JPS58161133A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS58161133A
JPS58161133A JP57045346A JP4534682A JPS58161133A JP S58161133 A JPS58161133 A JP S58161133A JP 57045346 A JP57045346 A JP 57045346A JP 4534682 A JP4534682 A JP 4534682A JP S58161133 A JPS58161133 A JP S58161133A
Authority
JP
Japan
Prior art keywords
magnetic
magnetic powder
powder
magnetic layer
surfactant
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
Application number
JP57045346A
Other languages
Japanese (ja)
Inventor
Shigeo Aoyama
茂夫 青山
Fumio Togawa
文夫 戸川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP57045346A priority Critical patent/JPS58161133A/en
Publication of JPS58161133A publication Critical patent/JPS58161133A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62Record carriers characterised by the selection of the material
    • G11B5/68Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/7013Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dispersing agent

Landscapes

  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)

Abstract

PURPOSE:To enhance dispersibility and surface smoothness, by incorporating a maleate type high mol.wt. surfactant into a magnetic layer. CONSTITUTION:A vinyl compound-maleate copolymer with 1,000-100,000mol.wt. represented by the formula (where R1 is a vinyl compound, R2 is Na or K, and n is an integer of 2-400) is incorporated into a magnetic layer consisting essentially of magnetic powder and a binder such as resin. The surfactant is incorporated into the magnetic layer by dissolving the surfactant in water, adding the magnetic powder to the soln., and carrying out surface treatment.

Description

【発明の詳細な説明】 この発明は磁気記録媒体に関し、その目的とするところ
は、磁性粉末の分散性および分散安定性に優れ、表面平
滑性が良好で電気的特性に優れた磁性層を有する磁気記
録媒体を提供することにある。
Detailed Description of the Invention The present invention relates to a magnetic recording medium, and its object is to have a magnetic layer having excellent dispersibility and dispersion stability of magnetic powder, good surface smoothness, and excellent electrical properties. The purpose of this invention is to provide a magnetic recording medium.

磁気記録媒体は、通常、磁性粉末、結合剤成分、有機溶
剤およびその他の必要成分からなる磁性塗料をポリエス
テルフィルムなどの基体上に塗布、乾燥してつくられ、
磁性層の表面平滑性が良好で電気的特性に優れるととも
に耐久性に優れたものが要求される。
Magnetic recording media are usually made by applying a magnetic paint consisting of magnetic powder, a binder component, an organic solvent, and other necessary components onto a substrate such as a polyester film, and drying the coating.
The magnetic layer is required to have good surface smoothness, excellent electrical properties, and excellent durability.

その起め、使用される磁性粉末は分散性に優れ、磁性層
の表向平滑性を良好にして磁気記録媒体に高1III麿
、高SN比などの優れた電気的特性を付与できるととも
に耐久性を向上できるものが望ましいが、従来の磁性粉
末では、いまひとつ磁性粉末の分散性が充分に良好でな
く凝集し易い傾向がある。
The reason for this is that the magnetic powder used has excellent dispersibility, and the surface smoothness of the magnetic layer is good, giving the magnetic recording medium excellent electrical properties such as a high I/R ratio and a high signal-to-noise ratio, as well as durability. However, conventional magnetic powders do not have sufficiently good dispersibility and tend to aggregate easily.

この発明nらはかかる現状に鑑み種々検討を行なった結
果、磁性層中にマレイン#環系高分子量界面活性剤を含
有させると磁性粉末の分散性と分散安定性が充分に改善
され、磁性層の表面平滑性が一段と良好になって電気的
特性が一段と向上されることを見いだし、この発明をな
すに至った。
As a result of various studies conducted in view of the current situation, the present inventors and their colleagues found that the dispersibility and dispersion stability of the magnetic powder were sufficiently improved by incorporating a maleic #cyclic high molecular weight surfactant into the magnetic layer. It has been discovered that the surface smoothness of the material is further improved and the electrical characteristics are further improved, leading to the present invention.

この発明において使用されるマレイン酸塩系高分子量′
#面活性剤は、 一般式 (但し、R1はビニル化合物、R,はNaまたはに1n
は2〜400の11敗である。) で表わされるビニル化合物と!レイン#塩の共重合体で
、分子量1000〜100000のものが好ましく使用
され、具体例としては、たとえば下記の構造式で表わさ
れる花王石鹸社製デモールP、デモールST、デモール
EPなどが挙げられる。
Maleate-based polymer used in this invention
#The surfactant has the general formula (where R1 is a vinyl compound, R is Na or
has 11 losses between 2 and 400. ) and the vinyl compound represented by! Rhein # salt copolymers having a molecular weight of 1,000 to 100,000 are preferably used, and specific examples include Demol P, Demol ST, and Demol EP manufactured by Kao Soap Co., Ltd., which are represented by the following structural formulas.

デモールP(酢酸ビニル−マレイン酸ソーダ共重合体) デモールST(スチレン−マレイン酸ソーダ共重合体) HC−C−CHs CH。Demol P (vinyl acetate-sodium maleate copolymer) Demol ST (styrene-sodium maleate copolymer) HC-C-CHs CH.

デモールEP(ビニ°ル誘導体−マレイン酸ソーダ共重
合体) この種のマレイン酸塩系高分子量界面活性剤は、水溶性
で水溶液中で分散された磁性粉末と接すると粒子表面に
良好に被着して被膜を形成し、磁性粉末の分散性と分散
安定性を充分に改善して磁性層の表面平滑性を良好なも
のとし、電気的特性を一段と向上する。
Demol EP (vinyl derivative-sodium maleate copolymer) This type of maleate-based high molecular weight surfactant is water-soluble and adheres well to the particle surface when it comes into contact with magnetic powder dispersed in an aqueous solution. The magnetic powder is then coated to form a film, and the dispersibility and dispersion stability of the magnetic powder are sufficiently improved, the surface smoothness of the magnetic layer is improved, and the electrical properties are further improved.

このようなマレイン酸塩系高分子量界面活性剤を磁性層
中に含有させるには、これらを水に溶解し、この水溶液
に乾燥された磁性粉末を添加して磁性粉末の表面処理を
行なうか、または鉄その他の金属塩水溶液とアルカリ水
溶液とを混合したりして観造され、また処理された磁性
粉末の水分散液をそのまま使用し、この水分散液中にマ
レイン酸塩糸高分子皺界面活性剤を添加して磁性粉末の
表面処理を行ない、乾燥後この磁性粉末を使用して磁性
塗料を調製するなどの方法によって行なわれる。使用量
は磁性粉末に対して0.1〜10重置襲の範囲内で使用
するのが好ましく、少なすぎると所期の効果が得られず
、多すぎると磁性層の表面平滑性が劣化する。
In order to incorporate such maleate-based high molecular weight surfactants into the magnetic layer, they can be dissolved in water, and dried magnetic powder can be added to this aqueous solution to perform surface treatment on the magnetic powder. Alternatively, an aqueous dispersion of magnetic powder that has been shaped and treated by mixing an aqueous solution of iron or other metal salts with an aqueous alkaline solution is used as it is, and in this aqueous dispersion, maleate thread polymer wrinkles are formed. The surface treatment of the magnetic powder is carried out by adding an activator, and after drying, the magnetic powder is used to prepare a magnetic paint. The amount used is preferably within the range of 0.1 to 10 times the magnetic powder. If it is too small, the desired effect will not be obtained, and if it is too large, the surface smoothness of the magnetic layer will deteriorate. .

この発明に使用する磁性粉末としては、たとえばr−F
e、O1粉末、F e 304粉末、Co含含有−Fe
203粉末、Co含有Fe、0.粉末の他、Fe粉末、
Co粉末、Fe−Ni粉末などの金属粉末など従来公知
の各種磁性粉末が広く包含される。
Examples of the magnetic powder used in this invention include r-F
e, O1 powder, Fe 304 powder, Co-containing -Fe
203 powder, Co-containing Fe, 0. In addition to powder, Fe powder,
Various conventionally known magnetic powders such as metal powders such as Co powder and Fe-Ni powder are widely included.

また、結合剤樹脂としては、塩化ビニル−酢酸ビニル系
共重合体、ポリビニルブチラール樹脂、繊維両系4!1
脂、ポリウレタン系樹脂、イソシアネート化合物など従
来から汎用されている結合剤樹脂がいずれも用いられる
。− 有+1溶剤としては、シクロヘキサノン、メチルエチル
ケトン、メチルイソブチルナトンなどのケトン糸溶剤、
酢酸エチル、酢酸ブチルなどのエステル系溶剤、ベンゼ
ン、トルエン、キシレンナトの芳香族炭化水素系溶剤、
イソプロピルアルコールなどのアルコール系溶剤、ジメ
チルホルムアミドなどの酸アミド糸溶剤、ジメチルスル
ホキシドなどのスルホキシド系溶剤、テトラヒドロフラ
ン、ジオキサンなどのエーテル系溶剤など、使用する結
合剤樹脂を溶解するのに適した溶剤が特に制限されるこ
となく単独または二種以上混合して使用される。
In addition, as the binder resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, fiber double type 4!1
Any conventional binder resin such as resin, polyurethane resin, or isocyanate compound can be used. - Examples of +1 solvents include ketone thread solvents such as cyclohexanone, methyl ethyl ketone, and methyl isobutyl naton;
Ester solvents such as ethyl acetate and butyl acetate, aromatic hydrocarbon solvents such as benzene, toluene and xylene sodium,
Solvents suitable for dissolving the binder resin used are particularly suitable, such as alcoholic solvents such as isopropyl alcohol, acid amide yarn solvents such as dimethylformamide, sulfoxide solvents such as dimethyl sulfoxide, and ethereal solvents such as tetrahydrofuran and dioxane. They may be used alone or in combination of two or more without any restriction.

なお、磁性塗料中には通常使用されている各種添加剤、
たとえば分散剤、潤滑剤、研磨剤、帯電防止剤などを適
宜に添加使用してもよい。
In addition, various additives commonly used in magnetic paints,
For example, dispersants, lubricants, abrasives, antistatic agents, etc. may be added as appropriate.

次に、この発明の実施例について説明する。Next, embodiments of the invention will be described.

実施例1 針状r−Fe、0@磁性粉末    1800f硫醗コ
バル) (CO5O,・7H,O)    600 F
硫酸第−銖(FeS04・7H,O)    1800
 F苛性ソーダ          2128F上記の
成分を含む分散液181を45℃にて8時間反応させた
後、水洗し、p遇した。次いで得られたスラリー中に、
デモールP(花王石鹸社製マレイン酸塩系高分子量界面
活性剤)−10(lを溶解した水溶液301を加え、8
時間分散処理した後、乾燥してコバルト含有r−Fel
O1磁性粉末を得た。得られたコバルシ含有r −Fe
、03磁性粉末に対するデモールPの被着量は35Mf
/Iであった。このように・して得られたコバルト含有
r −Fe、03磁性粉末を使用し、 Co含有r−Fe20.磁性粉末   100重ii部
(デモールPの被着量35Hf/f) VAGH(米国U、C,C社製、塩化    18 N
ビニル−酢酸ビニル−ビニルアル コール共重合体) タケラックE−5517(武1)  12 #薬品工業
社製、ポリウレタンエラ ストマー) デスモジューA/L(パイエラ社製、31三官能性低分
子量インシアネート 化合物) ラウリン酸            2 〃シクロへキ
サノン        80 #トルエン      
      80 gの組成からなる混合物をボールミ
ルで約100時聞直合分散して磁性塗料を調製した。こ
の磁性塗料を厚さ12μのポリエステルフィルム上&:
乾燥厚が約3声となるように塗布、乾燥し、表面処理を
行なった後、所定の巾に裁断して磁気テープをつくった
Example 1 Acicular r-Fe, 0@magnetic powder 1800f sulfur cobal) (CO5O, 7H, O) 600 F
Sulfuric acid (FeS04.7H,O) 1800
F Caustic Soda 2128F Dispersion 181 containing the above components was reacted at 45° C. for 8 hours, then washed with water and treated. Then in the resulting slurry,
Demol P (maleate-based high molecular weight surfactant manufactured by Kao Soap Co., Ltd.)-10 (add 301 liters of an aqueous solution and
After time dispersion treatment, it is dried to form cobalt-containing r-Fel.
O1 magnetic powder was obtained. The obtained Kobalsi-containing r -Fe
, the amount of Demol P deposited on the 03 magnetic powder was 35 Mf.
/I was. Using the cobalt-containing r-Fe20.03 magnetic powder thus obtained, Co-containing r-Fe20. Magnetic powder 100 parts by weight (Demol P coating amount 35 Hf/f) VAGH (manufactured by U, C, C, USA, chloride 18 N
Vinyl-vinyl acetate-vinyl alcohol copolymer) Takelac E-5517 (Bu 1) 12 #Manufactured by Yakuhin Kogyo Co., Ltd., polyurethane elastomer) Desmodu A/L (manufactured by Pieera, 31 trifunctional low molecular weight incyanate compound) Lauric acid 2 〃Cyclohexanone 80 #Toluene
A magnetic paint was prepared by dispersing 80 g of the mixture in a ball mill for about 100 hours. Apply this magnetic paint on a 12μ thick polyester film &:
After coating and drying to a dry thickness of about 3 tones and surface treatment, the magnetic tape was cut to a predetermined width.

実施例2 実施例1におけるコバルト含有r −Fe、0.磁性粉
末の表面処理において、デーt−ALPに代えてデモー
ルST(花王石鹸社製マレイン酸塩系高分子量界面活性
剤)を同量使用した以外は実施例1と同様にしてコバル
ト含有r −Fe、O,in性粉末の表面処理を行ない
、実施例1で使用したコバルト含有r −Fe、O,磁
性粉末に代えてデモールSTを35Nf/f被着したコ
バルト含有r −Fe2O,磁性粉末を同量使用した以
外は実施例1と同様にして磁気テープをつくった。
Example 2 Cobalt-containing r-Fe in Example 1, 0. In the surface treatment of the magnetic powder, cobalt-containing r-Fe , O, in powder was subjected to surface treatment, and instead of the cobalt-containing r -Fe, O, magnetic powder used in Example 1, a cobalt-containing r -Fe2O, magnetic powder coated with Demol ST at 35 Nf/f was used. A magnetic tape was produced in the same manner as in Example 1, except that the amount used was different.

実−例3 実−例1におけるコバルト含有r −Fe、01磁性粉
末の表面処理において、デモールPに代えてデモールE
P(花王石鹸社製マレイン酸塩系高分子皺界面活性剤)
を同量使用した以外は実施例1と同様にしてコバルト含
有r −Fe、Os磁性粉末の表面処理を行ない、実施
例1で使用したコバルF含有γ−Fe20.磁性粉末に
代えて、デモールEPを35Mf/f被着したコバルト
含有r −Fe、03磁性粉末を同量使用した以外は実
施例1と同様にして磁気テープをつくった。
Practical Example 3 In the surface treatment of the cobalt-containing r -Fe, 01 magnetic powder in Practical Example 1, Demol E was used instead of Demol P.
P (maleate-based polymer wrinkle surfactant manufactured by Kao Soap Co., Ltd.)
Cobalt-containing r-Fe, Os magnetic powder was surface-treated in the same manner as in Example 1 except that the same amount of cobal-F-containing γ-Fe20. A magnetic tape was produced in the same manner as in Example 1, except that the same amount of cobalt-containing r-Fe, 03 magnetic powder coated with Demol EP at 35 Mf/f was used in place of the magnetic powder.

比較例 実施例1においてコバルト含有r −Fe2O,磁性粉
末の表面処理を省いた以外は実施例1と同様にしてコバ
ルト含有γ−Fe、O,′Ba性粉末を得、このように
して得られたコバルト含有r −Fe2O,磁性粉末を
実施例1で使用したコバルト含有γ−Fe、0゜磁性粉
末に代えて同量使用した以外は実施例1と同様にして磁
気テープをつくった。
Comparative Example Cobalt-containing γ-Fe, O, 'Ba powder was obtained in the same manner as in Example 1 except that the surface treatment of the cobalt-containing r -Fe2O, magnetic powder in Example 1 was omitted. A magnetic tape was prepared in the same manner as in Example 1, except that the same amount of cobalt-containing r -Fe2O magnetic powder was used in place of the cobalt-containing γ-Fe, 0° magnetic powder used in Example 1.

各実施例および比較例で得られた磁気テープについて、
15KHzにおける出力、DCノイズおよび磁性層の表
面粗さを測定した。磁性層の表面粗さは触針式表面粗さ
計で測定し、表面粗さの数値はセンターラインアベレー
ジ(C,L、A ’)で表わした。
Regarding the magnetic tapes obtained in each example and comparative example,
The output at 15 KHz, DC noise, and surface roughness of the magnetic layer were measured. The surface roughness of the magnetic layer was measured using a stylus type surface roughness meter, and the numerical value of the surface roughness was expressed as a center line average (C, L, A').

下表はその結果である。The table below shows the results.

上表から明らかなように、この発明で得られた磁気テー
プ(実施例1〜3)は、従来の磁気テープ(比較例)に
比し、出力が大きく、またDCノイズが低くて表面粗さ
が小さく、このことからこの発明によって得られる磁気
記録媒体は磁性粉末の分散性に優れ、磁性層の表面平滑
性が良好で電気的特性に優れていることがわかる。
As is clear from the table above, the magnetic tapes obtained by the present invention (Examples 1 to 3) have higher output, lower DC noise, and lower surface roughness than conventional magnetic tapes (Comparative Examples). This indicates that the magnetic recording medium obtained by the present invention has excellent dispersibility of magnetic powder, good surface smoothness of the magnetic layer, and excellent electrical properties.

特許出願人  日立マクセル株式金社Patent applicant: Hitachi Maxell, Ltd.

Claims (1)

【特許請求の範囲】[Claims] i、  fiB性層中層中磁性粉末とマレイン酸塩系高
分子量界面活性剤とを含有する磁気記録tX体
i, magnetic recording tX body containing magnetic powder and maleate-based high molecular weight surfactant in the middle layer of the fiB layer;
JP57045346A 1982-03-19 1982-03-19 Magnetic recording medium Pending JPS58161133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57045346A JPS58161133A (en) 1982-03-19 1982-03-19 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57045346A JPS58161133A (en) 1982-03-19 1982-03-19 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS58161133A true JPS58161133A (en) 1983-09-24

Family

ID=12716719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57045346A Pending JPS58161133A (en) 1982-03-19 1982-03-19 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS58161133A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60219627A (en) * 1984-04-17 1985-11-02 Fuji Photo Film Co Ltd Magnetic recording medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60219627A (en) * 1984-04-17 1985-11-02 Fuji Photo Film Co Ltd Magnetic recording medium
JPH0547894B2 (en) * 1984-04-17 1993-07-20 Fuji Photo Film Co Ltd

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