JPH06346032A - Double-side tacky tape - Google Patents

Abstract

PURPOSE:To obtain double-side tacky tape capable of exhibiting excellent adhe sion also to adherend having both rough face and curved face and free from interfacial release between a substrate and an adhesive layer. CONSTITUTION:This double-side tacky tape is obtained by providing acrylic tacky agent layers 12 and 23 (manufactured by Soken Chemical & Engineering Co., Ltd. and having trade name of 'SK Dyne 1717') having 50mum thickness on both faces of polyurethane film 11 (manufactured by Nihon Matai Co., Ltd. and having trade name of 'Esmar USR') having 50mum thickness and mold release paper 14 whose both side is subjected to mold release treatment and is laminated to the face of the tacky agent layer 13.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a double-sided adhesive tape based on a polyurethane film.

[0002]

2. Description of the Related Art Conventionally, a double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer provided on both surfaces of various base materials has been used according to the use and purpose. For example, non-woven fabrics, stretched polypropylene, polyester, films such as vinyl chloride, acrylic foams and the like are known as base materials (published by the Japan Adhesive Tape Industry Association: "Adhesive Handbook").

The double-sided pressure-sensitive adhesive tape is required to have adhesiveness when the adherend surface is a rough surface and conformability to the surface shape when the adherend surface is a curved surface, depending on the place of use. A base material mainly composed of a synthetic resin foam is used for the former, and a synthetic resin film such as a nonwoven fabric, stretched polypropylene, polyester or the like is used for the latter.

[0004]

Since the one using the base material mainly composed of the synthetic resin foam has a large thickness, the base material is wrinkled when attached to an adherend having a curved surface. Or, it may come off the adherend. Further, in a case where a thin synthetic resin film is used as a base material, there is a problem that it does not fit to an adherend having a rough surface because it has no cushioning property.

It is also conceivable that both the rough surface adhesiveness and the curved surface followability can be achieved by using a soft vinyl chloride resin sheet as the base material. However, the plasticizer compounded in the vinyl chloride resin is used as the base material. There is a problem in that bleeding on the surface reduces the adhesive strength, causing interfacial peeling between the substrate and the adhesive layer.

The present invention solves the above-mentioned problems of the prior art, exhibits excellent adhesiveness even to an adherend having a rough surface and a curved surface, and does not cause interfacial peeling between the base material and the pressure-sensitive adhesive layer. Intended to provide tape.

[0007]

MEANS FOR SOLVING THE PROBLEMS The double-sided pressure-sensitive adhesive tape of the present invention has an elongation of 300 to 600% and a thickness of 30 to 200 μm.
And a pressure-sensitive adhesive layer provided on both surfaces of the base material.

The polyurethane used in the present invention is a polymer copolymer obtained by a polyaddition reaction of an isocyanate and a polyol. As the isocyanate component,
Polyisocyanates such as mono- or multi-aromatic rings, aliphatic and aliphatic diisocyanates, triisocyanates and tetraisocyanates, or mixtures thereof are used.
As the polyhydroxyl compound, polyester polyol, polyether polyol and the like are used.

As the base material of the pressure-sensitive adhesive tape used in the present invention, since flexibility and cushioning property are particularly required, hydrogenated 4-4'-diphenylmethane diisocyanate is most suitable as the isocyanate, and hexamethylene. Diisocyanates can also be used. Examples of the polyester of the polyol include ethyl acrylate, butyl acrylate, and copolymers thereof.
Those having a molecular weight of are preferred.

The polyurethane film can be formed into various thicknesses by extrusion molding, inflation molding, urethane solution casting, or the like. The thickness of the polyurethane film used in the present invention is 30 to 200 μ.
The range is m, preferably 50 to 150 μm.
If the thickness is less than 30 μm, the cushioning property of polyurethane is insufficient and the adhesion to rough surfaces deteriorates.
If it exceeds 200 μm, the followability to a curved surface becomes poor.

Further, the elongation of the polyurethane film is 300.
If it is less than 60% or more than 600%, the cushioning property is insufficient even with the above thickness, the adhesiveness to a rough surface becomes poor, and the followability to a curved surface becomes poor.

The pressure-sensitive adhesive layer used in the present invention is not particularly limited, and may be an acrylic type, a rubber type, or
Urethane-based or styrene-based adhesives are used. The pressure-sensitive adhesive layer preferably has a thickness of 20 to 100 μm, more preferably 30 to 70 μm. The formation of the pressure-sensitive adhesive layer includes a method of directly applying the pressure-sensitive adhesive layer to the base material, a transfer method in which the pressure-sensitive adhesive layer is once formed on the release sheet, and the base material is attached thereto.
The above-mentioned double-sided pressure-sensitive adhesive tape has a release paper laminated on at least one side to form a wound body.

[0013]

The double-sided pressure-sensitive adhesive tape of the present invention, which uses a polyurethane film as a base material, has cushioning properties and exhibits good adhesiveness to an adherend having a rough surface. Further, the polyurethane film is highly flexible and therefore adheres well to the adherend having a curved surface. Furthermore, since the polyurethane film contains no plasticizer, bleeding of the plasticizer does not cause interfacial peeling between the substrate and the pressure-sensitive adhesive layer.

[0014]

EXAMPLES Next, examples of the double-sided adhesive tape of the present invention will be described. (Example 1) FIG. 1 is a sectional view showing an example of the double-sided pressure-sensitive adhesive tape of the present invention. The double-sided adhesive tape 1 is a polyurethane film 11 (made by Nippon Matai Co., Ltd., product name: 50 μm in thickness).
50 μm thick acrylic pressure-sensitive adhesive layers 12 and 13 on both sides of Esmer USR (trade name: manufactured by Soken Chemical Co., Ltd .:
SK dynes 1717) are provided, and release paper 14 subjected to release treatment on both sides is attached to the surface of the adhesive layer 13.

The pressure-sensitive adhesive layers 12 and 13 are formed by applying the above-mentioned pressure-sensitive adhesive to the release paper 14 and drying it, and then sticking a polyurethane film to the release paper 14 to form a roll with the pressure-sensitive adhesive layer 12 inside. is there.

(Example 2) A double-sided pressure-sensitive adhesive tape similar to Example 1 except that a polyurethane film having a thickness of 150 μm (trade name: Rack Skin, manufactured by Seiko Kasei Co., Ltd.) was used as a substrate.

(Comparative Example 1) As a base material, a stretched polypropylene film having a thickness of 30 μm (trade name: F manufactured by Nimura Chemical Co., Ltd.)
It is the same double-sided adhesive tape as in Example 1 except that OF) (OPP) was used.

(Comparative Example 2) A double-sided adhesive tape similar to that of Example 1 except that a polyethylene terephthalate film (trade name: FOF-2002, manufactured by Nimura Chemical Co., Ltd.) (PET) having a thickness of 23 μm was used as a substrate.

(Comparative Example 3) As a base material, a soft vinyl chloride film having a thickness of 50 μm, which is obtained by mixing 30 parts by weight of a plasticizer with 100 parts by weight of vinyl chloride resin (manufactured by Sanpo Resin Co., Ltd., trade name: TE-950). The double-sided pressure-sensitive adhesive tape was the same as in Example 1 except that (PVC) was used.

Comparative Example 4 A foamed sheet of polyethylene resin having a thickness of 2 mm as a base material (trade name of Sekisui Chemical Co., Ltd .:
The same double-sided adhesive tape as in Example 1 except that Softlon 3002 and foaming ratio 30 times) were used.

(Comparative Example 5) A foamed sheet of a polyurethane resin having a thickness of 2 mm as a base material (trade name: manufactured by Nihon Ryogyo Co., Ltd.)
The double-sided pressure-sensitive adhesive tape was the same as in Example 1 except that Nipperon C) was used.

Examples 1 to 2 and Comparative Examples 1 to 5
For each of the double-sided pressure-sensitive adhesive tapes, the adhesiveness to a rough surface and the adhesiveness to a curved surface were examined and the adhesive strength was measured. The results are shown in Table 1.

[0023]

[Table 1]

Performance Evaluation (1) Adhesion to Rough Surface A steel plate having a smooth surface was vertically set as an adherend, and the double-sided adhesive tape was cut into a rectangle of 3 × 10 cm to remove the release paper from the test piece. It was attached to the above steel plate. Then, an acrylic resin plate having a depth of about 20 to 30 μm and having the same size as the test piece is superposed on the surface of the test piece and pressed by hand, and then at room temperature for 1 hour.
Leave for 5 minutes. Then, add 100 to the acrylic resin plate.
The weight of g was suspended and the peeling state of the acrylic resin plate was observed according to the following criteria. ◯: Neither the steel plate nor the acrylic resin plate was peeled off at all. X: The acrylic resin plate was immediately peeled off.

(2) Adhesion to curved surface A steel pipe having an outer diameter of 30 mm was wrapped with the same test piece as the long piece in the circumferential direction, and the presence or absence of wrinkles in the test piece was observed according to the following criteria. ◯: Wrinkles did not occur at all x: Wrinkles occurred

(3) Measurement of Adhesive Strength A polyester film on which the same test piece as described above is adhered is cut into a size of 15 mm × 100 mm, adhered to a smooth steel plate and lightly pressure-bonded at 60 ° C. After leaving for a week, the peeling force in the 180 ° direction was measured.

As is clear from Table 1, the double-sided pressure-sensitive adhesive tape whose base material is a polyurethane film has good adhesion to rough surfaces and adhesion to curved surfaces, and the adhesive strength does not decrease.
On the other hand, those of Comparative Examples 1 and 2 lacked the cushioning property of the base material and therefore lacked the adhesiveness to the rough surface, and those of Comparative Example 3 had a marked decrease in the adhesive force due to the plasticizer contained in the soft vinyl chloride film of the base material. is doing. Further, in Comparative Examples 4 and 5, since the thickness of the base material is large, the adhesion to the curved surface is not good.

[0028]

Since the double-sided pressure-sensitive adhesive tape of the present invention has the above-mentioned constitution and uses the polyurethane film as a base material, it exhibits good adhesiveness to an adherend having a rough surface. Further, since the polyurethane film is highly flexible, it adheres well to the adherend having a curved surface. Furthermore, since the polyurethane film does not contain a plasticizer, it does not cause interfacial peeling between the substrate and the pressure-sensitive adhesive layer due to bleeding of the plasticizer, does not reduce the adhesive strength, and can be applied to various adherends. .

[0029]

[Brief description of drawings]

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

[Explanation of symbols]

 1: Double-sided adhesive tape 11: Polyurethane film 12, 13: Adhesive layer 14: Release paper

Claims (1)

[Claims] 1. An elongation of 300 to 600% and a thickness of 30 to
A double-sided pressure-sensitive adhesive tape comprising a polyurethane film having a thickness of 200 μm as a base material, and an adhesive layer provided on both surfaces of the base material.