JPH0321964B2 - - Google Patents
Info
- Publication number
- JPH0321964B2 JPH0321964B2 JP56035283A JP3528381A JPH0321964B2 JP H0321964 B2 JPH0321964 B2 JP H0321964B2 JP 56035283 A JP56035283 A JP 56035283A JP 3528381 A JP3528381 A JP 3528381A JP H0321964 B2 JPH0321964 B2 JP H0321964B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- recording medium
- layer
- underlayer
- thin film
- 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
- 230000005291 magnetic effect Effects 0.000 claims description 27
- 239000010409 thin film Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000002952 polymeric resin Substances 0.000 claims description 7
- 229920003002 synthetic resin Polymers 0.000 claims description 7
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000012808 vapor phase Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 14
- 239000010408 film Substances 0.000 description 7
- 238000003490 calendering Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- ZGDWHDKHJKZZIQ-UHFFFAOYSA-N cobalt nickel Chemical compound [Co].[Ni].[Ni].[Ni] ZGDWHDKHJKZZIQ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000001771 vacuum 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
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
本発明は磁気記録媒体とその製造方法に関す
る。
磁気記録媒体の発達はめざましく、完成の域に
達した塗布型の磁気テープや磁気デイスクの次代
を担う媒体として、強磁性薄膜を応用することが
近年盛んに研究されている。このうち、ポリエチ
レンテレフタレートやポリイミドなどの高分子の
可撓性基材を用いた媒体の研究は、蒸着膜やスパ
ツタリング膜の磁性層を中心に広く行なわれてい
る。このような薄膜磁性層を利用した媒体につい
ては、その磁性層の研究とは別に、基材と磁性層
の間の接着力や媒体としての柔軟性を得るための
下地層の研究を盛んに行なわれてきた。しかしな
がら、従来試みられてきた下地層は、主として無
機物の薄膜から成るものであるが、この下地層
は、その性質が必ずしも満足できるレベルに到つ
ていなかつた。
本発明者等は、この下地層の改良を図るべく、
高分子樹脂のオリゴマーを電子線によつて重合反
応を起こさせたものを検討した結果、接着性、柔
軟性に富んだ薄膜用の下地層が得られることが分
り、本発明に到つた。
図面は、本発明により製造された磁気記録媒体
を断面図で示すもので、磁気記録媒体１は、可撓
性のプラスチツクフイルムより成る基材２上に、
該基材と異なる種類の高分子樹脂層から成る下地
層３を形成し、この上に強磁性金属薄膜４を形成
することにより作られる。下地３は、基材上に高
分子樹脂のオリゴマーを塗布し、これに電子線、
レーザ線、紫外線およびその他の放射線等のエネ
ルギ線を照射して重合反応を起こさせることによ
り樹脂を硬化させることによつて得られ、強磁性
金属薄膜４は、真空蒸着法、イオンプレーテイン
グ法、CVD法、スパッタリング法、その他の適
当な薄膜形成技術により形成される。下地層３
は、例えば約500A、強磁性層４は例えば約
1000Aとし得る。このような構造の磁気記録媒体
は、接着性、柔軟性に富み、特にヘツドタツチが
問題となるような短波長領域の電磁変換特性にお
いて優れた特徴が見出された。特に下地層の材料
が電子線硬化性２重結合を有するアクリル系オリ
ゴマーの場合には、電子線を使用して迅速な硬化
処理が可能であり、更にカレンダー加工による圧
縮処理で表面性をあげ、その上に気相形成される
金属又は合金磁性薄膜層の電磁特性を改善するこ
とが出来る接着性、と柔軟性のほか平滑性を付与
するのに最適である。以下実施例によつて本発明
の効果を詳細に詳述する。
実施例 １
15μｍ厚で表面粗さ0.1μｍのポリエチレンテレ
フタレート製長尺フイルムを用意し、これにグラ
ビアシリンダを用いてアクリル系オリゴマーであ
る東亜合成製アロニツクスM8060とメチルエチル
ケトンとトルエンの混合溶液を塗布した。これを
乾燥した後電子線を照射して重合反応を起こさせ
た。全電子照射量は3Mradで、窒素雰囲気中で
照射を行なつた。このようにして下地層を形成し
た後、その上に５×10-5Torr（6.5×10-3Pa）の
圧力で、真空蒸着法によりコバルト−ニツケルの
合金（重量比で80対20）から成る強磁性層を形成
した。蒸着レートは200A／Ｓとし、入射角60゜の
斜め蒸着を行なつた。断面を観察したところ、下
地層の厚さは約500A（0.05μｍ）、強磁性層の厚さ
は約1000A（0.1μｍ）であつた。このサンプルを
A1とする。
下地層を形成した基材料を、カレンダ加工によ
つて圧縮成形処理した。カレンダ加工の条件は、
温度80℃、加圧の線圧130Kg／cmとした。これに
上記と同じ方法で強磁性層を設けた。このサンプ
ルをA2とする。
比較例
実施例１と同じ基材フイルムを用い、これに下
地層としてアルミニウム薄膜を真空蒸着法により
約500Aの厚さに設けた。このときの圧力は５×
10-5Torr（6.5×10-3Pa）、入射角は0゜とした。次
いで、この下地層上に、実施例１と同じ条件でコ
バルト−ニツケルの強磁性層を約1000Aの厚さで
設けた。このサンプルをＢとする。
これらの例によつて得られたサンプルA1、
A2、Ｂの主な特性を下表に示す。
The present invention relates to a magnetic recording medium and a method for manufacturing the same. The development of magnetic recording media has been remarkable, and in recent years there has been active research into the application of ferromagnetic thin films as a medium for the next generation of coated magnetic tapes and magnetic disks, which have reached the stage of completion. Among these, research on media using flexible substrates made of polymers such as polyethylene terephthalate and polyimide has been widely conducted, focusing on magnetic layers of vapor deposited films and sputtered films. Regarding media using such thin film magnetic layers, in addition to research on the magnetic layer, research is being actively conducted on the underlayer to obtain adhesive strength between the base material and the magnetic layer and flexibility as a medium. It's been coming. However, although the underlayers that have been attempted in the past are mainly composed of thin films of inorganic materials, the properties of these underlayers have not necessarily reached a satisfactory level. In order to improve this base layer, the present inventors,
As a result of studying polymer resin oligomers subjected to a polymerization reaction using electron beams, it was found that a base layer for thin films with excellent adhesiveness and flexibility could be obtained, leading to the present invention. The drawing shows a cross-sectional view of a magnetic recording medium manufactured according to the present invention.
It is produced by forming a base layer 3 made of a polymer resin layer of a different type from the base material, and then forming a ferromagnetic metal thin film 4 thereon. Underlayer 3 is a polymer resin oligomer coated on the base material, which is then exposed to an electron beam,
The ferromagnetic metal thin film 4 is obtained by curing the resin by irradiating energy beams such as laser beams, ultraviolet rays, and other radiation to cause a polymerization reaction. It is formed by CVD, sputtering, or other suitable thin film formation techniques. Base layer 3
is, for example, about 500A, and the ferromagnetic layer 4 is, for example, about 500A.
Can be 1000A. It has been discovered that a magnetic recording medium having such a structure has excellent adhesion and flexibility, and particularly excellent electromagnetic conversion characteristics in a short wavelength region where head touch is a problem. In particular, when the material of the base layer is an acrylic oligomer having electron beam-curable double bonds, rapid curing treatment is possible using electron beams, and further surface properties can be improved by compression treatment using calendering. It is ideal for imparting smoothness as well as adhesion and flexibility that can improve the electromagnetic properties of the metal or alloy magnetic thin film layer formed on it in a vapor phase. The effects of the present invention will be explained in detail below with reference to Examples. Example 1 A long film made of polyethylene terephthalate with a thickness of 15 μm and a surface roughness of 0.1 μm was prepared, and a mixed solution of acrylic oligomer Aronix M8060 manufactured by Toagosei Co., Ltd., methyl ethyl ketone, and toluene was applied to the film using a gravure cylinder. After drying this, it was irradiated with an electron beam to cause a polymerization reaction. The total electron irradiation dose was 3 Mrad, and irradiation was performed in a nitrogen atmosphere. After forming the base layer in this way, a cobalt-nickel alloy (80:20 by weight) is deposited on top of it by vacuum evaporation at a pressure of 5 x 10 -5 Torr (6.5 x 10 -3 Pa). A ferromagnetic layer was formed. The deposition rate was 200 A/S, and oblique deposition was performed at an incident angle of 60°. When the cross section was observed, the thickness of the underlayer was about 500 A (0.05 μm), and the thickness of the ferromagnetic layer was about 1000 A (0.1 μm). This sample
Let's call it A1. The base material on which the underlayer was formed was compression molded by calendering. The conditions for calendering are:
The temperature was 80°C and the linear pressure was 130 kg/cm. A ferromagnetic layer was provided on this using the same method as above. Let's call this sample A2. Comparative Example The same base film as in Example 1 was used, and a thin aluminum film having a thickness of about 500 A was provided thereon as an underlayer by vacuum evaporation. The pressure at this time is 5×
The temperature was 10 -5 Torr (6.5×10 -3 Pa) and the angle of incidence was 0°. Next, a cobalt-nickel ferromagnetic layer with a thickness of about 1000 Å was provided on this underlayer under the same conditions as in Example 1. This sample is called B. Sample A1 obtained by these examples,
The main characteristics of A2 and B are shown in the table below.
【表】
この表において、保磁力（Hc）は３つとも
ほゞ同じ値を示しているが、これは磁性層の形成
条件が一定に保たれているためである。一方、接
着強度は、硬度の異なる鉛筆に一定の荷重をかけ
てこすり試験を行なつたときの傷のつき始めた硬
度を示している。サンプルA1、A2が5Hと良好
なのに対し、比較例のＢは3Hと余りよくない。
3Hの値は従来レベルであり、A1とA2はこれよ
りかなり良好であることが認められた。
また、この表のビデオ感度は、5MH2での値を
TDK製アビリンビデオテープＴ−120を同じ条件
で使用した場合の値と比較して示した。サンプル
Ｂの−10.0dBに対し、本発明の実施例で得られ
た２つのテープは、それぞれ−4.0dB、−3.0dBと
改善された値を示している。特にサンプルA2は、
カレンダ加工の効果が1dBの差となつて現われて
いる。
上の実施例で得られた本発明の効果は、取りも
直さず高分子樹脂の下地層の存在によりもたらさ
れたものである。したがつて、強磁性層は、上述
の実施例では真空蒸着法により形成されている
が、前述のように、イオンプレーテイング法、
CVD法、スパツタリング法などの種々の薄膜形
成技術によつて作ることができる。また、強磁性
層は、必要に応じて、多層化したり、保護膜を付
加したりすることも自由である。
以上詳述したように、本発明によれば、強磁性
薄膜を有する磁気記録媒体において、強磁性層の
下地層として、基板と異なる種類の高分子樹脂層
を設けることにより、接着性、柔軟性に富み、電
磁変換特性に優れた高性能な磁気記録媒体を提供
できるので、本発明は、ビデオ磁気記録装置用の
磁気記録媒体をはじめ各種の磁気記録媒体に使用
してその効果はすこぶる大きい。[Table] In this table, all three coercive forces (Hc) show approximately the same value, and this is because the conditions for forming the magnetic layer are kept constant. On the other hand, adhesive strength indicates the hardness at which scratches begin to occur when pencils of different hardness are subjected to a rubbing test by applying a constant load. Samples A1 and A2 had a good value of 5H, whereas comparative example B had a poor value of 3H.
It was observed that the value of 3H was at the conventional level, and that A1 and A2 were considerably better than this. Also, the video sensitivity in this table is the value at 5MH 2 .
The values are compared with those obtained when TDK's Abirin Videotape T-120 is used under the same conditions. Compared to -10.0 dB for sample B, the two tapes obtained in the embodiment of the present invention show improved values of -4.0 dB and -3.0 dB, respectively. Especially for sample A2,
The effect of calendering appears as a 1dB difference. The effects of the present invention obtained in the above examples were brought about by the presence of the polymer resin underlayer. Therefore, although the ferromagnetic layer is formed by the vacuum evaporation method in the above embodiment, as described above, the ferromagnetic layer is formed by the ion plating method,
It can be made by various thin film forming techniques such as CVD method and sputtering method. Furthermore, the ferromagnetic layer may be multilayered or may be provided with a protective film, if necessary. As detailed above, according to the present invention, in a magnetic recording medium having a ferromagnetic thin film, by providing a polymer resin layer of a different type than the substrate as the underlayer of the ferromagnetic layer, adhesiveness and flexibility can be improved. Since it is possible to provide a high-performance magnetic recording medium that is rich in electromagnetic characteristics and has excellent electromagnetic conversion characteristics, the present invention can be used for various magnetic recording media including magnetic recording media for video magnetic recording devices, and its effects are extremely large.
図面は本発明の磁気記録媒体の概略断面図であ
る。
１：磁気記録媒体、２：基材、３：下地層、
４：強磁性層。
The drawing is a schematic cross-sectional view of the magnetic recording medium of the present invention. 1: Magnetic recording medium, 2: Base material, 3: Underlayer,
4: Ferromagnetic layer.
Claims (1)
てなる磁気記録媒体において、該磁性薄膜と前記
高分子基材との間に、該高分子基材とは異なる種
類の高分子樹脂層よりなり且つ圧縮された下地層
を設けたことを特徴とする磁気記録媒体。 ２ 高分子樹脂層がエネルギー線によつて硬化さ
れた層からなる前記第１項記載の磁気記録媒体。 ３ 高分子基材上へ電子線硬化性のアクリル系オ
リゴマーの層を塗布し、電子線をこの層に照射し
て硬化した下地層を形成し、ついでこの下地層を
有する高分子基材をカレンダー処理にかけて圧縮
し、その上に気相法により磁性薄膜を設けること
を特徴とする磁気記録媒体の製造方法。[Scope of Claims] 1. In a magnetic recording medium in which a magnetic thin film is provided on a polymer base material by a vapor phase method, between the magnetic thin film and the polymer base material, there is a magnetic recording medium that is different from the polymer base material. 1. A magnetic recording medium comprising a compressed underlayer made of a polymer resin layer of various types. 2. The magnetic recording medium according to item 1 above, wherein the polymer resin layer is a layer cured by energy rays. 3. Apply a layer of electron beam-curable acrylic oligomer onto a polymeric substrate, irradiate this layer with an electron beam to form a hardened underlayer, and then calender the polymeric substrate with this underlayer. 1. A method for manufacturing a magnetic recording medium, which comprises compressing the medium through processing, and then providing a magnetic thin film thereon by a vapor phase method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56035283A JPS57150126A (en) | 1981-03-13 | 1981-03-13 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56035283A JPS57150126A (en) | 1981-03-13 | 1981-03-13 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57150126A JPS57150126A (en) | 1982-09-16 |
| JPH0321964B2 true JPH0321964B2 (en) | 1991-03-25 |
Family
ID=12437444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56035283A Granted JPS57150126A (en) | 1981-03-13 | 1981-03-13 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57150126A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5367786A (en) * | 1976-11-29 | 1978-06-16 | Matsushita Electric Ind Co Ltd | Smoothed films |
| JPS5379503A (en) * | 1976-12-23 | 1978-07-14 | Ulvac Corp | Magnetic recording material |
| JPS5597027A (en) * | 1979-01-11 | 1980-07-23 | Minnesota Mining & Mfg | Magnetic recording tape having epoxy substrate coating with polyester film back lining |
-
1981
- 1981-03-13 JP JP56035283A patent/JPS57150126A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5367786A (en) * | 1976-11-29 | 1978-06-16 | Matsushita Electric Ind Co Ltd | Smoothed films |
| JPS5379503A (en) * | 1976-12-23 | 1978-07-14 | Ulvac Corp | Magnetic recording material |
| JPS5597027A (en) * | 1979-01-11 | 1980-07-23 | Minnesota Mining & Mfg | Magnetic recording tape having epoxy substrate coating with polyester film back lining |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57150126A (en) | 1982-09-16 |
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