JPH064857A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH064857A JPH064857A JP18587392A JP18587392A JPH064857A JP H064857 A JPH064857 A JP H064857A JP 18587392 A JP18587392 A JP 18587392A JP 18587392 A JP18587392 A JP 18587392A JP H064857 A JPH064857 A JP H064857A
- Authority
- JP
- Japan
- Prior art keywords
- lubricant
- layer
- magnetic
- polar group
- molecular end
- 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- Withdrawn
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Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は磁気記録媒体に関し、
さらに詳しくは、電磁変換特性が良好で走行耐久性に優
れた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,
More specifically, it relates to a magnetic recording medium having good electromagnetic conversion characteristics and excellent running durability.
【0002】[0002]
【従来の技術】一般に、強磁性材を真空蒸着等によって
基体上に被着してつくられる磁気記録媒体は、磁気ヘッ
ド等と接触しながら走行するため、磁性層の摩擦係数が
小さくまた摩耗が少なくて走行耐久性に優れていること
が要求される。2. Description of the Related Art Generally, a magnetic recording medium prepared by depositing a ferromagnetic material on a substrate by vacuum deposition or the like runs while contacting with a magnetic head or the like, so that the magnetic layer has a small friction coefficient and wear. It is required to be small and have excellent running durability.
【0003】このため、従来から磁性層上に種々の潤滑
剤層を設けて、摩擦係数を低減し、走行耐久性を改善す
ることが行われており、たとえば、カルボン酸パ−フル
オロアルキルエステルおよびパ−フルオロポリエ−テル
よりなる潤滑剤層を磁性層上に設けることが行われてい
る。(特公昭62−236118号)Therefore, various lubricant layers have conventionally been provided on the magnetic layer to reduce the friction coefficient and improve the running durability. For example, carboxylic acid perfluoroalkyl ester and A lubricant layer made of perfluoropolyether is provided on the magnetic layer. (Japanese Patent Publication No. 62-236118)
【0004】[0004]
【発明が解決しようとする課題】ところが、この種のカ
ルボン酸パ−フルオロアルキルエステルおよびパ−フル
オロポリエ−テルは、分子末端に極性基を有せず、これ
らからなる潤滑剤層を磁性層上に形成すると、摩擦係数
が低減されて走行耐久性が改善されるものの、磁性層表
面との相互作用が充分ではないため、磁気ヘッドと摺接
する際、潤滑剤が磁性層表面から離脱しやすく、離脱し
た潤滑剤で磁気ヘッドの摺接面が汚れて、記録再生時の
出力を劣化させるという難点がある。However, this kind of carboxylic acid perfluoroalkyl ester and perfluoropolyether do not have a polar group at the terminal of the molecule, and a lubricant layer made of them is placed on the magnetic layer. If formed, the friction coefficient is reduced and the running durability is improved, but since the interaction with the magnetic layer surface is not sufficient, the lubricant is likely to separate from the magnetic layer surface during sliding contact with the magnetic head, There is a problem that the slidable contact surface of the magnetic head is contaminated with the removed lubricant and the output during recording and reproduction is deteriorated.
【0005】[0005]
【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、磁性層上
に、分子末端に極性基を有する潤滑剤と分子末端に極性
基を有しない潤滑剤とからなる潤滑剤層を設け、分子末
端に極性基を有する潤滑剤を分子末端に極性基を有しな
い潤滑剤より潤滑剤層の厚さ方向で磁性層側より表面側
に多くすることによって、潤滑剤の磁性層表面からの離
脱を抑制し、離脱した潤滑剤による磁気ヘッド摺接面の
汚れを防止すると同時に、潤滑剤の優れた潤滑効果を充
分に発揮させ、記録再生時の出力を劣化させることな
く、走行耐久性を充分に向上させたものである。SUMMARY OF THE INVENTION The present invention has been made as a result of various investigations in view of the present circumstances. A lubricant having a polar group at the molecular end and a polar group at the molecular end on the magnetic layer are not provided. Provide a lubricant layer consisting of a lubricant, and make the lubricant having polar groups at the molecular ends more on the surface side than the magnetic layer side in the thickness direction of the lubricant layer than lubricants not having polar groups at the molecular ends. Prevents the lubricant from separating from the surface of the magnetic layer and prevents the separated lubricant from contaminating the sliding surface of the magnetic head. At the same time, the lubricant's excellent lubricating effect is fully exerted, and the output during recording and reproduction is improved. The running durability is sufficiently improved without deteriorating.
【0006】この発明によれば、磁性層上に設けられた
潤滑剤層が、分子末端に極性基を有する潤滑剤と分子末
端に極性基を有しない潤滑剤とで構成されているため、
分子末端に極性基を有しこの極性基で磁性層表面へ吸着
している潤滑剤への外部からの負荷応力が、分子末端に
極性基を有せずに自由に動く潤滑剤によって緩和され
る。また、分子末端に極性基を有する潤滑剤を分子末端
に極性基を有しない潤滑剤より潤滑剤層の厚さ方向で磁
性層側より表面側に多くしているため、分子末端に極性
基を有する潤滑剤がお互いに多量体を形成しやすくな
り、分子末端に極性基を有しない潤滑剤が脱離するのを
防止する障壁の役割をする。According to the present invention, since the lubricant layer provided on the magnetic layer is composed of a lubricant having a polar group at the molecular end and a lubricant having no polar group at the molecular end,
The external load stress on the lubricant that has a polar group at the molecular end and is adsorbed to the magnetic layer surface by this polar group is mitigated by the freely moving lubricant that does not have a polar end at the molecular end. . In addition, since the lubricant having a polar group at the molecular end is made to be more on the surface side than the magnetic layer side in the thickness direction of the lubricant layer than the lubricant not having a polar group at the molecular end, the polar group is added to the molecular end. The lubricants have a tendency to form multimers with each other, and serve as a barrier for preventing the lubricant having no polar group at the molecular end from being eliminated.
【0007】しかして、分子末端に極性基を有する潤滑
剤による障壁効果と、分子末端に極性基を有しない潤滑
剤による応力緩和効果が同時に発生し、潤滑剤の磁性層
表面からの離脱が効果的に抑制されて、磁気ヘッドの摺
接面の汚れも充分に抑制され、記録再生時の出力が劣化
することなく、併用する潤滑剤の優れた潤滑効果が充分
に発揮されて、走行耐久性が充分に向上される。However, the barrier effect of the lubricant having the polar group at the molecular end and the stress relaxation effect of the lubricant having no polar group at the end of the molecule simultaneously occur, and the lubricant is released from the surface of the magnetic layer. Of the magnetic head, the dirt on the sliding contact surface of the magnetic head is also sufficiently suppressed, the output during recording and reproduction does not deteriorate, and the excellent lubricating effect of the lubricant used in combination is sufficiently exerted to improve running durability. Is sufficiently improved.
【0008】このように、分子末端に極性基を有する潤
滑剤を分子末端に極性基を有しない潤滑剤より潤滑剤層
の厚さ方向で磁性層側より表面側に多くした潤滑剤層を
形成するには、これらの潤滑剤をそれぞれメチルエチル
ケトン、n−ヘキサン、イソプロピルアルコ−ル、フレ
オンなどの有機溶剤に溶解し、まず分子末端に極性基を
有しない潤滑剤を溶解した溶液を基体表面に形成された
磁性層上に塗布または噴霧し、この上にさらに分子末端
に極性基を有する潤滑剤を溶解した溶液を塗布または噴
霧するなどの方法で行われる。As described above, a lubricant layer having a polar group at the molecular end is formed more in the thickness direction of the lubricant layer than on the lubricant having no polar group at the molecular end on the surface side rather than the magnetic layer side. In order to do so, each of these lubricants is dissolved in an organic solvent such as methyl ethyl ketone, n-hexane, isopropyl alcohol, and Freon, and a solution having a polar group-free lubricant is first formed on the surface of the substrate. It is carried out by a method such as coating or spraying on the formed magnetic layer, and further coating or spraying on it a solution in which a lubricant having a polar group at the molecular end is dissolved.
【0009】また、この他、分子末端に極性基を有しな
い潤滑剤を溶解した溶液を基体表面に形成された磁性層
上に塗布または噴霧し、一方、分子末端に極性基を有す
る潤滑剤を溶解した溶液を基体の裏面に塗布または噴霧
した後、この磁気記録媒体原反を巻き取った状態でキュ
アリングして、分子末端に極性基を有しない潤滑剤を被
着した磁性層上に、基体裏面に被着した分子末端に極性
基を有する潤滑剤を転移させるなどの方法でも行われ、
方法は特に限定されない。In addition, a solution in which a lubricant having no polar group at the molecular end is dissolved is applied or sprayed on the magnetic layer formed on the surface of the substrate, while a lubricant having a polar group at the molecular end is applied. After coating or spraying the dissolved solution on the back surface of the substrate, the magnetic recording medium raw material is cured in a wound state, and on the magnetic layer coated with a lubricant having no polar group at the molecular end, It is also carried out by a method such as transferring a lubricant having a polar group to the molecular end attached to the back surface of the substrate,
The method is not particularly limited.
【0010】このようにして形成される潤滑剤層は、磁
性層上に、分子末端に極性基を有する潤滑剤を0.01〜1
0mg/m2 の範囲内で被着させ、分子末端に極性基を
有しない潤滑剤を0.01〜10mg/m2 の範囲内で被着
させたものであることが好ましく、分子末端に極性基を
有する潤滑剤が0.01mg/m2 より少なくては走行耐久
性が充分でなく、10mg/m2 より多いと磁気テ−プ
としたとき磁気テ−プが張りつき現象を起こす。また、
分子末端に極性基を有しない潤滑剤が0.01mg/m2 よ
り少なくては走行耐久性が充分でなく、10mg/m2
より多いと磁気ヘッドの摺接面が汚れて出力の劣化を生
じる。The lubricant layer thus formed contains 0.01 to 1 of a lubricant having a polar group at the molecular end on the magnetic layer.
It is preferable that the lubricant is applied in the range of 0 mg / m 2 and a lubricant having no polar group at the molecular end is applied in the range of 0.01 to 10 mg / m 2 , and the polar group is attached to the molecular end. If the amount of the lubricant contained is less than 0.01 mg / m 2 , the running durability is insufficient, and if it exceeds 10 mg / m 2 , the magnetic tape causes a sticking phenomenon when it is used as a magnetic tape. Also,
If the amount of lubricant that does not have a polar group at the molecular end is less than 0.01 mg / m 2 , running durability is not sufficient and 10 mg / m 2
If it is more, the sliding surface of the magnetic head becomes dirty and the output deteriorates.
【0011】分子末端に極性基を有する潤滑剤として
は、フッ素系潤滑剤として、たとえば、市販品のデュポ
ン社製;クライトックス、モンテカチ−ニ社製;フォン
ブリンZ−DEAL,フォンブリンZ−DOL,フォン
ブリンZ−DIAC,フォンブリンZ−DISOC,フ
ォンブリンZ−AM2001などが好適なものとして挙
げられ、炭化水素系潤滑剤としては、ステアリン酸、パ
ルミチン酸などの脂肪酸およびこれら脂肪酸のアミド,
エステル,アルコ−ルなどが好適なものとして挙げられ
る。Examples of the lubricant having a polar group at the molecular end include fluorine-based lubricants such as commercially available products from DuPont; Krytox and Montecatini; Fomblin Z-DEAL and Fomblin Z-DOL. , Fomblin Z-DIAC, Fomblin Z-DISOC, Fomblin Z-AM2001 and the like are preferable, and examples of the hydrocarbon lubricant include fatty acids such as stearic acid and palmitic acid, and amides of these fatty acids,
Esters, alcohols and the like are preferred.
【0012】また、分子末端に極性基を有しない潤滑剤
としては、カルボン酸パ−フルオロアルキルエステル、
ステアリン酸パ−フルオロオクチルなどのフッ素化合物
と炭化水素化合物の変性物、ステアリン酸ノルマルブチ
ル、オレイン酸オレイルなどの炭化水素化合物、シリコ
ンオイルなどが好適なものとして挙げられる。Further, as the lubricant having no polar group at the molecular end, carboxylic acid perfluoroalkyl ester,
Preferred examples include modified products of fluorine compounds and hydrocarbon compounds such as perfluorooctyl stearate, hydrocarbon compounds such as normal butyl stearate and oleyl oleate, and silicone oil.
【0013】磁性層の形成は、Fe、Co、Ni、Co
−Ni、Co−Cr、Fe−Ni、Fe−Co、Co−
P、Co−Pt、Fe−Co−B、Co−Ni−Fe−
B、Fe−Co−Ni、Co−Ni−Pt、Co−Ni
−Pなどの強磁性材、さらにこれらに微量の希土類金属
を含ませた強磁性材を、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 magnetic layer is formed of Fe, Co, Ni, Co
-Ni, Co-Cr, Fe-Ni, Fe-Co, Co-
P, Co-Pt, Fe-Co-B, Co-Ni-Fe-
B, Fe-Co-Ni, Co-Ni-Pt, Co-Ni
A ferromagnetic material such as -P, or a ferromagnetic material containing a trace amount of a rare earth metal, is deposited on the substrate by a method such as vacuum deposition, ion plating, sputtering or plating. It
【0014】このようにして形成される磁性層上に前記
の潤滑剤を形成する場合、磁性層は、表面に微量の水分
が付着していてもよく、さらに、ベンゾトリアゾ−ル系
等の防錆剤を塗布したものや、真空蒸着、スパッタリン
グ、プラズマ等で有機化合物や炭素や酸化珪素などから
なる保護膜層を設けたものであってもよい。また、極圧
剤などを保護膜層中に添加してもよい。When the above-mentioned lubricant is formed on the magnetic layer thus formed, a slight amount of water may be attached to the surface of the magnetic layer. It may be one coated with an agent or one provided with a protective film layer made of an organic compound, carbon, silicon oxide or the like by vacuum vapor deposition, sputtering, plasma or the like. Further, an extreme pressure agent or the like may be added to the protective film layer.
【0015】また、表面に磁性層を形成した基体の裏面
にバックコ−ト層を設けてもよく、このバックコ−ト層
は、カ−ボンブラック、炭酸カルシウムなどの非磁性粉
末を、塩化ビニル−酢酸ビニル系共重合体、ウレタン系
樹脂、繊維素系樹脂等の結合剤樹脂および有機溶剤等と
ともに混合分散してバックコ−ト層用塗料を調製し、こ
のバックコ−ト層用塗料を表面に磁性層を形成した基体
の裏面に、塗布、乾燥して形成される。このバックコ−
ト層中には極圧剤などを添加してもよい。A back coat layer may be provided on the back surface of the substrate having a magnetic layer formed on the front surface. The back coat layer contains a non-magnetic powder such as carbon black or calcium carbonate and vinyl chloride- A coating material for a back coat layer is prepared by mixing and dispersing it with a binder resin such as a vinyl acetate copolymer, a urethane resin, a fibrin resin and an organic solvent, and the coating material for the back coat layer is magnetic on the surface. It is formed by coating and drying on the back surface of the layered substrate. This back cover
An extreme pressure agent or the like may be added to the coating layer.
【0016】磁気記録媒体としては、ポリエチレンテレ
フタレ−ト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
形態を包含する。As the magnetic recording medium, there are various magnetic tapes having a synthetic resin film such as a polyethylene terephthalate 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. Including the form of.
【0017】[0017]
【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
真空蒸着装置に装填し、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
フィルムの表面に、Co−Ni−O(Co:Ni=8
0:20)からなる厚さ 0.2μmの磁性層を形成した。EXAMPLES Next, examples of the present invention will be described. Example 1 A polyethylene terephthalate film having a thickness of 10 μm was loaded in a vacuum vapor deposition apparatus, and a Co—Ni alloy was heated and evaporated under a residual gas pressure of 5 × 10 −5 torr of oxygen gas to continuously evaporate the Co—Ni alloy. Obliquely incident on the surface of the polyethylene terephthalate film, and Co-Ni-O (Co: Ni = 8
0:20) to form a magnetic layer having a thickness of 0.2 μm.
【0018】次いで、ポリエチレンテレフタレ−トフィ
ルムの表面に形成された磁性層上に、カルボン酸パ−フ
ルオロアルキルエステルの 0.5重量%フレオン溶液を、
被着量が 0.5mg/m2 となるように塗布した後、さら
にポリエチレンテレフタレ−トフィルムの裏面に、フォ
ンブリンZ−DOLの 0.5重量%フレオン溶液を、被着
量が 1.5mg/m2 となるように塗布して潤滑剤層を形
成した。次ぎに、この磁気記録媒体原反を巻き取った状
態で、60℃で、24時間キュヲリング処理した後、8
mm幅にスリットして磁気テ−プを作製した。Then, on the magnetic layer formed on the surface of the polyethylene terephthalate film, a 0.5% by weight freon solution of carboxylic acid perfluoroalkyl ester was added.
After coating so that the coating amount was 0.5 mg / m 2 , a 0.5 wt% Freon solution of Fomblin Z-DOL was further coated on the back surface of the polyethylene terephthalate film so that the coating amount was 1.5 mg / m 2 . To form a lubricant layer. Next, after the raw material of the magnetic recording medium was wound up, a curling treatment was performed at 60 ° C. for 24 hours, and then 8
A magnetic tape was produced by slitting it into a width of mm.
【0019】得られた磁気テ−プの表面を角度分解法に
よって、20°と80°でESCA分析した結果、潤滑
剤層の表面側において、フォンブリンZ−DOL(a)
とカルボン酸パ−フルオロアルキルエステル(b)との
比率a/bは、20°の分析で12、80°の分析で3
4であり、潤滑層の表面側でフォンブリンZ−DOLの
割合が多かった。The surface of the obtained magnetic tape was subjected to ESCA analysis at 20 ° and 80 ° by an angle resolution method. As a result, it was found that Fomblin Z-DOL (a) was found on the surface side of the lubricant layer.
The ratio a / b of the carboxylic acid perfluoroalkyl ester (b) is 12 in the analysis at 20 ° and 3 in the analysis at 80 °.
4, and the proportion of Fomblin Z-DOL was high on the surface side of the lubricating layer.
【0020】実施例2 実施例1における潤滑剤層の形成において、カルボン酸
パ−フルオロアルキルエステルの 0.5重量%フレオン溶
液に代えて、ステアリン酸ノルマルブチルの 0.5重量%
イソプロピルアルコ−ル溶液を被着量が 0.5mg/m2
となるように塗布し、フォンブリンZ−DOLの 0.5重
量%フレオン溶液に代えて、フォンブリンZ−DEAL
の 0.5重量%フレオン溶液を被着量が 1.5mg/m2 と
なるように塗布した以外は、実施例1と同様にして潤滑
剤層を形成し、磁気テ−プを作製した。Example 2 In the formation of the lubricant layer in Example 1, 0.5% by weight of normal butyl stearate was used instead of 0.5% by weight of Freon solution of perfluoroalkyl carboxylic acid.
The amount of isopropyl alcohol solution deposited is 0.5 mg / m 2
Fomblin Z-DAL was replaced with a 0.5 wt% Freon solution of Fomblin Z-DOL instead of Fomblin Z-DEAL.
A lubricant layer was formed in the same manner as in Example 1 except that the 0.5 wt% Freon solution was applied so that the coating amount was 1.5 mg / m 2, and a magnetic tape was produced.
【0021】得られた磁気テ−プの表面を角度分解法に
よって、20°と80°でESCA分析した結果、潤滑
剤層の表面側において、フォンブリンZ−DEAL
(a)とステアリン酸ノルマルブチル(b)との比率a
/bは、20°の分析で7、80°の分析で18であ
り、潤滑層の表面側でフォンブリンZ−DEALの割合
が多かった。The surface of the obtained magnetic tape was subjected to ESCA analysis at 20 ° and 80 ° by an angle resolution method. As a result, it was found that Fomblin Z-DEAL was found on the surface side of the lubricant layer.
Ratio a between (a) and normal butyl stearate (b)
/ B was 7 in the analysis of 20 ° and 18 in the analysis of 80 °, and the proportion of Fomblin Z-DEAL was high on the surface side of the lubricating layer.
【0022】実施例3 実施例1における潤滑剤層の形成において、カルボン酸
パ−フルオロアルキルエステルの被着量を 0.5mg/m
2 から 1.0mg/m2 に変更した以外は、実施例1と同
様にして磁気テ−プを作製した。Example 3 In the formation of the lubricant layer in Example 1, the deposition amount of carboxylic acid perfluoroalkyl ester was 0.5 mg / m 2.
A magnetic tape was produced in the same manner as in Example 1 except that the amount was changed from 2 to 1.0 mg / m 2 .
【0023】得られた磁気テ−プの表面を角度分解法に
よって、20°と80°でESCA分析した結果、潤滑
剤層の表面側において、フォンブリンZ−DOL(a)
とカルボン酸パ−フルオロアルキルエステル(b)との
比率a/bは、20°の分析で9、80°の分析で17
であり、潤滑層の表面側でフォンブリンZ−DOLの割
合が多かった。The surface of the magnetic tape thus obtained was subjected to ESCA analysis at 20 ° and 80 ° by an angle resolution method. As a result, it was found that Fomblin Z-DOL (a) was found on the surface side of the lubricant layer.
The ratio a / b of the carboxylic acid perfluoroalkyl ester (b) is 9 in the analysis at 20 ° and 17 in the analysis at 80 °.
And the proportion of Fomblin Z-DOL was high on the surface side of the lubricating layer.
【0024】比較例1 実施例1と同様にしてポリエチレンテレフタレ−トフィ
ルムの表面に磁性層を形成した。次いで、ポリエチレン
テレフタレ−トフィルムの表面に形成された磁性層上
に、フォンブリンZ−DOLの 0.5重量%フレオン溶液
を被着量が 1.5mg/m2となるように塗布した後、さ
らにポリエチレンテレフタレ−トフィルムの裏面に、カ
ルボン酸パ−フルオロアルキルエステルの 0.5重量%フ
レオン溶液を被着量が 0.5mg/m2 となるように塗布
して潤滑剤層を形成した。次ぎに、この磁気記録媒体原
反を巻き取った状態で、60℃で、24時間キュヲリン
グ処理した後、8mm幅にスリットして磁気テ−プを作
製した。Comparative Example 1 In the same manner as in Example 1, a magnetic layer was formed on the surface of the polyethylene terephthalate film. Then, a 0.5 wt% Freon solution of fomblin Z-DOL was applied on the magnetic layer formed on the surface of the polyethylene terephthalate film so that the applied amount was 1.5 mg / m 2, and then polyethylene terephthalate was further added. A 0.5 wt% Freon solution of a carboxylic acid perfluoroalkyl ester was applied to the back surface of the tarte film so that the amount of coating was 0.5 mg / m 2 to form a lubricant layer. Next, in the state in which this raw material of the magnetic recording medium was wound, a curling treatment was performed at 60 ° C. for 24 hours, and then a slit was formed into a width of 8 mm to produce a magnetic tape.
【0025】得られた磁気テ−プの表面を角度分解法に
よって、20°と80°でESCA分析した結果、潤滑
剤層の表面側において、フォンブリンZ−DOL(a)
とカルボン酸パ−フルオロアルキルエステル(b)との
比率a/bは、20°の分析で1/38、80°の分析
で1/26であり、潤滑層の表面側でフォンブリンZ−
DOLの割合が少なかった。The surface of the obtained magnetic tape was subjected to ESCA analysis at 20 ° and 80 ° by an angle resolution method. As a result, on the surface side of the lubricant layer, Fomblin Z-DOL (a) was obtained.
The ratio a / b of the carboxylic acid perfluoroalkyl ester (b) was 1/38 in the analysis at 20 ° and 1/26 in the analysis at 80 °, and Fomblin Z- at the surface side of the lubricating layer.
The proportion of DOL was low.
【0026】比較例2 実施例1と同様にしてポリエチレンテレフタレ−トフィ
ルムの表面に磁性層を形成した。次いで、ポリエチレン
テレフタレ−トフィルムの表面に形成された磁性層上
に、フォンブリンZ−DEALの 0.5重量%フレオン溶
液を、被着量が 1.5mg/m2 となるように塗布した
後、さらに、ポリエチレンテレフタレ−トフィルムの裏
面に、ステアリン酸ノルマルブチルの 0.5重量%イソプ
ロピルアルコ−ル溶液を、被着量が 0.5mg/m2 とな
るように塗布して潤滑剤層を形成した。次ぎに、この磁
気記録媒体原反を巻き取った状態で、60℃で、24時
間キュヲリング処理した後、8mm幅にスリットして磁
気テ−プを作製した。Comparative Example 2 A magnetic layer was formed on the surface of a polyethylene terephthalate film in the same manner as in Example 1. Then, on the magnetic layer formed on the surface of the polyethylene terephthalate film, a 0.5 wt% Freon solution of fomblin Z-DEAL was applied so that the coating amount was 1.5 mg / m 2, and then, On the back surface of the polyethylene terephthalate film, a 0.5 wt% isopropyl alcohol solution of normal butyl stearate was applied so that the amount of the adhered amount would be 0.5 mg / m 2 , to form a lubricant layer. Next, in a state in which this raw material of the magnetic recording medium was wound up, a curling treatment was carried out at 60 ° C. for 24 hours and then a magnetic tape was produced by slitting it into a width of 8 mm.
【0027】得られた磁気テ−プの表面を角度分解法に
よって、20°と80°でESCA分析した結果、潤滑
剤層の表面側において、フォンブリンZ−DEAL
(a)とステアリン酸ノルマルブチル(b)との比率a
/bは、20°の分析で1/20、80°の分析で1/
16であり、潤滑層の表面側でフォンブリンZ−DEA
Lの割合が少なかった。The surface of the obtained magnetic tape was subjected to ESCA analysis at 20 ° and 80 ° by an angle resolution method. As a result, it was found that Fomblin Z-DEAL was found on the surface side of the lubricant layer.
Ratio a between (a) and normal butyl stearate (b)
/ B is 1/20 for 20 ° analysis and 1 / for 80 ° analysis
16 and Fomblin Z-DEA on the surface side of the lubricating layer
The proportion of L was low.
【0028】各実施例および比較例で得られた磁気テ−
プについて、下記の要領でスチル寿命、磁気ヘッド汚れ
および出力劣化を調べた。The magnetic tape obtained in each Example and Comparative Example
With respect to the magnetic tape, the still life, magnetic head contamination, and output deterioration were examined in the following manner.
【0029】<スチル寿命>市販のVTRデッキを改造
したスチル試験機を用い、常温、常湿下で磁気テ−プを
スチルモ−ドで再生し、再生出力レベルが初期出力レベ
ルの1/2に低下するまでに要した時間を測定した。<Still life> Using a still tester which is a remodeled commercial VTR deck, the magnetic tape is reproduced in still mode at room temperature and normal humidity, and the reproduction output level becomes half of the initial output level. The time required for the decrease was measured.
【0030】<磁気ヘッド汚れ>得られた120分長の
磁気テ−プを、VTRで100回走行させた後のヘッド
汚れを観察して、汚れが全く認められない場合を
(5)、汚れが僅かに認められる場合を(4)、汚れが
認められる場合を(3)、汚れがやや多く認められる場
合を(2)、汚れがひどい場合を(1)として5段階で
評価した。<Dirty magnetic head> The obtained 120-minute-long magnetic tape was observed for head dirt after running 100 times on a VTR, and when no dirt was observed (5), dirt was found. The evaluation was performed on a scale of 5 on the basis of (4) when slight stains were observed, (3) when stains were observed, (2) when stains were found to be slightly larger, and (1) when severe stains were observed.
【0031】<出力劣化>得られた磁気テ−プを、VT
Rで100回走行させた後の再生出力を測定し、初期出
力に対する出力低下値を測定した。下記表1はその結果
である。<Output Deterioration> The obtained magnetic tape is VT
The reproduction output after running 100 times at R was measured, and the output reduction value with respect to the initial output was measured. Table 1 below shows the results.
【0032】 [0032]
【0033】[0033]
【発明の効果】上記表1から明らかなように、この発明
で得られた磁気テ−プ(実施例1〜3)は、従来の磁気
テ−プ(比較例1〜2)に比し、スチル寿命が長く、ま
た磁気ヘッド汚れが少なくて、出力劣化が小さく、この
ことからこの発明で得られる磁気記録媒体は、電磁変換
特性が良好で走行耐久性に優れていることがわかる。As is apparent from Table 1 above, the magnetic tapes obtained in the present invention (Examples 1 to 3) are superior to the conventional magnetic tapes (Comparative Examples 1 to 2) in that The still life is long, the magnetic head is less contaminated, and the output is less deteriorated. From this, it is understood that the magnetic recording medium obtained by the present invention has good electromagnetic conversion characteristics and excellent running durability.
Claims (1)
潤滑剤と分子末端に極性基を有しない潤滑剤とからなる
潤滑剤層を設け、分子末端に極性基を有する潤滑剤を分
子末端に極性基を有しない潤滑剤より潤滑剤層の厚さ方
向で磁性層側より表面側に多くしたことを特徴とする磁
気記録媒体1. A lubricant layer comprising a lubricant having a polar group at the molecular end and a lubricant having no polar group at the molecular end is provided on the magnetic layer, and the lubricant having the polar group at the molecular end is added to the molecule. A magnetic recording medium characterized in that the amount of lubricant on the surface side is larger than that on the magnetic layer side in the thickness direction of the lubricant layer than the lubricant having no polar group at the end.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18587392A JPH064857A (en) | 1992-06-19 | 1992-06-19 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18587392A JPH064857A (en) | 1992-06-19 | 1992-06-19 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH064857A true JPH064857A (en) | 1994-01-14 |
Family
ID=16178375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18587392A Withdrawn JPH064857A (en) | 1992-06-19 | 1992-06-19 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH064857A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009123037A1 (en) * | 2008-03-30 | 2009-10-08 | Hoya株式会社 | Magnetic disc and method for manufacturing the same |
JP2009245492A (en) * | 2008-03-30 | 2009-10-22 | Hoya Corp | Magnetic disk and its manufacturing method |
US9123581B2 (en) | 2006-10-02 | 2015-09-01 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
-
1992
- 1992-06-19 JP JP18587392A patent/JPH064857A/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9123581B2 (en) | 2006-10-02 | 2015-09-01 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device |
WO2009123037A1 (en) * | 2008-03-30 | 2009-10-08 | Hoya株式会社 | Magnetic disc and method for manufacturing the same |
JP2009245492A (en) * | 2008-03-30 | 2009-10-22 | Hoya Corp | Magnetic disk and its manufacturing method |
US9005782B2 (en) | 2008-03-30 | 2015-04-14 | WD Media, LLC | Magnetic disk and method of manufacturing the same |
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A300 | Withdrawal of application because of no request for examination |
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