JPH0287606A - Ferromagnetic powder and magnetic recording medium using same - Google Patents
Ferromagnetic powder and magnetic recording medium using sameInfo
- Publication number
- JPH0287606A JPH0287606A JP63240510A JP24051088A JPH0287606A JP H0287606 A JPH0287606 A JP H0287606A JP 63240510 A JP63240510 A JP 63240510A JP 24051088 A JP24051088 A JP 24051088A JP H0287606 A JPH0287606 A JP H0287606A
- Authority
- JP
- Japan
- Prior art keywords
- ferromagnetic powder
- cobalt
- ferrite
- amount
- magnetic
- 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
- 239000000843 powder Substances 0.000 title claims abstract description 41
- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 39
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 34
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 32
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 13
- 239000010941 cobalt Substances 0.000 claims abstract description 13
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract description 6
- 150000001868 cobalt Chemical class 0.000 abstract description 4
- 239000007864 aqueous solution Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 239000006229 carbon black Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229940044175 cobalt sulfate Drugs 0.000 description 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- SFMJNHNUOVADRW-UHFFFAOYSA-N n-[5-[9-[4-(methanesulfonamido)phenyl]-2-oxobenzo[h][1,6]naphthyridin-1-yl]-2-methylphenyl]prop-2-enamide Chemical compound C1=C(NC(=O)C=C)C(C)=CC=C1N1C(=O)C=CC2=C1C1=CC(C=3C=CC(NS(C)(=O)=O)=CC=3)=CC=C1N=C2 SFMJNHNUOVADRW-UHFFFAOYSA-N 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Compounds Of Iron (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、磁気記録素子としての六方晶フェライト強
磁性粉末に係わり、さらに詳しくはその導電性の改良に
関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to hexagonal ferrite ferromagnetic powder as a magnetic recording element, and more particularly to improvement of its electrical conductivity.
近年、磁気記録の高密度化に伴って特に短波長域での高
出力を得ることを目的として磁性層面に対して垂直な磁
化成分を利用する次め、 Ｂａ、 Ｓｒ。In recent years, with the increase in the density of magnetic recording, the use of magnetization components perpendicular to the magnetic layer surface has been developed with the aim of obtaining high output, especially in the short wavelength range.
ｐｂフェライトなどの磁化容易軸が粒子板面に対して垂
直でめる板状の六方晶フェライト粉からなる磁性粉の二
傳用注が増している。The use of magnetic powders consisting of plate-shaped hexagonal ferrite powders such as PB ferrite whose easy axis of magnetization is perpendicular to the particle plate surface is increasing.
−万、この六方晶フェライト粉は、＜の電気抵抗が非常
に高く、これを用い次磁気記録媒体の磁性、傭の表面電
気抵抗が著しく高くなり、帯電による走行トラブルがあ
り、この解決が望”Ｉｎでいる。-This hexagonal ferrite powder has a very high electrical resistance, and when it is used, the magnetic recording medium has a significantly high surface electrical resistance, which causes running troubles due to charging, and it is desirable to solve this problem. “Stay In.
従来は、六方晶フェライト強磁性粉を含む磁性層中にカ
ーボンブラックを導電性粒子として含有させることによ
り２磁゛性層表面の電気抵抗を低減させる方法が採用さ
れている。しかしながら強磁性粉の導電性が悪い之め、
磁性層表面の磁気抵抗全低減させるため、磁′註層中に
含ませるカーボンブラックの添加量が多くなる。これは
塗布層の表面平ｉｆ注を損なつ之シ、扮落ちの問題が顕
著となり、磁気記録媒体として１磁変換特性に照影Ｓを
及ぼす。Conventionally, a method has been adopted in which the electrical resistance on the surface of a bimagnetic layer is reduced by incorporating carbon black as conductive particles in a magnetic layer containing hexagonal ferrite ferromagnetic powder. However, due to the poor conductivity of ferromagnetic powder,
In order to completely reduce the magnetic resistance on the surface of the magnetic layer, the amount of carbon black added to the magnetic layer is increased. This impairs the surface flatness of the coating layer, and the problem of shedding becomes significant, which affects the magnetic conversion characteristics of the magnetic recording medium.
この発明は、六方晶フェライト強磁性粉の１！気抵抗が
高いという問題点を解決し、以って表面電気抵抗が低く
、かつ磁気特注にも優れた磁気記録媒体を提供すること
を目的とする。This invention is a hexagonal ferrite ferromagnetic powder. The object of the present invention is to solve the problem of high electrical resistance, thereby providing a magnetic recording medium that has low surface electrical resistance and is excellent in magnetic customization.
六方晶フェライト強磁性粉の表面にコバルトフェライト
被膜を形成させることにより、磁気Ｉｔ金損うことなく
、六方晶フェライト強磁性粉の電気抵抗が低減すること
がわかり几。よってこの強磁性粉を用いた磁気記録媒体
の磁性層のｍ気抵抗は導電剤であるカーボンブラックを
含ませなくても低くでき、ま之より低い電気抵抗値の磁
性層を得るには、従来の強磁性粉を用い之磁気記録媒体
に比し少ないカーボンブランク量ですますことができる
。It was found that by forming a cobalt ferrite coating on the surface of hexagonal ferrite ferromagnetic powder, the electrical resistance of hexagonal ferrite ferromagnetic powder was reduced without damaging the magnetic metal. Therefore, the magnetic resistance of the magnetic layer of a magnetic recording medium using this ferromagnetic powder can be lowered without including carbon black, which is a conductive agent. Using ferromagnetic powder, the amount of carbon blank can be reduced compared to magnetic recording media.
六方晶フェライト強磁性粉表面にコバルトフェライト被
膜を形成するには、コバルト塩と、第一鉄塩を含む水溶
液中に六方晶７工ライト強磁性粉を分散させ、こＡを６
０℃以との温度で５時間以上７１ＥＩ熱すればよい。To form a cobalt ferrite coating on the surface of hexagonal ferrite ferrite powder, the hexagonal heptagonal ferrite ferromagnetic powder is dispersed in an aqueous solution containing cobalt salt and ferrous salt.
It is sufficient to heat the product at 71EI for 5 hours or more at a temperature of 0° C. or lower.
コバルトフェライト被膜量は、コバルト塩、第一鉄塩の
防用ｔと、六方晶フェライト強磁性粉の添７ＩＩＩｉｋ
ｔ−変化させて所望の蝋とする。The amount of cobalt ferrite coating is the amount of cobalt salt, ferrous salt, and the addition of hexagonal ferrite ferromagnetic powder.
t-change to obtain the desired wax.
コバルトフェライトａ膜量が０．１重量％以下となると
１強磁性粉の電気抵抗が所定値まで低下せず、一方１０
重量％以上になると１強磁性粉の住気特性が低下して好
ましくない。When the amount of cobalt ferrite a film is less than 0.1% by weight, the electrical resistance of the 1 ferromagnetic powder does not decrease to the specified value;
If it exceeds % by weight, the ferromagnetic powder 1 will have poor air quality, which is not preferable.
と記の強磁性粉を用い之磁気記録媒体は、従来より行な
はれている製法によって作製することができる。A magnetic recording medium using the ferromagnetic powder can be manufactured by a conventional manufacturing method.
以下１本発明を実施例に基づき説明する。 The present invention will be explained below based on examples.
実施例１
水ｌｌに水酸化ナトリウム１００ｇ１浴解した高アルカ
リ水溶液に硫酸コバルト１５ｇおよび硫酸第一鉄４０ｐ
’ｉ浴解する。この水ｍ液に平均粒子径０．０７μｍ、
平均粒子厚み０．００８５μｒｘ、粒子径／粒子厚さが
８．２．飽和磁化６０．０ ｅｍｕ／Ｉ 、保磁力５３
００ｓのバリウムフェライト強磁性粉１００．９’ｉ分
散させ、この分散ｉを７０°Ｃｏ温度で６時間加熱した
のち、水洗１口過、乾燥し、バリウムフェライト強磁性
粉の表面にコバルトフェライト／ＩＩを有する強磁性粉
末を得比。Example 1 100 g of sodium hydroxide in 1 liter of water 15 g of cobalt sulfate and 40 p of ferrous sulfate in a highly alkaline aqueous solution dissolved in water
'I'll take a bath. This water solution has an average particle size of 0.07 μm,
Average particle thickness is 0.0085 μrx, particle diameter/particle thickness is 8.2. Saturation magnetization 60.0 emu/I, coercive force 53
After dispersing 100.9'i of barium ferrite ferromagnetic powder of 00s and heating this dispersion i at 70 ° Co temperature for 6 hours, washing with water once and drying, cobalt ferrite/II was dispersed on the surface of barium ferrite ferromagnetic powder. Obtain a ferromagnetic powder with a ratio of
実施例２
実施例１の水酸化ナトリウムの夏用ｉ／に１００ ｐ全
１３０ｇに、硫酸第一鉄の使用量４０ｇを９０９に変更
し之以外は実施例１と同様にして強磁注扮？得た。Example 2 Ferromagnetic injection was carried out in the same manner as in Example 1, except that the amount of sodium hydroxide used in Example 1 was changed to 100 p in total to 130 g, and the amount of ferrous sulfate used was changed from 40 g to 909. Obtained.
実施例３
実施例１において６分散液の処理温度７０℃を９０℃に
変更し之以外は実施例１と同様にして強磁性粉を得几。Example 3 A ferromagnetic powder was obtained in the same manner as in Example 1, except that the treatment temperature for the 6 dispersion liquid in Example 1 was changed from 70°C to 90°C.
実施例４
実施例１で得た強磁性粉 １００ｉｉｊｉ１部
塩ビー酢と系共ポ合体（ＵＣＣ社製、ＶＡＧＨ）１４ｇ
量部
ポリウレタン樹脂（犬日本インキ社製、パンテックスＴ
５２０１） ９改盪部ポリイン７ア
ネート化合物（日本ポリウレタン社製、コロネートＬ）
２重量部メチルエチルケトン
６２重量部トルエン ６
２重量部上記組成からなる磁性塗料を調製し、この塗料
を厚さ２５μｍのポリエステルフィルム上に、乾燥後の
塗膜厚が４μｍとなるように、塗布、乾燥して磁性層を
形成し、カレンダリング処理を力也したのち、所定幅に
裁断して磁気テープを作製し九。Example 4 100 iiji 1 part ferromagnetic powder obtained in Example 1 14 g of chlorinated vinyl vinegar and system copolymer (manufactured by UCC, VAGH)
Polyurethane resin (manufactured by Inu Nippon Ink Co., Ltd., Pantex T)
5201) 9 modified part polyin 7 anate compound (manufactured by Nippon Polyurethane Co., Ltd., Coronate L)
2 parts by weight methyl ethyl ketone
62 parts by weight toluene 6
2 parts by weight A magnetic paint having the above composition was prepared, and this paint was coated on a polyester film with a thickness of 25 μm so that the coating thickness after drying was 4 μm, and dried to form a magnetic layer. After the rendering process was completed, magnetic tape was produced by cutting it to a specified width.9.
実施例５
実施例４の強磁性粉に変えて、実施例２で得た強磁性粉
を同量用い几以外は、実施例４と同様にして磁気テープ
を作製した。Example 5 A magnetic tape was produced in the same manner as in Example 4, except that the same amount of the ferromagnetic powder obtained in Example 2 was used instead of the ferromagnetic powder in Example 4.
比較例１
実施例４において１強磁性粉として実施例１のコバルト
フェライトｊ−金形成する前のバリウムフェライト強磁
性粉を、同量用い九以外は実施例４と同様にして磁気テ
ープを作製した。Comparative Example 1 A magnetic tape was produced in the same manner as in Example 4 except for using the same amount of barium ferrite ferromagnetic powder before forming the cobalt ferrite J-gold of Example 1 as the ferromagnetic powder in Example 4. .
と記実施例１〜３０強磁性粉については、その電気抵抗
を、また実施例４．５および比較例で得７を磁気テープ
については、その磁性Ｉ−の表面電気抵抗を−ｆ：ｔ′
ＬぞれｍＪ定した。For the ferromagnetic powders of Examples 1 to 30, the electrical resistance is expressed as -f:t', and for the magnetic tape, the surface electrical resistance of the magnetic I- is expressed as -f:t'
mJ was determined for each L.
以上説明したように、六方晶フェライト強磁性粉の表面
にコバルトフェライトＪ−を設けた強磁性粉は、その電
気抵抗が低くなり、この強磁性粉を用い几磁気記録媒体
の磁性層の表面電気抵抗も低減する。よって磁気記録媒
体の帯電防止の面で優れ之効果がある。As explained above, the ferromagnetic powder in which cobalt ferrite J- is provided on the surface of the hexagonal ferrite ferromagnetic powder has a low electrical resistance, and this ferromagnetic powder can be used to increase the surface electrical resistance of the magnetic layer of the magnetic recording medium. It also reduces resistance. Therefore, it has an excellent effect in preventing static electricity on the magnetic recording medium.
出願人 日立マクセル株式会社 代表者 水 井 厚Applicant: Hitachi Maxell, Ltd. Representative Atsushi Mizu
Claims (3)
ライト被膜を形成させたことを特徴とする強磁性粉末。(1) A ferromagnetic powder characterized by forming a cobalt ferrite coating on the surface of hexagonal ferrite ferromagnetic powder.
フェライトの被覆重が０．１〜１５重量％であることを
特徴とする強磁性粉末。(2) The ferromagnetic powder according to claim (1), wherein the coating weight of cobalt ferrite is 0.1 to 15% by weight.
合剤とを主体として含む磁性層を非磁性支持体上に塗布
してなることを特徴とする磁気記録媒体。(3) A magnetic recording medium comprising a magnetic layer mainly containing the ferromagnetic powder according to claims (1) or (2) and a binder, coated on a non-magnetic support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63240510A JPH0287606A (en) | 1988-09-26 | 1988-09-26 | Ferromagnetic powder and magnetic recording medium using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63240510A JPH0287606A (en) | 1988-09-26 | 1988-09-26 | Ferromagnetic powder and magnetic recording medium using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0287606A true JPH0287606A (en) | 1990-03-28 |
Family
ID=17060590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63240510A Pending JPH0287606A (en) | 1988-09-26 | 1988-09-26 | Ferromagnetic powder and magnetic recording medium using same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0287606A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6199306A (en) * | 1984-10-22 | 1986-05-17 | Dowa Mining Co Ltd | Oxide magnetic material and manufacture thereof |
| JPS62139123A (en) * | 1985-12-12 | 1987-06-22 | Toda Kogyo Corp | Fine plate ba ferrite corpuscle powder for magnetic recording and its production |
| JPS63144118A (en) * | 1986-12-04 | 1988-06-16 | Matsushita Electric Ind Co Ltd | Magnetic powder of complex type and production thereof |
-
1988
- 1988-09-26 JP JP63240510A patent/JPH0287606A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6199306A (en) * | 1984-10-22 | 1986-05-17 | Dowa Mining Co Ltd | Oxide magnetic material and manufacture thereof |
| JPS62139123A (en) * | 1985-12-12 | 1987-06-22 | Toda Kogyo Corp | Fine plate ba ferrite corpuscle powder for magnetic recording and its production |
| JPS63144118A (en) * | 1986-12-04 | 1988-06-16 | Matsushita Electric Ind Co Ltd | Magnetic powder of complex type and production thereof |
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