JPH0522966B2 - - Google Patents
Info
- Publication number
- JPH0522966B2 JPH0522966B2 JP59134944A JP13494484A JPH0522966B2 JP H0522966 B2 JPH0522966 B2 JP H0522966B2 JP 59134944 A JP59134944 A JP 59134944A JP 13494484 A JP13494484 A JP 13494484A JP H0522966 B2 JPH0522966 B2 JP H0522966B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- ferromagnetic metal
- thin film
- magnetic recording
- metal thin
- 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.)
- Expired - Lifetime
Links
- 230000005291 magnetic effect Effects 0.000 claims description 54
- 239000002184 metal Substances 0.000 claims description 31
- 229910052751 metal Inorganic materials 0.000 claims description 31
- 230000005294 ferromagnetic effect Effects 0.000 claims description 28
- 239000010409 thin film Substances 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- 239000011230 binding agent Substances 0.000 claims description 13
- 239000010419 fine particle Substances 0.000 claims description 11
- 229920000642 polymer Polymers 0.000 claims description 11
- 230000009477 glass transition Effects 0.000 claims description 8
- 229920001225 polyester resin Polymers 0.000 claims description 5
- 239000004645 polyester resin Substances 0.000 claims description 5
- 229920005749 polyurethane resin Polymers 0.000 claims description 5
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 claims description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- 229920000459 Nitrile rubber Polymers 0.000 claims description 2
- 239000010408 film Substances 0.000 description 18
- -1 polyethylene terephthalate Polymers 0.000 description 18
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 235000014113 dietary fatty acids Nutrition 0.000 description 8
- 239000000194 fatty acid Substances 0.000 description 8
- 229930195729 fatty acid Natural products 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 150000004665 fatty acids Chemical class 0.000 description 6
- 238000004544 sputter deposition Methods 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 5
- 238000007733 ion plating Methods 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 4
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000001771 vacuum deposition Methods 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 3
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 2
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 2
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 2
- 235000021357 Behenic acid Nutrition 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000005639 Lauric acid Substances 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- 235000021314 Palmitic acid Nutrition 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- DTOSIQBPPRVQHS-PDBXOOCHSA-N alpha-linolenic acid Chemical compound CC\C=C/C\C=C/C\C=C/CCCCCCCC(O)=O DTOSIQBPPRVQHS-PDBXOOCHSA-N 0.000 description 2
- 235000020661 alpha-linolenic acid Nutrition 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 229940116226 behenic acid Drugs 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- HOWGUJZVBDQJKV-UHFFFAOYSA-N docosane Chemical compound CCCCCCCCCCCCCCCCCCCCCC HOWGUJZVBDQJKV-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- MVLVMROFTAUDAG-UHFFFAOYSA-N ethyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC MVLVMROFTAUDAG-UHFFFAOYSA-N 0.000 description 2
- MSYLJRIXVZCQHW-UHFFFAOYSA-N formaldehyde;6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound O=C.NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 MSYLJRIXVZCQHW-UHFFFAOYSA-N 0.000 description 2
- BXWNKGSJHAJOGX-UHFFFAOYSA-N hexadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCO BXWNKGSJHAJOGX-UHFFFAOYSA-N 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229960004488 linolenic acid Drugs 0.000 description 2
- KQQKGWQCNNTQJW-UHFFFAOYSA-N linolenic acid Natural products CC=CCCC=CCC=CCCCCCCCC(O)=O KQQKGWQCNNTQJW-UHFFFAOYSA-N 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 2
- LQERIDTXQFOHKA-UHFFFAOYSA-N nonadecane Chemical compound CCCCCCCCCCCCCCCCCCC LQERIDTXQFOHKA-UHFFFAOYSA-N 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 2
- 235000021313 oleic acid Nutrition 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- IIYFAKIEWZDVMP-UHFFFAOYSA-N tridecane Chemical compound CCCCCCCCCCCCC IIYFAKIEWZDVMP-UHFFFAOYSA-N 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-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
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- JSZOAYXJRCEYSX-UHFFFAOYSA-N 1-nitropropane Chemical compound CCC[N+]([O-])=O JSZOAYXJRCEYSX-UHFFFAOYSA-N 0.000 description 1
- RZRNAYUHWVFMIP-KTKRTIGZSA-N 1-oleoylglycerol Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC(O)CO RZRNAYUHWVFMIP-KTKRTIGZSA-N 0.000 description 1
- LOUICXNAWQPGSU-UHFFFAOYSA-N 2,2,3,3-tetrafluorooxirane Chemical compound FC1(F)OC1(F)F LOUICXNAWQPGSU-UHFFFAOYSA-N 0.000 description 1
- SZIFAVKTNFCBPC-UHFFFAOYSA-N 2-chloroethanol Chemical compound OCCCl SZIFAVKTNFCBPC-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- 229910000521 B alloy Inorganic materials 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 229910020674 Co—B Inorganic materials 0.000 description 1
- ORAWFNKFUWGRJG-UHFFFAOYSA-N Docosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCC(N)=O ORAWFNKFUWGRJG-UHFFFAOYSA-N 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 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
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- LZBCVRCTAYKYHR-UHFFFAOYSA-N acetic acid;chloroethene Chemical compound ClC=C.CC(O)=O LZBCVRCTAYKYHR-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 125000002511 behenyl 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])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- VBICKXHEKHSIBG-UHFFFAOYSA-N beta-monoglyceryl stearate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 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
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 229960000541 cetyl alcohol Drugs 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- TUTWLYPCGCUWQI-UHFFFAOYSA-N decanamide Chemical compound CCCCCCCCCC(N)=O TUTWLYPCGCUWQI-UHFFFAOYSA-N 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 229940117389 dichlorobenzene Drugs 0.000 description 1
- ILRSCQWREDREME-UHFFFAOYSA-N dodecanamide Chemical compound CCCCCCCCCCCC(N)=O ILRSCQWREDREME-UHFFFAOYSA-N 0.000 description 1
- 125000003438 dodecyl group Chemical group [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])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- ZJOLCKGSXLIVAA-UHFFFAOYSA-N ethene;octadecanamide Chemical compound C=C.CCCCCCCCCCCCCCCCCC(N)=O.CCCCCCCCCCCCCCCCCC(N)=O ZJOLCKGSXLIVAA-UHFFFAOYSA-N 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- FEEPBTVZSYQUDP-UHFFFAOYSA-N heptatriacontanediamide Chemical compound NC(=O)CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC(N)=O FEEPBTVZSYQUDP-UHFFFAOYSA-N 0.000 description 1
- HSEMFIZWXHQJAE-UHFFFAOYSA-N hexadecanamide Chemical compound CCCCCCCCCCCCCCCC(N)=O HSEMFIZWXHQJAE-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- SFIHQZFZMWZOJV-HZJYTTRNSA-N linoleamide Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(N)=O SFIHQZFZMWZOJV-HZJYTTRNSA-N 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- RZRNAYUHWVFMIP-UHFFFAOYSA-N monoelaidin Natural products CCCCCCCCC=CCCCCCCCC(=O)OCC(O)CO RZRNAYUHWVFMIP-UHFFFAOYSA-N 0.000 description 1
- 125000001421 myristyl 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])[H] 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- 125000001117 oleyl 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])=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])[H] 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
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- 239000012188 paraffin wax Substances 0.000 description 1
- MOQRZWSWPNIGMP-UHFFFAOYSA-N pentyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCC MOQRZWSWPNIGMP-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 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 1
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- 229910052718 tin Inorganic materials 0.000 description 1
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Description
〔産業上の利用分野〕
本発明は蒸着、イオンプレーテイング、スパツ
タリング等によつて非磁性支持体上に強磁性金属
薄膜を形成してなるいわゆる強磁性金属薄膜型の
磁気記録媒体に関するものである。
〔背景技術とその問題点〕
従来より磁気記録媒体としては、非磁性支持体
上にr−Fe2O3,Coを含有するr−Fe2O3,
Fe3O4,Coを含有するFe3O4,r−Fe2O3と
Fe3O4のベルトライド化合物、Coを含有するベル
トライド化合物、CrO2等の酸化物磁性粉末ある
いはFe,Co,Ni等を主成分とする合金磁性粉末
等の粉末磁性材料を塩化ビニル−酢酸ビニル共重
合体、ポリエステル樹脂、ポリウレタン樹脂等の
有機バインダー中に分散せしめ、塗布、乾燥させ
る塗布型の磁気記録媒体が広く使用されてきてい
る。
近年高密度磁気記録への要求の高まりと共に、
非磁性支持体上に強磁性金属からなる金属薄膜を
真空蒸着法、スパツタリング法、イオンプレーテ
イング法、メツキ法の手法を用いて直接被着形成
した強磁性薄膜型磁気記録媒体が注目を集めてい
る。この強磁性金属薄膜型磁気記録媒体は抗磁力
Hcや残留磁束密度Brが大きいばかりでなく、磁
性層の厚みを極めて薄くすることが可能であるた
め、記録減磁や再生時の厚み損失が著しく小さい
こと、磁性層中に非磁性材である有機バインダー
を混入する必要がないため磁性材料の充填密度を
高めることができること等、磁気特性の点で数々
の利点を有している。
ところでこの種の磁気記録媒体にあつては、上
記強磁性金属薄膜を形成する手段として真空蒸着
法等を用いるため非磁性支持体であるベースフイ
ルムに熱的損傷を受け易く、またこのベースフイ
ルム上に蒸発金属原子が再結晶して薄膜となる際
に収縮して内部応力が発生し、強磁性金属薄膜が
内側となるように凹状にカールしてしまうという
欠点を有している。このようなカールが生ずる
と、この磁気記録媒体と磁気ヘツドの当りが悪く
なつて、再生出力が低下してしまつたり巻き乱れ
が生じたりする。
そこで従来、上述のようなカールを解消するた
めに種々の方法が提案されている。
例えば磁性薄膜被着後、応力を加え磁性薄膜に
1種のヒビ割れを生じさせ歪応力を緩和させるこ
とが特開昭53−83706号、特開昭53−104204号公
報等に開示されている。また磁性薄膜被着後、基
板に熱処理を行つて基板側を収縮させることによ
り応力緩和させることが特開昭57−16032号公報
等に開示されている。また磁気記録媒体の裏面
側、すなわち磁性層と反対側にバツクコート層を
設けることにより応力緩和させることが特開昭56
−11622号、特開昭56−16939号公報等に開示され
ている。
しかしながらこれらの方法はいずれも成膜の際
のカールを防止できるものではなく、生産性その
他の点で欠点が多い。
尚蒸着以外のその他の被着法、スパツタリン
グ、イオンプレーテイング等によるときにも、成
膜の際のカールは極めて大きな問題であり、その
十分な防止策は未だ実現していない。
また上記強磁性金属薄膜型磁気記録媒体にあつ
ては、磁性層である強磁性金属を真空薄膜形成技
術により作製するため、その表面が極めて平滑性
に優れたものとなり、いわゆる鏡面状態となるこ
とが知られている。
このように磁性層の表面平滑性が良好なものと
なると、例えばスペーシングロス等の点では有利
であるが、走行性や耐久性の面で支障をきたす虞
れがある。すなわち、上記磁性層の表面が平滑に
なり過ぎると、例えば磁気ヘツドやガイドポス
ト、回転ヘツド用シリンダー等との接触部におい
て、凝着現象(いわゆるはりつき)が起こりやす
くなり、また実質的な接触面積が大きいことから
摩擦係数が大きなものとなる等、走行性が極めて
悪化し、これに伴なつて耐久性も低下してしま
う。
〔発明の目的〕
本発明は、上述の従来の実情に鑑みて提案され
たものであつて、カールがなく、磁気ヘツドや回
転ヘツド用シリンダー等との接触部分において安
定な走行性が得られ、容易に表面粗度のコントロ
ールを図ることが可能な磁気記録媒体を提供する
ことを目的とするものである。
〔問題点を解決するための手段〕
すなわち本発明は、非磁性支持体上にガラス転
移点が30℃以下であるポリウレタン樹脂、ポリエ
ステル樹脂、塩化ビニリデン樹脂、スチレン−ブ
タジエンゴム、アクリロニトリル−ブタジエンゴ
ムより選ばれた少なくとも1種よりなる樹脂結合
剤と粒径250Å〜2000Åの高分子微粒子よりなる
下塗層を形成し、該下塗層上に強磁性金属薄膜を
形成したことを特徴とする磁気記録媒体に関する
ものである。
本発明による磁気記録媒体を第1図に示す。図
において1は非磁性支持体、2は強磁性金属薄
膜、3はガラス転移点30℃以下の樹脂結合剤、4
は粒径250Å〜2000Åの高分子微粒子である。本
発明による磁気記録媒体の下塗層はガラス転移点
(以下、Tgという。)30℃以下の樹脂結合剤3と
粒径250Å〜2000Åの高分子微粒子4によつて構
成され、Tg30℃以下の樹脂結合剤3は連続皮膜
を形成し、また粒径250Å〜2000Åの高分子微粒
子4は粒状突起を形成する。上記樹脂結合剤3か
らなる連続皮膜は磁性層である強磁性金属薄膜2
及び非磁性支持体1よりも柔らかく、強磁性金属
薄膜2と非磁性支持体1との間に生ずる応力集中
を分散し、応力緩和させるためカールの発生を抑
制することができる。また上記粒状突起により強
磁性金属薄膜2表面の面粗度を制御することがで
き、磁気記録媒体の走行性を改善することができ
る。更に上記下塗層により磁気記録媒体の耐久性
を改善することができる。
Tg30℃以下の樹脂結合剤3によつて構成され
る連続皮膜の膜厚が厚くなる程、カールの量は少
なくなるが、連続皮膜の膜厚が厚くなると表面平
滑性が悪くなり、磁気記録媒体の電磁変換特性が
悪くなる。よつて上記連続皮膜の膜厚は1μm以
下であるのが望ましい。
また粒径250Å〜2000Åの高分子微粒子4によ
つて構成される粒状突起においては、その粒子密
度が重要であつて、上記粒状突起が下塗層表面に
10万〜2000万個/mm2程度形成されていることが望
ましい。上記粒状突起の密度が10万個/mm2未満で
あると耐久性の向上は望めず、また2000万個/mm2
を越えると画質が低下する。更に高分子の粒径は
250Å〜2000Åであるのが好ましい。粒径が250Å
未満であると耐久性の向上は望めず、また2000Å
を越えると画質が低下する。
本発明による下塗層はTg30℃以下の樹脂結合
剤及び粒径250Å〜2000Åの高分子微粒子を溶媒
に分散させた下塗塗料を非磁性支持体1上に塗布
することにより形成される。
Tgが30℃以下の樹脂結合剤3としては、例え
ばポリウレタン樹脂、ポリエステル樹脂、塩化ビ
ニリデン樹脂、スチレン−ブタジエンゴム、アク
リロニトリル−ブタジエン等が挙げられる。
粒径250Å〜2000Åの高分子微粒子4としては、
例えばスチレン・ジビニルベンゼン共重合体、ベ
ンゾグアナミン−ホルムアルデヒド縮合物、ポリ
塩化ビニル等が挙げられる。
溶剤としては、例えばアセトン、メチルエチル
ケトン、メチルイソブチルケトン、シクロヘキサ
ノン等のケトン類、メタノール、エタノール、プ
ロパノール、ブタノール等のアルコール類、酢酸
メチル、酢酸エチル、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類、エチレン
グリコールジメチルエーテル、エチレングリコー
ルモノエチルエーテル、テトラヒドロフラン、ジ
オキサン等のエーテル類、ベンゼン、トルエン、
キシレン等の芳香族炭化水素、ヘキサン、ヘプタ
ン等の脂肪族炭化水素、メチレンクロライド、エ
チレンクロライド、四塩化炭素、クロロホルム、
エチレンクロルヒドリン、ジクロルベンゼン等の
塩素化炭化水素、ニトロプロパン等が挙げられ
る。
非磁性支持体1の素材としては、ポリエチレン
テレフタレート等のポリエステル類、ポリエチレ
ン、ポリプロピレン等のポリオレヘイン類、セル
ローストリアセテート、セルロースダイアセテー
ト、セルロースアセテートブチレート等のセルロ
ース誘導体、ポリ塩化ビニル、ポリ塩化ビニリデ
ン等のビニル系樹脂、ポリカーボネート、ポリイ
ミド、ポリアミドイミド等のプラスチツク等が挙
げられる。また、上記非磁性支持体の形態として
は、フイルム、テープ、シート、デイスク、カー
ド、ドラム等のいずれでもよい。
強磁性金属薄膜2の材料としては、Fe,Co,
Ni等の金属あるいはCo−Ni合金、Fe−Co合金、
Fe−Ni合金、Fe−Co−Ni合金、Fe−Co−B合
金、Co−Ni−Fe−B合金あるいはこれらにCr,
Al等の金属が含有されたもの等が挙げられる。
上記強磁性金属薄膜材料の被着手段としては、
真空蒸着法、イオンプレーテイング法、スパツタ
リング法等が挙げられる。上記真空蒸着法は、
10-4〜10-8Torrの真空下で上記強磁性金属材料
を抵抗加熱、高周波加熱、電子ビーム加熱等によ
り蒸発させ非磁性支持体上に蒸発金属(強磁性金
属材料)を沈着するというものであり、斜方蒸着
法及び垂直蒸着法に大別される。上記斜方蒸着法
は、高い抗磁力を得るため非磁性支持体に対して
上記強磁性金属材料を斜め蒸着するものであつ
て、より高い抗磁力を得るために酸素雰囲気中で
上記蒸着を行なうものも含まれる。上記垂直蒸着
法は、蒸着効率や生産性を向上し、かつ高い抗磁
力を得るために非磁性支持体上にあらかじめBi,
Sb,Pb,Sn,Ga,In,Cd,Ge,Si,Tl等の下
地金属層を形成しておき、この下地金属層上に上
記強磁性金属材料を垂直に蒸着するというもので
ある。上記イオンプレーテイング法も真空蒸着法
の一種であり、10-4〜10-3Torrの不活性ガス雰
囲気中でDCグロー放電、RFグロー放電を起こ
し、放電中で上記強磁性金属を蒸発させるという
ものである。上記スパツタリング法は、10-3〜
10-1Torrのアルゴンガスを主成分とする雰囲気
中でグロー放電を起こし、生じたアルゴンイオン
でターゲツト表面の原子をたたき出すというもの
であり、グロー放電の方法により直流2極、3極
スパツター法や、高周波スパツター法、またマグ
ネトロン放電を利用したマグネトロンスパツター
法等がある。
また磁気記録媒体の走行性を改善するために、
前述した強磁性金属薄膜2表面に潤滑剤層を形成
せしめることも可能である。
潤滑剤としては、脂肪酸、脂肪酸エステル、脂
肪酸アミド、金属石ケン、脂肪族アルコール、パ
ラフイン、シリコーン、フツ素系界面活性剤等が
使用でき、潤滑剤の塗布量は1〜1000mg/m2であ
るのが好ましい。
脂肪酸としては、ラウリン酸、ミリスチン酸、
パルミチン酸、ステアリン酸、ベヘン酸、オレイ
ン酸、リノール酸、リノレン酸等の炭素数が12個
以上のものが使用できる。
脂肪酸エステルとしては、ステアリン酸エチ
ル、ステアリン酸ブチル、ステアリン酸アミル、
ステアリン酸モノグリセリド、オレイン酸モノグ
リセリド等が使用できる。
脂肪酸アミドとしては、カプロン酸アミド、カ
プリン酸アミド、ラウリン酸アミド、パルミチン
酸アミド、ステアリン酸アミド、ベヘン酸アミ
ド、オレイン酸アミド、リノール酸アミド、メチ
レンビスステアリン酸アミド、エチレンビスステ
アリン酸アミド等が使用できる。
金属石ケンとしては、ラウリン酸、ミリスチン
酸、パルミチン酸、ステアリン酸、ベヘン酸、オ
レイン酸、リノール酸、リノレン酸等のZn,Pb,
Ni,Co,Fe,Al,Mg,Sr,Cu等との塩、ラウ
リル、パルミチル、ミリスチル、ステアリル、ベ
ヘニル、オレイル、リノール、リノレン等のスル
ホン酸と上記金属との塩等が使用できる。
脂肪族アルコールとしては、セチルアルコー
ル、ステアリルアルコール等が使用できる。
パラフインとしては、n−ノナデカン、n−ト
リデカン、n−ドコサン等の飽和炭化水素が使用
できる。
シリコーンとしては、水素がアルキル基または
フエニル基で部分置換されたポリシロキサン及び
それらを脂肪酸、脂肪族アルコール、脂肪酸アミ
ド等で変性したもの等が使用できる。
フツ素系界面活性剤としては、パーフロロアル
キルカルボン酸及びパーフロロアルキルスルホン
酸とNa,K,Mg,Zn,Al,Fe,Co,Ni等との
塩、パーフロロアルキルリン酸エステル、パーフ
ロロアルキルベタイン、パーフロロアルキルトリ
メチルアンモニウム塩、パーフロロエチレンオキ
サイド、パーフロロアルキル脂肪族エステル等が
使用できる。
〔実施例〕
以下本発明の具体的な実施例について説明する
が、本発明がこの実施例に限定されるものでない
ことは言うまでもない。
実施例 1
厚さ12μmのポリエチレンテレフタレートフイ
ルム上に、粒径が300Åのスチレン−ジビニルベ
ンゼン共重合体の微粒子とガラス転移点が−43℃
のポリウレタン樹脂をメチルエチルケトン、メチ
ルイソブチルケトン、トルエンの1:1:1混合
溶媒に分散させた下塗塗料を塗布し、粒子密度が
200万個/mm2で、連続皮膜の膜厚が100Åである下
塗層を形成した。
次に上記下塗層上に真空蒸着装置を用いてコバ
ルトCoを入射角50゜〜90゜で斜方蒸着し、膜厚約
1300Åの強磁性金属薄膜を形成しサンプルテープ
を作成した。
実施例 2
厚さ12μmのポリエチレンテレフタレートフイ
ルム上に、粒径が300Åのスチレン−ジビニルベ
ンゼン共重合体の微粒子とガラス転移点が−28℃
のポリエステル樹脂をメチルエチルケトン、メチ
ルイソブチルケトン、トルエンの1:1:1混合
溶媒に分散させた下塗塗料を塗布し、粒子密度が
200万個/mm2で、連続皮膜の膜厚が100Åである下
塗層を形成した。
次いで実施例1と同様の方法によりサンプルテ
ープを作成した。
実施例 3
厚さ12μmのポリエチレンテレフタレートフイ
ルム上に、粒径が400Åのベンゾグアナミン−ホ
ルムアルデヒド縮合物の微粒子とガラス転移点が
−19℃の塩化ビニリデン樹脂をテトラヒドロフラ
ンに分散させた下塗塗料を塗布し、粒子密度が
300万個/mm2で、連続皮膜の膜厚が200Åである下
塗層を形成した。
次いで実施例1と同様の方法によりサンプルテ
ープを作成した。
比較例
厚さ12μmのポリエチレンテレフタレートフイ
ルム上に、真空蒸着装置を用いてコバルトCoを
入射角50゜〜90゜で斜方蒸着し、膜厚約1300Åの強
磁性金属薄膜を形成しサンプルテープを作成し
た。
上述の各実施例及び比較例で得られたサンプル
テープについて、カール量、スチル特性及び画質
を測定したところ、次表に示すような結果が得ら
れた。尚カール量は1/2インチ幅の磁気記録媒体
における第2図中hで示す量を測定し、スチル特
性はサンプルテープに4.2MHzの映像信号を記録
し、この再生出力が50%に減衰するまでの時間と
して測定した。
[Industrial Application Field] The present invention relates to a so-called ferromagnetic metal thin film type magnetic recording medium in which a ferromagnetic metal thin film is formed on a nonmagnetic support by vapor deposition, ion plating, sputtering, etc. . [Background technology and its problems] Traditionally, magnetic recording media have been made of r-Fe 2 O 3 , Co-containing r-Fe 2 O 3 , Co-containing material on a non-magnetic support.
Fe 3 O 4 , Fe 3 O 4 containing Co, r-Fe 2 O 3 and
Powder magnetic materials such as bertolide compounds of Fe 3 O 4 , bertolide compounds containing Co, oxide magnetic powders such as CrO 2 , or alloy magnetic powders whose main components are Fe, Co, Ni, etc., are mixed with vinyl chloride-acetic acid. Coating-type magnetic recording media, in which magnetic recording media are dispersed in an organic binder such as a vinyl copolymer, polyester resin, or polyurethane resin, coated, and dried, have been widely used. In recent years, with the increasing demand for high-density magnetic recording,
Ferromagnetic thin-film magnetic recording media, in which a thin metal film made of ferromagnetic metal is directly deposited on a non-magnetic support using vacuum evaporation, sputtering, ion plating, or plating, have been attracting attention. There is. This ferromagnetic metal thin film magnetic recording medium has coercive force.
Not only does it have high Hc and residual magnetic flux density Br, but the thickness of the magnetic layer can be made extremely thin, so the thickness loss during recording demagnetization and reproduction is extremely small, and the magnetic layer is made of non-magnetic material. It has many advantages in terms of magnetic properties, such as the ability to increase the packing density of the magnetic material since it is not necessary to mix an organic binder. However, in this type of magnetic recording medium, since a vacuum evaporation method or the like is used as a means of forming the ferromagnetic metal thin film, the base film, which is a non-magnetic support, is susceptible to thermal damage. However, when the evaporated metal atoms recrystallize to form a thin film, they shrink and generate internal stress, which causes the ferromagnetic metal thin film to curl into a concave shape. When such curling occurs, the contact between the magnetic recording medium and the magnetic head becomes poor, resulting in a reduction in the reproduction output and the occurrence of irregular winding. Therefore, various methods have been proposed to eliminate the above-mentioned curls. For example, it is disclosed in JP-A-53-83706, JP-A-53-104204, etc. that stress is applied after a magnetic thin film is deposited to cause a type of crack in the magnetic thin film to relieve strain stress. . Further, it is disclosed in Japanese Patent Laid-Open No. 16032/1983 that stress is relaxed by subjecting the substrate to heat treatment to shrink the substrate side after the magnetic thin film is deposited. In addition, it has been proposed in Japanese Patent Application Laid-Open No. 56-1997 that stress can be alleviated by providing a back coat layer on the back side of the magnetic recording medium, that is, on the side opposite to the magnetic layer.
-11622, JP-A-56-16939, etc. However, none of these methods can prevent curling during film formation and has many drawbacks in terms of productivity and other aspects. Curling during film formation is also a very serious problem when using other deposition methods other than vapor deposition, such as sputtering and ion plating, and a sufficient preventive measure has not yet been realized. In addition, in the case of the above-mentioned ferromagnetic metal thin film type magnetic recording medium, since the ferromagnetic metal that is the magnetic layer is manufactured using vacuum thin film formation technology, the surface thereof has extremely excellent smoothness, resulting in a so-called mirror surface state. It has been known. If the surface smoothness of the magnetic layer is improved in this manner, it is advantageous in terms of spacing loss, etc., but there is a risk that it may cause problems in terms of runnability and durability. In other words, if the surface of the magnetic layer becomes too smooth, adhesion (so-called sticking) will easily occur at the contact area with, for example, a magnetic head, guide post, rotating head cylinder, etc., and the actual contact area will be reduced. Since the friction coefficient is large, running properties are extremely deteriorated, and durability is also reduced accordingly. [Object of the Invention] The present invention has been proposed in view of the above-mentioned conventional situation, and is free from curling and provides stable running performance at the contact portion with magnetic heads, rotary head cylinders, etc. The object of the present invention is to provide a magnetic recording medium whose surface roughness can be easily controlled. [Means for Solving the Problems] That is, the present invention provides a method for producing polyurethane resins, polyester resins, vinylidene chloride resins, styrene-butadiene rubbers, and acrylonitrile-butadiene rubbers having a glass transition point of 30°C or less on a non-magnetic support. Magnetic recording characterized by forming an undercoat layer consisting of at least one selected resin binder and fine polymer particles having a particle size of 250 Å to 2000 Å, and forming a ferromagnetic metal thin film on the undercoat layer. It's about the medium. A magnetic recording medium according to the present invention is shown in FIG. In the figure, 1 is a non-magnetic support, 2 is a ferromagnetic metal thin film, 3 is a resin binder with a glass transition point of 30°C or less, and 4 is a non-magnetic support.
are polymer fine particles with a particle size of 250 Å to 2000 Å. The undercoat layer of the magnetic recording medium according to the present invention is composed of a resin binder 3 with a glass transition point (hereinafter referred to as Tg) of 30°C or lower and polymer fine particles 4 with a particle size of 250 Å to 2000 Å, and has a Tg of 30°C or lower. The resin binder 3 forms a continuous film, and the polymer fine particles 4 having a particle size of 250 Å to 2000 Å form granular protrusions. The continuous film made of the resin binder 3 is a ferromagnetic metal thin film 2 which is a magnetic layer.
It is softer than the non-magnetic support 1 and can disperse stress concentration occurring between the ferromagnetic metal thin film 2 and the non-magnetic support 1 and relax the stress, thereby suppressing curling. Moreover, the surface roughness of the surface of the ferromagnetic metal thin film 2 can be controlled by the granular projections, and the running properties of the magnetic recording medium can be improved. Furthermore, the durability of the magnetic recording medium can be improved by the undercoat layer. The thicker the continuous film made of the resin binder 3 with a Tg of 30°C or less, the less the amount of curl. However, as the continuous film becomes thicker, the surface smoothness deteriorates and the magnetic recording The electromagnetic conversion characteristics of will deteriorate. Therefore, it is desirable that the thickness of the continuous film is 1 μm or less. In addition, the particle density is important for the granular protrusions made of polymer fine particles 4 with a particle size of 250 Å to 2000 Å, and the granular protrusions are formed on the surface of the undercoat layer.
It is desirable that about 100,000 to 20 million pieces/mm 2 be formed. If the density of the granular projections is less than 100,000 pieces/mm 2 , no improvement in durability can be expected, and if the density of the granular protrusions is less than 20 million pieces/mm 2
Exceeding this will reduce the image quality. Furthermore, the particle size of the polymer is
It is preferably 250 Å to 2000 Å. Particle size is 250Å
If it is less than 2000Å, no improvement in durability can be expected.
Exceeding this will reduce the image quality. The undercoat layer according to the present invention is formed by coating the nonmagnetic support 1 with an undercoat paint in which a resin binder having a Tg of 30° C. or lower and fine polymer particles having a particle size of 250 Å to 2000 Å are dispersed in a solvent. Examples of the resin binder 3 having a Tg of 30° C. or less include polyurethane resin, polyester resin, vinylidene chloride resin, styrene-butadiene rubber, acrylonitrile-butadiene, and the like. As the polymer fine particles 4 having a particle size of 250 Å to 2000 Å,
Examples include styrene-divinylbenzene copolymer, benzoguanamine-formaldehyde condensate, polyvinyl chloride, and the like. Examples of solvents include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, alcohols such as methanol, ethanol, propanol, and butanol, and esters such as methyl acetate, ethyl acetate, ethyl lactate, and glycol monoethyl acetate. Ethers such as ethylene glycol dimethyl ether, ethylene glycol monoethyl ether, tetrahydrofuran, dioxane, benzene, toluene,
Aromatic hydrocarbons such as xylene, aliphatic hydrocarbons such as hexane and heptane, methylene chloride, ethylene chloride, carbon tetrachloride, chloroform,
Examples include chlorinated hydrocarbons such as ethylene chlorohydrin and dichlorobenzene, and nitropropane. Materials for the non-magnetic support 1 include polyesters such as polyethylene terephthalate, polyolehanes such as polyethylene and polypropylene, cellulose derivatives such as cellulose triacetate, cellulose diacetate, and cellulose acetate butyrate, polyvinyl chloride, polyvinylidene chloride, etc. Examples include plastics such as vinyl resin, polycarbonate, polyimide, and polyamideimide. The nonmagnetic support may be in any form such as a film, tape, sheet, disk, card, or drum. The materials for the ferromagnetic metal thin film 2 include Fe, Co,
Metals such as Ni or Co-Ni alloy, Fe-Co alloy,
Fe-Ni alloy, Fe-Co-Ni alloy, Fe-Co-B alloy, Co-Ni-Fe-B alloy or these with Cr,
Examples include those containing metals such as Al. The means for depositing the ferromagnetic metal thin film material is as follows:
Examples include a vacuum evaporation method, an ion plating method, and a sputtering method. The above vacuum evaporation method is
The above ferromagnetic metal material is evaporated by resistance heating, high frequency heating, electron beam heating, etc. under a vacuum of 10 -4 to 10 -8 Torr, and the evaporated metal (ferromagnetic metal material) is deposited on a non-magnetic support. It is roughly divided into oblique evaporation method and vertical evaporation method. The above-mentioned oblique deposition method is a method in which the above-mentioned ferromagnetic metal material is obliquely vapor-deposited on a non-magnetic support in order to obtain a high coercive force, and the above-mentioned vapor deposition is performed in an oxygen atmosphere in order to obtain a higher coercive force. Also includes things. In the vertical evaporation method mentioned above, in order to improve the evaporation efficiency and productivity and obtain high coercive force, Bi is pre-coated on a non-magnetic support.
A base metal layer such as Sb, Pb, Sn, Ga, In, Cd, Ge, Si, Tl, etc. is formed in advance, and the above-mentioned ferromagnetic metal material is vertically deposited on this base metal layer. The above-mentioned ion plating method is also a type of vacuum evaporation method, and involves generating DC glow discharge and RF glow discharge in an inert gas atmosphere of 10 -4 to 10 -3 Torr, and evaporating the above-mentioned ferromagnetic metal during the discharge. It is something. The above sputtering method is 10 -3 ~
A glow discharge is generated in an atmosphere mainly composed of argon gas at 10 -1 Torr, and the generated argon ions are used to knock out atoms on the target surface. , high-frequency sputtering method, and magnetron sputtering method using magnetron discharge. In addition, in order to improve the running properties of magnetic recording media,
It is also possible to form a lubricant layer on the surface of the ferromagnetic metal thin film 2 described above. As the lubricant, fatty acids, fatty acid esters, fatty acid amides, metal soaps, aliphatic alcohols, paraffins, silicones, fluorine surfactants, etc. can be used, and the amount of the lubricant applied is 1 to 1000 mg/ m2 . is preferable. Fatty acids include lauric acid, myristic acid,
Those having 12 or more carbon atoms such as palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, and linolenic acid can be used. Fatty acid esters include ethyl stearate, butyl stearate, amyl stearate,
Stearic acid monoglyceride, oleic acid monoglyceride, etc. can be used. Examples of fatty acid amides include caproic acid amide, capric acid amide, lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, oleic acid amide, linoleic acid amide, methylene bisstearic acid amide, ethylene bis stearic acid amide, etc. Can be used. Metal soaps include Zn, Pb, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, etc.
Salts with Ni, Co, Fe, Al, Mg, Sr, Cu, etc., salts of sulfonic acids such as lauryl, palmityl, myristyl, stearyl, behenyl, oleyl, linole, linolenic, etc. and the above metals, etc. can be used. As the aliphatic alcohol, cetyl alcohol, stearyl alcohol, etc. can be used. As the paraffin, saturated hydrocarbons such as n-nonadecane, n-tridecane, and n-docosane can be used. As silicones, polysiloxanes in which hydrogen is partially substituted with alkyl groups or phenyl groups, and those modified with fatty acids, aliphatic alcohols, fatty acid amides, etc. can be used. Examples of fluorosurfactants include salts of perfluoroalkyl carboxylic acids and perfluoroalkyl sulfonic acids with Na, K, Mg, Zn, Al, Fe, Co, Ni, etc., perfluoroalkyl phosphate esters, and perfluoroalkyl phosphates. Alkyl betaines, perfluoroalkyltrimethylammonium salts, perfluoroethylene oxide, perfluoroalkyl aliphatic esters, etc. can be used. [Examples] Specific examples of the present invention will be described below, but it goes without saying that the present invention is not limited to these examples. Example 1 Fine particles of styrene-divinylbenzene copolymer with a particle size of 300 Å and a glass transition point of -43°C were placed on a polyethylene terephthalate film with a thickness of 12 μm.
An undercoat paint containing a polyurethane resin dispersed in a 1:1:1 mixed solvent of methyl ethyl ketone, methyl isobutyl ketone, and toluene is applied, and the particle density is
An undercoat layer with a continuous film thickness of 100 Å was formed at 2 million pieces/mm 2 . Next, cobalt Co was obliquely evaporated onto the undercoat layer using a vacuum evaporation device at an incident angle of 50° to 90°, and the film thickness was approx.
A sample tape was created by forming a 1300 Å ferromagnetic metal thin film. Example 2 Fine particles of styrene-divinylbenzene copolymer with a particle size of 300 Å and a glass transition point of -28°C were placed on a polyethylene terephthalate film with a thickness of 12 μm.
An undercoat paint containing a polyester resin dispersed in a 1:1:1 mixed solvent of methyl ethyl ketone, methyl isobutyl ketone, and toluene is applied, and the particle density is
An undercoat layer with a continuous film thickness of 100 Å was formed at 2 million pieces/mm 2 . Next, a sample tape was prepared in the same manner as in Example 1. Example 3 On a polyethylene terephthalate film with a thickness of 12 μm, an undercoat in which fine particles of a benzoguanamine-formaldehyde condensate with a particle size of 400 Å and a vinylidene chloride resin with a glass transition point of -19°C are dispersed in tetrahydrofuran was applied. density is
An undercoat layer with a continuous film thickness of 200 Å was formed at 3 million pieces/mm 2 . Next, a sample tape was prepared in the same manner as in Example 1. Comparative example Cobalt Co was obliquely evaporated onto a 12 μm thick polyethylene terephthalate film at an incident angle of 50° to 90° using a vacuum evaporator to form a ferromagnetic metal thin film with a thickness of approximately 1300 Å, and a sample tape was created. did. When the amount of curl, still characteristics, and image quality of the sample tapes obtained in the above-mentioned Examples and Comparative Examples were measured, the results shown in the following table were obtained. The amount of curl was measured by the amount indicated by h in Figure 2 on a 1/2 inch wide magnetic recording medium, and the still characteristics were measured by recording a 4.2MHz video signal on a sample tape, and the playback output was attenuated to 50%. It was measured as the time until.
【表】
この表からも明らかなように、本発明を適用し
た各実施例においては、カールがほとんどなく、
耐久性の改善された強磁性金属薄膜型磁気記録媒
体が得られることが分かる。
〔発明の効果〕
上述の実施例の説明からも明らかなように、本
発明においては、ガラス転移点が30℃以下の樹脂
結合剤と高分子微粒子からなる下塗層を形成して
いるので、カールの解消と表面粗度のコントロー
ルが同時に達成され、走行性が磁気ヘツドへの当
りが極めて優れた磁気記録媒体が得られるのであ
る。[Table] As is clear from this table, in each example to which the present invention is applied, there is almost no curling,
It can be seen that a ferromagnetic metal thin film type magnetic recording medium with improved durability can be obtained. [Effects of the Invention] As is clear from the description of the above examples, in the present invention, the undercoat layer is formed of a resin binder with a glass transition point of 30°C or less and polymer fine particles, so that Elimination of curl and control of surface roughness can be achieved at the same time, resulting in a magnetic recording medium with extremely excellent running properties and contact with the magnetic head.
第1図は本発明を適用した磁気記録媒体の構成
を示す要部拡大断面図であり、第2図は強磁性金
属薄膜型の磁気記録媒体のカール状態を説明する
概略断面図である。
1…非磁性支持体、2…強磁性金属薄膜、3…
樹脂結合剤、4…高分子微粒子。
FIG. 1 is an enlarged sectional view of a main part showing the structure of a magnetic recording medium to which the present invention is applied, and FIG. 2 is a schematic sectional view illustrating a curled state of a ferromagnetic metal thin film type magnetic recording medium. 1...Nonmagnetic support, 2...Ferromagnetic metal thin film, 3...
Resin binder, 4...Polymer fine particles.
Claims (1)
あるポリウレタン樹脂、ポリエステル樹脂、塩化
ビニリデン樹脂、スチレン−ブタジエンゴム、ア
クリロニトリル−ブタジエンゴムより選ばれた少
なくとも1種よりなる樹脂結合剤と粒径250Å〜
2000Åの高分子微粒子よりなる下塗層を形成し、
該下塗層上に強磁性金属薄膜を形成したことを特
徴とする磁気記録媒体。1 A resin binder made of at least one selected from polyurethane resin, polyester resin, vinylidene chloride resin, styrene-butadiene rubber, acrylonitrile-butadiene rubber and particle size having a glass transition point of 30°C or lower on a non-magnetic support. 250Å~
Forming an undercoat layer made of 2000Å polymer fine particles,
A magnetic recording medium characterized in that a ferromagnetic metal thin film is formed on the undercoat layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13494484A JPS6113428A (en) | 1984-06-29 | 1984-06-29 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13494484A JPS6113428A (en) | 1984-06-29 | 1984-06-29 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6113428A JPS6113428A (en) | 1986-01-21 |
JPH0522966B2 true JPH0522966B2 (en) | 1993-03-31 |
Family
ID=15140206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13494484A Granted JPS6113428A (en) | 1984-06-29 | 1984-06-29 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6113428A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05314454A (en) * | 1992-05-08 | 1993-11-26 | Fuji Photo Film Co Ltd | Magnetic recording medium |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5992427A (en) * | 1982-11-18 | 1984-05-28 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
JPS5992428A (en) * | 1982-11-18 | 1984-05-28 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
-
1984
- 1984-06-29 JP JP13494484A patent/JPS6113428A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5992427A (en) * | 1982-11-18 | 1984-05-28 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
JPS5992428A (en) * | 1982-11-18 | 1984-05-28 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPS6113428A (en) | 1986-01-21 |
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