JPH06309650A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH06309650A JPH06309650A JP5096083A JP9608393A JPH06309650A JP H06309650 A JPH06309650 A JP H06309650A JP 5096083 A JP5096083 A JP 5096083A JP 9608393 A JP9608393 A JP 9608393A JP H06309650 A JPH06309650 A JP H06309650A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- weight
- parts
- recording medium
- protrusions
- 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
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は磁気記録媒体に関し、更
に詳しくは走行安定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, and more particularly to a magnetic recording medium excellent in running stability.
【０００２】[0002]
【従来の技術】近年、磁気記録媒体にあっては大容量
化、高密度記録化を図るため、強磁性金属粉等の材質面
での検討がなされると共に、磁性層の構造的な面から磁
気記録媒体の性能を向上させる試みが行なわれている。
その一例として、磁性層の表面状態を出来るだけ滑らか
にして磁気記録媒体と磁気ヘッドとのスペーシングを少
なくすることが挙げられる。2. Description of the Related Art In recent years, in order to increase the capacity and density of magnetic recording media, studies have been conducted on the material of ferromagnetic metal powder and the like, and from the structural aspect of the magnetic layer. Attempts have been made to improve the performance of magnetic recording media.
An example thereof is to make the surface state of the magnetic layer as smooth as possible to reduce the spacing between the magnetic recording medium and the magnetic head.
【０００３】磁気記録媒体のうち、いわゆる塗布型の磁
気記録媒体は、磁性粉、結合剤、潤滑剤、分散剤、研磨
剤等からなる磁性塗料を基材に塗布して磁性層が製造さ
れるが、磁性層の表面状態は磁性塗料を構成する成分に
大きく左右される。磁性層の表面状態を示す指標として
中心線表面粗さ（Ra）があり、この値が小さいほど表面
の凹凸が少なく磁性層の表面状態は滑らかであるといえ
る。Among so-called coating type magnetic recording media among the magnetic recording media, a magnetic layer is manufactured by coating a base material with a magnetic paint comprising a magnetic powder, a binder, a lubricant, a dispersant, an abrasive and the like. However, the surface condition of the magnetic layer is greatly influenced by the components that make up the magnetic paint. There is a center line surface roughness (Ra) as an index showing the surface condition of the magnetic layer, and it can be said that the smaller this value is, the less the surface irregularities are and the smoother the surface condition of the magnetic layer is.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、磁性層
表面のRaの値が小さくなるにつれて磁気ヘッドと磁気記
録媒体表面との接触面積が増加し、見かけの摩擦係数が
大きくなり、走行安定性が低下するという問題があっ
た。従って、本発明の目的は磁性層表面のRa値を小さく
した場合の摩擦係数の増加に伴う走行安定性の低下とい
う問題を解決し、信頼性の高い磁気記録媒体を提供する
ことにある。However, as the value of Ra on the surface of the magnetic layer decreases, the contact area between the magnetic head and the surface of the magnetic recording medium increases, the apparent coefficient of friction increases, and the running stability decreases. There was a problem of doing. Therefore, an object of the present invention is to solve the problem that the running stability is lowered due to the increase of the friction coefficient when the Ra value of the magnetic layer surface is made small, and to provide a highly reliable magnetic recording medium.
【０００５】[0005]
【課題を解決するための手段】本発明者らは上記の目的
を達成するために鋭意研究した結果、本発明を完成する
に至った。Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, completed the present invention.
【０００６】即ち本発明は、表面に多数の微細な突起を
有する磁性層がベースフィルム上に形成されている磁気
記録媒体において、前記磁性層が潤滑剤を磁性粉100 重
量部に対して８〜30重量部含有し、且つ前記磁性層の最
も高い突起の頂点から垂直方向下方20nmに位置しベース
フィルムに平行な水平面よりも高い突起の数が 400〜25
00個／mm2 であることを特徴とする磁気記録媒体を提供
するものである。That is, according to the present invention, in a magnetic recording medium in which a magnetic layer having a large number of fine protrusions on the surface is formed on a base film, the magnetic layer contains a lubricant in an amount of 8 to 100 parts by weight of magnetic powder. The number of protrusions is 30 to 30 parts by weight, and the number of protrusions located 20 nm vertically below the highest protrusion of the magnetic layer and higher than the horizontal plane parallel to the base film is 400 to 25.
The present invention provides a magnetic recording medium characterized by being 00 / mm 2 .
【０００７】本発明の磁気記録媒体は、潤滑剤が磁性粉
に対して特定量配合され、且つ磁性層が特定の表面状態
を有することを特徴とするものである。以下本発明の磁
気記録媒体の磁性層の状態について、図面に基づき説明
する。The magnetic recording medium of the present invention is characterized in that a lubricant is blended with a magnetic powder in a specific amount and the magnetic layer has a specific surface condition. The state of the magnetic layer of the magnetic recording medium of the present invention will be described below with reference to the drawings.
【０００８】図１は本発明の磁気記録媒体の断面略示図
であり、磁性層の形態を模式的に示すものである。図
中、１は基材、２は磁性層、３は最も高い突起、４は突
起３の頂点から垂直方向20nmに位置しベースフィルムに
平行な水平面、５は水平面４から突出している突起を表
す。本発明の磁気記録媒体の磁性層の表面は微視的には
多数の突起が形成されており、水平面４から突出してい
る突起５の数の合計Ｎが 400〜2500個／mm2 、好ましく
は 700〜1500個／mm2 であることを特徴とするものであ
る。Ｎは３次元光学式非接触表面粗さ計等により測定さ
れる。またここでいう「最も高い」とは相対的なもので
あり、磁性層の所望の範囲内で最も高い突起を意味す
る。FIG. 1 is a schematic sectional view of a magnetic recording medium of the present invention, schematically showing the form of a magnetic layer. In the figure, 1 is a substrate, 2 is a magnetic layer, 3 is the highest protrusion, 4 is a horizontal plane that is located at a vertical direction of 20 nm from the apex of the protrusion 3 and is parallel to the base film, and 5 is a protrusion protruding from the horizontal plane 4. . Microscopically, a large number of protrusions are formed on the surface of the magnetic layer of the magnetic recording medium of the present invention, and the total number N of the protrusions 5 protruding from the horizontal surface 4 is 400 to 2500 / mm 2 , preferably It is characterized in that it is 700 to 1500 pieces / mm 2 . N is measured by a three-dimensional optical non-contact surface roughness meter or the like. The "highest" here is relative and means the highest protrusion in the desired range of the magnetic layer.
【０００９】本発明の磁気記録媒体は、磁性粉100 重量
部に対して潤滑剤を８〜30重量部、好ましくは10〜15重
量部混入させた磁性塗料を、ベースフィルム上に塗布
し、乾燥し、研磨条件を調節することにより得ることが
できる。本発明の磁気記録媒体を得るための研磨条件と
しては、例えば＃8000〜＃10000 の研磨テープを用い
て、荷重を100 〜2000ｇｆ／cm2 として、回転数3000rp
m で２〜10秒間研磨する方法が挙げられる。また、カレ
ンダリング条件、研磨剤の量及びその粒径を最適化する
ことによっても本発明で規定する表面状態を有する磁気
記録媒体を得ることができる。In the magnetic recording medium of the present invention, a magnetic paint containing 8 to 30 parts by weight, preferably 10 to 15 parts by weight of a lubricant, is applied to 100 parts by weight of magnetic powder on a base film and dried. However, it can be obtained by adjusting the polishing conditions. The polishing conditions for obtaining the magnetic recording medium of the present invention are, for example, using # 8000 to # 10000 polishing tape, a load of 100 to 2000 gf / cm 2 , and a rotation speed of 3000 rp.
A method of polishing with m 2 for 2 to 10 seconds can be mentioned. Further, by optimizing the calendering conditions, the amount of the abrasive and the particle size thereof, the magnetic recording medium having the surface condition defined in the present invention can be obtained.
【００１０】本発明の磁気記録媒体に用いられる基材と
しては、合成樹脂（例えばポリエチレンテレフタレート
等のポリエステル、ポリアミド、ポリオレフィン、セル
ロース系誘導体）、非磁性の金属、ガラス、セラミッ
ク、紙等が挙げられ、その形態は、フィルム、テープ、
シート、カード、ディスク等で使用される。これらの基
材の厚さは１〜300 μm 程度である。Examples of the substrate used in the magnetic recording medium of the present invention include synthetic resins (for example, polyesters such as polyethylene terephthalate, polyamides, polyolefins, cellulosics), non-magnetic metals, glass, ceramics and paper. , Its form is film, tape,
Used in sheets, cards, discs, etc. The thickness of these substrates is about 1 to 300 μm.
【００１１】本発明の磁気記録媒体に用いられる磁性粉
としては、γ−Fe2O3 粉末、Fe3O4粉末、Co含有γ−Fe2
O3 粉末、Co含有Fe3O4 粉末、CrO2粉末、Fe粉末、Co粉
末、Fe−Ni粉末、バリウムフェライト粉末等、従来公知
の各種磁性粉末が広く使用できる。磁性層の厚さは特に
限定しないが、0.3 〜５μm 程度である。また、磁性層
の表面形状は微細な突起が多数形成されているが、突起
の高さは前記した本発明の規定を満たし、磁気記録媒体
としての性能を損なわないものであれば限定されない。The magnetic powder used in the magnetic recording medium of the present invention includes γ-Fe 2 O 3 powder, Fe 3 O 4 powder and Co-containing γ-Fe 2
Various conventionally known magnetic powders such as O 3 powder, Co-containing Fe 3 O 4 powder, CrO 2 powder, Fe powder, Co powder, Fe-Ni powder, and barium ferrite powder can be widely used. The thickness of the magnetic layer is not particularly limited, but is about 0.3 to 5 μm. Further, the surface shape of the magnetic layer is formed with a large number of fine protrusions, but the height of the protrusions is not limited as long as it satisfies the above-mentioned regulations of the present invention and does not impair the performance as a magnetic recording medium.
【００１２】本発明の磁気記録媒体に用いられる潤滑剤
は、磁気ヘッドと磁気記録媒体との接触走行時に潤滑作
用を示す材料をいい、具体的には各種のポリシロキサン
等のシリコーンオイル、グラファイト、二硫化モリブデ
ン等の無機粉末、ポリエチレン、ポリテトラフルオロエ
チレン等のプラスチック微粉末、高級脂肪酸、高級アル
コール、２−デシルテトラデシルオレエート、トリデシ
ルステアレート等の高級脂肪酸エステル、フルオロカー
ボン類などが挙げられる。これらの潤滑剤は磁性粉100
重量部に対して８〜30重量部、好ましくは10〜15重量部
の範囲で配合される。The lubricant used in the magnetic recording medium of the present invention is a material exhibiting a lubricating action when the magnetic head and the magnetic recording medium are in contact with each other. Specifically, silicone oil such as various polysiloxanes, graphite, Inorganic powders such as molybdenum disulfide, plastic fine powders such as polyethylene and polytetrafluoroethylene, higher fatty acids, higher alcohols, higher fatty acid esters such as 2-decyltetradecyl oleate and tridecyl stearate, fluorocarbons and the like. . These lubricants are magnetic powder 100
It is blended in an amount of 8 to 30 parts by weight, preferably 10 to 15 parts by weight, based on parts by weight.
【００１３】本発明の磁気記録媒体に用いられる結合剤
としては、ウレタン樹脂、特に SO3Na基等の極性基を含
有するポリウレタン樹脂、塩化ビニル−酢酸ビニル共重
合体、塩化ビニル−塩化ビニリデン共重合体、塩化ビニ
ル−アクリロニトリル共重合体等の塩化ビニル系共重合
体であって、特に SO3Na基等の極性基を含有する塩化ビ
ニル共重合体、ブタジエン−アクリロニトリル共重合
体、ポリアミド樹脂、ポリビニルブチラール、セルロー
ス誘導体（セルロースアセテートブチレート、セルロー
スプロピオネート、ニトロセルロース等）、スチレン−
ブタジエン共重合体、ポリエステル樹脂、各種の合成ゴ
ム系、フェノール樹脂、エポキシ樹脂、尿素樹脂、メラ
ミン樹脂、フェノキシ樹脂、シリコン樹脂、アクリル系
反応樹脂、高分子量ポリエステル樹脂とイソシアネート
プレポリマーの混合物、ポリエステルポリオールとポリ
イソシアネートの混合物、尿素ホルムアルデヒド樹脂、
低分子量グリコール／高分子量ジオール／イソシアネー
トの混合物、及びこれらの混合物等が例示される。Examples of the binder used in the magnetic recording medium of the present invention include urethane resins, particularly polyurethane resins containing polar groups such as SO 3 Na groups, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers. Polymers, vinyl chloride-copolymers such as vinyl chloride-acrylonitrile copolymers, especially vinyl chloride copolymers containing polar groups such as SO 3 Na groups, butadiene-acrylonitrile copolymers, polyamide resins, Polyvinyl butyral, cellulose derivatives (cellulose acetate butyrate, cellulose propionate, nitrocellulose, etc.), styrene-
Butadiene copolymer, polyester resin, various synthetic rubber, phenol resin, epoxy resin, urea resin, melamine resin, phenoxy resin, silicone resin, acrylic reaction resin, mixture of high molecular weight polyester resin and isocyanate prepolymer, polyester polyol And polyisocyanate mixture, urea formaldehyde resin,
Examples include a mixture of low molecular weight glycol / high molecular weight diol / isocyanate, and a mixture thereof.
【００１４】また磁性塗料の調製に用いられる有機溶媒
としては、シクロヘキサノン、メチルエチルケトン、メ
チルイソブチルケトン、酢酸エチル、ベンゼン、トルエ
ン、キシレン、ジメチルスルホキシド、テトラヒドロフ
ラン、ジオキサン等、使用する結合剤樹脂を溶解するの
に適した溶剤が特に制限されることなく単独又は二種以
上混合して使用される。As the organic solvent used for preparing the magnetic paint, the binder resin used, such as cyclohexanone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, benzene, toluene, xylene, dimethyl sulfoxide, tetrahydrofuran, dioxane, etc., is dissolved. The solvent suitable for is not particularly limited and may be used alone or as a mixture of two or more kinds.
【００１５】なお、磁性塗料中には通常使用されている
各種添加剤、例えば硬化剤、分散剤、研磨剤などを適宜
に添加使用してもよい。本発明で用いることができる分
散剤としては、レシチン、ノニオン系界面活性剤、アニ
オン系界面活性剤、カチオン系界面活性剤等が使用され
る。研磨剤としては、α−アルミナ、溶融アルミナ、炭
化ケイ素、酸化クロム(Cr2O3) 、コランダム、ダイヤモ
ンド等の平均粒子径0.05〜0.5 μm の微粉末が使用さ
れ、バインダー100 重量部に対し0.5 〜100 重量部加え
られる。Incidentally, various additives which are usually used, such as a curing agent, a dispersant and an abrasive, may be appropriately added to the magnetic paint. As the dispersant that can be used in the present invention, lecithin, nonionic surfactants, anionic surfactants, cationic surfactants and the like are used. As the polishing agent, fine powder having an average particle size of 0.05 to 0.5 μm such as α-alumina, fused alumina, silicon carbide, chromium oxide (Cr 2 O 3 ), corundum, and diamond is used, and it is 0.5 per 100 parts by weight of the binder. ~ 100 parts by weight added.
【００１６】[0016]
【発明の効果】本発明の磁気記録媒体によれば、磁気ヘ
ッドと磁気記録媒体の見掛けの摩擦係数を小さく抑える
ことができる。そのため、磁気記録媒体の走行安定性、
耐久性の向上が可能となり、動作信頼性の高い磁気記録
媒体が提供される。According to the magnetic recording medium of the present invention, the apparent friction coefficient between the magnetic head and the magnetic recording medium can be suppressed small. Therefore, the running stability of the magnetic recording medium,
A magnetic recording medium having improved durability and high operation reliability is provided.
【００１７】[0017]
【実施例】以下実施例にて本発明を説明するが、本発明
はこれらの実施例に限定されるものではない。EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
【００１８】実施例１ ・バリウムフェライト強磁性粉（板状比３）１００重量部 ・ＶＡＧＨ ７重量部 （ＵＣＣ社製の塩化ビニル−酢酸ビニル−ビニルアルコール共重合体） ・Ｎ２３０１ ７重量部 （日本ポリウレタン工業 (株) 製のポリウレタン樹脂） ・アルミナ １０重量部 ・カーボンブラック ４重量部 ・２−デシルテトラデシルオレエート ７重量部 ・トリデシルステアレート ７重量部 上記成分を充分に混練した後、これにコロネートＬ（日
本ポリウレタン工業 (株) 製のポリイソシアネート）を
４重量部（磁性粉１００重量部に対して）添加して磁性
塗料を作製し、この磁性塗料をポリエチレンテレフタレ
ートフィルム（厚さ75μm ）上に塗布し、乾燥及びカレ
ンダー処理を行なう。その後、直径86mmのディスク状に
打抜き、＃8000の研磨テープ（日本ミクロコーティング
(株) 製）を用い、 700ｇｆ／cm2 の荷重をかけて、30
00rpm で３秒間にわたって研磨し、磁気ディスクを得
た。Example 1 100 parts by weight of barium ferrite ferromagnetic powder (plate ratio 3) 7 parts by weight of VAGH (vinyl chloride-vinyl acetate-vinyl alcohol copolymer manufactured by UCC) 7230 parts by weight of N2301 (Japan Polyurethane resin manufactured by Polyurethane Industry Co., Ltd.) Alumina 10 parts by weight Carbon black 4 parts by weight 2-decyl tetradecyl oleate 7 parts by weight Tridecyl stearate 7 parts by weight After sufficiently mixing the above components, this To 4 parts by weight of Coronate L (polyisocyanate manufactured by Nippon Polyurethane Industry Co., Ltd.) was added (to 100 parts by weight of magnetic powder) to prepare a magnetic paint, and this magnetic paint was made into a polyethylene terephthalate film (thickness: 75 μm). Apply on top, dry and calender. After that, punched out into a disk with a diameter of 86 mm and polishing tape # 8000 (Nippon Micro Coating
(Manufactured by Co., Ltd.) with a load of 700 gf / cm 2
Polishing was performed at 00 rpm for 3 seconds to obtain a magnetic disk.
【００１９】実施例２ 実施例１における研磨工程を、＃10000 の研磨テープ
（日本ミクロコーティング (株) 製）を用い、1000ｇｆ
／cm2 の荷重をかけて、3000rpm で２秒間にわたって研
磨して行い、その他は実施例１と同様にして磁気ディス
クを得た。Example 2 The polishing step in Example 1 was carried out using a # 10000 polishing tape (manufactured by Nippon Micro Coating Co., Ltd.) at 1000 gf.
A magnetic disk was obtained in the same manner as in Example 1 except that the polishing was performed by applying a load of / cm 2 for 2 seconds at 3000 rpm.
【００２０】実施例３ 実施例１における研磨工程を、＃10000 の研磨テープ
（日本ミクロコーティング (株) 製）を用い、400 ｇｆ
／cm2 の荷重をかけて、3000rpm で２秒間にわたって研
磨して行い、その他は実施例１と同様にして磁気ディス
クを得た。Example 3 The polishing step in Example 1 was repeated with 400 gf of # 10000 polishing tape (manufactured by Nippon Micro Coating Co., Ltd.).
A magnetic disk was obtained in the same manner as in Example 1 except that the polishing was performed by applying a load of / cm 2 for 2 seconds at 3000 rpm.
【００２１】実施例４ 実施例１における研磨工程を、＃8000の研磨テープ（日
本ミクロコーティング(株) 製）を用い、1400ｇｆ／cm
2 の荷重をかけて、3000rpm で３秒間にわたって研磨し
て行い、その他は実施例１と同様にして磁気ディスクを
得た。Example 4 The polishing step in Example 1 was carried out using a # 8000 polishing tape (manufactured by Nippon Micro Coating Co., Ltd.) at 1400 gf / cm.
A magnetic disk was obtained in the same manner as in Example 1 except that a load of 2 was applied and polishing was performed at 3000 rpm for 3 seconds.
【００２２】実施例５ 実施例１の磁性塗料の配合中、２−デシルテトラデシル
オレエートの配合量を４重量部、トリデシルステアレー
トの配合量を４重量部とし、実施例１における研磨工程
を、＃8000の研磨テープ（日本ミクロコーティング
(株) 製）を用い、700 ｇｆ／cm2 の荷重をかけて、300
0rpm で３秒間にわたって研磨して行い、その他は実施
例１と同様にして磁気ディスクを得た。Example 5 In the composition of the magnetic paint of Example 1, the amount of 2-decyltetradecyl oleate was 4 parts by weight and the amount of tridecyl stearate was 4 parts by weight, and the polishing step in Example 1 was carried out. # 8000 polishing tape (Japan Micro Coating
(Manufactured by Co., Ltd.) with a load of 700 gf / cm 2
A magnetic disk was obtained in the same manner as in Example 1 except that polishing was performed at 0 rpm for 3 seconds.
【００２３】実施例６ 実施例１の磁性塗料の配合中、２−デシルテトラデシル
オレエートの配合量を15重量部、トリデシルステアレー
トの配合量を15重量部とし、実施例１における研磨工程
を、＃8000の研磨テープ（日本ミクロコーティング
(株) 製）を用い、700 ｇｆ／cm2 の荷重をかけて、300
0rpm で３秒間にわたって研磨して行い、その他は実施
例１と同様にして磁気ディスクを得た。Example 6 In the composition of the magnetic paint of Example 1, the amount of 2-decyltetradecyl oleate was 15 parts by weight and the amount of tridecyl stearate was 15 parts by weight. # 8000 polishing tape (Japan Micro Coating
(Manufactured by Co., Ltd.) with a load of 700 gf / cm 2
A magnetic disk was obtained in the same manner as in Example 1 except that polishing was performed at 0 rpm for 3 seconds.
【００２４】比較例１ 実施例１における研磨工程を、＃10000 の研磨テープ
（日本ミクロコーティング (株) 製）を用い、50ｇｆ／
cm2 の荷重をかけて、3000rpm で１秒間にわたって研磨
して行い、その他は実施例１と同様にして磁気ディスク
を得た。Comparative Example 1 The polishing step in Example 1 was carried out using a # 10000 polishing tape (manufactured by Nippon Micro Coating Co., Ltd.) at 50 gf /
A magnetic disk was obtained in the same manner as in Example 1 except that a load of cm 2 was applied and polishing was performed at 3000 rpm for 1 second.
【００２５】比較例２ 実施例１における研磨工程を、＃6000の研磨テープ（日
本ミクロコーティング(株) 製）を用い、4000ｇｆ／cm
2 の荷重をかけて、3000rpm で４秒間にわたって研磨し
て行い、その他は実施例１と同様にして磁気ディスクを
得た。Comparative Example 2 The polishing step in Example 1 was carried out using a # 6000 polishing tape (manufactured by Nippon Micro Coating Co., Ltd.) at 4000 gf / cm.
A magnetic disk was obtained in the same manner as in Example 1 except that a load of 2 was applied and polishing was performed at 3000 rpm for 4 seconds.
【００２６】比較例３ 実施例１の磁性塗料の配合中、２−デシルテトラデシル
オレエートの配合量を４重量部、トリデシルステアレー
トの配合量を３重量部とし、実施例１における研磨工程
を、＃8000の研磨テープ（日本ミクロコーティング
(株) 製）を用い、700 ｇｆ／cm2 の荷重をかけて、300
0rpm で３秒間にわたって研磨して行い、その他は実施
例１と同様にして磁気ディスクを得た。Comparative Example 3 In the magnetic coating composition of Example 1, the amount of 2-decyltetradecyl oleate was 4 parts by weight and the amount of tridecyl stearate was 3 parts by weight. # 8000 polishing tape (Japan Micro Coating
(Manufactured by Co., Ltd.) with a load of 700 gf / cm 2
A magnetic disk was obtained in the same manner as in Example 1 except that polishing was performed at 0 rpm for 3 seconds.
【００２７】比較例４ 実施例１の磁性塗料の配合中、２−デシルテトラデシル
オレエートの配合量を16重量部、トリデシルステアレー
トの配合量を15重量部とし、実施例１における研磨工程
を、＃8000の研磨テープ（日本ミクロコーティング
(株) 製）を用い、700 ｇｆ／cm2 の荷重をかけて、300
0rpm で３秒間にわたって研磨して行い、その他は実施
例１と同様にして磁気ディスクを得た。Comparative Example 4 In the magnetic coating composition of Example 1, the amount of 2-decyltetradecyl oleate was 16 parts by weight and the amount of tridecyl stearate was 15 parts by weight. # 8000 polishing tape (Japan Micro Coating
(Manufactured by Co., Ltd.) with a load of 700 gf / cm 2
A magnetic disk was obtained in the same manner as in Example 1 except that polishing was performed at 0 rpm for 3 seconds.
【００２８】＜特性評価＞上記各実施例及び比較例で得
た磁気ディスクについて、３次元光学式非接触表面粗さ
計（ZYGO社製）で0.16mm×0.18mmの範囲で表面形状を測
定した。中心線平均粗さ(Ra)、磁性層表面上の最も高い
頂点から垂直方向に20nmの深さで切断した時のその水平
面より高い突起の数Ｎ（個／mm2 ）、更に磁気ヘッドと
磁気ディスクの１時間走行後の摩擦係数、並びに温度及
び湿度を周期的に変化させたサイクル条件下における30
00万パス連続走行試験後の初期出力に対する出力（％）
を表１に示す。ここで、温度及び湿度の変化を示すグラ
フを図１に示す。また、摩擦係数の測定方法は以下の通
りである。<Characteristic Evaluation> With respect to the magnetic disks obtained in each of the above Examples and Comparative Examples, the surface shape was measured with a three-dimensional optical non-contact surface roughness meter (manufactured by ZYGO) within a range of 0.16 mm × 0.18 mm. . Center line average roughness (Ra), the number N (number / mm 2 ) of protrusions higher than the horizontal plane when cut at a depth of 20 nm from the highest apex on the surface of the magnetic layer, and the magnetic head and magnetic The friction coefficient of the disk after running for 1 hour, and the cyclic condition of temperature and humidity were changed.
Output (%) with respect to the initial output after the continuous running test of 0,000,000 paths
Is shown in Table 1. Here, a graph showing changes in temperature and humidity is shown in FIG. The method of measuring the friction coefficient is as follows.
【００２９】・摩擦係数測定方法 ドライブのモーターに値が既知のトルクを強制的に与
え、モーター負荷電流ＩとトルクＴの関係を調べる。こ
れにより、フレキシブルディスクの回転トルクが、モー
ター負荷電流の測定から求められる。ヘッドロード時の
上記トルクをＴon（ｇ・cm）、同じくヘッドアンロード
時のトルクをＴoff （ｇ・cm）とすると、ヘッドとディ
スク表面の摩擦（動摩擦係数をμｋとする）に起因する
トルクＴH/M （ｇ・cm）は、ＴH/M ＝Ｔon−Ｔoff で与
えられる。動摩擦係数μｋは、ＳＩＤＥ０とＳＩＤＥ１
の平均値として次式(1) で求める。 μｋ＝ＴH/M ／（２・rm・Ｍ） …(1) ここで、 rm はＳＩＤＥ０とＳＩＤＥ１のトラック半径
の平均値（cm）、Ｍはヘッド荷重（ｇ）である。測定環
境は23℃、50％RHとした。Friction coefficient measuring method The torque of a known value is forcibly applied to the drive motor, and the relationship between the motor load current I and the torque T is investigated. Thereby, the rotational torque of the flexible disk can be obtained by measuring the motor load current. When the above torque during head loading is T on (g · cm) and the torque during head unloading is T off (g · cm), it is caused by friction between the head and the disk surface (dynamic friction coefficient is μk). The torque T H / M (g · cm) is given by T H / M = T on −T off . The coefficient of dynamic friction μk is SIDE0 and SIDE1
The average value of is calculated by the following equation (1). μk = TH / M / (2 · r m · M) (1) Here, r m is the average value (cm) of the track radii of SIDE0 and SIDE1, and M is the head load (g). The measurement environment was 23 ° C. and 50% RH.
【００３０】[0030]
【表１】 [Table 1]
【００３１】注） ＊表中、潤滑剤の配合量は磁性粉100 重量部に対する重
量部である。Note) * In the table, the compounding amount of the lubricant is parts by weight based on 100 parts by weight of the magnetic powder.
【００３２】比較例１のように突起数が400 個／mm2 よ
りも少ない場合、磁気ディスク表面の少ない突起でヘッ
ド荷重を支えるため、突起に局部的な圧力が加わり、磁
気メディアが損傷しやすくなる。つまり比較例１のよう
に連続走行試験後の出力が低くなる。反対に比較例２の
ように突起数が2500個／mm2 よりも多い場合は、ヘッド
と磁気ディスクの真実接触面積が増加し、摩擦係数が増
加してしまうため、走行が不安定になる。また、突起数
が 400〜2500個／mm2 の範囲にあっても、潤滑剤の配合
量が磁性粉100 重量部に対して８重量部未満の場合は、
比較例３のように連続走行試験後の出力が低くなる。ま
た、比較例４のように潤滑剤の配合量が磁性粉100 重量
部に対して30重量部を越える場合も摩擦係数が増加して
しまい、連続走行試験後の出力が低くなる。When the number of protrusions is less than 400 / mm 2 as in Comparative Example 1, the head load is supported by the protrusions on the surface of the magnetic disk, so that local pressure is applied to the protrusions and the magnetic medium is easily damaged. Become. That is, the output after the continuous running test becomes low as in Comparative Example 1. On the contrary, when the number of protrusions is more than 2500 pieces / mm 2 as in Comparative Example 2, the actual contact area between the head and the magnetic disk increases and the friction coefficient increases, so that the running becomes unstable. Even if the number of protrusions is in the range of 400 to 2500 / mm 2 , if the compounding amount of the lubricant is less than 8 parts by weight with respect to 100 parts by weight of the magnetic powder,
The output after the continuous running test is low as in Comparative Example 3. Also, as in Comparative Example 4, when the amount of the lubricant compounded exceeds 30 parts by weight with respect to 100 parts by weight of the magnetic powder, the friction coefficient increases and the output after the continuous running test becomes low.
【００３３】これに対して、実施例１〜６のように、突
起数が 400〜2500個／mm2 の範囲にあり、且つ潤滑剤の
量が磁性粉100 重量部に対して８〜30重量部の範囲にあ
る場合は、摩擦係数は低く、連続走行試験後の出力も高
いことがわかる。特に突起数が 700〜1500個／mm2 の範
囲にあり、且つ潤滑剤の量が磁性粉100 重量部に対して
10〜15重量部の範囲にある実施例１及び２が好ましい結
果を示している。On the other hand, as in Examples 1 to 6, the number of protrusions is in the range of 400 to 2500 / mm 2 , and the amount of the lubricant is 8 to 30 parts by weight with respect to 100 parts by weight of the magnetic powder. It can be seen that the friction coefficient is low and the output after the continuous running test is high in the range of the part. In particular, the number of protrusions is in the range of 700 to 1500 / mm 2 , and the amount of lubricant is 100 parts by weight of magnetic powder.
Examples 1 and 2 in the range of 10 to 15 parts by weight show favorable results.
【００３４】以上の結果から、本発明の磁気ディスクは
走行安定性に優れ、記録再生特性に優れたものであるこ
とがわかる。From the above results, it can be seen that the magnetic disk of the present invention is excellent in running stability and recording / reproducing characteristics.
【図１】本発明の磁気記録媒体の断面略示図である。FIG. 1 is a schematic sectional view of a magnetic recording medium of the present invention.
【図２】実施例及び比較例において、連続走行試験を行
なう温度及び湿度の変化の周期を示す図である。FIG. 2 is a diagram showing cycles of changes in temperature and humidity for conducting a continuous running test in Examples and Comparative Examples.
１…基材 ２…磁性層 ３…突起 ４…水平面 ５…突起 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Magnetic layer 3 ... Protrusion 4 ... Horizontal surface 5 ... Protrusion
Claims (1)
がベースフィルム上に形成されている磁気記録媒体にお
いて、前記磁性層が潤滑剤を磁性粉100 重量部に対して
８〜30重量部含有し、且つ前記磁性層の最も高い突起の
頂点から垂直方向下方20nmに位置しベースフィルムに平
行な水平面よりも高い突起の数が 400〜2500個／mm2 で
あることを特徴とする磁気記録媒体。1. A magnetic recording medium comprising a base film and a magnetic layer having a large number of fine projections on the surface thereof, wherein the magnetic layer contains a lubricant in an amount of 8 to 30 parts by weight per 100 parts by weight of the magnetic powder. Magnetic recording characterized in that the number of protrusions contained and located 20 nm vertically below the highest protrusion of the magnetic layer and higher than the horizontal plane parallel to the base film is 400 to 2500 / mm 2. Medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5096083A JPH06309650A (en) | 1993-04-22 | 1993-04-22 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5096083A JPH06309650A (en) | 1993-04-22 | 1993-04-22 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06309650A true JPH06309650A (en) | 1994-11-04 |
Family
ID=14155507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5096083A Pending JPH06309650A (en) | 1993-04-22 | 1993-04-22 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06309650A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7169438B2 (en) | 2001-10-29 | 2007-01-30 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US7198817B2 (en) | 2002-11-18 | 2007-04-03 | Fuji Photo Film Co., Ltd. | Process for producing magnetic recording medium |
-
1993
- 1993-04-22 JP JP5096083A patent/JPH06309650A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7169438B2 (en) | 2001-10-29 | 2007-01-30 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US7344786B2 (en) | 2001-10-29 | 2008-03-18 | Fujifilm Corporation | Magnetic recording medium including a smooth coating layer on one side of the support |
| US7198817B2 (en) | 2002-11-18 | 2007-04-03 | Fuji Photo Film Co., Ltd. | Process for producing magnetic recording medium |
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