JPS6222184B2 - - Google Patents
Info
- Publication number
- JPS6222184B2 JPS6222184B2 JP57163100A JP16310082A JPS6222184B2 JP S6222184 B2 JPS6222184 B2 JP S6222184B2 JP 57163100 A JP57163100 A JP 57163100A JP 16310082 A JP16310082 A JP 16310082A JP S6222184 B2 JPS6222184 B2 JP S6222184B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- organosilicon compound
- magnetic layer
- carbon atoms
- 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.)
- Expired
Links
- 150000003961 organosilicon compounds Chemical class 0.000 claims description 21
- 125000004432 carbon atom Chemical group C* 0.000 claims description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 150000002430 hydrocarbons Chemical group 0.000 claims 2
- 238000011109 contamination Methods 0.000 description 9
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 235000014113 dietary fatty acids Nutrition 0.000 description 5
- 229930195729 fatty acid Natural products 0.000 description 5
- 239000000194 fatty acid Substances 0.000 description 5
- 150000004665 fatty acids Chemical class 0.000 description 5
- 125000001183 hydrocarbyl group Chemical group 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 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 1
- JLPULHDHAOZNQI-ZTIMHPMXSA-N 1-hexadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCCCCCC\C=C/C\C=C/CCCCC JLPULHDHAOZNQI-ZTIMHPMXSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- -1 etc. Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 229940083466 soybean lecithin Drugs 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
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
- G11B5/71—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 lubricant
Description
本発明は磁気記録媒体に係り、特定の有機珪素
化合物を磁性層中に含ませておくことにより、磁
性層の潤滑性及び耐摩耗性が改善され、走行安定
性に優れたものとなる磁気記録媒体を提供するこ
とを目的とする。
近年、家庭用ビデオテープレコーダの小型化が
進み、屋外での使用頻度が増大しつつある。従つ
て、これらの磁気記録再生装置に用いられる磁気
記録媒体に関して、種々の環境条件、例えば広い
温度範囲にわたつても使用に耐え得る品質が要求
されている。例えば、温度によつて影響を受けや
すいものとして走行性の問題があり、特に低温条
件下においては磁性層の動摩擦係数の増加が著し
く、走行性が一段と悪くなつている。
従来、磁気記録媒体の摩擦を軽減する目的で、
磁性層中に高級脂肪酸、ジメチルシリコーン又は
一般式（）、（）で表わされる有機珪素化合物
を添加しておくことによつて、磁性層の潤滑性を
向上させることが提案されている。
しかし、磁性層中に加えられるものが高級脂肪
酸の場合には、高級脂肪酸は磁性層中の樹脂成分
との相溶性が良く、滑性効果をある程度示すもの
の、高級脂肪酸が磁性粉に吸着しやすく、従つて
磁性層表面に滲出しにくく、磁性層表面の動摩擦
係数を低下させる効果は小さく、かつ温度の影響
も受けやすいといつた欠点がある。
又、ジメチルシリコーンを用いた場合には、磁
性層の表面滑性に大きな効果を示すものの、磁性
層中の樹脂成分との相溶性が悪く、磁性層表面か
ら容易に滲出し、従つてこのような磁気記録媒体
を繰り返して使用していると、徐々に動摩擦係数
が上昇し、走行性及び耐摩耗性が劣下してしま
う。又、さらには磁気ヘツドの汚染を引き起こし
やすく、記録再生に悪影響を及ぼすといつた欠点
もある。
そして、このような高級脂肪酸、ジメチルシリ
コーンに代るものとして提案されてきたのが前記
一般式（）（特公昭52−34924号）又は（）
（特開昭57−92424号）の有機珪素化合物であり、
これらの有機珪素化合物は滑性効果に優れ、温度
変化に対する摩擦係数も安定しているものではあ
るが、磁性層中の樹脂成分との相溶性が充分であ
るとは言えず、それ程満足できるものではない。
本発明者は、磁気記録媒体の磁性層中に添加し
ていても磁気特性等を低下させることなく、しか
も磁性層中の樹脂成分との相溶性に優れ、しかも
温度変化によつて影響を受けにくいものとなる潤
滑剤の研究を続けた結果、次の一般式（）で示
される有機珪素化合物が上記欠点のない極めて満
足し得るものとなることを見い出した。
（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１価
炭化水素基、ｋは１〜12の整数、ｌは２〜６の整
数、ｎは１又は２、ｍは１又は２、ｍ＋ｎ≦３の
条件を満たすもの）
この一般式（）で表わされる有機珪素化合物
は、前記一般式（）及び（）で表わされる有
機珪素化合物に比べて、耐久性に優れ、しかも磁
気ヘツドの汚染も引き起こしにくいものである。
又、この有機珪素化合物はフツ化炭化水素基を
有しているので、滑性効果に優れているのみでな
く、熱安定性の面でも良好であり、耐久性及び磁
気ヘツドの汚染も引き起こしにくいものである。
そして、このような有機珪素化合物は、磁性層
中の磁性粉に対して約0.1重量％以上含まれてい
れば効果があり、そして含有量の増加に伴ない効
果もより一層顕著なものとなるが、約15重量％を
越えてあまりに多く含まれていると、磁気ヘツド
の汚染や磁性塗膜の過度の可塑化の原因ともな
り、従つて約0.1〜15重量％の範囲内のものが望
ましい。
尚、一般式（）中、R1の炭素数が７未満の
場合には摩擦係数の低下及び耐久性といつた効果
は小さく、又、R1の炭素数が21を越えると、磁
性層中の樹脂成分との相溶性が悪くなり、磁気ヘ
ツドの汚染が引き起こされやすいものとなる。
又、R2の炭素数が４を越えると、磁性層中の磁
性粉、バインダー樹脂成分との親和性が低下し、
磁気ヘツドの汚染が引き起こされやすいものとな
り、又、磁性層の耐久性も低下しがちなものとな
る。又、ｋが12を越えたものとなると、バインダ
ー樹脂成分等との相溶性が悪くなり、磁気ヘツド
の汚染が引き起こされやすいものとなる。
尚、本発明において用いられる一般式（）以
外の磁性層中に含まれる成分については特別な制
限があるものではなく、磁性粉末としては、例え
ばγ−Fe2O3、Fe3O4、Co含有γ−Fe2O3、メタ
ル等があり、又、バインダーとしては、例えば塩
化ビニル−酢酸ビニル共重合体、ポリビニルブチ
ラール、ポリウレタン樹脂、ニトロセルロース、
エポキシ樹脂等があり、又、磁性塗料を作る為の
有機溶剤としては、例えばトルエン、メチルエチ
ルケトン、メチルイソブチルケトン、シクロヘキ
サノン、テトラヒドロフラン等がある。
以下、本発明に係る磁気記録媒体の具体的実施
例の幾つかを述べる。
実施例 １
Co含有γ−Fe2O3約100重量部、塩化ビニル−
酢酸ビニル−ビニルアルコール共重合体とポリウ
レタンエラストマーの混合物約19重量部、カーボ
ンブラツク約５重量部、大豆レシチン約１重量
部、メチルエチルケトン、メチルイソブチルケト
ン及びトルエンの混合溶剤約270重量部、及び
The present invention relates to a magnetic recording medium, in which the lubricity and abrasion resistance of the magnetic layer are improved by including a specific organosilicon compound in the magnetic layer, and the magnetic recording medium has excellent running stability. The purpose is to provide a medium. In recent years, home video tape recorders have become smaller and more frequently used outdoors. Therefore, magnetic recording media used in these magnetic recording and reproducing devices are required to have a quality that can withstand use under various environmental conditions, for example, over a wide temperature range. For example, there is a problem in runnability that is easily affected by temperature, and especially under low temperature conditions, the dynamic friction coefficient of the magnetic layer increases significantly, making the runnability even worse. Conventionally, in order to reduce the friction of magnetic recording media,
It has been proposed to improve the lubricity of the magnetic layer by adding higher fatty acids, dimethyl silicone, or organic silicon compounds represented by the general formulas () and () to the magnetic layer. However, when the substance added to the magnetic layer is a higher fatty acid, the higher fatty acid has good compatibility with the resin component in the magnetic layer and exhibits a lubricating effect to some extent, but the higher fatty acid easily adsorbs to the magnetic powder. Therefore, it has the disadvantage that it is difficult to seep out onto the surface of the magnetic layer, has little effect on lowering the coefficient of dynamic friction on the surface of the magnetic layer, and is easily influenced by temperature. In addition, when dimethyl silicone is used, although it has a great effect on the surface smoothness of the magnetic layer, it has poor compatibility with the resin component in the magnetic layer and easily oozes out from the surface of the magnetic layer. When a magnetic recording medium is repeatedly used, the coefficient of dynamic friction gradually increases, and the running performance and wear resistance deteriorate. Further, it has the disadvantage that it tends to cause contamination of the magnetic head, which adversely affects recording and reproduction. The above-mentioned general formula () (Japanese Patent Publication No. 52-34924) or () has been proposed as a substitute for such higher fatty acids and dimethyl silicone.
(Japanese Unexamined Patent Publication No. 57-92424) is an organosilicon compound,
Although these organosilicon compounds have excellent lubricity and a stable coefficient of friction against temperature changes, they cannot be said to have sufficient compatibility with the resin component in the magnetic layer, so they are not very satisfactory. isn't it. The present inventor has discovered that even when added to the magnetic layer of a magnetic recording medium, the magnetic properties etc. are not deteriorated, and furthermore, it has excellent compatibility with the resin component in the magnetic layer, and is not affected by temperature changes. As a result of continuing research into lubricants that are more difficult to use, it has been found that an organosilicon compound represented by the following general formula () is extremely satisfactory and does not have the above-mentioned drawbacks. (However, R 1 is a saturated or unsaturated 1 having 7 to 21 carbon atoms.
a valent hydrocarbon group, R2 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, n is 1 or 2, m is 1 or 2, The organosilicon compound represented by the general formula () has excellent durability compared to the organosilicon compounds represented by the general formulas () and () above, and is more resistant to contamination of the magnetic head. It is also difficult to cause. In addition, since this organosilicon compound has a fluorinated hydrocarbon group, it not only has an excellent lubricity effect but also has good thermal stability, and is durable and does not cause contamination of the magnetic head. It is something. Such an organosilicon compound is effective if it is contained in an amount of about 0.1% by weight or more based on the magnetic powder in the magnetic layer, and the effect becomes even more pronounced as the content increases. However, if the content exceeds about 15% by weight, it can cause contamination of the magnetic head and excessive plasticization of the magnetic coating, so it is desirable to have a content in the range of about 0.1 to 15% by weight. . In the general formula (), if the number of carbon atoms in R 1 is less than 7, the effect of reducing the friction coefficient and durability will be small, and if the number of carbon atoms in R 1 exceeds 21, the effect of reducing the friction coefficient and durability will be small. The compatibility with the resin component becomes poor, and the magnetic head is likely to be contaminated.
Furthermore, when the number of carbon atoms in R2 exceeds 4, the affinity with the magnetic powder and binder resin component in the magnetic layer decreases,
This tends to cause contamination of the magnetic head and also tends to reduce the durability of the magnetic layer. Furthermore, if k exceeds 12, the compatibility with the binder resin component etc. will be poor and the magnetic head will be more likely to be contaminated. Note that there are no special restrictions on the components contained in the magnetic layer other than the general formula () used in the present invention, and examples of the magnetic powder include γ-Fe 2 O 3 , Fe 3 O 4 , Co Contains γ-Fe 2 O 3 , metals, etc., and binders include, for example, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polyurethane resin, nitrocellulose,
Examples of organic solvents for making magnetic paints include toluene, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and tetrahydrofuran. Some specific examples of the magnetic recording medium according to the present invention will be described below. Example 1 Approximately 100 parts by weight of Co-containing γ-Fe 2 O 3 , vinyl chloride
About 19 parts by weight of a mixture of vinyl acetate-vinyl alcohol copolymer and polyurethane elastomer, about 5 parts by weight of carbon black, about 1 part by weight of soybean lecithin, about 270 parts by weight of a mixed solvent of methyl ethyl ketone, methyl isobutyl ketone and toluene, and
【式】で表わされる有機
珪素化合物約15重量部以下、例えば２重量部の混
合物を約20時間混合分散した後、ポリイソシアネ
ート（例えば武田薬品工業(株)のＤ−103H）を約
８重量部加え、この磁性塗料をポリエステルフイ
ルム上に塗布し、カレンダー処理した後、約55℃
で約24時間加熱処理を施し、所定巾にスリツトし
て、例えばビデオテープレコーダ用の磁気テープ
を得る。
実施例 ２
実施例１における有機珪素化合物の代りに、
After mixing and dispersing a mixture of about 15 parts by weight or less, for example 2 parts by weight, of an organosilicon compound represented by the formula for about 20 hours, about 8 parts by weight of a polyisocyanate (for example, D-103H from Takeda Pharmaceutical Co., Ltd.) is mixed and dispersed. In addition, this magnetic paint is applied onto a polyester film, and after calendering, it is heated to approximately 55°C.
The tape is heat-treated for about 24 hours and slit into a predetermined width to obtain, for example, a magnetic tape for a video tape recorder. Example 2 Instead of the organosilicon compound in Example 1,
【式】を用いて、実施
例１と同様にして磁気テープを得る。
実施例 ３
実施例１における有機珪素化合物の代りに、
A magnetic tape is obtained in the same manner as in Example 1 using the formula. Example 3 Instead of the organosilicon compound in Example 1,
【式】を用いて、実施
例１と同様にして磁気テープを得る。
実施例 ４
実施例１における有機珪素化合物の代りに、
A magnetic tape is obtained in the same manner as in Example 1 using the formula. Example 4 Instead of the organosilicon compound in Example 1,
【式】を用いて、実
施例１と同様にして磁気テープを得る。
実施例 ５
実施例１における有機珪素化合物の代りに、
A magnetic tape is obtained in the same manner as in Example 1 using the formula. Example 5 Instead of the organosilicon compound in Example 1,
【式】を用いて、実
施例１と同様にして磁気テープを得る。
実施例 ６
実施例１における有機珪素化合物の代りに、
を用いて、実施例１と同様にして磁気テープを得
る。
実施例 ７
実施例１における有機珪素化合物の代りに、
を用いて、実施例１と同様にして磁気テープを得
る。
実施例 ８
実施例１における有機珪素化合物の代りに、
A magnetic tape is obtained in the same manner as in Example 1 using the formula. Example 6 Instead of the organosilicon compound in Example 1, A magnetic tape is obtained in the same manner as in Example 1. Example 7 Instead of the organosilicon compound in Example 1, A magnetic tape is obtained in the same manner as in Example 1. Example 8 Instead of the organosilicon compound in Example 1,
【式】を用いて、実施
例１と同様にして磁気テープを得る。
比較例 １
実施例１における有機珪素化合物の代りにブチ
ルステアレートを用いて、実施例１と同様にして
磁気テープを得る。
比較例 ２
実施例１における有機珪素化合物の代りに、
A magnetic tape is obtained in the same manner as in Example 1 using the formula. Comparative Example 1 A magnetic tape is obtained in the same manner as in Example 1 except that butyl stearate is used in place of the organosilicon compound in Example 1. Comparative Example 2 Instead of the organosilicon compound in Example 1,
【式】を用いて、実
施例１と同様にして磁気テープを得る。
比較例 ３
実施例１における有機珪素化合物の代りに、
A magnetic tape is obtained in the same manner as in Example 1 using the formula. Comparative Example 3 Instead of the organosilicon compound in Example 1,
【式】を用いて、実
施例１と同様にして磁気テープを得る。
このようにして得られた磁気テープについて、
温度60℃、相対湿度90％の環境条件下で磁気記録
再生装置に装着し、磁気テープを400回繰り返し
走行テストを行なつた結果、表に示すような特性
のものであつた。A magnetic tape is obtained in the same manner as in Example 1 using the formula. Regarding the magnetic tape obtained in this way,
The magnetic tape was installed in a magnetic recording and reproducing device under environmental conditions of 60°C and 90% relative humidity, and a magnetic tape was repeatedly run 400 times, and the results showed the characteristics shown in the table.
【表】【table】
【表】
この結果からわかるように、すなわち比較例１
のものでは、ヘツド汚染が比較的少なく、しかも
Ｓ／Ｎの劣下も比較的小さいものではあるが、動
摩擦係数が大きく、走行安定性に欠け、又、比較
例２及び３のものでは、動摩擦係数が比較的小さ
く、走行安定性は比較的得られるものの、ヘツド
汚染が酷く、又、Ｓ／Ｎの劣下も大きい。これに
対して、実施例１〜８のものでは、ヘツド汚染は
少なく、又、繰り返し走行テストを行なつても
Ｓ／Ｎの劣下は小さく、さらには動摩擦係数も低
く安定したものであるといつたように、走行安定
性及び磁気特性等に優れており、特に、60℃、90
％RHといつた厳しい環境条件下で長時間用いて
いても、走行安定性に優れ、ヘツドの汚染といつ
た問題も引き起こされにくいものである。
上述の如く、本発明に係る磁気記録媒体は、磁
性層中に、次の一般式
（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１価
炭化水素基、ｋは１〜12の整数、ｌは２〜６の整
数、ｎは１又は２、ｍは１又は２、ｎ＋ｍ≦３）
で表わされる有機珪素化合物を含むものであるの
で、厳しい環境条件下においても走行性は安定し
ており、すなわち広い温度範囲にわたつて動摩擦
係数は低く安定したものであり、又繰り返し走行
を行なつてもＳ／Ｎの低下は小さく、かつ磁気ヘ
ツドが汚染されにくいものであり、さらには磁性
層の耐久性にも富んだものである等の特長を有す
る。[Table] As can be seen from this result, that is, Comparative Example 1
In the case of Comparative Examples 2 and 3, the head contamination is relatively small and the deterioration of S/N is also relatively small, but the dynamic friction coefficient is large and running stability is poor. Although the coefficient is relatively small and running stability is relatively achieved, head contamination is severe and the S/N ratio is greatly degraded. On the other hand, in Examples 1 to 8, there was little head contamination, the S/N ratio was small even after repeated running tests, and the dynamic friction coefficient was low and stable. As mentioned above, it has excellent running stability and magnetic properties, especially at 60℃ and 90℃.
Even when used for long periods of time under harsh environmental conditions such as %RH, it has excellent running stability and is unlikely to cause problems such as head contamination. As mentioned above, the magnetic recording medium according to the present invention has the following general formula in the magnetic layer. (However, R 1 is a saturated or unsaturated 1 having 7 to 21 carbon atoms.
a valent hydrocarbon group, R2 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, n is 1 or 2, m is 1 or 2, Since it contains an organosilicon compound represented by n+m≦3), its running properties are stable even under harsh environmental conditions, that is, its coefficient of dynamic friction is low and stable over a wide temperature range, and it can withstand repeated running. Even when this is done, the decrease in S/N is small, the magnetic head is not easily contaminated, and the magnetic layer is also highly durable.
Claims (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、ｎは１又は２、ｍは１又は２、ｎ＋ｍ≦３） で表わされる有機珪素化合物を含むことを特徴と
する磁気記録媒体。[Claims] 1. In the magnetic layer, the following general formula (However, R 1 is a saturated or unsaturated 1 having 7 to 21 carbon atoms.
a valent hydrocarbon group, R2 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, n is 1 or 2, m is 1 or 2, A magnetic recording medium comprising an organosilicon compound represented by n+m≦3).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57163100A JPS5954034A (en) | 1982-09-21 | 1982-09-21 | Magnetic recording medium |
| US06/534,114 US4469751A (en) | 1982-09-21 | 1983-09-20 | Magnetic recording media comprising specific types of silicone lubricants in the magnetic layer thereof |
| DE3333930A DE3333930C2 (en) | 1982-09-21 | 1983-09-20 | Magnetic recording material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57163100A JPS5954034A (en) | 1982-09-21 | 1982-09-21 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5954034A JPS5954034A (en) | 1984-03-28 |
| JPS6222184B2 true JPS6222184B2 (en) | 1987-05-16 |
Family
ID=15767170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57163100A Granted JPS5954034A (en) | 1982-09-21 | 1982-09-21 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5954034A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6425973U (en) * | 1987-08-07 | 1989-02-14 | ||
| JPH0315432Y2 (en) * | 1987-05-14 | 1991-04-04 | ||
| JPH04124594U (en) * | 1991-05-01 | 1992-11-13 | 七藏 鬼丸 | bicycle saddle device |
| JPH07277244A (en) * | 1994-04-12 | 1995-10-24 | Matsushita Electric Ind Co Ltd | Device for limiting raised height of bicycle seat post |
-
1982
- 1982-09-21 JP JP57163100A patent/JPS5954034A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0315432Y2 (en) * | 1987-05-14 | 1991-04-04 | ||
| JPS6425973U (en) * | 1987-08-07 | 1989-02-14 | ||
| JPH04124594U (en) * | 1991-05-01 | 1992-11-13 | 七藏 鬼丸 | bicycle saddle device |
| JPH07277244A (en) * | 1994-04-12 | 1995-10-24 | Matsushita Electric Ind Co Ltd | Device for limiting raised height of bicycle seat post |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5954034A (en) | 1984-03-28 |
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