JPH0337820A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To form the magnetic recording medium having excellent durability by using a magnetic layer contg. C, H and O components and holds an epoxy compd. to form the magnetic layer of the magnetic recording medium on a nonmagnetic base. CONSTITUTION:The magnetic layer of the magnetic recording medium having the magnetic layer on the nonmagnetic base consists of the C, H and O and holds the epoxy compd. expressed by formula. In the formula, n and l denote 0 or 1 to 23 integer; m denotes 1 or 2. More preferably, the combination to make 11<n+3m+l<23 is adopted. The epoxy compd. is added to the magnetic recording medium preferably at 0.05 to 15pts.wt. per 100pts.wt. magnetic material and the combination use of the compd. with a lubricant, for example, ester, such as butyl stearate, fatty acid, such as oleic acid, and hydrocarbon, such as squalane, is possible. The durability is improved in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium with excellent durability.

[Is the problem that the prior art and the invention are trying to solve] Magnetic recording media slide violently against magnetic heads and pads during recording and reproduction, and the magnetic layer is not easily worn out, so the magnetic layer has less wear and durability. Excellent products are desired.

Therefore, as measures to improve the wear resistance of the magnetic layer, methods such as an internal addition method in which various lubricants are mixed into the magnetic layer, and a tosobu coating method in which a lubricant layer is formed on the surface of the magnetic layer have been used.

Conventionally used lubricants include higher fatty acids and their esters, fatty acid amides, liquid paraffin, and silicone oils.

However, it is currently difficult to say that these lubricants are satisfactory in terms of performance.

[Means to solve the problem]

The present inventor has arrived at the present invention as a result of intensive research in order to obtain a magnetic recording medium that is provided with good lubricity and has significantly improved durability.

That is, the present invention provides a magnetic recording medium having a magnetic layer on a non-magnetic support, characterized in that the magnetic layer holds an epoxy compound represented by the following general 2 (11). It provides a medium.

(In the formula, n and l are 0 or an integer of 1 to 23, and m is 1 or 2.) Epoxy compound represented by the general formula (1) according to the present invention (hereinafter abbreviated as compound (1)) ), as mentioned above, n and l are 0 or an integer from 1 to 23, and m is 1
or 2, preferably 11<n+3m-tl! <
This is a combination of 23.

The amount of compound (1) added to the magnetic recording medium in the present invention is preferably 0.05 to 15 parts by weight per 100 parts by weight of the magnetic material.6 If necessary, other general-purpose lubricants, such as butyl stearate, etc. It may be used in combination with esters such as esters, fatty acids such as oleic acid, and hydrocarbons such as squalane.

The compound (1) in the present invention can be used by being mixed into the paint in advance, or by impregnating it into the paint film by applying a solution of a general-purpose solvent such as isopropanol or hexane and drying after forming the magnetic paint film. .

The same method can also be applied to media in which a magnetic layer is formed on a non-magnetic support by spucking or vapor deposition.

The magnetic powder used in the magnetic recording medium of the present invention includes fine needle-shaped T-FelO=, FexOa+ Crew
Metal oxides such as, also GO-deposited - FeJz+ C
.

γFe processed like doped 1-Fe, O,
d1h, metallic iron powder, microplate-like barium ferrite and some of its Fe atoms are Tt+Co, Zn+ν,
Magnetic powder substituted with 1111 or two or more types such as Nb,
Examples include ultrafine powder of metals or alloys such as Co, Fe-Co, and Fe-Ni. Among these, metallic iron powder is particularly unstable chemically, and in order to improve this, metal atoms such as nickel, cobalt, titanium, silicon, aluminum, etc.
Salts and oxides can also be used, although they may be added in small amounts or surface treated. Metallic iron powder also forms a thin oxide film on its surface in a weakly oxidizing atmosphere to stabilize it. :Although metal powder treated in this way can also be used. In addition, the magnetic powder mentioned above is
More than one species may be mixed and used.

Examples of the binder used in the present invention for dispersing magnetic powder to form a magnetic layer include polyurethane, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyacrylonitrile, nitrile rubber, epoxy resin, Alkyd resin, polyamide, polyacrylic ester,
Examples include polymethacrylic acid ester, polyvinyl acetate, polyvinyl butyral, vinylidene chloride, nitrified cotton, maleic acid-modified vinyl chloride/vinyl acetate copolymer, and ethyl cellulose.

These may be used alone or in combination of two or more, and a plasticizer or curing agent may be added to adjust the hardness of the resin.

In addition to the above-mentioned components, additives such as abrasives and antistatic agents commonly used in this field can be added to the magnetic layer of the magnetic recording medium of the present invention.

Examples of the nonmagnetic support used in manufacturing the magnetic recording medium of the present invention include polyesters such as polyethylene terephthalate; polyolefins such as polyethylene and polypropylene; and cellulose BJ'? such as cellulose triacetate and cellulose diacetate. '21 bodies;
Polycarbonate; polyvinyl chloride; polyimide; plastics such as aromatic polyamide; A1. Metal such as Cu; paper, etc. are used. The support may be in any form such as a film, tape, sheet, disk, card, or drum, and the surface of the support may be treated with corona discharge, radiation, ultraviolet light, etc., or may be precoated with an appropriate resin.
ζ is also good.

〔Example〕

EXAMPLES The present invention will be explained in more detail below with reference to Examples, but it goes without saying that the present invention is not limited to these Examples.

Examples j to 4 Metallic iron powder ioo parts by weight Vinyl chloride-vinyl acetate copolymer "il - polyurethane resin" 11 = carbon blank (antistatic agent) 2 /-Cr20* (
Abrasive) 10〃 Toluene 71〃, Methyl ethyl ketone 71 Cyclohexanone Note) 107 parts by weight Umbrella 1: Union Carbide Co., Ltd., product name vAGH City 22, Nippon Polyurethane Co., Ltd., product name N-2301 The above assembled bottom was mixed in a sand mill for 10 hours. After that, it was taken out through a filter, and immediately before coating, 4.4 parts by weight of a curing agent was added and stirred. This paint was applied to both sides of a 32μ thick polyethylene terephthalate film so that the magnetic layer thickness after drying would be 4μ, dried and rolled up. This was calendered and cured, then punched out into a disc shape, and a 2.0% by weight isopropanol solution of the lubricant shown in Table 1 was added.
Sample disks were prepared by applying the lubricant shown in Table 1 in an amount of 600 cm/bot.

Table Comparative Examples 1 to 4 Sample disks were prepared in the same manner as Examples 1 to 4, except that each 'M1 lubricant shown in Table 2 was used instead of the lubricant used in Examples 1 to 4. .

Table Test Example In order to examine the durability of the sample disks obtained in Examples 1 to 4 and Comparative Examples 1 to 4, each sample disk was stored in a hollow lined with non-woven fabric, loaded into a recording/playback device, and placed in the same trunk. I ran Hendo continuously on the top. The circumferential speed at this time is 7 n/sec.

After a certain number of passes, the damage to the magnetic layer of the sample disk was visually evaluated. The state with no scratches was rated as ◎, and the following 89 values were given as O1△ and × in descending order of the number of scratches.

The results are shown in Table 3.

table

Claims (1)

[Scope of Claims] 1. A magnetic recording medium having a magnetic layer on a non-magnetic support, characterized in that the magnetic layer holds an epoxy compound represented by the following general formula (1). recoding media. ▲There are mathematical formulas, chemical formulas, tables, etc.▼(1) (In the formula, n and 1 are 0 or an integer from 1 to 23, and m is 1 or 2.)