JPS5841437A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5841437A JPS5841437A JP56137444A JP13744481A JPS5841437A JP S5841437 A JPS5841437 A JP S5841437A JP 56137444 A JP56137444 A JP 56137444A JP 13744481 A JP13744481 A JP 13744481A JP S5841437 A JPS5841437 A JP S5841437A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- average particle
- particle size
- oxide
- particles
- 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
- 239000002245 particle Substances 0.000 claims abstract description 41
- 238000000576 coating method Methods 0.000 claims description 23
- 239000011248 coating agent Substances 0.000 claims description 21
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 claims description 20
- 239000011347 resin Substances 0.000 abstract description 6
- 229920005989 resin Polymers 0.000 abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000011230 binding agent Substances 0.000 abstract description 4
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000006249 magnetic particle Substances 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 239000006247 magnetic powder Substances 0.000 description 7
- 235000001270 Allium sibiricum Nutrition 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000011882 ultra-fine particle Substances 0.000 description 5
- 229920002554 vinyl polymer Polymers 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000004014 plasticizer Substances 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- VCGRFBXVSFAGGA-UHFFFAOYSA-N (1,1-dioxo-1,4-thiazinan-4-yl)-[6-[[3-(4-fluorophenyl)-5-methyl-1,2-oxazol-4-yl]methoxy]pyridin-3-yl]methanone Chemical compound CC=1ON=C(C=2C=CC(F)=CC=2)C=1COC(N=C1)=CC=C1C(=O)N1CCS(=O)(=O)CC1 VCGRFBXVSFAGGA-UHFFFAOYSA-N 0.000 description 1
- 101100481408 Danio rerio tie2 gene Proteins 0.000 description 1
- 101100481410 Mus musculus Tek gene Proteins 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 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
- G11B5/68—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
- G11B5/7085—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 non-magnetic abrasive particles
Abstract
Description
【発明の詳細な説明】
本発明はオーディオ用２ビデオ用、コンビ、−ター用等
の磁気記帰媒体に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording medium for audio, 2-video, combination, ter, etc.
一般に、オーディオ用、ビデオ用、：１ンビ、−ター用
の磁気チーブなどの磁気記録媒体はその磁性塗膜が摩耗
し易いため１耐摩耗性向上剤、走行性改曳剤として毛−
ス硬度６以上て０．１４ａ以上の平均粒子サイズを有す
る非磁性粉末を磁性粉に添加することが行なわれている
。しかし、このような非磁性粉末が磁性塗膜中で均一に
分散されていないと、十分な耐摩耗性が得られないばか
シでなく、磁気ヘッドの損傷とい−）九問題も生じる。In general, the magnetic coating film of magnetic recording media such as magnetic chips for audio, video, and television is easily worn out, so hair is used as an abrasion resistance improver and runnability modifier.
Non-magnetic powder having a hardness of 6 or more and an average particle size of 0.14a or more is added to magnetic powder. However, if such non-magnetic powder is not uniformly dispersed in the magnetic coating, not only will sufficient wear resistance not be obtained, but problems such as damage to the magnetic head will also occur.
本発明者らは、このような現象を防ぐべく磁性塗膜中で
分散性に優れ、耐摩耗性を向上させる添加剤につき鋭意
研究を行なった結果、モース硬度が６以上で平均粒径が
０．１〜２声ｍの非磁性酸化物と、平均妓径０．０’５
４ｍ以下の超微粒非磁性酸化物とを併用して磁性塗膜中
に分散させた場合１単に平均粒径０．１〜２声重の非磁
性酸化物を同重量分散させたときよりも磁性塗膜の耐摩
耗性が飛躍的に向上することを見い出し、本発明をなす
に至ったものである。In order to prevent this phenomenon, the present inventors conducted extensive research on additives that have excellent dispersibility in magnetic coatings and improve wear resistance. Non-magnetic oxide with a diameter of .1 to 2 meters and an average diameter of 0.0'5
When dispersed in a magnetic coating in combination with ultrafine non-magnetic oxide particles of 4 m or less, the magnetic properties are higher than when the same weight of non-magnetic oxide particles with an average particle size of 0.1 to 2 particles are dispersed. It was discovered that the abrasion resistance of the coating film was dramatically improved, and the present invention was completed.
以下、本実１４Ｋ）Ｉ詳しく説明する・本発明に係る磁
気配録媒体は、モース硬度が６以上で平均粒径が０．１
〜２μ重の非磁性酸化物と、平均粒径０．０５７Ｌｍ以
下の超微粒非磁性酸化物とを併用して磁性塗膜中に分散
させてなるものである。Hereinafter, the present invention will be explained in detail. The magnetic recording medium according to the present invention has a Mohs hardness of 6 or more and an average grain size of 0.1.
It is made by dispersing in a magnetic coating film a non-magnetic oxide with a weight of ~2μ and an ultra-fine non-magnetic oxide with an average particle size of 0.057 Lm or less.
この場合、磁性塗膜は磁性粉とバインダーによシ形成さ
れ得るが、磁性粉としてはγ−Ｆ・２０５等の通常磁気
記録媒体に使用されるものを用いることができ、またバ
インダーもビニル樹脂その他の通常磁気記録媒体に使用
されるものを用いることができる。この磁性ｍ膜は公知
の方法により所定の基体上に塗布することができる。In this case, the magnetic coating film can be formed from magnetic powder and a binder, but the magnetic powder used can be those normally used for magnetic recording media, such as γ-F.205, and the binder is also made of vinyl resin. Other materials commonly used in magnetic recording media can be used. This magnetic m-film can be coated on a predetermined substrate by a known method.
前記磁性塗膜に分散される平均粒径０．１〜２ｓＨの非
磁性酸化物としてはモース硬度が６以上のＡｔ２０．
、 Ｔｉｅ２＊ Ｃｒ２Ｏ５ｔ ８１０２等の金属酸化
物が好適なものとして例示され、これらの１種又は２種
以上を磁性塗膜中に分教場せることかできる。The non-magnetic oxide with an average particle diameter of 0.1 to 2 sH to be dispersed in the magnetic coating film is At20.0 with a Mohs hardness of 6 or more.
, Tie2*Cr2O5t 8102 and the like are exemplified as suitable metal oxides, and one or more of these can be included in the magnetic coating.
なお、これら非磁性酸化物のより好ましい平均粒径は０
．２〜１μｍである。The more preferable average particle size of these nonmagnetic oxides is 0.
．． It is 2 to 1 μm.
前記平均粒径０．１〜２μｍの非磁性酸化物と併用され
る平均粒径０．０５μｍ以下の非磁性酸化物としては、
Ａｚ、ｏ、 −Ｔｌ０ｚ ｅ Ｃｒｚ０３．８１０２等
の金属酸化物が好適なものとして例示され、これらの１
種又は２種以上が使用され得る。この場合、平均粒径０
．１〜２１ｔｍの非磁性酸化物と平均粒径０．０５声ｍ
以下Ｏ＄磁性酸化物とは互に同種のものを使用して１も
異種のものを使用しても差支えない。なお、この超微粒
非磁性酸化物のよシ好ましい平均粒径は０．０３声ｍ以
下である。また、平均粒ａｏ、ｏｓμｍ以下の非磁性酸
化物の使用量は、磁性塗膜中に分散される非磁性酸化物
全体の３〜３０重量％とすることが好ましく、この使用
量範囲において本発明の目的をよ）確実にかつ棗好に遍
成すゐことができる・
なお、非磁性酸化物の総使用量（平均粒＠ ０．１〜２
趨の非磁性酸化物と平均粒径ｏ、ｏｓｄ非磁性酸化物の
使用量の総和）は、必ずしも制限されないが、磁性１１
！ＩＭ全体の１〜１５重量％とすることが好ましい・
平均粒＆ ０．１〜２＃１の非磁性酸化物と平均粒径０
．０５岸鳳以下の非磁性酸化物とを併用して磁性塗膜に
分散させる方法に紘特に制限はなく、平均粒径０．０５
μ履以下の非磁性酸化物を平均粒径０．１〜２ Ａｍの
非磁性酸化物と別個に分散させることもでき、また両者
を予め混合した混合物を分散させるようにしてもよいが
、特に両者を均一に分散混合し九混合物を磁性粉やバイ
ンダーとともＫＩＬ練して磁性１１１膜を形成する方法
が最も添加剤の分散性がよく、磁性ｍ膜の耐摩粍性をよ
〕向上させることができる。As the non-magnetic oxide with an average particle size of 0.05 μm or less used in combination with the non-magnetic oxide with an average particle size of 0.1 to 2 μm,
Metal oxides such as Az, o, -Tl0z e Crz03.8102 are exemplified as suitable ones, and these 1
A species or more than one species may be used. In this case, the average particle size is 0
．． Non-magnetic oxide of 1 to 21 tm and average particle size of 0.05 m
Hereinafter, the O$ magnetic oxides may be of the same type, or different types may be used. The average particle diameter of this ultrafine nonmagnetic oxide is preferably 0.03 m or less. Further, the amount of the non-magnetic oxide with average particle sizes of ao and os μm or less is preferably 3 to 30% by weight of the total non-magnetic oxide dispersed in the magnetic coating film, and within this amount range, the present invention The total amount of non-magnetic oxide used (average grain @ 0.1-2
The total amount of non-magnetic oxides used, average particle size o, and osd non-magnetic oxides are not necessarily limited, but magnetic 11
! It is preferable to make it 1 to 15% by weight of the entire IM. Average grain & 0.1 to 2 #1 non-magnetic oxide and average grain size 0
．． There is no particular restriction on the method of dispersing into a magnetic coating film using a non-magnetic oxide of 0.05 or less, and the average particle size is 0.05.
The non-magnetic oxide with an average particle size of 0.1 to 2 Am may be separately dispersed, or a mixture of the two may be dispersed. The method of uniformly dispersing and mixing the two and kneading the mixture with magnetic powder and binder to form a magnetic 111 film provides the best dispersibility of the additive and further improves the abrasion resistance of the magnetic m film. I can do it.
本発明の磁気記録媒体は、上述したようにモース硬度６
以上で平均粒径０．１〜２１１ｍの非磁性酸化物と平均
粒径０．０５μｍ以下の非磁性酸化物とを併用して磁性
塗膜中に分散させたことにょル、非常に耐摩耗性が良好
で、その寿命を伸ばすことができるものである。As mentioned above, the magnetic recording medium of the present invention has a Mohs hardness of 6
In the above, a non-magnetic oxide with an average particle size of 0.1 to 211 m and a non-magnetic oxide with an average particle size of 0.05 μm or less are dispersed in a magnetic coating film, which is extremely wear resistant. It has good properties and can extend its lifespan.
以下、実施例と比較例を示し、本発明を更に具体的Ｋａ
明する。Examples and comparative examples will be shown below to further illustrate the present invention.
I will clarify.
〔実施例１〕
ｒ−Ｆ・、０． ３３ 重
量％ビニル樹脂 ７
可塑剤 ６
界面活性剤 ０．５ １ＣｑＯ，（平
均粒径０．２ｘｔａ） ２−ＡＢ ｚ船
り０．（平均粒径０．０３声鵬以下） ０．４５重
量−１００，０１
〔比較例１〕
ｒ −Ｆ＠、０． ３３
重量−ビニル樹脂 ７１
可塑剤 ６
界面活性剤 ０・５ ′Ｃｒｐｓ
（平均粒径０．２Ｊｍ） ３．０ １溶
剤 ５０Ｊ ＃１００．０
１
〔実施例２〕
ｙ−Ｆ＠２０ｓ ３３ １ｔ
ｌビニル樹脂 ７１
可塑剤 ６ｚ
界面活性剤 ０．５１ｔｚ、ｏ、 （
平均粒径０．５ＪＩｍ） ２．５５ ｔＡ
ｔ２０． （＃ ０．０３ｓ醜以下）０．４５１溶
剤 ５０．５ ＃１００．
０ ＃
〔比較例２〕
ｒ−ｙ・、０． ３３ 重
量−ビニル樹脂 ７′
可塑剤 ６Ｉ
界面活性剤 ０．５ｒ＆ｊ２０． （
平均粒径ｏ、ｓｐｍ） ３．０ ＃浩剤
５０．５ ＃１００．０ １
上記実施例１，２、比較例１，２に示し九組献を有する
組成物をそれぞれ２０時間−一ル建ル旭理して磁性塗料
をりくシ、これをポリエチレン７タレート基材上に塗布
か乾燥して磁気チーブを作製した。なお、使用したＣｒ
、０ｊＦｉ顔料用として市販されているもの、平均粒径
０．５μｍ Ｏｕ、Ｏ，は上材工業（株）製画品名メカ
ノ、クスＵＢ−１４１−すれぞれ用いた。ｔた、平均粒
＠０．０３ａｘｘ以下Ｃムｔ２０Ｉｌｌとしては、実施
例１で紘アル１ｍりムアンモニウムミ田つパンよシ生成
させたｒ−アル電す、実施例２ではアル建ニウムＯアン
モニウム炭酸壌よル生成させたγ−アル建すをそれぞれ
用いた。[Example 1] r-F・, 0. 33 Weight% vinyl resin 7 Plasticizer 6 Surfactant 0.5 1CqO, (average particle size 0.2xta) 2-AB z boat 0. (Average particle size 0.03 or less) 0.45 weight - 100,01 [Comparative example 1] r -F@, 0. 33
Weight - Vinyl resin 71 Plasticizer 6 Surfactant 0.5'Crps
(Average particle size 0.2Jm) 3.0 1 Solvent 50J #100.0
1 [Example 2] y-F@20s 33 1t
l Vinyl resin 71 Plasticizer 6z Surfactant 0.51tz, o, (
Average particle size 0.5 JIm) 2.55 tA
t20. (#0.03s ugly or less) 0.451 solvent 50.5 #100.
0 # [Comparative Example 2] ry・, 0. 33 Weight - Vinyl resin 7' Plasticizer 6I Surfactant 0.5r&j20. (
Average particle size o, spm) 3.0 #Hardening agent 50.5 #100.0 1 The compositions having the nine compositions shown in Examples 1 and 2 and Comparative Examples 1 and 2 above were heated for 20 hours - 1 hour, respectively. A magnetic coating was applied to the polyethylene 7-talate substrate and dried to produce a magnetic tube. In addition, the Cr used
, OjFi pigments are commercially available, and the average particle size is 0.5 μm. Ou and O are manufactured by Uezai Kogyo Co., Ltd. under the product name Meccano and Kusu UB-141-, respectively. In addition, the average grain @ 0.03axx or less Cmu t20Ill is the r-aluminium produced from 1 m of aluminum in Example 1, and the r-aluminium produced in Example 2. γ-aluminum produced from carbonic acid was used in each case.
次に、上記４種の例より得られた磁気チーｆｔ′記録再
生装置Ｋａｌ横し、送行させて出力の経時変化ｔ−ｌ４
Ｊ定した。結果を図面に示す。なお、図中ムは実施例１
の塗膜を用いた磁気チーブ、璽は比較例１１２）Ｉｋ膜
を用いた磁気チーブ、Ｃ紘実施例２の塗膜を用いた磁気
チーブ、Ｄは比較例２の塗膜を用い九磁気チー プの結
果である。Next, the magnetic head ft' recording and reproducing device Kal obtained from the above four types of examples was moved horizontally and the output change over time t-l4.
J was decided. The results are shown in the drawing. In addition, in the figure, the symbol is Embodiment 1.
Magnetic chive using the coating film of Comparative Example 112) Magnetic chive using the Ik film C, Magnetic chive using the coating film of Example 2 D: Magnetic chive using the coating film of Comparative Example 2 This is the result of the
図面より、平均粒径０．０！＄Ａ１１以下の超微粒非磁
性酸化物を添加した実施例１，２の塗膜を用いた磁気チ
ーブは、超微粒非磁性酸化物を添加していない比較例！
、２０塗膜（なお、非磁性酸化物の総使用量紘実施例、
比較例共に同じである）を用いた磁気チーブに比較して
、出力が低下するまでの時間が２倍程度伸びていること
が知見され、本発明の効果が確認された・
なお、実施例１．２において、平均粒径０．０５．＃ｌ
ｌ以下の超微粒子の非磁性酸化物の使用量を種々変化さ
せたところ、その使用量が磁性塗膜中に分散される非磁
性酸化物全体の３重量−よル少ないと磁気チーブＯ耐摩
耗性向上はめまル認められず、磁気ヘッドにおける損傷
防止効果も低下し、また３０重量−より多いと磁気へｅ
Ｖ（Ｄ損傷をかな）軽減させることはできたが、耐摩耗
性が非常に低下する傾向が見られ、従ってこの超微粒子
の非磁性酸化物の添加による特性は、非磁性酸化物重量
全体の３〜３０重量−とじ九場合に最も顕著に現われる
ことがわかった、
本発明における上述したような効果が得られる原因の一
つとしては、超微粒子を含む添加剤を使用することＫよ
り粉体の流動性が改善され、磁性塗膜中に均一な分散が
なされるということが推測される。つまシ、超微粒子の
ｒ −ｍ２ｏ、が他の粒子の表面に分散して粒子間の摩
擦を軽減したシ、再凝集を防止して込るため、上述した
ような効果が現われるものと考えられ友、なお、この超
微粒子による上述した効果は、γ−ムｔ２０１に限られ
ず、α−ｋｔ２０． Ｐ ８１０． 、 ＴｉＯ２など
の他の超微粒非磁性酸化物を用いた場合でも認めること
ができた。From the drawing, the average particle size is 0.0! The magnetic chives using the coating films of Examples 1 and 2 with the addition of ultrafine nonmagnetic oxides of $A11 or less are comparative examples without the addition of ultrafine nonmagnetic oxides!
, 20 coatings (total amount of non-magnetic oxide used)
It was found that the time required for the output to decrease was approximately twice as long as that of the magnetic chive using a magnetic tube (same in both comparative examples), confirming the effect of the present invention.Example 1 .2, the average particle size is 0.05. #l
When we varied the amount of non-magnetic oxide in the form of ultrafine particles of less than 1 liter, we found that if the amount used was less than 3 weight of the entire non-magnetic oxide dispersed in the magnetic coating, the wear resistance of Magnetic Tibe O decreased. No improvement in dizziness was observed, the effect of preventing damage to the magnetic head was reduced, and if the weight exceeded 30%, it would cause damage to the magnetic head.
Although it was possible to reduce V (D damage), there was a tendency for the wear resistance to decrease significantly, and therefore, the properties of the ultrafine particles due to the addition of non-magnetic oxide were One reason for the above-mentioned effects of the present invention is that the use of additives containing ultrafine particles is most noticeable when binding between 3 and 30% by weight. It is presumed that the fluidity of the magnetic coating is improved and uniform dispersion is achieved in the magnetic coating. It is thought that the above-mentioned effect appears because the r-m2o of the ultrafine particles is dispersed on the surface of other particles, reducing the friction between the particles and preventing reagglomeration. Friend, the above-mentioned effect of this ultrafine particle is not limited to γ-kt201, but also α-kt20. P810. , could be observed even when other ultrafine nonmagnetic oxides such as TiO2 were used.
「に磁気チーブに用いられるｒ −Ｆ＊２０ｊＯ平均粒
径は通常０．０４〜１βｍの範囲内にあｐ１前記超微粒
子を加え友添加剤の粒径の範囲が磁性粉（ｒＦ・、Ｏ５
）と同程度になることも上述した効果を発揮する一つの
要因であると考えられ九〇The average particle diameter of r-F*20jO used in magnetic powder is usually within the range of 0.04 to 1βm.
) is considered to be one of the factors contributing to the above-mentioned effect.
図面は本発明の一実施例に係る磁気記録媒体と従来の磁
気記録媒体の出力の経時変化を比較したグラフである。
出願人 上村工業株式会社
代理人 弁理士 小島１司
Ｉ 弁理士高畑端世The drawing is a graph comparing the change in output over time of a magnetic recording medium according to an embodiment of the present invention and a conventional magnetic recording medium. Applicant Uemura Kogyo Co., Ltd. Agent Patent Attorney Kazushi Kojima Patent Attorney Hanyo Takahata
Claims (1)
の非磁性酸化物と、平均粒径が０．０５μｍ以下の非磁
性酸化物とを併用して磁性塗膜に分散させてなることを
特徴とする磁気記録媒体・ Ｚ 平均粒＠Ｏ，ＯＳ胸以下の非磁性酸化物の使用量が
非磁性酸化物全体の３〜３０重量饅である特許請求の範
囲第１項記載の磁気記録媒体。 １ 平均粒径０．１〜２ ｆｉｌｌｌの非磁性酸化物の
総使用量が磁性塗膜全体の１〜１５重量−である特許請
求の範囲第１項又は＃Ｉ２項紀載Ｏ磁気記碌媒体。[Claims] 1. Mohs hardness is 6 or more and average particle size is 0.1 to 211 m.
and a non-magnetic oxide with an average particle size of 0.05 μm or less, which are dispersed in a magnetic coating film. 2. The magnetic recording medium according to claim 1, wherein the amount of the nonmagnetic oxide used is 3 to 30% by weight of the total nonmagnetic oxide. 1. A magnetic recording medium described in Claim 1 or #I2, wherein the total amount of nonmagnetic oxides with an average particle size of 0.1 to 2 fill is 1 to 15% by weight of the entire magnetic coating film. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56137444A JPS5841437A (en) | 1981-09-01 | 1981-09-01 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56137444A JPS5841437A (en) | 1981-09-01 | 1981-09-01 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5841437A true JPS5841437A (en) | 1983-03-10 |
Family
ID=15198760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56137444A Pending JPS5841437A (en) | 1981-09-01 | 1981-09-01 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5841437A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61289528A (en) * | 1985-06-17 | 1986-12-19 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS6398828A (en) * | 1986-10-16 | 1988-04-30 | Fuji Photo Film Co Ltd | Magnetic recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5099702A (en) * | 1973-12-28 | 1975-08-07 |
-
1981
- 1981-09-01 JP JP56137444A patent/JPS5841437A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5099702A (en) * | 1973-12-28 | 1975-08-07 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61289528A (en) * | 1985-06-17 | 1986-12-19 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS6398828A (en) * | 1986-10-16 | 1988-04-30 | Fuji Photo Film Co Ltd | Magnetic recording medium |
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