JPH0253220A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0253220A JPH0253220A JP20333588A JP20333588A JPH0253220A JP H0253220 A JPH0253220 A JP H0253220A JP 20333588 A JP20333588 A JP 20333588A JP 20333588 A JP20333588 A JP 20333588A JP H0253220 A JPH0253220 A JP H0253220A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic layer
- magnetic
- recording medium
- magnetic recording
- ester compound
- 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 115
- -1 ester compounds Chemical class 0.000 claims abstract description 68
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 7
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 3
- 239000011230 binding agent Substances 0.000 claims description 24
- 230000005294 ferromagnetic effect Effects 0.000 claims description 21
- 239000000843 powder Substances 0.000 claims description 21
- 229920005989 resin Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 125000004432 carbon atom Chemical group C* 0.000 claims description 7
- 230000000717 retained effect Effects 0.000 claims description 7
- 239000010409 thin film Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 abstract description 15
- 125000003158 alcohol group Chemical group 0.000 abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 9
- 238000009835 boiling Methods 0.000 abstract 1
- 238000005461 lubrication Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 56
- 238000000034 method Methods 0.000 description 18
- 235000014113 dietary fatty acids Nutrition 0.000 description 11
- 239000000194 fatty acid Substances 0.000 description 11
- 229930195729 fatty acid Natural products 0.000 description 11
- 239000000314 lubricant Substances 0.000 description 10
- 239000010954 inorganic particle Substances 0.000 description 8
- 239000010408 film Substances 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 150000004665 fatty acids Chemical class 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000003973 paint Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 239000002216 antistatic agent Substances 0.000 description 5
- 239000002270 dispersing agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 150000002148 esters Chemical class 0.000 description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 5
- 235000021317 phosphate Nutrition 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- NVIVJPRCKQTWLY-UHFFFAOYSA-N cobalt nickel Chemical compound [Co][Ni][Co] NVIVJPRCKQTWLY-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Chemical group OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical class C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 229940116224 behenate Drugs 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-M behenate Chemical compound CCCCCCCCCCCCCCCCCCCCCC([O-])=O UKMSUNONTOPOIO-UHFFFAOYSA-M 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-M dodecanoate Chemical compound CCCCCCCCCCCC([O-])=O POULHZVOKOAJMA-UHFFFAOYSA-M 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 229940070765 laurate Drugs 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229940105132 myristate Drugs 0.000 description 2
- 229940049964 oleate Drugs 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
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- 229920000728 polyester Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- TUNFSRHWOTWDNC-UHFFFAOYSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 2
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 description 1
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- DHKHKXVYLBGOIT-UHFFFAOYSA-N 1,1-Diethoxyethane Chemical compound CCOC(C)OCC DHKHKXVYLBGOIT-UHFFFAOYSA-N 0.000 description 1
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- LGEZTMRIZWCDLW-UHFFFAOYSA-N 14-methylpentadecyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCCCCCCCCCCC(C)C LGEZTMRIZWCDLW-UHFFFAOYSA-N 0.000 description 1
- WPIOBXGJZUSKGK-UHFFFAOYSA-N 16-methylheptadecyl dodecanoate Chemical compound CCCCCCCCCCCC(=O)OCCCCCCCCCCCCCCCC(C)C WPIOBXGJZUSKGK-UHFFFAOYSA-N 0.000 description 1
- SAMYFBLRCRWESN-UHFFFAOYSA-N 16-methylheptadecyl hexadecanoate Chemical compound CCCCCCCCCCCCCCCC(=O)OCCCCCCCCCCCCCCCC(C)C SAMYFBLRCRWESN-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
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- WGWFHNRYFAWIKA-UHFFFAOYSA-N 2-methyltricosan-10-yl dodecanoate Chemical compound CCCCCCCCCCCCCC(CCCCCCCC(C)C)OC(=O)CCCCCCCCCCC WGWFHNRYFAWIKA-UHFFFAOYSA-N 0.000 description 1
- UOBYKYZJUGYBDK-UHFFFAOYSA-N 2-naphthoic acid Chemical compound C1=CC=CC2=CC(C(=O)O)=CC=C21 UOBYKYZJUGYBDK-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
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- DCXXMTOCNZCJGO-UHFFFAOYSA-N Glycerol trioctadecanoate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 description 1
- CTKINSOISVBQLD-UHFFFAOYSA-N Glycidol Chemical compound OCC1CO1 CTKINSOISVBQLD-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000011354 acetal resin Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001408 amides Chemical group 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical group 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- HDRXZJPWHTXQRI-BHDTVMLSSA-N diltiazem hydrochloride Chemical compound [Cl-].C1=CC(OC)=CC=C1[C@H]1[C@@H](OC(C)=O)C(=O)N(CC[NH+](C)C)C2=CC=CC=C2S1 HDRXZJPWHTXQRI-BHDTVMLSSA-N 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910001337 iron nitride Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 229940113915 isostearyl palmitate Drugs 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006247 magnetic powder 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- WSGCRAOTEDLMFQ-UHFFFAOYSA-N nonan-5-one Chemical compound CCCCC(=O)CCCC WSGCRAOTEDLMFQ-UHFFFAOYSA-N 0.000 description 1
- UTOPWMOLSKOLTQ-UHFFFAOYSA-M octacosanoate Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC([O-])=O UTOPWMOLSKOLTQ-UHFFFAOYSA-M 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical class [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
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 125000005496 phosphonium group Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000233 poly(alkylene oxides) Polymers 0.000 description 1
- 229920005670 poly(ethylene-vinyl chloride) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 150000004671 saturated fatty acids Chemical class 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
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- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
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- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、非磁性支持体上に強磁性粉末及び結合剤樹脂
を主体とする磁性層又は強磁性金属薄膜である磁性層を
設けた磁気記録媒体に関(7、特に広範囲の温湿度条件
下における走行耐久性が優れ次磁気記録媒体に関するも
のである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic material in which a magnetic layer consisting mainly of ferromagnetic powder and binder resin or a magnetic layer consisting of a ferromagnetic metal thin film is provided on a non-magnetic support. Regarding recording media (7), it relates to magnetic recording media that have particularly excellent running durability under a wide range of temperature and humidity conditions.
磁気記録の高記録密度化にともなって、磁性層の表面性
はより平滑になりそのために走行中における磁性層と記
録再生装置内の各部品との摩擦係数が増大し磁気記録媒
体の円滑な走行が阻害されたり、磁性層が損傷される等
の問題が顕著になってき九。As the recording density of magnetic recording increases, the surface properties of the magnetic layer become smoother, which increases the coefficient of friction between the magnetic layer and each component in the recording/reproducing device during running, making it difficult for the magnetic recording medium to run smoothly. Problems such as interference with magnetic fields and damage to the magnetic layer are becoming more prominent9.
このような問題を改良するために従来から磁性層中に脂
肪酸エステルを添加する方法(特開昭jO−−−403
号公報、特開昭jrO−/!JりOj号公報、特開昭j
j−/Jり637号公報、特公昭39−21347号公
報、特公昭グ/−itθぶ5号公報、特公昭弘7−7−
910号公報)、シリコーン化合物を添加する方法(U
SJ 4 jμ617)、脂肪酸や炭化水素を添加する
方法等が提案され試みられてきた。In order to improve this problem, a method of adding fatty acid ester to the magnetic layer has been proposed (Japanese Patent Application Laid-Open No. 2003-110000-403).
Publication, JP-A-Sho jrO-/! Jri Oj Publication, JP-A Shoj
j-/Jri No. 637, Special Publication No. 39-21347, Special Publication Shogu/-itθbu No. 5, Special Publication No. 7-7-7-
910), a method of adding a silicone compound (U
SJ 4 jμ617), methods of adding fatty acids and hydrocarbons, etc. have been proposed and attempted.
サラに、近年VTR、パーソナルコンビュータワー ド
ロセッサー等が一般民生用機器として普及するようにな
って磁気記録媒体の使用条件、なかでも温湿度条件が広
範囲に渡るようになってきた。そして、ノe−ソナルコ
ンピュータやワードロセツサー等に使用されるフロンピ
ーディスク等の回転記録媒体のように磁性層に対してヘ
ッドのオンオフを数多く繰り返される方式に使用される
ので、特に、高温下、あるいは高温から低温せでの温度
サイクルが長時間続けられる状態では前記の磁気記録媒
体の走行耐久性の問題は一層大きな問題となって@た。In recent years, as VTRs, personal viewing towers, processors, and the like have become popular as general consumer equipment, the conditions under which magnetic recording media are used, particularly the temperature and humidity conditions, have become more widespread. Since it is used in rotating recording media such as floppy disks used in electronic computers and word processors, where the head is repeatedly turned on and off with respect to the magnetic layer, it is especially suitable for use under high temperatures or Under conditions where the temperature cycle from high temperature to low temperature continues for a long time, the problem of running durability of the magnetic recording medium becomes even more serious.
しかしながら、従来のこれらの技術においては前記添加
物が高温度下では磁性層表面から揮発し易かったり、一
方低温度下では磁性層表面に析出してヘッドの目詰まり
やドロップ・アウト増大の原因となる等の問題があった
。′1次、効果を期待して添加量を多くすると結合剤樹
脂を可塑化し7て磁性層の膜強度を弱めて耐久性をむし
ろ低下させてしまう等の問題もあった。However, in these conventional technologies, the additives tend to volatilize from the surface of the magnetic layer at high temperatures, while at low temperatures they precipitate on the surface of the magnetic layer, causing head clogging and increased dropouts. There were some problems. First, if the amount added is increased with the expectation of an effect, there is a problem that the binder resin becomes plasticized, which weakens the film strength of the magnetic layer and actually reduces the durability.
また、走行耐久性を向上させるための別の対策としては
、磁性層中に研磨剤を(硬度の高い粒子)添加する方法
が提案され実施されているが、磁性層の中に効果が充分
に現れるほど加えるにはかなり多量に添加せねばならず
、電磁変換特性の低下やヘッド磨耗の増大という問題が
でてきた、また、以上の問題を解決するために高温下で
は磁性層から揮発しK<<、低温下では磁性層費面に析
出することがないように高分子量でかつ分岐した炭化水
素基あるいは不飽和炭化水素基を有しまた脂肪酸エステ
ルを磁性層に添加する方法が%開昭5r−itoμ−!
号公報、%開昭1t−J/7031号公報、特開昭40
−.201127号公報、特開昭t/−、291463
7号公報、特開昭tJ−/、2jj−2号公報に開示さ
れている。しかしこれらのエステルは常温で液状であり
結合剤樹脂と相溶し易く結合剤樹脂を可塑(ヒする結果
磁性層の膜強度を低下才ゼいずれも充分な効果が得られ
ていない。ま九、潤滑性も分岐したアルキル基を有する
エステル化合物では充分ではなかった。In addition, as another measure to improve running durability, a method of adding abrasives (highly hard particles) into the magnetic layer has been proposed and implemented; In order to add K to the extent that it appears, it must be added in a fairly large amount, resulting in problems such as deterioration of electromagnetic conversion characteristics and increased wear on the head. <<The method of adding a fatty acid ester to the magnetic layer, which has a high molecular weight and has a branched hydrocarbon group or an unsaturated hydrocarbon group, so that it does not precipitate on the magnetic layer surface at low temperatures, has been developed. 5r-itoμ-!
Publication No. 1977-J/7031, Japanese Unexamined Patent Publication No. 1973
−. Publication No. 201127, Japanese Unexamined Patent Publication No. 201127, 291463
This method is disclosed in Japanese Patent Application Publication No. 7, Japanese Patent Application Laid-open No. 2JJ-2. However, these esters are liquid at room temperature and are easily compatible with the binder resin, plasticizing the binder resin and reducing the film strength of the magnetic layer. Ester compounds having branched alkyl groups also had insufficient lubricity.
一方、潤滑性は比較的優れている直鎖のアルキル基を有
するエステル化合物であると融点が高いものが多く前記
の低温下では磁性層表面に析出するという問題をしばし
ば引き起こした。On the other hand, many ester compounds having a linear alkyl group, which have relatively good lubricity, have a high melting point, which often causes the problem of precipitation on the surface of the magnetic layer at such low temperatures.
また別な方法として低融点の脂肪酸エステルと高融点の
脂肪酸エステルとを併用する方法が特開昭47一−タ参
≦37号公報、流動パラフィンと7タル酸エステルとを
併用する方法が等会昭≦O−≠タタ7.2号公報にそれ
ぞれ開示されているがいずれも前述の問題を解決するに
は充分であるとはいえなかった。Another method is to use a combination of a fatty acid ester with a low melting point and a fatty acid ester with a high melting point, as disclosed in Japanese Unexamined Patent Application Publication No. 471-37. Although these methods are disclosed in Sho≦O−≠Tata No. 7.2, none of them can be said to be sufficient to solve the above-mentioned problems.
以、ヒ述べた従来の技術の問題は 強磁性金属薄膜を磁
性層とする磁気記録媒体にあっても同じであり、%開昭
jj−43YOP号公報、特開昭乙J−IJYJ1号公
報、%開昭乙J=I3910号公報及び特開昭63−a
3弘−13号公報等に開示されfc種々の技術が提案さ
れているが、近時の広い環境条件下における定行耐久性
の要求に充分応えきれないのが現状であった。The problems of the conventional techniques mentioned above are the same even in magnetic recording media whose magnetic layer is a ferromagnetic metal thin film. % Kaisho Otsu J = Publication No. I3910 and JP 63-a
Although various fc technologies have been proposed as disclosed in Publication No. 3-13, etc., the current situation is that they cannot sufficiently meet the demands for constant running durability under a wide range of environmental conditions.
本発明は上記の従来技術の問題点を改良する為になされ
たものであり、広範囲の環境条件下で走行耐久性の優れ
た磁気記録媒体を機器することを目的としている。The present invention has been made in order to improve the problems of the prior art described above, and aims to provide a magnetic recording medium that has excellent running durability under a wide range of environmental conditions.
C問題点を解決するための手段〕
本発明の目的は、非磁性支持体上に磁性層を有する磁気
記録媒体において、下記一般式(1)で示されるエステ
ル化合物の少なくとも/記を該磁性層中又は該磁性層の
上に保持したことを特徴とする磁気記録媒体。Means for Solving Problem C] An object of the present invention is to provide a magnetic recording medium having a magnetic layer on a non-magnetic support, in which at least one of the ester compounds represented by the following general formula (1) is added to the magnetic layer. A magnetic recording medium, characterized in that the magnetic recording medium is held in or on the magnetic layer.
(ただし、Roは、炭素数7乃至−タの直鎖又は分岐の
アルキル基又はアルケニル基
n、 mは、整数であって、nは一以一ヒ、nとmの和
は7乃至33である。)により達成される。(However, Ro is a linear or branched alkyl group or alkenyl group having 7 to 5 carbon atoms, n and m are integers, n is 1 to 1, and the sum of n and m is 7 to 33. ) is achieved.
本発明における前記の一般式(1)で示されるエステル
化合物は、そのアルコール部に分岐したメチル基を有す
る分岐構造であるが、従来の他の分岐があるエステル化
合物に比較して潤滑性が優れている。1.た、融点もエ
ステル化合物としては比較的高((−10”C乃至tj
’cのエステル化合物が多い、、)高温度の環境条件下
であっても磁気記録媒体の磁性層表面から揮散しにくい
。また、結合剤樹脂との親和性は比較的小さく結合剤樹
脂を可塑化する恐れも少ないし、従って磁性層中にあっ
ては結合剤樹脂中に捕られれて磁性層表面で潤滑剤とし
て作用する分が少なくなるというようなことも起こりに
くい、前記の一般式(1)で示されるエステル化合物に
は、以上のような特徴がおるのでそれを用いた本発明の
磁気記録媒体は高温度から低温度まで広範囲の環境条件
下で優れた走行耐久性を示す。The ester compound represented by the general formula (1) in the present invention has a branched structure having a branched methyl group in its alcohol moiety, but has superior lubricity compared to other conventional ester compounds with branches. ing. 1. In addition, the melting point is relatively high for an ester compound ((-10"C to tj
Contains many ester compounds of 'c', etc.) It is difficult to volatilize from the surface of the magnetic layer of the magnetic recording medium even under high temperature environmental conditions. In addition, its affinity with the binder resin is relatively low, so there is little risk of plasticizing the binder resin, and therefore, in the magnetic layer, it is trapped in the binder resin and acts as a lubricant on the surface of the magnetic layer. Since the ester compound represented by the general formula (1) has the above-mentioned characteristics, the magnetic recording medium of the present invention using the ester compound is unlikely to cause a decrease in the amount of the compound. It exhibits excellent running durability under a wide range of environmental conditions, including temperatures.
上述した前記一般式(1)で示されるエステル化合物の
%徴は、その分子構造に由来するものであって、ひとつ
にはアルコール部がメチルの分岐を有しかつnは1以上
でnとmの和は7乃至33の適度の大きさのアルキル基
であることによる。The % characteristic of the ester compound represented by the above-mentioned general formula (1) is derived from its molecular structure, and one reason is that the alcohol moiety has a methyl branch and n is 1 or more, and n and m This is due to the sum of 7 to 33 moderately sized alkyl groups.
本発明の前記エステル化合物のアルコール部のメチル分
岐の位置は/分子内に7つちればよい。また、メチル分
岐の位置の異なるアルコールのエステル化合物を混在さ
せても良い。この場合、アルコール部のアルキル鎖の中
央にメチル分岐を有するものを主成分としてメチル分岐
位置の異なるアルコール部が正規分布に近い分布をする
ように混在させたものが市販されており、
とが望ましい。また、炭素数の異なるアルコール部を有
するエステル化合物を混在させても良い。The number of methyl branches in the alcohol moiety of the ester compound of the present invention may be seven in one molecule. Furthermore, ester compounds of alcohols having different methyl branch positions may be mixed. In this case, there are commercially available alcohol moieties that have a methyl branch at the center of the alkyl chain as the main component, and alcohol moieties with different methyl branch positions are mixed so as to have a distribution close to a normal distribution, and it is desirable that . Furthermore, ester compounds having alcohol moieties having different numbers of carbon atoms may be mixed.
nとmの和は、7乃至33であり望ましくはり乃至72
である。nとmの和がこの範囲外であると例えば、小さ
い場合、潤滑性が充分でなく、太きい場合はヘッドはり
つきの原因になったりして好ましくない。The sum of n and m is between 7 and 33, preferably between 72 and 72.
It is. If the sum of n and m is outside this range, for example, if it is small, the lubricity will not be sufficient, and if it is thick, it will cause the head to stick, which is undesirable.
さらに、本発明においては、前記エステル化合物の酸部
(R)の大きさも重要であり、Rいは、炭素数7乃至J
2であることが望ましく、特に望ましくは/l乃至ココ
でおる。Roの炭素数がこの範囲よりも少ないと潤滑性
が低下し、また逆にこの範囲を越えてもff14滑性が
低下してしまいいずれも本発明の目的を充分に達成する
ことができなくなる。Furthermore, in the present invention, the size of the acid moiety (R) of the ester compound is also important;
It is desirable that it be 2, particularly preferably from /l to here. If the number of carbon atoms in Ro is less than this range, the lubricity decreases, and conversely, if it exceeds this range, the ff14 lubricity decreases, making it impossible to fully achieve the object of the present invention.
広範囲の環境条件において潤滑性の優れた磁気記録媒体
が得られるという本発明の特徴は、前記の一般式(I)
で示されるエステル化合物のアルコール部及び脂肪酸部
が適度の炭素数であることそしてアルコール部がメチル
分岐の構造を有するという従来の磁気記録媒体用潤滑剤
では知られていなかった特有の分子構造でおることに起
因している。The feature of the present invention is that a magnetic recording medium with excellent lubricity can be obtained under a wide range of environmental conditions.
The alcohol moiety and fatty acid moiety of the ester compound represented by the formula have a suitable number of carbon atoms, and the alcohol moiety has a methyl branched structure, which is a unique molecular structure not known in conventional lubricants for magnetic recording media. This is due to this.
前記エステル化合物の原料アルコールなま、例t。Raw alcohol raw material for the ester compound, Example t.
ば、J、Am、Oil、Chem、Soc 、ly、
!、2j(/27≠)に記載があるメチル分岐脂肪酸を
アルコール化することにより得ることができる。B, J, Am, Oil, Chem, Soc, ly,
! , 2j (/27≠) can be obtained by alcoholizing the methyl branched fatty acid described in .
本発明で用いるエステル化合物としては、例えば、ラウ
リン酸イソデシルテトラデシル、ラウリン酸インミリス
プル、ラウリン駿イソステアリル、ラウリン酸インウン
デシル、ミリスチン酸イソルルミチル、ミリスチン酸イ
ソ(ヘニル、)ξルミチン酸イソパルミチル、ノミルミ
チン酸イソステアリル、オレイン酸インステアリル、オ
レイン酸〜イソノモルミテル、ステアリン散イソミリス
チル、ステアリン酸イソパルミチル、ステアリン酸イン
ステアリル、ステアリン酸インベヘニル、ベヘン酸イン
ミリスチル、ベヘン酸インステアリル、モンタン酸イン
ミリスチル、モンタ〉′酸イソステアリル等である。(
尚、ここでいうインとは、メチル分岐のことをいう。)
中でも、ステアリン酸インステアリル、パルミチン酸イ
ソステアリルが特に望ましい。Examples of the ester compounds used in the present invention include isodecyltetradecyl laurate, imirispur laurate, isostearyl laurate, inundecyl laurate, isollumityl myristate, iso(henyl myristate,)ξisopalmityl rumitate, isomyrmitate Stearyl, instearyl oleate, isonomormiter oleate, isomyristyl stearin, isopalmityl stearate, instearyl stearate, inbehenyl stearate, inmyristyl behenate, instearyl behenate, immyristyl montanate, isomontanate Stearyl etc. (
Note that in here refers to a methyl branch. )
Among these, instearyl stearate and isostearyl palmitate are particularly desirable.
本発明において、前記エステル化合物の使用量は塗布型
磁性層中に保持する場合、通常強磁性粉末に対して、/
乃至13重量%であり、望ましくは−乃至10重量%で
ある。ま之、塗布型磁性層でも金属薄膜型磁気記録媒体
の磁性層の表面に保持させる場合はくいわゆるトップコ
ート)−乃至!Orq/m である。使用量がこの範
囲を越えて多くなると、磁性ノー表面におけるエステル
化合物の量が過剰となって、はりつき等の故障を起こす
ばかりでなく、磁性層中に保持させた場合等は結合剤樹
脂を可塑化して、磁性層の膜質を弱め、走行耐久性をむ
しろ低下させてしまう。逆にこの範囲をT1わると充分
な潤滑効果が得られなくなる。In the present invention, when the ester compound is retained in the coating type magnetic layer, the amount of the ester compound used is usually /
The amount is from 13% to 13% by weight, preferably from 1% to 10% by weight. However, even if the coated magnetic layer is retained on the surface of the magnetic layer of a metal thin film magnetic recording medium, the so-called top coat) -~! Orq/m. If the amount used exceeds this range, the amount of ester compound on the magnetic surface becomes excessive, which not only causes problems such as sticking, but also causes the binder resin to become plastic when retained in the magnetic layer. This weakens the film quality of the magnetic layer and actually reduces running durability. Conversely, if this range is exceeded by T1, a sufficient lubricating effect cannot be obtained.
本発明において、磁性層が強磁性金属薄膜である場合は
通常磁性ノーの表面に紡記エステル化合物トツゾU−ト
する。その方法としては例えば、炭化水素エステル、ケ
トン、エーテル系等の有機溶剤に前記エステル化合物を
溶解してその溶液を磁性層表面上に塗布して、乾燥する
。その他、ラングミュアプロジェット膜法等も適用でき
る。In the present invention, when the magnetic layer is a ferromagnetic metal thin film, a spinning ester compound is usually applied to the surface of the magnetic layer. For example, the ester compound is dissolved in an organic solvent such as a hydrocarbon ester, ketone, or ether, and the solution is applied onto the surface of the magnetic layer and dried. In addition, the Langmuir-Projet membrane method can also be applied.
本発明において、強磁性粉末と結合剤樹脂を主体とする
磁性層である場合でおってもエステル化合物を保持させ
る方法としては、磁性層に含有させる方法と表面にトッ
プコート(材料を有機溶剤に溶解して基板に塗布あるい
は噴霧したのち乾燥する方法、材料を熔融して基板に塗
着させる方法、有機溶剤に材料を溶解した溶液に基板を
浸漬して材料を基板表面に吸着させる方法、ラングミュ
ア−プロジェット法などによる)する方法等も採用でき
る。In the present invention, methods for retaining the ester compound even in the case where the magnetic layer is mainly composed of ferromagnetic powder and binder resin include a method of incorporating it into the magnetic layer and a method of adding a top coat to the surface (using the material in an organic solvent). A method in which the material is melted and applied or sprayed onto a substrate and then dried, a method in which the material is melted and applied to the substrate, a method in which the substrate is immersed in a solution of the material in an organic solvent and the material is adsorbed to the substrate surface, Langmuir - Methods such as the Projet method can also be adopted.
本発明においては、従来から使用されてきた他の潤滑剤
を混在させてもよい。In the present invention, other lubricants that have been conventionally used may be mixed.
併用できる潤滑剤としては、飽和、不飽和の脂肪酸(ミ
リスチン酸、ステアリン酸、オレイン酸等)金属石鹸、
脂肪酸アミド、本発明に該当しない脂肪酸エステル(各
攬モノエステルをはじめソルビタン、グリセリン等多価
エステルの脂肪酸エステル、多塩基酸のエステル化物等
)、高級脂肪族アルコール、モノアルキルフォスフ・エ
ート、ジアルキルフォスフェート、トリアルキルフォス
フェート、ノミラフイン類、シリコーンオイル、動植物
油、鉱油、腐縁脂肪族アミン;グラファイト、シ;)カ
、二硫化モリブデン、二硫化タングステン等の無機微粉
末;ポリエチレン、ポリプロピレン、ポリ塩化ビニル、
エチレン−塩化ビニル共重合体、ポリテ)・ラフルオロ
エチレン等の樹脂微粉末;αオレフ・イン重合物;常温
で液体の不飽和脂肪族炭化水素、フルオロカーボン類等
があげられる。Lubricants that can be used in combination include saturated and unsaturated fatty acids (myristic acid, stearic acid, oleic acid, etc.), metal soaps,
Fatty acid amides, fatty acid esters not falling under the present invention (including various monoesters, fatty acid esters of polyhydric esters such as sorbitan and glycerin, esters of polybasic acids, etc.), higher aliphatic alcohols, monoalkyl phosphates, dialkyl Inorganic fine powders such as phosphates, trialkyl phosphates, fluorophores, silicone oils, animal and vegetable oils, mineral oils, corrugated aliphatic amines; graphite, molybdenum disulfide, tungsten disulfide; polyethylene, polypropylene, polyester, etc. vinyl chloride,
Examples include fine resin powders such as ethylene-vinyl chloride copolymer, polytetrafluoroethylene, etc.; α-olefin polymers; unsaturated aliphatic hydrocarbons and fluorocarbons that are liquid at room temperature.
これらつ混在潤滑剤の好ましい使用量は使用態様によっ
て様々だが、おおむね、本発明のエステル化合物の17
io、−一倍の使用量である。The preferred amount of these mixed lubricants varies depending on the mode of use, but in general, the amount of the ester compound of the present invention is
io, -1 times the usage amount.
本発明で、強磁性粉末と結合剤樹脂を主体とする磁性層
である場合に使用される強磁性粉末に特に制限はない。In the present invention, there is no particular restriction on the ferromagnetic powder used when the magnetic layer is mainly composed of ferromagnetic powder and binder resin.
強磁性合金粉末、r−Fe203、Fe 304、Co
変性酸化鉄、Co 02、窒化鉄の地変性バリウムフェ
ライトおよび変性ストロンチウムフェライト等を挙ける
ことができる。Ferromagnetic alloy powder, r-Fe203, Fe 304, Co
Examples include modified iron oxide, Co02, modified barium ferrite of iron nitride, and modified strontium ferrite.
強磁性粉末の形状に特に制限はないが通常は、針状、粒
状、サイコロ状、米粒状および板状のものなどが使用さ
れる。この強磁性粉末の比表面積は、/(1)FFI/
S’以上が電磁変換特性上好ましい。There is no particular restriction on the shape of the ferromagnetic powder, but needle-like, granular, dice-like, rice-grain-like, and plate-like shapes are usually used. The specific surface area of this ferromagnetic powder is /(1)FFI/
S' or more is preferable in terms of electromagnetic conversion characteristics.
磁性層を形成する結合剤は通常の結合剤から選ぶことが
できる。結合剤の例としては、塩化ビニル・酢酸ビニル
共重合体、塩化ビニル、酢酸ビニルとビニルアルコール
、マレイン酸および/−L’Cはアクリル酸との共重合
体、塩化ビニル・塩化ビニリデン共重合体、塩化ビニル
・アクリロニトリル共重合体、エチレン・酢酸ビニル共
重合体、ニトロセスロース樹脂などのセルロース誘導体
、アクリル樹脂、ポリビニルアセタール樹脂、ポリビニ
ルブチラール樹脂、エポキシ樹脂、フェノキシ樹脂、ポ
リウレタン樹脂、ポリカーゼネートポリウレタン樹脂等
を挙げることができる。分散性・耐久性を更に高めるた
めに以上列挙の結合剤分子中に、極性基(エポキシ基、
C02)1.(JHlNH803M、US(J3M、P
O3M2、一
0 P 03 M 2%ただしMは水素、アルカリ金属
またはアンモニウムであり、一つの基の中に複数のMが
あるときは互いに異なっていてもよい)を導入したもの
が好ましい。極性基の含有量としてはポリマー7グラム
当り70 〜10−4当量が好ましい範囲でおる。The binder forming the magnetic layer can be selected from conventional binders. Examples of binders include vinyl chloride/vinyl acetate copolymer, vinyl chloride, vinyl acetate and vinyl alcohol, maleic acid and/-L'C is a copolymer with acrylic acid, vinyl chloride/vinylidene chloride copolymer. , vinyl chloride/acrylonitrile copolymer, ethylene/vinyl acetate copolymer, cellulose derivatives such as nitrocellulose resin, acrylic resin, polyvinyl acetal resin, polyvinyl butyral resin, epoxy resin, phenoxy resin, polyurethane resin, polycarbonate polyurethane Examples include resins and the like. In order to further improve dispersibility and durability, polar groups (epoxy groups,
C02)1. (JHlNH803M, US (J3M, P
O3M2, 10 P 03 M 2% However, M is hydrogen, an alkali metal, or ammonium, and when there is a plurality of M in one group, they may be different from each other) are preferably introduced. The preferred content of polar groups is 70 to 10@-4 equivalents per 7 grams of polymer.
以上列挙の高分子結合剤は単独または数種混合で使用さ
れ、しばしばインシアネート系の公知の架橋剤を添加し
て硬化処理される。The polymeric binders listed above may be used alone or in combination, and are often cured by adding a known incyanate crosslinking agent.
また、アクリル酸エステル系のオリゴマーと、モノマー
を結合剤として用い、放射線照射によって硬化する結合
剤系にも、本発明のエステル化合物は適用される。The ester compound of the present invention is also applicable to a binder system that uses an acrylic acid ester oligomer and a monomer as a binder and is cured by radiation irradiation.
非磁性支持体の材質としては、ポリエチレンテレフタレ
ート、ポリエチレンλ、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レートなどのセルロース
誘導体、ポリカーボネート、ポリイミド、ポリアミドイ
ミド等の樹脂を用いることができ、必要に応じアルミニ
ウム等の金属でメタライズしてあってもよい。As the material of the non-magnetic support, polyesters such as polyethylene terephthalate, polyethylene λ, and 6-naphthalate; polyolefins such as polyethylene and polypropylene; cellulose derivatives such as cellulose triacerate; resins such as polycarbonate, polyimide, and polyamideimide are used. If necessary, it may be metallized with a metal such as aluminum.
支持体の浮みは3〜iooμ、磁気テープとしては好ま
しくは3〜−θμ、磁気ディスクとしては、20〜10
0μが通常使用される範囲である。The float of the support is 3 to iooμ, preferably 3 to −θμ for magnetic tape, and 20 to 10μ for magnetic disk.
0μ is the commonly used range.
本発明の磁気記録媒体の磁性層中の全結合剤の含有量は
、通常は強磁性粉末1oozit部に対して10〜10
0重量部であり、好ましくは、20〜参〇重量部である
。The total binder content in the magnetic layer of the magnetic recording medium of the present invention is usually 10 to 10 parts per 1 oz of ferromagnetic powder.
0 parts by weight, preferably 20 to 0 parts by weight.
本発明の磁気記録媒体の磁性層には、さらに研磨剤とし
て、モース硬度!以上の無機質粒子を含有させることが
好ましい。The magnetic layer of the magnetic recording medium of the present invention further contains an abrasive having a Mohs' hardness! It is preferable to contain the above inorganic particles.
前記無機質粒子は、モース硬度が3以上であれば特に制
限はない。モース硬度が3以上の無機質粒子の例として
は、At 203(モース硬度?)、Tie(同6)、
T io 2 (同6.j)、SiO□(同7)、8
n C) 2 (同6.3)、Cr203(同り)、お
よびα−Fe203(同1.j)を挙げることができ、
これらを単独あるいは混合して用いることができる。The inorganic particles are not particularly limited as long as they have a Mohs hardness of 3 or more. Examples of inorganic particles with a Mohs hardness of 3 or more include At 203 (Mohs hardness?), Tie (6),
T io 2 (same 6.j), SiO□ (same 7), 8
n C) 2 (same as 6.3), Cr203 (same as above), and α-Fe203 (same as above 1.j),
These can be used alone or in combination.
とくに好ましいのはモース硬度がr以上の無機質粒子で
ある。モース硬度がjよりも低い無機質粒子を用いた場
合には、磁性層から無機質粒子が脱落しやすく、またヘ
ッドの研磨作用も殆どないため、ヘッド目詰まりを発生
しやすく、また走行耐久性も乏しくなる。Particularly preferred are inorganic particles having a Mohs hardness of r or more. When inorganic particles with a Mohs hardness lower than j are used, the inorganic particles tend to fall off from the magnetic layer and have almost no abrasive action on the head, resulting in head clogging and poor running durability. Become.
無機質粒子の含有量は、通常、強磁性粉末10O重量部
に対して0,1〜20重量部の範囲であり、好IL<V
i/〜10重量部の範囲である。The content of inorganic particles is usually in the range of 0.1 to 20 parts by weight per 100 parts by weight of ferromagnetic powder, and preferably IL<V
i/~10 parts by weight.
また磁性層には上記の無機質粒子以外にも、カーボンブ
ラック(%に、平均粒径が10〜JOO口m(ナノメー
トルH10’m)のもの)などを含有させることが望ま
しい。In addition to the above-mentioned inorganic particles, the magnetic layer preferably contains carbon black (% of which has an average particle diameter of 10 to 10'm (nanometers) H10'm).
つぎに本発明の磁気記録媒体を製造する方法の例を述べ
る。Next, an example of a method for manufacturing the magnetic recording medium of the present invention will be described.
まず、強磁性粉末と結合剤、前記のメルカプト基を有す
るエステル化合物、そして必要に応じて、他の充填材、
添加剤などを溶剤と混練し、磁性塗料を調製する。混線
の際に使用する溶剤としては、磁性塗料の調製に通常使
用されている溶剤を使用することができる。First, a ferromagnetic powder, a binder, the above-mentioned ester compound having a mercapto group, and if necessary, other fillers,
Additives are mixed with a solvent to prepare magnetic paint. As the solvent used in the crosstalk, a solvent commonly used for preparing magnetic paints can be used.
混練の方法にも特に制限はなく、また各成分の添加順序
などは適宜設定することができる。There is no particular restriction on the kneading method, and the order of addition of each component can be set as appropriate.
磁性塗料を調製する際には、分散剤、帯電防止剤、潤滑
剤等の公知の添加剤を併せて使用することもできる。When preparing a magnetic paint, known additives such as dispersants, antistatic agents, lubricants, etc. can also be used.
分散剤の例としては、炭素数7−〜−一の脂肪酸、その
塩またはエステル化物およびその化合物の水素の一部あ
るいは全部をフッ素原子で置換した化合物、上記の脂肪
酸のアミド、脂肪族アミン、高級アルコール、ポリアル
キレンオキサイドアルキル燐酸エステル、アル中ル燐酸
エステル、アルキルホウ酸エステル、サルコシネート類
、アルキルエーテルエステル類、トリアルキルポリオレ
フィン、オキシ第弘級アンモニウム塩およびレシチンな
どの公知の分散剤を挙げることができる。Examples of dispersants include fatty acids having 7 to 1 carbon atoms, salts or esters thereof, compounds in which part or all of the hydrogen atoms of these compounds are replaced with fluorine atoms, amides of the above fatty acids, aliphatic amines, Mention may be made of known dispersants such as higher alcohols, polyalkylene oxide alkyl phosphates, alkyl phosphates, alkyl borates, sarcosinates, alkyl ether esters, trialkyl polyolefins, oxypronic ammonium salts, and lecithin. .
分散剤を使用する場合は、通常は使用する強磁性粉末1
00重量部に対し、0.1〜70重量部の範囲で使用さ
れる。When using a dispersant, the ferromagnetic powder 1 usually used is
0.00 parts by weight, it is used in a range of 0.1 to 70 parts by weight.
帯電防止剤の例としては、カーボンブラック、カーlシ
ブラックグラフトポリマーなどの導電性微粉末;サボニ
/などの天然界面活性剤;アルキレンオキサイド系、グ
リセリン系およびグリシドール系などのノニオ/系竹面
活性剤;高級アルキルアミン類、第参級アンモニウム塩
類、ピリジンその他の複素環化合物の塩類、ホスホニウ
ムまたはスルホニタム類などのカチオン性界面活性剤;
カルボン酸、燐酸、硫酸エステル基、燐酸エステル基等
の酸性基を含むアニオン性界面活性剤;アミノ酸類、ア
ミノスルホンサン類、アミノアルコールの硫酸筐たは燐
酸エステル類等の両性界面活性剤等を挙げることができ
る。帯電防止剤として上記の導電性微粉末°を使用する
場合には、例えば強磁性粉末100重量部に対しo、i
〜IO重量部の範囲で使用され、界面活性剤を使用する
場合にも同様に0./−〜/Q重量部の範囲で使用され
る。Examples of antistatic agents include conductive fine powders such as carbon black and curly black graft polymers; natural surfactants such as sabonic acid; nonio/bamboo surfactants such as alkylene oxides, glycerin and glycidol. Cationic surfactants such as higher alkylamines, primary ammonium salts, salts of pyridine and other heterocyclic compounds, phosphoniums or sulfonitams;
Anionic surfactants containing acidic groups such as carboxylic acid, phosphoric acid, sulfuric acid ester groups, and phosphoric ester groups; Ampholytic surfactants such as amino acids, aminosulfonsanes, and sulfuric acid or phosphoric esters of amino alcohols. can be mentioned. When using the above-mentioned conductive fine powder ° as an antistatic agent, for example, o, i
- IO parts by weight, and when a surfactant is used, the range is 0. It is used in a range of /- to /Q parts by weight.
なお、上述した分散剤、帯電防止剤、潤滑剤などの添加
剤は、厳密に上述した作用効果のみを有す、心ものであ
るとの限定の下に記載したものではなく、例えは、分散
剤が潤滑剤あるいは帯電防止剤として作用することも有
りうる。従って、−F配分類により例示した化合物など
の効果作用が、」二記分類に記載された事項に限定され
ないことは勿論であり、ま次複数の作用効果を奏する物
質を使用する場合には、添加tは、その作用効果を考慮
して決定することが好ましい。The additives mentioned above, such as dispersants, antistatic agents, and lubricants, are not strictly limited to having the above-mentioned functions and effects, and are not described under the limitation that they are additives. It is also possible that the agent acts as a lubricant or antistatic agent. Therefore, it goes without saying that the effects of the compounds exemplified by the -F classification are not limited to those listed in the second category, and when using substances that have multiple effects, It is preferable that the addition t is determined in consideration of its effects.
このようにして調製された磁性塗料は前述の非磁性支持
体上に塗布される。塗布は、前記非磁性支持体上に直接
性なうことも可能であるが、また、接着剤層などの中間
層を介して非磁性支持体上に塗布することもできる。こ
こでいう中間層とは接着剤単独の層または結合剤中にカ
ーボン等の非磁性微粒子を分散してなる複合膜層等であ
る。The magnetic paint thus prepared is applied onto the non-magnetic support described above. The coating can be applied directly onto the non-magnetic support, but it can also be applied onto the non-magnetic support via an intermediate layer such as an adhesive layer. The intermediate layer herein refers to a layer of adhesive alone or a composite film layer formed by dispersing non-magnetic fine particles such as carbon in a binder.
カーボンを含有する中間層は結合剤として磁性層に用い
られる種々の結合剤のなかから任意に選ぶことができる
。カーボンの粒径は1010−1OnナノメートルHi
o ’m)のものが好1しく、バインダー;カーボン
は重量比にして/Qo:ioから100’、/60が好
ましい。中間層の厚みは単なる接着剤層の場合0./〜
2μFF+、非磁性粉体を含む複合層の場合O13〜弘
μmが好−ましい。The carbon-containing intermediate layer can be arbitrarily selected as a binder from among various binders used in magnetic layers. The particle size of carbon is 1010-1 On nanometer Hi
o'm) is preferable, and the weight ratio of binder: carbon is preferably /Qo:io to 100', /60. The thickness of the intermediate layer is 0.0 if it is just an adhesive layer. /~
2μFF+, and in the case of a composite layer containing non-magnetic powder, O13 to Hiroμm is preferred.
中間層にはこのほか磁性層に用いている潤滑剤と同じま
たは異なる潤滑剤を添加してもよい。In addition, a lubricant that is the same as or different from the lubricant used in the magnetic layer may be added to the intermediate layer.
上記の強磁性粉末と結合剤の分散方法および支持体への
撒布方法などの詳細は%開昭!弘−4tぶ0//号およ
び同!4!−Jiroj号等の各公報に記載されている
。For details on how to disperse the above ferromagnetic powder and binder and how to spread it on the support, please refer to %Kaisho! Hiro-4tbu0// issue and the same! 4! - Described in various publications such as Jiroj issue.
このようにして塗布される磁性層の厚さは、乾燥後の厚
さで一般には約0.!〜70μmの範囲、通常は0.7
〜4.(7μmの範囲になるよう塗布される。The thickness of the magnetic layer coated in this way is generally about 0.05 mm after drying. ! ~70μm range, typically 0.7
~4. (It is applied to a thickness of 7 μm.
非磁性支持体上に塗布された磁性層は磁気記録媒体がテ
ープ状で使用される場合通常、磁性層中の強磁性粉末を
配向させる処理、即ち磁場配向処理を施したあと、乾燥
される。また逆にディスク状媒体の場合は磁気特性の異
方性をとりのぞくために、磁場による無配向処理が施さ
れる。こののち必要によ!7表面平滑化処理が施される
。When a magnetic recording medium is used in the form of a tape, the magnetic layer coated on the non-magnetic support is usually subjected to a treatment for orienting the ferromagnetic powder in the magnetic layer, that is, a magnetic field orientation treatment, and then dried. On the other hand, in the case of a disk-shaped medium, non-orientation treatment is performed using a magnetic field in order to eliminate anisotropy in magnetic properties. I'll need it later! 7. Surface smoothing treatment is performed.
以下に示す実施例をもって本発明の新規な吾徴を具体的
に説明する。なお、その中で「部Jとあるのは「重量部
」を表す。The novel features of the present invention will be specifically explained with reference to the following examples. In addition, "part J" represents "part by weight."
〔実施例−1〕
CO添加1’eQx粉末(x=
/、v1平均粒子径17.J
amxO,03μm) lOo部塩化ビニル
・酢酸ビニル・無
水マレイン酸共重合体
(ダooX110A、 日本
ゼオン■社製) 73部ポリウレ
タン(N=、230Q、
日本ポリウレタン■社製) り部Cr 20
37部
カーゼンブラック(旭#to。[Example-1] CO-added 1'eQx powder (x = /, v1 average particle diameter 17.J amxO, 03 μm) 100 parts Vinyl chloride/vinyl acetate/maleic anhydride copolymer (DaooX110A, Nippon Zeon Corporation) (manufactured by Nippon Polyurethane) 73 parts polyurethane (N=, 230Q, manufactured by Nippon Polyurethane) Part Cr 20
Part 37 Carzen Black (Asahi #to.
旭カーiン■社製) j部エステル化
合物 第1%に記載メチルエチルケトン
7一部トルエン
7一部メチルインブチルケトン
3ご部上記組成物をボールミルに投入しほぼ70時
間混線分散処理を行い、強磁性粉末を均一に分散した。(Manufactured by Asahi Carin ■) Part J Ester compound Listed in 1% Methyl ethyl ketone 7 Part Toluene
7 Partial methyl in butyl ketone
Three parts of the above composition were placed in a ball mill and cross-dispersed for approximately 70 hours to uniformly disperse the ferromagnetic powder.
しかる後にポリイソシアネート(コロネート30弘/、
日本ポリウレタン物社製)を7部加えてさらに7時間混
練して、磁性塗料を得た。次にこの磁性塗料を厚さ7部
μm5 巾zoommでかつ表面粗さがRa値で0.0
21μm(カットオフ値O1−!μm)のポリエチレン
テレフタレートの非磁性基体上に塗布して磁性層を形成
し磁気記録媒体を得た。乾燥、カレンダーによる表面平
滑化処理後の磁性層の厚さは一0jμmであった。After that, polyisocyanate (Coronate 30 Hiro/,
7 parts of Nippon Polyurethane Co., Ltd.) were added and kneaded for a further 7 hours to obtain a magnetic paint. Next, apply this magnetic paint to a thickness of 7 parts μm, 5 mm wide, and a surface roughness of 0.0 in terms of Ra value.
A magnetic recording medium was obtained by coating a magnetic layer on a nonmagnetic substrate of polyethylene terephthalate having a diameter of 21 μm (cutoff value O1−!μm). The thickness of the magnetic layer after drying and surface smoothing treatment by calender was 10 μm.
かくして得られた磁気記録媒体を直径7.7インチのフ
ロッピーディスクに加工し測定試料とした。The magnetic recording medium thus obtained was processed into a 7.7-inch diameter floppy disk and used as a measurement sample.
第1表
なお、上の第1表中、「イソ」とはメチル分岐のことで
あり、また試料A≦のステアリン酸インステアリルは、
分岐位置が正規分布している。Table 1 In Table 1 above, "iso" refers to methyl branch, and instearyl stearate of sample A≦ is:
Branch positions are normally distributed.
以上のようにして得られた各試料について高温度高湿度
(70’C,10%几H)下及び低温度下(! oC,
jO%RH)での走行耐久性、下に示す温湿度サイクル
での走行耐久性を、3.1インチのフロッピーディスク
ドライブ(ソニー■社MOA−D3−W)を用い、各試
料を30019mで連続走行させ、その出力が初期値の
tOSに低下するまでのパス回数で表した。Each sample obtained as described above was tested at high temperature and high humidity (70'C, 10% H) and at low temperature (!oC,
Using a 3.1-inch floppy disk drive (Sony Corporation MOA-D3-W), each sample was continuously tested for 30,019 m. The vehicle was run and expressed as the number of passes until the output decreased to the initial value tOS.
(m湿度サイクル)
メチル分岐を有しかつ分子の大きさがある範囲にあるエ
ステル化合物を添加した本発明の磁気記録媒体は、添加
量が適切でさえあれば、試料番号4乃至グ及び6乃至/
弘の測定結果から明らかなように、広範囲の環境条件で
優れた走行耐久性を示すことが分かった。(m humidity cycle) The magnetic recording medium of the present invention to which an ester compound having a methyl branch and having a molecular size within a certain range can be used as long as the amount added is appropriate. /
As is clear from Hiroshi's measurement results, it was found to exhibit excellent running durability under a wide range of environmental conditions.
それに対し、本発明で用するエステル化合物とは分子構
造が異なるエステル化合物を使用し九試料/j乃至/7
では、すべての環境条件下で充分な走行耐久性を示さな
かつ次。In contrast, nine samples /j to /7 were prepared using ester compounds with different molecular structures from the ester compounds used in the present invention.
However, it does not exhibit sufficient running durability under all environmental conditions.
また、メチル分岐を有しかつ分子の大きさがある範囲に
ある本発明で用いるエステル化合物であっても、磁性層
中でのその保持量が多すぎたり逆に少なすぎる試料番号
/及び!ではいずれの環境条件においても充分な走行耐
久性を示さなかった。Moreover, even if the ester compound used in the present invention has a methyl branch and has a molecular size within a certain range, the amount retained in the magnetic layer may be too large or too small. It did not show sufficient running durability under any environmental conditions.
〔実施例−2〕
73μmの厚さのポリエチレンテレフタレートフィルム
上に膜厚/!Onmのコバルト−ニッケルの強磁性金属
薄膜を斜め蒸着して、金属薄膜型磁気記録媒体を得た。[Example-2] Film thickness /! on a polyethylene terephthalate film with a thickness of 73 μm. A thin metal film type magnetic recording medium was obtained by obliquely depositing a ferromagnetic metal thin film of Onm cobalt-nickel.
その際の蒸発源は電子ビーム35発源を使用した。これ
にコバルト−ニッケル合金(cOrOffi子s、Ni
−0i子第)を仕込真空槽内の真空度がJxIOTor
r中において酸素気流中で入射角がto”となるように
斜め蒸着した。得られた金属薄膜型磁気記録媒体の試料
の磁性層表面に第3表に示す各種のエステル化合物をメ
チルエチルケトンに溶解した溶液を塗布、乾燥して、磁
性層の表面にエステル化合物が保持され次試料扁/rか
ら一コを得た。An electron beam 35 source was used as the evaporation source at that time. Cobalt-nickel alloy (cobalt-nickel alloy)
-0i child) is prepared and the degree of vacuum in the vacuum chamber is JxIO Tor.
The various ester compounds shown in Table 3 were dissolved in methyl ethyl ketone on the surface of the magnetic layer of the sample of the obtained metal thin film magnetic recording medium. The solution was applied and dried, and the ester compound was retained on the surface of the magnetic layer, and a sample was obtained from the next sample.
得られた、試料をVTR(富士写真フィルム株式会社!
RFUJIX−r、スチル時間を制限する機能を取り去
った。)により、7MHzの信号を記録し、スチル再生
した。そして同一のVTRを用いてステル耐久性を評価
し次。測定環境条件は、JJ ’C,AoiRHとり、
た。The obtained sample was transferred to a VTR (Fuji Photo Film Co., Ltd.).
RFUJIX-r, the function to limit still time has been removed. ), a 7 MHz signal was recorded and still reproduced. Next, we evaluated stealth durability using the same VTR. The measurement environment conditions were JJ'C, AoiRH,
Ta.
第3表(表中イソとはメチル分岐のことをいう。Table 3 (iso in the table refers to methyl branch.
1゜ 事件の表示 昭和63 年特願第203331号 2、発明の名称 磁気記鍮媒体 3、補正をする者 事件との関係1゜ Display of incidents Showa 63 Patent Application No. 203331 2. Name of the invention magnetic brass medium 3. Person who makes corrections Relationship with the incident
Claims (5)
おいて、下記一般式( I )で表されるエステル化合物
の少なくとも1種を該磁性層中又は該磁性層の表面上に
保持したことを特徴とする磁気記録媒体。 ▲数式、化学式、表等があります▼( I ) ただし、R_1は、炭素数7乃至29の直鎖又は分岐の
アルキル基又はアルケニル基 n、mは、整数であつて、nは2以上、nとmの和は7
乃至33である。(1) In a magnetic recording medium having a magnetic layer on a non-magnetic support, at least one ester compound represented by the following general formula (I) is retained in the magnetic layer or on the surface of the magnetic layer. A magnetic recording medium characterized by: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (I) However, R_1 is a linear or branched alkyl group or alkenyl group having 7 to 29 carbon atoms, n and m are integers, and n is 2 or more, n The sum of and m is 7
〜33.
る磁性層であつて且つ一般式( I )で表されるエステ
ル化合物が該強磁性粉末に対して1乃至25重量%該磁
性層中に保持されていることを特徴とする特許請求の範
囲第1項記載の磁気記録媒体。(2) The magnetic layer is a magnetic layer mainly composed of a ferromagnetic metal powder and a binder resin, and the ester compound represented by the general formula (I) is contained in an amount of 1 to 25% by weight based on the ferromagnetic powder. 2. A magnetic recording medium according to claim 1, wherein the magnetic recording medium is held in a layer.
)で表されるエステル化合物の該磁性層表面での保持量
が2乃至5mg/m^2であることを特徴とする特許請
求の範囲第1項記載の磁気記録媒体。(3) The magnetic layer is a ferromagnetic metal thin film and has the general formula (I
2. The magnetic recording medium according to claim 1, wherein the amount of the ester compound represented by ) retained on the surface of the magnetic layer is 2 to 5 mg/m^2.
至22であるエステル化合物であることを特徴とする特
許請求の範囲第1項記載の磁気記録媒体。(4) The magnetic recording medium according to claim 1, wherein in the general formula (I), R_1 is an ester compound having 14 to 22 carbon atoms.
であるエステル化合物であることを特徴とする特許請求
の範囲第4項記載の磁気記録媒体。(5) In general formula (I), the sum of n and m is 9 to 19
5. The magnetic recording medium according to claim 4, which is an ester compound.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20333588A JPH0253220A (en) | 1988-08-16 | 1988-08-16 | Magnetic recording medium |
DE3924449A DE3924449A1 (en) | 1988-07-25 | 1989-07-24 | Magnetic recording medium - has magnetic layer contg. or coated with long chain ester cpd with branched chain |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20333588A JPH0253220A (en) | 1988-08-16 | 1988-08-16 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0253220A true JPH0253220A (en) | 1990-02-22 |
Family
ID=16472311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20333588A Pending JPH0253220A (en) | 1988-07-25 | 1988-08-16 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0253220A (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54140504A (en) * | 1978-04-24 | 1979-10-31 | Victor Co Of Japan Ltd | Magnetic recording lubricant |
JPS6124540A (en) * | 1984-07-14 | 1986-02-03 | Daisan Kasei Kk | Carboxylic acid derivative of isomyristyl alcohol |
JPS62231425A (en) * | 1986-03-31 | 1987-10-12 | Tdk Corp | Magnetic recording medium |
JPS63168834A (en) * | 1987-01-06 | 1988-07-12 | Tokin Corp | Production of magnetic recording medium |
-
1988
- 1988-08-16 JP JP20333588A patent/JPH0253220A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54140504A (en) * | 1978-04-24 | 1979-10-31 | Victor Co Of Japan Ltd | Magnetic recording lubricant |
JPS6124540A (en) * | 1984-07-14 | 1986-02-03 | Daisan Kasei Kk | Carboxylic acid derivative of isomyristyl alcohol |
JPS62231425A (en) * | 1986-03-31 | 1987-10-12 | Tdk Corp | Magnetic recording medium |
JPS63168834A (en) * | 1987-01-06 | 1988-07-12 | Tokin Corp | Production of magnetic recording medium |
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