JPH06278042A - Abrasive material - Google Patents

Abstract

PURPOSE:To provide an abrasive material which enables an efficient polishing operation without the need for replacing the abrasive material even when a subject to be polished undergoes several steps of polishing processes or when areas of the subject to be polished undergo polishing finish to different accuracies. CONSTITUTION:An abrasive material 1 comprises abrasive layers 3a, 3b, 3c formed in plural areas, the abrasive layers in adjacent areas different at least in either the kind or grain size of abrasive material from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abrasive material used for polishing magnetic recording media such as floppy disks, video tapes, hard disks and optical disks, magnetic heads and stampers for optical disks.

[0002]

2. Description of the Related Art Abrasive materials used for surface finishing and precision finishing of magnetic recording media are, for example, flexible base materials for abrasive materials such as polyester films and polishing materials formed on the base materials for abrasive materials. The polishing layer is formed as a coating layer of a coating agent in which abrasive particles made of inorganic fine powder having high hardness are dispersed in a resin solution for a binder.

[0003]

In the above-mentioned conventional polishing work using an abrasive, polishing of a magnetic head, a stamper of an optical disk, etc. is usually carried out in several steps including rough polishing, intermediate finish polishing and finish polishing. Has been carried out. Further, for example, a magnetic recording medium such as a floppy disk, a video tape, a hard disk, and an optical disk is subjected to polishing finish with different accuracy for each area.

Each of these polishing operations is carried out by utilizing a plurality of types of abrasives having different abrasive particles, and it is troublesome to replace the abrasives a plurality of times during the polishing operation. is there.

On the other hand, the present invention, for example, when performing several steps of polishing steps such as rough cutting polishing, intermediate finishing polishing, and finishing polishing, or when performing polishing finishing with different precision for each region of the object to be polished. Moreover, it is an object of the present invention to provide an abrasive material that does not require replacement of the abrasive material and can efficiently perform the polishing operation.

[0006]

The abrasive of the present invention comprises an abrasive base material and an abrasive layer formed on the abrasive base material, wherein the abrasive layers are plural. The abrasive layers in the adjacent areas are formed such that the types of the abrasive particles and / or the particle size of the abrasive particles are different from each other.

The polishing layer in each region of the abrasive material of the present invention may be formed by coating the entire surface of the region with a coating agent for forming a polishing layer, or in the region, for example, an oblique pattern. It may be formed by partially applying a coating agent for forming a polishing layer, such as a checkerboard pattern or a checkerboard pattern.

The base material for the abrasive material in the abrasive material of the present invention is paper, non-woven fabric, synthetic paper or a thickness of 12 to 12 having excellent properties such as mechanical strength, dimensional stability and heat resistance.
A plastic film of about 150 μm, for example, a plastic film made of polyethylene terephthalate, polypropylene, polycarbonate, di-acetate acetate, tri-acetate acetate, polyethylene, polybutylene terephthalate, polyarylate or the like is used.

The polishing layer on the substrate for the abrasive is generally
Polishing of an inorganic fine powder having an average primary particle diameter of 0.1 to 20 μm, for example, aluminum oxide, silicon carbide, silicon nitride, zirconium oxide, chromium oxide, iron oxide, diamond, boron nitride, emery, cerium oxide, etc. Material particles such as polyester resin, butyral resin,
Vinyl chloride-vinyl acetate copolymer resin, acrylic resin,
A coating agent containing as essential components a urethane resin, a polyamide resin, an epoxy resin, a nitrified cotton, a chlorinated rubber, and the like, or a binder resin consisting of a mixture of two or more resins, to a thickness of about 5-100 μm. It is formed.

In the polishing layer, 100 to 1 part of the inorganic fine powder as abrasive particles is used with respect to 100 parts by weight of the binder resin.
It is used in a proportion of about 400 parts by weight.

In order to introduce excellent properties of abrasion resistance and heat resistance into the polishing layer, toluylene diisocyanate (TDI), xylylene diisocyanate (XDI),
By utilizing a coating agent for abrasive layer formed with the addition of isocyanate-based curing agent such as hexamethylene diisocyanate (HMDI), -OH in the binder resin in the coating engineering agents, -NH _2, It is preferable that the polishing layer is a thermosetting resin layer obtained by reacting a functional group such as —COOH with a curing agent.

The amount of the isocyanate-based curing agent added when forming the polishing layer comprising the thermosetting resin layer is determined by the equivalent ratio represented by [isocyanate group (-NCO) / functional group in binder resin]. It is preferably about 0.5 to 10.

Further, in the coating material for forming the polishing layer,
If necessary, a dispersant, an antistatic agent, a dye, etc. are added, and for example, gravure printing, silk printing, reverse roll coating, roll coating, bar coating, comma coating,
It is formed by a blade coating method, an extrusion coating method, or the like.

The solvent of the coating agent for forming the polishing layer may be, for example, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, anone, isopropyl alcohol, ethyl acetate, butyl acetate, depending on the type of binder resin. A single solvent consisting of ethanol or the like, or a mixed solvent of two or more kinds of these is used.

Further, in the polishing material of the present invention, the polishing layer is formed in a plurality of regions, and the polishing layers in the adjacent regions have at least one of the type of abrasive particles and the particle size of the abrasive particles. Are formed differently.
For example, with respect to a tape-shaped abrasive base material, respective polishing layers having different types of abrasive particles or different abrasive particle sizes in parallel to the length direction of the tape-shaped abrasive base material. Area is formed, or the areas of the respective polishing layers in which the types of abrasive particles or the particle sizes of abrasive particles are different are repeated in parallel to the width direction of the tape-shaped abrasive base material. Is formed.

It should be noted that a zone without a polishing layer may be present between adjacent regions of the polishing layer to partition the regions of the polishing layer.

Further, in the polishing material of the present invention, if each region of the polishing layer and the zone where the polishing layer does not exist are formed on the polishing material base material at a predetermined pitch, during polishing work. The abrasive can be mechanically and automatically controlled.

The abrasive material of the present invention having the above-described structure may be in the form of a tape or a sheet.

[0019]

The present invention provides an abrasive having a base material for abrasives and a polishing layer formed on the base material for abrasives,
The polishing layer is formed in a plurality of regions, and the polishing layers in the adjacent regions are different from each other in at least either the type of abrasive particles or the particle size of the abrasive particles.

Therefore, in the polishing operation using the abrasive of the present invention, when performing several steps of polishing steps including rough polishing, intermediate finishing polishing, and final polishing, or different accuracy for each region of the object to be polished. It is not necessary to replace the abrasive material even when performing the polishing finish of
You can perform sophisticated polishing operations.

[0021]

EXAMPLES The specific constitution of the abrasive material of the present invention will be described below with reference to production examples.

Example 1 "Production of coating agent [a] for polishing layer" 60 parts by weight of linear saturated polyester resin "Toyo Boseki Co., Ltd .: Byron # 280", 90 parts by weight of toluene, and 90 parts by weight of methyl ethyl ketone 200 parts by weight of aluminum oxide fine powder "Showa Denko KK: WA # 6000" was added to a resin solution consisting of and dispersed well in a sand mill, and then xylylene diisocyanate "The Inktech Co., Ltd. ): XE
10 parts by weight of "L curing agent (D)" was added, and this was diluted with an equal amount mixed solvent of toluene and methyl ethyl ketone to obtain a coating agent [a] for a polishing layer having a viscosity of 100 cps.

"Manufacture of coating agent [b] for polishing layer" In the manufacturing process of coating agent [a] for polishing layer, instead of aluminum oxide fine powder "Showa Denko KK: WA # 6000" , Fine powder of aluminum oxide "Showa Denko KK: WA #
By using "3000", a coating agent [b] for a polishing layer having a viscosity of 100 cps was obtained.

"Production of coating agent [c] for polishing layer" In the process of producing coating agent [a] for polishing layer, instead of aluminum oxide fine powder "Showa Denko KK: WA # 6000" , Fine powder of aluminum oxide "Showa Denko KK: WA #
By using "600", a coating agent [c] for a polishing layer having a viscosity of 100 cps was obtained.

In "Manufacture of Abrasive Material" [Fig. 1] to [Fig. 2], one side surface of the abrasive material base material 2 made of a tape-shaped polyethylene terephthalate film having a thickness of 25 µ is used for the above-mentioned abrasive layer. The coating agent [a], the coating agent for the polishing layer [b], and the coating agent for the polishing layer [c] are applied by a gravure printing method and dried, and further, in an atmosphere of 50 ° C. for 5 minutes. By subjecting it to aging treatment for a day, a polishing layer 3a made of the coating agent [a], a polishing layer 3b made of the coating agent [b], and a polishing layer 3c made of the coating agent [c] are formed. An abrasive, which is an example product of the present invention represented by, was obtained.

[0026]

EFFECTS OF THE INVENTION In the polishing operation using the abrasive of the present invention, for example, when performing several steps of polishing steps such as rough cutting polishing, intermediate polishing, and final polishing, or different for each region of the object to be polished. Even when performing precision polishing finishing, it is not necessary to replace the polishing material, and efficient polishing work can be performed.

[Brief description of drawings]

FIG. 1 is a plan view of an example of an abrasive material of the present invention.

FIG. 2 is a model cross-sectional view of one example of the abrasive material of the present invention.

[Explanation of symbols]

 1: Abrasive material 2: Abrasive base material 3a, 3b, 3c: Abrasive layer

Claims (1)

[Claims] 1. A polishing material having a polishing material base material and a polishing layer formed on the polishing material base material, wherein the polishing layer is formed in a plurality of regions, and the regions are adjacent to each other. The polishing layers are formed such that at least one of the types of abrasive particles and the particle size of the abrasive particles are different from each other.