JPH04195722A - Magnetic disk - Google Patents
Magnetic diskInfo
- Publication number
- JPH04195722A JPH04195722A JP32359890A JP32359890A JPH04195722A JP H04195722 A JPH04195722 A JP H04195722A JP 32359890 A JP32359890 A JP 32359890A JP 32359890 A JP32359890 A JP 32359890A JP H04195722 A JPH04195722 A JP H04195722A
- Authority
- JP
- Japan
- Prior art keywords
- fatty acid
- ester
- magnetic
- molecular weight
- amount
- 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 36
- -1 aliphatic alkoxy ester Chemical class 0.000 claims abstract description 30
- 239000000314 lubricant Substances 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 43
- 229930195729 fatty acid Natural products 0.000 claims description 43
- 239000000194 fatty acid Substances 0.000 claims description 43
- 239000011230 binding agent Substances 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 6
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- 229920006267 polyester film Polymers 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 2
- 239000002216 antistatic agent Substances 0.000 claims 1
- 239000002904 solvent Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000005461 lubrication Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 17
- BARWIPMJPCRCTP-UHFFFAOYSA-N oleic acid oleyl ester Natural products CCCCCCCCC=CCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC BARWIPMJPCRCTP-UHFFFAOYSA-N 0.000 description 7
- BARWIPMJPCRCTP-CLFAGFIQSA-N oleyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC BARWIPMJPCRCTP-CLFAGFIQSA-N 0.000 description 7
- 230000001050 lubricating effect Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- NHUXFMNHQIITCP-UHFFFAOYSA-N 2-butoxyethyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCOCCCC NHUXFMNHQIITCP-UHFFFAOYSA-N 0.000 description 2
- SFAAOBGYWOUHLU-UHFFFAOYSA-N 2-ethylhexyl hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)OCC(CC)CCCC SFAAOBGYWOUHLU-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 101100524582 Arabidopsis thaliana RH13 gene Proteins 0.000 description 1
- GWFGDXZQZYMSMJ-UHFFFAOYSA-N Octadecansaeure-heptadecylester Natural products CCCCCCCCCCCCCCCCCOC(=O)CCCCCCCCCCCCCCCCC GWFGDXZQZYMSMJ-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- JYTMDBGMUIAIQH-UHFFFAOYSA-N hexadecyl oleate Natural products CCCCCCCCCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC JYTMDBGMUIAIQH-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- JYTMDBGMUIAIQH-ZPHPHTNESA-N palmityl oleate Chemical compound CCCCCCCCCCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC JYTMDBGMUIAIQH-ZPHPHTNESA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004381 surface treatment Methods 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、ポリエステルフィルム等の基体上に強磁性体
としてメタル磁性粉または酸化鉄磁性粉を含有する磁性
塗料を塗布して磁性塗膜を形成した磁気ディスクに関す
る。[Detailed Description of the Invention] Industrial Field of Application The present invention is a method of forming a magnetic coating film by applying a magnetic paint containing metal magnetic powder or iron oxide magnetic powder as a ferromagnetic material onto a substrate such as a polyester film. Regarding magnetic disks.
従来の技術
近年、パソコン等の外部記録媒体としてフロッピーディ
スクが広く用いられている。このフロンピーディスクは
、ポリエステル等の基体−［に磁性塗料を塗布し、表面
処理した後、硬化し、円盤状に打ち抜き、表面研磨され
、所定のケースに収納されたものである。2. Description of the Related Art In recent years, floppy disks have been widely used as external recording media for personal computers and the like. This floppy disk is made by coating a base material such as polyester with magnetic paint, subjecting it to surface treatment, curing it, punching it out into a disc shape, polishing the surface, and storing it in a predetermined case.
また高記録密度を実現しようとする場合、強磁性粉とし
ては一般にＢＥＴ表面積が４８ボ／ｇ以上のものが用い
られており、さらにＢＥＴ表面積を大きくすることが試
みられいる。このような微粒子のメタル磁性粉を用いた
フロンピーディスクは表面平滑性が得られ易くヘンド出
力の向上も容易であり、また媒体からのノイズも低下し
高Ｓ／Ｎが得られ易い、さらに周波数特性も向上し高密
度記録に適したものである。Further, when attempting to achieve high recording density, ferromagnetic powder having a BET surface area of 48 bo/g or more is generally used, and attempts are being made to further increase the BET surface area. Frumpy disks using such fine-grained metal magnetic powder can easily obtain surface smoothness and improve the hend output, as well as reduce noise from the medium and easily obtain high S/N ratio. It also has improved characteristics and is suitable for high-density recording.
発明が解決しようとする課題
しかしながら上記従来の磁気ディスクでは、磁性粉表面
積の大きい磁性粉はど磁性粉が微粒子化し、塗膜強度を
向上することが難しく、各環境下での耐久性をすべて向
上させることが困難である。Problems to be Solved by the Invention However, in the above-mentioned conventional magnetic disks, the magnetic powder with a large surface area becomes fine particles, making it difficult to improve the strength of the coating film, and it is difficult to improve the durability under various environments. It is difficult to do so.
さらに表面の平滑性を向上させることは耐久性の向上を
妨げる結果となる。これらの理由から、あらゆる環境下
での高い耐久性を達成することが難しいという課題を有
していた。Furthermore, improving the surface smoothness results in hindering the improvement of durability. For these reasons, it has been difficult to achieve high durability under all environments.
本発明は上記課題を解決するものであり、名環境下にお
いて優れた耐久性を有する磁気ディスクを提供すること
を目的とするものである。The present invention is intended to solve the above problems, and aims to provide a magnetic disk that has excellent durability under harsh environments.
課題を解決するための手段
本発明は上記目的を達成するために、磁性塗膜中に含有
される潤滑側として分子量が４５０以下の脂肪酸アルコ
キシエステルと一５℃で液状の分子量４５０以下の脂肪
酸アルキルエステルを含有し、さらに必要に応じて分子
量５００以上の脂肪酸エステルを付加したものである。Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention provides a lubricant containing in a magnetic coating film a fatty acid alkoxy ester having a molecular weight of 450 or less and a fatty acid alkyl having a molecular weight of 450 or less that is liquid at -5°C. It contains an ester, and if necessary, a fatty acid ester having a molecular weight of 500 or more is added.
作用
したがって本発明によれば、磁性塗膜中に含有される潤
滑側として分子量が４５０以下の脂肪酸アルコキシエス
テルとさらに一５℃で液状の分子量４５０以下の脂肪酸
アルキルエステルをともに用いることにより、また必要
に応して分子１５００以上の脂肪酸エステルを付加する
ことにより、潤滑効果を向上させ、かつ優れた耐久性を
得ることができる。Therefore, according to the present invention, by using both a fatty acid alkoxy ester with a molecular weight of 450 or less and a fatty acid alkyl ester with a molecular weight of 450 or less that is liquid at -5°C as a lubricant contained in the magnetic coating film, the necessary By adding a fatty acid ester having a molecular weight of 1,500 or more, it is possible to improve the lubricating effect and obtain excellent durability.
実施例 以下、本発明の一実施例について説明する。Example An embodiment of the present invention will be described below.
磁気ディスクの構成の要点はポリエステル等の基体上に
磁性塗料の塗布により磁性塗膜を設けることにあり、具
体的な実施例としては、厚みが３３μｍのポリエステル
フィルムの表面をコロナ放電等で活性化した後、第１表
に示す組成を有する磁性塗料を塗布し乾燥させ、さらに
カレンダー処理を行った。ここでの最終的な磁性塗膜の
厚さを３．５μｍになるように設定した。The key point in the construction of a magnetic disk is to provide a magnetic coating film by applying magnetic paint on a base material such as polyester.As a specific example, the surface of a 33 μm thick polyester film is activated by corona discharge, etc. After that, a magnetic paint having the composition shown in Table 1 was applied, dried, and further calendered. The final thickness of the magnetic coating film here was set to 3.5 μm.
その後、磁性塗膜を硬化させた後、直径２インチの円盤
状に打ち抜き、表面を研磨した後、所定のケースに収納
し、耐久性の評価を行った。Thereafter, after the magnetic coating was cured, it was punched out into a disk shape of 2 inches in diameter, the surface of which was polished, and then stored in a predetermined case to evaluate its durability.
（以 下 余 白）
第 １ 表
〔実施例１〜６〕
実施例１〜６では、分子量４５０以下の脂肪酸アルコキ
シエステルとしてステアリン酸ブトキシエチル、−５℃
で液状の分子量４５０以下の脂肪酸アルキルエステルと
してバルミチン酸２−エチルへキシルを用いた。(Margins below) Table 1 [Examples 1 to 6] In Examples 1 to 6, butoxyethyl stearate was used as a fatty acid alkoxy ester with a molecular weight of 450 or less, at -5°C.
2-ethylhexyl valmitate was used as a liquid fatty acid alkyl ester having a molecular weight of 450 or less.
実施例１〜６の潤滑剤量は第２表に示すとおりとし、磁
気ディスクの作製はすべて上記した実施例１のとおりと
した。The amounts of lubricants in Examples 1 to 6 were as shown in Table 2, and all magnetic disks were manufactured as in Example 1 described above.
実施例６では、ステアリン酸ブトキシエチルとパルミチ
ン酸２−エチルヘキシルの配合量を３０％とし、さらに
分子量５００以上の脂肪酸エステルとしてオレイン酸オ
レイルを１０％加えて全潤滑剤量を４０％にしである。In Example 6, the amount of butoxyethyl stearate and 2-ethylhexyl palmitate was 30%, and 10% of oleyl oleate was added as a fatty acid ester having a molecular weight of 500 or more to make the total amount of lubricant 40%.
第２表中の潤滑剤の配合量はバインダー樹脂に対する重
量％で示した。The amounts of lubricants in Table 2 are expressed in weight percent relative to the binder resin.
第２表
〔実施例７〜９〕
先の第１表に記載の実施例１の組成のうち各潤滑剤の種
類を第３表に示すように変更して実施例７〜９のサンプ
ルを作製した。Table 2 [Examples 7 to 9] Samples of Examples 7 to 9 were prepared by changing the type of each lubricant among the compositions of Example 1 listed in Table 1 as shown in Table 3. did.
Ｃ以 下 余 白）
〔比較例１〜７〕
次に比較例１〜７として、潤滑剤を先の第１表に記載の
実施例１と同し種類の潤滑剤に固定し、その比率および
配分量を第４表のように変更してサンプルを作製した。C below margin) [Comparative Examples 1 to 7] Next, as Comparative Examples 1 to 7, the lubricant was fixed to the same type of lubricant as in Example 1 listed in Table 1 above, and the ratio and Samples were prepared by changing the amounts distributed as shown in Table 4.
比較例２および比較例７では、ステアリン酸ブトキンエ
チルとパルミチン酸２−エチルヘキシルの他に脂肪酸エ
ステルとしてオレイン酸オレイルをそれぞれ１０％、１
５％加えている。In Comparative Example 2 and Comparative Example 7, in addition to butquinethyl stearate and 2-ethylhexyl palmitate, 10% and 1% of oleyl oleate were used as fatty acid esters, respectively.
Added 5%.
第４表
〔比較例８〜１０）
次に比較例８〜１０として、分子量４５０以下の脂肪酸
アルコキシエステルはステアリン酸ブトキノエチル乙こ
固定し、脂肪酸アルキルエステルを第５表に示すように
変更した。ここでの潤滑側の比率および配合量は第１表
に記載の実施例１と同様とした。Table 4 [Comparative Examples 8 to 10] Next, as Comparative Examples 8 to 10, the fatty acid alkoxy ester having a molecular weight of 450 or less was fixed to butoquinoethyl stearate, and the fatty acid alkyl ester was changed as shown in Table 5. The ratio and compounding amount on the lubricating side here were the same as in Example 1 listed in Table 1.
（以 下 余 白）
以上のように作製したサンプルについて耐久性試験を行
った。耐久性試験では初期ヘッド出力の７０％まで低下
した時点を寿命とした。(Margin below) A durability test was conducted on the sample prepared as described above. In the durability test, the life span was defined as the point in time when the head output decreased to 70% of the initial head output.
また、試験環境は４０℃〜８０％ＲＨ１３“Ｃ−５％Ｒ
Ｈ５３℃−８０％ＲＨの３環境とした。In addition, the test environment is 40℃~80%RH13"C-5%R
Three environments were used: H53°C and 80% RH.
耐久性試験の結果を実施例、比較例あわせて第６表に示
す０表中に記載した数値は実施例１の耐久性を１００と
して相対比較したものである。The results of the durability test are shown in Table 6 together with Examples and Comparative Examples.The numerical values listed in Table 0 are relative comparisons with the durability of Example 1 set as 100.
（以 下 余 白）
第６表
第６表において実施例２は脂肪酸アルコキシエステルを
１５％、脂肪酸アルキルエステルを１５％配合したもの
であり、実施例１に比べて耐久性も殆ど同じ値を示して
いる。このことは実施例６についても同様であり、実施
例６は実施例２の配合量にさらにオレイン酸オレイルを
１０％添加したもので、潤滑剤の総合有量としてはバイ
ンダー樹脂の４０％となっている。実施例６よりもさら
にオレイン酸オレイルを５％増量した比較例７では実施
例２、実施例６に比べて耐久は明らかに低下している。(Left below) Table 6 In Table 6, Example 2 contains 15% fatty acid alkoxy ester and 15% fatty acid alkyl ester, and exhibits almost the same durability as Example 1. ing. The same applies to Example 6, in which 10% of oleyl oleate is added to the blended amount of Example 2, and the total amount of lubricant is 40% of the binder resin. ing. In Comparative Example 7, in which the amount of oleyl oleate was further increased by 5% compared to Example 6, the durability was obviously lower than that of Examples 2 and 6.
したがって、潤滑剤の総合有量としてはバインダー樹脂
の４０％以下にすることが望ましいことがわかる。Therefore, it can be seen that the total amount of lubricant is desirably 40% or less of the binder resin.
比較例３は潤滑剤の総合有量が４０％であるが、脂肪酸
アルコキシルエステルおよび脂肪酸アルコキシエステル
が各々２０％含有されており、耐久性としてはそれほど
低下してはいないが、３℃の環境下で塗膜表面に潤滑剤
の結晶物をつくるため好ましくない、これら脂肪酸アル
コキシルエステルがバインダー樹脂に対して許容量を越
えたからである。したがって、脂肪酸アルコキシルエス
テルの配合量はバインダー樹脂に対して１５％以内とし
なければならないことがわかる。Comparative Example 3 has a total lubricant content of 40%, but contains 20% each of fatty acid alkoxy ester and fatty acid alkoxy ester, and although the durability has not deteriorated much, it is difficult to use in an environment of 3°C. This is because these fatty acid alkoxyl esters, which are undesirable because they form lubricant crystals on the coating surface, exceed the allowable amount for the binder resin. Therefore, it can be seen that the amount of fatty acid alkoxyl ester blended must be within 15% based on the binder resin.
実施例３は脂肪酸アルコキシエステルを５％、脂肪酸ア
ルキルエステルを５％配合したものであり、実施例１に
比べて潤滑剤の含有量が少ないが、耐久性に殆ど差は発
生していない、それに対して比較例！ではこの２種の潤
滑剤の含有量が実施例３に比べてさらに少なくなってお
り、耐久性も低くなっている。比較例２ではこの２種の
潤滑剤量は比較例１と同しであるが、潤滑剤の総合有量
をオレイン酸オレイルによって１５％に増加させたにも
かかわらず、耐久性は比較例１と同様実施例に比べて低
い値を示している。このことは、脂肪酸アルコキシエス
テルと脂肪酸アルキルエステルの量はバインダー樹脂に
対して少なくとも１０％は必要であることを意味してい
る。Example 3 contains 5% fatty acid alkoxy ester and 5% fatty acid alkyl ester, and has a lower lubricant content than Example 1, but there is almost no difference in durability. Comparative example! In this example, the content of these two types of lubricants was further reduced compared to Example 3, and the durability was also lower. In Comparative Example 2, the amounts of these two lubricants were the same as in Comparative Example 1, but even though the total amount of lubricants was increased to 15% by oleyl oleate, the durability was the same as in Comparative Example 1. Similarly, this value is lower than that of the example. This means that the amount of fatty acid alkoxy ester and fatty acid alkyl ester must be at least 10% based on the binder resin.
実施例４では、脂肪酸アルコキシエステル１５％、脂肪
酸アルキルエステル５％を含有しており、耐久性は実施
例】よりも若干向上傾向にある。しかし、比較例４に見
るように全潤滑剤の含有量は十分であっても脂肪酸アル
キルエステルを全く含有しないと耐久性は極端に低下す
る。このことから脂肪酸アルコキシエステルと脂肪酸ア
ルキルエステルの間には何等かの相互作用が働き潤滑効
果を相乗的に高めていると考えられる。同じように実施
例５と比較例５でもその相互作用が推察できる。比較例
６では３℃の環境下で塗膜表面に潤滑剤の結晶化に僚た
曇りを観察した。このように脂肪酸のアルコキシエステ
ルと脂肪酸アルキルエステルの相互作用による効果は配
合比３：ｌ〜１：２の間で得ることができた。しかし、
−５℃で固体となる脂肪酸アルキルエステルを用いた比
較例８〜１０ではその配合量が実施例１と同一であるに
もかかわらず、耐久性にそのような効果はみられていな
い。Example 4 contains 15% fatty acid alkoxy ester and 5% fatty acid alkyl ester, and the durability tends to be slightly improved compared to Example 4. However, as seen in Comparative Example 4, even if the total lubricant content is sufficient, if no fatty acid alkyl ester is contained, the durability is extremely reduced. From this, it is thought that some kind of interaction works between the fatty acid alkoxy ester and the fatty acid alkyl ester to synergistically enhance the lubricating effect. Similarly, this interaction can be inferred in Example 5 and Comparative Example 5 as well. In Comparative Example 6, clouding due to crystallization of the lubricant was observed on the coating film surface in an environment of 3°C. As described above, the effect due to the interaction between fatty acid alkoxy ester and fatty acid alkyl ester could be obtained at a blending ratio of 3:1 to 1:2. but,
In Comparative Examples 8 to 10 using fatty acid alkyl esters that become solid at -5° C., no such effect on durability was observed even though the blending amount was the same as in Example 1.
さらに−５℃で液状の脂肪酸アルキルエステルであれば
他の材料を用いても実施例７〜９に見られるように同様
の効果が得られた。Furthermore, as long as the fatty acid alkyl ester is liquid at -5°C, similar effects were obtained even when other materials were used, as seen in Examples 7 to 9.
ここで、分子量５００以上の脂肪酸エステルとして用い
たオレイン酸オレイルは潤滑剤の結晶化に殆ど影響をお
よぼさなかったことからオレイン酸オレイルの代わりに
オレイン酸ヘキサデシル、１ｓｏ−ステアリン酸ヘキサ
デシル、１ｓｏ−ステアリン酸ステアリルなど、または
これらの混合物でも同様の役割を果たすものと考えられ
る。Here, oleyl oleate, which was used as a fatty acid ester with a molecular weight of 500 or more, had almost no effect on the crystallization of the lubricant, so instead of oleyl oleate, hexadecyl oleate, 1so-hexadecyl stearate, 1so- Stearyl stearate, etc., or mixtures thereof are also thought to play a similar role.
このように上記実施例によれば、磁気ディスク中の潤滑
剤として分子量４５０以下の脂肪酸アルコキシエステル
と一５℃で液状の分子量４５０以下の脂肪酸アルキルエ
ステルを配合し、また必要に応して上記潤滑剤に分子量
５００以上の脂肪酸エステルを付加して用いているため
、潤滑効果を向上させ、かつ優れた耐久性を備えること
ができる。As described above, according to the above embodiment, a fatty acid alkoxy ester with a molecular weight of 450 or less and a fatty acid alkyl ester with a molecular weight of 450 or less that are liquid at -5°C are blended as lubricants in the magnetic disk, and the above-mentioned lubricant is used as a lubricant in the magnetic disk. Since a fatty acid ester having a molecular weight of 500 or more is added to the agent, the lubricating effect can be improved and excellent durability can be achieved.
発明の効果
本発明は上記実施例より明らかなように、高密度記録に
適した高い表面平滑性を有し、かつ各環境下での耐久性
にも優れた磁気ディスクを提供することができる。Effects of the Invention As is clear from the above embodiments, the present invention can provide a magnetic disk that has high surface smoothness suitable for high-density recording and has excellent durability under various environments.
Claims (5)
防止剤、研磨剤、バインダー樹脂、潤滑剤、溶剤等から
なる磁性塗料を塗布することによって磁性塗膜を形成す
る磁気ディスクであって、前記磁性塗膜中に含有される
潤滑剤として分子量４５０以下の脂肪酸アルコキシエス
テルおよび−５℃で液状の分子量４５０以下の脂肪酸ア
ルキルエステルが含有されている磁気ディスク。(1) A magnetic disk in which a magnetic coating film is formed by applying a magnetic paint consisting of magnetic powder, an antistatic agent, an abrasive, a binder resin, a lubricant, a solvent, etc. onto a substrate such as a polyester film, which comprises: A magnetic disk containing a fatty acid alkoxy ester having a molecular weight of 450 or less and a fatty acid alkyl ester having a molecular weight of 450 or less that is liquid at -5°C as a lubricant contained in a magnetic coating film.
いる請求項１記載の磁気ディスク。(2) The magnetic disk according to claim 1, which contains a fatty acid ester having a molecular weight of 500 or more.
テルとの配合比が３：１〜１：２の範囲にある請求項１
または２記載の磁気ディスク。(3) Claim 1 in which the blending ratio of fatty acid alkoxy ester and fatty acid alkyl ester is in the range of 3:1 to 1:2.
or the magnetic disk described in 2.
のバインダー樹脂の量に対して５〜１５重量％の範囲に
あり、かつ潤滑剤全体の含有量が磁性塗膜中のバインダ
ー樹脂の量に対して１０〜４０重量％の範囲にある請求
項１または２記載の磁気ディスク。(4) The blending amount of fatty acid alkoxy ester is in the range of 5 to 15% by weight based on the amount of binder resin in the magnetic coating, and the content of the entire lubricant is equal to the amount of binder resin in the magnetic coating. The magnetic disk according to claim 1 or 2, wherein the amount is in the range of 10 to 40% by weight.
のバインダー樹脂の量に対して５〜１５重量％の範囲に
あり、脂肪酸エステルの配合量が磁性塗膜中のバインダ
ー樹脂の量に対して０〜１０重量％（０を含まず）の範
囲にあって、かつ潤滑剤全体の含有量が磁性塗膜中のバ
インダー樹脂の量に対して１０〜４０重量％の範囲にあ
る請求項２記載の磁気ディスク。(5) The blending amount of fatty acid alkoxy ester is in the range of 5 to 15% by weight based on the amount of binder resin in the magnetic coating film, and the blending amount of fatty acid ester is in the range of 5 to 15% by weight based on the amount of binder resin in the magnetic coating film. 3. The lubricant content is in the range of 0 to 10% by weight (excluding 0), and the total content of the lubricant is in the range of 10 to 40% by weight based on the amount of binder resin in the magnetic coating film. magnetic disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32359890A JPH04195722A (en) | 1990-11-26 | 1990-11-26 | Magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32359890A JPH04195722A (en) | 1990-11-26 | 1990-11-26 | Magnetic disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04195722A true JPH04195722A (en) | 1992-07-15 |
Family
ID=18156503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32359890A Pending JPH04195722A (en) | 1990-11-26 | 1990-11-26 | Magnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04195722A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61230624A (en) * | 1985-04-04 | 1986-10-14 | Fuji Photo Film Co Ltd | Production of discoid magnetic recording medium |
-
1990
- 1990-11-26 JP JP32359890A patent/JPH04195722A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61230624A (en) * | 1985-04-04 | 1986-10-14 | Fuji Photo Film Co Ltd | Production of discoid magnetic recording medium |
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