JP2001122961A - Fluororesin and lubricant containing the same, and magnetic disk using the lubricant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluororesin capable of forming lubricating films which have high adhesivity to the surfaces of magnetic disks, are scarcely rubbed and worn, and have good heat resistance, and also to provide a magnetic disk having a lubricating film formed from the fluororesin. SOLUTION: The fluororesin having triorganosilyl groups of formula (1) (R1, R2 and R3 are each independently an alkyl, an alkenyl, an aryl, an aralkyl, or one of their halogen or nitrogen-substituted groups) or eight π-electron-having organic groups of formula (2) (R4, R5 and R6 are each independently H or an organic group, provided that at leas one of R4, R5 and R6 is an organic group) as terminal groups.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a novel fluororesin. This fluororesin is particularly useful as a lubricant. More specifically, the present invention relates to a fluororesin lubricant for a magnetic recording medium, particularly a medium useful for preventing data destruction of a recording medium due to friction between a magnetic disk medium and a head of a magnetic recording apparatus and wear, and And a magnetic disk using the lubricant.

[0002]

2. Description of the Related Art In recent years, in a magnetic disk drive, as a drive device start / stop method, a magnetic head is brought into contact with the surface of a disk of a magnetic recording medium when the drive device is stopped, and recording is performed as the drive device is driven. A contact start / stop (CS) in which the magnetic head is lifted by a certain amount from the disk surface by rotating the medium by a slider mechanism, and the magnetic head is brought into contact with the disk surface again by stopping the drive device.
The S) method has become mainstream. In the CSS method, when the magnetic disk comes into contact with the slider (head) for a long time, when the disk is restarted, the disk cannot be started due to high stiction, or the two come into contact and the magnetic The recorded data may be destroyed (head crash) or the head or the gimbal may be damaged. Since the surface roughness of the disk and the properties of the material greatly affect the generation of stiction, a specific fluorine-containing resin is formed on a protective film (generally, diamond-like carbon (DLC) or silicon dioxide) on the magnetic layer of the disk. It has been proposed to form a lubricant layer (U.S. Pat. No. 3,778,308, U.S. Pat.
238, U.S. Pat. No. 4,268,556).

The perfluororesin compound generally used as a lubricant for magnetic disks at present is designed to have a highly polar functional group at the end of the resin structure in order to increase the adhesion to the magnetic disk as a substrate. Have been. For example, it is known that an oxo acid group, a hydroxyl group, an ester group, or an ether group is directly bonded to a terminal of a perfluoro resin skeleton.

[0004]

In recent years, with the explosive popularization and high performance of personal computers, high recording density and high speed processing of magnetic disk drives have been accelerated.
Along with this, it is necessary to shorten (lower) the distance (flying height) between the head and the disk and to increase the rotation speed of the disk. In particular, notebook PCs and the like, which have been rapidly spreading recently, have various usage environments from high temperature and high humidity to low temperature and low humidity, and therefore, it is necessary to suppress stiction even in these environments. In order to meet these demands and to improve the performance of magnetic disk devices, in recent magnetic disk devices, the performance of lubricant on the disk surface has become more important than ever.

A major problem with the known magnetic disk lubricants is that they are designed to have a highly polar functional group at the end of the resin structure in order to increase the adhesion to the magnetic disk as a substrate. However, the adhesion to the disk actually obtained was insufficient, and the interaction between the terminal groups was large due to the large polarity of the terminal groups, so that the lubricant molecules were likely to aggregate.

When the lubricant is applied to the surface of the magnetic disk, the polar group at the terminal of the lubricant molecule is adsorbed on the disk surface, thereby maintaining the adhesion between the lubricant and the disk. However, in a lubricant having poor adhesion, a large amount of a mobile (mobile 1e) component that moves freely without being bonded to a disk is present in an upper layer portion of the applied lubricant. The layer of this component (mobile layer) is pushed out to the periphery of the disk by centrifugal force when the disk is rotated at high speed after the start of the magnetic disk device, causing a change in the film thickness in the radial direction of the disk and adhering to the head portion. This causes a head crash particularly when the flying height is reduced.

[0007] The aggregation of the lubricant causes deterioration of the film quality of a magnetic disk lubricating film which requires a uniform and ultra-thin film of one to several molecular layers. On magnetic disks, the uniformity of lubricant application is extremely important.If so-called uneven application occurs, the flying characteristics and friction characteristics of the head are degraded, causing a head crash. Impurities penetrate into the medium to cause corrosion of the magnetic material.

Further, conventional lubricants have low heat resistance,
There is also a problem that the lubricant is decomposed by heating during the manufacture of the magnetic disk or frictional heat generated when the disk is rotated at a high speed, and the decomposed product deteriorates the friction characteristics to cause a head crash.

Accordingly, the present invention provides a fluororesin which is suitable for use as a lubricant capable of supplying a lubricating film having high adhesion to the magnetic disk surface, low friction and abrasion, and excellent heat resistance. It is something to offer. Another object of the present invention is to provide a magnetic disk using the lubricant.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to improve the adhesion of a fluororesin-based lubricating film to the surface of a magnetic disk, and as a result, a specific functional group has been added to the fluorine resin terminal group. We have found that the above problem can be solved successfully by introducing it. In other words, as the terminal group, for example, oxo acid groups, hydroxyl groups, ester groups, ether groups, and other carboxyl groups, not polar groups such as formyl groups, but fluorine resins using non-polar groups as lubricants were used. It was found that the use of the lubricant greatly improved the adhesion of the lubricating film to the surface of the magnetic disk. Furthermore, it has been found that the number of π electrons present in the non-polar group greatly affects the adhesion of the lubricating film.

Therefore, the fluororesin of the present invention has a non-polar group as a terminal group (end cap group).

In one embodiment, the fluororesin of the present invention has a triorganosilyl group having no hydrolyzable or dehydrating condensable group as a terminal group. The triorganosilyl group here can be represented by the following general formula.

[0013]

Embedded image

In the formula, R ¹ , R ² and R ³ may be the same or different, and include an alkyl group, an alkenyl group,
Represents an aryl group, an aralkyl group, or a group obtained by substituting them with halogen or nitrogen.

Preferably, at least one of R ¹ , R ² and R ³ is an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, and an aralkyl group having 7 to 30 carbon atoms. Selected from.

Preferably, R ¹ , R ² and R ³ are phenyl or benzyl.

In another embodiment, the fluororesin of the present invention is represented by the following general formula and a total of eight or more π
It has a group having an electron as a terminal group.

[0018]

Embedded image

R ⁴ , R ⁵ and R ^{6 in} this formula may be the same or different and are H or an organic group,
^4, at least one of R ^5, R ⁶ is an organic group.

Preferably, the organic group may be an alkyl group, an alkenyl group, an aryl group, an aralkyl group, or a group obtained by substituting these with halogen or nitrogen.

Preferably, the terminal group has a total of 14 or more π electrons.

Preferably, the fluorine resin having a terminal group represented by the above formula (1) or (2) has a perfluoroether skeleton.

In still another aspect, the present invention provides a method for producing a fluororesin having a triorganosilyl group represented by the above general formula (1) as a terminal group. The fluororesin having a hydroxyl group at the terminal is silylated with chlorosilanes, silylamines or silylamides.

Preferably, a fluorine-containing resin having a hydroxyl group at a terminal and an amine catalyst are dissolved in a solvent having one or both of a CH bond and a CCl bond and having a CF bond, and triorganochlorosilane is added to perform silylation. To do.

In another aspect, the present invention provides a lubricant comprising any of the fluororesins described above.

In still another aspect, the present invention provides a magnetic disk having on its surface a lubricating film formed from the above lubricant.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The fluororesin of the present invention is characterized by having a non-polar group as a terminal group (end cap group).

A representative example of the non-polar group in the present invention is a triorganosilyl group. In general, when the terminal triorganosilyl group is hydrolysable due to the presence of an alkoxy group or the like, or is dehydration-condensable, the storage stability of the resin is reduced, so that the triorganosilyl group here is such It should not have any hydrolytic or dehydrating properties. The triorganosilyl group in the present invention can be represented by the following general formula.

[0029]

Embedded image

In the above formula, R ¹ , R ² and R ³ may be the same or different and include an alkyl group, an alkenyl group,
Represents an aryl group, an aralkyl group, or a group obtained by substituting them with halogen or nitrogen. As the alkyl group, those having 1 to 20 carbon atoms, for example, methyl, ethyl, propyl, butyl, hexyl, octyl, dodecyl and the like can be used. As the alkenyl group, those having 2 to 20 carbon atoms, for example, vinyl, allyl, isopropenyl, butenyl group and the like can be used. As the aryl group, one having 6 to 30 carbon atoms, for example, phenyl, naphthyl, anthryl group and the like can be used. As the aralkyl group, those having 7 to 30 carbon atoms,
For example, benzyl, diphenylmethyl, phenylethyl groups and the like can be used.

As described above, it has been found that the π electrons present in the terminal groups of the fluororesin are involved in the adhesion of the lubricating film to the magnetic disk. In the triorganosilyl group used as a group, at least one of the substituents R ¹ , R ² and R ³ preferably has π electrons, that is, R ¹ , R ² and R ³ Preferably, at least one of them is the above-mentioned alkenyl group, aryl group or aralkyl group. Generally, as the number of π electrons in the terminal group increases, the adhesion of the lubricating film formed by coating to the disk surface improves, but from the viewpoint of availability of substituents, more preferable substituents R ¹ , R ² and R ³ are a phenyl group or a benzyl group.

On the other hand, when R ¹ , R ² , and R ³ are all alkyl groups containing no π electrons, the lubricating film formed by applying a lubricant to the disk surface is heated or treated by radiation irradiation. By doing so, the adhesion of the lubricating film can be improved.

Another representative example of the nonpolar terminal group in the present invention is represented by the following general formula and has a total of 8 or more π electrons.

[0034]

Embedded image

R ⁴ , R ⁵ and R ^{6 in} this formula may be the same or different and are H or an organic group,
^4, at least one of R ^5, R ⁶ is an organic group. The organic group may be an alkyl group, an alkenyl group, an aryl group, an aralkyl group, or a group obtained by substituting these groups with halogen or nitrogen, and at least one of the organic groups has π electrons and is present in a terminal group. The total number of π electrons becomes 8 or more, preferably 14 or more. As the alkyl group, those having 1 to 20 carbon atoms, for example, methyl, ethyl, propyl, butyl, hexyl, octyl, dodecyl and the like can be used. As the alkenyl group, those having 2 to 20 carbon atoms, for example, vinyl, allyl, isopropenyl, butenyl group and the like can be used. As the aryl group, one having 6 to 30 carbon atoms, for example, phenyl, naphthyl, anthryl group and the like can be used. The aralkyl group has 7 to 30 carbon atoms.
For example, benzyl, diphenylmethyl, phenylethyl groups and the like can be used. Generally, as the number of π electrons in the terminal group increases, the adhesion of the lubricating film formed by coating to the disk surface improves, and the substituent R ⁴ ,
As R ⁵ and R ⁶ , the total number of π electrons in the terminal group is 8
A phenyl group, a benzyl group, a naphthyl group, an anthryl group, or the like can be preferably used provided that the number is at least.

The terminal group used in the fluororesin of the present invention may be a polar group (oxo acid group, hydroxyl group,
Unlike an ester group, an ether group, a carboxyl group, and a formyl group), the fluororesin of the present invention can avoid aggregation of the lubricant due to the action of the polar group since it has substantially no polarity. Further, the π electrons present in the terminal group of the fluororesin of the present invention can be lubricated without introducing the polar group as described above due to the interaction with the disk protective film (particularly, the protective film of diamond-like carbon). The adhesion of the film to the disk can be improved.

The skeleton of the fluororesin is not particularly limited, but a skeleton composed of carbon or a fluororesin having a skeleton containing oxygen in addition to carbon is preferable. Fluorine must be bonded to the skeleton carbon of the fluororesin, and besides fluorine, for example, hydrogen (H), chlorine (Cl), or an alkyl group having 1 to 5 carbon atoms may be bonded. Preferably, 50% or more of the substituents (including hydrogen) bonded to the skeleton carbon are fluorine. In the present invention, a fluororesin having a perfluoro skeleton or a perfluoroether skeleton can be preferably used. Particularly preferred fluororesins have a perfluoroether skeleton. The skeleton portion and the terminal group of the fluororesin are usually bonded via an oxygen (O) atom, but those having the skeleton portion and the terminal group bonded without an oxygen atom may also be used in the present invention. It falls into the resin category. Therefore, the fluorine resin in the present invention is:
The above-mentioned skeleton portion is represented by A, the terminal group is represented by E, and can be represented by the following formula. E-OA-OE (3) or E-A-E (4) Here, a linear structure fluororesin in which both ends are substituted with end caps (E) is mentioned. A terminal structure or a resin having a branched terminal can be similarly used.

After the lubricant is applied to the surface of the magnetic disk, the film thickness does not decrease over time due to volatilization and the like, and a part of the coating film is not lost as powdery fragments due to the action of friction during use. In order to form a lubricating film on a disk, the fluororesin of the present invention should have a molecular weight within a specific range. In order to satisfy the above conditions, generally, the fluororesin of the present invention preferably has a molecular weight of about 500 to 10,000, more preferably 1,000 to 5,000, and most preferably 2,000 to 3,000.

The fluororesin of the present invention is obtained by reacting a fluororesin having a reactive group such as a hydroxyl group (OH) at a terminal thereof with a substance having a specific group serving as a terminal group, so that the fluororesin has an appropriate terminal. It can be easily produced by introducing a terminal group. For example, a fluorine resin having a triorganosilyl terminal group represented by the above formula (1) can be obtained by replacing a fluorine resin having a hydroxyl group at a terminal with a chlorosilane, a silylamine, or a silylamide having a specific organic group serving as an appropriate terminal group. It can be easily produced by silylation with a compound or the like. In this case, in particular, a method of dissolving a fluorine resin having a hydroxyl group at a terminal and an amine catalyst in a solvent having one or both of a CH bond and a CCl bond and having a CF bond, and adding triorganochlorosilane for silylation. Can be preferably used. Preferred examples of the solvent satisfying the above conditions include 1,1-dichloro-2,2,3,3,3
-Pentafluoropropane and 1,3-dichloro-1,
In addition to a mixture with 1,2,2,3-pesitafluoropropane, HFE (hydrofluoroether) manufactured by 3M, Zeoror manufactured by Zeon Corporation (Zeoor)
a) and the like. As the amine catalyst, triethylamine, pyridine and the like can be used. The fluororesin having an organic terminal group represented by the above formula (2) can be obtained by dehydration-condensation reaction between a resin having a hydroxyl group at a terminal and a substance having a specific organic group which is an appropriate terminal group in the presence of an acid catalyst. By such a method, it can be easily manufactured.

When the fluororesin of the present invention is used as a lubricant, it can be dissolved in a solvent, and if necessary, an additive and a surfactant can be added to the lubricant to be applied to a magnetic disk. The application method is not particularly limited, but a dip coating method or a spin coating method can be preferably used. Further, the material of the surface to which the lubricant is applied is not particularly limited, but the lubricant of the present invention is a diamond-like carbon (D
LC) It is particularly preferred to coat the film. In particular, in the case of a high recording density magnetic disk, a DLC film having a thickness of 8 nm or less formed by CVD can be preferably used. The CVD film formation can supply a DLC film thinner than the sputter film formation, thereby shortening the magnetic spacing. However, since the obtained film is thin, migration of a metal such as a magnetic material under the DLC protective film is prevented. Frequency increases. Such a DLC
If a lubricant film is formed by applying the lubricant of the present invention on the film,
High adhesion to the DLC film is obtained. In addition, since this lubricating film has excellent covering properties and completely covers the underlying DLC film, it has a high effect of blocking contaminants derived from moisture and the like in the environment. Thus, it is possible to effectively exhibit the excellent corrosion resistance ability under high temperature and high humidity as compared with the case of using, and to supply a highly reliable high recording density magnetic disk.

The lubricating film as formed by applying the lubricant contains the mobile layer that is not completely bonded to the base as described above. This layer tends to gather around the disc due to the centrifugal force generated by the rotation of the disc,
This phenomenon becomes more and more remarkable particularly when a high-speed disk rotation is required as in a disk for high recording density. Since the adhesion of the lubricating film formed using the lubricant of the present invention to the base is high, the degree of movement of the mobile layer to the periphery of the disk is not so large, but particularly in the case of a high-speed rotating magnetic disk and a magnetic disk device. In addition, this phenomenon can trigger a troublesome problem. In the present invention, particularly in such a case, the lubricating film formed by applying the lubricant is subjected to crosslinking treatment by heating or irradiation, or both, to further improve the adhesion of the lubricating film to the base. Can be improved. Needless to say, this process is also effective for a disk rotating at a lower speed, which does not always require the adhesion required for a disk rotating at a high speed. This heating or irradiation treatment is carried out when R ¹ , R ² , and R ³ in the triorganosilyl terminal group represented by the general formula (1) are all alkyl groups containing no π electrons. As described above, it is particularly effective to improve the adhesion of the lubricating film formed on the disk surface.

FIG. 1 schematically shows a magnetic disk 10 of the present invention. The magnetic disk 10 has a base film 12, a magnetic material film 13, a protective film 14, and a lubricating film 1 on a substrate 11.
5 are sequentially formed. The substrate 11 is made of, for example, aluminum or glass. The base film 12 is made of Ni-P, Ni-Al, or the like. Magnetic material film 13
Is made of a metal such as Co or Cr, or an alloy containing these. The protective film 14 is generally a film of diamond-like carbon, and in some cases, silicon dioxide (SiO ₂ ) or the like may be used. Lubricating film 15
Is formed from the lubricant of the present invention. Both the structure and the constituent materials of such a magnetic disk are well-known, except for the lubricating film according to the present invention, and need not be described in detail here.

FIG. 2 shows the magnetic disk drive 20. This device 20 is provided with the magnetic disk 1 of the present invention described with reference to FIG.
0 or more is included. The disk 10 is rotatably driven by a drive device (not shown), and writing and reading of recording data is performed by a magnetic head 21 attached to a slider 23. The driving of the magnetic head is performed by the head driving device 22.
Made by The magnetic disk 10, the head 21, and the head driving device 22 are housed in an enclosure (not shown), and the magnetic disk device 20 is also connected to other devices by an interface (not shown). The configuration of such a magnetic disk drive is also well known, and need not be described in detail here.

[0044]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples.

Example 1 In this example, the synthesis of an elemental resin will be described. In a four-necked flask equipped with a reflux tower, a nitrogen bubbling tube, a stirring rod, and a dropping funnel, an equal amount of 1,1-dichloro-2, a perfluoropolyether having a terminal hydroxyl group (ZDOL4000s manufactured by Ausimont), which is a raw material, is placed. , 2,3,3,3-pentafluoropropane and 1,
After diluting with a mixed solution (AK-225 manufactured by Asahi Glass Co., Ltd.) with 3-dichloro-1,1,2,2,3-pecitafluoropropane, add 3 times mol of dehydrated pyridine to the terminal hydroxyl group, The mixture was stirred while bubbling with nitrogen at 50 ° C., and triphenylchlorosilane (TPh), whose mole was 3 times the terminal hydroxyl group, was diluted with 2 times the amount of AK-225 and added dropwise from the dropping funnel. The mixture was stirred to perform a silylation reaction. Next, wash with water until the reaction solution is neutral,
After further washing twice with butyl acetate, the solvent component was evaporated using a rotary evaporator, and the solution was filtered through a 0.1 μm membrane filter. Perform composition analysis by NMR,
It was confirmed that 98% of the hydroxyl groups of the perfluoropolyether were silylated.

Example 2 Instead of triphenylchlorosilane (TPh), which is a silylating agent of Example 1, tribenzylchlorosilane (TBz), allyldimethylchlorosilane (ADM), dimethylvinylchlorosilane (DM
V), trivinylchlorosilane (TVn), diphenylvinylchlorosilane (DPV), and triethylchlorosilane (TEt) were used to synthesize a fluororesin in the same manner as in Example 1. When composition analysis was performed by NMR, it was confirmed that 95% or more of the hydroxyl groups in all the resins were silylated.

Example 3 In order to examine the heat resistance of the fluororesins (seven kinds in total) synthesized in Examples 1 and 2, a thermal decomposition test of each resin was performed by thermogravimetric analysis. The measurement was performed in a nitrogen atmosphere at a heating rate of 20 ° C./min, and the temperature at the time of 5% weight loss is shown in Table 1. The resin terminal groups shown in the table correspond to the symbols of the silylating agent used for the silylation of the terminals. For example, the terminal groups of the resin silylated with triphenylchlorosilane (TPh) are indicated by TPh. .

[0048]

[Table 1]

Example 4 The fluororesins (7 types in total) synthesized in Examples 1 and 2 were dissolved in FC-77 solvent manufactured by Sumitomo 3M. The Ni-P plated aluminum plate is polished and textured to have a center line roughness (Ra) of 6.5.
A disk on which a Cr magnetic layer and a CoCrTa-based magnetic layer were formed in an Ar gas atmosphere by DC magnetron sputtering on a substrate having a thickness of 10 nm, and a diamond-like carbon (DLC) protective film (thickness: 8 nm) was formed by a CVD method. Prepared. To this, seven kinds of terminal-modified resin lubricants dissolved in the above-mentioned FC-77 solvent were respectively applied by dip coating to form films. For comparison, a lubricant was similarly formed on the disk using a fluorine resin having a hydroxyl group without denaturing the terminal. The film thickness of the lubricant on the disk was measured by an infrared absorption spectrum.
The mobile layer not bonded to the disk was dissolved and removed by immersion in a C-77 solvent, the film thickness was measured again, and the bond ratio (= film thickness after dissolution / initial film thickness) was measured. Further, the bonding ratio of the disk whose surface was entirely irradiated with a low-pressure mercury lamp for 5 seconds after the application of the lubricant was measured in the same manner. Table 2 shows the obtained results. The resin end groups shown in Table 2 correspond to the symbols of the silylating agent used in Table 1 as well. Also,
Table 2 also shows the number of π electrons present in the terminal group.

[0050]

[Table 2]

Example 5 A Ni-P-plated aluminum plate was polished, textured, and placed on a substrate having a center line roughness (Ra) of 5 nm by DC magnetron sputtering in an Ar gas cloud atmosphere. 5 magnetic layers
0 nm, a CoCrTa-based magnetic layer is sequentially formed to a thickness of 40 nm,
A disk having a DLC protective film formed thereon was prepared.
A crosslinked lubricating film (2.
(5 nm thick). Using a slider to which a thin film head made of a sintered body of alumina and TiC was attached, a slider flying height of 0.1% was obtained.
μm, 15 seconds operation at 3600 rpm
A cycle test was performed after stopping for 5 seconds, and the CSS (contact start / stop) characteristics were examined using a disk friction tester. The result was taken as the CS when the coefficient of friction reached 0.6.
Table 3 shows the number of S times.

[0052]

[Table 3]

The above is an example of the embodiment of the present invention. In addition, a magnetic disk device including a magnetic disk having a lubricating film formed from the lubricant of the present invention is also considered as an embodiment of the present invention.

[0054]

As described above, according to the present invention, the bonding ratio to the disk is high, the friction and abrasion are small, and the heat resistance is high. It has become possible to provide a fluororesin capable of supplying a high lubricating film. By using this resin as a lubricant for magnetic disks, it is possible to prevent film thickness fluctuations and head crashes during high-speed rotation of the disk due to the mobile layer of the lubricating film. A high magnetic disk and magnetic disk device can be supplied.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a magnetic disk of the present invention.

FIG. 2 is a diagram illustrating a magnetic disk drive.

[Explanation of symbols]

 10 magnetic disk 15 lubricating film 20 magnetic disk device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (reference) C10N 30:06 C10N 30:06 30:08 30:08 40:18 40:18 F term (reference) 4H104 BJ03A CJ13A LA03 LA04 LA13 PA16 4J005 BD08 5D006 AA01 DA03 FA04

Claims (12)

[Claims] 1. A fluororesin having, as a terminal group, a triorganosilyl group having no hydrolyzability or dehydration condensation represented by the following general formula. Embedded image (In the formula, R ¹ , R ² , and R ³ may be the same or different and represent an alkyl group, an alkenyl group, an aryl group, an aralkyl group, or a group obtained by substituting these with halogen or nitrogen.) 2. At least one of R ¹ , R ² and R ³ is an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 30 carbon atoms, and an aralkyl group having 7 to 30 carbon atoms. The fluororesin of claim 1, which is selected. 3. The fluororesin according to claim ¹ , wherein R ¹ , R ² and R ³ are a phenyl group or a benzyl group. 4. A fluororesin having a terminal group represented by the following general formula and having a total of 8 or more π electrons. Embedded image (In the formula, R ⁴ , R ⁵ , and R ⁶ may be the same or different and are H or an organic group, and R ⁴ , R ⁵ ,
At least one of R ⁶ is an organic group) 5. The fluororesin according to claim 4, wherein said organic group is selected from an alkyl group, an alkenyl group, an aryl group, an aralkyl group, and a group obtained by substituting these with halogen or nitrogen. 6. The fluororesin according to claim 4, wherein a total of 14 or more π electrons are present in said terminal group. 7. The fluororesin according to claim 1, wherein the fluororesin has a perfluoroether skeleton. 8. The following general formula: (In the formula, R ¹ , R ² , and R ³ may be the same or different and represent an alkyl group, an alkenyl group, an aryl group, an aralkyl group, or a group obtained by substituting these with halogen or nitrogen.) A method for producing a fluororesin having a triorganosilyl group as a terminal group represented by the formula: wherein the fluororesin having a hydroxyl group at the terminal is silylated with chlorosilane, silylamine or silylamide. 9. A fluorine-containing resin having a hydroxyl group at a terminal and an amine catalyst are dissolved in a solvent having one or both of a CH bond and a CCl bond and having a CF bond, and triorganochlorosilane is added thereto. The method according to claim 8, wherein the fluororesin having the following formula is silylated. 10. A lubricant comprising the fluororesin according to claim 1. Description: 11. A lubricant comprising a fluororesin having a triorganosilyl group having no hydrolyzability or dehydration condensation property as a terminal group. 12. A magnetic disk provided with a lubricating film formed from the lubricant according to claim 10 on its surface.