JPH04121816A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04121816A JPH04121816A JP2243485A JP24348590A JPH04121816A JP H04121816 A JPH04121816 A JP H04121816A JP 2243485 A JP2243485 A JP 2243485A JP 24348590 A JP24348590 A JP 24348590A JP H04121816 A JPH04121816 A JP H04121816A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- vinyl chloride
- magnetic
- maleic acid
- carboxyl groups
- 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
- 239000006247 magnetic powder Substances 0.000 claims abstract description 53
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 27
- 229920001577 copolymer Polymers 0.000 claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 20
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 17
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims abstract description 14
- 150000001875 compounds Chemical class 0.000 claims description 15
- -1 metaxylene diamine Chemical class 0.000 claims description 8
- IVSZLXZYQVIEFR-UHFFFAOYSA-N 1,3-Dimethylbenzene Natural products CC1=CC=CC(C)=C1 IVSZLXZYQVIEFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 abstract description 6
- 230000003993 interaction Effects 0.000 abstract description 6
- 239000011976 maleic acid Substances 0.000 abstract description 6
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000843 powder Substances 0.000 description 14
- 238000004381 surface treatment Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000003973 paint Substances 0.000 description 7
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229920002554 vinyl polymer Polymers 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 2
- 235000021360 Myristic acid Nutrition 0.000 description 2
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 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
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 125000002243 cyclohexanonyl group Chemical group *C1(*)C(=O)C(*)(*)C(*)(*)C(*)(*)C1(*)* 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 150000004668 long chain fatty acids Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 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
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
二の発明は磁気記録媒体に関し、さらに詳しくは、磁性
粉末の分散性が良好で電気的特性および耐久性に優れた
磁気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The second invention relates to a magnetic recording medium, and more specifically, to a magnetic recording medium in which magnetic powder has good dispersibility and excellent electrical properties and durability.
磁気記録媒体は、通常、磁性粉末、結合剤成分、有機溶
剤およびその他の必要成分からなる磁性塗料をポリエス
テルフィルムなどの基体上に塗布、乾燥してつくられ、
記録の高密度化に伴って、出力やＳ／Ｎ比などの電磁変
換特性のより一層の向上が求められている。Magnetic recording media are usually made by applying a magnetic paint consisting of magnetic powder, a binder component, an organic solvent, and other necessary components onto a substrate such as a polyester film, and drying the coating.
As recording density increases, further improvements in electromagnetic conversion characteristics such as output and S/N ratio are required.
このため、磁性粉末として、近年、微粒子化された磁性
粉末を使用して、電磁変換特性を向上させることが行わ
れている。しかしながら、磁性粉末の粒子表面は一般に
親水性が強いため、そのままでは有機化合物を主とした
組成の磁性塗料中に均一に分散させることが難しく、結
果的にＳ／Ｎ比などの電磁変換特性を充分に向上させる
ことができない。For this reason, in recent years, finely divided magnetic powder has been used as magnetic powder to improve electromagnetic conversion characteristics. However, since the particle surface of magnetic powder is generally highly hydrophilic, it is difficult to uniformly disperse it in a magnetic paint whose composition is mainly composed of organic compounds, and as a result, electromagnetic conversion characteristics such as S/N ratio are affected. cannot be improved sufficiently.
そこで、このような磁性粉末の分散性を改善するため、
例えば、長鎖脂肪酸やシランカップリング荊などで磁性
粉末を表面処理し、粒子表面に炭化水素鎖を固定して、
磁性粉末の粒子表面を親油性化したり、さらには、リン
酸基などの極性官能基を含有する高分子化合物を、あら
かじめ磁性粉末表面に吸着させたりして、磁性粉末の分
散性を改善することが試みられている。（特開昭６２１
６２３７号、特開昭６３−１０３４３１号）〔発明が解
決しようとする課題〕
ところが、長′Ｍ脂肪酸やシランカンブリング剤などで
、磁性粉末の粒子表面に炭化水素鎖を固定して、磁性粉
末の粒子表面を親油性化する方法では、磁性粉末の分散
性が向上される反面、炭化水素鎖の結合剤樹脂との相互
作用が弱い為に磁性層の耐久性が低下する。またリン酸
基などの極性官能基を含有する高分子化合物をあらかじ
め磁性粉末表面に吸着させると、耐久性が改善されるも
のの、高分子化合物の吸着層の厚さが数十人の厚さにな
るため、磁性粉末の充填性が低下する。Therefore, in order to improve the dispersibility of such magnetic powder,
For example, by surface-treating magnetic powder with long-chain fatty acids or silane coupling agents, and fixing hydrocarbon chains on the particle surface,
Improving the dispersibility of magnetic powder by making the particle surface of the magnetic powder lipophilic or by adsorbing a polymer compound containing a polar functional group such as a phosphoric acid group to the magnetic powder surface in advance. is being attempted. (Unexamined Japanese Patent Publication No. 621
(No. 6237, JP-A No. 63-103431) [Problem to be solved by the invention] However, by fixing hydrocarbon chains on the particle surface of magnetic powder using long M fatty acids, silane cambling agents, etc. Although the method of making the particle surface lipophilic improves the dispersibility of the magnetic powder, the durability of the magnetic layer decreases because the interaction of the hydrocarbon chains with the binder resin is weak. Furthermore, if a polymer compound containing a polar functional group such as a phosphate group is adsorbed on the surface of the magnetic powder in advance, durability can be improved, but the thickness of the adsorption layer of the polymer compound is several tens of times thicker. Therefore, the filling properties of the magnetic powder deteriorate.
この発明は、かかる現状に鑑み種々検討を行った結果な
されたもので、１分子中に２個以上のカルボキシル基を
含む分子量が２００〜１００００の化合物で粒子表面が
被覆された磁性粉末を使用することによって、磁性粉末
の分散性および充填性を良好にするとともに、磁性粉末
と結合剤樹脂との相互作用を良好にし、電磁変換特性お
よび耐久性を充分に向上させたものである。This invention was made as a result of various studies in view of the current situation, and uses magnetic powder whose particle surface is coated with a compound having a molecular weight of 200 to 10,000 and containing two or more carboxyl groups in one molecule. This improves the dispersibility and filling properties of the magnetic powder, improves the interaction between the magnetic powder and the binder resin, and sufficiently improves the electromagnetic conversion characteristics and durability.
また、１分子中に２個以上のカルボキシル基を含む分子
量が２００〜１００００の化合物として、塩化ビニル−
酢酸ビニル−マレイン酸共重合体または塩化ビニル−マ
レイン酸共重合体を使用し、塩化ビニル系樹脂からなる
結合剤樹脂と併用することによって、磁性粉末の分散性
および充填性をさらに改善するとともに、磁性粉末と結
合剤樹脂との相互作用をさらに改善して、電磁変換特性
および耐久性をさらに向上させたものである。In addition, vinyl chloride-
By using a vinyl acetate-maleic acid copolymer or a vinyl chloride-maleic acid copolymer in combination with a binder resin made of a vinyl chloride resin, the dispersibility and filling properties of the magnetic powder can be further improved. The interaction between the magnetic powder and the binder resin has been further improved to further improve electromagnetic conversion characteristics and durability.
そして、さらに結合剤成分として、テトラグリシジルメ
タキシレンジアミンを併用することによって、磁性粉末
の粒子表面を被覆したカルボキシル基を含む化合物との
間に架橋結合を生じさせ、耐久性を一段と向上させたも
のである。Furthermore, by using tetraglycidyl metaxylene diamine as a binder component, cross-linking occurs with the carboxyl group-containing compound that coats the particle surface of the magnetic powder, further improving durability. It is.
この発明において使用される磁性粉末は、１分子中に２
個以上のカルボキシル基を含む分子量が２００〜１００
００の化合物で、粒子表面が被覆されたものが好ましく
使用され、この被覆処理は、１分子中に２個以上のカル
ボキシル基を含む分子量が２００〜１００００の化合物
を、テトラヒドロフラン、シクロヘキサノン、トルエン
等の有機溶剤に溶解した溶液中に、磁性粉末を添加して
分散させるなどの方法で行われる。The magnetic powder used in this invention has two
The molecular weight is 200 to 100, including more than 1 carboxyl group.
It is preferable to use a compound having a molecular weight of 200 to 10,000, which contains two or more carboxyl groups in one molecule, and which is coated with a compound having a molecular weight of 200 to 10,000. This is done by adding and dispersing magnetic powder into a solution dissolved in an organic solvent.
１分子中に２個以上のカルボキシル基を含む分子量が２
００〜１００００の化合物としては、たとえば、塩化ビ
ニル−酢酸ビニル−マレイン酸共重合体または塩化ビニ
ル−マレイン酸共重合体などが好適なものとして使用さ
れ、この種の化合物は１分子中に２個以上含むカルボキ
シル基のうち１個が磁性粉末表面と結合し、残りのカル
ボキシル基が結合剤樹脂と反応するため、磁性粉末がこ
の種の親油性の物質で良好に被覆されて、親油性の結合
剤樹脂中に良好に分散されると同時に、結合剤樹脂との
相互作用が改善され、耐久性が向上される。Contains two or more carboxyl groups in one molecule and has a molecular weight of 2
As the compound of 00 to 10,000, for example, vinyl chloride-vinyl acetate-maleic acid copolymer or vinyl chloride-maleic acid copolymer is preferably used. One of the carboxyl groups contained above binds to the surface of the magnetic powder, and the remaining carboxyl group reacts with the binder resin, so the magnetic powder is well coated with this kind of lipophilic substance and the lipophilic bond is formed. It is well dispersed in the binder resin, and at the same time, the interaction with the binder resin is improved and the durability is improved.
また、この種の１分子中に２個以上のカルボキシル基を
含む化合物は、分子量が２００〜１００００で比較的低
分子量であるため、磁性粉末の粒子表面への被覆が薄（
なり、磁性層中への磁性粉末の充填率が向上される。こ
れに対し、分子量が２００より小さいものでは、被覆層
が薄すぎて粒子間の立体反発力が充分でないため分散性
が低下する。In addition, this type of compound containing two or more carboxyl groups in one molecule has a relatively low molecular weight of 200 to 10,000, so the coating on the particle surface of the magnetic powder is thin (
Therefore, the filling rate of the magnetic powder into the magnetic layer is improved. On the other hand, if the molecular weight is less than 200, the coating layer is too thin and the steric repulsion between particles is insufficient, resulting in poor dispersibility.
このような１分子中に２個以上のカルボキシル基を含む
分子量が２００〜１００００の化合物の使用量は、磁性
粉末の分散性を充分に向上させ、また結合剤樹脂に対す
る相互作用を充分に良好にするため、磁性粉末粒子表面
への被着量で０．１〜２０重量％の範囲内にするのが好
ましく、１−１０重量％の範囲内にするのがより好まし
い。The amount of such a compound containing two or more carboxyl groups in one molecule and having a molecular weight of 200 to 10,000 sufficiently improves the dispersibility of the magnetic powder and also sufficiently improves the interaction with the binder resin. Therefore, the amount of adhesion to the surface of the magnetic powder particles is preferably within the range of 0.1 to 20% by weight, and more preferably within the range of 1 to 10% by weight.
また、この発明において使用する結合剤樹脂は、塩化ビ
ニル系樹脂が好ましく使用され、この塩化ビニル系樹脂
は、１分子中に２個以上のカルボキシル基を含む分子量
が２００〜１００００の塩化ビニル−酢酸ビニル−マレ
イン酸共重合体および塩化ビニル−マレイン酸共重合体
と共通する成分を有しているため、これらの塩化ビニル
−酢酸ビニル−マレイン酸共重合体または塩化ビニル−
マレイン酸共重合体で粒子表面が被覆された磁性粉末を
、塩化ビニル系樹脂からなる結合剤樹脂と併用すると、
両者のなじみが一段と良くなり、磁性粉末の分散性およ
び充填性が一段と向上され、耐久性も一段と向上される
。Further, the binder resin used in this invention is preferably a vinyl chloride resin, and the vinyl chloride resin has a molecular weight of 200 to 10,000 and contains two or more carboxyl groups in one molecule. Because it has components common to vinyl-maleic acid copolymer and vinyl chloride-maleic acid copolymer, these vinyl chloride-vinyl acetate-maleic acid copolymers or vinyl chloride-
When magnetic powder whose particle surface is coated with maleic acid copolymer is used in combination with binder resin made of vinyl chloride resin,
The compatibility between the two is further improved, the dispersibility and filling properties of the magnetic powder are further improved, and the durability is further improved.
このような塩化ビニル系樹脂としては、たとえば、塩化
ビニル−酢酸ビニル共重合体、塩化ビニル−酢酸ビニル
−ビニルアルコール共重合体、塩化ビニル−酢酸ビニル
−無水マレイン酸共重合体、塩化ビニル−２−ヒドロキ
シエチルメタクリレート−３−スルホプロピルメタクリ
レートカリウム塩共重合体、塩化ビニル−２−ヒドロキ
シエチル−３−スルホプロピルメタクリレートカリウム
塩−グリシジルメタクリレート共重合体などが挙げられ
る。また、これらの塩化ビニル系樹脂は、従来公知の結
合剤樹脂と併用してもよく、併用する結合剤樹脂として
は、たとえば、ポリビニルブチラール系樹脂、繊維素系
樹脂、ポリウレタン系樹脂、ポリエステル系樹脂、イソ
シアフート化合物などが挙げられる。Examples of such vinyl chloride resin include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic anhydride copolymer, vinyl chloride-2 -Hydroxyethyl methacrylate-3-sulfopropyl methacrylate potassium salt copolymer, vinyl chloride-2-hydroxyethyl-3-sulfopropyl methacrylate potassium salt-glycidyl methacrylate copolymer, and the like. In addition, these vinyl chloride resins may be used in combination with conventionally known binder resins, such as polyvinyl butyral resins, cellulose resins, polyurethane resins, and polyester resins. , isocyanate compounds, and the like.
さらに、この種の１分子中に２個以上のカルボキシル基
を含む化合物で被覆された磁性粉末は、粒子表面にカル
ボキシル基が存在しているため、結合剤樹脂中に、カル
ボキシル基と反応するエポキシ基、水酸基などの官能基
を有する架橋剤、たとえば、テトラグリシジルメタキシ
レンジアミンなどを含有させると、耐久性がさらに一段
と向上される。Furthermore, magnetic powder coated with a compound containing two or more carboxyl groups in one molecule of this type has carboxyl groups on the particle surface, so the binder resin contains epoxy that reacts with the carboxyl groups. When a crosslinking agent having a functional group such as a group or a hydroxyl group, such as tetraglycidyl metaxylene diamine, is included, the durability is further improved.
この発明の磁気記録媒体を製造するには常法に準じて行
えばよく、たとえば、前記の１分子中に２個以上のカル
ボキシル基を含む分子量が２００〜１００００の化合物
で粒子表面が被覆された磁性粉末を、塩化ビニル系樹脂
などの結合剤樹脂、有機溶剤およびその他の添加剤とと
もに混合分散して磁性塗料を調製し、この磁性塗料を、
基体上に吹付けもしくはロール塗りなどの任意の手段で
塗布し、乾燥すればよい。The magnetic recording medium of the present invention may be produced according to a conventional method, for example, the particle surface may be coated with the above-mentioned compound containing two or more carboxyl groups in one molecule and having a molecular weight of 200 to 10,000. A magnetic paint is prepared by mixing and dispersing magnetic powder with a binder resin such as a vinyl chloride resin, an organic solvent, and other additives.
It may be applied onto the substrate by any method such as spraying or roll coating, and then dried.
ここで、使用される磁性粉末としては、たとえば、７−
Ｆｅ、０３粉末、Ｆｅ、Ｏ，粉末、Ｃ。Here, as the magnetic powder used, for example, 7-
Fe, 03 powder, Fe, O, powder, C.
含有７−Ｆｅ、Ｏ，粉末、Ｃｏ含有Ｆｅ３Ｏ４粉末、Ｃ
ｒ Ｏ，粉末の他、Ｆｅ粉末、ＣＯ粉末、Ｆｅ−Ｎｉ−
Ｃｒ合金粉末などの金属粉末、およびバリウムフェライ
ト粉末など、従来公知の各種磁性粉末が広（包含される
。Containing 7-Fe, O, powder, Co-containing Fe3O4 powder, C
In addition to rO, powder, Fe powder, CO powder, Fe-Ni-
A wide variety of conventionally known magnetic powders are included, such as metal powders such as Cr alloy powders, and barium ferrite powders.
また、有機溶剤としては、メチルイソブチルケトン、メ
チルエチルケトン、シクロヘキサノン、トルエン、酢酸
エチル、テトラヒドロフラン、ジオキサン、ジメチルホ
ルムアミドなど、−ｉに磁気記録媒体に使用されるもの
が単独もしくは混合して使用される。Further, as the organic solvent, those used in magnetic recording media for -i, such as methyl isobutyl ketone, methyl ethyl ketone, cyclohexanone, toluene, ethyl acetate, tetrahydrofuran, dioxane, and dimethyl formamide, are used alone or in combination.
なお、磁性塗料中には、潤滑剤、研磨剤、帯電防止剤お
よび分散剤など、一般に磁気記録媒体に使用される添加
剤を添加使用してもよい。In addition, additives generally used in magnetic recording media, such as lubricants, abrasives, antistatic agents, and dispersants, may be added to the magnetic paint.
次に、この発明の実施例について説明する。 Next, embodiments of the invention will be described.
実施例１
ｌ−Ｆｅ、０３粉末 １００重量部塩化ビニ
ル−酢酸ビニル−マレ １０〃イン酸共重合体（塩化ビ
ニル
８３重量％、酢酸ビニル１２重量
％、マレイン酸５重量％、分
多量５３００ ）
テトラヒドロフラン １０００〃上記の組成
物を７２時間撹拌し、固相を分離し、テトラヒドロフラ
ンで洗浄したのち、室温で４８時間乾燥した。Example 1 l-Fe, 03 powder 100 parts by weight Vinyl chloride-vinyl acetate-male 10 Inic acid copolymer (vinyl chloride 83% by weight, vinyl acetate 12% by weight, maleic acid 5% by weight, amount 5300) Tetrahydrofuran 1000 The above composition was stirred for 72 hours, the solid phase was separated, washed with tetrahydrofuran, and then dried at room temperature for 48 hours.
このようにして塩化ビニル−酢酸ビニル−マレイン酸共
重合体で表面処理された７−ＦｅｚＯ，。7-FezO surface-treated with vinyl chloride-vinyl acetate-maleic acid copolymer in this manner.
粉末を使用し、
７−Ｆｅ２Ｏ，粉末 ８０重量部部分ケン化
塩化ビニル−酢酸ビ ２０〃ニル共重合体
カーボンブラック ５ 〃ベンガラ
５ 〃アルミナ
５ 〃ミリスチン酸
２ 〃トルエン １５０〃
シクロヘキサノン １５０〃の組成物を
ボルルミル中で８０時間混合分散し、さらにテトラグリ
ジルメタキシレンジアミン０．５重量部と、三官能性低
分子量イソシアネート化合物５重量部を、添加混合して
磁性塗料を調製したこの磁性塗料を厚さ１４μｍのポリ
エチレンテレフタレートフィルム上に、乾燥後の厚みが
４．５μｍになるように塗布し、磁場中を通して磁性粉
を配向させた。これを乾燥したのち表面平滑処理をし、
１／２インチ巾にスリットして磁気テープを作製した。7-Fe2O, powder 80 parts by weight partially saponified vinyl chloride-vinyl acetate copolymer carbon black 5 red iron
5〃Alumina
5 Myristic acid
2〃Toluene 150〃
A composition of cyclohexanone 150〃 was mixed and dispersed in a volumil for 80 hours, and then 0.5 parts by weight of tetraglylyl metaxylene diamine and 5 parts by weight of a trifunctional low molecular weight isocyanate compound were added and mixed to prepare a magnetic paint. This magnetic paint was applied onto a polyethylene terephthalate film having a thickness of 14 μm so that the thickness after drying would be 4.5 μm, and the magnetic powder was oriented in a magnetic field. After drying this, the surface is smoothed,
A magnetic tape was prepared by slitting the tape into 1/2 inch width.
実施例２
実施例１における磁性粉末の表面処理において、塩化ビ
ニル−酢酸とニル−マレイン酸共重合体に代えて、塩化
ビニル−マレイン酸共重合体（塩化ビニル９５重量％、
マレイン酸５重量％、分子１４２００）を同量使用した
以外は、実施例１と同様にして磁性粉末の表面処理を行
い、この処理磁性粉末を使用した以外は実施例１と同様
にして磁気テープを作製した。Example 2 In the surface treatment of the magnetic powder in Example 1, vinyl chloride-maleic acid copolymer (vinyl chloride 95% by weight,
The magnetic powder was surface-treated in the same manner as in Example 1, except that the same amount of maleic acid (5% by weight, molecular 14,200) was used; was created.
実施例３
実施例１における磁性塗料の組成において、γ−Ｆｅｚ
Ｏ＝に代えて、ａ−Ｆｅｆｆｆ性粉末（ＢＥＴ比表面積
５２ ｒｒｒ ／ ｇ ）を同量使用した以外は、実施
例１と同様にして磁気テープを作製した。Example 3 In the composition of the magnetic paint in Example 1, γ-Fez
A magnetic tape was produced in the same manner as in Example 1, except that the same amount of a-Feff powder (BET specific surface area 52 rrr/g) was used in place of O=.
比較例１
実施例１における磁性粉末の表面処理において、塩化ビ
ニル−酢酸ビニル−マレイン酸共重合体ニ代工て、コハ
ク酸を同量使用した以外は、実施例１と同様にして磁性
粉末の表面処理を行い、この処理磁性粉末を使用した以
外は実施例１と同様にして磁気テープを作製した。Comparative Example 1 A magnetic powder was prepared in the same manner as in Example 1, except that in the surface treatment of the magnetic powder in Example 1, a vinyl chloride-vinyl acetate-maleic acid copolymer was used and the same amount of succinic acid was used. A magnetic tape was produced in the same manner as in Example 1 except that the surface treatment was performed and the treated magnetic powder was used.
比較例２
実施例１における磁性粉末の表面処理において、塩化ビ
ニル−酢酸ビニル−マレイン酸共重合体に代えて、塩化
ビニル−酢酸ビニル−マレイン酸共重合体（塩化ビニル
８３重量％、酢酸ビニル１２重量％、マレイン酸５重量
％、分子量３２００Ｏ）を同量使用した以外は、実施例
Ｉと同様にして磁性粉末の表面処理を行い、この処理磁
性粉末を使用した以外は実施例１と同様にして磁気テー
プを作製した。Comparative Example 2 In the surface treatment of the magnetic powder in Example 1, vinyl chloride-vinyl acetate-maleic acid copolymer (83% by weight of vinyl chloride, 12% by weight of vinyl acetate) was used instead of the vinyl chloride-vinyl acetate-maleic acid copolymer. The surface treatment of the magnetic powder was carried out in the same manner as in Example I, except that the same amount of 5% by weight, 5% by weight of maleic acid, and 3200 O (molecular weight) was used; A magnetic tape was manufactured using the following steps.
比較例３
実施例１における磁性粉末の表面処理において、塩化ビ
ニル−酢酸ビニル−マレイン酸共重合体での表面処理を
省き、無処理の７−Ｆｅ２Ｏ３粉末を使用した以外は、
実施例１と同様にして磁気テープを作製した。Comparative Example 3 In the surface treatment of the magnetic powder in Example 1, the surface treatment with vinyl chloride-vinyl acetate-maleic acid copolymer was omitted and untreated 7-Fe2O3 powder was used.
A magnetic tape was produced in the same manner as in Example 1.
比較例４
実施例３における磁性粉末の表面処理において、塩化ビ
ニル−酢酸ビニル−マレイン酸共重合体での表面処理を
省き、無処理のα−Ｆｅ磁性粉末を使用した以外は、実
施例１と同様にして磁気テープを作製した。Comparative Example 4 Same as Example 1 except that in the surface treatment of the magnetic powder in Example 3, the surface treatment with vinyl chloride-vinyl acetate-maleic acid copolymer was omitted and untreated α-Fe magnetic powder was used. A magnetic tape was produced in the same manner.
各実施例および比較例で得られた磁気テープについて、
飽和磁束密度（Ｂｍ） 、角型比（Ｂｒ／８ｍ） 、表
面光沢度、スチル耐久性、摩擦係数を測定した。このう
ち飽和磁束密度および表面光沢度は充填性の指標となり
、角型比は分散性の指標となる。また、スチル耐久性は
ＶＨ３方式のＶＴＲを用いてスチルモードで再生し、そ
の再生出力レベルが初期値から５ｄＢ低下するまでの時
間を測定した。さらに、摩擦係数は２０ｇの荷重をかけ
ステンレス製ビン上を７．２ｍ／ｓで往復摺動して測定
した。Regarding the magnetic tapes obtained in each example and comparative example,
The saturation magnetic flux density (Bm), squareness ratio (Br/8m), surface gloss, still durability, and friction coefficient were measured. Among these, the saturation magnetic flux density and surface glossiness are indicators of filling properties, and the squareness ratio is an indicator of dispersibility. Further, still durability was measured by playing back in still mode using a VH3 VTR and measuring the time until the playback output level decreased by 5 dB from the initial value. Further, the coefficient of friction was measured by sliding the bottle back and forth on a stainless steel bottle at 7.2 m/s with a load of 20 g applied.
下記第１表はその結果である。Table 1 below shows the results.
第１表
［発明の効果］
上記第１表から明らかなように、実施例１ないし３で得
られた磁気テープは、比較例１ないし４で得られた磁気
テープに比し、いずれも飽和磁束密度および角型比が高
く、光沢度が良好でスチル耐久性が長く、このことから
この発明によって得られる磁気記録媒体は、磁性粉末の
分散性が良好で、電磁変換特性に優れ、耐久性も向上さ
れていることがわかる。また、磁性粉末の粒子表面が、
１分子中に２個以上のカルボキシル基を含む分子量が２
００〜１００００の化合物で被覆された結果、ミリスチ
ン酸が磁性粉末に吸着されることもなく、その潤滑効果
が充分に発揮され、比較例１ないし４で得られた磁気テ
ープに比し、実施例１ないし３で得られた磁気テープの
摩擦係数がいずれも小さくて、耐久性が一段と向上され
ていることがわかる。Table 1 [Effects of the Invention] As is clear from Table 1 above, the magnetic tapes obtained in Examples 1 to 3 had a higher saturation magnetic flux than the magnetic tapes obtained in Comparative Examples 1 to 4. The magnetic recording medium obtained by this invention has high density and squareness ratio, good gloss, and long still durability. Therefore, the magnetic recording medium obtained by this invention has good dispersibility of magnetic powder, excellent electromagnetic conversion characteristics, and durability. You can see that it has been improved. In addition, the particle surface of the magnetic powder is
Contains two or more carboxyl groups in one molecule and has a molecular weight of 2
As a result of being coated with the compound of 00 to 10,000, myristic acid was not adsorbed to the magnetic powder, and its lubricating effect was sufficiently exhibited. It can be seen that the friction coefficients of the magnetic tapes obtained in Examples 1 to 3 are all small, and the durability is further improved.
特許出願人 日立マクセル株式会社Patent applicant: Hitachi Maxell, Ltd.
Claims (1)
が２００〜１００００の化合物で粒子表面が被覆された
磁性粉末と、結合剤樹脂とを含む磁性層を有する磁気記
録媒体 ２、１分子中に２個以上のカルボキシル基を含む分子量
が２００〜１００００の化合物が、塩化ビニル−酢酸ビ
ニル−マレイン酸共重合体または塩化ビニル−マレイン
酸共重合体である請求項１記載の磁気記録媒体 ３、結合剤樹脂が、塩化ビニル系樹脂である請求項１お
よび２記載の磁気記録媒体 ４、結合剤成分として、さらにテトラグリシジルメタキ
シレンジアミンを含有させた請求項１ないし３記載の磁
気記録媒体[Claims] 1. Magnetic recording having a magnetic layer containing a magnetic powder whose particle surface is coated with a compound having a molecular weight of 200 to 10,000 and containing two or more carboxyl groups in one molecule, and a binder resin. 1. The medium 2, the compound having a molecular weight of 200 to 10,000 and containing two or more carboxyl groups in one molecule, is a vinyl chloride-vinyl acetate-maleic acid copolymer or a vinyl chloride-maleic acid copolymer. The magnetic recording medium 3 according to claims 1 and 2, wherein the binder resin is a vinyl chloride resin, and the magnetic recording medium 4 according to claims 1 to 3, further comprising tetraglycidyl metaxylene diamine as a binder component. magnetic recording media
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2243485A JPH04121816A (en) | 1990-09-12 | 1990-09-12 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2243485A JPH04121816A (en) | 1990-09-12 | 1990-09-12 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04121816A true JPH04121816A (en) | 1992-04-22 |
Family
ID=17104594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2243485A Pending JPH04121816A (en) | 1990-09-12 | 1990-09-12 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04121816A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003501543A (en) * | 1999-06-02 | 2003-01-14 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Binders for coating compositions improved with nanoparticles and uses thereof |
-
1990
- 1990-09-12 JP JP2243485A patent/JPH04121816A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003501543A (en) * | 1999-06-02 | 2003-01-14 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Binders for coating compositions improved with nanoparticles and uses thereof |
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