JP2003073346A - Perfluoropolyalkyl ether-based compound, lubricant composed of the compound and recording medium using the lubricant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lubricant for recording medium keeping excellent lubricating properties under various use conditions, maintaining lubricating effect for many hours and having excellent running properties, abrasion resistance and durability, etc. SOLUTION: For example, C18 H37 -CH(CH2 COOC4 H8 NH2 )COO-Rf-OCOCH(CH2 COOC4 H8 NH2 )-C18 H37 (Rf is a fluoropolyether group having 2,000 average molecular weight) is used as a lubricant for a magnetic recording medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perfluoropolyalkyl ether compound, a recording medium lubricant comprising the compound, and a recording medium on which a lubricating layer containing the lubricant is formed.

[0002]

2. Description of the Related Art A conventional recording medium, for example, a magnetic recording medium, is a so-called metal thin film type magnetic recording in which a ferromagnetic metal material is deposited on a non-magnetic support by a method such as vapor deposition and the magnetic layer is used as a magnetic layer. In a so-called coating type magnetic recording medium in which a medium or a magnetic coating material containing very fine magnetic particles and a resin binder is coated on a non-magnetic support, and the magnetic layer is used as a magnetic layer, the smoothness of the magnetic layer surface is Since it is extremely good, the substantial contact area with sliding members such as magnetic heads and guide rollers is large, so the friction coefficient is large and the adhesion phenomenon (so-called sticking) tends to occur, resulting in poor running performance and durability. There are many points. Therefore, use of various kinds of lubricants has been studied in order to improve these problems, and higher fatty acids and esters thereof have been conventionally added to the magnetic layer of the magnetic recording medium or top coated. Therefore, attempts have been made to suppress the coefficient of friction.

However, the lubricant used for the magnetic recording medium is required to have very strict characteristics due to its properties.
It is the current situation that it is difficult to deal with the conventional lubricants.

That is, the lubricant used for the magnetic recording medium is (1) excellent in low temperature characteristics so as to ensure a predetermined lubricating effect when used in cold regions, and (2) a lubricant with a magnetic head. As pacing becomes a problem, it is necessary to be able to apply it extremely thinly, to exhibit sufficient lubrication characteristics even in that case, and (3) to endure long-term use or long-term use and to maintain the lubrication effect. To be done.

Incidentally, Japanese Unexamined Patent Publication No. 6-41561 discloses that
As a lubricant for a metal thin film magnetic recording medium, a fluorine-containing alkyl succinate diester represented by the following general formula (i) has been proposed.

[0006]

[Chemical 4] R1-CH (COOR2) CH2COOR3 (i)

In the formula, R1 is an aliphatic alkyl group or an aliphatic alkenyl group, one of R2 and R3 is a fluoroalkyl ether group, and the other is a fluoroalkyl group,
It is either a fluoroalkenyl group, a fluorophenyl group, an aliphatic alkyl group, or an aliphatic alkenyl group. But,
The above-mentioned fluorine-containing alkyl succinate diester has a problem that it has a large friction coefficient.

[0008]

As described above, in the field of magnetic recording media, due to the lack of the ability of the lubricant used, the practical characteristics such as the level reduction of the reproduction output in the shuttle running test are unsatisfactory. Is left. Therefore, the present invention, while maintaining excellent lubricity under various use conditions, the lubricating effect is maintained for a long time, running property,
It is an object of the present invention to provide a magnetic recording medium having excellent wear resistance and durability.

[0009]

That is, the present invention provides the following general formula (1):

[0010]

[Chemical 5] R1-CH (CH2COOR2N (R3) R4) COO-Rf-OCOCH (CH2COOR2N (R3) R4) -R1 (1)

(In the formula, R1 represents a saturated aliphatic hydrocarbon group having 6 to 30 carbon atoms, and Rf has an average molecular weight of 500.
~ 6000 perfluoropolyether groups, R2
Represents a saturated hydrocarbon group having 1 to 30 carbon atoms, R
3 and R4 each represent a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 30 carbon atoms. And a perfluoropolyalkyl ether compound. The present invention also has the following general formula (1):

[0012]

[Chemical 6] R1-CH (CH2COOR2N (R3) R4) COO-Rf-OCOCH (CH2COOR2N (R3) R4) -R1 (1)

(In the formula, R1 represents a saturated aliphatic hydrocarbon group having 6 to 30 carbon atoms, and Rf has an average molecular weight of 500.
~ 6000 perfluoropolyether groups, R2
Represents a saturated hydrocarbon group having 1 to 30 carbon atoms, R
3 and R4 each represent a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 30 carbon atoms. And a perfluoropolyalkyl ether compound represented by the formula (1). Furthermore, the present invention is a recording medium comprising at least a recording layer and a lubricant layer made of a lubricant formed on a support, wherein the lubricant has the following general formula (1):

[0014]

[Chemical 7] R1-CH (CH2COOR2N (R3) R4) COO-Rf-OCOCH (CH2COOR2N (R3) R4) -R1 (1)

(In the formula, R1 represents a saturated aliphatic hydrocarbon group having 6 to 30 carbon atoms, and Rf has an average molecular weight of 500.
~ 6000 perfluoropolyether groups, R2
Represents a saturated hydrocarbon group having 1 to 30 carbon atoms, R
3 and R4 each represent a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 30 carbon atoms. The present invention provides a recording medium characterized by containing a perfluoropolyalkyl ether compound represented by (4).

The perfluoropolyalkyl ether compound of the present invention is a novel substance, and when used as a lubricant for recording media, especially for magnetic recording media, excellent lubricity is maintained under various usage conditions. With
It is possible to provide a recording medium in which the lubricating effect is maintained for a long time and which has excellent running properties, abrasion resistance, durability and the like.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the case where the compound of the present invention is used as a lubricant for a magnetic recording medium will be described as an example.

In the perfluoropolyalkyl ether compound of the present invention, R1 (hydrocarbon group) is
R1 has 6 to 30 carbon atoms, preferably 8 to 20 carbon atoms.
Is suitable, and if the carbon number is 5 or less, the solubility in the organic solvent decreases, and the lubricant film cannot be formed on the tape surface using the organic solvent. If the carbon number is 31 or more, the lubricant is applied to the tape surface. When applied, the solubility in the solvent decreases, and it becomes impossible to form a lubricating film on the tape surface. In R2, a carbon number of 1 to 30 is preferable, and a carbon number of 1 to 20 is suitable. If the carbon number is 31 or more, the solubility in a solvent when the lubricant is applied to the tape surface decreases. It becomes impossible to form a lubricating film on the tape surface. R3 and R4 each have a hydrogen atom or have 1 to 30 carbon atoms, preferably 1 to 30 carbon atoms.
Hydrocarbon groups of 20 are suitable, and if the number of carbon atoms is 31 or more, the solubility in a solvent when a lubricant is applied to the tape surface decreases, and a lubricant film cannot be formed on the tape surface. Generally, an amino group has a large polarity as a polar group,
Although the solubility in organic solvents is low, the materials with many hydrocarbon chains as described above greatly improve the solubility in organic solvents.

A suitable average molecular weight of Rf is 500 to 6000, preferably 1,000 to 4000. If the average molecular weight is less than 500, the friction coefficient is large because the perfluoropolyether group is too short, and the average molecular weight is 6000. When it is larger than the above range, the solubility in the organic solvent decreases, and it becomes impossible to form a lubricating film on the tape surface using the organic solvent.

The perfluoropolyalkyl ether compound of the present invention is obtained by mixing, for example, a succinic acid derivative containing the R1 group in the general formula (1) and a compound containing the perfluoroether (Rf) in the general formula (1). , 120 ℃
R2, R3 and a purified product obtained by removing impurities and unnecessary substances by heating with moderate temperature and reacting, washing with an organic solvent or an inorganic solvent, liquid washing with a separating funnel, purification using column chromatography, etc. , An R4 group-containing alcohol amine compound is reacted by heating and purified, whereby the compound can be easily synthesized.

As the compound containing the perfluoropolyether group (Rf) in the general formula (1), commercially available compounds can be used. For example, manufactured by Ausimont Co., Ltd., trade names Z-dol1000, Z-dol20
00, Z-dol 4000 and the like. Z-d
ol1000 is HOCH2 (CF2CF2O) m (CF2O) n as a structural formula.
A compound having an average molecular weight of 1000 containing CH2OH (Z
-Dol2000 and Z-dol4000 are Zd
Compound having the same structural formula as ol1000, but having an average molecular weight of 2000 and 4000, respectively).

Further, as described above, the perfluoropolyalkyl ether compound of the present invention can be suitably used as a lubricant for recording media, especially magnetic recording media. If necessary, various additives such as a rust preventive may be added to the lubricant. The rust preventive agent may be one used in conventional magnetic recording media, for example, phenols, naphthols, quinones, heterocyclic compounds containing nitrogen atom, heterocyclic compounds containing oxygen atom, sulfur. Examples thereof include heterocyclic compounds containing atoms.

The recording medium of the present invention comprises a lubricant layer containing the above-mentioned lubricant. For example, in the case of a magnetic recording medium, specifically, it is formed on a non-magnetic support by a method such as vapor deposition. A magnetic recording medium of a so-called metal thin film type in which a magnetic layer formed of the formed metal magnetic thin film, a carbon film, and a lubricant layer formed of the perfluoropolyether alkyl compound of the present invention are formed at least sequentially . Further, an underlayer may be formed between the non-magnetic support and the magnetic layer, if necessary.

The non-magnetic support is not particularly limited, and a known one can be used. For example,
When a rigid substrate such as an Al alloy plate or glass plate is used as the non-magnetic support, an oxide film such as alumite treatment or Ni-P film is formed on the substrate surface to harden the surface. May be. The metal magnetic thin film forming the magnetic layer is not particularly limited, and known ones can be used. For example, it is formed as a continuous film by a PVD method such as plating, sputtering, vacuum deposition, etc., and metals such as Fe, Co and Ni, Co-Ni alloys, Co-Pt alloys, Co-Pt-Ni alloys are used. Alloy, Fe
-Co alloy, Fe-Ni alloy, Fe-Co-Ni alloy, Fe-Ni-B alloy, Fe-Co-B alloy,
In-plane magnetization recording metal magnetic films made of Fe-Co-Ni-B type alloys, Co-Cr type alloy thin films and the like can be mentioned. In particular, in the case of in-plane magnetization recording metal magnetic thin film, Bi, Sb, Pb, Sn, Ga, In, Ge,
An underlayer of a low-melting point non-magnetic material such as Si or Tl is formed in advance, and a metallic magnetic material is vapor-deposited or sputtered in the vertical direction to diffuse these low-melting point non-magnetic material into the metallic magnetic thin film, thereby eliminating the orientation. The in-plane isotropy may be ensured and the anti-magnetism may be improved.

As a method for forming the carbon film, sputtering is generally used, but the method is not particularly limited, and any method can be used. In this case, the thickness of the carbon film is preferably 2 to 100 nm, more preferably 5 to 30 nm.

The lubricant layer can be formed by topcoating the carbon film with a lubricant by a conventional method. The amount of lubricant applied is, for example, 0.5 to 100 mg / m.
² is preferable, and 1 to 20 mg / m ² is more preferable. For application, a lubricant dissolved in an organic solvent such as hexane can be used. When using rust preventives,
Although it may be combined with a lubricant, it is preferable to apply a rust preventive agent on the carbon film and then apply a lubricant to provide two or more layers, because the rust preventive effect is enhanced.

The perfluoropolyalkyl ether compound of the present invention is preferably used as a lubricant for recording media, especially magnetic recording media as described above. However, the lubricant of the present invention can be applied not only to magnetic recording media but also to optical recording media, and its support is not limited to tapes and can be used for recording media such as disk media such as magnetic disks and optical disks. .

[0028]

In the conventional lubricant, a compound having a relatively large polarity such as carboxylic acid or amine has a small friction coefficient, but has a tendency to have poor still durability, and a compound having a relatively small polarity such as an ester is a still compound. It has excellent durability, but has a large friction coefficient. Since the perfluoropolyalkyl ether compound of the present invention has an ester group having a relatively weak polarity and also has an amine group having a strong polarity, the adsorptivity to the carbon film surface is strong, and Since it also has fluidity, it has a small coefficient of friction, and exhibits excellent still durability and shuttle durability. Also,
Since the carbon protective film on the tape surface shows an acidic surface,
It is known that the perfluoropolyalkyl ether compound of the present invention has an amine group in the molecule and thus strongly adsorbs to the surface. In particular, when the perfluoropolyalkyl ether compound of the present invention is applied as a lubricant on a carbon film, two amine groups of the general formula (1) in the polar base of the lubricant molecule are strongly adsorbed on the carbon film, resulting in a hydrophobic property. Due to the cohesive force between the groups and the fluidity of the ester group, a lubricant layer having good durability can be formed. Further, while a fluorine-based solvent is indispensable for coating a conventional fluorine-containing lubricant, the perfluoropolyalkyl ether-based compound of the present invention may be coated with a hydrocarbon-based solvent such as toluene or acetone. Since it is possible, it is preferable that the load on the environment is small. As described above, the magnetic recording medium using the perfluoropolyalkyl ether compound of the present invention as a lubricant has excellent lubricity under various conditions of use and has a long-lasting lubricating effect. It is possible to provide runnability, wear resistance, durability and the like.

[0029]

EXAMPLES The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

Synthesis Example 1 of Perfluoropolyalkylether Compound of the Present Invention Using octadecyl succinic anhydride as the succinic acid derivative containing the R1 group in the general formula (1), the perfluoropolyether group in the general formula (1) is used. Z-dol2000 is used as the compound containing (Rf), and 2-amino-1-propanol is used as the amine compound containing the R2, R3, and R4 groups in the general formula (1), and the perfluoropolyalkyl ether compound of the present invention is used. The compound was synthesized. The synthetic procedure is shown below.

Octadecyl succinic anhydride C18H37C4H3O3
10.0 g and Z-dol 2000 28.4 g were mixed and refluxed at 120 ° C. for 3 hours. After the reaction was completed, the reaction product was dissolved in 200 ml of toluene, 300 ml of 10% NaOH aqueous solution was added, and the mixture was vigorously shaken. The produced white solid (Na salt of the target product) was suction filtered with a glass filter. Furthermore, 240 ml of water twice, 200 ml of toluene once,
The white solid was washed on a glass filter. By this operation, the starting material octadecyl succinic anhydride could be removed. Next, the white solid is put into a separating funnel, and toluene 30
0 ml and 300 ml of hydrochloric acid were added for liquid separation washing and desalting. Furthermore, 300 ml of hydrochloric acid is added twice, and an aqueous solution of sodium chloride is added twice
The solution was washed once with liquid separation, the toluene phase was recovered, and dried with magnesium sulfate. After 1 hour, it was filtered and the toluene phase was concentrated. Subsequently, the recovered product was purified by column chromatography. The column conditions are column packing: silica gel, column temperature: normal temperature, eluent: toluene and a mixed solvent of 10% ethyl acetate and 90% toluene. The target substance is eluted when a mixed solvent of 10% ethyl acetate and 90% toluene is used. The recovered amount was 19 g. IR analysis of the recovered product revealed that it had the general formula C18H37-CH (CH2COOH) COO-Rf-OCOC.
It was found to have H (CH2COOH) -C18H37 (Rf is a perfluoropolyether group with an average molecular weight of 2000).

Furthermore, purified C18H37-CH (CH2COOH) COO
1.6 g of 2-amino-1-propanol was added to 1919 g of -Rf-OCOCH (CH2COOH) -C18H, and the mixture was heated and mixed for 2 hours. After completion of the reaction, the reaction product was dissolved in 200 ml of toluene, and washed with 300 ml of 10% NaOH aqueous solution twice and twice with sodium chloride aqueous solution in a separatory funnel to separate and wash, and the toluene phase was recovered and dried with magnesium sulfate. It was After 1 hour, it was filtered and the toluene phase was concentrated. Subsequently, the recovered product was purified by column chromatography. The column conditions are column packing: silica gel, column temperature: normal temperature, eluent: toluene and a mixed solvent of 10% ethyl acetate and 90% toluene. The target substance is eluted when a mixed solvent of 10% ethyl acetate and 90% toluene is used. IR analysis of the recovered material revealed that it had the general formula C18H37-CH (CH2COOC4H8NH2) COO-Rf-OCOCH.
It was found to have (CH2COOC4H8NH2) -C18H37. The recovered product was 20.1 g, and the recovery rate was about 80%. IR analysis of the recovered product revealed that it had the general formula C18H37-CH (CH2COOC4
H8NH2) COO-Rf-OCOCH (CH2COOC4H8NH2) -C18H37.

Synthetic Example 2 of Perfluoropolyalkylether Compound of the Present Invention Using octadecyl succinic anhydride as the succinic acid derivative containing the R1 group in the general formula (1), the perfluoropolyether group in the general formula (1) is used. Z-dol2000 is used as the compound containing (Rf), and 3-diethylamino-1-propanol is used as the amine compound containing the R2, R3, and R4 groups in the general formula (1), and the perfluoropolyalkyl ether compound of the present invention is used. The compound was synthesized. The synthetic procedure is shown below.

Octadecyl succinic anhydride C18H37C4H3O3
10.0 g and Z-dol 2000 28.4 g were mixed and refluxed at 120 ° C. for 3 hours. After the reaction was completed, the reaction product was dissolved in 200 ml of toluene, 300 ml of 10% NaOH aqueous solution was added, and the mixture was vigorously shaken. The produced white solid (Na salt of the target product) was suction filtered with a glass filter. Furthermore, 240 ml of water twice, 200 ml of toluene once,
The white solid was washed on a glass filter. By this operation, the starting material octadecyl succinic anhydride could be removed. Next, the white solid is put into a separating funnel, and toluene 30
0 ml and 300 ml of hydrochloric acid were added for liquid separation washing and desalting. Furthermore, 300 ml of hydrochloric acid is added twice, and an aqueous solution of sodium chloride is added twice
The solution was washed once with liquid separation, the toluene phase was recovered, and dried with magnesium sulfate. After 1 hour, it was filtered and the toluene phase was concentrated. Subsequently, the recovered product was purified by column chromatography. The column conditions are column packing: silica gel, column temperature: normal temperature, eluent: toluene and a mixed solvent of 10% ethyl acetate and 90% toluene. The target substance is eluted when a mixed solvent of 10% ethyl acetate and 90% toluene is used. The recovered amount was 19 g. IR analysis of the recovered material revealed that it had the general formula C18H37-CH (CH2COOH) COO-Rf-OCOCH.
It was found to have (CH2COOH) -C18H37 (Rf is a perfluoropolyether group with an average molecular weight of 2000).

Further, purified C18H37-CH (CH2COOH) COO-
Rf-OCOCH (CH2COOH) -C18H37 19 g 3-diethylamino-
2.3 g of 1-propanol was added, and the mixture was heated and mixed for 2 hours. After completion of the reaction, the reaction product was dissolved in 200 ml of toluene, and 300 ml of 10% NaOH aqueous solution was used twice in a separatory funnel,
The layers were separated and washed twice with an aqueous sodium chloride solution, and the toluene phase was recovered and dried over magnesium sulfate. One hour later,
It was filtered and the toluene phase was concentrated. Subsequently, the recovered product was purified by column chromatography. The column condition is
Column packing: silica gel, column temperature: normal temperature, eluent: mixed solvent of toluene and ethyl acetate 10% toluene 90%. The target product is ethyl acetate 10% toluene 9
Elute when using 0% mixed solvent. IR analysis of the recovered product revealed that it had the general formula C18H37-CH (CH2COOC3H6N (CH3) 2) CO.
It was found to have O-Rf-OCOCH (CH2COOC3H6N (CH3) 2) -C18H37. The recovered product is 20.1g, and the recovery rate is about 80%.
Met. IR analysis of the recovered material revealed that it had the general formula C18H37.
-CH (CH2COOC3H6N (CH3) 2) COO-Rf-OCO CH (CH2COOC3H6N (CH
3) It was found to have 2) -C18H37.

If a method similar to the above is adopted, the R1 group in formula (1), any perfluoropolyether group (Rf), and R2, R3, and R4 groups can be arbitrarily set, and the A fluoropolyalkyl ether compound can be synthesized. Specific examples thereof are shown in Table 1 below.

[0037]

[Table 1]

Examples 1 to 30 Perfluoropolyalkyl ether compounds of the present invention were synthesized by using the raw materials shown in Table 2 below in the same manner as in the above-mentioned synthesis example, and the compounds were subjected to the following tests as lubricants.

[0039]

[Table 2]

Comparative Examples 1 to 5 The compounds having the structures shown in Table 3 below were used as lubricants and subjected to the following tests.

[0041]

[Table 3]

Preparation of sample tape Co was adhered to a 7.0 μm thick polyethylene terephthalate film by the above-mentioned oblique vapor deposition method to give a film thickness of 180 n.
m metal magnetic thin film was formed. Then, a carbon protective film having a thickness of about 8 nm was formed on the metal magnetic thin film by using the magnetron sputtering device described above. Then, a 0.5 μm thick back coat layer made of carbon and polyurethane resin was formed on the surface of the polyethylene terephthalate film opposite to the surface on which the metal magnetic thin film was formed.
Next, the compounds shown in Tables 1 or 2 and 3 were dissolved in a toluene solvent and applied onto the surface of the carbon protective film so that the coating amount was 5 mg / m ² . The obtained magnetic recording medium was cut into a width of 6.35 mm to prepare a sample tape as an example.

Evaluation of Durability and Runnability Using each of the sample tapes produced as described above,
The coefficient of friction was calculated as follows: temperature -40, humidity 80%
Still durability was measured under the conditions of ° C and shuttle durability under the conditions of temperature of 40 ° C and humidity of 20%. The results are shown in Table 4.
Shown in. In the evaluation by the present inventors, the environmental conditions for each measurement were determined because the above environmental conditions are the most severe environmental conditions. A commercially available digital video camcorder (VX1000 manufactured by Sony) was used for measuring the still durability and the shuttle durability.

(1) Friction coefficient measuring method The friction coefficient was measured in a constant temperature bath at a temperature of 40 ° C. and a humidity of 80%.
The sample tape was run for 100 passes under the control of RH and measured. The numerical value at the 100th pass of friction running is shown in the table as a friction coefficient. (2) Still Durability Measurement Method The still durability was measured in a constant temperature bath at -5 ° C, and the time until the reproduction output dropped by 3 dB was measured. (3) Shuttle durability measurement method Shuttle durability is measured at a temperature of 40 ° C and a humidity of 20% R in a constant temperature bath.
The sample tape was controlled to H, the sample tape was run for 60 minutes on a 100-path shuttle, and after the 100-path was run, how much dB the reproduction output dropped from the initial output was measured.

Evaluation of Solubility in Solvents The lubricants used in Examples 1 to 30 and Comparative Example 3 were examined for solubility in ethanol, acetone and toluene. In the evaluation, when the lubricant was insoluble in each solvent, the lubricant was insoluble in the solvent was rated as x. Table 5 shows the results of the solubility evaluation of each lubricant.

[0046]

[Table 4]

[0047]

[Table 5]

From the above results, by using the perfluoropolyalkyl ether compound of the present invention as a lubricant for magnetic recording media, it is possible to obtain a friction coefficient and a stillness under various use conditions such as high temperature and high humidity, high temperature and low humidity, and low temperature. It can be seen that the deterioration of durability or shuttle durability was extremely small, and very good results were obtained.

[0049]

The perfluoropolyalkyl ether compound of the present invention is useful as a lubricant for recording media, especially magnetic recording media. In particular, in a magnetic recording medium in which a magnetic layer, a carbon film layer, and a lubricant layer made of a lubricant are sequentially formed on a non-magnetic support, the above-mentioned perfluoropolyalkyl ether compound is used as a lubricant. For example, it is possible to obtain a magnetic recording medium capable of maintaining excellent lubricity under various conditions, maintaining a lubricating effect for a long time, and providing excellent running properties, abrasion resistance, durability and the like.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 5/725 G11B 5/725 // C08L 71:00 C08L 71:00 Z C10N 30:00 C10N 30:00 Z 30:06 30:06 40:18 40:18 (72) Inventor Noriyuki Kishii 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Hiroshi Iwamoto Kita-Shinagawa, Shinagawa-ku, Tokyo 6-735 Sony Corporation (72) Inventor Toshinori Tsuboi 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 4F006 AA35 AB32 CA02 DA01 DA04 4H006 AA01 AA03 AB60 BM10 BM71 BT12 BU32 4H104 BE02A CE19A LA03 LA20 PA16 4J005 AA00 BD02 BD05 5D006 AA01 EA02 EA03 FA02 FA05 FA06

Claims (4)

[Claims] 1. The following general formula (1): embedded image R1-CH (CH2COOR2N (R3) R4) COO-Rf-OCOCH (CH2COOR2N (R3) R4) -R1 (1) (wherein R1 is The carbon atom represents a saturated aliphatic hydrocarbon group having 6 to 30, Rf represents a perfluoropolyether group having an average molecular weight of 500 to 6000, and R2 represents a saturated hydrocarbon group having 1 to 30 carbon atoms. And R3 and R4 each represent a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 30 carbon atoms.), A perfluoropolyalkyl ether compound. 2. The following general formula (1): embedded image R1-CH (CH2COOR2N (R3) R4) COO-Rf-OCOCH (CH2COOR2N (R3) R4) -R1 (1) (wherein R1 is The carbon atom represents a saturated aliphatic hydrocarbon group having 6 to 30, Rf represents a perfluoropolyether group having an average molecular weight of 500 to 6000, and R2 represents a saturated hydrocarbon group having 1 to 30 carbon atoms. And R3 and R4 each represent a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 30 carbon atoms). . 3. A recording medium in which at least a recording layer and a lubricant layer made of a lubricant are formed on a support, wherein the lubricant has the following general formula (1): CH (CH2COOR2N (R3) R4) COO-Rf-OCOCH (CH2COOR2N (R3) R4) -R1 (1) In the formula, R1 represents a saturated aliphatic hydrocarbon group having 6 to 30 carbon atoms, and Rf is It shows a perfluoropolyether group having an average molecular weight of 500 to 6000, and R2 is a carbon atom.
1 to 30 represents a saturated hydrocarbon group, and R3 and R4 represent a hydrogen atom or a saturated aliphatic hydrocarbon group having 1 to 30 carbon atoms. ) A recording medium comprising a perfluoropolyalkyl ether compound represented by 4. The recording medium according to claim 3, wherein the recording layer is a magnetic layer, and the recording medium is a magnetic recording medium.