JPH01271914A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH01271914A JPH01271914A JP9909088A JP9909088A JPH01271914A JP H01271914 A JPH01271914 A JP H01271914A JP 9909088 A JP9909088 A JP 9909088A JP 9909088 A JP9909088 A JP 9909088A JP H01271914 A JPH01271914 A JP H01271914A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- magnetic
- salt
- binder
- recording medium
- 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 88
- 239000011230 binding agent Substances 0.000 claims abstract description 42
- 150000003839 salts Chemical class 0.000 claims abstract description 40
- 239000006247 magnetic powder Substances 0.000 claims abstract description 37
- SDGNNLQZAPXALR-UHFFFAOYSA-N 3-sulfophthalic acid Chemical compound OC(=O)C1=CC=CC(S(O)(=O)=O)=C1C(O)=O SDGNNLQZAPXALR-UHFFFAOYSA-N 0.000 claims abstract description 20
- WXHLLJAMBQLULT-UHFFFAOYSA-N 2-[[6-[4-(2-hydroxyethyl)piperazin-1-yl]-2-methylpyrimidin-4-yl]amino]-n-(2-methyl-6-sulfanylphenyl)-1,3-thiazole-5-carboxamide;hydrate Chemical compound O.C=1C(N2CCN(CCO)CC2)=NC(C)=NC=1NC(S1)=NC=C1C(=O)NC1=C(C)C=CC=C1S WXHLLJAMBQLULT-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000007935 neutral effect Effects 0.000 abstract description 16
- 239000011248 coating agent Substances 0.000 abstract description 15
- 238000000576 coating method Methods 0.000 abstract description 15
- 239000002253 acid Substances 0.000 abstract description 9
- 125000000542 sulfonic acid group Chemical group 0.000 abstract description 5
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 abstract description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 abstract description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 abstract description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 abstract 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 abstract 1
- 239000011347 resin Substances 0.000 description 18
- 229920005989 resin Polymers 0.000 description 18
- 239000000843 powder Substances 0.000 description 11
- 235000014113 dietary fatty acids Nutrition 0.000 description 10
- 229930195729 fatty acid Natural products 0.000 description 10
- 239000000194 fatty acid Substances 0.000 description 10
- 150000004665 fatty acids Chemical class 0.000 description 10
- -1 Na salt Chemical class 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 9
- 239000000314 lubricant Substances 0.000 description 7
- 239000003607 modifier Substances 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000005294 ferromagnetic effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000003973 paint Substances 0.000 description 6
- YCPXWRQRBFJBPZ-UHFFFAOYSA-N 5-sulfosalicylic acid Chemical class OC(=O)C1=CC(S(O)(=O)=O)=CC=C1O YCPXWRQRBFJBPZ-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 235000021360 Myristic acid Nutrition 0.000 description 3
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
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- ZQPPMHVWECSIRJ-MDZDMXLPSA-N elaidic acid Chemical compound CCCCCCCC\C=C\CCCCCCCC(O)=O ZQPPMHVWECSIRJ-MDZDMXLPSA-N 0.000 description 3
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- WQEPLUUGTLDZJY-UHFFFAOYSA-N pentadecanoic acid Chemical compound CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 2
- WNKQDGLSQUASME-UHFFFAOYSA-N 4-sulfophthalic acid Chemical compound OC(=O)C1=CC=C(S(O)(=O)=O)C=C1C(O)=O WNKQDGLSQUASME-UHFFFAOYSA-N 0.000 description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 229910015189 FeOx Inorganic materials 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical group 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- YZXBAPSDXZZRGB-DOFZRALJSA-N arachidonic acid Chemical compound CCCCC\C=C/C\C=C/C\C=C/C\C=C/CCCC(O)=O YZXBAPSDXZZRGB-DOFZRALJSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229940090961 chromium dioxide Drugs 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
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- GHVNFZFCNZKVNT-UHFFFAOYSA-N decanoic acid Chemical compound CCCCCCCCCC(O)=O GHVNFZFCNZKVNT-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- KEMQGTRYUADPNZ-UHFFFAOYSA-N heptadecanoic acid Chemical compound CCCCCCCCCCCCCCCCC(O)=O KEMQGTRYUADPNZ-UHFFFAOYSA-N 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 125000005395 methacrylic acid group Chemical group 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- ISYWECDDZWTKFF-UHFFFAOYSA-N nonadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCCC(O)=O ISYWECDDZWTKFF-UHFFFAOYSA-N 0.000 description 2
- UTOPWMOLSKOLTQ-UHFFFAOYSA-N octacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O UTOPWMOLSKOLTQ-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical group OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 description 2
- RGTIBVZDHOMOKC-UHFFFAOYSA-N stearolic acid Chemical compound CCCCCCCCC#CCCCCCCCC(O)=O RGTIBVZDHOMOKC-UHFFFAOYSA-N 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- SZHOJFHSIKHZHA-UHFFFAOYSA-N tridecanoic acid Chemical compound CCCCCCCCCCCCC(O)=O SZHOJFHSIKHZHA-UHFFFAOYSA-N 0.000 description 2
- ZDPHROOEEOARMN-UHFFFAOYSA-N undecanoic acid Chemical compound CCCCCCCCCCC(O)=O ZDPHROOEEOARMN-UHFFFAOYSA-N 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
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- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- SZIFAVKTNFCBPC-UHFFFAOYSA-N 2-chloroethanol Chemical compound OCCCl SZIFAVKTNFCBPC-UHFFFAOYSA-N 0.000 description 1
- RHLPAVIBWYPLRV-UHFFFAOYSA-N 2-hydroxy-4-sulfobenzoic acid Chemical compound OC(=O)C1=CC=C(S(O)(=O)=O)C=C1O RHLPAVIBWYPLRV-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
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- 229910020630 Co Ni Inorganic materials 0.000 description 1
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- 229910020674 Co—B Inorganic materials 0.000 description 1
- 229910020516 Co—V Inorganic materials 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
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- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 1
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- 239000010419 fine particle Substances 0.000 description 1
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- 229910052736 halogen Inorganic materials 0.000 description 1
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
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- 229910001337 iron nitride Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- 229910001234 light alloy Inorganic materials 0.000 description 1
- 229960004232 linoleic acid Drugs 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- JARIJYUQOKFVAJ-UHFFFAOYSA-M sodium;4-carboxy-2-sulfobenzoate Chemical compound [Na+].OC(=O)C1=CC=C(C([O-])=O)C(S(O)(=O)=O)=C1 JARIJYUQOKFVAJ-UHFFFAOYSA-M 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- RMPQIFXEQFYSEM-UHFFFAOYSA-N triazanium;4-sulfonatophthalate Chemical compound [NH4+].[NH4+].[NH4+].[O-]C(=O)C1=CC=C(S([O-])(=O)=O)C=C1C([O-])=O RMPQIFXEQFYSEM-UHFFFAOYSA-N 0.000 description 1
- NUBZKXFFIDEZKG-UHFFFAOYSA-K trisodium;5-sulfonatobenzene-1,3-dicarboxylate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)C1=CC(C([O-])=O)=CC(S([O-])(=O)=O)=C1 NUBZKXFFIDEZKG-UHFFFAOYSA-K 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁気テープ等の磁気記録媒体に関するもので
あり、特に磁性粉末の分散性や磁性層の耐久性の改善を
図った磁気記録媒体に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic recording medium such as a magnetic tape, and in particular to a magnetic recording medium with improved dispersibility of magnetic powder and durability of a magnetic layer. It is related to.
本発明は、非磁性支持体上に磁性粉末と結合剤とを主体
とする磁性層を有してなる磁気記録媒体において、前記
磁性層中にスルホフタル酸又はその塩もしくはスルホサ
リチル酸又はその塩を含有させることにより、磁性粉末
の分散性や磁性層の耐久性の向上が図られた磁気記録媒
体を提供しようとするものである。The present invention provides a magnetic recording medium comprising a magnetic layer mainly composed of magnetic powder and a binder on a non-magnetic support, wherein the magnetic layer contains sulfophthalic acid or a salt thereof or sulfosalicylic acid or a salt thereof. By doing so, it is an attempt to provide a magnetic recording medium in which the dispersibility of the magnetic powder and the durability of the magnetic layer are improved.
磁気記録媒体は、年々高密度記録化の方向に向かってい
る。このような状況の中、磁性層においては極めて微細
な粒子径を有したｉｆｆ性わ）末を結合剤樹脂中に高度
に分散させ、ミル■変換特性を向上させると同時に磁性
塗膜の耐久性を向上させることが要求されている。Magnetic recording media are moving toward higher density recording year by year. Under these circumstances, in the magnetic layer, IF powder with extremely fine particle size is highly dispersed in the binder resin to improve the mill conversion characteristics and at the same time improve the durability of the magnetic coating. is required to improve.
すなわち、上記磁気記録媒体にあっては、磁性層に含有
される磁性粉末を如何に良好に塗料中に分散させるか、
如何に良好に結合剤と結合させるか、あるいはζｆｌ性
塗膜の潤滑性を如何に向上させるかが非常に重要な課題
となる。That is, in the above magnetic recording medium, how well the magnetic powder contained in the magnetic layer is dispersed in the paint;
A very important issue is how to bond well with the binder or how to improve the lubricity of the ζfl coating film.
従来上記要求を満足する方法として、例えば磁性Ｑ料中
にいわゆる分散剤（例えば界面活性剤）を添加して、該
界面活性剤の有する親水基と磁性粉末の親水基とを結合
させ、さらに該界面活性剤の有する親油基と結合剤中の
親油基とを結合させることにより磁性粉末と結合剤とを
結合させ、耐久性の向上や磁性粉末の分散性の向上を図
ることが提案されている。しかしながら、この方法では
分散剤の親油基に極性がないため結合剤との結合力が非
常に弱く界面補強機能が充分に発揮されない。また、界
面補強機能を発揮させようとして分散剤を過剰にいれた
場合、結合剤を可塑化したり、分散剤が塗膜表面に析出
したりして塗膜の耐久性を著しく欠くものとなっている
。Conventionally, as a method to satisfy the above requirements, for example, a so-called dispersant (for example, a surfactant) is added to the magnetic Q material, and the hydrophilic group of the surfactant and the hydrophilic group of the magnetic powder are bonded. It has been proposed to bond the magnetic powder and the binder by bonding the lipophilic group of the surfactant and the lipophilic group in the binder to improve durability and dispersibility of the magnetic powder. ing. However, in this method, since the lipophilic group of the dispersant has no polarity, the bonding force with the binder is very weak, and the interface reinforcing function is not fully exhibited. Additionally, if an excessive amount of dispersant is added in order to exert its interface reinforcing function, the binder may become plasticized or the dispersant may precipitate on the surface of the coating film, resulting in a significant lack of durability of the coating film. There is.
また、結合剤に極性基を導入する方法が提案され、結合
剤に高分子としての機能と分散剤、界面補強剤としての
機能を合わせ持たせる技術が提案されている。しかしな
がら、上述のように結合剤中に極性基を導入し、これに
より磁性粉末との界面補強を図ろうとした場合に、極性
基の親木基団が結合剤の高分子としての機能からくる立
体障害で充分に磁性粉末表面の親水基と吸着することが
できず分散性の劣化を招いたり、また塗料中に耐久性向
上等の目的から添加した長鎖アルキル基を有する化合物
や脂肪酸等が存在した場合に、これらが優先的に磁性粉
末に吸着してしまい、分散機能を有する結合剤の吸着を
妨げ磁性粉末の分散性が劣化する等の問題が生ずる。In addition, a method of introducing a polar group into a binder has been proposed, and a technique has been proposed in which the binder has the functions of a polymer, a dispersant, and an interface reinforcing agent. However, when attempting to introduce polar groups into the binder as described above and thereby reinforcing the interface with the magnetic powder, the parent group of the polar groups becomes sterile due to the function of the binder as a polymer. Due to obstacles, the magnetic powder cannot sufficiently adsorb to the hydrophilic groups on the surface of the magnetic powder, resulting in deterioration of dispersibility.Also, there are compounds with long-chain alkyl groups, fatty acids, etc. added to the paint for the purpose of improving durability. In this case, these particles are preferentially adsorbed to the magnetic powder, which hinders the adsorption of the binder having a dispersion function, resulting in problems such as deterioration of the dispersibility of the magnetic powder.
上述のように磁気記録媒体においては、各種の問題点が
内在している。As mentioned above, magnetic recording media have various problems inherent in them.
そこで、本発明は上述の従来の実情に鑑みて提案された
ものであり、磁性粉末の分散性や磁性層の耐久性に優れ
た磁気記録媒体を提供することを目的とするものである
。Therefore, the present invention has been proposed in view of the above-mentioned conventional situation, and an object of the present invention is to provide a magnetic recording medium with excellent dispersibility of magnetic powder and durability of a magnetic layer.
本発明者等は上述の目的を達成せんものと鋭意研究の結
果、磁性層中にスルホフタル酸又はその塩もしくはスル
ホサリチル酸又はその塩を含有させることにより、磁性
粉末の分散性や磁性層の耐久性が著しく向上し、上述の
各種問題点が改善されるとの知見を得るに至った。As a result of intensive research, the present inventors have found that the above object can be achieved by incorporating sulfophthalic acid or its salt or sulfosalicylic acid or its salt into the magnetic layer, thereby improving the dispersibility of the magnetic powder and the durability of the magnetic layer. We have come to the conclusion that the above-mentioned various problems can be improved.
本発明は上述の知見に基づきなされたものであって、第
１図に示すように、非磁性支持体（１）上に磁性粉末と
結合剤とを主体とする磁性層（２）を有してなる磁気記
録媒体において、前記磁性層（２）はスルホフタル酸又
はその塩、あるいはスルホサリチル酸又はその塩を含有
することを特徴とするものである。The present invention has been made based on the above-mentioned knowledge, and as shown in FIG. 1, has a magnetic layer (2) mainly composed of magnetic powder and a binder on a non-magnetic support (1). The magnetic recording medium is characterized in that the magnetic layer (2) contains sulfophthalic acid or a salt thereof, or sulfosalicylic acid or a salt thereof.
なお本発明は、第２図に示すように、非磁性支持体（１
１）の一方の面に磁性１（１２）を、他方の面に非磁性
粉末と結合剤とを主体とするバ・ツクコート層（１３）
を有してなる磁気記録媒体に適用してもよい。In addition, the present invention, as shown in FIG.
1) with magnetic 1 (12) on one side and a back coat layer (13) mainly consisting of non-magnetic powder and binder on the other side.
It may be applied to a magnetic recording medium having.
ここで、磁性層が含有するスルホフタル酸とは、フタル
酸、イソフタル酸、テレフタル酸において、ベンゼン環
の何れかの位置にスルホン酸基が導入されたものである
また、その塩とは分子中のカルボキシル基もしくはスル
ホン酸基の何れか少なくとも一つが塩（例えばＮａ塩、
に塩、アンモニウム塩）の形になっているものである。Here, the sulfophthalic acid contained in the magnetic layer refers to phthalic acid, isophthalic acid, and terephthalic acid in which a sulfonic acid group is introduced at any position of the benzene ring. At least one of the carboxyl group or the sulfonic acid group is a salt (e.g. Na salt,
It is in the form of salt, ammonium salt).
これらスルホフタル酸またはその塩を具体的に示すと、
例えば■ ３−スルホフタル酸
■ ４−スルホフタル酸
■ ４−スルホフタル酸トリアンモニウム塩■ ２−ス
ルホテレフタル酸モノナトリウム塩■ ５−スルホイソ
フタル酸ナトリウム塩等が挙げられる。Specifically, these sulfophthalic acids or their salts are:
Examples include: ■ 3-sulfophthalic acid ■ 4-sulfophthalic acid ■ 4-sulfophthalic acid triammonium salt ■ 2-sulfoterephthalic acid monosodium salt ■ 5-sulfoisophthalic acid sodium salt.
一方、磁性層が含有するスルホサリチル酸とは、サリチ
ル酸のベンゼン環の何れかの位置にスルボン酸基が導入
されたものである。また、その塩とは分子中のカルボキ
シル基もしくはスルホン酸基の何れか少なくとも一つが
塩（例えばＮａ塩、に塩。On the other hand, the sulfosalicylic acid contained in the magnetic layer is salicylic acid with a sulfonic acid group introduced at any position of the benzene ring. In addition, the salt refers to a salt in which at least one of the carboxyl group or sulfonic acid group in the molecule is a salt (for example, Na salt, etc.).
アンモニウム塩）の形になっているものである。ammonium salt).
これらスルホサリチル酸またはその塩を具体的に示すと
、例えば
（以下余白）
■ ４−スルホサリチル酸
■ ５−スルホサリチル酸
■ ４−スルホサリチル酸ナトリウム塩■ ５−スルホ
サリチル酸ナトリウム塩等が挙げられる。Specific examples of these sulfosalicylic acids or salts thereof include (see below in the margin) (1) 4-sulfosalicylic acid (2) 5-sulfosalicylic acid (2) 4-sulfosalicylic acid sodium salt (4) 5-sulfosalicylic acid sodium salt.
上記スルホフタル酸又はその塩もしくはスルホサリチル
酸又はその塩を非磁性粉末と結合剤の間に介する方法と
しては、磁性層塗料を作製する際に添加する方法、また
磁性粉末をあらかじめ上記スルホフタル酸又はその塩も
しくはスルホサリチル酸又はその塩等で表面処理する方
法がある。上記スルホフタル酸又はその塩もしくはスル
ホサリチル酸又はその塩の添加量としては磁性層におい
ては、磁性粉末１００重量部に対して０．１〜５重量部
（０，１〜５ＰＨＰと表す。）の範囲内であることが好
ましい。上記スルホフタル酸又はその塩もしくはスルホ
サリチル酸又はその塩等の添加量がこの範囲より少ない
場合にはこれら化合物を添加した効果が期待できず、ま
たこれら化合物の添加量がこの範囲より多い場合には塗
膜が酸性に傾き塗膜の耐蝕性の劣化を招くことになる。The above-mentioned sulfophthalic acid or its salt or sulfosalicylic acid or its salt may be interposed between the non-magnetic powder and the binder by adding it at the time of preparing the magnetic layer paint, or by adding the above-mentioned sulfophthalic acid or its salt in advance. Alternatively, there is a method of surface treatment with sulfosalicylic acid or its salt. The amount of the sulfophthalic acid or its salt or sulfosalicylic acid or its salt added in the magnetic layer is within the range of 0.1 to 5 parts by weight (expressed as 0.1 to 5 PHP) per 100 parts by weight of the magnetic powder. It is preferable that If the amount of the above-mentioned sulfophthalic acid or its salt or sulfosalicylic acid or its salt is less than this range, the effect of adding these compounds cannot be expected, and if the amount of these compounds added is more than this range, the coating The film becomes acidic and the corrosion resistance of the coating film deteriorates.
一方、磁性層を構成する結合剤としては、通常この種の
磁気記録媒体の結合剤として使用される結合剤樹脂であ
ればいかなるものも使用可能であるが、特に本発明にお
いては、分子中に中性または塩基性の極性基を有する樹
脂が含有された結合剤が使用可能である。したがって、
例えば−Ｆ記中性または塩基性の極性基が導入された樹
脂をｍ独で結合剤とＵ２てもよいし、上記中性または塩
基性の極性基が導入された樹脂と極性基が導入されてい
ない樹脂とを組み合わせた結合剤や中性または塩基性の
極性基が同時に導入された樹脂からなる結合剤同士の組
み合わせ等いずれの形態を示す結合剤も使用することが
できる。なお、上記中性または塩基性の極性基が導入さ
れた樹脂と極性基が導入されていない樹脂とを組み合わ
せた結合剤の場合には、極性基が導入された樹脂が少な
くとも１０％以上の割合で組み合わされていることが必
要である。On the other hand, as the binder constituting the magnetic layer, any binder resin that is normally used as a binder for this type of magnetic recording medium can be used. A binder containing a resin having a neutral or basic polar group can be used. therefore,
For example, the resin introduced with a neutral or basic polar group described in -F may be combined with a binder alone, or the resin introduced with the above neutral or basic polar group may be combined with a polar group. Any type of binder can be used, such as a binder in combination with a resin that does not have a neutral or basic polar group, or a combination of binders made of a resin in which a neutral or basic polar group is introduced at the same time. In addition, in the case of a binder that is a combination of a resin into which a neutral or basic polar group has been introduced and a resin into which no polar group has been introduced, the proportion of the resin into which a polar group has been introduced is at least 10%. It is necessary that the
かかる樹脂としては、例えば塩化ビニル−酢酸ビニル共
重合体、塩化ビニル−酢酸ビニル−ビニルアルコール共
重合体、塩化ビニル−酢酸ビニル−マレイン酸共重合体
、塩化ビニル−塩化ビニリデン共重合体、塩化ビニル−
アクリロニトリル共重合体、アクリル酸エステル−アク
リロニトリル共重合体、アクリル酸エステル−塩化ビニ
リデン共重合体、メタクリル酸エステル−塩化ビニリデ
ン共重合体、メタクリル酸エステル−スチレン共重合体
、熱可望性ポリウレタン樹脂、ポリ弗化ビニル、塩化ビ
ニリデン−アクリロニトリル共重合体、ブタジェン−ア
クリロニトリル共重合体、アクリロニトリル−ブタジェ
ン−メタクリル酸共重合体、ポリビニルブチラール、セ
ルロース誘導体。Examples of such resins include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-vinylidene chloride copolymer, and vinyl chloride. −
Acrylonitrile copolymer, acrylic ester-acrylonitrile copolymer, acrylic ester-vinylidene chloride copolymer, methacrylic ester-vinylidene chloride copolymer, methacrylic ester-styrene copolymer, thermoplastic polyurethane resin, Polyvinyl fluoride, vinylidene chloride-acrylonitrile copolymer, butadiene-acrylonitrile copolymer, acrylonitrile-butadiene-methacrylic acid copolymer, polyvinyl butyral, cellulose derivative.
スチレン−ブタジェン共重合体、ポリエステル樹脂、フ
ェノール樹脂、エポキシ樹脂、熱硬化性ポリウレタン樹
脂、尿素樹脂、メラミン樹脂、アルキド樹脂、尿素−ホ
ルムアルデヒド樹脂またはこれらの混合物等の結合剤樹
脂が挙げられる。Examples include binder resins such as styrene-butadiene copolymers, polyester resins, phenolic resins, epoxy resins, thermosetting polyurethane resins, urea resins, melamine resins, alkyd resins, urea-formaldehyde resins, or mixtures thereof.
これら結合剤樹脂が含有している中性または塩基性の極
性基としては、−５０３Ｍ、 −０・ｓｏ、Ｍ、 −Ｃ
ＯＯＭ。The neutral or basic polar groups contained in these binder resins include -503M, -0・so, M, -C
OOM.
−Ｐ（０阿”）ｚ、−Ｎｈ、 −ＮＲＨ，−ＮＲｉ、
−Ｎ’Ｒ３・Ｘ−（但し、Ｍは水素原子、アルカリ金属
原子または各種のアンモニウムを、Ｍ゛は水素原子、ア
ルカリ金属原子または炭化水素基を表し、Ｒはアルキル
基やアリール基等の炭化水素基を、Ｘ−はハロゲン等の
陰イオンを表す、）やアミノカルボン酸残基等が挙げら
れる。なお、結合剤樹脂中に含まれる極性基の含有蟹と
しては０．００１ ｍ ｍｏｌ／ｇ ” １． Ｏｍ
ｍｏｌ／ｇの範囲内であることが好ましし・。-P(0a")z, -Nh, -NRH, -NRi,
-N'R3・X- (However, M represents a hydrogen atom, an alkali metal atom, or various ammonium, M゛ represents a hydrogen atom, an alkali metal atom, or a hydrocarbon group, and R represents a carbonized group such as an alkyl group or an aryl group. Examples include a hydrogen group, X- represents an anion such as a halogen), an aminocarboxylic acid residue, and the like. In addition, the polar group-containing crab contained in the binder resin is 0.001 m mol/g "1. Om
It is preferably within the range of mol/g.
本発明に係る磁気記録媒体は、上述した結合剤中に変性
剤により変性された磁性粉末を分散させて得られる磁性
塗料を非磁性支持体上に形成することにより得られるも
のである。The magnetic recording medium according to the present invention is obtained by dispersing magnetic powder modified with a modifier in the above-mentioned binder and forming a magnetic coating material on a non-magnetic support.
ここで、上記磁性粉末としては、強磁性酸化鉄粒子、強
磁性二酸化クロム、強磁性合金粉末、六方晶系バリウム
フェライト微粒子、窒化鉄等が挙げられる。Here, examples of the magnetic powder include ferromagnetic iron oxide particles, ferromagnetic chromium dioxide, ferromagnetic alloy powder, hexagonal barium ferrite particles, iron nitride, and the like.
上記強磁性酸化鉄粒子としては、一般式ＦｅＯｘで表し
た場合、Ｘの値が１．３３≦Ｘ≦１．５０の範囲にある
もの、即ちマグネタイト（γ−Ｆｅ、Ｏ，。The above-mentioned ferromagnetic iron oxide particles are those whose X value is in the range of 1.33≦X≦1.50 when expressed by the general formula FeOx, that is, magnetite (γ-Fe, O,).
Ｘ＝１．５０）、マグネタイト（ＦｅｓＯａ 、 Ｘ
＝ １．３３）及びこれらの固溶体（ＦｅＯｘ、１．
３３＜Ｘ＜１．５０）である、さらに、これら強磁性酸
化鉄には、抗磁力をあげる目的でコバルトを添加しても
よい、コバルト含有酸化鉄には、大別してドープ型と被
着型の２種類がある。X=1.50), magnetite (FesOa,
= 1.33) and their solid solutions (FeOx, 1.
33 < There are two types.
上記強磁性二酸化クロムとしては、ＣｒＯオあるいはこ
れらに抗磁力を向上させる目的でＲｕ。The above-mentioned ferromagnetic chromium dioxide may include CrO or Ru for the purpose of improving coercive force.
３ｎ、 Ｔｅ、Ｓｂ、Ｆｅ、Ｔｉ、Ｖ、Ｍｎ等の少なく
とも一種類を添加したものを使用できる。3n, Te, Sb, Fe, Ti, V, Mn, etc. can be used.
強磁性合金粉末としては、Ｆｅ、Ｃｏ、 Ｎｉ。Examples of the ferromagnetic alloy powder include Fe, Co, and Ni.
Ｆｅ−Ｇｏ、）”ｅ−Ｎｉ、Ｆｅ−Ｃｏ−Ｎｉ、Ｃ。Fe-Go, )”e-Ni, Fe-Co-Ni, C.
−Ｎｉ、Ｆｅ−Ｃｏ−Ｂ、Ｆｅ−Ｃｏ−Ｃｒ−Ｂ。-Ni, Fe-Co-B, Fe-Co-Cr-B.
Ｍｎ−Ｂ ｉ、Ｍｎ−Ａ３．Ｆｅ−Ｃｏ−Ｖ等が使用で
き、またこれらに種々の特性を改善する目的でＡｊ！、
Ｓｉ、Ｔｉ、Ｃｒ、Ｍｎ、Ｃｕ、Ｚｎ等の金属成分を添
加してもよい。Mn-B i, Mn-A3. Fe-Co-V, etc. can be used, and Aj! ,
Metal components such as Si, Ti, Cr, Mn, Cu, and Zn may be added.
本発明の磁気記録媒体において磁性層は、例えば上述の
磁性粉末を上述した結合剤中に分散し、有機溶剤に溶か
して調製される磁性塗料を非磁性支持体の表面に塗布し
て形成すればよい。In the magnetic recording medium of the present invention, the magnetic layer may be formed, for example, by dispersing the above-mentioned magnetic powder in the above-mentioned binder and applying a magnetic paint prepared by dissolving it in an organic solvent onto the surface of the non-magnetic support. good.
上記磁性層を塗布形成する際に使用する有機溶剤として
は、例えばアセトン、メチルエチルケトン、メチルイソ
ブチルケトン、シクロヘキサノン等のケトン系、酢酸メ
チル、酢酸エチル、酢酸ブチル、乳酸エチル、酢酸グリ
コールモノエチルエーテル等のエステル系、グリコール
ジメチルエーテル、グリコールモノエチルエーテル、ジ
オキサン等のグリコールエーテル系、ベンゼン、トルエ
ン、キシレン等の芳香族炭化水素、ヘキサン、ヘプタン
等の脂肪族炭化水素、メチレンクロライド。Examples of organic solvents used in coating and forming the magnetic layer include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, and acetic acid glycol monoethyl ether. Ester types, glycol ether types such as glycol dimethyl ether, glycol monoethyl ether, and dioxane, aromatic hydrocarbons such as benzene, toluene, and xylene, aliphatic hydrocarbons such as hexane and heptane, and methylene chloride.
エチレンクロライド、四塩化炭素、クロロホルム。Ethylene chloride, carbon tetrachloride, chloroform.
エチレンクロルヒドリン、ジクロルベンゼン等の塩素化
炭化水素等が挙げられる。Examples include chlorinated hydrocarbons such as ethylene chlorohydrin and dichlorobenzene.
上述した磁性層中には、上述した結合剤や磁性粉末の他
に通常磁気記録媒体の磁性層を構成する添加剤として使
用される分散剤、研磨剤、帯電防止剤、防錆剤等が加え
られてもよい、これらのものを添加する場合には磁性層
中にスルホフタル酸量たはその塩もしくはスルホサリチ
ル酸またはその塩や中性または塩基性の極性基を導入し
た効果を阻害しない範囲内で添加することが好ましい。In addition to the above-mentioned binder and magnetic powder, the above-mentioned magnetic layer contains a dispersant, an abrasive, an antistatic agent, a rust preventive agent, etc., which are usually used as additives constituting the magnetic layer of a magnetic recording medium. When these substances are added, the amount of sulfophthalic acid or its salt, or sulfosalicylic acid or its salt, or the effect of introducing a neutral or basic polar group into the magnetic layer is not inhibited. It is preferable to add.
また、磁性層に潤滑性を付与し磁性層の耐久性を向上さ
せる目的で潤滑剤を使用してもよい。上記潤滑剤を使用
する場合には、該潤滑剤は磁性層内に内添してもよく、
また磁性層上にトップコートしてもよい、特に潤滑剤と
して以下に示すような脂肪酸を使用する場合には、該脂
肪酸の構造中に有するアルキル基が非極性であるため、
結合剤との結合力が弱い一方、例えば磁性粉末の表面が
塩基性であった場合には磁性粉末表面に該脂肪酸が優先
的に吸着することとなり塗膜の耐久性を著しく劣化させ
ている等の種々の弊害を招くため、トップコートとする
ことが好ましい。なお、トップコートする場合にはその
コーテイング量は１〜５００■／ｄの範囲とすることが
好ましい。上記潤滑剤として使用される脂肪酸としては
通常炭素数１０以上の脂肪酸が用いられる。該脂肪酸は
通常この種の磁気記録媒体に用いられるものであればい
ずれのものであってもよく、飽和脂肪酸、不飽和脂肪酸
等が挙げられる。上記脂肪酸を具体的に示すと、例えば
カプリン酸、ウンデシル酸、ラウリン酸、トリデシル酸
、ミリスチン酸、ペンタデシル酸、パルミチン酸、ヘプ
タデシル酸、ステアリン酸、ノナデカン酸、アラキン酸
、ヘヘン酸、リグノセリン酸、セロチン酸、ヘプタコン
酸、モンタン酸、メリシン酸、ラフセル酸、ウンデシル
酸、オレイン酸、エライジン酸、セトレイン酸、エルカ
酸、ブラシジン酸、リノール酸、リルン酸、アラキドン
酸、ステアロール酸等が挙げられる。Further, a lubricant may be used for the purpose of imparting lubricity to the magnetic layer and improving the durability of the magnetic layer. When using the above lubricant, the lubricant may be added internally within the magnetic layer,
In addition, a top coating may be applied on the magnetic layer. In particular, when using the following fatty acids as a lubricant, since the alkyl group in the structure of the fatty acid is non-polar,
While the bonding force with the binder is weak, for example, if the surface of the magnetic powder is basic, the fatty acid will be preferentially adsorbed to the surface of the magnetic powder, significantly deteriorating the durability of the coating film. It is preferable to use it as a top coat because it causes various adverse effects. In addition, when a top coat is applied, the coating amount is preferably in the range of 1 to 500 .mu./d. The fatty acid used as the lubricant is usually a fatty acid having 10 or more carbon atoms. The fatty acid may be any fatty acid that is normally used in this type of magnetic recording medium, and includes saturated fatty acids, unsaturated fatty acids, and the like. Specific examples of the above fatty acids include capric acid, undecylic acid, lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachidic acid, hehenic acid, lignoceric acid, and serotinic acid. Acids include heptaconic acid, montanic acid, mellisic acid, lafcelic acid, undecyl acid, oleic acid, elaidic acid, cetoleic acid, erucic acid, brassic acid, linoleic acid, linolic acid, arachidonic acid, stearolic acid, and the like.
上述のような磁性層を形成する非磁性支持体の素材とし
ては、通常この種の磁気記録媒体に使用されるものであ
れば如何なるものであってもよく、例えばポリエチレン
テレフタレート等のポリエステル類、ポリエチレン、ポ
リプロピレン等のポリオレフィン類、セルローストリア
セテート、セルロースダイアセテートセルロースアセテ
ートブチレート等のセルロース誘導体、ポリ塩化ビニル
。The material for the nonmagnetic support forming the magnetic layer as described above may be any material that is normally used in this type of magnetic recording medium, such as polyesters such as polyethylene terephthalate, polyethylene, etc. , polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate, cellulose diacetate, cellulose acetate butyrate, and polyvinyl chloride.
ポリ塩化ビニリデン等のビニル系樹脂、ポリカーボネー
ト、ポリイミド、ポリアミド、ポリアミドイミド、ポリ
フェニレンサルファイド等のプラスチック、紙、アルミ
ニウム、銅等の金属、アルミニウム合金、チタン合金等
の軽合金、セラミックス、単結晶シリコン等が挙げられ
る。この非磁性支持体の形態としては、フィルム、テー
プ、ソートディスク、カード、ドラム等のいずれでも良
い。Vinyl resins such as polyvinylidene chloride, plastics such as polycarbonate, polyimide, polyamide, polyamideimide, polyphenylene sulfide, paper, metals such as aluminum and copper, light alloys such as aluminum alloys and titanium alloys, ceramics, single crystal silicon, etc. Can be mentioned. The nonmagnetic support may be in any form such as a film, tape, sorting disk, card, or drum.
なお、本発明に係る磁気記録媒体においては、第２図に
示すように、磁性層（１２）形成面とは反対面にバンク
コート層（１３）を設けてもよい。この場合にはバンク
コート層（Ｉ３）の構成を磁性層（１２）と同様に非磁
性粉末の変性剤としてスルホフタル酸またはその塩もし
くはスルホサリチル酸またはその塩を使用し、さらにバ
ンクコート層（１３）の結合剤として分子中に中性また
は塩基性極性基を有する樹脂を使用する構成とすること
により、非常に優れた特性を有するバックコート層（１
３）とすることができる。In the magnetic recording medium according to the present invention, as shown in FIG. 2, a bank coat layer (13) may be provided on the surface opposite to the surface on which the magnetic layer (12) is formed. In this case, the structure of the bank coat layer (I3) is similar to that of the magnetic layer (12), using sulfophthalic acid or its salt or sulfosalicylic acid or its salt as a modifier for the non-magnetic powder, and further forming the bank coat layer (13). By using a resin having a neutral or basic polar group in the molecule as a binder, the back coat layer (1
3).
磁気記録媒体を構成する磁性層中に含有されるスルホフ
タル酸またはその塩もしくはスルホサリチル酸またはそ
の塩は、その特性から磁性粉末に優先的に吸着し、例え
ば脂肪酸のような潤滑剤が磁性粉末に優先的に吸着しな
いよう変性剤として機能する。また、磁性層を構成する
結合剤とじて含有される分子中に中性または塩基性極性
基を有する樹脂は、磁性粉末の変性剤として使用されて
いるスルホフタル酸またはその塩もしくはスルホサリチ
ル酸またはその塩との間で相互作用を発現し非常に強固
且つ良好な結合を生ずる。このようにスルホフタル酸ま
たはその塩もしくはスルホサリチル酸またはその塩と分
子中に中性または塩基性極性基を有する樹脂との良好な
相互作用により磁性粉末の分散性及び磁性塗膜の界面補
強の向上が達成される。Sulfophthalic acid or its salt or sulfosalicylic acid or its salt contained in the magnetic layer constituting the magnetic recording medium is preferentially adsorbed to the magnetic powder due to its characteristics, and lubricants such as fatty acids are preferentially adsorbed to the magnetic powder. Functions as a denaturing agent to prevent adsorption. In addition, the resin having a neutral or basic polar group in the molecule contained together with the binder constituting the magnetic layer is sulfophthalic acid or its salt, or sulfosalicylic acid or its salt, which is used as a modifier for magnetic powder. It interacts with the molecule and produces a very strong and good bond. In this way, the good interaction between sulfophthalic acid or its salts or sulfosalicylic acid or its salts and the resin having a neutral or basic polar group in the molecule improves the dispersibility of the magnetic powder and the interface reinforcement of the magnetic coating. achieved.
以下、本発明の具体的な実施例について説明するが、本
発明がこの実施例に限定さるものではないことは言うま
でもない。Hereinafter, specific examples of the present invention will be described, but it goes without saying that the present invention is not limited to these examples.
去施班上
Ｃｏ被着ｒ −Ｆｅｚ０３ １２重
量部（比表面積３４Ｍ／ｇ、 ｐＦ＋９．０）ウレタン
系樹脂 ３重量部（−Ｃ００１
１基０．０５１１１ｎｏｔ／ｇ含有）溶剤（メチルエチ
ルケトン） ２６．７重量部変性剤（４−スル
ホフタル酸’３ ０．２４重量部（２ＰＨＰ）上記組
成物をボールミルにて２４時間混合してから硬化側（デ
スモジュールＬ）を５重量部添加した後、２μフイルタ
ーを通して取り出し、この磁性塗料をポリエチレンテレ
フタレートフィルム上に乾燥後の厚みが６μｍとなるよ
うに塗布し、２００００ｅの条件下にて磁場配向をした
後、乾燥させ巻取った。これをカレンダー処理し、さら
に６０℃で２０時間硬化反応を行った。その後、磁性す
膜上にオレイン酸のフレオン溶液を１０ｋｇ／ ｎ（と
なるようにコーティングした後、１／２インチ幅に裁断
しサンプルテープを作製した。Co coating on removed area -Fez03 12 parts by weight (specific surface area 34M/g, pF+9.0) Urethane resin 3 parts by weight (-C001
1 unit containing 0.05111not/g) Solvent (methyl ethyl ketone) 26.7 parts by weight Modifier (4-sulfophthalic acid '3 0.24 parts by weight (2 PHP) The above composition was mixed in a ball mill for 24 hours, and then the curing side After adding 5 parts by weight of (Desmodur L), it was taken out through a 2μ filter, and this magnetic paint was applied onto a polyethylene terephthalate film so that the thickness after drying would be 6μm, and it was magnetically oriented under the condition of 20,000e. After that, it was dried and rolled up. This was calendered and further subjected to a curing reaction at 60°C for 20 hours. Thereafter, a Freon solution of oleic acid was coated on the magnetic film at a rate of 10 kg/n. A sample tape was prepared by cutting the tape into 1/2 inch width.
劃 ２〜゛１８
実施例１において使用した変性剤及び結合剤中に含有さ
れる極性基を第１表及び第２表に示すように変え、他は
実施例１と同様の方法によりサンプルテープを作製した
。Sections 2 to 18 A sample tape was prepared in the same manner as in Example 1 except that the polar groups contained in the modifier and binder used in Example 1 were changed as shown in Tables 1 and 2. Created.
止較史上ニル較桝主
実施例１において使用した変性剤を使用せず、結合剤中
に含有される極性基を第１表及び第２表に示すように変
え、他は実施例１と同様の方法によりサンプルテープを
作製した。The modification agent used in the main Example 1 was not used, the polar groups contained in the binder were changed as shown in Tables 1 and 2, and the other conditions were the same as in Example 1. A sample tape was prepared using the method described above.
（以下余白）
第１表
第２表
上述のようにして作製した各サンプルテープについてグ
ロス、粉落ち、磁束密度Ｂｍ、角形比Ｒｓ、保磁力Ｈｃ
を測定した。上記グロスは光沢針を用いて入射角７５°
、反射角７５°における反射率を測定した。また、扮落
ちは６０分シャトル１００回走行後のヘッドドラム、ガ
イドピン等への粉落ち量を目視によって観察し、殆ど粉
落ちがないものを０点、粉落ち量が多いものを一５点と
して評価した。さらに６ｎ気特性は２５００ガウスの磁
場で測定したものである。その結果を第３表及び第４表
に示す。(Margin below) Table 1 Table 2 For each sample tape produced as described above, gloss, powder removal, magnetic flux density Bm, squareness ratio Rs, coercive force Hc
was measured. The above gloss uses a glossy needle with an incident angle of 75°.
, the reflectance at a reflection angle of 75° was measured. In addition, for the amount of powder falling off, visually observe the amount of powder falling on the head drum, guide pin, etc. after running the shuttle 100 times for 60 minutes, and score 0 if there is almost no powder falling off, and 15 points if there is a large amount of falling powder. It was evaluated as Furthermore, the 6n characteristics were measured in a magnetic field of 2500 Gauss. The results are shown in Tables 3 and 4.
第３表
第４表
第３表及び第４表より明らかなように、変性剤を添加し
、表面性を中性あるいは酸性にした（イ盈性粉末を使用
した磁気記録媒体にあっては、中性あるいは塩基性の極
性基を導入した結合剤を使用した場合（実施例２．実施
例３．実施例５．実施例６、実施例８．実施例９．実施
例１１．実施例１２、実施例１４．実施例１５．実施例
１７．実施例１８）には、非常に良好な分散性が得られ
、グロスや扮落ち、あるいは各種磁気特性において非常
に良好な結果が得られた。As is clear from Tables 3 and 4, modifiers are added to make the surface properties neutral or acidic (for magnetic recording media using magnetic powder, When using a binder with a neutral or basic polar group introduced (Example 2, Example 3, Example 5, Example 6, Example 8, Example 9, Example 11, Example 12, In Example 14, Example 15, Example 17, and Example 18), very good dispersibility was obtained, and very good results were obtained in terms of gloss, shedding, and various magnetic properties.
これに対して表面性を中性あるいは酸性にした磁性粉末
を使用した磁気記録媒体において、酸性の極性基を導入
した結合剤を使用した場合（実施例１．実施例４．実施
例７．実施例１０．実施例１３、実施例１６）には分散
性が劣化し、グロスやＦＡ落ち、あるいは各種磁気特性
において良好な結果が得られ無かった。また、ブランク
（比較例１〜比較例３）の場合にはその結果が逆になっ
ている。On the other hand, when a binder into which acidic polar groups are introduced is used in a magnetic recording medium using magnetic powder with neutral or acidic surface properties (Example 1, Example 4, Example 7, Implementation). In Example 10, Example 13, and Example 16), the dispersibility deteriorated, and good results were not obtained in terms of gloss, FA drop, or various magnetic properties. Moreover, in the case of blanks (Comparative Examples 1 to 3), the results are reversed.
なお、上述した磁性塗料中に潤滑剤としてミリスチン酸
をＩ ＰＮＰ添加した場合、ミリスチン酸のＩｄ性わ）
末−の吸着量は比較例１〜比較例３ （ブランク）にお
いて８０％であったものが、実施例１〜実施例１８ （
磁性粉末に変性剤を添加した系）にあっては１０〜３０
％程度の吸着量に抑制することができた。これによって
粉落ちが比較例１〜比較例３では−１づつ劣化したのに
対して、実施例１〜実施例１８にあってはわ）落ちの劣
化はみられなかった。In addition, when myristic acid is added as a lubricant to the above-mentioned magnetic paint, the Id property of myristic acid (Id property of myristic acid)
The adsorption amount of powder was 80% in Comparative Examples 1 to 3 (blank), but it was 80% in Examples 1 to 18 (blank).
10 to 30 for magnetic powders containing modifiers)
The amount of adsorption could be suppressed to about 1.9%. As a result, the powder shedding deteriorated by -1 in Comparative Examples 1 to 3, whereas no deterioration in powder shedding was observed in Examples 1 to 18.
また、摩擦係数も比較例１〜比較例３では約０゜３５で
あったのに対して、実施例１〜実施例１８では０．２６
と非常に低い値であり潤滑効果がより発揮されたことが
わかる。Furthermore, the coefficient of friction was approximately 0.35 in Comparative Examples 1 to 3, while it was 0.26 in Examples 1 to 18.
This is a very low value, indicating that the lubrication effect was even more effective.
以上の説明より明らかなように、本発明では磁気記録媒
体を構成する磁性層がスルホフタル酸またはその塩もし
くはスルホサリチル酸またはその塩を含有しているので
、特に中性もしくは塩基性の極性基が導入された結合剤
の間で、良好な相互作用が生し磁性粉末の分散性及び磁
性塗膜の界面補強の向上が達成できる。As is clear from the above explanation, in the present invention, since the magnetic layer constituting the magnetic recording medium contains sulfophthalic acid or a salt thereof or sulfosalicylic acid or a salt thereof, a neutral or basic polar group is particularly introduced. A good interaction occurs between the binders, which improves the dispersibility of the magnetic powder and the interface reinforcement of the magnetic coating.
したがって、耐久性に優れた磁性層を存する磁気記録媒
体を提供することができる。Therefore, a magnetic recording medium including a magnetic layer with excellent durability can be provided.
第１図は本発明を適用した磁気記録媒体の一構成例を示
す概略断面図である。
第２図は本発明を適用した磁気記録媒体の他の構成例を
示す概略断面図である。
１．１１・・・非磁性支持体
２．１２・・・磁性層
１３・・・バックコート層
特許出願人 ソニー株式会社
代理人 弁理士 小泡 晃
同 田村 榮−
同 佐藷 勝
第１図
第２図FIG. 1 is a schematic cross-sectional view showing an example of the configuration of a magnetic recording medium to which the present invention is applied. FIG. 2 is a schematic cross-sectional view showing another example of the configuration of a magnetic recording medium to which the present invention is applied. 1.11...Nonmagnetic support 2.12...Magnetic layer 13...Back coat layer Patent applicant Sony Corporation representative Patent attorney Kodo Kobo, Sakae Tamura - Masaru Sato Figure 1 Figure 2
Claims (2)
る磁性層を有してなる磁気記録媒体において、前記磁性
層はスルホフタル酸又はその塩を含有することを特徴と
する磁気記録媒体。(1) A magnetic recording medium comprising a magnetic layer mainly composed of magnetic powder and a binder on a non-magnetic support, characterized in that the magnetic layer contains sulfophthalic acid or a salt thereof. Medium.
る磁性層を有してなる磁気記録媒体において、前記磁性
層はスルホサリチル酸又はその塩を含有することを特徴
とする磁気記録媒体。(2) A magnetic recording medium comprising a magnetic layer mainly composed of magnetic powder and a binder on a non-magnetic support, characterized in that the magnetic layer contains sulfosalicylic acid or a salt thereof. Medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9909088A JPH01271914A (en) | 1988-04-21 | 1988-04-21 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9909088A JPH01271914A (en) | 1988-04-21 | 1988-04-21 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01271914A true JPH01271914A (en) | 1989-10-31 |
Family
ID=14238194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9909088A Pending JPH01271914A (en) | 1988-04-21 | 1988-04-21 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01271914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH041917A (en) * | 1990-04-19 | 1992-01-07 | Fuji Photo Film Co Ltd | Magnetic recording medium and its production |
-
1988
- 1988-04-21 JP JP9909088A patent/JPH01271914A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH041917A (en) * | 1990-04-19 | 1992-01-07 | Fuji Photo Film Co Ltd | Magnetic recording medium and its production |
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