JPS62217421A - Magnetic recording medium having iron carbide-containing magnetic layer - Google Patents
Magnetic recording medium having iron carbide-containing magnetic layerInfo
- Publication number
- JPS62217421A JPS62217421A JP61061197A JP6119786A JPS62217421A JP S62217421 A JPS62217421 A JP S62217421A JP 61061197 A JP61061197 A JP 61061197A JP 6119786 A JP6119786 A JP 6119786A JP S62217421 A JPS62217421 A JP S62217421A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- iron carbide
- recording medium
- 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
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- 239000003302 ferromagnetic material Substances 0.000 claims abstract description 4
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
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- 239000005639 Lauric acid Substances 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
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- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
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- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
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- 239000002904 solvent Substances 0.000 description 2
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- DZKDPOPGYFUOGI-UHFFFAOYSA-N tungsten(iv) oxide Chemical compound O=[W]=O DZKDPOPGYFUOGI-UHFFFAOYSA-N 0.000 description 2
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- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- HXDLWJWIAHWIKI-UHFFFAOYSA-N 2-hydroxyethyl acetate Chemical compound CC(=O)OCCO HXDLWJWIAHWIKI-UHFFFAOYSA-N 0.000 description 1
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
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- DNAWGBOKUFFVMB-ANYFDBNWSA-N C1C[C@@H](O)[C@@H]2C(COC(=O)[C@](O)([C@H](C)O)C(C)C)=CC[N+]21[O-] Chemical compound C1C[C@@H](O)[C@@H]2C(COC(=O)[C@](O)([C@H](C)O)C(C)C)=CC[N+]21[O-] DNAWGBOKUFFVMB-ANYFDBNWSA-N 0.000 description 1
- 239000005997 Calcium carbide Substances 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 229910020517 Co—Ti Inorganic materials 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
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- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
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- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は導電性、遮光性及び再生出力の大軽い磁気記録
媒体に関する。The present invention relates to a magnetic recording medium that is electrically conductive, has light shielding properties, and has a large reproduction output.
従来よりγ−Ｆｅ２Ｏ３、ｃｏ−γＦｅ２Ｏ３等が磁性
粉としで常用されてきた。そして最近は、より高Ｓ／Ｎ
化の為に、それらの粒子径はより微小になってきた。
またより高密度記録を求めて口ａ７ヱライトや金属粉も
用いられるようになってきた。
一方特開昭６０−１２４０２３号で見られるように炭化
鉄を主体とする磁性粉も提案されている。
また磁気記録媒体（以後単に媒体と称することがある）
には帯電防止、光に対する隠蔽力（遮光性）増大のため
にカーボンブラックを多量に用いている。
γ−Ｆｅ２０’、、Ｃｏ被着−γＦｅ２Ｏ＋、１）ａ７
ｚライト等は導電性また光の隠蔽力が低く、これらを用
いた媒体は帯電しやすく光透過率も高いものであるのみ
ならず近来進められている微粒化はよりその性向を強め
るものである。そこで一般に帯電防止剤や透過率を低下
させる遮光剤が加えられ、その両者の役割を果たすもの
として通常はカーボンブラックが一般に用いられる。し
かし多量のカーボンブラックの使用は媒体中での磁性粉
の割合を減少させ結局は再生出力を大きく低下させる。
一方炭化鉄が多量に磁性層に含まれる時は導電性や遮光
性では良好であり、またＣｏ−γＦｅ２Ｏ，より高いＢ
ａ＋も期待で外る。しかし炭化鉄調製は針状の酸化鉄や
オキシ水酸化鉄の炭化によるため炭化鉄を多量に用いる
媒体は通常の酸化鉄磁性粉を用いた媒体に比ベコストが
高くまたノイズレベルもやや高くなりがちである。また
磁気ヘッドの摩耗も大きくなり不都合を生じる。
また一方金属粉を用いる場合においても、その化学的安
定性を増すために一般にその表面に緻密な酸化被膜が作
られ、さらに微粒子化も重なり媒体磁性層の導電性は低
いものである。Conventionally, γ-Fe2O3, co-γFe2O3, etc. have been commonly used as magnetic powder. And recently, higher S/N
Because of this, their particle sizes have become smaller. Furthermore, in pursuit of higher density recording, a7elite and metal powder have also come to be used. On the other hand, magnetic powder mainly composed of iron carbide has also been proposed, as seen in JP-A-60-124023. Also, magnetic recording media (hereinafter sometimes simply referred to as media)
A large amount of carbon black is used to prevent static electricity and increase light shielding power. γ-Fe20', Co deposited-γFe2O+, 1) a7
Z-lights and the like have low conductivity and light hiding power, and media using them are not only easy to charge and have high light transmittance, but the recent progress in atomization has further strengthened this tendency. . Therefore, an antistatic agent and a light shielding agent that lowers the transmittance are generally added, and carbon black is generally used as an agent that plays both roles. However, the use of a large amount of carbon black reduces the proportion of magnetic powder in the medium, resulting in a significant reduction in reproduction output. On the other hand, when a large amount of iron carbide is contained in the magnetic layer, the conductivity and light shielding properties are good, and Co-γFe2O, higher B
A+ is also disappointing. However, since iron carbide preparation involves carbonization of acicular iron oxide or iron oxyhydroxide, media that use a large amount of iron carbide tend to have a higher cost and a slightly higher noise level than media that use normal iron oxide magnetic powder. It is. Furthermore, the wear of the magnetic head increases, causing inconvenience. On the other hand, even when metal powder is used, a dense oxide film is generally formed on its surface to increase its chemical stability, and the particles are also made finer, so that the conductivity of the medium magnetic layer is low.
本発明の目的は、帯電防止性能及び遮光性のよい且つ画
像再生出力の大きな磁気記録媒体の提供にある。An object of the present invention is to provide a magnetic recording medium that has good antistatic performance and light shielding properties, and has a large image reproduction output.
前記本発明の目的は、非磁性支持体上に強磁性体及び結
合剤を含む磁性層を設けた磁気記録媒体に於て、該磁性
層体積中に炭化鉄を１．５〜１５ｖｏＮ％含むことを特
徴とする磁気記録媒体によって達成される。
次に本発明の詳細な説明する。
γＦｅ２Ｏ３、Ｃｏ被着γＦｅ２Ｏ３、Ｂａ７ｚライト
等は磁性体として常用されるものであるが、Ｂａ７エラ
イト、ｃｏ−γＦｅ２Ｏ３等において表面抵抗を１０９
Ω／ｃｍ２以下かつ波長９００ｎｍの光透過率を磁性層
厚４μ艶で０．１％以下におさえるためには磁性層中に
カーボンブラックを多量に加える必要があり、その量は
磁性粉、カーボンブラック、結合剤等により異なるが、
磁性層中に体積で５〜１５ｖｏＮ％を占有する。
一方磁性粉は媒体磁性層中に３０〜５０ｖｏｆｆｉ％で
あるので、このカーボンブラックを磁性粉に置とがえる
事により、がなりの出力増が期待できる。本発明はこれ
に炭化鉄を当てる事により帯電や光透過率の問題も同時
に解消したものである。しかも同程度の体積含有率では
通常のカーボンブラックより少ない量で帯電や光透過率
に寄与するのでコスト面でも問題は少ない。
また磁性粉の一部を炭化鉄に置きかえ出力域を惹起する
ことなくカーボンブラックを減少することにより結合剤
の割合を増すことが可能であるので上り高耐へ性の媒体
を得る事を可能とする。
本発明に於て炭化鉄を磁性層中に含有させる割合は体積
で１．５％以上更に２％以上が望ましい。
−力率発明の範囲を越えて多く含有させる場合には上記
目的は満足されるけれども、前記した欠点を生じ、また
実用的には１５ｖｏｌ％よりさらに含有率を増しても、
はとんど特性上変わらずコストばかり高くなる。従って
、炭化鉄の磁性層中の含有率は実効を奏する１、５〜１
５ｖｏＮ％、更に望ましくは２〜１５ｖｏＮ％である。
この比率は磁気テープ、磁気ディスク等によって変わる
ことはない。
ここで炭化鉄はＦｅｎＣであられされ（ｎ≧２）主とし
てＦｅ５Ｃ２、その他Ｆｅ２．）Ｏｇ、Ｆｅ＝Ｃ５Ｆｅ
２Ｃ等も含有される。また鉄の他に、一部Ｃｏ、旧、＾
Ｌ Ｚｒ５ＣｒｓＳｉ等他の元素の混入もあり得るもの
である。
本発明に於て炭化鉄と併用される磁性材料としては、例
えばγ−Ｆｅ２０．．、Ｃｏ含含有−Ｆｅ２０．、Ｃｏ
被被着−Ｆｅ２０−１Ｆｅ３０ｓ、Ｃｏ含有Ｆｅ３Ｏ４
、Ｃｏ被着Ｆｅ＊Ｏ＜、ＣｒＯ２等の酸化物磁性体、例
えばＦｅ、旧、Ｃｏ、 Ｆｅ−Ｎｉ合金、Ｆｅ−Ｃｏ合
金、Ｆｅ−Ｎ１−Ｐ合金、Ｆｅ−Ｎｉ−Ｃｏ合金、Ｆｅ
−Ｈｎ−Ｚｎ合金、Ｆｅ−Ｎｉ−Ｚｎ合金、Ｆｅ−Ｃｏ
旧−Ｃｒ合金、Ｆｅ−Ｃｏ−Ｎ１−Ｐ合金、Ｃｏ−旧合
金、Ｃｏ−Ｐ合金、Ｃｏ−Ｃｒ合金等Ｆｅ、旧、Ｃｏを
主成分とするメタル磁性粉等各４一
種の強磁性体が挙げられる。
これらの金属磁性体に対する添加物としては５ｉｘＣｕ
、 Ｚｎ、＾ＩＳＰ、 Ｍｎ、 Ｃｒ等の元素又はこれ
らの化合物が含まれていても良い。またバリウムフェラ
イト等の六方晶系フェライト、窒化鉄も使用される。
本発明の磁性層もしくはバックコート層等に用いられる
結合剤（バインダー）としては、耐摩耗性のあるポリウ
レタンが挙げられる。これは、他の物質に対する接着力
が強く、反復して加わる応力または屈曲に耐えて機械的
に強靭であり、且つ耐摩耗性、耐候性が良好である。
またポリウレタンの他に、繊維素系樹脂及び塩化ビニル
系共重合体も含有せしめれば、磁性層中の磁性粉の分散
性が向上してその機械的強度が増大する。但し繊維素系
樹脂及び塩化ビニル系共重合体のみでは層が硬くなりす
ぎるが、これは上述のポリウレタンの含有によって防止
できる。
使用可能な繊維素系樹脂には、セルロースエーテル、セ
ルロース無慨酸エステル、セルロース有槻酸エステル等
が使用できる。上記の塩化ビニル系共重合体は、部分的
に加水分解されていてもよい。塩化ビニル系共重合体と
して、好ましくは、塩化ビニル−酢酸ビニルを含んだ共
重合体が挙げられる。
またフェノキシ樹脂も使用することができる。
フェノキシ樹脂は機械的強度が大きく、寸度安定性にす
ぐれ、耐熱、耐水、耐薬品性がよく、接着性がよい等の
長所を有する。
これらの長所は前記したポリウレタンと長短相補い更に
相助けてテープ物性に於て経時安定性を着しく高めるこ
とができる。
更に前記したバインダーの他、一般に磁気記録媒体に用
いられる樹脂、或は親木基等による各種変性樹脂、或は
挙動に特徴のある熱可塑性樹脂、熱硬化性樹脂、反応型
樹脂、電子線照射硬化型樹脂との混合物が使用されても
よい。
本発明の磁気テープの磁性層の耐久性を向上させるため
に磁性塗料に各種硬化剤を含有させることができ、例え
ばイソシアネートを含有させることができる。
使用できる芳香族インシアネートは、例えばトリレンジ
イソシアネート （ＴＤＩ）等及びこれらインシアネー
トと活性水素化合物との付加体などがあり、平均分子量
としては１００〜３，０００の範囲のものが好適である
。
また脂肪族インシアネートとしては、ヘキサメチレンジ
イソシアネー） （）ＩＮＤＩ）等及びこれらイソシ
アネートと活性水素化合物の付加体等が挙げられる。こ
れらの脂肪族インシアネート及びこれらインシアネート
と活性水素化合物の付加体などの中でも、好ましいのは
分子量が１００〜３，０００の範囲のものである。脂肪
族イソシアネートのなかでも非脂環式のインシアネート
及びこれら化合物と活性水素化合物の付加体が好ましい
。
上記磁性層を形成するのに使用される磁性塗料には必要
に応じて分散剤、滑面剤、研磨剤、マット剤、更にカー
ボンブラック帯電防止剤等の添加剤を含有させてもよい
。
分散剤としては、レシチン、リン酸エステル、アミン化
合物、アルキルサルフェート、脂肪酸アミド、高級アル
コール、ポリエチレンオキサイド、スルホコハク酸、ス
ルホコハク酸エステル、公知の界面活性剤等及びこれら
の塩があり、また、陰性有機基（例えば−Ｃ００■、−
ＰＯ２旧を有する重合体分散剤の塩を使用することも出
来る。これら分散剤は１種類のみで用いても、或は２種
類以上を併用してもよい。これらの分散剤はバインダー
１００重量部に対し１〜２０重量部の範囲で添加される
。これらの分散剤は、あらかじめ磁性粉を前処理する為
に用いてもよい。
また、滑面剤としては、シリコーンオイル、グラファイ
ト、カーボンブラックグフ７トボリマー、二硫化モリブ
デン、二酸化タングステン、ラウリル酸、ミリスチン酸
、炭素原子数１２〜１６の一塩基性脂肪酸と該脂肪酸の
炭素原子数と合計して炭素原子数が２１〜２３個の一価
のアルコールから成る脂肪酸エステル（いわゆるロウ）
等も使用できる。
これらの滑面剤は結合剤１００重量部に対して０．２〜
２０重量部の範囲で添加される。
研磨剤としては、一般に使用される材料で鎧融アルミナ
、炭化ケイ素、酸化クロム、コランダム、人造コランダ
ム、ダイヤモンド、人造ダイヤモンド、ザクロ石、エメ
リー （主成分：コランダムと磁鉄鉱）等が使用される
。これらの研磨剤は平均粒子径０．０５〜５μ鎗の大き
さのものが使用され、特に好ましくは０．１〜２μｍで
ある。これらの研磨剤は結合剤１００重量部に対して１
〜２０重量部の範囲で添加される。
マット剤としては、有機質粉末或は無機質粉末を夫々に
或は混合して用いられる。
本発明に用いられる有機質粉末としては、アクリルスチ
レン系樹脂、ベンゾグアナミン系樹脂粉末、メラミン系
樹脂粉末、７タロシアニン系顔料が好ましいが、ポリオ
レフィン系樹脂粉末、ポリエステル系樹脂粉末、ポリア
ミド系樹脂粉末、ポリイミド系樹脂粉末、ポリ７フ化エ
チレン樹脂粉末等も使用で外、無機質粉末としては酸化
珪素、酸化チタン、酸化アルミニウム、炭酸カルシウム
、硫酸バリウム、酸化亜鉛、酸化錫、酸化アルミニラム
、酸化クロム、炭化珪素、炭化カルシウム、α−Ｆｅ２
０ｓ、タルク、カオリン、硫酸カルシウム、窒化硼素、
弗化亜鉛、二酸化モリブデンが挙げられる。
使用してもよい帯電防止剤としては、前記カーボンブラ
ックをはじめ、グラファイト、酸化スズ−酸化アンチモ
ン系化合物、酸化チタン−酸化スズ−酸化アンチモン系
化合物などの導電性粉末；−−などがあげられる。
上記塗料に配合される溶媒或はこの塗料の塗布時の希釈
溶媒としては、アセトン、メチルエチルケトン、メチル
イソブチルケトン、シクロヘキサノン等のケトン類；メ
タノール、エタノール、プロパツール、ブタノール等の
アルコール類；酢酸メチル、酢酸エチル、酢酸ブチル、
乳酸エチル、エチレングリコールモノアセテート等のエ
ステル類；グリコールジメチルエーテル、グリコールモ
ノエチルエーテル、ジオキサン、テトラヒドロ７ラン等
のエーテル類；ベンゼン、トルエン、キシレン等の芳香
族炭化水素；メチレンクロライド、エチレンクロライド
、四塩化炭素、クロロホルム、ジクロルベンゼン等のハ
ロゲン化炭化水素等のものが使用できる。
また、支持体としては、ポリエチレンテレフタレート、
ポリエチレン−２，６−す７タレート等のポリエステル
類、ポリプロピ１／ン等のポリオレフィン類、セルロー
ストリアセテート、セルロースグイアセテート等のセル
ロース誘導体、ポリアミド、ポリカーボネートなどのプ
ラスチックが挙げられるが、Ｃｕ、＾り、Ｚｎ等の金属
、ガラス、ＢＮ。
Ｓｉカーバイド、磁器、陶器等のセラミックなども使用
できる。
これらの支持体の厚みはフィルム、シート状の場合は約
３〜１００μＩＩＩ程度、好ましくは５〜５０μｍであ
り、ディスク、カード状の場合は３０μｍ〜１０＋ｏＩ
ｆｉ程度であり、ドラム状の場合は円筒状で用ν１られ
、使用するレコーダに応じてその型は決められる。
上記支持体と磁性層の中間には接着性を向上させる中間
層を設けても良い。
支持体上に上記磁性層を形成するための塗布方法として
は、エアードクターコート、ブレードコート、エアーナ
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７アーロールコート、グラビアコ
ート、キスコート、キャストコート、スプレィコート等
が利用できるがこれらに限らない。The object of the present invention is to provide a magnetic recording medium in which a magnetic layer containing a ferromagnetic material and a binder is provided on a non-magnetic support, in which the volume of the magnetic layer contains 1.5 to 15 voN% of iron carbide. This is achieved by a magnetic recording medium characterized by: Next, the present invention will be explained in detail. γFe2O3, Co-coated γFe2O3, Ba7z light, etc. are commonly used as magnetic materials, but Ba7 elite, co-γFe2O3, etc. have a surface resistance of 109
In order to keep the light transmittance below Ω/cm2 and at a wavelength of 900 nm below 0.1% with a magnetic layer thickness of 4 μm, it is necessary to add a large amount of carbon black to the magnetic layer. , differs depending on the binder etc.
It occupies 5 to 15 voN% by volume in the magnetic layer. On the other hand, since the magnetic powder is 30 to 50 voffi% in the medium magnetic layer, by replacing this carbon black with the magnetic powder, a significant increase in output can be expected. The present invention solves the problems of charging and light transmittance at the same time by applying iron carbide to this material. Furthermore, at the same volume content, carbon black contributes to charging and light transmittance in a smaller amount than ordinary carbon black, so there are fewer problems in terms of cost. In addition, it is possible to increase the proportion of binder by replacing part of the magnetic powder with iron carbide and reducing the amount of carbon black without causing an increase in the output range, making it possible to obtain a medium with high upstream resistance. do. In the present invention, the proportion of iron carbide contained in the magnetic layer is preferably 1.5% or more and more preferably 2% or more by volume. - If the power factor is increased beyond the range of the invention, the above objective is satisfied, but the above-mentioned drawbacks occur, and in practice, even if the content is increased beyond 15 vol%,
However, the characteristics remain the same and the cost is higher. Therefore, the content of iron carbide in the magnetic layer is 1,5 to 1, which is effective.
It is 5 voN%, more preferably 2 to 15 voN%. This ratio does not change depending on the magnetic tape, magnetic disk, etc. Here, the iron carbide is composed of FenC (n≧2), mainly Fe5C2, and other Fe2. )Og, Fe=C5Fe
It also contains 2C and the like. In addition to iron, some Co, old, ^
It is also possible that other elements such as LZr5CrsSi are mixed. In the present invention, examples of magnetic materials used in combination with iron carbide include γ-Fe20. ．． , Co-containing-Fe20. ,Co
Adhering - Fe20-1Fe30s, Co-containing Fe3O4
, Co-coated Fe*O<, CrO2 and other oxide magnetic materials, such as Fe, old Co, Fe-Ni alloy, Fe-Co alloy, Fe-N1-P alloy, Fe-Ni-Co alloy, Fe
-Hn-Zn alloy, Fe-Ni-Zn alloy, Fe-Co
Old-Cr alloy, Fe-Co-N1-P alloy, Co-old alloy, Co-P alloy, Co-Cr alloy, etc. Four types of ferromagnetic materials each including metal magnetic powders whose main components are Fe, old, and Co. can be mentioned. As an additive to these metal magnetic materials, 5ixCu
, Zn, ISP, Mn, Cr, or a compound thereof may be included. Hexagonal ferrite such as barium ferrite and iron nitride are also used. The binder used in the magnetic layer, back coat layer, etc. of the present invention includes abrasion-resistant polyurethane. It has strong adhesion to other substances, is mechanically strong to withstand repeated stress or bending, and has good abrasion resistance and weather resistance. Furthermore, if a cellulose resin and a vinyl chloride copolymer are also contained in addition to polyurethane, the dispersibility of the magnetic powder in the magnetic layer will be improved and its mechanical strength will be increased. However, if only the cellulose resin and the vinyl chloride copolymer are used, the layer becomes too hard, but this can be prevented by containing the above-mentioned polyurethane. Usable cellulose resins include cellulose ether, cellulose inspirinate ester, and cellulose peroxide ester. The vinyl chloride copolymer described above may be partially hydrolyzed. Preferable examples of the vinyl chloride copolymer include copolymers containing vinyl chloride and vinyl acetate. Phenoxy resins can also be used. Phenoxy resin has advantages such as high mechanical strength, excellent dimensional stability, good heat resistance, water resistance, chemical resistance, and good adhesiveness. These advantages are complementary to the above-mentioned polyurethane, and also help to significantly improve the stability over time of the tape's physical properties. In addition to the binders mentioned above, resins generally used in magnetic recording media, various modified resins such as parent wood groups, thermoplastic resins with characteristic behavior, thermosetting resins, reactive resins, and electron beam irradiation resins can be used. Mixtures with curable resins may also be used. In order to improve the durability of the magnetic layer of the magnetic tape of the present invention, the magnetic paint can contain various curing agents, for example, isocyanate. Aromatic incyanates that can be used include, for example, tolylene diisocyanate (TDI) and adducts of these incyanates and active hydrogen compounds, and those having an average molecular weight of 100 to 3,000 are preferred. Examples of aliphatic incyanates include hexamethylene diisocyanate ()INDI) and adducts of these isocyanates with active hydrogen compounds. Among these aliphatic incyanates and adducts of these incyanates and active hydrogen compounds, those having a molecular weight in the range of 100 to 3,000 are preferred. Among the aliphatic isocyanates, non-alicyclic incyanates and adducts of these compounds with active hydrogen compounds are preferred. The magnetic paint used to form the above-mentioned magnetic layer may contain additives such as a dispersant, a lubricant, an abrasive, a matting agent, and a carbon black antistatic agent, if necessary. Examples of dispersants include lecithin, phosphoric acid esters, amine compounds, alkyl sulfates, fatty acid amides, higher alcohols, polyethylene oxides, sulfosuccinic acids, sulfosuccinic acid esters, known surfactants, and salts thereof. groups (e.g. -C00■, -
Salts of polymeric dispersants with PO2 old can also be used. These dispersants may be used alone or in combination of two or more. These dispersants are added in an amount of 1 to 20 parts by weight per 100 parts by weight of the binder. These dispersants may be used to pre-treat the magnetic powder in advance. In addition, as lubricating agents, silicone oil, graphite, carbon black gouf 7 tobolimer, molybdenum disulfide, tungsten dioxide, lauric acid, myristic acid, monobasic fatty acids with 12 to 16 carbon atoms and carbon atoms of the fatty acids are used. and fatty acid esters (so-called waxes) consisting of monohydric alcohols having a total of 21 to 23 carbon atoms.
etc. can also be used. These lubricants are used in an amount of 0.2 to 100 parts by weight of the binder.
It is added in an amount of 20 parts by weight. Commonly used abrasive materials include alumina, silicon carbide, chromium oxide, corundum, artificial corundum, diamond, artificial diamond, garnet, and emery (main ingredients: corundum and magnetite). These abrasives have an average particle diameter of 0.05 to 5 .mu.m, particularly preferably 0.1 to 2 .mu.m. These abrasives are used in an amount of 1 part by weight per 100 parts by weight of the binder.
It is added in a range of 20 parts by weight. As the matting agent, organic powder or inorganic powder may be used individually or in combination. As the organic powder used in the present invention, acrylic styrene resin powder, benzoguanamine resin powder, melamine resin powder, and 7-thalocyanine pigment are preferable, but polyolefin resin powder, polyester resin powder, polyamide resin powder, and polyimide resin powder are preferable. Resin powder, poly7fluoroethylene resin powder, etc. can also be used, and inorganic powders include silicon oxide, titanium oxide, aluminum oxide, calcium carbonate, barium sulfate, zinc oxide, tin oxide, aluminum oxide, chromium oxide, silicon carbide, Calcium carbide, α-Fe2
0s, talc, kaolin, calcium sulfate, boron nitride,
Examples include zinc fluoride and molybdenum dioxide. Examples of the antistatic agent that may be used include the carbon black described above, as well as conductive powders such as graphite, tin oxide-antimony oxide compounds, and titanium oxide-tin oxide-antimony oxide compounds. Solvents to be added to the above paint or diluting solvents during application of this paint include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohols such as methanol, ethanol, propatool, and butanol; methyl acetate, ethyl acetate, butyl acetate,
Esters such as ethyl lactate and ethylene glycol monoacetate; Ethers such as glycol dimethyl ether, glycol monoethyl ether, dioxane, and tetrahydro-7rane; Aromatic hydrocarbons such as benzene, toluene, and xylene; Methylene chloride, ethylene chloride, and tetrachloride Carbon, chloroform, halogenated hydrocarbons such as dichlorobenzene, etc. can be used. In addition, as a support, polyethylene terephthalate,
Examples include polyesters such as polyethylene-2,6-7-talate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate and cellulose guiacetate, and plastics such as polyamide and polycarbonate. Metals such as Zn, glass, BN. Ceramics such as Si carbide, porcelain, and earthenware can also be used. The thickness of these supports is approximately 3 to 100 μm in the case of a film or sheet, preferably 5 to 50 μm, and 30 μm to 10+ oI in the case of a disk or card.
fi, and in the case of a drum shape, a cylindrical shape is used, and the type is determined depending on the recorder used. An intermediate layer for improving adhesiveness may be provided between the support and the magnetic layer. Coating methods for forming the magnetic layer on the support include air doctor coating, blade coating, air knife coating, squeeze coating, impregnation coating, reverse roll coating, trans7 roll coating, gravure coating, kiss coating, and casting. Coat, spray coat, etc. can be used, but are not limited to these.
本発明を実施例を用いて具体的に説明する。
実施例１
下記混合割合で磁性塗料を調製した
磁性粉 １００重量部アルミ
ナ ５ 〃”塩化ビニル−酢
酸ビニル共重合体 １１〃ポリウレタン
１１〃レシチン
３ 〃ラウリン酸 １．５〃
ブチルステアレート １．０〃ミフ０
へ１寸ノン ｔｏｏ ・・メ？ ｎ
ｙｓ、；１し’１ ）−ン
’ｙｏ −この塗料にＴＤＩ系インシアネート
４重量部を添加しポリエチレンテレフタレート （ＰＥ
Ｔ）上に４．４μｍの乾燥膜厚となるよう塗布し、配向
乾燥後平滑化処理をしだ後１２．６５ｍＬＱにスリット
した。
その際用いられた磁性粉は以下のものである。
Ｃｏ−γＦｅｚＯａ （保磁力（Ｉｌｃ） ６６００ｅ
：飽和磁化（σ５）７７ｅ鎮ｕ／ｇｓ ロＥＴイ直３
５＋ｎ”／ｇ）炭化鉄 （）ｌｃ ７０００ ｅ、
（ｆ ｓ９８ｅｍｕ／Ｈ，ＤＥＴ値４（Ｉｎ２／Ｈ）
この時の炭化鉄はＸ線回折により主成分はＦｅ５Ｃ２と
同定された。この２種の磁性粉混合割合を変えて表１に
示すような炭化鉄の含有率を持つ１Ａ−
−７の７種の磁気テープを得た。
表１
試料１−７は、上記割合に加えカーボンブラック （Ｂ
ＥＴ値２２０ｍ２７ｇ 吸油量１１５ｃｃ／１００ｇ
）を体積含有率７ ｖｏｌ％となるように添加した。
結果を表２に示す。ここで磁器特性はＶＳＭ （束英工
業製）にて測定された。また再生出力はＶＩＩＳデツキ
で測定した。光透過率は９００ ｎ ｍの波長光で表２
＊再生出力基準
実施例２
下記の混合割合で磁性塗料と調製した。
磁性粉 １００重量部アルミ
ナ ５ 〃塩化ビニルー酢
酸ビニル共重合体 ９ 〃ボリウレ・タン
９ 〃レシチン
３ 〃ミリスチン酸
１．５〃ブチルステアレート
１．０〃ミ ２ ℃コ ヘカヒ吋ｒ ノ ン
ＨｏＯ″メチルニテ
ルゲトン’７゜ 、。
ヒｌし２ン ９０ リ
この塗料にＴＤＩ系イジイソシアネート３重量部を添乾
燥し平滑化処理後１２．６５ｍｍにスリットした。この
時磁場配向けされていない。
この時用いられた磁性粉は以下のものである。
・Ｃｏ−Ｔｉ置換型Ｂａフェライト （Ｈｅ ９０００
ｅ、 σｓ ５８ｅｍｕ／ｇ直径０．０６μｍ、
厚み０．０２μｍ）
・炭化鉄（）ＩＣ９２００ｅ、ａ ｓ １００＋＋＋ｕ
／ｇ ＢＥＴ値４２ＩＩ＋２７ｇ）この炭化鉄もよたＸ
ｉ回折により主成分はＦｅ５Ｃ２と同定された。
この２種の磁性粉の混合割合を変えて表３に示す炭化鉄
の含有率を持つ試料２−１〜２−６の磁気表３
試料２−６は上記例会に加えカーボンブラック（ＢＥＴ
値２２０ｍ２／ｇ吸油Ｒ１１５ｃｃ／］、ＯＯｇ）を体
積含有率１０ｖｏＮ％となるように添加した。
結果を表４に示す。
再生出力は試料２−６を基準とした波長０．７５゛、−
ノ′
表４
以上のように炭化鉄を帯電防止及び遮光性増大を目的と
して添加した場合、カーボンブラックを用いた時より良
い結果が得られ且つ再生出力も高いものが得られた。The present invention will be specifically explained using examples. Example 1 Magnetic powder prepared with the following mixing ratio: 100 parts by weight Alumina 5 Vinyl chloride-vinyl acetate copolymer 11 Polyurethane
11〃Lecithin
3 Lauric acid 1.5
Butyl stearate 1.0 Mif 0
1 inch non too... me? n
ys, ;1'1)-n
'yo - 4 parts by weight of TDI incyanate was added to this paint and polyethylene terephthalate (PE
It was coated onto T) to have a dry film thickness of 4.4 μm, and after orientation drying and smoothing treatment, it was slit into 12.65 mLQ. The magnetic powder used at that time was as follows. Co-γFezOa (coercive force (Ilc) 6600e
:Saturation magnetization (σ5) 77e Chin u/gs RoET I straight 3
5+n”/g) Iron carbide () lc 7000 e,
(f s98emu/H, DET value 4 (In2/H) The main component of the iron carbide at this time was identified as Fe5C2 by X-ray diffraction. By changing the mixing ratio of these two types of magnetic powder, Seven types of magnetic tapes 1A--7 with iron carbide content were obtained. Table 1 Sample 1-7 contained carbon black (B
ET value 220m27g Oil absorption 115cc/100g
) was added at a volume content of 7 vol%. The results are shown in Table 2. Here, the porcelain properties were measured using VSM (manufactured by Shuei Kogyo). Furthermore, the reproduction output was measured using a VIIS deck. The light transmittance was measured at a wavelength of 900 nm in Table 2. *Reproduction output standard Example 2 A magnetic paint was prepared in the following mixing ratio. Magnetic powder 100 parts by weight Alumina 5 Vinyl chloride-vinyl acetate copolymer 9 Polyurethane
9 Lecithin
3 Myristic acid
1.5 Butyl stearate
1.0〃mi 2 ℃ko hekahi 吋r non
3 parts by weight of TDI diisocyanate was added to this paint and dried, and after smoothing, it was slit to 12.65 mm. At this time, the magnetic field was not oriented. The magnetic powder used at this time was as follows: Co-Ti substituted Ba ferrite (He 9000
e, σs 58emu/g diameter 0.06μm, thickness 0.02μm) ・Iron carbide () IC9200e, a s 100+++u
/g BET value 42II + 27g) This iron carbide moyota
The main component was identified as Fe5C2 by i-diffraction. Magnetic Table 3 of Samples 2-1 to 2-6 with the iron carbide content shown in Table 3 by changing the mixing ratio of these two types of magnetic powder.
Value 220 m2/g oil absorption R115 cc/], OOg) was added so that the volume content was 10 voN%. The results are shown in Table 4. The reproduction output is at a wavelength of 0.75゛, - based on sample 2-6.
Table 4 As shown above, when iron carbide was added for the purpose of preventing static electricity and increasing light-shielding properties, better results and higher reproduction output were obtained than when carbon black was used.
Claims (1)
けた磁気記録媒体において、該磁性層体積中に炭化鉄を
１．５〜１５ｖｏｌ％含むことを特徴とする磁気記録媒
体。A magnetic recording medium comprising a magnetic layer containing a ferromagnetic material and a binder on a non-magnetic support, characterized in that the volume of the magnetic layer contains 1.5 to 15 vol% of iron carbide.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61061197A JPS62217421A (en) | 1986-03-17 | 1986-03-17 | Magnetic recording medium having iron carbide-containing magnetic layer |
| US06/913,954 US4748080A (en) | 1985-10-08 | 1986-10-01 | Magnetic recording medium containing iron carbide |
| DE19863634283 DE3634283A1 (en) | 1985-10-08 | 1986-10-08 | IRON CARBIDE CONTAINING MAGNETIC RECORDING MEDIUM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61061197A JPS62217421A (en) | 1986-03-17 | 1986-03-17 | Magnetic recording medium having iron carbide-containing magnetic layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62217421A true JPS62217421A (en) | 1987-09-24 |
Family
ID=13164208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61061197A Pending JPS62217421A (en) | 1985-10-08 | 1986-03-17 | Magnetic recording medium having iron carbide-containing magnetic layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62217421A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60124023A (en) * | 1983-12-07 | 1985-07-02 | Daikin Ind Ltd | Magnetic recording medium |
| JPS60211625A (en) * | 1984-04-05 | 1985-10-24 | Tdk Corp | Magnetic recording medium |
| JPS6286531A (en) * | 1985-10-12 | 1987-04-21 | Tdk Corp | Magnetic sheet |
-
1986
- 1986-03-17 JP JP61061197A patent/JPS62217421A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60124023A (en) * | 1983-12-07 | 1985-07-02 | Daikin Ind Ltd | Magnetic recording medium |
| JPS60211625A (en) * | 1984-04-05 | 1985-10-24 | Tdk Corp | Magnetic recording medium |
| JPS6286531A (en) * | 1985-10-12 | 1987-04-21 | Tdk Corp | Magnetic sheet |
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