JPH02257425A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH02257425A JPH02257425A JP32186089A JP32186089A JPH02257425A JP H02257425 A JPH02257425 A JP H02257425A JP 32186089 A JP32186089 A JP 32186089A JP 32186089 A JP32186089 A JP 32186089A JP H02257425 A JPH02257425 A JP H02257425A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- magnetic
- medium
- parts
- acid
- 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 65
- -1 polyethylene terephthalate Polymers 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000000428 dust Substances 0.000 abstract description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 abstract description 2
- 239000005020 polyethylene terephthalate Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 abstract 6
- 239000011247 coating layer Substances 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 239000003973 paint Substances 0.000 description 29
- 239000006247 magnetic powder Substances 0.000 description 23
- 239000006229 carbon black Substances 0.000 description 20
- 235000019241 carbon black Nutrition 0.000 description 20
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 18
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 18
- 239000002245 particle Substances 0.000 description 17
- 235000014113 dietary fatty acids Nutrition 0.000 description 16
- 239000000194 fatty acid Substances 0.000 description 16
- 229930195729 fatty acid Natural products 0.000 description 16
- 229920005989 resin Polymers 0.000 description 16
- 239000011347 resin Substances 0.000 description 16
- 150000004665 fatty acids Chemical class 0.000 description 11
- 239000000843 powder Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 239000000178 monomer Substances 0.000 description 9
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 8
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 8
- 239000004814 polyurethane Substances 0.000 description 8
- 229920002635 polyurethane Polymers 0.000 description 8
- 229910052700 potassium Inorganic materials 0.000 description 8
- 239000011591 potassium Substances 0.000 description 8
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 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 6
- 229920001228 polyisocyanate Polymers 0.000 description 6
- 239000005056 polyisocyanate Substances 0.000 description 6
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 5
- 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 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 5
- 229910052783 alkali metal Chemical group 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 5
- 239000006249 magnetic particle Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- LGEZTMRIZWCDLW-UHFFFAOYSA-N 14-methylpentadecyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCCCCCCCCCCC(C)C LGEZTMRIZWCDLW-UHFFFAOYSA-N 0.000 description 4
- 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 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 235000021360 Myristic acid Nutrition 0.000 description 4
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 4
- 150000001340 alkali metals Chemical group 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
- 239000012948 isocyanate Substances 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000008117 stearic acid 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
- XDOFQFKRPWOURC-UHFFFAOYSA-N 16-methylheptadecanoic acid Chemical compound CC(C)CCCCCCCCCCCCCCC(O)=O XDOFQFKRPWOURC-UHFFFAOYSA-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
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920001220 nitrocellulos Polymers 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-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
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 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
- 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
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 2
- 238000005452 bending Methods 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
- 229910052796 boron Inorganic materials 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
- 229910000420 cerium oxide Inorganic materials 0.000 description 2
- 229940090961 chromium dioxide Drugs 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
- 230000029087 digestion Effects 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
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- 229920006287 phenoxy resin Polymers 0.000 description 2
- 239000013034 phenoxy resin Substances 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000642 polymer Polymers 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
- 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
- HQHCYKULIHKCEB-UHFFFAOYSA-N tetradecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCCC(O)=O HQHCYKULIHKCEB-UHFFFAOYSA-N 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-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
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- JHPBZFOKBAGZBL-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylprop-2-enoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)=C JHPBZFOKBAGZBL-UHFFFAOYSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-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
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-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
- GVNVAWHJIKLAGL-UHFFFAOYSA-N 2-(cyclohexen-1-yl)cyclohexan-1-one Chemical compound O=C1CCCCC1C1=CCCCC1 GVNVAWHJIKLAGL-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
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- 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 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
- 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
- 229910052580 B4C Inorganic materials 0.000 description 1
- 235000021357 Behenic acid Nutrition 0.000 description 1
- 101100257696 Caenorhabditis elegans srf-3 gene Proteins 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
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 101150065749 Churc1 gene Proteins 0.000 description 1
- LVGKNOAMLMIIKO-UHFFFAOYSA-N Elaidinsaeure-aethylester Natural products CCCCCCCCC=CCCCCCCCC(=O)OCC LVGKNOAMLMIIKO-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
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、磁気デイ□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
一般に、磁気テープ等の磁気記録媒体は、磁性粉、バイ
ンダー樹脂等からなる磁性塗料を支持体上に塗布、乾燥
することによって製造される。BACKGROUND OF THE INVENTION Generally, magnetic recording media such as magnetic tapes are manufactured by applying a magnetic paint made of magnetic powder, binder resin, etc. onto a support and drying it.
近年、磁気記録媒体、特に短波長記録を要求されるビデ
オ用磁気記録媒体においては、今まで以上に微粒子化、
高磁力化された磁性粉が使用される傾向が強くなってい
る。また、スペーシングロスをなくすため、磁性層の表
面を平滑としたり、ベースフィルムに平滑化処理を施し
たりすることが行われている。このため、媒体の摩擦係
数が増大し、走行性が劣化して、例えばテープの貼り付
き、エツジ折れ、スティックスリップ等を生じていた。In recent years, magnetic recording media, especially video magnetic recording media that require short wavelength recording, have become more fine-grained than ever before.
There is a growing tendency to use magnetic powder with high magnetic force. Furthermore, in order to eliminate spacing loss, the surface of the magnetic layer is smoothed or the base film is subjected to a smoothing treatment. As a result, the friction coefficient of the medium increases and the running performance deteriorates, resulting in, for example, tape sticking, edge bending, stick-slip, and the like.
また、特に磁性粉表面の改質を行うと、磁性粉の導電性
が失われ、表面比抵抗が増大し、媒体の走行性が更に劣
化すると共にホコリを引き付は易くなり、ドロップアウ
トを生じていた。In addition, when the magnetic powder surface is modified in particular, the conductivity of the magnetic powder is lost and the surface resistivity increases, further deteriorating the running properties of the medium and making it easier to attract dust, resulting in dropouts. was.
他方、媒体の高周波域と低周波域とにおける磁気記録特
性を共に向上させ、均衡させるべく、複数の磁気記録層
を有する媒体が提案されている（特開昭５９−１７２１
４２号、特公昭３２−２２１８号、特開昭５１−６４９
０１号、特公昭５６−１２９３７号各公報等）。On the other hand, a medium having a plurality of magnetic recording layers has been proposed in order to improve and balance the magnetic recording characteristics of the medium in both the high frequency range and the low frequency range (Japanese Patent Laid-Open No. 59-1721).
No. 42, Japanese Patent Publication No. 32-2218, Japanese Patent Publication No. 51-649
No. 01, Japanese Patent Publication No. 56-12937, etc.).
、しかし、上述のような媒体の走行性、帯電等の問題に
ついては検討されていない。However, problems such as the above-mentioned running properties and charging of the medium have not been studied.
ハ０発明の目的
本発明の目的は、電磁変換特性、導電性及び走行性に優
れた磁気記録媒体を提供することである。OBJECT OF THE INVENTION An object of the present invention is to provide a magnetic recording medium with excellent electromagnetic conversion characteristics, conductivity, and runnability.
ニ０発明の構成及びその作用効果
本発明は、非磁性支持体上に複数の層を設けてなる磁気
記録媒体において、動摩擦係数が０．２５以下でありか
つ表面比抵抗が１．ＯＸ １０’Ω／ｓｑ以下であるこ
とを特徴とする磁気記録媒体に係るものである。D0 Structure of the invention and its effects The present invention provides a magnetic recording medium comprising a plurality of layers on a non-magnetic support, which has a dynamic friction coefficient of 0.25 or less and a surface resistivity of 1. The present invention relates to a magnetic recording medium characterized in that OX is 10'Ω/sq or less.
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からなる非磁性支持体１
上に第一の層２を有し、かつ第一の層２上に第二の層４
を設けたものである。また、層２と反対側の面にはバッ
クコート層（ＢＣ層）３が設けられている。第一の層２
、第二の層４は共に磁性層であってよく、また第一の層
２は導電性非磁性粉体等を含んだ樹脂層であってよい、
第一の層２と非磁性支持体１との間に下引き層を設けて
もよ（、非磁性支持体１にコロナ放電処理を施してもよ
い、第二の層４上にオーバーコート層を設けてもよい、
バックコート層３は必ずしも必要ない、第一０層２の膜
厚は０．５〜５．０μｍ、好ましくは１．０〜４．０μ
ｍであり、第二の層４の膜厚は０．１〜２．０ ｐｍ、
好ましくは０．３〜１．５ ａｍである。The magnetic recording medium of the present invention has, for example, as shown in FIG.
Non-magnetic support 1 made of polyethylene terephthalate etc.
a first layer 2 on top, and a second layer 4 on the first layer 2
It has been established. Further, a back coat layer (BC layer) 3 is provided on the surface opposite to the layer 2. first layer 2
, the second layer 4 may both be magnetic layers, and the first layer 2 may be a resin layer containing conductive non-magnetic powder or the like.
An undercoat layer may be provided between the first layer 2 and the non-magnetic support 1 (a subbing layer may be provided on the non-magnetic support 1), and an overcoat layer may be provided on the second layer 4. may be provided,
The back coat layer 3 is not necessarily necessary, and the thickness of the first layer 2 is 0.5 to 5.0 μm, preferably 1.0 to 4.0 μm.
m, and the film thickness of the second layer 4 is 0.1 to 2.0 pm,
Preferably it is 0.3-1.5 am.
本発明の磁気記録媒体によれば、媒体の動摩擦係数を０
．２５以下（好ましくは０．１０以上）としであるので
、媒体の走行性が良好となる。かつ、媒体の表面比抵抗
を１．ＯＸ １０’Ω／ｓｑ以下（更に好ましくは１．
０Ｘ１０” 〜１．０Ｘ１０−Ω／ＳＱ）としであるの
で、媒体の帯電が生じ難く、ヘッド等に対する貼り付き
等を生じず、かつホコリが付着し難いのでドロップアウ
トが著しく減少し、上記の媒体の摩擦係数の限定と相ま
って走行性が著しく向上する。According to the magnetic recording medium of the present invention, the coefficient of dynamic friction of the medium can be reduced to 0.
．． Since it is 25 or less (preferably 0.10 or more), the running properties of the medium are good. And the surface specific resistance of the medium is 1. OX 10'Ω/sq or less (more preferably 1.
0 x 10" to 1.0 Coupled with the limited friction coefficient, running performance is significantly improved.
しかも、かかる構成を複数層の磁気記録媒体において実
現したことが画期的なのであり、例えば単一の磁性層中
に多量の導電性カーボンブラック、非磁性研磨剤粒子を
含有させるような手段では、仮に摩擦係数、表、固化抵
抗値を下げ得たとしても、磁性層中の磁性粉充填率が低
下し、電磁変換特性が著しく低下するのである。Moreover, it is revolutionary that such a configuration has been realized in a multi-layer magnetic recording medium. For example, by incorporating a large amount of conductive carbon black or non-magnetic abrasive particles into a single magnetic layer, Even if it were possible to lower the friction coefficient, surface resistance, and solidification resistance value, the magnetic powder filling rate in the magnetic layer would decrease, and the electromagnetic conversion characteristics would drop significantly.
本発明の磁気記録媒体を実現するには、具体的には、例
えば最上層（第１図においては、第二の層４）に平均−
成粒径４０〜３００ｍμ（好ましくは４０〜１００ｍμ
、更に好ましくは４０〜７０ｍμ）のカーボンブラック
を含有させることができる。□このカーボンブラックの
含有量は、磁性粉１００重量部（以下次頁に続く）
に対し０．１〜５重量部とするのが好ましく、０．１〜
３重量部とすると更に好ましい。かかる粒径の大きいカ
ーボンブラックを使用することにより、第二の層４の動
摩擦係数を低減できる。かつ、粒径の大きいことから、
含有量をさほど多くしなくとも摩擦係数を低くできるた
め、その分磁性粉の含有率を高めることができ、電磁変
換特性向上に有利である。In order to realize the magnetic recording medium of the present invention, specifically, for example, the uppermost layer (second layer 4 in FIG. 1) has an average -
Particle size: 40 to 300 mμ (preferably 40 to 100 mμ)
, more preferably 40 to 70 mμ). □The content of this carbon black is preferably 0.1 to 5 parts by weight, and 0.1 to 5 parts by weight per 100 parts by weight of magnetic powder (continued on the next page).
It is more preferable to use 3 parts by weight. By using carbon black with such a large particle size, the coefficient of dynamic friction of the second layer 4 can be reduced. In addition, due to the large particle size,
Since the friction coefficient can be lowered without increasing the content so much, the content of magnetic powder can be increased accordingly, which is advantageous for improving electromagnetic conversion characteristics.
また、最上層以外の磁性層（第１図の例では第一の層２
）に、導電性カーボンブラックを磁性粉以下とすること
ができる。更に、最上層以外の層に、導電性の高い二酸
化クロム強磁性微粉末を含以下とすることができる。In addition, magnetic layers other than the top layer (in the example of FIG. 1, the first layer 2
), the conductive carbon black can be made smaller than the magnetic powder. Furthermore, layers other than the top layer may contain chromium dioxide ferromagnetic fine powder having high conductivity.
更に、最上層以外の非磁性層（第１図の例ではとするこ
とができる。Furthermore, a non-magnetic layer other than the top layer (in the example of FIG. 1) may be used.
磁気記録媒体の具体的構成について更に述べる。The specific structure of the magnetic recording medium will be further described.
第１図の磁気記録媒体において、第一の層２の膜厚は１
．５〜３．０μｍとすると好ましく、第二の層４の膜厚
は０．５〜１．５μｌとすると好ましい。In the magnetic recording medium shown in FIG. 1, the thickness of the first layer 2 is 1
．． The thickness of the second layer 4 is preferably 5 to 3.0 μm, and the thickness of the second layer 4 is preferably 0.5 to 1.5 μl.
媒体の各層には磁性粉を含有せしめうる。磁性粉として
は、ｒ Ｆｅｗ Ｏ，ｚ、Ｆｅｓ Ｏａ、これらの中
間酸化物、或いはこれら酸化鉄磁性粉にコバルト原子を
ドープ又は被着させたコバルト含有酸化鉄磁性粉、強磁
性二酸化クロム粉末、窒化鉄、炭化鉄、合金金属磁性粉
、バリウムフェライト或いはこれをチタン、コバルト等
の金属で変性したもの等が挙げられる。Each layer of the medium may contain magnetic powder. Examples of magnetic powder include r Few O, z, Fes Oa, intermediate oxides thereof, cobalt-containing iron oxide magnetic powder obtained by doping or depositing cobalt atoms on these iron oxide magnetic powders, ferromagnetic chromium dioxide powder, nitrided Examples include iron, iron carbide, alloy metal magnetic powder, barium ferrite, and those modified with metals such as titanium and cobalt.
磁性粉の比表面積はＢＥＴ値で３０〜８０ｒｒｆ／ｇと
すると好ましり、３５〜６０ｒｒｆ／ｇとすると更に好
ましい、磁性粉の抗磁力（Ｈｃ）は６００〜１２００エ
ルステツドとすることが好ましい。The specific surface area of the magnetic powder is preferably 30 to 80 rrf/g in BET value, more preferably 35 to 60 rrf/g, and the coercive force (Hc) of the magnetic powder is preferably 600 to 1200 oersteds.
上記の比表面積はＢＥＴ値で表され、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／ｒｒｆに設定し、窒素によ
り液体窒素温度（−１９５℃）で吸着測定を行う（一般
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、 Ａａ＋ｅ、 Ｃｈｅｗ、 Ｓｏｃ、 ６０
３０９ （１９３８）を参照）。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 diameter.For example, even if the average particle diameter is the same, there are Some have a small surface area. To measure the specific surface area, for example, first, heat the powder at around 250°C for 30 to 30 minutes.
The powder was degassed while being heated for 60 minutes to remove what was adsorbed to the powder, and then introduced into the measuring device, and the initial pressure of nitrogen was set at 0.5 kg/rrf, and the nitrogen was used to cool the liquid. Adsorption measurement is carried out at nitrogen temperature (-195°C) (Specific surface area measurement method generally referred to as B, E, T method, details J, Aa+e, Chew, Soc, 60
309 (1938)).
この比表面積（ＢＥＴ値）の測定装置には、温浸電池■
ならびに温浸アイオニクス■の共同製造による「粉粒体
測定装置（カンタ−ソープ）」を使用することができる
。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、 Ｆｌ、 ０ＡＬＬＡＶＡＬＬ
ｆＥ、 ＣＬＹＤＥＯＲＲＪｒ共著、弁田その他訳；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、日本化学余振、
丸善■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（
ｎｆ／ｇｒ）と記載しているが、本明細書における比表
面積と同一のものである。）。This specific surface area (BET value) measuring device uses a digestion battery.
It is also possible to use the "powder measuring device (Canterthorpe)" manufactured jointly by Digestion Ionics (1). For a general explanation of the specific surface area and its measurement method, see "Measurement of Granules" J, Fl, 0ALLAVALL
fE, co-authored by CLYDEORR Jr., translated by Benta et al.; published by Sangyo Toshosha).
Maruzen (issued on April 30, 1966) also describes it (in addition, in the above-mentioned "Chemistry Handbook", specific surface area is simply referred to as surface area (
nf/gr), which is the same as the specific surface area in this specification. ).
前記した、非磁性支持体上に設けられた最上層に含有さ
せるべき平均−次粒径４０〜４００ ｍμのカーボンブ
ラックとしては、例えば旭カーボンブラック製旭＃６０
（５１ｍμ）、旭＃５５ （７７ｍμ）、旭サーマル
（９０ｍμ）、旭＃５０ （９４ｍμ）、旭＃３５（１
１５ｍμ）、三菱化成製ダイアブラックＧ（８４ｍμ）
、カボット（Ｃａｂｏｔ）製し−ガル（ＲＥＧＡＬ）
ＳＲＦ−３（６０ｍμ） 、＃２２Ｂ、 ＃２０、＃３
５００（以上、４０ｍμ）、スターリング（ＳＴＥＲＬ
ＩＮＧ） Ｎ Ｓ（７５ｍμ）、電気化学社製のＨＳ
１００ （５３ｍ ｕ ）等がある。これらのうち二種
以上を併用してもよい。As the above-mentioned carbon black having an average primary particle size of 40 to 400 mμ to be contained in the uppermost layer provided on the non-magnetic support, for example, Asahi #60 manufactured by Asahi Carbon Black is used.
(51mμ), Asahi #55 (77mμ), Asahi Thermal (90mμ), Asahi #50 (94mμ), Asahi #35 (1
15mμ), Mitsubishi Kasei Diablack G (84mμ)
, REGAL manufactured by Cabot
SRF-3 (60mμ), #22B, #20, #3
500 (more than 40 mμ), sterling (STERL)
ING) N S (75 mμ), HS manufactured by Denki Kagaku Co., Ltd.
100 (53 m u ) etc. Two or more of these may be used in combination.
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ｒｃＡＲＢＯＮ Ｂ
ＬＡＣＫ 年鑑１９８４４ （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
ク協会曙）、及び「新実験化学講座第１８巻」 （日本
化学余振、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 direct selective counting using an electron microscope, or may be measured from the particle size distribution using a laser beam, etc., or it may be measured as spherical from the specific surface area. It can also be calculated. Other known methods can also be used. For details, see rcARBON B
See LACK Yearbook 19844 (published by Carbon Black Association), [Carbon Black Handbook] (Akebono Carbon Black Association), and "New Experimental Chemistry Course Volume 18" (Nippon Kagaku Yoshin, 1978, published by Maruzen Co., Ltd.), etc. can.
また、導電性、遮光性カーボンブラックとして公知のも
のを使用できる。Also, known conductive and light-shielding carbon blacks can be used.
非磁性支持体上に設けられた複数層のうち最上層以外の
層に非磁性導電性微粉末を含有させる場合、樹脂１００
重量部に対し３０−４０重量部とすることが好ましい、
非磁性導電性微粒子としては、グラファイト、酸化チタ
ン、酸化亜鉛、硫化亜鉛、酸化マグネシウム、二酸化ス
ズ、酸化セリウム、α−酸化鉄、炭化モリブデン、炭化
ホウ素、硫酸バリウム等を例示できる。When a non-magnetic conductive fine powder is contained in a layer other than the uppermost layer among multiple layers provided on a non-magnetic support, resin 100
Preferably, the amount is 30-40 parts by weight.
Examples of nonmagnetic conductive fine particles include graphite, titanium oxide, zinc oxide, zinc sulfide, magnesium oxide, tin dioxide, cerium oxide, α-iron oxide, molybdenum carbide, boron carbide, barium sulfate, and the like.
媒体の各層に使用可能な結合剤としては、平均分子量が
約１００００〜２０００００のもので、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−アクリロニトリル共重合体、ウ
レタン樹脂、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。Binders that can be used in each layer of the medium have an average molecular weight of about 10,000 to 200,000, such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, Urethane resin, butadiene-acrylonitrile copolymer,
Polyamide resin, polyvinyl butyral, cellulose derivatives (cellulose acetate butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, nitrocellulose, etc.), styrene-butadiene copolymer, polyester resin, various synthetic rubbers, phenolic resin, Epoxy resins, urea resins, melamine resins, phenoxy resins, silicone resins, acrylic reactive resins, mixtures of high molecular weight polyester resins and isocyanate prepolymers, mixtures of polyester polyols and polyisocyanates, urea formaldehyde resins, low molecular weight glycols/high molecular weight diols /isocyanate mixtures, and mixtures thereof.
これらの結合剤は、−３ｏ、Ｍ、−ＣＯＯＭ。These binders are -3o, M, -COOM.
−ＰＯ（ＯＭ’）ｚ （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
、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、ひいては媒体の耐久
性をも向上させ得る。-PO(OM')z (where M is hydrogen or an alkali metal such as lithium, potassium, or sodium; M' is an alkali metal such as hydrogen, lithium, potassium, or sodium, or a hydrocarbon residue); In other words, these resins have polar groups in their molecules that improve their compatibility with the magnetic powder, which further improves the dispersibility of the magnetic powder and also prevents the agglomeration of the magnetic powder. As a result, the stability of the coating liquid can be further improved, and the durability of the medium can also be improved.
こうした結合剤、特に塩化ビニル系共重合体は塩化ビニ
ルモノマー、スルホン酸若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。Such a binder, especially a 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, if necessary, other copolymerizable monomers. can.
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、か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若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 preferable 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上ツマ−として
は、
ＣＨｔ ミＣＨ３０，Ｍ
ＣＨｚ ＝ ＣＨＣＨｚ Ｓ ０３ ＭＣＨ２＝Ｃ（Ｃ
Ｌ ）ＣＨ，Ｓｏ、Ｍ
ＣＨｚ −ＣＨＣＨ！ ０ＣＯＣＨ（ＣＨｔ Ｃ００Ｒ
）Ｓｏ、Ｍ
ＣＨｚ −ＣＨＣＨｚ ＯＣＨｚ ＣＨ（ＯＨ）ＣＨ＊
ＳＯ＊Ｍ
ＣＨｌ −Ｃ（ｃＨ，）ＣＯＯＣ，Ｈ，ＳＯ，ＭＣＨｚ
−ＣＨＣＯＯＣ−Ｈｓ Ｓ Ｏｓ ＭＣＨｚ ＝ＣＨ
Ｃ０ＮＨＣ（ＣＨｓ ）！ ＣＨｚ ＳＯｓ Ｍが挙げ
られる。The above-mentioned copolymerizable polymer containing a sulfonate is CHt CH30, M CHz = CHCHz S 03 MCH2=C(C
L ) CH, So, M CHz -CHCH! 0COCH(CHt C00R
) So, M CHz -CHCHz OCHz CH(OH)CH*
SO*M CHl -C(cH,)COOC,H,SO,MCHz
-CHCOOC-Hs S Os MCHz =CH
C0NHC (CHs)! CHz SOs M may be mentioned.
またリン酸塩としては、
ＣＨｚ ＝ＣＨＣＨｚ ０ＣＨｚ ＣＨ（ＯＨ）ＣＨｚ
−０−ＰＯ，ＭＹ’
ＣＨｔ −ＣＨＣｏＮＨＣＣＣＨｓ ）ｚ ＣＨｌ−〇
−ＰＯ！ ＭＹ冨
ＣＨｚ ＝ ＣＨＣＨｚ ＜ト０ （ＣＨｌ ｃＨｔ
ｏ） ｎＰＯ，ＭＸ’
ＣＨｔ −ＣＨＣＨｚ Ｏ（ＣＨ，ＣＨｌ ０）ｍＰＯ
，ＭＸ！
上記に於いてＭはアルカリ金属、Ｒは炭化原子数１〜２
０個のアルキル基、ＹｌはＨ，Ｍ又はｃｏｇ ＝ＣＨＣ
Ｈｘ ＯＣＨ，ＣＨ（ＯＨ）ＣＨ，−Ｙ２はＨ，Ｍ又は
ＣＨ，＝ＣＨＣ０ＮＨＣＣＣＨ３）！ ＣＨＩ −Ｘｌ
は
ＣＨｚ ＝ ＣＨＣＨｔ％ Ｏ（ＣＨ！ ＣＨ２０）
ｎ−ＯＨ又はＯＭ、Ｘｌは
ＣＨｌ ＝ＣＨＣＨ＊ ＯＣＣＨｔ ＣＨｚ Ｏ）ｍ−
ＯＨ又はＯＭである。またｎは１〜１００、ｍは１〜１
００の正数である。Also, as a phosphate, CHz = CHCHz 0CHZ CH(OH)CHz
-0-PO, MY' CHt -CHCoNHCCCHs )z CHl-〇-PO! MYFCHHz = CHCHz <TO0 (CHl cHt
o) nPO,MX' CHt -CHCHz O(CH,CHl 0)mPO
,MX! In the above, M is an alkali metal, R is a carbon atom number of 1 to 2
0 alkyl groups, Yl is H, M or cog =CHC
Hx OCH, CH(OH)CH, -Y2 is H, M or CH, =CHCONHCCCH3)! CHI-Xl
is CHz = CHCHt% O (CH! CH20)
n-OH or OM, Xl is CHl = CHCH* OCCHt CHz O)m-
OH or OM. Also, n is 1 to 100, m is 1 to 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上ツマ−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、メタクリル酸エステル、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 polymers 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 monomers. Examples include acid ester, methacrylic ester, ethylene, propylene, isobutyne, butadiene, isoprene, vinyl ether, aryl ether, aryl ester, acrylamide, methacrylamide, maleic acid, and maleic ester.
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。いずれの方法においても
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 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.
上記結合剤中の前記酸性基の塩含有モノマー量は０．０
１〜３０モル％であるのが好ましい。該塩含有上ツマー
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 monomer containing the salt of the acidic group in the binder is 0.0
It is preferably 1 to 30 mol%. If the amount of the salt-containing salt is too large, the solubility in solvents is poor and gelation is likely to 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
酸基を含有していてもよい。The vinyl chloride copolymer described above may further contain an epoxy group or a hydroxyl group.
ところで、従来の塩ビ系共重合体（例えばＵ。By the way, conventional vinyl chloride copolymers (for example, U.
Ｃ１Ｃ，社製のＶＡＧＨ）は以下の共重合成分からなっ
ていた。C1C (manufactured by VAGH) consisted of the following copolymerized components.
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、
ＣＨＩ 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 CHI Co instead of CHI Co. For example, a copolymer having the following units may be mentioned.
−ｆＣＨ，−ＣＨ−）−７、−＋Ｘ ＋−ＴＨ
（Ｘ：スルホ基又はホスホ基のアルカリ金属塩を含んだ
モノマーユニット部分）
磁性層においてポリウレタンを、塩化ビニル系樹脂、エ
ポキシ樹脂（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
。）と併用してもよく、なかでも、ポリウレタンと塩化
ビニル系樹脂との併用が好ましい、この場合、上記ウレ
タン樹脂と他の樹脂との配合比としては、他の樹脂が９
０〜１０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重量部を超えると塗
膜が脆く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。また上記配合・比が１０重
量部未満であると、磁性粉の粉落ちが起こり易くなる。-fCH, -CH-) -7, -+X +-TH (X: monomer unit portion containing an alkali metal salt of a sulfo group or a phosphor group) In the magnetic layer, polyurethane is used as a vinyl chloride resin, an epoxy resin (especially a phenoxy resin), polyester resin, or nitrocellulose resin (hereinafter referred to as other resins). Among these, combination use of polyurethane and vinyl chloride resin is preferred. In this case, the above urethane resin and other resins may be used together. The blending ratio with the other resin is 9
It is desirable that the amount is 0 to 10 parts by weight, more preferably 80 to 20 parts by weight. If the above-mentioned blending ratio exceeds 90 parts by weight, the coating film becomes too brittle and the durability of the coating film is significantly deteriorated, and the adhesion to the support also deteriorates. Furthermore, if the above 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
ソシアネート、コロネートしく日本ポリウレタン工業■
製）、デスモジュールしくバイエル社製）等の３官能イ
ソシアネート、または両末端にイソシアネート基を含有
するウレタンプレポリマーなと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、そのポリイソシ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 isocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and hexane diisocyanate, as well as coronate and Nippon Polyurethane Industries.
trifunctional isocyanates (manufactured by DesModular, manufactured by Bayer AG), or urethane prepolymers containing isocyanate groups at both ends, which are conventionally used as curing agents, and can also be used as curing agents. Any polyisocyanate can be used. The polyisocyanate curing agent is used in an amount of 5 to 80 parts by weight based on the total amount of binder.
非磁性支持体に最も近い層（第１図の例では第一の層２
）においては、磁性塗料中にポリイソシアネート系硬化
剤を入れないようにすることもできる。この場合には、
非磁性支持体に対する各層の接着性がより向上する。The layer closest to the non-magnetic support (first layer 2 in the example in Figure 1)
), it is also possible not to include a polyisocyanate curing agent in the magnetic coating. In this case,
The adhesion of each layer to the non-magnetic support is further improved.
非磁性支持体上に設けられた各層には、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。これにより、両者の各特長を発揮させながら、
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＜、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
も低下し易く、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＜、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、また多くなるとエステルがしみ出したり、出力低下
が生じ易くなる。Each layer provided on the non-magnetic support contains lubricants such as
It can contain fatty acids and/or fatty acid esters. As a result, while demonstrating each feature of both,
It can offset defects that occur when used alone, improve the lubrication effect, and improve 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 per 100 parts by weight of the magnetic powder.
5 to 8.0 parts by weight is even better.If the fatty acid content is outside this range, the dispersibility of the magnetic powder will decrease, and the runnability of the medium will tend to decrease, and if it increases, the fatty acid may seep out.
Output decrease is likely to occur. The amount of fatty acid ester added is preferably 0.1 to 10 parts by weight, and even better 0.2 to 8.5 parts by weight, based on 100 parts by weight of the magnetic powder. The effect of improving running performance is poor, and if the amount is too large, esters tend to seep out and output decreases.
また、上記の効果をより良好に奏するうえで、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、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。In addition, in order to better achieve the above effects, the weight ratio of fatty acids and fatty acid esters should be adjusted to -
A ratio of 10/90 to 90/10 is preferable. Fatty acids also have a dispersing effect, and the use of fatty acids reduces the amount of other low-molecular-weight dispersants used, increasing the Young's modulus of the magnetic recording medium by that amount. It is thought that it can be improved.
脂肪酸は一塩基性であっても二塩基性であってもよい、
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 may be monobasic or dibasic,
Fatty acids having 6 to 30 carbon atoms, more preferably 12 to 22 carbon atoms, are exemplified 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）コハク酸
（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) Succinic acid (16) Maleic acid (17) Glutaric acid (18) Adipic acid (19) Pimelic acid (20) Azelain Acid (21) Sebacic acid (22) 1.12-Dodecanedicarboxylic acid (23)
Octane dicarboxylic acid Examples of the above fatty acid esters are as follows.
（１）オレイルオレート
（２）オレイルステアレート
（３）イソセチルステアレート
（４）ジオレイルマレエート
（５）ブチルステアレート
ブチルパルミテート
ブチルミリステート
オクチルミリステート
オクチルパルミテート
アミルステアレート
アミルパルミテート
イソブチルオレエート
ステアリルステアレート
ラウリルオレート
オクチルオレート
イソブチルオレート
エチルオレート
イソトリデシルオレート
２−エチルへキシルステアレート
２−エチルヘキシルミリステート
エチルスデ７レート
２−エチルへキシルパルミテート
イソプロビルパルミテート
イソプロピルミリステート
ブチルラウレート
（２６）セチル−２−エチルへキサレート（２７）ジオ
レイルアジペート
（２８）ジエチルアジペート
（２９）ジイソブチルアジペート
（３０）ジイソデシルアジペート
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）等を磁性層等
に添加してよい。(1) Oleyl oleate (2) Oleyl stearate (3) Isocetyl stearate (4) Dioleyl maleate (5) Butyl stearate Butyl palmitate Butyl myristate Octyl myristate Octyl palmitate Amyl stearate Amyl palmitate Isobutyl Oleate Stearyl stearate Lauryl oleate Octyl oleate Isobutyl oleate Ethyl oleate Isotridecyl oleate 2-Ethylhexyl stearate 2-Ethylhexyl myristate Ethyl 7-late 2-Ethylhexyl palmitate Isopropyl palmitate Isopropyl myristate Butyl lau rate (26) cetyl-2-ethyl hexalate (27) dioleyl adipate (28) diethyl adipate (29) diisobutyl adipate (30) diisodecyl adipate In addition to the fatty acids and fatty acid esters mentioned above, other lubricants (e.g. (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、非磁性研磨剤粒子も磁性層に添加可能である。こ
れには、例えば、α−アルミナ、酸化クロム、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
グネシウム、窒化ホウ素等が使用される。この研磨材の
平均粒子径は０．６μｍ以下がよい、また、モース硬度
は５以上であるのが好ましい。Non-magnetic abrasive particles can also be added to the magnetic layer. For example, α-alumina, chromium oxide, titanium oxide, α-iron oxide, silicon oxide, silicon nitride, silicon carbide, zirconium oxide, zinc oxide, cerium oxide, magnesium oxide, boron nitride, etc. are used. The average particle diameter of this abrasive is preferably 0.6 μm or less, and the Mohs hardness is preferably 5 or more.
また、磁性層等には更に、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。Furthermore, an antistatic agent such as graphite, a dispersant such as powdered lecithin, or a phosphate ester may be added to the magnetic layer.
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〜１０００ｍμ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、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−Ｆ ｅ ｚ ０３ 、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。Non-magnetic particles include silicon oxide, titanium oxide, aluminum oxide, chromium oxide, silicon carbide, calcium carbide,
Examples include zinc oxide, α-F ez 03 , talc, kaolin, 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 in combination with the above-mentioned non-magnetic particles, as this further stabilizes the running properties of the medium, and in combination with the effect of the above-mentioned non-magnetic particles, it is possible to further improve the durability of the medium. be.
本発明においては、上述の複数の層は、ｎｅｔ ｏｎｗ
ｅｔで塗布するのが好ましく、同時重層塗布が好ましい
。In the present invention, the plurality of layers described above are net onw
Et coating is preferred, and simultaneous multilayer coating is preferred.
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、操作順序等は、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」はすべて重量部である。The components, proportions, order of operations, 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" are parts by weight.
〈ビデオテープの調製〉 まず、下記の各磁性塗料又は導電層用塗料を調製した。<Preparation of videotape> First, the following magnetic paints or conductive layer paints were prepared.
（最上層用磁性塗料Ａ）
Ｇｏ−１−Ｆｅ、 Ｏｓ １００部
（Ｈｃ−７０００ｅ ％ＢＥＴ ４５ｒｄ／ｇ。(Magnetic paint for top layer A) Go-1-Fe, Os 100 parts (Hc-7000e %BET 45rd/g.
平均粒径 ０．２μｍ）
スルホン酸カリウム含有塩化ビニル系樹脂１０部
ポリエステルポリウレタン
（ニスタン５７０１ ）
α−アルミナ（平均粒径０．２μｍ）
５部
５部
（以下次頁に続く）
カーボンブラック（平均−成粒径５０ｍμ）１部ミリス
チン酸 １部ステアリン酸
１部ブチルステアレート
１部メチルエチルケトン
１００部シクロヘキサノン
１００部トルエン
１００部上記組成の磁性塗料を混練、分散した後、
日本ポリウレタン工業社コロネー）Ｌ５部を添加し、調
製した。(average particle size 0.2 μm) 10 parts vinyl chloride resin containing potassium sulfonate Polyester polyurethane (Nistan 5701) α-alumina (average particle size 0.2 μm) 5 parts 5 parts (continued on next page) Carbon black (average - Particle size: 50 mμ) 1 part myristic acid 1 part stearic acid
1 part butyl stearate
1 part methyl ethyl ketone
100 parts cyclohexanone
100 parts toluene
After kneading and dispersing 100 parts of the magnetic paint having the above composition,
5 parts of Nippon Polyurethane Kogyo Co., Ltd. Coronet) L were added to prepare the solution.
スルホン酸カリウム含有塩化ビニル系樹脂ｒＭＲ−１１
０Ｊ （日本ゼオン社製）（最上層用磁性塗料Ａ（１
）、Ａ（２）、Ａ（３）、Ａ（４）、Ａ （５） ＞Ａ
（１）：上記塗料Ａにおいて、カーボンブラックの含有
量を０．５部とした。他はＡと同じである。Potassium sulfonate-containing vinyl chloride resin rMR-11
0J (manufactured by Nippon Zeon Co., Ltd.) (magnetic paint A for top layer (1
), A(2), A(3), A(4), A(5) >A
(1): In the above paint A, the carbon black content was 0.5 parts. Others are the same as A.
Ａ（２）：上記塗料Ａにおいて、カーボンブラックの含
有量のみを０．３部に変えた。A(2): In the above paint A, only the content of carbon black was changed to 0.3 parts.
Ａ（３）：上記塗料Ａにおいて、カーボンブラックのみ
を除いた。A(3): In the above paint A, only carbon black was removed.
Ａ（４）：上記塗料Ａにおいて、カー゛ボンブラックの
含有量のみを０．１部に変えた。A(4): In the above paint A, only the carbon black content was changed to 0.1 part.
Ａ（５）：上記塗料Ａにおいて、カーボンブラックの含
有量を０．２部とした。A(5): In the above paint A, the carbon black content was 0.2 parts.
〈導電下層用磁性塗料Ｂ〉
Ｃｏ Ｉ Ｆｅｚｅｓ １００
部Ｈｃ＝６５００ｅ ＢＥＴ ３０ｒｒｆ／ｇ平
均粒径 ０．３μｍ
スルホン酸カリウム含有塩化ビニル系樹脂（上記と同じ
） １０部ポリエステルポ
リウレタン ５部（ニスタン５７０１）
導電性カーボンブラック ５部ミリス
チン酸 １部ステアリン酸
１部ブチルステアレート
１部メチルエチルケトン
８０部シクロヘキサノン
８０部トルエン ８
０部上記磁性塗料を混線、分散した。<Magnetic paint B for conductive lower layer> Co I Fezes 100
Part Hc=6500e BET 30rrf/g Average particle size 0.3μm Potassium sulfonate-containing vinyl chloride resin (same as above) 10 parts Polyester polyurethane 5 parts (Nistan 5701) Conductive carbon black 5 parts Myristic acid 1 part Stearic acid
1 part butyl stearate
1 part methyl ethyl ketone
80 parts cyclohexanone
80 parts toluene 8
0 parts The above magnetic paint was cross-wired and dispersed.
〈導電下層用磁性塗料Ｂ （１） ＞
上記塗料Ｂにおいて、カーボンブラックの含有量のみを
１部に変えた。<Magnetic Paint B for Conductive Lower Layer (1)> In the above paint B, only the content of carbon black was changed to 1 part.
〈導電下層用磁性塗料Ｂ （２） ＞
上記塗料Ｂにおいて、カーボンブラックの含有量のみを
０．５部に変えた。<Magnetic Paint B for Conductive Lower Layer (2)> In the above paint B, only the content of carbon black was changed to 0.5 part.
〈導電下層用磁性塗料Ｃ〉
Ｃｒｏｗ ｔｏｏ部Ｈ
ｃ＝ ７０００ｅ ＢＥＴ ３０ｒｄ／ｇスルホ
ン酸カリウム含有塩化ビニル系樹脂（上記と同じ）１０
部
ポリエステルポリウレタン ５部ミリス
チン酸 １部ステアリン酸
１部ブチルステアレート
１部メチルエチルケトン
８０部シクロヘキサノン
８０部トルエン
８０部上記組成の磁性塗料を混練、分散した。<Magnetic paint C for conductive lower layer> Crow too part H
c= 7000e BET 30rd/g potassium sulfonate-containing vinyl chloride resin (same as above) 10
1 part polyester polyurethane 5 parts myristic acid 1 part stearic acid
1 part butyl stearate
1 part methyl ethyl ketone
80 parts cyclohexanone
80 parts toluene
80 parts of the magnetic paint having the above composition were kneaded and dispersed.
（導電下層用塗料Ｄ〉
Ｓｎｏｗ（平均粒径０．７μｍ ） １０部
スルホン酸ナトリウム含有ポリエステル １部部「バイ
ロン５３０Ｊ （東洋紡社製）メチルエチルケトン
１００部トルエン
１００部上記組成の塗料を混練、分散し
た。(Coating D for conductive lower layer) Snow (average particle size 0.7 μm) 10 parts Sodium sulfonate-containing polyester 1 part "Vylon 530J (manufactured by Toyobo Co., Ltd.) Methyl ethyl ketone
100 parts toluene
100 parts of a paint having the above composition were kneaded and dispersed.
〈導電下層用塗料Ｅ）
カーボンブラック １部部スルホ
ン酸ナトリウム含有ポリエステル １０部「バイロン５
３０Ｊ （東洋紡社製）メチルエチルケトン
１００部トルエン
１００部上記組成の塗料を混練、分散した。<Conductive lower layer coating E) Carbon black 1 part Sodium sulfonate-containing polyester 10 parts "Vylon 5"
30J (manufactured by Toyobo) Methyl ethyl ketone
100 parts toluene
100 parts of a paint having the above composition were kneaded and dispersed.
次に、厚さ１４．５μ鴎のポリエチレンテレフタレート
ベースフィルム上に、導電性下層用塗料Ｂ、Ｂ（１）、
Ｂ（２）、Ｃ，Ｄ又はＥ＠塗布すると共に、最上層用磁
性塗料ＡスＡ （１）、Ａ（２）、Ａ（３）、Ａ（４）
、又はＡ（５）が導電性下層用塗料の上になるように重
層塗布し、配向、乾燥後、カレンダー処理を行い、下記
表に示す各塗料の組合せからなる導電性下層、最上層を
形成した。Next, conductive lower layer coatings B, B(1),
Apply B(2), C, D or E@, and apply magnetic paint A for the top layer A(1), A(2), A(3), A(4)
, or A (5) is applied in multiple layers so that it is on top of the conductive lower layer paint, and after orientation and drying, calender treatment is performed to form a conductive lower layer and top layer consisting of the combination of each paint shown in the table below. did.
しかる後、次の組成のＢＣ層用塗料を磁性層等の反対側
の面に乾燥厚さ０．４μｌ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 surface opposite to the magnetic layer to a dry thickness of 0.4 μl.
カーボンブラック（Ｒａ ｖ ｅ ｎ１０３５）
４０部硫酸バリウム （平均粒径３００ｍμ ）１
０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
シクロへキサノン ４００部メ
チルエチルケトン ２５０部斗ルエ
ン ２５０部このように
して幅広の磁性フィルムを得、これを巻き取った。この
フィルムを４インチ幅に断裁し、表に示す各ビデオテー
プとした。ただし、上層（第１図においては第二の層４
）の乾燥膜厚は１．０μｍとし、導電性下層（第１図に
おいては第一の層２）の乾燥膜厚は２．０μｍとした。Carbon black (Rave n1035)
40 parts barium sulfate (average particle size 300 mμ) 1
0 parts Nitrocellulose 25 parts N-2301 (manufactured by Nippon Polyurethane) 25 parts Coronate L () 10 parts Cyclohexanone 400 parts Methyl ethyl ketone 250 parts Toluene 250 parts A wide magnetic film was thus obtained and wound up. . This film was cut into 4-inch widths to produce the video tapes shown in the table. However, the upper layer (second layer 4 in Figure 1)
) had a dry film thickness of 1.0 μm, and the conductive lower layer (first layer 2 in FIG. 1) had a dry film thickness of 2.0 μm.
使用する最上層用磁性塗料、導電性下層用塗料の組合せ
を下記表に示すように変え、各実施例、比較例のビデオ
テープを調製した。ただし、表中、「実−」は実施例を
、「比−」は比較例を示す。Video tapes of Examples and Comparative Examples were prepared by changing the combinations of the magnetic paint for the uppermost layer and the paint for the conductive lower layer as shown in the table below. However, in the table, "actual" indicates an example, and "ratio" indicates a comparative example.
これら各ビデオテープについて、下記の測定を行い、結
果を下記表に示した。測定方法は以下の通りである。The following measurements were performed on each of these videotapes, and the results are shown in the table below. The measurement method is as follows.
表面比抵抗：表面電位計にて測定した。Surface specific resistance: Measured with a surface electrometer.
動摩擦係数：２５°Ｃにてテープ走行性試験機Ｔ巳Ｔ３
００ Ｄ （横浜システム研究所）にてクロムメツキス
テンレス４φピン
にテープを１８０６巻きつけ、テープ
スピード３．３３ｃｍ／ｓｅｃ 、入口テンション２０
ｇで測定し、次式にてμにを
算出した。Dynamic friction coefficient: At 25°C, tape runnability tester Tumi T3
At 00 D (Yokohama System Research Institute), 1806 pieces of tape were wrapped around a chrome plated stainless steel 4φ pin, tape speed 3.33cm/sec, entrance tension 20
g, and μ was calculated using the following formula.
ＲＦ出カニＲＦ測定用のＶＴＲデツキとしてＨＲ−３６
０００を用い、１００％ホワイト信号のＲＦ出力を測定
した。HR-36 as a VTR deck for RF measurement
000 was used to measure the RF output of a 100% white signal.
ルミＳ ／ Ｎ ： ５ｈｉｂａｓｏｋｕ ９２５ Ｄ
／ １により測定した。Lumi S/N: 5hibasoku 925 D
/1.
ドロップアウト：日本ビクター社製ドロ・ノブアウトカ
ウンターＶＤ−５Ｍを使用
し、１５ 、ｌ／ ｓｅｃ以上長く、かツＲＦエンベロ
ープの出力の２０ｄＢ以
上下がった出力をドロップアラ
ト１個として、全長測定し、１
分間あたりの平均値を求めた。Dropout: Using a Dro Knob Out Counter VD-5M manufactured by Victor Japan, measure the total length of a dropout that is longer than 15 l/sec and whose output is 20dB or more lower than the output of the RF envelope as one dropout. The average value per minute was calculated.
走行不良：４０°Ｃ５８０％ＲＨ中で１００回繰り返し
走行させ、走行不良の有無を調べた。Running defects: The vehicle was repeatedly run 100 times at 40° C. and 580% RH, and the presence or absence of running defects was examined.
ここで、エツジ折れ（大）とは、走 行したテープ全長に亘ってエツジ折れ が発生しているものをいい、エツジ折 れ（小）とは、走行したテープの一部 分、特にテープ始端付近とテープ終端 付近とにエツジ折れが発生しているも のをいう。Here, edge bending (large) means The edges are bent over the entire length of the tape. This refers to the occurrence of Re (small) is the part of the tape that ran. minutes, especially near the beginning of the tape and at the end of the tape. There are some edge breaks in the vicinity. Say something.
（以下余白）
表に示すように、実施例のビデオテープは、比較例のビ
デオテープにくらべ、電磁変換特性が良好で、ドロップ
アウトが少なく、走行性に優れている。(The following is a margin.) As shown in the table, the video tapes of the examples have better electromagnetic conversion characteristics, fewer dropouts, and better running properties than the video tapes of the comparative examples.
次に、実施例１のビデオテープにおいて、導電下層磁性
塗料中のカーボンブラックの量を増減させることによっ
て、テープの表面比抵抗を種々変化させ、この変化に対
応するドロップアウト数の変化を第２図に示した。Next, in the videotape of Example 1, the surface resistivity of the tape was variously changed by increasing or decreasing the amount of carbon black in the conductive lower layer magnetic paint, and the corresponding change in the number of dropouts was Shown in the figure.
第２図の結果から、本発明に基づく限定値が重要である
と解る。From the results shown in FIG. 2, it can be seen that the limiting values based on the present invention are important.
第１図は本発明の磁気記録媒体の一例を示す部分断面図
である。
第２図はビデオテープの表面比抵抗とドロップアウトと
の関係を示すグラフである。
なお、図面に示す符号において、
１・・・・・・・・・非磁性支持体
２・・・・・・・・・第一の層（導電性下層）３・・・
・・・・・・バックコート層
４・・・・・・・・・第二の層
である。FIG. 1 is a partial cross-sectional view showing an example of the magnetic recording medium of the present invention. FIG. 2 is a graph showing the relationship between videotape surface resistivity and dropout. In addition, in the symbols shown in the drawings, 1...Nonmagnetic support 2...First layer (conductive lower layer) 3...
. . . Back coat layer 4 . . . Second layer.
Claims (1)
体において、動摩擦係数が０．２５以下でありかつ表面
比抵抗が１．０×１０＾９Ω／ｓｑ以下であることを特
徴とする磁気記録媒体。1. A magnetic recording medium comprising a plurality of layers on a non-magnetic support, characterized in that the coefficient of dynamic friction is 0.25 or less and the surface resistivity is 1.0 x 10^9 Ω/sq or less. magnetic recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32186089A JPH02257425A (en) | 1988-12-12 | 1989-12-12 | Magnetic recording medium |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31448988 | 1988-12-12 | ||
| JP63-314489 | 1988-12-12 | ||
| JP32186089A JPH02257425A (en) | 1988-12-12 | 1989-12-12 | Magnetic recording medium |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6294998A Division JPH10308018A (en) | 1998-03-13 | 1998-03-13 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02257425A true JPH02257425A (en) | 1990-10-18 |
Family
ID=26567964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32186089A Pending JPH02257425A (en) | 1988-12-12 | 1989-12-12 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02257425A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04301215A (en) * | 1991-03-28 | 1992-10-23 | Teijin Memory Media Kk | Flexible magnetic disk |
| JPH05274652A (en) * | 1992-03-27 | 1993-10-22 | Fuji Photo Film Co Ltd | Magnetic recording medium and magnetic tape cassette packed with the same |
| WO2003065373A1 (en) * | 2002-01-28 | 2003-08-07 | Sony Corporation | Magnetic tape cartridge and recorder/reproducer of magnetic tape cartridge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58205928A (en) * | 1982-05-25 | 1983-12-01 | Toshiba Corp | Magnetic recording medium |
| JPS6334726A (en) * | 1986-07-28 | 1988-02-15 | Tdk Corp | Magnetic recording medium |
| JPS63261524A (en) * | 1987-04-20 | 1988-10-28 | Konica Corp | Magnetic recording medium |
-
1989
- 1989-12-12 JP JP32186089A patent/JPH02257425A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58205928A (en) * | 1982-05-25 | 1983-12-01 | Toshiba Corp | Magnetic recording medium |
| JPS6334726A (en) * | 1986-07-28 | 1988-02-15 | Tdk Corp | Magnetic recording medium |
| JPS63261524A (en) * | 1987-04-20 | 1988-10-28 | Konica Corp | Magnetic recording medium |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04301215A (en) * | 1991-03-28 | 1992-10-23 | Teijin Memory Media Kk | Flexible magnetic disk |
| JPH05274652A (en) * | 1992-03-27 | 1993-10-22 | Fuji Photo Film Co Ltd | Magnetic recording medium and magnetic tape cassette packed with the same |
| WO2003065373A1 (en) * | 2002-01-28 | 2003-08-07 | Sony Corporation | Magnetic tape cartridge and recorder/reproducer of magnetic tape cartridge |
| CN1329914C (en) * | 2002-01-28 | 2007-08-01 | 索尼株式会社 | Magnetic tape cartridge and recorder/reproducer a magnetic tape cartridge |
| US7295402B2 (en) | 2002-01-28 | 2007-11-13 | Sony Corporation | Magnetic tape cartridge and recorder/reproducer a magnetic tape cartridge |
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