JPS59148131A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS59148131A JPS59148131A JP58021935A JP2193583A JPS59148131A JP S59148131 A JPS59148131 A JP S59148131A JP 58021935 A JP58021935 A JP 58021935A JP 2193583 A JP2193583 A JP 2193583A JP S59148131 A JPS59148131 A JP S59148131A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- lubricant
- recording medium
- magnetic layer
- acid ester
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/71—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the lubricant
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は磁気記録媒体に関し、その目的とするところ
は耐久性に優れた磁気記録媒体を提供することにある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording medium, and an object thereof is to provide a magnetic recording medium with excellent durability.
一般に、ポリエステルフィルムなどの基体上に磁性粉末
、結合剤樹脂、有機溶剤およびその他の必要成分からな
る磁性塗料を塗着してつくられる磁気記録媒体は、記録
再生時に磁気ヘッドおよびパッドなどと激しく摺接する
ため磁性層が摩耗され易く、磁性層の摩耗が少なくて耐
久性に優れたものが要求される。In general, magnetic recording media, which are made by coating a magnetic paint consisting of magnetic powder, binder resin, organic solvent, and other necessary components on a substrate such as a polyester film, are subject to intense rubbing against magnetic heads and pads during recording and playback. Since the magnetic layer is in contact with the magnetic layer, it is easily abraded, and a magnetic layer that is less abraded and has excellent durability is required.
このため、磁性層の耐摩耗性を改善する一方策として磁
性層中に種々の潤滑剤を混入することが行われており、
たとえばスクアランや流動パラフィンなどの炭化水素系
潤滑剤を磁性層中に混入したものが提案されている。For this reason, various lubricants are mixed into the magnetic layer as a way to improve the wear resistance of the magnetic layer.
For example, a magnetic layer in which a hydrocarbon lubricant such as squalane or liquid paraffin is mixed has been proposed.
ところが、この炭化水素系潤滑剤の混入によって耐摩耗
性はたしかに改善されるものの充分ではなく、特にこの
炭化水素系潤滑剤は磁気ディスク等の磁性層中に含有さ
せて使用すると、パッドが汚れる等の難点がある。However, although the abrasion resistance is certainly improved by incorporating this hydrocarbon lubricant, it is not sufficient, and in particular, when this hydrocarbon lubricant is used in the magnetic layer of a magnetic disk, etc., the pad becomes dirty, etc. There is a drawback.
この発明者らはかかる事情に鑑み種々検討を行なった結
果、不飽和脂肪酸エステルを炭化水素系潤滑剤と併用し
て磁性層中に含有させると、パッドが汚れたりすること
もなく、磁性層の耐摩耗性が充分に向上され、耐久性に
優れた磁気記録媒体が得られることを見いだし、この発
明をなすに至った。The inventors conducted various studies in view of the above circumstances and found that if an unsaturated fatty acid ester is contained in the magnetic layer in combination with a hydrocarbon lubricant, the pad will not become dirty and the magnetic layer will be It was discovered that a magnetic recording medium with sufficiently improved abrasion resistance and excellent durability could be obtained, and the present invention was completed.
この発明において使用される不飽和脂肪酸エステルは不
飽和二重結合を有するため揮発性が小さく、また優れた
潤滑能を有し、炭化水素系潤滑剤とともに併用するとな
じみもよく両者の潤滑機能が相乗的に作用して磁性層の
耐摩耗性が一段と向上され、その効果が長時間持続され
る。また両者の相乗作用によりこれらを磁気ディスクの
磁性層中に含有させると炭化水素系潤滑剤を単独で含有
させた場合の欠点も除去されてパッドが汚れたりするこ
ともなく、また不飽和脂肪酸エステルを単独で使用する
場合はヘッド圧が変化したり温度環境が変化した場合等
に耐久性にバラツキを生じるきらいがあるが、このよう
なバラツキもなくなり耐久性が改善される。このような
不飽和脂肪酸エステルとしては、オレイン酸エステル、
エライジン酸エステル、リノール酸エステル、リノール
酸エステルなどが好適なものとして使用され、具体例と
しては、たとえば、オレイン酸オレイル、オレイン酸−
n−ブチル等が挙げられる。The unsaturated fatty acid ester used in this invention has low volatility because it has an unsaturated double bond, and also has excellent lubrication ability, and when used in combination with a hydrocarbon-based lubricant, it is compatible and the lubrication function of both is synergistic. As a result, the wear resistance of the magnetic layer is further improved, and this effect is maintained for a long time. In addition, by incorporating these into the magnetic layer of the magnetic disk due to the synergistic effect of the two, the disadvantages of containing a hydrocarbon lubricant alone are eliminated, and the pad does not get dirty, and the unsaturated fatty acid ester When used alone, there is a tendency for variations in durability to occur when the head pressure changes or the temperature environment changes, but such variations are eliminated and durability is improved. Such unsaturated fatty acid esters include oleic acid ester,
Elaidic acid ester, linoleic acid ester, linoleic acid ester, etc. are preferably used, and specific examples include oleyl oleate, oleyl oleate, etc.
Examples include n-butyl.
併用される炭化水素系潤滑剤としては、たとえば、流動
パラフィン、スクアラン、スクアレン、合成スクアラン
、合成スクアレン、オレフィン重合油などの常温で液状
の液状炭化水素などが好適なものとして使用される。こ
の種の炭化水素系潤滑剤は優れた潤滑能を有し、不飽和
脂肪酸エステルと併用されると両者が相乗的に作用して
磁性層の耐摩耗性が一段と向上される。As the hydrocarbon lubricant used in combination, liquid hydrocarbons that are liquid at room temperature, such as liquid paraffin, squalane, squalene, synthetic squalane, synthetic squalene, and olefin polymerized oil, are preferably used. This type of hydrocarbon lubricant has excellent lubricating ability, and when used in combination with an unsaturated fatty acid ester, the two act synergistically to further improve the wear resistance of the magnetic layer.
このような炭化水素系潤滑剤に対する不飽和脂肪酸エス
テルの配合割合は重量比(炭化水素系潤滑剤対不飽和脂
肪酸エステル)で99対1〜1対99の範囲となるよう
にするのが好ましく、不飽和脂肪酸エステルの配合割合
が少なすぎるとパッドに対する磁性層の耐摩耗性が充分
に改善されず、炭化水素系潤滑剤の配合割合が少なすぎ
ると、特にヘッド圧が大きい場合にヘッドに対する磁性
層の耐摩耗性が充分に改善されない。またこのような配
合割合で配合した不飽和脂肪酸エステルと炭化水素系潤
滑剤の使用量は、両者合わせて磁性粉末に対して0.1
〜40重量%の範囲内にするのが好ましく、少なすぎる
と所期の効果が得られず、多すぎると磁性層表面にブリ
ードアウトして磁気ヘッドを汚染し、出力を低下させる
おそれがある。The blending ratio of the unsaturated fatty acid ester to such a hydrocarbon lubricant is preferably such that the weight ratio (hydrocarbon lubricant to unsaturated fatty acid ester) is in the range of 99:1 to 1:99. If the blending ratio of unsaturated fatty acid ester is too low, the wear resistance of the magnetic layer against the pad will not be sufficiently improved, and if the blending ratio of hydrocarbon lubricant is too low, the magnetic layer against the head will not improve sufficiently, especially when the head pressure is high. wear resistance is not sufficiently improved. In addition, the amount of unsaturated fatty acid ester and hydrocarbon lubricant blended in such a blending ratio is 0.1 in total based on the magnetic powder.
The amount is preferably in the range of ~40% by weight; if it is too small, the desired effect may not be obtained, and if it is too large, it may bleed out onto the surface of the magnetic layer, contaminating the magnetic head, and reducing the output.
不飽和脂肪酸エステルおよび炭化水素系潤滑剤を磁性層
中に含有させるには、これらをノルマルヘキサンなどの
適当な溶剤に熔解し、溶解によって得られた溶液を予め
形成した磁性層に塗布もしくは噴霧するか、或いは逆に
磁性層を上記溶液中に浸漬して行えばよく、またこれら
を磁性粉末および結合剤樹脂とともに混練して磁性層を
形成することによって含有させてもよい。In order to incorporate the unsaturated fatty acid ester and hydrocarbon lubricant into the magnetic layer, these are dissolved in a suitable solvent such as n-hexane, and the solution obtained by dissolution is applied or sprayed onto the previously formed magnetic layer. Alternatively, the magnetic layer may be immersed in the above solution, or the magnetic layer may be incorporated by kneading these together with a magnetic powder and a binder resin to form a magnetic layer.
次に、この発明の実施例について説明する。Next, embodiments of the invention will be described.
実施例I
CO含有rFe2O3磁性 270重量部粉末
VAGH(米国u、c、c、社製、塩 80〃化ビニル
−酢酸ビニル−ビニ
ルアルコール共重合体)
N1432J(日本ゼオン社製、15〃アクリロニトリ
ル−ブタジェ
ン共重合体)
コロネートL(日本ボリウレタ 10〃工業社製、三官
能性低分子量
イソシアネート化合物)
H3−500(旭カーボン社製 34〃カーボンブラツ
ク)
オレイン酸オレイル 19〃α−Fe20
3粉末 11〃メチルイソブチルケトン
420〃トルエン 420〃
この組成物をボールミル中で混合分散して磁性塗料を調
製し、この磁性塗料を厚さ75μのポリエステルフィル
ム両面に乾燥厚が3μとなるように塗布、乾燥して磁性
層を形成した。次いでこれをスクアラン60重量部、ノ
ルマルヘキサン1000重量部からなる含浸溶液に短時
間浸漬し、乾燥後円板状に打ち抜いて磁気ディスクをつ
くった。Example I CO-containing rFe2O3 magnetic 270 parts by weight Powder VAGH (manufactured by U.C., USA, salt 80 vinylide-vinyl acetate-vinyl alcohol copolymer) N1432J (manufactured by Nippon Zeon Co., Ltd., 15 acrylonitrile-butadiene) Copolymer) Coronate L (Nippon Boliureta 10〃manufactured by Kogyo Co., Ltd., trifunctional low molecular weight isocyanate compound) H3-500 (manufactured by Asahi Carbon Co., Ltd. 34〃Carbon Black) Oleyl oleate 19〃α-Fe20
3 Powder 11 Methyl isobutyl ketone
420〃Toluene 420〃
A magnetic paint was prepared by mixing and dispersing this composition in a ball mill, and this magnetic paint was applied to both sides of a 75 μm thick polyester film to a dry thickness of 3 μm, and dried to form a magnetic layer. Next, this was immersed for a short time in an impregnating solution consisting of 60 parts by weight of squalane and 1000 parts by weight of n-hexane, dried, and punched out into a disk shape to produce a magnetic disk.
実施例2
実施例1における含浸溶液の組成において、スクアラン
に代えて流動パラフィンを同量使用した以外は実施例1
と同様にして磁気ディスクをつくった。Example 2 Example 1 except that the same amount of liquid paraffin was used in place of squalane in the composition of the impregnating solution in Example 1.
I made a magnetic disk in the same way.
実施例3
実施例1における磁性塗料の組成において、オレイン酸
オレイルに代えてオレイン酸−n−ブチルを同量使用し
た以外は実施例1と同様にして磁気ディスクをつくった
。Example 3 A magnetic disk was produced in the same manner as in Example 1 except that the same amount of n-butyl oleate was used in place of oleyl oleate in the composition of the magnetic paint in Example 1.
実施例4
実施例1における磁性塗料の組成において、オレイン酸
オレイルを省き、含浸溶液の組成において、スクアラン
の使用量を60重量部から20重量部に変更し、さらに
オレイン酸オレイルを40重量部加えた以外は実施例1
と同様にして磁気ディスクをつくった。Example 4 In the composition of the magnetic paint in Example 1, oleyl oleate was omitted, and in the composition of the impregnating solution, the amount of squalane used was changed from 60 parts by weight to 20 parts by weight, and 40 parts by weight of oleyl oleate was added. Example 1 except that
I made a magnetic disk in the same way.
比較例1
実施例1における磁性塗料の組成において、オレイン酸
オレイルを省いた以外は実施例1と同様にして磁気ディ
スクをつくった。Comparative Example 1 A magnetic disk was produced in the same manner as in Example 1 except that oleyl oleate was omitted from the composition of the magnetic paint in Example 1.
比較例2
実施例1における含浸溶液の組成において、スクアラン
を省いた以外は実施例1と同様にして磁気ディスクをつ
くった。Comparative Example 2 A magnetic disk was produced in the same manner as in Example 1 except that squalane was omitted from the composition of the impregnating solution in Example 1.
各実施例および各比較例で得られた磁気ディスクについ
て耐久性を調べるため、各得られた磁気ディスクを10
枚づつ用意し、これらを汚れ防止用ジャケットに挿入し
て10台の記録再生装置に装填し、磁気ヘッドをパッド
圧25g/c+Itで接触させて周速10 m / s
ecで摺接させながら再生出力が初期出力の50%にな
るまでの走行時間を各記録再生装置毎に測定し、10台
の記録再生装置のうちで最短の走行時間と50時間以上
走行時間が得られた割合とを調べた。また、再生出方が
初期出力の50%になるときのパッド汚れを観察した。In order to examine the durability of the magnetic disks obtained in each example and each comparative example, each obtained magnetic disk was
Prepare one sheet at a time, insert them into a dirt prevention jacket, load them into 10 recording/reproducing devices, and bring them into contact with a magnetic head at a pad pressure of 25 g/c+It at a circumferential speed of 10 m/s.
We measured the running time for each recording/playback device until the playback output reached 50% of the initial output while in sliding contact with the EC, and determined the shortest running time and the running time of 50 hours or more among the 10 recording/playback devices. The obtained ratio was investigated. In addition, pad staining was observed when the reproduction output reached 50% of the initial output.
下表はその結果である。The table below shows the results.
上表から明らかなように、この発明で得られた磁気ディ
スク(実施例1〜4)は、いづれも従来の磁気ディスク
(比較例1および2)に比し、最0
短走行時間が長く、また50時間以上走行の割合が10
0%でバラツキもなくて、バンド汚れも認められず、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耐
久性に優れ、かつ信頼性が向上されていることがわかる
。As is clear from the above table, the magnetic disks obtained by the present invention (Examples 1 to 4) all have a longer minimum running time than the conventional magnetic disks (Comparative Examples 1 and 2). Also, the percentage of driving for more than 50 hours was 10.
There was no variation at 0%, and no band stains were observed, indicating that the magnetic recording medium obtained by the present invention has excellent durability and improved reliability.
特許出願人 日立マクセル株式会社 代理人 高岡−春Patent applicant: Hitachi Maxell, Ltd. Agent Takaoka-Haru
Claims (1)
れてなる磁性層を有する磁気記録媒体1. Magnetic recording medium having a magnetic layer containing an unsaturated fatty acid ester and a hydrocarbon lubricant
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58021935A JPS59148131A (en) | 1983-02-12 | 1983-02-12 | Magnetic recording medium |
US06/579,169 US4522885A (en) | 1983-02-12 | 1984-02-10 | Magnetic recording medium |
EP19840101406 EP0116923B1 (en) | 1983-02-12 | 1984-02-11 | Magnetic recording medium |
DE8484101406T DE3464977D1 (en) | 1983-02-12 | 1984-02-11 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58021935A JPS59148131A (en) | 1983-02-12 | 1983-02-12 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59148131A true JPS59148131A (en) | 1984-08-24 |
Family
ID=12068902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58021935A Pending JPS59148131A (en) | 1983-02-12 | 1983-02-12 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59148131A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253682A (en) * | 1985-04-30 | 1986-11-11 | Hitachi Maxell Ltd | Floppy disk |
-
1983
- 1983-02-12 JP JP58021935A patent/JPS59148131A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253682A (en) * | 1985-04-30 | 1986-11-11 | Hitachi Maxell Ltd | Floppy disk |
JPH0740425B2 (en) * | 1985-04-30 | 1995-05-01 | 日立マクセル株式会社 | Floppy disk |
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