JPS62183029A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62183029A JPS62183029A JP2301886A JP2301886A JPS62183029A JP S62183029 A JPS62183029 A JP S62183029A JP 2301886 A JP2301886 A JP 2301886A JP 2301886 A JP2301886 A JP 2301886A JP S62183029 A JPS62183029 A JP S62183029A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- magnetic
- magnetic recording
- integer
- compound represented
- 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 17
- 239000000126 substance Substances 0.000 claims abstract description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 9
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 6
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 125000001153 fluoro group Chemical group F* 0.000 abstract 1
- 125000004434 sulfur atom Chemical group 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000006247 magnetic powder Substances 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
- 238000000034 method Methods 0.000 description 3
- -1 zomaryl Chemical group 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material 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
- 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
- 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
- 238000001035 drying Methods 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
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000012046 mixed solvent 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
- 239000003973 paint Substances 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
- 239000000843 powder Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 125000005471 saturated fatty acid group Chemical group 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 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
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 125000005314 unsaturated fatty acid group Chemical group 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 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、耐牽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
、特に低温条件での繰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. That is, since the improvement in electromagnetic conversion characteristics is obtained by improving the surface smoothness of the support, this results in a decrease in drag resistance and runnability. 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 methods proposed so far are not sufficient, and have the drawbacks of frequent damage to guide pins, etc., and poor running stability, especially when repeated running is performed under low temperature conditions.
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ｅｌ−Ｆｅｒｏｓ、八Ｎ２
Ｏ３、ＴｉＯ，ＴｉＯ２、Ｃｒ２Ｊ等のモース硬度５以
上の非磁性物質と下記の一般式［Δ１で表わさｊする（
ヒき物をバラフコ−１へ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ろガイドビン等への
傷付もないことを見い出した。
（ＣＩｌ＝）ｎ−＋ｏ−ｎ
「
Ｆ（ＣＦｚ）ｋ ＣＨ，Ｃ１１ｚＳ（Ｃｌｌｚ）Ｎ ５
ｉ−（ＯＣＯｆｆ、）ｍ（ＯＲ２）ｎ ［Ａ
］
（但し、Ｒｔは炭素数７〜２１の１価の炭化水素基、Ｒ
２は炭素数１〜４の１価の炭化水素基、ｋは１〜１２の
整数、ｌは１〜６の整数、ｍは１又は２、ｎは０．１又
は２、ｍ＋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［＾］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ものとし、特
に低温下において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、
ＣＯＯが例えばカプリル、カプリン、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
、ガドレイル等の不飽和脂肪酸残基といったように、Ｒ
８はその炭素数が７〜２１の飽和又は不飽和の炭化水素
基であるので、低温から高温に至る広い条件下でも滑性
に浸れている。
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１価の炭化水
素基であることが重要である。
又、一般式［Ａ］におけるｋは１〜１２の整数、！は１
〜６の整数、ｍは１又は２．ｎは０．１又は２、ｎ＋ｎ
≦３の条件を満たすものである必要がある。
すなわち、ｋＪ、ｍ、ｎが大きくなりすぎると、つまり
一般式［Ａ］で表わされる化合物の分子型が大きくなり
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［＾コで表わ
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［Ａ］で表わされる化合↑勿が
バンクコート府中に含有させられるにしても、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［＾コ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タ層からなる
バックコート層の厚みは、約０．５〜４μｍ程度である
ことが望ましく、又、モース硬度約５以上の非磁性物質
の粒径は、約０．０１〜１．２μｍ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, el-Ferros, 8N2
A non-magnetic substance with a Mohs hardness of 5 or more such as O3, TiO, TiO2, Cr2J and the following general formula [expressed by Δ1 (
By incorporating a magnetic material into the Barafco-1 layer, this magnetic recording medium has good runnability even under a wide range of environmental conditions ranging from low to high temperatures, and is free from scratches on guide bottles, etc. in the running path. I found out that there was nothing wrong with it. (CIl=)n-+o-n "F(CFz)k CH,C11zS(Cllz)N 5
i-(OCOff,)m(OR2)n [A
] (However, Rt is a monovalent hydrocarbon group having 7 to 21 carbon atoms, R
2 is a monovalent hydrocarbon group having 1 to 4 carbon atoms, k is an integer of 1 to 12, l is an integer of 1 to 6, m is 1 or 2, n is 0.1 or 2, m+n≦3) The compound represented by the above general formula [^] contained in the back coat layer has excellent compatibility with a binder such as polyurethane, and is chemically stable without decomposing even under high temperature and high humidity conditions. The inventors have discovered that the magnetic recording medium has excellent lubricity and good running properties, especially at low temperatures. 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, and especially R,
R such that COO is, for example, a saturated fatty acid residue such as capryl, capric, lauryl, myristyl, palmityl, stearyl, behenyl, or an unsaturated fatty acid residue such as zomaryl, oleyl, linole, rillun, gadleyl, etc.
Since 8 is a saturated or unsaturated hydrocarbon group having 7 to 21 carbon atoms, it has smoothness even under a wide range of conditions from low temperatures 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 monovalent hydrocarbon group having 1 to 4 carbon atoms, since this makes it difficult to effectively exhibit the lubricating effect. Moreover, k in the general formula [A] is an integer of 1 to 12,! is 1
-6 integer, m is 1 or 2. n is 0.1 or 2, n+n
It is necessary that the condition ≦3 be satisfied. That is, when kJ, m, and n become too large, that is, when the molecular type of the compound represented by the general formula [A] becomes too large, the compatibility with the binder component becomes poor, and the dispersibility of this compound becomes poor. This is because it becomes difficult to effectively exhibit the lubricity effect. 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 if the non-magnetic powder and the compound represented by the general formula [A] are contained in Bank Coat Fuchu, if the Mohs hardness of this non-magnetic powder is considerably smaller than 5, the non-magnetic The Mohs hardness of the non-magnetic powder must be about 5 or higher, since the hardness is worse than that without the powder. 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
It is desirable that the ratio is 0/1 (weight ratio). Further, the thickness of the back coat layer consisting of the binder layer containing the compound represented by the above general formula The particle size of the nonmagnetic material having a Mohs hardness of about 5 or more is preferably about 0.01 to 1.2 μm.
【実施例１］
モース硬度６、平均粒径的０．５μｍのα−Ｆｅ２０ｚ
５重１部、前記一般式［Ａ］で表わされる化合物（但し
、Ｒ，はＣ５１１，、、Ｒ２はｃ、ｌＩｓ、には１、ｚ
は３、ｍは１．ｎは１）２ｆｆＸ１部、比表面ｍ ３０
０＋ｎ２／ｇで、ＤＢＰ吸油Ｕ１２５ｍ１７１００ｇの
カーボンブラック１００重量部、ニトロセルロース５０
１盟部、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、メチルイソブチルゲトン及
びトルエンの等量混合溶剤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ート系の
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０．８〜１．５μ輪厚のバックコ
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−ＦｅｚＯ−の代わりに＾１２０
゜（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-Fe20z with a Mohs hardness of 6 and an average particle size of 0.5 μm
1 part of 5-fold compound represented by the general formula [A] (where R is C511,..., R2 is c, lIs is 1, z
is 3, m is 1. n is 1) 2ff x 1 part, specific surface m 30
0+n2/g, DBP oil absorption U125m17100g carbon black 100 parts by weight, nitrocellulose 50
1 part by weight, 50 parts by weight of polyurethane, 2 parts by weight of fatty acid ester, 450 parts by weight of a mixed solvent of equal amounts of methyl ethyl ketone, methyl isobutyl getone, and toluene were thoroughly mixed and dispersed in a sand mill, and then 30 parts by weight of a polyisocyanate-based curing agent was added thereto. This non-magnetic paint is coated on the other side of the non-magnetic support of the magnetic recording medium having a magnetic layer, and after going through normal treatment steps such as drying and surface treatment, A back coat layer having a thickness of approximately 0.8 to 1.5 μm is provided to obtain a magnetic recording medium such as a magnetic tape according to the present invention. [Example 2] In Example 1, ^120 was used instead of α-FezO-
A magnetic recording medium according to the present invention is obtained by carrying out the same procedure using a hardness of 9° (Mohs hardness).
【実施例３】
実施例１において、α−Ｆｅ２０ｚの代わりにＴｉ０ｔ
（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, Ti0t was used instead of α-Fe20z.
(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［＾コで表わされる化合物を
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 A magnetic recording medium was obtained by carrying out the same procedure as in Example 1 without using any compound represented by the general formula [^].
【比較例２］
実施例１において、α−Ｆｅ２０ｚの代わりにＣａＣＪ
（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】
上記各側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
回踊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ビンへの傷付具合及
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ＨＲ−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
イドビ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ＢＲ−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ビン及びバックコ−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、縁
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、
さらにはガイドビ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, CaCJ was used instead of α-Fe20z.
(Mohs hardness: 3), a magnetic recording medium is obtained. [Characteristics] Regarding the magnetic recording media obtained on each side above, its Y-S/N
, C-S/N, 500 at initial and low temperature (-5℃) environment
The coefficient of kinetic friction after repeated running, the degree of damage to the guide bin on the travel path, and the degree of damage to the back coat surface after 500 repeated runs 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 manufactured HR-2200 video tape recorder 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 bin on the travel path.・The degree of damage is BR-6400 manufactured by Victor Japan Co., Ltd.
This was determined by visually observing the damage to the guide bin 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:
The coefficient of dynamic friction is small and the running performance is good, and the coefficient of dynamic friction does not increase much even when running backwards.
Since it is approximately constant, the running performance is stable,
Furthermore, no scratches were observed on the guide bin or back coat, and both Y-S/N and C-S/N were 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
ので、走行に際しての動ｒ′Ｊ擦係数が小さく、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
てら動摩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−Ｓ／Ｎ及びＣ−３／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. Therefore, when driving, the dynamic r'J friction coefficient is small and the running performance is good.Moreover, as 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. Both the guide bin and the back coat are less susceptible to scratches, and
It has features such as excellent electromagnetic conversion characteristics such as Y-S/N and C-3/N, and excellent recording and reproducing 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１価の炭化水素基、
Ｒ＿２は炭素数１〜４の１価の炭化水素基、ｋは１〜１
２の整数、ｌは１〜６の整数、ｍは１又は２、ｎは０、
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 monovalent hydrocarbon group having 7 to 21 carbon atoms,
R_2 is a monovalent hydrocarbon group having 1 to 4 carbon atoms, k is 1 to 1
2 integer, l is an integer from 1 to 6, m is 1 or 2, n is 0,
1 or 2, m+n≦3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2301886A JPS62183029A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2301886A JPS62183029A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62183029A true JPS62183029A (en) | 1987-08-11 |
Family
ID=12098747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2301886A Pending JPS62183029A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62183029A (en) |
-
1986
- 1986-02-06 JP JP2301886A patent/JPS62183029A/en active Pending
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