JPS6383916A - Magnetic recording medium and its producton - Google Patents
Magnetic recording medium and its productonInfo
- Publication number
- JPS6383916A JPS6383916A JP61228440A JP22844086A JPS6383916A JP S6383916 A JPS6383916 A JP S6383916A JP 61228440 A JP61228440 A JP 61228440A JP 22844086 A JP22844086 A JP 22844086A JP S6383916 A JPS6383916 A JP S6383916A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- ferromagnetic powder
- recording medium
- binder
- 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 88
- 239000000843 powder Substances 0.000 claims abstract description 43
- -1 guanomine Chemical compound 0.000 claims abstract description 23
- 239000001257 hydrogen Substances 0.000 claims abstract description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000005294 ferromagnetic effect Effects 0.000 claims description 43
- 239000011230 binding agent Substances 0.000 claims description 25
- 238000000576 coating method Methods 0.000 claims description 11
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- 239000006185 dispersion Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- UYTPUPDQBNUYGX-UHFFFAOYSA-N guanine Chemical compound O=C1NC(N)=NC2=C1N=CN2 UYTPUPDQBNUYGX-UHFFFAOYSA-N 0.000 abstract description 4
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 abstract description 2
- YEDUAINPPJYDJZ-UHFFFAOYSA-N 2-hydroxybenzothiazole Chemical compound C1=CC=C2SC(O)=NC2=C1 YEDUAINPPJYDJZ-UHFFFAOYSA-N 0.000 abstract description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 abstract description 2
- 239000012964 benzotriazole Substances 0.000 abstract description 2
- ASSKVPFEZFQQNQ-UHFFFAOYSA-N 2-benzoxazolinone Chemical compound C1=CC=C2OC(O)=NC2=C1 ASSKVPFEZFQQNQ-UHFFFAOYSA-N 0.000 abstract 2
- 239000003302 ferromagnetic material Substances 0.000 abstract 2
- QLDQYRDCPNBPII-UHFFFAOYSA-N 1,2-benzoxazol-3-one Chemical compound C1=CC=C2C(O)=NOC2=C1 QLDQYRDCPNBPII-UHFFFAOYSA-N 0.000 abstract 1
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- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- ZQPPMHVWECSIRJ-MDZDMXLPSA-N elaidic acid Chemical compound CCCCCCCC\C=C\CCCCCCCC(O)=O ZQPPMHVWECSIRJ-MDZDMXLPSA-N 0.000 description 2
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- 230000003313 weakening effect Effects 0.000 description 2
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical group OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 1
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- CTKINSOISVBQLD-UHFFFAOYSA-N Glycidol Chemical compound OCC1CO1 CTKINSOISVBQLD-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
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- 241000679125 Thoron Species 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
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- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 description 1
- 235000020661 alpha-linolenic acid Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229940116226 behenic acid Drugs 0.000 description 1
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- DCSRPHQBFSYJNN-UHFFFAOYSA-L disodium 4-[(2-arsonophenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonate Chemical compound [Na+].[Na+].Oc1c(N=Nc2ccccc2[As](O)(O)=O)c2ccc(cc2cc1S([O-])(=O)=O)S([O-])(=O)=O DCSRPHQBFSYJNN-UHFFFAOYSA-L 0.000 description 1
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- 229960002446 octanoic acid Drugs 0.000 description 1
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Landscapes
- 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〕
本発明け、非磁性支持体の一面または両面に強磁性体粉
末と結合剤とを含む磁性層を設けた磁気記録媒体および
その製造方法に関し、特に結合剤への強磁性体粉末の分
散状態が良い磁気記録媒体およびその製造方法に関する
。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording medium in which a magnetic layer containing ferromagnetic powder and a binder is provided on one or both sides of a non-magnetic support, and a method for manufacturing the same. In particular, the present invention relates to a magnetic recording medium in which ferromagnetic powder is well dispersed in a binder, and a method for manufacturing the same.
磁気記録媒体においては、より高密度記録の要求が高ま
り、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 higher density recording, and it is known that one way to solve this problem is to smooth the surface of the magnetic layer.
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、あるいけ磁性層が剥離する傾向がある。However, when the surface of the magnetic layer is smoothed, 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 can be damaged after short-term use, resulting in some damage. The magnetic layer tends to peel off.
時にビデオテープではスチ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り、このような条件下で使用
した場合、時に磁性層から強磁性粉末が脱落し易く、磁
気ヘッドの目詰まりの原因ともなる。Sometimes, in video tapes, the magnetic layer is placed under harsh conditions, such as in still mode, and when used under such conditions, ferromagnetic powder tends to fall off from the magnetic layer, which can lead to clogging of the magnetic head. It can also be a cause.
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、磁性層にフランダム、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、研磨材を相当多量に添加し
なければその添加効果が現れにくい。Conventionally, methods of adding abrasives (hard particles) such as flundum, silicon carbide, and chromium oxide to the magnetic layer have 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 running durability, the effect of the addition is unlikely to appear unless the abrasive is added in a fairly large amount.
しかし、研磨材を多量に添加した磁性層は、磁気ヘッド
彦どを著しく摩耗させる原因となり、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
となど好ましい方法であるとは言えない。However, a magnetic layer with a large amount of abrasive added causes significant wear on the magnetic head, and also goes against the purpose of smoothing the magnetic layer and improving electromagnetic conversion characteristics, so it is not a desirable method. I can't say that.
また脂肪酸ヤ、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種々
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
られているようが潤滑剤では十分では々かった。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 expected conditions, but as is known in the past, lubricants are not sufficient. won.
特に、ビデオテープ訃よびフロッピーディスクにおいて
は、記録波長の短波長化、トラック幅の圧縮による記録
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体粉末より強磁性合金粉末がよく用
いられるようになり、強磁性体粉末の大きさも、より小
さいものが用いられるようになってきた。In particular, in video tapes and floppy disks, as the recording wavelength becomes shorter and the size of recording media becomes smaller due to the compression of track width, the magnetic material is becoming more compact than the conventional iron oxide-based ferromagnetic powder. Ferromagnetic alloy powders have come into widespread use, and ferromagnetic powders of smaller size have also come to be used.
このような急激々強磁性体粒子の微小化により電磁変換
特性は比較的優れたものが得られるが、同時に走行耐久
性を向上させることは難しかった。Although such rapid miniaturization of ferromagnetic particles allows relatively excellent electromagnetic conversion characteristics to be obtained, it has been difficult to simultaneously improve running durability.
そして、強磁性体粒子を用いて非磁性支持体の面上に磁
性層を形成するさいには、強磁性体粒子そのままでは結
合力がないために通常結合剤を使用して支持体に結合さ
せているが、そのさいには強磁性体粉末を結合剤と混合
分散し、その混合物を支持体面上に塗布することなどに
より磁性層を形成していた。そして、その混合分散の状
態は形成される磁性層の物性や磁気特性にかなりの影響
を与えるものである。When forming a magnetic layer on the surface of a non-magnetic support using ferromagnetic particles, a binder is usually used to bond the ferromagnetic particles to the support because the ferromagnetic particles themselves do not have binding force. However, in this case, a magnetic layer was formed by mixing and dispersing ferromagnetic powder with a binder and coating the mixture on the support surface. The state of mixing and dispersion has a considerable influence on the physical properties and magnetic properties of the formed magnetic layer.
上記により微小化された強磁性体粉末を結合剤と混合し
てその中に分散させるさいには、粒子が微小なために粒
子が結合剤中に分散するのに混合時間をかなり要する。When the ferromagnetic powder miniaturized as described above is mixed with a binder and dispersed therein, it takes a considerable amount of mixing time for the particles to be dispersed in the binder because the particles are so small.
分散が十分でないと良い表面性、角型比をとるのが難し
い。If the dispersion is insufficient, it is difficult to obtain good surface properties and squareness ratio.
そこで、結合剤として使用される物質(化合物)に極性
基を導入することにより分散を助長させる手段が考えら
れたが(特開昭54−151417号公報)、この手段
によると分散性はそれほど向上せず、限界があり、また
そのさい磁性層が脆くなるという欠点があった。別の手
段として、強磁性体粒子の表面をカルボン酸およびシア
ンカップリング剤によって処理した後、結合剤中に分散
させる方法が提案されたが(特開昭60−170029
号公報)、この方法でも分散性はそれほど向上せず、反
面結合剤を可塑化する欠点を有するものであった。Therefore, a method of promoting dispersion by introducing a polar group into the substance (compound) used as a binder was considered (Japanese Patent Application Laid-Open No. 151417/1983), but this method did not improve dispersion much. However, it has its limitations, and also has the disadvantage that the magnetic layer becomes brittle. As another method, a method has been proposed in which the surface of ferromagnetic particles is treated with a carboxylic acid and a cyan coupling agent and then dispersed in a binder (Japanese Patent Application Laid-Open No. 170029-1982).
However, this method did not significantly improve the dispersibility, but had the disadvantage of plasticizing the binder.
このため、欠点を伴うことなく強磁性体粒子を結合剤中
に十分分散させる手段を開発することが必要であった。Therefore, it was necessary to develop a means for sufficiently dispersing ferromagnetic particles in a binder without disadvantages.
そこで、従来の技術における欠点を伴うことなく強磁性
体粒子を結合剤中に分散させることができる手段を種々
研究した結果、本発明に到達したものである。Therefore, as a result of research into various means by which ferromagnetic particles can be dispersed in a binder without the drawbacks of the conventional techniques, the present invention was arrived at.
本発明の磁気記録媒体は、非磁性支持体の一面または両
面に強磁性体粉末と結合剤とを含む磁性層を設けてなる
磁気記録媒体において、該磁性層中にpKa (10の
活性水素をもつ含窒素ヘテロ環化合物を含有することを
特徴とする磁気記録媒体である。The magnetic recording medium of the present invention is a magnetic recording medium comprising a magnetic layer containing ferromagnetic powder and a binder on one or both surfaces of a non-magnetic support, in which active hydrogen with a pKa (10) is added to the magnetic layer. This is a magnetic recording medium characterized by containing a nitrogen-containing heterocyclic compound.
また、このa気記録媒体を製造するための手段は、強磁
性体粉末にpxa(1oの活性水素をもつ含窒素ヘテロ
環化合物を被覆させた後、結合剤中に分散させ、その分
散物により非磁性支持体の一面または両面に強磁性体粉
末を含有する磁性層を形成することを特徴とする磁気記
録媒体の製造方法である。In addition, the means for producing this a-air recording medium is to coat a ferromagnetic powder with pxa (a nitrogen-containing heterocyclic compound having 1o active hydrogen), and then disperse it in a binder. This is a method for manufacturing a magnetic recording medium, characterized by forming a magnetic layer containing ferromagnetic powder on one or both surfaces of a nonmagnetic support.
本発明で使用する非磁性支持体は、通常使用されている
ものを用いることができる。As the nonmagnetic support used in the present invention, commonly used nonmagnetic supports can be used.
非磁性支持体を形成する素材の例としては、ポリエチレ
ンテレフタレート、ポリプロピレン、ポリカーボネート
、ポリエチレンナフタレート、ポリアミド、ポリアミド
イミド、ポリイミド等の各稽合成樹脂フィルム、および
アルミ箔、ステンレス箔などの金属箔を挙げることがで
きる。また、非磁性支持体の厚さは一般には3〜50μ
m1好ましくは5〜30μmである。Examples of materials forming the non-magnetic support include various synthetic resin films such as polyethylene terephthalate, polypropylene, polycarbonate, polyethylene naphthalate, polyamide, polyamideimide, and polyimide, and metal foils such as aluminum foil and stainless steel foil. be able to. In addition, the thickness of the non-magnetic support is generally 3 to 50 μm.
m1 is preferably 5 to 30 μm.
非磁性支持体は、磁性層が設けられていない側にバック
WI(バッキング層)が設けられたものであってもよい
。The nonmagnetic support may be provided with a back WI (backing layer) on the side where the magnetic layer is not provided.
本発明で使用される強磁性体粉末には特に制限はない。There are no particular limitations on the ferromagnetic powder used in the present invention.
(1) y −FslOs 、、 (2) Fe104
、(3) (υ〜(2)の中間酸化物(ベルトライド
)、(41(!o ’lドープした(11〜(3)、(
5)Oot=被着した(13〜(3)、(6) Or
0H1(7)金属もしくは合金(いわゆるメタル)、(
8)六方晶フエレイト等を挙げることができるが、この
中でも(5) −(8)が好ましい。(1) y -FslOs , (2) Fe104
, (3) intermediate oxide (bertolide) of (υ~(2), (41(!o 'l doped (11~(3), (
5) Oot=adhered (13-(3), (6) Or
0H1(7) Metal or alloy (so-called metal), (
8) Examples include hexagonal ferrite, among which (5) to (8) are preferred.
強磁性体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、25 m”/
f以上が電磁変換特性上好ましい。There is no particular restriction on the shape of the ferromagnetic powder, but it is usually acicular,
Granular, dice-shaped, rice grain-shaped and plate-shaped ones are used. The specific surface area of this ferromagnetic powder is 25 m”/
f or more is preferable in terms of electromagnetic conversion characteristics.
磁性層を形成する結合剤は通常磁気記録媒体で使用され
る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、ポリ
ウレタン樹脂、ポリカーボネートポリウレタン樹脂等を
挙げることができる。The binder forming the magnetic layer can be selected from binders commonly used in magnetic recording media. Examples of binders include:
Vinyl chloride/vinyl acetate copolymer, vinyl chloride, copolymer of vinyl acetate and vinyl alcohol, maleic acid and/or acrylic acid, vinyl chloride/vinylidene chloride copolymer, vinyl chloride/acrylonitrile copolymer, polyurethane resin , polycarbonate polyurethane resin, and the like.
これらの結合剤は単独にまたは混合して用いても良く、
使用量は強磁性体粉末の10〜40 wt%、好ましく
け15〜30 wt%である。These binders may be used alone or in combination,
The amount used is 10 to 40 wt%, preferably 15 to 30 wt% of the ferromagnetic powder.
磁性層に含有させるpKa (10の活性水素をもつ含
窒素ヘテロ環化合物で用いられているpKaは、物理化
学で定義されているとおり、pKa =−1ogt。The pKa contained in the magnetic layer (The pKa used in the nitrogen-containing heterocyclic compound having 10 active hydrogens is pKa = -1ogt as defined in physical chemistry.
Ka であり、とのKaは次のように定義さり、る。Ka is defined as follows.
ここで、HA :該化合物を活性水素に着目して表現し
たもの
y :活量係数(y彪は胆について
の活量係数)
そして、pKa (10の活性水素をもつ含窒素ヘテロ
環化合物の例としてはベンゾイミダゾール、ベンゾトリ
アゾール、グアニン、グアノミン、ベンゾオキサシロン
、ベンゾイソオキサシロン、ベンゾチアゾロン等が挙げ
られる。Here, HA: Expression of the compound focusing on active hydrogen y: Activity coefficient (y Biao is the activity coefficient for bile) and pKa (Example of nitrogen-containing heterocyclic compound with 10 active hydrogens) Examples include benzimidazole, benzotriazole, guanine, guanomine, benzoxacilone, benzisoxacilone, benzothiazolone and the like.
前記化合物の使用量は、強磁性体粉末に対してQ、05
〜5wt%の量が効果があり、[lL05wt%以下で
は分散が十分性われず、5wt%以上では磁性層の脆弱
化などの欠点が出てしまう。The amount of the compound used is Q, 05 for the ferromagnetic powder.
An amount of ~5 wt% is effective; if the amount is less than 5 wt%, the dispersion will not be sufficient, and if it is more than 5 wt%, disadvantages such as weakening of the magnetic layer will occur.
前記化合物を磁性層に含有させるための添加の仕方につ
いては、強磁性体粉末の表面処理による方法と混合物な
どへの添加による方法などがあり、表面処理方法では前
記化合物を含有させた溶媒中に強磁性粉末を浸漬し、必
要により混合、かくはんし、その後溶媒を揮発などによ
り除去することにより、前記化合物を強磁性体粉末の表
面に被覆させるもので、このように処理し九強磁性体粉
末を結合剤中に分散させ、その混合物を用いて磁性層を
形成する。この方法では前記化合物が強磁性体粉末上に
均一に存在するために強磁性体粉末の分散をきわめて良
好にするものであって、好ましい方法である。添加によ
る方法では、強磁性粉末と結合剤との混合分散の前に前
記両物質のいずれかへ前記化合物を添加してもよいし、
また混合分散中に前記化合物を添加してもよいし、ある
いは両段階でそれぞれ添加してもよい。There are two ways to add the compound to the magnetic layer, including a method by surface treatment of ferromagnetic powder and a method by adding it to a mixture. In the surface treatment method, the compound is added to a solvent containing the compound. The compound is coated on the surface of the ferromagnetic powder by immersing the ferromagnetic powder, mixing and stirring if necessary, and then removing the solvent by volatilization. is dispersed in a binder and the mixture is used to form a magnetic layer. In this method, the compound is uniformly present on the ferromagnetic powder, so that the ferromagnetic powder can be dispersed very well, and is therefore a preferred method. In the addition method, the compound may be added to either of the two substances before mixing and dispersing the ferromagnetic powder and the binder;
Further, the above compound may be added during mixing and dispersion, or may be added at both stages.
本発明の磁気記録媒体の磁性層には、さらにモース硬度
5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 preferably further contains inorganic particles having a Mohs hardness of 5 or more.
使用される無機質粒子は、モース硬度が5以上であれば
特に制限はかい。モース硬度が5以上の無機質粒子の例
としては、ム40s (モース硬度9)。There are no particular restrictions on the inorganic particles used as long as they have a Mohs hardness of 5 or more. An example of inorganic particles having a Mohs hardness of 5 or more is Mu40s (Mohs hardness 9).
Tio (同6)、T1o!(同&5)、日10!(同
7)、8nO1(同& 5 ) 、(!r103 (同
9)、およびα−FeBo3(同s、s )6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。Tio (6th), T1o! (same & 5), day 10! (Same 7), 8nO1 (Same & 5), (!r103 (Same 9), and α-FeBo3 (Same s, s) 6), and these can be used alone or in combination.
とくに好ましいのはモース硬度が8以上の無機質粒子で
るる。モース硬度が5より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pt−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 8 or more. When relatively soft inorganic particles with a Mohs hardness of less than 5 are used, the inorganic particles tend to fall off from the magnetic layer and have almost no abrasive action on the head.
Head clogging pt- tends to occur and running durability becomes poor.
無機質粒子の含有′ikは、通常、強磁性粉末100重
量部に対して111〜20重量部の範囲でメジ、好まし
くは1〜10重量部の範囲である。The content of the inorganic particles is usually in the range of 111 to 20 parts by weight, preferably in the range of 1 to 10 parts by weight, based on 100 parts by weight of the ferromagnetic powder.
ま念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(特に、平均粒径が10〜30Onm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 (particularly one having an average particle size of 10 to 30 Onm).
つぎに、本発廚の磁気記録媒体を製造する工程を説明す
る。Next, the process of manufacturing the magnetic recording medium of this invention will be explained.
まず、強磁性体粉末と結合剤、pKaく10以下の活性
水素をもつ含窒素ヘテロ環化合物、そして必要に応じて
他の充填材、添加剤々どを溶剤と混練し、混合物(これ
を以下「磁性塗料」という)を調製する。そのさい、前
記含窒素ヘテロ環化合物は混線に当って添加することな
く、前述したように表面処理方法によってあらかじめ強
磁性体粉末に被覆させておいてもよい。混練の際に使用
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, a ferromagnetic powder, a binder, a nitrogen-containing heterocyclic compound having an active hydrogen with a pKa of 10 or less, and other fillers and additives as necessary are kneaded with a solvent to form a mixture (hereinafter referred to as (referred to as "magnetic paint"). In this case, the nitrogen-containing heterocyclic compound may be coated on the ferromagnetic powder in advance by the surface treatment method as described above, without being added at the time of crosstalk. As the solvent used during kneading, solvents commonly used for preparing magnetic paints can be used.
混線の方法にも特に制限はなく、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 particular restriction on the method of cross-talk, 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線機、例えば、二本ロール
ミル、三本ロールミル、ボールミル、ペブルミル、トロ
ンミル、サンドグラインダー、ゼグバリアトライター、
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、ニーダ−1高速ミキサー、ホモジナ
イザーおよび超音波分散機などを挙げることができる。For the preparation of magnetic paints, conventional mixing machines such as two-roll mills, three-roll mills, ball mills, pebble mills, thoron mills, sand grinders, Zegvariator lighters,
Mention may be made of high speed impeller dispersers, high speed stone mills, high speed impact mills, dispersers, kneader-1 high speed mixers, homogenizers and ultrasonic dispersers.
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12〜22の脂肪酸(91
、カプリル酸、カプリン酸、ラウリン酸、ミリスチン酸
、パルミリン酸、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、リノレン酸、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走化合物、上記
の脂肪酸のアミド、脂肪族アミン、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、サルコキシ
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4級アンモニ9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 12 to 22 carbon atoms (91
, caprylic acid, capric acid, lauric acid, myristic acid, palmyric acid, stearic acid, behenic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, stearolic acid), the above fatty acids and alkali metals (e.g. lithium, sodium , potassium, barium), esters of the above fatty acids and chemotactic compounds in which some or all of the hydrogen atoms of their compounds are replaced with fluorine atoms, amides of the above fatty acids, aliphatic amines, higher alcohols, polyalkylenes. Known dispersants such as oxide alkyl phosphates, alkyl phosphates, alkyl borates, sarcoxinates, alkyl ether esters, trialkyl polyolefins, oxyquaternary ammonium salts and lecithin can be mentioned.
分散剤を使用する場合は、通常は使用する強磁性粉末1
00重量部に対し、[11〜10重量部の範囲で使用さ
れる。When using a dispersant, the ferromagnetic powder 1 usually used is
00 parts by weight, [11 to 10 parts by weight is used.
帯電防止剤の例としては、カーボンブラック、カーゼン
ブラックグラフトボ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4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
ムまたは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、スルホン酸、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、アミノスルホン鮫類、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、例えば強磁性体粉末100重量部に
対しIIL1〜10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[L12〜10重量部の範
囲で使用される。Examples of antistatic agents include conductive fine powders such as carbon black and carzen black graft polymers; natural surfactants such as saponins; nonionic surfactants such as alkylene oxides, glycerin and glycidol: high grade Cationic surfactants such as alkylamines, quaternary ammonium salts, salts of pyridine and other heterocyclic compounds, phosphoniums or sulfoniums:
Anionic surfactants containing acidic groups such as carboxylic acid, sulfonic acid, phosphoric acid, sulfuric ester groups, and phosphoric ester groups; can be mentioned. When using the above-mentioned conductive fine powder as an antistatic agent, for example, it is used in a range of 1 to 10 parts by weight of IIL per 100 parts by weight of ferromagnetic powder, and similarly when using a surfactant, [ L is used in a range of 12 to 10 parts by weight.
追加の潤滑剤の例としては、前記の脂肪酸、高級アルコ
ール類、ブナルステアレート、ソルビタンオレエート等
の炭素数12〜20の一塩基性脂肪酸と炭素数3〜20
の一価もしくは多価アルコールからなるエステル類、鉱
物油、動植物油、オレフィン低重合体、脂肪酸アミド、
シリコーンオイル、変性シリコーンオイル、脂肪酸のア
ルキVンオキサイド付加物のほかにグラファイト微粉末
\二硫化モリブデン微粉末、テトラフルオロエチレン重
合体微粉末などの公知の潤滑剤およびプラスチック用潤
滑剤を挙げることができる。Examples of additional lubricants include the above-mentioned fatty acids, higher alcohols, monobasic fatty acids with 12 to 20 carbon atoms such as bunal stearate, and sorbitan oleate, and monobasic fatty acids with 3 to 20 carbon atoms.
Esters consisting of monohydric or polyhydric alcohols, mineral oils, animal and vegetable oils, olefin low polymers, fatty acid amides,
In addition to silicone oil, modified silicone oil, and alkylene oxide adducts of fatty acids, known lubricants such as graphite fine powder, molybdenum disulfide fine powder, and tetrafluoroethylene polymer fine powder, and lubricants for plastics may be mentioned. can.
なお、上述した分散剤、帯電防止剤、潤滑剤などの添加
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
が潤滑剤あるいけ帯電防止剤として作用することも有り
うる。従って、上記分類により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
とは勿論であり、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, antistatic agents, and lubricants are not strictly limited to having only the above-mentioned effects; for example, if the dispersant is a lubricant, It may also act as an antistatic agent. Therefore, it goes without saying that the effects of the compounds exemplified by the above classifications are not limited to those listed in the above classifications, and when using a substance that has multiple effects, the amount added should be It is preferable to decide in consideration of the action and effect.
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
行なうことも可能であるが、また、接着剤層などを介し
て非磁性支持体上に塗布すること本できる。The magnetic paint thus prepared is applied onto the non-magnetic support described above. Although it is possible to apply the coating directly onto the non-magnetic support, it is also possible to apply the coating onto the non-magnetic support via an adhesive layer or the like.
非磁性支持体上への塗布法の列としては、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
、グラビアコート、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
。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, gravure coating, kiss coating, and casting. coat, spray coat, spin code method, etc.
Moreover, methods other than these can also be used.
また、上記の強磁性体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54−460’
11号および同54−21805号等の各公報に記載さ
れている。Further, the details of the method of dispersing the above-mentioned ferromagnetic powder and binder and the method of applying it to the support can be found in JP-A-54-460'
It is described in various publications such as No. 11 and No. 54-21805.
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α5〜10μmの範囲、通常はt5〜7
.0μmの範囲になるよう塗布される。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
される場合には、通常磁性層中の強磁性体粉末を配向さ
せる処理、すなわち磁場配向処理を施した後、乾燥され
る。また必要により表面平滑化処理がなされる。The thickness of the magnetic layer coated in this way is generally in the range of approximately α5 to 10 μm after drying, and usually t5 to 7 μm.
.. It is coated to a thickness of 0 μm. When the 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. dried. Further, a surface smoothing treatment is performed if necessary.
次に実施例によって本発明を具体的に説明するが、本発
明はこれに限定されるものではない。EXAMPLES Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited thereto.
強磁性体粉末と結合剤に他の添加剤などを加え混練して
磁性塗料を調製するさいの基本組成として次のものを用
いた。この基本組成のものにpKaく10以下の活性水
素をもつ含窒素ヘテロ環化合物をそれぞれ添加の仕方を
変えて加えることにより最終的な磁性塗料を調製した。The following basic composition was used to prepare a magnetic paint by adding and kneading ferromagnetic powder and a binder with other additives. The final magnetic paint was prepared by adding nitrogen-containing heterocyclic compounds having active hydrogen with a pKa of 10 or less to this basic composition in different ways.
基本組成(重量部)
強磁性F’5−Ni合金粉末 100塩化
ビニル・酢酸ビニル共重合体 12ポリウレ
タン 8α−ムt!035
ステアリン酸 1プテルステ
アンート 1メチルエチルケトン
/トルエン(1/1) 250イソシアネート
8なお、前記強磁性Fe−14
1合金粉末は、Ni ′1t10原子憾含み、その粒子
サイズは長軸の長さがcL3μであり、軸比が10であ
った。また塩化ビニル・酢酸ビニル共重合体はその組成
が重合時の組成で塩化ビニル87 vt%、酢酸ビニル
13wt%であった。Basic composition (parts by weight) Ferromagnetic F'5-Ni alloy powder 100 Vinyl chloride/vinyl acetate copolymer 12 Polyurethane 8 α-mut! 035 Stearic acid 1 Pterstearate 1 Methyl ethyl ketone/Toluene (1/1) 250 Isocyanate
8. Note that the ferromagnetic Fe-14
The No. 1 alloy powder contained 10 atoms of Ni'1t, and its particle size had a major axis length of cL3μ and an axial ratio of 10. The composition of the vinyl chloride/vinyl acetate copolymer at the time of polymerization was 87 vt% vinyl chloride and 13 wt% vinyl acetate.
この磁性塗料を非磁性支持体のポリエチレンテレフタレ
ート(10μm厚)に塗布し、磁場配向処理を施した後
乾燥した。This magnetic paint was applied to a non-magnetic support of polyethylene terephthalate (10 μm thick), subjected to magnetic field orientation treatment, and then dried.
このようにして得られた磁気テープの特性を測定した。The characteristics of the magnetic tape thus obtained were measured.
その測定における条件は次のとおりである。The conditions for the measurement are as follows.
(測定条件)
光 沢 45°Gross (スガ試験機
)0/M テープ8■幅、デツキFuj
ix−8中心記録波長 5 MHz
Δf = I MH2でのO/N
目詰り デツキ Fujix−8,25℃
、60係
なお、目詰りは、出力レベルが定常状態より一3 dB
以下に瞬間的に落ちる現象をいう。評価は次のとおシと
する。(Measurement conditions) Gloss 45°Gross (Suga Test Instruments) 0/M Tape 8■ Width, Depth Fuji
ix-8 center recording wavelength 5 MHz Δf = I O/N at MH2 Clogging Depth Fujix-8, 25℃
, 60. In addition, clogging occurs when the output level is -3 dB below the steady state.
The following refers to the phenomenon of instantaneous falling. The evaluation will be as follows.
1時間当り 皆無 0 5〜10回 Δ 10回以上 × 測定結果は次の第1表の通りである。None per hour 0 5-10 times Δ 10 times or more × The measurement results are shown in Table 1 below.
本発明は、pKa(10の活性水素をもつ含窒素ヘテロ
環化合物を用いることKより、強磁性体粉末を結合剤中
に十分分散させることができ、少量の使用で大きな効果
が得られる。使用量が少なくてよいため、分散剤による
磁性層の脆弱化、可塑化というような磁性層物性に4え
る悪影響を小さくでき、しかもそれに基づいて電磁変換
特性、走行耐久性を大きくできるので、両方の性質を高
度に両立することができる。そして、実施例の第1表に
みるように、得られる磁気記録媒体は、飽和磁束密度B
m(G)がpKa≧10の活性水素をもつ含窒素ヘテロ
環化合物であるピペラジン等の場合よりも大きく、角型
比sQ、a/mも同様に大きい。In the present invention, by using a nitrogen-containing heterocyclic compound having an active hydrogen of pKa (10), the ferromagnetic powder can be sufficiently dispersed in the binder, and a large effect can be obtained with a small amount of use. Since only a small amount is required, it is possible to reduce the negative effects on the physical properties of the magnetic layer, such as weakening and plasticization of the magnetic layer caused by the dispersant, and based on this, it is possible to increase the electromagnetic conversion characteristics and running durability, so both As shown in Table 1 of Examples, the obtained magnetic recording medium has a saturation magnetic flux density of B
m(G) is larger than that of piperazine, which is a nitrogen-containing heterocyclic compound having an active hydrogen with pKa≧10, and the squareness ratios sQ and a/m are similarly large.
目づまりについても同様に優れており、走行耐久性がよ
い。It is also excellent in terms of clogging and has good running durability.
代理人 弁理士(8107) 佐々木 清 隆 1
・ 奥、(ほか3名) −ソAgent Patent Attorney (8107) Kiyotaka Sasaki 1
・ Oku, (3 others) - So
Claims (1)
合剤とを含む磁性層を設けてなる磁気記録媒体において
、該磁性層中にpKa<10の活性水素をもつ含窒素ヘ
テロ環化合物を含有することを特徴とする磁気記録媒体
。 2)強磁性体粉末にpKa<10の活性水素をもつ含窒
素ヘテロ環化合物を被覆させた後、結合剤中に分散させ
、その分散物により非磁性支持体の一面または両面に強
磁性体粉末を含有する磁性層を形成することを特徴とす
る磁気記録媒体の製造方法。[Scope of Claims] 1) A magnetic recording medium comprising a magnetic layer containing ferromagnetic powder and a binder on one or both surfaces of a non-magnetic support, in which active hydrogen with pKa<10 is provided in the magnetic layer. A magnetic recording medium characterized by containing a nitrogen-containing heterocyclic compound. 2) After coating the ferromagnetic powder with a nitrogen-containing heterocyclic compound having active hydrogen with pKa<10, it is dispersed in a binder, and the dispersion coats the ferromagnetic powder on one or both sides of the non-magnetic support. 1. A method of manufacturing a magnetic recording medium, comprising forming a magnetic layer containing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61228440A JPS6383916A (en) | 1986-09-29 | 1986-09-29 | Magnetic recording medium and its producton |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61228440A JPS6383916A (en) | 1986-09-29 | 1986-09-29 | Magnetic recording medium and its producton |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6383916A true JPS6383916A (en) | 1988-04-14 |
Family
ID=16876524
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61228440A Pending JPS6383916A (en) | 1986-09-29 | 1986-09-29 | Magnetic recording medium and its producton |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6383916A (en) |
-
1986
- 1986-09-29 JP JP61228440A patent/JPS6383916A/en active Pending
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