JPH02249126A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH02249126A JPH02249126A JP7130089A JP7130089A JPH02249126A JP H02249126 A JPH02249126 A JP H02249126A JP 7130089 A JP7130089 A JP 7130089A JP 7130089 A JP7130089 A JP 7130089A JP H02249126 A JPH02249126 A JP H02249126A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- fatty acid
- alkyl group
- coating film
- acid ester
- 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
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 15
- 229930195729 fatty acid Natural products 0.000 claims abstract description 15
- 239000000194 fatty acid Substances 0.000 claims abstract description 15
- -1 fatty acid ester Chemical class 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract 2
- 239000001257 hydrogen Substances 0.000 claims abstract 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 7
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 125000004417 unsaturated alkyl group Chemical group 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 abstract description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract 1
- 239000000314 lubricant Substances 0.000 description 16
- 150000004665 fatty acids Chemical class 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 125000002947 alkylene group Chemical group 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 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 2
- PRAKJMSDJKAYCZ-UHFFFAOYSA-N squalane Chemical compound CC(C)CCCC(C)CCCC(C)CCCCC(C)CCCC(C)CCCC(C)C PRAKJMSDJKAYCZ-UHFFFAOYSA-N 0.000 description 2
- GELKGHVAFRCJNA-UHFFFAOYSA-N 2,2-Dimethyloxirane Chemical compound CC1(C)CO1 GELKGHVAFRCJNA-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229940060037 fluorine Drugs 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- JXTPJDDICSTXJX-UHFFFAOYSA-N n-Triacontane Natural products CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC JXTPJDDICSTXJX-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 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
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000003847 radiation curing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229940032094 squalane Drugs 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
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に係わり、さらに詳しくはその潤
滑剤の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic recording media, and more particularly to improvements in lubricants thereof.
磁気記録媒体の最近の急速な小屋記録量の大容量化に伴
い、その磁性層に対して、従来以上の機械的性能の向上
、情報破壊等（以後ソフトエラーと記す）の低減が要求
されている。中でもフロッピーディスクの如き磁気ディ
スクは、その磁性層が磁気ヘッドと高速かつ高、パッド
圧で摺接するため、あるいは、ジャケット中のライナー
とりフタ一部で激しく摺接するため塗膜に傷が発生した
シ、表面や磁気ヘッドに付着してドロップアウト発生の
原因となる。特に最大線記録密度が３５ ｋｆｃｉ以上
のバリウムフェライトフロッピーディスクやメタルフロ
ッピーディスクにおいては、この傾向が顕著になる。With the recent rapid increase in the storage capacity of magnetic recording media, the magnetic layer is required to have better mechanical performance than ever before and to reduce information destruction (hereinafter referred to as soft errors). There is. Among magnetic disks such as floppy disks, the magnetic layer slides against the magnetic head at high speed and with high pad pressure, or the liner in the jacket and part of the lid slide violently, causing scratches on the coating. , it adheres to the surface or magnetic head and causes dropouts. This tendency is particularly noticeable in barium ferrite floppy disks and metal floppy disks with a maximum linear recording density of 35 kfci or more.
また、フロッピーディスクドライブの小型化によシ、ド
ライブモータが低消費電力、低トルク歴に移行している
ため、磁性層の摩擦係数が大きいと、磁気ヘッドと磁性
層が貼着したシ、回転ムラが生じ信頼性が低下するとい
った問題も発生する。In addition, as floppy disk drives become smaller, drive motors are moving to lower power consumption and lower torque. Problems such as unevenness and decreased reliability also occur.
こういった諸問題の解決策として、従来は、バインダや
固形添加剤の改良によシ、磁性層の塗膜強度を向上させ
たり、潤滑剤の改良によ）１１４清性能を向上させたシ
するなどの検討がなされてきた。Conventionally, solutions to these problems have been to improve the 114 performance (by improving the binder and solid additives, increasing the coating strength of the magnetic layer, and improving the lubricant). Considerations have been made to do so.
特に潤滑剤に関しては、その効果が比較的大きく、高級
脂肪酸、高級脂肪酸エステル、流動パラフィン、スクア
ラン、フッ素系化合物やシリコーン系化合物などが従来
から用いられてきた。しかしながら、バリウムフェライ
トフロッピーディスクやメタルフロッピーディスク等の
小型大記録容量磁気記録媒体の耐久性、信頼性を満足さ
せるには、従来公知の上記潤滑剤では十分と言えず、特
に低温環境下でソフトエラーが発生しやすくその、対策
が要求されている。In particular, lubricants have relatively large effects, and higher fatty acids, higher fatty acid esters, liquid paraffin, squalane, fluorine-based compounds, silicone-based compounds, and the like have traditionally been used. However, to satisfy the durability and reliability of small-sized, large-capacity magnetic recording media such as barium ferrite floppy disks and metal floppy disks, the above-mentioned conventional lubricants are not sufficient, and soft errors occur especially in low-temperature environments. This is likely to occur and countermeasures are required.
この発明は従来の潤滑剤性能の欠点を解決し、以って信
頼性、耐久性に優れた磁気記録媒体を提供することを目
的とする。The object of the present invention is to solve the drawbacks of conventional lubricant performance and thereby provide a magnetic recording medium with excellent reliability and durability.
本発明者らは、低温環境下において、ソフトエラーが発
生しやすくなる原因について研究した。The present inventors studied the causes of soft errors being more likely to occur in a low-temperature environment.
低温においては潤滑剤の流動性が悪くなり粘稠となるた
め、潤滑性能が低下することを見出した。It has been found that at low temperatures, the fluidity of the lubricant deteriorates and it becomes viscous, resulting in a decrease in lubrication performance.
上記結果をもとに、種々の潤滑剤について検討したとこ
ろ、分岐アルコールに低級アルキレンオキサイドを付加
させた誘導体と脂肪酸中でも不飽和脂肪酸とのエステル
化合物が融点が低く、低温においても流動性が良く、良
好な潤滑性能を有することを見い出し、本発明をなすに
至った。Based on the above results, we investigated various lubricants and found that an ester compound of a derivative obtained by adding a lower alkylene oxide to a branched alcohol and an unsaturated fatty acid among fatty acids has a low melting point and good fluidity even at low temperatures. It was discovered that it has good lubrication performance, and the present invention was completed.
かかる脂肪酸エステルは一般式（１）で示される構造式
を有する。Such fatty acid ester has a structural formula represented by general formula (1).
（式中、Ｒｌｅ Ｒ２は各々炭素数゛１〜２５の直鎖ま
たは分岐を有する飽和または不飽和アルキル基で、Ｒ１
とＲ２の炭素数の和が６〜３４、Ｒ３は水素またはアル
キル基、也は炭素数７〜２９の直鎖またけ分岐を有する
飽和または不飽和アルキル基、ｎは１ｚ４の整数、ｍは
１〜１０の整数である。）かかる脂肪酸エステルは、炭
素数が８以上の分岐アルコールにエチレオキサイド、プ
ロピレンオキサイド、イソブチレンオキサイドやポリオ
キシメチレン等の低級アルキレンオキサイドを付加させ
た分岐アルコール誘導体と、炭素数が８〜３゜の脂肪酸
とのエステル化反応によって得ることができる。(In the formula, Rle R2 is a linear or branched saturated or unsaturated alkyl group having 1 to 25 carbon atoms, and R1
The sum of the carbon numbers of It is an integer between ~10. ) Such fatty acid esters include branched alcohol derivatives obtained by adding lower alkylene oxides such as ethylene oxide, propylene oxide, isobutylene oxide, and polyoxymethylene to branched alcohols having 8 or more carbon atoms, and fatty acids having 8 to 3 carbon atoms. It can be obtained by an esterification reaction with.
前記エステル化合物において、Ｒ１ｓ Ｒ２ｙ ＲＢオ
よびＲ４のアルキル基は、直鎖、分岐、飽和、不飽和の
いずれであってもよい。しかしＲ４は、炭素数７〜２９
の不飽和アルキル基である場合、特に良好な潤滑剤とな
る。また、低級アルキレンオキサイドの付加モル数ｍに
ついては１〜５のものが好ましい。In the ester compound, the alkyl groups of R1s R2y RB and R4 may be linear, branched, saturated, or unsaturated. However, R4 has 7 to 29 carbon atoms.
When it is an unsaturated alkyl group, it becomes a particularly good lubricant. Further, the number m of added moles of lower alkylene oxide is preferably 1 to 5.
本発明の脂肪酸エステルはあらかじめ磁性塗料中に添加
しておくか、トルエフ、 ｎ−ヘキサンなどの溶剤に
溶解させて、磁性塗膜中に含浸させる方法によって磁性
層中に含ませる。The fatty acid ester of the present invention is incorporated into the magnetic layer by adding it in advance to the magnetic coating or by dissolving it in a solvent such as Toluev or n-hexane and impregnating it into the magnetic coating.
また、本発明の脂肪酸ニスチルは従来公知の潤滑剤と併
用しても差しつかえない。この場合、本発明の脂肪酸エ
ステルは、全使用潤滑量の１０ ｗｔ１以上使用する必
要がある。これ以下の比率になると、低温での潤滑性が
良くならない。Furthermore, the fatty acid nystyl of the present invention may be used in combination with conventionally known lubricants. In this case, the fatty acid ester of the present invention needs to be used in an amount of 10 wt1 or more of the total amount of lubricant used. If the ratio is lower than this, the lubricity at low temperatures will not improve.
本発明に係る磁気記録媒体に用いる、非磁性可撓性支持
体、磁性粉、結合剤および溶剤等は、従来公知のものが
いずれも使用可能である。As the non-magnetic flexible support, magnetic powder, binder, solvent, etc. used in the magnetic recording medium according to the present invention, any conventionally known ones can be used.
磁性層を形成するには、磁性粉および結合剤等を適当な
溶剤を用いて分散混合機にて塗料化して磁性塗料を調製
し、この塗料を非磁性支持体上に塗布、乾燥、必要に応
じて熱硬化あるいは放射線硬化させればよい。To form a magnetic layer, prepare a magnetic paint by mixing magnetic powder, a binder, etc. with a suitable solvent using a dispersion mixer, apply this paint onto a non-magnetic support, dry it, and apply as necessary. Depending on the situation, heat curing or radiation curing may be performed.
潤滑剤は磁性塗料製造時に所要量添加するか、磁性層形
成後含浸させて磁性層中に含有させる。The lubricant is added in a required amount during the production of the magnetic paint, or is impregnated into the magnetic layer after the magnetic layer is formed.
また上記塗料中には通常使用されている各種添加剤たと
えば、分散剤、研磨剤、帯電防止剤などを適宜配合して
もよい。Further, various commonly used additives such as dispersants, abrasives, antistatic agents, etc. may be appropriately blended into the above-mentioned coating material.
以下、この発明の実施例を比較例と対比して説明する。 Examples of the present invention will be described below in comparison with comparative examples.
なお、以下において部とあるのは重量部を意味する。In addition, in the following, parts mean parts by weight.
実施例１〜５
表１に示す脂肪酸エステルを用い、下記組成からなる磁
性塗料全調製し、これを厚さ７５μｍのポリエステルフ
ィルムの両面に乾燥後の厚みが２．５μｍとなるように
塗布し、乾燥したのち、カレンダリング処理を施して磁
性層を形成した。次いで、これを８０°Ｃにて、１６時
間熱キユアした後、円板状に打ち抜き研磨して磁気ディ
スクを作製した。Examples 1 to 5 Using the fatty acid esters shown in Table 1, a magnetic paint having the following composition was prepared, and this was applied to both sides of a 75 μm thick polyester film so that the thickness after drying was 2.5 μm. After drying, a magnetic layer was formed by calendering. Next, this was heat cured at 80° C. for 16 hours, and then punched and polished into a disk shape to produce a magnetic disk.
金属鉄磁性粉（平均長軸径０．３０μｍ １００部平均
軸比８ ８ＢＥＴ＝ ４０扉／ｆ
Ｈｅ ＝１６５００ｅ＃ ａｓ ＝１３０ｅｍｕ／ｆ
）塩ピー酢ビービニルアルコール共重合体１４部（ＵＣ
Ｃ社製、ＶＡＧＨ）
ポリウレタン樹脂（三菱化成社製、 ９〃ＭＥ６
６４）
ポリイソシアネート化合物（日本ポリ ６〃ウレタン
社製、コロネートＬ）
ａ Ａ！’２０３ （平均粒径、０．４７’ｌ
２０／／カーボンブラツク ２〃
潤滑剤（表１に示す） １０〃トルエン
１５０〃シクロヘキサノ
ン １５０〃比較例１〜３
実施例で用いた潤滑剤に代え、表２に示した潤滑剤を同
量用いた以外は実施例と同様にして磁気ディスクを作製
した。Metallic iron magnetic powder (average long axis diameter 0.30μm 100 copies average axial ratio 8 8BET = 40 doors/f He = 16500e# as = 130emu/f
) Salt, pea vinegar, vinyl alcohol copolymer 14 parts (UC
Manufactured by Company C, VAGH) Polyurethane resin (manufactured by Mitsubishi Kasei Corporation, 9〃ME6
64) Polyisocyanate compound (manufactured by Nippon Poly 6 Urethane Co., Ltd., Coronate L) a A! '203 (average particle size, 0.47'l
20//Carbon black 2
Lubricant (shown in Table 1) 10〃Toluene 150〃Cyclohexanone 150〃Comparative Examples 1 to 3 Same as in Example except that the lubricant shown in Table 2 was used in the same amount instead of the lubricant used in Example. A magnetic disk was manufactured using the following steps.
上記実施例、および比較例で得た各磁気ディスクについ
て、耐久性、・起動トルク、ンフトエラー発生確率を温
度を変えて測定した。For each of the magnetic disks obtained in the above examples and comparative examples, the durability, starting torque, and probability of occurrence of a foot error were measured at different temperatures.
耐久性は磁気ディスクを３．５インチフロッピーディス
クドライブに装填し０°Ｃ１および５０°Ｃにおいて、
ディスクを磁気ヘッドに摺接させながら、磁性層の摩耗
による再生出力レベルが、初期出力の７０％に低下する
までの走行バス回数で示した。Durability is measured by loading a magnetic disk into a 3.5-inch floppy disk drive at 0°C and 50°C.
It is expressed as the number of bus runs until the reproduction output level drops to 70% of the initial output due to wear of the magnetic layer while the disk is in sliding contact with the magnetic head.
起動トルクは、３．５インチフロッピーディスクドライ
ブを改良した測定装置によシ０°Ｃ１５０°Ｃにて１時
間走行後の値を測定した。The starting torque was measured after running for 1 hour at 0°C and 150°C using a measuring device modified from a 3.5-inch floppy disk drive.
ソフトエラー試験は、ギャップ長０．３５μｍのセンダ
ストアモルファス磁気ヘッドを用いてサーテイフアイ（
ただし最大線記録密度３５ｋｆｃｉ）を行い、ドロップ
アウトのないことを確認した後に、０℃、５０℃におい
て２時間シークを行い、ソフトエラー発生のチエツクを
行った。The soft error test was carried out using a certify (
However, after confirming that there was no dropout at a maximum linear recording density of 35 kfci, seek was performed at 0° C. and 50° C. for 2 hours to check for soft errors.
以上説明したように、本発明にもとづく脂肪酸エステル
を潤滑剤として用いた磁気記録媒体は、従来の潤滑剤を
用いた磁気記録媒体に比し、低温でのソフトエラー発生
率が著しく減少し、また、優れた耐久信頼性を有するこ
とがあきらかである。As explained above, the magnetic recording medium using a fatty acid ester as a lubricant according to the present invention has a significantly lower soft error occurrence rate at low temperatures than a magnetic recording medium using a conventional lubricant. , it is clear that it has excellent durability and reliability.
Claims (1)
合剤とを含む磁性塗膜を設けてなる磁気記録媒体におい
て、前記磁性塗膜中に下記一般式（１）で表わされる脂
肪酸エステルを含有することを特徴とする磁気記録媒体
。 ▲数式、化学式、表等があります▼（１） （式中、Ｒ＿１、Ｒ＿２は各々炭素数１〜２５の直鎖ま
たは分岐を有する飽和または不飽和アルキル基で、Ｒ＿
１とＲ＿２の炭素数の和が６〜３４、Ｒ＿３は水素また
はアルキル基、Ｒ＿４は炭素数７〜２９の直鎖または分
岐を有する飽和または不飽和アルキル基、ｎは１〜４の
整数、ｍは１〜１０の整数である。）（２）請求項（１
）記載の脂肪酸エステルで、Ｒ＿４が炭素数７〜２９の
不飽和アルキル基で、ｍが１〜５で表わされる脂肪酸エ
ステルを含有することを特徴とする磁気記録媒体。(1) In a magnetic recording medium in which a magnetic coating film containing magnetic powder and a binder for binding the magnetic powder is provided on a non-magnetic support, the magnetic coating film is represented by the following general formula (1). A magnetic recording medium characterized by containing a fatty acid ester. ▲There are mathematical formulas, chemical formulas, tables, etc.▼(1) (In the formula, R_1 and R_2 are each a linear or branched saturated or unsaturated alkyl group having 1 to 25 carbon atoms, and R_
The sum of the carbon numbers of 1 and R_2 is 6 to 34, R_3 is hydrogen or an alkyl group, R_4 is a linear or branched saturated or unsaturated alkyl group having 7 to 29 carbon atoms, n is an integer of 1 to 4, m is an integer from 1 to 10. ) (2) Claim (1)
), wherein R_4 is an unsaturated alkyl group having 7 to 29 carbon atoms, and m is 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7130089A JPH02249126A (en) | 1989-03-23 | 1989-03-23 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7130089A JPH02249126A (en) | 1989-03-23 | 1989-03-23 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02249126A true JPH02249126A (en) | 1990-10-04 |
Family
ID=13456669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7130089A Pending JPH02249126A (en) | 1989-03-23 | 1989-03-23 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02249126A (en) |
-
1989
- 1989-03-23 JP JP7130089A patent/JPH02249126A/en active Pending
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