JPS63133317A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS63133317A JPS63133317A JP61278773A JP27877386A JPS63133317A JP S63133317 A JPS63133317 A JP S63133317A JP 61278773 A JP61278773 A JP 61278773A JP 27877386 A JP27877386 A JP 27877386A JP S63133317 A JPS63133317 A JP S63133317A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic powder
- recording medium
- general formula
- compound represented
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 48
- 125000001183 hydrocarbyl group Chemical group 0.000 claims abstract description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 3
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 30
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims 1
- 239000006247 magnetic powder Substances 0.000 abstract description 39
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract 2
- 238000005189 flocculation Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000000787 lecithin Substances 0.000 description 4
- 229940067606 lecithin Drugs 0.000 description 4
- 235000010445 lecithin Nutrition 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- -1 methyl ethyl Chemical group 0.000 description 3
- 239000011882 ultra-fine particle Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- WRKCIHRWQZQBOL-UHFFFAOYSA-N octyl dihydrogen phosphate Chemical compound CCCCCCCCOP(O)(O)=O WRKCIHRWQZQBOL-UHFFFAOYSA-N 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 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 1
- 239000003973 paint Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
Abstract
Description
本発明は、例えばビデオ用、オーディオ用、コンピュー
タ用の磁気テープ又は磁気ディスク等の磁気記録媒体に
関するものである。The present invention relates to a magnetic recording medium such as a magnetic tape or a magnetic disk for use in video, audio, and computers.
８１ビデオ用あるいはデジタルオーディオ用の磁気テー
プにおいては、金属磁性粉又は合金磁性粉のようなメタ
ル磁性粉が用いられるようになっている。
このようなメタル磁性粉を用いる場合にあっては、一層
の高Ｓ／Ｎを図る為にメタル磁性粉を超微粒子化するこ
とが求められている。
すなわち、メタル磁性粉を超微粒子化することによって
ノイズの低下を図ろうとしているのであるが、このよう
に超微粒子化すると磁性粉が′ａ集しやすくなり、磁性
粉の分散性が低下し、結果的には電磁変換特性が低下し
てしまうのである。
そこで、磁性粉の分散性を高める為に分散剤が用いられ
るわけであるが、酸化物系磁性粉に用いられてきた従来
の分散剤、あるいはメタル磁性粉に用いられてきた分散
剤であってもこれまでの分散剤では、超微粒子化したメ
タル磁性粉の高い分散性を得ることは出来なかった。
例えば、特開昭５０−４０１０３号公報、特開昭５２−
７７０４号公報、特開昭５８−２３３２４号公報で提案
されてきたようなアルキルリン酸エステル、あるいはレ
シチン、特開昭５１−１３０２０２号公報で提案されて
きたようなＲＣＯＮ（Ｃ１１，）ＣＨ２Ｃ００Ｘ、又は
特開昭５８−１１８０３１号公報で提案されてきたよう
なＲＣＯＮ（ＣＩｌｚ）ＣＩｌｚＣＯＯＨでは、超微粒
子化したメタル磁性粉を充分に分散させられなかったの
である。In magnetic tapes for .81 video or digital audio, metal magnetic powder such as metal magnetic powder or alloy magnetic powder is used. When using such metal magnetic powder, it is required to make the metal magnetic powder into ultrafine particles in order to achieve an even higher S/N ratio. In other words, attempts are being made to reduce noise by making the metal magnetic powder into ultra-fine particles, but making the metal magnetic powder into ultra-fine particles makes it easier for the magnetic powder to aggregate, reducing the dispersibility of the magnetic powder. As a result, the electromagnetic conversion characteristics deteriorate. Therefore, a dispersant is used to improve the dispersibility of magnetic powder, but it is not the conventional dispersant that has been used for oxide magnetic powder or the dispersant that has been used for metal magnetic powder. However, with conventional dispersants, it has not been possible to obtain high dispersibility of ultrafine metal magnetic powder. For example, JP-A-50-40103, JP-A-52-
Alkyl phosphate ester or lecithin as proposed in JP-A No. 7704 and JP-A-58-23324, RCON(C11,)CH2C00X as proposed in JP-A-51-130202, or RCON(CIlz)CIlzCOOH as proposed in JP-A-58-118031 could not sufficiently disperse ultrafine metal magnetic powder.
本発明者は、磁性粉の分散性を良くする分散剤について
の研究を鋭意押し進めた結果、下記の一般式［Ａ］で示
される化合物は磁性粉の分散効果に極めて優れており、
例えば酸化鉄のような酸化物系の磁性粉を用いた磁気記
録媒体の場合には高域の出力が向上するようになり、又
、メタル磁性粉を用いた磁気記録媒体の場合には高Ｓ／
Ｎ化を図ることができ、さらには磁性層の耐久性が向上
することを見出したのである。
Ｒ，ＣＯＮ→ＣＨ廿ｒＳ○３Ｍ ［Ａ］□
但し、この一般式［Ａ］で表わされる化合物において、
Ｒ１の炭素数が多すぎる場合又は逆に少なすぎる場合、
又、Ｒ２の炭素数が多すぎる場合、又、■が大きすぎる
場合には、分散効果が小さいことから、Ｒ，は炭素数が
１１〜１７の飽和又は不飽和の炭化水素基、Ｒ２は炭素
数が１〜４の飽和又は不飽和の炭化水素基であって、又
、ｎは１〜４の整数であることが大事である。
又、一般式［Ａ］中、Ｍは例えばＮａ等のアルカリ金属
原子である。
すなわち、一般式［Ａ］で表わされる化合物が、例えば
酸化鉄あるいはコバルト含有酸化鉄のような酸化物系の
磁性粉、合金鉄のようなメタル磁性粉、又はバリウムフ
ェライト磁性粉等の磁性粉を含む磁性塗料中に添加され
ていると、−服代［Ａ］中の一５０２Ｍ基が磁性粉の表
面に吸着し、あたかも磁性粉の表面が一般式［Ａ］の化
合物による単分子膜で外側に炭化水素基が位置するよう
に被覆されたような構造になり、従って磁性粉はバイン
ダとのなじみが良好となるから磁性粉はバインダ中に均
一に分散されるようになるのである。
そして、磁性粉の分散性が向上することから、再生出力
の向上がもたらされ、又、磁性層表面の平滑性が良くな
るのでノイズは小さくなり、又、磁性粉の充填性が向上
するから電磁変換特性は向上し、さらには塗膜の欠落等
に対する耐久性も向上するようになる。
尚、上記のような磁性粉に対して一般式［Ａ］で表わさ
れる化合物を約０．５〜５重皿％所定の溶剤中に添加混
合し、あらかじめこの一般式［Ａ］で表わされる化合物
を磁性粉に吸着処理するようにしておくと望ましいもの
になる。As a result of intensive research into dispersants that improve the dispersibility of magnetic powder, the present inventor found that a compound represented by the following general formula [A] has an extremely excellent dispersion effect for magnetic powder.
For example, in the case of a magnetic recording medium that uses oxide-based magnetic powder such as iron oxide, the output in the high range improves, and in the case of a magnetic recording medium that uses metal magnetic powder, the S /
They discovered that it is possible to increase the nitrogen content and further improve the durability of the magnetic layer. R,CON→CH廿rS○3M [A]□ However, in the compound represented by this general formula [A],
If the number of carbon atoms in R1 is too large or conversely too small,
In addition, if the number of carbon atoms in R2 is too large or if ■ is too large, the dispersion effect will be small. It is important that the number is 1 to 4 saturated or unsaturated hydrocarbon groups, and n is an integer of 1 to 4. Further, in the general formula [A], M is an alkali metal atom such as Na. That is, the compound represented by the general formula [A] is a magnetic powder such as an oxide-based magnetic powder such as iron oxide or cobalt-containing iron oxide, a metal magnetic powder such as a ferroalloy, or a barium ferrite magnetic powder. When added to the magnetic paint containing the compound, the 1502M group in [A] is adsorbed to the surface of the magnetic powder, as if the surface of the magnetic powder was coated with a monomolecular film of the compound of general formula [A] on the outside. The structure is such that the magnetic powder is coated so that the hydrocarbon groups are located in the binder, and therefore the magnetic powder has good compatibility with the binder, so that the magnetic powder can be uniformly dispersed in the binder. Since the dispersibility of the magnetic powder is improved, the reproduction output is improved, and the smoothness of the surface of the magnetic layer is improved, which reduces noise, and the filling properties of the magnetic powder are improved. The electromagnetic conversion characteristics are improved, and the durability against chipping of the coating film is also improved. In addition, about 0.5 to 5% of the compound represented by the general formula [A] is added and mixed in a predetermined solvent to the magnetic powder as described above, and the compound represented by the general formula [A] is mixed in advance. It is desirable to adsorb it to magnetic powder.
【実施例１】
Ｃｏ古有７−Ｆｅ２０ｔ １００重ＩＩ、 Ｒ，＝ｃ、
、ｕ、、、Ｒ２＝ＣＩＩ、、ｎ＝１、Ｍ＝Ｎａの上記一
般式［Ａ］で表わされる化合物１重量部、トルエン、メ
チルエチルゲトン及びメチルイソブチルケトンの混合溶
剤３００重１部を混合撹拌し、一般式［Ａ］で表わされ
る化合物をＣｏ含含有−Ｆｅ２０３に吸着させた後、こ
れにＶ八［１，Ｈ（米１ｌｉＩＵｃｃ社製の塩化ビニル
−酢酸ビニル−ビニルアルコール共重合体）１０重量部
、８２３０４（日本ポリウレタン工業製のポリウレタン
エラストマー）２０重量部、酸化アルミニウム２ｆｆｉ
量部を添加して充分に混合分散し、そしてさらにオレイ
ン酸を１重量部加えて混合分散し、このようにして得た
磁性塗料をポリエステルフィルム等の非磁性支持体上に
塗布し、乾燥後カレンダー処理等の通常の工程を経て磁
気テープ等の磁気記録媒体を得る。[Example 1] Co old 7-Fe20t 100 heavy II, R, = c,
, u, , R2 = CII, , n = 1, M = Na, 1 part by weight of the compound represented by the above general formula [A], and 300 parts by weight of a mixed solvent of toluene, methyl ethyl getone and methyl isobutyl ketone were mixed. After stirring and adsorbing the compound represented by the general formula [A] on the Co-containing -Fe203, V8[1,H (vinyl chloride-vinyl acetate-vinyl alcohol copolymer manufactured by 1liIUcc, USA) was added to this. 10 parts by weight, 20 parts by weight of 82304 (polyurethane elastomer manufactured by Nippon Polyurethane Industries), 2ffi of aluminum oxide
1 part by weight and thoroughly mixed and dispersed, and further added 1 part by weight of oleic acid and mixed and dispersed. A magnetic recording medium such as a magnetic tape is obtained through normal processes such as calendering.
【実施例２１
実施例１において、Ｒ，＝Ｃ，、Ｒ３，、Ｒ２＝Ｃ，Ｈ
ｌ、ｎ・１、Ｍ＝Ｎａの上記一般式［Ａ、］で表わされ
る化合物を用いて同様に行ない、磁気記録媒体を得る。
【実施例３】
実施例１において、Ｒ１・Ｃ１，Ｒ０１、Ｒ２＝ＣＩ＋
、、ｎ−４、Ｍ−Ｎａの上記一般式［Ａ］で表わされる
化合物を用いて同様に行ない、磁気記録媒体を得る。[Example 21 In Example 1, R,=C,,R3,,R2=C,H
A magnetic recording medium is obtained by carrying out the same procedure using a compound represented by the above general formula [A,] where 1, n·1, and M=Na. [Example 3] In Example 1, R1・C1, R01, R2=CI+
A magnetic recording medium is obtained by carrying out the same procedure using a compound represented by the above general formula [A] of , , n-4, M-Na.
【実施例４】
実施例１において、Ｒ＋”Ｃ１□ｌｌ１．、Ｒ，＝Ｃ，
１１，、ｎ−４、Ｍ−Ｎａの上記一般式［Ａ］で表わさ
れる化合物を用いて同様に行ない、磁気記録媒体を得る
。[Example 4] In Example 1, R+”C1□ll1., R,=C,
A magnetic recording medium is obtained by carrying out the same procedure using a compound represented by the above general formula [A] of 11,, n-4, M-Na.
【実施例５】
実施例１において、Ｒ，＝Ｃ，，１１２３、Ｉｔ２＝Ｃ
Ｉ＋、、ｎ□１、闘・Ｎａの上記一般式［Ａ］で表わさ
れるｆヒ合物を用いて同様に行ない、磁気記録媒体を得
る。[Example 5] In Example 1, R,=C,,1123, It2=C
A magnetic recording medium is obtained by carrying out the same procedure using the compound represented by the above general formula [A] of I+, n□1, and Na.
【実施例６］
実施例１において、 Ｒ１”Ｃ１１Ｈ２３、Ｒ２” Ｃ
４ＩＩ Ｉ、ｎ−４、Ｍ＝Ｎａの上記一般式［Ａ］で表
わされる化合物を用いて同様に行ない、磁気記録媒体を
得る。
ｒ実施例７】
実施例１において、磁性粉としてＣｏ含含有−ＦｅｚＯ
−の代りに鉄元素を主成分とする強磁性粉を用いて一最
式［Ａ］で表わされる化合物をこの強磁性粉に吸着させ
た後、実施例１と同様なバインダ及び酸化アルミニウム
を加えて混合分散し、そしてこれにステアリン酸ブチル
１重量部、オクチルリン酸エステル１重量部、及びポリ
イソシアネート１０重量部を加えて混合分散し、このよ
うにして得た磁性塗料をポリエステルフィルム等の非磁
性支持体上に塗布し、乾燥後カレンダー処理及び加熱硬
化処理等通常の工程を経て磁気テープ等の磁気記録媒体
を得る。[Example 6] In Example 1, R1"C11H23, R2"C
4III A magnetic recording medium is obtained by carrying out the same procedure using a compound represented by the above general formula [A] in which I, n-4, M=Na. r Example 7 In Example 1, Co-containing -FezO was used as the magnetic powder.
- Instead of -, a ferromagnetic powder containing iron as a main component is used, and the compound represented by formula [A] is adsorbed onto this ferromagnetic powder, and then the same binder and aluminum oxide as in Example 1 are added. Then, 1 part by weight of butyl stearate, 1 part by weight of octyl phosphate, and 10 parts by weight of polyisocyanate were added and mixed and dispersed. It is coated onto a magnetic support, dried, and then subjected to usual steps such as calendaring and heat curing to obtain a magnetic recording medium such as a magnetic tape.
【実施例８】
実施例７において、Ｒ＋”Ｃ＋ｔＨｉｚ、Ｒ２”Ｃ１１
１１、ｎ＝１、阿・Ｎａの上記一般式［Ａ］で表わされ
る化合物を用いて同様に行ない、磁気記録媒体を得る。[Example 8] In Example 7, R+"C+tHiz, R2"C11
A magnetic recording medium is obtained by carrying out the same procedure using a compound represented by the above general formula [A] with n=1 and A/Na.
【実施例９】
実施例７において、 Ｒ＋”Ｃ１ｔｌｌ＊ｚ、Ｒ２”Ｃ
Ｈ−１ｎ＝４、Ｍ＝Ｎａの上記一般式［Ａ］で表わされ
る化合物を用いて同様に行ない、磁気記録媒体を得る。[Example 9] In Example 7, R+”C1tll*z, R2”C
A magnetic recording medium is obtained by carrying out the same procedure using a compound represented by the above general formula [A] in which H-1n=4 and M=Na.
【実施例１０１
実施例７において、 Ｒ１□Ｃ１ＩＩｔ３、Ｒ２＝ Ｃ
、Ｈ，、ｎ・４、Ｈ＝Ｎａの上記一般式［Ａ］で表わさ
れる化合物を用いて同様に行ない、磁気記録媒体を得る
。
【比較例１】
実施例１において、一般式［Ａ］で表わされる化合物の
代りにＣ，、ＩＩ、３３ＣＯＮ（ＣＨ３）ＣＲ２ＣＯＯ
Ｉ＋を用いて同様に行ない、磁気記録媒体を得る。[Example 101 In Example 7, R1□C1IIt3, R2=C
A magnetic recording medium is obtained in the same manner using a compound represented by the above general formula [A] of , H, , n·4, H=Na. [Comparative Example 1] In Example 1, C,, II, 33CON(CH3)CR2COO was used instead of the compound represented by the general formula [A].
A magnetic recording medium is obtained by carrying out the same procedure using I+.
【比較例２】
実施例１において、−ａ式［Ａ］で表わされる化合物の
代りにＣ１ｔ１１．３ＣＯＮ（ＣＬ）ＣＯＯＮａを用い
て同様に行ない、磁気記録媒体を得る。Comparative Example 2 The same procedure as in Example 1 was carried out using C1t11.3CON(CL)COONa instead of the compound represented by the -a formula [A] to obtain a magnetic recording medium.
【比較例３】
実施例１において、一般式［Ａ］で表わされる化合物の
代りにＧ Ａ Ｆ Ａ ＣＲＥ ６１０（東邦化学工業
（株）製のノニルフェニルエチレンオキシドホスフェー
ト）を用いて同様に行ない、磁気記録媒体を得る。[Comparative Example 3] The same procedure as in Example 1 was carried out using G A F A CRE 610 (nonylphenyl ethylene oxide phosphate manufactured by Toho Chemical Co., Ltd.) in place of the compound represented by the general formula [A], and magnetic Obtain a recording medium.
【比較例４】
実施例１において、一般式［Ａ］で表わされる化合物の
代りにレシチンを用いて同様に行ない、磁気記録媒体を
得る。Comparative Example 4 A magnetic recording medium was obtained by carrying out the same procedure as in Example 1 using lecithin instead of the compound represented by the general formula [A].
【比較例５】
実施例７において、一般式［Ａ］で表わされる化合物の
代りに０１□Ｉ！、、Ｃ０Ｎ（Ｃ１１，）Ｃ１ｌ、Ｃ０
０Ｉ＋を用いて同様に行ない、磁気記録媒体を得る。
ｒ比較例６】
実施例７において、一般式［Ａ］で表わされる化合物の
代りにｃ、、Ｉｆ、、Ｃ０Ｎ（Ｃ１ｌ、）ＣＩｌ□ＣＯ
ＯＮａを用いて同様に行ない、磁気記録媒体を得る。[Comparative Example 5] In Example 7, 01□I! was used instead of the compound represented by the general formula [A]. ,,C0N(C11,)C1l,C0
A magnetic recording medium is obtained in the same manner using 0I+. r Comparative Example 6 In Example 7, c,,If,,C0N(C1l,)CIl□CO instead of the compound represented by the general formula [A]
A magnetic recording medium is obtained in the same manner using ONa.
【比較例７】
実施例７において、一般式［Ａ］で表わされる化合物の
代りにＧ Ａ Ｆ Ａ ＣＲＥ ６１０を用いて同様に
行ない、磁気記録媒体を得る。Comparative Example 7 The same procedure as in Example 7 was carried out using G A F A CRE 610 instead of the compound represented by the general formula [A] to obtain a magnetic recording medium.
【比較例８】
実施例７において、一般式［Ａ］で表わされる化金物の
代りにレシチンを用いて同様に行ない、磁気記録媒体を
得る。
ｒ特性】
上記実施例１〜６及び比較例１〜４で得た磁気記録媒体
について、その保磁力ｔｌｃ、飽和磁束密度Ｂｍ、角型
比Ｒｓ、３１５１１ｚにおけるＭＯＬ及び１０ＫＨｚに
おけるＳＱＬを調べたので、その結果を表１に示す。
又、上記実施例７〜（Ｏ及び比較例５〜８で得た磁気記
録媒体について、その光沢度、表面■度、Ｓ／Ｎ及び室
温においての耐スチル時間を調べたので、その結果を表
２に示す。
表２
１）光沢度：分散終了時４５°反射
２） Ｓ／Ｎ：ＩＩＲ−２２００（日本ビクター製）に
トラック中２０μｍ、ギャップ０．２６μ爺のヘッドを
付は測定、当社基準テープ比（ｄＢ）で表示
この表１によれば、一般式［Ａ］で表わされる化合物が
用いられた場合には、Ｂｍが高く、磁性粉の分散性は一
段と良くなっており、又、角型比は大巾に向上しており
、又、高周波帯域での出力も大巾に向上していることが
わかる。
又、表２によれば、一般式［Ａ］で表わされる化合物が
用いられた場合には、光沢度が大巾に向上しており、磁
性粉の分散性は一段と良くなっており、又、Ｓ／Ｎも一
段と向上しており、さらにはスチルライフが格段に長く
なっており、磁性層の耐久性が大巾に改善されているこ
とがわかる。
すなわち、一般式［Ａ］で表わされる化合物と、従来か
らのＲＣＯＮ （ＣＨ３）Ｃｌ ２ＣＯＯＮａ 、ＲＣ
ＯＮ （ＣＨ、）ＣＨ、Ｃ００ＩＩ、アルキルリン酸エ
ステル、あるいはレシチン等の分散剤に比べれば、その
分散能力は大巾に優れていることが窺えるのである。Comparative Example 8 The same procedure as in Example 7 was carried out using lecithin instead of the metal compound represented by the general formula [A] to obtain a magnetic recording medium. r characteristics] Regarding the magnetic recording media obtained in Examples 1 to 6 and Comparative Examples 1 to 4, the coercive force tlc, saturation magnetic flux density Bm, squareness ratio Rs, MOL at 31511z and SQL at 10KHz were investigated. The results are shown in Table 1. In addition, the glossiness, surface density, S/N, and still resistance time at room temperature were investigated for the magnetic recording media obtained in Examples 7 to (O) and Comparative Examples 5 to 8, and the results are shown below. It is shown in Table 2. Table 2 1) Glossiness: 45° reflection at the end of dispersion 2) S/N: Measured using IIR-2200 (manufactured by Victor Japan) with a head with a track length of 20 μm and a gap of 0.26 μm, according to our standards. Expressed in tape ratio (dB) According to Table 1, when the compound represented by the general formula [A] is used, Bm is high, the dispersibility of the magnetic powder is even better, and the angle It can be seen that the type ratio has been greatly improved, and the output in the high frequency band has also been greatly improved. Also, according to Table 2, when the compound represented by the general formula [A] was used, the gloss was greatly improved, the dispersibility of the magnetic powder was further improved, and It can be seen that the S/N ratio has further improved, and the still life has become much longer, indicating that the durability of the magnetic layer has been greatly improved. That is, the compound represented by the general formula [A] and the conventional RCON (CH3)Cl 2COONa, RC
When compared with dispersants such as ON (CH, )CH, C00II, alkyl phosphate esters, or lecithin, it can be seen that its dispersion ability is far superior.
本発明に係る磁気記録媒体は、磁性層中に一般式［Ａ］
で表わされる化合物を含むので、この磁気記録媒体にお
ける磁性粉の分散性が良く、特に例えば微粒子化した為
に凝集が起きやすいような磁性粉にあっても磁性粉の分
散性が良く、磁性層の表面平滑性は良く、飽和磁束密度
、角型比、再生出力及びノイズ等の磁気特性及び電磁変
換特性が向上するようになり、又、スチルライフの大［
［１な向上が得られる等磁性層の耐久性が向上する等の
特長を有する。The magnetic recording medium according to the present invention has the general formula [A] in the magnetic layer.
Since the magnetic powder contains the compound represented by The surface smoothness is good, the magnetic properties and electromagnetic conversion properties such as saturation magnetic flux density, squareness ratio, reproduction output and noise are improved, and the still life is greatly improved.
[It has features such as improved durability of the homomagnetic layer.
Claims (1)
む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▼［Ａ］ （但し、Ｒ＿１は炭素数１１〜１７の炭化水素基、Ｒ＿
２は炭素数１〜４の炭化水素基、ｎは１〜４の整数、Ｍ
はアルカリ金属）[Scope of Claims] A magnetic recording medium characterized in that a magnetic layer contains a compound represented by the following general formula [A]. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [A] (However, R_1 is a hydrocarbon group with 11 to 17 carbon atoms, R_
2 is a hydrocarbon group having 1 to 4 carbon atoms, n is an integer of 1 to 4, M
is an alkali metal)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61278773A JPS63133317A (en) | 1986-11-25 | 1986-11-25 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61278773A JPS63133317A (en) | 1986-11-25 | 1986-11-25 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63133317A true JPS63133317A (en) | 1988-06-06 |
Family
ID=17601984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61278773A Pending JPS63133317A (en) | 1986-11-25 | 1986-11-25 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63133317A (en) |
-
1986
- 1986-11-25 JP JP61278773A patent/JPS63133317A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4460651A (en) | Magnetic recording medium | |
| JPS63229612A (en) | Magnetic recording medium | |
| JPS6070521A (en) | Magnetic recording medium | |
| JPS63133317A (en) | Magnetic recording medium | |
| JP3132525B2 (en) | Metal magnetic powder and magnetic recording medium | |
| JP3038869B2 (en) | Magnetic recording media | |
| JPS63124217A (en) | Magnetic recording medium | |
| JPH0581972B2 (en) | ||
| JPS61180927A (en) | Magnetic recording medium | |
| KR900005802B1 (en) | Magnetic record carrier | |
| JPS62205524A (en) | Magnetic recording medium | |
| JPS63136317A (en) | Magnetic recording medium | |
| JPS63261533A (en) | Production of magnetic coating compound | |
| JPH04106719A (en) | Magnetic recording medium | |
| JPS63124216A (en) | Magnetic recording medium | |
| JPS60131625A (en) | Magnetic recording medium | |
| JPH06162482A (en) | Magnetic recording medium | |
| JPH05159279A (en) | Magnetic recording medium | |
| JPH0489615A (en) | Magnetic recording medium | |
| JPH01149220A (en) | Magnetic recording medium | |
| JPH0628664A (en) | Magnetic recording medium | |
| JPH0640383B2 (en) | Magnetic recording medium | |
| JPH04310622A (en) | Magnetic recording medium and its production | |
| JPH02260608A (en) | Fine partice of ferromagnetic metallic iron, manufacture thereof, and magnetic recording medium using same | |
| JPH0479012A (en) | Magnetic recording medium |