JPH01300420A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH01300420A JPH01300420A JP13199188A JP13199188A JPH01300420A JP H01300420 A JPH01300420 A JP H01300420A JP 13199188 A JP13199188 A JP 13199188A JP 13199188 A JP13199188 A JP 13199188A JP H01300420 A JPH01300420 A JP H01300420A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- fatty acid
- magnetic layer
- melting point
- 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
- 239000000314 lubricant Substances 0.000 claims abstract description 32
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 15
- 239000000194 fatty acid Substances 0.000 claims abstract description 15
- 229930195729 fatty acid Natural products 0.000 claims abstract description 15
- -1 fatty acid ester Chemical class 0.000 claims abstract description 15
- 239000006247 magnetic powder Substances 0.000 claims abstract description 15
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 11
- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
- 239000011148 porous material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 abstract description 6
- BARWIPMJPCRCTP-UHFFFAOYSA-N oleic acid oleyl ester Natural products CCCCCCCCC=CCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC BARWIPMJPCRCTP-UHFFFAOYSA-N 0.000 description 9
- BARWIPMJPCRCTP-CLFAGFIQSA-N oleyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC BARWIPMJPCRCTP-CLFAGFIQSA-N 0.000 description 9
- NHUXFMNHQIITCP-UHFFFAOYSA-N 2-butoxyethyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCOCCCC NHUXFMNHQIITCP-UHFFFAOYSA-N 0.000 description 8
- 239000003973 paint Substances 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- FIENEGBWDWHXGG-YPKPFQOOSA-N hexyl (z)-octadec-9-enoate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCCCCCC FIENEGBWDWHXGG-YPKPFQOOSA-N 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- MHXBHWLGRWOABW-UHFFFAOYSA-N tetradecyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCCCCCCCCCCC MHXBHWLGRWOABW-UHFFFAOYSA-N 0.000 description 2
- PDDAEITXZXSQGZ-UHFFFAOYSA-N 2,2-bis(octadecanoyloxymethyl)butyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CC)(COC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC PDDAEITXZXSQGZ-UHFFFAOYSA-N 0.000 description 1
- LBUOSVPOVIEPLJ-SEYXRHQNSA-N 2-butoxyethyl (z)-octadec-9-enoate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCCOCCCC LBUOSVPOVIEPLJ-SEYXRHQNSA-N 0.000 description 1
- AXKLSEHRUHRCIJ-UHFFFAOYSA-N 3,3-bis(hydroxymethyl)butane-1,1,1,4-tetrol Chemical compound OCC(CO)(CO)CC(O)(O)O AXKLSEHRUHRCIJ-UHFFFAOYSA-N 0.000 description 1
- QBWKPGNFQQJGFY-QLFBSQMISA-N 3-[(1r)-1-[(2r,6s)-2,6-dimethylmorpholin-4-yl]ethyl]-n-[6-methyl-3-(1h-pyrazol-4-yl)imidazo[1,2-a]pyrazin-8-yl]-1,2-thiazol-5-amine Chemical compound N1([C@H](C)C2=NSC(NC=3C4=NC=C(N4C=C(C)N=3)C3=CNN=C3)=C2)C[C@H](C)O[C@H](C)C1 QBWKPGNFQQJGFY-QLFBSQMISA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 229940125846 compound 25 Drugs 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229940096388 ethylhexyl oleate Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- SLLMDHBKALJDBW-UHFFFAOYSA-N methyl 3-(4-hydroxyphenyl)-2-(phenylmethoxycarbonylamino)propanoate Chemical compound C=1C=CC=CC=1COC(=O)NC(C(=O)OC)CC1=CC=C(O)C=C1 SLLMDHBKALJDBW-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- TZXYSEYEGNHPQI-UHFFFAOYSA-N octadecyl dodecanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCCCCCCCCCC TZXYSEYEGNHPQI-UHFFFAOYSA-N 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁気記録媒体に係わり、さらに詳しく１） くは、その潤滑剤の改良に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic recording medium, and more particularly 1) In particular, it relates to improvements in the lubricant.
〔従来の技術Ｊ
磁気記録媒体に対する高密度記録化の要求は、近年基々
強くなってきている。中でもコンピュータ用ファイルメ
モリとして使用される磁気ディスク型の媒体は、その小
型化に伴う記録密度の向上が是非必要となっている。こ
の要求に対応するものとして板状六万品フェライト磁性
粉を用いた媒体が、従来から使用されている塗布技術の
応用で製造できる高記録密度媒体として特に開発が望ま
れている。この磁気ディスク型の媒体は、その使用頻度
が大きいため、実装状態における耐久性等、信頼性の向
上が必要とされている。[Prior Art J The demand for high-density recording in magnetic recording media has been increasing steadily in recent years. In particular, magnetic disk-type media used as file memories for computers are in desperate need of improved recording density as they become smaller. In order to meet this demand, a medium using plate-shaped 60,000-piece ferrite magnetic powder is particularly desired to be developed as a high recording density medium that can be manufactured by applying conventionally used coating techniques. Since this magnetic disk type medium is frequently used, it is necessary to improve reliability such as durability in the mounted state.
耐久性向上のため、従来からの針状磁性粉を用いた媒体
では、潤滑剤として常温で液体のものが多く用いられ一
応の性能が確保されている。In order to improve durability, conventional media using acicular magnetic powder often use lubricants that are liquid at room temperature to ensure a certain level of performance.
一方、板状六方晶フェライト磁性粉を用いた媒体では、
このような常温で液体の潤滑剤を用いたのでは、特に低
温度下における磁気記録媒体の摩擦係数が増大し、耐久
性が低■するという問題点を有している。On the other hand, in a medium using plate-shaped hexagonal ferrite magnetic powder,
The use of such a lubricant that is liquid at room temperature has the problem that the coefficient of friction of the magnetic recording medium increases, particularly at low temperatures, and the durability decreases.
この発明は、上記高記録密度、磁気記録媒体が持ってい
た磁性層の摩擦係数が大きいという欠点を解決し、以っ
て耐久性に優れた磁気記録媒体を提供することを目的と
する。The object of the present invention is to solve the drawback that the high recording density and magnetic recording medium has a large friction coefficient of the magnetic layer, and thereby provide a magnetic recording medium with excellent durability.
〔問題を解決するための手段」
本発明者らは、上記従来品が持っていた欠点を改良する
ために、鋭意検討を行った結果、磁性１−に含有させる
潤滑剤として融点が１５℃以上の脂肪酸エステルと融点
が１０℃未満の脂肪酸エステルとの混合物ｋ、融点が１
５℃以上の脂肪酸エステルの配合量を１０重量％〜４０
重量％となるようにする。この混合物を磁性層中に存在
する空孔体積の４０％〜９０％に充填されるよう添加し
た場合、磁気記録媒体の実装耐久性が飛躍的に向上する
ことを見出し、本発明をなすに至った。[Means for Solving the Problem] In order to improve the drawbacks of the above-mentioned conventional products, the inventors of the present invention conducted intensive studies and found that a lubricant with a melting point of 15°C or higher was incorporated into magnetic 1-. and a fatty acid ester with a melting point of less than 10°C, a mixture k with a melting point of 1
The amount of fatty acid ester with a temperature of 5℃ or higher is 10% by weight to 40%.
% by weight. It has been discovered that when this mixture is added to fill 40% to 90% of the volume of the pores existing in the magnetic layer, the mounting durability of the magnetic recording medium is dramatically improved, and this has led to the present invention. Ta.
この発明でいう融点が１５℃以上の脂肪酸エステルとし
ては、例えば、ステアリルラウレート、ミリスチルラウ
レート、ステアリン酸ブチルセロソルダ、トリメチロー
ルプロパントリステアレート、ミリスチルステアレート
などが挙げられる。Examples of fatty acid esters having a melting point of 15° C. or higher in the present invention include stearyl laurate, myristyl laurate, butylcellosolder stearate, trimethylolpropane tristearate, and myristyl stearate.
また、融点が１０℃未満の脂肪酸エステルとしでは、オ
レイルオレート、ヘキシルオレート、トリメチロールプ
ロパントリオレート、オレイン酸ブチルセロソルブ、２
−エチルへキシルオレート、 □ヘキシルオレー
トなどが挙げられる。In addition, fatty acid esters with a melting point of less than 10°C include oleyl oleate, hexyl oleate, trimethylolpropane triolate, butyl cellosolve oleate,
-Ethylhexyl oleate, □hexyl oleate, etc.
板状六方晶フェライト磁性粉を用いた磁気記録媒体は、
當温で液体である潤滑剤を磁性層に添加した場合、磁性
層の摩擦係数が低温度時に増大し、耐久性が低下する。A magnetic recording medium using plate-shaped hexagonal ferrite magnetic powder is
When a lubricant that is liquid at low temperatures is added to the magnetic layer, the friction coefficient of the magnetic layer increases at low temperatures, resulting in decreased durability.
潤滑剤として融点が１０℃未満の潤滑剤を主体とし、こ
れに融点が１５℃以上の潤滑剤を１０３ｉ量％〜４０電
濾％配合した混合潤滑剤を用いると、低温時でも摩擦係
数の増大が極めて少なくなる。この配合量がｌＯ重ｆｆ
ｉ％以下になると摩擦係数低減効果は少なく、また４０
重量％より多くなった場合にも、摩擦係数低減が少なく
なる。If a mixed lubricant is used that is mainly composed of a lubricant with a melting point of less than 10°C, and a lubricant with a melting point of 15°C or higher is blended in an amount of 103i to 40%, the coefficient of friction will increase even at low temperatures. becomes extremely small. This blending amount is lO heavyff
If it is less than i%, the effect of reducing the friction coefficient is small, and 40
If the amount is greater than % by weight, the reduction in the coefficient of friction will also be reduced.
一方、高温時における媒体の耐久性については、融点が
１０℃未満の潤滑剤の場合には、その揮発速度が早いた
め、潤滑剤が磁性ノーから揮散し、長期間保管した場合
などに潤滑剤不足となり、耐久性が低下する。このため
、融点の低い潤滑剤に融点の高い潤滑剤を混合すると、
この潤滑剤の散逸が防がれ、長期間にわたって良好な潤
滑作用が保たれ、優れた耐久性を示す媒体が得られたも
のと考えられる。On the other hand, regarding the durability of the medium at high temperatures, in the case of lubricants with a melting point of less than 10°C, the rate of volatilization is fast, so the lubricant volatilizes from the magnetic layer, and when stored for a long time, the lubricant This will result in a shortage and reduce durability. Therefore, when a lubricant with a high melting point is mixed with a lubricant with a low melting point,
It is considered that this lubricant was prevented from dissipating, maintaining good lubricating action over a long period of time, and resulting in a medium exhibiting excellent durability.
磁性層への潤滑剤の添加量については、針状磁性粉を用
いていた従来の磁気ディスクは、添加量が多ければ多い
程、実装耐久性は向上する傾向を示していた。これに対
し、板状六方晶フェライト磁性粉を用いた磁気ディスク
では、磁性層中に存在する空孔を完全に潤滑剤で満たす
と、磁気ヘッドと磁性層との摩擦力が急激に増大するこ
とが認められる。このため、潤滑剤の添加量は、磁性層
中の空孔の９０％を占める量までが適当である。Regarding the amount of lubricant added to the magnetic layer, conventional magnetic disks using acicular magnetic powder showed a tendency that the larger the amount added, the better the mounting durability. On the other hand, in a magnetic disk using plate-shaped hexagonal ferrite magnetic powder, when the pores in the magnetic layer are completely filled with lubricant, the frictional force between the magnetic head and the magnetic layer increases rapidly. is recognized. Therefore, the appropriate amount of lubricant to be added is an amount that accounts for 90% of the pores in the magnetic layer.
一方、添加量が少ない場合にはその潤滑効果がな（なり
、少なくとも空孔の４０％以上の添加が好ましい。On the other hand, if the amount added is small, the lubricating effect will be lost. Therefore, it is preferable to add at least 40% of the pores.
この発明で使用する板状六方晶フェライト磁性粉として
は、ガラス結晶化法あるいは、水熱法などの手段により
合成されたもので、次の一般式で表わされるものである
。The plate-shaped hexagonal ferrite magnetic powder used in the present invention is synthesized by a glass crystallization method, a hydrothermal method, or the like, and is represented by the following general formula.
ＡＯ−ｎ（ＣＦｅ、−１（ｘ＋ｙ）・Ｍ”ｘ±Ｍ’ｙ″
！ｌｉｚ Ｏａ ）（式中ＡはＢａＸＳｒ、 Ｐｂ、
Ｃａの中から選ばれる２＋
少なくとも１種の金属、Ｍ はＭｎ、 Ｃｏ、 Ｎｉ、
Ｃｕ、 Ｚｎ、 Ｍｇの中から選ばれる少くとも１種の
２価金属イオン、Ｍ４＋はＴｉ、 Ｚｒ、 Ｓｎ、 Ｇ
ｅ、Ｖ、Ｎｂの中から選ばれる少くとも１種の４価金属
イオン、ｎは３〜８の実数、Ｘｌ ｙは（ｘ十ｙ ）が
０．０２−０．３でｘ／ｙが、１−１０となる実数であ
る。）
このフェライト磁性粉の保磁力としては、一般に２００
〜２，０ＯＯＯｅの範囲にあるものが望ましい。２００
０ｅより小さくなると、高密度記録が良好に行えず、２
，０Ｏ００ｅより大きくなると、磁気記録媒体の記録素
子として適さなくなる。また粒子径としては六角板の平
均長径が０．０２〜０．５μｍの範囲にあるのが望まし
い。この値が０．０２．ＩＩｍよりも小さ（なると十分
な磁性を持たせにくく、０．５μｍより大きくなると磁
性層の表面平滑性が低下し、高密度記録を良好に行えな
い。AO-n(CFe, -1(x+y)・M"x±M'y"
! liz Oa ) (wherein A is BaXSr, Pb,
2+ At least one metal selected from Ca, M is Mn, Co, Ni,
At least one type of divalent metal ion selected from Cu, Zn, Mg, M4+ is Ti, Zr, Sn, G
At least one type of tetravalent metal ion selected from e, V, and Nb, n is a real number from 3 to 8, Xly is (x y) is 0.02-0.3, and x/y is It is a real number that is 1-10. ) The coercive force of this ferrite magnetic powder is generally 200
A range of 2,0 OOOe is desirable. 200
If it is smaller than 0e, high-density recording cannot be performed well, and 2
, 0O00e, it becomes unsuitable as a recording element of a magnetic recording medium. Further, as for the particle size, it is desirable that the average length of the hexagonal plate is in the range of 0.02 to 0.5 μm. This value is 0.02. If it is smaller than IIm, it will be difficult to have sufficient magnetism, and if it is larger than 0.5 μm, the surface smoothness of the magnetic layer will deteriorate, making it difficult to perform high-density recording.
磁気記録媒体は、板状六方晶フェライト磁性粉を結合剤
樹脂、上述の混合潤滑剤、有機溶剤などと共に混合分散
して磁性塗料を調製し、この塗料をポリエステルフィル
ムなどの基体上にロールコータなどの任意の塗布手段に
よって塗布、乾燥して磁性１−を形成することにより得
ることができる。Magnetic recording media are produced by mixing and dispersing plate-shaped hexagonal ferrite magnetic powder with a binder resin, the above-mentioned mixed lubricant, an organic solvent, etc. to prepare a magnetic paint, and applying this paint onto a substrate such as a polyester film using a roll coater or the like. It can be obtained by coating by any coating means and drying to form magnetic 1-.
あるいは、潤滑剤は磁性塗料中に添加するのでなく、磁
性層形成後、潤滑剤溶液中に磁性１−を浸漬するとか、
磁性層表面に塗布する方法によって、磁性層中に含浸さ
せることもできる。Alternatively, instead of adding the lubricant to the magnetic paint, after forming the magnetic layer, the magnetic 1- is immersed in a lubricant solution.
It can also be impregnated into the magnetic layer by applying it to the surface of the magnetic layer.
磁性塗料を基体上に塗布したのち磁性層面に対して垂直
方向に磁場を印加して磁場配向を行うと、磁化容易方向
がより良好に垂直方向に配向されるとともに、磁性層の
表面平滑性も良好となるため、磁場配向を行うのが好ま
しい。By applying a magnetic field perpendicularly to the surface of the magnetic layer after applying the magnetic paint onto the substrate to perform magnetic field orientation, the direction of easy magnetization can be better oriented perpendicularly, and the surface smoothness of the magnetic layer can also be improved. For better results, it is preferable to perform magnetic field orientation.
前記磁性塗料の調製に用いる結合剤樹脂としては、例え
ば、塩化ビニル−酢酸ビニル共重合体、ポリビニルブチ
ラール樹脂、繊維素系樹脂、ポリウレタン系樹脂、イン
シアネート化合物、放射線硬化型樹脂など従来から汎用
されている結合剤樹脂が広く用いられる。Examples of binder resins used in the preparation of the magnetic paint include vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, cellulose resins, polyurethane resins, incyanate compounds, and radiation-curable resins. Binder resins are widely used.
また、有機溶剤としては、トルエン、メチルエチルケト
ン、メチルイソブチルケトン、シクロヘキサノン、テト
ラヒドロフラン、酢酸エチルなど従来から汎用されてい
る有機溶剤を単独または２種以上混合して使用する。As the organic solvent, conventionally used organic solvents such as toluene, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, tetrahydrofuran, and ethyl acetate may be used alone or in combination of two or more.
なお、磁性塗料中１こは通常使用されている各種添加剤
、たとえば、分散剤、研磨剤、帯電防止剤などを任意に
添加使用してもよい。Incidentally, various commonly used additives such as dispersants, abrasives, antistatic agents, etc. may be optionally added to the magnetic coating material.
以ド、本発明を実施例に基づき詳説する。 Hereinafter, the present invention will be explained in detail based on examples.
実施例１
六方晶フェライト磁性粉 １０００部（板状比
：５、粒径：００５μｍ１
Ｈｃ：６２００ｅ、 ｃ（ｓ＝５７ｅｍｕ／、ＩＦ）
塩ビー酢ビービニルアルコール共Ｍ合体１３７．５７７
（ＵＣＣ社製、ＶＡＧＨ）
ポリウレタン樹脂 ８７．５ ｎ（
本日本インキ社製： Ｔ５２０１）
（χ−Ａ１２０３１００部
メチルイソブチルケトン ８００ ｕトルエ
ン ８００〃上記組成物を３
日間混合分散を行った後、これに
オレイルオレート ６４部ステア
リン酸ブチルセロソルブ ｌ ５ ｒｔ３官１
ｊ目性インシアネート化合物 ２５ 、ｊ（日
本ポリウレタン社製、コロネートし）を加え、さらに２
時間混合分散して、磁性塗料を調製した。この磁性塗料
を厚さ７５μｍのポリエステルフィルムの両面に塗布、
乾燥して磁性ノーを形成した。ついで平滑化処理を行っ
た後、所定の径の円板状に打ち抜き、フロッピーディス
クを作製した。平滑化処理後の磁性層の厚さは３μｍで
あった。Example 1 1000 parts of hexagonal ferrite magnetic powder (plate ratio: 5, particle size: 005 μm1 Hc: 6200e, c (s = 57 emu/, IF)
Salt, vinegar, vinyl alcohol co-M combination 137.577
(Manufactured by UCC, VAGH) Polyurethane resin 87.5 n (
Manufactured by Nippon Ink Co., Ltd.: T5201) (χ-A1203 100 parts Methyl isobutyl ketone 800 u Toluene 800
After mixing and dispersing for several days, oleyl oleate 64 parts butyl cellosolve stearate 1 5 rt3
Add J-order incyanate compound 25, j (manufactured by Nippon Polyurethane Co., Ltd., Coronat),
A magnetic paint was prepared by time-mixing and dispersing. This magnetic paint is applied to both sides of a 75 μm thick polyester film.
It dried to form a magnetic no. After smoothing, it was punched out into a disk shape with a predetermined diameter to produce a floppy disk. The thickness of the magnetic layer after the smoothing treatment was 3 μm.
実施例２
実施例１におけるオレイルオレートとステアリン酸ブチ
ルセロソルブの添加量、６４部および１６部をそれぞれ
４８部、１２部に変更した以外は、実施例１と同様にし
てフロッピーディスクを作製した。Example 2 A floppy disk was produced in the same manner as in Example 1, except that the amounts of oleyl oleate and butyl cellosolve stearate, 64 parts and 16 parts, were changed to 48 parts and 12 parts, respectively.
実施例３゜
実施例１におけるオンイルオレートとステアリン酸ブチ
ルセロソルブの添加ｆｉ６４部および１６部をそれぞれ
５６部、２４部に変更した以外は実施例１と同様（こし
てフロッピーディスクを作製した。Example 3 The same procedure as in Example 1 was repeated except that the addition fi of 64 parts and 16 parts of onylolate and butyl cellosolve stearate in Example 1 was changed to 56 parts and 24 parts, respectively (a floppy disk was prepared by straining).
比較例１゜
実施例１におけるオレイルオレートとステアリン酸ブチ
ルセロソルブの添加量６４部および１６部をそれぞれ８
０部、２０部に変更した以外は実施例１と同様にしてフ
ロッピーディスクを作製した。Comparative Example 1゜The added amounts of oleyl oleate and butyl cellosolve stearate in Example 1 were 64 parts and 16 parts, respectively.
A floppy disk was produced in the same manner as in Example 1 except that the amounts were changed to 0 and 20 parts.
比較例２
実施例１におけるオレイルオレートとステアリン酸ブチ
ルセロソルブの添加量６４部および１６部を、オレイル
オレート１００部のみに変えた以外は、実施例１と同様
ｌこしてフロッピーディスクを作製した。Comparative Example 2 A floppy disk was prepared in the same manner as in Example 1, except that only 100 parts of oleyl oleate was added instead of 64 parts and 16 parts of oleyl oleate and butyl cellosolve stearate in Example 1.
比較例３゜
実施例１におけるオレイルオレートとステアリン酸ブチ
ルセロソルブの添加量６４部および１６部の代りにオレ
イルオレート８０部のみに変えた以外は実施例１と同様
にしてフロッピーディスクを作製した。Comparative Example 3 A floppy disk was produced in the same manner as in Example 1, except that only 80 parts of oleyl oleate was used instead of the 64 parts and 16 parts of oleyl oleate and butyl cellosolve stearate in Example 1.
比較例４
実施例１におけるオレイルオレートとステアリン酸ブチ
ルセロソルブの添加ｆｉ６４部および１６部の代りに、
ステアリン酸ブチルセロソルブ８０部のみに変えた以外
は実施例１と同様にしてフロッピーディスクを作製した
。Comparative Example 4 Instead of adding fi 64 parts and 16 parts of oleyl oleate and butyl cellosolve stearate in Example 1,
A floppy disk was prepared in the same manner as in Example 1 except that only 80 parts of butyl cellosolve stearate was used.
上記各実施例、比較例で得たフロッピーディスクの特性
を表１こ示す。Table 1 shows the characteristics of the floppy disks obtained in each of the above Examples and Comparative Examples.
ここで、磁性１ｍ中の空孔の体積および空孔体積中に占
める潤滑剤量は次のようにして求めた。すなわち、磁性
塗膜の最大磁束密度を測定することにより、単位体積中
に存在する磁性粉の体積を求め、単位体積中には仕込ん
だ組成で磁性粉および他の固形分が存在するとして計算
して求めた。Here, the volume of pores in 1 m of magnetic material and the amount of lubricant occupying the pore volume were determined as follows. In other words, the volume of magnetic powder present in a unit volume is determined by measuring the maximum magnetic flux density of the magnetic coating film, and the calculation is performed assuming that magnetic powder and other solids exist in the unit volume according to the charged composition. I asked.
耐久性の測定は、市販のフロッピーディスクドライブを
用いて、６０℃、相対湿度１０％、５℃、相対湿度ｌＯ
％、および６０℃０℃相対湿０％と５℃相対湿度１０％
の条件を６時間ごとに繰り返すという３条件において評
価した。Durability was measured using a commercially available floppy disk drive at 60°C, 10% relative humidity, and 5°C, relative humidity lO
%, and 60℃ 0℃ relative humidity 0% and 5℃ relative humidity 10%
The evaluation was performed under three conditions in which the conditions were repeated every 6 hours.
表
〔発明の効果〕
して、融点１５℃以上の脂肪酸エステルの含有量が１０
重量％〜４０重量％とじ、磁性層中に存在する空孔体積
の４０％〜９０％を占めるように添加した場合、その磁
気配録媒体の低温時および低温、高温繰り返しの環境下
での耐久性を、単独の脂肪酸エステルを用いた媒体およ
び混合潤滑剤を過剰に磁性層に添加した媒体に比し格段
に向上させることができる。Table [Effect of the invention] The content of fatty acid ester with a melting point of 15°C or higher is 10
If it is added in an amount of 40% to 40% by weight and occupies 40% to 90% of the volume of pores existing in the magnetic layer, the durability of the magnetic recording medium at low temperatures and in environments where low and high temperatures are repeated. The properties of the magnetic layer can be significantly improved compared to a medium using a single fatty acid ester and a medium in which an excessive amount of a mixed lubricant is added to the magnetic layer.
出願人 日立マクセル株式会社 代表者 永 井 厚Applicant: Hitachi Maxell, Ltd. Representative Atsushi Nagai
Claims (2)
含む磁性層を設けてなる磁気記録媒体において、磁性層
に含有させる潤滑剤として、融点が１５℃以上の脂肪酸
エステルと融点が１０℃未満の脂肪酸エステルとを用い
、潤滑剤の合計体積が、磁性層中に存在する空孔体積の
４０％〜９０％の範囲内であることを特徴とする磁気記
録媒体。(1) In a magnetic recording medium in which a magnetic layer containing plate-shaped hexagonal ferrite magnetic powder is provided on a non-magnetic support, a fatty acid ester with a melting point of 15° C. or higher and a fatty acid ester with a melting point of 10° C. or higher are contained as lubricants in the magnetic layer. A magnetic recording medium characterized in that the total volume of the lubricant is within the range of 40% to 90% of the volume of pores present in the magnetic layer.
℃未満の脂肪酸エステルとの混合潤滑剤において、融点
１５℃以上の脂肪酸エステルの含有量が１０重量％〜４
０重量％の範囲内である混合潤滑剤を用いたことを特徴
とする請求項（１）記載の磁気記録媒体。(2) Fatty acid ester with a melting point of 15°C or higher and a melting point of 10°C
In mixed lubricants with fatty acid esters having a melting point of less than 15°C, the content of fatty acid esters having a melting point of 15°C or higher is 10% by weight to 4%.
The magnetic recording medium according to claim 1, characterized in that a mixed lubricant is used in a range of 0% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13199188A JPH01300420A (en) | 1988-05-30 | 1988-05-30 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13199188A JPH01300420A (en) | 1988-05-30 | 1988-05-30 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01300420A true JPH01300420A (en) | 1989-12-04 |
Family
ID=15070998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13199188A Pending JPH01300420A (en) | 1988-05-30 | 1988-05-30 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01300420A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61294637A (en) * | 1985-06-20 | 1986-12-25 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS62219324A (en) * | 1986-03-20 | 1987-09-26 | Hitachi Maxell Ltd | Magnetic recording medium |
-
1988
- 1988-05-30 JP JP13199188A patent/JPH01300420A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61294637A (en) * | 1985-06-20 | 1986-12-25 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS62219324A (en) * | 1986-03-20 | 1987-09-26 | Hitachi Maxell Ltd | Magnetic recording medium |
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