JPS5972648A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5972648A JPS5972648A JP57184046A JP18404682A JPS5972648A JP S5972648 A JPS5972648 A JP S5972648A JP 57184046 A JP57184046 A JP 57184046A JP 18404682 A JP18404682 A JP 18404682A JP S5972648 A JPS5972648 A JP S5972648A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- layer
- recording medium
- film
- magnetic recording
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 66
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 16
- 229920000620 organic polymer Polymers 0.000 claims abstract description 10
- 239000006247 magnetic powder Substances 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000010409 thin film Substances 0.000 claims description 14
- 239000010408 film Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 5
- 239000013256 coordination polymer Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract description 4
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 abstract description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 235000019441 ethanol Nutrition 0.000 abstract description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 abstract description 2
- 238000010030 laminating Methods 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000007738 vacuum evaporation Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical group CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004544 sputter deposition Methods 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
- G11B5/716—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 two or more magnetic layers
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、複数の磁性層を重層形成した磁気記録媒体に
関し、特に短波長記録にも長波長記録にも適した高性能
の磁気記録媒体に関するものである。Detailed Description of the Invention Field of the Invention The present invention relates to a magnetic recording medium in which a plurality of magnetic layers are stacked, and in particular to a high-performance magnetic recording medium suitable for both short wavelength recording and long wavelength recording. It is.
従来例の構成とその問題点
従来、磁気記録媒体の磁性層としてγ−Ｆｅ２Ｏ３゜Ｃ
ｏ吸吸着−Ｆｅ２ｏ３．Ｆｅ５ｏ４．ＣＯ吸着Ｆｅ５ｏ
４などの磁性体粉末とバインダーを支持体上に塗布乾燥
したものがある。しかしこの塗布型の磁気記録媒体は記
録波長が長波長の磁気記録に適している反面、短波長の
磁気記録には最大残留磁束密度などの磁気特性が不充分
であった。そのため近年高密度磁気記録に適する磁気特
性を持った磁気記録媒体が開発された来た。Conventional structure and its problems Conventionally, γ-Fe2O3°C was used as the magnetic layer of a magnetic recording medium.
o Adsorption-Fe2o3. Fe5o4. CO adsorption Fe5o
There is one in which magnetic powder such as No. 4 and a binder are coated on a support and dried. However, while this coated magnetic recording medium is suitable for magnetic recording with long recording wavelengths, its magnetic properties such as maximum residual magnetic flux density are insufficient for magnetic recording with short wavelengths. Therefore, in recent years, magnetic recording media with magnetic properties suitable for high-density magnetic recording have been developed.
その一つとして、ＦｅやＣＯなとの強磁性金属を支持体
上に真空蒸着、イオンブレーティング、スパッタリング
、メッキなどの方法により薄膜状に形成したものがある
。これはその強磁性金属薄膜の厚みが数１０００人であ
ることから、特に短波長記録に適している反面、長波長
記録に対しては信号出力の低下、Ｓ／Ｎ比の低下などが
発生するため長波長から短波長まで均一な出力信号が要
求されるオーディオテープには不適当であった。One example is one in which a ferromagnetic metal such as Fe or CO is formed into a thin film on a support by a method such as vacuum evaporation, ion blasting, sputtering, or plating. Since the thickness of the ferromagnetic metal thin film is several thousand, it is particularly suitable for short wavelength recording, but on the other hand, for long wavelength recording, a decrease in signal output and a decrease in the S/N ratio occur. Therefore, it was unsuitable for audio tapes, which require a uniform output signal from long wavelengths to short wavelengths.
このようなそれぞれの磁気記録媒体の欠点を解決するた
めに第１図に示すように支持体１の表面にイ代抗磁力で
低最大残留磁束密度なる塗布磁性層２を設け、その上に
高抗磁力で最大残留磁束密度の高い強磁性金属薄膜層３
を設けた磁気記録媒体が提案されている。In order to solve these drawbacks of each magnetic recording medium, as shown in FIG. Ferromagnetic metal thin film layer 3 with coercive force and high maximum residual magnetic flux density
A magnetic recording medium has been proposed.
しかしながら、本発明者がこの磁気記録媒体を製造しよ
うとしたところ、種々の問題点があることが判明した。However, when the present inventor attempted to manufacture this magnetic recording medium, it was found that there were various problems.
すなわち、
（１）磁性層２の表面はたとえカレンダー処理がなされ
ていてもかなりの凹凸があり、そ上に真空蒸着などによ
って強磁性金属薄膜層３を設けてもその表面の凹凸は改
善されることがなく、このような磁気記録媒体にて記録
、再生を行なった場合短波長領域の出力が低下し、強磁
性金属薄膜のもつ特徴が失なわれてしまう。That is, (1) The surface of the magnetic layer 2 is quite uneven even if it is calendered, and even if the ferromagnetic metal thin film layer 3 is provided thereon by vacuum evaporation or the like, the surface unevenness will not be improved. Therefore, when recording and reproducing on such a magnetic recording medium, the output in the short wavelength region decreases, and the characteristics of the ferromagnetic metal thin film are lost.
（２）磁性層２の表面に強磁性金属薄膜層３を真空蒸着
によって設けようとした場合、磁性層２中の添加剤が揮
散し、真空度を低下させたり、さらにその揮散成分によ
って磁性層２と強磁性金属薄膜層３との付着力が著しく
低下したり、光沢が悪く表面性の悪いものになってしま
う。(2) When attempting to provide the ferromagnetic metal thin film layer 3 on the surface of the magnetic layer 2 by vacuum deposition, additives in the magnetic layer 2 will volatilize, lowering the degree of vacuum, and furthermore, the volatilized components may cause the magnetic layer to The adhesion force between the ferromagnetic metal thin film layer 3 and the ferromagnetic metal thin film layer 3 is significantly reduced, and the gloss and surface properties are poor.
発明の目的
本発明は、上述した種々の問題点を解消し、かつ長波長
記録および短波長記録のいづれにも適した磁気記録媒体
を提供するものである。OBJECTS OF THE INVENTION The present invention solves the various problems mentioned above and provides a magnetic recording medium suitable for both long wavelength recording and short wavelength recording.
発明の構成
本発明は支持体上に磁性粉をバインダーとともに塗布乾
燥して得られた第１の磁性層の表面に、その組成成分が
第１の磁性層を溶解することがなく、かつ塗布乾燥後に
非磁性有機高分子膜の中間層を形成する成分を含有し、
その含有量が０．１〜１０係で粘度が１〜２００ＣＰで
ある塗布液を塗布乾燥して表面が平滑で真空蒸着時に揮
発成分の揮散を抑える非磁性有機高分子膜の中間層を形
成し、さらにその表面に強磁性金属薄膜層を形成した磁
気記録媒体である。Structure of the Invention The present invention provides a method for coating the surface of a first magnetic layer obtained by coating and drying a magnetic powder together with a binder on a support, such that the composition components do not dissolve the first magnetic layer and the coating and drying process is performed. Contains components that will later form the intermediate layer of the nonmagnetic organic polymer film,
A coating liquid with a content of 0.1 to 10 CP and a viscosity of 1 to 200 CP is applied and dried to form an intermediate layer of a non-magnetic organic polymer film with a smooth surface and suppressing volatilization of volatile components during vacuum deposition. This is a magnetic recording medium that further has a ferromagnetic metal thin film layer formed on its surface.
実施例の説明
本発明において、支持体はガラス、プラスチック、金属
などのシート状のものが用いられる。DESCRIPTION OF EMBODIMENTS In the present invention, a sheet-like support made of glass, plastic, metal, etc. is used.
捷た第１の磁性層は磁性粉として、γ−Ｆｅ２Ｏ３゜Ｃ
Ｏ吸吸着−Ｆｅ２０３．Ｆｅ３Ｏ４などが用いられバイ
ンダー成分としては塩化ビニル−酢酸ビニル共重合体、
ウレタン樹脂、７′エノキシ樹脂あるいはこれらの混合
物などが用いられる。また中間層の非磁性有機高分子膜
を形成する成分としてはポリビニルブチラール、フェノ
キシ樹脂、塩化ビニル−酢酸ビニル共重合体、エポキシ
樹脂、ウレタン樹脂、ポリビニルアルコールなどが用い
られ、そしてこれらの樹脂を適当な有機溶剤に溶解し、
かつ希訳して塗布する。ここで重要なことは塗布液の成
分（樹脂、溶剤）が第１の磁性層を溶解することのない
成分であることで、磁性層が塗布液によって溶解してし
まうとそのへ表面が凸凹になったシ、磁性層の配向状態
が悪くなるなど磁気記録媒体としては好ましくないもの
となるからである。The shredded first magnetic layer is made of γ-Fe2O3°C as magnetic powder.
O adsorption-Fe203. Fe3O4 etc. are used, and the binder component is vinyl chloride-vinyl acetate copolymer,
Urethane resin, 7' enoxy resin, or a mixture thereof can be used. In addition, polyvinyl butyral, phenoxy resin, vinyl chloride-vinyl acetate copolymer, epoxy resin, urethane resin, polyvinyl alcohol, etc. are used as components for forming the non-magnetic organic polymer film of the intermediate layer. Dissolved in organic solvent,
Katsuki translates and applies. What is important here is that the components of the coating solution (resin, solvent) do not dissolve the first magnetic layer; if the magnetic layer is dissolved by the coating solution, the surface will become uneven. This is because if this happens, the orientation of the magnetic layer deteriorates, making it undesirable as a magnetic recording medium.
さらに塗布液中の非磁性有機高分子膜を形成する成分の
濃度、塗布液の粘度は前述の条件が必要であり、そして
塗布はローラ面１ ｍ”当り２ｃｔＡ〜１ｏ○ｃｒｔｌ
であるグラビアセルを有するロールによって行なわれる
。これは塗布液の粘度が高過ぎたり、塗布量が少な過ぎ
ると塗布後の平滑化工程におけるスムーザ−がかけられ
なくなり、反対に粘度が低過ぎたり、塗布量が多過ぎる
と乾燥時の熱風などによって液だれか生じたりすること
と、有機高分子膜の厚みはスペーシングロスを考慮すれ
ばなるべく薄い方が良いがその反面薄くなり過ぎると表
面が平滑にならず、真空蒸着時においては揮発成分の揮
散を抑えることが出来なくなってしまうからである。Furthermore, the concentration of the component forming the non-magnetic organic polymer film in the coating solution and the viscosity of the coating solution must meet the conditions described above, and the coating should be carried out at a rate of 2 ctA to 1 ocrtl per 1 m of roller surface.
It is carried out by a roll having a gravure cell. This is because if the viscosity of the coating liquid is too high or the amount applied is too small, the smoother cannot be applied in the smoothing process after application, and on the other hand, if the viscosity is too low or the amount applied is too large, hot air may be generated during drying. It is better to keep the thickness of the organic polymer film as thin as possible in consideration of spacing loss, but on the other hand, if it is too thin, the surface will not be smooth and volatile components will be removed during vacuum evaporation. This is because it becomes impossible to suppress the volatilization of.
一方、強磁性金属薄膜層の成分としては、Ｆｅ。On the other hand, the component of the ferromagnetic metal thin film layer is Fe.
Ｃｏ 、 Ｎ ｉあるいはそれらの合金などが用いられ
真空蒸着、イオンブレーティング、スノ々ツタリング、
メッキなどの方法により形成される。Co, Ni or their alloys are used, and vacuum evaporation, ion blating, snottering,
It is formed by a method such as plating.
このように本発明ｉ支持体上に磁性粉ヲ・＜イングーと
ともに塗布乾燥して得られた第１の磁性層の表面に、表
面が平滑でスペーシングロスの影響のない厚みであり、
かつ真空蒸着時などに第１の磁性層からの揮発成分の揮
散を抑える非磁性有機高分子膜の中間層を設け、さらに
その表面に強磁性金属薄膜を形成した短波長記°録にも
長波長記録にも適した磁気記録媒体である。The surface of the first magnetic layer obtained by coating and drying the magnetic powder together with the magnetic powder on the support of the present invention i as described above has a smooth surface and a thickness that is not affected by spacing loss.
In addition, an intermediate layer of a non-magnetic organic polymer film is provided to suppress the volatilization of volatile components from the first magnetic layer during vacuum evaporation, and a ferromagnetic metal thin film is formed on the surface of the intermediate layer. It is a magnetic recording medium suitable for wavelength recording.
以下具体例を比較例とともに説明する。Specific examples will be explained below along with comparative examples.
第１の磁性層として下記組成のものを調整し、厚さ８μ
のポリエステルフィルムからなる支持体上に乾燥厚さ５
μとなるように形成した。なお単位は全て重量部である
。The first magnetic layer was prepared with the following composition and had a thickness of 8 μm.
on a support consisting of a polyester film with a dry thickness of 5
It was formed so that it was μ. All units are parts by weight.
ＣＯ吸着γＦ ｅ ２０３ １００部塩
化ビニル−酢酸ビニル共重合体 ３０部ジブチ
ルフタレート ２部レシチン
２部トノヒエン
１００部シクロへキサノン
１５０部また、非磁性有機高分子膜である中
間層を形成する塗布液として下記組成のものを調整した
。CO adsorption γF e 203 100 parts Vinyl chloride-vinyl acetate copolymer 30 parts Dibutyl phthalate 2 parts Lecithin
Part 2 Tonohien
100 parts cyclohexanone
150 parts A coating solution having the following composition was also prepared as a coating solution for forming an intermediate layer which is a non-magnetic organic polymer film.
ポリビニルブチラール ２部エチルア
ルコール １００部上記組成の塗布液を
第３図に示す塗布方法により乾燥厚さ０．２μとなるよ
うに塗布した。Polyvinyl butyral 2 parts Ethyl alcohol 100 parts A coating solution having the above composition was coated to a dry thickness of 0.2 .mu.m by the coating method shown in FIG.
第３図において、６は１ｍ２当り４０ｃｒＩのグラビア
セルの容量を有するロール、６は硬度７ｏ０の弾性バッ
クアップロール〜７は液だめパン、８は塗布液、９は厚
さ６０μのポリエステルフィルム’ｅ用いたフレキシブ
ルスムーザ−１１はポリエステルフィルムである支持体
、２は第１の磁性層である。これらは矢印方向に搬送さ
れて第１の磁性層２の表面に塗布された中間層４はフレ
キシブルスムーザ−９を通ったのち乾燥される。In Fig. 3, 6 is a roll having a gravure cell capacity of 40 crI per m2, 6 is an elastic backup roll with a hardness of 7o0, 7 is a liquid reservoir pan, 8 is a coating liquid, and 9 is for a polyester film 'e with a thickness of 60μ. The flexible smoother 11 is a polyester film support, and 2 is a first magnetic layer. These are transported in the direction of the arrow, and the intermediate layer 4 coated on the surface of the first magnetic layer 2 passes through a flexible smoother 9 and is then dried.
次に中間層４０表面に真空蒸着によって第２図に示すよ
うにＣｏ −Ｎ ｉ合金を厚さ２０００八となるように
第２の磁性層３を形成した。Next, the second magnetic layer 3 was formed on the surface of the intermediate layer 40 by vacuum evaporation to have a thickness of 2,000 mm using a Co--Ni alloy as shown in FIG.
なお比較例として中間層だけを有せず他はこの実施例と
全て同一条件でポリエステルベースフィルム上に第１の
磁性層２と第２の磁性層３を形成したものを掲げる。上
記実施例および比較例として製造した磁気記録媒体につ
いて、第２の磁性層の付着強度９表面粗さ１表面光沢を
測定した。その結果付着強度においては３．８１Ｍ幅の
テープ状に切断し、これを一般に使用されているカセッ
トテープレコーダーにより数回繰り返し走行させた結果
、本発明によるものはほとんど傷がつかなかったが比較
例によるものは無数に傷がつき、ヘッドにも比較例によ
るものは第２の磁性層の成分であるＣ ｏ −Ｎ ｉの
微粉末が多量に付着していた。首た表面粗さにおいては
本発明によるものはＲａＯ・０２１であり、比較例によ
るものではＲａ ０．０３０であった。さらに表面光沢
においては本発明によるものは３４６％、比較例のもの
は３１０％であり１目視においても本発明によるものは
金属光沢を有しているが、比較例によるものは光沢の悪
い炎色がかったものであった。As a comparative example, the first magnetic layer 2 and the second magnetic layer 3 were formed on a polyester base film under the same conditions as in this example except that the intermediate layer was not included. The adhesion strength, surface roughness, and surface gloss of the second magnetic layer were measured for the magnetic recording media manufactured as Examples and Comparative Examples. As a result, in terms of adhesion strength, the tape was cut into a 3.81M wide tape and was repeatedly run several times on a commonly used cassette tape recorder. The head according to the comparative example had numerous scratches, and the head according to the comparative example had a large amount of fine powder of Co--Ni, which is a component of the second magnetic layer, adhering to the head. Regarding the surface roughness, the one according to the present invention had an RaO of 0.021, and the one according to the comparative example had an RaO of 0.030. Furthermore, the surface gloss of the product according to the present invention is 346% and that of the comparative example is 310%, and even when visually inspected, the product according to the present invention has a metallic luster, but the product according to the comparative example has a flame color with poor gloss. It was tinged.
発明の効果
以上のように本発明は磁性層とその上に形成される強磁
性金属薄膜との間に非磁性有機高分子膜からなる中間層
を設は友ことにより、表面性が良好で強磁性金属薄膜層
の付着強度の優れた短波長記録にも長波長記録にも適し
た磁気記録媒体が得られたものであり、その効果は犬で
ある。Effects of the Invention As described above, the present invention provides an intermediate layer made of a non-magnetic organic polymer film between a magnetic layer and a ferromagnetic metal thin film formed thereon, thereby providing a strong surface with good surface properties. A magnetic recording medium suitable for both short wavelength recording and long wavelength recording with excellent adhesion strength of the magnetic metal thin film layer has been obtained, and its effects are outstanding.
第１図は従来の磁気記録媒体の構成図、第２図は本発明
の一実施例を示す磁気記録媒体の構成図、第゛ｊ図は中
間層の塗布工程を示す図である。
１・・・・・・支持体、２・・・・・・第１の磁性層、
３・・・・・・第２の磁性層、４・・・・・・中間層。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第３図FIG. 1 is a block diagram of a conventional magnetic recording medium, FIG. 2 is a block diagram of a magnetic recording medium showing an embodiment of the present invention, and FIG. 1...Support, 2...First magnetic layer,
3...Second magnetic layer, 4...Intermediate layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3
Claims (2)
して得られた第１の磁性層の表面に非磁性有機高分子膜
からなる中間層を介して強磁性金属薄膜からなる第２の
磁性層を形成したことを特徴とする磁気記録媒体。(1) A second magnetic layer made of a ferromagnetic metal thin film is applied to the surface of the first magnetic layer obtained by coating and drying magnetic powder together with a binder on a support through an intermediate layer made of a non-magnetic organic polymer film. A magnetic recording medium characterized by forming a layer.
れ、かつその成分の濃度が０．１〜１ｏ％で、粘度が１
〜２００ＣＰである特許請求の範囲第１項記載の磁気記
録媒体。(2) The intermediate layer is composed of a component that does not dissolve the first magnetic layer, has a concentration of 0.1 to 10%, and has a viscosity of 1%.
The magnetic recording medium according to claim 1, wherein the magnetic recording medium has a particle size of 200 CP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57184046A JPS5972648A (en) | 1982-10-20 | 1982-10-20 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57184046A JPS5972648A (en) | 1982-10-20 | 1982-10-20 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5972648A true JPS5972648A (en) | 1984-04-24 |
Family
ID=16146413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57184046A Pending JPS5972648A (en) | 1982-10-20 | 1982-10-20 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5972648A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0723260A1 (en) * | 1995-01-19 | 1996-07-24 | Minnesota Mining And Manufacturing Company | Method for coating a magnetic recording medium |
-
1982
- 1982-10-20 JP JP57184046A patent/JPS5972648A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0723260A1 (en) * | 1995-01-19 | 1996-07-24 | Minnesota Mining And Manufacturing Company | Method for coating a magnetic recording medium |
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