JP2568984B2 - Manufacturing method of magnetic recording medium - Google Patents
Manufacturing method of magnetic recording mediumInfo
- Publication number
- JP2568984B2 JP2568984B2 JP6137395A JP13739594A JP2568984B2 JP 2568984 B2 JP2568984 B2 JP 2568984B2 JP 6137395 A JP6137395 A JP 6137395A JP 13739594 A JP13739594 A JP 13739594A JP 2568984 B2 JP2568984 B2 JP 2568984B2
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic recording
- hydrophilic group
- magnetic material
- metal magnetic
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁気記録媒体に関し、
特に潤滑層を有する金属薄膜型磁気記録媒体の製造方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium,
In particular, the present invention relates to a method for manufacturing a metal thin-film magnetic recording medium having a lubricating layer.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】近
年、情報処理の分野で記録媒体の高記録密度化が要求さ
れている。磁気記録媒体としては、金属薄膜媒体が、高
密度化、垂直磁気記録方式への対応という面で注目され
ている。2. Description of the Related Art In recent years, a high recording density of a recording medium has been required in the field of information processing. As a magnetic recording medium, a metal thin-film medium has attracted attention in terms of higher density and compatibility with a perpendicular magnetic recording system.
【０００３】しかし、金属薄膜自体は磁気特性における
要求、および薄膜という構造から、機械的特性、特に耐
摩耗性に劣るといえども改善は難しい。実際に摩耗粉等
により摩耗により、媒体のみならず録再ヘッドの寿命は
著しく短い。そこで、有効な潤滑が要求されている。[0003] However, the metal thin film itself is difficult to improve even though it is poor in mechanical characteristics, particularly in abrasion resistance, due to the demand for magnetic properties and the structure of the thin film. Actually, the life of the recording / reproducing head as well as the medium is extremely short due to abrasion due to abrasion powder or the like. Therefore, effective lubrication is required.
【０００４】一方、特公昭５６−４４４８７号公報に
は、磁性体塗布型磁気記録媒体において、パーフロロア
ルキルポリエーテルが潤滑剤として有効であると報告さ
れている。これは、摩擦係数の低減の他、化学的不活
性、低い揮発性、高い極圧性能など優れた性質を有す
る。この諸性質が金属薄膜型磁気記録媒体で発揮されれ
ば、その実用化の範囲は大きく拡大するはずである。On the other hand, JP-B-56-44487 reports that perfluoroalkyl polyether is effective as a lubricant in a magnetic material-coated magnetic recording medium. It has excellent properties such as chemical inertness, low volatility, and high extreme pressure performance, as well as a reduction in friction coefficient. If these properties are exhibited in a metal thin-film magnetic recording medium, the range of practical use should be greatly expanded.
【０００５】しかしながら、従来行なわれてきた溶剤に
よる希釈液を塗布、あるいは希釈液に浸漬後、乾燥する
という方法では均一な潤滑層を得ることはできなかっ
た。原因は、金属薄膜表面の酸化層による表面エネルギ
ーの低下、溶剤の濡れ性の悪さ、および溶剤の潜熱の起
因する水滴の凝結と考えられた。However, a conventional method of applying a diluting solution with a solvent or immersing in a diluting solution followed by drying cannot provide a uniform lubricating layer. It was considered that the cause was a decrease in surface energy due to the oxide layer on the surface of the metal thin film, poor wettability of the solvent, and condensation of water droplets caused by latent heat of the solvent.
【０００６】また、北寿郎氏の「フェライトヘッドの摩
耗に及ぼす磁気ディスク表面潤滑剤の影響」（日本潤滑
学会春季研究会予稿集１９８１年第１９７頁に挙げられ
たパーフロロアルキルポリエーテルを単独で塗布する方
法では形成される潤滑層が厚く、粘性によって摩擦抵抗
が大きいという欠点があり、また同論文の中の熱処理法
も、磁気記録媒体の基板の材質が耐熱性を持ち、熱によ
る変形がないものに限られるという欠点を有していた。[0006] Also, "Influence of magnetic disk surface lubricant on the wear of ferrite head" by Toshio Kita (Perfluoroalkyl polyether listed alone in the 197th Spring Workshop of the Society of Lubrication Society of Japan, 197, p. 197). The coating method has the disadvantage that the formed lubricating layer is thick and the frictional resistance is large due to viscosity.The heat treatment method in the same paper also has the heat-resistant substrate material of the magnetic recording medium, Had the disadvantage of being limited to those that did not.
【０００７】本発明は、従来の希釈液を用いる方法を改
善することによって、その欠点を除去し、金属薄膜の組
成や基板材質を問わず、パーフロロポリエーテルよりな
る厚さ数μｍ以下の均一なかつ耐摩耗特性に優れた潤滑
膜を有する磁気記録媒体の製造方法を提供することを目
的とする。[0007] The present invention improves the conventional method using a diluting solution to eliminate the drawback, and enables uniform formation of a perfluoropolyether having a thickness of several μm or less regardless of the composition of the metal thin film or the material of the substrate. It is an object of the present invention to provide a method of manufacturing a magnetic recording medium having a lubricating film having excellent wear resistance.
【０００８】[0008]
【課題を解決するための手段】そこで、上記目的を達成
するため、本発明の磁気記録媒体の製造方法は、金属磁
性体を有する磁気記録媒体の製造方法において、前記金
属磁性体上方に、０．１〜５体積％のパーフロロポリエ
ーテル、好ましくは１〜６０体積％の親水基を有する有
機化合物および好ましくは１〜２０体積％の親水基を有
するフッ素置換化合物を含んでなる塗布液を塗布する
か、この塗布液に前記金属磁性体を浸積し、次いで、こ
の塗布液を乾燥することにより前記金属磁性体上に潤滑
層が形成された磁気記録媒体を得ることを特徴とするも
のである。Therefore, in order to achieve the above object, a method of manufacturing a magnetic recording medium according to the present invention is directed to a method of manufacturing a magnetic recording medium having a metal magnetic material, the method comprising: A coating liquid comprising 1 to 5% by volume of perfluoropolyether, preferably 1 to 60% by volume of an organic compound having a hydrophilic group and preferably 1 to 20% by volume of a fluorine-substituted compound having a hydrophilic group Alternatively, the metal magnetic material is immersed in the coating solution, and then the coating solution is dried to obtain a magnetic recording medium having a lubricating layer formed on the metal magnetic material. is there.
【０００９】本発明で使用するパーフロロポリエーテル
としては、例えば米国デュポン社製 ＫＲＹＴＯＸ１４３ＡＣ，ＫＲＹＴＯＸ１４３ＡＤ，Ｋ
ＲＹＴＯＸ１４３ＡＸ， ＫＲＹＴＯＸ１４３ＡＢ，ＫＲＹＴＯＸ１４３ＡＹ，Ｋ
ＲＹＴＯＸ１４３ＡＡ， ＫＲＹＴＯＸ１４３ＡＺ，ＫＲＹＴＯＸ１４３ＣＺ等、 Ｆ−〔ＣＦ（ＣＦ３）−ＣＦ２−Ｏ〕ｎ−Ｃ２Ｆ５ ｎ＝１１〜４９ の構造を持つものが挙げられる。The perfluoropolyether used in the present invention
For example, KRYTOX143AC, KRYTOX143AD, K manufactured by DuPont
RYTOX143AX, KRYTOX143AB, KRYTOX143AY, K
RYTOX143AA, KRYTOX143AZ, KRYTOX143CZ, etc.3) -CF2-O]n-C2F5 n = 11 to 49.
【００１０】また、親水基を有する有機化合物として
は、アルコール、グリコール、グリセリン、フェノー
ル、カルボン酸等が挙げられる。これらは、親水基と金
属薄膜表面の酸化物との間に働く力によって塗布液の濡
れ性を改善する作用を持つ。また、水が溶解度を持つも
のは、溶剤の気化潜熱で凝結した水が金属薄膜表面に付
着するのを防ぐ作用を持つ。水滴の付着は、均一な潤滑
層形成の阻害要因となるので、この作用は均一な潤滑膜
の形成を助ける。The organic compound having a hydrophilic group includes alcohol, glycol, glycerin, phenol, carboxylic acid and the like. These have the effect of improving the wettability of the coating liquid by the force acting between the hydrophilic group and the oxide on the surface of the metal thin film. Water having solubility has an effect of preventing water condensed by latent heat of vaporization of the solvent from adhering to the surface of the metal thin film. This action helps to form a uniform lubricating film, since the adhesion of water droplets is a hindrance to the formation of a uniform lubricating layer.
【００１１】親水基を持つフッ素置換有機化合物として
は、上記の有機化合物のフッ素置換体が挙げられる。こ
れらは、塗布液の濡れ性を改善する作用を有する他、溶
剤が揮発した後、パーフロロポリエーテルを均一に分散
させる作用を有する。Examples of the fluorine-substituted organic compound having a hydrophilic group include the fluorine-substituted organic compounds described above. These have the function of improving the wettability of the coating solution and the function of uniformly dispersing the perfluoropolyether after the solvent has volatilized.
【００１２】また、パーフロロポリエーテルの溶剤のフ
レオン類としては、パーフロロアルカン、パークロロパ
ーフロロアルカン等があり、例として、トリクロロトリ
エタン（例えば、ダイキン社製ダイフロンＳ３、米国デ
ュポン社製フレオン１１３等）、テトラクロロジフロロ
エタン（ダイキン社製ダイフロンＳ２、等）、トリクロ
ロモノフロロメタン（ダイキン社製ダイフロンＳ１）等
が挙げられる。Examples of freons as solvents for perfluoropolyether include perfluoroalkanes and perchloroperfluoroalkanes. Examples thereof include trichlorotriethane (for example, Daiflon S3 manufactured by Daikin, Freon manufactured by DuPont, USA) 113), tetrachlorodifluoroethane (Daiflon S2, etc., manufactured by Daikin), trichloromonofluoromethane (Daiflon S1, manufactured by Daikin) and the like.
【００１３】[0013]
【実施例】以下に、本発明の実施例を述べる。実施例１ 以下に塗布液の組成で示す、以後、組成は室温における
体積率で表わす。 パーフロロアルキルポリエーテル （米国デュポン社製ＫＲＹＴＯＸ１４３ＡＣ） １％ パーフロロアルキルアルコール （ダイキン社製フッ素アルコールｎ：３） ５％ エタノール １５％ なお溶剤として、トリクロロトリフロロエタン（ダイキ
ン社製ダイフロンＳ３）を用いた。 磁気記録媒体 基板 ポリエチレンテレフタレート 金属薄膜 Ｃｏ−Ｃｒスパッタ膜 該コーティング液に該媒体を浸漬、自然乾燥した。その
結果、部分的に滴状の凸部が観察できたが、平均厚数μ
ｍ以下のパーフロロアルキルポリエーテルの潤滑層が得
られた。Embodiments of the present invention will be described below. Example 1 The composition of the coating solution is shown below. Hereinafter, the composition is represented by a volume ratio at room temperature. Perfluoroalkyl polyether (KRYTOX143AC manufactured by DuPont, USA) 1% Perfluoroalkyl alcohol (Fluorine alcohol n: 3 manufactured by Daikin) 5% Ethanol 15% Trichlorotrifluoroethane (Daiflon S3 manufactured by Daikin) is used as a solvent. Was. Magnetic recording medium Substrate Polyethylene terephthalate Metal thin film Co-Cr sputtered film The medium was immersed in the coating solution and air-dried. As a result, a drop-shaped convex part could be partially observed, but the average thickness was several μm.
m or less perfluoroalkyl polyether lubricating layer was obtained.
【００１４】この磁気記録媒体について、球面ダミーヘ
ッドを用いた摩耗耐久試験を行なった。ダミーヘッド
は、材質はＭｇＯ−Ａｌ２Ｏ３で、球面の曲率半径は５
０ｍｍである。装置は市販のフロッピーディスクドライ
ブを改造した。実験条件は、毎分３００回転、押圧１０
ｇ／ｍｍ２とした。耐久時間として、金属薄膜の磁性体
層が破壊、剥落するまでの時間をとった。This magnetic recording medium was subjected to a wear durability test using a spherical dummy head. The material of the dummy head is MgO—Al 2 O 3 and the radius of curvature of the spherical surface is 5
0 mm. The device was modified from a commercial floppy disk drive. The experimental conditions were 300 revolutions per minute, 10 pressing.
g / mm 2 . As the endurance time, the time until the magnetic layer of the metal thin film was broken and peeled off was taken.
【００１５】結果を図１のグラフに示す。従来法では、
最高値で１１．５時間、１時間以上耐えたものについて
の平均は約７時間なのに対し、本発明を施した実施例１
では最高値で１７０時間の運転に耐え、１６７時間以上
耐えた試料３，４，５については、実験終了時点で磁性
体層に何らの破壊、剥落も観察できなかった。この結果
から、本発明によって形成される潤滑膜の有効性が証明
された。実施例２ 実施例１の塗布液と媒体を用いて、スプレーコーティン
グ、スピンコーティングによる潤滑層形成を試み、実施
例１と同様の結果を得た。実施例３ 実施例１の塗布液の組成において、パーフロロアルキル
ポリエーテルについて０．１％から５％まで、パーフロ
ロアルキルアルコールを１％から２０％まで、エタノー
ルを１％から６０％まで、さまざまな値を取って試み
た。潤滑層厚は変化したが均一なものが得られた。The results are shown in the graph of FIG. In the conventional method,
The average of about 11.5 hours at the highest value and about 7 hours for the one endured for 1 hour or more was compared with Example 1 to which the present invention was applied.
In Samples 3, 4, and 5, which withstood the operation for 170 hours at the maximum value and withstood 167 hours or more, no destruction or peeling of the magnetic layer was observed at the end of the experiment. From these results, the effectiveness of the lubricating film formed by the present invention was proved. Example 2 Using the coating solution and the medium of Example 1 to form a lubricating layer by spray coating and spin coating, the same results as in Example 1 were obtained. Example 3 In the composition of the coating solution of Example 1, the perfluoroalkyl polyether was varied from 0.1% to 5%, the perfluoroalkyl alcohol was varied from 1% to 20%, and the ethanol was varied from 1% to 60%. I tried to take a good value. The thickness of the lubricating layer varied, but was uniform.
【００１６】上記の値は、より好ましい結果の得られる
範囲であり、上限以上でも潤滑層はきわめて厚くなるが
得られる。ただし、下限以下では、潤滑層の観察、測定
が難しい。なお、最も好ましい範囲は、 パーフロロアルキルポリエーテル ０．２〜２％ パーフロロアルキルアルコール ３〜１０％ エタノール ５〜２０％ であった。実施例４ 実施例１の塗布液の組成のうち、エタノールの代わりに
メタノール、プロパノール、ブタノールを用いたとこ
ろ、ほぼ均一な潤滑層が得られた。実施例５ 実施例１の塗布液の組成のうち、パーフロロアルキルア
ルコールの代わりに、パーフロロアルキルカルボン酸
（ダイキン社製フッ素カルボン酸ｎ：２）を用いたとこ
ろ、実施例４と同程度の結果が得られた。実施例６ 磁気媒体の金属薄膜にＣｏ−Ｔａスパッタ膜を用いた。
実施例１の塗布液を用いて、実施例１と同様の結果が得
られた。The above value is a range in which more preferable results can be obtained. Even if the value is more than the upper limit, the lubricating layer can be extremely thick. However, below the lower limit, it is difficult to observe and measure the lubricating layer. In addition, the most preferable range was perfluoroalkyl polyether 0.2-2% perfluoroalkyl alcohol 3-10% ethanol 5-20%. Example 4 In the composition of the coating solution of Example 1, when methanol, propanol and butanol were used instead of ethanol, a substantially uniform lubricating layer was obtained. Example 5 In the composition of the coating liquid of Example 1, a perfluoroalkyl carboxylic acid (fluorine carboxylic acid n: 2 manufactured by Daikin Co.) was used instead of the perfluoroalkyl alcohol. The result was obtained. Example 6 A Co-Ta sputtered film was used as a metal thin film of a magnetic medium.
The same results as in Example 1 were obtained using the coating liquid of Example 1.
【００１７】以上の如く、本発明による磁気記録媒体に
おいては、金属薄膜型の磁気記録媒体の表面に、パーフ
ロロポリエーテルをフレオンにとかした溶液に、親水基
を有する有機化合物、または親水基を有するフッ素置換
化合物の少なくともいずれかを添加し、塗布することに
より潤滑層が形成されているので、以下のような効果を
有する。 Ａ）金属薄膜型の磁気記録媒体の摩耗、録再ヘッドの摩
耗が従来に比べて著しく減少する。 Ｂ）潤滑層の厚みは塗布液の組成によるので、最適化が
容易である。 Ｃ）潤滑層の形成が室温付近で可能であるし、溶剤も溶
解性がおだやかで反応性の低いフレオン（例えばトリク
ロロトリフロロエタン）を用いることができる。 Ｄ）前記Ｃ）は従来法のフレオン溶液を用いる方法の長
所でもあるが、基板の非選択性をそっくり残したまま、
従来法の加熱処理法と同程度に有効な潤滑層を形成でき
る。 Ｅ）加熱処理法に比べて、加熱工程が不要のため設備、
時間等が節約できる。 Ｆ）親水基を有する化合物として、水に対する溶解度の
大きいもの、例えば、実施例１のエタノール等を用いる
と、作業雰囲気の温度や製造前工程における付着水の処
理に対する考慮が必要なくなる。 Ｇ）金属薄膜型の磁気記録媒体の潤滑層形成、特に、基
板材質の自由度が高いという効果から、磁気テープやフ
ロッピーディスクの潤滑に適している。この分野では、
基板材質や磁性体の改善が容易になるという効果もあ
る。 Ｈ）酸化層とのなじみが向上しているので、従来の酸化
物を磁性体とする塗布型磁気記録媒体の潤滑にも効果的
である。この場合、工程の単純化という利点も生ずる。 Ｉ）パーフロロポリエーテルの潤滑層厚の調節が容易な
ので、従来、パーフロロポリエーテルの使用されていた
電子、航空分野での使用範囲が広がる。特に、真空度の
変化で潤滑効果に変化が出る固体潤滑の使用されている
箇所への使用が考えられる。As described above, in the magnetic recording medium according to the present invention, an organic compound having a hydrophilic group or a hydrophilic group is added to a solution of perfluoropolyether in Freon on the surface of a metal thin film type magnetic recording medium. Since the lubricating layer is formed by adding and applying at least one of the fluorine-substituted compounds, the following effects are obtained. A) The wear of the metal thin film type magnetic recording medium and the wear of the recording / reproducing head are significantly reduced as compared with the conventional case. B) Since the thickness of the lubricating layer depends on the composition of the coating solution, it can be easily optimized. C) The formation of a lubricating layer is possible at around room temperature, and a solvent having low solubility and low reactivity, such as freon (for example, trichlorotrifluoroethane), can be used. D) The above C) is also an advantage of the method using a conventional freon solution, but it is possible to maintain the non-selectivity of the substrate entirely.
A lubricating layer that is as effective as the conventional heat treatment can be formed. E) Compared to the heat treatment method, equipment is not required because a heating step is not required.
Time can be saved. F) When a compound having a high solubility in water, for example, ethanol of Example 1, is used as the compound having a hydrophilic group, it is not necessary to consider the temperature of the working atmosphere and the treatment of the attached water in the pre-manufacturing process. G) It is suitable for lubricating magnetic tapes and floppy disks because of the effect of forming a lubricating layer on a metal thin-film type magnetic recording medium, and in particular, having a high degree of freedom in substrate material. In this area,
There is also an effect that the substrate material and the magnetic material can be easily improved. H) Since the compatibility with the oxide layer is improved, it is also effective for lubricating a coating type magnetic recording medium using a conventional oxide as a magnetic material. In this case, there is an advantage that the process is simplified. I) Since the thickness of the lubricating layer of perfluoropolyether can be easily adjusted, the range of use of perfluoropolyether in the fields of electronics and aviation, where conventional perfluoropolyether has been used, is widened. In particular, it is conceivable to use solid lubrication where the lubrication effect changes due to a change in the degree of vacuum.
【図面の簡単な説明】[Brief description of the drawings]
【図１】摩耗耐久試験による耐久時間の測定結果を示す
グラフ。FIG. 1 is a graph showing measurement results of a durability time by a wear durability test.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−200940（ＪＰ，Ａ) 特開 昭56−124127（ＪＰ，Ａ) 特開 昭56−87236（ＪＰ，Ａ) 特開 昭57−198541（ＪＰ，Ａ) 特開 昭57−200939（ＪＰ，Ａ) 特公 平４−30084（ＪＰ，Ｂ２) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-200940 (JP, A) JP-A-56-124127 (JP, A) JP-A-56-87236 (JP, A) JP-A-57-2009 198541 (JP, A) JP-A-57-200939 (JP, A) JP-B-4-30084 (JP, B2)
Claims (10)
法において、前記金属磁性体上方に、０．１〜５体積％
のバーフロロポリエーテル、親水基を有する有機化合物
および親水基を有するフッ素置換化合物を含んでなる塗
布液を塗布し、次いで、この塗布液を乾燥することによ
り前記金属磁性体上に潤滑層が形成された磁気記録媒体
を得ることを特徴とする、磁気記録媒体の製造方法。2. A method for manufacturing a magnetic recording medium having a metal magnetic material, comprising:
A lubricating layer is formed on the metal magnetic material by applying a coating solution containing a bar fluoropolyether, an organic compound having a hydrophilic group, and a fluorine-substituted compound having a hydrophilic group, and then drying the coating solution. A method for manufacturing a magnetic recording medium, characterized in that a magnetic recording medium is obtained.
有する有機化合物および１〜２０体積％の親水基を有す
るフッ素置換化合物を含む、請求項１に記載の方法。2. The method according to claim 1, wherein said coating solution contains 1 to 60% by volume of an organic compound having a hydrophilic group and 1 to 20% by volume of a fluorine-substituted compound having a hydrophilic group.
なる、請求項１に記載の方法。3. The method according to claim 1, wherein the metal magnetic material is made of a material containing an oxide.
に記載の方法。4. The method according to claim 1, wherein said coating liquid contains freon.
The method described in.
ものである、請求項１に記載の方法。5. The method according to claim 1, wherein said metal magnetic material is provided on a resin base material.
法において、０．１〜５体積％のパーフロロポリエーテ
ル、親水基を有する有機化合物および親水基を有するフ
ッ素置換化合物を含んでなる塗布液に前記金属磁性体を
浸積し、次いで、この塗布液を乾燥することにより前記
金属磁性体上に潤滑層が形成された磁気記録媒体を得る
ことを特徴とする、磁気記録媒体の製造方法。6. A method for producing a magnetic recording medium having a metal magnetic material, comprising a coating comprising 0.1 to 5% by volume of perfluoropolyether, an organic compound having a hydrophilic group, and a fluorine-substituted compound having a hydrophilic group. Immersing the metal magnetic material in a liquid, and then drying the coating liquid to obtain a magnetic recording medium having a lubricating layer formed on the metal magnetic material. .
有する有機化合物および１〜２０体積％の親水基を有す
るフッ素置換化合物を含む、請求項６に記載の方法。7. The method according to claim 6, wherein said coating solution contains 1 to 60% by volume of an organic compound having a hydrophilic group and 1 to 20% by volume of a fluorine-substituted compound having a hydrophilic group.
なる、請求項６に記載の方法。8. The method according to claim 6, wherein said metal magnetic material is made of a material containing an oxide.
に記載の方法。9. The coating liquid according to claim 6, wherein said coating liquid contains freon.
The method described in.
たものである、請求項６に記載の方法。10. The method according to claim 6, wherein said metal magnetic material is provided on a resin base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6137395A JP2568984B2 (en) | 1994-06-20 | 1994-06-20 | Manufacturing method of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6137395A JP2568984B2 (en) | 1994-06-20 | 1994-06-20 | Manufacturing method of magnetic recording medium |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57217285A Division JPS59107428A (en) | 1982-12-10 | 1982-12-10 | Formation of lubricating layer for magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0750011A JPH0750011A (en) | 1995-02-21 |
| JP2568984B2 true JP2568984B2 (en) | 1997-01-08 |
Family
ID=15197671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6137395A Expired - Lifetime JP2568984B2 (en) | 1994-06-20 | 1994-06-20 | Manufacturing method of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2568984B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5847769B2 (en) * | 1979-12-14 | 1983-10-25 | 日立マクセル株式会社 | magnetic recording medium |
-
1994
- 1994-06-20 JP JP6137395A patent/JP2568984B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0750011A (en) | 1995-02-21 |
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