JPH04319522A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04319522A JPH04319522A JP8886091A JP8886091A JPH04319522A JP H04319522 A JPH04319522 A JP H04319522A JP 8886091 A JP8886091 A JP 8886091A JP 8886091 A JP8886091 A JP 8886091A JP H04319522 A JPH04319522 A JP H04319522A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- recording medium
- magnetic recording
- hydrocarbon group
- 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 108
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 125000001183 hydrocarbyl group Chemical group 0.000 claims abstract 4
- 150000001875 compounds Chemical class 0.000 claims description 31
- 239000000843 powder Substances 0.000 claims description 31
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 30
- 230000005294 ferromagnetic effect Effects 0.000 claims description 27
- 239000011230 binding agent Substances 0.000 claims description 24
- 125000004432 carbon atom Chemical group C* 0.000 claims description 9
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 50
- -1 fatty acid ester Chemical class 0.000 description 32
- 235000014113 dietary fatty acids Nutrition 0.000 description 29
- 239000000194 fatty acid Substances 0.000 description 29
- 229930195729 fatty acid Natural products 0.000 description 29
- 239000000314 lubricant Substances 0.000 description 23
- 150000004665 fatty acids Chemical class 0.000 description 22
- 229920005989 resin Polymers 0.000 description 21
- 239000011347 resin Substances 0.000 description 21
- 230000000694 effects Effects 0.000 description 12
- 238000003860 storage Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 239000003973 paint Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000006229 carbon black Substances 0.000 description 8
- 239000010954 inorganic particle Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 150000002430 hydrocarbons Chemical group 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 229910019142 PO4 Inorganic materials 0.000 description 6
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 239000003431 cross linking reagent Substances 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- 239000012948 isocyanate Substances 0.000 description 6
- 150000002513 isocyanates Chemical class 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 235000021317 phosphate Nutrition 0.000 description 6
- 125000000217 alkyl group Chemical group 0.000 description 5
- 239000002216 antistatic agent Substances 0.000 description 5
- 150000002148 esters Chemical group 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- 238000006460 hydrolysis reaction Methods 0.000 description 5
- 238000004898 kneading Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000005056 polyisocyanate Substances 0.000 description 5
- 229920001228 polyisocyanate Polymers 0.000 description 5
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004640 Melamine resin Substances 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical class CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 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
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 150000003973 alkyl amines Chemical class 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 239000010775 animal oil Substances 0.000 description 2
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000002480 mineral oil Substances 0.000 description 2
- 235000010446 mineral oil Nutrition 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920001220 nitrocellulos Polymers 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 150000003014 phosphoric acid esters Chemical class 0.000 description 2
- 229920006122 polyamide resin Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 235000003441 saturated fatty acids Nutrition 0.000 description 2
- 150000004671 saturated fatty acids Chemical class 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 2
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-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
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- 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 1
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-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
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-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
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 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
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 229920008347 Cellulose acetate propionate Polymers 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000251730 Chondrichthyes Species 0.000 description 1
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- CTKINSOISVBQLD-UHFFFAOYSA-N Glycidol Chemical compound OCC1CO1 CTKINSOISVBQLD-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- 239000005058 Isophorone diisocyanate Substances 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- JCELWOGDGMAGGN-UHFFFAOYSA-N N=C=O.N=C=O.C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 Chemical compound N=C=O.N=C=O.C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 JCELWOGDGMAGGN-UHFFFAOYSA-N 0.000 description 1
- JMHQPTAFBUVYBA-UHFFFAOYSA-N N=C=O.N=C=O.CC1=CC=CC=C1N Chemical compound N=C=O.N=C=O.CC1=CC=CC=C1N JMHQPTAFBUVYBA-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- QVYYOKWPCQYKEY-UHFFFAOYSA-N [Fe].[Co] Chemical compound [Fe].[Co] QVYYOKWPCQYKEY-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011354 acetal resin Substances 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 150000001408 amides Chemical group 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 150000003863 ammonium salts Chemical group 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 description 1
- 125000003710 aryl alkyl group Chemical group 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical group 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229940090961 chromium dioxide Drugs 0.000 description 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 1
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- XBCSKPOWJATIFC-UHFFFAOYSA-N cobalt iron nickel Chemical compound [Fe][Ni][Fe][Co] XBCSKPOWJATIFC-UHFFFAOYSA-N 0.000 description 1
- NVIVJPRCKQTWLY-UHFFFAOYSA-N cobalt nickel Chemical compound [Co][Ni][Co] NVIVJPRCKQTWLY-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 125000004356 hydroxy functional group Chemical group O* 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 125000005496 phosphonium group Chemical group 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 150000003016 phosphoric acids Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- UHZYTMXLRWXGPK-UHFFFAOYSA-N phosphorus pentachloride Chemical compound ClP(Cl)(Cl)(Cl)Cl UHZYTMXLRWXGPK-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 1
- 229920005670 poly(ethylene-vinyl chloride) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical class NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium group Chemical group [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229920006163 vinyl copolymer Polymers 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 239000010698 whale oil Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は非磁性支持体上に磁性層
を設けた磁気記録媒体に関し、特に広範囲の温度および
湿度条件において走行性、耐久性および保存安定性に優
れる磁気記録媒体に関するものである。[Field of Industrial Application] The present invention relates to a magnetic recording medium having a magnetic layer provided on a non-magnetic support, and particularly to a magnetic recording medium that has excellent runnability, durability, and storage stability under a wide range of temperature and humidity conditions. It is.
【０００２】0002
【従来の技術】磁気記録媒体においては、より高密度記
録の要求が高まり、その対応手段の一つとして磁性層の
表面を平滑にすることが行われている。2. Description of the Related Art In magnetic recording media, there has been an increasing demand for higher density recording, and one way to meet this demand is to make the surface of the magnetic layer smooth.
【０００３】しかしながら、電磁変換特性向上のため磁
性層の表面を平滑にすると磁気記録媒体の走行中におい
て磁性層と装置系との接触における摩擦係数が増大する
結果、短期間の使用で磁気記録媒体の磁性層が損傷を受
け、あるいは磁性層が剥離する傾向がある。However, when the surface of the magnetic layer is smoothed to improve electromagnetic conversion characteristics, the friction coefficient of the contact between the magnetic layer and the device system increases while the magnetic recording medium is running. There is a tendency for the magnetic layer to be damaged or for the magnetic layer to peel off.
【０００４】このような問題に対処するために磁性層の
塗布液中に潤滑剤を添加する方法、あるいは磁性層表面
に潤滑剤を塗布する方法が知られている。[0004] In order to deal with such problems, methods are known in which a lubricant is added to the coating liquid for the magnetic layer, or a method in which the lubricant is applied to the surface of the magnetic layer.
【０００５】潤滑剤としては従来、鉱物油、シリコンオ
イル、高級アルコール、高級脂肪酸、脂肪酸エステル、
牛脂、鯨油、鮫油等の動物油あるいは植物油などが用い
られてきた。Conventionally, lubricants include mineral oil, silicone oil, higher alcohol, higher fatty acid, fatty acid ester,
Animal oils such as beef tallow, whale oil, and shark oil, or vegetable oils have been used.
【０００６】上記の如く従来の潤滑剤は、潤滑剤が少な
い場合には潤滑効果が弱く、潤滑効果を高めるため多く
添加すると、磁性塗膜の機械的強度は弱くなり磁性層が
削れ、削れ粉が走行経路を汚したり、あるいは十分なス
チル再生の耐久性が得られなかったりした。スチル再生
の耐久性を向上させるためには特公昭５１−３９０８１
号公報等に開示されているように、ステアリン酸ブチル
の如き脂肪酸エステルとミリスチン酸の如き脂肪酸を混
合して用いることが知られている。As mentioned above, conventional lubricants have a weak lubricating effect when there is a small amount of lubricant, and when a large amount is added to increase the lubricating effect, the mechanical strength of the magnetic coating becomes weak, the magnetic layer is scraped, and abrasions occur. The vehicle contaminated the driving route, or the durability of still playback was not sufficient. In order to improve the durability of still playback,
As disclosed in Japanese Patent Application Publication No. 2003-110029, it is known to use a mixture of a fatty acid ester such as butyl stearate and a fatty acid such as myristic acid.
【０００７】しかしながらこれらの開示例を用いると高
湿状態で走行させたとき摩擦が大きくなり磁気テープの
走行テンションが大きくなるという問題が生じる。また
、脂肪酸は単独で使用した場合は、画質の向上には有効
であるが、潤滑性を得るためには、多量に用いる必要が
あり、そのため可塑化作用によって磁性層が柔らかくな
り、機械的強度が低下し、スチル再生の耐久性が劣化す
る欠点があった。However, when these disclosed examples are used, a problem arises in that when running in a high humidity condition, friction increases and the running tension of the magnetic tape increases. Furthermore, when fatty acids are used alone, they are effective in improving image quality, but in order to obtain lubricity, it is necessary to use large amounts, which softens the magnetic layer due to its plasticizing effect and reduces its mechanical strength. There was a drawback that the durability of still playback deteriorated.
【０００８】また特公昭５１−３９０８１号公報に記載
されている脂肪酸と脂肪酸エステル化合物の併用は、ス
チル耐久性が良好となり、かつ走行テンションも比較的
小さくなるが、相対湿度８５％というような高湿条件に
おいては走行テンションが大きくなる欠点を有していた
。Furthermore, the combined use of a fatty acid and a fatty acid ester compound described in Japanese Patent Publication No. 51-39081 provides good still durability and relatively low running tension, but at high relative humidity such as 85%. It has the disadvantage that running tension increases under humid conditions.
【０００９】これらの欠点を解消するために特開昭５８
−８０８２８号公報では磁性層中に飽和または不飽和脂
肪酸と脂肪族ヒドロカルビルリン酸エステルを用いるこ
とを提案している。そして、これを用いる事により常温
時および高湿時の潤滑性に優れ、耐摩耗性およびスチル
再生の耐久性が良好であると記載されている。しかし高
温高湿保存あるいは酸性雰囲気での保存では加水分解を
起こし走行耐久性が劣化する。また特開平１−２４８３
１５号公報の提案では高級脂肪酸のアルキルアミドを用
いる事により常温時および高湿時の潤滑性に優れ、耐摩
耗性およびスチル再生の耐久性が良好であると記載され
ているが、低温保存により潤滑剤が析出し易く、目詰ま
りおよび走行耐久性が劣化する。[0009] In order to eliminate these drawbacks, Japanese Patent Application Laid-Open No. 1983
Publication No. 80828 proposes the use of saturated or unsaturated fatty acids and aliphatic hydrocarbyl phosphates in the magnetic layer. It is also stated that the use of this material provides excellent lubricity at room temperature and high humidity, and good abrasion resistance and durability for still regeneration. However, when stored at high temperature and high humidity or in an acidic atmosphere, hydrolysis occurs and running durability deteriorates. Also, JP-A-1-2483
The proposal in Publication No. 15 states that by using alkylamides of higher fatty acids, it has excellent lubricity at room temperature and high humidity, and has good wear resistance and durability for still regeneration. The lubricant tends to precipitate, resulting in clogging and poor running durability.
【００１０】特に最近、ＶＴＲや、パーソナルコンピュ
ーター、ワードプロセッサ用等の民生用のフロッピーデ
ィスクドライブ装置が普及し、磁気記録媒体の使用条件
も低温下での使用、あるいは高温高湿下での使用等広き
にわたるようになってきた。従って、磁気記録媒体は予
測される種々の、条件下においてもその走行耐久性が変
動することがないような安定したものでなければならな
いが従来知られているような潤滑剤では十分ではなく性
能が劣化するという問題があった。[0010] Particularly recently, consumer floppy disk drive devices for VTRs, personal computers, word processors, etc. have become widespread, and the conditions for using magnetic recording media have expanded, such as use at low temperatures or use at high temperatures and high humidity. It has started to spread. Therefore, magnetic recording media must be stable so that their running durability does not change even under various expected conditions, but conventionally known lubricants are not sufficient for performance. There was a problem of deterioration.
【００１１】塗布型の磁気記録媒体の場合には、走行耐
久性を向上されるための別の対策としては、磁性層に研
磨材（硬質粒子）を添加する方法が提案され、実施され
ているが、磁性層の走行耐久性を向上させる目的で磁性
層に研磨材を添加する場合には、研磨材を相当多量に添
加しなければその添加効果が現れにくい。ところが、大
量に添加した場合には磁気記録媒体としての電気的特性
及びヘッドの摩耗の面で好ましくなく、電磁変換特性お
よびヘッド摩耗性を犠牲にすることなく走行耐久性を得
ることは難しい問題であった。In the case of coating-type magnetic recording media, as another measure to improve running durability, a method of adding abrasives (hard particles) to the magnetic layer has been proposed and implemented. However, when an abrasive is added to the magnetic layer for the purpose of improving the running durability of the magnetic layer, the effect of the addition is difficult to be seen unless the abrasive is added in a considerably large amount. However, if it is added in large quantities, it is unfavorable in terms of the electrical properties of the magnetic recording medium and head wear, and it is difficult to obtain running durability without sacrificing electromagnetic conversion properties and head wear. there were.
【００１２】そこで本件出願人は、特に広範囲の温湿度
条件下において、電磁変換特性、ヘッド摩耗性を犠牲に
することなく、走行耐久性を安定して得られる磁気記録
媒体を提供することを目的として、先に磁性層に潤滑剤
として高級脂肪酸のＮ，Ｎ−ジアルキルアミド化合物を
用いることを提案した（特開平１−２４８３１５号公報
）。確かにこの提案により、従来高級脂肪酸エステルを
用いた場合に、エステルの部分で加水分解を受けやすい
ことに起因する高温高湿、低温低湿で下の条件下の走行
安定性が顕著に改良することができた。しかし近年更に
過酷な条件でも安定した走行安定性が要求されるととも
に、スチルモードにおける耐久性が要求されるようにな
った。すなわち高級脂肪酸エステルはスチル耐久性に極
めて優れるが、一方前述の如く加水分解を受けやすく安
定した走行安定性は得られなかった。前述のジアルキル
アミド化物は耐加水分解性には優れるものであるが、ス
チル耐久性においては充分なものではなかった。[0012] Therefore, the present applicant has aimed to provide a magnetic recording medium that can stably obtain running durability without sacrificing electromagnetic conversion characteristics and head abrasion properties, especially under a wide range of temperature and humidity conditions. As such, we previously proposed the use of N,N-dialkylamide compounds of higher fatty acids as lubricants in the magnetic layer (Japanese Patent Laid-Open No. 1-248315). It is true that this proposal significantly improves the running stability under conditions of high temperature and high humidity, low temperature and low humidity, which is caused by the ester part being susceptible to hydrolysis when conventional higher fatty acid esters are used. was completed. However, in recent years, there has been a demand for stable driving stability even under even harsher conditions, as well as durability in still mode. That is, higher fatty acid esters have extremely excellent still durability, but as mentioned above, they are susceptible to hydrolysis and cannot provide stable running stability. Although the aforementioned dialkylamidates have excellent hydrolysis resistance, they do not have sufficient still durability.
【００１３】[0013]
【発明が解決しようとする課題】本発明は、従来の潤滑
剤では到底達成できなかった優れた耐久性および環境適
応性を有する磁気記録媒体を提供することを目的とする
。SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording medium that has excellent durability and environmental adaptability that could never be achieved with conventional lubricants.
【００１４】特に本発明は、低温保存性のドロップアウ
ト、低温保存、高温高湿保存後のスチル耐久性において
優れた効果を発揮する磁気記録媒体を提供することを目
的とする。In particular, it is an object of the present invention to provide a magnetic recording medium that exhibits excellent effects in terms of dropout in low-temperature storage, and still durability after low-temperature storage and high-temperature, high-humidity storage.
【００１５】[0015]
【課題を解決するための手段】すなわち本発明の上記目
的は、非磁性支持体上に磁性層を設けた磁気記録媒体に
おいて、該磁性層表面及び／又は内部に一般式１で示さ
れるメチル分岐型脂肪族炭化水素基を含むＮ，Ｎ−ジア
ルキルアミド化合物より選ばれた少なくとも１種以上の
化合物を含むことを特徴とする磁気記録媒体によって達
成できる。[Means for Solving the Problems] That is, the above-mentioned object of the present invention is to provide a magnetic recording medium in which a magnetic layer is provided on a non-magnetic support, and to provide a methyl branch represented by the general formula 1 on the surface and/or inside of the magnetic layer. This can be achieved by a magnetic recording medium characterized by containing at least one compound selected from N,N-dialkylamide compounds containing type aliphatic hydrocarbon groups.
【００１６】[0016]
【化０３】[C03]
【００１７】ここで、Ｒ１ は一般式２に示される炭素
数１１以上２１以下のメチル分岐炭化水素基である。ま
た、Ｒ２ 、Ｒ３は炭素数１以上２２以下の炭化水素基
である。Here, R1 is a methyl branched hydrocarbon group represented by general formula 2 and having 11 to 21 carbon atoms. Further, R2 and R3 are hydrocarbon groups having 1 or more and 22 or less carbon atoms.
【００１８】[0018]
【化０４】[C04]
【００１９】ここで、ｍとｎは０以上の整数である。[0019] Here, m and n are integers greater than or equal to 0.
【００２０】また、本発明の上記目的は更に好ましくは
、前記磁性層は強磁性粉末と結合剤と前記一般式１で示
されるメチル分岐型脂肪族炭化水素基を含むＮ，Ｎ−ジ
アルキルアミド化合物より選ばれた少なくとも１種以上
の化合物を含み、前記結合剤が−ＳＯ３ Ｍ、−ＯＳＯ
３ Ｍ、−ＰＯ３Ｍ２ 、−ＯＰＯ３ Ｍ２ （ただし
Ｍは水素、アルカリ金属、アンモニウム基を示す）より
選ばれた少なくとも１種以上の極性基を含むことを特徴
とする磁気記録媒体のよって達成できる。[0020] Furthermore, the above object of the present invention is more preferably achieved by the magnetic layer comprising a ferromagnetic powder, a binder, and an N,N-dialkylamide compound containing a methyl branched aliphatic hydrocarbon group represented by the general formula 1. The binder contains at least one compound selected from -SO3M, -OSO
This can be achieved by a magnetic recording medium characterized by containing at least one polar group selected from 3M, -PO3M2, and -OPO3M2 (where M represents hydrogen, an alkali metal, or an ammonium group).
【００２１】すなわち、本発明は前記一般式２の如く分
岐するメチル基が炭化水素基の炭素鎖の中央、またはよ
りアミド基に近い位置の炭素に結合しているために配向
しにくく、結晶化を阻害する働きがあり、融点を低くす
ることができ、Ｎ，Ｎ−ジアルキルアミド化合物のアル
キル基の良好な耐加水分解性を持つと同時に低温下にお
いても良好な潤滑特性を発揮する。That is, in the present invention, since the branched methyl group as shown in the general formula 2 is bonded to the center of the carbon chain of the hydrocarbon group or to the carbon at a position closer to the amide group, it is difficult to orient, and crystallization is difficult. N,N-dialkylamide compounds have good hydrolysis resistance of the alkyl group, and at the same time exhibit good lubricating properties even at low temperatures.
【００２２】つまり、従来からあるＮ，Ｎ−ジアルキル
アミド化合物のアルキル基は、分岐のものもあるが、い
づれも前記Ｒ１ は末端分岐でありこのような構造では
直さの場合と同じように配向しやすく、結晶化しやすい
が、本発明はこのような点が解決できたものである。In other words, some of the alkyl groups of conventional N,N-dialkylamide compounds are branched, but in all of them, the above R1 is terminally branched, and in such a structure, it is not oriented in the same way as in the case of a straight one. However, the present invention solves these problems.
【００２３】すなわち、本発明は、磁性層表面又は内部
にメチル分岐型脂肪族炭化水素基を含むＮ，Ｎ−ジアル
キルアミド化合物より選ばれた少なくとも１種以上の化
合物を含むもので、融点が低いため表面に十分量が存在
しても低温経時により結晶化せず安定した走行耐久性を
得ることができ、また本発明の化合物を数種混合する事
によって融点降下により更に融点及び結晶性を抑制する
ことができ、テープ走行により表面に滲み出しにくく良
好な潤滑性能を長期間にわたって維持することが出来る
。本発明で用いる有機化合物について以下に詳細を述べ
る。That is, the present invention contains at least one compound selected from N,N-dialkylamide compounds containing a methyl branched aliphatic hydrocarbon group on the surface or inside of the magnetic layer, and has a low melting point. Therefore, even if a sufficient amount is present on the surface, it will not crystallize over time at low temperatures and stable running durability can be obtained.Additionally, by mixing several types of compounds of the present invention, the melting point and crystallinity can be further suppressed by lowering the melting point. This makes it possible to maintain good lubrication performance over a long period of time without easily seeping out onto the surface when the tape is running. The details of the organic compound used in the present invention will be described below.
【００２４】[0024]
【化０５】[C05]
【００２５】Ｒ１ は一般式２に示される炭素数１１以
上２１以下のメチル分岐炭化水素基である。R1 is a methyl branched hydrocarbon group represented by general formula 2 and having 11 to 21 carbon atoms.
【００２６】[0026]
【化０６】[C06]
【００２７】ただし、ｍ、ｎは、０以上の整数であり、
Ｒ２ 、Ｒ３ は炭素数１以上２２以下の炭化水素基で
ある。[0027] However, m and n are integers of 0 or more,
R2 and R3 are hydrocarbon groups having 1 or more and 22 or less carbon atoms.
【００２８】一般に脂肪酸のアミド化物は脂肪酸のエス
テル化物に比べて加水分解せず長期間の保存安定性に優
れているが、結合剤との溶解性が非常に低く潤滑性をも
たらす量を添加すると磁性層の物性を脆くする性質があ
った。そこで結合剤への溶解性を上げるために脂肪酸の
Ｎ，Ｎ−アルキルアミド化物が開発されたが、アミド化
物は一般に融点が高く、また結晶化し易いために表面に
存在するアミド化物の一部が低温保存などで結晶化し、
走行性あるいは目詰まりの原因となった。そこで末端か
ら４つ以上メチル分岐が離れた本発明のメチル分岐Ｎ，
Ｎ−ジアルキルアミド化物が、結晶化しにくい構造であ
り、かつ他のアミド化物に比べて融点が低い（殆どが０
℃以下）ため表面に十分量が存在しても低温経時により
結晶化せず安定した走行耐久性を得る事ができる。また
本発明の化合物を数種混合する事によって融点降下によ
り更に融点及び結晶性を抑制する事ができる。In general, amidated fatty acids do not hydrolyze and have excellent long-term storage stability compared to esterified fatty acids, but they have very low solubility with binders and when added in an amount that provides lubricity. It had the property of making the physical properties of the magnetic layer brittle. Therefore, N,N-alkyl amidides of fatty acids were developed to increase the solubility in binders, but amidates generally have a high melting point and are easy to crystallize, so some of the amidides present on the surface Crystallizes when stored at low temperatures, etc.
This caused runnability or clogging. Therefore, the methyl branched N of the present invention in which 4 or more methyl branches are separated from the terminal,
N-dialkylamidates have a structure that is difficult to crystallize and have a lower melting point than other amidates (mostly 0
℃ or less), so even if a sufficient amount is present on the surface, it will not crystallize over time at low temperatures and can provide stable running durability. Further, by mixing several kinds of compounds of the present invention, the melting point and crystallinity can be further suppressed by lowering the melting point.
【００２９】また、本発明の化合物は、特に、塗布型磁
気記録媒体の結合剤として極性基含有の結合剤（バイン
ダー）を用いた場合にその効果を顕著に奏するものであ
る。なぜなら、本発明の化合物はアミド基を持つため、
極性基をもつ結合剤に特に溶解し易く、磁性層に均一に
存在し、かつテープ走行により表面に滲み出してくるた
め良好な潤滑性能を長期間にわたって維持することが出
来る。Further, the compound of the present invention exhibits remarkable effects particularly when a polar group-containing binder is used as a binder for a coated magnetic recording medium. This is because the compound of the present invention has an amide group,
It is particularly easily soluble in binders having polar groups, exists uniformly in the magnetic layer, and oozes out to the surface as the tape runs, so it can maintain good lubrication performance over a long period of time.
【００３０】本発明のメチル分岐型脂肪族炭化水素基を
含むＮ，Ｎ−ジアルキルアミド化合物の一般式における
メチル分岐炭化水素基であるＲ１ には潤滑性を低下さ
せず、かつ結晶性を下げるという観点からｎが１以上１
２以下のものが時に望ましい。またＲ２ 、Ｒ３ は、
炭素数が１以上２２以下のメチル分岐型脂肪族炭化水素
基を含むＮ，Ｎ−ジアルキルアミド化物であれば分子量
、分岐構造、不飽和結合、異性体構造によらず選択する
ことができるが、好ましくは、非芳香族系炭化水素基（
ただし、アラルキル基等は包含される。）であり、特に
、直鎖アルキル基が好ましい。その中でも、更に好まし
くは、炭素数が１以上６以下のアルキル基であるものが
潤滑剤の結晶性を低下させかつ走行耐久性を変化させな
いという観点から望ましい。[0030] R1, which is a methyl branched hydrocarbon group in the general formula of the N,N-dialkylamide compound containing a methyl branched aliphatic hydrocarbon group of the present invention, has a methyl branched hydrocarbon group that does not reduce lubricity and reduces crystallinity. From the point of view, n is 1 or more and 1
2 or less is sometimes desirable. Also, R2 and R3 are
Any N,N-dialkylamidated product containing a methyl branched aliphatic hydrocarbon group having 1 to 22 carbon atoms can be selected regardless of molecular weight, branched structure, unsaturated bond, and isomer structure. Preferably, a non-aromatic hydrocarbon group (
However, aralkyl groups and the like are included. ), and straight-chain alkyl groups are particularly preferred. Among these, those having an alkyl group having 1 or more and 6 or less carbon atoms are more preferable from the viewpoint of reducing the crystallinity of the lubricant and not changing the running durability.
【００３１】また全体の炭素数としては３６以下が好ま
しい。３６以上であると融点が高くなり保存後の耐久性
の劣化および溶剤への溶解性が極度に悪くなり製造工程
で均一に磁性層或いは磁性層表面に存在させることは難
しくなり安定した潤滑性を発揮できなくなる。The total number of carbon atoms is preferably 36 or less. If it is 36 or higher, the melting point will be high, the durability after storage will deteriorate, and the solubility in solvents will be extremely poor, making it difficult to make it exist uniformly on the magnetic layer or the surface of the magnetic layer during the manufacturing process, making it difficult to maintain stable lubricity. You won't be able to perform well.
【００３２】また本発明のメチル分岐型脂肪族を含むＮ
，Ｎ−ジアルキルアミド化物は、単独で使うよりも数種
混合した方が潤滑剤全体の融点が下がり、さらに結晶性
が抑制されるため特に望ましい。混合させるのは、上記
化合物であれば分子量および構造によらず選択できる。[0032] Also, the N containing methyl branched aliphatic of the present invention
, N-dialkylamidates are particularly preferable when used in combination than when used alone, since the melting point of the lubricant as a whole is lowered and crystallinity is further suppressed. The compound to be mixed can be selected from any of the above compounds, regardless of their molecular weight and structure.
【００３３】具体的には以下の化学構造式で示される。Specifically, it is shown by the following chemical structural formula.
【００３４】[0034]
【化０７】[C07]
【００３５】[0035]
【化０８】[C08]
【００３６】これらの化合物は市販されているメチル分
岐の脂肪酸のＥｍｅｒｓｏｌ ８７１あるいは８７５
をメタノール等に溶かし、塩酸を入れ加熱して脱水反応
しメチルエステル化した後、カラム処理および減圧蒸溜
を繰り返し行うことにより各々のメチル分岐脂肪酸のメ
チルエステルを得ることができ、その後、アセトン、エ
チルメチルエーテル等の溶剤に溶かし、水と塩酸を加え
て加熱し、加水分解してメチル分岐の脂肪酸を得る。そ
の後一般式１の化合物を得るためには上記のようにして
精製したメチル分岐脂肪酸をベンゼン、アセトン、メチ
ルエチルケトン、ヘキサン等の溶剤に溶かし、それに五
塩化燐を加えて加熱しメチル分岐脂肪酸の塩化物を得た
後、アルキルアミンを加えて氷冷或いは暖めながら反応
させた後、減圧蒸溜し一般式（１）のアミド化物を得る
事ができる。These compounds are commercially available methyl branched fatty acids Emersol 871 or 875.
After dissolving in methanol etc., adding hydrochloric acid and heating to cause dehydration reaction and methyl esterification, the methyl esters of each methyl branched fatty acid can be obtained by repeating column treatment and vacuum distillation. Dissolve in a solvent such as methyl ether, add water and hydrochloric acid, heat, and hydrolyze to obtain methyl branched fatty acids. Thereafter, in order to obtain the compound of general formula 1, the methyl branched fatty acid purified as described above is dissolved in a solvent such as benzene, acetone, methyl ethyl ketone, hexane, etc., and phosphorus pentachloride is added thereto and heated to obtain the chloride of the methyl branched fatty acid. After that, an alkylamine is added and the mixture is reacted with ice cooling or heating, followed by distillation under reduced pressure to obtain an amidated product of the general formula (1).
【００３７】本発明のアミド化合物の使用量は通常の塗
布型磁気記録媒体の磁性層に内添する場合、強磁性粉末
に対して、１〜１０重量％が適当である。塗布型磁気記
録媒体の磁性層の表面にトップコートする場合は２〜５
０ｍｇ／ｍ２ が適当である。使用量がこの範囲を超え
ると表面のメチル分岐型脂肪族炭化水素基を含むＮ，Ｎ
−ジアルキルアミド化物が過剰になり、粘りつき、吸湿
等の故障の原因になることがあるだけでなく、内添型の
場合には磁性層バインダーを可塑化する作用により却っ
て耐久性が低下する等の問題がある。使用量がこの範囲
を下回ると当然のことながら表面に存在する量が不十分
となり効果が得られない。When the amide compound of the present invention is added internally to the magnetic layer of a conventional coated magnetic recording medium, the appropriate amount is 1 to 10% by weight based on the ferromagnetic powder. 2 to 5 when topcoating the surface of the magnetic layer of a coated magnetic recording medium.
0 mg/m2 is appropriate. If the amount used exceeds this range, N,N containing methyl branched aliphatic hydrocarbon groups on the surface
- Excess dialkylamide may not only cause problems such as stickiness and moisture absorption, but also, in the case of an internally added type, it may actually reduce durability due to the effect of plasticizing the magnetic layer binder. There is a problem. If the amount used is below this range, naturally the amount present on the surface will be insufficient and no effect will be obtained.
【００３８】また、本発明においては、その他の潤滑剤
を混在させてもよい。併用できる潤滑剤としては、ミリ
スチン酸、ステアリン酸、オレイン酸等の飽和あるいは
不飽和の脂肪酸、金属石鹸、Ｎ置換あるいはＮ未置換の
脂肪酸アミド、各種モノエステルをはじめソルビタン、
グリセリン等の多価エステルの脂肪酸エステル、多塩基
酸のエステル化物等の脂肪酸エステル、エーテル結合を
有するエステル化合物、高級脂肪族アルコール、モノア
ルキルフォスフェート，ジアルキルフォスフェート，ト
リアルキルフォスフェート、パラフィン類、シリコーン
オイル、動植物油、鉱油、高級脂肪族アミン、あるいは
グラファイト、シリカ、二硫化モリブデン、二硫化タン
グステン等の無機微粉末、ポリエチレン、ポリプロピレ
ン、ポリ塩化ビニル、エチレン−塩化ビニル共重合体、
ポリテトラフルオロエチレン等の樹脂微粉末、αオレフ
ィン重合物、常温で液体の不飽和脂肪族炭化水素、末端
変性または未変性のパーフルオロアルキルポリエーテル
、フルオロカーボン類等があげられる。Further, in the present invention, other lubricants may be mixed. Lubricants that can be used in combination include saturated or unsaturated fatty acids such as myristic acid, stearic acid, and oleic acid, metal soaps, N-substituted or unsubstituted fatty acid amides, various monoesters, and sorbitan.
Fatty acid esters of polyvalent esters such as glycerin, fatty acid esters such as esters of polybasic acids, ester compounds with ether bonds, higher aliphatic alcohols, monoalkyl phosphates, dialkyl phosphates, trialkyl phosphates, paraffins, silicone oil, animal and vegetable oil, mineral oil, higher aliphatic amine, or inorganic fine powder such as graphite, silica, molybdenum disulfide, tungsten disulfide, polyethylene, polypropylene, polyvinyl chloride, ethylene-vinyl chloride copolymer,
Examples include fine resin powders such as polytetrafluoroethylene, α-olefin polymers, unsaturated aliphatic hydrocarbons that are liquid at room temperature, terminally modified or unmodified perfluoroalkyl polyethers, and fluorocarbons.
【００３９】これらの混在する潤滑剤の好ましい使用量
は使用態様によって様々であるが、おおむね、本発明の
アミド化合物の１／１０ないし２倍の使用量である。[0039] The preferred amount of these mixed lubricants varies depending on the mode of use, but is generally 1/10 to 2 times the amount of the amide compound of the present invention.
【００４０】本発明において、メチル分岐型脂肪酸のＮ
，Ｎ−ジアルキルアミド化物を磁性層に保持させる方法
としては、磁性層に含有させる方法と、メチル分岐型脂
肪酸のＮ，Ｎ−ジアルキルアミド化物を有機溶剤に溶解
して基板に塗布あるいは噴霧したのち乾燥する方法、溶
融して基板に塗布させる方法、有機溶剤に溶解した溶液
に基板を浸潰して材料を基板表面に吸着させる方法、ラ
ングミュアー・ブロジェット法などにより表面にトップ
コートする方法がある。In the present invention, N of methyl branched fatty acid
,N-dialkylamidates are retained in the magnetic layer, two methods are to include them in the magnetic layer, and one is to dissolve the N,N-dialkylamides of methyl branched fatty acids in an organic solvent and apply or spray it on the substrate. There are methods such as drying, melting and applying to the substrate, soaking the substrate in a solution dissolved in an organic solvent and adsorbing the material to the substrate surface, and top coating the surface using the Langmuir-Blodgett method. .
【００４１】本発明に用いられる強磁性粉末としては、
強磁性酸化鉄微粉末、コバルトドープの強磁性酸化鉄微
粉末、強磁性二酸化クロム微粉末、強磁性金属粉末、強
磁性合金粉末、バリウムフェライトなどが使用できる。The ferromagnetic powder used in the present invention is as follows:
Ferromagnetic iron oxide fine powder, cobalt-doped ferromagnetic iron oxide fine powder, ferromagnetic chromium dioxide fine powder, ferromagnetic metal powder, ferromagnetic alloy powder, barium ferrite, etc. can be used.
【００４２】強磁性合金粉末の例としては、金属分が７
５重量％以上であり、金属分の８０重量％以上が少なく
とも一種類の鉄、コバルト、ニッケル等の金属、鉄−コ
バルト、鉄−ニッケル、コバルト−ニッケル、コバルト
−鉄−ニッケルなどの合金であり、該金属分の２０重量
％以下で他の成分（Ａｌ、Ｓｉ、Ｓ、Ｓｃ、Ｔｉ、Ｖ、
Ｃｒ、Ｍｎ、Ｃｕ、Ｚｎ、Ｙ、Ｍｏ、Ｒｈ、Ｐｄ、Ａｇ
、Ｓｎ、Ｓｂ、Ｂ、Ｂａ、Ｔａ、Ｗ、Ｒｅ、Ａｕ、Ｈｇ
、Ｐｂ、Ｐ、Ｌａ、Ｃｅ、Ｐｒ、Ｎｄ、Ｔｅ、Ｂｉなど
）を含むものをあげることができる。また、上記強磁性
金属分が少量の水、水酸化物、または酸化物を含むもの
であってもよい。As an example of ferromagnetic alloy powder, the metal content is 7
5% by weight or more, and 80% by weight or more of the metal content is at least one metal such as iron, cobalt, nickel, or an alloy such as iron-cobalt, iron-nickel, cobalt-nickel, cobalt-iron-nickel, etc. , other components (Al, Si, S, Sc, Ti, V,
Cr, Mn, Cu, Zn, Y, Mo, Rh, Pd, Ag
, Sn, Sb, B, Ba, Ta, W, Re, Au, Hg
, Pb, P, La, Ce, Pr, Nd, Te, Bi, etc.). Further, the ferromagnetic metal component may contain a small amount of water, hydroxide, or oxide.
【００４３】これらの強磁性粉末の製法は既知であり、
本発明で用いられる強磁性粉末についても公知の方法に
従って製造することができる。[0043] The manufacturing method of these ferromagnetic powders is known;
The ferromagnetic powder used in the present invention can also be manufactured according to known methods.
【００４４】強磁性粉末の形状、サイズは特に制限なく
広く用いることができる。形状としては針状、米粒状、
球状、立方体状、板状等いずれでもよいが針状、板状が
電磁変換特性上好ましい。結晶子サイズ、比表面積もと
くに制限はないが、結晶子サイズで４０ｎｍ以下、標準
ＢＥＴ法で３０ｍ２／ｇ以上が好ましい。強磁性粉末の
ｐＨは制限なく用いることができ、表面処理も種々の方
法によって行うことができる。具体的には、チタン、ケ
イ素、アルミニウム等の元素を含む物質で表面処理され
ていてもよいし、カルボン酸、スルホン酸、硫酸エステ
ル、ホスホン酸、燐酸エステル、ベンゾトリアゾール等
の含窒素複素環をもつ吸着性化合物の様な有機化合物で
処理されていてもよい。The shape and size of the ferromagnetic powder are not particularly limited and can be widely used. The shape is needle-like, rice-grain-like,
The shape may be spherical, cubic, plate-like, etc., but needle-shape and plate-shape are preferable from the viewpoint of electromagnetic conversion characteristics. There are no particular restrictions on the crystallite size or specific surface area, but the crystallite size is preferably 40 nm or less, and 30 m2/g or more by standard BET method. The pH of the ferromagnetic powder can be used without any restriction, and the surface treatment can also be performed by various methods. Specifically, the surface may be treated with a substance containing elements such as titanium, silicon, aluminum, etc., or nitrogen-containing heterocycles such as carboxylic acid, sulfonic acid, sulfuric acid ester, phosphonic acid, phosphoric acid ester, benzotriazole, etc. It may also be treated with an organic compound such as an adsorbent compound.
【００４５】好ましいｐＨの範囲は５〜１０である。強
磁性酸化鉄微粉末の場合、２価の鉄／３価の鉄の比に特
に制限されることなく用いることができる。The preferred pH range is 5-10. In the case of ferromagnetic iron oxide fine powder, it can be used without any particular restriction on the ratio of divalent iron/trivalent iron.
【００４６】本発明に用いられる結合剤は従来、磁気記
録媒体用の結合剤として使用されている公知の熱可塑性
樹脂、熱硬化性樹脂、放射線硬化性樹脂、反応型樹脂お
よびこれらの混合物を使用することができ、上記樹脂の
ガラス転移温度Ｔｇは−４０℃ないし１５０℃、重量平
均分子量は１万ないし３０万、好ましくは１万ないし１
０万である。As the binder used in the present invention, known thermoplastic resins, thermosetting resins, radiation-curable resins, reactive resins, and mixtures thereof, which have been conventionally used as binders for magnetic recording media, can be used. The glass transition temperature Tg of the resin is -40°C to 150°C, and the weight average molecular weight is 10,000 to 300,000, preferably 10,000 to 1.
It is 00,000.
【００４７】上記熱可塑性樹脂としては、塩化ビニル・
酢酸ビニル共重合体、塩化ビニル、酢酸ビニルとビニル
アルコール、マレイン酸および／またはアクリル酸との
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、エチレン・酢酸ビ
ニル共重合体などのビニル系共重合体、ニトロセルロー
ス、セルロースアセテートプロピオネート、セルロース
アセテートブチレート樹脂などのセルロース誘導体、ア
クリル樹脂、ポリビニルアセタール樹脂、ポリビニルブ
チラール樹脂、ポリエステルポリウレタン樹脂、ポリエ
ーテルポリウレタン、ポリカーボネートポリウレタン樹
脂、ポリエステル樹脂、ポリエーテル樹脂、ポリアミド
樹脂、アミノ樹脂、スチレンブタジエン樹脂、ブタジエ
ンアクリロニトリル樹脂等のゴム系樹脂、シリコーン系
樹脂、フッ素系樹脂を挙げることができる。[0047] As the thermoplastic resin, vinyl chloride
Vinyl acetate copolymer, vinyl chloride, copolymer of vinyl acetate and vinyl alcohol, maleic acid and/or acrylic acid, vinyl chloride/vinylidene chloride copolymer, vinyl chloride/acrylonitrile copolymer, ethylene/vinyl acetate copolymer Vinyl copolymers such as polymers, cellulose derivatives such as nitrocellulose, cellulose acetate propionate, cellulose acetate butyrate resin, acrylic resin, polyvinyl acetal resin, polyvinyl butyral resin, polyester polyurethane resin, polyether polyurethane, polycarbonate polyurethane Rubber resins such as resins, polyester resins, polyether resins, polyamide resins, amino resins, styrene-butadiene resins, butadiene-acrylonitrile resins, silicone-based resins, and fluorine-based resins can be mentioned.
【００４８】これらの中で、塩化ビニル系樹脂は強磁性
微粉末の分散性が高く好ましい。上記熱硬化性樹脂また
は、反応型樹脂としては加熱により分子量が極めて大き
くなるもので、たとえばフェノール樹脂、フェノキシ樹
脂、エポキシ樹脂、硬化型ポリウレタン樹脂、尿素樹脂
、メラミン樹脂、アルキッド樹脂、シリコン樹脂、アク
リル系反応樹脂、エポキシ−ポリアミド樹脂、ニトロセ
ルロースメラミン樹脂、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、ポリアミン樹脂、
およびこれらの混合物が挙げられる。Among these, vinyl chloride resin is preferred because it has high dispersibility of ferromagnetic fine powder. The above thermosetting resins or reactive resins are those whose molecular weight becomes extremely large when heated, such as phenol resin, phenoxy resin, epoxy resin, curable polyurethane resin, urea resin, melamine resin, alkyd resin, silicone resin, acrylic resin. system reaction resin, epoxy-polyamide resin, nitrocellulose melamine resin, mixture of high molecular weight polyester resin and isocyanate prepolymer, polyamine resin,
and mixtures thereof.
【００４９】上記放射線硬化型樹脂としては上記熱可塑
性樹脂に放射線硬化官能基として炭素−炭素不飽和結合
を有する基を結合させたものが用いられる。好ましい官
能基としてはアクリロイル基、メタクリロイル基などが
ある。The radiation-curable resin used is one in which a group having a carbon-carbon unsaturated bond is bonded to the thermoplastic resin as a radiation-curable functional group. Preferred functional groups include acryloyl and methacryloyl groups.
【００５０】以上列挙した結合剤の分子中に、エポキシ
基、ＣＯ２ Ｍ、ＯＨ、ＮＲ２ 、ＮＲ３ Ｘ、ＳＯ３
Ｍ、ＯＳＯ３ Ｍ、ＰＯ３ Ｍ２ 、ＯＰＯ３ Ｍ２
、（ただしＭは水素、アルカリ金属またはアンモニウ
ムであり、一つの基の中に複数のＭがあるときは互いに
異なっていてもよい、Ｒは水素またはアルキル基である
）等の極性基を導入したものが強磁性粉末の分散性、耐
久性上好ましく、本発明のメチル分岐型脂肪族炭化水素
基を含むＮ，Ｎ−ジアルキルアミド化物の添加効果が顕
著に現れる。極性基の含有量としてはポリマー１グラム
当たり１０−７〜１０−３当量が好ましく、さらには１
０−６〜１０−４当量が好ましい範囲である。[0050] In the molecules of the binders listed above, epoxy groups, CO2 M, OH, NR2, NR3 X, SO3
M, OSO3 M, PO3 M2, OPO3 M2
(However, M is hydrogen, an alkali metal, or ammonium, and when there are multiple M's in one group, they may be different from each other, and R is hydrogen or an alkyl group). It is preferable in view of the dispersibility and durability of the ferromagnetic powder, and the effect of adding the N,N-dialkylamidate containing a methyl branched aliphatic hydrocarbon group of the present invention is noticeable. The content of polar groups is preferably 10-7 to 10-3 equivalents per gram of polymer, and more preferably 1 to 10-3 equivalents per gram of polymer.
The preferred range is 0-6 to 10-4 equivalents.
【００５１】極性基の含有量としては１０−７当量未満
であると相互作用する潤滑剤量が少なくなるため均一な
配向膜を形成するのが難しくなり滑り性が低下する。ま
た１０−３当量より多いと結合剤の粘度が上がり分散性
が低下するため好ましくない。If the content of the polar group is less than 10 -7 equivalents, the amount of lubricant that interacts with the lubricant decreases, making it difficult to form a uniform alignment film and reducing the slipperiness. Moreover, if the amount is more than 10@-3 equivalent, the viscosity of the binder increases and the dispersibility decreases, which is not preferable.
【００５２】以上列挙した高分子結合剤は単独または数
種混合で使用され、イソシアネート系の公知の架橋剤、
および／あるいは放射線硬化型ビニル系モノマーを添加
して硬化処理することができる。The polymer binders listed above may be used alone or in combination, and include known isocyanate-based crosslinking agents,
And/or a radiation-curable vinyl monomer can be added for curing treatment.
【００５３】イソシアネート系架橋剤としてはイソシア
ネート基を２個以上有するポリイソシアネート化合物で
、たとえばトリレンジイソシアネート、４、４’−ジフ
ェニルメタンジイソシアネート、ヘキサメチレンジイソ
シアネート、キシリレンジイソシアネート、ナフチレン
−１、５−ジイソシアネート、ｏ−トルイジンジイソシ
アネート、イソホロンジイソシアネート、トリフェニル
メタンジイソシアネートなどのイソシアネート類、これ
らのイソシアネート類とポリアルコールとの反応生成物
、及びこれらのイソシアネート類の縮合により生成した
ポリイソシアネートなどが挙げられる。これらのポリイ
ソシアネートは日本ポリウレタン工業（株）からコロネ
ートＬ、コロネートＨＬ、コロネートＨ、コロネートＥ
Ｈ、コロネート２０１４、コロネート２０３０、コロネ
ート２０３１、コロネート２０３６、コロネート３０１
５、コロネート３０４０、コロネート３０４１、ミリオ
ネートＭＲ、ミリオネートＭＴＬ、ダルトセック１３５
０、ダルトセック２１７０、ダルトセック２２８０、武
田薬品工業（株）からタケネートＤ１０２、タケネート
Ｄ１１０Ｎ、タケネートＤ２００、タケネートＤ２０２
、住友バイエル（株）から、スミジュールＮ７５、独バ
イエル社からデスモジュールＬ、デスモジュールＩＬ、
デスモジュールＮ、デスモジュールＨＬ、大日本インキ
化学工業（株）からバーノックＤ８５０、バーノックＤ
８０２などの商品名で市販されている。The isocyanate crosslinking agent is a polyisocyanate compound having two or more isocyanate groups, such as tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, naphthylene-1,5-diisocyanate, Examples include isocyanates such as o-toluidine diisocyanate, isophorone diisocyanate, and triphenylmethane diisocyanate, reaction products of these isocyanates and polyalcohols, and polyisocyanates produced by condensation of these isocyanates. These polyisocyanates are available from Nippon Polyurethane Industries Co., Ltd. as Coronate L, Coronate HL, Coronate H, and Coronate E.
H, Coronate 2014, Coronate 2030, Coronate 2031, Coronate 2036, Coronate 301
5. Coronate 3040, Coronate 3041, Millionate MR, Millionate MTL, Daltosec 135
0, Daltosec 2170, Daltosec 2280, Takenate D102, Takenate D110N, Takenate D200, Takenate D202 from Takeda Pharmaceutical Co., Ltd.
, Sumidur N75 from Sumitomo Bayer, Desmodur L, Desmodul IL from Bayer, Germany.
Desmodule N, Desmodule HL, Burnock D850, Burnock D from Dainippon Ink & Chemicals Co., Ltd.
It is commercially available under trade names such as 802.
【００５４】放射線硬化ビニル系モノマーとしては、放
射線照射によって重合可能な化合物であって、炭素−炭
素不飽和結合を分子中に１個以上有する化合物であり、
（メタ）アクリル酸エステル類、（メタ）アクリルアミ
ド類、アリル化合物、ビニルエーテル類、ビニルエステ
ル類、ビニル異節環化合物、Ｎ−ビニル化合物、スチレ
ン、（メタ）アクリル酸、クロトン酸、イタコン酸、オ
レフィン類等があげられる。これらのうち好ましいもの
として（メタ）アクリロイル基を２個以上有する、ジエ
チレングリコールジ（メタ）アクリレート、トリエチレ
ングリコールジ（メタ）アクリレート、などのポリエチ
リングリコールの（メタ）アクリレート類、トリメチロ
ールプロパントリ（メタ）アクリレート、ペンタエリス
リトールテトラ（メタ）アクリレート、ジペンタエリス
リトールペンタ（メタ）アクリレート、ジペンタエリス
トリトールヘキサ（メタ）アクリレート、ポリイソシア
ネートとヒドロキシ（メタ）アクリレート化合物との反
応物等がある。The radiation-curable vinyl monomer is a compound that can be polymerized by radiation irradiation and has one or more carbon-carbon unsaturated bonds in its molecule,
(meth)acrylic acid esters, (meth)acrylamides, allyl compounds, vinyl ethers, vinyl esters, vinyl heterocyclic compounds, N-vinyl compounds, styrene, (meth)acrylic acid, crotonic acid, itaconic acid, olefins Examples include the following. Among these, preferred are (meth)acrylates of polyethylene glycol, such as diethylene glycol di(meth)acrylate and triethylene glycol di(meth)acrylate, which have two or more (meth)acryloyl groups, and trimethylolpropane tri( Examples include meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and a reaction product of a polyisocyanate and a hydroxy(meth)acrylate compound.
【００５５】これらの架橋剤は、架橋剤を含む全結合剤
の５重量％ないし４５重量％であることが好ましい。[0055] These crosslinking agents preferably represent 5% to 45% by weight of the total binder including crosslinking agents.
【００５６】本発明の磁性層における前記全結合剤（架
橋剤も含む）の配合は強磁性粉末に対し１０重量％ない
し４０重量％、好ましくは１５重量％ないし３０重量％
である。結合剤の配合割合が前記範囲より大きいと強磁
性粉末の充填度が低く電磁変換特性が低下し、逆に少な
いと走行耐久性が低下する。The total amount of the binder (including the crosslinking agent) in the magnetic layer of the present invention is 10% to 40% by weight, preferably 15% to 30% by weight based on the ferromagnetic powder.
It is. If the blending ratio of the binder is larger than the above range, the degree of filling of the ferromagnetic powder will be low and the electromagnetic conversion characteristics will be degraded, and if it is too small, the running durability will be reduced.
【００５７】非磁性支持体の材質としては、ポリエチレ
ンテレフタレート、ポリエチレン２．６−ナフタレート
などのポリエステル類、ポリエチレン、ポリプロピレン
などのポリオレフィン類、セルローストリアセテートな
どのセルロース誘導体、ポリカーボネート、ポリイミド
、ポリアミドイミド等の樹脂を用いることができ、必要
に応じアルミニウム等の金属でメタライズしてあっても
よいし、あるいはアルミニウム箔、ステンレス箔などの
金属箔であってもよい。また支持体の形態はテープ、デ
ィスク、フィルム、シート、カード、ドラムなどいずれ
でもよく、形態に応じて種々の材料が選択される。支持
体の厚みは３μｍないし１００μｍ、磁気テープとして
は好ましくは３μｍないし２０μｍ、磁気ディスクとし
ては２０μｍないし１００μｍが通常使用される範囲で
ある。Materials for the nonmagnetic support include polyesters such as polyethylene terephthalate and polyethylene 2,6-naphthalate, polyolefins such as polyethylene and polypropylene, cellulose derivatives such as cellulose triacetate, resins such as polycarbonate, polyimide, and polyamideimide. If necessary, it may be metallized with a metal such as aluminum, or may be a metal foil such as aluminum foil or stainless steel foil. The support may be in any form such as a tape, disk, film, sheet, card, or drum, and various materials are selected depending on the form. The thickness of the support is usually in the range of 3 μm to 100 μm, preferably 3 μm to 20 μm for magnetic tapes, and 20 μm to 100 μm for magnetic disks.
【００５８】本発明の磁気記録媒体の磁性層には、さら
にモース硬度５以上の無機質粒子を含有することが好ま
しい。使用される無機質粒子は、モース硬度が５以上で
あれば特に制限はない。モース硬度が５以上の無機質粒
子の例としては、Ａｌ２ ０３ モース硬度９）、Ｔｉ
０（同６）、ＴｉＯ２ （同６．５）、ＳｉＯ２ （同
７）、Ｓｎ０２ （同６．５）、Ｃｒ２ ０３ （同９
）、およびα−Ｆｅ２０３ （同５．５）を挙げること
ができ、これらを単独あるいは混合して用いることがで
きる。The magnetic layer of the magnetic recording medium of the present invention preferably further contains inorganic particles having a Mohs hardness of 5 or more. The inorganic particles used are not particularly limited as long as they have a Mohs hardness of 5 or more. Examples of inorganic particles having a Mohs hardness of 5 or more include Al2 03 Mohs hardness 9), Ti
0 (6), TiO2 (6.5), SiO2 (7), Sn02 (6.5), Cr2 03 (9
), and α-Fe203 (5.5), which can be used alone or in combination.
【００５９】特に好ましいのはモース硬度が８以上の無
機質粒子である。モース硬度が５よりも低い無機質粒子
を用いた場合には、磁性層から無機質粒子が脱落しやす
く、またヘッドの研磨作用もほとんどないため、ヘッド
目詰まりを発生しやすく、また走行耐久性も乏しくなる
。Particularly preferred are inorganic particles having a Mohs hardness of 8 or more. When inorganic particles with a Mohs hardness lower than 5 are used, the inorganic particles tend to fall off from the magnetic layer and have almost no abrasive action on the head, resulting in head clogging and poor running durability. Become.
【００６０】無機質粒子の含有量は、通常強磁性粉末１
００重量部に対して０．１重量部ないし２０重量部の範
囲であり、好ましくは１重量部ないし１０重量部の範囲
である。また磁性層には上記の無機質粒子以外にも、カ
ーボンブラック、特に平均粒経が１０ｎｍないし３００
ｎｍのものなどを含有させることが望ましい。The content of inorganic particles is usually 1
The range is from 0.1 parts by weight to 20 parts by weight, preferably from 1 part by weight to 10 parts by weight. In addition to the above-mentioned inorganic particles, the magnetic layer also contains carbon black, especially with an average particle size of 10 nm to 300 nm.
It is desirable to include a material with a nanometer diameter.
【００６１】つぎに本発明の磁気記録媒体を製造する方
法の例を述べる。Next, an example of a method for manufacturing the magnetic recording medium of the present invention will be described.
【００６２】まず、強磁性粉末と結合剤、必要に応じて
、他の充填材、添加剤などを溶剤と混練、分散し、磁性
塗料を調製する。混練の際に使用する溶剤としては、磁
性塗料の調製に通常使用されている溶剤を使用すること
ができる。First, a magnetic coating material is prepared by kneading and dispersing ferromagnetic powder, a binder, and, if necessary, other fillers and additives in a solvent. As the solvent used during kneading, solvents commonly used for preparing magnetic paints can be used.
【００６３】混練の方法にも特に制限はなく、また各成
分の添加順序などは適宜設定することができる。[0063] There are no particular restrictions on the kneading method, and the order of addition of each component can be set as appropriate.
【００６４】例えば、潤滑剤、添加剤や架橋剤を有機溶
剤に溶解したものを用意しておき、溶剤、結合剤、強磁
性粉末等で調製した磁性体分散液に塗布直前に添加する
こともできる。For example, lubricants, additives, and crosslinking agents may be prepared by dissolving them in an organic solvent and added to the magnetic dispersion prepared from the solvent, binder, ferromagnetic powder, etc. immediately before coating. can.
【００６５】磁性塗料を調製する際には、分散剤、帯電
防止剤、潤滑剤等の公知の添加剤を併せて使用すること
もできる。When preparing the magnetic paint, known additives such as dispersants, antistatic agents, lubricants, etc. may also be used.
【００６６】分散剤の例としては、炭素数１２〜２２の
脂肪酸、その塩またはエステル化物およびその化合物の
水素の一部あるいは全部をフッ素原子で置換した化合物
、上記の脂肪酸のアミド、脂肪族アミン、高級アルコー
ル、ポリアルキレンオキサイドアルキル燐酸エステル、
アルキル燐酸エステル、アルキルホウ酸エステル、サル
コシネート類、アルキルエーテルエステル類、トリアル
キルポリオレフィン、オキシ第４級アンモニウム塩およ
びレシチン、低分子エポキシ化合物などの公知の分散剤
を挙げることができる。Examples of dispersants include fatty acids having 12 to 22 carbon atoms, salts or esters thereof, compounds in which part or all of the hydrogen atoms of these compounds are replaced with fluorine atoms, amides of the above fatty acids, and aliphatic amines. , higher alcohol, polyalkylene oxide alkyl phosphate,
Known dispersants such as alkyl phosphates, alkyl borates, sarcosinates, alkyl ether esters, trialkyl polyolefins, oxyquaternary ammonium salts, lecithin, and low-molecular-weight epoxy compounds can be mentioned.
【００６７】分散剤を使用する場合は、通常は使用する
強磁性粉末１００重量部に対し、０．１重量部ないし１
０重量部の範囲で使用される。When a dispersant is used, it is usually 0.1 part by weight to 1 part by weight per 100 parts by weight of the ferromagnetic powder used.
It is used in a range of 0 parts by weight.
【００６８】帯電防止剤の例としては、カーボンブラッ
ク、カーボンブラックグラフトポリマー等の誘電性微粉
末、サポニンなどの天然界面活性剤、アルキレンオキサ
イド系、グリセリン系およびグリシドール系等のノニオ
ン系界面活性剤、高級アルキルアミン類、第４級アンモ
ニウム塩類、ピリジンその他の複素環化合物の塩類、ホ
スホニウムまたはスルホニウム類などのカチオン性界面
活性剤、カルボン酸、燐酸、硫酸エステル基、燐酸エス
テル基等の酸性基を含むアニオン性界面活性剤、アミノ
酸類、アミノスルホン酸類、アミノアルコールの硫酸ま
たは燐酸エステル類等の両性界面活性剤等を挙げること
ができる。帯電防止剤として上記の導電性微粉末を使用
する場合には、例えば強磁性粉末１００重量部に対し０
．１重量部ないし１０重量部の範囲で使用され、界面活
性剤を使用する場合にも同様に０．１２重量部ないし１
０重量部の範囲で使用される。Examples of antistatic agents include dielectric fine powders such as carbon black and carbon black graft polymers, natural surfactants such as saponin, nonionic surfactants such as alkylene oxide type, glycerin type and glycidol type, Contains higher alkylamines, quaternary ammonium salts, salts of pyridine and other heterocyclic compounds, cationic surfactants such as phosphoniums or sulfoniums, and acidic groups such as carboxylic acids, phosphoric acids, sulfuric acid ester groups, and phosphoric ester groups. Examples include anionic surfactants, amino acids, aminosulfonic acids, amphoteric surfactants such as sulfuric acid or phosphoric acid esters of amino alcohols, and the like. When using the above conductive fine powder as an antistatic agent, for example, 0 parts by weight per 100 parts by weight of ferromagnetic powder.
．． It is used in the range of 1 part by weight to 10 parts by weight, and when a surfactant is used, it is also used in the range of 0.12 parts by weight to 1 part by weight.
It is used in a range of 0 parts by weight.
【００６９】なお、上述した分散剤、帯電防止剤、潤滑
剤などの添加剤は、厳密に上述した作用効果のみを有す
るものであるとの限定のもとに記載したものではなく、
例えば、分散剤が潤滑剤あるいは帯電防止剤として作用
することも有り得る。従って、上記分類により例示した
化合物などの作用効果が、上記分類に記載された事項に
限定されないことは勿論であり、また複数の作用効果を
奏する物質を使用する場合には、添加量は、その作用効
果を考慮して決定することが好ましい。[0069] The above-mentioned additives such as dispersants, antistatic agents, lubricants, etc. are not strictly limited to having only the above-mentioned effects;
For example, the dispersant may act as a lubricant or antistatic agent. Therefore, it goes without saying that the effects of the compounds exemplified by the above classifications are not limited to those listed in the above classifications, and when using substances that have multiple effects, the amounts added should be It is preferable to decide in consideration of the action and effect.
【００７０】このようにして調製された磁性塗料は前述
の非磁性支持体上に塗布される。このとき複数の磁性塗
料を逐次あるいは同時に重層塗布してもよい。The magnetic paint thus prepared is coated on the above-mentioned non-magnetic support. At this time, a plurality of magnetic paints may be applied sequentially or simultaneously in layers.
【００７１】塗布は、前記非磁性支持体上に直接行なう
ことも可能であるが、また、接着剤層などの中間層を介
して非磁性支持体上に塗布することもできる。ここでい
う中間層とは接着剤単独の層または結合剤中にカーボン
ブラック等の非磁性微粒子を分散してなる複合膜層等で
ある。Coating can be carried out directly onto the non-magnetic support, but it can also be applied onto the non-magnetic support via an intermediate layer such as an adhesive layer. The intermediate layer herein refers to a layer of an adhesive alone or a composite film layer formed by dispersing non-magnetic fine particles such as carbon black in a binder.
【００７２】カーボンブラックを含有する中間層は結合
剤として磁性層に用いられる種々の結合剤のなかから任
意に選ぶことがことができる。カーボンブラックの粒径
は１０ｎｍないし５０ｎｍのものが好ましく、バインダ
ー／カーボンブラックは重量比にして１００：１０から
１００：１５０が好ましい。中間層の厚みは単なる接着
剤層の場合０．１μｍないし２μｍ、非磁性粉体を含む
複合層の場合０．５〜４μｍが好ましい。[0072] The intermediate layer containing carbon black can be arbitrarily selected as a binder from among various binders used in magnetic layers. The particle size of carbon black is preferably 10 nm to 50 nm, and the weight ratio of binder/carbon black is preferably 100:10 to 100:150. The thickness of the intermediate layer is preferably 0.1 μm to 2 μm in the case of a simple adhesive layer, and 0.5 to 4 μm in the case of a composite layer containing nonmagnetic powder.
【００７３】中間層にはこのほか磁性層に用いる潤滑剤
と同じかまたは異なる潤滑剤を添加してもよい。In addition, a lubricant that is the same as or different from the lubricant used in the magnetic layer may be added to the intermediate layer.
【００７４】上記の強磁性粉末と結合剤の分散方法およ
び支持体への塗布方法などの詳細は特開昭５４−４６０
１１号および特開昭５４−２１８０５号等の各公報に記
載されている。Details of the method of dispersing the above-mentioned ferromagnetic powder and binder and the method of applying it to the support are given in Japanese Patent Laid-Open No. 54-460.
No. 11 and Japanese Unexamined Patent Publication No. 54-21805.
【００７５】このようにして塗布される磁性層の厚さは
、乾燥後の厚さで一般には約０．５μｍないし１０μｍ
の範囲、通常は０．７μｍないし６．０μｍの範囲にな
るよう塗布される。The thickness of the magnetic layer coated in this way is generally about 0.5 μm to 10 μm after drying.
It is coated to a thickness of 0.7 μm to 6.0 μm.
【００７６】非磁性支持体上に塗布された磁性層は磁気
記録媒体がテープ状で使用される場合通常、磁性層中の
強磁性粉末を配向させる処理、即ち磁場配向処理を施し
たあと、乾燥される。また逆にディスク状媒体の場合は
磁気特性の異方性をとりのぞくために、磁場による無配
向処理が施される。こののち必要により表面平滑化処理
が施された後、必要により熱硬化および／あるいは放射
線照射による硬化処理後所望の形状に裁断する。非磁性
支持体の磁性層が設けられてない側の面には、公知のバ
ック層が設けられていてもよい。When the magnetic recording medium is used in the form of a tape, the magnetic layer coated on the non-magnetic support is usually subjected to a treatment for orienting the ferromagnetic powder in the magnetic layer, that is, a magnetic field orientation treatment, and then dried. be done. On the other hand, in the case of a disk-shaped medium, non-orientation treatment is performed using a magnetic field in order to eliminate anisotropy in magnetic properties. Thereafter, the surface is smoothed if necessary, and then cured by heat curing and/or radiation irradiation if necessary, and then cut into a desired shape. A known back layer may be provided on the side of the nonmagnetic support on which the magnetic layer is not provided.
【００７７】[0077]
【実施例】次に実施例をもって本発明を具体的に説明す
るが、本発明はこれらに限定されるものではない。なお
、実施例中の「部」との表示は「重量部」を示すものと
する。EXAMPLES Next, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto. Note that "parts" in the examples indicate "parts by weight."
【００７８】実施例１
下記の組成物をニーダーとボールミルを用いて４８時間
混練分散したあと、これにポリイソシアネート５部を加
え、さらに１時間混練分散したあと、１μｍの平均孔径
を有するフィルタを用いてろ過し、磁性塗料を調製した
。得られた磁性塗料を乾燥後の厚さが４．０μｍになる
ように、厚さ１０μｍのポリエチレンテレフタレート支
持体の表面にリバースロールを用いて塗布した。Example 1 After kneading and dispersing the following composition for 48 hours using a kneader and a ball mill, 5 parts of polyisocyanate was added thereto, and after further kneading and dispersing for 1 hour, a filter having an average pore size of 1 μm was used. The mixture was filtered and a magnetic paint was prepared. The obtained magnetic paint was applied onto the surface of a polyethylene terephthalate support having a thickness of 10 μm using a reverse roll so that the thickness after drying was 4.0 μm.
【００７９】
磁性塗料の組成：
強磁性合金粉末（組成：鉄９４％、亜鉛４％、ニッ
ケル２％；抗磁力：１５００エルステッド；比表面積５
４ｍ２ ／ｇ） １００部 塩化ビニル／酢酸
ビニル／無水マレイン酸共重合体（日本ゼオン（株）製
４００Ｘ１１０Ａ、重合度４００）
（Ａ）
または
塩化ビニル／酢酸ビニル共重合体（重合度４００）
（Ｂ）を１２部 ポリエステル系ポリウレタン（重
量平均分子量４万、数平均分子量２．５万、
極性基の種類および極性基の数は表１に記載）（Ｃ）
を５部 コロネートＬ
４部
研磨剤（α−アルミナ、平均粒径０．３μｍ）
５部 潤滑剤（表１に記載）
オイレン酸
１部 ス
テアリン酸
１部 カーボンブ
ラック（平均粒径４０ｎｍ）
２部 メチルエチルケトン
３００部磁性塗料が塗布
された非磁性支持体を、磁性塗料が未乾燥の状態で３０
００ガウスの磁石で磁場配向を行ない、さらに乾燥後、
スーパーカレンダー処理を行なった後８ｍｍ幅にスリッ
トして、８ｍｍビデオテープを製造した。Composition of magnetic paint: Ferromagnetic alloy powder (composition: 94% iron, 4% zinc, 2% nickel; coercive force: 1500 Oe; specific surface area 5
4m2/g) 100 parts Vinyl chloride/vinyl acetate/maleic anhydride copolymer (manufactured by Nippon Zeon Co., Ltd. 400X110A, degree of polymerization 400)
(A)
or
Vinyl chloride/vinyl acetate copolymer (degree of polymerization 400)
12 parts of (B) polyester polyurethane (weight average molecular weight 40,000, number average molecular weight 25,000,
Types of polar groups and number of polar groups are listed in Table 1) (C)
5 parts Coronate L
4th part
Abrasive (α-alumina, average particle size 0.3 μm)
5 parts Lubricant (listed in Table 1) Eurenic acid
1 part stearic acid
1 part carbon black (average particle size 40 nm)
Part 2 Methyl ethyl ketone
A non-magnetic support coated with 300 parts of magnetic paint was coated with 300 parts of magnetic paint while the magnetic paint was still wet.
After performing magnetic field orientation with a 00 Gauss magnet and further drying,
After supercalendering, the tape was slit to a width of 8 mm to produce an 8 mm videotape.
【００８０】上記のようにして得られたビデオテープを
ＶＴＲ（富士写真フィルム（株）：ＦＵＪＩＸ−８）を
用いて−５℃の環境下でスチルモードで再生し出力が１
０ｄＢ低下するまでの時間を調べスチル耐久性を求めた
。The videotape obtained as described above was played back in still mode in an environment of -5°C using a VTR (Fuji Photo Film Co., Ltd.: FUJIX-8), and the output was 1.
The still durability was determined by measuring the time required for the drop to decrease by 0 dB.
【００８１】また、得られたビデオテープに５０ｇの張
力（Ｔ１ ）をかけて、ステンレス棒に巻きつけ角１８
０°で接触させて、この条件下でビデオテープを３．３
ｃｍ／秒の速度で走行させるのに必要な張力（Ｔ２ ）
を測定した。この測定値をもとに、下記計算式よりビデ
オテープの、摩擦係数μを求め、その結果を表２に示す
。
μ＝１／π・ｌｎ（Ｔ２／Ｔ１ ）
なお、摩擦係数の測定は４５℃、相対湿度９０％の条件
下で行った。またドロップアウトは、上記ビデオテープ
レコーダーを用いて−５℃の環境下で５分間走行テープ
長を１００パス繰り返し走行させた後、１分間に５μ秒
のドロップアウトが生じる個数を調べた。[0081] Further, a tension of 50 g (T1) was applied to the obtained videotape, and it was wound around a stainless steel rod to a corner of 18 mm.
Contact at 0°, under these conditions the videotape is 3.3
Tension required to run at a speed of cm/sec (T2)
was measured. Based on this measured value, the friction coefficient μ of the videotape was calculated using the following calculation formula, and the results are shown in Table 2. μ=1/π·ln(T2/T1) The friction coefficient was measured under conditions of 45° C. and 90% relative humidity. As for dropouts, the number of 5 μsec dropouts occurring per minute was determined after running the tape repeatedly for 100 passes for 5 minutes in an environment of −5° C. using the video tape recorder described above.
【００８２】また低温耐久保存性を調べるため−５℃で
１カ月間保存した後のドロップアウトとスチル耐久性を
調べた。[0082] In order to examine the low-temperature durability, dropout and still durability after storage at -5°C for one month were examined.
【００８３】これらの結果を表２に示す。[0083] These results are shown in Table 2.
【００８４】[0084]
【表１】[Table 1]
【００８５】[0085]
【表２】[Table 2]
【００８６】表１および表２の果より明白な如く、本発
明の、メチル分岐型脂肪酸のＮ，Ｎ−ジアルキルアミド
化物を用いた実施例はいずれも保存前後のスチル耐久性
に優れかつドロップアウトも少ないことが分かる。また
２種以上メチル分岐型脂肪酸のＮ，Ｎ−ジアルキルアミ
ド化物が存在するサンプル番号１７のものが特に保存前
後のスチル耐久性に優れかつドロップアウトも少ないこ
とを示している。As is clear from Tables 1 and 2, all of the examples using the N,N-dialkylamidates of methyl branched fatty acids of the present invention have excellent still durability before and after storage and no dropout. It can be seen that there are few In addition, sample No. 17, in which N,N-dialkylamidates of two or more types of methyl branched fatty acids are present, has particularly excellent still durability before and after storage, and shows less dropout.
【００８７】一方、本発明の化合物を使用せず、単に脂
肪酸やエステルのみを用いた場合や末端だけが分岐した
イソ脂肪族酸のアルキルアミドのみを用いた場合は、保
存後のスチル耐久性が低くかつドロップアウトが多いな
ど問題が多いことがわかる。On the other hand, when only a fatty acid or ester is used without using the compound of the present invention, or when only an alkylamide of an isoaliphatic acid with branched terminals is used, the still durability after storage is poor. It can be seen that there are many problems such as low performance and many dropouts.
【００８８】[0088]
【発明の効果】本発明は非磁性支持体上に磁性層を設け
た磁気記録媒体において磁性層が、メチル分岐型脂肪族
炭化水素基を含む一般式１で示されるＮ，Ｎ−ジアルキ
ルアミド化合物を一種以上含むことにより保存前及び−
５℃で１０カ月保存後の両者ともにスチル耐久性に優れ
、かつドロップアウトも少なく優れた磁気記録媒体が得
られる。また、温度４５℃、相対湿度９０％の条件での
摩耗係数の点でもすぐれ、走行性に優れた磁気記録媒体
が得られる。Effects of the Invention The present invention provides a magnetic recording medium in which a magnetic layer is provided on a non-magnetic support, in which the magnetic layer is composed of an N,N-dialkylamide compound represented by the general formula 1 containing a methyl branched aliphatic hydrocarbon group. Before storage and -
After storage for 10 months at 5° C., excellent magnetic recording media with excellent still durability and little dropout can be obtained. Furthermore, a magnetic recording medium with excellent wear coefficient and excellent running properties under conditions of a temperature of 45° C. and a relative humidity of 90% can be obtained.
Claims (3)
媒体において、該磁性層表面及び／又は内部に一般式１
で示されるメチル分岐型脂肪族炭化水素基を含むＮ，Ｎ
−ジアルキルアミド化合物より選ばれた少なくとも１種
以上の化合物を含むことを特徴とする磁気記録媒体。 【化０１】 ここで、Ｒ１ は一般式２に示される炭素数１１以上２
１以下のメチル分岐炭化水素基である。また、Ｒ２ 、
Ｒ３ は炭素数１以上２２以下の炭化水素基である。 【化０２】 ここで、ｍとｎは０以上の整数である。[Claim 1] A magnetic recording medium having a magnetic layer provided on a non-magnetic support, wherein the magnetic layer has the general formula 1 on the surface and/or inside the magnetic layer.
N, N containing a methyl branched aliphatic hydrocarbon group represented by
- A magnetic recording medium comprising at least one compound selected from dialkylamide compounds. Here, R1 is a carbon number of 11 or more and 2 as shown in general formula 2.
1 or less methyl branched hydrocarbon groups. Also, R2,
R3 is a hydrocarbon group having 1 to 22 carbon atoms. embedded image Here, m and n are integers of 0 or more.
族炭化水素基を含むＮ，Ｎ−ジアルキルアミド化合物を
少なくとも２種以上含むことを特徴とする請求項１記載
の磁気記録媒体。2. The magnetic recording medium according to claim 1, comprising at least two types of N,N-dialkylamide compounds containing a methyl branched aliphatic hydrocarbon group represented by the general formula 1.
１で示されるメチル分岐型脂肪族炭化水素基を含むＮ，
Ｎ−ジアルキルアミド化合物より選ばれた少なくとも１
種以上の化合物を含み、前記結合剤が−ＳＯ３ Ｍ、−
ＯＳＯ３ Ｍ、−ＰＯ３ Ｍ２ 、−ＯＰＯ３ Ｍ２
（ただしＭは水素、アルカリ金属、アンモニウム基を示
す）より選ばれた少なくとも１種以上の極性基を含むこ
とを特徴とする請求項１記載の磁気記録媒体。3. The magnetic layer is made of N containing ferromagnetic powder, a binder, and a methyl branched aliphatic hydrocarbon group represented by the general formula 1.
At least one selected from N-dialkylamide compounds
the binder is -SO3 M, -
OSO3 M, -PO3 M2, -OPO3 M2
2. The magnetic recording medium according to claim 1, wherein the magnetic recording medium contains at least one polar group selected from the group consisting of hydrogen, an alkali metal, and an ammonium group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8886091A JPH04319522A (en) | 1991-04-19 | 1991-04-19 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8886091A JPH04319522A (en) | 1991-04-19 | 1991-04-19 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04319522A true JPH04319522A (en) | 1992-11-10 |
Family
ID=13954753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8886091A Pending JPH04319522A (en) | 1991-04-19 | 1991-04-19 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04319522A (en) |
-
1991
- 1991-04-19 JP JP8886091A patent/JPH04319522A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5079085A (en) | Magnetic recording medium containing a binder which is chemically bonded to crosslinked resin fine particles contained in the magnetic layer | |
| JPH0770043B2 (en) | Magnetic recording medium | |
| JPH03130918A (en) | Magnetic recording medium | |
| JPH0233724A (en) | Magnetic recording medium | |
| US5164259A (en) | Magnetic recording medium having a specified fatty acid hydroxylaluminum salt as a lubricant contained in or on the magnetic layer | |
| JPS63261526A (en) | Magnetic recording medium | |
| JPH04319522A (en) | Magnetic recording medium | |
| JP2531158B2 (en) | Magnetic recording media | |
| US4656093A (en) | Magnetic recording media | |
| JP2615574B2 (en) | Magnetic recording media | |
| JP2601362B2 (en) | Magnetic recording media | |
| JP2601370B2 (en) | Magnetic recording media | |
| JP2601364B2 (en) | Magnetic recording media | |
| JP2576102B2 (en) | Magnetic recording media | |
| JP2576101B2 (en) | Magnetic recording media | |
| JPH0775065B2 (en) | Magnetic recording medium | |
| JP2576103B2 (en) | Magnetic recording media | |
| JPH0380422A (en) | Magnetic recording medium | |
| JPH0680528B2 (en) | Magnetic recording medium | |
| JP2530204B2 (en) | Magnetic recording media | |
| JPH0457215A (en) | Magnetic recording medium | |
| JPH0330118A (en) | Magnetic recording medium | |
| JPS6292230A (en) | Magnetic recording medium | |
| JP2667301B2 (en) | Magnetic recording media | |
| JP2856938B2 (en) | Magnetic recording media |