JPH0726214A - Self-adhesive tape - Google Patents

Abstract

PURPOSE:To obtain a self-adhesive tape which can be peeled off without breaking a polyolefin foam substrate sheet by thermally fusing a polyolefin film to the substrate sheet and forming a self-adhesive layer on the polyolefin film. CONSTITUTION:A self-adhesive layer is formed on a polyolefin film which has been thermally fused to a polyolefin foam substrate sheet. A single-coated self-adhesive tape is produced by thermally fusing the polyolefin film to one side of the substrate sheet, forming the self-adhesive layer on the film by transfer coating or coating, and drying the self-adhesive layer. A double-coated self-adhesive tape is produced by thermally fusing the film to both sides and forming the self-adhesive layer on both sides. A foam sheet with a thickness of 0.2mm to several mm and a foaming ratio of 3-30 is usually used. A pref. polyolefin film is a biaxially oriented polypropylene film with a thickness of 20-100mum.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an adhesive tape having a polyolefin foam sheet as a support.

[0002]

2. Description of the Related Art A pressure-sensitive adhesive tape having a synthetic resin foam sheet as a support has various polymer materials such as polyurethane and polyethylene as a support, and a pressure-sensitive adhesive layer directly transferred onto one or both sides of the support. It is formed by applying, and by utilizing the properties of the foam such as thickness, cushioning property, cushioning property, it is an adhesive tape with excellent creep resistance ("Adhesive Handbook").
Japan Adhesive Industry Association, March 2, 1985, p. 387). This foam adhesive tape has been used mainly for fixing various parts such as side moldings, emblem marks, and fillet protectors for automobiles.

[0003]

In recent years, as a part of environmental problems, there has been an increasing tendency to reuse plastics without discarding them. In order to collect plastics for vehicles as well, it has become necessary to peel off the foam adhesive tape used for fixing components as described above.

[0004] However, the foam adhesive tape generally has a high adhesive force due to its application, and when the tape is peeled off, the foam part is torn, and a part of the foam part adheres to the surface of the plastic part. It remains stuck, hindering reuse.

[0005] In many cases, a vinyl chloride resin film is stuck and reinforced on the foam sheet of the support, but such a foam adhesive tape has a vinyl chloride resin film when it is burned. Therefore, there is a problem that the hydrogen chloride gas generated damages the furnace, and it cannot be reused as an energy source by burning and using the heat to generate electricity.

The present invention has been made to solve the above problems.
An object of the present invention is to provide a pressure-sensitive adhesive tape that exhibits a high adhesive force when it is attached and that can be peeled off without being destroyed when it is peeled off and that can be reused.

[0007]

The present invention is a pressure-sensitive adhesive tape having a polyolefin foam sheet fused with a polyolefin film, and a pressure-sensitive adhesive layer formed on the film.

The present invention can be applied to a single-sided adhesive tape or a double-sided adhesive tape. In the case of a single-sided adhesive tape, a polyolefin film is fused and adhered to one surface of a polyolefin foam sheet. In the case of a double-sided pressure-sensitive adhesive tape, a film is attached to both surfaces of the foam sheet, and then a pressure-sensitive adhesive layer is formed on both surfaces of the foam sheet.

The thickness and the expansion ratio of the polyolefin foam sheet are appropriately determined according to the purpose of use, but normally, the thickness is about 0.2 to several mm and the expansion ratio is about 3 to 30 times. It

The polyolefin film attached to the polyolefin foam sheet reinforces the foam sheet, and biaxially stretched polypropylene film is particularly preferably used. Since the adhesive strength of the pressure-sensitive adhesive must be sufficiently endured, the thickness is preferably in the range of 20 to 100 μm. This polyolefin film is firmly attached to the foam sheet by heat fusion.

Conventionally, for manufacturing reasons, there is a foam pressure-sensitive adhesive tape obtained by sticking a double-sided pressure-sensitive adhesive tape of Japanese paper to a foam sheet. However, this is a layer crack at the portion of the Japanese paper when peeled off. And some of the fibers of the Japanese paper may remain on the adherend together with the adhesive, so that the object of the present invention cannot be achieved.

The pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive solution on release paper, drying the solution, and then bonding the solution on the polyolefin film, which is a so-called transfer method. When it is thin, it is formed by applying the pressure-sensitive adhesive solution directly on the reinforcing film and drying it. Further, release paper may be overlaid on the adhesive layer.

[0013]

In the adhesive tape of the present invention, when the adhesive tape is peeled off from the adherend, the polyolefin foam sheet is heat-fused with the polyolefin film of the same quality, so that both are firmly integrated and the foam is Since the sheet is detached from the adherend while being held by the polyolefin film, it can be peeled from the adherend without tearing, and the pressure-sensitive adhesive layer is also peeled together with the polyolefin film and is unlikely to remain on the surface of the adherend.

Further, in the support of the adhesive tape, since the olefin foam sheet of the support and the film for reinforcing the same are made of the same polyolefin, hydrogen chloride gas is not generated during combustion and the furnace is not damaged. .

[0015]

【Example】

Next, the adhesive tape of the present invention will be described with reference to examples. As a polyolefin foam sheet,
Polyethylene foam (IFJ200115, manufactured by Sekisui Chemical Co., Ltd.) having a thickness of 1.15 mm and a foaming ratio of 20 times is used, and a biaxially oriented polypropylene film (OPP # 60, manufactured by Toyobo Co., Ltd.) having a thickness of 60 μm is heated and melted on one side thereof. And the adhesive solution (SKDyne-17
17, manufactured by Soken Chemical Industry Co., Ltd.) is directly applied and dried to give about 50 μm.
An adhesive layer having a thickness of m was formed.

The pressure-sensitive adhesive tapes thus produced were attached to a polypropylene resin plate and an ABS resin plate, respectively, and peeled off after 30 days, and the polyolefin foam did not tear and adhered to any plate. No tape residue was left.

[0018]

As described above, the pressure-sensitive adhesive tape of the present invention, when used, is
Without damaging the characteristics of the foam adhesive tape such as cushioning
When it is no longer needed and can be peeled off from an adherend such as plastic, it can be peeled off without breaking the portion of the foam, which makes it extremely easy to reuse the plastic or the like of the adherend. .

In the peeled adhesive tape, the reinforcing film is made of polyolefin and does not contain vinyl chloride or the like which is a source of hydrogen chloride gas which may damage the furnace during combustion. There is also an advantage that can be reused.

Claims (1)

[Claims] 1. An adhesive tape comprising a polyolefin foam sheet and a polyolefin film which are heat-sealed together to form an adhesive layer on the film.