JPH01194129A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH01194129A JPH01194129A JP1874988A JP1874988A JPH01194129A JP H01194129 A JPH01194129 A JP H01194129A JP 1874988 A JP1874988 A JP 1874988A JP 1874988 A JP1874988 A JP 1874988A JP H01194129 A JPH01194129 A JP H01194129A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- binder
- magnetic
- coat layer
- back coat
- 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 44
- 239000011230 binding agent Substances 0.000 claims abstract description 43
- 239000002253 acid Substances 0.000 claims abstract description 39
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical compound NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000006247 magnetic powder Substances 0.000 claims description 28
- 239000000843 powder Substances 0.000 abstract description 34
- 239000011347 resin Substances 0.000 abstract description 22
- 229920005989 resin Polymers 0.000 abstract description 22
- 239000002270 dispersing agent Substances 0.000 abstract description 10
- 239000000654 additive Substances 0.000 abstract description 9
- 150000007513 acids Chemical class 0.000 abstract description 8
- 230000003014 reinforcing effect Effects 0.000 abstract description 7
- 150000001735 carboxylic acids Chemical class 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000000314 lubricant Substances 0.000 abstract description 5
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 38
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 230000002378 acidificating effect Effects 0.000 description 12
- -1 and lamp plaque Substances 0.000 description 11
- 235000014113 dietary fatty acids Nutrition 0.000 description 11
- 229930195729 fatty acid Natural products 0.000 description 11
- 239000000194 fatty acid Substances 0.000 description 11
- 150000004665 fatty acids Chemical class 0.000 description 11
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 9
- 239000003973 paint Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- 125000001931 aliphatic group Chemical group 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 150000001991 dicarboxylic acids Chemical class 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 4
- ZDPHROOEEOARMN-UHFFFAOYSA-N undecanoic acid Chemical compound CCCCCCCCCCC(O)=O ZDPHROOEEOARMN-UHFFFAOYSA-N 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-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
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 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 2
- UIAFKZKHHVMJGS-UHFFFAOYSA-N 2,4-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1O UIAFKZKHHVMJGS-UHFFFAOYSA-N 0.000 description 2
- WXTMDXOMEHJXQO-UHFFFAOYSA-N 2,5-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC(O)=CC=C1O WXTMDXOMEHJXQO-UHFFFAOYSA-N 0.000 description 2
- AKEUNCKRJATALU-UHFFFAOYSA-N 2,6-dihydroxybenzoic acid Chemical compound OC(=O)C1=C(O)C=CC=C1O AKEUNCKRJATALU-UHFFFAOYSA-N 0.000 description 2
- YQUVCSBJEUQKSH-UHFFFAOYSA-N 3,4-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C(O)=C1 YQUVCSBJEUQKSH-UHFFFAOYSA-N 0.000 description 2
- UYEMGAFJOZZIFP-UHFFFAOYSA-N 3,5-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC(O)=CC(O)=C1 UYEMGAFJOZZIFP-UHFFFAOYSA-N 0.000 description 2
- ALRHLSYJTWAHJZ-UHFFFAOYSA-N 3-hydroxypropionic acid Chemical compound OCCC(O)=O ALRHLSYJTWAHJZ-UHFFFAOYSA-N 0.000 description 2
- ALYNCZNDIQEVRV-UHFFFAOYSA-N 4-aminobenzoic acid Chemical compound NC1=CC=C(C(O)=O)C=C1 ALYNCZNDIQEVRV-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 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
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- RWZYAGGXGHYGMB-UHFFFAOYSA-N anthranilic acid Chemical compound NC1=CC=CC=C1C(O)=O RWZYAGGXGHYGMB-UHFFFAOYSA-N 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
- 125000003118 aryl group Chemical group 0.000 description 2
- UJMDYLWCYJJYMO-UHFFFAOYSA-N benzene-1,2,3-tricarboxylic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1C(O)=O UJMDYLWCYJJYMO-UHFFFAOYSA-N 0.000 description 2
- UCMIRNVEIXFBKS-UHFFFAOYSA-N beta-alanine Chemical compound NCCC(O)=O UCMIRNVEIXFBKS-UHFFFAOYSA-N 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 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
- ZQPPMHVWECSIRJ-MDZDMXLPSA-N elaidic acid Chemical compound CCCCCCCC\C=C\CCCCCCCC(O)=O ZQPPMHVWECSIRJ-MDZDMXLPSA-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
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 description 2
- KEMQGTRYUADPNZ-UHFFFAOYSA-N heptadecanoic acid Chemical compound CCCCCCCCCCCCCCCCC(O)=O KEMQGTRYUADPNZ-UHFFFAOYSA-N 0.000 description 2
- XMHIUKTWLZUKEX-UHFFFAOYSA-N hexacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O XMHIUKTWLZUKEX-UHFFFAOYSA-N 0.000 description 2
- ROBFUDYVXSDBQM-UHFFFAOYSA-N hydroxymalonic acid Chemical compound OC(=O)C(O)C(O)=O ROBFUDYVXSDBQM-UHFFFAOYSA-N 0.000 description 2
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 2
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 150000002596 lactones Chemical class 0.000 description 2
- 125000005395 methacrylic acid group Chemical group 0.000 description 2
- ISYWECDDZWTKFF-UHFFFAOYSA-N nonadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCCC(O)=O ISYWECDDZWTKFF-UHFFFAOYSA-N 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- UTOPWMOLSKOLTQ-UHFFFAOYSA-N octacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O UTOPWMOLSKOLTQ-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N pentadecanoic acid Chemical compound CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 2
- 229960003330 pentetic acid Drugs 0.000 description 2
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 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 compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- RGTIBVZDHOMOKC-UHFFFAOYSA-N stearolic acid Chemical compound CCCCCCCCC#CCCCCCCCC(O)=O RGTIBVZDHOMOKC-UHFFFAOYSA-N 0.000 description 2
- 150000003512 tertiary amines Chemical class 0.000 description 2
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- QAIPRVGONGVQAS-DUXPYHPUSA-N trans-caffeic acid Chemical compound OC(=O)\C=C\C1=CC=C(O)C(O)=C1 QAIPRVGONGVQAS-DUXPYHPUSA-N 0.000 description 2
- 150000003628 tricarboxylic acids Chemical class 0.000 description 2
- SZHOJFHSIKHZHA-UHFFFAOYSA-N tridecanoic acid Chemical compound CCCCCCCCCCCCC(O)=O SZHOJFHSIKHZHA-UHFFFAOYSA-N 0.000 description 2
- MTCFGRXMJLQNBG-REOHCLBHSA-N (2S)-2-Amino-3-hydroxypropansäure Chemical compound OC[C@H](N)C(O)=O MTCFGRXMJLQNBG-REOHCLBHSA-N 0.000 description 1
- ACEAELOMUCBPJP-UHFFFAOYSA-N (E)-3,4,5-trihydroxycinnamic acid Natural products OC(=O)C=CC1=CC(O)=C(O)C(O)=C1 ACEAELOMUCBPJP-UHFFFAOYSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LVRFTAZAXQPQHI-RXMQYKEDSA-N (R)-2-hydroxy-4-methylpentanoic acid Chemical compound CC(C)C[C@@H](O)C(O)=O LVRFTAZAXQPQHI-RXMQYKEDSA-N 0.000 description 1
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- RBNPOMFGQQGHHO-UHFFFAOYSA-N -2,3-Dihydroxypropanoic acid Natural products OCC(O)C(O)=O RBNPOMFGQQGHHO-UHFFFAOYSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 description 1
- DNUYOWCKBJFOGS-UHFFFAOYSA-N 2-[[10-(2,2-dicarboxyethyl)anthracen-9-yl]methyl]propanedioic acid Chemical compound C1=CC=C2C(CC(C(=O)O)C(O)=O)=C(C=CC=C3)C3=C(CC(C(O)=O)C(O)=O)C2=C1 DNUYOWCKBJFOGS-UHFFFAOYSA-N 0.000 description 1
- GOJUJUVQIVIZAV-UHFFFAOYSA-N 2-amino-4,6-dichloropyrimidine-5-carbaldehyde Chemical group NC1=NC(Cl)=C(C=O)C(Cl)=N1 GOJUJUVQIVIZAV-UHFFFAOYSA-N 0.000 description 1
- SZIFAVKTNFCBPC-UHFFFAOYSA-N 2-chloroethanol Chemical compound OCCCl SZIFAVKTNFCBPC-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 description 1
- AFENDNXGAFYKQO-UHFFFAOYSA-N 2-hydroxybutyric acid Chemical compound CCC(O)C(O)=O AFENDNXGAFYKQO-UHFFFAOYSA-N 0.000 description 1
- BWLBGMIXKSTLSX-UHFFFAOYSA-N 2-hydroxyisobutyric acid Chemical compound CC(C)(O)C(O)=O BWLBGMIXKSTLSX-UHFFFAOYSA-N 0.000 description 1
- JKRDADVRIYVCCY-UHFFFAOYSA-N 2-hydroxyoctanoic acid Chemical compound CCCCCCC(O)C(O)=O JKRDADVRIYVCCY-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- XFDUHJPVQKIXHO-UHFFFAOYSA-N 3-aminobenzoic acid Chemical compound NC1=CC=CC(C(O)=O)=C1 XFDUHJPVQKIXHO-UHFFFAOYSA-N 0.000 description 1
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004475 Arginine Substances 0.000 description 1
- DPUOLQHDNGRHBS-UHFFFAOYSA-N Brassidinsaeure Natural products CCCCCCCCC=CCCCCCCCCCCCC(O)=O DPUOLQHDNGRHBS-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 239000005632 Capric acid (CAS 334-48-5) Substances 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 239000004970 Chain extender Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- LEVWYRKDKASIDU-QWWZWVQMSA-N D-cystine Chemical compound OC(=O)[C@H](N)CSSC[C@@H](N)C(O)=O LEVWYRKDKASIDU-QWWZWVQMSA-N 0.000 description 1
- RBNPOMFGQQGHHO-UWTATZPHSA-N D-glyceric acid Chemical compound OC[C@@H](O)C(O)=O RBNPOMFGQQGHHO-UWTATZPHSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 241000255925 Diptera Species 0.000 description 1
- URXZXNYJPAJJOQ-UHFFFAOYSA-N Erucic acid Natural products CCCCCCC=CCCCCCCCCCCCC(O)=O URXZXNYJPAJJOQ-UHFFFAOYSA-N 0.000 description 1
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- XUJNEKJLAYXESH-REOHCLBHSA-N L-Cysteine Chemical compound SC[C@H](N)C(O)=O XUJNEKJLAYXESH-REOHCLBHSA-N 0.000 description 1
- ONIBWKKTOPOVIA-BYPYZUCNSA-N L-Proline Chemical compound OC(=O)[C@@H]1CCCN1 ONIBWKKTOPOVIA-BYPYZUCNSA-N 0.000 description 1
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 description 1
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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、特にバックコート層に配合される非磁性粉末の分
散性の改善に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to magnetic recording media such as magnetic tapes, and particularly relates to improving the dispersibility of non-magnetic powder mixed in a back coat layer. .
本発明は、磁気記録媒体を構成するバックコート層中に
オキシ酸、多価カルボン酸、アミノカルボン酸の少なく
とも１種を含有させることにより、非磁性粉末の分散性
の向上及び脱落の減少を図り、電磁変換特性の劣化を改
善するとともに塗膜の耐久性の向上を図ろうとするもの
である。The present invention improves the dispersibility of non-magnetic powder and reduces shedding by incorporating at least one of oxyacid, polyvalent carboxylic acid, and aminocarboxylic acid into the back coat layer constituting the magnetic recording medium. This aims to improve the durability of the coating film while improving the deterioration of electromagnetic conversion characteristics.
磁気記録媒体の磁性層形成面とは反対面に形成されるバ
ックコート層においては、微細な粒子径を有したカーボ
ン等の非磁性粉末を高度に分散させ、該バンク面の表面
粗度をコントロールして磁気記録媒体の巻特性の向上を
図ること、バンク面の耐久性を向上させドロップアウト
の低減や摩擦係数の低減を図ること、さらには非磁性支
持体の帯電を防止して帯電によるゴミの付着防止や走行
安定性の向上を図ること、磁性層中の潤滑剤の移行の減
少を図ること等が要求されている。In the back coat layer formed on the opposite side of the magnetic recording medium from the magnetic layer formation side, non-magnetic powder such as carbon with fine particle size is highly dispersed to control the surface roughness of the bank surface. The aim is to improve the winding characteristics of magnetic recording media, improve the durability of the bank surface to reduce dropouts and reduce the coefficient of friction, and prevent charging of non-magnetic supports to eliminate dust caused by charging. There is a need to prevent the adhesion of magnetic materials, improve running stability, and reduce lubricant migration in the magnetic layer.
すなわち、上記磁気記録媒体のバックコート層にあって
は該バックコート層に含有される非磁性粉末を如何に良
好に塗料中に分散させるか、また、如何に良好に結合剤
と結合させる力・が非常に重要な課題である。In other words, in the back coat layer of the magnetic recording medium, how well the non-magnetic powder contained in the back coat layer is dispersed in the paint, and how well the force and strength for bonding with the binder are determined. is a very important issue.
従来、上記要求を満足する方法として、バックコートＮ
塗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非磁性粉末の親水基
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非磁性粉末と
結合剤とを結合させ、耐久性の向上や上記非磁性粉末の
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
れず、さらには非磁性粉末の脱離が生じる。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, back coat N
A so-called dispersant (for example, a surfactant) is added to the paint to bond the hydrophilic groups of the surfactant with the hydrophilic groups of the non-magnetic powder, and then the lipophilic group of the surfactant and the binder. It has been proposed to bond the nonmagnetic powder and the binder by bonding the lipophilic groups therein, thereby improving the durability and dispersibility of the nonmagnetic powder. 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, and furthermore, the nonmagnetic powder is detached. 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.
これに対して、近年、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、これにより非磁性粉末との界面補強を図ろうと
した場合に、極性基の親水基間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粉体表面の親水基と吸
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を始め各種潤滑剤や分散剤等が存
在した場合に、これらが優先的に非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非磁性粉
末の分散性が劣化する等の問題が生ずる。In response to this, in recent years, a method of introducing a polar group into a binder has been proposed, and a technique has been proposed in which the binder has both the functions of a polymer, a dispersant, and an interface reinforcing agent. However, when trying to introduce a polar group into the binder as described above and thereby reinforcing the interface with the non-magnetic powder, the hydrophilic groups of the polar group become sterile due to the binder's function as a polymer. Due to these obstacles, the hydrophilic groups on the powder surface cannot be sufficiently adsorbed, leading to deterioration of dispersibility, and compounds with long-chain alkyl groups and fatty acids, which are added to paints for the purpose of improving durability, etc. If lubricants, dispersants, etc. are present, they will preferentially adsorb to the non-magnetic powder, preventing the adsorption of the binder that has a dispersion function, resulting in problems such as deterioration of the dispersibility of the non-magnetic powder. .
上述のように、磁気記録媒体の分野においては、使用さ
れる結合剤やそれに添加される極性基の能力不足や極性
基と非磁性粉末の表面特性との係わりあい等に起因して
各種の実用特性に不満を残している。As mentioned above, in the field of magnetic recording media, there are various practical problems due to the lack of ability of the binder used and the polar group added to it, and the relationship between the polar group and the surface characteristics of non-magnetic powder. I am dissatisfied with the characteristics.
そこで、本発明は上述の従来の実情に鑑みて提案された
ものであって、非磁性粉末の分散性の向上及び脱落の減
少を図り、電磁変換特性や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 provides a magnetic recording medium with excellent electromagnetic conversion characteristics and durability by improving the dispersibility of non-magnetic powder and reducing the shedding of non-magnetic powder. The purpose is to
本発明者は上述の目的を達成せんものと鋭意研究の結果
、非磁性粉末と結合剤とを直接作用させるのではなく、
オキシ酸、多価カルボン酸、アミノカルボン酸の少なく
とも１種を介して結合させることで非磁性粉末と結合剤
との親和性が著しく同上し、非磁性粉末の分散性が飛躍
的に向上するとの知見を得るに至った。As a result of intensive research, the present inventor found that in order to achieve the above object, instead of making the non-magnetic powder and the binder interact directly,
By bonding via at least one of oxyacid, polyhydric carboxylic acid, and aminocarboxylic acid, the affinity between the nonmagnetic powder and the binder is significantly improved, and the dispersibility of the nonmagnetic powder is dramatically improved. I came to know something.
本発明は、上記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）の一方の面に磁
性Ｎ（２）を、他方の面に非磁性粉末と結合剤とを主体
とするバックコート層（３）を有してなる磁気記録媒体
において、前記結合剤は分子中に塩基性極性基を有する
樹脂であり、前記バックコートＮ（３）中にオキシ酸、
多価カルボン酸、アミノカルボン酸の少な（とも１種を
含有させたことを特徴とするものである。なお、塗布型
の磁気記録媒体の場合、磁性層が上記構成を有するもの
であってもよ＜、磁性層及びバックコート層の両者が上
述の構成を有していてもよい。The present invention has been made based on the above findings, and as shown in FIG. In a magnetic recording medium having a back coat layer (3) mainly composed of a binder, the binder is a resin having a basic polar group in its molecule, and the back coat N (3) is acid,
It is characterized by containing a small amount (of both polycarboxylic acid and aminocarboxylic acid).In the case of a coating-type magnetic recording medium, even if the magnetic layer has the above structure, Both the magnetic layer and the back coat layer may have the above-described configuration.
ここで、上記磁気記録媒体のバックコート層塗料を構成
する結合剤樹脂とは、通常この種の磁気記録媒体の結合
剤として用いられる樹脂であればいずれのものも使用す
ることができ、この樹脂中には塩基性極性基や酸性極性
基等の各種極性基が導入されていてもよい。また、例え
ば上記極性基が導入された樹脂を単独で用いてもよいし
、上記極性基が４入された樹脂と極性基が導入されてい
ない樹脂との組み合わせや異なる極性基が導入された樹
脂同士の組み合わせ等いずれも使用することができる。Here, the binder resin constituting the back coat layer paint of the magnetic recording medium can be any resin that is normally used as a binder for this type of magnetic recording medium. Various polar groups such as basic polar groups and acidic polar groups may be introduced therein. Further, for example, the resin into which the above polar groups have been introduced may be used alone, a combination of the above resin into which 4 polar groups have been introduced and a resin into which no polar group has been introduced, or a resin into which different polar groups have been introduced. Any combination of these can be used.
なお、上記極性基が導入された樹脂と極性基が導入され
ていない樹脂との組み合わせの場合には、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。In addition, in the case of a combination of a resin into which a polar group has been introduced and a resin into which a polar group has not been introduced, the resin into which a polar group has been introduced must be combined at a ratio of at least 10% or more. be.
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
、熱可塑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, polyfluoride vinyl chloride, 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.
これら樹脂に導入される極性基としては、−３０３Ｍ。The polar group introduced into these resins is -303M.
−Ｏ−ＳＯ３乙 −ＰＯ（ＯＭ）３． −Ｎ−、−Ｎｕ
ｔ、 ＝ＮＨ，−〜−・Ｘ。-O-SO3 -PO(OM)3. -N-, -Nu
t, =NH, -~-.X.
−〇ｌ（等が挙げられる。-〇l(etc.).
前述の極性基の導入方法としては、従来知られる方法が
いずれも使用可能であり、例えば塩基性極性基である第
３アミンや第４アンモニウムを縮合系樹脂（例えばポリ
ウレタン）に導入するには、（１）塩基性極性基含有ポ
リオール、ポリイソシアネート等を鎖延長剤の一部とし
て用いる方法、（１蔦）縮合系樹脂の側鎖あるいは末端
に残存する活性水素等（例えば水酸基）を利用し、活性
水素と反応可能な基と塩基性極性基の両者を分子内に持
つ化合物によって変性する方法、
等によればよい。Any conventionally known method can be used to introduce the above-mentioned polar group. For example, to introduce a basic polar group such as tertiary amine or quaternary ammonium into a condensation resin (for example, polyurethane), (1) Method using basic polar group-containing polyol, polyisocyanate, etc. as part of the chain extender, (1) Utilizing active hydrogen etc. (e.g. hydroxyl group) remaining in the side chain or terminal of condensation resin, For example, a method may be used in which modification is performed using a compound having both a group capable of reacting with active hydrogen and a basic polar group in the molecule.
また、塩化ビニル系樹脂等の共重合系樹脂にこれら塩基
性極性基を導入するには、
（ｉｉｉ ）塩化ビニル等のビニル系モノマーと共重合
可能な二重結合を有する塩基性極性基の両者を分子内に
持つ化合物を重合させる方法、
（ｉｖ ）予め活性水素を導入しておき、これを活性水
素と反応可能な基と塩基性極性基の両者を分子内に持つ
化合物によって変性する方法、等によればよい。In addition, in order to introduce these basic polar groups into a copolymer resin such as a vinyl chloride resin, (iii) both basic polar groups having a double bond that can be copolymerized with a vinyl monomer such as vinyl chloride, etc. (iv) a method of introducing active hydrogen in advance and modifying it with a compound having both a group capable of reacting with active hydrogen and a basic polar group in the molecule; etc.
なお、結合剤中に含まれる極性基の含有量としては０．
００１ ｍ ｍｏｌ／ｇ 〜１．０ ｍ ｍｏ１７ｇの
範囲内であることが好ましい。Note that the content of polar groups contained in the binder is 0.
It is preferably within the range of 0.001 mmol/g to 1.0 mmol/g to 1.0 mmol/g.
また、上記磁気記録媒体のバックコート層に使用される
非磁性粉末としては、例えばコンタクトブラック、チャ
ンネルプラック、ロールブラック、ディスクプラック、
ファー翠スブラック、サーマルブラック、ランププラッ
ク等あらゆる種類のカーボンブラックやＣａＣＯ３扮末
、１３ａｓＯｎ粉末、Ｚｎ○粉末、ａ ＦｅｚＯ３粉
末、Ｔ ｉ Ｏｚ粉末、Ａｌ２Ｏ３粉末、Ｃｒ、Ｏ，粉
末等の無機顔料が挙げられる。ハックコート層中に含有
される非磁性粉末の粒子径としては、０．００１μｍ〜
１μｍ程度の大きさを有したものが好ましく、ま犬非磁
性粉末の表面を酸化処理したもの等表面を変性したもの
であってもよい。Examples of the non-magnetic powder used in the back coat layer of the magnetic recording medium include contact black, channel plaque, roll black, disk plaque,
All kinds of carbon blacks such as fur black, thermal black, and lamp plaque, as well as inorganic pigments such as CaCO3 powder, 13asOn powder, Zn○ powder, aFezO3 powder, TiOz powder, Al2O3 powder, Cr, O, powder, etc. Can be mentioned. The particle size of the non-magnetic powder contained in the hack coat layer is 0.001 μm to
It is preferable to have a size of about 1 μm, and the surface may be modified, such as by oxidizing the surface of non-magnetic powder.
本発明の磁気記録媒体においてバックコート層は、上述
の非磁性粉末を上述した結合剤中に分散させ、これを有
機溶剤に溶解してバックコート層塗料を調製し、磁性層
形成面とは反対の面に塗布形成すればよい。上述のよう
にバックコート層を設ける場合には、磁性層は磁性塗料
を塗布形成してもよく、また強磁性材料を真空蒸着、イ
オンブレーティング、スパッタリング、メツキ等の手段
によって非磁性支持体上に被着形成してもよい。In the magnetic recording medium of the present invention, the back coat layer is prepared by dispersing the above-mentioned non-magnetic powder in the above-mentioned binder and dissolving this in an organic solvent to prepare a back coat layer paint, and forming the back coat layer on the opposite side of the magnetic layer forming surface. It can be formed by coating on the surface. When providing a back coat layer as described above, the magnetic layer may be formed by coating a magnetic paint, or a ferromagnetic material may be coated on a non-magnetic support by means such as vacuum evaporation, ion blasting, sputtering, plating, etc. It may be formed by adhering to the surface.
上記バックコート層を塗布形成する際に使用する有ＲＮ
剤としては、アセトン、メチルエチルケトン、メチルイ
ソブチルケトン、シクロヘキサノン等のケトン系、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、ヘンイン。トル
エン、キシレン等の芳香族炭化水素、ヘキサン。RN used when coating and forming the above-mentioned back coat layer
Examples of agents include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, esters such as methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, and glycol acetate monoethyl ether, glycol dimethyl ether, glycol monoethyl ether,
Glycol ethers such as dioxane, heinine. Aromatic hydrocarbons such as toluene and xylene, hexane.
ヘプタン等の脂肪族炭化水素、メチレンクロライド、エ
チレンクロライド、四塩化炭素、クロロホルム、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 aliphatic hydrocarbons such as heptane, chlorinated hydrocarbons such as methylene chloride, ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin, and dichlorobenzene.
本発明においては、上述した結合剤と非磁性粉末との間
に介在させ、該結合剤と非磁性粉末との親和性を高め、
結合剤中での非磁性粉末の分散性を良好とするとともに
該結合剤と非磁性粉末との結合力を強化する添加物とし
てオキシ酸、多価カルボン酸、アミノカルボン酸の少な
くとも１種をバックコート層に配合している。In the present invention, the above-mentioned binder is interposed between the binder and the non-magnetic powder to increase the affinity between the binder and the non-magnetic powder,
At least one of oxyacid, polyhydric carboxylic acid, and aminocarboxylic acid is added as a backing agent to improve the dispersibility of the nonmagnetic powder in the binder and to strengthen the bond between the binder and the nonmagnetic powder. Contains in the coating layer.
ここで、上記オキシ酸は、分子中にプロトン供与性の酸
性基間である一ＣＯＯ）Ｉと−ＯＨとを各々１以上分子
中に有した化合物である。上記オキシ酸は、脂肪族オキ
シ酸の１塩基酸、脂肪族オキシ酸の２塩基酸、脂肪族オ
キシ酸のラクトンやその他のものがある。これらを具体
的に例示すると、脂肪族オキシ酸の１塩基酸としてはグ
リコール酸、グリセリン酸、乳酸、３−ヒドロキシプロ
ピオン酸、α−ヒドロキシイソブチル酸、β−ヒドロキ
シ−ｎ−５８Ｍ、α−ヒドロキシ−イソ−カプロン酸、
α−ヒドロキシ−ｎ−カプリル酸、α−ヒドロキシ−酪
酸、２，２−ビス−ヒドロキシメチルプロピオン酸、オ
キシ吉草酸、オキシラウリン酸、オキシミリスチン酸、
オキシバルミチン酸、オキシステアリン酸、オキシベヘ
ン酸等が挙げられ、脂肪族オキシ酸の２塩基酸としては
酒石酸、リンゴ酸、タルトロン酸、ジオキシミリスチン
酸、ジオキシバルミチン酸、ジオキシステアリン酸、ト
リオキシバルミチン酸等が挙げられ、ラクトンとしては
Ｌ−アスコルビン酸等が挙げられる。また、その他のオ
キシ酸としては没食子酸、ｍ−ヒドロキシ安息香酸、ｐ
−ヒドロキシ安息香酸、０−ヒドロキシ安息香酸、パラ
ソルビン酸、リシノール酸、サリチル酸、オキシフェニ
ル酢酸、プロトカテチュ酸、ゲンチシン酸、α−レゾル
シル酸、β−レゾルシル酸、γ−レゾルシル酸、オルセ
リン酸、カフェー酸、ランベル酸、３−オキシフタル酸
等が挙げられる。Here, the above-mentioned oxyacid is a compound having one or more proton-donating acidic groups, iCOO)I and -OH, in the molecule. The above-mentioned oxyacids include monobasic aliphatic oxyacids, dibasic aliphatic oxyacids, lactones of aliphatic oxyacids, and others. To specifically illustrate these, monobasic acids of aliphatic oxyacids include glycolic acid, glyceric acid, lactic acid, 3-hydroxypropionic acid, α-hydroxyisobutyric acid, β-hydroxy-n-58M, α-hydroxy- iso-caproic acid,
α-hydroxy-n-caprylic acid, α-hydroxy-butyric acid, 2,2-bis-hydroxymethylpropionic acid, oxyvaleric acid, oxylauric acid, oxymyristic acid,
Oxybalmitic acid, oxystearic acid, oxybehenic acid, etc. are mentioned, and the dibasic acids of aliphatic oxyacids include tartaric acid, malic acid, tartronic acid, dioxymyristic acid, dioxybalmitic acid, dioxystearic acid, trioxy Examples include valmitic acid, and examples of the lactone include L-ascorbic acid. In addition, other oxyacids include gallic acid, m-hydroxybenzoic acid, and p-hydroxybenzoic acid.
-Hydroxybenzoic acid, 0-hydroxybenzoic acid, parasorbic acid, ricinoleic acid, salicylic acid, oxyphenylacetic acid, protocatechuic acid, gentisic acid, α-resorcylic acid, β-resorcylic acid, γ-resorcylic acid, orceric acid, caffeic acid , lamberic acid, 3-oxyphthalic acid and the like.
また、上記多価カルボン酸は分子中にプロトン供与性の
酸性基間である一ＣＯＯＨを２以上分子中に有した化合
物である。上記多価カルボン酸を具体的に例示すると、
−ＣＯＯＨを２個分子中に有したジカルボン酸、−ＣＯ
ＯＨを３個分子中に有したトリカルボン酸、−ＣＯＯＨ
を４個分子中に有したテトラカルボン酸等が挙げられる
。上記ジカルボン酸としては、シュウ酸、マロン酸、コ
ハク酸、グルタル酸、アジピン酸、ピメリン酸、スペリ
ン酸、アゼライン酸、セバシン酸等の脂肪族飽和ジカル
ボン酸類、マレイン酸、フマル酸等の脂肪族不飽和ジカ
ルボン酸類、フタル酸、イソフタル酸、テレフタル酸等
の芳香族ジカルボン酸類が挙げられる。Further, the above-mentioned polyhydric carboxylic acid is a compound having two or more 1-COOH, which is a proton-donating acidic group, in the molecule. Specific examples of the polyhydric carboxylic acids are as follows:
Dicarboxylic acid containing two -COOH molecules, -CO
Tricarboxylic acid with 3 OH molecules in the molecule, -COOH
Examples include tetracarboxylic acids having four of them in the molecule. The dicarboxylic acids mentioned above include aliphatic saturated dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, superric acid, azelaic acid, and sebacic acid, and aliphatic unsaturated dicarboxylic acids such as maleic acid and fumaric acid. Examples include saturated dicarboxylic acids, and aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, and terephthalic acid.
トリカルボン酸としてはベンゼントリカルボン酸が挙げ
られ、テトラカルボン酸としてはヘンゼンテトラカルポ
ン酸等が挙げられる。Examples of the tricarboxylic acid include benzenetricarboxylic acid, and examples of the tetracarboxylic acid include henzenetetracarboxylic acid.
さらに、上記アミノカルボン酸は、造塩能を有する基で
ある一ＣＯＯ）ｌと配位能を有するアミン基を各々１以
上分子中に有した化合物である。上記アミノカルボン酸
を具体的に例示すると、イミノニ酢酸（ＩＯＡ） 、エ
チレンジアミン四酢Ｍ （ＥＤＴＡ）、ニトリロニ酢酸
（ＮＴＡ） 、ウラミルニ酢酸（ＵＤＡ） 、ジエチレ
ントリアミン五酢酸（ＤＴＰＡ）、エチレングリコール
ビス（２アミノエチル）エーテルジアミン四酢酸（ＧＥ
ＤＴＡ） 、トリエチレンテトラミン六酢酸（ＴＴＨＡ
）、１，２シクロヘキサンジアミン−Ｎ、 Ｎ’−四酢
酸（ＣＹＤＴＡ） 、β−アミノエチルスルホン酸−Ｎ
、Ｎ“−二酢酸、β−アミノエチルホスホン酸−Ｎ、
Ｎ’−二酢酸等の他、脂肪族アミノカルボン酸としてグ
リシン、アラニン、バリン、ロイシン、イソロイシン、
セリン、トレオニン、システィン、シスチン、メチオニ
ン、アスパラギン酸、グルタミン酸、リジン、アルギニ
ン、芳香族核を持つアミノカルボン酸としてフェニルア
ラニン、チロシン、複素環を持つアミノカルボン酸とし
てヒスチジン、トリプトファン、プロリン、オキシプロ
リン等が挙げられ、さらにβ−アミノプロピオン酸、Ｔ
−アミノ酪酸、アントラニル酸、ｍ−アミノ安息香酸、
ｐ−アミノ安息香酸等が挙げられる。Furthermore, the above aminocarboxylic acid is a compound having one or more amine groups each having a coordination ability and one COO)l group having a salt-forming ability in its molecule. Specific examples of the above aminocarboxylic acids include iminodiacetic acid (IOA), ethylenediaminetetraacetic acid M (EDTA), nitriloniacetic acid (NTA), uramyldiacetic acid (UDA), diethylenetriaminepentaacetic acid (DTPA), ethylene glycol bis(2-amino) ethyl)etherdiaminetetraacetic acid (GE
DTA), triethylenetetraminehexaacetic acid (TTHA)
), 1,2 cyclohexanediamine-N, N'-tetraacetic acid (CYDTA), β-aminoethylsulfonic acid-N
, N“-diacetic acid, β-aminoethylphosphonic acid-N,
In addition to N'-diacetic acid, etc., aliphatic aminocarboxylic acids such as glycine, alanine, valine, leucine, isoleucine,
Serine, threonine, cysteine, cystine, methionine, aspartic acid, glutamic acid, lysine, arginine, aminocarboxylic acids with an aromatic nucleus such as phenylalanine, tyrosine, aminocarboxylic acids with a heterocycle such as histidine, tryptophan, proline, oxyproline, etc. In addition, β-aminopropionic acid, T
-aminobutyric acid, anthranilic acid, m-aminobenzoic acid,
Examples include p-aminobenzoic acid.
上記すキシ酸、多価カルボン酸、アミノカルボン酸は、
バックコート層に使用される非磁性粉末の性質に応じて
最適なものを選べばよく、例えばこれら非磁性粉末表面
が塩基性である場合にはオキシ酸や多価カルボン酸が好
ましく、非磁性粉末表面が酸性である場合にはアミノカ
ルボン酸が好ましい。The above-mentioned oxyacids, polycarboxylic acids, and aminocarboxylic acids are
The most suitable one can be selected depending on the properties of the non-magnetic powder used in the back coat layer.For example, when the surface of these non-magnetic powders is basic, oxyacids and polyvalent carboxylic acids are preferable; Aminocarboxylic acids are preferred when the surface is acidic.
上記オキシ酸、多価カルボン酸、アミノカルボン酸の何
れにおいてもアルキル基等非極性部分が余り大きいと結
合剤との結合力が低下すること、また該オキシ酸、多価
カルボン酸、アミノカルボン酸はそれ自身が分散剤とし
て機能したり、潤滑剤として機能させるわけではないこ
とから炭素数は９以下であることが好ましい。しかし、
特に芳香族系のオキシ酸、多価カルボン酸、アミノカル
ボン酸の場合にはこの限りでない。In any of the above oxyacids, polycarboxylic acids, and aminocarboxylic acids, if the nonpolar moiety such as an alkyl group is too large, the bonding force with the binder will decrease. The number of carbon atoms is preferably 9 or less because it does not function as a dispersant or a lubricant by itself. but,
In particular, this does not apply to aromatic oxyacids, polyhydric carboxylic acids, and aminocarboxylic acids.
上記オキシ酸、多価カルボン酸、アミノカルボン酸を非
磁性粉末と結合剤の間に介す・る方法としては、バック
コート層塗料を炸裂する際に添加する方法、また非磁性
粉末をあらかじめ上記オキシ酸、多価カルボン酸、アミ
ノカルボン酸等で表面処理する方法、さらにバックコー
ト層を形成した後その上部より塗布する方法がある。上
記オキシ酸、多価カルボン酸、アミノカルボン酸の添加
量としてはバックコート層では、非磁性粉末１００重量
部に対して０．０５〜１０重量部（０，０５〜１０ Ｐ
ＨＰと表す。以下、同じ、）の範囲内であることが好ま
しく、０．３〜５ ＰＨＰの範囲内であることがより好
ましい。上記オキシ酸、多価カルボン酸、アミノカルボ
ン酸等の添加量がこの１、ｎ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 oxyacid, polyvalent carboxylic acid, or aminocarboxylic acid can be interposed between the non-magnetic powder and the binder by adding it when exploding the back coat layer paint, or by adding the above-mentioned non-magnetic powder in advance. There are a method of surface treatment with oxyacid, polyhydric carboxylic acid, aminocarboxylic acid, etc., and a method of forming a back coat layer and then coating it from above. The amount of the oxyacid, polycarboxylic acid, and aminocarboxylic acid added in the back coat layer is 0.05 to 10 parts by weight (0.05 to 10 parts by weight) per 100 parts by weight of the nonmagnetic powder.
It is expressed as HP. It is preferably within the range of ), and more preferably within the range of 0.3 to 5 PHP. If the amount of the oxyacid, polycarboxylic acid, aminocarboxylic acid, etc. added is less than this range, no effect can be expected from adding these compounds, and if the amount of these compounds added is more than this range. In this case, the coating film becomes acidic and the corrosion resistance of the coating film deteriorates.
上述したバックコート層中には、上述した結合剤や各種
粉体の他に通常磁気記録媒体添加剤として使用される分
散剤、潤滑剤、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オキシ酸
、多価カルボン酸、アミノカルボン酸等の添加効果を阻
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 various powders, the above-mentioned back coat layer contains dispersants, lubricants, abrasives, antistatic agents, rust preventives, etc., which are usually used as additives for magnetic recording media. You can. When these substances are added, it is preferable to add them within a range that does not inhibit the effects of addition of oxyacids, polycarboxylic acids, aminocarboxylic acids, etc.
特に、バックコート層に潤滑性を付与しバックコート層
の耐久性を向上させる目的で使用す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のバックコート層に用いられる
ものであればいずれのものであってもよく、飽和脂肪酸
、不飽和脂肪酸等が使用可能である。上記脂肪酸を具体
的に示すと、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、バルミ
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。In particular, as the fatty acid used for the purpose of imparting lubricity to the back coat layer and improving the durability of the back coat layer, a fatty acid having a carbon number of 10 or more is usually used. The fatty acid may be any fatty acid that is normally used in the back coat layer of this type of magnetic recording medium, and saturated fatty acids, unsaturated fatty acids, etc. can be used. Specifically, the above fatty acids include capric acid, undecylic acid, lauric acid,
Tridecylic acid, myristic acid, pentadecylic acid, balmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachidic acid, hehenic acid, lignoceric acid, cerotic acid, heptaconic acid, montanic acid, melisic acid, lafcelic acid, undecylic acid, oleic acid , elaidic acid, cetoleic acid, erucic acid, brassic acid, linoleic acid, linoleic acid, arachidonic acid, stearolic acid, and the like.
これら脂肪酸は、その構造中に有しているアルキル基が
非極性であるため、結合剤との結合力が弱い一方、非磁
性粉末の表面が塩基性であった場合には優先的に該脂肪
酸が吸着してしまい塗膜の耐久性を著しく劣化させてい
る。しかしながら、本発明の磁気記録媒体では、磁性層
中にオキシ酸、多価カルボン酸、アミノカルボン酸の少
なくとも１種を添加しているため、塩基性の活性点を有
する非磁性粉末の表面に上記オキシ酸、多価カルボン酸
、アミノカルボン酸等が優先的に吸着して、非磁性粉末
の表面を見掛は上酸性点としている。These fatty acids have a non-polar alkyl group in their structure, so they have a weak bonding force with the binder, but if the surface of the non-magnetic powder is basic, the fatty acids preferentially is adsorbed, significantly deteriorating the durability of the paint film. However, in the magnetic recording medium of the present invention, since at least one of oxyacid, polyvalent carboxylic acid, and aminocarboxylic acid is added to the magnetic layer, the above-mentioned Oxyacids, polyhydric carboxylic acids, aminocarboxylic acids, etc. are preferentially adsorbed, and the surface of the nonmagnetic powder appears to be an upper acidic point.
そのため脂肪酸等が吸着することなく、非磁性粉末が良
好に結合剤と結合することになり非磁性粉末の分散性を
向上させている。また、脂肪酸はバックコート層中に単
独で存在することになり潤滑効果を良好に発揮すること
ができる。Therefore, the non-magnetic powder is well bonded to the binder without adsorption of fatty acids and the like, thereby improving the dispersibility of the non-magnetic powder. Furthermore, since the fatty acid exists alone in the back coat layer, it can exhibit a good lubricating effect.
上述のようなバックコート層を形成した磁気記録媒体の
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
（、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。The material for the nonmagnetic support of the magnetic recording medium on which the back coat layer is formed may be any material that is normally used in this type of magnetic recording medium (for example, polyethylene terephthalate). Polyesters such as polyethylene.
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、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。Polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate, cellulose diacetate, cellulose acetate butyrate, vinyl resins such as polyvinyl chloride and polyvinylidene chloride, polycarbonate, and polyimide.
ポリアミド、ポリアミドイミ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、シート、ディスク、カード、ドラム等のいず
れでも良い。Plastics such as polyamide and polyamideimide, paper,
Examples include metals such as aluminum and copper, light alloys such as aluminum alloys and titanium alloys, ceramics, and single crystal silicon. The nonmagnetic support may be in any form such as a film, tape, sheet, disk, card, or drum.
オキシ酸、多価カルボ゛ン酸はこれらの分子中に含まれ
る一方のプロトン供与性酸性基図が非磁性粉末の表面の
塩基性活性点と結合するとともに、少なくとももう一方
のプロトン供与性酸性基図が結合剤樹脂のプロトン受容
性の窒素と配位結合するため、結合剤中での非磁性粉末
の分散性、界面補強性に著しい効果を発揮する。In oxyacids and polycarboxylic acids, one proton-donating acidic group contained in these molecules bonds with the basic active site on the surface of the nonmagnetic powder, and at least the other proton-donating acidic group Since the ferrite forms a coordinate bond with the proton-accepting nitrogen of the binder resin, it has a remarkable effect on the dispersibility of the nonmagnetic powder in the binder and the interfacial reinforcing properties.
これに対してアミノカルボン酸は、該分子中に含まれる
プロトン受容性の窒素が非磁性粉末の表面の酸性基間と
結合し、他方のプロトン供与性酸性基図が結合剤樹脂の
プロトン受容性の窒素と配位結合するため、結合剤中で
の非磁性粉末の分散性、界面補強性に著しい効果を発揮
する。On the other hand, in aminocarboxylic acids, the proton-accepting nitrogen contained in the molecule bonds with the acidic groups on the surface of the non-magnetic powder, and the other proton-donating acidic group forms the proton-accepting nitrogen of the binder resin. Because it coordinates with nitrogen in the binder, it has a remarkable effect on the dispersibility of the nonmagnetic powder in the binder and on the interface reinforcing properties.
また、非磁性粉末の表面の塩基性活性点または酸性活性
点にオキシ酸、多価カルボン酸、アミノカルボン酸が吸
着することにより、非磁性粉末の表面がプロトン供与性
の酸性基間に覆われるため、脂肪酸等の酸素供与性原子
団を有する各種の添加剤の粉体への吸着を妨げ、その結
果分散安定性や界面補強を失うことなく塗膜が完成され
、高磁気特性を有し、表面光沢の高い且つ耐久性に優れ
た塗膜が完成される。In addition, by adsorbing oxyacids, polycarboxylic acids, and aminocarboxylic acids to the basic or acidic active sites on the surface of the nonmagnetic powder, the surface of the nonmagnetic powder is covered between proton-donating acidic groups. This prevents the adsorption of various additives containing oxygen-donating atomic groups such as fatty acids to the powder, and as a result, the coating film is completed without losing dispersion stability or interfacial reinforcement, and has high magnetic properties. A coating film with high surface gloss and excellent durability is completed.
以下、本発明の具体的な実施例について説明するが、本
発明はこの実施例に限定されるものではないことはいう
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.
大見貫↓
カーボン（粒子径２３ｍ ｔｔ 、ｐＨ２，５）
５重量部活合剤（３級アミン ０．３モル ３．３
重量部含有ウレタン）
溶剤（メチルエチルケトン） ２４．９重量部オ
キシ酸（クエン酸）０．１重量部
上記組成物をボールミルにて２４時間混合してからフィ
ルターを通して取り出し、このバックコート層塗料を磁
性層が予め形成されている１２μｍ厚のポリエチレンテ
レフタレートフィルムの裏面に乾燥後の厚みが２μｍと
なるように塗布し、磁場配向をしたのち巻取った。これ
をカレンダー処理した後１／２インチ幅に裁断し、サン
プルテープを作製した。Ominuki↓ Carbon (particle size 23m tt, pH 2.5)
5 parts by weight activating agent (tertiary amine 0.3 mol 3.3
Solvent (methyl ethyl ketone): 24.9 parts by weight Oxyacid (citric acid): 0.1 part by weight The above composition was mixed in a ball mill for 24 hours and taken out through a filter, and this back coat layer paint was used as a magnetic layer. It was coated on the back side of a 12 μm thick polyethylene terephthalate film on which had been formed in advance so that the thickness after drying would be 2 μm, and after magnetic field orientation, it was wound up. This was calendered and cut into 1/2 inch width to produce sample tapes.
去旌■童
実施例１において添加剤として使用したクエン酸をアミ
ノカルボン酸の１種であるＮＴＡ にトリロ三酢酸）に
代え、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。A sample tape was prepared in the same manner as in Example 1, except that the citric acid used as the additive in Example 1 was replaced with NTA (trilotriacetic acid), which is a type of aminocarboxylic acid.
大立拠主
実施例１において添加剤として使用したクエン酸を多価
カルボン酸の１種であるフタル酸に代え、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。Major basis Example 1 The citric acid used as an additive in Example 1 was replaced with phthalic acid, which is a type of polyhydric carboxylic acid, and the rest was Example 1.
A sample tape was prepared in the same manner as above.
去施勇↓ 実施例１で使用したカーボンを表面積２３ｍμ。Isamu Gose↓ The carbon used in Example 1 had a surface area of 23 mμ.
ｐＨ６，０のカーボンに代え、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。A sample tape was prepared in the same manner as in Example 1 except that carbon having a pH of 6.0 was used.
大庭■立 実施例２で使用したカーボンを表面積２３ｍμ。Ohba ■Tachi The carbon used in Example 2 had a surface area of 23 mμ.
ｐ）１６．０のものに代え、他は実施例２と同様の方法
によりサンプルテープを作製した。p) A sample tape was produced in the same manner as in Example 2, except that the sample tape was replaced with that of 16.0.
去１奥ｉ 実施例３で使用したカーボンを表面積２３ｍμ。last 1 back i The carbon used in Example 3 had a surface area of 23 mμ.
ｐＨ６，０のものに代え、他は実施例３と同様の方法に
よりサンプルテープを作製した。A sample tape was prepared in the same manner as in Example 3, except that the tape had a pH of 6.0.
止較±上
実施例４で使用した結合剤を一３ＯＪａ基０．０５ｍ
ｍ。For comparison, the binder used in Example 4 was
m.
１／ｇ含有ウレタンに代え、他は実施例４と同様の方法
によりサンプルテープを作製した。A sample tape was prepared in the same manner as in Example 4 except that urethane containing 1/g was used.
ル蚊±１
実施例５で使用した結合剤を一３Ｏ３Ｎａ基０．０５ｍ
ｍ。Mosquito ±1 The binder used in Example 5 was
m.
１／ｇ含有ウレタンに代え、他は実施例５と同様の方法
によりサンプルテープを作製した。A sample tape was prepared in the same manner as in Example 5 except that urethane containing 1/g was used.
止較闇１
実施例６で使用した結合剤を−Ｓｏ、Ｎａ基０．０５ｍ
ｍ。Comparison 1 The binder used in Example 6 is -So, Na group 0.05m
m.
！／ｇ含有ウレタンに代え、他は実施例６と同様の方法
によりサンプルテープを作製した。! A sample tape was prepared in the same manner as in Example 6, except that the sample tape was replaced with urethane containing /g.
比較例４
実施例１において添加剤を添加しないブランク組成物を
使用して、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。Comparative Example 4 A sample tape was produced in the same manner as in Example 1 except for using the blank composition in which no additive was added in Example 1.
比較例５
実施例４において添加剤を添加しないブランク組成物を
使用して、他は実施例４と同様の方法によりサンプルテ
ープを作製した。Comparative Example 5 A sample tape was produced in the same manner as in Example 4 except for using the blank composition to which no additive was added.
此１旧州ｉ
比較例１において添加剤を添加しないブランク組成物を
使用して、他は比較例１と同様の方法によりサンプルテ
ープを作製した。A sample tape was prepared in the same manner as in Comparative Example 1, except that a blank composition without additives was used in Comparative Example 1.
上述のようにして作製された各サンプルテープについて
グロス、扮落ちを測定した。上記グロスは光沢針を用い
て入射角４５°、反射角４５°及び入射角７５°、反射
角７５°における反射率を測定した。Gloss and fading were measured for each sample tape produced as described above. The reflectance of the above gloss was measured using a glossy needle at an incident angle of 45° and a reflection angle of 45°, and at an incident angle of 75° and a reflection angle of 75°.
また、粉落ちは６０分シャトル１００回走行後のヘッド
ドラム、ガイドピン等への扮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、粉落ち量の多いもの
を一５点として評価した。In addition, for powder falling off, visually observe the amount of falling powder 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
その結果を第１表に示す。The results are shown in Table 1.
（以下余白）
第１表
第１表の結果より明らかなように、ハックコート層中に
オキシ酸、多価カルボン酸、アミノカルボン酸の何れか
１種を添加することにより粉落ちが非常に少なくなり、
磁気記録媒体の耐久性が向上する。(Left below) Table 1 As is clear from the results in Table 1, adding any one of oxyacid, polyhydric carboxylic acid, and aminocarboxylic acid to the hack coat layer significantly reduces powder falling. Become,
The durability of magnetic recording media is improved.
以上の説明より明らかなように、オキシ酸、多価カルボ
ン酸、アミノカルボン酸の少なくとも１種が結合剤樹脂
と非磁性粉末との間に介在して、これらと良好に結合す
るため、潤滑剤や分散剤等各種添加剤の非磁性粉末への
吸着を防ぐとともに、分散安定性及び界面補強性を失う
ことなく且つ表面光沢が高く強度に優れた塗膜を完成す
ることができる。As is clear from the above explanation, at least one of oxyacid, polyhydric carboxylic acid, and aminocarboxylic acid is present between the binder resin and the nonmagnetic powder and binds well with them. It is possible to prevent adsorption of various additives such as powders and dispersants to the non-magnetic powder, and to complete a coating film with high surface gloss and excellent strength without losing dispersion stability and interfacial reinforcing properties.
したがって、これを磁気記録媒体のバックコート層とす
ることにより、電磁変換特性や塗膜の耐久性に優れた磁
気記録媒体を提供することができる。Therefore, by using this as a back coat layer of a magnetic recording medium, a magnetic recording medium with excellent electromagnetic conversion characteristics and coating film 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。
ｌ・・・非磁性支持体
２・・・磁性層
３・・・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 画材 榮−
同 佐藤 勝
第１ 図
手続主甫正書（自発）
昭和６３年６月２０日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. l...Non-magnetic support 2...Magnetic layer 3...Back coat layer Patent applicant Sony Corporation agent Patent attorney Kodo Kobo Art materials Sakae Masaru Sato No. 1 Figure Proceedings Principal Hosho ( (Voluntary) June 20, 1986
Claims (1)
粉末と結合剤とを主体とするバックコート層を有してな
る磁気記録媒体において、 前記バックコート層中にオキシ酸、多価カルボン酸、ア
ミノカルボン酸の少なくとも１種を含有させたことを特
徴とする磁気記録媒体。[Scope of Claims] A magnetic recording medium comprising a magnetic layer on one side of a non-magnetic support and a back coat layer mainly composed of non-magnetic powder and a binder on the other side, comprising: A magnetic recording medium characterized in that a layer contains at least one of an oxyacid, a polycarboxylic acid, and an aminocarboxylic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1874988A JPH01194129A (en) | 1988-01-29 | 1988-01-29 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1874988A JPH01194129A (en) | 1988-01-29 | 1988-01-29 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01194129A true JPH01194129A (en) | 1989-08-04 |
Family
ID=11980300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1874988A Pending JPH01194129A (en) | 1988-01-29 | 1988-01-29 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01194129A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS578925A (en) * | 1980-06-20 | 1982-01-18 | Tdk Corp | Magnetic recording medium |
| JPS5963030A (en) * | 1982-10-01 | 1984-04-10 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS59172134A (en) * | 1983-03-20 | 1984-09-28 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS60263318A (en) * | 1984-06-09 | 1985-12-26 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS6159623A (en) * | 1984-08-29 | 1986-03-27 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS61243930A (en) * | 1985-04-19 | 1986-10-30 | Intaafueisu Gijutsu Kenkyusho:Kk | Magnetic recording medium |
| JPH01192013A (en) * | 1988-01-28 | 1989-08-02 | Sony Corp | Magnetic recording medium |
-
1988
- 1988-01-29 JP JP1874988A patent/JPH01194129A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS578925A (en) * | 1980-06-20 | 1982-01-18 | Tdk Corp | Magnetic recording medium |
| JPS5963030A (en) * | 1982-10-01 | 1984-04-10 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS59172134A (en) * | 1983-03-20 | 1984-09-28 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS60263318A (en) * | 1984-06-09 | 1985-12-26 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS6159623A (en) * | 1984-08-29 | 1986-03-27 | Hitachi Maxell Ltd | Magnetic recording medium |
| JPS61243930A (en) * | 1985-04-19 | 1986-10-30 | Intaafueisu Gijutsu Kenkyusho:Kk | Magnetic recording medium |
| JPH01192013A (en) * | 1988-01-28 | 1989-08-02 | Sony Corp | Magnetic recording medium |
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