JPS59135628A - Wear resistant magnetic recording body - Google Patents

Abstract

PURPOSE:To prolong the still reproduction life and to improve the traveling performance by forming vapor-deposited films of higher fatty acid lubricants having higher and lower melting points. CONSTITUTION:The surface of a magnetic film 2 formed on the surface of a nonmagnetic substrate 1 for a tape or the like is coated with a vapor-deposited film 3 of a higher fatty acid lubricant having a relatively high m.p., adhesive strength to the film 2, stripping resistance and relatively high film strength. In order to avoid the contact of the film 3 having a relatively high coefft. of friction with a device such as a reproduction deck, a vapor-deposited film 4 of a higher fatty acid lubricant having a relatively low m.p., high flowability, variableness and a relatively low coefft. of friction is formed on the film 3. The defects of the films 3, 4 are eliminated, and the advantages can be utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in wear-resistant magnetic recording bodies such as magnetic tapes and magnetic disks.

Conventionally, magnetic recording bodies in which a magnetic thin film of Oo, Ni, Fe, or an alloy thereof is formed on a base material surface such as a tape or a disk by oblique incidence evaporation method or oblique incidence ion plating method have a high extraction power. High-density recording is possible. Also, magnetic recording bodies such as magnetic tapes and magnetic disks in which similar metal-sensitive thin films are formed by chemical plating are also widely used. Recently, perpendicularly magnetized Oo-Or alloy thin films have also attracted attention as high-density recording materials. In addition, γFe! Magnetic recording bodies made of oxide magnetic films such as 03 and barium ferrite are also known. However, in general, these magnetic recording media are subjected to severe friction during use with the heads, guide rails, liners, etc. of the recording/reproducing deck, and in the case of VTR tapes, they are subject to severe friction during still playback. As a result, the magnetic film was severely worn out, making it difficult to use it for a long time. We use higher fatty acids due to the drawbacks.

First, we aim to improve the wear resistance of the magnetic recording medium by depositing a higher fatty acid lubricant such as a modern salt, amide, ester, or a derivative thereof on the magnetic film surface and forming a coating with the deposited film. proposed.

The present invention has conducted research on wear-resistant magnetic recording bodies formed in this manner, and as a result of analysis and examination, it has been found that the higher the melting point of the vapor-deposited film of the higher fatty acid-based lubricant, the better the wear resistance and the magnetic property. We discovered that the film has good adhesion in the film direction and high film strength, and that the lower the melting point, the smaller the friction coefficient and the greater the deformability and fluidity.By skillfully combining these two elements, we can create a single vapor-deposited film. In comparison, it provides a wear-resistant magnetic recording material with improved characteristics in both still playback performance and running performance.Higher fatty acids, their metal salts, amides, In wear-resistant magnetic recording bodies of the type in which a higher fatty acid-based lubricant such as ester or its derivative is vapor-deposited to form a vapor-deposited film, a vapor-deposited film of a lubricant with a relatively high melting point selected from the higher fatty-acid-based lubricant is used. After forming the lubricant, a vapor deposited film of a lubricant having a relatively low melting point is laminated on the surface of the vapor deposited film.

Next, one example of implementing the present invention will be explained with reference to the accompanying drawings.

FIG. 1 shows an example of its implementation, in which (1) shows a non-magnetic base material such as a tape, (2) shows a magnetic film formed on the top surface,
According to the present invention, on the upper surface of the magnetic film (2), a lubricant having a relatively high melting point selected from higher fatty acid-based lubricants consisting of higher fatty acids, their metal salts, amides, esters, and derivatives thereof. Preferably, a vapor deposited film (3) of a lubricant having a melting point higher than the melting point of about 80° C. is formed on the upper surface of the vapor deposited film (3), and the higher fatty acid having a melting point lower than this is preferably applied. The wear-resistant magnetic recording body A of the present invention was constructed by laminating the vapor-deposited film (4) of the lubricant-based lubricant. That is, the present invention eliminates the need to select one type of higher fatty acid-based lubricants from the higher fatty acid-based lubricants proposed above and form a single vapor-deposited film thereof. In contrast, a vapor-deposited film (3) of a higher fatty acid-based lubricant with a relatively high melting point, which has relatively high adhesive peeling resistance and film strength, is provided,
A vapor deposited film (4) with a relatively small number of threads and a relatively low melting point is laminated on the outer surface side that will come into contact with the equipment used, such as a recycling deck, and the surface of this vapor deposition film (4) will be placed in contact with the equipment used. Since it is a surface, unlike the case where it consists of only a single vapor deposited film of a relatively high melting point or a comparatively low melting point vapor deposited film, the disadvantages of each are eliminated and the advantages of both are utilized. In comparison, a wear-resistant magnetic recording material with improved properties in both wear resistance and runnability can be obtained.

Next, an example of a method for manufacturing the wear-resistant magnetic recording body of the present invention will be explained with reference to FIG. An unwinding drum (11) provided on one side of a vacuum processing container (5) connected to a vacuum pump is coated with a holding force of 9,500e and a film thickness of 1,500mm by diagonal vapor deposition on the surface of a synthetic resin tape base material (1) in advance. 0o-3 of rent
A magnetic tape with a 0% antimagnetic film (2) formed on it is unwound and made to run at a constant speed along the outer periphery of the can (6), and a reel is placed on the opposite side. Make sure to wind it around the citram (7). A higher fatty acid-based lubricant with a high melting point is evaporated from an evaporation source (9) provided in the processing chamber (5a) on the right side in the drawing cut out by the central partition wall (8) below the can (6). The vapor deposited film (3) is completely formed on the magnetic film (3) surface of the tape a while it is running, and an evaporation source (higher fatty acid-based lubricant with a lower melting point than 101) is installed in the processing chamber (5b) on the left side. The agent is evaporated, and the vapor-deposited film (4) is formed on the previously obtained vapor-deposited film (3) to obtain the wear-resistant magnetic recording body of the present invention on the winding drum (7). In this production, the degree of vacuum in the right processing chamber (5a) and the left processing chamber (5b) is approximately 10'''' torr, and the speed of the tape and the evaporation of the lubricant in each chamber are controlled. The speed is adjusted appropriately, and the thickness of each of the deposited films (3) and (4) is controlled appropriately.

Next, Table 1 below shows a sample example in which the still playback and friction coefficient between a magnetic tape having two layers (31 (41) of the present invention and a magnetic tape from one of the layers) and a friction coefficient were measured.

As is clear from the above table, the magnetic recording material of the present invention improves both the still playback life and the runnability by reducing the friction coefficient.

The present invention is applicable to various magnetic recording materials such as 0o-Or perpendicular magnetic films, chemically plated magnetic films, and magnetic films having a protective film at an angle of 810° on the surface of the magnetic film 2 of oxides such as γ-Fe and 04. However, it is valid for you.

As described above, according to the present invention, a vapor-deposited film of a higher fatty acid-based lubricant having a relatively high melting point is formed on the upper surface of the magnetic film, and a vapor-deposited film of a higher fatty-acid-based lubricant having a lower melting point is formed on the upper surface of the vapor-deposited film. Since the magnetic recording medium is formed with a film, it has the effect of improving its playback life and running performance.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a portion of an embodiment of the present invention, and FIG. 2 is a partially cutaway side view of an apparatus for manufacturing a magnetic recording medium of the present invention.

Claims (1)

[Claims] Higher fatty acids on a magnetic film surface formed on a base material surface. In a wear-resistant magnetic recording material of the type in which a higher fatty acid-based lubricant such as a metal salt, amide, ester, or a derivative thereof is vapor-deposited to form a vapor-deposited film, a relatively melting point selected from the higher fatty acid-based lubricant is used. 1. A wear-resistant magnetic recording body comprising a vapor-deposited film of a lubricant with a relatively low melting point and then a vapor-deposited film of a lubricant with a relatively low melting point formed on the surface of the vapor-deposited film.