JPH06203356A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH06203356A JPH06203356A JP36044992A JP36044992A JPH06203356A JP H06203356 A JPH06203356 A JP H06203356A JP 36044992 A JP36044992 A JP 36044992A JP 36044992 A JP36044992 A JP 36044992A JP H06203356 A JPH06203356 A JP H06203356A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic recording
- magnetic
- value
- powder
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 230000003746 surface roughness Effects 0.000 claims abstract description 11
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000012937 correction Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- 238000005498 polishing Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 238000003490 calendering Methods 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 239000006061 abrasive grain Substances 0.000 description 3
- 229910000423 chromium oxide Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- BARWIPMJPCRCTP-UHFFFAOYSA-N oleic acid oleyl ester Natural products CCCCCCCCC=CCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC BARWIPMJPCRCTP-UHFFFAOYSA-N 0.000 description 2
- BARWIPMJPCRCTP-CLFAGFIQSA-N oleyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC BARWIPMJPCRCTP-CLFAGFIQSA-N 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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、
さらに詳しくは、製品化収率の高い、エラー発生率の低
い、フロッピーデイスクに好適な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, the present invention relates to a magnetic recording medium which is suitable for a floppy disk and has a high product yield and a low error occurrence rate.
【０００２】[0002]
【従来の技術】高密度のフロッピーデイスクにおいて
は、一層の高密度化のため、特に、ヘッドタッチの安定
性と出力の安定性が要求される。このような要求に応え
るため、媒体表面を平滑にすることが提案されている
（例えば特開平４−１８２９２３号公報、特開平４−２
９８８１９号公報参照）。しかし、単に平滑化するだけ
では、所望の性能を達成することは困難であった。特
に、記録密度の高い記録を行う場合には、ビットあたり
の記録面積が小さくなるため、製品化収率が低下し、エ
ラー発生率が高くなる欠点がある。2. Description of the Related Art In a high density floppy disk, stability of head touch and output stability are particularly required for higher density. In order to meet such a demand, it has been proposed to make the surface of the medium smooth (for example, Japanese Patent Laid-Open Nos. 4-182923 and 4-2).
98819). However, it has been difficult to achieve the desired performance by simply smoothing. In particular, when recording is performed at a high recording density, there is a drawback that the recording area per bit becomes small, so that the production yield decreases and the error occurrence rate increases.
【０００３】[0003]
【発明が解決しようとする課題】そこで、本発明は、使
用時のエラー発生率の低い、すなわち高い信頼性を有
し、製品化収率の高い磁気記録媒体を提供することを目
的とする。SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a magnetic recording medium having a low error occurrence rate during use, that is, high reliability and a high production yield.
【０００４】[0004]
【課題を解決するための手段】本発明は、非磁性基体上
に強磁性粉末とバインダーとを含む磁性塗液を塗布して
なる磁性層を有する磁気記録媒体において、磁性層の中
心線平均粗さ（Ｒａ）が４．０〜１０．０ｎｍであり、
かつ表面粗さのピーク値の最高値（Ｐ）が５０ｎｍ以
下、バレイ値の最高値（Ｖ）が２０ｎｍ以上であること
を特徴とする磁気記録媒体を提供するものである。The present invention provides a magnetic recording medium having a magnetic layer formed by coating a magnetic coating liquid containing a ferromagnetic powder and a binder on a non-magnetic substrate. (Ra) is 4.0 to 10.0 nm,
Further, the present invention provides a magnetic recording medium characterized by having a maximum peak value (P) of surface roughness of 50 nm or less and a maximum valley value (V) of 20 nm or more.
【０００５】本発明の磁気記録媒体においては、磁性層
の表面粗さを、中心線平均粗さ（Ｒａ）、ピーク値の最
高値（Ｐ）およびバレイ値の最低値（Ｖ）を特定の範囲
にすることによって、ヘッドと媒体間の良好な摩擦特性
を得ることができる。その結果、長時間使用においても
摩擦係数の増加傾向が小さく、従って使用時の繰り返し
摩擦による塗膜表面の劣化が少ない、すなわちエラー発
生率の少ない信頼性の高い媒体を得ることができる。In the magnetic recording medium of the present invention, the surface roughness of the magnetic layer is defined by the center line average roughness (Ra), the maximum peak value (P) and the minimum valley value (V) within a specific range. By this, good friction characteristics between the head and the medium can be obtained. As a result, it is possible to obtain a highly reliable medium in which the tendency of increase in the friction coefficient is small even after long-term use, and therefore the deterioration of the coating film surface due to repeated friction during use is small, that is, the error occurrence rate is small.
【０００６】すなわち、本発明においては、磁性層の中
心線平均粗さ（Ｒａ）を４．０〜１０．０ｎｍとする。
Ｒａが４．０ｎｍ未満では媒体表面が平滑になりすぎ、
ヘッド、媒体間の摩擦係数が高く、ヘッドのスムースな
進行が妨げられ、ステックスリップ現象を起こしやすい
ので、モジュレーション不良、ヘッド鳴きなどによる媒
体検査時のエラー発生が多くなり、製品化収率を低下さ
せる。また、このような媒体は長時間使用における摩擦
係数の増加傾向が大きく、塗膜の疲労、劣化によるエラ
ー発生も多い。一方、Ｒａが１０．０ｎｍを超えると、
特に高密度記録の際には高周波記録（２ｆ）時の出力、
およびＳ／Ｎが低下するなど、電磁変換特性上好ましく
ない。That is, in the present invention, the center line average roughness (Ra) of the magnetic layer is set to 4.0 to 10.0 nm.
When Ra is less than 4.0 nm, the medium surface becomes too smooth,
The coefficient of friction between the head and the medium is high, the smooth progress of the head is hindered, and the stick-slip phenomenon is likely to occur.Therefore, errors in medium inspection due to poor modulation, head squealing, etc. increase, and the product yield decreases. Let Further, such a medium has a large tendency of increasing the coefficient of friction during long-term use, and often causes errors due to fatigue and deterioration of the coating film. On the other hand, when Ra exceeds 10.0 nm,
Especially during high-density recording, the output during high-frequency recording (2f),
And S / N decrease, which is not preferable in terms of electromagnetic conversion characteristics.
【０００７】また、磁性層の表面粗さのピーク値の最高
値（Ｐ）は５０ｎｍ以下であることを要する。Ｐ値が５
０ｎｍを超えると、特に、スペーシングロスによる２ｆ
出力の低下が大きくなり好ましくない。Ｐ値は好ましく
は１５〜４０ｎｍである。Further, the maximum value (P) of the peak value of the surface roughness of the magnetic layer needs to be 50 nm or less. P value is 5
Above 0 nm, especially 2f due to spacing loss
This is not preferable because the output is greatly reduced. The P value is preferably 15 to 40 nm.
【０００８】また、バレイ値の最低値（Ｖ）は２０ｎｍ
以上であることを要する。Ｖ値が２０ｎｍ未満では、特
にステイックスリップによるヘッド鳴きを起こしやす
く、好ましくない。この理由は明らかでないが、Ｖ値が
２０ｎｍ未満では低速での摩擦係数が特に大きくなるこ
とから、ヘッドと媒体との間に介在する空気層の作用が
関与していると推定される。The minimum value (V) of the valley value is 20 nm
It is necessary to be above. If the V value is less than 20 nm, head squealing is particularly likely to occur due to stick slip, which is not preferable. Although the reason for this is not clear, when the V value is less than 20 nm, the friction coefficient at a low speed becomes particularly large, and therefore it is presumed that the action of the air layer interposed between the head and the medium is involved.
【０００９】Ｒａ、Ｐ値およびＶ値が前記範囲にあれば
本発明の目的を達成できるが、Ｐ値はＶ値以下であるこ
とが好ましい。このとき、摩擦特性と出力、Ｓ／Ｎなど
の電磁変換特性の両者のバランスのとれたものが得られ
やすい。Although the object of the present invention can be achieved when Ra, P value and V value are within the above ranges, it is preferable that P value is V value or less. At this time, it is easy to obtain a well-balanced friction characteristic and output, and electromagnetic conversion characteristics such as S / N.
【００１０】本発明において、Ｒａ、Ｐ値およびＶ値
は、非接触表面粗さ計（ＵＳＡ、ＷＹＫＯ社製、ＴＯＰ
Ｏ−３Ｄ）により、対物レンズ倍率＝２０倍、測定面積
＝０．５ｍｍ×０．５ｍｍ＝０．２５ｍｍ2 で測定した
値である。Ｒａは中心線平均粗さ（ｎｍ）、Ｐ値は０．
５ｍｍ×０．５ｍｍ視野の中のピークの最高値（ｎ
ｍ）、Ｖ値は同じ視野中のバレイの最低値（ｎｍ）であ
り、それぞれ、平均表面からの高さまたは深さで表す。In the present invention, Ra, P value and V value are non-contact surface roughness tester (USA, WYKO, TOP
O-3D) is a value measured with an objective lens magnification = 20 times and a measurement area = 0.5 mm × 0.5 mm = 0.25 mm 2 . Ra is the center line average roughness (nm), and P value is 0.
Highest peak value (n of 5 mm x 0.5 mm)
m) and V value are the minimum value (nm) of the valley in the same visual field, and are represented by the height or depth from the average surface, respectively.
【００１１】本発明において特定する表面粗さを有する
磁気記録媒体は、強磁性粉末と架橋剤を含むバインダー
と所定粒径のフィラーとを含む磁性塗液を、非磁性基体
に塗布乾燥し、非磁性基体上に磁性層を形成させたの
ち、カレンダー処理を施すことにより、製造することが
できる。In the magnetic recording medium having the surface roughness specified in the present invention, a magnetic coating liquid containing a ferromagnetic powder, a binder containing a cross-linking agent, and a filler having a predetermined particle size is applied to a non-magnetic substrate and dried, It can be manufactured by forming a magnetic layer on a magnetic substrate and then subjecting it to calendering.
【００１２】フィラーとしては、平均粒径が０．１〜
１．５μｍであって、磁性層厚みの１．２倍以下の粒径
であることが必要で、無機系のフィラーとしては、アル
ミナ、炭化珪素、酸化クロム、酸化チタン、シリカ、α
−酸化鉄、ジルコン、ジルコニア、炭酸カルシウム、カ
オリン、カーボンブラック、グラファイトなどを挙げる
ことができる。有機系のフィラーとしては、シリコーン
樹脂粉末、架橋ポリスチレン樹脂粉末などを挙げること
ができる。これらのフィラーは、強磁性粉末に対して
０．０１〜１０重量％含ませる必要がある。また、バイ
ンダーの中には、イソシアナートなどの架橋剤をバイン
ダー全重量中、５〜４０％含有させることが好ましい。The filler has an average particle size of 0.1 to 0.1
The particle size is required to be 1.5 μm and 1.2 times or less the thickness of the magnetic layer. As the inorganic filler, alumina, silicon carbide, chromium oxide, titanium oxide, silica, α
-Iron oxide, zircon, zirconia, calcium carbonate, kaolin, carbon black, graphite and the like. Examples of organic fillers include silicone resin powder and crosslinked polystyrene resin powder. These fillers should be contained in 0.01 to 10% by weight with respect to the ferromagnetic powder. Further, it is preferable that the binder contains a crosslinking agent such as isocyanate in an amount of 5 to 40% based on the total weight of the binder.
【００１３】また、塗布、乾燥し、カレンダー処理した
磁気記録媒体に対し、表面研磨処理を施すことによって
も製造することができる。フロッピーデイスクの研磨の
場合は、７００〜４，０００ｒｐｍで回転する媒体に対
し、研磨テープを接触させ、背面から圧空ノズルでテー
プを押しあてることによって表面研磨を行う。研磨テー
プとしては、平均粒径０．５〜３μｍのアルミナ、炭化
珪素、酸化クロム、酸化鉄、ダイヤモンドなどの粉末を
バインダーとともにフィルム基体に塗布し、テープ状に
スリットしたものを用いる。研磨テープの表面粗さ、硬
さの選択と研磨時間との組合せにより、本発明において
特定する表面粗さを有する磁気記録媒体を得ることがで
きる。The magnetic recording medium which has been coated, dried and calendered can also be manufactured by subjecting it to a surface polishing treatment. In the case of polishing a floppy disk, a polishing tape is brought into contact with a medium rotating at 700 to 4,000 rpm, and the surface is polished by pressing the tape from the back side with a pressure air nozzle. As the polishing tape, used is a tape in which powder of alumina, silicon carbide, chromium oxide, iron oxide, diamond or the like having an average particle diameter of 0.5 to 3 μm is applied to a film base together with a binder and slit into a tape shape. A magnetic recording medium having the surface roughness specified in the present invention can be obtained by a combination of the selection of the surface roughness and hardness of the polishing tape and the polishing time.
【００１４】本発明において、強磁性粉末としては、γ
−酸化鉄、Ｃｏ変成γ−酸化鉄、酸化クロム、バリウム
フェライトなどの強磁性酸化物粉体、および金属鉄、Ｆ
ｅ−Ｃｏ−Ｃｒなどの合金などの金属系粉体を挙げるこ
とができる。特に、高密度記録を達成する観点から金属
鉄粉末、バリウムフェライト粉末が好ましく、なかで
も、比表面積にて３０ｍ2 ／ｇ以上のものが好ましい。In the present invention, as the ferromagnetic powder, γ
-Ferromagnetic oxide powders such as iron oxide, Co-modified γ-iron oxide, chromium oxide, barium ferrite, and metallic iron, F
Metallic powders such as alloys such as e-Co-Cr can be mentioned. In particular, metallic iron powder and barium ferrite powder are preferable from the viewpoint of achieving high-density recording, and among them, those having a specific surface area of 30 m 2 / g or more are preferable.
【００１５】強磁性粉末の粒径は、ノイズを下げ、Ｓ／
Ｎを向上させるためは、小さいほどよい。しかし、微粒
子になるほど磁性塗液の製造工程における分散が困難と
なり、磁性塗液の安定性も問題となる。強磁性粉末の好
ましい粒径は、長径にて、０．２〜０．４μｍである。
高密度記録用媒体においては、かかる強磁性粉末を、通
常、磁性層中６０〜８５重量％含有させる。The particle size of the ferromagnetic powder reduces noise, and S /
In order to improve N, the smaller the better. However, the finer the particles, the more difficult it becomes to disperse in the manufacturing process of the magnetic coating liquid, and the stability of the magnetic coating liquid becomes a problem. The preferred particle size of the ferromagnetic powder is 0.2 to 0.4 μm in major axis.
In a high density recording medium, such a ferromagnetic powder is usually contained in the magnetic layer in an amount of 60 to 85% by weight.
【００１６】本発明の高密度用磁気記録媒体は、表面が
適度に仕上がっているため、摩擦特性が優れているう
え、スペーシングロスの少ない平滑面であるため、記録
密度が２０ｋｂｐｉ以上のデイジタル記録用として好適
に使用できる。The high-density magnetic recording medium of the present invention has an appropriately finished surface, and thus has excellent friction characteristics and a smooth surface with little spacing loss, so that the recording density is 20 kbpi or more. It can be preferably used as an application.
【００１７】[0017]
【実施例】以下に実施例を挙げて本発明をさらに詳細に
説明する。なお、実施例において、各値および評価は下
記のように測定、または実施した。The present invention will be described in more detail with reference to the following examples. In addition, in the examples, each value and evaluation were measured or carried out as follows.
【００１８】摩擦係数 日本電気（株）製、３．５インチＦＤＤ、ＦＤ−１１３
５を用い、通常の３６０ｒｐｍの回転で、ヘッドアンロ
ード時のモーター電流と、トラック００、ヘッドロード
時のモーター電流とを測定し、両者の差から、メデイア
とヘッド間の摩擦に要する電流値を求めた。これをトル
ク換算し、次いで、摩擦係数（μｋ１）を算出した。な
お、測定は２５℃、５０〜６０％ＲＨで行い、ヘッドテ
ンションは２２ｇであった。μｋ１の大小を次のように
評価した。 ○：μｋ１≦０．２６ △：０．２７≦μｋ１≦０．３０ ×：μｋ１≧０．３１ Coefficient of friction 3.5 inch FDD, FD-113 manufactured by NEC Corporation
5, the motor current at the time of head unload and the motor current at the time of track 00 and head load were measured at a normal 360 rpm rotation, and the current value required for friction between the media and the head was determined from the difference between the two. I asked. This was converted into torque, and then the friction coefficient (μk1) was calculated. The measurement was performed at 25 ° C. and 50 to 60% RH, and the head tension was 22 g. The magnitude of μk1 was evaluated as follows. ◯: μk1 ≦ 0.26 Δ: 0.27 ≦ μk1 ≦ 0.30 ×: μk1 ≧ 0.31
【００１９】摩擦係数変化 前記μｋ１を測定後、トラック００にヘッドロードし
て、室温で７２時間連続走行させた後に、再度回転トル
クを測定し、摩擦係数（μｋ２）を算出し、μｋ１に対
するμｋ２の比をもって、摩擦係数変化率とし、次のよ
うに評価した。 ○：μｋ２／μｋ１＝１．００〜１．２０ △：μｋ２／μｋ１＝１．２１〜１．４０ ×：μｋ２／μｋ１＞１．４０ Change in Friction Coefficient After measuring μk1, head load was carried out on track 00, and after traveling continuously for 72 hours at room temperature, the rotational torque was measured again to calculate the friction coefficient (μk2). The ratio was used as the friction coefficient change rate and evaluated as follows. ◯: μk2 / μk1 = 1.00 to 1.20 Δ: μk2 / μk1 = 1.21 to 1.40 X: μk2 / μk1> 1.40
【００２０】エラーレート メタル粉体を用いた媒体の場合は、日本電気（株）製、
市販ＦＤＤ、ＦＤ−１３３５Ｃを、バリウムフェライト
粉体を用いた場合はソニー（株）製、市販ＦＤＤ、Ｆ４
０Ｗを用い、全トラック面にＤＢ６信号をベタ書きし、
リトライ０で信号を読み取った。１０枚の媒体につき繰
り返しリードテストを行い、エラーレートを算出した。In the case of a medium using the error rate metal powder, manufactured by NEC Corporation,
Commercially available FDD and FD-1335C, when barium ferrite powder is used, manufactured by Sony Corporation, commercially available FDD and F4
0W is used to write the DB6 signal in solid on all track surfaces,
The signal was read at retry 0. An error rate was calculated by repeatedly performing a read test on 10 media.
【００２１】実施例１ メタル粉末（比表面積４２ｍ2 ／ｇ）１００部、バイン
ダー（極性基を有する塩化ビニル−酢酸ビニル樹脂とポ
リウレタン樹脂、およびバインダー全量に対し、２５重
量％のポリイソシアナートからなる架橋剤）３０．８
部、アルミナ（平均粒径０．４μｍ）１５．４部、潤滑
剤（ブチルステアレートとオレイルオレートとの混合
物）３．０部、シクロヘキサン・トルエン混合溶剤４０
０部を、公知の方法で混合分散させて、磁性塗液を調製
し、これを厚さ６２μｍのポリエステルフィルムに乾
燥、カレンダー後の塗布厚さが２．５μｍになるよう
に、両面に塗布し、磁気記録媒体を得た。Example 1 100 parts of metal powder (specific surface area 42 m 2 / g), binder (vinyl chloride-vinyl acetate resin having polar group and polyurethane resin), and 25% by weight of polyisocyanate based on the total amount of binder. Crosslinking agent) 30.8
Parts, alumina (average particle size 0.4 μm) 15.4 parts, lubricant (mixture of butyl stearate and oleyl oleate) 3.0 parts, cyclohexane / toluene mixed solvent 40
0 part was mixed and dispersed by a known method to prepare a magnetic coating liquid, which was dried on a polyester film having a thickness of 62 μm and coated on both surfaces so that the coating thickness after calendering was 2.5 μm. A magnetic recording medium was obtained.
【００２２】得られた磁気記録媒体を３．５インチのフ
ロッピーデイスクの形状に打抜き、異常突起を日本ミク
ロコーテイング（株）製、研磨テープＷＡ１０，０００
（平均砥粒径０．５μｍのアルミナ粉を塗設したテー
プ）を用いて、ソフトバーニッシュして表面仕上げを施
し、１０ＭＢのフロッピーデイスクとしての評価を表１
に示す項目について実施した。結果を表１に示す。The obtained magnetic recording medium was punched into a 3.5-inch floppy disk shape, and abnormal protrusions were produced by Nippon Micro Coating Co., Ltd., polishing tape WA10,000.
Using a (tape coated with alumina powder having an average abrasive grain size of 0.5 μm), a soft burnishing process is applied for surface finishing, and the evaluation as a 10 MB floppy disk is shown in Table 1.
It carried out about the item shown in. The results are shown in Table 1.
【００２３】実施例２〜３ 実施例１と同様にして磁性層を形成させるに際し、乾燥
条件（乾燥塗膜中の溶剤残量と架橋度のコントロール）
とカレンダー条件（塗膜の圧縮度のコントロール）を制
御して表１に示す表面粗さを有する磁気記録媒体を得、
実施例１と同様にして１０ＭＢのフロッピーデイスクを
得た。評価結果を表１に示す。Examples 2 to 3 In forming a magnetic layer in the same manner as in Example 1, drying conditions (control of residual amount of solvent and degree of crosslinking in dried coating film)
And calender conditions (control of the degree of compression of the coating film) were controlled to obtain a magnetic recording medium having the surface roughness shown in Table 1,
A 10 MB floppy disk was obtained in the same manner as in Example 1. The evaluation results are shown in Table 1.
【００２４】実施例４ 実施例３と同様にして磁性層を形成させるに際し、研磨
テープとして、日本ミクロコーテイング（株）製、ＷＡ
６０００（平均砥粒径２μｍのアルミナ粉を塗設したテ
ープ）を用いて、より強研磨条件に制御して１０ＭＢの
フロッピーデイスクを得た。評価結果を表１に示す。Example 4 When forming a magnetic layer in the same manner as in Example 3, as a polishing tape, WA manufactured by Nippon Micro Coating Co., Ltd. was used.
Using 6000 (tape coated with alumina powder having an average abrasive grain size of 2 μm), the polishing conditions were controlled to be stronger and a floppy disk of 10 MB was obtained. The evaluation results are shown in Table 1.
【００２５】比較例１〜２ 実施例１と同様にして磁性層を形成させるに際し、乾燥
条件とカレンダー条件を制御して表１に示す表面粗さを
有する磁気記録媒体を得、実施例１と同様にして１０Ｍ
Ｂのフロッピーデイスクを得た。評価結果を表１に示
す。Comparative Examples 1 and 2 When forming a magnetic layer in the same manner as in Example 1, a drying condition and a calender condition were controlled to obtain a magnetic recording medium having a surface roughness shown in Table 1, and Similarly 10M
I got B's floppy disk. The evaluation results are shown in Table 1.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【発明の効果】本発明によれば、製品化収率が高く、使
用時のエラー発生率の低い高密度用磁気記録媒体を提供
することができる。According to the present invention, it is possible to provide a high density magnetic recording medium having a high product yield and a low error occurrence rate during use.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年２月１８日[Submission date] February 18, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１６[Correction target item name] 0016
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１６】本発明の高密度用磁気記録媒体は、表面が
適度に仕上がっているので、摩擦特性が優れているう
え、スペーシングロスの少ない平滑面であるため、記録
密度が２０ｋｂｐｉ以上のデイジタル記録用として好適
に使用できる。The high-density magnetic recording medium of the present invention has an appropriately finished surface, and therefore has excellent friction characteristics and is a smooth surface with little spacing loss. It can be preferably used as an application.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１８[Correction target item name] 0018
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１８】摩擦係数 日本電気（株）製、３．５インチＦＤＤ、ＦＤ−１１３
５を用い、通常の３６０ｒｐｍの回転で、ヘッドアンロ
ード時のモーター電流と、トラック００、ヘッドロード
時のモーター電流とを測定し、両者の差から、メデイア
とヘッド間の摩擦に要する電流値を求めた。これをトル
ク換算し、次いで、摩擦係数（μｋ１）を算出した。な
お、測定は２５℃、５０〜６０％ＲＨで行い、ヘッドテ
ンションは２２ｇであった。μｋ１の大小を次のように
評価した。 ○：μｋ１≦０．２６ △：０．２７≦μｋ１≦０．３０ ×：μｋ１≧０．３１ Coefficient of friction 3.5 inch FDD, FD-113 manufactured by NEC Corporation
5, the motor current at the time of head unload and the motor current at the time of track 00 and head load were measured at a normal 360 rpm rotation, and the current value required for friction between the media and the head was determined from the difference between the two. I asked. This was converted into torque, and then the friction coefficient (μ k1 ) was calculated. The measurement was performed at 25 ° C. and 50 to 60% RH, and the head tension was 22 g. The magnitude of μ k1 was evaluated as follows. ◯: μ k1 ≦ 0.26 Δ: 0.27 ≦ μ k1 ≦ 0.30 ×: μ k1 ≧ 0.31
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１９[Correction target item name] 0019
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１９】摩擦係数変化 前記μｋ１を測定後、トラック００にヘッドロードし
て、室温で７２時間連続走行させた後に、再度回転トル
クを測定し、摩擦係数（μｋ２）を算出し、μｋ１に対
するμｋ２の比をもって、摩擦係数変化率とし、次のよ
うに評価した。 ○：μｋ２／μｋ１＝１．００〜１．２０ △：μｋ２／μｋ１＝１．２１〜１．４０ ×：μｋ２／μｋ１１＞１．４０[0019] After measuring the friction coefficient change the mu k1, and head loading the truck 00, the After 72 hours of continuous running at room temperature, again measured torque, to calculate the coefficient of friction (μ k2), μ k1 The friction coefficient change rate was defined as the ratio of μ k2 to ◯: μ k2 / μ k1 = 1.00 to 1.20 Δ: μ k2 / μ k1 = 1.21 to 1.40 ×: μ k2 / μ k1 1> 1.40
【手続補正４】[Procedure amendment 4]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２１[Correction target item name] 0021
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２１】実施例１ メタル粉末（比表面積４２ｍ２／ｇ）１００部、バイン
ダー（極性基を有する塩化ビニル−酢酸ビニル樹脂とポ
リウレタン樹脂、およびバインダー全量に対し、２５重
量％のポリイソシアナートからなる架橋剤）３０．８
部、アルミナ（平均粒径０．４μｍ）１５．４部、潤滑
剤（ブチルステアレートとオレイルオレートとの混合
物）３．０部、シクロヘキサノン・トルエン混合溶剤４
００部を、公知の方法で混合分散させて、磁性塗液を調
製し、これを厚さ６２μｍのポリエステルフィルムに乾
燥、カレンダー後の塗布厚さが２．５μｍになるよう
に、両面に塗布し、磁気記録媒体を得た。Example 1 100 parts of metal powder (specific surface area 42 m 2 / g), binder (vinyl chloride-vinyl acetate resin having polar group and polyurethane resin), and 25% by weight of polyisocyanate based on the total amount of the binder. Crosslinking agent) 30.8
Parts, alumina (average particle size 0.4 μm) 15.4 parts, lubricant (mixture of butyl stearate and oleyl oleate) 3.0 parts, cyclohexanone / toluene mixed solvent 4
A magnetic coating liquid was prepared by mixing and dispersing 00 parts by a known method, and the magnetic coating liquid was dried on a polyester film having a thickness of 62 μm and coated on both sides so that the coating thickness after calendering was 2.5 μm. A magnetic recording medium was obtained.
【手続補正５】[Procedure Amendment 5]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２２[Name of item to be corrected] 0022
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２２】得られた磁気記録媒体を３．５インチのフ
ロッピーデイスクの形状に打抜き、日本ミクロコーテイ
ング（株）製、研磨テ＝プＷＡ１０，０００（平均砥粒
径０．５μｍのアルミナ粉を塗設したテープ）を用い
て、ソフトバーニッシュして表面仕上げを施し、１０Ｍ
Ｂのフロッピーデイスクとしての評価を表１に示す項目
について実施した。結果を表１に示す。The magnetic recording medium thus obtained was punched into a 3.5-inch floppy disk shape, and a polishing tape WA10,000 (produced by Nippon Micro Coating Co., Ltd.) was coated with alumina powder having an average abrasive grain size of 0.5 μm. 10M of soft burnishing and surface finishing
The evaluation of B as a floppy disk was carried out for the items shown in Table 1. The results are shown in Table 1.
【手続補正６】[Procedure correction 6]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２６[Correction target item name] 0026
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００２６】[0026]
【表１】 [Table 1]
Claims (5)
とを含む磁性塗液を塗布してなる磁性層を有する磁気記
録媒体において、磁性層の中心線平均粗さ（Ｒａ）が
４．０〜１０．０ｎｍであり、かつ表面粗さのピーク値
の最高値（Ｐ）が５０ｎｍ以下、バレイ値の最高値
（Ｖ）が２０ｎｍ以上であることを特徴とする磁気記録
媒体。1. A magnetic recording medium having a magnetic layer obtained by coating a magnetic coating liquid containing a ferromagnetic powder and a binder on a non-magnetic substrate, and the center line average roughness (Ra) of the magnetic layer is 4.0. A magnetic recording medium having a maximum surface roughness peak value (P) of 50 nm or less and a valley value maximum value (V) of 20 nm or more.
気記録媒体。2. The magnetic recording medium according to claim 1, wherein the P value is not more than the V value.
フェライト系粉末である請求項１または２記載の磁気記
録媒体。3. The magnetic recording medium according to claim 1, wherein the ferromagnetic powder is a metal-based powder or a barium ferrite-based powder.
項１〜３のいずれか１項記載の磁気記録媒体。4. The magnetic recording medium according to claim 1, wherein the recording density is 20 kbpi or more.
１〜４のいずれか１項記載の磁気記録媒体。5. The magnetic recording medium according to claim 1, which is used in a floppy disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36044992A JPH06203356A (en) | 1992-12-28 | 1992-12-28 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36044992A JPH06203356A (en) | 1992-12-28 | 1992-12-28 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06203356A true JPH06203356A (en) | 1994-07-22 |
Family
ID=18469453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36044992A Pending JPH06203356A (en) | 1992-12-28 | 1992-12-28 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06203356A (en) |
-
1992
- 1992-12-28 JP JP36044992A patent/JPH06203356A/en active Pending
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