JPS6066326A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To improve wear resistance and to extend a still life by providing a protective layer contg. a higher fatty acid of which H of the alkyl group is substd. with halogen or the salt thereof or the ester thereof on the surface of a thin ferromagnetic metallic film provided on a base body. CONSTITUTION:A thin ferromagnetic metallic film consisting of Co, etc. is formed on a base body consisting of a polyester film, etc. and a soln. prepd. by dissolving a higher fatty acid such as palmitic acid, behenic acid or the Li salt, Na salt, Ca salt, Mg salt thereof or methyl ester - butyl ester thereof of which a part or the whole of H of the alkyl group is substd. with halogen such as F, Cl, Br at about 0.1% in a solvent mixture composed of toluene and ethanol is coated on the surface of said film to form a protective film to about 400Angstrom . The magnetic recording medium which is improved in wear resistance and still life is thus obtd.

Description

[Detailed description of the invention] The present invention relates to magnetic recording media.

In the past, coated type magnetic recording media such as magnetic tapes and magnetic disks were mainly used, but recently, coated type magnetic recording media, in which ferromagnetic metal is attached to a substrate by vacuum evaporation or ion blating, are being used. Things have come to be used instead.

However, such a magnetic recording medium has the disadvantage that the magnetic decoy is thin and easily damaged, and has low wear resistance. In order to improve such drawbacks (, -1 communication), magnetic f
Although a protective layer is provided on the surface of the LH resin, it has the disadvantage that it does not provide sufficient wear resistance for practical use.

The present invention aims to improve the above-mentioned drawbacks and provide a magnetic recording medium with improved wear resistance.

In order to achieve the above object, the present invention provides a magnetic recording medium in which a ferromagnetic metal thin film is provided on one body and a protective layer is provided on the surface of the ferromagnetic metal thin film. Magnetic recording characterized by having a higher fatty acid or a salt thereof or a sprue thereof in which the hydrogen of the 1 group is replaced by a 1-1 group. It's 1j, it's a ril thing.

Hereinafter, the present invention will be explained based on examples.

As the substrate, a polymer film such as polyester Delf, Clum, etc. is used. This n1 body is coated with iron, nickel, or an alloy thereof by vacuum vaporization, X' ion plating, or sputtering.
.

The ferromagnetic metal particles are deposited to form a ferromagnetic metal pattern. A protective layer is then formed on the surface of this ferromagnetic metal thin film. Ho J? j is
Valmitic acid, stearic acid, and behenic acid ^ Machine ship 1]
/j acids, l'J lithium salts, sodium salts, calcium IJ5, magnesidium salts of these higher fatty acids, or argyl groups of substances such as methylnisder, ethylconispur, and butyl esters of these higher fatty acids. It is made of a substance in which part or all of the hydrogen in the liquid is replaced by halogen such as fluorine, chlorine, or bromine, and is formed by coating.

In other words, the bonding energy of alkyl groups such as higher fatty acids to C-halogen group elements is greater than that of C-1-1 bonds, and for this reason, the surface of the protective layer made of such substances is used for magnetic heads, etc. Even if you rub it, parts of it will not peel off easily. Therefore, characteristics such as steel life as a magnetic recording medium are also improved.

For example, a poly 1 sprue film with a thickness of 15 μm is used as a substrate, a ferromagnetic metal of CO is deposited by vacuum evaporation method (=J) to form a ferromagnetic gold layer fI film, butyl stearate is used as a higher fatty acid, and this alkyl There are 4 hydrogens in yl [
1 cuff 1 replaced with salt cord was replaced with toluene:ethanol=
1:1 ratio) kneaded melt 1! A 0.1% solution of ferromagnetic gold 1i'i, thin IIB, was applied to the surface of J+7.
Example of the present invention in which a protective layer was formed by coating 8400Δ, and the protective layer was a solution of 0.1% butyl stearate dissolved in a solvent containing 11 in a ratio of 1-luene:ethanol-1:1. 'hY was manufactured under the same conditions as in the embodiment of the present invention described above except that -C was coated and -C was formed.

The steel life of the previous example was measured in 1, and the steel life of the example of the present invention was 50 minutes, but with kl L,
The conventional example takes 20 minutes, and the time according to the present invention is 2.5 times longer.

J3, in the above example, the protective layer is made of ferromagnetic 111 gold 1j
Although it is provided directly on the surface of the S thin film, in the example of 1 [11], it is assumed that an intermediate layer such as a metal m It may be made into a structure.

As described above, according to the present invention, the cold insulation layer has a resistance of 1? A magnetic i;i3 recording medium with improved wear resistance and steel life can be obtained.

Claims (1)

[Claims] (1) In a magnetic recording medium in which a ferromagnetic metal thin film is provided on the substrate and a protective radius is provided on the surface of the ferromagnetic metal thin film, a higher fatty acid or its salt or its salt is obtained by directly replacing the hydrogen of an alkyl group with a halogen. The protective layer containing ester is gQ k
A magnetic recording medium characterized by