JPH04302820A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04302820A JPH04302820A JP9154991A JP9154991A JPH04302820A JP H04302820 A JPH04302820 A JP H04302820A JP 9154991 A JP9154991 A JP 9154991A JP 9154991 A JP9154991 A JP 9154991A JP H04302820 A JPH04302820 A JP H04302820A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- weight
- parts
- acid
- fine particles
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 115
- 239000006247 magnetic powder Substances 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims abstract description 6
- 150000007524 organic acids Chemical class 0.000 claims description 11
- 150000002828 nitro derivatives Chemical class 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 56
- 229910052742 iron Inorganic materials 0.000 abstract description 29
- 230000005294 ferromagnetic effect Effects 0.000 abstract description 24
- 238000000576 coating method Methods 0.000 abstract description 14
- 230000006866 deterioration Effects 0.000 abstract description 13
- 239000011248 coating agent Substances 0.000 abstract description 12
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002253 acid Substances 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 abstract description 4
- 239000002904 solvent Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 239000013528 metallic particle Substances 0.000 abstract 2
- 239000010419 fine particle Substances 0.000 description 40
- 229910052751 metal Inorganic materials 0.000 description 38
- 239000002184 metal Substances 0.000 description 37
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 27
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 24
- 239000003973 paint Substances 0.000 description 23
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 18
- 239000000126 substance Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- 239000000843 powder Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 13
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 12
- 150000001875 compounds Chemical class 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- -1 3,4,6-trinitrophthalic acid Chemical compound 0.000 description 9
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 9
- 229920005749 polyurethane resin Polymers 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000006249 magnetic particle Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 235000005985 organic acids Nutrition 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- XJNPNXSISMKQEX-UHFFFAOYSA-N 4-nitrocatechol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1O XJNPNXSISMKQEX-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-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
- 235000019647 acidic taste Nutrition 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- MKWJZTFMDWSRIH-UHFFFAOYSA-N (4-fluoro-3-nitrophenyl)methanol Chemical compound OCC1=CC=C(F)C([N+]([O-])=O)=C1 MKWJZTFMDWSRIH-UHFFFAOYSA-N 0.000 description 2
- ZUWVFOJZGCLEKC-UHFFFAOYSA-N 4,5-dinitrobenzene-1,2-diol Chemical compound OC1=CC([N+]([O-])=O)=C([N+]([O-])=O)C=C1O ZUWVFOJZGCLEKC-UHFFFAOYSA-N 0.000 description 2
- OMVRRHJJQILIJX-UHFFFAOYSA-N 528-45-0 Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C([N+]([O-])=O)=C1 OMVRRHJJQILIJX-UHFFFAOYSA-N 0.000 description 2
- ZIIGSRYPZWDGBT-UHFFFAOYSA-N 610-30-0 Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O ZIIGSRYPZWDGBT-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920001747 Cellulose diacetate Polymers 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- 229910017061 Fe Co Inorganic materials 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 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
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 239000004640 Melamine resin Substances 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 239000003082 abrasive agent Substances 0.000 description 2
- 229910052783 alkali metal Chemical group 0.000 description 2
- 150000001340 alkali metals Chemical group 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- QXYJCZRRLLQGCR-UHFFFAOYSA-N dioxomolybdenum Chemical compound O=[Mo]=O QXYJCZRRLLQGCR-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229910021519 iron(III) oxide-hydroxide Inorganic materials 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 150000002513 isocyanates Chemical class 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000006224 matting agent Substances 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical class [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 2
- 150000003014 phosphoric acid esters Chemical class 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 229910001887 tin oxide Inorganic materials 0.000 description 2
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(II) oxide Inorganic materials [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- BHHYHSUAOQUXJK-UHFFFAOYSA-L zinc fluoride Chemical compound F[Zn]F BHHYHSUAOQUXJK-UHFFFAOYSA-L 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- DLGLAVURKVINHN-UHFFFAOYSA-N 2,3,4-trinitrobenzoic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C([N+]([O-])=O)=C1[N+]([O-])=O DLGLAVURKVINHN-UHFFFAOYSA-N 0.000 description 1
- VOLVLEHPHPTLBT-UHFFFAOYSA-N 2,3,5-trinitrobenzoic acid Chemical compound OC(=O)C1=CC([N+]([O-])=O)=CC([N+]([O-])=O)=C1[N+]([O-])=O VOLVLEHPHPTLBT-UHFFFAOYSA-N 0.000 description 1
- HCSBTDBGTNZOAB-UHFFFAOYSA-N 2,3-dinitrobenzoic acid Chemical compound OC(=O)C1=CC=CC([N+]([O-])=O)=C1[N+]([O-])=O HCSBTDBGTNZOAB-UHFFFAOYSA-N 0.000 description 1
- VCBRYYAFVLDIHK-UHFFFAOYSA-N 2-chloro-n-[4-chloro-2-(2-chlorobenzoyl)phenyl]acetamide Chemical compound ClCC(=O)NC1=CC=C(Cl)C=C1C(=O)C1=CC=CC=C1Cl VCBRYYAFVLDIHK-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- HXDLWJWIAHWIKI-UHFFFAOYSA-N 2-hydroxyethyl acetate Chemical compound CC(=O)OCCO HXDLWJWIAHWIKI-UHFFFAOYSA-N 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- SLAMLWHELXOEJZ-UHFFFAOYSA-N 2-nitrobenzoic acid Chemical compound OC(=O)C1=CC=CC=C1[N+]([O-])=O SLAMLWHELXOEJZ-UHFFFAOYSA-N 0.000 description 1
- NYZQQLVKJQGAPT-UHFFFAOYSA-N 3,4-dinitro-1,2-benzenedicarboxylic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C([N+]([O-])=O)=C1C(O)=O NYZQQLVKJQGAPT-UHFFFAOYSA-N 0.000 description 1
- POYFAWOYINUXAW-UHFFFAOYSA-N 3,5-dinitrophthalic acid Chemical compound OC(=O)C1=CC([N+]([O-])=O)=CC([N+]([O-])=O)=C1C(O)=O POYFAWOYINUXAW-UHFFFAOYSA-N 0.000 description 1
- MZDSOZBFTCRKNT-UHFFFAOYSA-N 3,6-dinitrophthalic acid Chemical compound OC(=O)C1=C(C(O)=O)C([N+]([O-])=O)=CC=C1[N+]([O-])=O MZDSOZBFTCRKNT-UHFFFAOYSA-N 0.000 description 1
- AFPHTEQTJZKQAQ-UHFFFAOYSA-N 3-nitrobenzoic acid Chemical compound OC(=O)C1=CC=CC([N+]([O-])=O)=C1 AFPHTEQTJZKQAQ-UHFFFAOYSA-N 0.000 description 1
- KFIRODWJCYBBHY-UHFFFAOYSA-N 3-nitrophthalic acid Chemical compound OC(=O)C1=CC=CC([N+]([O-])=O)=C1C(O)=O KFIRODWJCYBBHY-UHFFFAOYSA-N 0.000 description 1
- OTLNPYWUJOZPPA-UHFFFAOYSA-N 4-nitrobenzoic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C=C1 OTLNPYWUJOZPPA-UHFFFAOYSA-N 0.000 description 1
- SLBQXWXKPNIVSQ-UHFFFAOYSA-N 4-nitrophthalic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C=C1C(O)=O SLBQXWXKPNIVSQ-UHFFFAOYSA-N 0.000 description 1
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- DQEFEBPAPFSJLV-UHFFFAOYSA-N Cellulose propionate Chemical compound CCC(=O)OCC1OC(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C1OC1C(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C(COC(=O)CC)O1 DQEFEBPAPFSJLV-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910020674 Co—B Inorganic materials 0.000 description 1
- 229910020516 Co—V Inorganic materials 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 229910017086 Fe-M Inorganic materials 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- CTKINSOISVBQLD-UHFFFAOYSA-N Glycidol Chemical compound OCC1CO1 CTKINSOISVBQLD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229910018104 Ni-P Inorganic materials 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910018536 Ni—P Inorganic materials 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol 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
- ULUAUXLGCMPNKK-UHFFFAOYSA-N Sulfobutanedioic acid Chemical class OC(=O)CC(C(O)=O)S(O)(=O)=O ULUAUXLGCMPNKK-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
- CUPCBVUMRUSXIU-UHFFFAOYSA-N [Fe].OOO Chemical compound [Fe].OOO CUPCBVUMRUSXIU-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000007754 air knife coating Methods 0.000 description 1
- 239000005456 alcohol based solvent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000008051 alkyl sulfates Chemical class 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000002635 aromatic organic solvent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 229910052796 boron Inorganic materials 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
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 229920006218 cellulose propionate Polymers 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229940117389 dichlorobenzene Drugs 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000007759 kiss coating Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000002156 mixing Methods 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
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002647 polyamide 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
- 229920006267 polyester film Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 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
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 1
- 238000007763 reverse roll coating Methods 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical class NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は磁性粉末として強磁性金
属微粒子を用いた塗布型の磁気記録媒体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating type magnetic recording medium using fine ferromagnetic metal particles as magnetic powder.
【０００２】0002
【従来の技術】一般に磁気テープ等の磁気記録媒体は、
磁性粉末や結合剤からなる磁性塗料を非磁性支持体上に
塗布、乾燥することにより製造される。近年、磁気記録
の分野、特にビデオテープレコーダ等においては高画質
化を図るために、より一層の高記録密度化が要求されて
いる。この高記録密度化に伴い、従来より磁気記録媒体
等の磁性粉末として使用されていた酸化鉄系材料に代わ
り、鉄または鉄を主体とする金属磁性材料が用いられる
ようになっている。これらの鉄または鉄から構成される
強磁性金属微粒子は、酸化鉄やオキシ水酸化鉄、あるい
はＣｏ，Ｎｉ，Ｍｎ，Ｃｕ，Ｚｎ，Ｔｉ，Ｖ等の鉄以外
の金属を含む酸化鉄やオキシ水酸化鉄等を水素ガスで還
元することにより製造される。これらの強磁性金属微粒
子は、従来の酸化鉄系の強磁性微粒子よりも優れた磁気
特性を有している。[Prior Art] Generally, magnetic recording media such as magnetic tape are
It is manufactured by applying a magnetic paint consisting of magnetic powder and a binder onto a non-magnetic support and drying it. In recent years, in the field of magnetic recording, particularly in video tape recorders and the like, there has been a demand for even higher recording densities in order to achieve higher image quality. With this increase in recording density, iron or metallic magnetic materials mainly composed of iron have come to be used in place of iron oxide-based materials conventionally used as magnetic powders in magnetic recording media and the like. These ferromagnetic metal fine particles composed of iron or iron are iron oxide or iron oxyhydroxide, or iron oxide or oxyhydroxide containing metals other than iron such as Co, Ni, Mn, Cu, Zn, Ti, and V. Manufactured by reducing iron oxide etc. with hydrogen gas. These ferromagnetic metal fine particles have better magnetic properties than conventional iron oxide-based ferromagnetic particles.
【０００３】ところが、上記強磁性金属微粒子は表面活
性が高く、大気中で酸化され易い特性を有しており、場
合によっては発火を伴う恐れがある。このような性質は
磁気記録媒体の低ノイズ化に伴って磁性粉末の微細化が
進められるに従い、ますます強くなる傾向がある。この
ために、上記強磁性金属微粒子を磁気記録媒体の磁性粉
末として用いた場合には、強磁性金属微粒子の保存中、
あるいは結合剤や有機溶剤等との組み合わせによる塗料
化の行程中、さらにはポリエステルフィルム等の非磁性
支持体上に塗布してシート化した後、所定の雰囲気や温
度、湿度等の条件下での保管中に、主として酸素やある
種のガス及び水分等の影響による酸化が進行して、飽和
磁化等の磁気特性に経時劣化がもたらされ、保存安定性
に問題があった。この問題に対して、強磁性金属微粒子
の表面の安定化を図るために、一般的には液相法、また
は気相法で粒子の表面に酸化皮膜を形成して不動態化さ
せる方法がとられてきた。また、強磁性金属微粒子のあ
る種の金属元素や界面活性剤、樹脂等の有機物で覆う方
法等もとられてきた。However, the above-mentioned ferromagnetic metal fine particles have a high surface activity and are easily oxidized in the atmosphere, which may cause ignition in some cases. Such properties tend to become stronger as magnetic powder becomes finer as noise is reduced in magnetic recording media. For this reason, when the above-mentioned ferromagnetic metal fine particles are used as magnetic powder for a magnetic recording medium, during storage of the ferromagnetic metal fine particles,
Alternatively, during the process of forming a paint by combining it with a binder, organic solvent, etc., or after coating it on a non-magnetic support such as a polyester film to form a sheet, it is applied under specified conditions such as atmosphere, temperature, humidity, etc. During storage, oxidation progresses mainly due to the influence of oxygen, certain gases, moisture, etc., resulting in deterioration of magnetic properties such as saturation magnetization over time, resulting in storage stability problems. To solve this problem, in order to stabilize the surface of ferromagnetic metal fine particles, a method is generally used to form an oxide film on the particle surface using a liquid phase method or a gas phase method to passivate it. I've been exposed to it. In addition, methods have been taken in which ferromagnetic metal fine particles are coated with certain metal elements, surfactants, organic substances such as resins, and the like.
【０００４】0004
【本発明が解決しようとする課題】しかしながら、前述
の酸化皮膜不動態を形成する方法やある種の金属元素や
有機物で覆う方法では、強磁性金属微粒子の酸化を抑え
、磁気特性の経時劣化を防ぐ上で必ずしも十分なものと
は言い難い。また、処理の方法によっては、逆に表面処
理すること自体が磁気特性の劣化をもたらす場合や、塗
料化の際の分散性の低下をきたす虞がある。そこで、本
発明はこのような実状に鑑みて提案されたものであり、
磁気記録媒体の経時的安定性を高め、保存安定性に優れ
た磁気記録媒体を提供することを目的とする。[Problems to be Solved by the Invention] However, with the method of forming a passive oxide film or the method of covering with a certain metal element or organic substance, it is difficult to suppress oxidation of ferromagnetic metal particles and prevent deterioration of magnetic properties over time. It is difficult to say that it is necessarily sufficient to prevent such problems. Furthermore, depending on the treatment method, surface treatment itself may cause deterioration of magnetic properties or may cause a decrease in dispersibility when made into a paint. Therefore, the present invention has been proposed in view of these actual circumstances.
The purpose of the present invention is to improve the stability of a magnetic recording medium over time and provide a magnetic recording medium with excellent storage stability.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、上記の目
的を達成せんものと鋭意研究の結果、磁性層中にベンゼ
ン骨格を有する有機酸のニトロ誘導体を含有させると、
媒体としての耐酸化性が向上し、磁気特性の経時劣化を
抑えることができることを見出し、本発明を完成するに
至ったものである。即ち、本発明は非磁性支持体上に磁
性粉末と結合剤とを主体とする磁性層が形成されてなる
磁気記録媒体において、上記磁性層にベンゼン骨格を有
する有機酸のニトロ誘導体を含むことを特徴とするもの
である。本発明において使用される磁性粉末としては、
Ｆｅ，Ｃｏ，Ｎｉ等の強磁性金属材料や、Ｆｅ−Ｃｏ，
Ｆｅ−Ｎｉ，Ｆｅ−Ｃｏ−Ｎｉ，Ｃｏ−Ｎｉ，Ｆｅ−Ｍ
ｎ−Ｚｎ，Ｆｅ−Ｎｉ−Ｚｎ，Ｆｅ−Ｃｏ−Ｎｉ−Ｃｒ
，Ｆｅ−Ｃｏ−Ｎｉ−Ｐ，Ｆｅ−Ｃｏ−Ｂ，Ｆｅ−Ｃｏ
−Ｃｒ−Ｂ，Ｆｅ−Ｃｏ−Ｖ等のＦｅ，Ｃｏ，Ｎｉを主
成分とする各種強磁性合金材料からなる強磁性金属微粒
子であり、更にこれらの種々の特性を改善する目的でＡ
ｌ，Ｓｉ，Ｔｉ，Ｃｒ，Ｍｎ，Ｃｕ，Ｚｎ，Ｍｇ，Ｐ等
の元素が添加されたものであっても良い。これら強磁性
金属微粒子の比表面積は任意であるが、比表面積２５ｍ
２／ｇ以上、特に３０ｍ２ ／ｇ以上のものに適用した
場合の有効性が大きい。[Means for Solving the Problems] As a result of intensive research, the present inventors found that the above object could not be achieved by including a nitro derivative of an organic acid having a benzene skeleton in the magnetic layer.
It was discovered that the oxidation resistance as a medium is improved and deterioration of magnetic properties over time can be suppressed, leading to the completion of the present invention. That is, the present invention provides a magnetic recording medium in which a magnetic layer mainly composed of magnetic powder and a binder is formed on a non-magnetic support, in which the magnetic layer contains a nitro derivative of an organic acid having a benzene skeleton. This is a characteristic feature. The magnetic powder used in the present invention includes:
Ferromagnetic metal materials such as Fe, Co, Ni, Fe-Co,
Fe-Ni, Fe-Co-Ni, Co-Ni, Fe-M
n-Zn, Fe-Ni-Zn, Fe-Co-Ni-Cr
, Fe-Co-Ni-P, Fe-Co-B, Fe-Co
-Ferromagnetic metal fine particles made of various ferromagnetic alloy materials mainly composed of Fe, Co, and Ni such as -Cr-B and Fe-Co-V.
Elements such as L, Si, Ti, Cr, Mn, Cu, Zn, Mg, and P may be added. The specific surface area of these ferromagnetic metal fine particles is arbitrary, but the specific surface area is 25 m
It is highly effective when applied to objects with a surface area of 2/g or more, especially 30 m2/g or more.
【０００６】このような強磁性金属微粒子をもってなる
本発明の磁気記録媒体は、その磁性層中にナフタレン骨
格を有する有機酸のニトロ誘導体を含有する。これら化
合物は塗料化に際して添加されているが、もちろん予め
これら化合物を含む水あるいは有機溶媒中で処理された
強磁性金属微粒子を用いても良い。また、これら化合物
は単独で使用しても良いし、異なる種類の化合物を組み
合わせて使用しても良い。上記有機酸としては、酸基が
水酸基の場合には、下記の化１乃至化１７に示すような
化合物があげられる。The magnetic recording medium of the present invention comprising such ferromagnetic metal fine particles contains a nitro derivative of an organic acid having a naphthalene skeleton in its magnetic layer. Although these compounds are added when forming a paint, it is also possible to use ferromagnetic metal fine particles that have been previously treated in water or an organic solvent containing these compounds. Further, these compounds may be used alone or in combination with different types of compounds. When the acid group is a hydroxyl group, examples of the organic acid include compounds shown in the following chemical formulas 1 to 17.
【化１】[Chemical formula 1]
【０００７】[0007]
【化２】[Case 2]
【０００８】[0008]
【化３】[Chemical formula 3]
【０００９】[0009]
【化４】[C4]
【００１０】0010
【化５】[C5]
【００１１】[0011]
【化６】[C6]
【００１２】0012
【化７】[C7]
【００１３】[0013]
【化８】[Chemical formula 8]
【００１４】[0014]
【化９】[Chemical formula 9]
【００１５】[0015]
【化１０】[Chemical formula 10]
【００１６】[0016]
【化１１】[Chemical formula 11]
【００１７】[0017]
【化１２】[Chemical formula 12]
【００１８】[0018]
【化１３】[Chemical formula 13]
【００１９】[0019]
【化１４】[Chemical formula 14]
【００２０】[0020]
【化１５】[Chemical formula 15]
【００２１】[0021]
【化１６】[Chemical formula 16]
【００２２】[0022]
【化１７】[Chemical formula 17]
【００２３】酸の官能基がカルボキシル基の場合には、
２−ニトロ安息香酸、３−ニトロ安息香酸、４−ニトロ
安息香酸、２，３−ジニトロ安息香酸、２，４−ジニト
ロ安息香酸、２，４−ジニトロ安息香酸、２，３，４−
トリニトロ安息香酸、２，３，５−トリニトロ安息香酸
、３−ニトロフタル酸、４−ニトロフタル酸、３，４−
ジニトロフタル酸、４，５−ジニトロフタル酸、３，５
−ジニトロフタル酸、３，６−ジニトロフタル酸、３，
４，５−トリニトロフタル酸、３，４，６−トリニトロ
フタル酸、３，４，５，６−テトラニトロフタル酸等の
化合物があげられる。また、これら化合物は塗料化に際
しての分散性の要求に応じて、メチル基、エチル等のア
ルキル基、フッ素、塩素等のハロゲン基、アミノ基、ア
セチル基等を有していてもかまわない。周知の如く、カ
テコールや安息香酸、フタル酸に電子吸引性のニトロ基
を導入することは、これら有機酸の酸性度の向上をもた
らし、置換基の個数と置換位置により母体有機酸の酸性
度をコントロールでき、磁性粉末の表面物性に応じて種
々の酸性度の有機酸を使い分けることが可能である。When the functional group of the acid is a carboxyl group,
2-nitrobenzoic acid, 3-nitrobenzoic acid, 4-nitrobenzoic acid, 2,3-dinitrobenzoic acid, 2,4-dinitrobenzoic acid, 2,4-dinitrobenzoic acid, 2,3,4-
Trinitrobenzoic acid, 2,3,5-trinitrobenzoic acid, 3-nitrophthalic acid, 4-nitrophthalic acid, 3,4-
Dinitrophthalic acid, 4,5-dinitrophthalic acid, 3,5
-dinitrophthalic acid, 3,6-dinitrophthalic acid, 3,
Examples include compounds such as 4,5-trinitrophthalic acid, 3,4,6-trinitrophthalic acid, and 3,4,5,6-tetranitrophthalic acid. Further, these compounds may have an alkyl group such as a methyl group or ethyl, a halogen group such as fluorine or chlorine, an amino group, an acetyl group, etc., depending on the dispersibility required when forming a paint. As is well known, introducing an electron-withdrawing nitro group into catechol, benzoic acid, and phthalic acid improves the acidity of these organic acids, and the acidity of the parent organic acid can be adjusted depending on the number and position of substituents. This can be controlled, and organic acids with various acidities can be used depending on the surface properties of the magnetic powder.
【００２４】上記化合物を用いる方法として、強磁性金
属微粒子の表面に上記化合物を被着させる場合には、水
及びアルコール系、ケトン系、芳香族系有機溶媒中で強
磁性金属微粒子を予め処理する方法、あるいは磁性塗料
作製工程中に磁性塗料中に添加する方法がある。上記化
合物の使用量は、上記強磁性金属微粒子１００重量部に
対して０．０３〜３０重量部、好ましくは０．１〜１０
重量部である。上記範囲外で少量の場合は有効な耐酸化
性が得られず、また上記範囲外で多量の場合はその効果
は変わらず、過剰分が無駄になり、磁気記録媒体の磁性
塗膜の物性に悪影響を及ぼす虞がある。本発明において
は、上記強磁性金属微粒子と上記化合物とを結合剤や有
機溶剤、各種添加剤と共に混練して塗料化し、非磁性支
持体上に塗布することにより磁気記録媒体が得られる。
この場合、これら有機酸は、別途、強磁性金属微粒子の
表面処理剤として用いられても良いし、塗料化に際して
加えられても良い。結合剤や有機溶剤、各種添加剤とし
ては、通常の磁気記録媒体に用いられるものがいずれも
使用可能である。また、この場合、混合比等も通常の磁
気記録媒体の場合に準じて設定される。[0024] As a method of using the above compound, when the above compound is deposited on the surface of ferromagnetic metal fine particles, the ferromagnetic metal fine particles are pretreated in water and an alcohol-based, ketone-based, or aromatic organic solvent. Alternatively, there is a method of adding it to the magnetic paint during the process of producing the magnetic paint. The amount of the compound used is 0.03 to 30 parts by weight, preferably 0.1 to 10 parts by weight, based on 100 parts by weight of the ferromagnetic metal fine particles.
Parts by weight. If the amount is outside the above range and the amount is small, effective oxidation resistance cannot be obtained, and if the amount is outside the above range and is large, the effect will not change and the excess amount will be wasted and the physical properties of the magnetic coating film of the magnetic recording medium will be affected. There is a risk of adverse effects. In the present invention, a magnetic recording medium is obtained by kneading the above-mentioned ferromagnetic metal fine particles and the above-mentioned compound together with a binder, an organic solvent, and various additives to form a paint, and coating the paint on a non-magnetic support. In this case, these organic acids may be used separately as a surface treatment agent for the ferromagnetic metal fine particles, or may be added when forming the paint. As the binder, organic solvent, and various additives, any of those used in ordinary magnetic recording media can be used. Further, in this case, the mixing ratio and the like are also set in accordance with the case of a normal magnetic recording medium.
【００２５】上記磁性層に使用可能な結合剤としては、
平均分子量が１００００〜２０００００のものがよく、
例えば塩化ビニル−酢酸ビニル共重合体、塩化ビニル−
塩化ビニリデン共重合体、塩化ビニル−酢酸ビニル−ポ
リビニルアルコール共重合体、塩化ビニル−アクリロニ
トリル共重合体、ポリウレタン樹脂、ブタジエン−アク
リロニトリル共重合体、ポリアミド樹脂、ポリビニルブ
チラール、セルロース誘導体（セルロースアセテートブ
チレート、セルロースダイアセテート、セルローストリ
アセテート、セルロースプロピオネート、ニトロセルロ
ース等）、スチレン−ブタジエン共重合体、ポリエステ
ル樹脂、各種の合成ゴム系、フェノール樹脂、エポキシ
樹脂、尿素樹脂、メラミン樹脂、フェノキシ樹脂、シリ
コン樹脂、アクリル系樹脂、高分子量ポリエステル樹脂
とイソシアネートプレポリマーの混合物、ポリエステル
ポリオールとポリイソシアネ−トの混合物、尿素ホルム
アルデヒド樹脂、低分子量グリコールと高分子量ジオー
ルとイソシアネートの混合物、及び、これらの混合物等
が例示される。これらの結合剤は、−ＳＯ３ Ｍ，−Ｃ
ＯＯＭ，−ＰＯ（ＯＭ’）２ （但しＭは水素、又は、
リチウム、カリウム、ナトリウム等のアルカリ金属、Ｍ
’は水素、リチウム、カリウム、ナトリウム等のアルカ
リ金属または炭化水素残基）等の親水性極性基を含有し
た樹脂であるのが望ましい。即ちこのような樹脂はその
分子内の極性基によって磁性粉末とのなじみが向上し、
これによって磁性粉末同志の凝集が抑えられることから
磁性粉末の分散安定性を増し、ひいては媒体としての耐
久性も向上させ得る。また、上記結合剤のうち、塩化ビ
ニル系の共重合体は、塩化ビニルモノマー、スルホン酸
もしくはリン酸アルカリ塩を含有した共重合性モノマー
及び必要に応じて他の種々の共重合性モノマーをビニル
重合により共重合させて容易に得ることができる。これ
により共重合体の極性を任意にコントロールし、粒子の
分散安定性を図ることが可能である。Binders that can be used in the magnetic layer include:
Those with an average molecular weight of 10,000 to 200,000 are preferred;
For example, vinyl chloride-vinyl acetate copolymer, vinyl chloride-
Vinylidene chloride copolymer, vinyl chloride-vinyl acetate-polyvinyl alcohol copolymer, vinyl chloride-acrylonitrile copolymer, polyurethane resin, butadiene-acrylonitrile copolymer, polyamide resin, polyvinyl butyral, cellulose derivative (cellulose acetate butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, nitrocellulose, etc.), styrene-butadiene copolymer, polyester resin, various synthetic rubbers, phenolic resin, epoxy resin, urea resin, melamine resin, phenoxy resin, silicone resin , acrylic resins, mixtures of high molecular weight polyester resins and isocyanate prepolymers, mixtures of polyester polyols and polyisocyanates, urea formaldehyde resins, mixtures of low molecular weight glycols, high molecular weight diols and isocyanates, and mixtures thereof. Ru. These binders are -SO3 M, -C
OOM, -PO(OM')2 (where M is hydrogen or
Alkali metals such as lithium, potassium, sodium, M
' is preferably a resin containing a hydrophilic polar group such as hydrogen, an alkali metal such as lithium, potassium, or sodium, or a hydrocarbon residue). In other words, such resins have improved compatibility with magnetic powder due to the polar groups in their molecules,
This suppresses agglomeration of the magnetic powders, thereby increasing the dispersion stability of the magnetic powders and, in turn, improving the durability of the medium. Among the binders mentioned above, vinyl chloride-based copolymers are vinyl chloride monomers, copolymerizable monomers containing sulfonic acid or alkali phosphate salts, and various other copolymerizable monomers as necessary. It can be easily obtained by copolymerization. This makes it possible to arbitrarily control the polarity of the copolymer and improve the dispersion stability of the particles.
【００２６】上記磁性層を形成するのに使用される磁性
塗料には分散剤が使用され、また必要に応じ潤滑剤、研
摩剤、マット剤、帯電防止剤等の添加剤を含有させてよ
い。本発明に使用される分散剤としては、燐酸エステル
、アミン化合物、アルキルサルフェート、脂肪酸アミド
、高級アルコール、ポリエチレンオキサイド、スルホ琥
珀酸、スルホ琥珀酸エステル、公知の界面活性剤等及び
これらの塩があり、また、陰性有機酸（例えば−ＣＯＯ
Ｈ）を有する重合体分散剤の塩を使用することも出来る
。これら分散剤は１種類のみで用いても、或いは２種類
以上を併用してもよい。また、潤滑剤としては、シリコ
ーンオイル、グラファイト、カーボンブラックグラファ
イトポリマ、二硫化モリブデン、二硫化タングステン、
ラウリン酸、ミリスチン酸、炭素原子数１２〜１６の脂
肪酸と該脂肪酸の炭素原子数と合計して炭素原子数２１
〜２３個の一価アルコールから成る脂肪酸エステル等も
使用できる。これらの潤滑剤はバインダー１００重量部
に対して、通常、０．２〜２０重量部の範囲で添加され
る。研摩剤としては、一般に使用される材料で溶融アル
ミナ、αアルミナ等の各種アルミナ、炭化珪素、酸化ク
ロム、コランダム、人造コランダム、人造ダイヤモンド
、ざくろ石、エメリ等が使用される。これらの研摩剤は
平均粒子径０．０５〜５μｍの大きさのものが使用され
、特に好ましくは０．１〜２μｍである。これらの研摩
剤は結合剤１００重量部に対して、通常、１〜２０重量
部の範囲で添加される。マット剤としては、有機質粉末
或いは無機質粉末をそれぞれに或いは混合して用いられ
る。本発明に用いられる有機質粉末としては、アクリル
スチレン系樹脂粉末、ベンゾグアナミン系樹脂粉末、メ
ラミン系樹脂粉末、フタロシアニン系顔料が好ましいが
、ポリオレフィン系樹脂粉末、ポリエステル系樹脂粉末
、ポリアミド系樹脂粉末、ポリイミド系樹脂粉末、ポリ
弗化エチレン樹脂粉末等も使用でき、無機質粉末として
は酸化珪素、酸化チタン、酸化アルミニウム、炭酸カル
シウム、硫酸バリウム、酸化亜鉛、酸化錫、酸化クロム
、炭化珪素、酸化鉄、タルク、カオリン、硫酸カルシウ
ム、窒化ホウ素、弗化亜鉛、二酸化モリブデンが挙げら
れる。帯電防止剤としては、カーボンブラックをはじめ
、グラファイト、酸化錫一酸化アンチモン系化合物、酸
化チタン一酸化錫一酸化アンチモン系化合物などの導電
性粉末、サポニンなどの天然界面活性剤、アルキレンオ
キサイド系、グリセリン系、グリシドール系などのノニ
オン界面活性剤、高級アルキルアミン、第４級アンモニ
ウム塩類、ピリジン、その他の複素環類、ホスホニウム
またはスルホニウム類などのカチオン界面活性剤、カル
ボン酸、スルホン酸、燐酸、硫酸エステル基等の酸性基
を含むアニオン界面活性剤、アミノ酸類、アミノスルホ
ン酸類、アミノアルコールの硫酸または燐酸エステル類
等の両性活性剤などがあげられる。A dispersant is used in the magnetic paint used to form the magnetic layer, and additives such as a lubricant, an abrasive, a matting agent, an antistatic agent, etc. may be included as necessary. Dispersants used in the present invention include phosphoric acid esters, amine compounds, alkyl sulfates, fatty acid amides, higher alcohols, polyethylene oxides, sulfosuccinic acids, sulfosuccinic esters, known surfactants, and salts thereof. , and also negative organic acids (e.g. -COO
It is also possible to use salts of polymeric dispersants having H). These dispersants may be used alone or in combination of two or more. In addition, as lubricants, silicone oil, graphite, carbon black graphite polymer, molybdenum disulfide, tungsten disulfide,
Lauric acid, myristic acid, fatty acids having 12 to 16 carbon atoms, and the total number of carbon atoms in the fatty acids is 21
Fatty acid esters consisting of ~23 monohydric alcohols can also be used. These lubricants are usually added in an amount of 0.2 to 20 parts by weight per 100 parts by weight of the binder. As the abrasive, commonly used materials such as fused alumina, various types of alumina such as α-alumina, silicon carbide, chromium oxide, corundum, artificial corundum, artificial diamond, garnet, emery, etc. are used. These abrasives have an average particle diameter of 0.05 to 5 μm, particularly preferably 0.1 to 2 μm. These abrasives are usually added in an amount of 1 to 20 parts by weight per 100 parts by weight of the binder. As the matting agent, organic powder or inorganic powder can be used individually or in combination. As the organic powder used in the present invention, acrylic styrene resin powder, benzoguanamine resin powder, melamine resin powder, and phthalocyanine pigment are preferable, but polyolefin resin powder, polyester resin powder, polyamide resin powder, and polyimide resin powder are preferable. Resin powder, polyfluoroethylene resin powder, etc. can also be used, and inorganic powders include silicon oxide, titanium oxide, aluminum oxide, calcium carbonate, barium sulfate, zinc oxide, tin oxide, chromium oxide, silicon carbide, iron oxide, talc, Examples include kaolin, calcium sulfate, boron nitride, zinc fluoride, and molybdenum dioxide. Antistatic agents include carbon black, graphite, conductive powders such as tin oxide and antimony monoxide compounds, titanium oxide and tin monoxide and antimony monoxide compounds, natural surfactants such as saponin, alkylene oxides, and glycerin. nonionic surfactants such as glycidol-based, higher alkylamines, quaternary ammonium salts, pyridine, other heterocycles, cationic surfactants such as phosphonium or sulfonium, carboxylic acids, sulfonic acids, phosphoric acids, and sulfuric esters. Examples include anionic surfactants containing acidic groups, such as amino acids, amino sulfonic acids, and amphoteric surfactants such as sulfuric acid or phosphoric acid esters of amino alcohols.
【００２７】上記磁性塗料に配合される溶媒或いはこの
磁性塗料の塗布時の希釈溶剤としては、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
サノン等のケトン類、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類、酢酸メチル、酢
酸エチル、酢酸ブチル、乳酸エチル、エチレングリコー
ルモノアセテート等のエステル類、グリコールジメチル
エーテル、グリコールモノエチルエーテル、ジオキサン
、テトラヒドロフラン等のエーテル類、ベンゼン、トル
エン、キシレン等の芳香族炭化水素、メチレンクロライ
ド、エチレンクロライド、四塩化炭素、クロロホルム、
ジクロルベンゼン等のハロゲン化炭化水素等のものが使
用できる。また、非磁性支持体としては、ポリエチレン
テレフタレート、ポリエチレン−２，６−ナフタレート
等のポリエステル類、ポリプロピレン等のポリオレフィ
ン類、セルローストリアセテート、セルロースダイアセ
テート等のセルロース誘導体、ポリアミド、ポリカーボ
ネートなどのプラスチックが挙げられるが、銅、アルミ
ニウム、亜鉛等の金属、ガラス、窒化ホウ素、炭化珪素
等のセラミクスなども使用できる。[0027] As the solvent to be added to the magnetic paint or the diluting solvent when applying the magnetic paint, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, alcohols such as methanol, ethanol, propanol, and butanol, Esters such as methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, ethylene glycol monoacetate, ethers such as glycol dimethyl ether, glycol monoethyl ether, dioxane, tetrahydrofuran, aromatic hydrocarbons such as benzene, toluene, xylene, methylene Chloride, ethylene chloride, carbon tetrachloride, chloroform,
Halogenated hydrocarbons such as dichlorobenzene can be used. Examples of non-magnetic supports include polyesters such as polyethylene terephthalate and polyethylene-2,6-naphthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate and cellulose diacetate, and plastics such as polyamide and polycarbonate. However, metals such as copper, aluminum, and zinc, glass, and ceramics such as boron nitride and silicon carbide can also be used.
【００２８】これらの非磁性支持体の厚みはフィルム、
シート状の場合は約３〜１００μｍ程度、好ましくは５
〜５０μｍであり、ディスク、カード状の場合は３０μ
ｍ〜１０ｍｍ程度であり、ドラム状の場合は円筒状で用
いられ、使用するレコーダに応じてその型は決められる
。この非磁性支持体と磁性層の中間には接着性を向上さ
せる中間層を設けてもよい。非磁性支持体上に上記磁性
層を形成するための塗布方法としては、エアードクター
コート、ブレードコート、エアーナイフコート、スクィ
ズコート、含浸コート、リバースロールコート、トラン
スファロールコート、グラビアコート、キスコート、キ
ャストコート、スプレーコート、エクストルージョンコ
ート等が利用できるが、これらに限定されない。これら
のコート法によって非磁性支持体上に磁性層を構成させ
る場合、一層ずつ塗布乾燥工程を積み重ねる方式と乾燥
されていない湿潤状態にある層の上に次の層を逐次重ね
て塗布する方式とがあるが、本発明の磁気記録媒体の製
造に当たってはいずれの方式を採ることもできる。この
ような方式により、非磁性支持体上に塗布された磁性層
は必要により層中の強磁性金属微粒子を配向させる処理
を行った後、形成した磁性層を乾燥する。この場合配向
磁場は交流または直流で約５００〜５０００ガウス程度
であり、乾燥温度は約５０〜１２０℃程度、乾燥時間は
約０．１〜１０分程度である。また必要に応じて平面平
滑処理を施したり、所望の形状に裁断したりして、本発
明の磁気記録媒体を製造する。The thickness of these non-magnetic supports is as follows:
In the case of a sheet, the thickness is approximately 3 to 100 μm, preferably 5 μm.
~50μm, and 30μm for disks and cards
m to about 10 mm, and in the case of a drum shape, it is used in a cylindrical shape, and its shape is determined depending on the recorder used. An intermediate layer for improving adhesion may be provided between the nonmagnetic support and the magnetic layer. Coating methods for forming the magnetic layer on the non-magnetic support include air doctor coating, blade coating, air knife coating, squeeze coating, impregnation coating, reverse roll coating, transfer roll coating, gravure coating, kiss coating, and cast coating. , spray coating, extrusion coating, etc. can be used, but are not limited to these. When constructing a magnetic layer on a non-magnetic support using these coating methods, there are two methods: one is to apply and dry one layer at a time, and the other is to apply the next layer one after another on top of a wet layer that has not been dried. However, either method can be adopted in manufacturing the magnetic recording medium of the present invention. By such a method, the magnetic layer coated on the nonmagnetic support is optionally subjected to a treatment for orienting the ferromagnetic metal fine particles in the layer, and then the formed magnetic layer is dried. In this case, the orientation magnetic field is about 500 to 5000 Gauss in alternating current or direct current, the drying temperature is about 50 to 120°C, and the drying time is about 0.1 to 10 minutes. Further, the magnetic recording medium of the present invention is manufactured by subjecting it to a surface smoothing treatment or cutting it into a desired shape, if necessary.
【００２９】[0029]
【実施例】以下、本発明を具体的な実施例により説明す
るが、本発明はこの実施例に限定されるものではないこ
とは言うまでもない。
実施例１
以下実施例を示すが、ここで用いられる化合物は全て合
成したものであり、核磁気共鳴スペクトル及び赤外線吸
収スペクトルによりその構造を確認した。針状金属鉄磁
性微粒子（比表面積５３．９ｍ２ ／ｇ，保磁力Ｈｃ＝
１５９０Ｏｅ，飽和磁化σｓ＝１２０ｅｍｕ／ｇ，平均
長軸長０．３μｍ，針状比 ８〜１０）を用いて検討
を行った。４−ニトロカテコールの２．０×１０−３ｍ
ｏｌ／１のエタノール溶液１０重量部に、上記金属鉄磁
性微粒子５重量部を分散し、約３０分間超音波を照射し
た後、約２時間静置した。この金属鉄磁性微粒子をろ過
し、エタノールで繰り返し洗浄した後、真空乾燥を行っ
て処理磁性微粒子を得た。EXAMPLES The present invention will be explained below with reference to specific examples, but it goes without saying that the present invention is not limited to these examples. Example 1 An example will be shown below. All the compounds used here were synthesized, and their structures were confirmed by nuclear magnetic resonance spectra and infrared absorption spectra. Acicular metal iron magnetic fine particles (specific surface area 53.9 m2 /g, coercive force Hc=
The study was conducted using 1590 Oe, saturation magnetization σs = 120 emu/g, average major axis length 0.3 μm, and acicular ratio 8 to 10). 2.0 x 10-3 m of 4-nitrocatechol
5 parts by weight of the metal iron magnetic fine particles were dispersed in 10 parts by weight of an ol/1 ethanol solution, irradiated with ultrasonic waves for about 30 minutes, and then allowed to stand for about 2 hours. The metal iron magnetic fine particles were filtered, washed repeatedly with ethanol, and then vacuum dried to obtain treated magnetic fine particles.
【００３０】
処理磁性微粒子
１００重量部塩化ビニル酢酸ビニル共重合
体 １０重量部ポリウレタン樹
脂
１０重量部カーボン
３重量部酸化ア
ルミニウム
２重量部メチルエチルケトン
１００重量部トルエン
１００重量部シクロヘキサノン
５０重量部上記組
成の磁性塗料を調製し、これを９μｍポリエステルベー
スフィルム上に塗布して磁気テープを作成した。Treated magnetic fine particles
100 parts by weight Vinyl chloride vinyl acetate copolymer 10 parts by weight Polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight methyl ethyl ketone
100 parts by weight toluene
100 parts by weight cyclohexanone
A magnetic paint having the above composition was prepared in an amount of 50 parts by weight, and was coated on a 9 μm polyester base film to prepare a magnetic tape.
【００３１】このようにして得られた磁気テープを、湿
度９０％温度６０℃の条件下で１週間保持し、保存前の
初期値との比較から磁気特性の経時劣化について調べた
。この結果を表１に示す。なお比較として上記の磁性塗
料中の処理磁性微粒子を未処理の強磁性金属微粒子に代
えて磁気テープを作成し、その結果も併せて記した。The magnetic tape thus obtained was kept for one week under conditions of 90% humidity and 60° C., and the deterioration of the magnetic properties over time was investigated by comparing with the initial value before storage. The results are shown in Table 1. For comparison, a magnetic tape was prepared by replacing the treated magnetic fine particles in the magnetic paint with untreated ferromagnetic metal fine particles, and the results are also reported.
【表１】[Table 1]
【００３２】実施例２
実施例１での金属鉄磁性微粒子を用いて下記組成の磁性
塗料を作成し、実施例１と同様に磁気テープを作成した
。この場合には４−ニトロカテコールは組成の一部とし
て混練される。
金属鉄磁性微粒子
１００重量部４−ニトロカテコール
３重量部塩化ビ
ニル酢酸ビニル共重合体 １０
重量部ポリウレタン樹脂
１０重量部カーボン
３重量部酸化アルミニウム
２重量部メチルエチ
ルケトン １
００重量部トルエン
１００重量部シクロヘキ
サノン
５０重量部得られた磁気テープについて、実施例１
と同様にして経時劣化を検討した。この結果を表２に示
す。Example 2 A magnetic paint having the following composition was prepared using the metal iron magnetic fine particles prepared in Example 1, and a magnetic tape was prepared in the same manner as in Example 1. In this case, 4-nitrocatechol is kneaded as part of the composition. Metallic iron magnetic particles
100 parts by weight 4-nitrocatechol
3 parts by weight vinyl chloride vinyl acetate copolymer 10
Weight part polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight methyl ethyl ketone 1
00 parts by weight toluene
100 parts by weight cyclohexanone
Example 1 Regarding the magnetic tape obtained by 50 parts by weight
Deterioration over time was investigated in the same manner as above. The results are shown in Table 2.
【表２】[Table 2]
【００３３】実施例３
本実施例においては、磁性粉末として針状金属鉄磁性微
粒子（比表面積５３．９ｍ２ ／ｇ，保磁力Ｈｃ＝１５
９０ Ｏｅ、飽和磁化σｓ＝１２０ｅｍｕ／ｇ、平均
長軸長０．３μｍ、針状比８〜１０）を用いて検討を行
った。即ち、４，５−ジニトロカテコール２．０×１０
−３ｍｏｌ／ｌのエタノール溶液１００重量部に、上記
金属鉄磁性微粒子５重量部を分散し、約３０分間超音波
を照射した後、約２時間静置した。この金属鉄磁性微粒
子をろ過し、エタノールで繰り返し洗浄した後、真空乾
燥を行って処理磁性微粒子を得た。
処理磁性微粒子
１００重量部塩化ビニル酢酸ビニル共重合
体 １０重量部ポリウレタン樹
脂
１０重量部カーボン
３重量部酸化ア
ルミニウム
２重量部メチルエチルケトン
１００重量部トルエン
１００重量部シクロヘキサノン
５０重量部上記組
成の磁性塗料を調製し、これを９μｍポリエステルベー
スフィルム上に塗布して磁気テープを作成した。
得られた磁気テープについて、実施例１と同様にして経
時劣化を検討した。この結果を表３に示す。Example 3 In this example, acicular metal iron magnetic fine particles (specific surface area 53.9 m2 /g, coercive force Hc = 15
90 Oe, saturation magnetization σs=120 emu/g, average major axis length 0.3 μm, and acicular ratio 8 to 10). That is, 4,5-dinitrocatechol 2.0 x 10
5 parts by weight of the metal iron magnetic fine particles were dispersed in 100 parts by weight of -3 mol/l ethanol solution, irradiated with ultrasonic waves for about 30 minutes, and then allowed to stand for about 2 hours. The metal iron magnetic fine particles were filtered, washed repeatedly with ethanol, and then vacuum dried to obtain treated magnetic fine particles. treated magnetic particles
100 parts by weight Vinyl chloride vinyl acetate copolymer 10 parts by weight Polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight methyl ethyl ketone
100 parts by weight toluene
100 parts by weight cyclohexanone
A magnetic paint having the above composition was prepared in an amount of 50 parts by weight, and was coated on a 9 μm polyester base film to prepare a magnetic tape. Regarding the obtained magnetic tape, deterioration over time was examined in the same manner as in Example 1. The results are shown in Table 3.
【表３】[Table 3]
【００３４】実施例４
実施例３の金属鉄磁性微粒子を用いて下記組成の磁性塗
料を作成し、実施例１と同様に磁気テープを作成した。
金属鉄磁性微粒子
１００重量部４，５−ジニトロカテコール
３重量部塩化ビニル酢
酸ビニル共重合体 １０重量部
ポリウレタン樹脂
１０重量部カーボン
３重量部酸化アルミニウム
２重量部メチルエチルケト
ン １００重
量部トルエン
１００重量部シクロヘキサノン
５
０重量部得られた磁気テープについて、実施例１と同様
にして経時劣化を検討した。この結果を表４に示す。Example 4 A magnetic paint having the following composition was prepared using the metal iron magnetic fine particles of Example 3, and a magnetic tape was prepared in the same manner as in Example 1. Metallic iron magnetic particles
100 parts by weight 4,5-dinitrocatechol
3 parts by weight Vinyl chloride vinyl acetate copolymer 10 parts by weight Polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight Methyl ethyl ketone 100 parts by weight Toluene
100 parts by weight cyclohexanone 5
Regarding the obtained magnetic tape (0 parts by weight), deterioration over time was examined in the same manner as in Example 1. The results are shown in Table 4.
【表４】[Table 4]
【００３５】実施例５
本実施例においては、磁性粉末として針状金属鉄磁性微
粒子（比表面積５３．９ｍ２ ／ｇ、保磁力Ｈｃ＝１５
９０ Ｏｅ、飽和磁化σｓ＝１２０ｅｍｕ／ｇ、平均
長軸長０．３μｍ，針状比８〜１０）を用いて検討を行
った。即ち、３，４−ジニトロ安息酸２．０×１０−３
ｍｏｌ／ｌのエタノール溶液１００重量部に、上記金属
鉄磁性微粒子５重量部を分散し、約３０分間超音波を照
射した後、約２時間静置した。この金属鉄磁性微粒子を
ろ過し、エタノールで繰り返し洗浄した後、真空乾燥を
行って処理磁性微粒子を得た。
処理磁性微粒子
１００重量部塩化ビニル酢酸ビニル共重合
体 １０重量部ポリウレタン樹
脂
１０重量部カーボン
３重量部酸化ア
ルミニウム
２重量部メチルエチルケトン
１００重量部トルエン
１００重量部シクロヘキサノン
５０重量部上記組
成の磁性塗料を調製し、これを９μｍポリエステルベー
スフィルム上に塗布して磁気テープを作成した。
得られた磁気テープについて、実施例１と同様にして経
時劣化を検討した。この結果を表５に示す。Example 5 In this example, acicular metal iron magnetic fine particles (specific surface area 53.9 m2/g, coercive force Hc=15
90 Oe, saturation magnetization σs=120 emu/g, average major axis length 0.3 μm, and acicular ratio 8 to 10). That is, 3,4-dinitrobenzoic acid 2.0 x 10-3
5 parts by weight of the metal iron magnetic fine particles were dispersed in 100 parts by weight of a mol/l ethanol solution, irradiated with ultrasonic waves for about 30 minutes, and then allowed to stand for about 2 hours. The metal iron magnetic fine particles were filtered, washed repeatedly with ethanol, and then vacuum dried to obtain treated magnetic fine particles. treated magnetic particles
100 parts by weight Vinyl chloride vinyl acetate copolymer 10 parts by weight Polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight methyl ethyl ketone
100 parts by weight toluene
100 parts by weight cyclohexanone
A magnetic paint having the above composition was prepared in an amount of 50 parts by weight, and was coated on a 9 μm polyester base film to prepare a magnetic tape. Regarding the obtained magnetic tape, deterioration over time was examined in the same manner as in Example 1. The results are shown in Table 5.
【表５】[Table 5]
【００３６】実施例６
実施例５の金属鉄磁性微粒子を用いて下記組成の磁性塗
料を作成し、実施例１と同様に磁気テープを作成した。
金属鉄磁性微粒子
１００重量部３，４−ジニトロ安息香酸
３重量部塩化ビニル
酢酸ビニル共重合体 １０重量
部ポリウレタン樹脂
１０重量部カーボン
３重量部酸化アルミニウム
２重量部メチルエチルケ
トン １００
重量部トルエン
１００重量部シクロヘキサノ
ン
５０重量部得られた磁気テープについて、実施例１と同
様にして経時劣化を検討した。この結果を表６に示す。Example 6 A magnetic paint having the following composition was prepared using the metal iron magnetic fine particles of Example 5, and a magnetic tape was prepared in the same manner as in Example 1. Metallic iron magnetic particles
100 parts by weight 3,4-dinitrobenzoic acid
3 parts by weight Vinyl chloride vinyl acetate copolymer 10 parts by weight Polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight methyl ethyl ketone 100
Part by weight toluene
100 parts by weight cyclohexanone
Regarding the magnetic tape obtained in an amount of 50 parts by weight, deterioration over time was examined in the same manner as in Example 1. The results are shown in Table 6.
【表６】[Table 6]
【００３７】実施例７
本実施例においては、磁性粉末として針状金属鉄磁性微
粒子（比表面積５３．９ｍ２ ／ｇ，保磁力Ｈｃ＝１５
９０ Ｏｅ、飽和磁化σｓ＝１２０ｅｍｕ／ｇ、平均
長軸長０．３μｍ，針状比８〜１０）を用いて検討を行
った。即ち、４，５−ジニトロ安息香酸２．０×１０−
３ｍｏｌ／ｌのエタール溶液１００重量部に、上記金属
鉄磁性微粒子５重量部を分散し、約３０分間超音波を照
射した後、約２時間静置した。この金属鉄磁性微粒子を
ろ過し、エタノールで繰り返し洗浄した後、真空乾燥を
行って処理磁性微粒子を得た。
処理磁性粒子
１００重量部塩化ビニル酢酸ビニル共重
合体 １０重量部ポリウレタン
樹脂
１０重量部カーボン
３重量部酸化
アルミニウム
２重量部メチルエチルケトン
１００重量部トルエン
１００重量部シクロヘキサノン
５０重量部上記
組成の磁性塗料を調製し、これを９μｍポリエステルベ
ースフィルム上に塗布して磁気テープを作成した。
得られた磁気テープについて、実施例１と同様にして経
時劣化を検討した。この結果を表７に示す。Example 7 In this example, acicular metal iron magnetic fine particles (specific surface area 53.9 m2 /g, coercive force Hc = 15
90 Oe, saturation magnetization σs=120 emu/g, average major axis length 0.3 μm, and acicular ratio 8 to 10). That is, 4,5-dinitrobenzoic acid 2.0 x 10-
5 parts by weight of the metal iron magnetic fine particles were dispersed in 100 parts by weight of a 3 mol/l etal solution, irradiated with ultrasonic waves for about 30 minutes, and then allowed to stand for about 2 hours. The metal iron magnetic fine particles were filtered, washed repeatedly with ethanol, and then vacuum dried to obtain treated magnetic fine particles. treated magnetic particles
100 parts by weight Vinyl chloride vinyl acetate copolymer 10 parts by weight Polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight methyl ethyl ketone
100 parts by weight toluene
100 parts by weight cyclohexanone
A magnetic paint having the above composition was prepared in an amount of 50 parts by weight, and was coated on a 9 μm polyester base film to prepare a magnetic tape. Regarding the obtained magnetic tape, deterioration over time was examined in the same manner as in Example 1. The results are shown in Table 7.
【表７】[Table 7]
【００３８】実施例８
実施例７の金属鉄磁性微粒子を用いて下記組成の磁性塗
料を作成し、実施例１と同様に磁気テープを作成した。
金属鉄磁性微粒子
１００重量部４，５−ジニトロ安息香酸
３重量部塩化ビニル
酢酸ビニル共重合体 １０重量
部ポリウレタン樹脂
１０重量部カーボン
３重量部酸化アルミニウム
２重量部メチルエチルケ
トン １００
重量部トルエン
１００重量部シクロヘキサノ
ン
５０重量部得られた磁気テープについて、実施例１と同
様にして経時劣化を検討した。この結果を表８に示す。Example 8 A magnetic paint having the following composition was prepared using the metal iron magnetic fine particles of Example 7, and a magnetic tape was prepared in the same manner as in Example 1. Metallic iron magnetic particles
100 parts by weight 4,5-dinitrobenzoic acid
3 parts by weight Vinyl chloride vinyl acetate copolymer 10 parts by weight Polyurethane resin
10 parts by weight carbon
3 parts by weight aluminum oxide
2 parts by weight methyl ethyl ketone 100
Part by weight toluene
100 parts by weight cyclohexanone
Regarding the magnetic tape obtained in an amount of 50 parts by weight, deterioration over time was examined in the same manner as in Example 1. The results are shown in Table 8.
【表８】[Table 8]
【００３９】[0039]
【発明の効果】表１〜８で明らかなように、未処理の磁
性粉末を用いた場合に比べ、ベンゼン骨格を有する有機
酸のニトロ化合物で処理、或いは塗料化に際して混合し
た場合の磁気テープは、残留磁束密度や保磁力の低下は
極めて小さく、また角形比は初期値が維持される。従っ
て本発明における磁気記録媒体においては、磁気特性の
経時安定性や保存安定性が著しく向上される。[Effects of the Invention] As is clear from Tables 1 to 8, the magnetic tape treated with a nitro compound of an organic acid having a benzene skeleton or mixed when forming into a paint is more effective than when untreated magnetic powder is used. , the decrease in residual magnetic flux density and coercive force is extremely small, and the squareness ratio is maintained at its initial value. Therefore, in the magnetic recording medium of the present invention, the stability of magnetic properties over time and storage stability are significantly improved.
Claims (1)
を主体とする磁性層が形成されてなる磁気記録媒体にお
いて、上記磁性層にベンゼン骨格を有する有機酸のニト
ロ誘導体を含むことを特徴とする磁気記録媒体。1. A magnetic recording medium comprising a magnetic layer mainly composed of magnetic powder and a binder formed on a non-magnetic support, wherein the magnetic layer contains a nitro derivative of an organic acid having a benzene skeleton. Features of magnetic recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09154991A JP3154127B2 (en) | 1991-03-29 | 1991-03-29 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09154991A JP3154127B2 (en) | 1991-03-29 | 1991-03-29 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04302820A true JPH04302820A (en) | 1992-10-26 |
| JP3154127B2 JP3154127B2 (en) | 2001-04-09 |
Family
ID=14029576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09154991A Expired - Fee Related JP3154127B2 (en) | 1991-03-29 | 1991-03-29 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3154127B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007537353A (en) * | 2005-05-02 | 2007-12-20 | ピーピージー インダストリーズ オハイオ， インコーポレイテッド | Method for stabilizing metal pigments against gas evolution |
-
1991
- 1991-03-29 JP JP09154991A patent/JP3154127B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007537353A (en) * | 2005-05-02 | 2007-12-20 | ピーピージー インダストリーズ オハイオ， インコーポレイテッド | Method for stabilizing metal pigments against gas evolution |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3154127B2 (en) | 2001-04-09 |
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