JPS62256219A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62256219A JPS62256219A JP9689186A JP9689186A JPS62256219A JP S62256219 A JPS62256219 A JP S62256219A JP 9689186 A JP9689186 A JP 9689186A JP 9689186 A JP9689186 A JP 9689186A JP S62256219 A JPS62256219 A JP S62256219A
- Authority
- JP
- Japan
- Prior art keywords
- carbon
- compd
- magnetic recording
- group
- 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 64
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000002253 acid Substances 0.000 claims abstract description 18
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims abstract description 14
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000005855 radiation Effects 0.000 claims abstract description 13
- 239000004814 polyurethane Substances 0.000 claims abstract description 8
- 229920002635 polyurethane Polymers 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 239000006229 carbon black Substances 0.000 claims abstract description 4
- 239000011164 primary particle Substances 0.000 claims abstract description 3
- 150000001875 compounds Chemical class 0.000 claims description 18
- 239000004800 polyvinyl chloride Substances 0.000 claims description 6
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 6
- 150000001805 chlorine compounds Chemical class 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 abstract description 11
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 9
- 230000001678 irradiating effect Effects 0.000 abstract description 2
- -1 isocyanate compound Chemical class 0.000 description 21
- 238000000034 method Methods 0.000 description 19
- 229920001577 copolymer Polymers 0.000 description 17
- 229920002554 vinyl polymer Polymers 0.000 description 14
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 239000007788 liquid Substances 0.000 description 10
- 229920002678 cellulose Polymers 0.000 description 9
- 235000010980 cellulose Nutrition 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 9
- 239000001913 cellulose Substances 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 125000005442 diisocyanate group Chemical group 0.000 description 5
- 238000010894 electron beam technology Methods 0.000 description 5
- 239000012948 isocyanate Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N urethane group Chemical group NC(=O)OCC JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 4
- VGHSXKTVMPXHNG-UHFFFAOYSA-N 1,3-diisocyanatobenzene Chemical compound O=C=NC1=CC=CC(N=C=O)=C1 VGHSXKTVMPXHNG-UHFFFAOYSA-N 0.000 description 3
- OHLKMGYGBHFODF-UHFFFAOYSA-N 1,4-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=C(CN=C=O)C=C1 OHLKMGYGBHFODF-UHFFFAOYSA-N 0.000 description 3
- SBJCUZQNHOLYMD-UHFFFAOYSA-N 1,5-Naphthalene diisocyanate Chemical compound C1=CC=C2C(N=C=O)=CC=CC2=C1N=C=O SBJCUZQNHOLYMD-UHFFFAOYSA-N 0.000 description 3
- FWWWRCRHNMOYQY-UHFFFAOYSA-N 1,5-diisocyanato-2,4-dimethylbenzene Chemical compound CC1=CC(C)=C(N=C=O)C=C1N=C=O FWWWRCRHNMOYQY-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-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
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-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
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 description 3
- 231100000987 absorbed dose Toxicity 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- ALQLPWJFHRMHIU-UHFFFAOYSA-N 1,4-diisocyanatobenzene Chemical compound O=C=NC1=CC=C(N=C=O)C=C1 ALQLPWJFHRMHIU-UHFFFAOYSA-N 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- OZJPLYNZGCXSJM-UHFFFAOYSA-N 5-valerolactone Chemical compound O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-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
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-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
- UWHCKJMYHZGTIT-UHFFFAOYSA-N Tetraethylene glycol, Natural products OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 2
- 150000007513 acids Chemical class 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
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- DHZSIQDUYCWNSB-UHFFFAOYSA-N chloroethene;1,1-dichloroethene Chemical compound ClC=C.ClC(Cl)=C DHZSIQDUYCWNSB-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- CRSOQBOWXPBRES-UHFFFAOYSA-N neopentane Chemical compound CC(C)(C)C CRSOQBOWXPBRES-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000005056 polyisocyanate Substances 0.000 description 2
- 229920001228 polyisocyanate Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- 238000007127 saponification reaction Methods 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 229920001187 thermosetting polymer Polymers 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
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 2
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- QMMJWQMCMRUYTG-UHFFFAOYSA-N 1,2,4,5-tetrachloro-3-(trifluoromethyl)benzene Chemical compound FC(F)(F)C1=C(Cl)C(Cl)=CC(Cl)=C1Cl QMMJWQMCMRUYTG-UHFFFAOYSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- 150000000185 1,3-diols Chemical class 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- YVGASWYKHVPNEW-UHFFFAOYSA-N 1,6-diisocyanato-5,5-dimethylcyclohexa-1,3-diene Chemical compound CC1(C)C=CC=C(N=C=O)C1N=C=O YVGASWYKHVPNEW-UHFFFAOYSA-N 0.000 description 1
- JETYEYTVNWNEID-UHFFFAOYSA-N 1,6-diisocyanatohexane;5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane Chemical compound O=C=NCCCCCCN=C=O.CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 JETYEYTVNWNEID-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
- QFGCFKJIPBRJGM-UHFFFAOYSA-N 12-[(2-methylpropan-2-yl)oxy]-12-oxododecanoic acid Chemical compound CC(C)(C)OC(=O)CCCCCCCCCCC(O)=O QFGCFKJIPBRJGM-UHFFFAOYSA-N 0.000 description 1
- GBURUDXSBYGPBL-UHFFFAOYSA-N 2,2,3-trimethylhexanedioic acid Chemical compound OC(=O)C(C)(C)C(C)CCC(O)=O GBURUDXSBYGPBL-UHFFFAOYSA-N 0.000 description 1
- TXTIIWDWHSZBRK-UHFFFAOYSA-N 2,4-diisocyanato-1-methylbenzene;2-ethyl-2-(hydroxymethyl)propane-1,3-diol Chemical compound CCC(CO)(CO)CO.CC1=CC=C(N=C=O)C=C1N=C=O TXTIIWDWHSZBRK-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- WKHQMLQPRWPUDP-UHFFFAOYSA-N 2-[2-[4-[2-[4-[2-(2-hydroxyethoxy)ethoxy]phenyl]propan-2-yl]phenoxy]ethoxy]ethanol Chemical compound C=1C=C(OCCOCCO)C=CC=1C(C)(C)C1=CC=C(OCCOCCO)C=C1 WKHQMLQPRWPUDP-UHFFFAOYSA-N 0.000 description 1
- MUHNBZQOTATUGE-UHFFFAOYSA-N 2-[4-[2-[4-(2-hydroxyethoxy)cyclohexyl]propan-2-yl]cyclohexyl]oxyethanol Chemical compound C1CC(OCCO)CCC1C(C)(C)C1CCC(OCCO)CC1 MUHNBZQOTATUGE-UHFFFAOYSA-N 0.000 description 1
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 1
- SZIFAVKTNFCBPC-UHFFFAOYSA-N 2-chloroethanol Chemical compound OCCCl SZIFAVKTNFCBPC-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- UUAGPGQUHZVJBQ-UHFFFAOYSA-N Bisphenol A bis(2-hydroxyethyl)ether Chemical compound C=1C=C(OCCO)C=CC=1C(C)(C)C1=CC=C(OCCO)C=C1 UUAGPGQUHZVJBQ-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 229920008347 Cellulose acetate propionate Polymers 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910020630 Co Ni Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002440 Co–Ni Inorganic materials 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- ALQSHHUCVQOPAS-UHFFFAOYSA-N Pentane-1,5-diol Chemical compound OCCCCCO ALQSHHUCVQOPAS-UHFFFAOYSA-N 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000011354 acetal resin Substances 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 230000001588 bifunctional effect Effects 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- OAWKUMDOADACKG-UHFFFAOYSA-N chloroethene;ethenyl acetate;prop-2-enoic acid Chemical compound ClC=C.OC(=O)C=C.CC(=O)OC=C OAWKUMDOADACKG-UHFFFAOYSA-N 0.000 description 1
- 229940090961 chromium dioxide Drugs 0.000 description 1
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 1
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical class C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- IFDVQVHZEKPUSC-UHFFFAOYSA-N cyclohex-3-ene-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCC=CC1C(O)=O IFDVQVHZEKPUSC-UHFFFAOYSA-N 0.000 description 1
- QSAWQNUELGIYBC-UHFFFAOYSA-N cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCCCC1C(O)=O QSAWQNUELGIYBC-UHFFFAOYSA-N 0.000 description 1
- RLMGYIOTPQVQJR-UHFFFAOYSA-N cyclohexane-1,3-diol Chemical compound OC1CCCC(O)C1 RLMGYIOTPQVQJR-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 125000002573 ethenylidene group Chemical group [*]=C=C([H])[H] 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000002483 hydrogen compounds Chemical class 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 1
- 229920001220 nitrocellulos Polymers 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
- 235000006408 oxalic acid Nutrition 0.000 description 1
- RPQRDASANLAFCM-UHFFFAOYSA-N oxiran-2-ylmethyl prop-2-enoate Chemical compound C=CC(=O)OCC1CO1 RPQRDASANLAFCM-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
- 239000003973 paint Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- XRVCFZPJAHWYTB-UHFFFAOYSA-N prenderol Chemical compound CCC(CC)(CO)CO XRVCFZPJAHWYTB-UHFFFAOYSA-N 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- UFDHBDMSHIXOKF-UHFFFAOYSA-N tetrahydrophthalic acid Natural products OC(=O)C1=C(C(O)=O)CCCC1 UFDHBDMSHIXOKF-UHFFFAOYSA-N 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 229920001567 vinyl ester resin Polymers 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
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はビデオテープ、オーディオテープ、コンピュー
ターテープ、およびフロンピーディスク等の磁気記録媒
体に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic recording media such as video tapes, audio tapes, computer tapes, and floppy disks.
現在、一般に広く使用されている磁気記録媒体は、結合
剤として塩ビー酢ビ系樹脂、塩ビー塩化ビニリデン系樹
脂、セルロース系樹脂、アセタール系樹脂、ウレタン樹
脂、アクリロニトリルブタジェン樹脂などの熱可塑性樹
脂を単独あるいは混合して用いる方法があるが、この方
法では、磁性層の耐摩耗性が劣り磁気テープの走行経路
を汚してしまうという欠点を有していた。Magnetic recording media that are currently widely used include thermoplastic resins such as vinyl chloride-vinylidene chloride resin, vinyl chloride vinylidene chloride resin, cellulose resin, acetal resin, urethane resin, acrylonitrile butadiene resin, etc. as a binder. There is a method of using these materials alone or in combination, but this method has the disadvantage that the abrasion resistance of the magnetic layer is poor and the running path of the magnetic tape is contaminated.
またメラミン樹脂、尿素樹脂等の熱硬化性樹脂を用いる
方法あるいは上記熱可塑性樹脂に化学反応による架橋性
の結合剤、たとえばイソシアネート化合物、エポキシ環
を有する化合物などを添加する方法が知られている。し
かし、上記の架橋性の結合剤を用いると、１）磁性粒子
を分散させた液の貯蔵安定性に難があり、磁性塗液物性
の均一性、ひいては磁気記録媒体の均質性を保持できな
い、２）塗布乾燥後塗膜の硬化のために熱処理工程が不
可欠であり、しかも長時間を要する、などの欠点を有し
ている。Also known are a method using a thermosetting resin such as a melamine resin or a urea resin, or a method in which a crosslinkable binder such as an isocyanate compound or a compound having an epoxy ring is added to the thermoplastic resin through a chemical reaction. However, when the above-mentioned crosslinking binder is used, 1) the storage stability of the liquid in which magnetic particles are dispersed is poor, and the uniformity of the physical properties of the magnetic coating liquid and, by extension, the homogeneity of the magnetic recording medium cannot be maintained; 2) A heat treatment step is essential for curing the coating film after coating and drying, and it has disadvantages such as requiring a long time.
これらの欠点を防止する為、アクリル酸エステル系のオ
リゴマーと千ツマ−を結合剤として用い、乾燥後に放射
線照射によって硬化せしめる磁気記録媒体の製造方法が
特公昭４７−１２４２３号、特開昭４７−１３６３９号
、特開昭４７−１５１０４号、特開昭５０−７７４３３
号、特開昭５６−２５２３１号等の各公報に開示されて
いる。しかしながら、上記特許公報に開示された製造方
法では高度な電磁変換特性と耐久性を有する磁気記録媒
体は得られなかった。In order to prevent these drawbacks, a method for manufacturing a magnetic recording medium using acrylic ester oligomers and sulfuric acid as a binder and curing it by irradiation with radiation after drying has been proposed in Japanese Patent Publication No. 12423/1983 and Japanese Patent Application Laid-Open No. 47-1989. No. 13639, JP-A-47-15104, JP-A-50-77433
No. 56-25231, Japanese Unexamined Patent Publication No. 56-25231, and other publications. However, with the manufacturing method disclosed in the above patent publication, a magnetic recording medium having high electromagnetic conversion characteristics and durability could not be obtained.
近年磁気記録媒体の高画質化が要求されている。 In recent years, there has been a demand for higher image quality in magnetic recording media.
このためには磁性層表面とビデオヘッド及びオーディオ
ヘッドとの間により密に接触させることが必要であり、
磁気記録媒体の表面の平滑性を向上させるとともに、強
磁性微粉末の分散性を更に飛躍的に向上させることが重
要である。一方磁性層表面が平滑になればなるほどビデ
オテープレコーダー内の走行系での摩擦は大きくなり、
走行テンションが高くなって、磁気記録媒体にはますま
す苛酷な走行耐久性が要求されるのである。このため、
従来の磁気記録媒体での製造方法では磁性層の表面の平
滑性、強磁性微粉末の分散性、および走行耐久性をかね
そなえた磁気記録媒体は得られていなかった。This requires closer contact between the magnetic layer surface and the video head and audio head.
It is important to improve the surface smoothness of the magnetic recording medium and to further dramatically improve the dispersibility of the ferromagnetic fine powder. On the other hand, the smoother the surface of the magnetic layer, the greater the friction in the running system inside the video tape recorder.
As running tension increases, magnetic recording media are required to have increasingly severe running durability. For this reason,
Conventional manufacturing methods for magnetic recording media have not yielded magnetic recording media that have the smoothness of the surface of the magnetic layer, the dispersibility of the ferromagnetic fine powder, and the running durability.
本発明者等は熱可塑性樹脂、熱硬化性樹脂を用いる方法
、及び上記の化学反応による架橋性の結合剤を添加する
方法、更に放射線架橋による硬化性結合剤を用いる方法
、などの従来技術の欠点を改良するため鋭意研究を重ね
た結果本発明に到達したものである。The present inventors have developed conventional techniques such as a method using a thermoplastic resin or a thermosetting resin, a method of adding a crosslinkable binder by the above-mentioned chemical reaction, and a method of using a hardenable binder by radiation crosslinking. The present invention was achieved as a result of intensive research to improve the drawbacks.
従って、本発明の目的は、従来の磁気記録媒体では達成
しえなかった特性、即ち１）電磁変換特性に優れ、２）
強磁性微粉末の分散性に優れ、３）磁性塗液の貯蔵安定
剤が良好で、均質な性能を有し、４）走行耐久性に優れ
、５）塗膜の硬化のための熱処理工程が不要な磁気記録
媒体を提供しようとすることである。Therefore, the objects of the present invention are to provide characteristics that could not be achieved with conventional magnetic recording media, namely: 1) excellent electromagnetic conversion characteristics; 2)
The ferromagnetic fine powder has excellent dispersibility, 3) the storage stabilizer for the magnetic coating liquid is good, and it has uniform performance, 4) it has excellent running durability, and 5) the heat treatment process for curing the coating film is The aim is to provide unnecessary magnetic recording media.
上記問題点は、
主として非磁性支持体と強磁性微粉末を含有する磁性層
とからなる磁気記録媒体において、該磁性層が、下記（
Ａ）および（Ｂ）
（Ａ）極性基および炭素炭素不飽和結合を分子中にそれ
ぞれ１個以上含み、極性基がＣｏ、Ｈ基である場合には
酸価１〜３０である、ポリ塩化ビニル系化合物
（Ｂ）Ｃｏ２Ｈ基および炭素炭素不飽和結合を分子中に
それぞれ１個以上含むポリウレタン系化合物
の化合物群のうちのそれぞれ１種以上の化合物と平均一
次粒子が１０〜２００ｍμのカーボンブランクとを含有
し、１×１０１０Ω以下の表面電気抵抗を有し、更に放
射線照射されていることを特徴とする磁気記録媒体によ
って解決されることが見出された。The problem mentioned above is that in a magnetic recording medium mainly consisting of a non-magnetic support and a magnetic layer containing fine ferromagnetic powder, the magnetic layer has the following (
A) and (B) (A) Polyvinyl chloride that contains one or more polar groups and one or more carbon-carbon unsaturated bonds in the molecule, and has an acid value of 1 to 30 when the polar group is a Co or H group. Compound (B) One or more compounds from the group of polyurethane compounds each containing one or more Co2H groups and one or more carbon-carbon unsaturated bonds in the molecule and a carbon blank with an average primary particle of 10 to 200 mμ. It has been found that the problem can be solved by a magnetic recording medium characterized by containing the above-mentioned problems, having a surface electrical resistance of 1×10 10 Ω or less, and further being irradiated with radiation.
即ち、本発明においては（Ａ）及び（Ｂ）の化合物群の
うちのそれぞれ１種以上を結合剤として含有し、さらに
特定のカーボンブランクを含有する上記特定磁性層を放
射線照射することにより、その相乗的効果によって上記
諸口的の達成された、とりわけ電磁変換特性、強磁性微
粉末の分散性及び走行耐久性の極めて優れた、磁気記録
媒体が得られるものである。That is, in the present invention, the specific magnetic layer containing one or more of the compound groups (A) and (B) as a binder and further containing a specific carbon blank is irradiated with radiation. The synergistic effect makes it possible to obtain a magnetic recording medium that achieves all of the above characteristics, particularly excellent in electromagnetic conversion characteristics, dispersibility of ferromagnetic fine powder, and running durability.
本発明において用いられる極性基および炭素炭素不飽和
結合を分子中にそれぞれ１個以上含むポリ塩化ビニル系
化合物（Ａ）としては、極性基としてＣｏ２Ｈ，０Ｈ１
Ｓ Ｏ３Ｈ，、Ｓ ０３ Ｎ ａ 、 ＯＰ ＣＬ＋
Ｈｌｏ Ｐ ０３ Ｎ ａ基などのうち少なくとも１種
以上の基と炭素炭素不飽和結合を含む塩化ビニル系重合
体、塩化ビニル−酢酸ビニル系共重合体、塩化ビニル−
プロピオン酸ビニル系共重合体、塩化ビニリデン−酢酸
ビニル系共重合体などの共重合体である。極性基として
好ましいものは、Ｃ０２Ｈ１ＯＨ基でありさらに好まし
くはＣＯ□）１基である。極性基がＣＯ２Ｈ基のとき、
ＣＯ□Ｉ］基含有量として酸価で１〜３０程度含むもの
が好ましく、更に好ましくは３〜２０であり最も好まし
くは５〜１５である。この範囲を外れると強磁性微粉末
の分散性が不良となり、また電磁変換特性も大幅に低下
する。炭素炭素不飽和結合の平均含有量としては、１分
子あたり１．５〜２０であり好ましくは２〜１５である
。分子量としては５゜０００〜５０．０００好ましくは
１０．０００〜３０．０００である。この範囲を外れる
と硬化性が不良になったりあるいは耐久性が悪くなった
りする。The polyvinyl chloride compound (A) containing one or more polar groups and one or more carbon-carbon unsaturated bonds in the molecule used in the present invention includes Co2H, 0H1 as polar groups.
S O3H,, S 03 Na, OP CL+
Vinyl chloride polymer containing at least one group such as Hlo P 03 Na group and a carbon-carbon unsaturated bond, vinyl chloride-vinyl acetate copolymer, vinyl chloride-
These are copolymers such as vinyl propionate copolymers and vinylidene chloride-vinyl acetate copolymers. A preferable polar group is a C02H1OH group, and more preferably a CO□)1 group. When the polar group is a CO2H group,
CO□I] group content is preferably about 1 to 30 in terms of acid value, more preferably 3 to 20, and most preferably 5 to 15. If it is outside this range, the dispersibility of the ferromagnetic fine powder will be poor and the electromagnetic conversion characteristics will also be significantly reduced. The average content of carbon-carbon unsaturated bonds is 1.5 to 20 per molecule, preferably 2 to 15. The molecular weight is 5.000 to 50.000, preferably 10.000 to 30.000. Outside this range, curing properties may be poor or durability may be poor.
これらの化合物は、ベースとなるポリ塩化ビニル系重合
体として、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−マレイン酸共重合体、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−ビニルアルコール共重合
体、塩化ビニル−プロピオン酸ビニル−マレイン酸ビニ
ル共重合体、塩化ビニル−プロピオン酸ビニル−ビニル
アルコール共重合体、塩化ビニリデン−酢酸ビニル−マ
レイン酸共重合体−塩化ビニリデン−プロピオン酸ビニ
ル−ビニルアルコール共重合体、塩化ビニル−酢酸ビニ
ル−アクリル酸共重合体、塩化ビニル−酢酸ビニル−ア
クリル酸−ビニルアルコール共重合体などの塩化ビニル
系共重合体、およびこれらの共重合体を鹸化して用いて
もよい。These compounds are based on polyvinyl chloride polymers such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, Vinyl chloride-vinyl acetate-maleic acid-vinyl alcohol copolymer, vinyl chloride-vinyl propionate-vinyl maleate copolymer, vinyl chloride-vinyl propionate-vinyl alcohol copolymer, vinylidene chloride-vinyl acetate-maleic acid Copolymers - vinyl chloride copolymers such as vinylidene chloride-vinyl propionate-vinyl alcohol copolymers, vinyl chloride-vinyl acetate-acrylic acid copolymers, vinyl chloride-vinyl acetate-acrylic acid-vinyl alcohol copolymers, etc. A combination or a copolymer thereof may be saponified and used.
炭素炭素不飽和結合の導入方法としては、これらの共重
合体のヒドロキシル基もしくはカルボキシル基の一部を
、あるいはケン化することによって生じたヒドロキシル
基の一部を変性することによって得ることができる。例
えばグリシジルアクリレートの如きエポキシ環と炭素炭
素不飽和結合を有する化合物をベースとなる重合体のヒ
ドロキシル基の一部と反応させたり、あるいは共重合体
のヒドロキシル基もしくはカルボキシル基の一部を多官
能イソシアネート（例えば、２．３４リレンジイソシア
ネート、２．６−４リレンジイソシアネート、１，３−
キシリレンジイソシアネート、１．４−キシリレンジイ
ソシアネート、１，５−ナフタレンジイソシアネート、
ｍ−フェニレンジイソシアネート、ｐ−フェニレンジイ
ソシアネート、３，３−ジメチルフェニレンジイソシア
ネート、４．４−ジフェニルメタンジイソシアネート、
３．３−ジメチル−４，４−ジフェニルメタンジイソシ
アネート、ヘキサメチレンジイソシアネート、イソホロ
ンジイソシアネート、ジシクロヘキシルメタンジイソシ
ア不一ト、トリメチロールフ。The carbon-carbon unsaturated bond can be introduced by modifying a part of the hydroxyl group or carboxyl group of these copolymers, or a part of the hydroxyl group generated by saponification. For example, a compound having an epoxy ring and a carbon-carbon unsaturated bond such as glycidyl acrylate is reacted with a part of the hydroxyl group of the base polymer, or a part of the hydroxyl group or carboxyl group of the copolymer is reacted with a polyfunctional isocyanate. (For example, 2.34 lylene diisocyanate, 2.6-4 lylene diisocyanate, 1,3-
xylylene diisocyanate, 1,4-xylylene diisocyanate, 1,5-naphthalene diisocyanate,
m-phenylene diisocyanate, p-phenylene diisocyanate, 3,3-dimethylphenylene diisocyanate, 4,4-diphenylmethane diisocyanate,
3.3-Dimethyl-4,4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, trimethylolf.
ロバンのトリレンジイソシアネート３付加物等）の１個
のＮＣＯ基と反応させ、残るＮＧＯ基を（メタ）アクリ
ロイル基（以下アクリロイル基、メタクリロイル基を総
称して（メタ）アクリロイル基とよぶ。）をもつ活性水
素化合物、例えば、（メタ）アクリル酸、２−ヒドロキ
シエチル（メタ）アクリレート、２−ヒドロキシプロピ
ル（メタ）アクリレート、２−ヒドロキシブチル（メタ
）アクリレートなどのヒドロキシアルキル（メタ）アク
リレート類、 （メタ）アクリルアミド、Ｎ−メチロー
ル（メタ）アクリルアミドなど、と反応させる方法によ
って得ることができる。The remaining NGO group is reacted with one NCO group of the tolylene diisocyanate triadduct of Roban, etc., and the remaining NGO group is converted into a (meth)acryloyl group (hereinafter, acryloyl group and methacryloyl group are collectively referred to as (meth)acryloyl group). ( It can be obtained by a method of reacting with meth)acrylamide, N-methylol(meth)acrylamide, etc.
また極性基を導入する方法としては、例えば次のような
方法を挙げることができる。上記のベースとなる共重合
体のヒドロキシル基もしくはカルボキシル基の一部を、
あるいは鹸化することによって生じたヒドロキシル基の
一部を多官能イソシアネートの１個のＮＧＯ基と反応さ
せ、残るＮＣＯ基をＣＯ２Ｈ基、５Ｏ３Ｎ２基、ＯＰ
Ｏ３Ｎ ａ基等を含有するヒドロキシル基化合物と反応
させることによって得ることができる。極性基の導入は
（メタ）アクリロイル基と同時に行うことも可能である
。あるいは極性基と（メタ）アクリロイル基を両方有す
る化合物を用いてもよい。これらの基の導入方法は前述
の方法に限定されるものではない。Furthermore, examples of methods for introducing polar groups include the following methods. A part of the hydroxyl group or carboxyl group of the above base copolymer,
Alternatively, a part of the hydroxyl group generated by saponification is reacted with one NGO group of a polyfunctional isocyanate, and the remaining NCO group is converted into CO2H group, 5O3N2 group, OP
It can be obtained by reacting with a hydroxyl group compound containing an O3N a group or the like. It is also possible to introduce the polar group simultaneously with the (meth)acryloyl group. Alternatively, a compound having both a polar group and a (meth)acryloyl group may be used. The method of introducing these groups is not limited to the above-mentioned method.
本発明で用いられるセルロース系（メタ）アクリレート
としては、セルロースナイトレート、セルロールアセテ
−１・ブチレート、セルロースアセナートプロピオネー
ト、セルロースジアセテ−１−などのＯＨ基を（メタ）
アクリロイル基に変性した樹脂が好ましい。好ましい範
囲としては、セルロースの重合度で５０〜４００、より
好ましくは８０〜２００である。この範囲を外れると磁
性塗液の粘度が高くなって分散性が悪化して好ましくな
い。またベースとなるセルロースとしては、安全性の面
からセルロースアセテートプロピオネート、セルロース
アセテートブチレートが好ましい。Cellulose-based (meth)acrylates used in the present invention include cellulose nitrate, cellulose acetate-1-butyrate, cellulose acenate-propionate, cellulose diacetate-1-, etc.
Resins modified with acryloyl groups are preferred. A preferable range is 50 to 400, more preferably 80 to 200 in terms of the degree of polymerization of cellulose. Outside this range, the viscosity of the magnetic coating liquid increases and the dispersibility deteriorates, which is not preferable. In addition, from the viewpoint of safety, cellulose acetate propionate and cellulose acetate butyrate are preferred as the base cellulose.
これらのセルロース類の（メタ）アクリレート化合物は
、例えばセルロース類をポリイソシアネート類と反応さ
せた後、さらに２−ヒドロキシエチルアクリレートなど
の前記（メタ）アクリロイル基を有する活性水素化合物
と反応させ、ＯＨ基を（メタ）アクリロイル化すること
によって得ることができる。These (meth)acrylate compounds of celluloses are produced by, for example, reacting cellulose with polyisocyanates and then reacting them with an active hydrogen compound having the above-mentioned (meth)acryloyl group such as 2-hydroxyethyl acrylate. It can be obtained by (meth)acryloylization of
本発明で用いられるＣＯ２Ｈ基および炭素炭素不飽和結
合を分子中にそれぞれ１個以上含むウレタン系化合物（
Ｂ）としては、主鎖の骨格がポリエステル、ポリエーテ
ル、ポリエステルエーテルのいずれでも良く、これらに
用いられる二塩基酸の具体例としてはしゅう酸、マロン
酸、コハク酸、グルタル酸、アジピン酸、セバシン酸、
ドデカン２酸、マレイン酸、フマル酸、イタコン酸、ト
リメチルアジピン酸、ヘキサヒドロフタル酸、テトラヒ
ドロフタル酸、フタル酸、イソフタル酸、テレフタル酸
、ナフタリンジカルボン酸などが使用できる。二価のア
ルコールとしては、エチレングリコール、トリメチレン
ゲコール、テトラメチレングリコール、ペンタメチレン
グリコール、ヘキサメチレングリコール１、オククメチ
レングリコール、ジエチレングリコール、トリエチレン
グリコール１、テトラエチレングリコール、２．２−ジ
メチルプロパン−１，３−ジオール、２，２−ジエチル
プロパン−１，３−ジオール、シクロヘキサン−１，３
−ジオール、シクロヘキサン−１゜４−ジオール、シク
ロヘキサン−１，４〜ジメタツール、シクロヘキサン−
１，３−ジメタツール、２．２−ビス（４−ヒドロキシ
エトキシ−シクロヘキシル）プロパン、２．２−ビス（
４−ヒドロキシエトキシ−フェニル）プロパン、２，２
−ビス（４−ヒドロキシエトキシエトキシ−フェニル）
プロパンなどが使用できる。また、γ−ブチロラクトン
、δ−バレロラクトン、ε−カプロラクトンなどによる
ラクトン系のポリエステル骨格を用いることも可能であ
る。ウレタン結合を形成するイソイアナートとしては、
２． ４−）リレンジイソシアネート、２．６−）リレ
ンジイソシアネート、１，３−キシリレンジイソシアネ
ート、■。Urethane compounds containing one or more CO2H groups and one or more carbon-carbon unsaturated bonds in the molecule used in the present invention (
As B), the main chain skeleton may be polyester, polyether, or polyester ether, and specific examples of dibasic acids used in these are oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, and sebacic acid. acid,
Dodecanedioic acid, maleic acid, fumaric acid, itaconic acid, trimethyladipic acid, hexahydrophthalic acid, tetrahydrophthalic acid, phthalic acid, isophthalic acid, terephthalic acid, naphthalene dicarboxylic acid, and the like can be used. Examples of dihydric alcohols include ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol 1, occumethylene glycol, diethylene glycol, triethylene glycol 1, tetraethylene glycol, and 2,2-dimethylpropane. 1,3-diol, 2,2-diethylpropane-1,3-diol, cyclohexane-1,3
-Diol, cyclohexane-1゜4-diol, cyclohexane-1,4-dimetatool, cyclohexane-
1,3-dimethator, 2,2-bis(4-hydroxyethoxy-cyclohexyl)propane, 2,2-bis(
4-hydroxyethoxy-phenyl)propane, 2,2
-bis(4-hydroxyethoxyethoxy-phenyl)
Propane etc. can be used. It is also possible to use a lactone-based polyester skeleton made of γ-butyrolactone, δ-valerolactone, ε-caprolactone, or the like. Isoyanates that form urethane bonds include:
2. 4-) lylene diisocyanate, 2.6-) lylene diisocyanate, 1,3-xylylene diisocyanate, ■.
４−キシリレンジイソシアネート、１，５−ナフタレン
ジイソシアネート、ｍ−フェニレンジイソシアネート、
ｐ−フェニレンジイソシアネート３．３−ジメチルフェ
ニレンジイソシアネート、４．４−ジフェニルメタンジ
イソシアネート、３゜３−ジメチル−４，４−ジフェニ
ルメタンジイソシアネートへキサメチレンジイソシアネ
ートイソホロンジイソシアネート、ジシクロヘキシルメ
タンジイソシアネート、トリメチロールプロパンのトリ
レンジイソシアネート３付加物などの多価イソシアネー
トを使用できる。また前記二塩基酸、二価アルコールの
一部を３価以上の酸及びアルコールに置き替えてもよい
。Ｃ０２Ｈ基及び炭素炭素二重結合、好ましくは（メタ
）アクリロイル基、はポリウレタンの末端にあっても側
鎖にあってもよい。これらの基の導入の方法としては、
１）３価以上の酸、アルコール、イソシアネートの一種
以上をウレタン骨格に組み込み、側鎖にＣＯ２Ｈ基、Ｏ
Ｈ基もしくはＮＧＯ基を残留するウレタンに、これらの
基と反応しうるカルボン酸化合物および（メタ）アクリ
ロイル化合物を反応させたり、２）末端にイソシアネー
ト基を有するウレタンにＣｏ２Ｈ基と（メタ）アクリロ
イル基およびＯ）−１基をそれぞれ１つ以上有する活性
水素化合物を反応させたりすることなどによって得られ
る。 本発明で用いるウレタン系化合物の好ましい酸価
としては１〜３０であり、より好ましくは３〜２０であ
り更に好ましくは５〜１５である。4-xylylene diisocyanate, 1,5-naphthalene diisocyanate, m-phenylene diisocyanate,
p-phenylene diisocyanate 3.3-dimethylphenylene diisocyanate, 4.4-diphenylmethane diisocyanate, 3゜3-dimethyl-4,4-diphenylmethane diisocyanate hexamethylene diisocyanate isophorone diisocyanate, dicyclohexylmethane diisocyanate, trimethylolpropane tolylene diisocyanate 3 Polyvalent isocyanates such as adducts can be used. Further, a part of the dibasic acid and dihydric alcohol may be replaced with trivalent or higher acid and alcohol. The C02H group and the carbon-carbon double bond, preferably the (meth)acryloyl group, may be at the end or in the side chain of the polyurethane. The methods for introducing these groups are as follows:
1) One or more types of trivalent or higher acids, alcohols, and isocyanates are incorporated into the urethane skeleton, and CO2H groups and O
2) Reacting urethane with residual H or NGO groups with a carboxylic acid compound and (meth)acryloyl compound that can react with these groups, or 2) reacting Co2H group and (meth)acryloyl group with urethane having isocyanate groups at the terminals. and O)-1 groups, by reacting active hydrogen compounds each having one or more. The acid value of the urethane compound used in the present invention is preferably 1 to 30, more preferably 3 to 20, and still more preferably 5 to 15.
分子量としては１．０００〜１００，０００であり、好
ましくは２，０００〜５０，０００特に好ましくは３．
０００〜３０，０００である。酸価がこの範囲を外れる
と強磁性微粉末の分散性が悪く、電磁変換特性の低下を
招いたり、耐久性が悪化したりする。また（メタ）アク
リロイル基の平均含有量としては１分子あたり１．５〜
１ｏであり好ましくは２〜８である。The molecular weight is 1.000-100,000, preferably 2,000-50,000, particularly preferably 3.000-100,000.
000 to 30,000. If the acid value is out of this range, the dispersibility of the ferromagnetic fine powder will be poor, leading to a decrease in electromagnetic conversion characteristics and deterioration in durability. In addition, the average content of (meth)acryloyl groups is 1.5 to 1 per molecule.
1o, preferably 2-8.
分子量が１０００未満の場合、得られた磁気記録媒体の
磁性層が強くなりすぎ、折曲げたときに割れがはいった
り、また放射線照射後硬化収縮により磁気記録媒体がカ
ールするという問題が発生しやすい。一方分子量カ月ｏ
ｏ、ｏｏｏを越えるとウレタン（メタ）アクリレートの
溶剤への溶解性が不良となりやすく、取扱に不便となる
のみでなく、磁性体の分散性が悪化したり硬化に多大な
エネルギーを必要とするので好ましくない。When the molecular weight is less than 1000, the magnetic layer of the obtained magnetic recording medium becomes too strong, which tends to cause cracks when bent, and the magnetic recording medium tends to curl due to curing shrinkage after irradiation with radiation. . On the other hand, molecular weight o
If it exceeds o or ooo, the solubility of the urethane (meth)acrylate in the solvent tends to be poor, which not only makes handling inconvenient, but also deteriorates the dispersibility of the magnetic material and requires a large amount of energy for curing. Undesirable.
更に本発明にはビニル系モノマーを添加するこｑ
とができる。ビニル系モノマーとしては、放射線照射に
より重合可能な化合物であって、炭素−炭素不飽和結合
を分子中に１個以上有する化合物であり、（メタ）アク
リル酸エステル類、（メタ）アクリルアミド類、アリル
化合物、ビニルエーテル類、ビニルエステル類、ビニル
異部環化合物、Ｎ−ビニル化合物、スチレン類、アクリ
ル酸、メタクリル酸、クロトン酸類、イタコン酸類、オ
レフィン類等が例としてあげられる。これらのうち好ま
しいものとしてメタクリロイル基を２個以上含む下記の
化合物があげられる。具体的には、ジエチレングリコー
ルジ（メタ）アクリレート、トリエチレングリコールジ
（メタ）アクリレート、テトラエチレングリコールジ（
メタ）アクリレートなどのポリエチレングリコールの（
メタ）アクリレート類、トリメチロールプロパントリ
（メタ）アクリレート、ペンタエリスリト−ルテトう（
メタ）アクリレート、ジペンタエリスリトールペンタ
（メタ）アクリレート、シヘンタエリスリトールヘキ
サ（メタ）アクリレート、ｌ・リス（β−（メタ）アク
リロイロキシエチル）イソシアヌレート、ヒス（β−（
メタ）アクリロイロキシエチル）イソシアヌレート、
あるいはポリイソシアネート（２，４−トリレンジイソ
シアネート、２゜６−トリレンジイソシアネート、１，
３−キシリレンジイソシアネート、１，４−キシリレン
ジイソシアネート、１，５−ナフタレンジイソシアネー
ト、ｍ−フェニレンジイソシアネート、ｐ−フェニレン
ジイソシアネート、３．３−ジメチルフェニレンジイソ
シアネート、４．４−ジフェニルメタンイソシアネート
、３，３−ジメチル−４゜４−ジフェニルメタンジイソ
シアネート、ヘキサメチレンジイソシアネート、イソホ
ロンジイソシアネート、ジシクロへキシルメタンジイソ
シアネート、トリメチロールプロパンのトリレンジイソ
シアネート３付加物）と、ヒドロキシ（メタ）アクリレ
ート化合物（２−ヒドロキシエチル（メタ）アクリレー
ト、２−ヒドロキシプロピル（メタ）アクリレートなど
）との反応化合物、あるいはその他の２官能以上のポリ
（メタ）アクリレート類などがある。これらのモノマ
ーは１種でもよく、また２種以上用いてもよい。Furthermore, a vinyl monomer can be added to the present invention. Vinyl monomers include compounds that can be polymerized by radiation irradiation and have one or more carbon-carbon unsaturated bonds in the molecule, such as (meth)acrylic esters, (meth)acrylamides, allyl Examples include vinyl ethers, vinyl esters, vinyl heterocyclic compounds, N-vinyl compounds, styrenes, acrylic acid, methacrylic acid, crotonic acids, itaconic acids, and olefins. Among these, preferred are the following compounds containing two or more methacryloyl groups. Specifically, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate,
of polyethylene glycols such as meth)acrylates (
meth)acrylates, trimethylolpropane tri
(meth)acrylate, pentaerythritol (
meth)acrylate, dipentaerythritol penta
(meth)acrylate, cyhentaerythritol hexa(meth)acrylate, l.lis(β-(meth)acryloyloxyethyl)isocyanurate, his(β-(
meth)acryloyloxyethyl)isocyanurate,
Or polyisocyanate (2,4-tolylene diisocyanate, 2゜6-tolylene diisocyanate, 1,
3-xylylene diisocyanate, 1,4-xylylene diisocyanate, 1,5-naphthalene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 3.3-dimethylphenylene diisocyanate, 4.4-diphenylmethane isocyanate, 3,3- Dimethyl-4゜4-diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, tolylene diisocyanate 3 adduct of trimethylolpropane) and hydroxy (meth)acrylate compound (2-hydroxyethyl (meth)acrylate) , 2-hydroxypropyl (meth)acrylate, etc.), and other bifunctional or higher functional poly(meth)acrylates. These monomers may be used alone or in combination of two or more.
前記（Ａ）で示される化合物と前記（Ｂ）で示される化
合物との組成比の好ましい範囲は２０〜９０重量部／８
０−１０重量部、特に好ましくは３０〜８０部／７０〜
２０部である。（Ａ） Ｔ：示される化合物がこの比率
以下であったり、（Ｂ）で示される化合物がこの比率以
下であると耐久性が得られない。また、前記ビニルモノ
マーの添加量は前記（Ａ）および（Ｂ）で示される化合
物の総和重量部に対して５０重量部以下が好ましい。The preferred composition ratio of the compound represented by (A) and the compound represented by (B) is 20 to 90 parts by weight/8.
0-10 parts by weight, particularly preferably 30-80 parts/70-
There are 20 copies. (A) T: If the indicated compound is below this ratio, or the compound indicated by (B) is below this ratio, durability cannot be obtained. Further, the amount of the vinyl monomer added is preferably 50 parts by weight or less based on the total parts by weight of the compounds represented by (A) and (B).
この比率よりも多いと重合に必要な放射線量が大きくな
って好ましくないし、磁気記録媒体がカールしたり、あ
るいは十分な耐久性かえられない。If the ratio is higher than this, the amount of radiation required for polymerization becomes undesirable, and the magnetic recording medium may curl or may not have sufficient durability.
カーボンブランクとしては、平均−次粒子サイズが１０
〜２００ｍμのものが好ましく、特に好ましくは１０〜
Ｌｏｏｍμのものである。また、粒子サイズの異なる２
種以上のカーボンブランクを添加してもよい。The carbon blank has an average particle size of 10
~200 mμ is preferred, particularly preferably 10 ~
It is from Loomμ. In addition, two particles with different particle sizes
More than one type of carbon blank may be added.
粒子サイズが上記範囲を超えると表面電気抵抗を低下さ
せる効率が減少し、塗液分散性が悪化する傾向を示す。When the particle size exceeds the above range, the efficiency of reducing surface electrical resistance decreases, and coating liquid dispersibility tends to deteriorate.
一方、上記範囲より小さいと磁性層の耐久性が劣化する
。On the other hand, if it is smaller than the above range, the durability of the magnetic layer will deteriorate.
添加量としては、強磁性微粉末１００重量部に対して０
． ５〜２０重量部が好ましく、より好ましくは１〜１
０重量部である。添加量が少ないと走行安定性が悪くな
り、また反対に多いと、強磁性微粉末の磁性層中の充填
度が低下し、かつ塗膜表面性も低下するので電磁変換特
性が悪化する。The amount added is 0 to 100 parts by weight of ferromagnetic fine powder.
．． 5 to 20 parts by weight is preferable, more preferably 1 to 1 part by weight.
It is 0 parts by weight. If the amount added is too small, the running stability will deteriorate, while if it is added too much, the degree of filling of the ferromagnetic fine powder in the magnetic layer will be reduced, and the surface properties of the coating will also be reduced, resulting in deterioration of the electromagnetic characteristics.
本発明に用いられる強磁性微粉末としては、強磁性酸化
鉄微粉末、Ｃｏドープの強磁性酸化鉄微粉末、ｉＭｌ磁
性二酸化クロり徽わ）末、強磁性合金粉末、バリウムフ
ェライトなどが使用できる。強磁性酸化鉄、二酸化クロ
ムの針状比は、２／１〜２０／１程度、好ましくは５／
１以上平均長は０゜２〜２．０μｍ程度の範囲が有効で
ある。強磁性合金粉末は金属分が７５ｗｔ％以上であり
、金属分の８０ｗｔ％以上が強磁性金属（即ぢ、Ｆｅ、
Ｃ０１Ｎｉ、、Ｆｅ−Ｎｉ、、Ｃｏ−Ｎｉ、Ｆｅ−Ｃ。As the ferromagnetic fine powder used in the present invention, ferromagnetic iron oxide fine powder, Co-doped ferromagnetic iron oxide fine powder, iMl magnetic chloride dioxide powder, ferromagnetic alloy powder, barium ferrite, etc. can be used. . The acicular ratio of ferromagnetic iron oxide and chromium dioxide is about 2/1 to 20/1, preferably 5/1.
It is effective that the average length of 1 or more is in the range of about 0°2 to 2.0 μm. The ferromagnetic alloy powder has a metal content of 75 wt% or more, and 80 wt% or more of the metal content is a ferromagnetic metal (i.e., Fe,
C01Ni, ,Fe-Ni, ,Co-Ni, Fe-C.
−Ｎｉ）で長径が約１．０μｍ以下の粒子である。-Ni) with a major axis of about 1.0 μm or less.
本発明に於いて特に効果的なのは強磁性微粉末の分散が
困難なり、ＥＴ比表面積が３０、好ましくは４５％／ｇ
以上の微粒子の強磁性合金粉末である。Particularly effective in the present invention is that the ferromagnetic fine powder is difficult to disperse and the ET specific surface area is 30%/g, preferably 45%/g.
The above fine particle ferromagnetic alloy powder.
分散、磁性塗液の塗布に用いる有機溶剤としては、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；エチルエーテル、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、テトラヒドロフランなどのエーテル系；ヘ
ンゼン、トルエン、キシレンなどの芳香族炭化水素；メ
チレンクロライド、エチレンクロライ「、四塩化炭素、
クロロホルム、エヂレンクロルヒドリン、ジクロルヘン
ゼンなどの塩素化炭化水素等が選択して使用できる。Organic solvents used for dispersion and application of magnetic coating liquid include acetone, methyl ethyl ketone, methyl isobutyl ketone,
Ketones such as cyclohexanone; esters such as methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, acetic acid glycol monoethyl ether; ethyl ether, glycol dimethyl ether, glycol monoethyl ether,
Ethers such as dioxane and tetrahydrofuran; aromatic hydrocarbons such as henzene, toluene, and xylene; methylene chloride, ethylene chloride, carbon tetrachloride,
Chlorinated hydrocarbons such as chloroform, ethylene chlorohydrin, and dichlorohenzene can be selected and used.
また、本発明の磁性塗液には、潤滑剤、研磨剤、分散剤
、帯電防止剤、防錆剤等の添加剤を加えてもよい。特に
潤滑剤は、炭素数１２以上の飽和及び不飽和の高級脂肪
酸、脂肪酸エステル、高級脂肪酸アミド、高級アルコー
ルおよび、シリコーンオイル、鉱油、植物油、フッソ系
化合物等があり、これらは磁性塗液調製時に添加しても
よく、また乾燥後あるいは放射線照射後に有機溶剤に溶
解して、あるいはそのまま磁性層表面に塗布あるいは、
噴霧してもよい。Further, additives such as a lubricant, an abrasive, a dispersant, an antistatic agent, and a rust preventive may be added to the magnetic coating liquid of the present invention. In particular, lubricants include saturated and unsaturated higher fatty acids with 12 or more carbon atoms, fatty acid esters, higher fatty acid amides, higher alcohols, silicone oils, mineral oils, vegetable oils, fluorine compounds, etc., and these are used when preparing magnetic coating liquids. It may be added, or it may be dissolved in an organic solvent after drying or irradiation with radiation, or applied directly to the surface of the magnetic layer, or
May be sprayed.
本発明の磁性層は１×１０１０Ω以下の表面電気抵抗を
有することが必要である。上記範囲を超えると、塵埃等
の付着量が増大し、またドロップアウトの増大をひきお
こす傾向がある。また電気抵抗の下限はとくに限定的で
はなく、好ましくは１×１０５Ω以上である。The magnetic layer of the present invention needs to have a surface electrical resistance of 1×10 10 Ω or less. If the above range is exceeded, the amount of adhesion of dust and the like increases, and there is a tendency to cause an increase in dropouts. Further, the lower limit of the electrical resistance is not particularly limited, and is preferably 1×10 5 Ω or more.
磁性塗液を塗布する支持体の素材としては、ポリエチレ
ンテレフタレート、ポリエチレン２，６−ナフタレート
などのポリエステル類、ポリエチレン、ポリプロピレン
などのポリオレフィン類、セルローストリアセテートな
どのセルロース誘導体、ポリカーボネート、ポリイミド
、ポリアミドイミドなどプラスチック、その他に用途に
応してアルミニウム、銅、錫、亜鉛又はこれらを含む非
磁性合金などの非磁性金属類、アルミニウムなどの金属
を蒸着したプラスチック類も使用できる。Materials for the support to which the magnetic coating liquid is applied include polyesters such as polyethylene terephthalate and polyethylene 2,6-naphthalate, polyolefins such as polyethylene and polypropylene, cellulose derivatives such as cellulose triacetate, and plastics such as polycarbonate, polyimide, and polyamideimide. In addition, non-magnetic metals such as aluminum, copper, tin, zinc, or non-magnetic alloys containing these metals, and plastics on which metals such as aluminum are vapor-deposited may also be used, depending on the purpose.
また非磁性支持体の形態はフィルム、テープ、シート、
ディスク、カード、ドラムなどいずれでもよく、形態に
応じて種々の材料が必要に応じて選択される。In addition, the forms of non-magnetic supports include films, tapes, sheets,
It may be a disk, card, drum, etc., and various materials are selected depending on the form as necessary.
また本発明の支持体は帯電防止、転写防止、ワウフラッ
タ−防止、磁気記録媒体の強度向上、バンク面のマント
化等の目的で、磁性層を設けた側の反対の面（バック面
）にいわゆるバックコートがなされていてもよい。In addition, the support of the present invention has a so-called back surface on the side opposite to the side on which the magnetic layer is provided for the purpose of preventing static electricity, preventing transfer, preventing wow and flutter, improving the strength of magnetic recording media, and forming a cloak on the bank surface. A back coat may be provided.
本発明では放射線を、磁性塗料を塗布し、カレンダー処
理を施した後に照射することが好ましいが、照射した後
カレンダー処理することも可能である。あるいは更にも
う一度放射線照射することも可能である。In the present invention, it is preferable to irradiate radiation after applying a magnetic paint and performing calender treatment, but it is also possible to perform calender treatment after irradiation. Alternatively, it is also possible to irradiate one more time.
本発明の磁性層に照射する放射線としては、電子線、γ
線、β線、紫外線などを使用できるが、好ましくは電子
線である。電子線加速器としてはスキャニング方式、ダ
ブルスキャニング方式あるいはカーテンビーム方式、ブ
ロードビームカーテン方式などが採用できる。電子線と
しては、加速電圧が１００〜１００ＯＫＶ、好ましくは
１５０〜３００ＫＶであり、吸収線量として１〜２０Ｍ
ｒａｄ、好ましくは３〜１５Ｍｒａｄである。加速電圧
力月００ＫＶ以上の場合は、エネルギーの透過量が不足
し、１００ＯＫＶを超えると重合に使われるエネルギー
効率が低下し経済的で無い。The radiation irradiated to the magnetic layer of the present invention includes electron beam, γ
Although rays, β rays, ultraviolet rays, etc. can be used, electron beams are preferable. As the electron beam accelerator, a scanning method, double scanning method, curtain beam method, broad beam curtain method, etc. can be adopted. As for the electron beam, the accelerating voltage is 100 to 100 OKV, preferably 150 to 300 KV, and the absorbed dose is 1 to 20 M.
rad, preferably 3 to 15 Mrad. If the accelerating voltage exceeds 00 KV per month, the amount of energy transmitted will be insufficient, and if it exceeds 100 KV, the energy efficiency used for polymerization will decrease, making it uneconomical.
吸収線量として、Ｉ Ｍ ｒ ａ ｄ以下では硬化反応
が不充分で磁性層強度が得られず、２０ Ｍ ｒ ａ
ｄ以上になると、硬化に使用されるエネルギー効率が低
下したり、被照射体が発熱し、特にプラスティック支持
体が変形するので好ましくない。If the absorbed dose is less than 20 M r a d, the curing reaction will be insufficient and the strength of the magnetic layer will not be obtained.
If it exceeds d, the energy efficiency used for curing decreases, the irradiated object generates heat, and especially the plastic support deforms, which is not preferable.
以下に本発明を実施例及び比較例により更に具体的に説
明する。以下の実施例及び比較例において「部」はすべ
て「重量部」を示す。The present invention will be explained in more detail below using Examples and Comparative Examples. In the following Examples and Comparative Examples, all "parts" indicate "parts by weight."
実施例 １ 下記組成の磁性塗液をボールミルで５０時間混練した。Example 1 A magnetic coating liquid having the following composition was kneaded in a ball mill for 50 hours.
Ｆ’ｅ−Ｎｉ合金粉末（１３０００Ｑ、ＢＥＴ表面積
４６ｍ／ｇ、Ｎｉ、ｌ Ｑｗｔ％）４００部
結合剤組成
塩化ビニル共重合体系アクリレート ６０部（酸価１
０、分子量２０，０００、アクリロイル基平均含有量２
．８個／分子）
ウレタンアクリレート ４０部（酸価
１０、分子量１０，０００、アクリロイル基平均含有量
３個／分子）
ステアリン酸 ４部ブチルス
テアレート ４部α−Ａ１２０３
４部カーボンブラック（別表記載の
もの）別表記載の量
メチルエチルケトン ８００部分散後１
厚さ１０μｍのポリエチレンテレフタレート支持体に、
ドクターブレードを用いて乾燥膜が３μｍになるように
塗布しコバルト磁石を用いて配向させたのち、溶剤を乾
燥（１００℃１分間）後カレンダー処理を施した。次い
で加速電圧１６５ＫＶ、ビーム電流６ｍＡで７ Ｍ ｒ
ａ ｄの吸収線量になるように電子線を照射した後、
Ｉ／２インチ幅にスリットしてビデオ用磁気テープサン
プルＮｏ、１〜４を作成した。F'e-Ni alloy powder (13000Q, BET surface area
46m/g, Ni, l Qwt%) 400 parts Binder composition Vinyl chloride copolymer based acrylate 60 parts (Acid value 1
0, molecular weight 20,000, average acryloyl group content 2
．． 8 pieces/molecule) Urethane acrylate 40 parts (acid value 10, molecular weight 10,000, average acryloyl group content 3 pieces/molecule) Stearic acid 4 parts Butyl stearate 4 parts α-A1203
4 parts Carbon black (as listed in the attached table) Quantity listed in the attached table Methyl ethyl ketone 800 parts After dispersion 1
On a polyethylene terephthalate support with a thickness of 10 μm,
The film was coated using a doctor blade so that the dry film had a thickness of 3 μm and oriented using a cobalt magnet. After drying the solvent (1 minute at 100° C.), a calender treatment was performed. Then, the acceleration voltage was 165 KV and the beam current was 6 mA for 7 M r.
After irradiating the electron beam to an absorbed dose of a d,
Video magnetic tape samples Nos. 1 to 4 were prepared by slitting them to a width of 1/2 inch.
その結果を別表に示す。The results are shown in the attached table.
実施例２
結合剤組成のみを下記のものに代えた以外は全て実施例
１と同様にしてビデオ用磁気テープサンプルＮｏ、５及
び６を作成した。Example 2 Video magnetic tape samples Nos. 5 and 6 were prepared in the same manner as in Example 1 except that only the binder composition was changed to the one shown below.
（結合剤組成）
塩ビ系共重合体アクリレ−１−６０部
（酸価０． ５、分子１１３，０００）ウレタンアクリ
レート ４０部（酸価９、分子量１２
，０００、アクリロイル基平均含有量３個／分子）
その結果を別表に示す。(Binder composition) PVC copolymer acrylate - 1-60 parts (acid value 0.5, molecular weight 113,000) Urethane acrylate 40 parts (acid value 9, molecular weight 12
,000, average acryloyl group content 3/molecule) The results are shown in the attached table.
評価方法
酸価の測定試料１ｇをテトラヒドロフランに溶解しフェ
ノールフタレンを指示薬として、水酸化カリウムのエチ
ルアルコール−水（９５１５Ｖ／■％）溶液で滴定し、
要した水酸化カリウムの回数を酸価とした。Evaluation method: Measurement of acid value. Dissolve 1 g of the sample in tetrahydrofuran and titrate it with a solution of potassium hydroxide in ethyl alcohol-water (9515V/■%) using phenolphthalene as an indicator.
The number of times of potassium hydroxide required was defined as the acid value.
最大磁束密度（Ｂｍ）； ＶＳＭ （振動式 Ｂ−Ｈメ
ーター）を用いて、外部磁場１０ＫＯｅにて測定した。Maximum magnetic flux density (Bm): Measured using a VSM (vibrating B-H meter) with an external magnetic field of 10 KOe.
ドロップアウト数（Ｄ、Ｏ）；テープスタートから１０
分間についてドロップアウト数をカウントした。Number of dropouts (D, O); 10 from tape start
The number of dropouts was counted per minute.
スチル耐久性：ＶＨＳビデオテープレコーダー（松下電
器産業（株）製、ＮＶ８２００）を用いてビデオテープ
（各サンプル）に一定のビデオ信号を記録し、再生した
制止画像が鮮明さを失うまでの時間を示す（実験は５℃
８０％ＲＨで行った）。Still durability: A constant video signal is recorded on a videotape (each sample) using a VHS video tape recorder (manufactured by Matsushita Electric Industrial Co., Ltd., NV8200), and the time until the reproduced still image loses its sharpness is measured. (Experiment at 5℃
(performed at 80% RH).
Ｓ／Ｎ：上記ビデオテープレコーダーを使用し、５０％
セットアンプの灰色信号を録画し、シバツク製９２５Ｃ
型Ｓ／Ｎメーターでノイズを測定し、サンプルＮｏ、１
をＯｄＢとしたときの相対値で示した。S/N: 50% using the above video tape recorder
Record the gray signal of the set amplifier and use Shibatsu 925C.
Measure the noise with a model S/N meter, sample No. 1
It is expressed as a relative value when it is expressed as OdB.
（発明の効果）
本発明の磁気記録媒体は、良好な電磁変換特性を示し、
強磁性微粉末の分散性がよく、また走行耐久性に優れて
いることが判る。(Effects of the invention) The magnetic recording medium of the invention exhibits good electromagnetic conversion characteristics,
It can be seen that the ferromagnetic fine powder has good dispersibility and excellent running durability.
手続補正書 昭和６２年５月ンＱ日Procedural amendment May 1986 Q-day
Claims (4)
磁性層とからなる磁気記録媒体において、該磁性層が、
下記（Ａ）および（Ｂ） （Ａ）極性基および炭素炭素不飽和結合 を分子中にそれぞれ１個以上含み、極性基がＣＯ＿２Ｈ
基である場合には酸価１〜３０である、ポリ塩化ビニル
系化合物 （Ｂ）ＣＯ＿２Ｈ基および炭素炭素不飽和 結合を分子中にそれぞれ１個以上含むポリウレタン系化
合物 の化合物群のうちのそれぞれ１種以上の化合物と平均一
次粒子サイズが１０〜２００ｍμのカーボンブラックと
を含有し、１×１０＾１＾０Ω以下の表面電気抵抗を有
し、更に放射線照射されていることを特徴とする磁気記
録媒体。(1) In a magnetic recording medium mainly consisting of a non-magnetic support and a magnetic layer containing fine ferromagnetic powder, the magnetic layer
The following (A) and (B) (A) Each molecule contains one or more polar groups and one or more carbon-carbon unsaturated bonds, and the polar group is CO_2H.
polyvinyl chloride compounds (B) each having one or more CO_2H groups and one or more carbon-carbon unsaturated bonds in the molecule, each of which has an acid value of 1 to 30 when it is a group of polyurethane compounds. Magnetic recording comprising at least one compound and carbon black having an average primary particle size of 10 to 200 mμ, having a surface electrical resistance of 1×10^1^0Ω or less, and further being irradiated with radiation. Medium.
Ｏ＿２Ｈ基を含むものである特許請求の範囲第１項記載
の磁気記録媒体。(2) The polyvinyl chloride compound (A) has C as a polar group.
The magnetic recording medium according to claim 1, which contains an O_2H group.
リウレタン（メタ）アクリレートである特許請求の範囲
第１項記載の磁気記録媒体。(3) The magnetic recording medium according to claim 1, wherein the polyurethane compound (B) is a polyurethane (meth)acrylate having an acid value of 1 to 30.
以上の強磁性合金粉末である特許請求の範囲第１項記載
の磁気記録媒体。(4) The ferromagnetic fine powder has a BET specific surface area of 30 m^2/g
The magnetic recording medium according to claim 1, which is the above ferromagnetic alloy powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9689186A JPS62256219A (en) | 1986-04-28 | 1986-04-28 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9689186A JPS62256219A (en) | 1986-04-28 | 1986-04-28 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62256219A true JPS62256219A (en) | 1987-11-07 |
Family
ID=14177003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9689186A Pending JPS62256219A (en) | 1986-04-28 | 1986-04-28 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62256219A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01267828A (en) * | 1988-04-19 | 1989-10-25 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| EP0373856A2 (en) * | 1988-12-12 | 1990-06-20 | Konica Corporation | A magnetic recording medium |
| US5314514A (en) * | 1992-05-13 | 1994-05-24 | Fuji Photo Film Co., Ltd. | Abrasive tape |
| EP0710951A1 (en) | 1994-10-14 | 1996-05-08 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| EP0717396A1 (en) | 1994-12-16 | 1996-06-19 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| EP0797190A1 (en) | 1992-01-08 | 1997-09-24 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| USRE36271E (en) * | 1988-02-12 | 1999-08-17 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6548160B2 (en) | 1999-12-01 | 2003-04-15 | Fuji Photo Film Co., Ltd. | Magnetic recording media |
| EP2001014A2 (en) | 2007-05-31 | 2008-12-10 | FUJIFILM Corporation | Magnetic signal reproduction system and magnetic signal reproduction method |
| EP2234106A1 (en) | 2009-03-27 | 2010-09-29 | Fujifilm Corporation | Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method |
| EP2237273A1 (en) | 2009-03-31 | 2010-10-06 | FUJIFILM Corporation | Magnetic tape cartridge |
| EP3192353A1 (en) | 2016-01-12 | 2017-07-19 | FUJIFILM Corporation | Magnetic sheet for plant cultivation and method of plant cultivation |
-
1986
- 1986-04-28 JP JP9689186A patent/JPS62256219A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE36271E (en) * | 1988-02-12 | 1999-08-17 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| JPH01267828A (en) * | 1988-04-19 | 1989-10-25 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| EP0373856A2 (en) * | 1988-12-12 | 1990-06-20 | Konica Corporation | A magnetic recording medium |
| EP0797190A1 (en) | 1992-01-08 | 1997-09-24 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5314514A (en) * | 1992-05-13 | 1994-05-24 | Fuji Photo Film Co., Ltd. | Abrasive tape |
| EP0710951A1 (en) | 1994-10-14 | 1996-05-08 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| EP0717396A1 (en) | 1994-12-16 | 1996-06-19 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6548160B2 (en) | 1999-12-01 | 2003-04-15 | Fuji Photo Film Co., Ltd. | Magnetic recording media |
| EP2001014A2 (en) | 2007-05-31 | 2008-12-10 | FUJIFILM Corporation | Magnetic signal reproduction system and magnetic signal reproduction method |
| EP2234106A1 (en) | 2009-03-27 | 2010-09-29 | Fujifilm Corporation | Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method |
| EP2237273A1 (en) | 2009-03-31 | 2010-10-06 | FUJIFILM Corporation | Magnetic tape cartridge |
| EP3192353A1 (en) | 2016-01-12 | 2017-07-19 | FUJIFILM Corporation | Magnetic sheet for plant cultivation and method of plant cultivation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4560616A (en) | Magnetic recording medium having binder cured by electron beam radiation | |
| JPS5897132A (en) | Manufacture for magnetic recording member | |
| US4547419A (en) | Magnetic recording medium | |
| JPS62256219A (en) | Magnetic recording medium | |
| JPS62103845A (en) | Magnetic recording medium | |
| US4591528A (en) | Magnetic recording medium | |
| US4959263A (en) | Magnetic recording medium | |
| US4976989A (en) | Method for preparing a magnetic recording medium | |
| US4690870A (en) | Magnetic recording medium | |
| JPS5930233A (en) | Magnetic recording medium | |
| US4699844A (en) | Magnetic recording medium | |
| US4621027A (en) | Magnetic recording medium | |
| JPH0533447B2 (en) | ||
| JPS63279420A (en) | Magnetic recording medium | |
| US4672002A (en) | Magnetic recording medium | |
| JPS62256221A (en) | Magnetic recording medium | |
| JPS62103846A (en) | Magnetic recording medium | |
| JPS62256220A (en) | Magnetic recording medium | |
| JPH02192012A (en) | Magnetic recording medium | |
| JPH0721852B2 (en) | Magnetic recording medium | |
| JPS6284423A (en) | Magnetic recording medium | |
| JPS6214323A (en) | Magnetic recording medium | |
| JPS6214324A (en) | Magnetic recording medium | |
| JPS6284422A (en) | Magnetic recording medium | |
| JPS62205521A (en) | Magnetic recording medium |