JPS629534A - Production of magnetic recording medium - Google Patents

Production of magnetic recording medium

Info

Publication number
JPS629534A
JPS629534A JP60147648A JP14764885A JPS629534A JP S629534 A JPS629534 A JP S629534A JP 60147648 A JP60147648 A JP 60147648A JP 14764885 A JP14764885 A JP 14764885A JP S629534 A JPS629534 A JP S629534A
Authority
JP
Japan
Prior art keywords
magnetic
coating
recording medium
magnetic recording
magnetic 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
Application number
JP60147648A
Other languages
Japanese (ja)
Inventor
Hiromi Sato
博美 佐藤
Toshihisa Inabe
稲部 敏久
Eikichi Yoshida
栄吉 吉田
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.)
Tokin Corp
Original Assignee
Tohoku Metal Industries 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 Tohoku Metal Industries Ltd filed Critical Tohoku Metal Industries Ltd
Priority to JP60147648A priority Critical patent/JPS629534A/en
Publication of JPS629534A publication Critical patent/JPS629534A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lubricants (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To obtain a magnetic recording medium having excellent running property and durability by coating a mixture composed of a higher fatty acid hydrazide and specific copolymer on a magnetic layer formed by coating a magnetic paint contg. carbon black having a prescribed oil absorption on a non-magnetic substrate and drying the coating. CONSTITUTION:The magnetic layer is formed by coating the magnetic paint contg. 1-15wt% carbon black having >=300ml/100g oil absorption on the non- magnetic substrate and drying the coating. The surface coating liquid prepd. by dissolving 5pts.wt. higher fatty acid hydrazide and 95pts.wt. the polysiloxane/ polyoxy alkylene copolymer expressed by formula I (where m is 5-40, n is 1-5, a is 0-4, b is 5-20, a/b<0.2, R is an alkyl group of 1-4C) in 2,000pts.wt. n-hexane is coated on the magnetic layer at 1.2pts.wt. by the weight of the magnetic powder in the magnetic layer and is dried. The magnetic recording medium having the excellent running property and durability is thus obtd.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は走行性に富み、耐久性に優れた磁気記録媒体の
製造方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a magnetic recording medium that has excellent running properties and excellent durability.

〔従来技術〕[Prior art]

一般に磁気テープ、フレキシブル磁気ディスク等の磁気
記録媒体は、ポリエステルフィルム等の非磁性支持体上
に磁性粉末、バインダー、溶剤。
Generally, magnetic recording media such as magnetic tapes and flexible magnetic disks are made by depositing magnetic powder, binder, and solvent on a non-magnetic support such as polyester film.

および分散剤;潤滑剤、帯電防止剤、研磨材等の各種添
加剤からなる磁性塗料を塗布、乾燥することにより得ら
れる。
and a dispersant; obtained by applying and drying a magnetic paint consisting of various additives such as a lubricant, an antistatic agent, and an abrasive.

ところで、近年、磁気記録媒体には一段と高密度化が要
求されており、より優れた磁気特性、電磁変換特性を得
るため、微粒子化、高保磁力化された磁性粉末が使用さ
れると共に、磁性層も益々薄膜化される傾向にある。
Incidentally, in recent years, there has been a demand for higher densities in magnetic recording media, and in order to obtain better magnetic properties and electromagnetic conversion properties, finer particles and higher coercive force magnetic powders are used, and the magnetic layer There is also a tendency for films to become thinner and thinner.

一方、耐久性に関しては、この薄膜化が磁気記録媒体の
機械的強度の低下をきたし、従って薄膜化が非常に厳し
いものとなる。このため従来の磁気記録媒体よりも優れ
た耐久性を有する磁気記録媒体が要求されている。
On the other hand, in terms of durability, this reduction in film thickness causes a decrease in the mechanical strength of the magnetic recording medium, and therefore, reduction in film thickness is extremely difficult. For this reason, there is a need for magnetic recording media that have greater durability than conventional magnetic recording media.

上述の要求を満たすため、従来は磁性層中に。In order to meet the above requirements, conventionally, in the magnetic layer.

高級脂肪酸、高級脂肪酸アミド、高級脂肪族アルコール
、高級脂肪酸エステル等の高級脂肪族化合物、あるいは
シリコーンオイル、フッ素オイル等の潤滑剤を単独又は
、複合させた状態で含有させていた。
Higher aliphatic compounds such as higher fatty acids, higher fatty acid amides, higher aliphatic alcohols, and higher fatty acid esters, or lubricants such as silicone oil and fluorine oil have been contained singly or in combination.

気記録媒体では要求される耐久性を充分に確保するまで
には至っていなかった。例えば、過度の潤滑剤を含有さ
せ、耐久性を確保しようとした場合。
Air recording media have not yet been able to sufficiently ensure the required durability. For example, if you try to ensure durability by adding too much lubricant.

磁気記録媒体を長時間、高温、高湿の環境で使用すると
、潤滑剤が磁性層表面にしみ出す所謂プルーミングが発
生し、テープの貼付き現象、ステップ−スリップ、ある
いはヘッド汚れによる出力低下、さらには°ヘッド汚れ
に起因する磁性層の機械的変型(ドロップイン−アウト
)等の問題が生じる。
When a magnetic recording medium is used in a high temperature, high humidity environment for a long period of time, so-called pluming occurs in which the lubricant seeps onto the surface of the magnetic layer, resulting in decreased output due to tape sticking, step-slip, or head contamination. Problems such as mechanical deformation (drop-in-out) of the magnetic layer arise due to head contamination.

本発明の目的は、かかる従来の欠点を解消し。The object of the present invention is to eliminate such conventional drawbacks.

走行性に富み、耐久性に優れた磁気記録媒体を提供する
ことにある。
An object of the present invention is to provide a magnetic recording medium with excellent running properties and excellent durability.

〔問題点を解決する念めの手段〕[A precautionary measure to resolve the problem]

本発明は少なくとも、吸油量が300mJ/100gの
カービンブラックを含有する磁性塗料を非磁性支持体上
に、塗布・乾燥して形成される磁性層上に、更に高級脂
肪酸ヒドラジドと一般式が。
In the present invention, a magnetic coating containing at least carbine black with an oil absorption of 300 mJ/100 g is coated on a non-magnetic support, and then dried to form a magnetic layer, which is further coated with higher fatty acid hydrazide and a general formula.

C3H6(OC2H4)3(OC3H6)bORで表わ
されるポリシロキサン−ポリオキシアルキレン共重合体
を含有させることを特徴とする。
It is characterized by containing a polysiloxane-polyoxyalkylene copolymer represented by C3H6(OC2H4)3(OC3H6)bOR.

〔作用〕[Effect]

特定なカーボンブラックを含む磁性層上に、更に2種の
特定潤滑剤を含有させ、この両者を併用させることで、
薄膜化された磁気記録媒体においても優れた磁気特性、
電磁変換特性を維持したままで、プルーミングを起さず
、テープの貼付き現象、ステップ−スリップ、あるいは
ヘッド目づまりによる出力低下、さらにはヘッド汚れに
起因する機械的変型等の生じない優れた耐久性を有する
磁気記録媒体を提供することができる。
By further containing two types of specific lubricants on the magnetic layer containing specific carbon black, and using both of them together,
Excellent magnetic properties even in thin magnetic recording media,
Excellent durability while maintaining electromagnetic conversion characteristics without causing pluming, tape sticking phenomenon, step-slip, output reduction due to head clogging, and mechanical deformation due to head dirt. It is possible to provide a magnetic recording medium having the following properties.

〔実施例〕〔Example〕

以下本発明について実施例によって説明する。 The present invention will be explained below with reference to Examples.

なお、この実施例で用いるカービンブラックの市販品と
しては9例えば、ライオンアクゾ社製のケッチェンブラ
ックEC,ケッチェンブラックECX 。
Commercially available carbine blacks used in this example include Ketjen Black EC and Ketjen Black ECX manufactured by Lion Akzo.

ケッチェンブラックECDJ −600、ケッチェンブ
ラックE、CDJ −500などがある。
Examples include Ketjenblack ECDJ-600, Ketjenblack E, and CDJ-500.

1)試作例 まず、Co被着酸化鉄(吸油量105ml/100& 
1) Prototype example First, Co-coated iron oxide (oil absorption 105ml/100&
.

BIT粒度40 m’/、!i’保磁力(He)=67
00s )を75重置部、塩化ヒニルー酢酸ビニルービ
ニルアルコール共重合体を12.5重量部、ポリウレタ
ン樹脂を12.5重量部、カービンブラック(ケッチェ
ンブラックECDJ −600、吸油量480m1/1
00g )を3.5重量部、α−At205(平均粒径
0.5μm)を2.3重量部、レシチンを0.8重量部
、メチルエチルケトy (MEK) 、 )ルエン、及
ヒシクロヘキサノンをそれぞれ60重量部をが−ルミル
にて50時間混練する。その後イソシアネート化合物を
5重量部加えて、1時間混合分散して、磁性塗料を調製
した。次にこの磁性塗料を厚さが75μmのポリエチレ
ンテレフタレート支持体上に、乾燥後の厚さが2μmと
なるように塗布し、磁性層を形成した。
BIT particle size 40 m'/,! i' coercive force (He) = 67
00s), 12.5 parts by weight of hinyl chloride-vinyl acetate-vinyl alcohol copolymer, 12.5 parts by weight of polyurethane resin, Carbin Black (Ketjen Black ECDJ-600, oil absorption 480 m1/1
00g), 2.3 parts by weight of α-At205 (average particle size 0.5 μm), 0.8 parts by weight of lecithin, 60 parts each of methyl ethyl keto y (MEK), ) toluene, and hiscyclohexanone. Parts by weight were kneaded in a galley mill for 50 hours. Thereafter, 5 parts by weight of an isocyanate compound was added and mixed and dispersed for 1 hour to prepare a magnetic paint. Next, this magnetic paint was applied onto a polyethylene terephthalate support having a thickness of 75 μm so that the thickness after drying would be 2 μm to form a magnetic layer.

この磁性層に高級脂肪酸ヒドラジドの一種であるステア
リン酸ヒドラジドを5重量部及び以下余日 で表わされるポリシロキサン−ポリオキシアルキレン共
重合体jt95重量部をn−ヘキサン2000重量部中
に溶解させて表面処理液を作製した。
In this magnetic layer, 5 parts by weight of stearic acid hydrazide, which is a type of higher fatty acid hydrazide, and 95 parts by weight of a polysiloxane-polyoxyalkylene copolymer jt, which is expressed as hydrazide below, were dissolved in 2000 parts by weight of n-hexane. A treatment solution was prepared.

この表面処理液を表面処理液の固形分が前述した磁性層
中の磁性粉末に対して1.2重量部となるよう磁性層に
塗布し、乾燥の後、外径133mの円盤上シートに打抜
いて試料1を作製した。
This surface treatment liquid was applied to the magnetic layer so that the solid content of the surface treatment liquid was 1.2 parts by weight based on the magnetic powder in the magnetic layer, and after drying, it was applied to a disk-like sheet with an outer diameter of 133 m. Sample 1 was prepared by removing the sample.

2)比較例1 次に上述の試作例で用いたカーボンブラック(ケッチェ
ンブラックECDJ −600、吸油量480m1/1
00,9)の替わりに、吸入量が891nV100.!
i’のカーボンブラック(3,5重量部)を用い、他は
試作例と同様にして、試料2を作成した。
2) Comparative Example 1 Next, carbon black (Ketjen Black ECDJ-600, oil absorption 480 m1/1
00,9), the inhalation amount is 891nV100. !
Sample 2 was prepared using carbon black (3.5 parts by weight) of i', and in the same manner as in the prototype example.

3)比較例2 試作例で用いた で表わされるポリシロキサン−プリオキシアルキレン共
重合体に替えて、ポリツメチルシロキサン(粘度300
センチストークス)95重量部を用い、他は試作例と同
様にして、試料3を作成した。
3) Comparative Example 2 Polymethylsiloxane (viscosity 300
Sample 3 was prepared in the same manner as the prototype example except that 95 parts by weight of the sample was used.

これら、試料1,2.及び3を用いて次の各種試験を行
った。
These samples 1, 2. and 3 were used to conduct the following various tests.

(1)耐久性試験 試料1,2及び3をそれぞれ不織布をはりつけたジャケ
ットに挿入し、磁気記録再生試験機で125 kHzの
信号を記録した。その後、温度40℃、湿度80 S 
RHの雰囲気中で周速1.7 ml秒 において磁気ヘ
ッドと接触させながら、再生出力信号の時間的変化を読
み取り、初期再生出力信号の80チになるまでの時間を
測定した。
(1) Durability Test Samples 1, 2, and 3 were each inserted into a jacket covered with a nonwoven fabric, and a 125 kHz signal was recorded using a magnetic recording/reproducing tester. After that, the temperature was 40℃ and the humidity was 80S.
While contacting with a magnetic head at a circumferential speed of 1.7 ml seconds in an RH atmosphere, temporal changes in the reproduced output signal were read, and the time until the initial reproduced output signal reached 80 degrees was measured.

(ii)  摩擦係数試験 試料1,2及び3をそれぞれ不織布をはりつけたジャケ
ットに挿入して、温度40℃、湿度80%RHの雰囲気
中で周速1.tml秒で磁気ヘッドと接触させながら摩
擦係数を測定した。
(ii) Friction coefficient test Samples 1, 2, and 3 were each inserted into a jacket to which a nonwoven fabric was attached, and the peripheral speed was 1. The friction coefficient was measured while contacting with a magnetic head for tml seconds.

(iiD  Lみ出し試験 試料1,2及び3を温度40℃、湿度80チRHの雰囲
気中に7日間放置した後、常温下に取り出して油分(潤
滑油)のしみ出しを目視した。
(iiD L exudation test Samples 1, 2, and 3 were left in an atmosphere with a temperature of 40° C. and a humidity of 80° RH for 7 days, and then taken out at room temperature and visually observed for oil (lubricating oil) exudation.

これら耐久性試験、摩擦係数試験、及びしみ出し試験の
結果を下記の表に示す。
The results of these durability tests, friction coefficient tests, and seepage tests are shown in the table below.

表 この表より明らかなように2本発明によって作成した試
料1は摩擦係数が小さく一高温高湿中でも長期にわたっ
て走行性に富みかつ耐久性に優れたものであることがわ
かる ジ上述の実施例と同様の特性(効果)を得るためには1
本発明で用いるカーボンブラックは吸油量が300m1
71009以上であれば良く、また添加量は磁性粉末に
対して1〜15重量%、好ましくは3〜7重量−の範囲
であれば良い。一方、高級脂肪酸ヒドラジドとポリシロ
キサン−プリオキシアルキレン共重合体の割合は重量比
で1/99〜10/90゜好ましくは3/97〜5/9
5の範囲にあればよく、また含有量は潤滑剤固形分が磁
性粉末に対して0.5〜2.0重量部、好ましくは1.
0〜1.5重量部の範囲となるように添加すれば良い。
Table 2. As is clear from this table, Sample 1 prepared according to the present invention has a small coefficient of friction, 1. It has excellent running performance over a long period of time even at high temperature and high humidity, and is excellent in durability. To obtain similar characteristics (effects), 1.
The carbon black used in the present invention has an oil absorption capacity of 300ml
71009 or more, and the amount added may be in the range of 1 to 15% by weight, preferably 3 to 7% by weight based on the magnetic powder. On the other hand, the weight ratio of higher fatty acid hydrazide and polysiloxane-prioxyalkylene copolymer is 1/99 to 10/90°, preferably 3/97 to 5/9.
5, and the solid content of the lubricant is 0.5 to 2.0 parts by weight, preferably 1.5 parts by weight, based on the magnetic powder.
It may be added in an amount of 0 to 1.5 parts by weight.

なお、高級脂肪酸ヒドラジドとしては炭素数が12〜2
2の範囲で良く、具体例としては、前述のステアリン酸
ヒドラジドの他にノやルミチン酸ヒドラジド等が挙げら
れる。
In addition, the higher fatty acid hydrazide has 12 to 2 carbon atoms.
Specific examples thereof include stearic acid hydrazide mentioned above, and lumitic acid hydrazide.

以下余日 〔発明の効果〕 以上説明したように本発明による磁気記録媒体の製造方
法によれば、従来の磁気記録媒体に比べて走行性に富み
、しかも耐久性に優れた磁気記録媒体を提供することが
できる。
[Effects of the Invention] As explained above, the method for manufacturing a magnetic recording medium according to the present invention provides a magnetic recording medium that has better running properties and is more durable than conventional magnetic recording media. can do.

Claims (1)

【特許請求の範囲】 1、少なくとも、吸油量が300ml/100gのカー
ボンブラックを含有する磁性塗料を非磁性支持体上に塗
布・乾燥して形成される磁性層上に、更に、高級脂肪酸
ヒドラジドと一般式が ▲数式、化学式、表等があります▼ (但しmは5〜40、nは1〜5、aは0〜4、bは5
〜20で(a/b)<0.2、Rは炭素数1〜4のアル
キル基)で表わされるポリシロキサン−ポリオキシアル
キレン共重合体を含有させることを特徴とする磁気記録
媒体の製造方法
[Claims] 1. On a magnetic layer formed by coating and drying a magnetic paint containing at least carbon black with an oil absorption of 300 ml/100 g, a higher fatty acid hydrazide and a higher fatty acid hydrazide are further applied. The general formula is ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (However, m is 5 to 40, n is 1 to 5, a is 0 to 4, b is 5
~20, (a/b)<0.2, R is an alkyl group having 1 to 4 carbon atoms) A method for producing a magnetic recording medium, characterized by containing a polysiloxane-polyoxyalkylene copolymer
JP60147648A 1985-07-06 1985-07-06 Production of magnetic recording medium Pending JPS629534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60147648A JPS629534A (en) 1985-07-06 1985-07-06 Production of magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60147648A JPS629534A (en) 1985-07-06 1985-07-06 Production of magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS629534A true JPS629534A (en) 1987-01-17

Family

ID=15435097

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60147648A Pending JPS629534A (en) 1985-07-06 1985-07-06 Production of magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS629534A (en)

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