JPH01196724A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH01196724A JPH01196724A JP2097988A JP2097988A JPH01196724A JP H01196724 A JPH01196724 A JP H01196724A JP 2097988 A JP2097988 A JP 2097988A JP 2097988 A JP2097988 A JP 2097988A JP H01196724 A JPH01196724 A JP H01196724A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic powder
- acid
- particle size
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 71
- 239000006247 magnetic powder Substances 0.000 claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 239000006229 carbon black Substances 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims abstract 9
- 239000002245 particle Substances 0.000 claims description 35
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- -1 polyethylene terephthalate Polymers 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000843 powder Substances 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 238000004140 cleaning Methods 0.000 abstract description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 abstract description 3
- 239000005020 polyethylene terephthalate Substances 0.000 abstract description 3
- 229910052594 sapphire Inorganic materials 0.000 abstract 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 21
- 239000000194 fatty acid Substances 0.000 description 21
- 229930195729 fatty acid Natural products 0.000 description 21
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 16
- 150000004665 fatty acids Chemical class 0.000 description 16
- 229920001577 copolymer Polymers 0.000 description 10
- 239000000178 monomer Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 6
- 239000006249 magnetic particle Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- GVNVAWHJIKLAGL-UHFFFAOYSA-N 2-(cyclohexen-1-yl)cyclohexan-1-one Chemical compound O=C1CCCCC1C1=CCCCC1 GVNVAWHJIKLAGL-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 101150065749 Churc1 gene Proteins 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 102100038239 Protein Churchill Human genes 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 229910052783 alkali metal Chemical group 0.000 description 4
- 150000001340 alkali metals Chemical group 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- GLYJVQDYLFAUFC-UHFFFAOYSA-N butyl hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)OCCCC GLYJVQDYLFAUFC-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- ZQPPMHVWECSIRJ-MDZDMXLPSA-N elaidic acid Chemical compound CCCCCCCC\C=C\CCCCCCCC(O)=O ZQPPMHVWECSIRJ-MDZDMXLPSA-N 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 4
- MVLVMROFTAUDAG-UHFFFAOYSA-N ethyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC MVLVMROFTAUDAG-UHFFFAOYSA-N 0.000 description 4
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 4
- 229920001228 polyisocyanate Polymers 0.000 description 4
- 239000005056 polyisocyanate Substances 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
- HQHCYKULIHKCEB-UHFFFAOYSA-N tetradecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCC(O)=O HQHCYKULIHKCEB-UHFFFAOYSA-N 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 3
- IZTHTNFCHNNDAQ-QXMHVHEDSA-N 11-methyldodecyl (Z)-octadec-9-enoate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCCCCCCCCCCC(C)C IZTHTNFCHNNDAQ-QXMHVHEDSA-N 0.000 description 3
- XDOFQFKRPWOURC-UHFFFAOYSA-N 16-methylheptadecanoic acid Chemical compound CC(C)CCCCCCCCCCCCCCC(O)=O XDOFQFKRPWOURC-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- SFAAOBGYWOUHLU-UHFFFAOYSA-N 2-ethylhexyl hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)OCC(CC)CCCC SFAAOBGYWOUHLU-UHFFFAOYSA-N 0.000 description 3
- OPJWPPVYCOPDCM-UHFFFAOYSA-N 2-ethylhexyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CC)CCCC OPJWPPVYCOPDCM-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 3
- OXPCWUWUWIWSGI-MSUUIHNZSA-N Lauryl oleate Chemical compound CCCCCCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC OXPCWUWUWIWSGI-MSUUIHNZSA-N 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000000020 Nitrocellulose Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- KRFDIKFDEHAOAL-GSYQBMALSA-N bis[(z)-octadec-9-enyl] (z)-but-2-enedioate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)\C=C/C(=O)OCCCCCCCC\C=C/CCCCCCCC KRFDIKFDEHAOAL-GSYQBMALSA-N 0.000 description 3
- DHAZIUXMHRHVMP-UHFFFAOYSA-N butyl tetradecanoate Chemical compound CCCCCCCCCCCCCC(=O)OCCCC DHAZIUXMHRHVMP-UHFFFAOYSA-N 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- LVGKNOAMLMIIKO-QXMHVHEDSA-N ethyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC LVGKNOAMLMIIKO-QXMHVHEDSA-N 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229920001220 nitrocellulos Polymers 0.000 description 3
- NKBWPOSQERPBFI-UHFFFAOYSA-N octadecyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCCCCCCCCCCCCCCCC NKBWPOSQERPBFI-UHFFFAOYSA-N 0.000 description 3
- QWPNJOHZHSJFIY-UHFFFAOYSA-N octyl tetradecanoate Chemical compound CCCCCCCCCCCCCC(=O)OCCCCCCCC QWPNJOHZHSJFIY-UHFFFAOYSA-N 0.000 description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 3
- YGDMPMKCHSXJJF-UHFFFAOYSA-N pentyl hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)OCCCCC YGDMPMKCHSXJJF-UHFFFAOYSA-N 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- ALKCLFLTXBBMMP-UHFFFAOYSA-N 3,7-dimethylocta-1,6-dien-3-yl hexanoate Chemical compound CCCCCC(=O)OC(C)(C=C)CCC=C(C)C ALKCLFLTXBBMMP-UHFFFAOYSA-N 0.000 description 2
- NZXZINXFUSKTPH-UHFFFAOYSA-N 4-[4-(4-butylcyclohexyl)cyclohexyl]-1,2-difluorobenzene Chemical compound C1CC(CCCC)CCC1C1CCC(C=2C=C(F)C(F)=CC=2)CC1 NZXZINXFUSKTPH-UHFFFAOYSA-N 0.000 description 2
- 229910018137 Al-Zn Inorganic materials 0.000 description 2
- 229910018185 Al—Co Inorganic materials 0.000 description 2
- 229910018507 Al—Ni Inorganic materials 0.000 description 2
- 229910018573 Al—Zn Inorganic materials 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- NDKYEUQMPZIGFN-UHFFFAOYSA-N Butyl dodecanoate Chemical compound CCCCCCCCCCCC(=O)OCCCC NDKYEUQMPZIGFN-UHFFFAOYSA-N 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 2
- VIZORQUEIQEFRT-UHFFFAOYSA-N Diethyl adipate Chemical compound CCOC(=O)CCCCC(=O)OCC VIZORQUEIQEFRT-UHFFFAOYSA-N 0.000 description 2
- RDOFJDLLWVCMRU-UHFFFAOYSA-N Diisobutyl adipate Chemical compound CC(C)COC(=O)CCCCC(=O)OCC(C)C RDOFJDLLWVCMRU-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910002065 alloy metal Inorganic materials 0.000 description 2
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- QZULIRBSQUIUTA-CLFAGFIQSA-N bis[(z)-octadec-9-enyl] hexanedioate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCC(=O)OCCCCCCCC\C=C/CCCCCCCC QZULIRBSQUIUTA-CLFAGFIQSA-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
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
- QXYJCZRRLLQGCR-UHFFFAOYSA-N dioxomolybdenum Chemical compound O=[Mo]=O QXYJCZRRLLQGCR-UHFFFAOYSA-N 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 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
- 229910052742 iron Inorganic materials 0.000 description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQILCOQZDHPEAZ-UHFFFAOYSA-N octyl palmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OCCCCCCCC OQILCOQZDHPEAZ-UHFFFAOYSA-N 0.000 description 2
- 229940049964 oleate Drugs 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- MOQRZWSWPNIGMP-UHFFFAOYSA-N pentyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCC MOQRZWSWPNIGMP-UHFFFAOYSA-N 0.000 description 2
- 229920006287 phenoxy resin Polymers 0.000 description 2
- 239000013034 phenoxy resin Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- BHHYHSUAOQUXJK-UHFFFAOYSA-L zinc fluoride Chemical compound F[Zn]F BHHYHSUAOQUXJK-UHFFFAOYSA-L 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-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
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- GRXOKLJPWSYWIA-UHFFFAOYSA-N 2-ethylhexyl tetradecanoate Chemical compound CCCCCCCCCCCCCC(=O)OCC(CC)CCCC GRXOKLJPWSYWIA-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- HIQIXEFWDLTDED-UHFFFAOYSA-N 4-hydroxy-1-piperidin-4-ylpyrrolidin-2-one Chemical compound O=C1CC(O)CN1C1CCNCC1 HIQIXEFWDLTDED-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
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 235000021357 Behenic acid Nutrition 0.000 description 1
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 1
- 239000005635 Caprylic acid (CAS 124-07-2) Substances 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 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
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- LVGKNOAMLMIIKO-UHFFFAOYSA-N Elaidinsaeure-aethylester Natural products CCCCCCCCC=CCCCCCCCC(=O)OCC LVGKNOAMLMIIKO-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 239000005639 Lauric acid Substances 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
イ、産業上の利用分野
本発明は磁気テープ、磁気シート、磁気ディスク等の磁
気記録媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to magnetic recording media such as magnetic tapes, magnetic sheets, and magnetic disks.
口、従来技術
最近、磁気テープ等の磁気記録媒体の高密度化、高S/
N化に伴ない、より粒子径の小さな磁性粉が用いられる
ようになりている。Prior Art Recently, magnetic recording media such as magnetic tapes have become denser and have higher S/S.
With the shift to nitrogen, magnetic powders with smaller particle diameters are being used.
一般に、磁気記録媒体のS/N比は、記録・再生に関係
する記録材料中の磁性粉の粒子数の平方根に比例すると
言われているため、同一重量の磁性粉を塗布した場合、
粒子径の小さい磁性粉を用いる程S/N向上に有利にな
る。また、磁性粉を微粒子化し、そのBET値を高める
と、磁性層の表面がそれだけ平滑となり、スペーシング
ロスが少なくなることから、高い電磁変換特性を得る上
で有利である。金属磁性粉を用いると、更に高密度記録
が可能であり、性能が一層向上する。Generally, it is said that the S/N ratio of a magnetic recording medium is proportional to the square root of the number of particles of magnetic powder in the recording material involved in recording and reproduction. Therefore, when applying the same weight of magnetic powder,
The use of magnetic powder with a smaller particle size is more advantageous in improving the S/N. Further, by making the magnetic powder into fine particles and increasing its BET value, the surface of the magnetic layer becomes smoother and spacing loss is reduced, which is advantageous in obtaining high electromagnetic conversion characteristics. If metal magnetic powder is used, even higher density recording is possible and performance is further improved.
しかしながら、磁性粉を微粒子化し、そのBET値を高
めると、磁性層の表面がそれだけ平滑となり、却ってテ
ープの走行耐久性の悪化を招く。即ち、上記のような記
録媒体は記録再生時に激しく磁気ヘッドに摺接するため
、表面の平滑化に伴う摺接面積の増大、摩擦係数の増大
により、却って走行性が劣化するのである。これにより
、繰り返し使用時の磁性塗膜の摩耗や、塗膜中に含有さ
れる磁性粉の脱落、脱落した磁性粉による磁気ヘッドの
目詰りといった好ましくない結果を生ずる。However, when the magnetic powder is made into fine particles and its BET value is increased, the surface of the magnetic layer becomes smoother, which actually deteriorates the running durability of the tape. That is, since the recording medium as described above comes into violent sliding contact with the magnetic head during recording and reproduction, the smoothing of the surface increases the sliding contact area and increases the coefficient of friction, which actually deteriorates the running performance. This causes undesirable results such as wear of the magnetic coating film during repeated use, shedding of magnetic powder contained in the coating, and clogging of the magnetic head due to the fallen magnetic powder.
こうした磁気記録媒体の耐久性を向上させるためには、
磁性層中に非磁性研摩剤粒子を含有させることが考えら
れるが1粒子の種類・粒径によっては却って特性の劣化
を生ずるため、その選択が問題である。また、特に磁気
ヘッドの目詰りは、記録再生に悪影響を与えるため、磁
性層のクリーニング効果を高める必要がある。In order to improve the durability of these magnetic recording media,
It is conceivable to include non-magnetic abrasive particles in the magnetic layer, but the selection is a problem because the properties may deteriorate depending on the type and size of the particles. Furthermore, since clogging of the magnetic head in particular has an adverse effect on recording and reproduction, it is necessary to improve the effectiveness of cleaning the magnetic layer.
ハ0発明の目的
本発明の目的は、高密度記録が可能で、S/N比等の電
磁変換特性に優れ、クリーニング効果に優れていて磁気
ヘッドの目詰りを効果的に防止でき、走行性が良好で走
行耐久性に優れている磁気記録媒体を提供することであ
る。The purpose of the present invention is to enable high-density recording, have excellent electromagnetic conversion characteristics such as S/N ratio, have an excellent cleaning effect, effectively prevent clogging of the magnetic head, and provide running performance. An object of the present invention is to provide a magnetic recording medium which has good performance and excellent running durability.
二0発明の構成
本発明は、結合剤とこの結合剤中に分散された金属磁性
粉とが磁性層に含有されている磁気記録媒体において、
前記金属磁性粉の比表面積が45rrl’/g以上であ
り、平均粒径が40mμ以上、400mμ以下であるカ
ーボンブラックと、平均粒径が0.4μm以下であるα
−三酸化二アルミニウムと、平均粒径が0.5μm以下
である三酸化二クロムとが前記磁性層に含有され、かつ
前記α−三酸化二アルミニウムと前記三酸化二クロムと
の含有量比(α−三酸化二アルミニウム:三酸化二クロ
ム)が重量比で(15: 85 )〜(85: 15
)であることを特徴とする磁気記録媒体に係るものであ
る。20 Structure of the Invention The present invention provides a magnetic recording medium in which a magnetic layer contains a binder and metal magnetic powder dispersed in the binder.
The metal magnetic powder has a specific surface area of 45 rrl'/g or more, carbon black whose average particle size is 40 mμ or more and 400 mμ or less, and α whose average particle size is 0.4 μm or less.
- Dialuminum trioxide and dichromium trioxide having an average particle size of 0.5 μm or less are contained in the magnetic layer, and the content ratio of the α-dialium trioxide and the dichromium trioxide ( α-dialium trioxide: dichromium trioxide) in a weight ratio of (15:85) to (85:15)
) The present invention relates to a magnetic recording medium characterized by:
本発明によれば、磁性粉として比表面積が45rll’
/g以上の金属磁性粉を用いているので、高密度記録が
可能であって、S/N比等に優れた媒体を提供できる。According to the present invention, the magnetic powder has a specific surface area of 45rll'.
Since metal magnetic powder with a particle size of /g or more is used, high-density recording is possible and a medium with excellent S/N ratio etc. can be provided.
また、本発明においては、非磁性研摩剤粒子としてα−
三酸化二アルミニウム(α−アルミナ)と三酸化二クロ
ム(Cr−0= )との組合せを選択したこと、α−ア
ルミナの平均粒径な0.4μm以下としかつ三酸化二ク
ロムの平均粒径を、0.5μm以下としたこと、これら
の配合比を限定したことに顕著な特徴を有する。In addition, in the present invention, α-
The combination of dialuminum trioxide (α-alumina) and dichromium trioxide (Cr-0= ) was selected, and the average particle size of α-alumina was 0.4 μm or less, and the average particle size of dichromium trioxide was selected. It has remarkable characteristics in that it is set to 0.5 μm or less and that the blending ratio of these is limited.
即ち、比表面積を45rT?79以上に高微粒子化した
金属磁性粉の採用に伴い、これに適合するように非磁性
研摩剤粒子の選択を行わねばならず、こうした選択は実
験の積み重ねによるのが現状である。That is, the specific surface area is 45rT? With the adoption of metal magnetic powder with finer particles of 79 or higher, it is necessary to select non-magnetic abrasive particles that are compatible with this, and currently such selection is based on repeated experiments.
ここにおいて、本発明者は、上記構成の採用により、良
好な結果が得られることを見出した。Here, the inventors have found that good results can be obtained by employing the above configuration.
即ち、α−アルミナと三酸化二クロムとの併用により、
それぞれが有する特有のクリーニング作用を活用しつつ
、全体として効果的に磁気ヘッドに詰った異物を除去で
きる。That is, by using α-alumina and dichromium trioxide in combination,
While utilizing the unique cleaning action of each, it is possible to effectively remove foreign matter clogging the magnetic head as a whole.
この際、両者の含有量比を限定していることも重要であ
って、これによりそれぞれの特有のクリーニング作用の
活用が可能となるのであって、この範囲を外れると磁気
ヘッドにダメージを生じ易(なったり、あるいは磁気ヘ
ッドのクリーニング効果が不充分となる傾向がある。At this time, it is also important to limit the content ratio of the two, as this makes it possible to take advantage of the unique cleaning action of each, and if it deviates from this range, it is likely to cause damage to the magnetic head. (or the cleaning effect of the magnetic head tends to be insufficient).
また、α−アルミナの平均粒径を0.4μm以下とし、
かつ三酸化二クロムの平均粒径な0.5μm以下として
いるので、磁性層表面を適度に粗らすことができ、高微
粒子化された金属磁性粉本来の高密度記録、高い電磁変
換特性を充分に発揮させつつ、磁気ヘッドの目詰りを防
止すると共に走行性、走行耐久性を向上させることが可
能となる。In addition, the average particle size of α-alumina is 0.4 μm or less,
In addition, since the average particle size of dichromium trioxide is 0.5 μm or less, the surface of the magnetic layer can be appropriately roughened, and the high-density recording and high electromagnetic conversion characteristics inherent to highly fine-grained metal magnetic powder can be achieved. It is possible to prevent clogging of the magnetic head and improve running performance and running durability while making full use of the magnetic head.
仮に、平均粒径がこの範囲を外れると、非磁性粒子の分
散によって磁性層表面が粗(なり、ヘッドと磁性層との
間に空間が生じ易いことにより、高微粒子化された金属
磁性粉により得られるはずの電磁変換特性に悪影響を与
えることとなる。If the average particle size falls outside this range, the surface of the magnetic layer becomes rough due to the dispersion of non-magnetic particles, and a space is likely to be created between the head and the magnetic layer, resulting in the formation of fine particles of metal magnetic powder. This will adversely affect the electromagnetic conversion characteristics that should be obtained.
また、α−アルミナと三酸化二クロムとの含有量比が前
記した重量比の範囲に保たれていることによっても、磁
性層表面を適度に粗すことかできるのであり、例えば三
酸化二クロムの含有量比がこれより大きくなると、磁性
層表面が更に粗れる傾向がある。Furthermore, by keeping the content ratio of α-alumina and dichromium trioxide within the above-mentioned weight ratio range, the surface of the magnetic layer can be appropriately roughened, for example, dichromium trioxide. If the content ratio is larger than this, the surface of the magnetic layer tends to become even rougher.
更に、磁性層中に平均粒径が40mμ以上、400mμ
以下であるカーボンブラックを含有せしめている点も重
要であり、平均粒径をこの範囲内に限定することにより
、高微粒子化された金属磁性粉との関係で磁気記録媒体
の走行性向上、!磁変換特性向上に効果的に寄与するこ
とができ、α−アルミナ、三酸化二クロムの平均粒径を
限定したことと相まって、高微粒子化された金属磁性粉
に特に適合した媒体を提供できる。Furthermore, the average grain size is 40 mμ or more, 400 mμ in the magnetic layer.
It is also important that the following carbon black is contained, and by limiting the average particle size to within this range, the runnability of the magnetic recording medium can be improved in relation to the highly fine-grained metal magnetic powder. This can effectively contribute to improving magnetic conversion characteristics, and in combination with limiting the average particle size of α-alumina and dichromium trioxide, it is possible to provide a medium that is particularly suitable for highly fine-grained metal magnetic powder.
上記した本発明の効果をより一層良好に奏する上で、金
属磁性粉の比表面積は50rn”/、9以上、70m″
/g以下とするのが好ましい。また、カーボンブランク
の平均粒径は更に、40〜350mμの範囲内とするの
が好ましく、その含有量は磁性粉100重量部に対し0
.01〜5重量部(更には0.1〜3重量部)の範囲内
とするのが好ましい。In order to achieve the above-mentioned effects of the present invention even better, the specific surface area of the metal magnetic powder is 50 rn"/, 9 or more, and 70 m"
/g or less is preferable. Further, the average particle diameter of the carbon blank is preferably within the range of 40 to 350 mμ, and the content thereof is 0 to 100 parts by weight of magnetic powder.
.. It is preferably within the range of 0.01 to 5 parts by weight (more preferably 0.1 to 3 parts by weight).
α−アルミナの平均粒径は0.1〜3μmの範囲内とす
ると更に好ましく、三酸化二クロムの平均粒径は0.1
〜0.4μmの範囲内とすると更に好ましい。α−アル
ミナと三酸化二クロムの含有量比(α−アルミナ:三酸
化二クロム)は重量比で(20: 80 )〜(80:
20 )の範囲内とすると更に好ましい。α−アルミ
ナと三酸化二クロムとの含有量の総和は、磁性粉100
重量部に対して20重量部以下が好ましく、5〜15重
量部の範囲内とすると更に好ましい。The average particle size of α-alumina is more preferably within the range of 0.1 to 3 μm, and the average particle size of dichromium trioxide is 0.1 μm.
It is more preferable to set it within the range of ~0.4 μm. The content ratio of α-alumina and dichromium trioxide (α-alumina: dichromium trioxide) is (20:80) to (80:
It is more preferable to fall within the range of 20). The total content of α-alumina and dichromium trioxide is 100% of the magnetic powder.
It is preferably 20 parts by weight or less, more preferably 5 to 15 parts by weight.
また、磁性層の平均表面粗さRa (表面凹凸のX旦
中心線の平均芦さ又は高さ二以下同じ)は、0.005
〜0.011μmの範囲内とするのが好ましい。In addition, the average surface roughness Ra of the magnetic layer (the average height or height of the center line of the surface unevenness, which is equal to or less than 2) is 0.005
It is preferably within the range of ~0.011 μm.
即ち、磁性層のRaをこの範囲とすることにより、走行
性を良好にしつつ、磁気ヘッドと磁性層表面との間のス
ペーシングロスを小さ(でキ、高出力、高S/Nが得ら
れる。かかるRaの範囲は、本発明の構成により達成し
うるものである。In other words, by setting the Ra of the magnetic layer within this range, it is possible to improve the running performance while reducing the spacing loss between the magnetic head and the surface of the magnetic layer (which results in high output and high S/N). This range of Ra can be achieved by the configuration of the present invention.
なお、上記の比表面積はBET値で表わされ、単位重量
あたりの表面積をいい、平均粒子径とは全く異なった物
理量であり、例えば平均粒子径は同一であっても、比表
面積が大きなものと、比表面積が小さいものが存在する
。比表面積の測定は、例えばまず、粉末を250℃前後
で30〜60分加熱処理しながら脱気して、該粉末に吸
着されているものを除去し、その後、測定装置に導入し
て、窒素の初期圧力を0.5kg/m″に設定し、窒素
により液体窒素温度(−195℃)で吸着測定を行つ(
−般にB、 E、 T法と称されている比表面積の測定
方法。詳しくはJ、 Ame、 Chem、 Sac、
60309(1938)を参照)。この比表面積(B
ET値)の測定装置には、漏洩電池(株)ならびに漏洩
アイオニクス(株)の共同製造による「粉粒体測定装置
(カンタ−ソーブ)」を使用することができる。The above specific surface area is expressed as a BET value, which refers to the surface area per unit weight, and is a physical quantity that is completely different from the average particle size. For example, even if the average particle size is the same, the specific surface area is large. There are some with small specific surface area. To measure the specific surface area, for example, first, the powder is heated at around 250°C for 30 to 60 minutes while being degassed to remove what is adsorbed to the powder, and then introduced into a measuring device and filled with nitrogen. Set the initial pressure of
- A specific surface area measurement method generally referred to as the B, E, T method. For details, please refer to J, Ame, Chem, Sac,
60309 (1938)). This specific surface area (B
As a measuring device for the ET value, it is possible to use a "powder measuring device (Cantersorb)" jointly manufactured by Leakage Battery Co., Ltd. and Leakage Ionics Co., Ltd.
比表面積ならびにその測定方法についての一般的な説明
は[粒体の測定j (J、 M、 DALLAVALL
E。A general explanation of the specific surface area and its measurement method can be found in [Measurement of Granules (J, M, DALLAVALL
E.
CLYDEORRJr共著、弁圧その他訳;産業図書社
刊)に詳しく述べられており、また「化学便覧」(応用
編、1170〜1171頁、日本化学会編、丸善(株)
昭和41年4月30日発行)にも記載されている(なお
前記「化学便覧」では、比表面積を単に表面積(rn’
/gr)と記載しているが1本発明書における比表面積
と同一のものである。、)。It is described in detail in "Chemistry Handbook" (Application Edition, pp. 1170-1171, edited by the Chemical Society of Japan, published by Maruzen Co., Ltd.)
(Published on April 30, 1966)
/gr), which is the same as the specific surface area in the present invention. ,).
ここで、上記の「平均粒径」は、電子顕微鏡で直接選別
的にカウントして測定してもよいし、レーザー光線等を
用いて粒径分布から測定してもよい。また比表面積から
球形として算出することもできる。また他の公知の方法
を用いることもできる。詳しくはrcARBONBLA
CK年鑑1984 J(カーボンブラック協会刊)や「
カーボンブラック便覧」(カーボンブラック協会編)、
及び「新実験化学講座第18巻」(日本化学会編、昭和
52年、丸善株式会社刊)等を参照できる。Here, the above-mentioned "average particle size" may be measured by directly selectively counting with an electron microscope, or may be measured from particle size distribution using a laser beam or the like. It can also be calculated as a sphere from the specific surface area. Other known methods can also be used. For details, see rcARBONBLA
CK Yearbook 1984 J (published by Carbon Black Association) and “
Carbon Black Handbook” (edited by Carbon Black Association),
and "New Experimental Chemistry Course Volume 18" (edited by the Chemical Society of Japan, published by Maruzen Co., Ltd. in 1977).
本発明で使用可能な金属磁性粉としては、Fe、Ni、
Coをはじめ、Fe−Al系、Fe−Al−Ni系、F
e−Al−Co系、Fe−Ni−8i系、Fe−AA!
−Zn系、Fe−Ni−Co系、Fe −Mn −Zn
系、Fe−Ni系、Fe−N1−kl系、Fe −Ni
−Zn系、Fe−Co−Ni−Cr系、Fe −C。Examples of metal magnetic powders that can be used in the present invention include Fe, Ni,
Including Co, Fe-Al system, Fe-Al-Ni system, F
e-Al-Co system, Fe-Ni-8i system, Fe-AA!
-Zn series, Fe-Ni-Co series, Fe-Mn-Zn
system, Fe-Ni system, Fe-N1-kl system, Fe-Ni
-Zn series, Fe-Co-Ni-Cr series, Fe-C.
−Ni−P系、Co−Ni系、Fe、Ni、Co等を主
成分とするメタル磁性粉等の強磁性粉が挙げられる。な
かでも、Feが80 atm%以上c更には90 at
m 4以上)のFe系金属磁性粉が電気特性的に優れ、
耐食性及び分散性の点で特にFe −Al。-Ni-P type, Co--Ni type, ferromagnetic powder such as metal magnetic powder containing Fe, Ni, Co, etc. as main components. Among them, Fe is 80 atm% or morec and even 90 atm%
Fe-based metal magnetic powder with a diameter of 4 m or more has excellent electrical properties,
Especially Fe-Al in terms of corrosion resistance and dispersibility.
Fe−Al Ni、Fe−Al−Zn、Fe−Al−C
o%Fe−Ni、 Fe −Ni −A1. Fe −
Ni −Al−3i −Zn、 Fe −Ni −AA
!−3i−Mnの系の金属磁性粉が好ましい。Fe-Al-Ni, Fe-Al-Zn, Fe-Al-C
o%Fe-Ni, Fe-Ni-A1. Fe −
Ni-Al-3i-Zn, Fe-Ni-AA
! -3i-Mn type metal magnetic powder is preferred.
更には、鉄−アルミニウム系(Fe−Al系、Fe−A
l−Ni系、Fe−Al−Zn系、Fe−Al−Co系
等)金属磁性粉が特に好ましい。以下、鉄−アルミニウ
ム系を単にFe−Al系と称す。Furthermore, iron-aluminum system (Fe-Al system, Fe-A
1-Ni type, Fe-Al-Zn type, Fe-Al-Co type, etc.) metal magnetic powders are particularly preferred. Hereinafter, the iron-aluminum system will be simply referred to as the Fe-Al system.
即ち、近年のビデオテープの用途は、ボータプル化に伴
い多岐にわたり、その使用条件はさまざまである。従っ
て、ビデオテープには高い耐蝕性が要求されることにな
る。この点、Fe−AA系磁性粉は高耐蝕性を示し、か
つ分散性も良好である。このことは、磁性粉の比表面積
を大きくしても、その分散性を十分とすることができる
ために、高密度記録の実現にとって非常に重要である。That is, the uses of videotapes in recent years have become diverse as they have become more portable, and the conditions for their use have varied. Therefore, video tapes are required to have high corrosion resistance. In this respect, Fe-AA magnetic powder exhibits high corrosion resistance and good dispersibility. This is very important for realizing high-density recording, since even if the specific surface area of the magnetic powder is increased, its dispersibility can be sufficient.
また、上記のFe−Al系金属磁性粉において。Moreover, in the above-mentioned Fe-Al based metal magnetic powder.
磁性粉のAl含有量を0.1〜20原子チの範囲内とす
るのが好ましい。It is preferable that the Al content of the magnetic powder is within the range of 0.1 to 20 atoms.
磁性層に含有されるカーボンブラックとしては、次のも
のが例示される。Examples of carbon black contained in the magnetic layer include the following.
キャポット社製として、スターリング−8O、スターリ
ング−NS、スターリング−R,スターリング−■、リ
ーガルー5RF−3、三菱化成(株)製として、CF−
9、#20B、#10B、#5B、コロンビアンカーボ
ン社製として、ラーベン−500゜ラーペン−450%
ラーベン−430、ラーベンー420、ラーベン−4
10、MT−CI、ラーペン−22、ラーベン−16、
ラーペン−14、電気化学社製のM S−100、旭カ
ーボン社製の#60H,#60U、#60.#55、$
50U、It−50、#35%アサヒサーマル、M S
−500などがあげられる。Sterling-8O, Sterling-NS, Sterling-R, Sterling-■, Regaloo 5RF-3 as manufactured by Capot, CF- as manufactured by Mitsubishi Kasei Corporation.
9, #20B, #10B, #5B, manufactured by Columbia Carbon Co., Ltd., Raven-500°Rapen-450%
Raven-430, Raven-420, Raven-4
10, MT-CI, Rapen-22, Raben-16,
La Pen-14, MS-100 manufactured by Denki Kagaku Co., Ltd., #60H, #60U, #60. manufactured by Asahi Carbon Co., Ltd. #55, $
50U, It-50, #35% Asahi Thermal, MS
Examples include -500.
本発明で使用可能な結合剤としては、平均分子量が約1
0000〜200000のもので、例えばウレタン樹脂
、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−アクリロニトリル共
重合体、ブタジェン−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
ェン共重合体、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、アクリル系反応樹
脂、高分子量ポリエステル樹脂とインシアネートプレポ
リマーの混合物、ポリエステルポリオールとポリイソシ
アネートの混合物、尿素ホルムアルデヒド樹脂、低分子
量グリコール/高分子量ジオール/インシアネートの混
合物、及びこれらの混合物等が例示される。The binder that can be used in the present invention has an average molecular weight of about 1
0000 to 200,000, such as urethane resin, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, butadiene-acrylonitrile copolymer, polyamide resin, polyvinyl butyral, Cellulose derivatives (cellulose acetate butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, nitrocellulose, etc.), styrene-butadiene copolymers, polyester resins, various synthetic rubbers,
Phenolic resins, epoxy resins, urea resins, melamine resins, phenoxy resins, silicone resins, acrylic reactive resins, mixtures of high molecular weight polyester resins and incyanate prepolymers, mixtures of polyester polyols and polyisocyanates, urea formaldehyde resins, low molecular weight glycols / high molecular weight diol / incyanate mixture, and mixtures thereof are exemplified.
前記した樹脂は、−8O,M、−COOM、−PO(O
M’)、(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1M°は水素、リチウム、カリ
ウム、ナトリウム等のアルカリ金属又は炭化水素残基)
等の親水性極性基を含有した樹脂であるのがよい。即ち
こうした樹脂は分子内の極性基によって、金属磁性粉と
のなじみが向上し、これによって磁性粉の分散性を更に
良くし、かつ金属磁性粉の凝集も防止して塗液安定性を
一層向上させることができる。The above resins include -8O,M, -COOM, -PO(O
M'), (where M is hydrogen or an alkali metal such as lithium, potassium, or sodium; 1M° is an alkali metal such as hydrogen, lithium, potassium, or sodium, or a hydrocarbon residue)
It is preferable to use a resin containing a hydrophilic polar group such as. In other words, the polar groups in the molecules of these resins improve the compatibility with the metal magnetic powder, which further improves the dispersibility of the magnetic powder and prevents agglomeration of the metal magnetic powder, further improving the stability of the coating liquid. can be done.
使用する結合剤、特に塩化ビニル系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のアルカリ塩を
含有した共重合性モノマー及び必要に応じ他の共重合性
モノマーを共重合することによって得ることができる。The binder used, especially the vinyl chloride copolymer, can be obtained by copolymerizing a vinyl chloride monomer, a copolymerizable monomer containing an alkali salt of sulfonic acid or phosphoric acid, and other copolymerizable monomers as necessary. Can be done.
この共重合体はビニル合成によるものであるので合成が
容易であり、且つ共重合成分を種々選ぶことができ、共
重合体の特性を最適に調整することができる。Since this copolymer is based on vinyl synthesis, it is easy to synthesize, and various copolymer components can be selected, so that the properties of the copolymer can be optimally adjusted.
上記したスルホン酸もしくはリン酸の塩の金属はアルカ
リ金属(特にナトリウム、カリウム、リチウム)であり
、特にカリウムが溶解性、反応性、収率等の点で好まし
い。The metal of the above-mentioned sulfonic acid or phosphoric acid salt is an alkali metal (especially sodium, potassium, lithium), and potassium is particularly preferred in terms of solubility, reactivity, yield, etc.
スルホン酸塩を含有する上記の共重合性モノマーとして
は、
CH,=CH3O,M。The above-mentioned copolymerizable monomer containing a sulfonate salt is CH,=CH3O,M.
CH,=CHCH,SO,M、 CH,=C(CH,) CH,SO,M。CH,=CHCH,SO,M, CH,=C(CH,) CH,SO,M.
CH,=CFICFI、0COCH(CH,C00R)
SO,M、CH,=CHCH,OCH,CM(OH)C
H,SO,M。CH,=CFICFI,0COCH(CH,C00R)
SO,M,CH,=CHCH,OCH,CM(OH)C
H, SO, M.
CH,=C(CE(、)COOC,H,SO,M=CH
,=CHC00C,H,SO,M、CH,=CHC0N
HC(CL’l、CH,SO,M、が挙げられる。CH,=C(CE(,)COOC,H,SO,M=CH
,=CHC00C,H,SO,M,CH,=CHC0N
Examples include HC(CL'l, CH, SO, M).
またリン酸塩としては、
CH,=CHCH,OCH,CH(OH)CH,−0−
PO,MY’、CH,= CHCONHC(CH,)、
CH,−0−PO,MY″、CH,= CHCH−0
(CH−CH−0)m PO−MX”、上記に於いてM
はアルカリ金属、Rは炭素原子数1〜20個のアルキル
基、Y“はH,M又はCH,=CHCH,OCH,CH
(OH)CH,−5Y′はH,M又は
CH,=CHC0NHC(CH,)tCH,−1X1は
。In addition, as phosphates, CH, =CHCH, OCH, CH(OH)CH, -0-
PO, MY', CH, = CHCONHC(CH,),
CH,-0-PO,MY'', CH,=CHCH-0
(CH-CH-0)m PO-MX”, M in the above
is an alkali metal, R is an alkyl group having 1 to 20 carbon atoms, Y" is H, M or CH, =CHCH, OCH, CH
(OH)CH, -5Y' is H, M or CH, =CHCONHC (CH,)tCH, -1X1.
CH,= CHC計○−0(CH,CH,O)ド。CH, = CHC meter ○-0 (CH, CH, O).
OHまたはOM、X”は
CH−= CHCH−0(CH−CH−0) m −1
OH又はOMである。またnは1〜100.mは1〜1
00の正数である。OH or OM, X” is CH-= CHCH-0(CH-CH-0) m −1
OH or OM. Also, n is 1 to 100. m is 1~1
It is a positive number of 00.
また必要に応じ共重合させる共重合性モノマーとしては
、公知の重合性モノマーがあり、例えば種々のビニルエ
ステル、塩化ビニリデン、アクリロニトリル、メタクリ
ロニトリル、スチレン、アクリル酸、メタクリル酸、種
々のアクリル酸エステル、メタクリ酸エステル、エチレ
ン、プロピレン、イソブチン、ブタジェン、イソプレン
、ビニルエーテル、アリールエーテル、アリールエステ
ル、アクリルアミド、メタクリルアミド、マレイン酸、
マレイン酸エステル等が例示される。Copolymerizable monomers to be copolymerized as necessary include known polymerizable monomers, such as various vinyl esters, vinylidene chloride, acrylonitrile, methacrylonitrile, styrene, acrylic acid, methacrylic acid, and various acrylic esters. , methacrylic acid ester, ethylene, propylene, isobutyne, butadiene, isoprene, vinyl ether, aryl ether, aryl ester, acrylamide, methacrylamide, maleic acid,
Examples include maleic acid esters.
本発明に使用する上記結合剤は乳化重合、溶液重合、懸
濁重合、塊状重合等の重合法により重合される。いずれ
の方法に於いても必要に応じて分子量調節剤、重合開始
剤、モノマーの分割添加あるいは連続添加などの公知の
技術が応用できる。The binder used in the present invention is polymerized by a polymerization method such as emulsion polymerization, solution polymerization, suspension polymerization, or bulk polymerization. In either method, known techniques such as divisional addition or continuous addition of molecular weight regulators, polymerization initiators, and monomers can be applied as necessary.
本発明において用いられる上記結合剤中の前記酸性基の
塩含有モノマー量は0.01〜30モルチであるのが好
ましい。該塩含有モノマー量が多すぎると、溶剤への溶
解性が悪くまたゲル化が起こりやすい。また塩含有モノ
マー量が少なすぎると所望の特性が得られなくなる。The amount of the acidic group salt-containing monomer in the binder used in the present invention is preferably 0.01 to 30 mol. If the amount of the salt-containing monomer is too large, the solubility in solvents will be poor and gelation will likely occur. Furthermore, if the amount of salt-containing monomer is too small, desired characteristics cannot be obtained.
上記の塩化ビニル系共重合体は更に、エポキシ基又は水
酸基を含有しているのが好ましい。ところで、従来の塩
ビ系共重合体(例えばU、 C,C。Preferably, the vinyl chloride copolymer further contains an epoxy group or a hydroxyl group. By the way, conventional vinyl chloride copolymers (for example, U, C, C.
社製のVAGH)は以下の共重合成分からなっていた。VAGH) manufactured by Co., Ltd. consisted of the following copolymerized components.
:共重合ユニットを示す。: Indicates a copolymerization unit.
しかし、ここでCH,Co−0−の基は、硬化剤等との
架橋反応には寄与しにくいものと考えられる。そこで、
CH,COに代えて、
等のエポキシ基を含有させるのが好ましい。例えば次の
ユニットをもつ共重合体が挙げられる。However, it is thought that the CH and Co-0- groups here do not easily contribute to the crosslinking reaction with the curing agent and the like. Therefore,
It is preferable to contain an epoxy group such as the following instead of CH or CO. For example, a copolymer having the following units may be mentioned.
んだモノマーユニット部分)
特に、少なくともウレタン樹脂を使用するのがよ(、爽
に塩化ビニル系共重合体、エボキク樹脂(特にフェノキ
シ樹脂)、ポリエステル系樹脂又はニトロセルロース樹
脂(以下、他の樹脂と称する。)を併用するのがよい。In particular, it is recommended to use at least urethane resin (vinyl chloride copolymer, evoki resin (especially phenoxy resin), polyester resin, or nitrocellulose resin (hereinafter, other resins). It is recommended to use them together.
この場合、ウレタン樹脂と他の樹脂との配合比としては
、他の樹脂が90〜10重量部、より好ましくは80〜
20重量部であるのが望ましい。上記配合比が90重量
部を越えると塗膜かもろ(なりすぎ塗膜の耐久性が著し
く劣化し、また支持体との接着性も悪くなる。In this case, the blending ratio of the urethane resin and the other resin is 90 to 10 parts by weight, more preferably 80 to 10 parts by weight.
Preferably, the amount is 20 parts by weight. If the above-mentioned blending ratio exceeds 90 parts by weight, the coating film becomes brittle (the durability of the coating film is significantly deteriorated and the adhesion to the support is also deteriorated).
また上記配合比が10重量部未満であると、磁性粉の粉
落ちがおこり易くなる。Further, if the above-mentioned blending ratio is less than 10 parts by weight, the magnetic powder tends to fall off.
更に、本発明において、結合剤を含有する磁性塗料には
更にポリイソシアネート系硬化剤を添加することにより
、耐久性を向上することができる。Furthermore, in the present invention, durability can be improved by further adding a polyisocyanate curing agent to the magnetic paint containing a binder.
このようなポリイソシアネート系硬化剤としては、例え
ば、トリレンジイソシアネート、ジフェニルメタンジイ
ソシアネート、ヘキサンジイソシアネート等の2官能イ
ンシアネート、コロネートしく日本ポリウレタン工業(
株)製)、デスモジュールL(バイエル社製)等の3官
能イソシアネート、または両末端にインシアネート基を
含有するウレタンプレポリマーなどの従来から硬化剤と
して使用されているものや、また硬化剤として使用可能
であるポリイソシアネートであればいずれも使用できる
。また、そのポリインクアネート系硬化剤の量は全結合
剤量の5〜80重量部用いる。Examples of such polyisocyanate curing agents include bifunctional incyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and hexane diisocyanate;
Trifunctional isocyanates such as Desmodur L (manufactured by Bayer AG), or urethane prepolymers containing incyanate groups at both ends, and those conventionally used as curing agents. Any available polyisocyanate can be used. The polyincanate curing agent is used in an amount of 5 to 80 parts by weight based on the total amount of binder.
本発明の磁気記録媒体は、例えば第1図に示すように、
ポリエチレンテレフタレート等の非磁性支持体1上に磁
性層2を有し、必要あればこの磁性層2とは反対側の面
にBCC20設けられている構成のものである。また、
第2図に示すように第1図の磁気記録媒体の磁性層2上
にオーバーコート層(QC層)4を設けてもよい。The magnetic recording medium of the present invention has, for example, as shown in FIG.
It has a magnetic layer 2 on a non-magnetic support 1 such as polyethylene terephthalate, and if necessary, a BCC 20 is provided on the opposite side of the magnetic layer 2. Also,
As shown in FIG. 2, an overcoat layer (QC layer) 4 may be provided on the magnetic layer 2 of the magnetic recording medium shown in FIG.
また、第1図、第2図の磁気記録媒体は、磁性層2と支
持体1との間に下引き層(図示せず)を設けたものであ
ってよく、或いは下引き層を設けな(てもよい。また支
持体にコロナ放電処理を施してもよい。Further, the magnetic recording media shown in FIGS. 1 and 2 may be provided with an undercoat layer (not shown) between the magnetic layer 2 and the support 1, or may be provided with no undercoat layer. (Also, the support may be subjected to corona discharge treatment.
磁性R2には、潤滑剤として、脂肪酸及び/又は脂肪酸
エステルを含有せしめることができる。Magnetic R2 can contain a fatty acid and/or a fatty acid ester as a lubricant.
これにより、両者の各特長を発拝させながら、単独使用
の場合に生ずる欠陥を相殺し、潤滑効果を向上させ、静
止画像耐久性、走行安定性、S/N比等を高めることが
できる。この場合、脂肪酸の添加量は、磁性粉100重
量部に対して0.2〜10重量部がよく、0.5〜8.
0重量部が更によい。この範囲を外れて脂肪酸が少なく
なると磁性粉の分散性が低下し、媒体の走行性も低下し
易(、また多くなると脂肪酸がしみ出したり、出力低下
が生じ易くなる。また、脂肪酸エステルの添加量は、磁
性粉100重量部に対して0.1〜10重量部がよく、
0.2〜8.5重量部が更によい。この範囲を外れてエ
ステルが少なくなると走行性改善の効果が乏しく、また
多(なるとエステルがしみ出したり、出力低下が生じ易
(なる。This allows the advantages of both to be exploited while canceling out the defects that occur when used alone, improving the lubrication effect, and improving still image durability, running stability, S/N ratio, etc. In this case, the amount of fatty acid added is preferably 0.2 to 10 parts by weight, preferably 0.5 to 8 parts by weight, per 100 parts by weight of the magnetic powder.
Even better is 0 parts by weight. If the fatty acid content is outside this range and the fatty acid content decreases, the dispersibility of the magnetic powder will decrease, and the runnability of the medium will also tend to decrease (and if the fatty acid content increases, the fatty acid will easily seep out and the output will decrease. Also, addition of fatty acid esters) The amount is preferably 0.1 to 10 parts by weight per 100 parts by weight of magnetic powder.
Even better is 0.2 to 8.5 parts by weight. If the amount of ester is outside this range, the effect of improving running performance will be poor, and if the amount is too high, the ester will easily seep out and the output will decrease.
また、上記の効果をより良好に奏するうえで。Also, to better achieve the above effects.
脂肪酸と脂肪酸エステルの重量比率は脂肪酸/脂肪酸エ
ステル= 10 / 90〜90 / 10が好ましい
。The weight ratio of fatty acid and fatty acid ester is preferably fatty acid/fatty acid ester = 10/90 to 90/10.
なお脂肪酸には分散作用的効果もあり、脂肪酸の使用に
よって別の低分子量の分散剤の使用量を低減させ、その
分だけ磁気記録媒体のヤング率を向上せしめることもで
きると考えられる。Note that fatty acids also have a dispersing effect, and it is thought that by using fatty acids, the amount of other low molecular weight dispersants used can be reduced, and the Young's modulus of the magnetic recording medium can be improved by that amount.
脂肪酸は一塩基性でありても二塩基性であってもよい。Fatty acids may be monobasic or dibasic.
炭素原子数6〜30、更には12〜22の脂肪酸が好ま
しい。脂肪酸を例示すると以下の通りである。Fatty acids having 6 to 30 carbon atoms, more preferably 12 to 22 carbon atoms, are preferred. Examples of fatty acids are as follows.
(1)カプロン酸
(2)カプリル酸
(3)カプリン酸
(4)ラウリン酸
(5)ミリスチン酸
(6)パルミチン酸
(7)ステアリン酸
(8)イソステアリン酸
(9)リルン酸
(10)リノール酸
(11)オレイン酸
(12)エライジン酸
(13)ベヘン酸
(14)マロン酸
(15)コノ・り酸
(16)マレイン酸
(17)グルタル酸
(18)アジピン酸
(19)ピメリン酸
(20)アゼライン酸
(21)セバシン酸
(22)1.12−ドデカンジカルボン酸(23)オク
タンジカルボン酸
上記の脂肪酸エステルの例は次の通りである。(1) Caproic acid (2) Caprylic acid (3) Capric acid (4) Lauric acid (5) Myristic acid (6) Palmitic acid (7) Stearic acid (8) Isostearic acid (9) Rilunic acid (10) Linoleic acid (11) Oleic acid (12) Elaidic acid (13) Behenic acid (14) Malonic acid (15) Cono-phosphoric acid (16) Maleic acid (17) Glutaric acid (18) Adipic acid (19) Pimelic acid (20) Azelaic acid (21) Sebacic acid (22) 1,12-dodecanedicarboxylic acid (23) Octanedicarboxylic acid Examples of the above fatty acid esters are as follows.
(1)オレイルオレート
(2)インセチルステアレート
(3)ジオレイルマレエート
(4)ブチルステアレート
(5)プチルパルミテート
(6)ブチルミリステート
(7)オクチルミリステート
(8)オクチルパルミテート
(9)アミルステアレート
(10)アミルパルミテート
(11)インブチルオレエート
(12)ステアリルステアレート
(13)ラウリルオレート
(14)オクチルオレート
(15)インブチルオレート
(16)エチルオレート
(17)イソトリデシルオレート
(18)2−エチルへキシルステアレート(19)エチ
ルステアレート
(20)2−エチルへキシルパルミテート(21)イン
プロピルパルミテート
(22)イソプロピルミリステート
(23)ブチルラウレート
(24)セチル−2−エチルへキサレート(25)ジオ
レイルアジペート
(26)ジエチルアジペート
(27)ジイソブチルアジペート
(28)ジイソデシルアジベート
(29)オレイルステアレート
(30)2−エチルヘキシルミリステートまた、上述し
た脂肪酸、脂肪酸エステル以外にも、他の潤滑剤(例え
ばシリコーンオイル、カルボン酸変性、エステル変性で
あってもよい)、グラファイト、フッ化カーボン、二硫
化モリブデン、二硫化タングステン、脂肪酸アミド、α
−オレフィンオキサイド等)等を磁性層に添加してよい
。(1) Oleyl oleate (2) Incetyl stearate (3) Dioleyl maleate (4) Butyl stearate (5) Butyl palmitate (6) Butyl myristate (7) Octyl myristate (8) Octyl palmitate ( 9) Amyl stearate (10) Amyl palmitate (11) Inbutyl oleate (12) Stearyl stearate (13) Lauryl oleate (14) Octyl oleate (15) Inbutyl oleate (16) Ethyl oleate (17) Isotri Decyl oleate (18) 2-ethylhexyl stearate (19) Ethyl stearate (20) 2-ethylhexyl palmitate (21) Impropyl palmitate (22) Isopropyl myristate (23) Butyl laurate (24) Cetyl-2-ethyl hexalate (25) dioleyl adipate (26) diethyl adipate (27) diisobutyl adipate (28) diisodecyl adipate (29) oleyl stearate (30) 2-ethylhexyl myristate Also, the above-mentioned fatty acids, fatty acids In addition to esters, other lubricants (for example, silicone oil, carboxylic acid modified, ester modified), graphite, carbon fluoride, molybdenum disulfide, tungsten disulfide, fatty acid amide, α
-olefin oxide, etc.) may be added to the magnetic layer.
また、他の非磁性研磨材粒子も添加可能であるが、これ
には酸化チタン、α−酸化鉄、酸化ケイ素、窒化ケイ素
、炭化ケイ素、酸化ジルコニウム、酸化亜鉛、酸化セリ
ウム、酸化マグネククム、窒化ホウ素等が使用される。Other non-magnetic abrasive particles can also be added, including titanium oxide, alpha-iron oxide, silicon oxide, silicon nitride, silicon carbide, zirconium oxide, zinc oxide, cerium oxide, magnecum oxide, boron nitride. etc. are used.
この研磨材の平均粒子径は0.6μmがよく、0.3μ
m以下が更によい。The average particle diameter of this abrasive material is preferably 0.6 μm, and 0.3 μm.
m or less is even better.
また、磁性層には更に、グラファイト等の帯電防止剤、
粉レシチン、リン酸エステル等の分散剤を添加すること
ができる。In addition, the magnetic layer further contains an antistatic agent such as graphite.
A dispersing agent such as powdered lecithin or phosphate ester can be added.
また、バックコート層中に含有せしめる非磁性粒子は、
平均粒径を10mμ〜1000 mμの範囲内とすると
より好ましい。上記範囲内であれば非磁性粒子が細かく
なりすぎることもなく、添加効果が良好だからである。In addition, the non-magnetic particles contained in the back coat layer are
It is more preferable that the average particle size is within the range of 10 mμ to 1000 mμ. This is because within the above range, the non-magnetic particles will not become too fine and the addition effect will be good.
非磁性粒子としては、酸化ケイ素、酸化チタン。Non-magnetic particles include silicon oxide and titanium oxide.
酸化アルミニウム、酸化クロム、炭化珪素、炭化カルシ
ウム、酸化亜鉛、α−Fe=O−、タルク、カオリン、
硫酸カルシウム、窒化ホウ素、フッ化亜鉛、二酸化モリ
ブデン、炭化カルシウム、硫酸バリウム等からなるもの
が挙げられる。また、その他にも、有機粉末、例えばベ
ンゾグアナミン系樹脂、メラミン系樹脂、フタロシアニ
ン系顔料等も使用可能であり、有機粉末と前記の無機粉
末とも併用することもできる。Aluminum oxide, chromium oxide, silicon carbide, calcium carbide, zinc oxide, α-Fe=O-, talc, kaolin,
Examples thereof include calcium sulfate, boron nitride, zinc fluoride, molybdenum dioxide, calcium carbide, barium sulfate, and the like. In addition, organic powders such as benzoguanamine resins, melamine resins, phthalocyanine pigments, etc. can also be used, and organic powders and the above-mentioned inorganic powders can also be used in combination.
更に、上述の非磁性粒子と共にカーボンブラックを併用
することがより好ましい。これにより媒体の走行性を更
に安定せしめ、前記した非磁性粒子の作用と相まって媒
体の耐久性を更に向上せしめることが可能である。Furthermore, it is more preferable to use carbon black together with the above-mentioned non-magnetic particles. This further stabilizes the running properties of the medium, and in combination with the effect of the non-magnetic particles described above, it is possible to further improve the durability of the medium.
ホ、実施例 以下、本発明の詳細な説明する。E, Example The present invention will be explained in detail below.
以下に示す成分、割合、操作頴序等は、本発明の精神か
ら逸脱しない範囲において種々変更しうる。なお、下記
の実施例において「部」はすべて重量部を表す。The components, proportions, operating procedures, etc. shown below may be changed in various ways without departing from the spirit of the invention. In addition, in the following examples, all "parts" represent parts by weight.
まず、支持体である厚さ10μmのポリエチレンテレフ
タレートベースフィルム上に磁性層ヲ次の要領で形成し
た。First, a magnetic layer was formed on a polyethylene terephthalate base film having a thickness of 10 μm as a support in the following manner.
即ち、所定の合金金属磁性粉を使用し、第3図に示す各
成分を分散させた後、この磁性塗料を1μmフィルター
で濾過し、多官能インシアネート5部を添加し、支持体
上に2.5μmに塗布してスーパーカレンダーをかけ、
第3図に表示した各種組成を有する磁性層とした。That is, after using a predetermined alloy metal magnetic powder and dispersing each of the components shown in FIG. Apply to .5μm and apply super calendar.
Magnetic layers having various compositions shown in FIG. 3 were prepared.
但し、合金金属磁性粉におけるAl含有量は、それぞれ
5原子チとした。However, the Al content in each alloy metal magnetic powder was 5 atoms.
しかる後、次の組成のBC層用塗料を磁性層の反対側の
面に乾燥厚さ0.4μmになるように塗布した。Thereafter, a paint for the BC layer having the following composition was applied to the opposite surface of the magnetic layer to a dry thickness of 0.4 μm.
カーボンブラック 40部(平均粒
径50mμ)
硫酸バリウム 10部ニトロセ
ルロース 25部N−2301(日
本ポリウレタン製)25部コロネートL() 10
部
シクロヘキサノン 400部メチルエ
チルケトン 250部トルエン
250部このようにして所定厚さの
磁性層、80層を有する幅広の硼性フィルムを得、これ
を巻き取った。Carbon black 40 parts (average particle size 50 mμ) Barium sulfate 10 parts Nitrocellulose 25 parts N-2301 (made by Nippon Polyurethane) 25 parts Coronate L () 10
Cyclohexanone 400 parts Methyl ethyl ketone 250 parts Toluene
250 parts A wide borous film having 80 magnetic layers of a predetermined thickness was thus obtained and wound up.
このフィルムを8M幅に断裁し、第3図の各ビデオテー
プとした(各実施例、比較例の番号に対応する。)。但
し、第3図の第2欄以後の数値は重量部を表わす。This film was cut into a width of 8M to make each videotape shown in FIG. 3 (corresponding to the numbers of each example and comparative example). However, the numbers after the second column in FIG. 3 represent parts by weight.
なお、テープの傷の発生頻度の測定の際には1/2イン
チ(12,65m )巾のビデオテープとした。In addition, when measuring the frequency of scratches on the tape, a 1/2 inch (12.65 m 2 ) wide video tape was used.
以上のようにして得られたテープの性能を測定した結果
を第3図に示す。但し、評価項目は次の基準に従って測
定され、表示されている。The results of measuring the performance of the tape obtained as described above are shown in FIG. However, evaluation items are measured and displayed according to the following standards.
平均表面粗さRa:小板研究所製の三次元表面粗さ計(
3FK)にて測定した(カットオフは0.25mm )
c+
ルミS/N:カラービデオノイズメーター「5hiba
soku 925 D / I Jにより測定した。/
Sイパスフィルターハ10Ktlz、ローパスフィルタ
ーは4.2M1(zで行りた。VTRは8Mビデオデツ
キを使用した。Average surface roughness Ra: Three-dimensional surface roughness meter manufactured by Koita Research Institute (
3FK) (cutoff is 0.25mm)
c+ Lumi S/N: Color video noise meter "5hiba"
Measured using soku 925 D/IJ. /
The S pass filter was set to 10Ktlz, and the low pass filter was set to 4.2M1 (z).The VTR used was an 8M video deck.
静止画像寿命:静止画像が2dB低下するまでの時間を
1分車位で示す。値が大きい程磁気記録媒体の耐久性、
耐摩耗性が高い。Still image lifespan: Indicates the time it takes for a still image to deteriorate by 2 dB in 1 minute positions. The larger the value, the more durable the magnetic recording medium is.
High wear resistance.
テープの傷の発生頻度:
市販のVH8方式VTRを用い、テープをセットして1
分間走行させた。その後、走行を停止してテープを取り
出し、走行した部分、ローディング、アンローディング
に使用された部分を目視にて検査し、テープ表面に傷が
有るか否かを調査しテープの傷の発生頻度=
傷のありだ回数/試験回数X 100 (チ)として求
める。試験回数は20回界上行うものとした。Frequency of scratches on tape: Using a commercially available VH8 type VTR, set the tape and
I ran it for a minute. After that, the running was stopped, the tape was taken out, and the running part and the part used for loading and unloading were visually inspected to determine whether there were any scratches on the tape surface. Calculate as: number of scratches/number of tests x 100 (h). The test was conducted 20 times.
粉落ち240℃、80チにて200時間連続して試料テ
ープをビデオデツキで走行させて、粉落ちを測定した。Powder drop The sample tape was run continuously on a video deck at 240° C. and 80 inches for 200 hours to measure powder drop.
◎ 非常に良好 10
良好
Δ やや良好
X 不良
磁気ヘッドの目詰り240℃、80%にて200時間連
続して試料テープをビデオデツキで走行させて、磁気ヘ
ッドの目詰りを測定した。◎ Very good 10
Good Δ Fairly good
◎ 非常に良好
○ 良好
Δ やや良好
X 不良
第3図に示す結果から1本発明に基づいて磁気テープを
構成することによって、テープ性能が著しく向上するこ
とが分る。即ち、金属磁性粉のBET値を45m1/g
以上とすること、カーボンブラックの平均粒径を40〜
400 mμとすること、α−アルミナの平均粒径を0
.4μm以下とすること、三酸化二クロムの平均粒径な
0.5μm以下とすること、α−アルミナと三酸化二ク
ロムの含有量比を限定することは、極めて重要である。◎ Very good ○ Good ∆ Fairly good That is, the BET value of metal magnetic powder is 45 m1/g.
or more, and the average particle size of carbon black is 40~
400 mμ, and the average particle size of α-alumina is 0.
.. It is extremely important to limit the average particle size of dichromium trioxide to 0.5 μm or less, and to limit the content ratio of α-alumina and dichromium trioxide.
第1図、第2図は本発明の磁気記録媒体の例を示す部分
拡大断面図である。
第3図は磁性層の組成による特性変化を示すグラフであ
る。
なお1図面に示す符号において。
1・・・・・・・・・非磁性支持体
2・・・・・・・・・磁性層
3・・・・・・・・・バックコート層(80層)4・・
・・・・・・・オーバーコート層(QC層)である。
代理人 弁理士 逢 坂 宏FIGS. 1 and 2 are partially enlarged sectional views showing examples of the magnetic recording medium of the present invention. FIG. 3 is a graph showing changes in characteristics depending on the composition of the magnetic layer. In addition, in the reference numerals shown in the first drawing. 1...Nonmagnetic support 2...Magnetic layer 3...Back coat layer (80 layers) 4...
...... Overcoat layer (QC layer). Agent Patent Attorney Hiroshi Aisaka
Claims (1)
磁性層に含有されている磁気記録媒体において、前記金
属磁性粉の比表面積が45m^2/g以上であり、平均
粒径が40mμ以上、400mμ以下であるカーボンブ
ラックと、平均粒径が0.4μm以下であるα−三酸化
二アルミニウムと、平均粒径が0.5μm以下である三
酸化二クロムとが前記磁性層に含有され、かつ前記α−
三酸化二アルミニウムと前記三酸化二クロムとの含有量
比(α−三酸化二アルミニウム:三酸化二クロム)が重
量比で(15:85)〜(85:15)であることを特
徴とする磁気記録媒体。1. In a magnetic recording medium in which a magnetic layer contains a binder and metal magnetic powder dispersed in the binder, the metal magnetic powder has a specific surface area of 45 m^2/g or more and an average particle size carbon black having a diameter of 40 mμ or more and 400 mμ or less, α-dialuminium trioxide having an average particle size of 0.4 μm or less, and dichromium trioxide having an average particle size of 0.5 μm or less are included in the magnetic layer. and the α-
It is characterized in that the content ratio of dialuminum trioxide and the dichromium trioxide (α-dialium trioxide: dichromium trioxide) is (15:85) to (85:15) by weight. magnetic recording medium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2097988A JPH01196724A (en) | 1988-01-29 | 1988-01-29 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2097988A JPH01196724A (en) | 1988-01-29 | 1988-01-29 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01196724A true JPH01196724A (en) | 1989-08-08 |
Family
ID=12042278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2097988A Pending JPH01196724A (en) | 1988-01-29 | 1988-01-29 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01196724A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03203019A (en) * | 1989-12-28 | 1991-09-04 | Konica Corp | Discoid magnetic recording medium |
JPH05128494A (en) * | 1991-10-11 | 1993-05-25 | Columbia Magune Prod Kk | Magnetic recording medium |
-
1988
- 1988-01-29 JP JP2097988A patent/JPH01196724A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03203019A (en) * | 1989-12-28 | 1991-09-04 | Konica Corp | Discoid magnetic recording medium |
JPH05128494A (en) * | 1991-10-11 | 1993-05-25 | Columbia Magune Prod Kk | Magnetic recording medium |
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