JPS58159228A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS58159228A JPS58159228A JP4238182A JP4238182A JPS58159228A JP S58159228 A JPS58159228 A JP S58159228A JP 4238182 A JP4238182 A JP 4238182A JP 4238182 A JP4238182 A JP 4238182A JP S58159228 A JPS58159228 A JP S58159228A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- powder
- recording medium
- resin
- magnetic recording
- 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
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
- G11B5/7021—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 a polyurethane or a polyisocyanate
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は磁気テープなどの磁気記録媒体に関し、その
目的とするところは厚みが可及的に薄くてしかも機械的
強度に優れ、かつ適度な柔軟性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 such as a magnetic tape, and its object is to provide a magnetic recording medium that is as thin as possible, has excellent mechanical strength, and has appropriate flexibility. Our goal is to provide the following.
近年、磁気テープ等の磁気記録媒体においては、カーシ
リツジケースに組み込んだ際の記録、再生時間をできる
だけ擾くするため厚みを可及的に薄くすることが試みら
れている。ところが磁気テープの厚みを薄くすると機械
的強度が弱くなるため、磁気テープ製造時の磁性塗料の
均一な塗布作業が行ない難くなったり、また、記録、再
生あるいは早送り、巻き戻し時に磁気テープのエツジ部
がガイド部材の磁気テープ走行規制用鍔縁に接して折損
したりする揚台があり、カールも生じ易くなる。In recent years, attempts have been made to reduce the thickness of magnetic recording media such as magnetic tapes as much as possible in order to shorten the recording and playback time as much as possible when incorporated into a car cartridge case. However, reducing the thickness of the magnetic tape weakens its mechanical strength, which makes it difficult to apply magnetic paint uniformly during magnetic tape manufacture, and also causes damage to the edges of the magnetic tape during recording, playback, fast forwarding, and rewinding. However, there is a platform which may break due to contact with the flange edge of the guide member for regulating the running of the magnetic tape, and curling is likely to occur.
このため、ポリエステルフィルムなどのプラスチックフ
ィルム製造時に長手方向に延伸した強化フィルムを磁気
テープの基体フィルムとして使用したりして磁気テープ
の機械的強度の改善が試みられているが、未だ充分では
なく、磁気テープエツジ部の折損やカールを有効に防止
することができない。For this reason, attempts have been made to improve the mechanical strength of magnetic tapes by using longitudinally stretched reinforcing films as base films for magnetic tapes during the production of plastic films such as polyester films, but these efforts have not yet been sufficient. It is not possible to effectively prevent the magnetic tape edge from breaking or curling.
そこで、この発明者らはベースフィルムとともにこのベ
ースフィルム上に形成される磁性層にも着目して種々検
討を行なった結果、ベースフィルムとして厚みが7.0
声以下で長手方向の1%伸びでの弾性率が600 Q/
震−以上のものを使用し、このベースフィルム上に結合
剤成分として分子量が50000以下のぎりウレタン樹
脂を含有する磁性層を形成すると、前記従来の欠点が全
て除去されて機械的強度に優れ、かつ適度な柔軟性を有
する可及的に薄くてしかも電磁弯換特性に優れた磁気記
録媒体が得られることを見いだし、この発明をなすに至
った。Therefore, the inventors conducted various studies focusing on the base film as well as the magnetic layer formed on the base film, and found that the base film had a thickness of 7.0 mm.
The elastic modulus at 1% elongation in the longitudinal direction is 600 Q/
When a magnetic layer containing a urethane resin with a molecular weight of 50,000 or less as a binder component is formed on this base film by using a magnetic material with a molecular weight of 50,000 or less, all of the above-mentioned conventional drawbacks are eliminated and the magnetic layer has excellent mechanical strength. The present inventors have discovered that it is possible to obtain a magnetic recording medium that is as thin as possible, has appropriate flexibility, and has excellent electromagnetic bending characteristics, leading to the present invention.
この発明において使用されるベースフィルムは、得られ
る磁気テープの厚みを可及的に薄くシ、かつ機械的強度
を充分にして折損やカールが生じ鎧いようにするため、
厚みが7.0μ以下で長手方向の1≦伸びでの弾性率が
600 Kg/wa−以上のものを使用するのが好まし
く、ベースフィルムの厚みが7.0声より厚いと可及的
に薄い磁気テープが得られ難く、また長手方向の1≦伸
びでの弾性率が6004/61−より小さいと充分な機
械的強度が得られない。The base film used in this invention is designed to make the thickness of the obtained magnetic tape as thin as possible and to have sufficient mechanical strength to prevent breakage or curling.
It is preferable to use a film with a thickness of 7.0μ or less and an elastic modulus of 600 Kg/wa- or more at 1≦elongation in the longitudinal direction, and if the base film is thicker than 7.0μ, it is as thin as possible. It is difficult to obtain a magnetic tape, and if the elastic modulus at 1≦elongation in the longitudinal direction is smaller than 6004/61-, sufficient mechanical strength cannot be obtained.
また、このようなベースフィルム上に形成される磁性層
は、適度な弾性率で磁気テープの機械的強度を補強し、
かつ磁気テープの柔軟性を適度なものにして折損やカー
ルを有効に防止しヘッドタッチも良好なものにするため
、結合剤成分として分子量が50000以下のポリウレ
タン樹脂を含有させるのが好ましく、必要に応じて塩化
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、繊維素糸樹脂、インシアネート化合物など他の相
溶性のよい結合剤樹脂と併用して使用される1つ使用鎗
は他の結合剤W脂との合計量に対して20重置囁以上使
用するのが好ましく、20重量%より少ないと磁気テー
プの機械的強度を充分に補強できず、また柔軟性も適度
なものとならない。In addition, the magnetic layer formed on such a base film has an appropriate elastic modulus to reinforce the mechanical strength of the magnetic tape.
In addition, in order to make the magnetic tape moderate in flexibility, effectively prevent breakage and curling, and provide good head touch, it is preferable to include a polyurethane resin with a molecular weight of 50,000 or less as a binder component. Depending on the situation, one can be used in combination with other binder resins with good compatibility, such as vinyl chloride-vinyl acetate copolymers, polyvinyl butyral resins, fiber yarn resins, incyanate compounds, etc. It is preferable to use 20 times or more of the total weight of the W fat, and if it is less than 20% by weight, the mechanical strength of the magnetic tape cannot be sufficiently reinforced and the flexibility will not be adequate.
このようなホ゛リウレタン樹脂の具体例としては、たと
えば、成田薬品工業社製タケラックE−551T、 夕
’)−ネー)L−1007、三洋化成社11TU201
1大日本インキ化学工業社製パンデックスT5205、
バンプ7クスT5201.パンデックスT5250、日
本ポリウレタン工業社瓢コロ卓−)$4048、コシネ
ート#4095.E井東圧社製ハ・イプレン$100.
ハイプレン#167等が挙げられる。Specific examples of such polyurethane resins include Takelac E-551T, Narita Pharmaceutical Co., Ltd., L-1007, and Sanyo Chemical Co., Ltd. 11TU201.
1 Pandex T5205 manufactured by Dai Nippon Ink Chemical Industries, Ltd.
Bump 7x T5201. Pandex T5250, Nippon Polyurethane Kogyo Co., Ltd.) $4048, Cosinate #4095. Manufactured by E Itoatsusha Ha Ipren $100.
Examples include Hyprene #167.
磁性粉末としてはr −Fe、O,粉末、Fe50.粉
末、Co含有r−Fe、O,粉末、Co含有Fe5Oa
粉末、Cry。Magnetic powders include r-Fe, O, powder, Fe50. Powder, Co-containing r-Fe, O, powder, Co-containing Fe5Oa
Powder, Cry.
粉末、Fe その他の金属粉末など従来公知の磁性粉末
がいずれも使用され、また有機溶剤としては結合剤樹脂
を溶解するのに適した溶剤として通常使用されているも
の、たとえばメチルイソブチルケトン、シクロヘキサノ
ン、酢煉エチル、テトラヒドロ7ラン、ジすキサン、ト
ルエン、キシレンなどが単独で或いは二種以上混合して
使用される。Any conventionally known magnetic powder such as Fe powder, Fe or other metal powder may be used, and the organic solvent may be one that is normally used as a solvent suitable for dissolving the binder resin, such as methyl isobutyl ketone, cyclohexanone, Ethyl vinegar, tetrahydro-7rane, disoxane, toluene, xylene, etc. may be used alone or in combination of two or more.
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、研磨剤および帯電防止剤など
を任意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, and the like may be optionally added.
この発明の磁気記録媒体を製造するには常法に準じて行
なえばよく、たとえば、前記した厚みが7.0μ以下で
長手方向の1%伸びでの弾性率が600顧ろFEIII
L”以上のポリエステルフィルムなどのベースフィルム
上に、磁性粉末、分子量が50000以下のポリウレタ
ン樹脂、有m博剤およびその他の添加剤を含む磁性塗料
を吹付けもしくはロール塗りなど任意の手段で塗布し、
乾燥すればよい。The magnetic recording medium of the present invention may be manufactured according to a conventional method.
A magnetic paint containing magnetic powder, polyurethane resin with a molecular weight of 50,000 or less, magnetic additives, and other additives is applied onto a base film such as a polyester film of L" or more by any means such as spraying or roll coating. ,
Just dry it.
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
α−Fc磁性粉末80重量部
VAGH(米国U、C,C社製、塩化 14 1ビニ
ル−酢酸ビニル−ビニルアル
コール共重合#、)
タケラックE−5517(武1) 5重量部薬品工業
社製、ウレタンプレポリ
マー、分子量6000)
コロネー)L(日本ポリウレタン 11工業社製、
三官能性低分子置イン
シアネート化合物)
トルエン 60 1メチルイソブ
チルケトン 60 1の組成からなる混合物をボ
ール文ル中で72時間混合分赦して磁性塗料を調製した
。この磁性塗料を厚さが6.0μで長手方向の1%伸び
での弾性率が750 Q/rm” のポリエステルフィ
ルム上に乾燥厚が4μ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 α-Fc magnetic powder 80 parts by weight VAGH (manufactured by U, C, C, USA, vinyl chloride-vinyl acetate-vinyl alcohol copolymer #) Takelac E-5517 (Bu 1) 5 parts by weight Yakuhin Kogyo Co., Ltd. (manufactured by Nippon Polyurethane 11 Kogyo Co., Ltd., urethane prepolymer, molecular weight 6000)
A magnetic paint was prepared by mixing a mixture consisting of 60 parts of toluene and 60 parts of methyl isobutyl ketone for 72 hours in a bowl. This magnetic paint was applied to a polyester film with a thickness of 6.0μ and an elastic modulus of 750 Q/rm at 1% elongation in the longitudinal direction to a dry thickness of 4μ, dried, and surface treated. Afterwards, it was cut to a specified width to make magnetic tape.
比較例1
実施例において、実施例で使用したポリエステルフィル
ムに代えて、厚さが6.0声で長子方向の1%伸びでの
弾性率が550Q/wsuのポリエステルフィルムを使
用した以外は実施例と同様にして磁気テープをつくった
。Comparative Example 1 Example except that in place of the polyester film used in the example, a polyester film having a thickness of 6.0 degrees and an elastic modulus of 550 Q/wsu at 1% elongation in the longitudinal direction was used. I made magnetic tape in the same way.
比較V!I42
実施例における磁性塗料の組成において、タケラックE
−551Tに代えてバラプレン25S(日本ポリウレタ
ン社製、高分子皺ウレタン11i脂、分子jli760
00)を5重Ii1部使用し、また溶媒をトルエンおよ
びメチルイソブチルケトンからテトラヒドロフランとメ
チルエチルケトンそれぞれ60重置部に変更した以外は
実施例と同様にして磁気テープをつくった。Comparison V! I42 In the composition of the magnetic paint in Examples, Takelac E
-Baraprene 25S (manufactured by Nippon Polyurethane Co., Ltd., polymer wrinkled urethane 11i resin, molecular jli760) in place of -551T
A magnetic tape was prepared in the same manner as in Example, except that 1 part of 5-fold Ii (00) was used and the solvent was changed from toluene and methyl isobutyl ketone to 60 parts each of tetrahydrofuran and methyl ethyl ketone.
実施例および各比較例で得られた磁気テープについて、
感度、周波数特性および磁性層の表向粗さを測定した。Regarding the magnetic tapes obtained in Examples and Comparative Examples,
Sensitivity, frequency characteristics, and surface roughness of the magnetic layer were measured.
a外層の表面粗さは触針式表面粗さ計で測定し、表向粗
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。a The surface roughness of the outer layer was measured using a stylus type surface roughness meter, and the surface roughness values are centerline averages (C, L, A).
It was expressed as
下表はその結果である。The table below shows the results.
E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)は従来の磁気テープ(比較例1および2)
に比し、感度および周波数特性が良好でに面粗さが小さ
く、このことからこの発明によって得られる磁気記録媒
体は可及的に薄くても光分な機械的強度と適度な柔軟性
を有し、その結果として電磁変換特性が改曽されている
ことがわかる。As is clear from Table E, the magnetic tape obtained by this invention (Example) is different from the conventional magnetic tape (Comparative Examples 1 and 2).
Compared to the above, the sensitivity and frequency characteristics are good, and the surface roughness is small. Therefore, the magnetic recording medium obtained by this invention has optical mechanical strength and appropriate flexibility even though it is as thin as possible. However, it can be seen that the electromagnetic conversion characteristics are improved as a result.
Claims (1)
率が600 Q/was”以上のベースフィル上に、結
合剤成分として分子量が5oooo以下のポリウレタン
樹脂を含有する磁性層を設けてなる磁気記録媒体1. A magnetic layer containing a polyurethane resin with a molecular weight of 5oooo or less as a binder component is provided on a base fill with a thickness of 7.0μ or less and an elastic modulus of 600 Q/was” or more at 1% elongation in the longitudinal direction. magnetic recording media
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4238182A JPS58159228A (en) | 1982-03-17 | 1982-03-17 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4238182A JPS58159228A (en) | 1982-03-17 | 1982-03-17 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58159228A true JPS58159228A (en) | 1983-09-21 |
Family
ID=12634474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4238182A Pending JPS58159228A (en) | 1982-03-17 | 1982-03-17 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58159228A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62241129A (en) * | 1986-04-14 | 1987-10-21 | Teijin Ltd | Tape for magnetic recording |
JPH07326038A (en) * | 1995-06-21 | 1995-12-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
US5763046A (en) * | 1991-01-21 | 1998-06-09 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5827600A (en) * | 1991-01-21 | 1998-10-27 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6096406A (en) * | 1997-07-15 | 2000-08-01 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6203934B1 (en) | 1997-10-14 | 2001-03-20 | Fui Photo Film Co., Ltd. | Magnetic recording medium |
US6254964B1 (en) | 1997-02-10 | 2001-07-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6291052B1 (en) | 1997-06-30 | 2001-09-18 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6316077B1 (en) | 1998-06-22 | 2001-11-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6432503B2 (en) | 1997-03-31 | 2002-08-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6444290B1 (en) | 1998-06-11 | 2002-09-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions |
US6579592B1 (en) | 1996-11-29 | 2003-06-17 | Fuji Photo Film Co., Ltd | Magnetic recording tape with controlled Hc and magnetic flux/unit area value and controlled Cl/Fe intensity |
-
1982
- 1982-03-17 JP JP4238182A patent/JPS58159228A/en active Pending
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62241129A (en) * | 1986-04-14 | 1987-10-21 | Teijin Ltd | Tape for magnetic recording |
US6015602A (en) * | 1991-01-21 | 2000-01-18 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6020022A (en) * | 1991-01-21 | 2000-02-01 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5985408A (en) * | 1991-01-21 | 1999-11-16 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6025082A (en) * | 1991-01-21 | 2000-02-15 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5811172A (en) * | 1991-01-21 | 1998-09-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5811166A (en) * | 1991-01-21 | 1998-09-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5827600A (en) * | 1991-01-21 | 1998-10-27 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5851622A (en) * | 1991-01-21 | 1998-12-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5763046A (en) * | 1991-01-21 | 1998-06-09 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5792543A (en) * | 1991-04-25 | 1998-08-11 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US5780141A (en) * | 1991-04-25 | 1998-07-14 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
JPH07326038A (en) * | 1995-06-21 | 1995-12-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
US6579592B1 (en) | 1996-11-29 | 2003-06-17 | Fuji Photo Film Co., Ltd | Magnetic recording tape with controlled Hc and magnetic flux/unit area value and controlled Cl/Fe intensity |
US6254964B1 (en) | 1997-02-10 | 2001-07-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6432503B2 (en) | 1997-03-31 | 2002-08-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6291052B1 (en) | 1997-06-30 | 2001-09-18 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6096406A (en) * | 1997-07-15 | 2000-08-01 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
US6203934B1 (en) | 1997-10-14 | 2001-03-20 | Fui Photo Film Co., Ltd. | Magnetic recording medium |
US6444290B1 (en) | 1998-06-11 | 2002-09-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions |
US6316077B1 (en) | 1998-06-22 | 2001-11-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
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