JP3240672B2 - Magnetic recording media - Google Patents
Magnetic recording mediaInfo
- Publication number
- JP3240672B2 JP3240672B2 JP05507992A JP5507992A JP3240672B2 JP 3240672 B2 JP3240672 B2 JP 3240672B2 JP 05507992 A JP05507992 A JP 05507992A JP 5507992 A JP5507992 A JP 5507992A JP 3240672 B2 JP3240672 B2 JP 3240672B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- conversion characteristics
- thickness
- electromagnetic conversion
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁気テープ等の磁気記
録媒体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium such as a magnetic tape.
【０００２】[0002]
【従来の技術】近年ビデオテープの高画質化が盛んに実
施及び検討されている。８ミリビデオではＨｉ−８、Ｖ
ＨＳではＳ−ＶＨＳといった従来のシステムと比較して
輝度信号の記録波長をより短くしてシステムとして高画
質化に対応した商品の構成比が大きくなりつつある。2. Description of the Related Art In recent years, high quality video tapes have been actively implemented and studied. Hi-8, V for 8mm video
In the HS, as compared with the conventional system such as the S-VHS, the recording wavelength of the luminance signal is made shorter, and the composition ratio of the product corresponding to the high image quality as the system is increasing.
【０００３】一般に短波長領域における電磁変換特性の
向上に対しては、磁性粉の微細化、磁性層の薄膜化等が
有効な手段となる。しかし、これらの手法を単純に用い
た場合には短波長領域における電磁変換特性は向上する
ものの、走行耐久性が劣化してしまい実用上の問題とな
る。In general, to improve the electromagnetic conversion characteristics in a short wavelength region, miniaturization of a magnetic powder, thinning of a magnetic layer, and the like are effective means. However, when these methods are simply used, the electromagnetic conversion characteristics in the short wavelength region are improved, but the running durability is deteriorated, which is a practical problem.
【０００４】また、磁気記録媒体には、耐久性向上のた
め、一般的には酸化クロムやαアルミナなどの研磨剤が
添加されている。これら研磨剤の粒径は小さい方が電磁
変換特性に対して好ましいものの、従来の１．５〜３．
０μｍといった一般的な磁性層厚では粒径の小さい研磨
剤を用いた場合には、磁性層表面に有効に存在させるこ
とが出来ないため、電磁変換特性を犠牲にして添加量を
多くしないと十分な耐久性が得られないといった問題が
残されていた。A magnetic recording medium is generally added with a polishing agent such as chromium oxide or α-alumina in order to improve durability. Although the smaller the particle size of these abrasives, the better in terms of electromagnetic conversion characteristics, the conventional 1.5 to 3.
When an abrasive having a small particle size is used with a general magnetic layer thickness of 0 μm, the abrasive cannot be effectively present on the surface of the magnetic layer. However, there still remains a problem that high durability cannot be obtained.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、従来のこの
ような問題に鑑み提案されたもので、磁性層の厚さのみ
ならず、用いる研磨剤の比表面積、ｐＨについても所定
の値に規定することにより、短波長記録に対応すべく薄
塗りした場合でも良好な電磁変換特性が保たれた上、な
お且つ良好な耐久性を有する磁気記録媒体を提供するこ
とを目的にしている。SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned conventional problems. Not only the thickness of the magnetic layer but also the specific surface area and pH of the abrasive used are set to predetermined values. It is an object of the present invention to provide a magnetic recording medium that maintains good electromagnetic conversion characteristics even when it is thinly coated to cope with short-wavelength recording and has good durability.
【０００６】[0006]
【課題を解決するための手段】本発明は、上述の目的を
達成せんものと鋭意研究を重ねた結果、非磁性支持体上
に強磁性粉末と結合剤とを主体とする磁性層が形成され
てなる磁気記録媒体において、上記磁性層は厚みが０．
２〜０．６μｍであって、ＢＥＴ法による比表面積が１
２．１〜２２．９ｍ２／ｇであり、かつｐＨが７．０以
下のαアルミナを上記強磁性粉末１００重量部に対して
４〜１０重量部含有することにより、このような目的に
適合する磁気記録媒体を見いだし本発明を完成するに至
ったものである。According to the present invention, as a result of intensive research on achieving the above object, a magnetic layer mainly composed of a ferromagnetic powder and a binder is formed on a non-magnetic support. In the magnetic recording medium comprising:
2 to 0.6 μm, and the specific surface area by the BET method is 1
It is suitable for such purpose by containing α-alumina having a pH of 2.1 to 22.9 m 2 / g and a pH of 7.0 or less based on 100 parts by weight of the ferromagnetic powder. The present invention has been completed, and the present invention has been completed.
【０００７】上記磁性層の厚みを小さくすることは、厚
み方向の自己減磁が軽減され、短波長領域における電磁
変換特性が向上する。しかし、研磨剤等の非磁性顔料の
粒子径が走行耐久性に大きく影響してしまい、従来の磁
性層厚で用いた場合には良好な走行耐久特性を示したＢ
ＥＴ法による比表面積；１０ｍ2 ／ｇ以下のαアルミナ
では電磁変換特性がた大幅に低下してしまう。[0007] Reducing the thickness of the magnetic layer reduces self-demagnetization in the thickness direction and improves electromagnetic conversion characteristics in a short wavelength region. However, the particle size of the non-magnetic pigment such as an abrasive greatly affects the running durability, and when used with a conventional magnetic layer thickness, B exhibited good running durability characteristics.
In the case of α-alumina having a specific surface area of 10 m 2 / g or less by the ET method, the electromagnetic conversion characteristics are significantly reduced.
【０００８】そこで、０．６μｍ以下の厚さの磁性層に
関して良好な走行耐久性を得るために種々の検討を行っ
たところ、従来の厚さの磁性層に対しては耐久性に問題
のあったＢＥＴ法による比表面積；１０ｍ２／ｇ以上の
αアルミナ、特に比表面積が１２．１〜２２．９ｍ２／
ｇでありｐＨが７．０以下のαアルミナを、強磁性粉末
１００重量部に対して、４〜１０重量部用いることによ
り短波長における電磁変換特性が良好で、かつ、走行耐
久性にも優れた磁気記録媒体を得ることが出来た。Therefore, various studies were conducted to obtain good running durability with respect to a magnetic layer having a thickness of 0.6 μm or less. As a result, there was no problem in durability with respect to a magnetic layer having a conventional thickness. BET specific surface area was; 10 m 2 / g or more α-alumina, in particular a specific surface area 12.1~22.9m 2 /
g and a pH of 7.0 or less of α-alumina are used in an amount of 4 to 10 parts by weight with respect to 100 parts by weight of the ferromagnetic powder, so that the electromagnetic conversion characteristics at short wavelengths are good and the running durability is excellent. Magnetic recording medium was obtained.
【０００９】[0009]
【作用】このように、本発明では、磁性層は厚みが０．
２〜０．６μｍであって、ＢＥＴ法による比表面積が１
２．１〜２２．９ｍ２／ｇであるαアルミナ、特にｐＨ
が７．０以下のαアルミナを、強磁性粉末１００重量部
に対して、４〜１０重量部用いることにより短波長にお
ける電磁変換特性が良好で、かつ、走行耐久性にも優れ
た磁気記録媒体を得ることができた。As described above, according to the present invention, the magnetic layer has a thickness of 0.1 mm.
2 to 0.6 μm, and the specific surface area by the BET method is 1
Α-alumina which is 2.1 to 22.9 m 2 / g, especially pH
A magnetic recording medium having good electromagnetic conversion characteristics at short wavelengths and excellent running durability by using 4 to 10 parts by weight of α alumina having a value of 7.0 or less with respect to 100 parts by weight of the ferromagnetic powder. Could be obtained.
【００１０】上記磁性層の厚みについて、０．６μｍを
越えた場合には、自己減磁により短波長領域における電
磁変換特性が悪化する。また、研磨剤の粒径を大きくし
ないと良好な耐久性が得られない。αアルミナの比表面
積が１２．１〜２２．９ｍ２／ｇの範囲を外れると、
０．６μｍ以下の磁性層の厚みであっても、短波長領域
における良好な電磁変換特性が得られない。更に、ｐＨ
が７．０より大きいαアルミナでは、良好な分散状態が
得られず、大きな凝集体が存在し、良好な電磁変換特性
が得られないばかりでなく、磁性層の厚みが小さい場合
には、ヘッドの寿命をも短くしてしまう。When the thickness of the magnetic layer exceeds 0.6 μm, the electromagnetic conversion characteristics in the short wavelength region deteriorate due to self-demagnetization. Also, good durability cannot be obtained unless the particle size of the abrasive is increased. When the specific surface area of α-alumina is out of the range of 12.1 to 22.9 m 2 / g,
Even if the thickness of the magnetic layer is 0.6 μm or less, good electromagnetic conversion characteristics in a short wavelength region cannot be obtained. Furthermore, pH
Alumina is larger than 7.0, a good dispersion state cannot be obtained, large aggregates are present, good electromagnetic conversion characteristics cannot be obtained, and when the thickness of the magnetic layer is small, the head Also shortens the service life.
【００１１】αアルミナの添加量について、４重量部よ
り少ない場合には、十分な耐久性が得られず、１０重量
部より多い場合には、良好な電磁変換特性が得られない
ばかりでなく、ヘッドの寿命をも短くしてしまう。When the amount of α-alumina is less than 4 parts by weight, sufficient durability cannot be obtained, and when it is more than 10 parts by weight, not only good electromagnetic conversion characteristics cannot be obtained, but also The life of the head is also shortened.
【００１２】[0012]
【実施例】以下、本発明の具体的な実施例について説明
するが、本発明はこの実施例に限定されるものではない
ことはいうまでもない。 〔試料カセットテープの作成〕以下に示す組成からなる
メタル系磁性塗料をサンドミル分散した後、硬化剤（コ
ロネードＬ ５重量部）を添加し、ベースフィルム上に
塗布−乾燥−巻き取りした。その後高温、高圧条件下で
カレンダー処理→硬化処理→バックコート（０．６μ
ｍ）した後、８ミリ幅にスリットして得られたテープを
８ミリカセットに組み込んで１４種類の試料を得た。EXAMPLES Hereinafter, specific examples of the present invention will be described, but it goes without saying that the present invention is not limited to these examples. [Preparation of Sample Cassette Tape] A metal-based magnetic coating material having the following composition was dispersed in a sand mill, and then a curing agent (5 parts by weight of Coronade L) was added, and the resultant was coated, dried and wound on a base film. Then, under high temperature and high pressure conditions, calender treatment → curing treatment → back coat (0.6μ
m), and a tape obtained by slitting to an 8 mm width was assembled into an 8 mm cassette to obtain 14 types of samples.
【００１３】テープの全厚は１０．３〜１０．７μｍに
なるように用いたベースフィルムの厚みで調整した。用
いたベースフィルムは、ポリエチレンテレフタレートフ
ィルムである。研磨剤として検討に用いたαアルミナの
仕様、また得られた試料の仕様を表２に示す。メタル系
磁性塗料の組成は下記の表１に示す通りである。なお、
メタル磁性粉としては、ここではＦｅＡｌ合金磁性粉を
用いた。以上が本実施例における構成であるが、本願発
明の構成において、例えば強磁性粉末、結合剤、非磁性
支持体等については、従来公知の材料であれば任意の種
類の材料において実施可能であり、磁性層の構成も任意
である。The total thickness of the tape was adjusted by adjusting the thickness of the base film used so as to be 10.3 to 10.7 μm. The base film used is a polyethylene terephthalate film. Table 2 shows the specifications of α-alumina used in the study as the abrasive and the specifications of the obtained samples. The composition of the metal-based magnetic paint is as shown in Table 1 below. In addition,
Here, FeAl alloy magnetic powder was used as the metal magnetic powder. The above is the configuration in the present embodiment. In the configuration of the present invention, for example, the ferromagnetic powder, the binder, the non-magnetic support, and the like can be implemented with any type of conventionally known material. The configuration of the magnetic layer is also arbitrary.
【００１４】[0014]
【表１】 [Table 1]
【００１５】以上のようにして作成した８ミリビデオカ
セットテープの電磁変換特性及び耐久性について以下に
示す方法により評価を行った。The electromagnetic conversion characteristics and durability of the 8 mm video cassette tape prepared as described above were evaluated by the following methods.
【００１６】〔評価方法〕 電磁変換特性；Ｈｉ−８モードでの記録・再生可能な８
ミリビデオデッキを用いて２５℃、６０％ＲＨの環境下
でテープの１０分間の部分に７ＭＨｚの信号を入力し、
７ＭＨｚでの出力と、そこから−１ＭＨｚのノイズとの
差を求めて、走行前Ｃ／Ｎとした。実施例１で得られた
値を０ｄｂとして、この値との相対値を表２に示した。[Evaluation method] Electromagnetic conversion characteristics: 8 capable of recording / reproducing in Hi-8 mode
Using a millimeter video deck, input a 7 MHz signal to the 10-minute portion of the tape in an environment of 25 ° C. and 60% RH,
The difference between the output at 7 MHz and the noise at -1 MHz was determined as the C / N before traveling. Assuming that the value obtained in Example 1 was 0 db, Table 2 shows a relative value to this value.
【００１７】耐久性；上記の評価で７ＭＨｚの信号を入
力した１０分間の部分を４０℃、８０％ＲＨの環境下
で、２００回再生・巻戻しを繰り返した後に、７ＭＨｚ
での出力と、そこから−１ＭＨｚのノイズとの差から走
行後のＣ／Ｎを求め、走行前Ｃ／Ｎからの劣化量をＣ／
Ｎ劣化量として表２に示した。Durability: After repeating the reproduction / rewind 200 times at a temperature of 40 ° C. and 80% RH for 10 minutes in which a signal of 7 MHz was inputted in the above evaluation, the frequency was changed to 7 MHz.
The C / N after traveling is obtained from the difference between the output of the vehicle and the noise of -1 MHz therefrom.
Table 2 shows the N deterioration amount.
【００１８】［評価結果］ 評価結果を表２に示す。表２より、磁性層の厚さが０．
２〜０．６μｍであり、かつ研磨剤として用いたαアル
ミナのｐＨが７．０以下であるとともに、比表面積も１
２．１〜２２．９ｍ２／ｇであり、添加量も４〜１０重
量部の範囲内の場合（実施例１〜７）には、短波長領域
における電磁変換特性が良好で、かつ走行耐久性にも優
れていることがわかる。[Evaluation Results] The evaluation results are shown in Table 2. According to Table 2, the thickness of the magnetic layer is 0.
Α-alumina used as an abrasive has a pH of 7.0 or less and a specific surface area of 1 to 0.6 μm.
2.1 to 22.9 m 2 / g, and when the addition amount is in the range of 4 to 10 parts by weight (Examples 1 to 7), the electromagnetic conversion characteristics in the short wavelength region are good and the running durability is good. It turns out that it is also excellent.
【００１９】これに対して磁性層の厚みが０．６μｍよ
り大きい場合（比較例１、２）は良好な電磁変換特性が
得られないばかりか、微細な（比表面積の大きな）αア
ルミナと組み合わせて使用した場合（比較例２）には、
十分な耐久性も得ることが出来ない。添加量の少ない場
合（比較例３）には、耐久性が十分でなく、繰り返し再
生の途中でヘッドクロッグが発生してしまった。逆に多
すぎた場合（比較例４）には、良好な電変換特性が得ら
れない。On the other hand, when the thickness of the magnetic layer is larger than 0.6 μm (Comparative Examples 1 and 2), not only good electromagnetic conversion characteristics cannot be obtained but also a combination with fine (large specific surface area) α-alumina. When used (Comparative Example 2),
Sufficient durability cannot be obtained. When the amount of addition was small (Comparative Example 3), the durability was not sufficient, and head clogging occurred during repeated reproduction. Conversely, if the amount is too large (Comparative Example 4), good electrical conversion characteristics cannot be obtained.
【００２０】また、磁性層の厚さが０．６μｍより小さ
い場合でも、αアルミナのｐＨが７．０より大きい場合
（比較例５）や比表面積が１２．１ｍ２／ｇより小さい
場合（比較例６）、またはｐＨが７．０より大きいとと
もに、比表面積も１２．１ｍ２／ｇより小さい場合（比
較例７）では良好な電磁変換特性が得られない。Further, even when the thickness of the magnetic layer is smaller than 0.6 μm, when the pH of α-alumina is larger than 7.0 (Comparative Example 5) or when the specific surface area is smaller than 12.1 m 2 / g (Comparative Example) Example 6), or when the pH is higher than 7.0 and the specific surface area is lower than 12.1 m 2 / g (Comparative Example 7), good electromagnetic conversion characteristics cannot be obtained.
【００２１】[0021]
【表２】 [Table 2]
【００２２】[0022]
【発明の効果】以上の説明からも明らかなように本発明
においては、磁性層の厚さのみならず、用いる研磨剤の
比表面積、ｐＨについても所定の値に規定しているの
で、短波長記録に対応すべく薄塗りした場合でも、良好
な電磁変換特性が保たれた上で、なお且つ良好な走行耐
久性を有する磁気記録媒体を得ることが出来る。As is clear from the above description, in the present invention, not only the thickness of the magnetic layer but also the specific surface area and pH of the abrasive used are set to predetermined values. Even when a thin coating is applied for recording, it is possible to obtain a magnetic recording medium having excellent running durability while maintaining good electromagnetic conversion characteristics.
【００２３】従って、本発明によれば、現行のシステム
のみならず、今後考えられている記録波長の短いシステ
ムにおいても電磁変換特性、走行耐久性ともに良好な磁
気記録媒体を得ることが可能である。Therefore, according to the present invention, it is possible to obtain a magnetic recording medium having excellent electromagnetic conversion characteristics and running durability not only in the current system but also in a system having a short recording wavelength which will be considered in the future. .
Claims (1)
を主体とする磁性層が形成されてなる磁気記録媒体にお
いて、 上記磁性層は厚みが０．２〜０．６μｍであって、ＢＥ
Ｔ法による比表面積が１２．１〜２２．９ｍ２／ｇであ
り、かつｐＨが７．０以下のαアルミナを上記強磁性粉
末１００重量部に対して４〜１０重量部含有することを
特徴とする磁気記録媒体。1. A magnetic recording medium in which a magnetic layer mainly composed of ferromagnetic powder and a binder is formed on a non-magnetic support, wherein said magnetic layer has a thickness of 0.2 to 0.6 μm. , BE
It is characterized in that α-alumina having a specific surface area of 12.1 to 22.9 m 2 / g according to the T method and a pH of 7.0 or less is contained in an amount of 4 to 10 parts by weight based on 100 parts by weight of the ferromagnetic powder. Magnetic recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05507992A JP3240672B2 (en) | 1992-03-13 | 1992-03-13 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05507992A JP3240672B2 (en) | 1992-03-13 | 1992-03-13 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05258283A JPH05258283A (en) | 1993-10-08 |
| JP3240672B2 true JP3240672B2 (en) | 2001-12-17 |
Family
ID=12988703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05507992A Expired - Fee Related JP3240672B2 (en) | 1992-03-13 | 1992-03-13 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3240672B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7175927B2 (en) | 2003-11-10 | 2007-02-13 | Hitachi Maxell, Ltd. | Magnetic recording medium utilizing specified non-magnetic particles in the magnetic layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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1992
- 1992-03-13 JP JP05507992A patent/JP3240672B2/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7175927B2 (en) | 2003-11-10 | 2007-02-13 | Hitachi Maxell, Ltd. | Magnetic recording medium utilizing specified non-magnetic particles in the magnetic layer |
| US7517598B2 (en) | 2003-11-10 | 2009-04-14 | Hitachi Maxell, Ltd. | Magnetic recording medium utilizing specified non-magnetic particles in the magnetic layer |
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