JPS5919235A - Magnetic tape - Google Patents

Abstract

PURPOSE:To eliminate the contamination and deformation of a magnetic recording surface and to improve running performance by providing a metal of thin film on the rear of the substrate for a magnetic tape, and applying a halogen element and a rust preventive agent on the surface thereof. CONSTITUTION:Most of materials are usable for a metal of thin film and the materials selected from the group of Zn, Al, Cu is superior in terms of the adhesive strength to a substrate, stability and economy. A halogen element is directly applied to the metal of thin film and it is also effective that said element is applied in the form of the fluorine substituent of org. compds., among which the form of fluorine alone or a flurive-base activator is more preferable. The rust preventive agent is benzotriazole (BTA) of a triazole type, 1,10-bis(N-salicyloyl amino)dodecandiamide (CDA) of an amide type, alpha-nitroso-beta-naphthol (NBN) of a naphthol type, etc. The magnetic material formed by vapor-depositing a Co alloy as represented by Co-Ni among the materials of coating type and vapor deposition type is more effective as the magnetic material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the running properties of a magnetic tape for magnetic recording.

Conventionally, magnetic tapes have been provided with a coating layer on the back surface to improve running properties. This coating layer contains carbon black, which greatly contributes to reducing the coefficient of friction. However, Carposi Black contains secondary particles,
In addition to roughening the surface of the coating layer, it also has the drawback of contaminating or deforming the magnetic recording layer due to contact with the magnetic recording layer in the rolled state. As a result, when playing back recorded images,
This caused a signal loss phenomenon called dropout.

In view of these inconveniences, the present invention provides a thin metal film on the back surface of a magnetic tape support, and adds Roggesi element and a rust inhibitor to the metal surface, thereby eliminating the contamination that has conventionally occurred. To provide a magnetic tape that is free from deformation and has high running properties.

In other words, a thin metal film is used in place of the conventional back coating layer to provide the antistatic function that carbon black has. The halogen element and a rust preventive agent that improves the durability of the thin metal film collectively improve the running performance of the magnetic tape.

Most materials can be used for thin film metals, but among them:
Those selected from gY of Zn, Aβ, and Cu are! It is excellent in terms of strength, stability, and economy in terms of access to special holidays.

Further, the halogen element may be applied directly to the thin film metal or may be applied in the form of a fluorine substituted organic compound, but among these, fluorine alone or in the form of a fluorine-based activator are heavy.

As the fluorine-based M agent, perfluoroalkyl sulfonate (F-110), perfluoroargyl carboxylate (F-120), perfluoroalkyltrimethylammonium salt (F-150), perfluoroalkyl phosphoric acid Salt (F-191) is available immediately.

As a rust preventive agent, triazole-based becizotriazole (BTA) and 3-(N-salicyloyl)amino-1,2,4-triazole (TST) are used.

Amide-based 1,10-bis(N-salicyloylamino)
Toticandiamide (ODA), naphthol type α--
1-Niso β-naphthol (NBN) and other thiazoles,
There are dithiocarbamate and thiuram disulfide types.

As for the magnetic phase H, there are coated type and vapor deposited type, and G
It is more effective to deposit a CO-based alloy such as o-Ni.

Examples of the present invention will be described in detail below.

Example Examples of the present invention are summarized in the table below.

(Left below) Fu: Go-Nitd in the table above, a cobalt-nickel alloy in the form of a thin film of about 1500X from vapor deposition method V.
7'-FezO, + is an approximately 10 μm thick film of VCC approx.

TAU-=approximately 10 μm thick film of cellulose acetate;
k11! , Gu, and Zn are metals corresponding to the element symbols, and are in the form of a thin film of about 100 OA.

'I:. /This is the source of the halogen element, which is a feature of the present invention. Among the rogeshing agents, SnF2 is a source of halogen elements, which is a feature of the present invention.
I is triuno 1, and F-110 to F-191 are the above-mentioned fluorine-based activators. The abbreviations for rust preventives are as described above. These rogens and rust preventives are water.

Dispersed in molecular or particulate form (used in -7) in a dispersion medium such as isopropyl alcohol, ethyl alcohol, di/dylformaltech F, or a mixed system.

The concentration of the dispersoid is about 60 to 11,000 pp, and the amount of 14 deposited on the surface of the thin film is several hundred amperes.

Now, Shio et al. evaluated the magnetic tapes obtained in Examples 1 to 14 of Example 1 (
illi L, Tadokoro, (ilJ) Compared to the conventional magnetic tape made of carbon, there is almost no contamination or deformation of the magnetic tape even in the rolled state, and Dronopau L at the time of birth of both images. The improvement was to an almost unnoticeable level, and there was no problem of morning sickness due to charging.

When '=1, the drawback of only thin film metals, such as poor running performance, can be solved by the presence of fluorine. For example, the coefficient of friction of 0.5 to 0.6 on the thin film metal surface decreases to a level of 0.3 to 0.4, causing power loss in the magnetic tape drive system.
The problem of no tape is completely eliminated.

Adding a halogen element alone was not sufficient in terms of surface and monocorrosion properties, but by combining it with a rust preventive agent, the surface monocorrosion resistance in high humidity conditions at 400G or 60°C was approximately 2.
improved twice.

Although the fluorine element and rust preventive agent of the present invention significantly contribute to the improvement of these frictional coefficients and corrosion resistance, the details of how they adhere to the thin film metal surface are not clear.

For example, add 20% each of the halogenating agent and rust preventive agent in the table above.
When deposited in separate batches and when deposited with the same dispersion of 5~ζU
゛16 mix and put A/1/The difference from this case is almost *'fJ, V)'; :1 1 Naka,/Ko. I believe that this is one of the reasons why ultra-thin films are not formed on both sides of the metal surface (1) and (1). Since the effect hardly decreased even after washing with [-], it is considered that fasitelwaalska and chemical bond coexist.

In the above table, there is no superiority difference between PF, T and TA in terms of supports, but 011 is the best in terms of thin film metals, followed by KAβ and Zn in that order. )・SnF2 is the best among rogens, followed by F −1 91 .

F-120, F-150, and F-110 follow in that order, and BTA is the best rust preventive, followed by ODA.

BTA and TST followed. However, these differences are not limited to this.

As described above, the magnetic tape of the present invention allows high quality reproduced images to be stably obtained, and has great industrial value.

Claims (1)

[Scope of Claims] (1) A magnetic tape comprising a magnetic material on one side of a support and a thin metal film on the other side, and a halogen element and a rust preventive agent on the surface of the thin metal film. . (2) The magnetic tape according to claim 1, wherein the fluorine element is fluorine. (3) The magnetic tape according to claim 2, wherein the fluorine is fluorine constituting a fluorine-based activator. (4) Fluorine M? The M agent is perfluoroalkyl sulfone l, perfluoroalkylcarpodate. 4. The magnetic tape according to claim 3, comprising at least one member selected from the group consisting of perfluoroalkyltrimethylammonium salts and perfluoroalkyl phosphates. (6) The rust inhibitor is triazole-based or imiguzol-based. 2. The magnetic tape according to claim 1, comprising at least one compound selected from the group consisting of thiazole, dithiocarbamate, thiuram disulfide, amide, and naphthol. (6) The magnetic tape according to claim 5, wherein the triazole compound is either benzotriazole or 3-(N-salicyloyl)ami7-1°2.4-)riazole. (7) The magnetic tape according to claim 5, wherein the amide compound is 1,10-bis(N-salicyloylamino)thicandiamide. (8) The magnetic tape according to claim 5, wherein the naphthol compound is α-nidrow-β naphthol. (9) The magnetic tape according to claim 1, wherein the magnetic material is a CO-based alloy. (10) A magnetic tape according to claim 1, characterized in that the thin film gold (waste) is made of one kind selected from the group consisting of Zn, A4, and Cu.