JPS62183031A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62183031A JPS62183031A JP2302086A JP2302086A JPS62183031A JP S62183031 A JPS62183031 A JP S62183031A JP 2302086 A JP2302086 A JP 2302086A JP 2302086 A JP2302086 A JP 2302086A JP S62183031 A JPS62183031 A JP S62183031A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- magnetic recording
- compound represented
- back coat
- 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 15
- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 3
- 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
- 239000011230 binding agent Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007423 decrease Effects 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
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 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
- -1 zomaryl Chemical group 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 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
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 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
- 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
- 239000003921 oil Substances 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
- 150000003961 organosilicon compounds Chemical class 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
- 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
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 125000005314 unsaturated fatty acid group Chemical group 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
、特に低温条件での繰り返し走行が行なわれると、ガイ
ドビ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 methods proposed so far are not sufficient, and have the drawbacks that the guide bin etc. are frequently damaged, especially when repeatedly running under low temperature conditions, and the running stability is poor.
本発明者は、いわゆるバラフコ−１・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ａ−Ｆｅ２０ｓ、八Ｎ２
Ｏ３、Ｔｉ０１Ｔｉ０２．Ｃｒ２Ｏを等のモース硬度５
以上の非磁性物質と下記の一最式［へコで表わされる化
合物がバックコート層中に含まれていると、この磁気記
録媒体は、広い環境条件下、特に低温下においても走行
安定性に優れていることを見い出した。
（Ｃ１１，）ｋ［Ｆ（ＣＦ２）ｊｃ１１□ｃＨ２コＮ（
Ｒ，Ｃｏｏ）ｍ（Ｒ２０）ｎｓｉｏ工止ｊ（コニ１［Ａ
］
（但し、Ｒ１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ｌｌｉ炭化水
素基、ｊは１〜１２の整数、ｋは０以上で２未満の数、
ｍは２．５未満の正数、ｒは１以下の正数、ｎは２以下
の正数、に＋ １＋ ｍ＋ ｎは２〜３の数、１分子中
のケイ素原子数は２〜３００）
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［＾］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浸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ｎ
、 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
、Ｒ１はその炭素数が７〜２１の飽和又は不飽和の１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、一般式［＾コにおけるＲ２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［＾コにおけるｋが２以上の値になると、［
Ｆ（ＣＦｚＮＣＩＩ□ＣＩ＋２コ、Ｉｔ 、 Ｃｏｏの
濃度が相対的に低下する為、滑性が不充分となり、又、
！が１を越えると、バインダに対する相溶性が低下する
ようになり、又、…が２．５以上になると、［Ｆ（ＣＦ
２）ＪＣＨ２ＣＨ２コ、Ｒ，Ｏの濃度が相対的に低下す
る為、耐久性が低下するようになり、又、ｎが２を越え
ると、 ［Ｆ（ＣＦ２）ＪＣＩＩ２ＣＩ！２］、Ｒ、Ｃ
ｏｏの濃度が相対的に低下する為、滑性が不充分なもの
となり、所望の効果が得られなくなる。
尚、−ｉ式［＾］の平均組成式で示される有機ケイ素化
合物は、分子構造的には直鎖状、分枝鎖状、又は環状の
いずれのものであってもよい。
さらに、バックコート層中に、上記一般式［Ａ］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
−ＮＪ良好なものである。
尚、非磁性粉末と一服式［＾］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ても、この非磁性
粉末のモース硬度が５よりが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［＾コ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０５〜４．５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Ｔ１７／バインダが約１７１０〜
１０／１（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
バン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０．０１〜１．２μ（ｎ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 BARAFCO-1 layer, the present inventor discovered that, for example, a-Fe20s, 8N2
O3, Ti01Ti02. Mohs hardness of Cr2O etc. is 5
If the above non-magnetic substance and the compound represented by the following formula [Heco] are included in the back coat layer, this magnetic recording medium will have good running stability even under a wide range of environmental conditions, especially at low temperatures. I found it to be excellent. (C11,)k[F(CF2)jc11□cH2koN(
R, Coo) m (R20) nsio construction j (Koni 1 [A
] (However, R1 is a saturated or unsaturated monovalent hydrocarbon group having 7 to 21 carbon atoms, R2 is a saturated lli hydrocarbon group having 1 to 4 carbon atoms, j is an integer from 1 to 12, and k is 0 or more. and a number less than 2,
m is a positive number less than 2.5, r is a positive number less than 1, n is a positive number less than 2, 1+ m+ n is a number from 2 to 3, the number of silicon atoms in one molecule is from 2 to 300) In other words, the compound represented by the 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. They have discovered that it has excellent lubricity and provides good running properties of magnetic recording media, especially at low temperatures. In other words, the compound represented by the general formula [^] has a fatty acid group in its molecule that has an affinity for the binder component, so it has good compatibility with the binder component, especially n
, coo is 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, and R1 is the carbon number thereof. is a 7 to 21 saturated or unsaturated monovalent hydrocarbon group, so it has excellent lubricity 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 R2 in the general formula [^] is 5 or more, the compatibility between the compound represented by the general formula [^] and the binder component decreases, and the dispersibility of this compound deteriorates. It is important that R2 be a monovalent hydrocarbon group having 1 to 4 carbon atoms, since this makes it difficult to effectively exhibit the lubricating effect. Also, when k in the general formula [^ko] becomes a value of 2 or more, [
Since the concentration of F (CFzNCII□CI+2, It, and Coo is relatively reduced, the lubricity becomes insufficient, and
! When exceeds 1, the compatibility with the binder decreases, and when... exceeds 2.5, [F(CF
2) Since the concentration of JCH2CH2, R, and O decreases relatively, durability decreases, and when n exceeds 2, [F(CF2)JCII2CI! 2], R, C
Since the concentration of oo is relatively reduced, the lubricity becomes insufficient and the desired effect cannot be obtained. The organosilicon compound represented by the average composition formula of formula -i [^] may have a linear, branched, or cyclic molecular structure. Furthermore, if the back coat layer contains not only the compound represented by the above general formula [A] but also a non-magnetic powder with a Mohs hardness of 5 or more, the synergistic effect of these two will result in good -NJ. be. Incidentally, even if a non-magnetic powder and a compound expressed by the formula [^] are contained in the back coat layer, if the Mohs hardness of the non-magnetic powder is 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. It is desirable that the compound represented by the above general formula [^] be about 05 to 4.5% by weight of the binder constituting the back coat layer, and the non-magnetic substance with a Mohs hardness of about 5 or more is , non-magnetic material T17/binder is approximately 1710~
It is desirable that the ratio is 10/1 (weight ratio). Further, the thickness of the bank coat layer consisting 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 preferably about 0.5 to 4 μm, and The particle size of the non-magnetic material having a Mohs hardness of about 5 or more is preferably about 0.01 to 1.2 μ (n).
【実施例１】
モース硬度６、平均粒径約０．５μｍのａ −ＦｅｚＯ
ｓ５重１部、前記一般式［Ａ］で表わされる化合物（但
し、Ｒ１はＣ，ｔｌｌｚｓ、Ｒ２はＣ１１３，Ｊはｌ、
ｋは１．３Ｊは０．２、ｍは０．５、口は０．２）２重
量部、比表面１１３００ｍ２／ｇで、ＤＢＰ吸油１１２
５ｍ１／１００ｇのカーボンブラック１００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１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等量混合溶剤４５０重
量部をサンドミルで充分に混き分散した後、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．
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。[Example 1] a-FezO with a Mohs hardness of 6 and an average particle size of about 0.5 μm
1 part of s5 weight, a compound represented by the general formula [A] (wherein, R1 is C, tllzs, R2 is C113, J is l,
k is 1.3J is 0.2, m is 0.5, mouth is 0.2) 2 parts by weight, specific surface 11300m2/g, DBP oil absorption 112
5m1/100g carbon black 100 parts by weight, nitrocellulose 50 parts by weight, polyurethane 50 parts by weight,
After thoroughly mixing and dispersing 450 parts by weight of a mixed solvent of 1 part of fatty acid ester double, methyl ethyl ketone, methyl isobutyl ketone, and toluene in equal amounts in a sand mill, 30 parts by weight of a polyisocyanate-based curing agent was added and mixed to form a paint. 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 through normal processing steps such as drying and surface treatment, the coating is coated with a coating material of about 0.8 to 1.
A back coat layer with a thickness of 5 μm is provided to obtain a magnetic recording medium such as a magnetic tape according to the present invention.
【実施例２】
実施例１において、α−Ｆｅ、Ｏ，の代わりに＾１ｔＯ
＊＜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 2] In Example 1, ^1tO was used instead of α-Fe, O,
The magnetic recording medium of the present invention is obtained in the same manner using *<Mohs hardness 9).
【実施例３】
実施例１１こおいて、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 11, Ti02 was used 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［＾］で表わされるＣ８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 C8 compound represented by the general formula [^].
【比較例２】
実施例１において、α−Ｆｅ２０−の代わりにＣａＣ０
３（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。[Comparative Example 2] In Example 1, CaC0 was used instead of α-Fe20-.
3 (Mohs hardness 3) to obtain a magnetic recording medium.
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°Ｃ）環境下で５０
０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−Ｓ／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Ｋｍ係数の増大は少なく、
略一定のものであるが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。Regarding the magnetic recording media obtained on each side above, its Y-S/N
, C-S/N, 50 at initial and low temperature (-5°C) environment
The coefficient of dynamic friction after 0 repeated runs, the degree of damage to the guide bin on the running path and the degree of damage to the back coat surface after 500 times of repeated travel were investigated, and these are shown in the table.・Y-S/N and C-S/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 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:
It has a small dynamic friction coefficient and good running performance, and the dynamic Km coefficient does not increase much even after repeated running.
Although 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［Δ］で表わされる化合物を含む層を構成した
ので、走行に際しての動摩擦係数が小さく、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＊１ｍ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−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 [Δ] on the other side. Therefore, when driving, the coefficient of dynamic friction is small, and therefore the driving performance is good.Moreover, even if this driving is repeated, the increase in the dynamic*1m coefficient is small, so the driving performance is stable, and furthermore, the driving performance is stable. Both the guide bin and back coat are less susceptible to scratches,
Further, it has features such as excellent electromagnetic conversion characteristics such as Y-S/N and C-S/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。 （ＣＨ＿３）ｋ［Ｆ（ＣＦ＿２）ｊＣＨ＿２ＣＨ＿２］
ｌ（Ｒ＿１ＣＯＯ）ｍ（Ｒ＿２Ｏ）ｎＳｉＯ（４−ｋ−
ｌ−ｍ−ｎ）／２（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、ｊは１〜１２の整数ｋは０以
上で２未満の数、ｍは２．５未満の正数、ｌは１以下の
正数、ｎは２以下の正数、ｋ＋ｌ＋ｍ＋ｎは２〜３の数
、１分子中のケイ素原子数は２〜３００）[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. (CH_3)k[F(CF_2)jCH_2CH_2]
l(R_1COO)m(R_2O)nSiO(4-k-
l-m-n)/2 (however, R_1 is a saturated or unsaturated monovalent hydrocarbon group having 7 to 21 carbon atoms, R_2 is a saturated or unsaturated monovalent hydrocarbon group having 1 to 4 carbon atoms)
a saturated monovalent hydrocarbon group, j is an integer from 1 to 12, k is a number greater than or equal to 0 and less than 2, m is a positive number less than 2.5, l is a positive number less than or equal to 1, and n is a positive number less than or equal to 2. number, k+l+m+n is a number from 2 to 3, and the number of silicon atoms in one molecule is from 2 to 300)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2302086A JPS62183031A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2302086A JPS62183031A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62183031A true JPS62183031A (en) | 1987-08-11 |
Family
ID=12098800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2302086A Pending JPS62183031A (en) | 1986-02-06 | 1986-02-06 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62183031A (en) |
-
1986
- 1986-02-06 JP JP2302086A patent/JPS62183031A/en active Pending
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