JPS63255818A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS63255818A JPS63255818A JP62090446A JP9044687A JPS63255818A JP S63255818 A JPS63255818 A JP S63255818A JP 62090446 A JP62090446 A JP 62090446A JP 9044687 A JP9044687 A JP 9044687A JP S63255818 A JPS63255818 A JP S63255818A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- recording medium
- magnetic recording
- layer
- 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
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- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の分野〕
本発明は磁気記録媒体に関し、一層詳細には電磁変換特
性、走行耐久性の優れた磁気記録媒体に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium with excellent electromagnetic conversion characteristics and running durability.
磁気記録媒体においては、よシ高密度記録の要求が高ま
シ、その一つの解決手段として磁性層の表面を平滑にす
ることが知られている。In magnetic recording media, there is an increasing demand for high-density recording, and it is known that one way to solve this problem is to make the surface of the magnetic layer smooth.
しかしながら磁性層の表面を平滑にすると磁気記録媒体
の走行中において磁性層と装置系との接触の摩擦係数が
増大する結果、短期間の使用で磁気記録媒体の磁性層が
損傷を受け、あるいは磁性層が剥離する傾向がある。However, when the surface of the magnetic layer is made smooth, the friction coefficient of the contact between the magnetic layer and the device system increases while the magnetic recording medium is running. As a result, the magnetic layer of the magnetic recording medium may be damaged or the magnetic layer may be damaged after a short period of use. Layers tend to peel off.
特にビデオテープではステルモードのように磁性層を苛
酷な条件下におくことがあシ、このような条件下で使用
した場合、磁性層から強磁性粉末が脱落し易く、磁気ヘ
ッドの目詰まシの原因ともなる。In particular, in video tapes, the magnetic layer must be subjected to harsh conditions such as in stealth mode, and when used under such conditions, ferromagnetic powder easily falls off from the magnetic layer, which can lead to clogging of the magnetic head. It can also be the cause of
従来より磁性層の走行耐久性を向上させるための対策と
しては、磁性層にコランダム、炭化珪素、酸化クロムな
どの研磨材（硬質粒子）を添加する方法が提案されてい
るが、磁性層の走行耐久性を向上させる目的で磁性層に
研磨材を添加する場合には、研磨材を和尚多量に添加し
なければその添加効果が現れにくい。Conventionally, a method of adding abrasives (hard particles) such as corundum, silicon carbide, or chromium oxide to the magnetic layer has been proposed as a measure to improve the running durability of the magnetic layer. When an abrasive is added to the magnetic layer for the purpose of improving durability, the effect of the addition is difficult to be seen unless a large amount of the abrasive is added.
しかし、研磨材を多量に添加し良磁性層は、磁気ヘッド
などを著しく摩耗させる原因となシ、また磁性層を平滑
化して電磁変換特性を向上させるとの趣旨にも反するこ
ととな）好ましい方法であるとは言えない。However, a good magnetic layer with a large amount of abrasive added thereto does not cause significant wear on the magnetic head, etc., and also goes against the purpose of smoothing the magnetic layer and improving electromagnetic characteristics). I can't say it's a method.
また脂肪酸や脂肪酸と脂肪族アルコールとのエステルを
磁性層中に潤滑剤として添加し、摩擦係数を低減させる
ことも提案されている。It has also been proposed to add a fatty acid or an ester of a fatty acid and an aliphatic alcohol to the magnetic layer as a lubricant to reduce the coefficient of friction.
しかし、昨今のポータプルビデオテープレコーダやパー
ソナルコンピュータ用フレキシブルディスクドライブ装
置の普及にともない、磁気記録媒体の使用条件も低温下
での使用、あるいは高温高湿下での使用など様々な態様
が予測される。従って、磁気記録媒体は予測される徨々
の、条件下においてもその走行耐久性が変動することが
ないような安定したものでなければならないが、従来知
られているような潤滑剤では十分ではなかった。However, with the recent spread of portable video tape recorders and flexible disk drive devices for personal computers, various usage conditions for magnetic recording media are expected, such as use at low temperatures or use at high temperatures and high humidity. . Therefore, magnetic recording media must be stable so that their running durability does not change under various predicted conditions, but conventionally known lubricants are not sufficient. There wasn't.
特に、ビデオテープおよびフロッピーディスクにおいて
は、記録波長の短縮、トラック幅の短縮による記録媒体
の小型化が急速に進むにつれ、磁性体の材質は従来の酸
化鉄系の強磁性粉末よシ強磁性合金粉末がよく用いられ
るようになシ、強磁性粉末の太きさも、よシ小さいもの
が用いられるようになってきた。In particular, as recording media for video tapes and floppy disks rapidly become smaller due to shorter recording wavelengths and shorter track widths, magnetic materials are being made from ferromagnetic alloys instead of conventional iron oxide-based ferromagnetic powders. As ferromagnetic powder has come to be used more and more, the thickness of ferromagnetic powder has also become smaller.
このような急激な強磁性粉末の微粒子化により電磁変換
特性は比較的優れたものが得られるが、同時に走行耐久
性も向上させることは難しかった。Although it is possible to obtain relatively excellent electromagnetic conversion characteristics by rapidly reducing the size of the ferromagnetic powder to fine particles, it has been difficult to simultaneously improve running durability.
また従来より磁気記録媒体としてひろく用いられてきた
非磁性支持体上に強磁性粉末を有機バインダー中に分散
せしめた磁性層をもつ塗布型のものに対し、記録密度を
向上させるために真空蒸着、スパッタリング、イオンブ
レーティング等のペーパーデポジション、あるいは電気
メツキ法、無電解メッキ法等のメッキ法により形成され
る強磁性金属薄膜を磁気記録層とするバインダーを使用
しない、いわゆる金属薄膜型磁気記録媒体も注目をおび
ておシ、実用化への努力が種々性われている。In addition, in contrast to coating-type magnetic recording media that have a magnetic layer on a non-magnetic support that has ferromagnetic powder dispersed in an organic binder, which has been widely used as a magnetic recording medium, vacuum evaporation is used to improve recording density. A so-called metal thin film type magnetic recording medium that does not use a binder and has a magnetic recording layer that is a ferromagnetic metal thin film formed by paper deposition such as sputtering or ion blasting, or plating methods such as electroplating or electroless plating. It has also attracted attention, and various efforts are being made to put it into practical use.
しかし強磁性金属薄膜からなる磁気記録媒体Ｋかかわる
大きな問題として、耐候性、走行性、耐摩耗性がある。However, major problems concerning the magnetic recording medium K made of a ferromagnetic metal thin film include weather resistance, runnability, and abrasion resistance.
一般に非常に平滑な表面をもつ金属薄膜型は塗布型磁気
記録媒体よシも更に走行耐久性を持たせることが難しい
。従って走行性、耐久性を向上させる方法として、潤滑
層や保＠層を設けることが検討されてきている。In general, metal thin film type magnetic recording media, which have very smooth surfaces, are difficult to provide running durability compared to coating type magnetic recording media. Therefore, as a method of improving running performance and durability, the provision of a lubricating layer or a retention layer has been considered.
金属型磁気記録媒体の保護層としては、熱可塑性樹脂、
熱硬化性樹脂、脂肪酸、脂肪酸の金属塩、脂肪酸エステ
ル、あるいはアルキル燐酸エステル等を有機溶剤に溶解
して塗布したものがある。As a protective layer for metal magnetic recording media, thermoplastic resin,
There are products in which a thermosetting resin, a fatty acid, a metal salt of a fatty acid, a fatty acid ester, an alkyl phosphate ester, etc. are dissolved in an organic solvent and applied.
（特開昭６０−６りｒコ弘号公報、特開証ｏ−ｒお一７
号公報参照）
〔発明が解決しようとする問題点〕
本発明は、前述した強磁性粉末塗布型の磁気記録媒体に
使用される潤滑剤を改良して十分な走行耐久性が得られ
るようにするものであり、また金属薄膜型磁気記録媒体
の保護層にも有効に用いられる良好な潤滑作用をもつ物
質によシ走行耐久性を高めようとするものである。(Unexamined Japanese Patent Application Publication No. 1986-6 Rikoko No. 7,
(Refer to the above publication) [Problems to be solved by the invention] The present invention improves the lubricant used in the above-mentioned ferromagnetic powder-coated magnetic recording medium so that sufficient running durability can be obtained. It is also an attempt to improve running durability by using a substance with good lubricating action, which is also effectively used in the protective layer of metal thin film type magnetic recording media.
従って、本発明は走行耐久性が改良された強磁性粉末塗
布型、及び金属薄膜型磁気記録媒体を提供することを目
的とする。Accordingly, an object of the present invention is to provide a ferromagnetic powder coated type and metal thin film type magnetic recording medium with improved running durability.
本発明は、下記一般式で示されるピロリドンカルボン酸
エステル化合物の少なくとも１種を磁性層に保持させる
ことを特徴とする磁気記録媒体である。The present invention is a magnetic recording medium characterized in that a magnetic layer holds at least one type of pyrrolidone carboxylic acid ester compound represented by the following general formula.
Ｒ：炭素数ノーココの直鎖または分岐のアルキル基また
はアルケニル基
ｎ；Ｏ〜ＩＯの整数
本発明者らは、磁性層に使用する潤滑剤として有用な化
合物を種々検討した結果、前記ピロリドンカルボン酸エ
ステル化合物を磁性層中に含有させ、又は磁性層上に保
持させた磁気記録媒体においては磁気ヘッド、ガイドポ
ール等の部材との摺動において耐摩耗性が著しく向上す
るとともに、走行系部材に対する摩擦係数が低減される
ことを見出し、本発明をなすに至ったものである。R: linear or branched alkyl group or alkenyl group with no number of carbon atoms n; integer from O to IO The present inventors investigated various compounds useful as lubricants for use in the magnetic layer, and found that the above-mentioned pyrrolidone carboxylic acid In magnetic recording media in which ester compounds are contained in the magnetic layer or held on the magnetic layer, wear resistance is significantly improved when sliding with members such as magnetic heads and guide poles, and friction against traveling system members is improved. It was discovered that the coefficient can be reduced, and this led to the present invention.
本発明をさらに具体的にいえば、非磁性支持体上に強磁
性粉末と結合剤とからなる磁性層を設けた磁気記録媒体
においては、磁性層中に前記化合物を含有させ、又は磁
性層上に前記化合物を含有する層を形成した磁気記録媒
体であシ、また金属薄膜型磁気記録媒体においては、非
磁性支持体上に磁性層として設けた強磁性金属薄膜の表
面上に前記化合物を含む層を形成した磁気記録媒体であ
る。More specifically, in a magnetic recording medium in which a magnetic layer made of ferromagnetic powder and a binder is provided on a non-magnetic support, the above compound is contained in the magnetic layer or on the magnetic layer. In a magnetic recording medium, a layer containing the above compound is formed on the surface of a ferromagnetic metal thin film provided as a magnetic layer on a non-magnetic support. This is a magnetic recording medium with layers formed thereon.
本発明においては、前記一般式で表わされるピロリドン
カルボン酸エステル化合物であれば何でも用いることが
できるが、具体例をあげると以下のようである。In the present invention, any pyrrolidone carboxylic acid ester compound represented by the above general formula can be used, and specific examples are as follows.
ここでｎは直鎖、ｉｓｏは分岐を示す。Here, n indicates a straight chain, and iso indicates a branch.
本発明において前記ピロリドンカルボン酸エステルを存
在させる方法としては主として、強磁性粉末と結合剤か
らなる磁性層を有する磁気記録媒体の場合、■磁性塗料
の中に添加する。■磁性層を形成する前に支持体上に本
発明のエステル化合物を含む層を設ける。■磁性層が形
成されたあとに磁性層表面に本発明のエステル化合物を
トップコートする、等がある。In the present invention, the pyrrolidone carboxylic acid ester is mainly present in the case of a magnetic recording medium having a magnetic layer made of ferromagnetic powder and a binder, by (1) adding it into a magnetic paint. (2) A layer containing the ester compound of the present invention is provided on the support before forming the magnetic layer. (2) After the magnetic layer is formed, the surface of the magnetic layer is top-coated with the ester compound of the present invention.
トップコートの方法としては■適当な有機溶媒にエステ
ル化合物を溶解して塗布乾燥をする方法■エステル化合
物そのものまたはこれを適当な有機溶剤に溶解したもの
を噴霧する方法、または■真空蒸着等の気相法、■有機
溶剤に材料を溶解した溶液に基板を浸漬して材料を基板
表面に吸着させる方法、■ラングミュアー・プロジェッ
ト法等が挙げられる。Top coating methods include: ■ Dissolving the ester compound in an appropriate organic solvent and applying and drying it; ■ Spraying the ester compound itself or a solution of it in an appropriate organic solvent; or ■ Vacuum deposition or other methods. Examples include the phase method, (1) a method in which the substrate is immersed in a solution of a material dissolved in an organic solvent to adsorb the material to the substrate surface, and (2) the Langmuir-Prodgett method.
真空蒸着、スパッター法等によシ形成された強磁性金属
薄膜を磁性層とする磁気記録媒体の場合は主として磁性
層が形成されたあとに磁性層表面に本発明のエステル化
合物をトップコートする方法が用いられる。In the case of a magnetic recording medium whose magnetic layer is a ferromagnetic metal thin film formed by vacuum evaporation, sputtering, etc., the method mainly involves top-coating the surface of the magnetic layer with the ester compound of the present invention after the magnetic layer is formed. is used.
本発明において前記エステル化合物の好ましい使用量範
囲は磁性塗料の中に添加する場合は強磁性粉末に対して
０．２〜μ、０重量％でありより好ましい範囲としては
ｏ、ｒ〜コ、０重量％である。磁性層を形成する前に支
持体上に本発明のエステル化合物を含む層を設ける場合
は１０−２００ｗ／扉２である。In the present invention, the preferred amount range of the ester compound used is 0.2 to μ, 0% by weight based on the ferromagnetic powder when added to a magnetic paint, and the more preferred range is o, r to co, 0. Weight%. When a layer containing the ester compound of the present invention is provided on the support before forming the magnetic layer, the amount is 10-200w/door 2.
金属薄膜型磁気記録媒体にトップコートを設ける場合厚
み（存在量のことをここでは厚みと呼ぶことにする）は
、０ 、”Ｓ’／ｍ２〜／ ００ｎｙ／ｒｎ２が好まし
く、より好ましくはコｗ／ｍ”〜３０■／ｒｎ２である
。厚みがｏ、ｚダ／ｒＩＬ２以下だと均一な膜として形
成するのが困雛であシ、走行性、耐久性が十分でない。When a top coat is provided on a metal thin film type magnetic recording medium, the thickness (the amount present is referred to as thickness here) is preferably 0.00000000000000000000000000000000000000000000 ny/rn2, more preferably from /m''~30■/rn2. If the thickness is less than o,z da/rIL2, it is difficult to form a uniform film, and runnability and durability are insufficient.
また厚みがｉｏｏ■／扉２以上の場合は、ヘッド−テー
プ間のスペーシング損失のため電磁変換特性が劣化する
問題がある。In addition, if the thickness is more than ioo / door 2, there is a problem that electromagnetic conversion characteristics deteriorate due to spacing loss between the head and the tape.
強磁性粉末塗布型磁気記録媒体の場合はトップコート層
として用いる時は／−！００ダ／ ｍ ２の塗布量が好
ましく、よシ好ましくは！〜ｉｚｏダ／ｍ２である。磁
性塗料に内添して使用される量は、強磁性粉末にたいし
、０．０／ｗｔ％〜１０゜０ｗ１％が好ましく、より好
ましくは、ｏ、ｏｒｗｔチ〜Ａｗｔ％である。In the case of a ferromagnetic powder coated magnetic recording medium, when used as a top coat layer, /-! A coating amount of 0.00 Da/m2 is preferred, even more preferred! ~izo da/m2. The amount to be added internally to the magnetic paint is preferably 0.0/wt% to 10°0w1%, more preferably o, orwt% to Awt%, based on the ferromagnetic powder.
強性性粉末塗布型磁気記録媒体にトップコートする場合
、トップコートの時期は■磁性層塗布と同時に重層塗布
する。When applying a top coat to a strong powder-coated magnetic recording medium, the timing of the top coat is: (1) Multilayer coating is performed at the same time as the magnetic layer coating.
■磁性層が塗布された後、完全に乾燥しない時にトップ
コートする。■After the magnetic layer is applied, apply a top coat if it is not completely dry.
■磁性層が乾燥し、成膜したあとにトップコートする。■After the magnetic layer is dried and formed, apply a top coat.
■スーツぞ−カレンダーで表面成形処理後にトップコー
トする。■It's a suit - apply a top coat after surface molding with a calendar.
０表面物理処理後（例えばブレード処理後）Ｋトップコ
ートするなどのタイミングがあるが、いづれの方法でも
効果を発揮することができる。Although there are timings such as applying a K top coat after surface physical treatment (for example, after blade treatment), either method can be effective.
本発明においては、ピロリドンカルボン酸エステル化合
物の他に一般の潤滑剤を混在させてもよい。併用できる
潤滑剤としては、脂肪酸、金属石鹸゛、脂肪酸アミド、
脂肪酸エステル、高級脂肪属アルコール、モノアルキル
７オスフエート、シア 、ルキルフオス７エート、ト
リアルキルフォスフェート、ハラフィン類、シリコーン
オイル、動植物油、鉱油、高級脂肪属アミン；グラファ
イト、シリカ、二硫化モリブデン、二硫化タングステン
等の無機微粉末；ポリエチレン、ポリプロピレン、ポリ
塩化ビニル、エチレン−塩化ビニル共重合体、ポリテト
ラフルオロエチレン等の樹脂粉末；αオレフイン重合物
；常温で液体の不飽和脂肪属炭化水素、フルオロカーボ
ン類等があげられる。In the present invention, a general lubricant may be mixed in addition to the pyrrolidone carboxylic acid ester compound. Lubricants that can be used in combination include fatty acids, metal soaps, fatty acid amides,
Fatty acid esters, higher fatty alcohols, monoalkyl heptophosphates, shea, lukylphous heptaates, trialkyl phosphates, halaffins, silicone oils, animal and vegetable oils, mineral oils, higher fatty amines; graphite, silica, molybdenum disulfide, disulfide Inorganic fine powders such as tungsten; resin powders such as polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl chloride copolymers, and polytetrafluoroethylene; α-olefin polymers; unsaturated aliphatic hydrocarbons and fluorocarbons that are liquid at room temperature etc. can be mentioned.
強磁性粉末塗布型磁気記録媒体の場合使用される強磁性
粉末に特に制限はない。強磁性合金粉末、Ｔ−Ｆｅ２０
３ 、Ｆｅ３Ｏ４ｅｃｏ変性酸化鉄。In the case of a ferromagnetic powder-coated magnetic recording medium, there is no particular restriction on the ferromagnetic powder used. Ferromagnetic alloy powder, T-Fe20
3. Fe3O4eco modified iron oxide.
Ｃｒ ０２の低変性バリウムフェライトおよび変性スト
ロンチウム７エライト等を挙げることができる。Examples include low-modified barium ferrite of Cr 02 and modified strontium 7-elite.
強磁性粉末の形状に特に制限はないが通常は、針状、粒
状、サイコロ状、米粒状および板状のものなどが使用さ
れる。この強磁性粉末の比表面積は、ＩＩ Ｑ ｍ２／
ｇ以上が電磁変換特性上好ましく、更に弘よ、２／ｇ
以上が好ましい。There is no particular restriction on the shape of the ferromagnetic powder, but needle-like, granular, dice-like, rice-grain-like, and plate-like shapes are usually used. The specific surface area of this ferromagnetic powder is II Q m2/
g or more is preferable in terms of electromagnetic conversion characteristics, and moreover, Hiro, 2/g
The above is preferable.
磁性層を形成する結合剤は通常の結合剤から選ぶことが
できる。結合剤の例としては、塩化ビニル・酢酸ビニル
共重合体、塩化ビニル・酢酸ビニルとビニルアルコール
、マレイン酸および／またはアクリル酸との共重合体、
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、エチレン・酢酸ビニル共重合
体、ニトロセルロースなどのセルロース誘導体、アクリ
ル樹脂、ポリビニルアセタール樹脂、ポリビニルブチラ
ール樹脂、エポキシ樹脂、フェノキシ樹脂、ポリウレタ
ン樹脂、ポリカーボネートポリウレタン、ポリエステル
樹脂等を挙げることができる。The binder forming the magnetic layer can be selected from conventional binders. Examples of binders include vinyl chloride/vinyl acetate copolymers, vinyl chloride/vinyl acetate copolymers with vinyl alcohol, maleic acid and/or acrylic acid,
Vinyl chloride/vinylidene chloride copolymer, vinyl chloride/acrylonitrile copolymer, ethylene/vinyl acetate copolymer, cellulose derivatives such as nitrocellulose, acrylic resin, polyvinyl acetal resin, polyvinyl butyral resin, epoxy resin, phenoxy resin, polyurethane Examples include resin, polycarbonate polyurethane, and polyester resin.
又結合剤としては分子中に一８ｏ ３Ｍ 。Also, as a binder, there is 1803M in the molecule.
−ＣＯＯＭ （ここでＭはＨ，Ｌｉ 、Ｎａ ＋Ｋａ
Ｉアミンであり、Ｍ′はＨ＋ Ｌ Ｉ ＋ Ｎ ａ
ｒ Ｋ ａ ＋アルキル基である）等あるいはヒドロキ
シル基、エポキン基、アミノ基等の極性基を持つ共重合
体又は樹脂が、よりすぐれた分散性と塗膜耐久性を与え
る。-COOM (here M is H, Li, Na + Ka
I amine, M' is H+ L I + N a
r K a +alkyl group) or a copolymer or resin having a polar group such as a hydroxyl group, an epoquine group, or an amino group provides better dispersibility and coating durability.
この中でも、−８Ｏ３Ｎａ ＋−ＣＯＯＨ。Among these, -8O3Na + -COOH.
Ｎａ
一０ Ｐ−ＯＮａ、 ＮＨ２基を持つ共重合体又は
樹脂が好ましい。Na 10 P-ONa, a copolymer or resin having NH2 groups is preferred.
本発明の磁気記録媒体の磁性層中の全結合剤の含有量は
、通常は強磁性粉末ｉｏｏ重量部に対して１０〜１００
重量部であり、好ましくは２０〜４！Ｏ部である。The total binder content in the magnetic layer of the magnetic recording medium of the present invention is usually 10 to 100 parts by weight based on ioo parts by weight of the ferromagnetic powder.
parts by weight, preferably 20 to 4! This is part O.
本発明の磁気記録媒体の磁性層に社、さらにモース硬度
！以上の無機質粒子を含有することが好ましい。The magnetic layer of the magnetic recording medium of the present invention has a high hardness and a high Mohs hardness! It is preferable to contain the above inorganic particles.
使用される無機質粒子は、モース硬度が５以上であれば
特に制限はない。モース硬度が５以上の無機質粒子の例
としては、Ａ１２０ａ（モース硬度り）、Ｔｉｅ（同Ａ
）、Ｔｉ０２（同ａ、ｔ）。The inorganic particles used are not particularly limited as long as they have a Mohs hardness of 5 or more. Examples of inorganic particles with a Mohs hardness of 5 or more include A120a (Mohs hardness), Tie (A120a)
), Ti02 (same a, t).
Ｓ ｉ ０２ （同７）、５ｎ０２ （同Ａ、ｊ）。S i 02 (same 7), 5n02 (same A, j).
Ｃｒ２０３（同り）、およびα−Ｆｅ２０３（同！、り
を挙げることができ、これらを単独あるいは混合して用
いることができる。Examples include Cr203 (same) and α-Fe203 (same!), and these can be used alone or in combination.
とくに好ましいのはモース硬度が２以上の無機質粒子で
ある。モース硬度がｊよシも低いような比較的軟らかい
無機質粒子を用いた場合には、磁性層から°無機質粒子
が脱落しやすく、またヘッドの研磨作用も殆どないため
、ヘッド目詰まシを発生しやすく、また走行耐久性も乏
しくなる。Particularly preferred are inorganic particles having a Mohs hardness of 2 or more. When using relatively soft inorganic particles with a Mohs hardness as low as J, the inorganic particles easily fall off from the magnetic layer and have almost no abrasive action on the head, resulting in head clogging. It is easy to run, and the running durability is also poor.
無機質粒子の含有量は、通常、強磁性粉末１００重量部
に対して０．／−２０重量部の範囲であシ、好ましくは
／−１０重量部の範囲である。The content of inorganic particles is usually 0.00 parts by weight per 100 parts by weight of ferromagnetic powder. The range is /-20 parts by weight, preferably /-10 parts by weight.
また磁性層には上記の無機質粒子以外にも、カーボンブ
ラック（特Ｋ、平均粒径が７０〜３００ｍμのもの）な
どを含有させることが望ましい。In addition to the above-mentioned inorganic particles, the magnetic layer preferably contains carbon black (Special K, with an average particle size of 70 to 300 mμ).
つぎに本発明の磁気記録媒体を製造する方法の例を述べ
る。Next, an example of a method for manufacturing the magnetic recording medium of the present invention will be described.
まず、強磁性粉末と結合剤、前記のピロリドンカルボン
酸エステル化合物、そして必要に応じて、他の充填材、
添加剤などを溶剤と混練し、磁性塗料を調製する。混線
の際に使用する溶剤としては、磁性塗料の調製に通常使
用されている溶剤を使用することができる。First, ferromagnetic powder and binder, the above-mentioned pyrrolidone carboxylic acid ester compound, and if necessary, other fillers,
Additives are mixed with a solvent to prepare magnetic paint. As the solvent used in the crosstalk, a solvent commonly used for preparing magnetic paints can be used.
混線の方法にも％に制限はなく、また各成分の添加順序
などは適宜設定することができる。There is no limit to the percentage of the method of mixing, and the order of addition of each component can be set as appropriate.
磁性塗料の調製には通常の混練機、例えば、二本ロール
ミル、三本ロールミル、ホールミル、ペブルミル、トロ
ンミル、サンドグラインダー、ゼグパリ、アトライター
、高速インペラー分散機、高速ストーンミル、高速度衝
撃ミル、ディスパー。For the preparation of magnetic coatings, conventional kneading machines are used, such as two-roll mills, three-roll mills, whole mills, pebble mills, thoron mills, sand grinders, Zegpari, attritor, high-speed impeller dispersion machines, high-speed stone mills, high-speed impact mills, and dispers. .
ニーダ−１高速ミキサー、ホモジナイザーおヨヒ超音波
分散機などを挙げることができる。Examples include a kneader-1 high speed mixer, a homogenizer and an ultrasonic dispersion machine.
磁性塗料を調製する際には、分散剤、帯電防止剤、潤滑
剤等の公知の添加剤を併せて使用することもできる。When preparing a magnetic paint, known additives such as dispersants, antistatic agents, lubricants, etc. can also be used.
分散剤の例としては、炭素数７２〜２λの脂肪酸（例、
カプリル酸、カプリン酸、ラウリン酸、ミリスチン酸、
パルミチン酸、ステアリン酸、ベヘン酸、オレイン酸、
エライジン酸、リノール酸、リルン酸、ステアロール酸
）、上記脂肪酸とアルカリ金属（例、リチウム、ナトリ
ウム、カリウム、バリウム）とからなる金属セッケン、
上記の脂肪酸のエステルおよびその化合物の水素の一部
あるいは全部をフッ素原子で置換した化合物、上記の脂
肪酸のアミド、脂肪属アミン、高級アルコール、ポリア
ルキレンオキサイドアルキル燐酸エステル、アルキル燐
酸エステル、アルキルホウ酸エステル、サルコアネート
類、アルキルエーテルエステル類、トリアルキルポリオ
レフィン、オキシ第μ級アンモニウム塩およびレシチン
などの公知の分散剤を挙げることができる。Examples of dispersants include fatty acids having 72 to 2 λ carbon atoms (e.g.
caprylic acid, capric acid, lauric acid, myristic acid,
palmitic acid, stearic acid, behenic acid, oleic acid,
elaidic acid, linoleic acid, linoleic acid, stearolic acid), a metal soap consisting of the above fatty acids and an alkali metal (e.g. lithium, sodium, potassium, barium),
Esters of the above fatty acids and compounds in which part or all of the hydrogen atoms of the compounds are replaced with fluorine atoms, amides of the above fatty acids, fatty amines, higher alcohols, polyalkylene oxide alkyl phosphates, alkyl phosphates, alkyl borates , sarcoanates, alkyl ether esters, trialkyl polyolefins, oxy-μ class ammonium salts and lecithin.
分散剤を使用する場合は、通常は使用する強磁性粉末ｉ
ｏｏ重量部に対し、０．７〜７０重量部の範囲で使用さ
れる。When using a dispersant, the ferromagnetic powder used is usually
It is used in a range of 0.7 to 70 parts by weight based on 0 parts by weight.
帯電防止剤の例としては、カーボンブラック、カーボン
ブラックグラフトポリマーなどの導電性微粉末；サポニ
ンなどの天然界面活性剤；アルキレンオキサイド系、グ
リセリン系およびグリシドール系などのノニオン系界面
活性剤；高級アルキルアミン類、第≠級アンモニウム塩
類、ピリジンその他の複素環化合物の塩類、ホスホニウ
ムまたハスルホニウム類などのカチオン性界面活性剤：
カルボン酸、燐酸、硫酸エステル基、燐酸エステル基等
の酸性基を含むアニオン性界面活性剤ニアミノ酸類、ア
ミノスルホン酸類、アミノアルコールの硫酸または燐酸
エステル類等の両性界面活性剤等を挙げることができる
。帯電防止剤として上記の導電性微粉末を使用する場合
には、例えば強磁性粉末１００重量部に対し０．７〜Ｉ
Ｏ重量部の範囲で使用され、界面活性剤を使用する場合
にも同様にｏ、ｉ〜ｉｏｚ量部の範囲で使用される。Examples of antistatic agents include conductive fine powders such as carbon black and carbon black graft polymers; natural surfactants such as saponins; nonionic surfactants such as alkylene oxides, glycerins, and glycidols; higher alkyl amines. cationic surfactants such as ≠class ammonium salts, salts of pyridine and other heterocyclic compounds, phosphoniums and hasulfoniums:
Examples include anionic surfactants containing acidic groups such as carboxylic acid, phosphoric acid, sulfuric acid ester groups, and phosphoric ester groups; amphoteric surfactants such as diamino acids, aminosulfonic acids, and sulfuric or phosphoric esters of amino alcohols; . When using the above conductive fine powder as an antistatic agent, for example, 0.7 to I
It is used in the range of 0 parts by weight, and when a surfactant is used, it is similarly used in the range of 0, i to ioz parts by weight.
なお、上述した分散剤、帯電防止剤などの添加剤は、厳
密に上述した作用効果のみを有するものであるとの限定
の下に記載したものではなく、例えば、分散剤が潤滑剤
あるいは帯電防止剤として作用することも有シうる。従
って、上記分類によシ例示した化合物などの効果作用が
、上記分類に記載された事項に限定されないことは勿論
であシ、また複数の作用効果を奏する物質を使用する場
合には、添加量は、その作用効果を考慮して決定するこ
とが好ましい。Note that the above-mentioned additives such as dispersants and antistatic agents are not described with the strict limitation that they have only the effects described above; for example, the dispersant is a lubricant or an antistatic agent. It may also act as an agent. Therefore, it goes without saying that the effects of the compounds exemplified in the above classifications are not limited to those listed in the above classifications, and when using substances that have multiple effects, the amount of is preferably determined by taking into account its effects.
このようにして調製された磁性塗料は前述の非磁性支持
体上に塗布される。塗布は、前記非磁性支持体上に直接
性なうことも可能であるが、ｔた。The magnetic paint thus prepared is applied onto the non-magnetic support described above. Coating can be done directly onto the non-magnetic support, but it is not possible.
接着剤層（下塗層）などを介して非磁性支持体上に塗布
することもできる。It can also be applied onto a non-magnetic support via an adhesive layer (undercoat layer) or the like.
非磁性支持体上への塗布法の例としては、エアードクタ
ーコート、ブレードコート、ロッドコート、押し出しコ
ート、エアナイフコート、スクイズコート、含浸コート
、リバースロールコート、トランスファーロールコート
、クラビアコート、キスコート、キャストコート、スプ
レーコート及びスピンコード法等を挙げることができ、
またこれら以外の方法であっても利用することができる
。Examples of coating methods on non-magnetic supports include air doctor coating, blade coating, rod coating, extrusion coating, air knife coating, squeeze coating, impregnation coating, reverse roll coating, transfer roll coating, clavier coating, kiss coating, and casting. coat, spray coat, spin code method, etc.
Moreover, methods other than these can also be used.
また、上記の強磁性粉末と結合剤の分散方法および支持
体への塗布方法などの詳細は特開昭ｊ４Ｌ−≠ｔｏｉｉ
号および同！弘−２／１０！号等の各公報に記載されて
いる。Further, details of the method of dispersing the above-mentioned ferromagnetic powder and binder and the method of applying it to the support are given in JP-A-4L-≠toii.
No. and same! Hiro - 2/10! It is stated in each publication such as No.
このようにして塗布される磁性層の厚さは、乾燥後の厚
さで一般には約０．ｊ−１０μｍの範囲、通常は／、ｊ
〜７．０μｍの範囲になるよう塗布される。The thickness of the magnetic layer coated in this way is generally about 0.05 mm after drying. j - 10 μm range, usually /, j
It is applied so that the thickness is in the range of ~7.0 μm.
非磁性支持体上に塗布された磁性層は磁気記録媒体がテ
ープ状で使用される場合通常、磁性層中の強磁性粉末を
配向させる処理、即ち磁場配向処理を施したあと、乾燥
される。また必要により表面平滑化処理が施される。When a magnetic recording medium is used in the form of a tape, the magnetic layer coated on the non-magnetic support is usually subjected to a treatment for orienting the ferromagnetic powder in the magnetic layer, that is, a magnetic field orientation treatment, and then dried. Further, a surface smoothing treatment is performed if necessary.
金属薄膜部１磁気記録媒体の場合強磁性金属薄膜の材料
としては鉄、コバルト、ニッケルその他の強磁性金属あ
るいはＦｅ−Ｃｏ 、Ｆｅ−Ｎｉ 、Ｃｏ −Ｎ ｉ＋
Ｆ ｅ−Ｒｈ ｌ Ｃｏ Ｐ ＊ Ｃｏ−Ｂ ＋
Ｃｏ−Ｙ ｇ Ｃ。Metal thin film portion 1 In the case of a magnetic recording medium, the material of the ferromagnetic metal thin film may be iron, cobalt, nickel or other ferromagnetic metals, or Fe-Co, Fe-Ni, Co-Ni+.
F e-Rh l Co P * Co-B +
Co-YgC.
−Ｌａ ＋Ｃｏ−Ｃｅ 、Ｃｏ−Ｐｔ 、Ｃｏ−８ｍ、
Ｃｏ−Ｍｎ＋Ｃｏ−Ｃｒ 、ｌ’ｅ−Ｃｏ−Ｎｉ 、Ｃ
ｏ−Ｎｉ −Ｐ 、Ｃｏ −Ｎｉ−Ｂ、Ｃｏ−Ｎｉ−人
ｇ 、 Ｃｏ−Ｎｉ −Ｎｄ 、Ｃｏ −Ｎ １−Ｃｅ
、 Ｃｏ −Ｎ １−Ｚｎ 、 Ｃｏ−Ｎｉ−Ｃｕ
、 Ｃｏ −Ｎｉ−Ｗ、Ｃｏ−Ｎｉ−Ｒｅ等の強磁性合
金を電気メッキ、無電解メッキ、気相メッキ、スパッタ
リング、蒸着、イオンブレーティング等の方法によシ形
成せしめたもので、その膜厚は磁気記録媒体として使用
する場合０．０２〜λμ島の範囲であシ、特に０．Ｏｊ
〜Ｏ１弘μ落の範囲が望ましい。-La+Co-Ce, Co-Pt, Co-8m,
Co-Mn+Co-Cr, l'e-Co-Ni, C
o-Ni-P, Co-Ni-B, Co-Ni-P, Co-Ni-Nd, Co-N1-Ce
, Co-Ni-Zn, Co-Ni-Cu
, Co-Ni-W, Co-Ni-Re, and other ferromagnetic alloys are formed by methods such as electroplating, electroless plating, vapor phase plating, sputtering, vapor deposition, and ion blating. When used as a magnetic recording medium, the thickness should be in the range of 0.02 to λμ, particularly 0.02 to λμ. Oj
A range of ~O1 hiromu is desirable.
上記の強磁性金属薄膜は他に０．Ｎ、Ｃｒ、Ｃａ。The above ferromagnetic metal thin film also has 0. N, Cr, Ca.
Ａｓ、Ｓｒ＋Ｚｒ＋ＮｂｔＴｅ＋Ｐｍ１Ｒｅ、０ｓｓＩ
ｒ＋ＡｕｔＨｇ＋ＰｂｙＢｉ等を含んでいてもよい。As, Sr+Zr+NbtTe+Pm1Re, 0ssI
r+AutHg+PbyBi, etc. may be included.
上記の強磁性金属薄膜層の表面形状は特に規定されない
が、ｉｏ〜１ｏｏｏ＾の高さの突起を有している場合特
に走行性・耐久性に優れる。Although the surface shape of the above-mentioned ferromagnetic metal thin film layer is not particularly specified, when it has protrusions with a height of io to 1 ooo^, it is particularly excellent in runnability and durability.
支持体の厚さは参〜６０μｍが好ましい。また強磁性金
属薄膜の密着向上・磁気特性改良のために支持体上に下
地層を設けてもよい。The thickness of the support is preferably about 60 μm. Further, an underlayer may be provided on the support to improve the adhesion and magnetic properties of the ferromagnetic metal thin film.
本発明の磁気記録媒体は優れた電磁変換特性を示す媒体
であり、例えばビデオテープとして使用した場合には高
い再生出力を示す。さらに、ビデオテープとしてはステ
ルライフが長く良好な走行耐久性を示し、さらに広範囲
の温湿度条件下で低い摩擦係数を示し、また磁気ヘッド
の目詰まりを引き起こしにくいとの利点がある。また、
フロッピーディスクとしても、高出力、高耐久性の著し
い効果を示す。The magnetic recording medium of the present invention is a medium that exhibits excellent electromagnetic conversion characteristics, and exhibits high playback output when used as a video tape, for example. Further, as a videotape, it has a long steal life, exhibits good running durability, exhibits a low coefficient of friction under a wide range of temperature and humidity conditions, and has the advantage of being less likely to cause clogging of the magnetic head. Also,
As a floppy disk, it also exhibits remarkable effects of high output and high durability.
〔実施例〕
次に、本発明の実施例及び比較例を示す。なお、実施例
中の「部」との表示は「重量部」を示すものとする。[Example] Next, Examples and Comparative Examples of the present invention will be shown. Note that "parts" in the examples indicate "parts by weight."
〔実施例１〕
下記の組成物をボールミルを用いて弘ｒ時間混線分散し
たあと、これにポリインシアネー）ｊ部を加え、さらに
７時間混線分散したあと、１μｍの平均孔径を有するフ
ィルタを用いてろ過し、磁性塗料を調製した。得られた
磁性塗料を乾燥後の厚さが弘、０μｍになるように、厚
さ１０μｍのポリエチレンテレフタレート支持体の表面
にリバースロールを用いて塗布した。[Example 1] After cross-dispersing the following composition for a long time using a ball mill, add part (polyincyane) to this, cross-dispersing for another 7 hours, and then filtering using a filter having an average pore size of 1 μm. Then, a magnetic paint was prepared. The obtained magnetic paint was applied onto the surface of a polyethylene terephthalate support having a thickness of 10 μm using a reverse roll so that the thickness after drying was 0 μm.
磁性塗料組成 強磁性合金粉末（組成：Ｆｅり弘チ。Magnetic paint composition Ferromagnetic alloy powder (composition: Ferihirochi.
Ｚｎ４’％、Ｎｉ−２％；抗磁カニ ／ｊ０００ｅ ；
比表面積ｊ部ダ／ｍ２）
ｉｏｏ部
塩化ビニル／酢酸ビニル／無水マレ
イン酸共重合体（日本ゼオン■製４ｔＯＯＸ／１０１、
重合度≠００）
７２部
ポリエステル系ポリウレタン（開環
系、縮重合系ポリエステルを併せ含有、平均分子量ルア
、／分子当υ平均λ個の８０３ Ｎ ａを持つ、数平均
分子量コ、ｊ万）
７０部
研磨材（α−アルミナ、平均粒径３μｍ）ｊ部
ピロリドンカルボン酸エステルをはじめとする潤滑剤（
第１表記載）
ステアリン酸 ７部カーボン
ブラック（平均粒径≠０μｍ） ２部メチルエチルケ
トン ３００部非磁性支持体上に磁性塗
料を塗布し、磁性塗料が未乾燥の状態で３０００ガウス
の磁石で磁場配向を行ない、さらに乾燥後、スーパーカ
レンダー処理を行なった後、１ｍ幅にスリットして、１
ｍビデオテープを製造した。（第１表）
〔実施例２〕
下記の組成物をボールミルを用いて４ｔｔ時間混線分散
した後、これにポリインシアネート！部ヲ加え、さらに
１時間混線分散したあと、ｌμ島の平均孔径を有するフ
ィルターを用いてろ過し、磁性塗料を調製した。得られ
た磁性塗料を乾燥後の厚さが≠、Ｏμｍになるように、
厚さ７０μ罵のポリエチレンテレフタレート支持体の表
面にリバースロールを用いて塗布した。Zn4'%, Ni-2%; anti-magnetic crab /j000e;
Specific surface area j part da/m2) ioo part Vinyl chloride/vinyl acetate/maleic anhydride copolymer (4tOOX/101 manufactured by Nippon Zeon ■)
Degree of polymerization ≠ 00) 72 parts polyester polyurethane (contains both ring-opening polyester and polycondensation polyester, has an average molecular weight of 803 N a / υ average λ per molecule, number average molecular weight ko, j million) 70 Part: Abrasive material (α-alumina, average particle size 3 μm) Part: Lubricant (including pyrrolidone carboxylic acid ester)
Listed in Table 1) Stearic acid 7 parts Carbon black (average particle size ≠ 0 μm) 2 parts Methyl ethyl ketone 300 parts Magnetic paint was applied on a non-magnetic support, and while the magnetic paint was not dry, it was oriented in a magnetic field using a 3000 Gauss magnet. After further drying and super calendering, slits are made into 1m wide pieces.
m videotape was produced. (Table 1) [Example 2] The following composition was cross-dispersed for 4tt using a ball mill, and then polyincyanate was added to it! After 1 hour of cross-dispersion, the mixture was filtered using a filter having an average pore size of lμ to prepare a magnetic paint. The obtained magnetic paint was dried so that the thickness after drying was ≠ O μm.
The coating was applied onto the surface of a polyethylene terephthalate support having a thickness of 70 μm using a reverse roll.
磁性塗料組成 強磁性合金粉末（組成：Ｆｅ９≠チ。Magnetic paint composition Ferromagnetic alloy powder (composition: Fe9≠Chi.
Ｚｎ４’％、Ｎｉｕ％；抗磁カニ１ｊｏｏｏｅ：比ｆｉ
面ｆ＊ ｊ ４’ ｗ／ｍ２）
ｉｏｏ部
塩化ビニル／酢酸ビニル／無水マレ
イン酸共重合体（日本ゼオン■製弘ｏｏＸｉｉｏＡ、重
合度弘００）
７２部
ポリエステル系ポリウレタン（開環
系、縮重合系ポリエステルを併せ持つ。重量平均分子量
参万、／分子量り平均２個のＳ ０３ Ｎ ａをもつ、
数平均分子量λ、！万）
ｊ部
無機質粒子（α−アルミナ、平均粒径０．２μｍ）ｊ部
ステアリン酸 ７部カーボン
ブラック（平均粒径≠０ｒｒＬμ） ２部メチルエチル
ケト７ ３００部非磁性支持体上に磁性塗
料を塗布し、未乾燥の状態で３０００ガウスの磁石で磁
場配向を行なった。さらに乾燥し、スーパーカレンダー
処理を行なった後パーコーターを用い第２表に記載の潤
滑剤を有機溶媒に溶解してトップコートした。乾燥後１
ｍ幅にスリットしてＩｔｓビデオテープを製造した。Zn4'%, Niu%; anti-magnetic crab 1jooooe: ratio fi
Surface f* j 4' w/m2) Ioo part Vinyl chloride/vinyl acetate/maleic anhydride copolymer (Nippon Zeon Corporation KooXiioA, degree of polymerization 00) 72 parts Polyester polyurethane (ring-opening type, condensation polymerization type Contains polyester.Has a weight average molecular weight of 10,000/molecular weight and an average of 2 S03N a.
Number average molecular weight λ,! 10,000 parts) J part inorganic particles (α-alumina, average particle size 0.2 μm) J part Stearic acid 7 parts Carbon black (average particle size ≠ 0rrL μ) 2 parts Methyl ethyl keto 7 300 parts Magnetic paint was applied on a non-magnetic support. , magnetic field orientation was performed using a 3000 Gauss magnet in an undried state. After further drying and supercalender treatment, the lubricant listed in Table 2 was dissolved in an organic solvent and top coated using a percoater. After drying 1
Its videotape was produced by slitting it into m width.
上記のようにして得られたビデオテープにＶＴＲ（富士
写真フィルム■：ＦＵＪＩＸ−ｒ）を用いて７ Ｍ Ｈ
ｚの信号を記録し、再生した。基準テープ（比較例／）
に記録した７ Ｍ Ｈｚの再生出力をＯｄＢとしたとき
のビデオテープの相対的な再生出力を測定した。その後
間ＶＴＲで２！ｒ０ｃ、１０％ＲＨ環境下で６０分長を
２００回走行させた後の再生出力を初期再生出力と比較
し、「出力低下」のデータとした。The video tape obtained as described above was recorded at 7 MH by using a VTR (Fuji Photo Film ■: FUJIX-r).
The z signal was recorded and played back. Standard tape (comparative example/)
The relative playback output of the videotape was measured when the playback output of 7 MHz recorded on the video tape was set as OdB. 2 on the VTR afterwards! The playback output after running 200 times for 60 minutes in an r0c, 10% RH environment was compared with the initial playback output, and was taken as "output reduction" data.
得られたビデオテープとステンレスポールとをｚｏＨの
張力（Ｔ１）で接触（巻きつけ角ｉｒｏ”）させて、こ
の条件下で、ビデオテープをＪ、Ｊｃｍ／ｓｅｃの速度
で走行させるのに必要な張力（Ｔ２）を測定した。この
測定値をもとに、下記計算式によシビデオテープの、摩
擦係数μをもとめた。The obtained videotape and a stainless steel pole are brought into contact (wrapping angle iro") with a tension of zoH (T1), and under this condition, the amount necessary to run the videotape at a speed of J, Jcm/sec is The tension (T2) was measured. Based on this measured value, the friction coefficient μ of the videotape was determined using the following calculation formula.
（第１表および第２表に記載）
μ＝／／π−Ｉｎ（Ｔｚ／Ｔｔ）
尚、摩擦係数のテストは、コ３°Ｃ１７ｏ％ＲＨの条件
で行なった。(Listed in Tables 1 and 2) μ=//π-In (Tz/Tt) The friction coefficient test was conducted at 3°C and 17o% RH.
第１表および第２表の結果より明白な如く、本発明のピ
ロリドンカルボン酸エステル化合物による潤滑剤を用い
た実施例１〜／／はいずれも再生出力が高く、走行性、
耐久性が優れることがわかる。As is clear from the results in Tables 1 and 2, all of Examples 1 to // using the lubricant made of the pyrrolidone carboxylic acid ester compound of the present invention had high regeneration output, running properties,
It can be seen that the durability is excellent.
一方、本発明の化合物を使用せず、脂肪酸や脂肪エステ
ルのみを用いた場合は、再生出力の向上効果は認められ
ず、又摩擦係数が大きく耐久性にも問題があることがわ
かる。On the other hand, when the compound of the present invention is not used and only fatty acids or fatty esters are used, no improvement in reproduction output is observed, and it is also found that the coefficient of friction is large and there are problems in durability.
Claims (1)
、下記一般式で示されるピロリドンカルボン酸エステル
化合物の少なくとも一種を磁性層中に含有又は磁性層上
に保持してなることを特徴とする磁気記録媒体。 ▲数式、化学式、表等があります▼ Ｒ；炭素数１〜２２の直鎖又は分岐のアルキル基または
アルケニル基 ｎ；０〜１０の整数[Scope of Claims] A magnetic recording medium having a magnetic layer provided on a non-magnetic support, in which at least one pyrrolidone carboxylic acid ester compound represented by the following general formula is contained in the magnetic layer or held on the magnetic layer. A magnetic recording medium characterized by: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ R: Straight chain or branched alkyl group or alkenyl group having 1 to 22 carbon atoms n: An integer from 0 to 10
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62090446A JPS63255818A (en) | 1987-04-13 | 1987-04-13 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62090446A JPS63255818A (en) | 1987-04-13 | 1987-04-13 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63255818A true JPS63255818A (en) | 1988-10-24 |
Family
ID=13998845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62090446A Pending JPS63255818A (en) | 1987-04-13 | 1987-04-13 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63255818A (en) |
-
1987
- 1987-04-13 JP JP62090446A patent/JPS63255818A/en active Pending
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