JPH02148413A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH02148413A JPH02148413A JP30115388A JP30115388A JPH02148413A JP H02148413 A JPH02148413 A JP H02148413A JP 30115388 A JP30115388 A JP 30115388A JP 30115388 A JP30115388 A JP 30115388A JP H02148413 A JPH02148413 A JP H02148413A
- Authority
- JP
- Japan
- Prior art keywords
- lubricating agent
- magnetic recording
- recording medium
- magnetic
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 28
- 239000000314 lubricant Substances 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 150000002148 esters Chemical class 0.000 claims abstract description 16
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 12
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 10
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 10
- 239000010409 thin film Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000010408 film Substances 0.000 claims description 12
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 claims description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004544 sputter deposition Methods 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000007747 plating Methods 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000539 dimer Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- -1 i-alloys Chemical class 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001020 Au alloy Inorganic materials 0.000 description 1
- 229910002441 CoNi Inorganic materials 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910001096 P alloy Inorganic materials 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003353 gold alloy Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 239000010702 perfluoropolyether Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Landscapes
- Lubricants (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電子計算機の記憶装置、ＶＴＲ等に用いられ
る磁気ディスク、磁気テープ等における高密度記録に適
した金属薄膜型磁気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a metal thin film magnetic recording medium suitable for high-density recording on magnetic disks, magnetic tapes, etc. used in computer storage devices, VTRs, etc.
従来の技術
］バルト、ニッケル、鉄、またはそれらを主成分とする
強磁性金属薄膜を、真空蒸着、スパンタリング、イオン
ブレーティングなどの真空中製膜法によりポリエステル
フィルム、ポリイミドフィルムなどの高分子フィルムや
、アルミ合金板、ガラス板などから成る基板上に形成し
て成る強磁性金属薄膜型磁気記録媒体は、従来の塗布型
磁気記録媒体に比べて記録密度を飛躍的に向上せしめる
ことが可能であるか、反面、磁性層が非常に薄いこと、
媒体の表面平滑性を良好ならしめる必要があることなど
から、媒体の耐久信頼性を確保するために塗布型媒体と
は別の技術が必要となる。たとえば、電子計算機の外部
記憶装置に用いられる磁気ディスク装置においては、一
般に、磁気ディスク稼動時には磁気ヘッドがディスク面
より浮上し停止時にはディスク面に接触するいわゆるコ
ンタクトスタートストップ（Ｃ８Ｓ）方式が採用されて
いる。この場合、スタート時またはストップ時における
磁気ヘッドスライダ−とディスク表面との繰り返し接触
摺動に耐えるよう、通常、ディスク表面には基板表面の
テキスチャ加工によシ生じるおう突形状が設けられてお
シ、さらに、強磁性金属薄膜上には、グラファイト、５
１０２等を主体とする保護層と潤滑剤層とが設けられて
いる。[Conventional technology] Balt, nickel, iron, or ferromagnetic metal thin films containing these as main components are formed into polymer films such as polyester films and polyimide films by vacuum film forming methods such as vacuum evaporation, sputtering, and ion blating. Ferromagnetic metal thin film magnetic recording media formed on substrates made of aluminum alloy plates, glass plates, etc. can dramatically improve recording density compared to conventional coated magnetic recording media. On the other hand, the magnetic layer is very thin.
Since it is necessary to improve the surface smoothness of the medium, a technology different from that for coated media is required to ensure the durability and reliability of the medium. For example, magnetic disk drives used in external storage devices for computers generally employ the so-called contact start-stop (C8S) method, in which the magnetic head floats above the disk surface when the magnetic disk is in operation, and comes into contact with the disk surface when the magnetic disk is stopped. There is. In this case, in order to withstand repeated contact and sliding between the magnetic head slider and the disk surface when starting or stopping, the disk surface is usually provided with an embossed shape created by texturing the substrate surface. , Furthermore, on the ferromagnetic metal thin film, graphite, 5
A protective layer mainly composed of 102 or the like and a lubricant layer are provided.
そして、その潤滑剤層には、パーフロロポリエーテル系
のものの使用が提案されている（たとえば、米国特許３
，７７８，３０８号）。The use of perfluoropolyether-based lubricants has been proposed for the lubricant layer (for example, U.S. Pat.
, 778, 308).
また、上記とは用途が異なるが主として金属薄膜型磁気
テープの走行性、耐久性改善に効果があるとして直鎖の
飽和型パーフロロアルキル末端基を有するエステルを潤
滑剤に用いる提案もなされている（％開昭６２−４６４
３１号公報、特開昭６２−２５６２１８号公報）。In addition, although the application is different from the above, it has also been proposed to use esters with linear saturated perfluoroalkyl terminal groups as lubricants, as they are mainly effective in improving the running properties and durability of metal thin film magnetic tapes. (%Kasho 62-464
31, JP-A-62-256218).
発明が解決しようとする課題
磁気ディスクの場合、記録密度向上のためには、磁気ヘ
ッド浮上距離を低減せしめることが必要であるが、その
際、テキスチャ加工によシ生じる突起形状の高さを低減
して表面形状を平滑化せしめると、前記の各種の公知の
潤滑剤を使用した場合にＣ８Ｓ耐久性が悪くなシ実用に
供さなくなることが明らかになった。Problems to be Solved by the Invention In the case of magnetic disks, in order to improve the recording density, it is necessary to reduce the flying distance of the magnetic head. It has become clear that when the surface shape is smoothed by using the above-mentioned various known lubricants, the durability of C8S becomes poor and it becomes unusable.
そこで、本発明者らは、Ｃ８Ｓ耐久性を改善すべく潤滑
剤を中心に情意検討した結果、保護膜としてカーボン膜
を用いた場合に同一分子内に分岐した不飽和型フッ素化
炭化水素末端基と脂肪族炭化水素末端基とを有するエス
テル類がＣＳＳ耐久性向上に顕著な効果を有することを
見出した。Therefore, the present inventors conducted a study focusing on lubricants in order to improve C8S durability, and found that when using a carbon film as a protective film, branched unsaturated fluorinated hydrocarbon end groups within the same molecule It has been found that esters having an aliphatic hydrocarbon terminal group and an aliphatic hydrocarbon terminal group have a remarkable effect on improving CSS durability.
課題を解決するだめの手段
本発明は、非磁性支持体上に強磁性金属薄膜が形成され
ている磁気記録媒体において、前記強磁性金属薄膜上に
カーボン保護膜を介して潤滑剤層が形成され、この潤滑
剤層は分岐した不飽和型フッ素化炭化水素末端基と炭素
数８以上の脂肪族炭化水素末端基とを各１個以上有する
エステルを含有する潤滑剤により形成されていることを
特徴とする。Means for Solving the Problems The present invention provides a magnetic recording medium in which a ferromagnetic metal thin film is formed on a non-magnetic support, in which a lubricant layer is formed on the ferromagnetic metal thin film via a carbon protective film. , the lubricant layer is formed of a lubricant containing an ester having at least one branched unsaturated fluorinated hydrocarbon end group and one or more aliphatic hydrocarbon end groups having 8 or more carbon atoms. shall be.
本発明において、分岐した不飽和型フッ素化炭化水素末
端基とは、テトラフロロエチレンやヘキサフロロプロピ
レンを塩基あるいはフロリドイオンの存在下に極性溶媒
中でアニオン重合して得られるオリゴマー（二量体、二
量体等）から誘導されるバー７０ロアルキル基を骨格と
するもので、その骨格としては、たとえば、
等で示され、一般的には、下式で代表されるものであシ
ＣｎＦ２ｎ−１
通常、エーテル結合でアルキル基、アリール基。In the present invention, a branched unsaturated fluorinated hydrocarbon terminal group refers to an oligomer (dimer, dimer, CnF2n-1 has a backbone of a bar-70roalkyl group derived from CnF2n-1 , alkyl group, aryl group with ether bond.
アリールアルキル基等と結合された形で使用されるもの
であって、本発明においては、前記骨格にそれらが結合
されたものを分岐した不飽和形フッ素化炭化水素末端基
と称する。その代表例としてり、たとえば
ＣｎＦ２ｎ−１００（ＣＨ２）ｐ
ＣｎＦ２ｎ−１０−（ＣＨ２）ｑ
ＣｎＦ２ｎ −１”ＣｋＨ２に＋１）ｒ（ただし、ｐ＝
ｏ−３０，ｑ＝１−３０． ｒ＝１−２０゜ｋ＝２〜
４の各整数）
がある。It is used in a form bonded with an arylalkyl group, etc., and in the present invention, those bonded to the skeleton are referred to as branched unsaturated fluorinated hydrocarbon terminal groups. As a typical example, for example, CnF2n-100(CH2)p CnF2n-10-(CH2)q CnF2n -1"CkH2+1)r (however, p=
o-30, q=1-30. r=1-20゜k=2~
4 integers).
本発明に使用する前記エステルにおける脂肪族炭化水素
末端基としては、炭素数８以上の飽和または不飽和のも
のであってたとえば下記一般式で示されるものである。The aliphatic hydrocarbon end group in the ester used in the present invention is a saturated or unsaturated group having 8 or more carbon atoms, and is represented by the following general formula, for example.
この場合炭素数７以下では本発明の効果が得られない。In this case, if the number of carbon atoms is 7 or less, the effects of the present invention cannot be obtained.
ＣｔＨ２ｔ＋１（ｘ）ｕ
ＣｔＨ２ｔ−１（Ｘ）ｕ
ＣｔＨ２ｔ−３（Ｘへ
（ただし、Ｘは酸素または硫黄原子、ｔ＝Ｓ〜３０゜ｕ
＝ｏ〜１の各整数）
そして、前記エステルは、前記フッ素化炭化水素末端基
と前凪炭化水素末端基とが各１個以上、エステル結合で
結ばれた構造のものであシ、その代表例としては、たと
えば、
ＣｎＦ２ｎ−１０＠（ＣＨ２）ｐ−Ｃｏｏ−Ｃ５Ｈ２，
＋１ＣｎＦ２ｎ−１０＠（ＣＨ２）ｐ−ＯＣＯ−ＣｔＨ
２ｔ＋１ＣｎＦ２ｎ−１’○ＣｋＨ２に＋１）ｒ−ＯＣ
ＯＣｔＨ２ｔ＋１ＣｎＦ２ｎ−１０−（ＣＨ，） 、−
０ＣＯ−ＣＮ２ＣｎＦ２ｎ−１０＠（ＣＨ，）、、−Ｃ
ｏ０（ＣＨ２）６０ＣＯ−Ｃ，Ｎ２．、、。CtH2t+1(x)u CtH2t-1(X)u CtH2t-3(to
= each integer from o to 1) The ester has a structure in which one or more of the fluorinated hydrocarbon terminal group and one or more of the fluorinated hydrocarbon terminal groups are connected by an ester bond, and a representative thereof Examples include, for example, CnF2n-10@(CH2)p-Coo-C5H2,
+1CnF2n-10@(CH2)p-OCO-CtH
2t+1CnF2n-1'○CkH2 +1) r-OC
OCtH2t+1CnF2n-10-(CH,),-
0CO-CN2CnF2n-10@(CH,), -C
o0(CH2)60CO-C,N2. ,,.
（、Ｆ２ｎ−１Ｏ−（ＣＨ２）９−ＯＣＯ−（ＣＨ２）
２Ｓ（ＣＨ２）２−Ｃ００−（、Ｈ，、、、、ＣＨ０Ｃ
ＯＣ，Ｎ２．＋１
等がある。(,F2n-1O-(CH2)9-OCO-(CH2)
2S(CH2)2-C00-(,H,,,,CH0C
OC, N2. There are +1 etc.
本発明に使用する前記エステル中における各末端基の比
率としては、原子団量比率で、フッ素化炭化水素末端基
が２０〜９０チ、脂肪族炭化水素末端基が１０〜８０％
が適当である。この範囲外ではＣＳＳ耐久性改善効果が
得られ難い。The ratio of each terminal group in the ester used in the present invention is 20 to 90% of fluorinated hydrocarbon terminal groups and 10 to 80% of aliphatic hydrocarbon terminal groups in terms of atomic group ratio.
is appropriate. Outside this range, it is difficult to obtain the effect of improving CSS durability.
保護膜上には前記エステルを表面１−当たり０．０６〜
３００■、さらに好ましくは０．１〜１５０■の割合で
それらのみ、あるいは、他の潤滑剤、防錆剤等を添加し
て薄膜状に存在せしめる。また、その方法としては湿式
および乾式の公知の塗布法が適用可能である。The above-mentioned ester is applied on the protective film at a concentration of 0.06 to 100% per surface.
They may be present in the form of a thin film by themselves or by adding other lubricants, rust preventives, etc. at a ratio of 300 cm, more preferably 0.1 to 150 cm. In addition, known wet and dry coating methods are applicable.
本発明の効果は、前記エステルを含む潤滑剤層を、カー
ボン保護膜上に形成することによシ得られるものである
が、そのカーボン保護膜としては、スパッタリング、プ
ラズマＣＶＤ等の方法で得られるアモルファス状、グラ
ファイト状、ダイアモンド状、あるいはそれらの混合状
態、積層状態のカーボン薄膜が適用でき、その厚さとし
ては６０〜５００人が適当である。The effects of the present invention are obtained by forming a lubricant layer containing the ester on a carbon protective film, and the carbon protective film can be obtained by a method such as sputtering or plasma CVD. An amorphous, graphite, diamond-like, mixed or laminated carbon thin film can be used, and the appropriate thickness is 60 to 500.
強磁性金属薄膜としては、Ｃｏ−Ｎｉ 、Ｃｏ−Ｃｒ
。As the ferromagnetic metal thin film, Co-Ni, Co-Cr
.
Ｃｏ−Ｎｉ−Ｃｒ、Ｃｏ−Ｎ１−Ｐ、Ｆｅ−Ｃｏ、Ｆｅ
−Ｃｏ−Ｎｉ等の真空蒸着法、スパッタリング法、イオ
ンブレーティング法、メツキ法等により得られる薄膜が
使用でき、必要に応じて、Ｃｒ、Ｔｉ等の下地層を設け
ることも可能である。下地層を含めた強磁性金属薄膜の
厚みとしては５００〜５，０００人が適当である。なお
、強磁性金属薄膜とカーボン薄膜との間に、必要に応じ
て、Ｃｒ、Ｔｉ等の非磁性金属薄層、有機プラズマ重合
膜等を形成することも可能である。Co-Ni-Cr, Co-N1-P, Fe-Co, Fe
A thin film of -Co-Ni etc. obtained by a vacuum evaporation method, a sputtering method, an ion blating method, a plating method, etc. can be used, and if necessary, a base layer of Cr, Ti, etc. can be provided. The appropriate thickness of the ferromagnetic metal thin film including the underlayer is 500 to 5,000. Note that it is also possible to form a non-magnetic metal thin layer such as Cr or Ti, an organic plasma polymerized film, etc. between the ferromagnetic metal thin film and the carbon thin film, if necessary.
非磁性支持体としては、その素材として、Ａ／金合金Ｔ
ｉ合金等の金属、ガラス、セラミックス。The material for the non-magnetic support is A/gold alloy T.
Metals such as i-alloys, glass, and ceramics.
ポリエステル類、ポリイミド類、ポリアミドイミド類、
ポリカーボネート、ボリアリレート類等のプラスチック
ス等を主体とししその表面に必要に応じてＣｏ−Ｐメツ
キ、ポリイミドコーテイング膜等を形成させたものや、
表面にテキスチャリング加工で生じる微小粒状、山状、
波状等の突起を設けたものが使用でき、その形状として
はディス乙シート、フィルム、カード、 ドラム等目的
に応じて選定することができる。そしてそれらの支持体
の表面粗さとしては、最大高さＲｍａｘで１００〜６０
０人が適当である。Polyesters, polyimides, polyamideimides,
Those mainly made of plastics such as polycarbonate and polyarylates, with Co-P plating, polyimide coating, etc. formed on the surface as necessary,
Fine particles, mountain shapes, etc. that occur on the surface due to texturing processing.
Those with wavy or other protrusions can be used, and the shape can be selected depending on the purpose, such as a disc sheet, film, card, or drum. The surface roughness of those supports is 100 to 60 at the maximum height Rmax.
0 people is appropriate.
作 用
分岐した不飽和型フッ素化炭化水素末端基と炭素数８以
上の飽和または不飽和の脂肪族炭化水素末端基とを各１
個以上有するエステルを有する潤滑剤層は、カーボン保
護膜上において、理由は不明であるが、表面性の改良さ
れた高記録密度用の磁気記録媒体に対して良好なＣ８Ｓ
耐久性を示す。Function: One branched unsaturated fluorinated hydrocarbon end group and one saturated or unsaturated aliphatic hydrocarbon end group having 8 or more carbon atoms.
For reasons unknown, the lubricant layer containing esters having more than 100% of esters has good C8S properties on the carbon protective film for magnetic recording media for high recording density with improved surface properties.
Shows durability.
これは、フッ素化炭化水素末端基として直鎖の飽和パー
７０ロアルキル末端基を用いた場合には本発明で得られ
るよりなＣＳＳ耐久性が得られ難いことから、分岐した
不飽和フッ素化炭化水素末端基が主として性能改善の鍵
を握っているものと推定される。This is because it is difficult to obtain CSS durability higher than that obtained in the present invention when a linear saturated per-70-roalkyl terminal group is used as a fluorinated hydrocarbon terminal group. It is presumed that the terminal group mainly holds the key to performance improvement.
実施例
直径９５Ｂ、厚さ１．２態のＡ１合金板の表面に厚さ２
５７ｔｍの非磁性Ｎ１−Ｐ合金メツキを施こしテキスチ
ャ加工により平均粗さ６０人、最大高さ３００人の突起
を形成せしめたものを非磁性基板とし、その上にスパッ
タリングにょシ厚さ１，３００人のＣｒ下地と厚さ６０
０人のＣｏＮｉ強磁性金属薄膜を形成、さらにその上に
、スパッタリングにより厚さ２５０へのグラファイト保
護層を形成させたものを試料Ａとする。前記においてグ
ラファイト層の代シにプラズマＣＶＤ法により厚さ１ｏ
。Example: A thickness of 2 on the surface of an A1 alloy plate with a diameter of 95B and a thickness of 1.2.
A non-magnetic substrate was prepared by applying 57 tm non-magnetic N1-P alloy plating and texturing to form protrusions with an average roughness of 60 mm and a maximum height of 300 mm, and sputtering was performed on the non-magnetic substrate. Human Cr base and thickness 60
Sample A was prepared by forming a CoNi ferromagnetic metal thin film with a thickness of 250 mm, and then forming a graphite protective layer thereon to a thickness of 250 mm by sputtering. In the above, the graphite layer was formed to a thickness of 10 by plasma CVD method.
.
入のダイアモンドライクカーボン保護層を形成させたも
のを試料Ｂとする。また、カーボン保護層のないものを
試料Ｃとする。Specimen B is a sample on which a diamond-like carbon protective layer is formed. Sample C is a sample without a carbon protective layer.
これらの各試料に、各種のエステルを各々別々に種々の
膜厚に塗布したものＫつきＣ８Ｓ測定を行なった。Ｃ３
Ｓ耐久性としては、摩擦係数がｊ、ｏを超えた時点のＣ
５Ｓ回数″！たけヘッドクラッシュ発生時のＣ８Ｓ回数
で評価し、これらの時点をＣＳＳ寿命とした。これらの
結果を第１表Ｋまとめて示す。なお、実験例（１１）〜
（１６）は比較例である。Each of these samples was coated with various esters at various thicknesses and subjected to C8S measurement with K. C3
S durability is C when the friction coefficient exceeds j and o.
The number of 5S'! TAKE was evaluated based on the number of C8S when a head crash occurred, and these points were defined as the CSS life.These results are summarized in Table 1K.In addition, experimental examples (11) to
(16) is a comparative example.
第１表よシ、フッ素化炭化水素末端基のないエステルの
場合〔実験例（１６））、脂肪族炭化水素末端基のない
エステルの場合〔実験例（１１））あるいはその炭素数
が７以下の場合〔実験例（１２） ）、カーボン保護膜
がない場合〔実験例（１５））、エステルの存在量がｏ
、 ０５ ｒｒｑ／ｌｒ？以下の場合〔実験例（１４
）〕、フッ素化炭化水素が直鎖飽和型である場合〔実験
例（１３））においてはＣＳＳ性能が悪いが、本発明の
特許請求の範囲内であればすべて〔実験例（１）〜（１
０））良好なＣ８Ｓ試験結果が得られていることがわか
る。According to Table 1, in the case of esters without fluorinated hydrocarbon end groups [Experimental Example (16)], in the case of esters without aliphatic hydrocarbon end groups [Experimental Example (11)), or whose carbon number is 7 or less. [Experimental example (12)), when there is no carbon protective film [Experimental example (15)], the amount of ester present is o.
, 05 rrq/lr? In the following case [Experimental example (14)
)], CSS performance is poor in the case where the fluorinated hydrocarbon is a linear saturated type [Experimental Example (13)), but as long as it is within the scope of the claims of the present invention, all [Experimental Examples (1) to ( 1
0)) It can be seen that good C8S test results were obtained.
発明の効果
本発明によれば、記録密度向上のため表面粗さを減少せ
しめて表面性をかなシ良好ならしめてもＣ８Ｓ性能が低
下せず良好な耐久信頼性を有する磁気記録媒体を得るこ
とができるため、本発明は工業的に価値の高いものであ
る。Effects of the Invention According to the present invention, it is possible to obtain a magnetic recording medium that does not deteriorate in C8S performance and has good durability and reliability even when the surface roughness is reduced to improve the surface properties in order to improve the recording density. Therefore, the present invention is of high industrial value.
Claims (1)
記録媒体において、前記強磁性金属薄膜上にカーボン保
護膜を介して潤滑剤層が形成され、この潤滑剤層は分岐
した不飽和型フッ素化炭化水素末端基と炭素数８以上の
脂肪族炭化水素末端基とを各１個以上有するエステルを
含有する潤滑剤により形成されていることを特徴とする
磁気記録媒体。In a magnetic recording medium in which a ferromagnetic metal thin film is formed on a non-magnetic support, a lubricant layer is formed on the ferromagnetic metal thin film via a carbon protective film, and this lubricant layer is a branched unsaturated type lubricant layer. 1. A magnetic recording medium comprising a lubricant containing an ester having at least one fluorinated hydrocarbon terminal group and one or more aliphatic hydrocarbon terminal groups having 8 or more carbon atoms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63301153A JPH07114017B2 (en) | 1988-11-29 | 1988-11-29 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63301153A JPH07114017B2 (en) | 1988-11-29 | 1988-11-29 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02148413A true JPH02148413A (en) | 1990-06-07 |
| JPH07114017B2 JPH07114017B2 (en) | 1995-12-06 |
Family
ID=17893421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63301153A Expired - Lifetime JPH07114017B2 (en) | 1988-11-29 | 1988-11-29 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07114017B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5510513A (en) * | 1993-04-05 | 1996-04-23 | Matsushita Electric Industrial Co., Ltd. | Fluorine containing diester of alkyl-or alkenylsuccinic acid, preparation thereof and magnetic recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62172520A (en) * | 1986-01-25 | 1987-07-29 | Sony Corp | Magnetic recording medium |
-
1988
- 1988-11-29 JP JP63301153A patent/JPH07114017B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62172520A (en) * | 1986-01-25 | 1987-07-29 | Sony Corp | Magnetic recording medium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5510513A (en) * | 1993-04-05 | 1996-04-23 | Matsushita Electric Industrial Co., Ltd. | Fluorine containing diester of alkyl-or alkenylsuccinic acid, preparation thereof and magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07114017B2 (en) | 1995-12-06 |
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