JPH04238114A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04238114A JPH04238114A JP7812191A JP7812191A JPH04238114A JP H04238114 A JPH04238114 A JP H04238114A JP 7812191 A JP7812191 A JP 7812191A JP 7812191 A JP7812191 A JP 7812191A JP H04238114 A JPH04238114 A JP H04238114A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- lubricant
- recording medium
- magnetic recording
- magnetic layer
- 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.)
- Pending
Links
- 239000000314 lubricant Substances 0.000 claims abstract description 37
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011737 fluorine Substances 0.000 abstract description 7
- 229910052731 fluorine Inorganic materials 0.000 abstract description 7
- 239000006247 magnetic powder Substances 0.000 abstract description 7
- 229920001296 polysiloxane Polymers 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 239000011230 binding agent Substances 0.000 abstract description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 238000005461 lubrication Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- -1 isocyanate compound Chemical class 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- GRXOKLJPWSYWIA-UHFFFAOYSA-N 2-ethylhexyl tetradecanoate Chemical compound CCCCCCCCCCCCCC(=O)OCC(CC)CCCC GRXOKLJPWSYWIA-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 description 1
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、磁気テープ、磁気デ
イスクなど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 magnetic recording media such as magnetic tapes and magnetic disks.
【０００２】0002
【従来の技術】一般に、磁気記録媒体は、記録再生時に
磁性層の表面が磁気ヘツドと摺接することから、磁性層
の耐久性つまり対磁気ヘツド摺動耐久性にすぐれること
が必要である。2. Description of the Related Art Generally, in a magnetic recording medium, since the surface of the magnetic layer comes into sliding contact with a magnetic head during recording and reproduction, it is necessary that the magnetic layer has excellent durability, that is, durability against sliding with respect to the magnetic head.
【０００３】従来、上記耐久性を向上させる手段として
、磁性層中に研摩剤や充てん剤としての非磁性無機粉末
を配合して磁性層の塗膜強度を高めると共に、磁性層の
表面ないし内部に潤滑剤を保持させて磁性層表面の摩擦
係数を低減させる方法が一般的に採用されている。Conventionally, as a means to improve the above-mentioned durability, non-magnetic inorganic powder as an abrasive or filler is added to the magnetic layer to increase the coating strength of the magnetic layer. A method generally employed is to retain lubricant and reduce the coefficient of friction on the surface of the magnetic layer.
【０００４】0004
【発明が解決しようとする課題】ところで、近年の情報
処理システムの高度化に伴つて磁気記録においても高密
度化、デジタル化が進み、これに対応してデータ転送速
度を速めるため、磁気記録媒体を高速駆動させて磁気ヘ
ツドと２０ｍ／秒以上といつた相対速度で摺接させるよ
うなシステムの開発が希求されている。[Problems to be Solved by the Invention] As information processing systems have become more sophisticated in recent years, magnetic recording has become more dense and digitalized. There is a need for the development of a system in which the magnetic head is driven at high speed and brought into sliding contact with the magnetic head at a relative speed of 20 m/sec or more.
【０００５】しかるに、このような高速摺動システムに
なると、従来の一般的な低速摺動システム（通常の摺動
速度１〜１０ｍ／秒程度）に用いられていた磁気記録媒
体では満足な耐久性が得られず、磁性層表面の潤滑機構
自体を従来とは異なる観点で見直す必要があることが判
明した。However, when it comes to such high-speed sliding systems, the magnetic recording media used in conventional general low-speed sliding systems (normal sliding speeds of about 1 to 10 m/sec) do not have satisfactory durability. It was found that the lubrication mechanism itself on the surface of the magnetic layer needed to be reconsidered from a different perspective than before.
【０００６】この発明は、上述の事情に鑑み、磁気ヘツ
ドに高速で摺接させるタイプの磁気記録媒体として対磁
気ヘツド摺動耐久性にすぐれたものを提供することを目
的としている。SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a magnetic recording medium of a type that is brought into sliding contact with a magnetic head at high speed and has excellent sliding durability against a magnetic head.
【０００７】[0007]
【課題を解決するための手段】この発明者らは、上記目
的において、まず磁気記録媒体の潤滑機構に関してトラ
イボロジー（Ｔｒｉｂｏｌｏｇｙ：摩擦学）の面から検
討を行つた。すなわち、トライボロジーによれば、（潤
滑剤の粘度）×（摺動速度）／（荷重）＝Ａとすると、
Ａの値が小さいほど境界潤滑となり、逆に大きいほど流
体潤滑になるとされているが、前記のように摺動速度が
２０ｍ／秒といつた高速で接する磁気記録媒体と磁気ヘ
ツドとの潤滑機構は、上式左辺の分子の数値が大きくな
るために流体潤滑の領域により近くなると考えられる。
また、流体潤滑の領域でＡの値が大きくなれば摩擦係数
の増大を招くため、潤滑剤としては低粘度、低表面張力
のものがよいと考えられる。[Means for Solving the Problems] For the above purpose, the inventors first investigated the lubrication mechanism of a magnetic recording medium from the viewpoint of tribology. That is, according to tribology, if (viscosity of lubricant) x (sliding speed) / (load) = A,
It is said that the smaller the value of A, the better the boundary lubrication, and conversely, the larger the value of A, the better the fluid lubrication.As mentioned above, the lubrication mechanism between the magnetic recording medium and the magnetic head, which are in contact at a high sliding speed of 20 m/s, is is considered to be closer to the hydrodynamic lubrication region because the numerical value of the numerator on the left side of the above equation becomes larger. Furthermore, in the region of fluid lubrication, if the value of A increases, the coefficient of friction increases, so it is thought that a lubricant with low viscosity and low surface tension is preferable.
【０００８】そこで、この発明者らは、上記の知見に基
づいてさらに検討を重ねることにより、磁気ヘツドと２
０ｍ／秒以上の速度で摺接させる磁気記録媒体用として
最も適する潤滑剤を究明し、この発明をなすに至つた。[0008] Therefore, the inventors conducted further studies based on the above findings and discovered that the magnetic head and
The inventors have investigated the most suitable lubricant for magnetic recording media that are brought into sliding contact at speeds of 0 m/sec or higher, and have come up with this invention.
【０００９】すなわち、この発明は、磁気ヘツドと２０
ｍ／秒以上の速度で摺接させる磁気記録媒体において、
非磁性支持体上に形成された磁性層に、２５℃での粘度
が４０センチストークス以下で、かつ表面張力が２５ｄ
ｙｎｅ／ｃｍ以下の潤滑剤が保持されていることを特徴
とする磁気記録媒体に係るものである。That is, the present invention has a magnetic head and 20
In a magnetic recording medium that is brought into sliding contact at a speed of m/s or more,
The magnetic layer formed on the non-magnetic support has a viscosity of 40 centistokes or less at 25°C and a surface tension of 25 d.
The present invention relates to a magnetic recording medium characterized in that a lubricant of less than yne/cm is held therein.
【００１０】0010
【発明の構成・作用】この発明で用いる潤滑剤は、前記
の如く２５℃での粘度が４０センチストークス以下で、
かつ表面張力が２５ｄｙｎｅ／ｃｍ以下のものであり、
これを磁気ヘツドとの摺動速度が２０ｍ／秒以上の高速
となる磁気記録媒体の磁性層に保持させることにより、
この磁気記録媒体に非常にすぐれた耐久性つまり対磁気
ヘツド摺動耐久性が付与される。Structure and operation of the invention As mentioned above, the lubricant used in the present invention has a viscosity of 40 centistokes or less at 25°C,
and has a surface tension of 25 dyne/cm or less,
By holding this in the magnetic layer of a magnetic recording medium that has a sliding speed of 20 m/sec or more with the magnetic head,
This magnetic recording medium is endowed with extremely excellent durability, ie, durability against magnetic head sliding.
【００１１】これに対し、上記粘度と表面張力のいずれ
か一方でも上記規定値を超える潤滑剤では、後述する各
比較例の耐久性試験結果で示されるように、この発明の
対象とする磁気ヘツドと高速摺接する磁気記録媒体に対
しては充分な耐久性を付与できないことが判明している
。On the other hand, in the case of a lubricant in which either the viscosity or the surface tension exceeds the specified value, as shown in the durability test results of each comparative example described below, the magnetic head of the present invention cannot be used. It has been found that sufficient durability cannot be imparted to magnetic recording media that come into sliding contact at high speeds.
【００１２】この発明で用いる上記潤滑剤としては、粘
度と表面張力が前記規定範囲にあるものであれば特に種
類を問わず使用可能であるが、たとえばフツ素系潤滑剤
やシリコーン系潤滑剤などが好ましく用いられ、これら
を併用することもできる。[0012] As the above-mentioned lubricant used in this invention, any type can be used as long as the viscosity and surface tension are within the specified ranges, but for example, fluorine-based lubricants, silicone-based lubricants, etc. are preferably used, and these can also be used in combination.
【００１３】このような潤滑剤は、磁性層の表面に被着
して保持させてもよいし、磁性層の内部に含有させても
よく、また表面と内部の両方に保持させても差し支えな
い。磁性層の表面に保持させる場合の潤滑剤の保持量は
、１５〜３５０ｍｇ／ｍ２程度とするのがよい。磁性層
の内部に含有させる場合の潤滑剤の含有量は、磁性粉末
１００重量部に対して１〜１０重量部程度とするのがよ
い。[0013] Such a lubricant may be adhered to and held on the surface of the magnetic layer, may be contained inside the magnetic layer, or may be held both on the surface and inside the magnetic layer. . The amount of lubricant retained on the surface of the magnetic layer is preferably about 15 to 350 mg/m2. The content of the lubricant when contained inside the magnetic layer is preferably about 1 to 10 parts by weight per 100 parts by weight of the magnetic powder.
【００１４】この発明の磁気記録媒体を製造するには、
常法に準じ、磁性粉末および結合剤を含む磁性塗料を調
製し、この塗料をポリエステルフイルムなどの非磁性支
持体上に塗布，乾燥して磁性層を形成し、要すればカレ
ンダー加工などの表面処理を施したのち、所要形状に裁
断すればよい。[0014] To manufacture the magnetic recording medium of the present invention,
A magnetic paint containing magnetic powder and a binder is prepared according to a conventional method, and this paint is applied onto a non-magnetic support such as a polyester film and dried to form a magnetic layer. After processing, it may be cut into the desired shape.
【００１５】ここで、磁性層の表面に前記潤滑剤を保持
させる場合は、この潤滑剤を適当な溶媒に溶解させた溶
液を上記裁断前の磁気シートの磁性層表面に塗布し、溶
媒を揮散させればよい。また、磁性層の内部に前記潤滑
剤を含有させる場合は、上記の磁性塗料中に予め所要量
の潤滑剤を配合しておけばよい。When the lubricant is retained on the surface of the magnetic layer, a solution of the lubricant dissolved in a suitable solvent is applied to the surface of the magnetic layer of the magnetic sheet before cutting, and the solvent is evaporated. Just let it happen. Further, when the lubricant is contained inside the magnetic layer, the required amount of the lubricant may be blended in advance into the magnetic paint.
【００１６】上記磁性粉末としては、Ｆｅ，Ｃｏ，Ｎｉ
，これらの合金，これらと少量の他の金属または非金属
元素を含む合金などからなる金属磁性粉末、γ−Ｆｅ２
Ｏ３，Ｃｏ含有γ−Ｆｅ２Ｏ３，Ｆｅ３Ｏ４などからな
る針状酸化鉄系粉末、Ｂａフエライト，Ｓｒフエライト
，Ｐｂフエライトなどからなる六方晶フエライト磁性粉
末など、従来より磁気記録媒体の磁気記録素子として知
られるものをいずれも使用可能である。[0016] As the magnetic powder, Fe, Co, Ni
, alloys of these, alloys containing small amounts of other metals or nonmetallic elements, etc., metal magnetic powders, γ-Fe2
Things conventionally known as magnetic recording elements for magnetic recording media, such as acicular iron oxide powders made of O3, Co-containing γ-Fe2O3, Fe3O4, etc., hexagonal ferrite magnetic powders made of Ba ferrite, Sr ferrite, Pb ferrite, etc. Both can be used.
【００１７】前記の結合剤としては、塩化ビニル系樹脂
、塩化ビニル−酢酸ビニル系共重合体、繊維素系樹脂、
ポリウレタン系樹脂、ポリビニルブチラール系樹脂、ポ
リエステル系樹脂、架橋剤としてのポリイソシアネート
化合物、電子線や紫外線の照射によつて硬化する放射線
硬化型樹脂など、従来より磁気記録媒体の磁性層用とし
て知られるものを単独でまたは二種以上を混合して使用
できる。[0017] As the binder, vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, cellulose resin,
Conventionally known for use in magnetic layers of magnetic recording media, such as polyurethane resins, polyvinyl butyral resins, polyester resins, polyisocyanate compounds as crosslinking agents, and radiation-curable resins that are cured by irradiation with electron beams or ultraviolet rays. They can be used alone or in combination.
【００１８】また、前記の磁性塗料中には、研摩剤、充
てん剤、分散剤、帯電防止剤、着色剤などの各種の添加
剤を必要に応じて適宜配合してもよい。[0018] Furthermore, various additives such as an abrasive, a filler, a dispersant, an antistatic agent, and a coloring agent may be appropriately blended into the magnetic coating material as required.
【００１９】[0019]
【発明の効果】この発明によれば、磁気ヘツドと２０ｍ
／秒以上の速度で摺接させる磁気記録媒体として、対磁
気ヘツド摺動耐久性に著しくすぐれるものを提供できる
。[Effect of the invention] According to this invention, the magnetic head and the
It is possible to provide a magnetic recording medium that is brought into sliding contact at a speed of 1/2 or more and has extremely excellent sliding durability against a magnetic head.
【００２０】[0020]
【実施例】つぎに、この発明の実施例を比較例と対比し
て具体的に説明する。なお、以下において部とあるのは
重量部を意味する。EXAMPLES Next, examples of the present invention will be specifically explained in comparison with comparative examples. In addition, in the following, parts mean parts by weight.
【００２１】[0021]
【００２２】上記の組成物をボールミル中で７２時間混
合分散させたのち、三官能性イソシアネート化合物（日
本ポリウレタン社製の商品名コロネートＬ）４．５部を
加えてさらに１時間分散して磁性塗料を調製した。After mixing and dispersing the above composition in a ball mill for 72 hours, 4.5 parts of a trifunctional isocyanate compound (trade name Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) was added and dispersed for an additional hour to form a magnetic coating material. was prepared.
【００２３】この塗料を厚さ９μｍのポリエチレンテレ
フタレートフイルム上にカレンダー加工後の厚さが２．
５μｍとなるように塗布，乾燥して磁性層を形成し、カ
レンダー加工を施したのち、ロール状の磁気原反の形で
５０℃にて４日間保存した。[0023] This paint was applied to a polyethylene terephthalate film having a thickness of 9 μm and the thickness after calendering was 2.0 μm.
A magnetic layer was formed by coating and drying to a thickness of 5 μm, calendering, and storage at 50° C. for 4 days in the form of a roll of magnetic material.
【００２４】この保存後の磁気原反の磁性層表面に、下
記の潤滑剤のフレオン溶液を溶媒乾燥後の潤滑剤の保持
量が１００ｍｇ／ｍ２となる割合で塗布，乾燥した上で
、１９ｍｍ幅にスリツトして磁気テープを作製した。[0024] A Freon solution of the following lubricant was applied to the surface of the magnetic layer of the magnetic original fabric after storage at a rate such that the amount of lubricant retained after drying the solvent was 100 mg/m2, and after drying, a 19 mm width A magnetic tape was produced by slitting the material into slits.
【００２５】＜使用潤滑剤＞実施例１；フツ素系潤滑剤
（デユポン社製の商品名ＫＲＹＴＯＸ−１４３ＡＺ）実
施例２；フツ素系潤滑剤
（デユポン社製の商品名ＫＲＹＴＯＸ−１４３ＡＡ）実
施例３；シリコーン系潤滑剤
（信越化学工業社製の商品名ＫＦ９６−１０）実施例４
；シリコーン系潤滑剤
（信越化学工業社製の商品名ＫＦ９６−２０）比較例１
；フツ素系潤滑剤
（デユポン社製の商品名ＫＲＹＴＯＸ−１４３ＡＹ）比
較例２；フツ素系潤滑剤
（デユポン社製の商品名ＫＲＹＴＯＸ−１４３ＡＢ）比
較例３；フツ素系潤滑剤
（信越化学工業社製の商品名ＫＦ９６−５０）比較例４
；シリコーン系潤滑剤
（信越化学工業社製の商品名ＫＦ９６−１００）比較例
５；２−エチルヘキシルミリステート<Lubricant used> Example 1: Fluorine-based lubricant (trade name: KRYTOX-143AZ, manufactured by DuPont) Example 2: Fluorine-based lubricant (trade name: KRYTOX-143AA, manufactured by DuPont) Example 3; Silicone lubricant (trade name KF96-10 manufactured by Shin-Etsu Chemical Co., Ltd.) Example 4
; Silicone lubricant (trade name KF96-20 manufactured by Shin-Etsu Chemical Co., Ltd.) Comparative Example 1
; Fluorine-based lubricant (product name KRYTOX-143AY manufactured by DuPont) Comparative example 2; Fluorine-based lubricant (product name KRYTOX-143AB manufactured by DuPont) Comparative example 3; Fluorine-based lubricant (product name KRYTOX-143AB manufactured by DuPont) (Product name: KF96-50) Comparative Example 4
; Silicone lubricant (trade name KF96-100 manufactured by Shin-Etsu Chemical Co., Ltd.) Comparative Example 5; 2-ethylhexyl myristate
【００２６】上記
の実施例および比較例の各磁気テープを、中央部に溝を
切つたドラムに巻き付けた状態で、接触圧２ｇ／ｃｍ２
にて３０ｍ／秒の速度でアモルフアス製磁気ヘツドに摺
接させ、磁性層が破壊するまでの時間を調べた。その結
果を、各潤滑剤の２５℃での粘度および表面張力の測定
値と共に、下記の表１に示す。Each of the magnetic tapes of the above examples and comparative examples was wound around a drum with a groove cut in the center, and a contact pressure of 2 g/cm2 was applied.
The magnetic layer was brought into sliding contact with an amorphous magnetic head at a speed of 30 m/sec, and the time required for the magnetic layer to break was measured. The results are shown in Table 1 below, along with the measured values of viscosity and surface tension at 25°C for each lubricant.
【００２７】[0027]
【表１】[Table 1]
【００２８】上表の結果から、２５℃での粘度が４０セ
ンチストークス以下で、かつ表面張力が２５ｄｙｎｅ／
ｃｍ以下である潤滑剤を用いたこの発明の磁気テープ（
実施例１〜４）は、いずれも非常にすぐれた対磁気ヘツ
ド摺動耐久性を示すことが判る。これに対し、粘度が規
定値を超える潤滑剤を用いた磁気テープ（比較例１〜４
）、ならびに表面張力が規定値を超える潤滑剤を用いた
磁気テープ（比較例５）は、ともに上記耐久性に著しく
劣ることが明らかである。From the results in the table above, it can be seen that the viscosity at 25° C. is 40 centistokes or less and the surface tension is 25 dyne/
The magnetic tape of the present invention (
It can be seen that Examples 1 to 4) all exhibit very excellent sliding durability against magnetic heads. In contrast, magnetic tapes using lubricants whose viscosity exceeds the specified value (Comparative Examples 1 to 4)
), and the magnetic tape using a lubricant whose surface tension exceeds the specified value (Comparative Example 5) are both clearly inferior in durability.
Claims (1)
摺接させる磁気記録媒体において、非磁性支持体上に形
成された磁性層に、２５℃での粘度が４０センチストー
クス以下で、かつ表面張力が２５ｄｙｎｅ／ｃｍ以下の
潤滑剤が保持されていることを特徴とする磁気記録媒体
。Claim 1: In a magnetic recording medium that is brought into sliding contact with a magnetic head at a speed of 20 m/sec or more, a magnetic layer formed on a non-magnetic support has a viscosity of 40 centistokes or less at 25°C and a surface A magnetic recording medium comprising a lubricant having a tension of 25 dyne/cm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7812191A JPH04238114A (en) | 1991-01-18 | 1991-01-18 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7812191A JPH04238114A (en) | 1991-01-18 | 1991-01-18 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04238114A true JPH04238114A (en) | 1992-08-26 |
Family
ID=13653054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7812191A Pending JPH04238114A (en) | 1991-01-18 | 1991-01-18 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04238114A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100698428B1 (en) * | 2004-05-26 | 2007-03-26 | 후지쯔 가부시끼가이샤 | Head Slider and Magnetic Recording Device |
-
1991
- 1991-01-18 JP JP7812191A patent/JPH04238114A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100698428B1 (en) * | 2004-05-26 | 2007-03-26 | 후지쯔 가부시끼가이샤 | Head Slider and Magnetic Recording Device |
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