JPH07328932A - Abrasive tape and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide an abrasive tape preventing the fine abrasive chips produced during the polishing work from causing trash abrasion between the abrasive tape and a polished body, capable of applying high-quality polishing with high efficiency, and easy to manufacture. CONSTITUTION:This abrasive tape has an abrasive layer made of a resin layer dispersed with abrasive grains in a binder resin. The abrasive layer is constituted of the wholly solid first abrasive layer and the discontinuous second abrasive layer formed on the first abrasive layer, and a coating agent dispersed with abrasive grains in the binder resin is applied to form the wholly solid first abrasive layer and the discontinuous second abrasive layer respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing tape mainly used for finishing polishing magnetic media such as floppy disks, hard disks, magnetic tapes, etc., and cleaning magnetic heads, metal rolls, resin rolls and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Surfaces of magnetic heads, metal parts, magnetic media, etc. used for precision electronic parts and precision machine parts are
It is required to be finished to a precision surface of micron or submicron order or less.

As a polishing tape used for performing these precision surface finishes, or as a cleaning tape for removing dusts and foreign substances on the surfaces of the components which are precision surface finishes, synthetic paper, plastic film, etc. A polishing tape including a base material for a polishing tape formed of a flexible film and a polishing layer formed of a resin layer in which abrasive grains are dispersed in a binder resin is used.

A conventional polishing tape has a thickness 1 obtained by dispersing abrasive grains in a binder resin with respect to a polishing tape substrate made of a flexible film such as a plastic film or synthetic paper.
Since the polishing layer having a thickness of 0 to 20 μ was formed on the entire surface, polishing debris generated during the polishing operation adheres to the surface of the polishing tape and the surface of the object to be polished, and the polishing debris forms between the polishing tape and the object to be polished. Since scratches were caused between them, streak-like scratches were often generated on the polished surface.

To prevent this, measures have been taken such as containing an antistatic agent in the polishing layer or sucking polishing debris under reduced pressure during the polishing work to remove it outside the process.
However, none of them had sufficient effects, and the process management was complicated.

Therefore, a polishing tape having a polishing layer having a concave portion on the surface thereof has been proposed so as to collect the polishing dust generated during the polishing operation (Japanese Patent Laid-Open No. 255069/1987). -83172 publication).

[0007]

By the way, the polishing tape described in Japanese Patent Laid-Open No. 62-255069 described above is used for forming a coating layer with a coating agent containing a large amount of an inorganic component. In the coating layer drying step, the unevenness of the Benard cells due to the "convection cell phenomenon" occurring in the coating layer is caused to appear in the polishing layer,
The shape of the recesses to be formed is limited to that of a substantially hexagonal plane, and it is difficult to form recesses with a uniform pattern, and it is not possible to form recesses with a pattern as designed in the polishing layer. .

Further, the polishing tape described in Japanese Patent Laid-Open No. 2-83172 has a drawback that the production efficiency of the polishing tape is poor.

Further, these polishing tapes have drawbacks such that high quality polishing cannot be performed with high efficiency.

On the other hand, according to the present invention, minute polishing dust generated during polishing work does not cause contaminating wear between the polishing tape and the object to be polished, and high quality polishing can be performed with high efficiency. (EN) Provided are a polishing tape having the features that it can be manufactured and is easy to manufacture, and a manufacturing method thereof.

[0011]

According to the present invention, the polishing layer formed on the surface of the base material for the polishing tape is a solid first surface.
And a discontinuous second polishing layer formed on the first polishing layer.

The present invention also comprises a polishing tape having a width between the discontinuous second polishing layers of 0.3 to 3.0 mm.

Furthermore, the present invention comprises a polishing tape having at least one discontinuous second polishing layer for every 10 mm in the running direction of the polishing tape.

Further, according to the present invention, a first polishing layer is formed by applying a coating agent, in which abrasive grains are dispersed in a binder resin, to a polishing tape substrate to form a solid first surface, and then the first polishing layer is formed. It comprises a method for producing a polishing tape, in which a second polishing layer is formed by discontinuously applying a coating agent in which abrasive grains are dispersed in a binder resin onto the polishing layer.

In the polishing tape of the present invention having the above-mentioned structure, the polishing tape base material has mechanical strength, dimensional stability,
Synthetic paper and plastic films with excellent properties such as heat resistance, such as polyethylene terephthalate,
Plastic films such as polypropylene, polycarbonate, di-acetate acetate, tri-acetate acetate, polyethylene, polybutylene terephthalate and polyarylate are used.

The polishing layer is composed of a resin layer in which abrasive grains are dispersed in a binder resin. The first polishing layer has a solid surface and the second discontinuous second layer is formed on the first polishing layer. And a polishing layer.

The polishing layer is composed of abrasive particles made of a high hardness inorganic fine powder in a binder resin liquid, for example, particles of aluminum oxide, silicon carbide, chromium oxide, zirconium oxide, diamond, iron oxide, boron nitride, emery or the like. It is formed by applying a coating agent in which abrasive grains having a diameter of about 0.1 to 60 μm are dispersed, and each of the first polishing layer and the second polishing layer has a thickness of 3 to 100 g (dr.
y) / m ² is formed.

As the binder resin for the polishing layer, polyester, vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinylidene chloride copolymer, acrylic ester copolymer, methacrylic ester copolymer, urethane resin, etc. may be used. Thermosetting resins such as thermoplastic resins, phenolic resins, epoxy resins, urethane curable resins, melamine resins, etc., and reactive resins prepared by mixing the above-mentioned thermoplastic resins with a bridging binder such as an epoxy compound or an isocyanate compound. Further, a resin or the like which is polymerized and crosslinked by radiation is used.

Incidentally, toluylene diisocyanate (TDI), xylylene diisocyanate (XDI), and hexamethylesylisocyanate are added to the functional groups (--OH, --NH ₂ , --COOH, etc.) in the binder resin described above. A polishing layer in which an isocyanate-based curing agent such as (HMDI) is mixed to an extent that the equivalent ratio represented by [isocyanate group (-NCO) / functional group of resin] is in the range of about 0.5 to 10 By using a coating agent for formation, a polishing layer composed of a thermosetting resin layer formed by a reaction between a functional group in a binder resin and a curing agent, the polishing layer exhibiting extremely excellent wear resistance and heat resistance. Is obtained.

In the coating agent for forming the polishing layer, if the amount of the abrasive particles is less than 100 parts by weight with respect to 100 parts by weight of the binder resin, there is a possibility that a polishing layer having a good polishing action cannot be obtained. Resin for binder 1
When the abrasive grains exceed 1400 parts by weight with respect to 00 parts by weight,
The binder strength of the binder component in the polishing layer is insufficient, and the abrasive grains may fall off during the polishing operation with the polishing tape.

Therefore, it is preferable to form the polishing layer by using a coating agent containing 100 to 1400 parts by weight of abrasive grains with respect to 100 parts by weight of the binder resin.

After the coating and drying of the coating agent for forming the polishing layer, it goes without saying that post-treatments such as heating and irradiation are applied depending on the kind of the binder resin in the coating agent.

[0023]

EXAMPLES The concrete structures of the polishing tape and the method for producing the same according to the present invention will be described below based on examples.

Example 1 (1) Preparation of coating agent for forming first polishing layer Linear saturated polyester resin [Toyobo Co., Ltd .: Byron
^# 530] 40 parts by weight, toluene 70 parts by weight, and methyl ethyl ketone 20 parts by weight in a resin solution, aluminum oxide fine powder [Showa Denko KK: WA ^# 4000] 200
After adding 1 part by weight and dispersing well with a sand mill, xylylene diisocyanate [The Inktech]
Co., Ltd .: XEL curing agent (D)] 10 parts by weight, followed by diluting it with an equal amount of a mixed solvent of toluene and methyl ethyl ketone to form a coating agent for forming a first polishing layer having a viscosity of 100 cps. Obtained [a].

(2) Preparation of coating agent for forming second polishing layer Linear saturated polyester resin [Toyobo Co., Ltd .: Byron
^# 240] To a resin solution of 60 parts by weight, 70 parts by weight of toluene and 70 parts by weight of methyl ethyl ketone, 200 parts by weight of silicon carbide fine powder [Showa Denko KK: GC ^# 8000] is added and well dispersed by a sand mill. And then xylylene diisocyanate [The Inktech Co., Ltd .: XE
L curing agent (D)] 10 parts by weight, followed by diluting it with an equal amount mixed solvent of toluene and methyl ethyl ketone to obtain a coating agent [b] having a viscosity of 80 cps for forming a second polishing layer. Obtained.

(3) Manufacture of polishing tape A coating agent for forming the above-mentioned first polishing layer is formed on one surface of a polishing tape base material made of a polyethylene terephthalate film [Teijin KK: low heat shrink SG type] having a thickness of 50 μm. [A] is 50 g (dry) /
The first polishing layer was formed by applying a solid coating on the entire surface of m ² and then drying and further performing aging treatment for 2 days in an atmosphere of 50 ° C.

Subsequently, the coating agent [b] for forming the second polishing layer is gravure-printed on the first polishing layer by a gravure printing method to form a striped pattern of 50 g (dry) / m ² at the coated portion. Then, it was dried and further subjected to an aging treatment in an atmosphere of 50 ° C. for 5 days to form a second polishing layer to obtain a polishing tape as an example product of the present invention.

The width between the striped polishing layers of the second polishing layer is about 1.0 mm, and the striped width of the striped second polishing layer is about 2.0 mm. .

[0029]

The polishing tape of the present invention has the first solid surface.
Since the polishing is performed by the polishing layer and the discontinuous second polishing layer formed on the first polishing layer, efficient polishing can be performed.

In the polishing tape of the present invention, the first
The recesses between the discontinuous second polishing layers formed on the second polishing layer have a function of capturing minute polishing dust generated during the polishing operation, and therefore are generated during the polishing operation. It is possible to perform high-quality polishing without causing minute abrasion dust to cause contaminating wear between the polishing tape and the object to be polished.

Further, in the polishing tape of the present invention, since the first polishing layer also functions as a cushion layer, there is no unevenness of polishing due to insufficient pressure or excessive pressure during polishing work, and high quality polishing is also possible in this respect. Can be done.

Furthermore, the method for producing the polishing tape of the present invention is
Since the polishing layer is formed by applying the coating agent in which the abrasive particles are dispersed in the binder resin, it is easy to adjust the distance between the discontinuous second polishing layers, and it is efficient and accurate. The polishing tape of the present invention is obtained.

Furthermore, by reducing the coating amount of the coating agent at the time of forming the second polishing layer to reduce the thickness of the layer, the gap between the first polishing layer and the second polishing layer is reduced. By reducing the step difference and combining different particle diameters of the abrasive grains in the first polishing layer and the second polishing layer, a polishing tape having delicate control of polishing ability can be obtained.

Claims (4)

[Claims] 1. A polishing tape comprising a polishing tape substrate and a polishing layer comprising a resin layer in which abrasive grains are dispersed in a binder resin, wherein the polishing layer is a first polishing layer having a solid surface, A polishing tape comprising a discontinuous second polishing layer formed on a first polishing layer. 2. The polishing tape according to claim 1, wherein the width between the discontinuous second polishing layers is 0.3 to 3.0 mm. 3. The polishing tape according to claim 1 or 2, wherein at least one discontinuous second polishing layer is present with respect to 10 mm in the running direction of the polishing tape. . 4. A first polishing layer is formed on a polishing tape base material by applying a coating agent, in which abrasive grains are dispersed in a binder resin, on the entire surface to form a first polishing layer, and then the first polishing layer is formed. A method for producing a polishing tape, wherein the second polishing layer is formed by discontinuously applying a coating agent in which abrasive particles are dispersed in a binder resin to the above.