JPH0449171B2 - - Google Patents
Info
- Publication number
- JPH0449171B2 JPH0449171B2 JP57045140A JP4514082A JPH0449171B2 JP H0449171 B2 JPH0449171 B2 JP H0449171B2 JP 57045140 A JP57045140 A JP 57045140A JP 4514082 A JP4514082 A JP 4514082A JP H0449171 B2 JPH0449171 B2 JP H0449171B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- fatty acid
- ester
- alcohol
- unsaturated
- 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 - Lifetime
Links
- 235000021122 unsaturated fatty acids Nutrition 0.000 claims description 15
- 150000002148 esters Chemical class 0.000 claims description 14
- 150000004670 unsaturated fatty acids Chemical class 0.000 claims description 14
- ACIAHEMYLLBZOI-ZZXKWVIFSA-N Unsaturated alcohol Chemical compound CC\C(CO)=C/C ACIAHEMYLLBZOI-ZZXKWVIFSA-N 0.000 claims description 13
- BARWIPMJPCRCTP-UHFFFAOYSA-N oleic acid oleyl ester Natural products CCCCCCCCC=CCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC BARWIPMJPCRCTP-UHFFFAOYSA-N 0.000 claims description 11
- BARWIPMJPCRCTP-CLFAGFIQSA-N oleyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC BARWIPMJPCRCTP-CLFAGFIQSA-N 0.000 claims description 11
- 239000006247 magnetic powder Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- -1 saturated fatty acid ester Chemical class 0.000 description 5
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 4
- ZQPPMHVWECSIRJ-MDZDMXLPSA-N elaidic acid Chemical compound CCCCCCCC\C=C\CCCCCCCC(O)=O ZQPPMHVWECSIRJ-MDZDMXLPSA-N 0.000 description 4
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- WIBFFTLQMKKBLZ-SEYXRHQNSA-N n-butyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCCCC WIBFFTLQMKKBLZ-SEYXRHQNSA-N 0.000 description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 3
- 239000005642 Oleic acid Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- ALSTYHKOOCGGFT-KTKRTIGZSA-N (9Z)-octadecen-1-ol Chemical compound CCCCCCCC\C=C/CCCCCCCCO ALSTYHKOOCGGFT-KTKRTIGZSA-N 0.000 description 2
- OIRFIBZVTFIPSF-XEKZTXPJSA-N Oleyl linolenate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/C\C=C/C\C=C/CC OIRFIBZVTFIPSF-XEKZTXPJSA-N 0.000 description 2
- 229920006311 Urethane elastomer Polymers 0.000 description 2
- ULBTUVJTXULMLP-UHFFFAOYSA-N butyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCC ULBTUVJTXULMLP-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- AXOJRQLKMVSHHZ-UHFFFAOYSA-N methyl 1-methyl-1,2,3,6-tetrahydropyridin-1-ium-5-carboxylate;bromide Chemical compound Br.COC(=O)C1=CCCN(C)C1 AXOJRQLKMVSHHZ-UHFFFAOYSA-N 0.000 description 2
- 229940055577 oleyl alcohol Drugs 0.000 description 2
- XMLQWXUVTXCDDL-UHFFFAOYSA-N oleyl alcohol Natural products CCCCCCC=CCCCCCCCCCCO XMLQWXUVTXCDDL-UHFFFAOYSA-N 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 150000004671 saturated fatty acids Chemical class 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
- NZXZINXFUSKTPH-UHFFFAOYSA-N 4-[4-(4-butylcyclohexyl)cyclohexyl]-1,2-difluorobenzene Chemical compound C1CC(CCCC)CCC1C1CCC(C=2C=C(F)C(F)=CC=2)CC1 NZXZINXFUSKTPH-UHFFFAOYSA-N 0.000 description 1
- SPBDXSGPUHCETR-JFUDTMANSA-N 8883yp2r6d Chemical compound O1[C@@H](C)[C@H](O)[C@@H](OC)C[C@@H]1O[C@@H]1[C@@H](OC)C[C@H](O[C@@H]2C(=C/C[C@@H]3C[C@@H](C[C@@]4(O[C@@H]([C@@H](C)CC4)C(C)C)O3)OC(=O)[C@@H]3C=C(C)[C@@H](O)[C@H]4OC\C([C@@]34O)=C/C=C/[C@@H]2C)/C)O[C@H]1C.C1C[C@H](C)[C@@H]([C@@H](C)CC)O[C@@]21O[C@H](C\C=C(C)\[C@@H](O[C@@H]1O[C@@H](C)[C@H](O[C@@H]3O[C@@H](C)[C@H](O)[C@@H](OC)C3)[C@@H](OC)C1)[C@@H](C)\C=C\C=C/1[C@]3([C@H](C(=O)O4)C=C(C)[C@@H](O)[C@H]3OC\1)O)C[C@H]4C2 SPBDXSGPUHCETR-JFUDTMANSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-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
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 description 1
- 235000020661 alpha-linolenic acid Nutrition 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 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
- 230000007423 decrease Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 229960004488 linolenic acid Drugs 0.000 description 1
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003960 organic solvent Substances 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
- 230000002265 prevention Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 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
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
〔産業上の利用分野〕
この発明は磁気デイスク、磁気テープ等の磁気
記録媒体に関し、さらに詳しくは耐久性に優れた
磁気記録媒体に関する。
〔従来の技術〕
一般に、ポリエステルフイルムなどの基体上に
磁性粉末、結合剤樹脂、有機溶剤およびその他の
必要成分からなる磁性塗料を塗着してつくられる
磁気記録媒体は、記録再生時に磁気ヘツドおよび
パツドなどと激しく摺接するため磁性層が摩耗さ
れ易く、磁性層の摩耗が少なくて耐久性に優れた
ものが要求される。
このため磁性層の耐摩耗性を改善する一方策と
して磁性層中に種々の潤滑剤を混入することがお
こなわれており、たとえば、ステアリン酸−ｎ−
ブチルなどの飽和脂肪酸エステルを磁性層中に混
入したもの（特開昭55−117736号）や、オレイン
酸−ｎ−ブチルなどの不飽和脂肪酸エステルを磁
性層中に混入したもの（特開昭56−19525号）が
提案されている。
〔発明が解決しようとする問題点〕
ところが、ステアリン酸−ｎ−ブチルは飽和脂
肪酸と飽和アルコールとのエステルであり、また
オレイン酸−ｎ−ブチルは不飽和脂肪酸と飽和ア
ルコールとのエステルであつて、いずれも飽和脂
肪酸あるいは飽和アルコールを、脂肪酸成分また
はアルコール成分としているため、耐摩耗性の改
善が未だ充分ではなく、また長期間良好な潤滑効
果を持続できないという難点がある。
〔問題を解決するための手段〕
この発明はかかる事情に鑑み種々検討を行なつ
た結果なされたもので、オレイン酸などの不飽和
脂肪酸とオレイルアルコールなどの不飽和アルコ
ールとのエステルを磁性層中に含有させることに
よつて、磁性層の耐摩耗性を充分に向上させると
ともに、長期間その効果を持続させたものであ
る。
この発明において使用される不飽和脂肪酸と不
飽和アルコールとのエステルは、分子中の脂肪酸
部分とアルコール部分とに各１箇所以上づつ複数
の炭素二重結合がバランス良く配置されているた
め、分子鎖が適当な立体構造となつて隣接する分
子間の相互作用が格段に小さくなり、少々の温度
の低下あるいは分子量の増大によつても凝固する
ことが少ない。そのため、分子量の大きなものを
用いることによつて、揮発性を小さくすることが
でき、凝固しにくくかつ揮発し難い液状状態を保
つことができる。しかして、かかる不飽和脂肪酸
と不飽和アルコールとのエステルを磁性層中に含
有させると、長期にわたつて優れた潤滑効果が発
揮され、磁性層の耐摩耗性が充分に向上されると
ともに、長期間その効果が持続される。
このような効果は、磁性粉末に対して0.1重量
％以上の不飽和脂肪酸と不飽和アルコールとのエ
ステルを磁性層中に含有させることによつて発揮
され、含有酸が増加するにともなつてその効果が
顕著になるが、含有量が磁性粉末に対して20重量
％以上になると磁性層表面にブリードアウトして
磁気ヘツドを汚染し、出力を低下させるため、磁
性粉末に対して0.1〜20重量％の範囲内で磁性層
中に含有させるのが好ましい。
このような不飽和脂肪酸と不飽和アルコールと
のエステルにおける不飽和脂肪酸成分としては、
オレイン酸、エライジン酸、リノール酸、リノレ
ン酸などが好適なものとして挙げられ、中でもオ
レイン酸が最も好ましいものとして挙げられる。
また、不飽和アルコール成分としては、オレイル
アルコールなどが挙げられる。これらの不飽和脂
肪酸成分と不飽和アルコール成分とのエステルの
具体例としては、たとえば、オレイン酸オレイ
ル、エライジン酸オレイル、リノール酸オレイ
ル、リノレン酸オレイル等が挙げられる。
このような不飽和脂肪物酸と不飽和アルコール
とのエステルを磁性層中に含有させるには、これ
をノルマルヘキサンなどの適当な溶剤に溶解し、
溶解によつて得られた溶液を予め形成した磁性層
に塗布もしくは噴霧するか、或いは逆に磁性層を
上記溶液中に浸漬して行えばよく、またこれを磁
性粉末および結合剤樹脂とともに混練して磁性層
を形成することにより含有させてもよい。
〔実施例〕
次に、この発明の実施例について説明する。
実施例 １
Co含有γ−Fe2O3磁性粉末 270重量部
VAGH（米国U.C.C社製、塩化ビニル−酢
酸ビニル−ビニルアルコール共重合体）
80〃
N1432J（日本ゼオン社製、アクリロニトリ
ル−ブタジエン共重合体） 15〃
コロネートＬ（日本ポリウレタン工業社製、
三官能性低分子量イソシアネート化合物）
10〃
HS−500（旭カーボン社製、カーボンブラ
ツク） 34〃
α−Al2O3粉末 11〃
メチルイソブチルケトン 420〃
トルエン 420〃
この組成物をボールミル中で混合分散して磁性
塗料を調整し、この磁性塗料を厚さ75μのポリエ
ステルフイルム両面に乾燥厚が3μとなるように
塗布、乾燥して磁性層を形成した。次いで、これ
をオレイン酸オレイル50重量部、ノルマルヘキサ
ン1000重量部からなる含浸溶液に短時間浸漬し、
乾燥後円板状に打ち抜いて磁気デイスクをつくつ
た。
実施例 ２
実施例１における磁性塗料の組成において、
VAGHの使用量を80重量部から40重量部に、ま
たコロネートＬの使用量を10重量部から20重量部
にそれぞれ変更し、N1432Jを省き、新たにパン
デツクスＴ−5201（大日本インキ化学工業社製、
ウレタンエラストマー）を40重量部加えた以外
は、実施例１と同様にして磁気デイスクをつくつ
た。
実施例 ３
実施例１における磁性塗料の組成において、オ
レイン酸オレイルを15重量部新たに加え、含浸溶
液への浸漬処理を省いた以外は、実施例１と同様
にして磁気デイスクをつくつた。
実施例 ４
実施例１における含浸溶液の組成において、オ
レイン酸オレイルに代えて、エライジン酸オレイ
ルを同量使用した以外は、実施例１と同様にして
磁気デイスクをつくつた。
実施例 ５
実施例１における含浸溶液の組成において、オ
レイン酸オレイルに代えてリノール酸オレイルを
同量使用した以外は、実施例１と同様にして磁気
デイスクをつくつた。
実施例 ６
実施例１における含浸溶液の組成において、オ
レイン酸オレイルに代えて、リノレン酸オレイル
を同量使用した以外は、実施例１と同様にして磁
気デイスクをつくつた。
比較例 １
実施例１における含浸溶液の組成において、オ
レイン酸オレイルに代えてオレイン酸−ｎ−ブチ
ルを同量使用した以外は、実施例１と同様にして
磁気デイスクをつくつた。
比較例 ２
実施例１における含浸溶液の組成において、オ
レイン酸オレイルに代えてステアリン酸オレイル
を同量使用した以外は、実施例１と同様にして磁
気デイスクをつくつた。
比較例 ３
実施例１における含浸溶液の組成において、オ
レイン酸オレイルに代えてステアリン酸−ｎ−ブ
チルを同量使用した以外は、実施例１と同様にし
て磁気デイスクをつくつた。
各実施例および各比較例で得られた磁気デイス
クについて耐久性を調べるため、各磁気デイスク
を汚れ防止用ジヤケツトに挿入して記録再生装置
に装填し、磁気ヘツドをパツド圧25ｇ／cm2で接触
させて周速10ｍ／secで摺接させながら再生出力
が初期出力の50％になるまでの走行時間を測定し
た。また潤滑持続効果を調べるため磁気デイスク
を60℃の環境に30日間放置して潤滑剤の揮散量を
測定し、初期含浸量に対する百分率で表した。
下表はその結果である。
[Industrial Application Field] The present invention relates to magnetic recording media such as magnetic disks and magnetic tapes, and more particularly to magnetic recording media with excellent durability. [Prior Art] Generally, magnetic recording media are made by coating a magnetic paint consisting of magnetic powder, binder resin, organic solvent, and other necessary components on a substrate such as a polyester film. The magnetic layer is easily abraded due to violent sliding contact with pads, etc., and a magnetic layer with low abrasion and excellent durability is required. Therefore, as a measure to improve the wear resistance of the magnetic layer, various lubricants are mixed into the magnetic layer. For example, stearic acid-n-
One in which a saturated fatty acid ester such as butyl is mixed into the magnetic layer (Japanese Patent Laid-Open No. 117736/1989), and one in which an unsaturated fatty acid ester such as n-butyl oleate is mixed into the magnetic layer (Japanese Patent Laid-Open No. 56-11773) -19525) is proposed. [Problems to be solved by the invention] However, n-butyl stearate is an ester of a saturated fatty acid and a saturated alcohol, and n-butyl oleate is an ester of an unsaturated fatty acid and a saturated alcohol. Both of them use saturated fatty acids or saturated alcohols as the fatty acid component or alcohol component, so they have the disadvantage that the improvement in wear resistance is not yet sufficient and that good lubricating effects cannot be maintained for a long period of time. [Means for Solving the Problem] This invention was made as a result of various studies in view of the above circumstances, and consists of using an ester of an unsaturated fatty acid such as oleic acid and an unsaturated alcohol such as oleyl alcohol in the magnetic layer. By incorporating it into the magnetic layer, the wear resistance of the magnetic layer is sufficiently improved, and the effect is maintained for a long period of time. The ester of unsaturated fatty acid and unsaturated alcohol used in this invention has multiple carbon double bonds arranged in a well-balanced manner in the fatty acid part and the alcohol part in the molecule, so the molecular chain has an appropriate three-dimensional structure, and the interaction between adjacent molecules becomes much smaller, so that it is less likely to coagulate even when the temperature is slightly lowered or the molecular weight is increased. Therefore, by using a material with a large molecular weight, volatility can be reduced, and a liquid state that is difficult to coagulate and difficult to volatilize can be maintained. Therefore, when such an ester of unsaturated fatty acid and unsaturated alcohol is contained in the magnetic layer, an excellent lubricating effect is exhibited over a long period of time, and the wear resistance of the magnetic layer is sufficiently improved. The effect lasts for a period of time. Such an effect is achieved by containing an ester of unsaturated fatty acid and unsaturated alcohol in the magnetic layer in an amount of 0.1% or more by weight based on the magnetic powder, and as the acid content increases, the effect decreases. The effect will be noticeable, but if the content exceeds 20% by weight based on the magnetic powder, it will bleed out onto the surface of the magnetic layer, contaminating the magnetic head, and reducing the output. % in the magnetic layer. The unsaturated fatty acid component in such an ester of unsaturated fatty acid and unsaturated alcohol is as follows:
Preferred examples include oleic acid, elaidic acid, linoleic acid, and linolenic acid, with oleic acid being the most preferred.
Further, examples of the unsaturated alcohol component include oleyl alcohol. Specific examples of esters of these unsaturated fatty acid components and unsaturated alcohol components include oleyl oleate, oleyl elaidate, oleyl linoleate, and oleyl linolenate. In order to incorporate such an ester of an unsaturated fatty acid and an unsaturated alcohol into the magnetic layer, it is dissolved in a suitable solvent such as n-hexane.
The solution obtained by dissolution may be applied or sprayed onto a previously formed magnetic layer, or conversely, the magnetic layer may be immersed in the solution, or this may be kneaded with magnetic powder and a binder resin. It may also be incorporated by forming a magnetic layer. [Example] Next, an example of the present invention will be described. Example 1 Co-containing γ-Fe 2 O 3 magnetic powder 270 parts by weight VAGH (manufactured by UCC, USA, vinyl chloride-vinyl acetate-vinyl alcohol copolymer)
80〃 N1432J (manufactured by Nippon Zeon Co., Ltd., acrylonitrile-butadiene copolymer) 15〃 Coronate L (manufactured by Nippon Polyurethane Industries Co., Ltd.,
trifunctional low molecular weight isocyanate compound)
10〃 HS-500 (manufactured by Asahi Carbon Co., Ltd., carbon black) 34〃 α-Al 2 O 3 powder 11〃 Methyl isobutyl ketone 420〃 Toluene 420〃 This composition was mixed and dispersed in a ball mill to prepare a magnetic paint, This magnetic paint was applied to both sides of a 75 μm thick polyester film to a dry thickness of 3 μm, and dried to form a magnetic layer. Next, this was immersed for a short time in an impregnating solution consisting of 50 parts by weight of oleyl oleate and 1000 parts by weight of n-hexane.
After drying, it was punched out into a disk shape to make a magnetic disk. Example 2 In the composition of the magnetic paint in Example 1,
The amount of VAGH used was changed from 80 parts by weight to 40 parts by weight, the amount of Coronate L used was changed from 10 parts by weight to 20 parts by weight, N1432J was omitted, and Pandex T-5201 (Dainippon Ink Chemical Industry Co., Ltd. Made by
A magnetic disk was prepared in the same manner as in Example 1, except that 40 parts by weight of urethane elastomer (urethane elastomer) was added. Example 3 A magnetic disk was produced in the same manner as in Example 1, except that 15 parts by weight of oleyl oleate was newly added to the composition of the magnetic paint in Example 1, and the immersion treatment in the impregnating solution was omitted. Example 4 A magnetic disk was produced in the same manner as in Example 1, except that in the composition of the impregnating solution in Example 1, the same amount of oleyl elaidate was used in place of oleyl oleate. Example 5 A magnetic disk was produced in the same manner as in Example 1, except that the same amount of oleyl linoleate was used in place of oleyl oleate in the composition of the impregnating solution in Example 1. Example 6 A magnetic disk was produced in the same manner as in Example 1 except that the same amount of oleyl linolenate was used in place of oleyl oleate in the composition of the impregnating solution in Example 1. Comparative Example 1 A magnetic disk was produced in the same manner as in Example 1, except that the same amount of n-butyl oleate was used in place of oleyl oleate in the composition of the impregnating solution in Example 1. Comparative Example 2 A magnetic disk was produced in the same manner as in Example 1, except that in the composition of the impregnating solution in Example 1, the same amount of oleyl stearate was used in place of oleyl oleate. Comparative Example 3 A magnetic disk was produced in the same manner as in Example 1, except that the same amount of n-butyl stearate was used in place of oleyl oleate in the composition of the impregnating solution in Example 1. In order to examine the durability of the magnetic disks obtained in each example and each comparative example, each magnetic disk was inserted into a dirt prevention jacket, loaded into a recording/reproducing device, and the magnetic head was contacted with a pad pressure of 25 g/cm 2 . The running time until the regenerated output reached 50% of the initial output was measured while sliding contact at a circumferential speed of 10 m/sec. In addition, in order to investigate the lubrication-sustaining effect, the magnetic disk was left in an environment at 60°C for 30 days, and the amount of lubricant volatilized was measured and expressed as a percentage of the initial impregnated amount. The table below shows the results.
上表から明らかなように、この発明によつて得
られた磁気デイスク（実施例１〜６）はいずれも
従来の磁気デイスク（比較例１〜３）に比し、走
行時間が長くて潤滑持続効果もよく、特に、不飽
和脂肪酸と不飽和アルコールとのエステルである
オレイン酸オレイルを用いた実施例１は、不飽和
脂肪酸と飽和アルコールとのエステルであるオレ
イン酸−ｎ−ブチルを用いた比較例１に対し、他
は同条件であるに拘わらず走行時間が大巾に長く
なり、揮発も認められない。このことからこの発
明によつて得られる磁気記録媒体は耐久性に優れ
かつその効果が長時間にわたつて持続されるのが
わかる。
As is clear from the above table, all of the magnetic disks obtained by the present invention (Examples 1 to 6) have longer running times and longer lubrication duration than conventional magnetic disks (Comparative Examples 1 to 3). The effect is good, and in particular, Example 1 using oleyl oleate, which is an ester of an unsaturated fatty acid and an unsaturated alcohol, is better than the comparison using n-butyl oleate, which is an ester of an unsaturated fatty acid and a saturated alcohol. Compared to Example 1, even though the other conditions were the same, the running time was significantly longer and no volatilization was observed. This shows that the magnetic recording medium obtained by the present invention has excellent durability and its effects are maintained over a long period of time.
Claims (1)
填剤とともに、不飽和脂肪酸と不飽和アルコール
とのエステルを含ませたことを特徴とする磁気記
録媒体 ２ 不飽和脂肪酸と不飽和アルコールとのエステ
ルがオレイン酸オレイルである特許請求の範囲第
１項記載の磁気記録媒体 ３ 不飽和脂肪酸と不飽和アルコールとのエステ
ルを磁性粉末に対して0.1〜20重量％含有させた
特許請求の範囲第１項および第２項記載の磁気記
録媒体。[Claims] 1. A magnetic recording medium characterized in that the magnetic layer contains an ester of an unsaturated fatty acid and an unsaturated alcohol together with a magnetic powder, a binder resin, and a filler. 2. An unsaturated fatty acid and an unsaturated alcohol. Magnetic recording medium 3 according to claim 1, wherein the ester with an unsaturated alcohol is oleyl oleate.A patent in which the ester of an unsaturated fatty acid and an unsaturated alcohol is contained in an amount of 0.1 to 20% by weight based on the magnetic powder. A magnetic recording medium according to claims 1 and 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57045140A JPS58164025A (en) | 1982-03-20 | 1982-03-20 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57045140A JPS58164025A (en) | 1982-03-20 | 1982-03-20 | Magnetic recording medium |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5142996A Division JPH076352A (en) | 1993-05-21 | 1993-05-21 | Magnetic disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58164025A JPS58164025A (en) | 1983-09-28 |
| JPH0449171B2 true JPH0449171B2 (en) | 1992-08-10 |
Family
ID=12710971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57045140A Granted JPS58164025A (en) | 1982-03-20 | 1982-03-20 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58164025A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59186131A (en) * | 1983-04-06 | 1984-10-22 | Tdk Corp | Magnetic recording medium |
| JPH079698B2 (en) * | 1985-02-08 | 1995-02-01 | 日立マクセル株式会社 | Magnetic recording medium |
| JPH0740425B2 (en) * | 1985-04-30 | 1995-05-01 | 日立マクセル株式会社 | Floppy disk |
| JPH0785304B2 (en) * | 1985-10-15 | 1995-09-13 | 日立マクセル株式会社 | Magnetic disk |
| JPH0736216B2 (en) * | 1985-10-15 | 1995-04-19 | 日立マクセル株式会社 | Magnetic disk |
| JPH076352A (en) * | 1993-05-21 | 1995-01-10 | Hitachi Maxell Ltd | Magnetic disk |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55117736A (en) * | 1979-03-03 | 1980-09-10 | Hitachi Maxell Ltd | Magnetic recording medium |
-
1982
- 1982-03-20 JP JP57045140A patent/JPS58164025A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55117736A (en) * | 1979-03-03 | 1980-09-10 | Hitachi Maxell Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58164025A (en) | 1983-09-28 |
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