JPH01223703A - Ferromagnetic powder and magnetic recording medium using the same - Google Patents
Ferromagnetic powder and magnetic recording medium using the sameInfo
- Publication number
- JPH01223703A JPH01223703A JP63049321A JP4932188A JPH01223703A JP H01223703 A JPH01223703 A JP H01223703A JP 63049321 A JP63049321 A JP 63049321A JP 4932188 A JP4932188 A JP 4932188A JP H01223703 A JPH01223703 A JP H01223703A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic powder
- powder
- metal
- oxide
- 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
- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 20
- 239000000843 powder Substances 0.000 title claims abstract description 20
- 230000005291 magnetic effect Effects 0.000 title claims description 44
- 239000006247 magnetic powder Substances 0.000 claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 7
- 239000010941 cobalt Substances 0.000 claims abstract description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001004 magnetic alloy Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 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 claims abstract description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract 2
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract 2
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract 2
- 239000001257 hydrogen Substances 0.000 claims abstract 2
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract 2
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 229910000990 Ni alloy Inorganic materials 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract description 2
- 229910052737 gold Inorganic materials 0.000 abstract description 2
- 229910052741 iridium Inorganic materials 0.000 abstract description 2
- 229910052763 palladium Inorganic materials 0.000 abstract description 2
- 229910052703 rhodium Inorganic materials 0.000 abstract description 2
- 229910052707 ruthenium Inorganic materials 0.000 abstract description 2
- ZGDWHDKHJKZZIQ-UHFFFAOYSA-N cobalt nickel Chemical compound [Co].[Ni].[Ni].[Ni] ZGDWHDKHJKZZIQ-UHFFFAOYSA-N 0.000 abstract 1
- 230000003631 expected effect Effects 0.000 abstract 1
- 229910052697 platinum Inorganic materials 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 150000002739 metals Chemical class 0.000 description 6
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 229910001092 metal group alloy Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000013032 photocatalytic reaction Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- NVIVJPRCKQTWLY-UHFFFAOYSA-N cobalt nickel Chemical compound [Co][Ni][Co] NVIVJPRCKQTWLY-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000007772 electroless plating Methods 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- TXUICONDJPYNPY-UHFFFAOYSA-N (1,10,13-trimethyl-3-oxo-4,5,6,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-17-yl) heptanoate Chemical compound C1CC2CC(=O)C=C(C)C2(C)C2C1C1CCC(OC(=O)CCCCCC)C1(C)CC2 TXUICONDJPYNPY-UHFFFAOYSA-N 0.000 description 1
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 229910021626 Tin(II) chloride 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
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- ULBTUVJTXULMLP-UHFFFAOYSA-N butyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCC ULBTUVJTXULMLP-UHFFFAOYSA-N 0.000 description 1
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 1
- CYEPGGGMSRDRBI-UHFFFAOYSA-N cobalt gold nickel Chemical compound [Ni][Co][Au] CYEPGGGMSRDRBI-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 1
- 229940045803 cuprous chloride Drugs 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 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
- 230000001771 impaired effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- WSGCRAOTEDLMFQ-UHFFFAOYSA-N nonan-5-one Chemical compound CCCCC(=O)CCCC WSGCRAOTEDLMFQ-UHFFFAOYSA-N 0.000 description 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 239000001119 stannous chloride Substances 0.000 description 1
- 235000011150 stannous chloride Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 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〕
本発明は磁気記録媒体用酸化物強磁性粉末およびその磁
性粉末を用いた磁気記録媒体に係わり。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to oxide ferromagnetic powder for magnetic recording media and magnetic recording media using the magnetic powder.
さらに詳しくは、その電気伝導度の改良に関する。More specifically, it relates to improving its electrical conductivity.
従来より、磁気テープの走行トラブルの原因の一つとな
る、磁気ヘッド等との摺接によって起るテープの帯電現
象を防止するために、磁性ノー中に導電性のカーボンブ
ラックｆ界面活性剤系の帯電防止剤などを添加混合する
方法が提案されている。Conventionally, in order to prevent the charging phenomenon of tapes caused by sliding contact with magnetic heads, etc., which is one of the causes of running troubles of magnetic tapes, conductive carbon black f surfactant type has been added to magnetic particles. A method of adding and mixing an antistatic agent and the like has been proposed.
しかし、これらの方法は、十分な帯電防止効果を達成す
るためには、これらの物質を多量に添加する必要がある
。ところが、多量の添加はテープの電磁変換特性を低下
させる原因となるため、龜加量は出来るだけ少なくする
ことが望ましい。しかし現在、少量の添加量で十分な帯
電防止効果を発揮させる方法は見出されていない。However, these methods require the addition of large amounts of these substances in order to achieve a sufficient antistatic effect. However, since adding a large amount causes deterioration of the electromagnetic conversion characteristics of the tape, it is desirable to reduce the amount of addition as much as possible. However, at present, no method has been found to achieve a sufficient antistatic effect with a small amount added.
この発明は、従来製品が持っていた磁性層への導電剤の
添加によシ帯電防止を行うと磁気記録媒体の電磁変換特
性が低下すると云う問題点を、磁性粉末自体の導電性を
高めることにより、１に磁変換特性が良好で帯電防止効
果を得ることを目的としている。This invention solves the problem of conventional products, where adding a conductive agent to the magnetic layer to prevent static electricity deteriorates the electromagnetic conversion characteristics of the magnetic recording medium, by increasing the conductivity of the magnetic powder itself. The purpose is to obtain good magnetic conversion characteristics and antistatic effect in 1.
本発明者らは、上記従来欠点を解消するため鋭意検討し
た結果、酸化物磁性粉末の表面に金属コバルトあるいは
コバルト−ニッケル合金などの強磁性金属あるいは合金
を形成させたうえ、これらの磁性粉末の表面に、さらに
特定の金属を付着させたときに、１１１ｓ変換特性を低
下させることなく艮好な帯電防止効果が得られることを
知り、この発明を完成するに至った。As a result of intensive studies to solve the above-mentioned conventional drawbacks, the present inventors formed a ferromagnetic metal or alloy such as metal cobalt or cobalt-nickel alloy on the surface of oxide magnetic powder, and then They found that when a specific metal is further attached to the surface, a good antistatic effect can be obtained without deteriorating the 111s conversion characteristics, and this invention was completed.
酸化物磁性粉末の表面にコバルトおよびニッケルを主体
とする強磁性金属合金を形成させる手段は、特に限定さ
れず無電解メツキ法など金属ノーを形成するための一般
的な手法を任意に採用できる。The means for forming a ferromagnetic metal alloy mainly composed of cobalt and nickel on the surface of the oxide magnetic powder is not particularly limited, and any general method for forming a metal layer such as electroless plating can be employed.
なかでも、特願昭５９−１４１００３号で詳述したよう
な光触媒反応を利用する方法が最も望ましい方法として
推奨できる。すなわち、光触媒反応によれば、酸化物磁
性粉末の表面にこの粉末の形状を損うことのない非常に
均一な磁性金属合金−を形成でき１Ｍｉ気特性上特に望
ましい結果が得られる。Among these, a method using a photocatalytic reaction as detailed in Japanese Patent Application No. 141003/1988 can be recommended as the most desirable method. That is, according to the photocatalytic reaction, a very uniform magnetic metal alloy can be formed on the surface of the oxide magnetic powder without damaging the shape of the powder, and a particularly desirable result can be obtained in terms of 1Mi characteristics.
酸化物磁性粉体の表面に形成させる強磁性金属あるいは
合金１−の童としては、磁性粉中の含有量が５〜ｓｏｗ
ｔ％の範囲が適当である、この童が５ｗｔ％より少ない
と十分な磁気特性の向上が認められず、５０ｗｔ％以と
にすると磁性粉の形状が著しく変化してしまい、バイン
ダ中への分散性。As for the ferromagnetic metal or alloy 1 to be formed on the surface of the oxide magnetic powder, the content in the magnetic powder is 5 to sow.
The range of t% is appropriate.If the powder content is less than 5wt%, sufficient improvement in magnetic properties will not be observed, and if it is more than 50wt%, the shape of the magnetic powder will change significantly and it will be difficult to disperse it in the binder. sex.
配向性が低下する。さらにこの含有量をｌＯ〜４０ｗｔ
％ｖｃｙ４整すれば、最も大きな効果が得られる。Orientation deteriorates. Furthermore, this content is 1O ~ 40wt
The greatest effect can be obtained by adjusting %vcy4.
原料として用いる酸化物磁性粉末としてはγ−Ｆ＠ｚ０
３ 、 Ｃｏ含有ｒ−Ｆｅ２α１ＦｅｓＯ４，Ｃｏ含有
Ｆｅ５０４．バリウムフェライト、 ＣｒＯ２等の磁気
記録媒体に適した強磁性酸化物磁性粉末が挙げられる。The oxide magnetic powder used as a raw material is γ-F@z0
3. Co-containing r-Fe2α1FesO4, Co-containing Fe504. Examples include barium ferrite, CrO2, and other ferromagnetic oxide magnetic powders suitable for magnetic recording media.
次に、表面に強磁性金属ｊ−を有する酸化物磁性粉末の
表面に付着させる非磁性金属は、その酸化還元電位が０
Ｖ以上であることが直装である。すなわち、酸化還元電
位が０Ｖ禾祠の金属では酸化され始＜、このため磁性粉
末表面金属、１が容易に酸化され、磁性粉末の電気抵抗
が高くなって＋＋ｊ１ＪＬ防止効果が得られなくなる。Next, the non-magnetic metal attached to the surface of the oxide magnetic powder having the ferromagnetic metal j- on the surface has a redox potential of 0.
Direct mounting means that it is V or more. That is, metals whose redox potential is 0 V begin to oxidize, and therefore the surface metal of the magnetic powder, 1, is easily oxidized, and the electrical resistance of the magnetic powder becomes high, making it impossible to obtain the ++j1JL prevention effect.
−万０◆■以上の非磁性金属は酸化さ７″Ｌ難いので磁
性粉末に艮好な導電性を与え磁性層の帯電防止に有効に
機能する。Non-magnetic metals with a particle diameter of -0,000◆■ or more are difficult to oxidize by 7"L, so they impart excellent conductivity to the magnetic powder and effectively function to prevent the magnetic layer from being charged.
このような非磁性金属の代表的なものとしては。Typical examples of such non-magnetic metals include:
Ｒｕ、 Ｒｈ、 Ｐｄ、 Ａｇ、 ０８． Ｉｒ、 Ｐ
ｔ、 Ａｕ、 Ｃｕを挙げることができ、これらの金属
の中から一種もしくは二種以上を使用すればよい。これ
らの非磁性金属の付着量としては、被処理粉の磁性粉末
１００重量部に対して０．１〜２．０重量部、好適には
０．２〜１重を部となるようにするのがよい。付着量が
少ないと所期の効果が得られず、多すぎると電磁変特性
を損なうため好ましくない。Ru, Rh, Pd, Ag, 08. Ir, P
Examples of the metals include tungsten, Au, and Cu, and one or more of these metals may be used. The amount of these non-magnetic metals to be deposited is 0.1 to 2.0 parts by weight, preferably 0.2 to 1 part by weight, per 100 parts by weight of the magnetic powder to be treated. Good. If the amount of adhesion is too small, the desired effect cannot be obtained, and if it is too large, the electromagnetic characteristics will be impaired, which is not preferable.
この非磁性金属を付着させる手段は、強磁性金属合金成
させる場合と同様、特に限定されず上記の光触媒反応を
利用する方法、第一一イオンを含む水溶液中に被処理粉
を？！！漬したのち、上記非磁性金属の塩などを含む水
溶液中で還元析出させる無電解メツキ法など、金属層を
形成するための一般的な手法を任意に採用できる。The means for attaching this non-magnetic metal is not particularly limited, as in the case of forming a ferromagnetic metal alloy, and the above-mentioned photocatalytic reaction may be used, or the powder to be treated may be placed in an aqueous solution containing 1-1 ions. ! ! Any general method for forming a metal layer can be employed, such as an electroless plating method in which the metal layer is soaked and then reduced and precipitated in an aqueous solution containing a salt of the nonmagnetic metal.
上記の方法によって得られた母性微粉末を用いて、常法
により磁気テープ、磁気ディスクｔ−製作したとき、を
磁変換特性に優れると共に表面磁気抵抗の低い磁気記録
媒体が得られる。When magnetic tapes and magnetic disks are manufactured by conventional methods using the mother fine powder obtained by the above method, magnetic recording media with excellent magnetic conversion characteristics and low surface magnetic resistance can be obtained.
実施例１
平均長軸径０．３μ涌、平均軸比８．飽和磁化７２．５
ｅｍｕ／、５’、保磁力３２００ｅの７”−ＦｅｚＯｓ
粉末１０００７硫酸ニッケル３００９．ｉ酸コバル）
１７００．９、次亜燐酸ナトリウム１０００．ｐ、クエ
ン酸ナトリウム３２５０９．はう酸２１５０．９ ｔ−
水１００ＪＩＣ溶解し。Example 1 Average major axis diameter 0.3 μm, average axial ratio 8. Saturation magnetization 72.5
emu/, 5', 7"-FezOs with coercive force 3200e
Powder 10007 Nickel Sulfate 3009. cobal i acid)
1700.9, sodium hypophosphite 1000. p, sodium citrate 32509. Hydrolic acid 2150.9 t-
Dissolve 100JIC in water.
水酸化ナトリウムｔ−適量加えてｐ）ｉ９．０に調整し
た溶液中に分散させた。この分散液を撹拌しながら。It was dispersed in a solution adjusted to p)i 9.0 by adding an appropriate amount of sodium hydroxide. While stirring this dispersion.
液温を５０℃に維持し′Ｃ出力ＩＫＷのキセノンランプ
を用いて５時間光照射したのち、濾過、乾燥することに
よりγ−Ｆｅｚｅｓの粒子表面にニッケルーコバルト分
金被膜を形成する。この磁性粉を塩化第一錫７００ ｐ
を浴解し次３０ノの０．ＩＮの塩酸水溶液に４０℃の加
温下で約３０分間撹拌した。After maintaining the liquid temperature at 50 DEG C. and irradiating it with light for 5 hours using a xenon lamp with a C output IKW, it is filtered and dried to form a nickel-cobalt gold coating on the surface of the .gamma.-Fezes particles. This magnetic powder was mixed with 700 p of stannous chloride.
The next 30 minutes of 0. The mixture was stirred in an aqueous hydrochloric acid solution of IN for about 30 minutes while heating at 40°C.
この磁性粉を十分に水洗したのち、塩化パラジウムを１
２ｐ溶解した１０！ｌｏσＯ５Ｎの塩酸水溶液に。After thoroughly washing this magnetic powder with water, add 1 portion of palladium chloride.
2p dissolved 10! loσO5N in aqueous hydrochloric acid solution.
４０℃の加温下で添加して約２０分間撹拌処理した。そ
の後水洗、ｆ１過し九のち乾燥して非磁性金属被膜を有
する磁性粉末を得た。The mixture was added under heating at 40°C and stirred for about 20 minutes. Thereafter, it was washed with water, passed through an F1 filter, and then dried to obtain a magnetic powder having a non-magnetic metal coating.
この磁性粉を用いて
磁性粉 ８００重量部塩化ビニ
ル−酢酸ビニル系共電合体（ＵＣＣ社製、 ＶＡＧＨ）
１１０ｆｆｉ＊Ｗポリウレタン樹
月旨（大日本インキ社製、バンデックスＴ−５２０１）
７０重量部ポリイソシアネート化合
物（日本ポリウレタン社製、コロネー）Ｌ）
２０重量部ステアリン酸−ｎ−ブチル
８重量部メチルインブチルケトン ５ｏｏｉｔ
ｓトルエン ５００重量部上記
組成からなる磁性塗料を調製し、この塗料’？Ｊｌさ２
Ｓμ情のポリエステルフィルム上に乾燥後の厚みが４μ
慣となるように塗匝、乾燥して磁性層を形成し、カンン
ダリング処理を施したのち。Using this magnetic powder, 800 parts by weight of vinyl chloride-vinyl acetate co-electric composite (manufactured by UCC, VAGH) was prepared.
110ffi*W polyurethane jutsuji (manufactured by Dainippon Ink Co., Ltd., Bandex T-5201)
70 parts by weight polyisocyanate compound (manufactured by Nippon Polyurethane Co., Ltd., Coronae L)
20 parts by weight n-butyl stearate
8 parts by weight Methyl in butyl ketone 5ooit
500 parts by weight of toluene A magnetic paint having the above composition was prepared, and this paint'? Jlsa2
The thickness after drying is 4μ on Sμ polyester film.
After applying it as usual, drying it to form a magnetic layer, and applying the conundration process.
所定の偏に截断して磁気テープを作製した。A magnetic tape was produced by cutting it into a predetermined shape.
実施例２
実施例１の塩化パラジウム溶液濃度１．２９／ｌｋ２．
５９／ｌに変更し次以外は、実施例１と同様にして強磁
性粉末と合成し、またこの磁性粉末を用いて磁気テープ
を作成した。Example 2 Palladium chloride solution concentration of Example 1 1.29/lk2.
59/l and synthesized with ferromagnetic powder in the same manner as in Example 1 except for the following, and a magnetic tape was produced using this magnetic powder.
実施例３
実施例１の塩化パラジウムに代えて、塩化銀１．０＆／
ｌの水溶液１０Ｊ１＆：用いた以外は、実施例２と同様
にして強磁性粉末を合成し、またこの磁性粉末を用いて
磁気テープを作成した。Example 3 In place of palladium chloride in Example 1, silver chloride 1.0&/
A ferromagnetic powder was synthesized in the same manner as in Example 2, except that an aqueous solution of 10J1&: was used, and a magnetic tape was made using this magnetic powder.
実兄例４
実施例１の塩化パラジウムに代えて、塩化第一銅１．３
Ｅｌ／ｌの水浴液ｌｉｔを用い友以外は、実施例１と
同様にして強磁性粉末を合成し、この磁性粉を用いて磁
気テープ金作成した、
実施例５
実施例１のγ−Ｆｅｚｅｓの代りに平均板径０．０６μ
溝、飽和磁化５４．１ ｅｍｕ／、！ｉ’ 、保磁力５
５００ｅ。Actual Example 4 Instead of palladium chloride in Example 1, cuprous chloride 1.3
A ferromagnetic powder was synthesized in the same manner as in Example 1 except that a water bath liquid of El/l was used, and a magnetic tape was made using this magnetic powder. Example 5 The γ-Fezes of Example 1 Instead, the average plate diameter is 0.06μ
Groove, saturation magnetization 54.1 emu/,! i', coercive force 5
500e.
角型比０．４４のバリウムフェライト紛を便用した以外
は、実施例１と同様にして強磁性粉末を合成し、この磁
性粉を用いて磁気テープを作成した。A ferromagnetic powder was synthesized in the same manner as in Example 1, except that barium ferrite powder with a squareness ratio of 0.44 was used, and a magnetic tape was made using this magnetic powder.
比較例１
実施例１にふ・いてコバルト−ニッケルｏ合金＋ｉ＊を
形成することなしに、塩化第−賜、塩化パラジウム処理
以下を＊雄側１と同様にして強磁性粉末を合成し、この
磁性粉を用いて磁気テープを作成した。Comparative Example 1 A ferromagnetic powder was synthesized in the same manner as in Example 1, except that the cobalt-nickel o alloy +i* was not formed, but the treatment with dichloromethane and palladium chloride was carried out in the same manner as in Male Side 1. A magnetic tape was created using magnetic powder.
比較例２
実施例１において用い之γ−Ｆｅ２０ｓに、磁性合金層
、非磁性金属Ｊ−を設けないものを磁性粉とし。Comparative Example 2 Magnetic powder was prepared using γ-Fe20s used in Example 1 without providing a magnetic alloy layer and non-magnetic metal J-.
実施例１の磁性塗料に導［性力−ボンブラックを３０重
を部追加し、このＭｉ性塗料？用いて、実施例１と同様
にして磁気テープを作成した。To the magnetic paint of Example 1, add 30 parts of atomic black to the magnetic paint. A magnetic tape was prepared in the same manner as in Example 1.
上記各実施例、比ｆ例で得られた強磁性粉末については
、ｌｉＢ性初０．３ 、＠採取し、直径１３αのベレッ
トに加圧成形し、このペレットをアルミニウム！極板に
はさみ、テスターで電気抵抗全測定した。The ferromagnetic powder obtained in each of the above Examples and Ratio Example was collected with a liB property of 0.3 and pressed into a pellet with a diameter of 13α, and this pellet was made of aluminum! It was sandwiched between electrode plates and the total electrical resistance was measured using a tester.
″１念、？！ｒ実施例、比較例で得た磁気テープについ
ては、電磁変換特性および磁性／ｉｍの表面電気抵抗を
測定した。For the magnetic tapes obtained in Examples and Comparative Examples, electromagnetic conversion characteristics and surface electrical resistance of magnetism/im were measured.
感度、ＭｏＬＩ／′ｉ比較例２の磁気テープを基準とし
。Sensitivity, MoLI/'i based on the magnetic tape of Comparative Example 2.
それとの比較塩で示した。It is shown in comparison with that.
以上説明したように、酸化物磁性粉末表面にコバルト−
ニッケルの磁性合金ｊ媚を形成し、さらにその上に非磁
性金属Ｊ−を形成し、電気抵抗を下げた強磁性粉を用い
た磁気記録媒体は、従来の酸化物磁性粉末を用いた磁気
記録媒体に比し、電磁変換特注を低下させることなく１
表面電気抵抗を下げることができる。よって１Ｍｉ気テ
ープなどの走行トラブル七人］陽に減少させることがで
きる。As explained above, cobalt is added to the surface of the oxide magnetic powder.
Magnetic recording media using ferromagnetic powder, which has a magnetic alloy of nickel and a non-magnetic metal on top of it to lower electrical resistance, are different from conventional magnetic recording using oxide magnetic powder. 1 without reducing electromagnetic conversion customization compared to media
Surface electrical resistance can be lowered. Therefore, running troubles such as 1M tape can be significantly reduced.
特許出願人 日立マクセル株式会社 代表者 水 井 厚Patent applicant: Hitachi Maxell, Ltd. Representative Atsushi Mizu
Claims (4)
を主成分とする磁性合金属を形成させた磁性粉表面に酸
化還元電位が、標準水素電極電位に対して０Ｖ以上の非
磁性金属を付着させ、電気抵抗が１Ω〜５×１０＾６Ω
であることを特徴とする強磁性粉末。(1) A non-magnetic metal whose oxidation-reduction potential is 0V or more with respect to the standard hydrogen electrode potential is attached to the surface of the magnetic powder, in which a magnetic alloy mainly composed of cobalt and nickel is formed on the surface of the oxide magnetic powder. , electrical resistance is 1Ω~5×10^6Ω
A ferromagnetic powder characterized by:
ェライト磁性粉末、酸化クロム磁性粉末から選ばれる少
なくとも一種であることを特徴とする請求項（１）記載
の強磁性粉末。(2) The ferromagnetic powder according to claim (1), wherein the oxide magnetic powder is at least one selected from iron oxide magnetic powder, barium ferrite magnetic powder, and chromium oxide magnetic powder.
して０．１〜２．０重量部であることを特徴とする請求
項（１）ないし（２）記載の強磁性粉末。(3) The ferromagnetic powder according to any one of claims (1) and (2), wherein the amount of the non-magnetic metal deposited is 0.1 to 2.0 parts by weight per 100 parts by weight of the magnetic powder.
磁性粉末の表面にコバルトおよびニツケルを主成分とす
る磁性合金層を形成させた磁性粉表面に酸化還元電位が
、標準水素電極電位に対して０Ｖ以上の非磁性金属を付
着させ、電気抵抗が１Ω〜Ｓ×１０＾−＾６Ωである強
磁性粉末を含有することを特徴とする磁気記録媒体。(4) In a magnetic layer formed on a non-magnetic support, a magnetic alloy layer mainly composed of cobalt and nickel is formed on the surface of an oxide magnetic powder. A magnetic recording medium characterized in that it contains a ferromagnetic powder having an electric resistance of 1Ω to S×10^-^6Ω and a nonmagnetic metal having a voltage of 0V or more with respect to an electrode potential attached thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63049321A JPH01223703A (en) | 1988-03-02 | 1988-03-02 | Ferromagnetic powder and magnetic recording medium using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63049321A JPH01223703A (en) | 1988-03-02 | 1988-03-02 | Ferromagnetic powder and magnetic recording medium using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01223703A true JPH01223703A (en) | 1989-09-06 |
Family
ID=12827707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63049321A Pending JPH01223703A (en) | 1988-03-02 | 1988-03-02 | Ferromagnetic powder and magnetic recording medium using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01223703A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019146661A1 (en) * | 2018-01-23 | 2019-08-01 | パウダーテック株式会社 | Composite particle, powder, resin composition, and molded article |
| JPWO2019159800A1 (en) * | 2018-02-13 | 2021-02-12 | パウダーテック株式会社 | Composite particles, powders, resin compositions and moldings |
-
1988
- 1988-03-02 JP JP63049321A patent/JPH01223703A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019146661A1 (en) * | 2018-01-23 | 2019-08-01 | パウダーテック株式会社 | Composite particle, powder, resin composition, and molded article |
| JPWO2019146661A1 (en) * | 2018-01-23 | 2021-03-25 | パウダーテック株式会社 | Composite particles, powders, resin compositions and moldings |
| JPWO2019159800A1 (en) * | 2018-02-13 | 2021-02-12 | パウダーテック株式会社 | Composite particles, powders, resin compositions and moldings |
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