JPH04241220A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04241220A JPH04241220A JP1392591A JP1392591A JPH04241220A JP H04241220 A JPH04241220 A JP H04241220A JP 1392591 A JP1392591 A JP 1392591A JP 1392591 A JP1392591 A JP 1392591A JP H04241220 A JPH04241220 A JP H04241220A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- polyurethane resin
- recording medium
- magnetic recording
- sulfobetaine
- 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
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical compound C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229940117986 sulfobetaine Drugs 0.000 claims abstract description 21
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 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
- -1 phosphate ester Chemical class 0.000 claims description 19
- 229910019142 PO4 Inorganic materials 0.000 claims description 7
- 239000010452 phosphate Substances 0.000 claims description 7
- 229920000233 poly(alkylene oxides) Polymers 0.000 claims description 7
- 239000006247 magnetic powder Substances 0.000 abstract description 16
- 150000002148 esters Chemical class 0.000 abstract 2
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 12
- 239000003973 paint Substances 0.000 description 11
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000012948 isocyanate Substances 0.000 description 9
- 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
- 230000000052 comparative effect Effects 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
- 238000006243 chemical reaction Methods 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 229910017344 Fe2 O3 Inorganic materials 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane 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
- 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
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 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
- 239000003795 chemical substances by application Substances 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000000126 substance 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
- 229920002554 vinyl polymer Polymers 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
- 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
- 229910017368 Fe3 O4 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
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 235000021314 Palmitic acid Nutrition 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
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid 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
- 238000007796 conventional method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N hexane Substances CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910001337 iron nitride Inorganic materials 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 239000000314 lubricant Substances 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
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 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
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 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
- 229920000642 polymer Polymers 0.000 description 1
- 150000003839 salts Chemical group 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- 150000008053 sultones Chemical class 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229910006297 γ-Fe2O3 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、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 good dispersibility of magnetic powder 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
してつくられる。この際使用される結合剤成分としては
、磁性粉末の分散性に優れ、磁気記録媒体に優れた電気
的特性を付与できるとともに、耐久性に優れるものが望
まれる。2. Description of the Related 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 the coating. As the binder component used in this case, it is desired that the binder component has excellent dispersibility of the magnetic powder, can impart excellent electrical properties to the magnetic recording medium, and has excellent durability.
【0003】このため、従来からこれらの特性に優れた
結合剤成分として、ポリウレタン樹脂が広く使用されて
おり、さらに磁性粉末の分散性を改善するため、ポリウ
レタン樹脂の主鎖中にカルボキシル基、スルホン酸基、
リン酸基などの極性基またはこれらの塩を導入すること
が行われている。(特開昭55−38693号、特開昭
57−92422号、特開昭59−30235号)For this reason, polyurethane resins have traditionally been widely used as binder components with excellent properties. Furthermore, in order to improve the dispersibility of magnetic powder, carboxyl groups and sulfone groups are added to the main chain of polyurethane resins. acid group,
Polar groups such as phosphate groups or salts thereof have been introduced. (JP-A-55-38693, JP-A-57-92422, JP-A-59-30235)
【0
004】0
004]
【発明が解決しようとする課題】ところが、ポリウレタ
ン樹脂の主鎖中にこれら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 these polar groups are introduced into the main chain of polyurethane resin, it is not possible to increase the molecular weight of the polyurethane resin, and it also reacts with curing agents such as isocyanate compounds. As a result, the mechanical strength of the magnetic layer decreases and the durability is impaired.
【0005】[0005]
【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結合剤成分として使
用することによって、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。[Means for Solving the Problems] This invention was made as a result of various studies in view of the current situation, and aims to improve the dispersibility of magnetic powder by using a polyurethane resin containing sulfobetaine as a binder component. It has been sufficiently improved in electrical characteristics and durability.
【0006】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、ポリアルキレンオキサイドリン
酸エステルを併用することによって、耐久性をさらに一
段と向上させたものである。[0006] Furthermore, by using vinyl chloride resin as a binder component, the electrical characteristics and durability are further improved, and by using polyalkylene oxide phosphate ester in combination, the durability is further improved. This is what I did.
【0007】この発明において、結合剤成分として使用
す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、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、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。In the present invention, the polyurethane resin containing sulfobetaine used as a binder component has excellent affinity with magnetic powder because sulfobetaine is not a simple polar group but a zwitterionic group. 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. Ru. Therefore, when polyurethane resin containing sulfobetaine is used as a binder component, the dispersibility of magnetic powder is sufficiently improved, the electrical properties are improved, and a strong magnetic layer is formed, further improving durability. be done.
【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、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。[0008] 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.
【0009】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8000より小さいと機械的特性に劣り、10000
0より大きくなると溶解性が悪くなり、分散性に劣るた
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。[0009] 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
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 recommended to keep it within the range of 0.005 to 0.1 mmol/g. Preferably 0.01 to 0.05 mmol/
It is more preferable to keep it within the range of g. Furthermore, polyurethane resins containing sulfobetaine have poor mechanical properties when the number average molecular weight is less than 8,000;
If it is larger than 0, the solubility will be poor and the 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 preferably used.
【0010】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。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 improves its mechanical strength. is strengthened, further improving electrical properties and durability.
【0011】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.
【0012】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。[0012] 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.
【0013】このようなイソシアネ−ト化合物としては
、三官能性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, manufactured by Nippon Polyurethane Industries, Ltd. L, manufactured by Bayer; Desmodule L, etc. can be mentioned.
【0014】さらに、ポリアルキレンオキサイドリン酸
エステルとも相溶性よく併用することができ、ポリアル
キレンオキサイドリン酸エステルを併用すると、磁性粉
末の分散性に優れたポリアルキレンオキサイドリン酸エ
ステルの効果が発揮されて、磁性粉末の分散性がさらに
一段と向上され、電気的特性が一段と向上される。Furthermore, it can be used in combination with polyalkylene oxide phosphate ester with good compatibility, and when used in combination with polyalkylene oxide phosphate ester, the effect of polyalkylene oxide phosphate ester, which has excellent dispersibility of magnetic powder, is exhibited. As a result, the dispersibility of the magnetic powder is further improved, and the electrical properties are further improved.
【0015】このようなポリアルキレンオキサイドリン
酸エステルとしては、たとえば、市販品の東邦化学工業
社製;ガ−ファックRE−610などが好適なものとし
て使用される。As such a polyalkylene oxide phosphate ester, for example, a commercially available product such as Garfac RE-610 manufactured by Toho Chemical Industry Co., Ltd. is preferably used.
【0016】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
および分散剤と併用するかあるいはしないで、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。[0016] 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 or may not be used in combination with another vinyl chloride resin and a dispersant. A magnetic paint is prepared by mixing and dispersing magnetic powder, an organic solvent, and other additives, and this magnetic paint is applied onto a substrate such as a polyester film by any method such as spraying or roll coating. , just dry it.
【0017】ここで、使用される磁性粉末としては、た
とえば、γ−Fe2O3 粉末、Fe3 O4 粉末、
γ−Fe2 O3 とFe3 O4 との中間酸化状態
の酸化鉄粉末、Co含有γ−Fe2 O3 粉末、Co
含有Fe3 O4 粉末、CrO2 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、窒化鉄の如き窒化物
系磁性粉末など、従来公知の各種磁性粉末が広く包含さ
れる。[0017] Examples of the magnetic powder used here include γ-Fe2O3 powder, Fe3O4 powder,
Iron oxide powder in intermediate oxidation state between γ-Fe2 O3 and Fe3 O4, Co-containing γ-Fe2 O3 powder, Co
In addition to containing Fe3O4 powder and CrO2 powder, various conventionally known magnetic powders such as metal powders such as Fe powder, Co powder, and Fe-Ni-Cr alloy powder, barium ferrite powder, and nitride-based magnetic powder such as iron nitride can be used. Broadly encompassing.
【0018】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、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。[0018] As the organic solvent, those commonly used in magnetic recording media, such as methyl isobutyl ketone, methyl ethyl ketone, cyclohexanone, toluene, ethyl acetate, tetrahydrofuran, dioxane, and dimethyl formamide, can be used alone or in combination of two or more. be done.
【0019】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。It should be noted that various commonly used additives such as lubricants, abrasives, antistatic agents, dispersants, etc. may be optionally added to the magnetic paint.
【0020】[0020]
【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´−ジフェ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.
【0021】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 polyurethane resin containing tertiary nitrogen obtained in this way, the 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.
【0022】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、
Co含有γ−Fe2 O3 粉末
80 重量部 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 〃 パルミチン酸
1.5 〃
流動パラフィン
0.5 〃 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10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、0.2 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7μm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, Co-containing γ-Fe2 O3 powder was prepared.
80 parts by weight Polyurethane resin containing sulfobetaine
18 〃 Carbon black
1 Alumina
2 〃 Palmitic acid
1.5 〃
liquid paraffin
0.5 〃 Methyl ethyl ketone
100 〃 Cyclohexanone
100
〃 Toluene
After mixing and dispersing the composition of 100 in a sand mill for 10 hours, 2 parts by weight of Coronate L (manufactured by Nippon Polyurethane Industries, Ltd.; trifunctional low molecular weight isocyanate compound) was further added and mixed for 0.2 hours. A magnetic paint was prepared by dispersing it. This magnetic paint is applied onto a polyester film with a thickness of 7 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.
【0023】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8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10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 the polyurethane resin containing sulfobetaine used was changed from 18 parts by weight to 8 parts by weight, and VAGH (manufactured by U.C.C.; A magnetic tape was prepared in the same manner as in Example 1, except that 10 parts by weight of vinyl-vinyl acetate-vinyl alcohol copolymer) was added.
【0024】実施例3
実施例2における磁性塗料の組成において、ガ−ファッ
クRE610(東邦化学工業社製;ポリアルキレンオキ
サイドリン酸エステル)を新たに 1.5重量部加えた
以外は、実施例2と同様にして磁気テ−プをつくった。Example 3 The composition of the magnetic paint in Example 2 was the same as that of Example 2 except that 1.5 parts by weight of Garfac RE610 (manufactured by Toho Chemical Industries, Ltd.; polyalkylene oxide phosphate ester) was newly added. Magnetic tape was made in the same manner.
【0025】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ニッポラン23
01(日本ポリウレタン工業社製;ウレタンエラストマ
−)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, Nipporan 23 was used instead of the polyurethane resin containing sulfobetaine.
A magnetic tape was produced in the same manner as in Example 1, except that the same amount of 01 (manufactured by Nippon Polyurethane Kogyo Co., Ltd.; urethane elastomer) was used.
【0026】比較例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 2 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.
【0027】比較例3
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 3 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.
【0028】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
周波数315Hzにおける出力を測定し、耐久性は25
℃、相対湿度60%において出力変動が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10
0回走行時のヘッドの摺接面を目視にて観察し、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。[0028] 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 measures output at a frequency of 315Hz, durability is 25
℃ and 60% relative humidity, the number of runs until the output fluctuation became 2 dB was measured. Also, the magnetic head dirt is 10
The sliding contact surface of the head during the 0th run was visually observed to determine whether there was any dirt on the magnetic head. Table 1 below shows the results.
【0029】[0029]
【0030】[0030]
【発明の効果】上記表1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−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、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、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 3 all have higher residual magnetic flux density, square shape, and relative sensitivity, are more durable, and have better magnetic properties. There was no head contamination, which indicates that the magnetic recording medium obtained by the present invention has good dispersibility of magnetic powder, excellent electromagnetic conversion characteristics, and further improved durability.
Claims (2)
有するポリウレタン樹脂が含まれてなる磁性層を有する
磁気記録媒体[Claim 1] A magnetic recording medium having a magnetic layer containing a polyurethane resin having sulfobetaine as a binder component.
系樹脂を含有させた請求項1記載の磁気記録媒体【請求
項3】 磁性層中に、さらにポリアルキレンオキサイ
ドリン酸エステルを含有させた請求項1および2記載の
磁気記録媒体2. The magnetic recording medium according to claim 1, further comprising a vinyl chloride resin as a binder component. 3. The magnetic recording medium according to claim 1, further comprising a polyalkylene oxide phosphate ester in the magnetic layer. Magnetic recording medium according to 1 and 2
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1392591A JPH04241220A (en) | 1991-01-10 | 1991-01-10 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1392591A JPH04241220A (en) | 1991-01-10 | 1991-01-10 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04241220A true JPH04241220A (en) | 1992-08-28 |
Family
ID=11846765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1392591A Pending JPH04241220A (en) | 1991-01-10 | 1991-01-10 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04241220A (en) |
-
1991
- 1991-01-10 JP JP1392591A patent/JPH04241220A/en active Pending
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