JPH09111279A - Lubricant and magnetic recording medium using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic recording medium, capable of maintaining excellent lubricity and sustaining lubricating effects over a long period and excellent in runnability, abrasion resistance, durability, etc. SOLUTION: This lubricant is produced by adding a long-chain amine-based compound represented by formula 3 to a perfluoropolyethereal compound, represented by formula 1 or 2 and having hydroxyl group and along-chain hydrocarbon group in the molecule. A magnetic recording medium is obtained by applying or internally adding the lubricant to a magnetic layer. (formula 1) Rf R1 XR2 YR, (formula 2) RYR2 XR1 Rf R1 XR2 YR (Rf denotes a perfluoropolyether; R denotes a hydrocarbon; R2 denotes a hydrocarbon chain; R1 denites a hydrocarbon having hydroxyl group; X and Y denote each an atom or an atomic group) and (formula 3) R3 NR4 R5 (any one of R3 , R4 and R5 denotes a >=10C hydrocarbon, a hydrocarbon containing fluorine or a perfluoropolyether group).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant applied to a magnetic recording medium such as a magnetic tape and a magnetic disk, and a magnetic recording medium using the lubricant.

[0002]

2. Description of the Related Art In a so-called metal thin film type magnetic recording medium in which a ferromagnetic metal material is deposited on a non-magnetic support by a method such as vapor deposition and used as a magnetic layer, the smoothness of the magnetic layer surface is very good. Therefore, a substantial contact area with a sliding member such as a magnetic head or a guide roller is large, and thus a friction coefficient is large, and an adhesion phenomenon (so-called sticking) is likely to occur, resulting in problems such as lack of running property and durability. Many.

For example, a magnetic tape inserted in an 8 mm video deck is wound around a drum through 10 or more guide pins. At that time, the tape tension and the tape running speed were kept constant by the pinch roller and the capstan, the tension was about 20 g and the running speed was 0.
5 cm / s. In this running system, the magnetic layer of the tape is in contact with a stainless guide pin that is fixed. Therefore, when the friction on the surface of the tape becomes large, the tape causes a stick-slip, a phenomenon called so-called tape squeaking occurs, and the playback screen becomes tight. Further, the relative speed between the tape and the head is very large, and particularly in the paused state, high-speed contact occurs at the same place, which causes a problem of wear of the magnetic layer, which leads to a reduction in reproduction output. In the case of vapor-deposited tape, the magnetic layer is so thin that this problem becomes more serious.

In a CSS (contact start stop) type hard disk device, the magnetic head is in contact with the magnetic disk before the rotation, and is levitated by the air flow generated when the magnetic head is rotated at a high speed. Therefore, the medium travels by rubbing the medium at the time of start-stop or start-up, and the increase in friction at that time is a serious problem. In order to maintain the product level reliability, it is desired that the friction coefficient after performing the CSS operation 20,000 times is 0.5 or less. Further, since it is rotating at a high speed, the problem of so-called head crash due to the magnetic head and the magnetic recording medium, that is, the magnetic disk is one of the problems in the thin film magnetic recording medium.

Therefore, it has been studied to use various kinds of lubricants in order to solve these problems, and conventionally, a lubricant such as a higher fatty acid or its ester is top-coated on the magnetic layer of the magnetic recording medium. Has attempted to suppress the increase in friction coefficient.

By the way, the lubricant used in the magnetic recording medium is required to have very strict characteristics, and it is difficult to cope with the conventional lubricant. That is, the lubricant used for the magnetic recording medium is (1) excellent in low temperature characteristics so as to ensure a predetermined lubricating effect when used in cold regions, and (2) spacing with a magnetic head. Is a problem because it can be applied very thinly, sufficient lubrication characteristics can be exhibited even in that case, and (3) it can withstand long-term use, and can maintain lubricity for a long period of time. Persistence, etc. are required.

The most important solution for solving these problems of increasing the coefficient of friction or durability is to study the lubricant applied to the surface of the magnetic recording medium. A few nm are required for good lubrication performance with a magnetic head, uniform and strong adhesion to a magnetic recording medium such as a magnetic tape or a magnetic disk surface, and long-term (for 10 years) retention of these performances.
In order to achieve a film thickness on the order of almost a monomolecular level, it is necessary to study a lubricant.

It is known that the lubrication characteristics depend on the molecular structure of the lubricant, and those developed especially for magnetic recording media are roughly classified into three types. Silicon type, hydrocarbon type, and fluorinated carbon type.

The silicon-based lubricant is one of the lubricants often used in the coating medium because of its good thermal stability and low vapor pressure. However, it does not have a very good lubrication performance on the thin film type magnetic recording medium with a very good surface property like the present, and the lubrication characteristics in the accelerated wear test of the pin-on disk or the CSS test satisfy the durability specifications. do not do.
That is, silicon-based lubricants are extremely limited in forming an oriented lubricating film on the surface of a thin-film magnetic recording medium, which is currently mainstream, and satisfying required lubricating characteristics.

[0010] Hydrocarbon-based lubricants are still the mainstream lubricants in coating type magnetic recording media. However, in terms of thermal or chemical stability, hydrocarbon-based lubricants are generally inferior to silicon-based or fluorine-based lubricants, and frictional polymers formed by the reaction of molecules by friction, It is easy to produce in systems using hydrocarbon-based lubricants. This polymer degrades the lubricating properties, sometimes resulting in catastrophic failure. The high vapor pressure is one of the drawbacks of hydrocarbon lubricants. Since the thin film magnetic recording medium cannot replenish the lubricant, it exhibits excellent friction characteristics, but it is difficult to be used for an actual thin film magnetic recording medium because of its high vapor pressure.

Fluorine-based lubricants are currently the most widely used lubricants in thin film magnetic recording media. Among the fluorinated lubricants, perfluoropolyether-based compounds are widely used because they have better lubricating performance and surface protection action than other fluorinated lubricants. And a molecular weight at the same time has a low viscosity for CF ₂ -O-CF ₂ ether bond is flexible for this reason, can be mentioned that the viscosity in a wide temperature range does not change. In addition, it is chemically inert, low vapor pressure, high thermal or chemical stability, low surface energy, good boundary lubrication properties, and good water repellency. To be

The properties of perfluoropolyether compounds are very strongly dependent on their molecular structure. Several kinds of perfluoropolyether compounds are commercially available, and they have different molecular weights, repeating units of the main chain, and terminal groups. For example, Fomblin-Y (manufactured by Ausimont)
The type is a random polymer of CF (CF ₃ ) CF ₂ O and CF ₂ O, and the repeating unit of the main chain has a branched structure, whereas the Fomblin-Z type is CF ₂ CF ₂
It is a polymer of O and CF ₂ O and has a linear structure. Demnum
The type (manufactured by Daikin Industries, Ltd.) and the type Krytox (manufactured by DuPont) are homopolymers of hexafluoropropylene oxide and hexafluoroisopropylene oxide, respectively. Due to their chemical inertness, perfluoropolyethers lack the ability to adsorb on the surface of magnetic media. Therefore, in order to improve the adsorptive power, a perfluoropolyether compound having a polar group at both ends, Fomb
lin-Z-DOL (hydroxyl group) and Fomblin AM2
001 (propenyl group) was developed. Fomblin
AM2001 has a very strong immobilizing effect particularly on a metal surface or a carbon surface, and by introducing a polar group at the end, the friction coefficient decreases and the service life of the magnetic disk increases. As described above, there are very strict demands on the lubricant for the thin film magnetic recording medium, and various devises have been made, but there is no lubricant yet that satisfies the required characteristics.

In a magnetic recording system having a relative velocity exceeding several m / s, the frictional heat generated at the contact portion causes the surface temperature to increase suddenly, though instantaneously. Although there is no accurate method for measuring the temperature at the contact point between the head and the medium,
It is estimated that the temperature will exceed several hundred degrees Celsius by calculation. Particularly under such boundary lubrication conditions, since a reactive surface appears, the temperature at such a contact point accelerates the decomposition reaction of the lubricant molecules.

Although perfluoropolyether is stable in air at temperatures of 350 ° C. or higher, metal alloys such as iron and titanium alloys or Lewis acids and Lewis bases such as AlCl ₃ , FeF ₃ and Al ₂ O _{3 are used.} It becomes easy to decompose in the presence of.

The decomposition of such a lubricant adversely affects the lubrication characteristics, which in turn results in a loss of reliability of the magnetic recording system. Therefore, it is necessary to develop not only lubricating characteristics, but also lubricants with less decomposition. In addition, perfluoropolyethers are not only soluble in CFCs, but are also a problem for the global environment.

As described above, the properties required of the lubricant are extremely strict, and the reliability of the magnetic recording medium cannot be completely satisfied even if it has thermal or chemical stability or adsorption to the medium surface. is the current situation.

[0017]

As described above, in the field of magnetic recording media, practical properties such as running property and durability are unsatisfactory due to lack of ability of the lubricant and protective film used. Is left.

Therefore, the present invention provides a magnetic recording medium which has excellent lubricity under various conditions of use, has a long-lasting lubrication effect, and is excellent in running property, abrasion resistance, durability and the like. It is intended to be provided.
Specifically, as a result of molecular design of lubricants that take advantage of the advantages of fluorine-based lubricants, hydrocarbon-based lubricants, and polar groups, perfluoropolycarbons having hydroxyl groups and long-chain hydrocarbons in the molecule The purpose is achieved by adding a long-chain amine compound to a lubricant composed of an ether compound.

[0019]

The present invention provides the following general formula 1
Alternatively, a lubricant obtained by adding a long-chain amine compound represented by the general formula 3 to a perfluoropolyether compound having a hydroxyl group and a long-chain hydrocarbon group in the molecule represented by the general formula 2 It is a magnetic recording medium coated or internally added on a magnetic layer. (General Formula 1) R _f R ₁ XR ₂ YR (General Formula 2) RYR ₂ XR ₁ R _f R ₁ XR ₂ YR where R _f represents a perfluoropolyether, R is a hydrocarbon, and R ₂ is a hydrocarbon. A chain, R ₁ is a hydrocarbon having a hydroxyl group, and X and Y are atoms or atomic groups. (General Formula 3) R ₃ NR ₄ R ₅ However, any one of R ₃ , R ₄ and R ₅ has 10 carbon atoms.
The above hydrocarbons, hydrocarbons containing fluorine, and perfluoropolyether groups are shown.

In the present invention, as described above, a lubricant prepared by adding a long-chain amine compound to a perfluoropolyether compound having a hydroxyl group and a long-chain hydrocarbon in the molecule is coated on or in the magnetic layer. The magnetic recording medium internally added to the above can exhibit a good lubricating effect, and is compared with the case where a commercially available perfluoropolyether compound is used as a lubricant or the case where a long chain amine compound is not added. Thus, durability such as friction coefficient, still durability, shuttle durability, etc. can be improved. Further, this lubricating action is not impaired even under severe conditions such as low temperature, and the lubricity can be maintained for a long time. In addition, its properties show good lubricating properties regardless of the molecular structure of perfluoropolyether. Further, even though it is a perfluoropolyether compound, the introduction of a hydrocarbon group results in dissolution in a hydrocarbon solvent such as toluene or hexane, and its lubricating property does not depend on the solvent.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The lubricant according to the present invention is a compound represented by the general formula 3 with respect to a perfluoropolyether compound having a hydroxyl group and a long-chain hydrocarbon group in the molecule represented by the following general formula 1 or formula 2. A lubricant obtained by adding a long-chain amine compound represented by

The magnetic recording medium according to the present invention has a hydroxyl group and a long-chain hydrocarbon group in the molecule represented by the following general formula 1 or general formula 2 on the magnetic layer formed on the non-magnetic support. A lubricant obtained by adding a long-chain amine compound represented by the general formula 3 to a perfluoropolyether compound is applied or internally added.

(General Formula 1) R _f R ₁ XR ₂ YR (General Formula 2) RYR ₂ XR ₁ R _f R ₁ XR ₂ YR where R _f represents a perfluoropolyether, R represents a hydrocarbon, and R ₂ Is a hydrocarbon chain, R ₁ is a hydrocarbon having a hydroxyl group, and X and Y are atoms or atomic groups. (General Formula 3) R ₃ NR ₄ R ₅ However, any one of R ₃ , R ₄ and R ₅ has 10 carbon atoms.
The above hydrocarbons, hydrocarbons containing fluorine, and perfluoropolyether groups are shown.

That is, the magnetic recording medium of the present invention has a long-chain amine relative to a perfluoropolyether compound having at least a magnetic layer on a non-magnetic support and having a hydroxyl group and a long-chain hydrocarbon group in the molecule. A lubricant formed by adding a system compound is applied or internally added.

The present invention provides good durability even when a thin film magnetic recording medium such as a vapor deposition tape is used under severe conditions such as high temperature and high humidity or low temperature and low humidity, and its characteristics are deteriorated. It does not. The film thickness of this lubricant is 5 nm to 50 nm. This is because if it exceeds 50 nm, deterioration of electromagnetic conversion characteristics becomes a problem, and if it is less than 5 nm, durability becomes insufficient.

As the magnetic recording medium to which the present invention is applied, a so-called metal thin film type magnetic recording medium in which a magnetic layer is formed on the surface of a non-magnetic support by a method such as vapor deposition,
Alternatively, it can be applied to a coating type magnetic recording medium in which a magnetic layer is dissolved in a solvent together with a binder (binder) or an additive and the like is coated on a non-magnetic support substrate.

Further, these magnetic recording media can also be applied to magnetic recording media having a structure in which an underlayer is interposed between a non-magnetic support and a magnetic layer.

The non-magnetic support and magnetic layer of the magnetic recording medium are
It is not limited in any way, and any conventionally known one can be used. For example, as the non-magnetic support, polyethylene terephthalate similar to the coating type magnetic recording medium can be used. in this case,
When a rigid substrate such as an Al alloy plate or a glass plate is used as the non-magnetic support, an oxide film such as alumite treatment or a Ni-P film is formed on the substrate surface to harden the surface. May be.

The metal magnetic thin film as the magnetic layer is formed as a continuous film by PVD (Physical Vapor Deposition) method such as plating, sputtering and vacuum deposition.
e, Co, Ni and other metals, Co-Ni alloys, Co-P
t-based alloy, Co-Pt-Ni-based alloy, Fe-Co-based alloy, Fe-Ni-based alloy, Fe-Co-Ni-based alloy, Fe
-Ni-B system alloy, Fe-Co-B system alloy, Fe-Co
Examples are an in-plane magnetization recording metal magnetic film and a Co—Cr alloy thin film made of —Ni—B alloy.

Particularly, in the case of in-plane magnetization recording metal magnetic thin film,
Bi, Sb, Pb, Sn, Ga, on the non-magnetic support in advance
An underlayer of a low-melting point non-magnetic material such as In, Ge, Si, or Ti is formed, and a metal magnetic material is vapor-deposited or sputtered from the vertical direction to diffuse the low-melting point non-magnetic material in the metal magnetic thin film The orientation may be eliminated to secure the in-plane isotropic property, and the anti-magnetism may be improved.

As the magnetic powder used in the coating type, any magnetic powder that is usually used as the magnetic powder of this type of magnetic recording medium can be used. By way of example, ferromagnetic iron oxide particles, ferromagnetic CrO _2, ferromagnetic cobalt ferrite _{(CoO-Fe 2 O 3)} , cobalt sorbent-oxide, ferromagnetic Fe-Co-Ni-based alloy, hexagonal tetragonal barium ferrite, Examples thereof include fine particles of iron nitride. In the case of ferromagnetic iron oxide fine particles, when expressed by the general formula FeO _x , the value of X is in the range of 1.33 <X <1.51, that is, magnetematite (γ-Fe ₂ O ₃ , X
= 1.5), magnetite (Fe ₃ O ₄ , X = 4/3)
And solid solutions thereof. Further, cobalt may be added to these ferromagnetic iron oxides for the purpose of increasing the coercive force.

As the above-mentioned ferromagnetic chromium dioxide, CrO is used.
₂ or for the purpose of improving coercive force, Ru, Sn,
It is possible to use a material obtained by adding at least one kind of Te, Sb, Fe, Ti, V, Mn and the like to CrO ₂ .
As the ferromagnetic alloy powder, Fe alloy powder, Co alloy powder, Ni alloy powder, and Fe-Co, Fe-Ni,
Fe-Co-Ni, Co-Ni, Fe-Co-B, Fe
-Co-Cr-B, Mn-Bi, Mn-Al, Fe-C
Alloy powders such as o-V or alloy powders that are compounds of these alloys and other elements can be used.

As a method of retaining a lubricant on it
The most common method is to use a metal magnetic thin film surface or
Similarly, dip coat a lubricant layer on the protective film surface.
Method. In this case, the amount of lubricant applied
Is 0.5 to 100 mg / m ^TwoIs desirable,
1-20 mg / m^TwoIs more preferable. this
Is 1 mg / m^TwoLess than 0.5 mg / m^TwoLess than
20 mg / m due to durability issues^TwoEspecially when
100mg / m^TwoDrive exceeds the drive system of the magnetic recording medium.
The problem of "sticking" with the sliding parts in the system occurs
Will be.

In the case of a coating medium in which a magnetic coating material prepared by kneading and diluting magnetic powder with a polymer as a binder and a solvent is applied to a non-magnetic support, a lubricant is internally added to the magnetic layer. There is also.

The necessary conditions for a perfluoropolyether compound having a hydroxyl group in the molecule and a long-chain hydrocarbon are (1) having a perfluoropolyether group, and (2) having a hydroxyl group in the molecule. (3) When solubility is taken into consideration, it may also have a long-chain hydrocarbon group. (However, (3) is not a necessary condition from the viewpoint of lubrication characteristics.)

The long-chain hydrocarbon-perfluoropolyether linking group, that is, X and Y in the general formula 1 or 2 is not particularly specified. An example of using a perfluoropolyether compound having a hydroxyl group in the molecule and also having a long-chain hydrocarbon as a lubricant is, for example, Japanese Patent Application No. 7-130629, which is an application of the present applicant. The magnetic recording medium used is "there is a magnetic recording medium used in the present invention, and the characteristics of the present invention are further improved by adding a long-chain amine compound to the magnetic recording medium.

The molecular structure of perfluoropolyether includes monofunctional perfluoropolyether and polyfunctional perfluoropolyether, and the monofunctional perfluoropolyether has, for example, a perfluoropropyloxy group. F (CF ₂ CF ₂ CF ₂ O) _n
Or a copolymer of perfluoropropyloxy group and perfluorooxymethylene group

[0038] Or having a perfluoroisopropyloxy group, Etc. The polyfunctional perfluoropolyether is, for example, a copolymer of a perfluorooxyethylene group and a perfluorooxymethylene group, (OC
₂ F ₄ ) _p (OCF ₂ ) _{q and the} like. Here, in the chemical structural formula of the perfluoropolyether, L, m, n,
k, p, and q are integers of 1 or more. The molecular weight is not particularly limited, but is preferably about 600 to 5000. If the molecular weight is too large, the effects of long-chain hydrocarbons and hydroxyl groups will be small, and if it is too small, the effects of perfluoropolyether groups will be weakened. Further, in the case of polyfunctionality, the ratio of p and q is preferably between 0.5 and 2.

As the long-chain amine compound added to the above-mentioned perfluoropolyether compound, one of R ₃ , R ₄ , and R ₅ is a hydrocarbon having 10 or more carbon atoms, as shown in the general formula 3. It shows a hydrocarbon containing fluorine and a perfluoropolyether group. Other substituents are not particularly limited. When the carbon number is small, the lubricating effect, especially the effect on the friction characteristics is small.

The amount of the long-chain amine compound added is not particularly limited, but the amine compound is preferably about 5% by weight to 200% by weight with respect to the perfluoropolyether compound.

These lubricants are coated or internally added on the magnetic recording medium, and conventionally known lubricants such as long-chain carboxylic acids generally used in magnetic recording media,
Alternatively, they may be used in combination with their esters and long-chain alcohols.

Further, an extreme pressure agent may be used in combination at a weight ratio of about 30:70 to 70:30 in order to cope with more severe conditions and maintain the lubricating effect. The extreme pressure agent reacts with the metal surface by the frictional heat accompanying the partial metal contact in the boundary lubrication region, and forms a reaction product film to prevent friction and wear. , Phosphorus-based extreme pressure agents, sulfur-based extreme pressure agents, halogen-based extreme pressure agents, organometallic extreme pressure agents. Any compound type extreme pressure agent or the like can be used.

In addition to the above-mentioned lubricant and extreme pressure agent, a rust preventive agent may be used in combination if necessary. As the rust preventive, any rust preventive commonly used as a rust preventive for magnetic recording media of this type can be used, and examples thereof include phenols, naphthols, quinones, nitrogen atom-containing heterocyclic compounds, and oxygen atoms. There are heterocyclic compounds and the like.

Further, in the above-mentioned metal thin film type magnetic recording medium, in addition to the metal magnetic thin film which is the magnetic layer, an undercoat layer or the like may be formed under the back coat layer or the magnetic film if necessary. Good.

[0045]

EXAMPLES Hereinafter, specific examples of the present invention will be described, but it goes without saying that the present invention is not limited to these examples. The magnetic recording media shown below were prepared using the samples shown in Table 1 below and the amine compounds shown in Table 2. An example applied to a metal thin film type magnetic recording medium (vapor deposition tape) will be described.

Example 1 Co was deposited on a non-magnetic support of a polyethylene terephthalate film having a thickness of 14 μm by the oblique vapor deposition method to form a ferromagnetic metal thin film having a thickness of 200 nm. Next, using a sample 1 in Table 1 as a perfluoropolyether compound, a lubricant obtained by adding 30% by weight of the compound 1 in Table 2 as an amine compound thereto (Lubricant 1 in Table 3). Was dissolved in a toluene solvent and applied so that the applied amount would be 5 mg / m ^2, and cut into 8 mm width to prepare a sample tape.

[Example 2] A sample tape is prepared in the same manner as in Example 1, but these Examples 2-1 are used.
In No. 6, samples 1 to 13 and 1 to 8 shown in Table 1 and Table 2 were used in combination as perfluoropolyether compounds.

Table 3 shows combinations of perfluoropolyether compounds and amine compounds in Examples 1 to 16. A 1: 1 mixed solvent of toluene and hexane was used as the solvent.

[0049]

[Table 1]

[0050]

[Table 2]

[0051]

[Table 3]

With respect to each of the sample tapes produced as described above, the friction coefficient, the still and the temperature at a temperature of 25 ° C. and a relative humidity of 60%, a temperature of −5 ° C., and a temperature of 40 ° C. and a relative humidity of 80%. The shuttle durability was measured. For still durability, the decay time until the output decreased by 3 dB in the paused state was evaluated. Shuttle endurance is 3 dB each time the shuttle runs for 2 minutes
It was evaluated by the number of shuttles until it decreased. The results are shown in Tables 4 and 5.

[0053]

[Table 4]

[0054]

[Table 5]

Comparative Example 1 Sample 1 was used as Comparative Example 1.
A sample tape was prepared in the same manner as in Example 1 when using only the perfluoropolyether compound (Comparative Example 1 in Table 7), that is, when the amine compound was not added. [Comparative Examples 2 to 7] Using Samples 2 to 7, sample tapes were produced by the same method as in Example 1 except that the amine compound was not added. [Comparative Example 8] A sample tape was prepared in the same manner as in Example 1, except that a blank tape containing no lubricant was used. [Comparative Examples 9 to 11] Samples 14 to 16 in the following Table 6 made of commercially available perfluoropolyether-based compounds were used, but the amine-based compound was not added, and other samples were prepared in the same manner as in Example 1. A tape was made.

[0056]

[Table 6]

[0057]

[Table 7]

With respect to each of the sample tapes produced as described above, the friction coefficient, the still and the temperature under the conditions of a temperature of 25 ° C. and a relative humidity of 60%, a temperature of −5 ° C. and a temperature of 40 ° C. and a relative humidity of 80%. The shuttle durability was measured. For still durability, the decay time until the output decreased by 3 dB in the paused state was evaluated. Shuttle endurance is 3 dB each time the shuttle runs for 2 minutes
It was evaluated by the number of shuttles until it decreased. The results are shown in Tables 8 and 9.

[0059]

[Table 8]

[0060]

[Table 9]

As is clear from Tables 4 and 5 and Tables 8 and 9, long-chain amine compounds were added to perfluoropolyether compounds having hydroxyl groups and long-chain hydrocarbon groups in the molecule on the magnetic layer. The lubricant according to the present invention, which is added, contains the above-mentioned perfluoropolyether compound alone as a lubricant, or a commercially available lubricant containing a perfluoropolyether compound, that is, a long-chain amine-based compound. Compared to the case where no compound is added, the durability such as friction coefficient, still durability, shuttle durability, etc.
Very good results were obtained under various conditions. In addition, it shows excellent results with almost no deterioration due to aging.

[0062]

As is apparent from the above, the present invention provides a newly developed lubrication system in which a long-chain amine compound is added to a perfluoropolyether compound having a hydroxyl group and a long-chain hydrocarbon group in the molecule. The magnetic recording medium coated with or internally added as an agent can maintain the lubricity under any condition and can maintain the lubricity for a long period of time.

Regarding the characteristics, good lubricating characteristics are exhibited regardless of the molecular structure of perfluoropolyether.

Therefore, the magnetic recording medium of the present invention is excellent in running property, abrasion resistance and durability.

As a result of introducing a hydrocarbon group, even though it is a perfluoropolyether compound, it dissolves in a hydrocarbon solvent such as toluene or hexane, and its lubricating property does not depend on the solvent.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C10M 107: 38 107: 44 133: 06 149: 14) C10N 40:18 50:08

Claims (2)

[Claims] 1. A long-chain amine compound represented by the general formula 3 is substituted for a perfluoropolyether compound having a hydroxyl group and a long-chain hydrocarbon group in the molecule represented by the following general formula 1 or formula 2. A lubricant characterized by being added and manufactured. (General Formula 1) R _f R ₁ XR ₂ YR (General Formula 2) RYR ₂ XR ₁ R _f R ₁ XR ₂ YR where R _f represents a perfluoropolyether, R is a hydrocarbon, and R ₂ is a hydrocarbon. A chain, R ₁ is a hydrocarbon having a hydroxyl group, and X and Y are atoms or atomic groups. (General Formula 3) R ₃ NR ₄ R ₅ However, any one of R ₃ , R ₄ and R ₅ has 10 carbon atoms.
The above hydrocarbons, hydrocarbons containing fluorine, and perfluoropolyether groups are shown. 2. A magnetic recording medium comprising at least a magnetic layer on a non-magnetic support, and a perfluoro having a hydroxyl group and a long-chain hydrocarbon group in the molecule represented by the following general formula 1 or general formula 2. A magnetic material, characterized in that a lubricant produced by adding a long-chain amine compound represented by the general formula 3 to a polyether compound is coated on the magnetic layer or internally added to the magnetic layer. recoding media. (General Formula 1) R _f R ₁ XR ₂ YR (General Formula 2) RYR ₂ XR ₁ R _f R ₁ XR ₂ YR where R _f represents a perfluoropolyether, R is a hydrocarbon, and R ₂ is a hydrocarbon. A chain, R ₁ is a hydrocarbon having a hydroxyl group, and X and Y are atoms or atomic groups. (General Formula 3) R ₃ NR ₄ R ₅ However, any one of R ₃ , R ₄ and R ₅ has 10 carbon atoms.
The above hydrocarbons, hydrocarbons containing fluorine, and perfluoropolyether groups are shown.