JPS63171421A - Magnetic recording medium and its production - Google Patents
Magnetic recording medium and its productionInfo
- Publication number
- JPS63171421A JPS63171421A JP267987A JP267987A JPS63171421A JP S63171421 A JPS63171421 A JP S63171421A JP 267987 A JP267987 A JP 267987A JP 267987 A JP267987 A JP 267987A JP S63171421 A JPS63171421 A JP S63171421A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- ions
- layer
- recording medium
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 150000002500 ions Chemical class 0.000 claims abstract description 32
- 229920005989 resin Polymers 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims abstract description 21
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 239000012298 atmosphere Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000010000 carbonizing Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 229910003481 amorphous carbon Inorganic materials 0.000 abstract description 4
- 238000005468 ion implantation Methods 0.000 description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000006247 magnetic powder Substances 0.000 description 9
- 239000003973 paint Substances 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 239000006229 carbon black Substances 0.000 description 6
- 229920006267 polyester film Polymers 0.000 description 6
- -1 Ar+ Chemical class 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000002216 antistatic agent Substances 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 2
- 235000021360 Myristic acid Nutrition 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 229920001220 nitrocellulos Polymers 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 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
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 229920006311 Urethane elastomer Polymers 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
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- ULBTUVJTXULMLP-UHFFFAOYSA-N butyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCC ULBTUVJTXULMLP-UHFFFAOYSA-N 0.000 description 1
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は磁気記録媒体に関し、さらに詳しくは表面電
気抵抗が小さくて電磁変換特性に優れた磁気記録媒体お
よびその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium with low surface electrical resistance and excellent electromagnetic conversion characteristics, and a method for manufacturing the same.
磁気記録媒体の磁性層は、通常、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
ポリエステルフィルムなどの基体上に塗布し、乾燥する
ことによって形成されるが、このようにして形成される
磁性層は、その表面電気抵抗が比較的高くて帯電しやす
く、放電時にノイズを発生したり、塵埃が付着してドロ
ップアウトが増加したりし、磁気テープの場合走行中に
はりつき現象などが生じる。The magnetic layer of a magnetic recording medium is usually formed by applying a magnetic paint consisting of magnetic powder, binder resin, organic solvent, and other necessary components onto a substrate such as a polyester film and drying it. The magnetic layer formed by the magnetic tape has a relatively high surface electrical resistance and is easily charged, which can generate noise during discharge and increase dropouts due to dust adhesion. A phenomenon such as sticking occurs.
そこで、その対策として磁性層中にカーボンブラックを
含有させたり（特公昭５８−３１６５４号）、または磁
性層中に帯電防止剤を含有させたり（特公昭５８−５４
５６号）、あるいは基体と磁性層との間にカーボンブラ
ックを含有した下塗層を設けたり（特開昭６０−３８２
７３号）、さらには基体の磁性層側とは反対の裏面にカ
ーボンブラックを含有したバックコート層を形成する（
特公昭５７−１９４９２号）などして磁性層の表面電気
抵抗を低減することが行われている。Therefore, as a countermeasure to this, carbon black is contained in the magnetic layer (Japanese Patent Publication No. 58-31654) or an antistatic agent is contained in the magnetic layer (Japanese Patent Publication No. 58-54).
No. 56), or an undercoat layer containing carbon black is provided between the substrate and the magnetic layer (Japanese Patent Application Laid-Open No. 60-382).
No. 73), and furthermore, a back coat layer containing carbon black is formed on the back surface of the substrate opposite to the magnetic layer side (
Japanese Patent Publication No. 57-19492) has been used to reduce the surface electrical resistance of the magnetic layer.
ところが、これらの方法では、磁性層の表面電気抵抗が
低減されるものの、いまひとつ充分に満足できるもので
はなかった。However, although these methods reduce the surface electrical resistance of the magnetic layer, they are not completely satisfactory.
この発明は、かかる現状に鑑み種々検討を行った結果な
されたもので、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ポリエステルフィ
ルムなどの基体上に塗布し、乾燥して形成される磁性層
の表面に、真空雰囲気下でイオンを注入するなどの方法
で、結合剤樹脂を含む磁性層の表面を炭化して炭化層を
形成することによって、磁気記録媒体の電気抵抗を充分
に低減し、電磁変換特性を向上させたものである。This invention was made as a result of various studies in view of the current situation. A magnetic paint consisting of magnetic powder, binder resin, organic solvent, and other necessary components is applied onto a substrate such as a polyester film, and then dried. The electrical resistance of the magnetic recording medium is improved by carbonizing the surface of the magnetic layer containing the binder resin to form a carbonized layer, such as by implanting ions in a vacuum atmosphere. The electromagnetic conversion characteristics are improved.
以下、図面を参照しながらこの発明について説明する。The present invention will be described below with reference to the drawings.
第１図はイオン注入装置の概略断面図を示したもので、
このイオン注入装置は、イオン源ガス導入口１を設けた
イオン発生室２と、イオン発生室２で発生させたイオン
を加速して所定の方向に導く加速器３と、加速器３で加
速されたイオンを質量によって分離し、必要なイオンを
取り出す質量分離器４と、質量分離器４で分離して取り
出されたイオンをビーム走査するビーム走査室５と、イ
オン注入室６とから構成され、イオン注入室６内にセッ
トした磁気記録媒体７の結合剤樹脂を含む磁性層に、真
空雰囲気下で、イオンが打ち込まれ、磁性層の表面が炭
化される。８はビーム走査室５を真空排気するための排
気系であり、９はイオン注入室６を真空排気するための
排気系である。Figure 1 shows a schematic cross-sectional view of the ion implanter.
This ion implantation apparatus includes an ion generation chamber 2 provided with an ion source gas inlet 1, an accelerator 3 that accelerates ions generated in the ion generation chamber 2 and guides them in a predetermined direction, and ions accelerated by the accelerator 3. It consists of a mass separator 4 that separates the ions by mass and extracts the necessary ions, a beam scanning chamber 5 that beam-scans the ions separated and extracted by the mass separator 4, and an ion implantation chamber 6. Ions are implanted into the magnetic layer containing binder resin of the magnetic recording medium 7 set in the chamber 6 in a vacuum atmosphere, and the surface of the magnetic layer is carbonized. 8 is an exhaust system for evacuating the beam scanning chamber 5, and 9 is an exhaust system for evacuating the ion implantation chamber 6.
このようにイオン注入装置を使用して、ポリエステルフ
ィルム上に塗布形成された磁性層の表面に、真空雰囲気
下でイ゛オンが注入されると、結合剤樹脂を含む磁性層
の表面が高エネルギーのイオンにより炭化されてアモル
ファスカーボンが生成され、炭化層が形成される。この
磁性層の表面に形成されたアモルファスカーボンからな
る炭化層は、導電性が良好で優れた帯電防止機能を有す
るため、この炭化層が磁性層の表面に形成されると、磁
気記録媒体の電気抵抗が充分に低減され、帯電によるノ
イズの発生やドロップアウトの増加が効果的に抑制され
、走行中のはりつきも生ぜず、電磁変換特性が充分に向
上される。When ions are injected into the surface of a magnetic layer coated on a polyester film in a vacuum atmosphere using an ion implantation device, the surface of the magnetic layer containing the binder resin is exposed to high energy. is carbonized by the ions to produce amorphous carbon and form a carbonized layer. The carbonized layer made of amorphous carbon formed on the surface of the magnetic layer has good conductivity and excellent antistatic function. The resistance is sufficiently reduced, the generation of noise due to charging and the increase in dropout are effectively suppressed, no sticking occurs during running, and the electromagnetic conversion characteristics are sufficiently improved.
このようなポリエステルフィルム上に塗′布形成された
結合剤樹脂を含む磁性層へのイオンの注入は、Ｉ Ｘ
１０−５〜Ｉ Ｘ １０−’Ｔｏｒｒ程度の真空中で行
われ、イオン種は特に限定されることなく、たとえば、
Ａ ｒ＋、Ｎ２＋、Ｔｉ＋、Ｓｉ中等のイオンがいずれ
も好適に使用される。また、イオン注入の際の加速電圧
はｌ０ＫＶより低い加速電圧ではイオンに与えられるエ
ネルギーが小さすぎ、結合剤樹脂を含む磁性層の表面部
が良好に炭化されないため、帯電防止が充分に発揮され
ず、反対に１０ＭＶより高い加速電圧ではイオンに与え
られるエネルギーが大きすぎ、磁性層および基体を通過
してしまって良好な帯電防止効果が得られない。このた
めＩＱＫＶ〜ＩＯＭＶの範囲内にするのが好ましく、５
０〜５０００ＫＶで行うのがより好ましい。このような
条件下でのイオン注入量は、１０１３個／ｃＪ−１０２
０個／ｄの範囲内であることが好ましく、１０１５個／
ｄ〜１０１８個／ｄの範囲内となるようにするのがより
好ましい。Ion implantation into a magnetic layer containing a binder resin formed by coating on such a polyester film is performed by IX
It is carried out in a vacuum of about 10-5 to I x 10-'Torr, and the ion species are not particularly limited, for example,
Ions such as Ar+, N2+, Ti+, and Si are preferably used. In addition, if the acceleration voltage during ion implantation is lower than 10KV, the energy given to the ions is too small and the surface part of the magnetic layer containing the binder resin is not carbonized well, resulting in insufficient antistatic properties. On the other hand, at an accelerating voltage higher than 10 MV, the energy imparted to the ions is too large and passes through the magnetic layer and the substrate, making it impossible to obtain a good antistatic effect. For this reason, it is preferable to set it within the range of IQKV to IOMV, and 5
It is more preferable to carry out at 0 to 5000 KV. The ion implantation amount under these conditions is 1013 ions/cJ-102
It is preferably within the range of 0 pieces/d, and 1015 pieces/d.
More preferably, the number is within the range of d to 1018 pieces/d.
なお、結合剤樹脂を含む磁性層表面の炭化はこのように
イオンを注入して行われる他、電子線、ラジカル線など
の高速エネルギー線によっても行うことができ、これら
の電子線、ラジカル線などの高速エネルギー線によって
、磁性層の表面を炭化した場合も、前記のイオンを注入
して炭化を行う場合と同様に炭化層が形成されて同様な
効果が得られる。The surface of the magnetic layer containing the binder resin can be carbonized by implanting ions as described above, but it can also be done by high-speed energy beams such as electron beams and radical beams. When the surface of the magnetic layer is carbonized using high-speed energy rays, a carbonized layer is formed and the same effect can be obtained as in the case where carbonization is performed by implanting ions.
このようにして結合剤樹脂を含む磁性層表面の炭化によ
って形成される炭化層の厚みは、１００〜１００００人
の範囲内であることが好ましく、薄すぎると所期の効果
が得られず、厚すぎると磁性層表面より炭化層が脱落し
、ヘッド目詰まり等の問題が生じる。The thickness of the carbonized layer thus formed by carbonization of the surface of the magnetic layer containing binder resin is preferably within the range of 100 to 10,000. If it is too thin, the desired effect will not be obtained; If too much is used, the carbonized layer will fall off from the surface of the magnetic layer, causing problems such as head clogging.
磁性層の形成は、常法に準じて行われ、例えば、ポリエ
ステルフィ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を含む磁性塗料を、
吹きつけもしくはロール塗など、適宜手段で塗布し、乾
燥して形成される。The magnetic layer is formed according to a conventional method, for example, by applying a magnetic paint containing magnetic powder, a binder resin, an organic solvent, and other necessary components on a substrate such as a polyester film.
It is formed by applying by appropriate means such as spraying or roll coating and drying.
ここで使用される磁性粉末としては、たとえば、ｒ−Ｆ
ｅ２０３粉末、Ｆｅ、Ｏ，粉末、Ｃｏ含有ｒ−Ｆｅ２０
３粉末、Ｃｏ含有Ｆｅ３Ｏ４粉末、ＣｒＯ２粉末、Ｆｅ
粉末、Ｃｏ粉末、Ｆｅ−Ｎｉ粉末など、従来公知の各種
磁性粉末が広く包含される。The magnetic powder used here includes, for example, r-F
e203 powder, Fe, O, powder, Co containing r-Fe20
3 powder, Co-containing Fe3O4 powder, CrO2 powder, Fe
A wide variety of conventionally known magnetic powders are included, such as powder, Co powder, and Fe-Ni powder.
また、結合剤樹脂としては、塩化ビニル−酢酸ビニル系
共重合体、ポリビニルアセクール系樹脂、繊維素系樹脂
、ポリウレタン系樹脂、ポリエステル系樹脂、アクリル
系樹脂、ゴム系樹脂、イソシアネート化合物、放射線硬
化型樹脂など、通常、磁性粉末の結合剤樹脂として使用
されるものが広く使用される。In addition, binder resins include vinyl chloride-vinyl acetate copolymers, polyvinyl acecool resins, cellulose resins, polyurethane resins, polyester resins, acrylic resins, rubber resins, isocyanate compounds, and radiation-cured resins. Type resins, which are normally used as binder resins for magnetic powders, are widely used.
有機溶剤としては、シクロヘキサノン、メチルイソブチ
ルケトン、メチルエチルケトンなどのケトン系溶剤、酢
酸エチル、酢酸ブチルなどのエステル系溶剤、ベンゼン
、キシレン、トルエンなどの芳香族炭化水素系溶剤、ジ
メチルスルホキシドなどのスルホキシド系溶剤、テトラ
ヒドロフラン、ジオキサンなどのエーテル系溶剤など、
使用する結合剤樹脂を溶解するのに適した溶剤が、特に
限定されることなく、単独または二種以上混合して使用
される。Examples of organic solvents include ketone solvents such as cyclohexanone, methyl isobutyl ketone, and methyl ethyl ketone, ester solvents such as ethyl acetate and butyl acetate, aromatic hydrocarbon solvents such as benzene, xylene, and toluene, and sulfoxide solvents such as dimethyl sulfoxide. , ether solvents such as tetrahydrofuran, dioxane, etc.
Solvents suitable for dissolving the binder resin to be used are not particularly limited, and may be used alone or in combination of two or more.
なお、磁性塗料中には、通常使用されている各種添加剤
、たとえば、分散剤、潤滑剤、研磨剤、帯電防止剤など
を適宜に添加使用してもよい。In addition, various commonly used additives such as dispersants, lubricants, abrasives, antistatic agents, etc. may be appropriately added to the magnetic paint.
このようにして、基体上に塗布形成した結合剤樹脂を含
む磁性層の表面を炭化して、磁性層の表面に炭化層を形
成すると、磁性層表面に形成したアモルファスカーボン
からなる炭化層によって、帯電防止機能が充分に発揮さ
れて、磁気記録媒体の電気抵抗が充分に低減され、帯電
によるノイズやドロップアウトの増加が効果的に抑制さ
れ、走行中のはりつきも生じない。またこのような炭化
層を磁性層の表面に形成すると、磁性層中に帯電防止の
ための大量のカーボンブラックや帯電防止剤を含有させ
る必要もなく、磁性層の表面性が良好になるため、電磁
変換特性が良好になり、またカーボンブラックを含む下
塗層やバックコート層を形成したりする必要もないため
、磁気記録媒体の全厚を薄くすることができ、電磁変換
特性が良好でしかも長時間記録再生が行える磁気記録媒
体が得られる。In this way, when the surface of the magnetic layer containing the binder resin coated on the substrate is carbonized to form a carbonized layer on the surface of the magnetic layer, the carbonized layer made of amorphous carbon formed on the surface of the magnetic layer causes The antistatic function is fully exhibited, the electrical resistance of the magnetic recording medium is sufficiently reduced, the increase in noise and dropout due to charging is effectively suppressed, and sticking during running does not occur. Furthermore, when such a carbonized layer is formed on the surface of the magnetic layer, there is no need to include a large amount of carbon black or antistatic agent in the magnetic layer to prevent static electricity, and the surface properties of the magnetic layer are improved. The electromagnetic conversion properties are improved, and since there is no need to form an undercoat layer or back coat layer containing carbon black, the total thickness of the magnetic recording medium can be made thinner, and the electromagnetic conversion properties are improved. A magnetic recording medium capable of long-term recording and reproduction can be obtained.
次に、この発明の実施例について説明する。 Next, embodiments of the invention will be described.
実施例１
α−Ｆｅ磁性粉末（粒子径 ８００重量部０．１μ
ｍ、軸比１０）
エスレックＡ（接水化学工業社 １００〃製、塩化ビニ
ル−酢酸ビニル
一ビニルアルコール共Ｔｍ合体）
バンデックスＴ−５２５０（大日本 ６０〃インキ化
学工業社製、ウレタ
ンエラストマー）
コロネートＬ（日本ポリウレタ ４０〃ン工業社製、
三官能性低分子
量イソシアネート化合物）
ＡＯ３−４８（住友化学社製、 ４８〃Ａｌ２Ｏ３粉
末）
ミリスチン酸 ３２〃ステアリン
酸−ｎ−ブチル １６〃シクロヘキサノン
１１００ 〃トルエン
１１００ ”これらの組成物をボールミル中で７２
時間混合分散して磁性塗料を調製した。この磁性塗料を
、厚さ１０μｍのポリエステルフィルム上に乾燥厚が３
．０μｍとなるように塗布、乾燥して磁性層を形成し、
表面平滑化処理を行って、磁気記録媒体の原反をつくっ
た。Example 1 α-Fe magnetic powder (particle size 800 parts by weight 0.1μ
m, axial ratio 10) S-LEC A (manufactured by Suisui Kagaku Kogyo Co., Ltd. 100, vinyl chloride-vinyl acetate-vinyl alcohol co-Tm combination) Vandex T-5250 (manufactured by Dainippon 60〃Ink Kagaku Kogyo Co., Ltd., urethane elastomer) Coronate L (manufactured by Nippon Polyurethane Industry Co., Ltd.,
trifunctional low molecular weight isocyanate compound) AO3-48 (manufactured by Sumitomo Chemical Co., Ltd., 48 Al2O3 powder) myristic acid 32 n-butyl stearate 16 cyclohexanone
1100 Toluene
1100" these compositions in a ball mill at 72"
A magnetic paint was prepared by time mixing and dispersion. This magnetic paint was applied to a dry thickness of 3 μm on a polyester film with a thickness of 10 μm.
．． Coating to a thickness of 0 μm and drying to form a magnetic layer,
A surface smoothing treatment was performed to produce a raw material for a magnetic recording medium.
次いで、この磁気記録媒体の原反を、第１図に示すイオ
ン注入装置のイオン注入室６内にセットして、Ｉ Ｘ
１０−５Ｔｏｒｒの真空雰囲気下に、加速電圧５００Ｋ
ＶでＡｒ＋を注入量１０１６個／ｃｉとなるように打ち
込んで炭化を行い、厚み５００人の炭化層を磁性層の表
面に形成した。しかる後これをイオン注入装置から取り
出し、８龍巾に裁餅して磁気テープをつくった。Next, this original magnetic recording medium is set in the ion implantation chamber 6 of the ion implantation apparatus shown in FIG.
Accelerating voltage 500K in a vacuum atmosphere of 10-5 Torr
Carbonization was performed by implanting Ar+ at a dose of 1016 atoms/ci at V to form a carbonized layer with a thickness of 500 mm on the surface of the magnetic layer. After that, it was taken out of the ion implanter and cut into 8-width pieces to make a magnetic tape.
実施例２
実施例１におけるイオン注入において、磁性層表面への
Ａｒ＋イオンの打ち込み量を１０１４個／ｄとした以外
は実施例１と同様にして磁気テープをつくった。Example 2 A magnetic tape was produced in the same manner as in Example 1, except that in the ion implantation in Example 1, the amount of Ar+ ions implanted into the surface of the magnetic layer was 1014 ions/d.
実施例３
実施例１における磁性塗料の組成において、α−Ｆｅ磁
性粉末に代えてＣｏ被着ＴＦｅ２０３磁性粉末を同量使
用し、またエスレフクＡに代えてニトロセルロースＨ−
１（旭化成工業社製、ニトロセルロース）を同量使用し
た以外は、実施例１と同様にして磁気記録媒体の原反を
つ（す、実施例１におけるイオン注入において、磁性層
表面へのＡｒ＋イオンの打ち込み量を１０１５個／ｄと
し、裁断中を８ｍｍから１／２インチ中に変更した以外
は実施例１と同様にして磁気テープをつくった。Example 3 In the composition of the magnetic paint in Example 1, the same amount of Co-coated TFe203 magnetic powder was used instead of α-Fe magnetic powder, and nitrocellulose H-
The original fabric of the magnetic recording medium was prepared in the same manner as in Example 1, except that the same amount of 1 (manufactured by Asahi Kasei Industries, Ltd., nitrocellulose) was used. A magnetic tape was produced in the same manner as in Example 1, except that the ion implantation amount was 1015 ions/d and the cutting process was changed from 8 mm to 1/2 inch.
比較例１
パルカンＸＣ−７２（キャボット ３００重量部社製、
カーボンブラック）
ＶＡＧＨ（Ｕ、Ｃ，Ｃ社製、塩化ビ １００〃ニル−酢
酸ビニル−ビニルア
ルコール共重合体）
Ｎ−２３０１（日本ポリウレタン ７０〃工業社製
、ウレタン樹脂）
コロネートしく日本ポリウレタ ３０〃ン工業社製、
三官能性低分子
量イソシアネート化合物）
ミリスチン酸 １０〃ステアリン
酸ｎ−ブチル ５ 〃シクロへキサノン
７５０〃トルエン ７５
０〃これらの組成物をボールミル中で７２時間混合分散
してバンクコート層塗料を調製し、実施例１で得られた
磁気記録媒体の原反の裏面に全厚１３．５μｍとなるよ
うに塗布、乾燥してバックコート層を形成した。しかる
後、８■ｌ巾に裁断しテープをつくった。Comparative Example 1 Palcan XC-72 (manufactured by Cabot 300 parts by weight,
Carbon black) VAGH (manufactured by U, C, C, vinyl chloride 100-vinyl acetate-vinyl alcohol copolymer) N-2301 (Japan Polyurethane 70, manufactured by Kogyo Co., Ltd., urethane resin) Coronate Japan Polyurethane 30 Manufactured by Kogyosha,
trifunctional low molecular weight isocyanate compound) myristic acid 10 n-butyl stearate 5 cyclohexanone
750 Toluene 75
0 These compositions were mixed and dispersed in a ball mill for 72 hours to prepare a bank coat layer paint, and applied to the back surface of the original magnetic recording medium obtained in Example 1 to a total thickness of 13.5 μm. , and dried to form a back coat layer. After that, I cut it into 8 liter width to make tape.
比較例２
実施例１において、磁性層へのＡｒ＋イオンの打ち込み
を行わず、磁性塗料の組成において、新たにパルカンＸ
Ｃ−７２（キャボソト社製、カーボンブランク）を４０
重量部加えた以外は実施例１と同様にして磁気テープを
つくった。Comparative Example 2 In Example 1, Ar+ ions were not implanted into the magnetic layer, and Palkan X was newly added to the composition of the magnetic paint.
40 C-72 (manufactured by Cabo Soto, carbon blank)
A magnetic tape was prepared in the same manner as in Example 1 except that parts by weight were added.
比較例３
実施例３において、磁性層へのＡｒ＋イオンの打ち込み
を行わず、磁性塗料の組成において、新たにパルカンＸ
Ｃ−７２（キャボット社製、カーボンブランク）を４０
重量部加えた以外は実施例３と同様にして磁気テープを
つくった。Comparative Example 3 In Example 3, Ar + ions were not implanted into the magnetic layer, and Palkan
40 C-72 (manufactured by Cabot, carbon blank)
A magnetic tape was produced in the same manner as in Example 3 except that parts by weight were added.
各実施例および比較例で得られた磁気テープについて、
電気抵抗を測定した。また８鰭巾の磁気テープは、記録
電流値を関節したソニー社製ＶＴＲ，ＣＣＤ−Ｖ８に装
填して、ビデオＳ／Ｎおよびドロップアウトを測定し、
１／２インチ中の磁気テープは、記録電流値を調節した
松下電気産業社製ＶＴＲ，ＡＣ−２００’６に装填して
、ビデオＳ／Ｎおよびドロップアウトを測定した。ドロ
ップアウトは大きさ５μｓ以上、１分間の平均値で表し
た。Regarding the magnetic tapes obtained in each example and comparative example,
Electrical resistance was measured. In addition, the 8-fin width magnetic tape was loaded into a Sony VTR and CCD-V8 with a recording current value, and the video S/N and dropout were measured.
The 1/2-inch magnetic tape was loaded into a Matsushita Electric Industrial Co., Ltd. VTR, AC-200'6, in which the recording current value was adjusted, and video S/N and dropout were measured. Dropout had a magnitude of 5 μs or more and was expressed as an average value over 1 minute.
下表はその結果である。The table below shows the results.
上表から明らかなように、実施例１ないし３で得られた
磁気テープは、比較例１ないし３で得られた磁気テープ
に比し、電気抵抗が小さく、ビデオＳ／Ｎが高くて、ド
ロップアウトが少なく、このことからこの発明によって
得られる磁気記録媒体は電気抵抗が小さくて電磁変換特
性に優れていることがわかる。As is clear from the above table, the magnetic tapes obtained in Examples 1 to 3 have lower electrical resistance, higher video S/N, and lower drop resistance than the magnetic tapes obtained in Comparative Examples 1 to 3. This shows that the magnetic recording medium obtained by the present invention has low electrical resistance and excellent electromagnetic conversion characteristics.
第１図はイオン注入装置の概略断面図である。 特許出願人 日立マクセル株式会社 第１図 FIG. 1 is a schematic cross-sectional view of an ion implantation device. Patent applicant: Hitachi Maxell, Ltd. Figure 1
Claims (1)
を特徴とする磁気記録媒体 ２、基体上に結合剤樹脂を含む磁性層を形成した後、磁
性層の表面に真空雰囲気下でイオンを注入し、磁性層の
表面を炭化して、炭化層を有する磁性層を形成すること
を特徴とする磁気記録媒体の製造方法 ３、結合剤樹脂を含む磁性層に注入するイオンがＡｒ＾
＋、Ｎ＿２＾＋、Ｔｉ＾＋、Ｓｉ＾＋から選ばれるイオ
ンである特許請求の範囲第２項記載の磁気記録媒体の製
造方法[Claims] 1. A magnetic recording medium characterized in that a magnetic layer having a carbonized layer on the surface is provided on a substrate 2. After forming a magnetic layer containing a binder resin on the substrate, the magnetic layer is Method 3 for manufacturing a magnetic recording medium, characterized by implanting ions into the surface in a vacuum atmosphere and carbonizing the surface of the magnetic layer to form a magnetic layer having a carbonized layer, a magnetic layer containing a binder resin. The ions to be implanted are Ar^
The method for manufacturing a magnetic recording medium according to claim 2, wherein the ions are selected from +, N_2^+, Ti^+, and Si^+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP267987A JPS63171421A (en) | 1987-01-09 | 1987-01-09 | Magnetic recording medium and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP267987A JPS63171421A (en) | 1987-01-09 | 1987-01-09 | Magnetic recording medium and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63171421A true JPS63171421A (en) | 1988-07-15 |
Family
ID=11535989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP267987A Pending JPS63171421A (en) | 1987-01-09 | 1987-01-09 | Magnetic recording medium and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63171421A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130163117A1 (en) * | 2010-09-07 | 2013-06-27 | National University Of Singapore | Surface Treatment Method to Develope a Durable Wear Resistant Overcoat for Magnetic Recording Systems |
-
1987
- 1987-01-09 JP JP267987A patent/JPS63171421A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130163117A1 (en) * | 2010-09-07 | 2013-06-27 | National University Of Singapore | Surface Treatment Method to Develope a Durable Wear Resistant Overcoat for Magnetic Recording Systems |
| US8947826B2 (en) * | 2010-09-07 | 2015-02-03 | National University Of Singapore | Surface treatment method to develop a durable wear resistant overcoat for magnetic recording systems |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4619856A (en) | Magnetic recording medium | |
| US4354909A (en) | Process for production of magnetic recording medium | |
| US4780354A (en) | Magnetic recording medium | |
| GB2148149A (en) | Magnetic recording medium | |
| US4943479A (en) | Magnetic recording medium | |
| US4781965A (en) | Magnetic recording medium | |
| US4699847A (en) | Magnetic recording medium | |
| JPS63171421A (en) | Magnetic recording medium and its production | |
| JPH0762892B2 (en) | Magnetic recording medium for image recording | |
| JPS61211823A (en) | Magnetic recording medium and its production | |
| US4621027A (en) | Magnetic recording medium | |
| JPH0715751B2 (en) | Method of manufacturing magnetic recording medium | |
| JPH0673172B2 (en) | Magnetic recording medium | |
| DE3418907A1 (en) | Magnetic recording material | |
| JPS58164021A (en) | Magnetic recording medium | |
| JP2519962B2 (en) | Magnetic recording media | |
| US20060222907A1 (en) | Magnetic recording medium having an atmospheric plasma modified substrate | |
| JPS61211820A (en) | Magnetic recording medium | |
| JP2762273B2 (en) | Magnetic recording media | |
| JPS60205820A (en) | Magnetic recording medium and its production | |
| JPH0845055A (en) | Magnetic recording medium | |
| JPS61134923A (en) | Magnetic recording medium | |
| JPH01187903A (en) | Metal magnetic powder and magnetic recording medium | |
| JPH0226294B2 (en) | ||
| JPH061540B2 (en) | Magnetic recording medium |