JPS62183030A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62183030A JPS62183030A JP2301986A JP2301986A JPS62183030A JP S62183030 A JPS62183030 A JP S62183030A JP 2301986 A JP2301986 A JP 2301986A JP 2301986 A JP2301986 A JP 2301986A JP S62183030 A JPS62183030 A JP S62183030A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- magnetic recording
- back coat
- integer
- 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
- 150000001875 compounds Chemical class 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims description 10
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 abstract 2
- 229930195733 hydrocarbon Natural products 0.000 abstract 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract 2
- 229910003145 α-Fe2O3 Inorganic materials 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 9
- 239000006247 magnetic powder Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- -1 or zomaryl Chemical group 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000002511 behenyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 125000005313 fatty acid group Chemical group 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 125000001117 oleyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])/C([H])=C([H])\C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 125000005471 saturated fatty acid group Chemical group 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 125000005314 unsaturated fatty acid group Chemical group 0.000 description 1
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
本発明は、例えば磁気テープ又は磁気ディスク等の磁気
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 or a magnetic disk.
近年、ビデオ用磁気テープ等の磁気記録媒体の研究開発
は盛に行なわれており、その成果として電磁変換特性の
向上は著しいものである。
ところが、この電磁変換特性の向上は磁気記録媒体の支
持体の表面平滑性と密接に関係しており、すなわち電磁
変換特性の向上は支持体の表面平滑性を向上させること
によって得られているものである為、この結果、耐摩耗
性の低下及び走行性の低下を来たしている。
そこで、このような問題点を解決する為に、磁性層と反
対側の支持体面上に、いわゆるバックコート層を設け、
さらにこのバックコート層中に非磁性物質を混入してお
くことが提案されている。
しかし、これまでの提案のものでは充分なものと言えず
、特に低温条件での編り返し走行が行なわれると、ガイ
ドピン等への傷付が多く、又、走行安定性が悪い欠点が
ある。In recent years, research and development of magnetic recording media such as video magnetic tapes has been actively conducted, and as a result of this research, the electromagnetic conversion characteristics have been significantly improved. However, this improvement in electromagnetic conversion characteristics is closely related to the surface smoothness of the support of the magnetic recording medium; in other words, improvement in electromagnetic conversion characteristics is achieved by improving the surface smoothness of the support. As a result, the wear resistance and runnability are lowered. Therefore, in order to solve this problem, a so-called back coat layer is provided on the support surface opposite to the magnetic layer.
Furthermore, it has been proposed to mix a nonmagnetic substance into this back coat layer. However, the proposed methods so far cannot be said to be sufficient, especially when running in low-temperature conditions, the guide pins are often damaged, and the running stability is poor. .
本発明者は、いわゆるバックコート層が設けられた磁気
記録媒体におけるバックコート層含有成分についての研
究を押し進めた結果、例えばα−Ｆｅ２０ｚ、Δ１ｍＱ
、、Ｔｉ０１Ｔｉ０２、Ｃｒ２０＝等のモース硬度５以
上の非磁性物質と下記の一般式［＾］で表わされる化合
物をバックコート層中に含ませておくと、この磁気記録
媒体は、低温から高温に至る広い環境条件下でも走行性
が良く、かつ走行経路におけるガイドビン等への傷付も
ないことを見い出した。
（ＣＬ）−−ｍ−ｎ
■
Ｆ（ＣＦ−）ｋ （ＣＨ２Ｈ！ ５ｉ−（ＯＣＯＲＩ）
１１（ＯＲｔ）ｎ ［Δコ
（但し、Ｒ８は炭素数７〜２１の飽和又は不飽和の１価
炭化水素基、Ｒ２は炭素数１〜４の飽和の１価炭化水素
基、ｋは１〜１２の整数、ｌは２〜６の整数、腸は１又
は２、ｎは １又は２、＋ｗ＋ｎ≦３）すなわち、バッ
クコート層中に含有せしめられる上記一般式［＾コで表
わされる化合物は、例えばポリウレタン等のバインダと
の相溶性に優れ、又、高温多湿といった条件下でも分解
することなく、化学的安定性に富んでおり、そして磁気
記録媒体の走行性を良好ならのとし、特に低温下におい
でも滑性効果に優れていて、走行性を良好なものとする
ことを見い出したのである。
つまり、一般式［Δ］で表わされる化合物は、その分子
中にバインダ成分との親和性に優れた脂肪酸基を有して
いるので、バインダ成分との相溶性が良く、特にＲ、Ｃ
ＯＯが例えばカプリル、カプリシ、ラウリル、ミリスチ
ル、パルミチル、ステアリル、ベヘニル等の飽和脂肪酸
残基、又はゾーマリル、オレイル、リノール、リルン、
ガドレイル専の不飽和脂肪酸残基といったように、Ｒ１
はその炭素数が７〜２１の飽和又は不飽和の】価の炭化
水素基であるので、低温から高温に至る広い条件下でも
滑性に優れている。
尚、Ｒ１の炭素数が６以下の場合には、高温下での滑性
が不充分なものとなり、又、Ｒ１の炭素数が２２以上の
場合には、バインダ成分との相溶性が悪く、かつ低温下
での滑性が不充分であり、しかもバックコート層の耐久
性が低下するようになる。
又、−ｍ式［＾］におけるＲ７の炭素数が５以上のもの
になると、この一般式［＾］で表わされる化合物とバイ
ンダ成分との相溶性が低下し、この化合物の分散性が悪
くなって、滑性効果を効果的に発揮させられにくくなる
ことより、Ｒ２は、その炭素数が１〜４の飽和の１価炭
化水素基であることが重要である。
又、一般式［Ａコにおけるｋは１〜１２の整数、ｌは２
〜６の整数、鶴は１又は２、ｎは１又は２、鴎＋ｎ≦３
の条件を満たすものである必要がある。
すなわち、ｋ、ｊ！、ｍ、ｎが大きくなりすぎると、つ
まり一般式［＾］で表わされる化合物の分子量が大きく
なりすぎると、バインダ成分との相溶性が悪くなり、こ
の化合物の分散性が悪く、滑性効果を効果的に発揮させ
られにくくなるからである。
さらに、バックコート層中に、上記一般式［＾］で表わ
される化合物のみでなく、モース硬度５以上の非磁性粉
末をも含ませておくと、これら両者の相乗作用によって
一層良好なものとなる。
尚、非磁性粉末と一般式［＾］で表わされる化合物がバ
ックコート層中に含有させられるにし、でも。
この非磁性粉末のモース硬度が５よりかなり小さなもの
である場合には、非磁性粉末を含まない場合よりもかえ
って悪いものとなるので、非磁性粉末のモース硬度は約
５以上のものでなければならない。
尚、上記一般式［＾］で表わされる化合物は、バックコ
ート層を構成するバインダに対して約０．５〜４．５重
量％であることが望ましく、又、モース硬度約５以上の
非磁性物質は、非磁性物質／バインダが約１７１０〜１
０／１（重量比）であることが望ましい、又、上記一般
式［＾］で表わされる化合物及びモース硬度約５以上の
非磁性物質を含有するバインダ層からなるバックコート
層の厚みは、約０．５〜４μｍ程度であることが望マシ
、く、又、モース硬度約５以上の非磁性物質の粒Ｈ（よ
約０ 、０ ！ −１，２μｍのものであることが望
ましい。As a result of conducting research on the components contained in the back coat layer in a magnetic recording medium provided with a so-called back coat layer, the present inventor discovered that, for example, α-Fe20z, Δ1mQ
, , Ti01Ti02, Cr20=, etc., which have a Mohs hardness of 5 or more, and a compound represented by the following general formula [^] are included in the back coat layer, and this magnetic recording medium can withstand temperatures from low to high temperatures. It has been found that the vehicle has good running performance even under a wide range of environmental conditions, and does not damage guide bins or the like along the running route. (CL)--m-n ■ F(CF-)k (CH2H! 5i-(OCORI)
11(ORt)n [Δko (where R8 is a saturated or unsaturated monovalent hydrocarbon group having 7 to 21 carbon atoms, R2 is a saturated monovalent hydrocarbon group having 1 to 4 carbon atoms, and k is 1 to 4 carbon atoms) 12 integer, l is an integer from 2 to 6, intestine is 1 or 2, n is 1 or 2, +w+n≦3) That is, the compound represented by the above general formula [^] contained in the back coat layer is: For example, it has excellent compatibility with binders such as polyurethane, does not decompose even under high temperature and high humidity conditions, has high chemical stability, and has good runnability of magnetic recording media, especially at low temperatures. They discovered that it has excellent lubricity in terms of odor and provides good running performance. In other words, the compound represented by the general formula [Δ] has a fatty acid group in its molecule that has excellent affinity with the binder component, so it has good compatibility with the binder component, especially R, C
OO is, for example, a saturated fatty acid residue such as capryl, caprici, lauryl, myristyl, palmityl, stearyl, behenyl, or zomaryl, oleyl, linole, lilune,
R1, such as unsaturated fatty acid residues exclusively for Gadreil.
Since it is a saturated or unsaturated valent hydrocarbon group having 7 to 21 carbon atoms, it has excellent lubricity even under a wide range of conditions from low to high temperatures. If the number of carbon atoms in R1 is 6 or less, the lubricity at high temperatures will be insufficient, and if the number of carbon atoms in R1 is 22 or more, the compatibility with the binder component will be poor. In addition, the lubricity at low temperatures is insufficient, and the durability of the back coat layer is reduced. In addition, when the number of carbon atoms in R7 in -m formula [^] is 5 or more, the compatibility between the compound represented by this general formula [^] and the binder component decreases, and the dispersibility of this compound deteriorates. Therefore, it is important that R2 is a saturated monovalent hydrocarbon group having 1 to 4 carbon atoms, since this makes it difficult to effectively exhibit the lubricating effect. In addition, in the general formula [A, k is an integer of 1 to 12, l is 2
An integer of ~6, a crane is 1 or 2, n is 1 or 2, a seagull + n≦3
It must meet the following conditions. That is, k, j! , m, and n become too large, that is, when the molecular weight of the compound represented by the general formula [^] becomes too large, the compatibility with the binder component becomes poor, the dispersibility of this compound is poor, and the lubricating effect is impaired. This is because it becomes difficult to perform effectively. Furthermore, if the back coat layer contains not only the compound represented by the above general formula [^] but also a non-magnetic powder with a Mohs hardness of 5 or more, the synergistic effect of these two will make it even better. . Incidentally, even though the non-magnetic powder and the compound represented by the general formula [^] are contained in the back coat layer. If the Mohs hardness of this non-magnetic powder is considerably smaller than 5, it will be worse than when it does not contain any non-magnetic powder, so the Mohs hardness of the non-magnetic powder must be about 5 or more. It won't happen. The compound represented by the above general formula [^] is preferably about 0.5 to 4.5% by weight of the binder constituting the back coat layer, and is a non-magnetic compound with a Mohs hardness of about 5 or more. The material has a non-magnetic material/binder of approximately 1710-1
The thickness of the back coat layer, which is preferably 0/1 (weight ratio) and is composed of a binder layer containing a compound represented by the above general formula [^] and a non-magnetic substance having a Mohs hardness of about 5 or more, is approximately It is preferable that the particle size is about 0.5 to 4 μm, and it is also preferable that the grains H of the non-magnetic material have a Mohs hardness of about 5 or more (about 0.0 to 1.2 μm).
【実施例１］
モース硬度６、平均粒径的０．５μｍのα−Ｆｅ２０，
２・重量部、前記一般式［＾］で表わされ？・化合物（
但し、Ｒ，４，ｔ Ｃ，、Ｉ＋、、、Ｒ７＋ｉ Ｃ７Ｉ
＋、、に＋ｆ ｉ 、 ｆｆＬｔ ］、ｍは１ 、ｎは
１）２重量部、比表面積３００ ｍ ２／ ｇで、ＤＢ
Ｐ吸油１１２５ｍＮ／１００ｇのカーボンブラック１０
０重量部、ニトロセルロース５０重量部、ポリウレタン
５０重量部、脂肪酸エステル２重量部、メチルエチルケ
トン、メチルイソブチルケトン及びトルエンのｖＦ量混
合溶剤４５０重量部をサンドミルで充分に混合分散した
後、これにポリイソシアネ−１・系の硬化剤３０重量部
を添加混合して塗料を作り、この非磁性の塗料を磁性層
の構成された磁気記録媒体の非磁性支持体の他面上に塗
布し、乾燥及び表面処理といった通常の処理工程を経て
、約０．８〜１．５μｍ厚のバックコート層を設け、本
発明になる磁気テープ等の磁気記録媒体を得る。
【実施例２】
実施例１において、α−Ｆｅ２０ｓの代わりに＾ｉ！２
ｏ、 （モース硬度９）を用いて同様に行ない、本発明
になる磁気記録媒体を得る。[Example 1] α-Fe20 with a Mohs hardness of 6 and an average particle size of 0.5 μm,
2. Parts by weight, expressed by the above general formula [^]? ·Compound(
However, R,4,t C,,I+,,,R7+i C7I
+, ,+f i , ffLt ], m is 1, n is 1) 2 parts by weight, specific surface area 300 m 2 / g, DB
Carbon black 10 with P oil absorption 1125mN/100g
0 parts by weight of nitrocellulose, 50 parts by weight of polyurethane, 2 parts by weight of fatty acid ester, 450 parts by weight of a vF mixed solvent of methyl ethyl ketone, methyl isobutyl ketone and toluene were sufficiently mixed and dispersed in a sand mill, and then polyisocyanate was added to the mixture. 1. Make a paint by adding and mixing 30 parts by weight of the curing agent, apply this non-magnetic paint to the other side of the non-magnetic support of the magnetic recording medium that has a magnetic layer, dry it and surface treat it. A back coat layer having a thickness of approximately 0.8 to 1.5 μm is provided through the usual processing steps, and a magnetic recording medium such as a magnetic tape according to the present invention is obtained. [Example 2] In Example 1, ^i! was used instead of α-Fe20s. 2
The magnetic recording medium according to the present invention is obtained by performing the same procedure using a hardness of 0.0 (Mohs hardness: 9).
【実施例３】
実施例１において、α−Ｆｅ２０＝の代わりにＴｉ０２
（モース硬度７）を用いて同様に行ない、本発明になる
磁気記録媒体を得る。[Example 3] In Example 1, Ti02 instead of α-Fe20=
(Mohs' hardness: 7), the magnetic recording medium of the present invention is obtained.
【比較例１】
実施例１において、一般式［Δコで表わされる１ヒ合物
を全く用いないで同様に行ない、磁気記録媒体を得る。Comparative Example 1 The same procedure as in Example 1 was carried out without using the compound represented by the general formula [Δ] to obtain a magnetic recording medium.
【比較例２］
実施例１において、α−Ｆｅ２０．の代わりにＣａＣ０
゜（モース硬度３）を用いて同様に行ない、磁気記録媒
体を得る。
【特性】
上記各間で得た磁気記録媒体について、そのＹ−Ｓ／Ｎ
、Ｃ−Ｓ／Ｎ、初期及び低温（−５℃）環境下で５００
回繰り返し走行後の動摩擦係数、この５００回繰り返し
走行後における走行路にあるガイドピンへの傷付具合及
びバックコート面への傷付具合を調べたので、これらを
表に示す。
・Ｙ −Ｓ／Ｎ及びＣ−３／Ｎは、日本ビクター（株）
製の１１Ｒ−２２００型ビデオテープレコーダを用いて
記録再生したものをシバツクノイズメータで測定。
・動摩擦係数は、ベースフィルム表面と走行路にあるガ
イドピンのクロムメッキ面との間に働く摩擦係数を示す
。
・傷付具合は、日本ビクター（株）製の０Ｒ−６４００
型ビデオテープレコーダを用いて繰り返し走行させた際
、走行路にあるガイドピン及びバックコート表面の傷付
を目視で観察して判断したものである。
この表かられかるように、本実施例の磁気記録媒体は、
動摩擦係数が小さく、走行性が良いものであり、又、繰
り返し走行が行なわれても動摩擦係数の増大は少なく、
略一定のものであるから走行性は安定したものとなり、
さらにはガイドピン及びバックコートに傷付きも認めら
れず、又、Ｙ−Ｓ／Ｎ及びＣ−Ｓ／Ｎも共に良いもので
あり、記録再生特性が優れたものとなる。[Comparative Example 2] In Example 1, α-Fe20. CaC0 instead of
A magnetic recording medium is obtained by carrying out the same procedure using .degree. (Mohs hardness: 3). [Characteristics] Regarding the magnetic recording media obtained between each of the above, its Y-S/N
, C-S/N, 500 at initial and low temperature (-5℃) environment
The coefficient of dynamic friction after repeated running 500 times, the degree of damage to the guide pin on the running path, and the degree of damage to the back coat surface after 500 times of repeated running were investigated, and these are shown in the table.・Y-S/N and C-3/N are from Victor Japan Co., Ltd.
Recorded and played back using a 11R-2200 type video tape recorder made by the manufacturer, and measured with a noise meter.・Dynamic friction coefficient indicates the friction coefficient that acts between the base film surface and the chrome-plated surface of the guide pin on the running path.・The degree of damage is determined by 0R-6400 manufactured by Victor Japan Co., Ltd.
This was determined by visually observing the damage to the guide pins and back coat surface on the travel path during repeated travel using a type video tape recorder. As can be seen from this table, the magnetic recording medium of this example is:
It has a small dynamic friction coefficient and good running performance, and the dynamic friction coefficient does not increase much even after repeated running.
Since it is approximately constant, the running performance is stable,
Furthermore, no scratches were observed on the guide pins or back coat, and the Y-S/N and C-S/N were both good, resulting in excellent recording and reproducing characteristics.
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、他面側にモース硬度約５以上の非磁性物質及び前記
の一般式［＾］で表わされる化合物を含む層を構成した
の乙走行に際しての動京擦係数が小さく、従って走行性
が良いものとなり、しかもこの走行が繰り返し行なわれ
ても動Ｉ２擦係数の増大は小さく、従って走行性は安定
しており、さらには走行路にあるガイドビン及びバック
コートの両方において傷付が起きにくいものとなり、又
、Ｙ−５／Ｎ及びＣ−Ｓ／Ｎ等の電磁変換特性は共に優
れている等記録再生特性が優れたものとなる等の特長を
有する。The magnetic recording medium according to the present invention comprises a magnetic layer on one side of a support, and a layer containing a non-magnetic material having a Mohs hardness of about 5 or more and a compound represented by the general formula [^] on the other side. The dynamic friction coefficient during running is small, and therefore the running performance is good.Furthermore, even if this running is repeated, the increase in the dynamic friction coefficient is small, so the running performance is stable, and furthermore, the running performance is stable. It is less likely to cause damage to both the guide bin and back coat on the road, and has excellent recording and reproducing characteristics such as excellent electromagnetic conversion characteristics such as Y-5/N and C-S/N. It has the following characteristics.
Claims (1)
上の非磁性物質及び下記の一般式で表わされる化合物を
含む層を構成したことを特徴とする磁気記録媒体。 ▲数式、化学式、表等があります▼ （但し、Ｒ＿１は炭素数７〜２１の飽和又は不飽和の１
価炭化水素基、Ｒ＿２は炭素数１〜４の飽和の１価炭化
水素基、ｋは１〜１２の整数、ｌは２〜６の整数、ｍは
１又は２、ｎは１又は２、ｍ＋ｎ≦３）[Claims] A magnetic device comprising a magnetic layer on one side of a support and a layer containing a non-magnetic material having a Mohs hardness of about 5 or more and a compound represented by the following general formula on the other side. recoding media. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (However, R_1 is a saturated or unsaturated 1 with 7 to 21 carbon atoms.
R_2 is a saturated monovalent hydrocarbon group having 1 to 4 carbon atoms, k is an integer of 1 to 12, l is an integer of 2 to 6, m is 1 or 2, n is 1 or 2, m+n ≦3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2301986A JPS62183030A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2301986A JPS62183030A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62183030A true JPS62183030A (en) | 1987-08-11 |
Family
ID=12098773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2301986A Pending JPS62183030A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62183030A (en) |
-
1986
- 1986-02-06 JP JP2301986A patent/JPS62183030A/en active Pending
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