JPS6314321A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS6314321A JPS6314321A JP15805286A JP15805286A JPS6314321A JP S6314321 A JPS6314321 A JP S6314321A JP 15805286 A JP15805286 A JP 15805286A JP 15805286 A JP15805286 A JP 15805286A JP S6314321 A JPS6314321 A JP S6314321A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- back coat
- vinyl chloride
- magnetic
- weight
- 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
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims abstract description 22
- 125000003700 epoxy group Chemical group 0.000 claims abstract description 17
- 239000010410 layer Substances 0.000 claims description 58
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 19
- 239000011247 coating layer Substances 0.000 claims description 7
- 230000006866 deterioration Effects 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract 2
- 238000004299 exfoliation Methods 0.000 abstract 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 18
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 12
- 239000003973 paint Substances 0.000 description 11
- 239000006229 carbon black Substances 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 8
- 238000006116 polymerization reaction Methods 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229920005749 polyurethane resin Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000012046 mixed solvent Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 3
- 229920006287 phenoxy resin Polymers 0.000 description 3
- 239000013034 phenoxy resin Substances 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- -1 fatty acid ester Chemical class 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
本発明は、例えばビデオ用、オーディオ用又はコンピュ
ータ用の磁気テープ等の磁気記録媒体に関するものであ
る。The present invention relates to a magnetic recording medium such as a magnetic tape for video, audio, or computer use.
磁気テープ等の磁気記録媒体にあっては、例えば高周波
領域での出力改善の為に磁性層の表面は平滑であること
が求められている。
しかし、磁性層の表面平滑性を高めた磁気テープは、磁
気テープの巻き取り及び巻き戻しに際して整然とは巻か
れないことが起き、すなわち巻包状態となることがしば
しばある。そして、このような巻包状態の起きた磁気テ
ープに対して記録再生を行なうと、張力変動によって磁
気テープの走行性が悪く、従って出力の変動が起きる等
記録再生特性が低下する。又、磁気テープの変形、損傷
等も起こりやすい欠点がある。
このような欠点を解決する為に、磁性層と反対側の支持
体の面に、いわゆるバックコート層を設けることが提案
されている。
すなわち、バックコート層を設けることによって磁気テ
ープの走行性を改善し、もって記録再生特性の向上を図
り、又、磁気テープの変動や４；’１ ｔｓを起きに＜
＜シようとするものである。
そして、このような観点より、バックコート層を構成す
る主成分であるバインダとして塩化ビニル−酢酸ビニル
共重合体が用いられてきたが、この塩化ビニル−酢酸ビ
ニル共重合体をバインダとして構成したバックコート層
を設けた磁気テープは、バックコート層の耐掌耗性及び
強靭性等が悪く、走行耐久性に悪影響ひ及ぼし、摩擦係
数の増大、磁気テープの折れ等が起きやすい問題点が残
されていた。
又、−ｍに、磁気テープの走行性や走行耐久性の改善を
目的としてバラフコ−１・層と設けたものにあっては、
バックコート１１の凹凸が磁性層表面に転写され、この
結果磁性層の表面性が損なわれ、磁気記録媒体の電磁変
換特性が低下するようになる欠点がある。
そこで、このような欠点を解決するものとして、例えば
特開昭５８−２００４２６号公報で示されるように、バ
ックコート層を構成するバインダをフェノキシ樹脂、熱
可塑性ポリウレタンエラストマー及びポリイソシアネー
トで構成することが提案されている。
しかし、本発明者の研究によれば、このようなバインダ
を用いてバックコート層を構成した磁気記録媒体にあっ
ても、前記の問題点が充分に解決されていないことが次
第に判ってきた。In magnetic recording media such as magnetic tapes, the surface of the magnetic layer is required to be smooth in order to improve output in a high frequency range, for example. However, when the magnetic tape has a magnetic layer with improved surface smoothness, it often happens that the magnetic tape is not wound in an orderly manner when it is wound up and unwound, that is, it often ends up in a wrapped state. When recording and reproducing are performed on a magnetic tape in which such a wrapping state has occurred, the running properties of the magnetic tape are poor due to tension fluctuations, and therefore the recording and reproducing characteristics are deteriorated, such as fluctuations in output. Another disadvantage is that the magnetic tape is easily deformed and damaged. In order to solve these drawbacks, it has been proposed to provide a so-called back coat layer on the surface of the support opposite to the magnetic layer. That is, by providing a back coat layer, the running properties of the magnetic tape are improved, thereby improving the recording and reproducing characteristics, and it is also possible to prevent fluctuations in the magnetic tape and 4;'1 ts.
<I am trying to do this. From this point of view, vinyl chloride-vinyl acetate copolymer has been used as the binder, which is the main component constituting the back coat layer. Magnetic tapes with a coating layer have problems such as poor palm abrasion resistance and toughness of the back coating layer, which adversely affects running durability, increases the coefficient of friction, and tends to cause the magnetic tape to break. was. In addition, in cases where -m is provided with Barafco-1 layer for the purpose of improving the running properties and running durability of the magnetic tape,
There is a disadvantage that the irregularities of the back coat 11 are transferred to the surface of the magnetic layer, resulting in a loss of surface properties of the magnetic layer and a deterioration of the electromagnetic conversion characteristics of the magnetic recording medium. Therefore, as a solution to these drawbacks, for example, as shown in Japanese Patent Application Laid-open No. 58-200426, the binder constituting the back coat layer may be composed of phenoxy resin, thermoplastic polyurethane elastomer, and polyisocyanate. Proposed. However, according to the research conducted by the present inventors, it has gradually become clear that even in magnetic recording media in which the back coat layer is formed using such a binder, the above-mentioned problems have not been satisfactorily solved.
本発明者は、種々の樹脂をバインダとして用いたバック
コート層を構成した磁気記録媒体の特性を研究していく
うちに、エポキシ基と分子内に有する塩化ビニル系樹脂
をバインダとして用い゛た磁気記録媒体は、バックコー
ト層の表面凹凸の転写による磁性層の表面性低下に起因
した電磁変換特性の低下がなく、しかもこのバックコー
ト層の傷付きは極めて少なく、又、バックコート層表面
の動ｆ！Ｊ擦係数は小さく、又、走行路にあるガイドビ
ンに汚れが起きにくいといったように、バックコート層
の耐久性に優れ、かつ走行性が良く、さらには高温多湿
下に保存されていてもこのバックコート層が突貫しにく
くて、剥がされにくいものであることを見出し、本発明
を成し遂げたのである。
すなわち、本発明は、支持休め一面側に磁性層を、他面
側にエポキシ基を有する塩化ビニル系樹脂の塗膜層を設
けた磁気記録媒体を提供するもので鳥ろ。
尚、上記の塩化ビニル系樹脂におけるエポキシ基の含有
量は、この塩化ビニル系樹脂の約０５〜４０重量％であ
ることが望ましいものである。すなわち、エポキシ基が
０．５重量％よりはるかに少なくなりすぎると、この塩
化ビニル系樹脂をバインダとして構成したバックコート
層の耐久性及び熱安定性の特長が小さくなり、又、エポ
キシ基が４０重景％を越えて多くなりすぎると、この塩
化ビニル系樹脂をバインダとして構成したバックコート
層の剥離が認められ出すようになり、又、走行性も低下
するようになるからである。
又、このような塩化ビニル系樹脂は、その平均重合度が
約２００〜６００、より好ましくは約３００〜４００で
あることが望ましい、すなわち、重き度が小さすぎるも
のでは、磁性層の耐久性の改善効果が弱く、ス、重合度
が大きすぎるものでは、これを含むバックコートＭ楕成
用の塗料の流動性の改善効果が弱くなるからである。
このバックコート層の主たる成分は上記分子内にエポキ
シ基を有する塩化ビニル系樹脂であるが、このバックコ
ート層中に例えばカーボンブラック等を含ませておくと
一層好都合なものである。
すなわち、磁気記録媒体の帯電防止及び光遮蔽を目的と
して、磁性層中にカーボンブラックを含まぜることが行
なわれているのであるが、このようにすると磁性層中に
おける磁性粉の充填率はそれだけ低下し、高密度記録に
対応できなくなる。
そこで、バックコート層中にカーボンブラックを含ませ
ることによって磁性層中におけるカーボンブラック含有
量を減らし、磁性粉の充填率の向上を図ることが考えら
れたのである。
尚、カーボンブラックは、一般に′ａ集が起きやすく、
分散性が悪いことから、カーボンブラックを添加する場
合にあっては、カーボンブラック１００重量部に対して
脂肪酸、脂肪酸エステル等の分散剤を約０．２〜５重量
重量部加えることが望ましい。
又、上記カーボンブラックの外に、必要に応じて炭酸カ
ルシウム、酸化チタン、硫酸バリウム等の無ｌｌｌ物粒
子をバックコート層中に含ませていても良いものである
。While researching the characteristics of magnetic recording media in which back coat layers were constructed using various resins as binders, the present inventor discovered a magnetic recording medium using a vinyl chloride resin having an epoxy group and a vinyl chloride resin in the molecule as a binder. The recording medium does not have deterioration in electromagnetic conversion characteristics caused by deterioration of the surface properties of the magnetic layer due to transfer of surface irregularities of the back coat layer, has very few scratches on the back coat layer, and is free from movement on the surface of the back coat layer. f! The J-friction coefficient is small, and the back coat layer has excellent durability and runnability, as shown by the fact that the guide bins on the running path are hard to get dirty, and even when stored under high temperature and humidity. The present invention was achieved by discovering that the back coat layer is difficult to penetrate and is difficult to peel off. That is, the present invention provides a magnetic recording medium in which a magnetic layer is provided on one side of a support plate and a coating layer of a vinyl chloride resin having an epoxy group is provided on the other side. The content of epoxy groups in the vinyl chloride resin is preferably about 05 to 40% by weight of the vinyl chloride resin. In other words, if the amount of epoxy groups is much less than 0.5% by weight, the durability and thermal stability of the back coat layer composed of this vinyl chloride resin as a binder will be reduced. If the amount exceeds the heavy weight percentage, peeling of the back coat layer made of vinyl chloride resin as a binder will begin to be observed, and running properties will also deteriorate. In addition, it is desirable that such vinyl chloride resin has an average degree of polymerization of about 200 to 600, more preferably about 300 to 400. In other words, if the degree of polymerization is too small, the durability of the magnetic layer will be affected. This is because if the improving effect is weak and the degree of polymerization is too high, the effect of improving the fluidity of the back coat M-forming paint containing it will be weak. The main component of this back coat layer is the vinyl chloride resin having an epoxy group in the molecule, but it is more convenient to include carbon black or the like in this back coat layer. In other words, carbon black is included in the magnetic layer for the purpose of preventing static electricity and shielding light from magnetic recording media, but this reduces the filling rate of magnetic powder in the magnetic layer accordingly. This makes it impossible to support high-density recording. Therefore, it was considered to include carbon black in the back coat layer to reduce the carbon black content in the magnetic layer and improve the filling rate of magnetic powder. In addition, carbon black generally tends to cause 'a aggregation,
Since the dispersibility is poor, when carbon black is added, it is desirable to add about 0.2 to 5 parts by weight of a dispersant such as fatty acid or fatty acid ester to 100 parts by weight of carbon black. In addition to the above-mentioned carbon black, inorganic particles such as calcium carbonate, titanium oxide, barium sulfate, etc. may be included in the back coat layer, if necessary.
【実施例１】
ＣＯ含有量−Ｆｅ２０ｉ磁性粉１００重盟部、塩化ビニ
ル−酢酸ビニル−ビニルアルコール共重合体１６重量部
、ポリウレタン樹脂１６重量部、平均粒径０．３μｌの
Ｃｒ２０＝ ２重量部、ステアリン酸ブチル２重量部、
シクロヘキサノンとトルエンとの等旦混合溶剤３００重
量部をサンドミルで所定時間混合分散して磁性塗料を作
り、この磁性塗料にポリイソシアネート（日本ポリウレ
タン工業（株）製のコロネートＬ）８重量部を添加し、
これをポリエステルフィルム等の非磁性の支持体の一面
に塗布し、乾燥後カレンダー処理する。
次に、平均粒径８０−μで比表面積５０ｎ”／Ｈのカー
ボンブラック１００重量部、エポキシ基（３０ｆｆｉ量
％）分有する平均重合度３００の塩化とニル−メタグリ
シジルエーテル共重合体６０重量部、ポリウレタン樹脂
４０重量部、オレイン酸１．３重量部、シクロヘキサノ
ンとトルエンとの等量混合溶剤５００重量部をサンドミ
ルで所定時間混合分散してバックコート層用の塗料を作
り、さらにこれにコロネートし１５重量部を添加し、こ
れを上記非磁性の支持体の他面に約１．０μ鴎厚塗布し
、乾燥後１７２インチ巾にスリットしてビデオ用磁気テ
ープ等の磁気記録媒体３得る。[Example 1] CO content - 100 parts by weight of Fe20i magnetic powder, 16 parts by weight of vinyl chloride-vinyl acetate-vinyl alcohol copolymer, 16 parts by weight of polyurethane resin, 2 parts by weight of Cr20 with an average particle size of 0.3 μl , 2 parts by weight of butyl stearate,
A magnetic paint was prepared by mixing and dispersing 300 parts by weight of a mixed solvent of cyclohexanone and toluene for a predetermined time using a sand mill, and 8 parts by weight of polyisocyanate (Coronate L manufactured by Nippon Polyurethane Industries, Ltd.) was added to this magnetic paint. ,
This is applied to one side of a non-magnetic support such as a polyester film, dried and then calendered. Next, 100 parts by weight of carbon black having an average particle size of 80 μm and a specific surface area of 50 n”/H, and 60 parts by weight of a chloride-metaglycidyl ether copolymer having an average degree of polymerization of 300 and having an epoxy group (30ffi weight %) content. , 40 parts by weight of polyurethane resin, 1.3 parts by weight of oleic acid, and 500 parts by weight of a mixed solvent of equal amounts of cyclohexanone and toluene were mixed and dispersed in a sand mill for a predetermined period of time to prepare a paint for the back coat layer, and this was further coronated. 15 parts by weight is added, and this is applied to the other surface of the non-magnetic support to a thickness of about 1.0 μm, and after drying, it is slit into a width of 172 inches to obtain a magnetic recording medium 3 such as a magnetic tape for video.
【実施例２】
実施例１におけるバラフコ−１一層用の塗料の組成物を
、平均粒径８０ｍμで比表面積５０＋ｅ２／Ｈのウーボ
ンブラック１００重呈部、エポキシ基（３，０重１％）
を有する平均重合度３５０の塩化ビニル−グリシジルメ
タクリレート共重合体５０重量部、ポリウレタン樹脂５
０重量部、ステアリン酸ブチル２重量部、シクロヘキサ
ノンとトルエンとの等量混合溶剤５００重量部として同
様に行ない、磁気記録媒体を得る。[Example 2] The composition of the paint for one layer of Barafco-1 in Example 1 was prepared using 100 parts of woobon black with an average particle size of 80 mμ and a specific surface area of 50+e2/H, and an epoxy group (3.0 wt. 1%).
50 parts by weight of a vinyl chloride-glycidyl methacrylate copolymer with an average degree of polymerization of 350, and 5 parts by weight of a polyurethane resin.
The same procedure was carried out using 0 parts by weight, 2 parts by weight of butyl stearate, and 500 parts by weight of a mixed solvent of equal amounts of cyclohexanone and toluene to obtain a magnetic recording medium.
【実施例３】
実施例１におけるバックコート層用の塗料の組成物を、
平均粒径０．２μｍの炭酸カルシウム粉末１００重量部
、エポキシ基（１，５重量％）を有する平均重合度４０
０の塩化ビニル−グリシジルアクリレート共重合体５０
重量部、ポリウレタン樹脂５０重量部、シクロヘキサノ
ンとトルエンとの等量混合溶剤５００重量部として同様
に行ない、磁気記録媒体を得る。[Example 3] The composition of the paint for the back coat layer in Example 1 was
100 parts by weight of calcium carbonate powder with an average particle size of 0.2 μm, average degree of polymerization 40 with epoxy groups (1.5% by weight)
0 vinyl chloride-glycidyl acrylate copolymer 50
The same procedure is carried out using 50 parts by weight of the polyurethane resin and 500 parts by weight of a mixed solvent of equal amounts of cyclohexanone and toluene to obtain a magnetic recording medium.
【実施例４】
実施例１におけるバックコート層用の塗料の組成物を、
平均粒径０．２μ−の炭酸カルシウム１００重量部、エ
ポキシ基（１０重量％）を有する平均重合度３５０の塩
化ビニル−ブタジェンモノオキサイド共重合体５０重量
部、ポリウレタン樹脂５０重量部、シクロヘキサノンと
トルエンとの等量混合溶剤５００重量部として同様に行
ない、磁気記録媒体を得る。[Example 4] The composition of the paint for the back coat layer in Example 1 was
100 parts by weight of calcium carbonate with an average particle size of 0.2μ, 50 parts by weight of a vinyl chloride-butadiene monooxide copolymer with an average degree of polymerization of 350 having an epoxy group (10% by weight), 50 parts by weight of a polyurethane resin, and cyclohexanone. A magnetic recording medium is obtained by carrying out the same procedure using 500 parts by weight of a solvent mixed with toluene in an equal amount.
【実施例５】
実施例１におけるバックコート層用の塗料の組成物を、
平均粒径０．３μ論の二酸化チタン８０重量部、エポキ
シ基（５重量％）を有する平均重合度４００の塩１ヒビ
ニルーグリシジルアクリレート共重合本４５重量部、ポ
リウレタン樹脂５５重量部、シクロヘキサノンとトルエ
ンとの等量混合溶剤５００重量部として同様に行ない、
磁気記録媒体を得る。[Example 5] The composition of the paint for the back coat layer in Example 1 was
80 parts by weight of titanium dioxide with an average particle size of 0.3μ, 45 parts by weight of a salt 1-hibinyl-glycidyl acrylate copolymer with an average degree of polymerization of 400 having an epoxy group (5% by weight), 55 parts by weight of a polyurethane resin, cyclohexanone and toluene. The same procedure was carried out using 500 parts by weight of a mixed solvent in equal amounts with
Obtain a magnetic recording medium.
【比較例１】
実施例１のバックコート層用の塗料における塩化ビニル
系樹脂を、塩化ビニル−酢酸ビニル−ビニルアルコール
共重合体として同様に行ない、磁気記録媒体な得る。Comparative Example 1 A magnetic recording medium was obtained in the same manner as in Example 1 by replacing the vinyl chloride resin in the paint for the back coat layer with a vinyl chloride-vinyl acetate-vinyl alcohol copolymer.
【比較例２】
実施例１のバックコート層用の塗料における塩１ヒビニ
ル系樹脂を、塩化ビニル−酢酸ビニル共重合体として同
様に行ない、磁気記録媒体を得る。[Comparative Example 2] A magnetic recording medium was obtained in the same manner as in Example 1, except that the vinyl chloride-vinyl acetate copolymer was used instead of the vinyl salt 1-hibinyl resin in the paint for the back coat layer.
【比較例３】
実施例１のバックコート層用の塗料における塩化ビニル
系樹脂をフェノキシ樹脂に代えて同様に行ない、磁気記
録媒体を得る。Comparative Example 3 A magnetic recording medium was obtained by carrying out the same procedure as in Example 1 except that the vinyl chloride resin in the paint for the back coat layer was replaced with a phenoxy resin.
上記各側で得た磁気記録媒体について、温度２０℃、湿
度１０％の環境下で同一箇所を繰り返して５００回走行
させた後のバックコート層の傷付き具合、及び走行路に
あるガイドビンの汚れ具合、さらにはバックコート層の
動摩擦係数μｋ並びに繰り返し走行面の動１ツ擦係数μ
に０、及び温度６０℃、湿度９０％の環境下に３００時
間保存した後におけるバックコート層の剥離具合を調べ
たので、その結果を表に示す。
ス、上記各側の磁気記録媒体を記録再生装置に装着し、
ＦＦ−ＲＥＷを常温下において繰り返して行なった際に
おけるリールモータにががる電圧３調べたので、その結
果３グラフとして図面に示す。
これによれば、本実施例の磁気記録媒体は、繰り返して
走行させてもバックコート層の傷付は小さく、又、走行
路にあるガイドビンの汚れは無く、バックコート層の耐
久性及び耐摩耗性に優れており、又、高温多湿下に置か
れてもバックコート層ハ：Ｔｈｌ Ｎ Ｌ Ｃ： ＜
＜ 、 バックコート層の熱安定性に優れており、又、
動摩擦係数が小さいのみならず、繰り返し走行後にあっ
ても動摩擦係数の変動が小さく、がっ、リールモータに
ががる電圧が小さく、しかも安定しているように、走行
性及び走行安定性に富んでおり、記録再生特性に優れて
いる。
これに対して、バックコート層のバインダとして塩化ビ
ニル系樹脂が用いられても、この塩化ビニル系樹脂がエ
ポキシ基を有していない比較例１゜２のものでは、バッ
クコート層の傷付き具合が大きく、又ガイドビンの汚れ
も有るようにバックコート層の耐久性及び耐摩耗性は悪
く、又、動Ｒ１１擦酩数が大すく、がっ、リールモータ
にががる電圧は少しの繰り返し走行によって大きくなり
、磁気記録媒体の走行性は悪く、記録再生特性が悪いも
のになり、又、バックコート層の！ＩＪ Ｍが多いこと
からバックコート層の熱安定性が悪く、又、塩化ビニル
系樹脂の代りにフェノキシ樹脂を用いてら、本実施例の
ものよりバックコート層の耐久性、熱安定性、走行性は
劣るものである。
又、本実施例の磁気記録媒体にあっては、バックコート
層の表面凹凸が磁性層表面に転写され、磁性層の表面平
滑性が大巾に低下し、電磁変換特性が低下するに至ると
いった欠点はないものであった。For the magnetic recording media obtained on each side above, the degree of damage to the back coat layer after running 500 times at the same location under an environment of temperature 20°C and humidity 10%, and the damage of the guide bin on the running path. The degree of dirt, as well as the dynamic friction coefficient μk of the back coat layer and the dynamic friction coefficient μ of the repeated running surface.
The degree of peeling of the back coat layer after storage for 300 hours in an environment with a temperature of 60° C. and a humidity of 90% was investigated, and the results are shown in the table. Attach the magnetic recording media on each side to the recording/reproducing device,
The voltage across the reel motor when FF-REW was repeatedly performed at room temperature was investigated, and the results are shown in the drawing as three graphs. According to this, in the magnetic recording medium of this example, even if the back coat layer is repeatedly run, there is little damage to the back coat layer, there is no dirt on the guide bin in the running path, and the back coat layer is durable and resistant. It has excellent abrasion resistance, and even when placed under high temperature and humidity, the back coat layer C:ThlNLC:<
< , The back coat layer has excellent thermal stability, and
Not only is the coefficient of dynamic friction small, but even after repeated running, the fluctuation of the coefficient of dynamic friction is small, and the voltage applied to the reel motor is small and stable, so it has excellent running performance and running stability. It has excellent recording and reproducing characteristics. On the other hand, even if a vinyl chloride resin is used as a binder for the back coat layer, in Comparative Examples 1 and 2, in which the vinyl chloride resin does not have an epoxy group, the degree of damage to the back coat layer is The durability and abrasion resistance of the back coat layer are poor, as the guide bin is dirty, and the dynamic R11 friction number is large, and the voltage applied to the reel motor is slightly repeated. The size of the back coat layer increases due to running, resulting in poor running properties of the magnetic recording medium and poor recording/reproducing characteristics. Since the amount of IJM is large, the thermal stability of the back coat layer is poor, and when phenoxy resin is used instead of vinyl chloride resin, the durability, thermal stability, and runnability of the back coat layer are lower than those of this example. is inferior. In addition, in the magnetic recording medium of this example, the surface irregularities of the back coat layer are transferred to the surface of the magnetic layer, and the surface smoothness of the magnetic layer is greatly reduced, leading to a decrease in electromagnetic conversion characteristics. There were no flaws.
本発明に係る磁気記録媒体は、支持体の一面側に磁性層
を、他面側にエポキシ基を有する塩化ビニル系樹脂の塗
膜層を設けなので、磁気記録媒体の走行性が良くなり、
そしてこの塗膜層は傷付きが少なく、がっ、走行路にあ
るガイドビンの汚れは少なくて耐久性に富んでおり、又
、この塗膜層は高温多湿下におかれてぃてもシｊがれに
くくて熱安定性に富んでおり、又、エポキシ基を有する
塩化ビニル系樹脂の塗膜層の表面凹凸が磁性層表面に転
写され、磁性層の表面平滑性が損われて電磁変換特性が
低下する欠点はない笠の特長を有する。Since the magnetic recording medium according to the present invention has a magnetic layer on one side of the support and a coating layer of a vinyl chloride resin having an epoxy group on the other side, the running properties of the magnetic recording medium are improved.
This coating layer is less susceptible to scratches, and the guide bins on the driving path are less likely to get dirty, making it highly durable. j It is hard to peel and has high thermal stability, and the surface irregularities of the vinyl chloride resin coating layer with epoxy groups are transferred to the surface of the magnetic layer, impairing the surface smoothness of the magnetic layer and preventing electromagnetic conversion. It has the features of a cap without any drawbacks such as deterioration of characteristics.
図面は、磁気記録媒体を記録再生装置に装着し、ＦＦ−
ＲＥＷを繰り返して行なった際におけるリールモータに
かかる電圧と繰り遅し回数との関係を示すグラフである
。
繰り返し回数The drawing shows a magnetic recording medium installed in a recording/reproducing device and an FF-
It is a graph showing the relationship between the voltage applied to the reel motor and the number of repeat delays when REW is repeatedly performed. Number of repetitions
Claims (1)
る塩化ビニル系樹脂の塗膜層を設けたことを特徴とする
磁気記録媒体。A magnetic recording medium characterized in that a magnetic layer is provided on one side of a support, and a coating layer of a vinyl chloride resin having an epoxy group is provided on the other side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15805286A JPS6314321A (en) | 1986-07-07 | 1986-07-07 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15805286A JPS6314321A (en) | 1986-07-07 | 1986-07-07 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6314321A true JPS6314321A (en) | 1988-01-21 |
Family
ID=15663240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15805286A Pending JPS6314321A (en) | 1986-07-07 | 1986-07-07 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6314321A (en) |
-
1986
- 1986-07-07 JP JP15805286A patent/JPS6314321A/en active Pending
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