JPH04241221A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04241221A JPH04241221A JP1392691A JP1392691A JPH04241221A JP H04241221 A JPH04241221 A JP H04241221A JP 1392691 A JP1392691 A JP 1392691A JP 1392691 A JP1392691 A JP 1392691A JP H04241221 A JPH04241221 A JP H04241221A
- Authority
- JP
- Japan
- Prior art keywords
- polyurethane resin
- magnetic
- recording medium
- sulfobetaine
- magnetic recording
- 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
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 29
- 239000006247 magnetic powder Substances 0.000 claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical compound C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229940117986 sulfobetaine Drugs 0.000 claims abstract description 20
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 239000011347 resin Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 239000010419 fine particle Substances 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 1
- -1 isocyanate compounds Chemical class 0.000 description 11
- 239000003973 paint Substances 0.000 description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000012948 isocyanate Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 5
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 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
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 150000003512 tertiary amines Chemical class 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- DIROHOMJLWMERM-UHFFFAOYSA-N 3-[dimethyl(octadecyl)azaniumyl]propane-1-sulfonate Chemical compound CCCCCCCCCCCCCCCCCC[N+](C)(C)CCCS([O-])(=O)=O DIROHOMJLWMERM-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 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
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy 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
- 238000003490 calendering Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N hexane Substances CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 1
- MHYFEEDKONKGEB-UHFFFAOYSA-N oxathiane 2,2-dioxide Chemical compound O=S1(=O)CCCCO1 MHYFEEDKONKGEB-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 150000008053 sultones Chemical class 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は磁気記録媒体に関し、
さらに詳しくは、特に超微粒子金属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。[Industrial Application Field] This invention relates to magnetic recording media.
More specifically, the present invention relates to a magnetic recording medium having particularly good dispersibility of ultrafine metal magnetic powder particles and excellent electrical properties and durability.
【０００２】0002
【従来の技術】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。このため、磁性粉末として、磁気特性およびＳ／Ｎ
比に優れた超微粒子金属磁性粉末を使用することが行わ
れているが、金属磁性粉末は微粒子化されるほど凝集し
やすくなり、磁性粉末の分散性が低下して、結果的には
Ｓ／Ｎ比などの電磁変換特性が低下してしまう。そこで
、この微粒子化された金属磁性粉末の分散性を改善する
ため、水酸基、カルボキシル基、スルホン酸基、リン酸
基、３級アミノ基等の極性基を持ったポリウレタン樹脂
を使用することが行われており、たとえば、超微粒子金
属磁性粉末の分散性に特に優れたものとして、ポリウレ
タン樹脂の分子中にスルホン酸金属塩を導入したものを
使用することが行われている。（特開昭５５−３８６９
３号、特開昭５７−９２４２２号、特開昭５９−３０２
３５号）[Prior Art] 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 it. With the change in output and S/N
Further improvements in electromagnetic conversion characteristics such as ratio are required. Therefore, as a magnetic powder, magnetic properties and S/N
Although ultrafine metal magnetic powder with excellent ratio is used, the finer the metal magnetic powder is, the more likely it is to aggregate, the dispersibility of the magnetic powder decreases, and as a result, the S/ Electromagnetic conversion characteristics such as N ratio deteriorate. Therefore, in order to improve the dispersibility of this finely divided metal magnetic powder, it is recommended to use a polyurethane resin having polar groups such as hydroxyl groups, carboxyl groups, sulfonic acid groups, phosphoric acid groups, and tertiary amino groups. For example, as an ultrafine metal magnetic powder having particularly excellent dispersibility, a polyurethane resin in which a sulfonic acid metal salt is introduced into the molecules has been used. (Unexamined Japanese Patent Publication No. 55-3869
No. 3, JP-A-57-92422, JP-A-59-302
No. 35)
【０００３】0003
【発明が解決しようとする課題】ところが、ポリウレタ
ン樹脂の分子中にスルホン酸金属塩等の極性基を導入す
ると、ポリウレタン樹脂の分子量を大きくすることがで
きず、またイソシアネ−ト化合物等の硬化剤と反応しに
くくなったりして、磁性層の機械的強度が低下し、耐久
性が損なわれたりする。[Problems to be Solved by the Invention] However, when a polar group such as a sulfonic acid metal salt is introduced into the molecules of polyurethane resin, the molecular weight of the polyurethane resin cannot be increased, and curing agents such as isocyanate compounds As a result, the mechanical strength of the magnetic layer decreases and its durability is impaired.
【０００４】0004
【課題を解決するための手段】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、スルホベ
タインを有するポリウレタン樹脂を、ＢＥＴ比表面積が
４０ｍ２ ／ｇ以上の超微粒子金属磁性粉末と併用する
ことによって、超微粒子金属磁性粉末の分散性を充分に
向上させ、電気的特性および耐久性を向上させたもので
ある。また、結合剤成分として、さらに塩化ビニル系樹
脂を併用することによって、電気的特性および耐久性を
さらに向上させたものである。[Means for Solving the Problems] This invention was made as a result of various studies in view of the current situation, and it is an ultrafine particle metal magnetic powder having a BET specific surface area of 40 m2 /g or more that uses a polyurethane resin containing sulfobetaine. By using the ultrafine metal magnetic powder in combination, the dispersibility of the ultrafine metal magnetic powder is sufficiently improved, and the electrical characteristics and durability are improved. Further, by further using a vinyl chloride resin as a binder component, the electrical characteristics and durability are further improved.
【０００５】この発明において、結合剤成分として使用
するるスルホベタインを有するポリウレタン樹脂は、ス
ルホベタインが単純な極性基でなく両性イオン的な基で
あるため、ＢＥＴ比表面積が４０ｍ２ ／ｇ以上の超微
粒子金属磁性粉末との親和性に優れる。また、高分子量
にすることができて、しかもイソシアネ−ト化合物など
の硬化剤との反応が阻害されず、むしろ３級アミンに類
する官能基を有するためイソシアネ−ト化合物との反応
が加速される。従って、このスルホベタインを有するポ
リウレタン樹脂を結合剤成分として使用すると、超微粒
子金属磁性粉末の分散性が充分に改善され、電気的特性
が向上されるとともに、強靭な磁性層が形成されて耐久
性が一段と向上される。[0005] In this invention, the polyurethane resin containing sulfobetaine used as a binder component has a BET specific surface area of 40 m2/g or more because sulfobetaine is not a simple polar group but a zwitterionic group. Excellent compatibility with fine particle metal magnetic powder. In addition, it can be made to have a high molecular weight, and the reaction with curing agents such as isocyanate compounds is not inhibited.In fact, since it has a functional group similar to a tertiary amine, the reaction with isocyanate compounds is accelerated. . Therefore, when this polyurethane resin containing sulfobetaine is used as a binder component, the dispersibility of the ultrafine metal magnetic powder is sufficiently improved, the electrical properties are improved, and a strong magnetic layer is formed to increase durability. will be further improved.
【０００６】このようなスルホベタインを有するポリウ
レタン樹脂は、３級アミンのような３級窒素を有するポ
リウレタン樹脂を製造し、この３級窒素を有するポリウ
レタン樹脂と、シクロプロパンサルトン、 １，３−プ
ロパンサルトン、 １，４−ブタンサルトンなどのサル
トンとを反応させて得られる。[0006] Such a polyurethane resin having sulfobetaine is produced by producing a polyurethane resin having tertiary nitrogen such as a tertiary amine, and combining this polyurethane resin having tertiary nitrogen with cyclopropane sultone, 1,3- It is obtained by reacting with sultones such as propane sultone and 1,4-butane sultone.
【０００７】このようにして得られるスルホベタインを
有するポリウレタン樹脂は、スルホベタインが分子中の
末端、主鎖、側鎖のいずれにあってもよい。また、ポリ
ウレタン樹脂中におけるスルホベタインの含有量は ０
．００５ミリモル／ｇより少ないと所期の効果が得られ
ず、 ０．１ミリモル／ｇより多くすると凝集したりす
るため、０．００５〜０．１ ミリモル／ｇの範囲内に
するのが好ましく、０．０１〜０．０５ミリモル／ｇの
範囲内にするのがより好ましい。さらに、このスルホベ
タインを有するポリウレタン樹脂は、数平均分子量が８
０００より小さいと機械的特性に劣り、１０００００よ
り大きくなると溶解性が悪くなり分散性が悪くなるため
、数平均分子量８０００〜１０００００のものが好まし
く使用され、数平均分子量１００００〜５００００のも
のがより好ましく使用される。[0007] In the polyurethane resin containing sulfobetaine thus obtained, sulfobetaine may be present at any of the terminal, main chain, or side chain of the molecule. In addition, the content of sulfobetaine in polyurethane resin is 0
．． If it is less than 0.005 mmol/g, the desired effect cannot be obtained, and if it is more than 0.1 mmol/g, it may aggregate, so it is preferably within the range of 0.005 to 0.1 mmol/g. More preferably, it is within the range of 0.01 to 0.05 mmol/g. Furthermore, this polyurethane resin containing sulfobetaine has a number average molecular weight of 8.
If it is smaller than 000, the mechanical properties will be poor, and if it is larger than 100,000, the solubility and dispersibility will be poor, so those with a number average molecular weight of 8,000 to 100,000 are preferably used, and those with a number average molecular weight of 10,000 to 50,000 are more preferable. used.
【０００８】このようなスルホベタインを有するポリウ
レタン樹脂は、塩化ビニル系樹脂と併用すると、相互の
相溶性がよく、塩化ビニル系樹脂により、磁性粉末の分
散性がさらに向上されるとともに機械的強度が強化され
て、電気的特性および耐久性が一段と向上される。[0008] When such a polyurethane resin containing sulfobetaine is used in combination with a vinyl chloride resin, it has good mutual compatibility, and the vinyl chloride resin further improves the dispersibility of the magnetic powder and increases the mechanical strength. reinforced to further improve electrical properties and durability.
【０００９】このような塩化ビニル系樹脂としては、た
とえば、塩化ビニル樹脂、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−ル共重
合体、塩化ビニル−酢酸ビニル−マレイン酸共重合体な
どが好適なものとして使用され、市販品の具体例として
は、米国 Ｕ．Ｃ．Ｃ社製；ＶＡＧＨ、ＶＹＨＨ、ＶＭ
ＣＨ、積水化学工業社製；エスレックＡ、電気化学社製
；１０００Ｇなどが挙げられる。Examples of such vinyl chloride resins include vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, and vinyl chloride-vinyl acetate-maleic acid copolymer. Polymers and the like are preferably used, and examples of commercially available products include those available in the United States. C. Manufactured by C company; VAGH, VYHH, VM
CH, manufactured by Sekisui Chemical Co., Ltd.; S-LEC A; manufactured by Denki Kagaku Co., Ltd.; 1000G, and the like.
【００１０】また、イソシアネ−ト化合物とも相溶性よ
く併用され、このイソシアネ−ト化合物と併用すると、
３級アミンに類する官能基であるスルホベタインを有す
るため、イソシアネ−ト化合物との反応が加速され、架
橋度が向上されて、耐久性が一段と向上される。[0010] It is also used in combination with an isocyanate compound with good compatibility, and when used in combination with this isocyanate compound,
Since it has sulfobetaine, which is a functional group similar to a tertiary amine, the reaction with an isocyanate compound is accelerated, the degree of crosslinking is improved, and the durability is further improved.
【００１１】このようなイソシアネ−ト化合物としては
、三官能低分子量イソシアネ−ト化合物などが好適なも
のとして使用され、市販品の具体例としては、たとえば
、日本ポリウレタン工業社製；コロネ−トＬ、バイエル
社製；デスモジュ−ルＬなどが挙げられる。As such isocyanate compounds, trifunctional low molecular weight isocyanate compounds are preferably used, and specific examples of commercially available products include, for example, Coronate L manufactured by Nippon Polyurethane Kogyo Co., Ltd. , manufactured by Bayer AG; desmodule L, etc.
【００１２】金属磁性粉末としては、ＢＥＴ比表面積が
４０ｍ２ ／ｇ以上の超微粒子金属磁性粉末が適用され
、たとえば、いずれもＢＥＴ比表面積が４０ｍ２ ／ｇ
以上のＦｅ粉末、Ｃｏ粉末、Ｆｅ−Ｎｉ−Ｃｒ合金粉末
など、従来公知の各種超微粒子金属磁性粉末が広く包含
される。[0012] As the metal magnetic powder, ultrafine metal magnetic powder having a BET specific surface area of 40 m2/g or more is used. For example, all of them have a BET specific surface area of 40 m2/g.
A wide variety of conventionally known ultrafine metal magnetic powders are included, such as the above-mentioned Fe powder, Co powder, and Fe-Ni-Cr alloy powder.
【００１３】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、前記のスルホベタイ
ンを有するポリウレタン樹脂を、他の塩化ビニル系樹脂
と併用するかあるいはしないで、ＢＥＴ比表面積が４０
ｍ２ ／ｇ以上の超微粒子金属磁性粉末、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、この磁性塗料をポリエステルフィルムなどの基体上
に、吹付けもしくはロ−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 manufactured according to a conventional method. For example, the above-mentioned polyurethane resin containing sulfobetaine may be used in combination with or without other vinyl chloride resin, and BET Specific surface area is 40
A magnetic paint is prepared by mixing and dispersing ultrafine metal magnetic powder of m2/g or more with an organic solvent and other additives, and this magnetic paint is applied onto a substrate such as a polyester film by spraying or roll coating. It can be applied by any means and dried.
【００１４】ここで、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、一般に磁気記録媒体に
使用されるものが単独もしくは二種以上混合して使用さ
れる。[0014] Examples of the organic solvent include methyl isobutyl ketone, methyl ethyl ketone, cyclohexanone,
Those commonly used in magnetic recording media, such as toluene, ethyl acetate, tetrahydrofuran, dioxane, and dimethylformamide, are used alone or in combination of two or more.
【００１５】なお、磁性塗料中には、通常使用されてい
る各種添加剤、たとえば、潤滑剤、研磨剤、帯電防止剤
、分散剤などを任意に添加使用してもよい。Note that various commonly used additives such as lubricants, abrasives, antistatic agents, dispersants, etc. may be optionally added to the magnetic paint.
【００１６】[0016]
【実施例】次に、この発明の実施例について説明する。
実施例１
１，４−ブタンジオ−ル
５ 重量部 ポリ１，６ −ヘキサ
ンカ−ボネ−トジオ−ル
１００ 〃 トリエタノ−ルア
ミン
０．５ 〃
４，４´−ジフエニルメタンジイソシアネ−ト
１０ 〃
オクチル酸スズ
０．０１ 〃 テトラヒドロフラン
４００ 〃 ト
ルエン
４００ 〃この組成物を、窒素雰囲気下にて
４０℃で６時間反応させて、３級窒素を有するポリウレ
タン樹脂を得た。[Example] Next, an example of the present invention will be described. Example 1 1,4-butanediol
5 parts by weight Poly 1,6-hexane carbonate diol
100 Triethanolamine
0.5 〃
4,4'-diphenylmethane diisocyanate
10〃
tin octylate
0.01 Tetrahydrofuran
400 Toluene
400 This composition was reacted at 40° C. for 6 hours in a nitrogen atmosphere to obtain a polyurethane resin having tertiary nitrogen.
【００１７】次に、このようにして得られた３級窒素を
有するポリウレタン樹脂を使用し、
３級窒素を有するポリウレタン樹脂
１００
重量部 シクロプロパンサルトン
０．２ 〃 テトラヒドロフラン
３００ 〃の組成物
を、４０℃で６時間反応させてスルホベタインを有する
ポリウレタン樹脂を得た。このようにして得られたスル
ホベタインを有するポリウレタン樹脂は、数平均分子量
が４００００で、スルホベタインの含有量は０．０３ミ
リモル／ｇであった。Next, using the thus obtained polyurethane resin containing tertiary nitrogen, a polyurethane resin containing tertiary nitrogen is prepared.
100
Part by weight cyclopropane sultone
0.2 Tetrahydrofuran
A polyurethane resin containing sulfobetaine was obtained by reacting the 300 〃 composition at 40°C for 6 hours. The polyurethane resin containing sulfobetaine thus obtained had a number average molecular weight of 40,000 and a sulfobetaine content of 0.03 mmol/g.
【００１８】このようにして得られたスルホベタインを
有するポリウレタン樹脂を使用し、
α−Ｆｅ磁性粉末（ＢＥＴ 比表面積４５ｍ２
／ｇ、保磁力１５００エル ８０ 重量部
ステッド、飽和磁化 １２０ ｅｍｕ／ｇ）
スルホベタインを有するポリウレタン樹脂
１８ 〃
カ−ボンブラック
１ 〃 アルミナ
２
〃 ミリスチン酸
３ 〃 シリコンオイル
０．２
〃 メチルエチルケトン
１００ 〃 シクロヘキサノン
１００ 〃
トルエン
１００ 〃の組成物をサンドミル中で２
０時間混合分散した後、さらにコロネ−トＬ（日本ポリ
ウレタン工業社製；三官能性低分子量イソシアネ−ト化
合物）を２重量部添加し、 ０．５時間混合分散して磁
性塗料を調製した。この磁性塗料を厚さ８μｍのポリエ
ステルフィルム上に、乾燥後の厚さが４μｍとなるよう
に塗布、乾燥して磁性層を形成し、カレンダ−処理後所
定の幅に裁断して磁気テ−プをつくった。Using the thus obtained polyurethane resin containing sulfobetaine, α-Fe magnetic powder (BET specific surface area 45 m2) was used.
/g, coercive force 1500 L 80 parts by weight
Stead, saturation magnetization 120 emu/g)
Polyurethane resin with sulfobetaine
18 〃
carbon black
1 Alumina
2
〃Myristic acid
3 〃 Silicone oil
0.2
〃 Methyl ethyl ketone
100 〃 Cyclohexanone
100 〃
toluene
100 〃 composition in a sand mill 2
After mixing and dispersing for 0 hours, 2 parts by weight of Coronate L (manufactured by Nippon Polyurethane Kogyo Co., Ltd.; trifunctional low molecular weight isocyanate compound) was further added, and the mixture was mixed and dispersed for 0.5 hours to prepare a magnetic paint. This magnetic paint is applied onto a polyester film with a thickness of 8 μm to a dry thickness of 4 μm, dried to form a magnetic layer, calendered, cut into a predetermined width, and made into magnetic tape. I made it.
【００１９】実施例２
実施例１における磁性塗料の組成において、スルホベタ
インを有するポリウレタン樹脂の使用量を１８重量部か
ら９重量部に変更し、新たに、ＶＡＧＨ（Ｕ．Ｃ．Ｃ
社製；塩化ビニル−酢酸ビニル−ビニルアルコ−ル共重
合体）を９重量部加えた以外は、実施例１と同様にして
磁気テ−プをつくった。Example 2 In the composition of the magnetic paint in Example 1, the amount of polyurethane resin containing sulfobetaine used was changed from 18 parts by weight to 9 parts by weight, and a new VAGH (U.C.C.
A magnetic tape was prepared in the same manner as in Example 1, except that 9 parts by weight of vinyl chloride-vinyl acetate-vinyl alcohol copolymer (manufactured by Co., Ltd.) were added.
【００２０】比較例１
実施例１における磁性塗料の組成において、スルホベタ
インを有するポリウレタン樹脂に代えてＵＲ８３００（
東洋紡社製；スルホン酸ナトリウム含有ポリウレタン樹
脂）を同量使用した以外は、実施例１と同様にして磁気
テ−プをつくった。Comparative Example 1 In the composition of the magnetic paint in Example 1, UR8300 (
A magnetic tape was produced in the same manner as in Example 1, except that the same amount of polyurethane resin containing sodium sulfonate (manufactured by Toyobo Co., Ltd.) was used.
【００２１】比較例２
実施例２における磁性塗料の組成において、スルホベタ
インを有するポリウレタン樹脂に代えてＵＲ８３００（
東洋紡社製；スルホン酸ナトリウム含有ポリウレタン樹
脂）を同量使用した以外は、実施例２と同様にして磁気
テ−プをつくった。Comparative Example 2 In the composition of the magnetic paint in Example 2, UR8300 (
A magnetic tape was prepared in the same manner as in Example 2, except that the same amount of polyurethane resin containing sodium sulfonate (manufactured by Toyobo Co., Ltd.) was used.
【００２２】比較例３
比較例２における磁性塗料の組成において、ＵＲ８３０
０に代えてＥ５５１（武田薬品工業社製；ポリウレタン
樹脂）を同量使用した以外は、比較例２と同様にして磁
気テ−プをつくった。Comparative Example 3 In the composition of the magnetic paint in Comparative Example 2, UR830
A magnetic tape was produced in the same manner as in Comparative Example 2, except that the same amount of E551 (manufactured by Takeda Pharmaceutical Company, polyurethane resin) was used instead of E551.
【００２３】各実施例および比較例で得られた磁気テ−
プについて、残留磁束密度および角型を測定し、相対感
度、耐久性および磁気ヘッド汚れを調べた。相対感度は
３１５Ｈｚにおける出力で測定し、耐久性は２５℃、６
０％ＲＨにおける出力変動が２ｄＢになるまでの走行回
数を測定した。また、磁気ヘッド汚れは１００回走行後
のヘッドの摺接部を目視にて観察し、磁気ヘッド汚れの
有無を調べた。下記表１はその結果である。[0023] The magnetic tape obtained in each example and comparative example
The residual magnetic flux density and square shape of the disc were measured, and relative sensitivity, durability, and magnetic head contamination were investigated. Relative sensitivity is measured by output at 315Hz, durability is measured at 25℃, 6
The number of runs until the output fluctuation reached 2 dB at 0% RH was measured. In addition, the presence or absence of magnetic head dirt was examined by visually observing the sliding contact portion of the head after running 100 times. Table 1 below shows the results.
【００２４】[0024]
【００２５】[0025]
【発明の効果】上記表１から明らかなように、実施例１
および２で得られた磁気テ−プは、比較例１ないし３で
得られた磁気テ−プに比し、いずれも残留磁束密度、角
型および相対感度が高く、また耐久性がよくて、磁気ヘ
ッド汚れがなく、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、超微粒子金属磁性粉末の分散性が良
好で、電磁変換特性に優れ、耐久性も一段と向上されて
いることがわかる。[Effect of the invention] As is clear from Table 1 above, Example 1
Compared to the magnetic tapes obtained in Comparative Examples 1 to 3, the magnetic tapes obtained in Comparative Examples 1 to 2 had higher residual magnetic flux density, square shape, and relative sensitivity, and had good durability. There was no magnetic head stain, which indicates that the magnetic recording medium obtained by the present invention has good dispersibility of ultrafine metal magnetic powder, excellent electromagnetic conversion characteristics, and further improved durability.
Claims (1)
樹脂を、ＢＥＴ比表面積４０ｍ２ ／ｇ以上の金属磁性
粉末とともに含んでなる磁性層を有する磁気記録媒体【
請求項２】 結合剤成分として、さらに塩化ビニル系
樹脂を含有させた請求項１記載の磁気記録媒体1. A magnetic recording medium having a magnetic layer comprising a polyurethane resin containing sulfobetaine together with a metal magnetic powder having a BET specific surface area of 40 m2/g or more.
2. The magnetic recording medium according to claim 1, further comprising a vinyl chloride resin as a binder component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1392691A JPH04241221A (en) | 1991-01-10 | 1991-01-10 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1392691A JPH04241221A (en) | 1991-01-10 | 1991-01-10 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04241221A true JPH04241221A (en) | 1992-08-28 |
Family
ID=11846793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1392691A Pending JPH04241221A (en) | 1991-01-10 | 1991-01-10 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04241221A (en) |
-
1991
- 1991-01-10 JP JP1392691A patent/JPH04241221A/en active Pending
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