JP2002025038A - Magnetic recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high recording density magnetic recording medium having a superior lubricating effect in a wide temperature range, less liable to stick to a head and capable of stably ensuring running durability. SOLUTION: In the magnetic recording medium obtained by disposing a magnetic layer consisting essentially of a ferromagnetic powder and a binder as a monolayer on at least one face of a nonmagnetic substrate or disposing the magnetic layer as a multiple layer on one face of the substrate by way of a nonmagnetic layer consisting essentially of a nonmagnetic powder and a binder, a fatty acid compound, a fatty acid ester compound and an alkanol fatty acid amide compound are contained in the magnetic layer and/or the nonmagnetic layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium comprising a ferromagnetic powder dispersed in a binder and coated on a non-magnetic support, and more particularly, to an excellent lubrication effect in a wide range of environments. The present invention relates to a magnetic recording medium for recording and reproducing digital signals at a high recording density, which has excellent durability, durability, and good head adhesion.

[0002]

2. Description of the Related Art In recent years, a magnetic recording medium is required to have a high recording density, and a magnetic recording medium having excellent short-wavelength recording characteristics is required. Magnetic recording media include a magnetic recording medium having a single magnetic layer and a multilayer magnetic recording medium having both a non-magnetic layer and a magnetic layer. In order to obtain a magnetic recording medium having a high recording density, both magnetic recording media have a high recording density. As one of the means, the surface of the magnetic layer is smoothed.

However, when the surface of the magnetic layer is smoothed to improve the electromagnetic conversion characteristics, contact between the magnetic recording medium and a head or a guide pin, which is a device of the magnetic recording medium, increases, so that friction increases. May be damaged by the equipment and, in extreme cases, peel off.

[0004] In order to solve such a problem, many methods have been proposed in which a lubricant is used in a coating film of a magnetic recording medium. For example, JP-B-57-4967, JP-B-57-4967
-12208, JP-B-59-39810, JP-B-0
Each publication of JP-A-1-25136 discloses that a saturated or unsaturated fatty acid, a saturated or unsaturated fatty acid ester, a saturated or unsaturated fatty acid amide compound is used as a lubricant in a magnetic layer, and that these lubricants and binders are used. Proposals have been made in combination with a resin. Also, JP-A-60-87
No. 426 proposes to include a fatty acid dialkanolamide in a magnetic layer in order to enhance running properties and durability.

[0005]

However, the technology disclosed in each of the above publications, which uses a lubricant or a combination with a resin alone, does not provide the durability and reliability required of recent high-density magnetic recording media. At present, a magnetic recording medium satisfying the characteristics has not been obtained.

Accordingly, an object of the present invention is to provide a high recording density magnetic recording medium which has an excellent lubricating effect under a wide range of temperature conditions, has good head adhesion, and can stably obtain running durability. It is in.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, a magnetic recording medium having a single magnetic layer has both a magnetic layer and a nonmagnetic layer and a magnetic layer. In a multilayer magnetic recording medium, the above object can be achieved by including a specific alkanol fatty acid amide compound (N-hydroxyalkyl fatty acid amide) in both or one of these layers together with a specific fatty acid and a fatty acid ester. And completed the present invention.

That is, in the magnetic recording medium of the present invention, a magnetic layer mainly composed of a ferromagnetic powder and a binder is formed as a single layer on at least one surface of the nonmagnetic support, or the magnetic layer is bonded to the nonmagnetic powder. A magnetic recording medium provided as a multilayer with a non-magnetic layer containing an agent as a main component and the magnetic layer and / or
Or 1) a general formula, R ¹ COOH (wherein R ¹ has 12 to 2 carbon atoms)
At least one fatty acid compound represented by the formula: R ² COOR ³ (wherein R ² has 12 to 12 carbon atoms).
22) a saturated or unsaturated aliphatic hydrocarbon group, R ³ represents a saturated or unsaturated aliphatic hydrocarbon group having 4 to 22 carbon atoms), and at least one fatty acid ester compound represented by the formula: At least represented by the general formula, RCONHC _n H _{(2 × n)} OH (wherein, R represents a saturated or unsaturated aliphatic hydrocarbon group having 10 to 22 carbon atoms, and n represents an integer of 1 to 5). 1
And at least one kind of alkanol fatty acid amide compound.

In the magnetic recording medium of the present invention, preferably, the fatty acid compound of 1) is added in an amount of 0.1 part by weight to 100 parts by weight of the ferromagnetic powder or 100 parts by weight of the nonmagnetic powder.
1 to 5 parts by weight of the fatty acid ester compound of the above 2) in an amount of 0.1 to 5 parts by weight.
1 to 5 parts by weight, and 0.05 to 3 parts by weight of the alkanol fatty acid amide compound of the above 3).

Although studies have been made on magnetic recording media using a combination of the fatty acid of 1) and the fatty acid ester of 2), a lubricating effect sufficient to obtain the desired properties in the present invention has not been obtained. Had not been reached. In addition, among various fatty acid amide compounds, only a limited number of fatty acid amide compounds that can be used as a lubricant for a magnetic recording medium are discharged onto the tape surface and adversely affect head adhesion and the like. Under these circumstances, as a typical example of a fatty acid amide compound actually used as a lubricant in a magnetic recording medium, for example, stearic acid amide (C ₁₇ H ₃₅ CONH ₂ ) as shown in the above-mentioned publications is mentioned. No. However, in a recent magnetic recording apparatus required for high-density recording, such fatty acid amide compounds did not always provide satisfactory results in durability and characteristics in a low humidity environment. On the other hand, in the present invention, the above 1)
The combination of the above-mentioned fatty acid, the above-mentioned 2) fatty acid ester and the above-mentioned alkanol fatty acid amide as a lubricant has an excellent lubricating effect under a wide range of temperature conditions, has good head adhesion, and stabilizes running durability. It has become possible to provide a high recording density magnetic recording medium having improved electromagnetic conversion characteristics under a low humidity environment. Therefore, the magnetic recording medium of the present invention can sufficiently satisfy the characteristics required for recent magnetic recording media.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
Will be explained. Fatty acids of the above 1) used in the present invention
An aliphatic hydrocarbon group (R in the above formula ¹) Has branches
The carbon number is preferably 12 to 22. Carbon number
Outside of this range, the lubricating effect is reduced, resulting in
Problems such as deterioration of durability occur. Preferred fatty acids
For example, myristic acid, palmitic acid, stearyl
Acid, behenic acid, oleic acid, elaidic acid, linoleic acid
Acids, linolenic acid and the like. In addition, such fatty acids
Uses alkali metal or alkaline earth metal salts
Can be Fatty acids are inherently very adsorbable with pigments
Used when expecting a lubrication effect because it is strong against
It is necessary to increase the amount. However, the use of fatty acids
In this case, the durability of the magnetic recording medium will deteriorate.
This is not preferable because a problem occurs.

The aliphatic hydrocarbon group (R ² in the above formula) of the fatty acid ester of the above 2) used in the present invention preferably has 12 to 22 carbon atoms. If the carbon number is outside this range, the lubricating effect is reduced. In addition, problems such as head adhesion occur. Similarly, the other aliphatic hydrocarbon group (R ³ in the above formula) preferably has 4 to 22 carbon atoms. If the carbon number is out of this range, not only the lubricating effect is reduced, but also problems such as head adhesion are caused. Is generated. In addition, these aliphatic hydrocarbon groups (R ² and R ³ in the above formula) may also have a branch. Preferred fatty acid esters include:
For example, butyl myristate, butyl stearate, oleyl oleate and the like can be mentioned. The aliphatic chain of the fatty acid and / or alcohol in the fatty acid ester may be saturated or unsaturated, and may be of various types such as n- and i-forms. In addition, even if such a fatty acid ester is used alone, an effect on lubrication cannot be expected. If the used amount is increased in expectation of the lubricating effect, problems such as adhesion of the head may occur.

The aliphatic hydrocarbon group (R in the above formula) of the alkanol fatty acid amide of the above 3) used in the present invention may have a branch and has 10 to 22 carbon atoms. Further, n in the above formula is 1 to 5, preferably 1 to 3.
Is an integer. Typical alkanol fatty acid amides represented by the above 3), for example, C ₁₇ H ₃₅ CONHCH ₂ OH methylol stearic acid amide C ₁₁ H ₂₃ CONHCH ₂ OH methylol lauric acid amide _{C 11 H 23 CONHC 3 H 6} OH isopropanol laurate Amide C ₂₁ H ₄₃ CONHCH ₂ OH Methylol behenamide C ₁₇ H ₃₅ CONHC ₂ H ₄ OH Ethyl stearamide.

In the present invention, the fatty acid of the above 1),
By using the fatty acid ester of the above 2) and the alkanol fatty acid amide of the above 3) in combination, it has an excellent lubricating effect under a wide range of temperature conditions, has good head adhesion, has stable running durability, and has a low humidity environment. In this case, the electromagnetic conversion characteristics can be improved, and even if one of the compounds is missing, such an effect cannot be obtained.

The amount of the compound (1) to (3) added to the coating film is 100 parts by weight of the ferromagnetic powder or 1 part by weight of the nonmagnetic powder.
The fatty acid of 1) is preferably 0.1 to 5 parts by weight, more preferably 0.2 to 2 parts by weight, and particularly preferably 0.5 to 1.5 parts by weight with respect to 00 parts by weight. The fatty acid ester of the above 2) is preferably 0.1 to 5 parts by weight, more preferably 0.1 to 5 parts by weight.
It is 2 to 2 parts by weight, especially 0.5 to 1.5 parts by weight. The amount of the aliphatic amide compound of the above 3) is preferably 0.05 to 3 parts by weight, more preferably 0.1 to 1.5 parts by weight, particularly 0.2 to 1.0 parts by weight.

The compounds 1) to 3) can be used in the same manner as the conventional lubricant.
The alkanol fatty acid amide compound of the above 3) has a high melting point, is structurally stable and does not adsorb to the pigment, and thus can be used by kneading the pigment during kneading.

As the binder of the present invention, a thermoplastic resin, a thermosetting resin, or an electron beam-curable resin which has been conventionally used, or a polar group is introduced into a predetermined one of these resins and dispersed therein. A so-called high-dispersion binder having improved properties can be used and is not particularly limited.

As the ferromagnetic powder used in the present invention, a conventionally known magnetic powder can be used, and a magnetic powder having a coercive force and a particle size suitable for a magnetic recording apparatus can be used. However, in order to obtain the characteristics required for a magnetic recording medium in recent years, a ferromagnetic alloy powder containing Fe as a main component has a large coercive force and a large saturation magnetization, and is more effective in medium design.

The non-magnetic powder includes carbon black, graphite, titanium oxide, barium sulfate, Zn
S, MgCO ₃ , ZnO, CaO, γ iron sulfide, W disulfide, Mo disulfide, boron nitride, MgO, SnO ₂ , Si
O ₂ , Cr ₂ O ₃ , α-Al ₂ O ₃ , SiC, cerium oxide, chorantam, artificial diamond, α-iron oxide, garnet, garnet, quartzite, silicon nitride, boron nitride,
Examples include silicon carbide, molybdenum carbide, boron carbide, tungsten carbide, titanium carbide, tripoly, diatomaceous earth, dolomite, and the like.

As the nonmagnetic support used in the present invention, polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN);
Known films such as polyolefins, polyamide, polyimide, polyamide imide, polysulfone cellulose triacetate, and polycarbonate can be used.

In the present invention, a back coat layer may be provided on the non-magnetic support in order to further improve the running stability and further prevent the magnetic layer from being charged.

As other additives used in the present invention, conventionally known additives such as a dispersant, a curing agent and the like can be mentioned, and the production method (dispersion method, coating method, etc.)
Also, a known technique can be used. For example, the magnetic layer paint is applied directly on at least one surface of the non-magnetic support, or after the non-magnetic layer paint is applied on the support, dried, calendered and further cured, Apply to. If necessary, after the nonmagnetic layer coating material is applied on the support, the magnetic layer coating material may be applied while the nonmagnetic layer is wet.
The hardening of the magnetic layer can be performed by any method such as heat hardening or electron beam hardening depending on the type of the binder used.
After the application of the magnetic layer, a curing treatment such as drying, calendering, applying a back coat, drying, heat curing, or electron beam curing is performed according to a general method for manufacturing a magnetic medium.

The thickness of the non-magnetic layer or the magnetic layer may be appropriately determined according to the surface roughness of the non-magnetic support or the required characteristics of the medium, and may be appropriately selected from known thicknesses.

[0024]

The present invention will be described below with reference to specific examples and comparative examples. Examples 1 to 8 and Comparative Examples 1 to 11 In producing a magnetic recording medium having a magnetic layer and a back coat layer having the following compositions, first, a magnetic paint for forming a magnetic layer was formed using the following composition. Was prepared. <Magnetic coating composition for forming magnetic layer> 100 parts by weight of ferromagnetic powder (manufactured by Kanto Denka Kogyo KK, Hc 138 kA / m, σs 136 Am ² / kg, BET specific surface area 54 m ² / g, major axis length 0. 16 μm) 10 parts by weight of vinyl chloride copolymer (manufactured by Zeon Corporation, MR-110, degree of polymerization 300, containing polar group SO ₃ K) 8 parts by weight of polyurethane resin (UR-8300, manufactured by Toyobo Co., Ltd.) α- Al ₂ O ₃ 15 parts by weight (HIT-60A, manufactured by Sumitomo Chemical Co., Ltd., average particle size 0.2 μm) Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Cyclohexanone 40 parts by weight

After sufficiently kneading this composition with a kneader, it was dispersed in a sand grind mill for 5 hours. Then, stearic acid, methylol stearamide,
Butyl stearate was added together with the following solvent in the amount of Example 1 shown in Table 1 below, and further dispersed for 1 hour by a sand grind mill.

Methyl ethyl ketone 30 parts by weight Toluene 30 parts by weight Cyclohexanone 15 parts by weight

To the magnetic paint thus obtained, 3 parts by weight of a curing agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) was added and mixed, and the mixture was further mixed with an average pore diameter of 0.3 μm.
The resulting mixture was filtered through a filter to produce a magnetic paint.

Next, the following coating for forming the back coat layer
Paint for back coat layer formation
Made. <Coating composition for forming back coat layer> Carbon black 100 parts by weight (BP-800, manufactured by Cabot Corporation, average particle diameter 17 nm, BET specific surface area 210 m)^Two/ G) Carbon black 20 parts by weight (manufactured by Cabot Corporation, BP-130, average particle size 75 nm, BET specific surface area 25 m) ^Two / G) 80 parts by weight of nitrocellulose (BTH 1/2, manufactured by Asahi Kasei Kogyo Co., Ltd.) 40 parts by weight of polyurethane resin (N-2304, manufactured by Nippon Polyurethane Industry Co., Ltd.) 150 parts by weight of methyl ethyl ketone 150 parts by weight of toluene 80 parts by weight of cyclohexanone Department

After this composition was sufficiently kneaded in a kneader, it was dispersed in a sand grind mill for 5 hours. Thereafter, the following composition was charged, and the mixture was further dispersed by a sand grind mill for 1 hour.

Methyl ethyl ketone 400 parts by weight Toluene 400 parts by weight Cyclohexanone 200 parts by weight

20 parts by weight of a curing agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) was added to the thus obtained back coat paint, mixed and filtered through a filter having an average pore diameter of 0.5 μm. Thus, a magnetic paint was prepared.

Using the paint for forming a magnetic layer and the paint for forming a back coat layer obtained as described above, a sample of a magnetic recording medium was prepared in the following manner.

First, on a 4.4 μm aramid base support, the paint for forming a magnetic layer was dried to a thickness of 1.
It was applied so as to have a thickness of 5 μm, and a 0.7 T oriented magnet was applied. Thereafter, the coating film was dried.
The calendering process was performed under the conditions of a linear pressure of 2600 N / cm and 3 nips.

On the surface of the support opposite to the surface on which the magnetic layer is to be formed, the coating for forming the back coat layer is applied so as to have a dry thickness of 0.5 μm. Thereafter, the coating film was dried, and then heated to a temperature of 90 ° C. and a linear pressure of 210 ° C.
The calendering process was performed under the conditions of 0 N / cm and 3 nips. The magnetic recording medium film having undergone such a series of processing was wound up on a take-up roll. This was left as it was for 24 hours, and then a thermosetting treatment was performed at 60 ° C. for 24 hours.

The magnetic recording medium film produced in this manner was slit into 3.81 mm width by slitting to produce the magnetic recording medium of Example 1. Magnetic recording media of Examples 2 to 8 and Comparative Examples 1 to 11 were produced in the same manner as in Example 1 except that the type and amount of the lubricant were changed as shown in Tables 1 to 4 below.

Examples 9 to 11 and Comparative Example 12 In producing a magnetic recording medium having a nonmagnetic layer, a magnetic layer and a backcoat layer having the following composition as a multilayer medium, the following composition was used. A paint for forming a non-magnetic layer and a magnetic layer was prepared. <Non-magnetic paint composition for forming non-magnetic layer> 70 parts by weight of α-Fe ₂ O ₃ (manufactured by Toda Kogyo Co., Ltd., major axis length 0.15 μm, BET specific surface area 53 m ² / g) Carbon black R760B 30 parts by weight Part (manufactured by Colombian Chemicals Company, average particle size: 30 nm, BET specific surface area: 63 m ² / g, DBP: 48 cc / 100 g) 10 parts by weight of vinyl chloride copolymer (manufactured by Zeon Corporation, MR-110) 300 polar group containing SO ₃ K) 8 parts by weight of polyurethane resin (UR-8300, manufactured by Toyobo Co., Ltd.) 5 parts by weight of α-Al ₂ O ₃ (HIT-60A, manufactured by Sumitomo Chemical Co., Ltd., average particle size 0.2 μm) methyl ethyl ketone 100 parts by weight toluene 100 parts by weight cyclohexanone 40 parts by weight

After sufficiently kneading this composition with a kneader, dispersion was performed for 5 hours with a sand grind mill. Thereafter, stearic acid, methylol stearamide, and butyl stearate were added together with the following solvents at the addition amounts of Example 9 in Table 2 below, and the mixture was further dispersed by a sand grind mill for 1 hour.

Methyl ethyl ketone 30 parts by weight Toluene 30 parts by weight Cyclohexanone 15 parts by weight

To the magnetic paint thus obtained, 3 parts by weight of a curing agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) was added and mixed, and this was further mixed with an average pore diameter of 0.3 μm.
To prepare a non-magnetic paint.

<Magnetic coating composition for forming magnetic layer> 100 parts by weight of ferromagnetic powder (manufactured by Kanto Denka Kogyo KK, Hc 182 kA / m, σs 150 Am ² / kg, BET specific surface area 50 m ² / g, major axis) Length: 0.1 μm) Vinyl chloride copolymer: 10 parts by weight (manufactured by Zeon Corporation, MR-110; degree of polymerization: 300, polar group containing SO ₃ K) Polyurethane resin: 8 parts by weight (Toyobo Co., Ltd., UR-8300) ) Α-Al ₂ O ₃ 10 parts by weight (HIT-60A, manufactured by Sumitomo Chemical Co., Ltd., average particle size 0.2 μm) Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Cyclohexanone 40 parts by weight

After sufficiently kneading the composition with a kneader, the mixture was dispersed in a sand grind mill for 5 hours. Thereafter, stearic acid, methylol stearic acid amide, and butyl stearate were added together with the following solvents at the added amounts of Example 9 in Table 2 below, and the mixture was further dispersed for 1 hour by a sand grind mill.

Methyl ethyl ketone 180 parts by weight Toluene 150 parts by weight Cyclohexanone 150 parts by weight

To the magnetic paint thus obtained, 3 parts by weight of a curing agent (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) was added and mixed, and this was further mixed with an average pore diameter of 0.3 μm.
The resulting mixture was filtered through a filter to produce a magnetic paint.

Using the coating material for forming a nonmagnetic layer and the coating material for forming a magnetic layer thus obtained, a sample of the magnetic recording medium of Example 9 was produced in the following manner.

First, on the aramid base support having a thickness of 4.4 μm, the above-mentioned coating material for forming a non-magnetic layer is applied so as to have a dry thickness of 1.4 μm. Then, at a temperature of 100 ° C. and a linear pressure of 2600 N / cm,
The calendering process was performed under the nip condition. Thereafter, a thermosetting treatment was performed at 40 ° C. for 48 hours. The magnetic layer is coated on the non-magnetic layer thus formed so as to have a dry thickness of 0.15 μm, a 0.7 T oriented magnet is applied, and then the coating film is dried. , Temperature 10
The calendering treatment was performed under the conditions of 0 ° C., a linear pressure of 2600 N / cm, and three nips.

On the surface of the support thus formed opposite to the surface on which the magnetic layer was formed, the same paint for forming a back coat layer as in Example 1 described above having a dry thickness of 0.5 μm. Then, the coating film was dried, and then subjected to a calendering treatment under the conditions of a temperature of 90 ° C., a linear pressure of 2100 N / cm, and three nips. The magnetic recording medium film having undergone such a series of processing was wound up on a take-up roll. This was left as it was for 24 hours, and then a thermosetting treatment was performed at 60 ° C. for 24 hours.

The magnetic recording medium film produced in this manner was slit into 3.81 mm width pieces by slitting to produce a tape-shaped magnetic recording medium of Example 9. Magnetic recording media of Examples 10 and 11 and Comparative Example 12 were produced in the same manner as in Example 9 except that the type and amount of the lubricant were changed as shown in Tables 2 and 4.

The following evaluations were performed on the magnetic recording media of each of the examples and the comparative examples produced as described above. Evaluation method (1) Durability 3.81mm format HP data drive C
At 1599A, the durability of the tape was evaluated and the adhesion of the head after the durability was observed. The durability is a part of the tape (100
MByte) by the method of Write / Read
Performed 0 times. Durability: 30 ° C 80% RH, 45 ° C 20
% RH, 5 ° C, 80% RH in each environment.

1-1. The evaluation criteria for durability are as follows. ◎ When there is no increase in the error rate and the vehicle has run 2000 times ○ There is an increase in the error rate but when it has run 2000 times △ When it stops at 1500 to 2000 times × When it stops without being able to run 1500 times (In this case, No observation of head adhesion was made.)

1-2. Head adhesion The head after durability running was observed with a microscope manufactured by KEYENCE CORPORATION to evaluate head contamination. The evaluation criteria for head adhesion are as follows. ○ When there is no adhesion on the head sliding surface △ When there is an adhesion on the head sliding surface

(2) Output Deterioration In a constant temperature bath set in an environment of 45 ° C. and 20% RH,
Using a 3.81 mm format Seagate data drive STD224000N, a part (about 10 m) of the tape is written / read 100 times, and the RF output signal (recording wavelength 0.67 μm) at that time is recorded on a recorder. 10 for the output at the beginning of Read
The amount of decrease in output at the beginning of the 0th Read was read from the recorder, and was determined as output deterioration (dB). The obtained results are shown in Tables 1 to 4 below.

[0052]

[Table 1]

[0053]

[Table 2]

[0054]

[Table 3]

[0055]

[Table 4]

[0056]

As described above, according to the present invention, it is possible to obtain a high recording which has an excellent lubricating effect under a wide range of temperature conditions, has good head adhesion, and can stably obtain running durability. A high density magnetic recording medium can be provided.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazushi Tanaka 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation F term (reference) 4J038 EA011 HA016 HA026 HA036 HA066 HA076 HA206 HA216 HA266 HA316 HA356 HA376 HA446 HA556 JA38 JA56 JB13 KA07 KA20 NA11 NA22 PB11 PC02 5D006 BA09 CA04 FA02 FA05

Claims (2)

[Claims] 1. A magnetic layer comprising a ferromagnetic powder and a binder as a main component as a single layer or a non-magnetic powder comprising a nonmagnetic powder and a binder as a main component on at least one surface of a nonmagnetic support. In a magnetic recording medium provided as a multilayer with a magnetic layer interposed therebetween, the magnetic layer and / or the non-magnetic layer may include: 1) a general formula, R ¹ COOH (wherein, R ¹ has 12 to 2 carbon atoms;
At least one fatty acid compound represented by the formula: R ² COOR ³ (wherein R ² has 12 to 12 carbon atoms).
22) a saturated or unsaturated aliphatic hydrocarbon group, R ³ represents a saturated or unsaturated aliphatic hydrocarbon group having 4 to 22 carbon atoms), and at least one fatty acid ester compound represented by the formula: At least represented by the general formula, RCONHC _n H _{(2 × n)} OH (wherein, R represents a saturated or unsaturated aliphatic hydrocarbon group having 10 to 22 carbon atoms, and n represents an integer of 1 to 5). 1
And at least one alkanol fatty acid amide compound. 2. The fatty acid compound of 1) is 0.1 to 5 parts by weight, and the fatty acid ester compound of 2) is 0.1 to 100 parts by weight of the ferromagnetic powder or 100 parts by weight of the nonmagnetic powder. 2. The magnetic recording medium according to claim 1, wherein the alkanol fatty acid amide compound of 3) is 0.05 to 3 parts by weight.