JPS5954036A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5954036A JPS5954036A JP57163102A JP16310282A JPS5954036A JP S5954036 A JPS5954036 A JP S5954036A JP 57163102 A JP57163102 A JP 57163102A JP 16310282 A JP16310282 A JP 16310282A JP S5954036 A JPS5954036 A JP S5954036A
- Authority
- JP
- Japan
- Prior art keywords
- carbon black
- adsorbed
- magnetic
- titanium dioxide
- weight
- 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.)
- Granted
Links
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
- G11B5/708—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 addition of non-magnetic particles to the layer
Abstract
Description
【発明の詳細な説明】
本発明は磁気記録媒体に係り、磁性層中に少なくともカ
ーボンブラック吸着二酸化チタン又はカーボンブラック
吸着酸化第ニクロムを含ませておくことにより、磁性層
の耐久性が向上するものとなシ、又帯電防止効果、遮光
性にも優れ、さらには表面光沢性の向上に伴なってＳ／
Ｎも大幅に良好なものとなる磁気記録媒体を提供するこ
とを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording medium, in which the durability of the magnetic layer is improved by containing at least carbon black-adsorbed titanium dioxide or carbon black-adsorbed dichromium oxide in the magnetic layer. It also has excellent antistatic effect and light shielding properties, and with improved surface gloss, S/
It is an object of the present invention to provide a magnetic recording medium in which N is also significantly improved.
従来、ビデオテープレコーダ用の磁気テープ、あるいは
フロッピーディスク等の磁気記録媒体の磁性層中には、
磁性層の耐摩耗性向上の為に、危ＳＯＳ、５ｉｎ２、Ｂ
ｅＣ等の粉末が加えられておシ、又、磁性層の帯電防止
及び遮光性の向上の為に、カーボンブラック等が加えら
れている。Conventionally, in the magnetic layer of magnetic recording media such as magnetic tape for video tape recorders or floppy disks,
In order to improve the abrasion resistance of the magnetic layer, Dangerous SOS, 5in2, B
Powders such as eC are added, and carbon black and the like are added to prevent static electricity and improve light-shielding properties of the magnetic layer.
しかし、これらの添加物によって所望の効果を得ようと
するには、ある程度多く加えなければ々らず、多く加え
れば加える程磁性層中の磁性粉の充填密度は小さくなシ
、シかも磁性層表面も荒れてしまうものとなるので、磁
気特性が低下するものとなり、その為現実にはこれらの
特性の調和を図って用いているにすぎないものである。However, in order to obtain the desired effect with these additives, it is necessary to add them in a certain amount, and the more they are added, the smaller the packing density of the magnetic powder in the magnetic layer becomes. Since the surface becomes rough, the magnetic properties deteriorate, and therefore, in reality, these properties are only used in an attempt to harmonize them.
従って、記録密度等の磁気特性向上の観点からは、 Ａ
ｊ！２０ｓ 、カーボンブラック等の添加量は少ない程
望ましいものと々シ、少量の添加量で帯電防止、遮光性
、耐久性等の特性向上の得られる物質の開発が望まれて
いる。Therefore, from the perspective of improving magnetic properties such as recording density, A
j! It is desirable that the amount of carbon black, etc. added be as small as possible, and it is desired to develop a substance that can improve properties such as antistatic properties, light shielding properties, and durability even with a small amount added.
本発明は上記要望に沿ってなされたものであシ、以下本
発明に係る磁気記録媒体の実施例について説明する。The present invention has been made in response to the above-mentioned demands, and examples of the magnetic recording medium according to the present invention will be described below.
実施例
Ｃｏ含有酸化鉄磁性粉５００重量部、塩化ビニル系樹脂
７０重量部、ポリウレタンエラストマー８０重量部、卵
黄レシチン５重量部、メチルエチルケトン７００重量部
、トルエン７００重量部、平均粒径１００ｍμ以下で比
表面積が３０ｄ１１以上のカーボンブラックをＴｉｅ２
粉末に対して０５重量％以上、例えば約１０重量％吸着
させたカーボンブラック吸着二酸化チタン１５０重量部
以下、平均粒径１００ｍμ以下で比表面積が３０ｄｌ！
！以上のカーボンブラックをＣｒ２Ｏ，粉末に対して０
５重量％以上、例えば約１０重量％吸着させたカーボン
ブラック吸着酸化第ニクロム１００重量部以下の混合物
を、サンドミルで約２０時間混合分散し、これにインシ
アネート系硬化剤を加えて磁性塗料を作シ、この磁性塗
料を例えばポリエステルフィルム等の支持体に約５μ厚
塗布し、乾燥後カレンダー処理し、その後加温して硬化
反応を行なわしめ、そして所定巾にスリットして例えば
ビデオ用磁気テープを得る。Example 500 parts by weight of Co-containing iron oxide magnetic powder, 70 parts by weight of vinyl chloride resin, 80 parts by weight of polyurethane elastomer, 5 parts by weight of egg yolk lecithin, 700 parts by weight of methyl ethyl ketone, 700 parts by weight of toluene, specific surface area with an average particle size of 100 mμ or less Tie2 carbon black with 30d11 or more
The carbon black adsorbed titanium dioxide is 150 parts by weight or less, adsorbed at least 0.5% by weight, for example about 10% by weight, based on the powder, the average particle size is 100 mμ or less, and the specific surface area is 30 dl!
! Carbon black of Cr2O, 0 for powder
A mixture of 100 parts by weight or less of dichromium oxide adsorbed with carbon black of 5% by weight or more, for example about 10% by weight, is mixed and dispersed in a sand mill for about 20 hours, and an incyanate curing agent is added thereto to make a magnetic paint. This magnetic paint is coated to a thickness of about 5μ on a support such as a polyester film, dried, calendered, heated to cause a curing reaction, and then slit to a predetermined width to form, for example, a magnetic tape for video. obtain.
尚、磁性塗料の製造に際しては、磁性粉末とバインダー
とを混合した後、カーボンブラック吸着二酸化チタン等
を添加するようにしてもよく、あるいは磁性粉末、バイ
ンダー、カーボンブラック吸着二酸化チタン、カーボン
ブラック吸着酸化第ニクロムを混合した後、各種の硬化
剤等の添加剤を加えるようにしてもよい。In the production of magnetic paint, after mixing the magnetic powder and binder, carbon black-adsorbed titanium dioxide, etc. may be added, or magnetic powder, binder, carbon black-adsorbed titanium dioxide, carbon black-adsorbed oxidation After mixing dichromium, additives such as various hardening agents may be added.
そして、上記のようにして得られた磁気テープの磁気特
性、例えば角型比を測定すると、第１図に示す如く、カ
ーボンブラック吸着二酸化チタンとカーボンブラック吸
着酸化第ニクロムとの和が磁性粉末に対して約３０重量
％以内の場合には角型比が約０８以上と大きく、磁気特
性が優れたものとなっている。尚、カーボンブラック吸
着二酸化チタンとカーボンブラック吸着酸化第ニクロム
との添加割合によらず、カーボンブラック吸着二酸化チ
タンとカーボンブラック吸着酸化第ニクロムとの総添加
量が、磁性粉末に対して約３０重量％以下の場合には角
型比が優れたものである。When the magnetic properties of the magnetic tape obtained as described above, such as the squareness ratio, are measured, as shown in Figure 1, the sum of carbon black-adsorbed titanium dioxide and carbon black-adsorbed dichromium oxide is the magnetic powder. On the other hand, when the content is less than about 30% by weight, the squareness ratio is as large as about 08 or more, and the magnetic properties are excellent. Incidentally, regardless of the addition ratio of carbon black adsorbed titanium dioxide and carbon black adsorbed dichromium oxide, the total addition amount of carbon black adsorbed titanium dioxide and carbon black adsorbed dichromium oxide is approximately 30% by weight based on the magnetic powder. In the following cases, the squareness ratio is excellent.
又、光センサー等によるテープ端検出機構を備えた記録
再生装置でテープ端検出機構が誤作動するか否かを調べ
る為に、 ９０００Ａの波長の光透過率を測定すると
、カーボンブラック吸着二酸化チタンとカーボンブラッ
ク吸着酸化第ニクロムとの和が、特にカーボンブラック
吸着二酸化チタンが磁性粉末に対して約０５重量％以上
あれば、光透過率は約０．５％以下となシ、光センサー
等によるテープ端検出機構が誤作動しにくいものとなる
。In addition, in order to investigate whether the tape end detection mechanism malfunctions in a recording/playback device equipped with a tape end detection mechanism using an optical sensor, etc., we measured the light transmittance at a wavelength of 9000A, and found that carbon black adsorbed titanium dioxide and If the sum of carbon black adsorbed dichromium oxide and carbon black adsorbed titanium dioxide is about 0.5% by weight or more based on the magnetic powder, the light transmittance will be about 0.5% or less. The end detection mechanism is less likely to malfunction.
又、磁性層の耐久性を調べる為に、繰シ返し再生回数と
再生減磁との関係を測定すると、第３図に示す如く、カ
ーボンブラック吸着酸化第ニクロムとカーボンブラック
吸着二酸化チタンとの和が磁性粉末に対して２０重量％
とし、かつカーボンブラック吸着酸化第ニクロムを磁性
粉末に対して０〜２０重量％の範囲内で変化させたもの
は、カーボンブラック吸着酸化第ニクロム及びカーボン
ブラック吸着二酸化チタンとを全く含まないものに対し
て、再生減磁が著しく小さく、磁性層の耐久性に富んで
いることがわかる。すなわち、カーボンブラック吸着酸
化第ニクロムの添加によって、磁性層の耐久性が向上し
たものとなる。In addition, in order to examine the durability of the magnetic layer, when we measured the relationship between the number of repeated regenerations and the regeneration demagnetization, we found that the sum of carbon black adsorbed dichromium oxide and carbon black adsorbed titanium dioxide was measured as shown in Figure 3. is 20% by weight based on the magnetic powder.
And those in which carbon black adsorbed dichromium oxide is varied within the range of 0 to 20% by weight based on the magnetic powder are different from those containing no carbon black adsorbed dichromium oxide or carbon black adsorbed titanium dioxide. It can be seen that the reproduction demagnetization is extremely small and the magnetic layer is highly durable. That is, the durability of the magnetic layer is improved by adding dichromium oxide adsorbed to carbon black.
又、第４図に示す如く、カラーＳ／Ｎとの関係を調べる
と、すなわち磁性粉末に対して添加カーボンブラック吸
着酸化第ニクロムを０重量％、０５重量％、１０重量％
、２０重量％とし、そしてカーボンブラック吸着酸化第
ニクロムとカーボンブラック吸着二酸化チタンとの和が
磁性粉末に対して３０重量置部下におけるカラーＳ／Ｎ
を測定すると、カーボンブラック吸着二酸化チタン、カ
ーボンブラック吸着酸化第ニクロムの添加によってカラ
ーＳ／Ｎが向上するものとなる。Furthermore, as shown in Fig. 4, when examining the relationship with color S/N, we find that the amount of carbon black adsorbed dichromium oxide added to the magnetic powder is 0% by weight, 05% by weight, and 10% by weight.
, 20% by weight, and the sum of carbon black adsorbed dichromium oxide and carbon black adsorbed titanium dioxide is 30% by weight relative to the magnetic powder.Color S/N
When measured, the color S/N is improved by adding carbon black-adsorbed titanium dioxide and carbon black-adsorbed dichromium oxide.
そして、これらの結果よシ総合的に判断すると、平均粒
径１００ｍμ以下で比表面積３０ ｄ／Ｐ以上のカーボ
ンブラックを吸着させた二酸化チタン粉末が磁性粉に対
して約０．５〜３０重量％、前記と同様なカーボンブラ
ックを吸着させた酸化第ニクロムが磁性粉に対して約１
５重量％以下、かつ前記カーボンブラック吸着二酸化チ
タンとカーボンブラック吸着酸化第ニクロムとの総添加
重量が磁性粉に対して約０５重量％を越えて約３０重量
％以下のものとなるよう、カーボンブラック吸着二酸化
チタンとカーボンブラック吸着酸化第ニクロムとを磁性
層中に含ませておくことによって、極めて優れた磁気記
録媒体となる。Judging comprehensively from these results, titanium dioxide powder adsorbing carbon black with an average particle size of 100 mμ or less and a specific surface area of 30 d/P or more is about 0.5 to 30% by weight of the magnetic powder. , Nichromium oxide adsorbed with carbon black similar to the above has a ratio of about 1 to the magnetic powder.
5% by weight or less, and the total added weight of the carbon black-adsorbed titanium dioxide and the carbon black-adsorbed dichromium oxide is more than about 0.5% by weight and less than about 30% by weight based on the magnetic powder. By including adsorbed titanium dioxide and carbon black adsorbed dichromium oxide in the magnetic layer, an extremely excellent magnetic recording medium can be obtained.
尚、本発明は、カーボンブラック吸着二酸化チタン、カ
ーボンブラック吸着酸化第ニクロムを用いることに特長
があるものであって、単にカーボンブラックと二酸化チ
タンとの混合物、カーボンブラックと酸化第ニクロムと
の混合物といった形態では、本発明のような特長は得ら
れないものである。The present invention is characterized by the use of titanium dioxide adsorbed on carbon black and dichromium oxide adsorbed on carbon black. However, the advantages of the present invention cannot be obtained in this form.
上述の如く、本発明に係る磁気記録媒体は、磁性層中に
、カーボンブラック吸着二酸化チタン又はカーボンブラ
ック吸着酸化第ニクロムを含むものであるので、高角型
比を示すものとなシ、又光センサー等によるテープ端検
出機構に誤作動の起きにくい遮光性に富んだものであシ
、そして繰シ返し再生テストを行なっても再生減磁は小
さく、磁性層の耐久性に富んだものであシ、さらには表
面光沢性が向上してカラーＳ／Ｎも優れたものである等
の特長を有する。As mentioned above, since the magnetic recording medium according to the present invention contains carbon black-adsorbed titanium dioxide or carbon black-adsorbed dichromium oxide in the magnetic layer, it exhibits a high squareness ratio, and also has a high squareness ratio. The tape end detection mechanism must have a high light-shielding property that prevents malfunctions, and even after repeated playback tests, the playback demagnetization is small, and the magnetic layer has high durability. has features such as improved surface gloss and excellent color S/N.
第１図、第２図、第３図及び第４図は、本発明に係る磁
気記録媒体の角型比、光透過率、再生域ａ及Ｕカラー
Ｓ／Ｎの特性を示すグラフである。
第 １ 図
第 ２ 図
カーポ７ブノック１敗宥９勿μ！１７１ｒｌ叶（Ｗｔう
Ｊ第 ３ 図1, 2, 3, and 4 show the squareness ratio, light transmittance, reproduction area a and U color of the magnetic recording medium according to the present invention.
It is a graph showing S/N characteristics. Figure 1 Figure 2 Capo 7 Bunok 1 Defeat 9 No Mu! 171rl Kano (Wt UJ Fig. 3)
Claims (1)
ーボンブラック吸着酸化第ニクロムを含むことを特徴と
する磁気記録媒体。A magnetic recording medium characterized in that the magnetic layer contains carbon black-adsorbed titanium dioxide or carbon black-adsorbed dichromium oxide.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57163102A JPS5954036A (en) | 1982-09-21 | 1982-09-21 | Magnetic recording medium |
| US06/521,577 US4595631A (en) | 1982-08-10 | 1983-08-09 | Magnetic recording media comprising carbon black-adsorbed metal oxide particles in a magnetic recording layer |
| DE3328719A DE3328719C2 (en) | 1982-08-10 | 1983-08-09 | Magnetic recording material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57163102A JPS5954036A (en) | 1982-09-21 | 1982-09-21 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5954036A true JPS5954036A (en) | 1984-03-28 |
| JPH039531B2 JPH039531B2 (en) | 1991-02-08 |
Family
ID=15767206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57163102A Granted JPS5954036A (en) | 1982-08-10 | 1982-09-21 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5954036A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001143243A (en) * | 1999-11-16 | 2001-05-25 | Toda Kogyo Corp | Magnetic recording medium |
| JP2001143242A (en) * | 1999-11-15 | 2001-05-25 | Toda Kogyo Corp | Acicular magnetic particle powder for magnetic recording medium and magnetic recording medium using the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613525A (en) * | 1979-07-16 | 1981-02-09 | Tdk Corp | Magnetic recording medium |
| JPS5724026A (en) * | 1980-07-16 | 1982-02-08 | Tdk Corp | Magnetic recording medium |
| JPS5724027A (en) * | 1980-07-16 | 1982-02-08 | Tdk Corp | Magnetic recording medium |
-
1982
- 1982-09-21 JP JP57163102A patent/JPS5954036A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613525A (en) * | 1979-07-16 | 1981-02-09 | Tdk Corp | Magnetic recording medium |
| JPS5724026A (en) * | 1980-07-16 | 1982-02-08 | Tdk Corp | Magnetic recording medium |
| JPS5724027A (en) * | 1980-07-16 | 1982-02-08 | Tdk Corp | Magnetic recording medium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001143242A (en) * | 1999-11-15 | 2001-05-25 | Toda Kogyo Corp | Acicular magnetic particle powder for magnetic recording medium and magnetic recording medium using the same |
| JP2001143243A (en) * | 1999-11-16 | 2001-05-25 | Toda Kogyo Corp | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH039531B2 (en) | 1991-02-08 |
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