JP2001131500A - Double coated adhesive tape for abrasive cloth fixing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double coated adhesive tape for abrasive cloth fixing which causes no float due to resiliency of a separator when the tape is fitted on a fixed plate, even if a wound article in a state of a separator mounted on one side of the tape and abrasive cloth mounted on the other side thereof is sent. SOLUTION: The both adhesive faces of the double coated adhesive tape for abrasive cloth fixing are protected using a separator, and the separator mounted on the fixed plate on the side of the adhesive face is made from polyethylene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a double-sided adhesive tape for fixing a polishing cloth.

[0002]

2. Description of the Related Art Conventionally, as a method of polishing a lens, glass, an aluminum disk, a wafer, etc., an abrasive made of a hard urethane foam or a synthetic leather having fine pores has been used.
2. Description of the Related Art A method of polishing using a polishing cloth attached to a surface plate of a polishing machine with a double-sided adhesive tape has been used. Further, the material to be polished may be fixed using a double-sided adhesive tape.

[0003] The performance required of a double-sided pressure-sensitive adhesive tape for fixing a polishing cloth is as follows. During polishing, the polishing material, the material to be polished and the surface plate are firmly adhered to each other, and the polishing is performed in the presence of an acidic or alkaline polishing liquid. Does not peel off due to heat or pressure, and can be peeled off from the surface plate after polishing. For this reason, for example, JP-A-63-241086 discloses a polishing adhesive tape employing a hard-to-cut special film as a base material of a double-sided adhesive tape, and JP-A-6-172721 discloses a device for firmly adhering. A double-sided pressure-sensitive adhesive tape or sheet made of a pressure-sensitive adhesive which extremely lowers the adhesive force at high temperatures has been proposed in Japanese Patent Laid-Open Publication No. Sho 61-23673.

In recent years, some polishing cloths have become larger (circles having a diameter of 1.5 m or more, rectangles having a size of 0.8 m × 2.5 m, and the like). The performance required for the double-sided pressure-sensitive adhesive tape is further added, and it is becoming an important required performance that the floating does not occur due to the separator. In this industry, usually, a polishing cloth and a double-sided adhesive tape are bonded and then conveyed, and a polishing maker removes a separator and mounts the separator on a surface plate.

However, in order to transport a gigantic polishing cloth tape, it must be wound in a roll shape. For this reason, when the wound material is mounted on a platen, it is necessary to rewind and temporarily flatten the tape. Although it is necessary, in the conventionally used separator, the stiffness is strong and floating occurs due to the repulsive force, tunneling occurs between the adhesive and the separator, the adhesive surface is roughened due to this, and if used as it is, it will be uniform There is a problem that it hinders a smooth polishing operation.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and is shipped as a roll in a state where a separator is attached to one side of a double-sided adhesive tape and an abrasive cloth is attached to the other side. In particular, it is an object of the present invention to provide a double-sided adhesive tape for fixing a polishing cloth, which does not float due to the repulsive force of a separator when mounted on a surface plate.

[0007]

The double-sided pressure-sensitive adhesive tape for fixing a polishing cloth of the present invention is a double-sided pressure-sensitive adhesive tape for fixing an abrasive to a surface plate of a polishing machine. The separator on the side is made of polyethylene.

In the double-sided pressure-sensitive adhesive tape for fixing the polishing cloth, a pressure-sensitive adhesive layer (hereinafter, referred to as a primary-surface pressure-sensitive adhesive layer) is provided on one surface of the base material layer, and the other surface is provided on the other surface. The one provided with a pressure-sensitive adhesive layer (hereinafter referred to as a secondary surface pressure-sensitive adhesive layer) for attaching an abrasive made of a hard urethane foam or a synthetic leather having fine pores is used.
For the primary surface pressure-sensitive adhesive layer, a removable rubber-based or acrylic pressure-sensitive adhesive is used, and for the secondary surface pressure-sensitive adhesive layer, a rubber-based or acrylic-based pressure-sensitive adhesive that easily adheres to an abrasive is used.

The base material layer may be, for example, a soft vinyl chloride resin film, polyethylene terephthalate (PET)
A thermoplastic resin film such as a film and a polyurethane film is used. Among them, a PET film having a thickness of about 25 μm is preferable. The base material layer may be subjected to a corona treatment in order to improve the adhesiveness with the pressure-sensitive adhesive layer.

A polyethylene film is used as a separator for protecting the pressure-sensitive adhesive layer on the pressure-sensitive adhesive surface (primary pressure-sensitive surface) on the side attached to the surface plate. As the polyethylene, a low-density polyethylene having more flexibility than a high-density polyethylene is preferable. The thickness of the separator is preferably 100 μm or more from the viewpoint of workability at the time of peeling by hand.
Since the floating at the time of rewinding becomes large, it is preferably 300 μm or less.

On the other hand, a separator made of a urethane resin film or a biaxially oriented polypropylene (OPP) film adheres to the pressure-sensitive adhesive layer to make it difficult for the separator to peel off. Is difficult to use because of its poor adhesion and cost.

There is no particular limitation on the separator used for the adhesive surface (secondary adhesive surface) for attaching the other abrasive.

The above-mentioned pressure-sensitive adhesive layer can be formed, for example, by a direct coating method in which a pressure-sensitive adhesive is directly applied to a substrate layer; It can be formed by a method or the like.

[0014]

Embodiments of the present invention will be described below. (Example) A 23 μm-thick PET film (“FE # 2002” manufactured by Nimura Chemical Co., a double-sided corona treatment) as a base material layer
On one side, an acrylic pressure-sensitive adhesive (“SK-1501B” manufactured by Soken Chemical Co., 30% by weight solid content) as a primary surface pressure-sensitive adhesive and a curing agent (“Coronate L-4” manufactured by Nippon Polyurethane KK)
5 ", solid content: 45% by weight).
The mixture is dried so as to have a thickness of 50 μm after drying, and an acrylic adhesive (“WHD glue” manufactured by Sekisui Chemical Co., Ltd., solid content 40% by weight) and a curing agent are applied to the other surface as a secondary surface adhesive. (Nippon Polyurethane Co., Ltd. "Coronate L-55
E ", solid content 55% by weight).
The mixture was applied and dried so that the thickness after drying was 50 μm. Next, a polyethylene sheet (“Polylon TP- manufactured by Sekisui Film Nishi Nihon Co., Ltd.) was used as a separator for the primary surface adhesive.
W ", thickness 100 µm) to obtain a double-sided adhesive tape for fixing a polishing cloth.

After the double-sided pressure-sensitive adhesive tape for fixing the polishing cloth is cut into A4 size, a film surface of a polishing cloth (“H7000SPH” manufactured by Fuji Boseki Co., Ltd.) is applied to the secondary pressure-sensitive adhesive layer. I combined. Next, the polishing pad was rolled so that the polishing cloth side became the surface, and the rubber band was stopped. The rubber band was left to stand for one day, the rubber band was removed, and the plate was left naturally on a flat plate with the separator facing upward. After standing for 3 days under the above conditions, the presence or absence of floating of the separator was visually observed. When the above evaluation was performed with the number of samples n = 5,
All five samples were in a flat state, and none of the samples had floating.

(Comparative Example) A paper separator ("WHW-80 White" manufactured by San-A Kaken Co., Ltd., having a thickness of 13) used for an ordinary double-sided pressure-sensitive adhesive tape was used as a separator for the primary-side pressure-sensitive adhesive layer.
0 μm), except that a double-sided pressure-sensitive adhesive tape for fixing a polishing cloth was obtained in the same manner as in Example 1. The double-sided pressure-sensitive adhesive tape for fixing the polishing cloth was visually observed for the presence or absence of floating of the separator in the same manner as in Example 1, and the occurrence of floating was observed in all five samples.

[0017]

The double-sided pressure-sensitive adhesive tape for fixing a polishing cloth of the present invention has the above-mentioned structure, and is wound in a state in which a separator is attached to a primary-side pressure-sensitive adhesive layer and a polishing cloth is adhered to a secondary-side pressure-sensitive adhesive layer. Even if it is shipped as a batch, no lifting will occur due to the repulsive force of the separator in the rewinding work when mounting on a surface plate.

Claims (1)

[Claims] 1. A double-sided pressure-sensitive adhesive tape for fixing an abrasive to a surface plate of a polishing machine, wherein the separator on the side of the adhesive surface attached to the surface plate is made of polyethylene. Double-sided adhesive tape.