JPS6216451B2 - - Google Patents
Info
- Publication number
- JPS6216451B2 JPS6216451B2 JP56019797A JP1979781A JPS6216451B2 JP S6216451 B2 JPS6216451 B2 JP S6216451B2 JP 56019797 A JP56019797 A JP 56019797A JP 1979781 A JP1979781 A JP 1979781A JP S6216451 B2 JPS6216451 B2 JP S6216451B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- magnetic
- magnetic particles
- aluminum alcoholate
- present
- 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.)
- Expired
Links
- 230000005291 magnetic effect Effects 0.000 claims description 32
- 239000006249 magnetic particle Substances 0.000 claims description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 23
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- 150000001875 compounds Chemical class 0.000 claims description 20
- 125000004432 carbon atom Chemical group C* 0.000 claims description 6
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 2
- 150000002430 hydrocarbons Chemical group 0.000 description 10
- 229920001577 copolymer Polymers 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 8
- -1 methylvinyl group Chemical group 0.000 description 8
- 239000003973 paint Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Chemical class 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 125000003342 alkenyl group Chemical group 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 2
- WDJHALXBUFZDSR-UHFFFAOYSA-N acetoacetic acid Chemical group CC(=O)CC(O)=O WDJHALXBUFZDSR-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 150000001338 aliphatic hydrocarbons Chemical group 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 125000006038 hexenyl group Chemical group 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229930195734 saturated hydrocarbon Natural products 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- HNAGHMKIPMKKBB-UHFFFAOYSA-N 1-benzylpyrrolidine-3-carboxamide Chemical compound C1C(C(=O)N)CCN1CC1=CC=CC=C1 HNAGHMKIPMKKBB-UHFFFAOYSA-N 0.000 description 1
- JLPULHDHAOZNQI-ZTIMHPMXSA-N 1-hexadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCCCCCC\C=C/C\C=C/CCCCC JLPULHDHAOZNQI-ZTIMHPMXSA-N 0.000 description 1
- 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 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- 229910020674 Co—B Inorganic materials 0.000 description 1
- 229910020516 Co—V Inorganic materials 0.000 description 1
- 229920000877 Melamine resin Polymers 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
- 229910018657 Mn—Al Inorganic materials 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 125000005907 alkyl ester group Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000001204 arachidyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- FHTACFVZIAVFCY-UHFFFAOYSA-N buta-1,3-diene;2-methylprop-2-enoic acid;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N.CC(=C)C(O)=O FHTACFVZIAVFCY-UHFFFAOYSA-N 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- LTMGJWZFKVPEBX-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile;prop-2-enoic acid Chemical compound C=CC=C.C=CC#N.OC(=O)C=C LTMGJWZFKVPEBX-UHFFFAOYSA-N 0.000 description 1
- OBNCKNCVKJNDBV-UHFFFAOYSA-N butanoic acid ethyl ester Natural products CCCC(=O)OCC OBNCKNCVKJNDBV-UHFFFAOYSA-N 0.000 description 1
- 125000004369 butenyl group Chemical group C(=CCC)* 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000003493 decenyl group Chemical group [H]C([*])=C([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229910001337 iron nitride Inorganic materials 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000005064 octadecenyl group Chemical group C(=CCCCCCCCCCCCCCCCC)* 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-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
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002255 pentenyl group Chemical group C(=CCCC)* 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester 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
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229940083466 soybean lecithin Drugs 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 125000002469 tricosyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/712—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the surface treatment or coating of magnetic particles
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Description
本発明は、磁気テープ等の磁気記録媒体に関す
るものである。
従来の磁気記録媒体では、磁性層を形成するに
際し、磁性粒子（磁性粉）と結合剤と溶剤とを主
体とする磁性塗料をベースフイルム上に塗布、乾
燥して磁性層を形成している。この場合、磁性塗
料中での磁性粒子の良好な分散は、磁性層形成後
の磁気記録媒体のＳ／Ｎ比、角型比（Br／
Bm）、及び磁性粒子の充填性の向上につながるの
で、磁性粒子の塗料中での分散性の向上が望まれ
ている。この目的のために、磁性塗料中に分散剤
を添加したり、磁性粒子の表面を親油性表面に改
質処理すること等が従来から知られている。従来
用いられていた分散剤としては、炭素原子数12〜
18個の脂肪酸、或いはこれら脂肪酸のアルキルエ
ステル、金属塩、酸アミド、硫酸エステル及びリ
ン酸エステルが挙げられる。更にレシチン、高級
アルコール、高級アミン等も使用できることは公
知である。また磁性粒子の親油性表面への改質処
理としては、磁性粒子の表面に存在する水酸基を
アルキル化したり、アルコキシシランやアルキル
クロメートなどで処理すること等が公知である。
しかしながら、上記の如き分散剤を使用する方法
にしても、また親油性の表面に改質処理する方法
にしても必ずしも所望の効果が得られていない。
したがつて、本発明は、磁性粒子の分散性を向
上させることによつて、Ｓ／Ｎ比、角型化
（Br／Bm）、磁性層の充填性などが改良された磁
気記録媒体を提供するものである。
本発明に用いられる磁性粒子は、一般式
（式中、R1およびR2は同一または異なつていて、
いずれも炭素数１から10までの炭化水素基を意味
し、R3は炭素数５から25までの炭化水素基を意
味する。）
で表わされるアルミニウムアルコラート化合物に
よつて処理されることによつて、非磁性支持体上
に形成される磁性層中での分散性が向上せしめら
れている。
上記一般式（）においてR1、R2およびR3と
して示される「炭化水素基」としては、直鎖状ま
たは分枝状の飽和または不飽和の炭化水素残基が
挙げられ、例えば飽和または不飽和の脂肪族炭化
水素残基、更に詳細には、アルキル基またはアル
ケニル基などが挙げられる。なお、R1およびR2
で示される炭化水素基の例としては、メチル基、
エチル基、プロピル基、イソプロピル基、ブチル
基、イソブチル基、オクチル基、デシル基などの
アルキル基、ビニル基、プロペニル基、メチルビ
ニル基、ブテニル基、ヘキセニル基などのアルケ
ニル基等が挙げられる。またR3で示される炭化
水素基の例としては、ペンチル基、メチルブチル
基、ヘキシル基、オクチル基、エチルオクチル
基、デシル基、ドデシル基、ペンタデシル基、オ
クタデシル基、メチルヘプタデシ基、エイコシル
基、トリコシル基などのアルキル基、ペンテニル
基、ヘキセニル基、メチルペンテニル基、デセニ
ル基、オクタデセニル基などのアルケニル基等が
挙げられる。なお、R1およびR2で表わされる炭
化水素基は炭素原子数が１ないし５のものが好ま
しく、またR3で表わされる炭化水素基は炭素原
子数が８ないし20のものが好ましい。
また、本発明において用いられる磁性粒子とし
ては、従来から磁気記録媒体に用いられているも
のであつてよく、例えばγ−Fe2O3、Fe3O4、γ
−Fe2O3およびFe3O4の混晶、コバルトをドープ
したγ−Fe2O3又はFe3O4、CrO2、バリウムフエ
ライト、ベルトライド化合物および他の強磁性合
金粉末（例えばFe−Co、Co−Ni、Fe−Co−
Ni、Fe−Co−Ｂ、Fe−Co−Cr−Ｂ、Mn−Bi、
Mn−Al、Fe−Co−Ｖ）、窒化鉄等が挙げられ
る。
本発明において用いられる磁性粒子は、上記磁
性粒子を上記一般式（）で表わされるアルミニ
ウムアルコラート化合物によつて表面処理され
る。この表面処理の方法は公知のいずれの方法に
よつても行うことができる。しかし、非磁性支持
体上に塗布するための磁性塗料の製造方法によつ
てその表面処理法も異つてくる。用いられる磁性
塗料は、磁性粒子の他、結合剤、溶剤その他の成
分から通常なつていて、全成分を同時に混入する
方法、一部の成分をまず混合した後残りの成分を
添加する方法など従来周知の方法によつて製造さ
れる。したがつて、磁性塗料の製造前に、磁性粒
子を上記アルミニウムアルコラート化合物（）
の溶液に浸漬することによつて予め表面処理した
磁性粒子を他の成分と混入してもよいし、また上
記アルミニウムアルコラート化合物（）を磁性
粒子を含有する磁性塗料に添加してもよい。更
に、特に磁性粒子の表面に存在する水酸基と上記
アルミニウムアルコラートとの反応により脱離す
るアルコールおよび未反応のアルミニウムアルコ
ラート化合物を除くために溶剤置換をした後に、
結合剤を添加することも可能である。なお、上記
アルミニウムアルコラート化合物（）を磁性粒
子を含む磁性塗料成分と共に用いる場合には、磁
性粒子の他に、その他の成分も上記アルミニウム
アルコラート化合物（）によつて表面処理され
ることになり、これらの成分もまた特に磁性粒子
の分散性に寄与することができ好ましい。また、
磁性塗料を構成する成分である磁性粒子以外のも
ので、特に活性水素基をその表面に有する帯電防
止剤や研磨剤などの成分をも上記アルミニウムア
ルコラート化合物（）で表面処理したものが磁
性粒子の分散性を向上させることができ好まし
い。
なお、上記一般式（）で表わされるアルミニ
ウムアルコラート化合物は、磁性粒子100重量部
に対して、約0.5ないし約20重量部、好ましくは
約１ないし約15重量部使用するのが都合がよい。
また、上記一般式で表わされるアルミニウムアル
コラート化合物は一種類だけでもまたその他の種
類のものと混合して使用してもよい。
ところで、本発明において使用する磁性粒子の
ような酸化物においては当然のことであるが、合
金や金属粒子においても、その粒子表面は、極め
て稀な状況下を除いては、酸化物層を有してい
る。また、この粒子表面に存在する酸化物層に
は、通常の状況下では、吸着水を有していること
が知られている。しかも、このような吸着水は、
その酸化物層の表面に化学結合により強固に吸着
しており、酸化物層上で解離して水酸基として金
属イオンに結合している。したがつて、この水酸
基は、例えば300〜400℃の加熱によつても完全に
は脱離しないことが知られている。
本発明において用いられるアルミニウムアルコ
ラート化合物は、上記一般式（）で示すよう
に、そのアルミニウム原子には、２個のアルコキ
シ基などの側鎖の他に、アセト酢酸エステル残基
が結合されている。しかし、アセト酢酸エステル
残基はアルミニウム原子とキレート結合によつて
も結合しているので加水分解され難いのに対し、
アルコキシ基などの側鎖は２個とも加水分解され
易いので、磁性粒子などの表面に存在する水酸基
とは次のように反応するものと考えられる。
上記に示す如く、本発明に用いられるアルミニ
ウムアルコラート化合物（）は、磁性粒子など
の表面に存在する水酸基と反応することによつ
て、加水分解され易い側鎖は脱離されて磁性粒子
などの表面に存する金属と結合されることにな
る。この場合、上記アルミニウムアルコラート化
合物（）には加水分解され易い側鎖が２個ある
ので、上記一般式（）で示すように、その側鎖
の１方だけが、即ち単座にて上記金属に結合され
る場合と、上記一般式（）で示すように、その
側鎖の両方が、即ち二座にて上記金属に結合され
る場合が考えられる。しかし、いずれの場合にお
いても、上記アルミニウムアルコラート化合物
（）は磁性粒子などの表面に結合されて、特に
磁性粒子の表面が親油性に改質されるとともに、
上記アルミニウムアルコラート化合物（）に存
在する長鎖状の炭化水素基よりなる親油性基が特
に磁性粒子の表面に強固に結合されて、その親油
性基のエントロピー効果の反撥力によつてその磁
性粒子の分散性を向上している。
本発明の磁気記録媒体の他の材料や作成工程
は、従来の磁気記録媒体の製造において採用され
ている公知のものが使用可能である。使用可能な
結合剤としては、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−マレイン酸
共重合体、塩化ビニル−塩化ビニリデン共重合
体、塩化ビニル−アクリロニトリル共重合体、ア
クリル酸エステル−アクリロニトリル共重合体、
アクリル酸エステル−塩化ビニリデン共重合体、
メタクリル酸エステル−塩化ビニリデン共重合
体、メタクリル酸エステル−スチレン共重合体、
熱可塑ポリウレタン樹脂、フエノキシ樹脂、ポリ
弗化ビニル、塩化ビニリデン−アクリロニトリル
共重合体、ブタジエン−アクリロニトリル共重合
体、アクリロニトリル−ブタジエン−アクリル酸
共重合体、アクリロニトリル−ブタジエン−メタ
クリル酸共重合体、ポリビニルブチラール、セル
ロース誘導体、スチレン−ブタジエン共重合体、
ポリエステル樹脂、フエノール樹脂、エポキシ樹
脂、熱硬化性ポリウレタン樹脂、尿素樹脂、メラ
ミン樹脂、アルキド樹脂、尿素−ホルムアルデヒ
ド樹脂等、或いはこれらの混合物が挙げられる。
これらの結合剤のうち、活性水素基を有する結合
剤の場合はアルミニウムアルコラート化合物と反
応する可能性があるので、活性水素基のない結合
剤又は活性水素基の少ない結合剤を使用するのが
望ましい。
また磁性塗料を調製する上で使用可能な溶剤と
しては、アセトン、メチルエチルケトン、メチル
イソブチルケトン、シクロヘキサノン等のケト
ン；メタノール、エタノール、プロパノール、ブ
タノール等のアルコール；酢酸メチル、酢酸エチ
ル、酢酸ブチル、酪酸エチル等のエステル；エチ
レングリコールジメチルエーテル、エチレングリ
コールモノエチルエーテル、ジオキサン等のグリ
コールエーテル；ベンゼン、トルエン、キシレン
等の芳香族炭化水素；ヘキサン、ヘプタン等の脂
肪族炭化水素；或いはこれらの混合物が挙げられ
る。
また研摩剤として酸化アルミニウム、酸化クロ
ム、酸化シリコンが使用でき、帯電防止剤として
カーボンブラツクが使用でき、更に潤滑剤として
二硫化モリブデン、グラフアイト、シリコーンオ
イルが使用できる。
また本発明の磁気記録媒体の支持体（ベースフ
イルム）は、ポリエチレンテレフタレート等のポ
リエステル、ポリプロピレン等のポリオレフイ
ン、セルローストリアセテートやセルロースジア
セテート等のセルロース誘導体、ポリカーボネー
ト、ポリ塩化ビニル、ポリイミド、アルミニウム
や銅等の金属、紙等の非磁性体からなつている。
以下、本発明を実施例に基いて更に詳細に説明
する。
実施例
次の組成物を調製した。
The present invention relates to magnetic recording media such as magnetic tape. In conventional magnetic recording media, when forming a magnetic layer, a magnetic coating mainly consisting of magnetic particles (magnetic powder), a binder, and a solvent is applied onto a base film and dried to form the magnetic layer. In this case, good dispersion of magnetic particles in the magnetic coating material depends on the S/N ratio and squareness ratio (Br/
Bm) and the filling properties of the magnetic particles, so it is desired to improve the dispersibility of the magnetic particles in the paint. For this purpose, it is conventionally known to add a dispersant to a magnetic paint, to modify the surface of magnetic particles to make them lipophilic. Conventionally used dispersants have a carbon atom count of 12 or more.
Examples include 18 fatty acids, or alkyl esters, metal salts, acid amides, sulfuric esters, and phosphoric esters of these fatty acids. Furthermore, it is known that lecithin, higher alcohols, higher amines, etc. can also be used. In addition, as a modification treatment to make the lipophilic surface of the magnetic particles, it is known to alkylate the hydroxyl groups present on the surface of the magnetic particles, or to treat them with alkoxysilane, alkylchromate, or the like.
However, even with the method of using a dispersant as described above or the method of modifying the lipophilic surface, the desired effect is not necessarily obtained. Therefore, the present invention provides a magnetic recording medium in which the S/N ratio, squaring (Br/Bm), filling properties of the magnetic layer, etc. are improved by improving the dispersibility of magnetic particles. It is something to do. The magnetic particles used in the present invention have the general formula (In the formula, R 1 and R 2 are the same or different,
All of them mean a hydrocarbon group having 1 to 10 carbon atoms, and R 3 means a hydrocarbon group having 5 to 25 carbon atoms. ) The dispersibility in the magnetic layer formed on the nonmagnetic support is improved by treatment with the aluminum alcoholate compound represented by the following. The "hydrocarbon group" shown as R 1 , R 2 and R 3 in the above general formula () includes linear or branched saturated or unsaturated hydrocarbon residues, such as saturated or unsaturated hydrocarbon groups. Examples include saturated aliphatic hydrocarbon residues, more specifically alkyl groups or alkenyl groups. Furthermore, R 1 and R 2
Examples of hydrocarbon groups represented by include methyl group,
Examples include alkyl groups such as ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, octyl group, and decyl group, and alkenyl groups such as vinyl group, propenyl group, methylvinyl group, butenyl group, and hexenyl group. Examples of the hydrocarbon group represented by R3 include pentyl group, methylbutyl group, hexyl group, octyl group, ethyl octyl group, decyl group, dodecyl group, pentadecyl group, octadecyl group, methylheptadecy group, eicosyl group, and tricosyl group. and alkenyl groups such as pentenyl group, hexenyl group, methylpentenyl group, decenyl group, and octadecenyl group. The hydrocarbon groups represented by R 1 and R 2 preferably have 1 to 5 carbon atoms, and the hydrocarbon group represented by R 3 preferably has 8 to 20 carbon atoms. Furthermore, the magnetic particles used in the present invention may be those conventionally used in magnetic recording media, such as γ-Fe 2 O 3 , Fe 3 O 4 , γ
- mixed crystals of Fe 2 O 3 and Fe 3 O 4 , cobalt-doped γ-Fe 2 O 3 or Fe 3 O 4 , CrO 2 , barium ferrite, bertolide compounds and other ferromagnetic alloy powders (e.g. Fe- Co, Co−Ni, Fe−Co−
Ni, Fe-Co-B, Fe-Co-Cr-B, Mn-Bi,
Mn-Al, Fe-Co-V), iron nitride, etc. The magnetic particles used in the present invention are surface-treated with an aluminum alcoholate compound represented by the above general formula (). This surface treatment can be carried out by any known method. However, the method of surface treatment differs depending on the method of manufacturing the magnetic coating material for coating on the non-magnetic support. The magnetic paint used usually consists of magnetic particles, a binder, a solvent, and other components, and conventional methods include mixing all the components at the same time, mixing some components first, and then adding the remaining components. Manufactured by a well-known method. Therefore, before manufacturing magnetic paint, magnetic particles are mixed with the above aluminum alcoholate compound ().
Magnetic particles whose surface has been previously treated by immersing them in a solution of may be mixed with other components, or the aluminum alcoholate compound () may be added to a magnetic paint containing magnetic particles. Furthermore, after performing solvent substitution in order to remove the alcohol and unreacted aluminum alcoholate compounds that are eliminated by the reaction between the hydroxyl groups present on the surface of the magnetic particles and the aluminum alcoholate,
It is also possible to add binders. In addition, when the above aluminum alcoholate compound () is used together with a magnetic paint component containing magnetic particles, other components in addition to the magnetic particles will also be surface treated with the above aluminum alcoholate compound (), and these These components are also preferred because they can particularly contribute to the dispersibility of the magnetic particles. Also,
In addition to magnetic particles, which are components of magnetic coatings, components such as antistatic agents and abrasives that have active hydrogen groups on their surfaces are also surface-treated with the aluminum alcoholate compound (). It is preferable because it can improve dispersibility. It is convenient to use the aluminum alcoholate compound represented by the above general formula () in an amount of about 0.5 to about 20 parts by weight, preferably about 1 to about 15 parts by weight, per 100 parts by weight of the magnetic particles.
Further, the aluminum alcoholate compound represented by the above general formula may be used alone or in combination with other types. By the way, it is a matter of course for oxides such as the magnetic particles used in the present invention, but also for alloys and metal particles, the particle surface does not have an oxide layer except under extremely rare circumstances. are doing. Furthermore, it is known that the oxide layer present on the particle surface contains adsorbed water under normal circumstances. Moreover, such adsorbed water is
It is strongly adsorbed on the surface of the oxide layer through chemical bonds, and is dissociated on the oxide layer to bond to metal ions as hydroxyl groups. Therefore, it is known that this hydroxyl group is not completely eliminated even by heating, for example, at 300 to 400°C. As shown in the above general formula (), the aluminum alcoholate compound used in the present invention has an acetoacetate residue bonded to the aluminum atom in addition to side chains such as two alkoxy groups. However, since the acetoacetate residue is also bonded to the aluminum atom through a chelate bond, it is difficult to be hydrolyzed.
Since both side chains such as alkoxy groups are easily hydrolyzed, it is thought that they react with hydroxyl groups present on the surface of magnetic particles as follows. As shown above, the aluminum alcoholate compound () used in the present invention reacts with the hydroxyl group present on the surface of the magnetic particles, etc., so that side chains that are easily hydrolyzed are eliminated, and the It will be combined with the metal present in the In this case, since the aluminum alcoholate compound () has two side chains that are easily hydrolyzed, only one of the side chains bonds to the metal, as shown in the general formula () above. and, as shown in the above general formula (), both of its side chains may be bonded to the metal in a bidentate manner. However, in any case, the aluminum alcoholate compound () is bonded to the surface of the magnetic particles, etc., and the surface of the magnetic particles is particularly modified to be lipophilic.
The lipophilic group consisting of a long-chain hydrocarbon group present in the aluminum alcoholate compound () is particularly strongly bonded to the surface of the magnetic particles, and the repulsive force of the entropic effect of the lipophilic group causes the magnetic particles to Improves dispersibility. As for other materials and manufacturing steps for the magnetic recording medium of the present invention, known materials used in the manufacture of conventional magnetic recording media can be used. Usable binders include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-vinylidene chloride copolymer, Vinyl chloride-acrylonitrile copolymer, acrylic acid ester-acrylonitrile copolymer,
Acrylic acid ester-vinylidene chloride copolymer,
Methacrylic acid ester-vinylidene chloride copolymer, methacrylic acid ester-styrene copolymer,
Thermoplastic polyurethane resin, phenoxy resin, polyvinyl fluoride, vinylidene chloride-acrylonitrile copolymer, butadiene-acrylonitrile copolymer, acrylonitrile-butadiene-acrylic acid copolymer, acrylonitrile-butadiene-methacrylic acid copolymer, polyvinyl butyral , cellulose derivative, styrene-butadiene copolymer,
Examples include polyester resins, phenolic resins, epoxy resins, thermosetting polyurethane resins, urea resins, melamine resins, alkyd resins, urea-formaldehyde resins, and mixtures thereof.
Among these binders, binders with active hydrogen groups may react with aluminum alcoholate compounds, so it is preferable to use binders without active hydrogen groups or with few active hydrogen groups. . Solvents that can be used to prepare magnetic paints include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohols such as methanol, ethanol, propanol, and butanol; methyl acetate, ethyl acetate, butyl acetate, and ethyl butyrate. Glycol ethers such as ethylene glycol dimethyl ether, ethylene glycol monoethyl ether, and dioxane; Aromatic hydrocarbons such as benzene, toluene, and xylene; Aliphatic hydrocarbons such as hexane and heptane; and mixtures thereof. Aluminum oxide, chromium oxide, and silicon oxide can be used as abrasives, carbon black can be used as an antistatic agent, and molybdenum disulfide, graphite, and silicone oil can be used as lubricants. The support (base film) of the magnetic recording medium of the present invention may be made of polyester such as polyethylene terephthalate, polyolefin such as polypropylene, cellulose derivatives such as cellulose triacetate or cellulose diacetate, polycarbonate, polyvinyl chloride, polyimide, aluminum, copper, etc. It is made of non-magnetic materials such as metal and paper. Hereinafter, the present invention will be explained in more detail based on Examples. Examples The following compositions were prepared.
【表】
上記の組成物をボールミルに入れ、15時間混合
分散させ、次いで下記組成の結合剤溶液を加え、
引き続き24時間ボールミルにて混合し、磁性塗料
を得た。
塩化ビニル−酢酸ビニル共重合体〔ユニオンカー
バイト社製のビニライトVYHH、塩化ビニル：酢
酸ビニル（重量比）＝87：13〕 17重量部
シクロヘキサノン（溶剤） 120重量部
得られた磁性塗料を厚さ20μのポリエステルフ
イルムに乾燥後の塗膜厚６μとなるごとくに塗布
し、磁場印加による配向後に加熱乾燥して磁気テ
ープを得た。得られた磁気テープの特性を測定し
たところ、飽和磁束密度（Bm）は1550ガウス
（カレンダー処理なし、以下の値はすべてカレン
ダー処理なしの値である）、角型比（Br／Bm）
は0.83、抗磁力（Hc）は368Oeであり、いずれも
良好であつた。
なおアルミニウムアルコラート化合物の添加量
を種々変えた場合に得られたデータを後記の表に
示した。
比較例
上記実施例におけるアルミニウムアルコラート
化合物に代えて、粗製大豆レシチン５重量部を使
用して上記実施例と同様に処理した磁性粉を用い
て磁気テープを製作した。得られた磁気テープの
特性は、飽和磁束密度（Bm）が1210ガウス、角
型比（Br／Bm）が0.81、抗磁力（Hc）が352Oe
であつた。
下記表には、上記の実施例及び比較例のデータ
を比較して示したが、本実施例ではBm、Rsとも
に向上することが分かる。[Table] The above composition was placed in a ball mill, mixed and dispersed for 15 hours, and then a binder solution with the following composition was added.
Subsequently, the mixture was mixed in a ball mill for 24 hours to obtain a magnetic paint. Vinyl chloride-vinyl acetate copolymer [Vinyrite VYHH manufactured by Union Carbide, vinyl chloride: vinyl acetate (weight ratio) = 87:13] 17 parts by weight Cyclohexanone (solvent) 120 parts by weight The mixture was coated on a 20μ polyester film so that the coating thickness after drying was 6μ, and after orientation by applying a magnetic field, it was heated and dried to obtain a magnetic tape. When we measured the properties of the obtained magnetic tape, we found that the saturation magnetic flux density (Bm) was 1550 Gauss (without calendering; all values below are without calendering), and the squareness ratio (Br/Bm)
was 0.83, and coercive force (Hc) was 368 Oe, both of which were good. The data obtained when the amount of the aluminum alcoholate compound added was varied is shown in the table below. Comparative Example A magnetic tape was manufactured using magnetic powder treated in the same manner as in the above example, using 5 parts by weight of crude soybean lecithin in place of the aluminum alcoholate compound in the above example. The properties of the obtained magnetic tape include a saturation magnetic flux density (Bm) of 1210 Gauss, a squareness ratio (Br/Bm) of 0.81, and a coercive force (Hc) of 352 Oe.
It was hot. The table below shows a comparison of the data of the above examples and comparative examples, and it can be seen that both Bm and Rs are improved in this example.
【表】【table】
Claims (1)
ずれも炭素数１から10までの炭化水素基を意味
し、R3は炭素数５から25までの炭化水素基を意
味する。） で表わされるアルミニウムアルコラート化合物で
処理されていることを特徴とする磁気記録媒体。[Claims] 1. The magnetic particles have the general formula: (In the formula, R 1 and R 2 are the same or different and each means a hydrocarbon group having 1 to 10 carbon atoms, and R 3 means a hydrocarbon group having 5 to 25 carbon atoms. ) A magnetic recording medium characterized in that it is treated with an aluminum alcoholate compound represented by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56019797A JPS57135438A (en) | 1981-02-13 | 1981-02-13 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56019797A JPS57135438A (en) | 1981-02-13 | 1981-02-13 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57135438A JPS57135438A (en) | 1982-08-21 |
| JPS6216451B2 true JPS6216451B2 (en) | 1987-04-13 |
Family
ID=12009332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56019797A Granted JPS57135438A (en) | 1981-02-13 | 1981-02-13 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57135438A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112019006224T5 (en) | 2019-02-28 | 2021-10-14 | Hitachi High-Tech Corporation | Electrophoresis device capable of performing electrophoresis on multiple samples independently |
-
1981
- 1981-02-13 JP JP56019797A patent/JPS57135438A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112019006224T5 (en) | 2019-02-28 | 2021-10-14 | Hitachi High-Tech Corporation | Electrophoresis device capable of performing electrophoresis on multiple samples independently |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57135438A (en) | 1982-08-21 |
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