sensitive adhesive layer to form a roll, and at least the side wound as the outside of the roll. The release paper is a non-woven fabric in which the amount of fibers arranged in the longitudinal direction and the width direction is 1: 1 to 1: 8.

In the present invention, when the double-sided pressure-sensitive adhesive sheet is wound as a rolled body, at least the release paper on the outside is a nonwoven fabric base material. The release paper used is one in which a resin such as polyethylene is laminated on a non-woven fabric made of ordinary fibers, and the laminated surface is subjected to a release treatment with silicone or the like. The thinner the laminate, the better the half-cut suitability. However, if the thickness is less than 10 μm, peeling failure occurs due to the protrusion of threads of the nonwoven fabric, and if it exceeds 50 μm, the half-cut suitability deteriorates.
Therefore, the thickness of the laminate is preferably 10 to 50 μm.

The nonwoven fabric itself may be impregnated with a thermoplastic resin for binding the fibers together. Generally, the fibers that make up a non-woven fabric are layered so that there is no directionality,
Although the intersections of the fibers are bound by a binder resin, the nonwoven fabric of the present invention has a different ratio of the amount of fibers arranged in the longitudinal direction, that is, the direction in which the fibers are wound as a wound body, and the width direction. .

That is, the ratio of the amount of fibers in the longitudinal direction to the width direction is in the range of 1: 1 to 1: 8. The fiber composition of the non-woven fabric is ambiguous in the distinction between the longitudinal direction and the width direction, but here, it is distinguished between the fiber portion that is inclined approximately in the longitudinal direction and the fiber portion that is inclined approximately in the width direction. It shall be expressed as a ratio.

If the ratio of the amount of fibers in the lengthwise direction to the widthwise direction is less than 1 in the widthwise direction compared to 1 in the widthwise direction, the strength of the non-woven fabric is lowered, which causes troubles in the production of release paper.
If the fiber ratio in the width direction exceeds 8, the elongation in the longitudinal direction of the nonwoven fabric becomes abnormally large, and the nonwoven fabric shrinks due to stress relaxation after the release paper is manufactured.

The pressure-sensitive adhesive is not particularly limited, but conventionally used acrylic pressure-sensitive adhesives are suitable in terms of stability of pressure-sensitive adhesive properties and the like. The adhesive can be provided by coating and drying on the laminated surface of the non-woven fabric, but an adhesive layer separately applied and dried on the process paper is attached to the laminated surface of the non-woven fabric, and the process paper is peeled off to form the adhesive. The layer may be transferred to a non-woven fabric, and another release paper may be attached to the pressure-sensitive adhesive layer surface to form a double-sided pressure-sensitive adhesive sheet.

(Function) At least the release paper on the side wound on the wound body as the outer side is a non-woven fabric in which the arrangement amount of fibers in the longitudinal direction and the width direction is 1: 1 to 1: 8.
When the double-sided pressure-sensitive adhesive sheet is used as a roll body with the release paper as the outside, the release paper of the non-woven fabric substrate located outside is stretched due to the circumferential difference, and the inner release paper does not have a contracting force in the circumferential direction. As a result, even if the double-sided pressure-sensitive adhesive sheet is drawn out to be in a flat plate state, the release paper does not float.

[0015]

Embodiments of the double-sided pressure-sensitive adhesive sheet of the present invention will now be described with reference to the drawings. (Example 1) FIG. 1 is a partially enlarged cross-sectional view showing an example of the double-sided pressure-sensitive adhesive sheet of the present invention, in which an acrylic pressure-sensitive adhesive is applied to a release treated surface 5 of a silicone-treated polyester film (thickness 25 μm) 6. A release paper 1 in which a layer 4 is formed with a solid content of 50 g / m ² and the nonwoven fabric 1 is used as a base material in the pressure-sensitive adhesive layer 4.
The peeling-treated surface 3 of 0 is bonded. The non-woven fabric-based release paper 10 is made of a polyester fiber having a yarn diameter of 2.0 μm and a fold-type press applied to one side of a non-woven fabric 1 of 15 g / m ^{2 on} which polyethylene is laminated with a thickness of 20 μm. The thermosetting silicone is coated so that the release treated surface 5 has a solid content of 0.5 g / m ² . The double-sided pressure-sensitive adhesive sheet is wound up with the release paper 10 of the non-woven fabric base material as the outer side to form a rolled body 7.

(Example 2) Instead of a polyester film, polyethylene was laminated on one side of wood free paper,
The same double-sided pressure-sensitive adhesive sheet as in Example 1 except that a silicone-releasing release paper was used on the laminated surface, and the double-sided pressure-sensitive adhesive sheet was wound in a roll shape with the release paper of the non-woven fabric substrate as the outside. It was a heavy body.

Example 3 The same release paper as used in Example 1 was coated with 50 g / m ² of acrylic adhesive on the release treated surface.
A double-sided pressure-sensitive adhesive sheet obtained by applying (solid content) and laminating a release-treated surface of a release paper of the same non-woven fabric base material to the pressure-sensitive adhesive layer surface. And

(Comparative Example 1) An acrylic pressure-sensitive adhesive was applied and dried on a release-treated surface of a silicone-treated polyester film (thickness: 25 μm) to a solid content of 50 g / m ² to form a pressure-sensitive adhesive layer. A double-sided pressure-sensitive adhesive sheet obtained by sticking the same release-treated surface of the polyester film to the pressure-sensitive adhesive layer was wound up to obtain a wound body.

(Comparative Example 2) Comparative Example 1 except that as one release paper, polyethylene-laminated one side of high quality paper and silicone treated release paper was used on the laminated surface was used.
The same double-sided pressure-sensitive adhesive sheet as described in 1. above was wound in a roll shape with the release paper of the high-quality paper base material as the outside to form a roll.

Performance Evaluation With respect to the double-sided pressure-sensitive adhesive sheets of Examples 1 to 3 and Comparative Examples 1 and 2 described above, the floating state of release paper when unfolded from the roll was observed. Table 1 shows the results.

[0021]

[Table 1]

As is clear from Table 1, in all of the examples, the release paper did not float at all, but in the comparative example, a large number of lifts occurred.

[0023]

EFFECT OF THE INVENTION The double-sided pressure-sensitive adhesive sheet of the present invention has the above constitution, and at least the release paper on the side wound as the outer side of the roll has a fiber arrangement amount of 1: 1 in the longitudinal direction and the width direction.
Since it is a non-woven fabric having a ratio of ˜1: 8, the release paper does not float even when the double-sided pressure-sensitive adhesive sheet is used as a roll and the double-sided pressure-sensitive adhesive sheet is unwound from the roll. Therefore, it is possible to manufacture a high-quality product without hindrance to the next processing.

[0024]

[Brief description of the drawings]

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

[Explanation of symbols]

 1: Nonwoven fabric 2: Laminate layer 3, 5: Release treated surface 4: Adhesive layer 6: Polyester film 7: Rolled body 10: Release paper

Claims (1)

[Claims] 1. In a pressure-sensitive adhesive sheet with double-sided release paper, wherein release paper is laminated on both sides of a pressure-sensitive adhesive layer to form a roll, at least the release paper on the outer side of the roll is wound in the longitudinal direction and the width direction. The amount of fibers arranged is 1: 1 to 1: 8
A double-sided pressure-sensitive adhesive sheet, which is a non-woven fabric made from