JPS595421A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS595421A JPS595421A JP11458082A JP11458082A JPS595421A JP S595421 A JPS595421 A JP S595421A JP 11458082 A JP11458082 A JP 11458082A JP 11458082 A JP11458082 A JP 11458082A JP S595421 A JPS595421 A JP S595421A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- resin
- magnetic recording
- friction
- recording medium
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record 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
- G11B5/702—Record 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 bonding agent
- G11B5/7023—Record 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 bonding agent containing polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は磁気テープなどの磁気記録媒体に関し、磁性層
表面の摩擦係数が小さい走行特性のすぐれた磁気記録媒
体を提供しようとするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording medium such as a magnetic tape, and an object of the present invention is to provide a magnetic recording medium with a small friction coefficient on the surface of a magnetic layer and excellent running characteristics.
ビデオテープレコーダなどの小型軽量化、高性能化とと
もに高密度化が進み、それに伴なって使用する磁気記録
媒体にも1すまず高性能化、高信頼性が要求されるよう
になってきている。本発明はこれらの性能に密接な関係
を有する走行特性の改善に応えるものである。As video tape recorders and other devices become smaller, lighter, more efficient, and more dense, the magnetic recording media used are also required to have higher performance and reliability. . The present invention responds to the improvement of driving characteristics that are closely related to these performances.
磁気記録媒体の磁性層は通常ポリエステルフィルムなど
の非磁性支持体上に、磁性粉末を結合剤樹脂中に分散し
た磁性塗料を塗着することによって形成される。The magnetic layer of a magnetic recording medium is usually formed by applying a magnetic paint containing magnetic powder dispersed in a binder resin onto a non-magnetic support such as a polyester film.
この結合剤樹脂としては一般に塩化ビニル系樹脂、ウレ
タン樹脂、ニトロセルロース、フェノキシ樹脂、エポキ
シ樹脂などが単独ないしはそれらの混合系として使用さ
れる。As the binder resin, vinyl chloride resin, urethane resin, nitrocellulose, phenoxy resin, epoxy resin, etc. are generally used alone or as a mixture thereof.
これらの樹脂の摩擦係数は約0.4〜0.6程度であり
、これらの樹脂を結合剤とした磁性層の摩擦係数も、樹
脂の摩擦係数が反映し、約0.4〜0.6程度となるの
が一般的である。磁気テープなどにおいては、このよう
に大きな摩擦係数ではテープ走行、ヘッド摩耗などにお
いて支障をきたす。そこで摩擦係数を小さくするために
、脂肪酸類、エステル類、シリコーン浦などの潤滑剤を
磁性層内に含ませるのが一般である。The coefficient of friction of these resins is about 0.4 to 0.6, and the coefficient of friction of a magnetic layer using these resins as a binder is also about 0.4 to 0.6, reflecting the coefficient of friction of the resin. Generally, it is about a certain degree. In magnetic tapes and the like, such a large coefficient of friction causes problems in tape running, head wear, etc. Therefore, in order to reduce the coefficient of friction, it is common to include lubricants such as fatty acids, esters, and silicone in the magnetic layer.
しかしながら、か5る手段で摩擦係数を改善した場合、
潤滑剤の表面への浮き出しによるヘッド目づまり、さら
には−繰返し走行させた場合摩擦係数が変化し、走行性
が不安定になるといった問題が生じる。However, if the friction coefficient is improved by such means,
Problems arise such as head clogging due to the lubricant bulging out onto the surface, and furthermore, the coefficient of friction changes when running repeatedly, making running performance unstable.
本発明は磁性層表面の摩擦係数が小さく、安定した走行
性能を有する磁気記録媒体の提供を目的とするものであ
る。本発明者は磁性層用結合剤としての特性を備え、か
つ摩擦係数の小さい樹脂を種々検討した結果、分子内に
シロキサン結合を有するウレタン樹脂が極めて好結果を
生することを見い出した。すなわち本発明の磁気記録媒
体は、磁性層を形成する結合剤樹脂中に少なくともシロ
キサン結合を有するウレタン樹脂を含有させてなること
を特徴とするものである。An object of the present invention is to provide a magnetic recording medium that has a small coefficient of friction on the surface of a magnetic layer and has stable running performance. The present inventor investigated various resins that have properties as a binder for magnetic layers and have a small coefficient of friction, and as a result, found that urethane resins having siloxane bonds in the molecule produce extremely good results. That is, the magnetic recording medium of the present invention is characterized in that the binder resin forming the magnetic layer contains at least a urethane resin having a siloxane bond.
以下本発明をさらに詳細に説明する。The present invention will be explained in more detail below.
本発明の特徴とする分子内にシロキサン結合を有するウ
レタン樹脂は、ポリエステルポリオールもしくはポリエ
ーテルポリオールと水酸基末端のポリシロキサン類、た
とえばジメチルシロキサンとイソシアネートの反応によ
って得られるものである。このシロキサン結合を有する
ウレタン樹脂は、従来から一般に使用されているポリエ
ステルポリオールもしくはポリエーテルポリオールとイ
ンシアネートの反応から得られるウレタン樹脂に比較し
て、摩擦係数が%〜%であることが特徴である。The urethane resin having a siloxane bond in its molecule, which is a feature of the present invention, is obtained by reacting a polyester polyol or a polyether polyol with a hydroxyl-terminated polysiloxane, such as dimethylsiloxane, and an isocyanate. This urethane resin having siloxane bonds is characterized by a friction coefficient of % to % compared to urethane resins obtained from the reaction of incyanate with polyester polyols or polyether polyols that have been commonly used. .
本発明に用いるウレタン1脂において、分子内に占める
好ましいシロキサン含有量は樹脂全体に対して重量比で
1〜10%の範囲である。シロキサン量がこれ未読にな
ると摩擦係数が改善されない。またこれを超えると接着
力が低下してくる。In the urethane resin used in the present invention, the preferable siloxane content in the molecule is in the range of 1 to 10% by weight based on the entire resin. If the amount of siloxane is too low, the coefficient of friction will not be improved. Moreover, if it exceeds this, the adhesive strength will decrease.
このようなシロキサン結合を含むウレタン樹脂は結合剤
として単独でも適用できるが、ヤング率の調整などが必
要な場合は、従来から使用されている樹脂との混合系と
して用いることができる。Such a urethane resin containing a siloxane bond can be used alone as a binder, but if adjustment of Young's modulus is required, it can be used as a mixture with a conventionally used resin.
また必要に応じて従来から使用されている潤滑剤を適度
に添加してもよい。Further, a conventionally used lubricant may be appropriately added as necessary.
更に、本発明は酸化物系磁性粉および金属系磁性粉を用
いた磁気記録媒体のいづれにも同様に適用でき、またそ
れらの磁気記録媒体は通常の方法で製造することができ
る。Furthermore, the present invention can be similarly applied to magnetic recording media using oxide-based magnetic powders and metal-based magnetic powders, and these magnetic recording media can be manufactured by conventional methods.
以下、本発明の効果を実施例において具体的に示す。Hereinafter, the effects of the present invention will be specifically illustrated in Examples.
次表の扁1〜扁5に示す組成の結合剤樹脂25重量部に
対して下記の割合で各成分を配合し、振動ミルにより4
時間混合分散させて磁性塗料とした。Each component was blended in the proportions shown below to 25 parts by weight of the binder resin having the composition shown in Tables 1 to 5 in the following table.
The mixture was mixed and dispersed for a period of time to obtain a magnetic paint.
金属鉄磁性粉 ・・・・・・・・・・・・・・・・
・・・・・ 100部メチルエチルケトン・・・・・・
・・・・・・・・・・・・・・・ 200部シクロヘキ
サノン ・・・・・・・・・・・・・・・・・・・・・
50部トルエン ・・・・・・・・・・
・・・・・・・・・・・ 150部オレイン酸
・・・・・・・・・・・・・・・・・・・・・ 2部
分散剤 ・・・・・・・・・・・・・・・・
・・・・・ 1部次にこの塗料を通常の方法により1
5μm厚のポリエステルフィルム上に塗布、乾燥して、
4μm厚の磁性層を形成させて磁気記録媒体とした。Metallic iron magnetic powder ・・・・・・・・・・・・・・・・・・
... 100 parts methyl ethyl ketone ...
・・・・・・・・・・・・・・・ 200 parts cyclohexanone ・・・・・・・・・・・・・・・・・・
50 parts toluene ・・・・・・・・・・・・
・・・・・・・・・・・・ 150 parts oleic acid
・・・・・・・・・・・・・・・・・・ 2-part powder ・・・・・・・・・・・・・・・・・・
・・・・・・ 1 part Next, apply this paint to 1 part by the usual method.
Coated on a 5 μm thick polyester film, dried,
A magnetic recording medium was prepared by forming a magnetic layer with a thickness of 4 μm.
次表の扁1〜A5に本実施例に使用した結合剤樹脂なら
び゛にそれらの結合剤を含む磁気記録媒体の磁性層面の
摩擦係数を示す。Tables 1 to A5 in the following table show the binder resins used in this example and the friction coefficients of the magnetic layer surfaces of magnetic recording media containing these binders.
なお、摩擦係数の測定は平面支持台上に測定試料の測定
面を上にして固定し、測定面上を一定荷重を加えたスチ
ルボールをスライドさせ、その時にスチルボールに働く
摩擦力を測定することにより求めた。1回目のスライド
における摩擦係数μに1と、同じ場所を繰返し1oρ回
スライドさせた時の摩擦係数μに100でその安定性の
評価を行った。To measure the friction coefficient, fix the measurement sample on a flat support stand with the measurement surface facing up, slide a still ball with a constant load applied over the measurement surface, and measure the frictional force acting on the still ball at that time. I asked for it. The stability was evaluated by setting the friction coefficient μ of 1 for the first slide and 100 for the friction coefficient μ of repeatedly sliding the same place 10ρ times.
寸だこれらの記録媒体をビデオテープに加工し、ビデオ
テープレコーダに実装し走行特性の判定を行った。走行
特性は、テープ鳴き、ジッターの横ゆれ、早送り2巻も
どしにおけるテープの捲き姿などから総合的に評価し、
決定的な問題点を有するものを評価1とし、すべての点
で問題なくすぐれた走行特性を有するものを評価5とし
、6段階で判定した。These recording media were processed into video tapes, mounted on a video tape recorder, and the running characteristics were evaluated. The running characteristics are comprehensively evaluated based on tape squeal, jitter lateral fluctuation, tape winding appearance during fast forwarding and rewinding, etc.
A rating of 1 was given to those with definite problems, and a rating of 5 was given to those with excellent running characteristics without any problems in all respects, and the evaluation was made on a 6-level scale.
(以下余白)
■−比較例
上記表から明らかなように、シロギサン結合を有するウ
レタン樹脂を結合剤に用いた本発明の磁気記録媒体は、
摩擦係数が小さく、繰返しにおりてもその変化が小さく
、捷た実用走行の面でも優れた特性を有するものである
。(Left below) ■- Comparative Example As is clear from the above table, the magnetic recording medium of the present invention using a urethane resin having a siloysan bond as a binder has the following characteristics:
The coefficient of friction is small, its change is small even after repeated friction, and it has excellent characteristics in terms of practical running.
Claims (1)
た磁性層を形成するとともに、前記結合剤樹脂中に分子
内にシロキサン結合を有するウレタン樹脂を含有させて
なる磁気記録媒体。A magnetic recording medium comprising a magnetic layer formed by dispersing magnetic powder in a binder resin on a non-magnetic support, and a urethane resin having a siloxane bond in the molecule contained in the binder resin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11458082A JPS595421A (en) | 1982-06-30 | 1982-06-30 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11458082A JPS595421A (en) | 1982-06-30 | 1982-06-30 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS595421A true JPS595421A (en) | 1984-01-12 |
JPH0452526B2 JPH0452526B2 (en) | 1992-08-24 |
Family
ID=14641396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11458082A Granted JPS595421A (en) | 1982-06-30 | 1982-06-30 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS595421A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6262429A (en) * | 1985-09-13 | 1987-03-19 | Sony Corp | Magnetic recording medium |
JPS6262428A (en) * | 1985-09-13 | 1987-03-19 | Sony Corp | Magnetic recording medium |
JPS62205116A (en) * | 1986-03-04 | 1987-09-09 | Dainichi Color & Chem Mfg Co Ltd | Resin modifier and method for modifying resin |
JPS63317514A (en) * | 1987-05-28 | 1988-12-26 | ロード コーポレーション | Coating composition and manufacture |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58218034A (en) * | 1982-06-10 | 1983-12-19 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
-
1982
- 1982-06-30 JP JP11458082A patent/JPS595421A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58218034A (en) * | 1982-06-10 | 1983-12-19 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6262429A (en) * | 1985-09-13 | 1987-03-19 | Sony Corp | Magnetic recording medium |
JPS6262428A (en) * | 1985-09-13 | 1987-03-19 | Sony Corp | Magnetic recording medium |
JPS62205116A (en) * | 1986-03-04 | 1987-09-09 | Dainichi Color & Chem Mfg Co Ltd | Resin modifier and method for modifying resin |
JPH0441693B2 (en) * | 1986-03-04 | 1992-07-09 | Dainichi Seika Kogyo Kk | |
JPS63317514A (en) * | 1987-05-28 | 1988-12-26 | ロード コーポレーション | Coating composition and manufacture |
Also Published As
Publication number | Publication date |
---|---|
JPH0452526B2 (en) | 1992-08-24 |
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