JPS63169270A - Abrasive tape - Google Patents

Abstract

PURPOSE:To prevent a polishing flaw from occurring as well as to make uniform finishing attainable, by installing a charge preventive abrasive layer in at least one side of a film-form abrasive tape base material. CONSTITUTION:An abrasive layer 2 may be made up of a binder resin layer inclusive of an abradant subjected to antistatic treatment or another binder resin layer inclusive of an antistatic agent and the abradant-either will do. A binder component is polyester resin or salt, vinegar vinyl resin, or mixed rein of them. Abradant grains to be used for the abrasive layer use a primary grain of 0.1-20mum in grain size of silicon carbide and diamond or the like. The antistatic agent is an amphoteric antistatic agent or the like of a quaternary ammonium salt compound or the like. To manufacture an abrasive tape, the abradant, the binder resin and the antistatic agent are added into such an organic solvent as dissolving the binder resin and the antistatic agent, and they are sufficiently decomposed and dispersed, adjusting a coat agent, and this agent is applied to at least one side of a base material film and dried up.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a polishing tape used for final polishing of magnetic heads and magnetic disks, precision final polishing of molds, and the like.

(Prior Art) In recent years, it has often been necessary for the surfaces of magnetic heads, etc. used in precision mechanical parts and precision electronic parts to be finished to a precision surface of, for example, micron or submicron order. Applying a dispersed resin solution of fine inorganic powder in which fine inorganic powder with high hardness is dispersed in a resin solution is applied onto a film-like base material for polishing tape made of synthetic paper, etc., and then dried to form a polishing layer. Abrasive tape obtained by
Publication No.) etc. are used.

Furthermore, the occurrence of unevenness and scratches due to polishing is often due to the contamination of the polishing tape with dust and foreign matter.
Japanese Unexamined Patent Application Publication No. 2003-120011 (Sho JG-/77.26+) has also been proposed.

(Problems to be Solved by the Invention) However, with the conventional abrasive tape containing carbon powder in the abrasive layer, it is difficult to color the abrasive tape to clearly identify the type of the abrasive tape. In order to store (two parts corresponding to the drawing lines of a tortoise shell shape made up of a large number of substantially regular hexagons arranged substantially evenly in the front, back, left and right, and a part corresponding to the center of each substantially regular hexagon making up the tortoise shell shape) In an abrasive tape that has concave portions, the resistance to particle movement varies due to differences in particle size, specific gravity, and degree of aggregation between abrasive particles and carbon particles during manufacture of the above shape, resulting in separation of particles and final Specifically, it has drawbacks such as the surface of the polishing layer becoming non-uniform.

(Means for Solving the Problems) As a result of intensive research in order to solve the above-mentioned drawbacks of the prior art, the present inventors have found that by forming an antistatic polishing layer with a specific configuration on a base material for polishing tape. The present invention was completed after discovering that the problem could be solved.

That is, the polishing tape of the present invention comprises a film-like polishing tape base material and an antistatic polishing layer provided on at least one side of the base material, and the antistatic polishing layer has the following (a), ( This is an abrasive tape characterized by having the structure of either b) or (c).

(a) A binder resin layer containing an antistatically treated abrasive.

(bl Binder resin layer containing antistatic agent and abrasive.

(c) A binder resin layer containing an abrasive and an antistatic layer provided thereon.

The following will be explained with reference to FIGS. 1 and 2, which schematically illustrate the antistatic abrasive tape of the present invention. FIG. 1 shows seven embodiments of the antistatic abrasive tape of the present invention. FIG. 2 schematically shows a cross section of another embodiment of the antistatic abrasive tape of the present invention.
Two are shown.

As is clear from FIG. 1, in the seven embodiments of the abrasive tape of the present invention, an abrasive layer is formed on at least one surface of the base film. In addition, in the embodiment shown in FIG. 2, the base film is coated with an abrasive M layer on one side, and an antistatic layer 3 is provided thereon.

In FIG. 1 above, the polishing layer may be a binder resin layer containing an antistatically treated abrasive, or a binder resin layer containing an antistatic agent and an abrasive.

In the present invention, the above-described configuration solves the various problems of the prior art abrasive tapes as described above.

Next, the materials and forming method necessary to construct the abrasive tape of the present invention will be explained (more on that later).
-Specific (=explain.

The film-like polishing tape base material of the present invention includes:
Thickness made of polyethylene terephthalate, etc./2-10
A film with excellent properties such as mechanical strength of about 0 μm, dimensional stability, and heat resistance should be used.

In addition, the binder component among the constituent components of the polishing layer is polyester resin, salt/vinyl acetate resin, or a mixed resin thereof, but in order to improve the properties such as abrasion resistance and heat resistance of the resulting polishing layer ( = Toluylene diisocyaner (TDI) in the coating agent for forming the polishing layer,
An isocyanate curing agent such as xylylene diisocyanate (XDI) or hexamethylene diisocyanate (HMDI) is added to cure the functional group (-〇H1) in the aforementioned resin.
-NH2, etc.) to form a binder component using a thermosetting resin. The amount of these curing agents added is preferably such that the equivalent ratio expressed as [isocyanate group (-NCO)/resin functional group] is within a range of about O, S to io.

The abrasive particles used in the abrasive layer of the present invention are, for example, 7th particles of aluminum oxide, silicon carbide, silicon nitride, zirconium oxide, chromium oxide, iron oxide, diamond, boron nitride, emery, etc. with a particle size of 0.7 ~ θμm is used.

The thickness of the training layer is generally about 3 to 0 μm.

The antistatic agents used in the present invention include conventionally known ones, such as cationic antistatic agents such as q-class ammonium salt compounds and imidacillin compounds, alkyl sulfate ester compounds, alkylaryl sulfonic acid compounds,
Anionic antistatic agents such as alkyl phosphate ester compounds★1j, amphoteric antistatic agents such as betaine compounds, nonionic antistatic agents such as sorbitan compounds, ester compounds, or acryl ammonium compounds that have polar groups , silane-based polymer antistatic agents, etc. can be used. Particularly preferred in the present invention are cationic antistatic agents.

Such an antistatic agent may be used by being attached or adsorbed to the abrasive before use, or may be simply added to the coating agent for forming the abrasive layer, but in either case, Based on the solid content, it is appropriate to use it at a ratio of about 0.5 to 20 parts by weight per 100 parts by weight of the binder resin.If the amount used is less than 0.5 parts by weight, a sufficient antistatic effect will not be achieved. On the other hand, if the amount exceeds 20 parts by weight, the bleeding effect on the surface of the abrasive layer will be severe, and the resulting abrasive tape will block or its abrasion resistance will decrease, which is not preferable.

In order to manufacture the abrasive tape of the present invention, one method is to form at least one surface (=abrasive layer) of the base film from the above-mentioned materials using a suitable welding agent, That is, the above-mentioned abrasive (or antistatic-treated abrasive), binder resin, and antistatic agent are added to an organic solvent that dissolves the above-mentioned binder resin and antistatic agent in the proportions described above. , a method in which a coating agent is prepared by dissolving and dispersing the coating agent, and the coating agent is applied to at least one surface of the base film and dried.

Another method is to substantially (=not contain) an antistatic agent.
Alternatively, a method may be mentioned in which a -polishing layer is formed using a coating agent as described above containing a small amount of abrasive, and then an antistatic layer is formed using an antistatic agent on the surface thereof. In such a method, it is preferable to apply and dry the antistatic agent as described above in water or a suitable organic solvent (=dissolved or dispersed). It may be formed on the layer or on the back side of the layer.If such a separate coating method is used, excellent antistatic properties can be imparted to the abrasive tape with a small amount of antistatic agent used. Also, it is preferable because there is no risk of reducing the abrasion resistance of the abrasive tape.The amount of antistatic agent used is preferably about 0.0/~2 bar to provide a sufficient antistatic effect. can.

(Example) Example: 700 parts by weight of polyester resin, 100 parts by weight of alumina fine powder (average particle size/μm), and OH groups in the polyester resin were applied to one side of a polishing tape base material made of a polyester film with a thickness of 50 μm. The relationship between and the NCO group of quinrylene diisocyanate is -NCO/-0H=Hiroshi (equivalent ratio)
A coating agent consisting of xylylene diisocyanate in an amount corresponding to On top of this, the antistatic agent Statyside Concentrated F (Analytical Chemical Laboratories)
was diluted 100 times with IPA, applied by a direct gravure method, and dried to obtain an antistatic polishing tape. The resulting abrasive tape has a surface resistivity of 1010Ω, and an average center line roughness of 0.033 m using this abrasive tape! ;, 2 j
When a 1 nk floppy disk was polished, it was finished with a center line average roughness of 0.03 μm, and no polishing layer was formed.

Example: Vinyl chloride-vinyl acetate copolymer io was coated on one side of a polishing tape base material made of a polyester film with a thickness of 75 μm.
9 parts by weight of a coating agent consisting of parts by weight of silicon carbide fine powder (average particle size 3 μm) qso, and 3 parts by weight of an antistatic agent Alucard T-30 (Lion Akzo) were coated using a reverse roll method to a dry thickness. It was coated to a thickness of 25 μm and dried to obtain an antistatic abrasive tape. The resulting polishing tape has a surface resistivity of 109Ω, and when this polishing tape was used to finish a VH8 magnetic tape with a centerline average roughness of 0,070μm, a polishing finish with a centerline average roughness of O,OS μm was achieved, and there were no polishing scratches. There were no outbreaks.

Using the abrasive tape before antistatic agent coating of Comparative Example/Example/Central line average roughness o, o rμm of 3;, 23;
When a 1-inch floppy disk was polished, a polishing finish with a center line average roughness of o, qμm was achieved, but polishing scratches occurred and a uniform finish could not be obtained.

Comparative Example: Three coats of the abrasive particle dispersion coating agent (to which two parts of carbon black (average particle size 20-3!fmμm) were added) were coated using a reverse roll method to a dry thickness of 2.
After coating and drying, a polishing tape for comparison was obtained for comparison. 5. Center line average roughness o, og μm.
When a 25-inch floppy disk was polished and finished, the center line average roughness was 0.06 μm, and a uniform finish could not be obtained.

(Effect of the invention) As explained above, if the abrasive tape of the present invention is used,
The effect is that a uniform finish can be achieved without the occurrence of polishing scratches.

[Brief explanation of the drawing]

FIGS. 1 and 2 schematically show the cross section of the antistatic abrasive tape of the present invention.・Abrasive particles

Claims (2)

[Claims] (1) In an abrasive tape comprising an antistatic abrasive layer provided on at least one side of a film-like abrasive tape substrate, the antistatic abrasive layer is one of the following (a), (b), (
An abrasive tape characterized by having any of the configurations of c). (a) A binder resin layer containing an antistatically treated abrasive. (b) A binder resin layer containing an antistatic agent and an abrasive. (c) A binder resin layer containing an abrasive and an antistatic layer provided thereon. (2) The polishing tape according to claim (1), wherein the antistatic agent is a cationic antistatic agent.