JPH01316172A - Abrasive tape and manufacture thereof - Google Patents

Abstract

PURPOSE:To make it possible to perform a finish polishing with a extremely high accuracy by eliminating the presence of cohesive particles resulting from the inter-particle cohesive force among the particles of abrasives, through the adoption of a sedimentation preventing agent of polyethylene oxide derivatives for 0.005 to 10% in weight of solid constituents which form an abrasive layer. CONSTITUTION:In a film-like abrasive tape possessing an abrasive layer at least on one side of the base material of the abrasive tape, 0.005 to 10% in weight of the solid constituent forming the abrasive layer is made from a sedimentation preventing agent of polyethylene oxide derivatives. Due to the action of the preventing agent, the presence of cohesive particles resulting from the inter-particle cohesive force among the particles of abrasives is eliminated, and so is the projection of cohesive particles on the surface of the abrasive layer. As the result, the abrasive tape enables to perform highly accurate finish polishing.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic head and one end surface of an optical fiber.

The present invention relates to an abrasive tape used for machining and final polishing of molds, etc., and a method for manufacturing the same.

[Prior Art] The surfaces of magnetic heads, magnetic disks, etc. used in precision mechanical parts, precision electronic parts, etc. are often required to be finished to a precision surface of, for example, micron or submicron order. In response to the above-mentioned needs, abrasive particles made of a fine inorganic powder with high hardness can be used as a base material for an abrasive tape such as a polyester film.

Polishing is performed using a polishing tape obtained by applying and drying a coating agent containing a binder resin, a solvent, and other additives.

The polishing layer in the polishing tape used for the polishing is formed by using a coating agent made of a dispersion in which abrasive particles made of hard inorganic fine powder are directly dispersed in a binder resin solution. It is what was done.

[Problems to be Solved by the Invention] In a coating agent made of a dispersion of the fine inorganic powder applied to a substrate for an abrasive tape, the wetting of the resin solution to the fine inorganic powder is insufficient;
The specific gravity of the inorganic fine powder in the coating agent is relatively high (
Generally, due to 3.1 to 5.9), the inorganic fine powder in the coating agent tends to aggregate, making it difficult to obtain an abrasive tape with excellent surface uniformity, which is necessary for magnetic heads, etc. This is a problem with precision finishing.

Furthermore, since the coating agent made of the above-mentioned dispersion of inorganic fine powder has low storage stability, during storage of the coating agent, the inorganic fine powder in the dispersion liquid settles and forms on the bottom wall of the storage container. Since the fine inorganic powder aggregates into a cake shape and forms an agglomerated wall, it is impossible to redisperse the fine inorganic powder by stirring or the like. For this reason, storage of coating agents.

During storage, the coating agent must be constantly stirred to prevent sedimentation and agglomeration of the fine inorganic powder in the dispersion, which also has the disadvantage that storage and storage are complicated.

On the other hand, the invention of the youngest brother 1 provides a polishing tape having extremely excellent properties in terms of surface uniformity in the polishing layer, and the invention of the youngest brother 2 provides the abrasive tape of the invention of the youngest brother 1. This provides a method for easily and reliably obtaining.

[Means for Solving the Problems] The abrasive tape of the invention of the youngest brother 1 has an abrasive layer on at least one side of a film-like abrasive tape base material, and in the solid component constituting the abrasive layer. 0.005 of
~10% by weight is composed of oxidized polyethylene anti-settling agent.

In addition, the method for manufacturing an abrasive tape according to the invention of the youngest brother 2 includes abrasive particles and a binder resin on at least one side of a film-like abrasive tape base material.

Coating with solvent, other additives, etc.
A method for producing an abrasive tape comprising forming an abrasive layer by drying, wherein the coating agent applied to the substrate for the abrasive tape contains 0.005 to 10% by weight of the solid components in the coating agent. It utilizes a coating agent whose composition consists of an oxidized polyethylene anti-settling agent.

In each of the inventions 1 and 2 having the above configuration, the base material for the polishing chip 1 includes a resin film having a thickness of about 12 to 150 μm and having excellent properties in terms of mechanical strength, dimensional stability, heat resistance, etc. For example, polyethylene terephthalate,
Polypropylene, polycarbonate, diacetic acid acetate.

Resin films made of triacetic acid acetate, polyethylene, polybutylene terephthalate, polyarylate, etc. are used.

In addition, the inorganic fine powder used as the abrasive particles is the usual inorganic fine powder used to form the polishing layer in this type of polishing tape, such as aluminum oxide, silicon carbide, zirconium oxide, chromium oxide, iron oxide. 1 diamond.

The inorganic fine powder is made of boron nitride, emery, cerium oxide, etc., and has an average primary particle diameter of 0.1 to 60 μm.

Further, examples of binder resins in the polishing layer include polyester resins and salt/vinyl acetate resins.

Polyurethane resin, butyral resin, polyamide resin,
Epoxy resin, acrylic resin, nitrified cotton.

A resin such as chlorinated rubber or a mixed resin of 2 fff1 or more is used, and usually, the amount of inorganic fine powder as abrasive particles is 100 to 14 QOfl per ioo parts by weight of the binder resin.
It is used in small quantities.

The oxidized polyethylene antisettling agent, which accounts for 0.005 to 10% by weight of the solid components in the polishing layer, is adsorbed on the surface of the inorganic fine powder, which is the polishing agent particles, in the coating agent used to form the polishing layer. This suppresses the interparticle cohesive force of the inorganic fine powder, and has the effect of preventing the inorganic fine powder from becoming agglomerated particles. Therefore, in the coating agent to which the oxidized polyethylene anti-settling agent is added, the inorganic fine powder is well dispersed during the storage and storage of the coating agent, and the inorganic fine powder is dispersed in the storage container. Even when the fine inorganic powder settles on the bottom wall of the inorganic powder, the fine inorganic powder does not aggregate into a cake, and the fine inorganic powder can be redispersed by a simple stirring operation.

In the dispersion of inorganic fine powder that is the coating agent, when the polyethylene oxide sedimentation preventive agent is less than 0.005% by weight of the solid components in the coating agent, the above-mentioned inorganic fine powder by the polyethylene oxide sedimentation prevention agent is The anti-sedimentation effect of the powder is not sufficient, and if it exceeds 10% by weight, there are disadvantages such as severe clear separation of the coating agent and a decrease in the polishing performance of the resulting polishing layer. The oxidized polyethylene anti-settling agent is blended as a composition component accounting for 0.005% to 10% by weight of the solid components in the coating agent.

The oxidized polyethylene anti-settling agent is used in the dispersion process of inorganic fine powder when obtaining a coating agent, that is,
It may be added either before or after the dispersion process using a dispersion machine such as a sand mill or a ball mill.

In addition to the above-mentioned inorganic fine powder as abrasive particles, a binder resin, and an oxidized polyethylene anti-settling agent, the coating agent may appropriately contain additives such as a dispersant, an antistatic agent, and a dye. In addition, there are
An isocyanate-based curing agent is added to improve the abrasion resistance, solvent resistance, heat resistance, etc. of the resulting polishing layer, and at the same time to improve the adhesion between the polishing layer and the polishing tape substrate. The polishing layer can also be made of a curable resin layer.

Furthermore, the coating agent for forming the polishing layer includes a solvent depending on the type of the binder resin, such as doluol, kijirole, methyl ethyl ketone, methyl isobutyl ketone, and alan. A solvent consisting of ethyl acetate, butyl acetate, etc. or a mixed solvent of two or more of these is used, and a coating agent having a viscosity of about 10 to 10,000 cps is prepared.

The coating agent is applied to the abrasive tape substrate described above so as to obtain an abrasive layer with a thickness of about 3 to 100 μm.

Furthermore, in the method for manufacturing an abrasive tape according to the invention of Hyouka 2,
The step of applying the coating agent to the abrasive tape substrate includes, for example, roll coating using two rolls, three rolls, four rolls, etc., gravure coating, kiss coating, knife coating, bar code coating, rod coating, etc. This is done by a coating method such as comma coating, spray coating, park coating, etc. In particular, for roll coating and gravure coating, both the direct method and the reverse method can be used.

[Operations and Effects of the Invention] The abrasive tape of the invention of Hyouka 1 has an abrasive layer on at least one side of a film-like abrasive tape base material, and 0 in the solid component constituting the abrasive layer. .005
~10% by weight consists of oxidized polyethylene anti-settling agent.

In addition, the method for manufacturing an abrasive tape according to the invention of Wood Brush 2 includes abrasive particles and a binder resin on at least one side of a film-like abrasive tape base material.

Coating with solvent, other additives, etc.
A method for producing an abrasive tape comprising forming an abrasive layer by drying, wherein the coating agent applied to the substrate for the abrasive tape contains 0.005 to 10% by weight of the solid components in the coating agent. It utilizes a coating agent whose composition consists of an oxidized polyethylene anti-settling agent.

Therefore, in the abrasive layer of the abrasive tape of the invention of Wooden Pen 1, agglomerated particles due to the interparticle cohesive force of the abrasive particles are formed by the action of the oxidized polyethylene anti-settling agent on the abrasive particles in the abrasive layer. Since there is no presence of convex portions caused by the agglomerated particles on the surface of the polishing layer, it is possible to achieve a highly accurate polishing finish by polishing with the polishing tape.

In addition, in the method for manufacturing an abrasive tape according to the invention of Mokushi 2, during storage of the coating agent used to form the abrasive layer, inorganic fine powder in the coating agent settles to the bottom of the storage container. There is no cake-like agglomeration of the inorganic fine powder on the wall, the coating agent can be easily stored and preserved, and the abrasive tape of the invention of Wood Flute 1 can be manufactured easily and reliably. It is.

[Indeed!] Hereinafter, the specific structure of the manufacturing method of the abrasive tape of the invention of Woodbrush 1 and the abrasive tape of the invention of Woodbrush 2 will be described with reference to manufacturing examples.

Example 1 An abrasive particle-dispersed resin liquid "■" was obtained by thoroughly dispersing the solid components of a mixed composition consisting of the following composition "a" using a sand mill.

On the fine cliff qmra (1) Fine silicon carbide powder ・・・・・・・・・・・・・・・
...200 parts by weight "Fujimi Abrasives Industry Co., Ltd."
WA#4000 J (2) Polyester resin...
・・・・・・・・・・・・・・・ 40 parts by weight “Toyobo Co., Ltd.: Resin for binder (3) Toluene”
・・・・・・・・・・・・ 60FIL ffi K(
4) Methyl ethyl ketone・・・・・・・・・・・・・・・
・60 parts by weight (5) Oxidized polyethylene paste...
... 3 parts by weight "Kusunoki Kasei Co., Ltd.: Disparon #4
200-20'' Next, toluylene diisocyanate ``Sumitomo Bayer Co., Ltd.: Sumidur F-80J'' was added to the obtained abrasive particle dispersion resin liquid ``■''. Group (
-NGO) and the hydroxyl group (-OH) of the polyester resin in the abrasive particle-dispersed resin liquid, that is, (-NGO)/(-OH) was 3, and the bow 1 By selling yarn, I obtained toluene and methyl ethyl ketone coating agent.

Thereafter, the coating agent was applied to an abrasive tape base material made of a polyethylene terephthalate film with a thickness of 50 μm using a three-roll reverse roll coating method, and dried.
Furthermore, 40t.

The tape was subjected to an aging treatment for 7 days and cut into tapes with a width of 10 mm to obtain an abrasive tape ri, which is an example of the first invention and has an abrasive layer with a thickness of 10 mm.

Example 2 After thoroughly dispersing the solid components of a mixed composition consisting of the following composition "b" using a sand mill, 5 parts by weight of oxidized polyethylene fluid paste "Disparon #4200-10J manufactured by Kusunoki Kasei Co., Ltd." was added. By doing this, a resin liquid containing abrasive particles was obtained.

Composition “b” (1) Silicon carbide fine powder ・・・・・・・・・・・・・・・
...200 parts by weight "Fujimi Abrasives Industry Co., Ltd.: W #4000 J (2) Polyester resin...
・・・・・・・・・・・・ 40 parts by weight "Toyobo Co., Ltd."
: Byron #300J (3) Toluene...
・・・・・・・・・・・・・・・・・・・・・ 60
Part by weight (4) Methyl ethyl ketone...
... 60 parts by weight Next, the following formulation exactly as in the case of the abrasive particle-dispersed resin liquid "I" in Example 1 was applied to the obtained abrasive particle-dispersed resin liquid r II J. After preparing a coating agent, a polishing tape "r ii" which is an example product of the first invention having a polishing layer with a thickness of 10 mm was further prepared in the same manner as in Example 1. Obtained.

Comparative Example 1 Abrasive particle-dispersed resin liquid rIII was produced using the same recipe as in Example 1, except that the oxidized polyethylene fluid paste was omitted from the manufacturing process of abrasive particle-dispersed resin liquid rIJ in Example 1. Prepare J, and further,
Similar to the case of Example 1, a polishing tape 'ii as a comparative example of the first invention having a polishing layer with a thickness of 10 mm was prepared.
I got 1.

Comparative Example 2 In the manufacturing process of the abrasive particle dispersion resin liquid "I" in Example 1, instead of the oxidized polyethylene paste r m Hon Kasei Co., Ltd.: Disparon #4200-20, the vegetable oil "Sichiku" was used. An abrasive particle dispersion resin liquid r IV J was prepared using the same recipe as in Example 1 except for adding ``KI Oil'', and further, in the same manner as in Example 1, Abrasive tape ri, which is a comparative example of the first invention, having an abrasive layer with a thickness of 10)
v" was obtained.

Experiment 1 Using each of the polishing tapes obtained in the Examples and Comparative Examples, 100 single-crystal ferrite IB heads for VTRs were polished.

As a result of the polishing, the polished surface of the magnetic head has 5
The number of products that have chipping of μ or more and are considered defective in polishing are as follows: Polishing tape ri" ...... 2 pieces Polishing tape 'ii" ...... 3 pieces Polishing tape 'iii
” ...15 polishing tapes riv, ・
...There are 10 pieces.

Experiment 2 The abrasive particle-dispersed resin liquids used in the Examples and Comparative Examples were allowed to stand for 15 days in a container, and then stirred using a stirrer.

Through the above stirring operation, it was confirmed that in the abrasive particle-dispersed resin liquid "I" and rIT J, the abrasive particles were dispersed in the resin liquid very easily and had an extremely excellent effect in terms of storage stability. However, in the abrasive particle-dispersed resin liquids r III J and r IV J prepared for comparison, the abrasive particles aggregated into a cake shape along the wall of the storage container, and were not regenerated even by the stirring operation. There was no dispersion.

Claims (1)

[Scope of Claims] 1. In an abrasive tape having an abrasive layer on at least one side of a film-like abrasive tape base material, 0.005 to 10% by weight of the solid component constituting the abrasive layer is polyethylene oxide base material. An abrasive tape characterized by being an anti-settling agent. 2. A method for manufacturing an abrasive tape comprising applying a coating agent containing abrasive particles, a binder resin, a solvent, other additives, etc. to at least one side of a film-like abrasive tape base material, and drying the coating. 0 in solid components
．． 005-10% by weight of a coating agent comprising an oxidized polyethylene anti-settling agent.