JP2885205B2 - Lubricant for magnetic recording medium, magnetic recording medium and magnetic recording apparatus using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant for a magnetic recording medium comprising a perfluoropolyether compound (hereinafter, simply referred to as "lubricant"), and a magnetic recording medium and a magnetic recording apparatus using the same. Things.

[0002]

2. Description of the Related Art In recent years, in a hard disk drive,
As the demand for miniaturization of the entire apparatus and increase in recording capacity becomes remarkable, technical development aiming at higher recording density is being promoted. In the head / disk system, a higher recording density is achieved by shortening the distance between the head and the disk or rotating the disk at a higher speed. As a result, the probability of high-speed contact between the slider on which the head is mounted and the disk is increased, and as a result, the problem that the lubricant deteriorates and various obstacles are induced has become apparent.

As a result of a study by the inventors, it has been found that the deterioration modes of the lubricant are roughly classified into the following two modes. One is the decomposition of the perfluoropolyether, which is a lubricant molecule, and the other is the production of a highly viscous substance.

When the perfluoropolyether decomposes,
The lubricating effect is reduced, and the wear speed of the medium protective layer due to high-speed contact with the slider increases, leading to a head crash. As a means to maintain the lubrication effect for a long time,
There are many known examples of a lubricant provided with a mechanism for suppressing the decomposition of perfluoropolyether. For example,
Regarding those obtained by adding an alkylamine to perfluoropolyether, JP-A-5-20675, JP-A-6-145687, JP-A-7-62378, JP-A-7-93744, and JP-A-7-93744 disclose. 9374
No. 5 publication. Of these, for example, JP-A-7-93744 relates to a lubricant obtained by adding a long-chain alkylamine to perfluoropolyether. The alkylamine may be linear or branched, and preferably has 6 or more carbon atoms. It is said that this lubricant can exhibit excellent lubricating properties over a long period of time, and has good running properties, abrasion resistance and durability, and can have high performance. As long as such lubricants are used for magnetic tapes such as audio tapes and video tapes,
The inventors have also confirmed that the decomposition of perfluoropolyether is sufficiently suppressed, and high performance such as running performance can be achieved.

[0005]

However, in recent hard disk drives, the disk rotation speed is 5400 r.
pm, or even higher. Under such severe conditions, decomposition of perfluoropolyether cannot be suppressed in the known examples including the above-mentioned examples, and therefore, a decrease in lubrication performance cannot be prevented.

According to the studies made by the inventor, it is considered that a lubricant obtained by adding an alkylamine to a perfluoropolyether having a hydroxyl group at a terminal can exert lubricating properties over a long period of time by the following action. In other words, an acidic substance (mainly an organic carboxylic acid) which is formed in the lubricant by sliding and serves as a catalyst for the decomposition reaction of perfluoropolyether
Is neutralized by an alkylamine to eliminate its catalytic action.

However, in a hard disk medium, an acidic substance (mainly hydrofluoric acid) generated by sliding is different from that of a magnetic tape, so that it cannot be sufficiently neutralized with an alkylamine, and its concentration is also low. Because of the hundreds to tens of thousands of times that of a magnetic tape, sufficient neutralization could not be performed. There has been no known example of a truly effective means for suppressing the decomposition of perfluoropolyether under such conditions.

Further, the generation of a highly viscous substance due to deterioration of the lubricant is more serious as a cause of failure of the head / disk system. This highly viscous substance is a modified lubricant mainly composed of a complex compound of a decomposition product of perfluoropolyether and a metal ion. When this highly viscous substance adheres to the slider, its aerodynamic characteristics change, and the flying attitude of the slider, such as the flying height variation, pitch angle and roll angle variation, changes. As a result, an increase in the error rate during recording and reproduction, an increase in the probability of high-speed contact between the slider and the disk, a high-speed sliding between the slider edge portion and the disk, etc. occur, and the possibility of a head crash in a short time increases. In order to avoid such a problem, it is extremely effective to use a lubricant that does not generate a highly viscous substance even by high-speed contact between the slider and the disk. However, there has been no known example of a lubricant having such an effect.

[0009]

In order to ensure the reliability of the head / disk system of the hard disk drive, it is very effective to prevent the deterioration of the lubricant. As mentioned above, the deterioration of the lubricant
There are two modes of decomposition of perfluoropolyether and generation of a highly viscous substance, and it is an object of the present invention to suppress the respective deterioration modes.

[0010]

As a result of extensive studies by the present inventors, the decomposition of perfluoropolyether, which is a lubricant molecule, includes thermal decomposition by friction and chemical decomposition by reaction with a Lewis acid. I understood.

[0011] Thermal decomposition occurs at a temperature of about 150 ° C or higher by the cleavage of ether bonds in the main chain of perfluoropolyether. With the cleavage, two fluorines are eliminated, and the fluorine radical reacts with water molecules and rapidly reacts with the fluorine molecules.
Changes to molecular hydrofluoric acid (HF). Chemical decomposition occurs by this reaction with HF. That is, H in HF
^{The +} attacks the main chain ether oxygen, causing ether cleavage. Further, a similar decomposition reaction also occurs upon contact with Al ₂ O ₃ —TiC, which is a slider material. At this time, two molecules of HF are newly generated as in the case of thermal decomposition. That is, once the perfluoropolyether undergoes thermal decomposition or catalytic decomposition with Al ₂ O ₃ —TiC, a chain chemical decomposition reaction is caused by HF.

[0012] Highly viscous materials are formed by the formation of ether-cleaved perfluoropolyether fragments with metal ions. Metal ions are generated when metal components of the magnetic film diffuse to the surface through the medium protective layer, or when the magnetic film exposed by abrasion, cracking, peeling, or the like of the medium protective layer reacts with HF in the lubricant. .

In order to suppress the chain chemical decomposition of lubricant molecules and the formation of metal complexes, it is necessary to inhibit the reaction of HF, Al ₂ O ₃ —TiC, metal ions, etc. with perfluoropolyether. Considered valid.

That is, HF is generated when the lubricant is thermally decomposed due to the high-speed contact between the slider and the disk. By adding a substance whose reaction rate with HF is sufficiently higher than that of perfluoropolyether, HF is added. The reaction between the compound and the perfluoropolyether is suppressed to such an extent that there is no practical problem. Further, by adding a substance adsorbed on the surface of Al ₂ O ₃ —TiC, catalytic decomposition of perfluoropolyether is inhibited. Furthermore, the addition of a substance whose complexation constant with metal ions is sufficiently larger than that of perfluoropolyether for the formation of a highly viscous substance can be reduced to such an extent that the reaction between the metal ion and perfluoropolyether does not cause any problem. It is thought to be suppressed.

The present invention has been made based on such a concept. That is, a general formula of a substance whose reaction rate with HF is hundreds to thousands of times higher than that of perfluoropolyether and whose complex formation constant with metal ions is several tens to tens of thousands times higher than that of perfluoropolyether is claimed. Item 2
The general formula of the substance which adsorbs on the surface of Al ₂ O ₃ —TiC and inhibits the contact of the perfluoropolyether is specified in claim 2, and these compounds are added to the perfluoropolyether. A novel lubricant is defined in claims 1 to 11. Magnetic disks and magnetic disk devices using these new lubricants are also defined in claims 12 to 15.

As a result of applying these novel lubricants to a magnetic disk, chain degradation of perfluoropolyether by HF is suppressed even under conditions where high-speed contact between the slider and the disk constantly occurs, and at the same time, It was confirmed that the production of highly viscous substances was also suppressed. This means that from the viewpoint of lubrication performance, the change in friction coefficient μ is small in a CSS (contact start and stop) test, and the amount of highly viscous substances adhered to a head slider is reduced in a seek test. Was confirmed.

The present invention is particularly effective when applied to a magnetic recording device called a contact recording or a near-contact recording of a type in which a head and a medium are closely slid, which has been actively researched and developed in recent years. . That is, in the conventional magnetic recording apparatus of the levitation recording system, it is assumed that the head and the disk do not come into contact when the disk is rotated. However, in contact recording or near contact recording, friction between the head and the disk becomes a serious problem because the contact time between the head and the rotating disk surface is continuous.

Under such conditions, when the lubricants according to the first to eleventh aspects are used, particularly remarkable effects are obtained. Furthermore, as a result of applying the lubricant to floppy disks, audio tapes, and video tapes, it was possible to improve the running performance, abrasion resistance, and durability, and improve the performance.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The main chain structure of a perfluoropolyether compound as a main component of the present invention is represented by, for example, the following general formula. General formula -CF _2- (O-CF ₂ -CF ₂ ) _p- (O-CF ₂ ) _q -O-CF ₂ -General formula F- (CF ₂ -CF ₂ -CF ₂ ) _n -CF ₂ -CF ₂ -General formula CF _3- (O-CF- (CF ₃ ) -CF ₂ ) _m- (O-CF ₂ ) _l -The above p, q, n, m, l represent an integer of 1 or more.

However, the main chain structure of the perfluoropolyether according to the present invention is not limited to these. Examples of the terminal functional group include, for example, -CH ₂ OH,-
_{OH, -CH 2 COOH, -COOH,} -C 6 H 5, there may be mentioned fused ring group, not be construed as being limited thereto. Although the molecular weight is not particularly limited, the center molecular weight is preferably about 2,000 to 4,000.

The skeletons of the components of the present invention other than the perfluoropolyether are as follows.

[0022]

Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. These phenoxy derivative groups may have a substituent,
Some or all of the hydrogen atoms may be replaced by fluorine atoms. ]

[0023]

Embedded image [In the general formula [2], Z represents either a nitrogen atom or a phosphorus atom. R ¹ , R ² , and R ³ each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ]

[0024]

Embedded image [In the general formula [3], Z represents either a nitrogen atom or a phosphorus atom. R ¹ represents a hydrogen atom, a hydroxyl group, an alkyl group, or an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms.
R ² represents either an alkyl group or an aryl group. The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. ]

General formula [4] Z≡R [In general formula [4], Z represents either a nitrogen atom or a phosphorus atom. R represents either an alkyl group or an aryl group. The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. ]

[0026]

Embedded image [In the general formula [5], Z independently represents a nitrogen atom or a phosphorus atom. R ¹ , R ² , R ³ , and R ⁴ each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ]

[0027]

Embedded image [In the general formula [6], Z independently represents a nitrogen atom or a phosphorus atom. R ¹ , R ² , R ³ , R ⁴ , and R ⁵ each independently represent an alkyl group or an aryl group. R ¹ , R ² , R ⁴ and R ⁵ may be a hydrogen atom or a hydroxyl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ]

A heterocyclic compound containing one or more of any one of nitrogen, oxygen, phosphorus and sulfur, or a condensed polycyclic compound of this heterocyclic compound and another cyclic compound. The heterocyclic compound is represented, for example, by the following formula. NC ₄ H ₄ , N ₂ C ₃ H ₅ , NC ₅ H ₅ , NC ₅ H ₁₁ , NC ₆ H ₆ , NC _{7
H 7, NPC 8 H 6,} N 2 C 1 2 H 8, OC 4 H 4, OC 5 H 5, PC 4 H 4, PC 5 H 5, S
C ₄ H ₄ , OSC ₃ H ₃ , AsC ₄ H ₄ , AsC ₅ H ₅ , SeC ₄ H ₄ , SSeC ₃ H ₃ , SbC _{4
H 4, SbC 5 H 5,} TeC 4 H 4, Te 2 C 3 H 3. However, the heterocyclic compound in the present invention is not limited to these. Further, a substituent which may be present on these groups includes, for example, an alkyl group, an aryl group, a heterocyclic group, -F, -Cl, -Br-
I, -OH, -CO, -SH, -SCH ₃ , -NH ₂ , -N (CH ₃ ) ₂ , -NO, -NO ₂ ,
_{-NOH, -CHO, -COOH, -COOCH 3} , -CN, -SO, -PH 2, -P (CH
₃ ) ₂ , -CH ₂ OCH _{3 and the} like, but are not limited thereto.

Formula [7] R ¹ -ZR ² [In the formula [7], Z represents either an oxygen atom or a sulfur atom. R ¹ and R ² each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ]

General formula [8] Z = R [In general formula [8], Z represents either an oxygen atom or a sulfur atom. R represents either an alkyl group or an aryl group.
The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. ]

General formula [9] R ¹ -ZZR ² [In general formula [9], Z independently represents any one of an oxygen atom and a sulfur atom. R ¹ and R ² each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ]

Formula [10] R ¹ -Z-R ² -Z-
R ³ [In the general formula [10], Z independently represents an oxygen atom or a sulfur atom. R ¹ , R ² , and R ³ each independently represent an alkyl group or an aryl group. R ¹ ,
R ³ may be a hydrogen atom or a hydroxyl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ]

As described in the above general formulas [1] to [10]
The alkyl group or the aryl group is, for example,
It is shown by. -CH_Three, -CH_Two-CH_Three,-(CH_Two)_Five-CH
_Three,-(CH_Two)_Ten-CH_Three,-(CH_Two)_{Two 0}-CH_Three,-(CH_Two)₂₉-CH_Three,-
(CH_Two)_Three= C (CH_Three) -CH_Two-CH_Three,-(CH_Two)_Five-C (CH = CH_Two)_Two-CH_Two-C
H_Three,-(CH_Two)₆-C (CH_Two-CH_Two-CH_Three)_Two-(CH_Two)_Three-CH (CH_Two-CH_Two-CH_Two
-CH_Three) -CH_Two-CH_Three, -CF_Two-CF_Three,-(CF_Two)_Ten-CH_Three,-(CF_Two)_Three-
C (CH_Three) = CF-CF_Three,-(CF_Two)_{Two 6}-C (CF_Three)_Two-CF_Three, -C₆H_Five, -C₆
H_Four(-CH_Three), -C_TenH₇, -C_{1 0}H_Five(-CH_Two-CH_Three)_Two, -C_{1 Four}H₉,-
C₁₄H₆(-CH_Three) (-CH = CH_Two) (-CH_Two-CH_Two-CH_Three), -C₃₀H_{1 7}, -C₆
F_Five, -C_TenF_Five(-CH_Two-CH_Three)_Two, -C_TenF_Five(-CF_Two-CF_Three)_Two, -C₃₀F
_{1 7}. However, the alkyl group or the aryl group in the present invention
Is by no means limited to these. Also this
Substituents that may be present on these groups include, for example, alkyl groups,
Aryl group, heterocyclic group, -Cl, -Br -I, -OH, -CO, -SH,
-SCH_Three, -NH_Two, -N (CH_Three)_Two, -NO, -NO_Two, -NOH, -CHO, -CO
OH, -COOCH_Three, -CN, -SO, -PH_Two, -P (CH_Three)_Two, -CH_TwoOCH_Three etc
But are not limited to these.
Absent.

The lubricant of the present invention contains the compound represented by the general formula [1] in an amount of 0.1 to 50% by weight based on the perfluoropolyether described above, and the compound represented by the general formula [2] to
At least one of the compounds having a skeleton represented by [10]
It contains 1 to 100,000 ppm by weight in parts per million.

Further, the magnetic recording medium of the present invention is obtained by forming the lubricant of the present invention on a magnetic layer or a protective layer.
It is a magnetic recording medium in which the lubricating film is unlikely to be deteriorated even when the high-speed contact between the head slider and the recording medium occurs frequently.

FIG. 1 is a sectional view showing an example of the configuration of a magnetic recording medium according to the present invention. The magnetic recording medium of the present invention comprises a substrate 1
A magnetic layer 3 is formed thereon with a base layer 2 interposed therebetween, and a protective layer 4 is formed thereon. The underlayer 2 and the protective layer 4 may not be provided. The lubricating film 5 is applied on the protective layer 4.

The present invention is applied to a magnetic recording medium which comes into contact with or has a possibility of contacting a recording / reproducing head or a head slider, and more specifically, a hard disk medium, a floppy disk medium, a magnetic tape, etc. It is. The support for these magnetic recording media is not limited except that it is non-magnetic. That is, in the case of a hard disk medium, aluminum, glass, plastic, carbon, silicon and the like are exemplified, and in the case of a floppy disk and a magnetic tape medium, a synthetic resin such as polyacetate can be exemplified.

An underlayer may be provided between the support and the magnetic film. There is no restriction on the material and film thickness of the underlayer.
Ni-P and the like can be exemplified. There is no limitation on the film formation method, material, and film thickness of the magnetic film. That is, coating, plating, vapor deposition, sputtering, CV
The D method is exemplified. For materials, Fe, Co, N
metal such as i, their oxides, Co-Ni, Co-P
t, Fe-Ni, Fe-Co-Ni, Co-Cr-Pt
-Ta and the like are exemplified. There is no limitation on the protective layer, and examples thereof include amorphous carbon, hydrogenated carbon, nitrogen-added carbon, fluorine-added carbon, various metal-added carbon, diamond-like carbon, and silicon dioxide film. There is no particular limitation on the method of forming a lubricant on the magnetic recording medium as described above, but in the case of a hard disk medium, a dip method or a rotating film formation method can be exemplified. In this case, the thickness of the lubricating film is not particularly limited, but is about 1 to 1000 angstroms, preferably about 5 to 100 angstroms.

FIG. 2 is a block diagram schematically showing a magnetic recording apparatus according to a fifteenth aspect. In the figure, for example, four magnetic disks 9 are fixed at equal intervals. These magnetic disks 9 are rotated by a rotation mechanism 10.
At least one of the lubricants according to claims 1 to 11 is applied to both surfaces of each magnetic disk 9. A total of eight magnetic heads 6 are arranged near both sides of each magnetic disk 9 so as to sandwich each magnetic disk 9, and these magnetic heads 6 are each supported by a carriage 7 via a support spring 11.
It is supported by. The movement of the carriage 7 is controlled by a magnetic head moving mechanism 8.

[0040]

The present invention will be described in detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In the present specification, "=" used in the general formula means a double bond, and "=" used in other formulas means equol.

(Examples 1 to 15) describe the compound represented by the general formula [1] according to claim 2 and the compound represented by the general formula [2] according to claim 2 wherein Z is a nitrogen atom. This is an example of a lubricant comprising a fluoropolyether compound.

(1) Production of hard disk media

Production of concentration-developed sample: R ¹ = R ² = R ³ = R ⁴ = among those represented by the general formula [1]
1 mg of a compound (additive 1) having a molecular structure in which R ⁵ = R ⁶ = —O—C ₆ H ₄ —CF ₃ (para position), and Z = N among those represented by the general formula [2]; R ¹ = R ² = R ³
= 0.01 mg of a compound having a molecular structure of-(CH ₂ ) ₁₀ -CH ₃ (additive 2) was weighed, dissolved in 10 ml of ethanol, and the solution was dissolved in Fomblin Z-.
10 g of DOL (manufactured by Montefluos) and stirred well. This mixture was subjected to vacuum distillation at 60 ° C. for 30 mi.
The ethanol was continuously removed for n times to obtain a lubricant according to this example. This lubricant was dissolved in Fluorinert FC-77 (manufactured by Sumitomo 3M Limited) as a fluorocarbon solvent to prepare a 0.08 wt% solution. Using this solution, a lubricating film was formed by a normal dipping method on a disk on which a carbon protective layer was formed by a sputtering method, thereby producing a sample disk. Similarly, a concentration-developed sample disk was prepared in which the concentration in the lubricating film was 0.01 to 50 wt% for Additive 1 and 1 to 100,000 ppm for Additive 2.

The structure of the sample disk is as shown in FIG. The sample disk has a substrate height of 1.5
The diameter of the substrate surface roughened to less than μ ”
Using a 3.5 "aluminum substrate, Ni-P
An underlayer is formed, a magnetic layer is formed thereon, and a protective layer made of hydrogenated carbon is further formed by sputtering to a thickness of 10 nm.
A film is formed, and a lubricant is applied to the surface of the protective layer by dipping.
Angstrom applied.

Production of additive-deployed sample: Additive 1 was R ¹ = R ² = R ³ = R ⁴ = R ⁵ = R ⁶ = -OC ₆
The compound of H ₄ —CF ₃ (para position) is used, and the additive 2 is R
Compounds in which various substituents were introduced into ¹ , R ² and R ³ were used. An additive-developed sample disk was prepared in which the concentration of additive 1 was fixed at 10 wt% and the concentration of additive 2 was fixed at 1000 ppm.

Production of a known disk: For the purpose of comparison with known examples, tri-n-undecylamine N ((CH ₂ ) ₁₀ -CH _{3) 3} was to prepare a sample disk was formed 1000ppm added lubricant. Hereinafter, it is referred to as a known disk.

Production of Reference Disk A reference disk was prepared by performing exactly the same operation except that no additive was added.

(2) Lubrication performance test

The lubricating performance of the additive-developed sample disk, known disk, and reference disk was evaluated by CSS and seek tests.

In the CSS test, the disk to be evaluated is mounted on a spindle, the slider is adjusted so as to press against the disk surface with a preset load, and the slider is fixed so as not to move in the outer or inner circumferential direction. The rotation speed of the disk is increased to 0 to 3600 rpm, and the flying height of the slider is 5 nm at this time. Immediately decreasing to 0 rpm again is one cycle, and the friction coefficient μ after 20,000 cycles is compared with the initial value. Was evaluated. The slider used in this test was a two-rail type with a nano-slider (50% slider), made of Al ₂ O ₃ -TiC, and made of AB.
A 10-nm DLC protective layer was formed on S (rail sliding surface).

In the seek test, as in the CSS test, a disk and a slider were mounted, and the disk rotation speed was set to 3600 rpm.
pm, and the slider was repeatedly operated at a high speed from the outermost circumference to the innermost circumference again at the outermost circumference. This operation was continuously performed for 72 hours, and after the test, the amount of deposits on the rail running surface of the slider was visually measured. The measurement was evaluated by scoring the area of the rail running surface covered by the attached matter into 11 levels. That is, 0 point indicates that no deposit is observed at all, 1 point indicates that the area of less than 1% of the rail running surface of the slider is covered with the deposit, and 2 point indicates that 1% or more and less than 2% are covered. In the same manner, 10 points were determined when 10% or more of the area was covered.

The test conditions are shown in FIG.

(3) Results of study on the relationship between additive concentration and lubrication performance

FIG. 4 shows the results of the evaluation of the lubrication performance of the density-developed sample disk.

From the results shown in FIG. 4, it can be seen that the lubricant according to the present invention described in Example 1 has an additive 1 concentration of 0.01 to 50%.
wt%, additive 2 concentration within the range of 1 to 100000 ppm, C
It was found that there was an effect of suppressing an increase in the friction coefficient μ after SS and suppressing generation of a slider deposit.

(4) Investigation results on the relationship between the type of additive and lubrication performance

The lubricating performance of the additive-developed sample disk and the known disk was evaluated under the conditions shown in FIG. FIGS. 5 and 6 show the types of additives and the evaluation results.

From the results shown in FIGS. 5 and 6, the compound of the formula (1) and the compound of the formula (2) wherein Z = N was added to the perfluoropolyether. It has been found that the lubricant has an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing generation of a slider deposit. Further, according to the evaluation conditions of the present invention, Japanese Unexamined Patent Application Publication No.
It has been found that the known lubricant described in Japanese Patent No. 0675 cannot obtain a good lubricating performance and cannot suppress the generation of head deposits.

(Examples 16 to 30) show a compound represented by the general formula [1] described in claim 2 and a compound represented by the general formula [2] described in claim 2 wherein Z is a phosphorus atom; This is an example of a lubricant comprising a polyether compound.

A sample disk and a reference disk were prepared in the same manner as in Examples 1 to 15, and the relationship between the type of additive and the lubrication performance was examined. Among the additives represented by the general formula [1], R ¹ = R ² = R ³ = R ⁴ = R ⁵ = R ⁶ = -O-C ₆
A compound having a molecular structure of H ₄ —CF ₃ (para position),
And a compound in which various substituents were introduced into Z = P, R ¹ , R ² and R ³ in the general formula [2] was used.

FIG. 7 shows the evaluation conditions, and FIGS. 8 and 9 show the evaluation results.

From the results shown in FIGS. 8 and 9, the compound represented by the general formula [1] of claim 2 and the compound of the general formula [2] according to claim 2 wherein Z = P is a perfluoropolyether. It has been found that the lubricant added to has the effect of suppressing an increase in the friction coefficient μ after CSS and suppressing the generation of slider deposits. In addition, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot provide good lubrication performance and cannot suppress the generation of head deposits. I understood.

(Examples 31 to 45) show a compound represented by the general formula [1] described in claim 2 and a compound represented by the general formula [3] described in claim 3 wherein Z is a nitrogen atom; This is an example of a lubricant comprising a polyether compound.

In the general formula [1], R ¹ =
^{R 2 = R 3 = R 4} = R 5 = R 6 = -O-C 6 H 4 -CF
A compound having a molecular structure of ₃ (ortho position) (additive 3), and Z = N, R ¹ =-(CH
^{_{2) 10 -CH 3, R 2}} == CH (CH 2) 9 compound having the molecular structure is -CH ₃ for the (additive 4) to produce a concentration deployment sample disks in the same manner as in Example 1 . In the same manner as in Examples 1 to 15, additive-deployed sample disks in which various substituents were introduced into R ¹ and R ² of Additive 4 were produced. Further, Japanese Patent Laid-Open No. 5-20
No. 675, di-n-undecylamine NH ((CH ₂ ) ₁₀ CH ₃ ) which is a kind of alkylamine
_A well-known disk on which a lubricant containing 1000 ppm of ₂ was added was also prepared. Further, a reference disk was also prepared.

FIG. 10 shows the evaluation conditions, FIG. 11 shows the evaluation results of the concentration-developed sample disks, and FIGS. 12 and 13 show the evaluation results of the additive-developed sample disks.

From the results shown in FIG. 11, the lubricant according to the present invention described in Example 31 has an additive 3 concentration of 0.01 to 3.0.
It was found that when the concentration of the additive 4 was 50 wt% and the concentration of the additive 4 was in the range of 1 to 100,000 ppm, there was an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing the generation of slider deposits. From the results shown in FIGS. 12 and 13, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [3] according to claim 3 wherein Z = N is added to the perfluoropolyether. It was found that the lubricating agent had an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing generation of a slider deposit. In addition, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot provide good lubrication performance and cannot suppress the generation of head deposits. I understood.

(Examples 46 to 60) show a compound represented by the general formula [1] described in claim 2 and a compound represented by the general formula [3] described in claim 3 wherein Z is a phosphorus atom; This is an example of a lubricant comprising a polyether compound.

In the same manner as in Examples 1 to 15, additive-developed sample disks and reference disks were manufactured, and the relationship between the type of additive and the lubricating performance was examined. Among the additives represented by the general formula [1], R ¹ = R ² = R ³ = R ⁴ = R ⁵ = R ⁶ = -O-C ₆
A compound having a molecular structure of H ₄ —CF ₃ (ortho position) and a compound in which various substituents are introduced into Z = P, R ¹ and R ² in the general formula [3] were used.

FIG. 14 shows the evaluation conditions, and FIGS. 15 and 16 show the evaluation results.

From the results shown in FIGS. 15 and 16, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [3] according to claim 3, wherein Z = P, was converted to perfluoropolyether. It has been found that the lubricant added to the ether has the effect of suppressing the increase in μ after CSS and suppressing the formation of slider deposits. In addition, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot provide good lubrication performance and cannot suppress the generation of head deposits. I understood.

(Examples 61 to 75) show a compound represented by the general formula [1] according to claim 2 and a compound represented by the general formula [4] according to claim 4 wherein Z is a nitrogen atom; This is an example of a lubricant comprising a polyether compound.

In the general formula [1], R ¹ =
^{R 2 = R 3 = R 4} = R 5 = R 6 = -O-C 6 H 4 -CF
₃ A compound having a molecular structure of (meta position) (additive 5), and Z = N, R = ≡C- (C
With respect to the compound having a molecular structure of H ₂ ) ₁₀ —CH ₃ (additive 6), a concentration-developed sample disk was prepared in the same manner as in Example 1. Examples 1 to 1
In the same manner as in Example 5, additive-developed sample disks in which various substituents were introduced into R of Additive 6 were prepared. further,
N-Undecylamine NH ₂ (CH ₂ ) which is a kind of alkylamine described in JP-A-5-20675
A known disk on which a lubricant containing 1000 ppm of ₁₁ added was formed. Further, a reference disk was also prepared.

FIG. 17 shows the evaluation conditions, FIG. 18 shows the evaluation results of the sample disks in which the concentration is developed, and FIG. 19 shows the evaluation results of the sample disks in which the additive is developed.

From the results shown in FIG. 18, the lubricant according to the present invention described in Example 61 has an additive 5 concentration of 0.01 to 0.01%.
It was found that when the concentration of the additive 6 was within the range of 1 to 100,000 ppm, the increase in the friction coefficient μ after CSS was suppressed, and the effect of suppressing the formation of slider deposits was obtained. From the results shown in FIG. 19, it is found that Z = Z in the general formula [1] of claim 2 and the general formula [4] of claim 4.
It has been found that the lubricant in which the compound of N is added to the perfluoropolyether has an effect of suppressing an increase in μ after CSS and suppressing generation of a slider deposit. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 76 to 90) show a compound represented by the general formula [1] described in claim 2 and a compound represented by the general formula [4] described in claim 4 wherein Z is a phosphorus atom; This is an example of a lubricant comprising a polyether compound.

In the same manner as in Examples 1 to 15, additive-developed sample disks and reference disks were produced, and the relationship between the type of additive and the lubricating performance was examined. Among the additives represented by the general formula [1], R ¹ = R ² = R ³ = R ⁴ = R ⁵ = R ⁶ = -O-C ₆
A compound having a molecular structure of H ₄ —CF ₃ (para position) and a compound in which various substituents are introduced into Z = P, R in the general formula [4] were used.

FIG. 20 shows the evaluation conditions, and FIG. 21 shows the evaluation results.

From the results shown in FIG. 21, the compound represented by the general formula [1] of claim 2 and the compound represented by general formula [4] wherein Z = P was added to the perfluoropolyether. It was found that the lubricant has the effect of suppressing the increase in μ after CSS and suppressing the formation of slider deposits. Further, according to the evaluation conditions of the present invention, JP-A-5-2067
It has been found that the known lubricant described in Japanese Patent No. 5 cannot obtain good lubricating performance and cannot suppress the generation of head deposits.

(Examples 91 to 105) show a compound represented by the general formula [1] described in claim 2 and a compound represented by the general formula [5] described in claim 5 wherein Z = N, This is an example of a lubricant comprising an ether compound.

In the general formula [1], R ¹ =
^{R 2 = R 3 = R 4} = R 5 = R 6 = -O-C 6 H 4 -CF
A compound having a molecular structure of ₃ (para position) (additive 7), and Z = N and R ¹ = R ² = R in general formula [5]
^A concentration-developed sample disk was prepared in the same manner as in Example 1 for a compound having a molecular structure of ³ = R ⁴ =-(CH ₂ ) ₁₀ -CH ₃ (additive 8). Also,
In the same manner as in Examples 1 to 15, R ¹ of the additive 8,
Additive-developed sample disks in which various substituents were introduced into R ² , R ³ and R ⁴ were prepared. Further, Japanese Patent Laid-Open No. 5-20
No. 675, tri-n-undecylamine N ((CH ₂ ) ₁₁ OH) ₃ which is a kind of alkylamine
A known disk on which a lubricant with 1000 ppm was added was formed. Further, a reference disk was also prepared.

FIG. 22 shows the evaluation conditions, FIG. 23 shows the evaluation results of the sample disks in which the concentration is developed, and FIGS. 24 and 25 show the evaluation results of the sample disks in which the additive is developed.

From the results shown in FIG. 23, it can be seen that the lubricant according to the present invention described in Example 91 has an additive 7 concentration of 0.01 to
When the concentration of the additive was 50% and the concentration of the additive 8 was in the range of 1 to 100,000 ppm, it was found that there was an effect of suppressing the increase in the friction coefficient μ after CSS and suppressing the formation of the slider attached matter. From the results shown in FIGS. 24 and 25, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [5] wherein Z = N is added to the perfluoropolyether. It was found that the lubricating agent has an effect of suppressing an increase in μ after CSS and suppressing generation of a slider deposit.

(Examples 106 to 120) show a compound represented by the general formula [1] according to claim 2 and a compound represented by the general formula [5] according to claim 5 wherein Z is a phosphorus atom; This is an example of a lubricant comprising a polyether compound.

A sample disk and a reference disk were prepared in the same manner as in Examples 1 to 15, and the relationship between the type of the additive and the lubricating performance was examined. As the additive, among those represented by the general formula [1], R ¹ = R ² = R ³ = R ⁴ = R ⁵ = R ⁶ = -OC
A compound having a molecular structure of ₆ H ₄ —CF ₂ CF ₃ (para position), and Z = P, R ¹ ,
Compounds obtained by introducing various substituents into R ² , R ³ and R ⁴ were used.

FIG. 26 shows the evaluation conditions, and FIGS. 27 and 28 show the evaluation results.

From the results shown in FIG. 27 and FIG. 28, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [5] according to claim 5 wherein Z = N was converted to a perfluoropoly compound. It has been found that the lubricant added to the ether has an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing the formation of slider deposits. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 121 to 135) show a compound represented by the general formula [1] according to claim 2 and a compound represented by the general formula [6] according to claim 6 wherein Z is a nitrogen atom; This is an example of a lubricant comprising a polyether compound.

In the general formula [1], R ¹ =
^{R 2 = R 3 = R 4} = R 5 = R 6 = -O-C 6 H 4 -CF
A compound having a molecular structure of ₂ CF ₃ (ortho position) (additive 9), and Z = N and R ¹ =
^{R 2 = R 3 = R 4} = R 5 = - (CH 2) 10 -CH 3, R
_{^{3 = - (CH 2) 10}} - compound having a molecular structure which is the (additive 10), in the same manner as in Example 1 to 15, R ¹ of the additive ^{10, R 2, R 3,} R 4 were prepared additive sample disks introduced various substituents on R ^5. Further, there is also a known disk in which a lubricant containing 1000 ppm of di-n-undecinolamine NH ((CH ₂ ) ₁₁ OH) ₂ , which is a kind of alkylamine, described in JP-A-5-20675 is added. Produced. Further, a reference disk was also prepared.

FIG. 29 shows the evaluation conditions, FIG. 30 shows the evaluation results of the concentration developed sample disks, and FIGS. 31, 32 and 33 show the evaluation results of the additive developed sample disks.

From the results shown in FIG. 30, the lubricant according to the present invention described in Example 121 has a concentration of the additive 9 of 0.01.
It was found that when the concentration of Additive 10 was within the range of 1 to 100,000 ppm, the increase in the friction coefficient μ after CSS was suppressed, and the effect of suppressing the generation of slider deposits was obtained. From the results shown in FIG. 31, FIG. 32 and FIG. 33, the compound represented by the general formula [1] according to claim 2 and the compound represented by the general formula [6] according to claim 6 wherein Z = N was converted to a perfluoropoly compound. It has been found that the lubricant added to the ether has an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing the formation of slider deposits. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 136 to 150) show compounds represented by the general formula [1] according to claim 2 and the compound represented by the general formula [6] according to claim 6 wherein Z is a phosphorus atom; This is an example of a lubricant comprising a polyether compound.

A sample disk and a reference disk were prepared in the same manner as in Examples 1 to 15, and the relationship between the type of additive and the lubricating performance was examined. Among the additives represented by the general formula [1], R ¹ = R ² = R ³ = R ⁴ = R ⁵ = R ⁶ = -O-C ₆
A compound having a molecular structure of H ₄ —CF ₂ CF ₃ (ortho position), and Z = P, R ¹ ,
Compounds in which various substituents were introduced into R ² , R ³ , R ⁴ and R ₅ were used.

FIG. 34 shows the evaluation conditions, and FIG. 35 shows the evaluation results.
This is shown in FIGS. 36 and 37.

From the results shown in FIG. 35, FIG. 36 and FIG. 37, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [6] according to claim 6 wherein Z = P is obtained. The lubricant added to the perfluoropolyether is CSS
It was found that there was an effect of suppressing the increase of the friction coefficient μ later and suppressing the formation of the slider deposits. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubrication performance,
Also, it was found that it was not possible to suppress the generation of head deposits.

(Examples 151 to 165) show a compound represented by the general formula [1] described in claim 2 and a heterocyclic compound or a condensed polycyclic compound of a heterocyclic compound and another cyclic compound described in claim 7. This is an example of a lubricant composed of a compound in which an atom other than carbon, that is, a hetero atom, is N and a perfluoropolyether compound.

In the general formula [1], R ¹ =
^{R 2 = R 3 = R 4} = R 5 = R 6 = -O-C 6 H 4 -CF
_The concentration development of a compound having a molecular structure of ₂ CF ₃ (meta position) (additive 11) and pyrrole (additive 12) among the heterocyclic compounds according to claim 7 in the same manner as in Example 1. A sample disk was prepared. In the same manner as in Examples 1 to 15, additive-development sample disks were produced using various heterocyclic compounds. Furthermore, n-undecinolamine NH which is a kind of alkylamine described in JP-A-5-20675 is disclosed.
A known disk on which a lubricant containing 1000 ppm of ₂ (CH ₂ ) ₁₁ OH was added was also prepared. Further, a reference disk was also prepared.

FIG. 38 shows the evaluation conditions, FIG. 39 shows the evaluation results of the concentration-developed sample disks, and FIG. 40 shows the evaluation results of the additive-developed sample disks.

From the results shown in FIG. 39, it can be seen that the lubricant according to the present invention described in Example 151 has the additive 11 concentration of 0.0
1 to 50%, additive 12 concentration is 1 to 100,000 ppm
It was found that within the range, the increase in the friction coefficient μ after CSS was suppressed, and the effect of suppressing the formation of slider deposits was obtained.

From the results shown in FIG. 40, it can be seen that the ring of the general formula [1] of claim 2 and the heterocyclic compound or the condensed polycyclic compound of the heterocyclic compound and another cyclic compound according to claim 7 constitute a ring. A compound in which an atom other than carbon, that is, a compound in which a hetero atom is N, is added to the perfluoropolyether to suppress the increase in the friction coefficient μ after CSS and to suppress the generation of slider deposits. I understood. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 166 to 180) show a compound represented by the general formula [1] described in claim 2 and a heterocyclic compound or a condensed polycyclic compound of a heterocyclic compound and another cyclic compound described in claim 7. This is an example of a lubricant composed of a compound in which an atom other than carbon, that is, a hetero atom, which is P, and a perfluoropolyether-based compound.

In the same manner as in Examples 1 to 15, additive-developed sample disks and reference disks were manufactured, and the relationship between the type of additive and the lubricating performance was examined. Among the additives represented by the general formula [1], R ¹ = R ² = R ³ = R ⁴ = R ⁵ = R ⁶ = -O-C ₆
A compound having a molecular structure of H ₄ —CF ₂ CF ₃ (meta position), and 15 types of the heterocyclic compound or the condensed polycyclic compound of the heterocyclic compound and another cyclic compound according to claim 7. used.

FIG. 41 shows the evaluation conditions, and FIG. 42 shows the evaluation results.

From the results shown in FIG. 42, the ring of the general formula [1] of claim 2 and the heterocyclic compound or the condensed polycyclic compound of the heterocyclic compound and another cyclic compound according to claim 7 constitute a ring. A lubricant in which an atom other than carbon, that is, a compound in which the heteroatom is P, is added to the perfluoropolyether has the effect of suppressing the increase in the friction coefficient μ after CSS and suppressing the formation of slider deposits. I understood. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 181 to 195) show a compound represented by the general formula [1] described in claim 2 and a compound represented by the general formula [7] described in claim 8 wherein Z is a chlorine atom; This is an example of a lubricant comprising a polyether compound.

Of the compounds represented by the general formula [1], R ^{1
= R 3 = R 5 = -O} -C 6 H 4 -CF 3 ( ortho),
^{R 2 = R 4 = R 6} = -O-C 6 H 4 -CF 3 ( para)
(Additive 13) having the following molecular structure, and Z = N, R ¹ = R ² = R ⁴ = R ⁵ = − in the general formula [7].
For a compound (additive 14) having a molecular structure of (CH ₂ ) ₁₀ —CH ₃ , R ³ = — (CH ₂ ) ₁₀ —, a concentration-developed sample disk was prepared in the same manner as in Example 1. In the same manner as in Examples 1 to 15, additive sample disks in which various substituents were introduced into R ¹ , R ² , R ³ , R ⁴ , and R ⁵ of the additive 14 were produced. Further, tri-n-hexylamine N ((C
A known disk on which a lubricant film containing 1000 ppm of H ₂ ) ₆ OH) ₃ was added was also prepared. Further, a reference disk was also prepared.

FIG. 43 shows the evaluation conditions, FIG. 44 shows the evaluation results of the sample disks in which the concentration was developed, and FIGS. 45 and 46 show the evaluation results of the sample disks in which the additive was developed.

From the results shown in FIG. 44, it can be seen that the lubricant according to the present invention described in Example 181 has an additive 13 concentration of 0.0
1 to 50%, additive 14 concentration is 1 to 100000 ppm
It was found that within the range, the increase in the friction coefficient μ after CSS was suppressed, and the effect of suppressing the formation of slider deposits was obtained. From the results shown in FIGS. 45 and 46, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [7] wherein Z］ O is added to the perfluoropolyether. It was found that the lubricating agent had an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing generation of a slider deposit. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 196 to 210) show a compound represented by the general formula [1] according to claim 2 and a compound represented by the general formula [7] according to claim 8 wherein Z is a sulfur atom; This is an example of a lubricant comprising a polyether compound.

A sample disk and a reference disk were prepared in the same manner as in Examples 1 to 15, and the relationship between the type of additive and the lubricating performance was examined. Among the additives represented by the general formula [1], R ¹ ＲR ³ ＲR ⁵ −—O—C ₆ H ₄ —CF ₃ (ortho position) and R ² ＲR ⁴ ＲR ⁶ −—O -C ₆ H ₄ -CF
A compound having a molecular structure of ₃ (para position) and a compound in which various substituents are introduced into Z = S, R ¹ and R ^{2 in} the general formula [7] were used.

FIG. 47 shows the evaluation conditions, and FIGS. 48 and 49 show the evaluation results.

From the results shown in FIGS. 48 and 49, the general formula [1] according to claim 2 and the general formula [7] according to claim 8
It has been found that a lubricant in which a compound in which Z = S is added to the perfluoropolyether among the compounds represented by, has the effect of suppressing the increase in the friction coefficient μ after CSS and suppressing the formation of slider deposits. Was. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubrication performance,
It was found that it was not possible to suppress the generation of head deposits.

(Examples 211 to 225) show a compound represented by the general formula [1] described in claim 2 and a compound represented by the general formula [8] described in claim 9 wherein Z is a chlorine atom; This is an example of a lubricant comprising a polyether compound.

In the general formula [1], R ¹ =
^{R 3 = R 5 = -O-} C 6 H 4 -CF 2 CF 3 ( ^{ortho), R 2 = R 4 =} R 6 = -O-C 6 H 4 -CF 2 CF
₃ A compound having a molecular structure (para position) (additive 1
5) and Z = O and R = CH (CH
₂ ) For a compound having a molecular structure of _9- CH ₃ (additive 16), a concentration-developed sample disk was prepared in the same manner as in Example 1. Examples 1 to 1
In the same manner as in Example 5, additive sample disks in which various substituents were introduced into R of the additive 16 were prepared. Further, di-n-hexylamine NH ((CH ₂ ) _5, which is a kind of alkylamine described in JP-A-5-20675.
A known disk on which a lubricant containing 1000 ppm of CH ₃ ) ₂ was added was also prepared. Further, a reference disk was also prepared.

FIG. 50 shows the evaluation conditions, FIG. 51 shows the evaluation results of the concentration developed sample disks, and FIG. 52 shows the evaluation results of the additive developed sample disks.

From the results shown in FIG. 51, it can be seen that the lubricant according to the present invention described in Example 211 has an additive 15 concentration of 0.0
1 to 50%, additive 16 concentration is 1 to 100000 ppm
It was found that within the range, the increase in the friction coefficient μ after CSS was suppressed, and the effect of suppressing the formation of slider deposits was obtained. From the results shown in FIG. 52, a lubricant in which the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [8] according to claim 9 wherein Z ＝ O is added to perfluoropolyether Was found to have an effect of suppressing the increase in the friction coefficient μ after CSS and suppressing the generation of slider deposits. In the evaluation conditions of the present invention, Japanese Patent Application Laid-Open
It has been found that the known lubricant described in Japanese Patent No. 20675 cannot obtain good lubrication performance and cannot suppress the generation of head deposits.

(Examples 226 to 240) show a compound represented by the general formula [1] described in claim 2, a compound represented by the general formula [8] described in claim 9 wherein Z = S, This is an example of a lubricant comprising an ether compound.

In the same manner as in Examples 1 to 15, additive-developed sample disks and reference disks were manufactured, and the relationship between the type of additive and the lubricating performance was examined. Among the additives represented by the general formula [1], R ¹ = R ³ = R ⁵ = —O—C ₆ H ₄ —CF ₂ CF ₃
^{(Ortho), R 2 = R 4 =} R 6 = -O-C 6 H 4 -C
Compounds having a molecular structure of F ₂ CF ₃ (para position) and compounds of formula [8] in which various substituents were introduced into ZＺS, R were used.

FIG. 53 shows the evaluation conditions, and FIG. 54 shows the evaluation results.

From the results shown in FIG. 54, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [8] wherein Z = S is added to the perfluoropolyether. It was found that the lubricating agent had an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing generation of a slider deposit. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 241 to 255) show a compound represented by the general formula [1] described in claim 2, a compound represented by the general formula [9] described in claim 10 wherein Z ＝ O, This is an example of a lubricant comprising an ether compound.

In the general formula [1], R ¹ =
R ³ = R ⁵ = -OC ₆ H ₄ -CF ₃ (ortho position), R
^{2 = R 4 = R 6 =} -O-C 6 H 4 compounds having a molecular structure which is -CF ₂ CF ₃ (para) (Additives 17), and Z = O of the general formula [9], R ¹ = R ² = - (C
With respect to the compound having a molecular structure of H ₂ ) ₁₀ —CH ₃ (additive 18), a concentration-developed sample disk was prepared in the same manner as in Example 1 above. Examples 1 to 5
In the same manner as in Example 15, additive sample disks in which various substituents were introduced into R ¹ and R ² of Additive 18 were prepared. Further, n-hexylamine NH ₂ (CH, which is a kind of alkylamine described in JP-A-5-20675)
₂ ) A well-known disk on which a lubricant containing 1000 ppm of ₆ OH was added was also prepared. Further, a reference disk was also prepared.

FIG. 55 shows the evaluation conditions, FIG. 56 shows the evaluation results of the concentration developed sample disks, and FIGS. 57 and 58 show the evaluation results of the additive developed sample disks.

From the results shown in FIG. 56, it can be seen that the lubricant according to the present invention described in Example 241 has an additive 15 concentration of 0.0
1 to 50%, additive 16 concentration is 1 to 100000 ppm
It was found that within the range, the increase in the friction coefficient μ after CSS was suppressed, and the effect of suppressing the formation of slider deposits was obtained.

From the results shown in FIG. 56, the compound represented by the general formula [1] according to claim 2 and the compound represented by general formula [9] wherein Z = O is added to the perfluoropolyether. It was found that the lubricating agent had an effect of suppressing an increase in the friction coefficient μ after CSS and suppressing generation of a slider deposit. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 256 to 270) show a compound represented by the general formula [1] according to claim 2 and a compound represented by the general formula [9] according to claim 10 wherein Z is a sulfur atom; This is an example of a lubricant comprising a polyether compound.

In the same manner as in Examples 1 to 15, additive development sample disks and reference disks were prepared, and the relationship between the type of additive and the lubrication performance was examined. Among the additives represented by the general formula [1], R ¹ ＲR ³ ＲR ⁵ −—O—C ₆ H ₄ —CF ₃ (ortho position) and R ² ＲR ⁴ ＲR ⁶ −—O -C ₆ H ₄ -CF ₂ C
A compound having a molecular structure of F ₃ (para-position) and a compound in which various substituents are introduced into Z = S, R in the general formula [9] were used.

FIG. 59 shows the evaluation conditions, and FIGS. 60 and 61 show the evaluation results.

From the results shown in FIGS. 60 and 61, the compound represented by the general formula [1] according to claim 2 and the compound represented by the general formula [9] according to claim 10 wherein Z = S was obtained.
The lubricant added to the perfluoropolyether is CSS
It was found that there was an effect of suppressing the increase of the friction coefficient μ later and suppressing the formation of the slider deposits. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubrication performance,
Also, it was found that it was not possible to suppress the generation of head deposits.

(Examples 271 to 285) show the general formula [1] described in claim 2 and the general formula [10] described in claim 11
This is an example of a lubricant composed of a compound in which Z is an oxygen atom and a perfluoropolyether compound.

In the general formula [1], R ¹ =
^{R 3 = R 5 = -O-} C 6 H 4 -CF 2 CF 3 ( ^{ortho), R 2 = R 4 =} R 6 = -O-C 6 H 4 -CF 3 ( para) at which the molecular structure A compound having the formula (additive 19),
And Z = O, R ¹ = R ³ =-(CH
^{_{2) 10 -CH 3, R 2}} = - (CH 2) 10 - for compounds having a molecular structure which is (additives 20) to produce a concentration deployment sample disks in the same manner as in Example 1. Additive 2 was prepared in the same manner as in Examples 1 to 15.
R ¹ 0, to produce a R ^2, additive sample disks introduced various substituents on R ^3. Further, Japanese Patent Laid-Open No. 5-20
No. 675, tri-n-hexanolamine N ((CH ₂ ) ₆ OH) which is a kind of alkylamine
A known disk on which a lubricant formed by adding 1000 ppm of ₃ was formed was also prepared. Further, a reference disk was also prepared.

FIG. 62 shows the evaluation conditions, FIG. 63 shows the evaluation results of the sample disks in which the concentration is developed, and FIGS. 64 and 65 show the evaluation results of the sample disks in which the additive is developed.

From the results shown in FIG. 63, it can be seen that the lubricant according to the present invention described in Example 271 has a concentration of additive 19 of 0.0
1 to 50%, additive 20 concentration is 1 to 100,000 ppm
It was found that within the range, the increase in the friction coefficient μ after CSS was suppressed, and the effect of suppressing the formation of slider deposits was obtained. From the results shown in FIG. 64 and FIG. 65, the compound represented by the general formula [1] according to claim 2 and the compound represented by the general formula [10] according to claim 11 wherein ZＯO is a perfluoropolyether It has been found that the lubricant added to has the effect of suppressing an increase in the friction coefficient μ after CSS and suppressing the generation of slider deposits. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

(Examples 286 to 300) show the general formula [1] according to claim 2 and the general formula [10] according to claim 11
This is an example of a lubricant composed of a compound in which Z = S and a perfluoropolyether-based compound.

A sample disk and a reference disk were prepared in the same manner as in Examples 1 to 15, and the relationship between the type of additive and the lubricating performance was examined. Among the additives represented by the general formula [1], R ¹ = R ³ = R ⁵ = —O—C ₆ H ₄ —CF ₂ CF ₃
^{(Ortho), R 2 = R 4 =} R 6 = -O-C 6 H 4 -C
A compound having a molecular structure of F ₃ (para position) and a compound in which various substituents are introduced into Z = S, R ¹ , R ² , and R ³ in the general formula [10] were used.

The evaluation conditions are shown in FIG. 66, and the evaluation results are shown in FIGS. 67 and 68.

From the results shown in FIGS. 67 and 68, the general formula [1] according to claim 2 and the general formula [1] according to claim 11
0] and a compound in which Z = S is added to the perfluoropolyether, the lubricant has the effect of suppressing the increase in the friction coefficient μ after CSS and the generation of slider deposits. I understood. Further, under the evaluation conditions of the present invention, the known lubricant described in JP-A-5-20675 cannot obtain good lubricating performance and cannot suppress the generation of head deposits. I understand.

[0137]

As is clear from the above description, the lubricant of the present invention prevents the decomposition of perfluoropolyether and the formation of a highly viscous substance. This has the effect of suppressing the formation of deposits. Therefore, the magnetic recording medium on which the lubricant is formed can maintain its lubricating property over a long period of time under any use conditions. Therefore, a magnetic recording device using this magnetic recording medium has higher reliability than conventional magnetic recording devices, and has the effect of extending the life of the device.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing one configuration example of a magnetic recording medium of the present invention.

FIG. 2 is a configuration diagram schematically showing a magnetic recording apparatus of the present invention.

FIG. 3 is a table showing test conditions for evaluating lubrication performance in Examples 1 to 15.

FIG. 4 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 1 to 15.

FIG. 5 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 1 to 15.

FIG. 6 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 1 to 15.

FIG. 7 is a table showing test conditions for evaluating lubrication performance in Examples 16 to 30.

FIG. 8 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 16 to 30.

FIG. 9 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 16 to 30.

FIG. 10 is a table showing evaluation test conditions for lubricating performance in Examples 31 to 45.

FIG. 11 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 31 to 45.

FIG. 12 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 31 to 45.

FIG. 13 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 31 to 45.

FIG. 14 is a table showing test conditions for evaluating lubrication performance in Examples 46 to 60.

FIG. 15 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 46 to 60.

FIG. 16 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 46 to 60.

FIG. 17 is a table showing test conditions for evaluating lubrication performance in Examples 61 to 75.

FIG. 18 is a table showing evaluation results on the relationship between additive concentration and lubricating performance in Examples 61 to 75.

FIG. 19 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 61 to 75.

FIG. 20 is a table showing test conditions for evaluating lubrication performance in Examples 76 to 90.

FIG. 21 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 76 to 90.

FIG. 22 is a table showing test conditions for evaluating lubrication performance in Examples 91 to 105.

FIG. 23 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 91 to 105.

FIG. 24 is a chart showing evaluation results on the relationship between types of additives and lubrication performance in Examples 91 to 105.

FIG. 25 is a table showing evaluation results on the relationship between the type of additive and lubrication performance in Examples 91 to 105.

FIG. 26 is a table showing test conditions for evaluating lubrication performance in Examples 106 to 120.

FIG. 27 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 106 to 120.

FIG. 28 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 106 to 120.

FIG. 29 is a table showing test conditions for evaluating lubrication performance in Examples 121 to 135.

FIG. 30 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 121 to 135.

FIG. 31 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 121 to 135.

FIG. 32 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 121 to 135.

FIG. 33 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 121 to 135.

FIG. 34 is a table showing test conditions for evaluating lubrication performance in Examples 136 to 150.

FIG. 35 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 136 to 150.

FIG. 36 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 136 to 150.

FIG. 37 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 136 to 150.

FIG. 38 is a table showing test conditions for evaluating lubrication performance in Examples 151 to 165.

FIG. 39 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 151 to 165.

FIG. 40 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 151 to 165.

FIG. 41 is a table showing test conditions for evaluating lubrication performance in Examples 165 to 180.

FIG. 42 is a table showing evaluation results on the relationship between the type of additive and lubrication performance in Examples 165 to 180.

FIG. 43 is a table showing test conditions for evaluating lubrication performance in Examples 181 to 195.

FIG. 44 is a table showing evaluation results of the relationship between additive concentration and lubrication performance in Examples 181 to 195.

FIG. 45 is a chart showing evaluation results on the relationship between the type of additive and lubrication performance in Examples 181 to 195.

FIG. 46 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 181 to 195.

FIG. 47 is a table showing test conditions for evaluating lubrication performance in Examples 196 to 210.

FIG. 48 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 196 to 210.

FIG. 49 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 196 to 210.

FIG. 50 is a table showing evaluation test conditions for lubricating performance in Examples 211 to 225.

FIG. 51 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 211 to 225.

FIG. 52 is a table showing evaluation results of the relationship between the type of additive and lubrication performance in Examples 211 to 225.

FIG. 53 is a table showing test conditions for evaluating lubrication performance in Examples 226 to 240.

FIG. 54 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 226 to 240.

FIG. 55 is a table showing test conditions for evaluating lubrication performance in Examples 241 to 255.

FIG. 56 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 241 to 255.

FIG. 57 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 241 to 255.

FIG. 58 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 241 to 255.

FIG. 59 is a table showing test conditions for evaluating lubrication performance in Examples 256 to 270.

FIG. 60 is a table showing evaluation results on the relationship between the type of additive and lubrication performance in Examples 256 to 270.

FIG. 61 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 256 to 270.

FIG. 62 is a table showing evaluation test conditions for lubricating performance in Examples 271 to 285.

FIG. 63 is a table showing evaluation results on the relationship between additive concentration and lubrication performance in Examples 271 to 285.

FIG. 64 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 271 to 285.

FIG. 65 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 271 to 285.

FIG. 66 is a table showing test conditions for evaluating lubrication performance in Examples 286 to 300.

FIG. 67 is a table showing evaluation results on the relationship between types of additives and lubrication performance in Examples 286 to 300.

FIG. 68 is a table showing evaluation results on the relationship between the type of additive and lubrication performance in Examples 286 to 300.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Underlayer 3 Magnetic layer 4 Protective layer 5 Lubricating film 6 Magnetic head 7 Carriage 8 Magnetic head moving mechanism 9 Magnetic disk 10 Magnetic disk rotating mechanism 11 Support spring

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI G11B 5/72 G11B 5/72 // C10N 30:06 40:18 (58) Investigated field (Int.Cl. ⁶ , DB name ) G11B 5/66 C10M 107/38 C10M 105/74 C10M 133/02-133/14 C10M 137/12 C10M 137/16 G11B 5/72 C10N 30:06 C10N 40:18 WPI / L (QUESTEL)

Claims (15)

(57) [Claims] 1. A phenyl ether derivative of phosphazene in a perfluoropolyether-based compound,
Magnetic recording containing 50 wt%, a rate of reaction with HF greater than that of the perfluoropolyether compound, and a substance having a complexation constant with a metal ion greater than that of the perfluoropolyether compound, 1 to 100,000 ppm. Lubricant for media. 2. A compound represented by the following general formula [1] in a perfluoropolyether compound in an amount of 0.5 to 50 wt.
%, At least one compound having a skeleton represented by the following general formulas [2] to [10] is 1 to 100,000 pp
m, a lubricant for a magnetic recording medium contained therein. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. [Chemical formula 2] [In the general formula [2], Z represents a nitrogen atom or a phosphorus atom.
R ¹ , R ² and R ³ each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. [Chemical formula 3] [In the general formula [3], Z represents either a nitrogen atom or a phosphorus atom. R ¹ represents any ^one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. R
² represents either an alkyl group or an aryl group. The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. General formula [4] Z≡R [In general formula [4], Z represents either a nitrogen atom or a phosphorus atom. R represents either an alkyl group or an aryl group. The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. [Formula 4] [In the general formula [5], Z independently represents a nitrogen atom or a phosphorus atom. R ¹ , R ² , R ³ , and R ⁴ each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. [Chemical formula 5] [In the general formula [6], Z independently represents a nitrogen atom or a phosphorus atom. R ¹ , R ² , R ³ , R ⁴ , and R ⁵ each independently represent an alkyl group or an aryl group. R ¹ , R ² , R ⁴ and R ⁵ may be a hydrogen atom or a hydroxyl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. General formula [7] R ¹ -ZR ² [In general formula [7], Z represents either an oxygen atom or a sulfur atom. R ¹ and R ² each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group.
These alkyl groups or aryl groups may have a substituent, and some or all of the hydrogen atoms may be substituted with fluorine atoms. General formula [8] Z = R [In general formula [8], Z represents either an oxygen atom or a sulfur atom. R represents either an alkyl group or an aryl group.
The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. General formula [9] R ¹ -ZZR ² [In the general formula [9], Z independently represents any one of an oxygen atom and a sulfur atom. R ¹ and R ² each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. General formula [10] R ¹ -ZR ² -ZR ³ [In general formula [10], Z independently represents any one of an oxygen atom and a sulfur atom. R ¹ , R ² and R ³ each independently represent an alkyl group or an aryl group.
R ¹ and R ³ may be a hydrogen atom or a hydroxyl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ] 3. A compound represented by the following general formula [1] in an amount of 0.1 to 50 wt.
%, The compound represented by the following general formula [3] is 1 to 100,000
ppm, contained lubricant for magnetic recording media. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. [Formula 7] [In the general formula [3], Z represents either a nitrogen atom or a phosphorus atom. R ¹ represents any ^one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. R
² represents either an alkyl group or an aryl group. The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. ] 4. A compound represented by the following general formula [1] in a perfluoropolyether compound in an amount of 0.1 to 50 wt.
%, A compound represented by the following general formula [4] is 1 to 100,000
ppm, contained lubricant for magnetic recording media. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. General formula [4] Z≡R [In general formula [4], Z represents either a nitrogen atom or a phosphorus atom. R represents either an alkyl group or an aryl group. The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. ] 5. A compound represented by the following general formula [1] in an amount of 0.1 to 50 wt.
%, A compound represented by the following general formula [5] is 1 to 100,000
ppm, contained lubricant for magnetic recording media. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. ] [In the general formula [5], Z independently represents a nitrogen atom or a phosphorus atom. R ¹ , R ² , R ³ , and R ⁴ each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ] 6. A compound represented by the following general formula [6] in a perfluoropolyether-based compound:
ppm, a compound represented by the following general formula [1] is 0.1 to 50 wt.
%, Contained lubricant for magnetic recording media. Embedded image [In the general formula [6], Z independently represents a nitrogen atom or a phosphorus atom. R ¹ , R ² , R ³ , R ⁴ , and R ⁵ each independently represent an alkyl group or an aryl group. R ¹ , R ² , R ⁴ and R ⁵ may be a hydrogen atom or a hydroxyl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ] 7. The perfluoropolyether compound may contain any one of a nitrogen atom, an oxygen atom, a phosphorus atom, and a sulfur atom.
A heterocyclic compound containing at least one kind of one or more atoms, or a fused polycyclic compound of this heterocyclic compound and another cyclic compound is 1 to 1
00000 ppm, 0.1-50 wt% of a compound represented by the following general formula [1]
%, Contained lubricant for magnetic recording media. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. ] 8. A compound represented by the following general formula [1] in an amount of 0.1 to 50 wt.
%, A compound represented by the following general formula [7] is 1 to 100000
ppm, contained lubricant for magnetic recording media. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. General formula [7] R ¹ -ZR ² [In general formula [7], Z represents either an oxygen atom or a sulfur atom. R ¹ and R ² each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group.
These alkyl groups or aryl groups may have a substituent, and some or all of the hydrogen atoms may be substituted with fluorine atoms. ] 9. A compound represented by the following general formula [1] in an amount of 0.1 to 50 wt.
%, A compound represented by the following general formula [8] is 1 to 100,000
ppm, contained lubricant for magnetic recording media. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. General formula [8] Z = R [In general formula [8], Z represents either an oxygen atom or a sulfur atom. R represents either an alkyl group or an aryl group.
The alkyl group or the aryl group may have a substituent, and part or all of the hydrogen atoms may be substituted with a fluorine atom. ] 10. A compound represented by the following general formula [1] in an amount of 0.1 to 50 wt.
%, A compound represented by the following general formula [9] is 1 to 100000
ppm, contained lubrication for magnetic recording media [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. General formula [9] R ¹ -ZZR ² [In the general formula [9], Z independently represents any one of an oxygen atom and a sulfur atom. R ¹ and R ² each independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group, and an aryl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ] 11. A compound represented by the following general formula [1] in a perfluoropolyether compound in an amount of 0.1 to 50 wt.
%, The compound represented by the following general formula [10] is 1 to 10000
0 ppm, contained lubricant for magnetic recording media. Embedded image [In the general formula [1], R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R
⁶ each independently represents a phenoxy derivative group. This phenoxy derivative group may have a substituent, and part or all of the hydrogen atoms may be substituted by fluorine atoms. General formula [10] R ¹ -ZR ² -ZR ³ [In general formula [10], Z independently represents any one of an oxygen atom and a sulfur atom. R ¹ , R ² and R ³ each independently represent an alkyl group or an aryl group.
R ¹ and R ³ may be a hydrogen atom or a hydroxyl group. These alkyl groups or aryl groups may have a substituent, and part or all of the hydrogen atoms may be substituted with fluorine atoms. ] 12. A magnetic film on a substrate directly or via an underlayer, and a magnetic film on the magnetic film directly or via a protective layer. 8, 9, 10, or 1
A magnetic recording medium coated with at least one of the lubricants for magnetic recording media according to 1. 13. The magnetic recording medium according to claim 12, wherein the underlayer is made of Ni—P or Cr. 14. The protective layer is made of hydrogenated carbon or hydrogen and nitrogen added carbon.
The magnetic recording medium according to the above. 15. A magnetic head for recording or reproducing information by being relatively moved while being in close contact with the magnetic recording medium according to claim 12, 13, and 14. A magnetic recording device comprising: a support spring for pressing the magnetic recording medium.