JPH05258287A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH05258287A JPH05258287A JP8801492A JP8801492A JPH05258287A JP H05258287 A JPH05258287 A JP H05258287A JP 8801492 A JP8801492 A JP 8801492A JP 8801492 A JP8801492 A JP 8801492A JP H05258287 A JPH05258287 A JP H05258287A
- Authority
- JP
- Japan
- Prior art keywords
- fluorinated polyether
- ferromagnetic metal
- magnetic recording
- recording medium
- thin film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Magnetic Record Carriers (AREA)
- Lubricants (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は強磁性金属薄膜層を記
録層とする磁気記録媒体に関し、さらに詳しくは、走行
性および耐久性に優れた前記の磁気記録媒体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium having a ferromagnetic metal thin film layer as a recording layer, and more particularly to the above magnetic recording medium excellent in running property and durability.
【０００２】[0002]
【従来の技術】一般に、強磁性金属またはそれらの合金
などを真空蒸着等によって非磁性基体フィルム上に被着
してつくられる強磁性金属薄膜型磁気記録媒体は、高記
録密度特性に優れる反面、記録再生時に磁気ヘッド等と
激しく摺接する際の磁気ヘッドとの摩擦係数が大きく
て、強磁性金属薄膜層が摩耗や損傷を受け易いといった
難点がある。このため、強磁性金属薄膜層上に脂肪酸、
脂肪酸エステルなどの脂肪族化合物またはパ−フルオロ
アルキルポリエ−テルなどのフッ素系化合物からなる保
護層を設けて摩擦係数を低減し、走行性および耐久性を
改善することが行われている。（特公昭５６−３０６０
９号、特公昭６０−１０３６８号、特開昭６０−１０９
０２８号、特開平２−４９２１８号、特開平２−７８０
１６号）2. Description of the Related Art In general, a ferromagnetic metal thin film type magnetic recording medium produced by depositing a ferromagnetic metal or an alloy thereof on a non-magnetic substrate film by vacuum deposition or the like is excellent in high recording density characteristics, There is a drawback that the coefficient of friction with the magnetic head is large when it is in sliding contact with the magnetic head or the like during recording and reproduction, and the ferromagnetic metal thin film layer is easily worn or damaged. Therefore, fatty acid on the ferromagnetic metal thin film layer,
A protective layer made of an aliphatic compound such as a fatty acid ester or a fluorine-based compound such as perfluoroalkylpolyether is provided to reduce the coefficient of friction and improve the running property and durability. (Japanese Patent Publication Sho 56-3060
No. 9, JP-B-60-10368, JP-A-60-109.
No. 028, JP-A-2-49218, and JP-A-2-780.
No. 16)
【０００３】[0003]
【発明が解決しようとする課題】ところが、従来から使
用されているこれらの脂肪族化合物では強磁性金属薄膜
層と磁気ヘッドとの摩擦係数を充分に低減させることが
できず、またパ−フルオロアルキルポリエ−テルなどの
フッ素系化合物は有機溶剤との親和性が乏しくて、強磁
性金属薄膜層の表面に均一に保持することが難しく、未
だ充分な走行性および耐久性が得られていない。However, with these conventionally used aliphatic compounds, the friction coefficient between the ferromagnetic metal thin film layer and the magnetic head cannot be sufficiently reduced, and perfluoroalkyl is not used. Fluorine-based compounds such as polyether have a poor affinity with organic solvents, and it is difficult to uniformly hold them on the surface of the ferromagnetic metal thin film layer, and sufficient runnability and durability have not been obtained yet.
【０００４】[0004]
【課題を解決するための手段】この発明はかかる現状に
鑑み、種々検討を行った結果なされたもので、強磁性金
属薄膜層の表面に、潤滑剤成分として、 −Ｃm Ｆ2mＯ−単位（但し、ｍは１〜１８の整数であ
る。） を基本骨格とするフッ素化ポリエ−テルの少なくとも一
つの末端に、一般式 −（ＯＣＨ2 ＣＨ2 ）n ＯＨ（但し、ｎは１〜３０の整
数である。） で表される極性基を有する分子量が５００〜１００００
のフッ素化ポリエ−テルを存在させることによって、走
行性及び耐久性を充分に向上させたものである。SUMMARY OF THE INVENTION This invention has been made in consideration of the above circumstances, has been made a result of various investigations, the surface of the ferromagnetic metal thin film layer, as a lubricant component, -C m F 2m O-units (Provided that m is an integer of 1 to 18) is added to at least one terminal of a fluorinated polyether having a basic skeleton of the general formula — (OCH 2 CH 2 ) n OH (where n is 1 to 30). Of the polar group represented by the formula: 500 to 10,000.
By the presence of the fluorinated polyether, the running property and durability are sufficiently improved.
【０００５】この発明において、前記の極性基を有する
フッ素化ポリエ−テルは、フッ素化ポリエ−テルの少な
くとも一つの末端に−（ＯＣＨ2 ＣＨ2 ）n ＯＨを有す
るため、分子鎖の回転の自由度が増し、流動性が向上す
る。その結果、有機溶剤との親和性がよくなり、強磁性
金属薄膜層の表面に均一に保持されて、磁気ヘッドとの
強い摺接に耐え、その優れた潤滑効果が充分に発揮され
る。従って、この種の極性基を有するフッ素化ポリエ−
テルを強磁性金属薄膜層の表面に存在させると、その優
れた潤滑効果が充分に発揮され、走行性および耐久性が
充分に向上される。In the present invention, the above-mentioned fluorinated polyether having a polar group has-(OCH 2 CH 2 ) n OH at least at one end of the fluorinated polyether, and therefore the molecular chain is free to rotate. The degree is increased and the liquidity is improved. As a result, the affinity with the organic solvent is improved, the ferromagnetic metal thin film is uniformly held on the surface of the thin film, withstands a strong sliding contact with the magnetic head, and exhibits its excellent lubricating effect. Therefore, a fluorinated polyester having this type of polar group
When tellur is present on the surface of the ferromagnetic metal thin film layer, its excellent lubricating effect is sufficiently exerted, and the running property and durability are sufficiently improved.
【０００６】このような極性基を有するフッ素化ポリエ
−テルは、極性基のｎが１〜３０であることが好まし
く、炭素数が少ないとフッ素化ポリエ−テルの溶剤に対
する溶解性が低下し、炭素数が多いほどフッ素化ポリエ
−テルの溶剤に対する溶解性が向上するが、多すぎると
融点が高くなり、低温における特性が悪くなる。また、
この極性基を有するフッ素化ポリエ−テルの分子量は、
５００〜１００００の範囲内であることが好ましく、分
子量が小さすぎると潤滑特性が不充分であり、大きすぎ
ると有機溶剤に対する溶解性が低下する。In the fluorinated polyether having such a polar group, it is preferable that n of the polar group is 1 to 30, and if the carbon number is small, the solubility of the fluorinated polyether in a solvent is lowered, As the number of carbon atoms increases, the solubility of the fluorinated polyether in the solvent improves, but when it is too large, the melting point increases and the characteristics at low temperatures deteriorate. Also,
The molecular weight of the fluorinated polyether having this polar group is
It is preferably in the range of 500 to 10,000, and if the molecular weight is too small, the lubricating properties will be insufficient, and if it is too large, the solubility in organic solvents will decrease.
【０００７】このような極性基を有するフッ素化ポリエ
−テルを強磁性金属薄膜層の表面に存在させるには、こ
の種の極性基を有するフッ素化ポリエ−テルを、メチル
エチルケトン、ｎ−ヘキサン、イソプロピルアルコ−ル
などの有機溶剤に溶解し、この溶解によって得られた溶
液中に強磁性金属薄膜層を浸漬するか、もしくはこの溶
液を強磁性金属薄膜層上に塗布または噴霧して強磁性金
属薄膜層上に被着するなどの方法で行われる。被着量
は、 0.5ｍｇ／ｍ2 より少なくては所期の効果が得られ
ず、２０ｍｇ／ｍ2 より多いと出力低下やドロップアウ
トの原因になるため、 0.5〜２０ｍｇ／ｍ2 の範囲内で
被着させるのが好ましい。In order to allow such a fluorinated polyether having a polar group to exist on the surface of the ferromagnetic metal thin film layer, a fluorinated polyether having such a polar group is added to methyl ethyl ketone, n-hexane or isopropyl. A ferromagnetic metal thin film is prepared by dissolving it in an organic solvent such as alcohol and immersing the ferromagnetic metal thin film layer in a solution obtained by this dissolution, or by coating or spraying this solution on the ferromagnetic metal thin film layer. It is carried out by a method such as depositing on the layer. The Chakuryou is less than 0.5 mg / m 2 can not be obtained the desired effect, since this may result in large output decreases and dropouts than 20 mg / m 2, in the range of 0.5-20 / m 2 It is preferable to apply it.
【０００８】強磁性金属薄膜層は、Ｃｏ−Ｎｉ合金、Ｃ
ｏ−Ｎｉ−Ｐなどの強磁性材を真空蒸着、イオンプレ−
ティング、スパッタリング、メッキ等の手段によって基
体上に被着するなどの方法で形成される。The ferromagnetic metal thin film layer is a Co--Ni alloy, C
Vacuum deposition of ferromagnetic materials such as o-Ni-P
It is formed by a method such as coating on a substrate by means of coating, sputtering, plating or the like.
【０００９】また、磁気記録媒体としては、ポリエステ
ルフィルムなどの合成樹脂フィルムを基体とする磁気テ
−プ、円盤やドラムを基体とする磁気ディスクや磁気ド
ラムなど、磁気ヘッドと摺接する構造の種々の形態のも
のが包含される。As the magnetic recording medium, there are various magnetic tapes such as a magnetic tape having a synthetic resin film such as a polyester film as a base, a magnetic disk having a disk or a drum as a base, and a magnetic drum having a structure in sliding contact with a magnetic head. Forms are included.
【００１０】[0010]
【実施例】次に、この発明の実施例について説明する。 実施例１ 厚さ１０μｍのポリエチレンテレフタレ−トフィルムを
真空蒸着装置に充填し、酸素ガス圧５×１０-5ト−ルの
残留ガス圧の下で、Ｃｏ−Ｎｉ合金を加熱蒸発させ、連
続的に斜め入射蒸着して、ポリエチレンテレフタレ−ト
フィルム上に、Ｃｏ−Ｎｉ−Ｏ（Ｃｏ：Ｎｉ＝８０：２
０）からなる厚さ 0.2μｍの強磁性金属薄膜を形成し
た。次いで、これを下記の式で表される平均分子量が３
０００のパ−フルオロポリエ−テルの 0.2重量％メチル
エチルケトン溶液中に浸漬し、乾燥して保護層を形成
し、８ミリ幅にスリットしてビデオテ−プを作製した。 EXAMPLES Next, examples of the present invention will be described. Example 1 A polyethylene terephthalate film having a thickness of 10 μm was filled in a vacuum evaporation apparatus, and a Co—Ni alloy was heated and evaporated continuously under a residual gas pressure of 5 × 10 −5 torr of oxygen gas to continuously evaporate the film. Is obliquely incident and vapor-deposited on a polyethylene terephthalate film to form Co-Ni-O (Co: Ni = 80: 2).
A ferromagnetic metal thin film of 0) having a thickness of 0.2 μm was formed. Next, the average molecular weight represented by the following formula is 3
000 perfluoropolyether in 0.2 wt% methyl ethyl ketone solution was dipped, dried to form a protective layer, and slit to 8 mm width to make a video tape.
【００１１】実施例２ 実施例１における保護層の形成において、実施例１で使
用したパ−フルオロポリエ−テルの 0.2重量％メチルエ
チルケトン溶液に代えて、下記の式で表される平均分子
量が３０００のパ−フルオロポリエ−テルの 0.2重量％
メチルエチルケトン溶液を用いた以外は、実施例１と同
様にして保護層を形成し、ビデオテ−プを作製した。 ＣＦ3(ＯＣＦ2 ＣＦ2 ＣＦ2)15ＣＦ2 ＣＦ2 ＣＨ2(ＯＣ
Ｈ2 ＣＨ2)10ＯＨExample 2 In the formation of the protective layer in Example 1, the 0.2% by weight methyl ethyl ketone solution of perfluoropolyether used in Example 1 was replaced with an average molecular weight of 3000 represented by the following formula. 0.2% by weight of perfluoropolyether
A protective layer was formed in the same manner as in Example 1 except that the methyl ethyl ketone solution was used to prepare a video tape. CF 3 (OCF 2 CF 2 CF 2 ) 15 CF 2 CF 2 CH 2 (OC
H 2 CH 2 ) 10 OH
【００１２】実施例３ 実施例１における保護層の形成において、実施例１で使
用したパ−フルオロポリエ−テルの 0.2重量％メチルエ
チルケトン溶液に代えて、下記の式で表される平均分子
量が３０００のパ−フルオロポリエ−テルの 0.2重量％
メチルエチルケトン溶液を用いた以外は、実施例１と同
様にして保護層を形成し、ビデオテ−プを作製した。 ＣＦ3 〔ＣＦ（ＣＦ3)ＣＦ2 Ｏ〕15ＣＦ（ＣＦ3)ＣＨ
2(ＯＣＨ2 ＣＨ2)10ＯＨExample 3 In the formation of the protective layer in Example 1, the 0.2% by weight methyl ethyl ketone solution of perfluoropolyether used in Example 1 was replaced with an average molecular weight of 3000 represented by the following formula. 0.2% by weight of perfluoropolyether
A protective layer was formed in the same manner as in Example 1 except that the methyl ethyl ketone solution was used to prepare a video tape. CF 3 [CF (CF 3 ) CF 2 O] 15 CF (CF 3 ) CH
2 (OCH 2 CH 2 ) 10 OH
【００１３】実施例４ 実施例１における保護層の形成において、実施例１で使
用したパ−フルオロポリエ−テルの 0.2重量％メチルエ
チルケトン溶液に代えて、下記の式で表される平均分子
量が２３００のパ−フルオロポリエ−テルの 0.2重量％
メチルエチルケトン溶液を用いた以外は、実施例１と同
様にして保護層を形成し、ビデオテ−プを作製した。 Example 4 In the formation of the protective layer in Example 1, the 0.2% by weight methyl ethyl ketone solution of perfluoropolyether used in Example 1 was replaced with an average molecular weight of 2300 represented by the following formula. 0.2% by weight of perfluoropolyether
A protective layer was formed in the same manner as in Example 1 except that the methyl ethyl ketone solution was used to prepare a video tape.
【００１４】比較例１ 実施例１における保護層の形成において、実施例１で使
用したパ−フルオロポリエ−テルの 0.2重量％メチルエ
チルケトン溶液に代えて、下記の式で表される平均分子
量が２０００のフォンブリンＺ ＤＯＬ（モンテカチ−
ニ社製；パ−フルオロポリエ−テル）の 0.2重量％フレ
オン溶液を用いた以外は、実施例１と同様にして保護層
を形成し、ビデオテ−プを作製した。 ＨＯＣＨ2 ＣＦ2(ＯＣＦ2 ＣＦ2)10（ＯＣＦ2)10ＯＣＦ
2 ＣＨ2 ＯＨComparative Example 1 In the formation of the protective layer in Example 1, the 0.2% by weight solution of perfluoropolyether in methyl ethyl ketone used in Example 1 was replaced with an average molecular weight of 2000 represented by the following formula. Fomblin Z DOL (Montekachi)
A video tape was prepared by forming a protective layer in the same manner as in Example 1 except that a 0.2% by weight Freon solution (manufactured by D. Co .; perfluoropolyether) was used. HOCH 2 CF 2 (OCF 2 CF 2 ) 10 (OCF 2 ) 10 OCF
2 CH 2 OH
【００１５】比較例２ 実施例１における保護層の形成において、実施例１で使
用したパ−フルオロポリエ−テルの 0.2重量％メチルエ
チルケトン溶液に代えて、下記の式で表される平均分子
量が２７００のパ−フルオロポリエ−テルの 0.2重量％
フレオン溶液を用いた以外は実施例１と同様にして保護
層を形成し、ビデオテ−プを作製した。 ＣＦ3(ＯＣＦ2 ＣＦ2 ＣＦ2)15ＣＦ2 ＣＦ2 ＯＨComparative Example 2 In the formation of the protective layer in Example 1, the 0.2% by weight solution of perfluoropolyether in methyl ethyl ketone used in Example 1 was replaced by an average molecular weight of 2700 represented by the following formula. 0.2% by weight of perfluoropolyether
A protective layer was formed in the same manner as in Example 1 except that the Freon solution was used to prepare a video tape. CF 3 (OCF 2 CF 2 CF 2 ) 15 CF 2 CF 2 OH
【００１６】比較例３ 実施例１における保護層の形成において、実施例１で使
用したパ−フルオロポリエ−テルの 0.2重量％メチルエ
チルケトン溶液に代えて、ステアリン酸の 0.2重量％メ
チルエチルケトン溶液を用いた以外は、実施例１と同様
にして保護層を形成し、ビデオテ−プを作製した。Comparative Example 3 In the formation of the protective layer in Example 1, a 0.2 wt% methyl ethyl ketone solution of stearic acid was used instead of the 0.2 wt% methyl ethyl ketone solution of perfluoropolyether used in Example 1. In the same manner as in Example 1, a protective layer was formed to produce a video tape.
【００１７】各実施例および比較例で得られたビデオテ
−プについて、下記の要領で摩擦係数を測定し、またジ
ッタ−特性および実走行耐久性を試験した。With respect to the video tapes obtained in the respective examples and comparative examples, the friction coefficient was measured in the following manner, and the jitter characteristics and the actual running durability were tested.
【００１８】＜摩擦係数＞表面粗度 0.2ｓ、外径４ｍｍ
の円筒ピンに、ビデオテ−プを巻き角１５０°で巻きつ
け、荷重２１ｇをかけて送り速度 1.4ｃｍ／秒で送り、
同じところを繰り返し測定して、１００回目の摩擦係数
を求めた。<Friction coefficient> Surface roughness 0.2 s, outer diameter 4 mm
Wrap the video tape around the cylindrical pin of at a wrap angle of 150 °, apply a load of 21 g, and feed at a feed rate of 1.4 cm / sec.
The same place was repeatedly measured to obtain the friction coefficient at the 100th time.
【００１９】＜ジッタ−特性＞ビデオテ−プをビデオデ
ッキに装填してビデオ信号を記録再生し、その再生信号
の 15.75ＫＨｚの水平同期信号の間隔を読み取り、その
ときの１秒間の水平同期信号の間隔のずれを測定して行
った。<Jitter characteristic> A video tape is loaded into a VCR to record and reproduce a video signal, and the interval of the horizontal sync signal of 15.75 KHz of the reproduced signal is read, and the horizontal sync signal of 1 second at that time is read. The gap was measured by measuring the gap.
【００２０】＜実走行耐久性＞ビデオテ−プをビデオデ
ッキに装填してビデオ信号を記録し、再生状態で繰り返
し走行させて、再生出力が初期に比べて３ｄＢ低下する
までの走行回数を測定した。下記表１はその結果であ
る。<Actual Running Durability> A video tape was loaded in a video deck, a video signal was recorded, the video signal was repeatedly run in a reproduction state, and the number of times the reproduction output was reduced by 3 dB from the initial value was measured. .. Table 1 below shows the results.
【００２１】 [0021]
【００２２】次に、上記の実施例および比較例で得られ
た各ビデオテ−プについて、８モ−ドシャトル耐久性を
試験した。試験法は、記録済のビデオテ−プ１３ｍを採
り、これを「早送り→早送りサ−チ→巻き戻しサ−チ→
（再生）ポ−ズ→早送りサ−チ→（録画）ポ−ズ→早送
り→巻き戻し」という一連の動作を１パスとして繰り返
し行い、１００回パス、２００回パス、３００回パス、
４００回パス、５００回パス毎に再生出力を測定し、初
期出力に対する出力低下値を測定して行った。下記表２
はその結果である。Next, the 8-mode shuttle durability was tested for each of the video tapes obtained in the above Examples and Comparative Examples. As a test method, a recorded video tape 13 m is taken, and this is recorded as "fast forward → fast forward search → rewind search →
A series of operations of "(playback) pose → fast-forward search → (recording) pose → fast-forward → rewind" is repeated as one pass, and 100 passes, 200 passes, 300 passes,
The reproduction output was measured every 400 passes and 500 passes, and the output reduction value with respect to the initial output was measured. Table 2 below
Is the result.
【００２３】 [0023]
【００２４】[0024]
【発明の効果】上記の表１および表２から明らかなよう
に、この発明で得られたビデオテ−プ（実施例１〜４）
は、いずれも従来のビデオテ−プ（比較例１〜３）に比
べて、摩擦係数が小さく、ジッタ−特性も小さくて、実
走行耐久性がよい。さらに、８モ−ドシャトル耐久性も
格段によく、このことからこの発明によって得られる磁
気記録媒体は走行性および耐久性に優れていることがわ
かる。As is apparent from Tables 1 and 2 above, the video tapes obtained in the present invention (Examples 1 to 4)
In comparison with the conventional video tapes (Comparative Examples 1 to 3), each of them has a smaller friction coefficient, a smaller jitter characteristic and a better running durability. Further, the 8-mode shuttle durability is remarkably good, which shows that the magnetic recording medium obtained by the present invention is excellent in running property and durability.
Claims (2)
この強磁性金属薄膜層の表面に、潤滑剤成分として、 −Ｃm Ｆ2mＯ−単位（但し、ｍは１〜１８の整数であ
る。） を基本骨格とするフッ素化ポリエ−テルの少なくとも一
つの末端に、一般式 −（ＯＣＨ2 ＣＨ2 ）n ＯＨ（但し、ｎは１〜３０の整
数である。） で表される極性基を有するフッ素化ポリエ−テルを存在
させたことを特徴とする磁気記録媒体1. A ferromagnetic metal thin film is provided on a non-magnetic substrate,
On the surface of the ferromagnetic metal thin film layer, as a lubricant component, -C m F 2m O- units (wherein, m is 1 to 18 integer.) A fluorinated polyether as a basic skeleton - ether of at least one the One end of the general formula - (OCH 2 CH 2) n OH ( where, n is an integer from 1 to 30.) fluorinated polyether having a polar group represented by - and characterized in that the presence of ether Magnetic recording media
が、分子量５００〜１００００の極性基を有するフッ素
化ポリエ−テルである請求項１記載の磁気記録媒体2. The magnetic recording medium according to claim 1, wherein the fluorinated polyether having a polar group is a fluorinated polyether having a polar group having a molecular weight of 500 to 10,000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8801492A JPH05258287A (en) | 1992-03-11 | 1992-03-11 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8801492A JPH05258287A (en) | 1992-03-11 | 1992-03-11 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05258287A true JPH05258287A (en) | 1993-10-08 |
Family
ID=13930993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8801492A Withdrawn JPH05258287A (en) | 1992-03-11 | 1992-03-11 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05258287A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998017617A1 (en) * | 1996-10-17 | 1998-04-30 | Hitachi, Ltd. | Fluorocompound, lubricant, surface modifier, lubricating film, magnetic recording medium, and magnetic recording device |
| WO2013054393A1 (en) * | 2011-10-11 | 2013-04-18 | 株式会社日立製作所 | Lubricant and magnetic disk device using same |
| US11555005B2 (en) | 2017-03-02 | 2023-01-17 | Showa Denko K.K. | Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium |
-
1992
- 1992-03-11 JP JP8801492A patent/JPH05258287A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998017617A1 (en) * | 1996-10-17 | 1998-04-30 | Hitachi, Ltd. | Fluorocompound, lubricant, surface modifier, lubricating film, magnetic recording medium, and magnetic recording device |
| US6323163B1 (en) | 1996-10-17 | 2001-11-27 | Hitachi, Ltd. | Fluorocompound, lubricant, surface modifier, lubricating film, magnetic recording medium, and magnetic recording device |
| WO2013054393A1 (en) * | 2011-10-11 | 2013-04-18 | 株式会社日立製作所 | Lubricant and magnetic disk device using same |
| US11555005B2 (en) | 2017-03-02 | 2023-01-17 | Showa Denko K.K. | Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |