JPH056734B2 - - Google Patents
Info
- Publication number
- JPH056734B2 JPH056734B2 JP57226000A JP22600082A JPH056734B2 JP H056734 B2 JPH056734 B2 JP H056734B2 JP 57226000 A JP57226000 A JP 57226000A JP 22600082 A JP22600082 A JP 22600082A JP H056734 B2 JPH056734 B2 JP H056734B2
- Authority
- JP
- Japan
- Prior art keywords
- back layer
- parts
- magnetic recording
- polyoxyethylene
- layer
- 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 34
- 239000011230 binding agent Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- 239000002736 nonionic surfactant Substances 0.000 claims description 9
- 230000003746 surface roughness Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 239000002270 dispersing agent Substances 0.000 claims description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims description 2
- -1 polyoxyethylene Polymers 0.000 description 20
- 229920002635 polyurethane Polymers 0.000 description 11
- 229920001577 copolymer Polymers 0.000 description 10
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 9
- 239000004814 polyurethane Substances 0.000 description 9
- 229920001228 polyisocyanate Polymers 0.000 description 7
- 239000005056 polyisocyanate Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 5
- 239000000020 Nitrocellulose Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 229920001220 nitrocellulos Polymers 0.000 description 5
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 239000012461 cellulose resin Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 3
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical compound FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 description 2
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 2
- 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 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000005907 alkyl ester group Chemical group 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 2
- 235000010445 lecithin Nutrition 0.000 description 2
- 239000000787 lecithin Substances 0.000 description 2
- 229940067606 lecithin Drugs 0.000 description 2
- 125000005395 methacrylic acid group Chemical group 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 239000001818 polyoxyethylene sorbitan monostearate Substances 0.000 description 2
- 235000010989 polyoxyethylene sorbitan monostearate Nutrition 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000001593 sorbitan monooleate Substances 0.000 description 2
- 235000011069 sorbitan monooleate Nutrition 0.000 description 2
- 229940035049 sorbitan monooleate Drugs 0.000 description 2
- 150000005846 sugar alcohols Polymers 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 2
- DZKDPOPGYFUOGI-UHFFFAOYSA-N tungsten(iv) oxide Chemical compound O=[W]=O DZKDPOPGYFUOGI-UHFFFAOYSA-N 0.000 description 2
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 1
- CUNWUEBNSZSNRX-RKGWDQTMSA-N (2r,3r,4r,5s)-hexane-1,2,3,4,5,6-hexol;(z)-octadec-9-enoic acid Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO.OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO.CCCCCCCC\C=C/CCCCCCCC(O)=O.CCCCCCCC\C=C/CCCCCCCC(O)=O.CCCCCCCC\C=C/CCCCCCCC(O)=O CUNWUEBNSZSNRX-RKGWDQTMSA-N 0.000 description 1
- 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
- OYHQOLUKZRVURQ-NTGFUMLPSA-N (9Z,12Z)-9,10,12,13-tetratritiooctadeca-9,12-dienoic acid Chemical compound C(CCCCCCC\C(=C(/C\C(=C(/CCCCC)\[3H])\[3H])\[3H])\[3H])(=O)O OYHQOLUKZRVURQ-NTGFUMLPSA-N 0.000 description 1
- 229940008841 1,6-hexamethylene diisocyanate Drugs 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
- XZIIFPSPUDAGJM-UHFFFAOYSA-N 6-chloro-2-n,2-n-diethylpyrimidine-2,4-diamine Chemical compound CCN(CC)C1=NC(N)=CC(Cl)=N1 XZIIFPSPUDAGJM-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- APXYQFWNKAYRFS-UHFFFAOYSA-N C(C=C)(=O)O.ClC=COC=CCl Chemical compound C(C=C)(=O)O.ClC=COC=CCl APXYQFWNKAYRFS-UHFFFAOYSA-N 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- DQEFEBPAPFSJLV-UHFFFAOYSA-N Cellulose propionate Chemical compound CCC(=O)OCC1OC(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C1OC1C(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C(COC(=O)CC)O1 DQEFEBPAPFSJLV-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229920001213 Polysorbate 20 Polymers 0.000 description 1
- 229920001214 Polysorbate 60 Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- IYFATESGLOUGBX-YVNJGZBMSA-N Sorbitan monopalmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O IYFATESGLOUGBX-YVNJGZBMSA-N 0.000 description 1
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 description 1
- 239000004147 Sorbitan trioleate Substances 0.000 description 1
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- IJCWFDPJFXGQBN-RYNSOKOISA-N [(2R)-2-[(2R,3R,4S)-4-hydroxy-3-octadecanoyloxyoxolan-2-yl]-2-octadecanoyloxyethyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCCCCCCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCCCCCCCCCCCC IJCWFDPJFXGQBN-RYNSOKOISA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 229920006218 cellulose propionate Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- SSHMNHMNSPXAGX-UHFFFAOYSA-N ethene;2-octylphenol Chemical compound C=C.CCCCCCCCC1=CC=CC=C1O SSHMNHMNSPXAGX-UHFFFAOYSA-N 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- LRMHFDNWKCSEQU-UHFFFAOYSA-N ethoxyethane;phenol Chemical compound CCOCC.OC1=CC=CC=C1 LRMHFDNWKCSEQU-UHFFFAOYSA-N 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- YQEMORVAKMFKLG-UHFFFAOYSA-N glycerine monostearate Natural products CCCCCCCCCCCCCCCCCC(=O)OC(CO)CO YQEMORVAKMFKLG-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- SVUQHVRAGMNPLW-UHFFFAOYSA-N glycerol monostearate Natural products CCCCCCCCCCCCCCCCC(=O)OCC(O)CO SVUQHVRAGMNPLW-UHFFFAOYSA-N 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- TZMQHOJDDMFGQX-UHFFFAOYSA-N hexane-1,1,1-triol Chemical compound CCCCCC(O)(O)O TZMQHOJDDMFGQX-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 125000005113 hydroxyalkoxy group Chemical group 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 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
- 239000000463 material 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
- 239000003921 oil Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920000259 polyoxyethylene lauryl ether Polymers 0.000 description 1
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 description 1
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229940035044 sorbitan monolaurate Drugs 0.000 description 1
- 239000001570 sorbitan monopalmitate Substances 0.000 description 1
- 235000011071 sorbitan monopalmitate Nutrition 0.000 description 1
- 229940031953 sorbitan monopalmitate Drugs 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 229960005078 sorbitan sesquioleate Drugs 0.000 description 1
- 235000019337 sorbitan trioleate Nutrition 0.000 description 1
- 229960000391 sorbitan trioleate Drugs 0.000 description 1
- 239000001589 sorbitan tristearate Substances 0.000 description 1
- 235000011078 sorbitan tristearate Nutrition 0.000 description 1
- 229960004129 sorbitan tristearate Drugs 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 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
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/735—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
本発明は磁気記録媒体に関し、特にS/Nを低
下させることなく、摩擦係数を低下させ、走行耐
久性を向上させ且つ磁気記録テープの耳折れがな
く、又、ドロツプアウトが少なく、磁気記録テー
プのバツク面のけずれなどのない優れた磁気記録
テープに関する。
一般に、オーデイオ用、ビデオ用あるいはコン
ピユーター用の磁気記録テープにおいて、感度
(特に、高周波領域での出力)を改善するために
磁気記録層の表面が平滑に仕上げられている。し
かし、このような平滑な磁気記録テープは巻取
り、巻戻しの際に整然と巻き取られず、乱巻状態
を起こしやすい。このような磁気テープを使用す
ると、張力変動などにより走行性が悪くなり、出
力が変動する。また、テープの変形、損傷も起こ
りやすい。この欠点を防ぐために、磁気記録層と
反対側の支持体面にバツク層を設けた磁気記録テ
ープが提案されている。
しかしながら、従来より使用されているバツク
層は、けずれ、摩擦係数の増加、テープの折れな
どが生じやすく、又、表面電気抵抗が高いため、
静電気をおびやすく、そのため、塵埃、キズ等に
よりドロツプアウトが生じやすいので、更に改良
の余地がある。
また、一般に走行特性や走行耐久性を向上する
ことを目的として、バツク層を賦与すると磁気記
録媒体(特にテープ状のとき)がロール状に巻き
込まれたり、シート状で積み重ねられた場合、バ
ツク層の凹凸が磁性層表面に写り、磁性層の表面
性が損なわれ、このため磁性層媒体の電磁特性、
特にS/N特性が損なわれることが知られてい
る。S/N特性が低下するのは、しばしばバツク
層の走行特性を重んじる余り、その表面状態が粗
くしているが、このため磁気記録媒体を巻き込ん
だ状態や、積み重ねられた状態で保存または放置
すると、バツク層の凹凸が磁性層表面に写るから
である。
本発明の目的は、摩擦係数の増加しない、走行
耐久性の良い磁気記録媒体を提供するにある。
更に本発明の目的は、磁性媒体のS/N特性を
損なわないバツク層を有する磁気記録媒体を提供
するにある。
本発明の上記目的は、支持体の1面に強磁性粉
末を結合剤中に分散させた磁性層、他の面にバツ
ク層を有し、該バツク層が結合剤中に分散された
無機質粉末を含む磁気記録媒体において、前記バ
ツク層の表面粗さがRaにて0.1μ以下であり、か
つ前記バツク層の厚さが1.5μ以下であると共に、
前記無機質粉末は平均粒子サイズが0.8μ以下で非
イオン界面活性剤を分散剤として結合剤中に分散
させる事によつて達成される。
なお、バツク層としては、表面粗さがRaにて
0.1μ以下で、厚さが1.5μ以下であることが好まし
い。
本発明に用いられる非イオン界面活性剤として
は水溶液中でイオンに解離せず主としてOH基と
エーテル基からなる多価アルコール誘導体であ
り、エーテル型としてはポリオキシエチレンアル
キルエーテル類RO(C2H4O)oH
ポリオキシエチレンアルキルフエノールエーテ
ル類
The present invention relates to a magnetic recording medium, in particular, it reduces the coefficient of friction without reducing the S/N ratio, improves the running durability, prevents edge bending of the magnetic recording tape, has little dropout, and improves the running durability of the magnetic recording tape. This invention relates to an excellent magnetic recording tape with no scratches on the back surface. Generally, in magnetic recording tapes for audio, video, or computers, the surface of the magnetic recording layer is finished to be smooth in order to improve sensitivity (particularly output in a high frequency range). However, such a smooth magnetic recording tape is not wound neatly during winding and unwinding, and tends to wind irregularly. When such a magnetic tape is used, running properties deteriorate due to tension fluctuations, etc., and output fluctuates. Furthermore, the tape is easily deformed and damaged. In order to avoid this drawback, a magnetic recording tape has been proposed in which a back layer is provided on the side of the support opposite to the magnetic recording layer. However, conventionally used back layers tend to scratch, increase the coefficient of friction, and bend the tape, and also have high surface electrical resistance.
There is room for further improvement since it is susceptible to static electricity and is therefore prone to dropouts due to dust, scratches, etc. Additionally, in general, when a back layer is provided for the purpose of improving running characteristics and running durability, when a magnetic recording medium (particularly in the form of a tape) is wound into a roll or stacked in a sheet form, the back layer becomes The unevenness is reflected on the surface of the magnetic layer, impairing the surface properties of the magnetic layer, and thus impairing the electromagnetic properties of the magnetic layer medium.
In particular, it is known that S/N characteristics are impaired. The reason why the S/N characteristic deteriorates is because the running characteristics of the back layer are often given too much importance, and the surface condition of the back layer becomes rough. This is because the unevenness of the back layer is reflected on the surface of the magnetic layer. An object of the present invention is to provide a magnetic recording medium that does not increase the coefficient of friction and has good running durability. A further object of the present invention is to provide a magnetic recording medium having a back layer that does not impair the S/N characteristics of the magnetic medium. The above-mentioned object of the present invention is to have a magnetic layer on one side of a support having ferromagnetic powder dispersed in a binder, and a back layer on the other side, the back layer being made of inorganic powder dispersed in a binder. In the magnetic recording medium, the back layer has a surface roughness of Ra of 0.1 μ or less, and a thickness of the back layer of 1.5 μ or less,
The inorganic powder has an average particle size of 0.8 μm or less and is achieved by dispersing it in a binder using a nonionic surfactant as a dispersant. In addition, as for the back layer, the surface roughness is Ra.
The thickness is preferably 0.1μ or less, and preferably 1.5μ or less. The nonionic surfactants used in the present invention are polyhydric alcohol derivatives that do not dissociate into ions in an aqueous solution and mainly consist of OH groups and ether groups.As ether types, polyoxyethylene alkyl ethers RO (C 2 H 4 O) o H Polyoxyethylene alkyl phenol ethers
【式】がありエステ
ル型としてはポリオキシルエチレンアルキルエス
テル類RCOO(C2H4O)oHソルビタンアルキルエ
ステル類[Formula] The ester type is polyoxylethylene alkyl esters RCOO (C 2 H 4 O) o H sorbitan alkyl esters
【式】ポリ
オキシエチレンソルビタンアルキルエステル類
などがある。
なお、上記の一般式でRはアルキル基、nは整
数を表わす。
本発明に用いられる非イオン界面活性剤の具体
例としては、ポリオキシエチレンオイルエーテ
ル、ポリオキシエチレンセチルエーテル、ポリオ
キシエチレンステアリルエーテル、ポリオキシエ
チレンラウリルエーテル、ポリオキシエチレンノ
ニルフエニルエーテル、ポリオキシエチレンオク
チルフエノールエーテル、ポリオキシエチレンオ
クチルフエノールエーテル等のエーテル型非イオ
ン界面活性剤や、ポリオキシエチレンモノラウレ
ート、ポリオキシエチレンモノステアレート、ポ
リオキシエチレンモノオレエート、ポリエチレン
グリコール牛脂脂肪酸エステル、ソルビタンモノ
ラウレート、ソルビタンモノパルミテート、ソル
ビタンモノステアレート、ソルビタンモノオレエ
ート、ソルビタンセスキオレエート、ソルビタン
トリオレエート、ポリオキシエチレンソルビタン
モノラウレート、ポリオキシエチレンソルビタン
モノステアレート、ポリオキシエチレンソルビタ
ンモノオレエート、オキシエチレンオキシプロピ
レンブロツクポリマー、グリセロールモノステア
レート、ポリオキシエチレンジステアレート等の
エステル型非イオン界面活性剤がある。
本発明のバツク層に使用する無機質粉末として
は、カーボンブラツク粉末、グラフアイト、二酸
化タングステン、二硫化モリブデン、窒化ホウ
素、二酸化ケイ素、炭酸カルシウム、酸化アルミ
ニウム、酸化鉄、二酸化チタン、酸化マグネシウ
ム、酸化亜鉛、酸化カルシウム、リトポン、タル
ク、酸化第二錫などがある。
本発明に用いる、無機質粉末の平均粒子サイズ
は0.8μ以下が好ましく、特に好ましくは、0.4μ以
下である。
本発明の結合剤としては、従来当業界で知られ
た結合剤、たとえば熱可塑性樹脂、熱硬化性樹
脂、反応型樹脂或いはこれらの混合物が使用され
る。
熱可塑性樹脂としては、塩化ビニル−酢酸ビニ
ル共重合体、塩化ビニル−塩化ビニリデン共重合
体、塩化ビニル−アクリロニトリル共重合体、ア
クリル酸エステル−アクリロニトリル共重合体、
アクリル酸エステル−塩化ビニリデン共重合体、
アクリル酸エステル−スチレン共重合体、メタク
リル酸エステル−アクリロニトリル共重合体、メ
タクリル酸エステル−塩化ビニリデン共重合体、
メタクリル酸エステル−スチレン共重合体、ウレ
タンエラストマー、ポリ弗化ビニル、塩化ビニリ
デン−アクリロニトリル共重合体、ブタジエン−
アクリロニトリル共重合体、ポリアミド樹脂、ポ
リビニルブチラール、繊維素系樹脂(セルロース
アセテートブチレート、セルロースダイアセテー
ト、セルロースプロピオネート、ニトロセルロー
ス等)、スチレン−ブタジエン共重合体、ポリエ
ステル樹脂、クロロビニルエーテル−アクリル酸
エステル共重合体、アミノ樹脂、各種ゴム系樹脂
などである。
熱硬化型樹脂又は反応型樹脂としては、フエノ
ール樹脂、エポキシ樹脂、ポリウレタン硬化型樹
脂、尿素樹脂、メラミン樹脂、アルキツド樹脂、
アクリル系反応樹脂、ポリイソシアネート、ポリ
アミンなどである。
以上の中でも特に好ましくは、繊維素系樹脂、
熱可塑性ポリウレタンエラストマー及びポリイソ
シアネートの3成分系である。
繊維素系樹脂としては、ニトロセルロース等の
セルロース誘導体が適当で、これらは、耐熱性、
靭性、耐ブロツキング性を付与するのに役立つ。
熱可塑性ポリウレタンエラストマーとしては、
ほとんど全ての市販品を使用できる。即ち、フタ
ル酸、アジピン酸、二重化リノレイン酸、マレイ
ン酸の如き有機二塩基酸と、エチレングリコー
ル、プロピレングリコール、ブチレングリコー
ル、ジエチレングリコールなどのグリコール類又
はトリメチロールプロパン、、ヘキサントリオー
ル、グリセリン、トリメチロールエタン、ペンタ
エリスリトールなどの多価アルコール類との反応
によつて得られるポリエテルポリオールをトリレ
ンジイソシアネート、4,4′−ジフエニルメタジ
イソシアネート、ヘキサメチレンジイソシアネー
ト、メタキシリレンジイソシアネートの如きポリ
イソシアネート化合物によつてウレタン化したポ
リエステルポリウレタン樹脂及びポリエーテルポ
リウレタン樹脂、更に一般式()で示される分
子の滑格の中に[Formula] Polyoxyethylene sorbitan alkyl esters and so on. In addition, in the above general formula, R represents an alkyl group, and n represents an integer. Specific examples of nonionic surfactants used in the present invention include polyoxyethylene oil ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene Ether-type nonionic surfactants such as ethylene octyl phenol ether and polyoxyethylene octyl phenol ether, polyoxyethylene monolaurate, polyoxyethylene monostearate, polyoxyethylene monooleate, polyethylene glycol tallow fatty acid ester, and sorbitan. Monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate There are ester-type nonionic surfactants such as ester, oxyethylene oxypropylene block polymer, glycerol monostearate, and polyoxyethylene distearate. Inorganic powders used in the back layer of the present invention include carbon black powder, graphite, tungsten dioxide, molybdenum disulfide, boron nitride, silicon dioxide, calcium carbonate, aluminum oxide, iron oxide, titanium dioxide, magnesium oxide, and zinc oxide. , calcium oxide, lithopone, talc, and stannic oxide. The average particle size of the inorganic powder used in the present invention is preferably 0.8μ or less, particularly preferably 0.4μ or less. As the binder of the present invention, there may be used binders conventionally known in the art, such as thermoplastic resins, thermosetting resins, reactive resins, or mixtures thereof. Examples of the thermoplastic resin include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-acrylonitrile copolymer, acrylic ester-acrylonitrile copolymer,
Acrylic acid ester-vinylidene chloride copolymer,
Acrylic ester-styrene copolymer, methacrylic ester-acrylonitrile copolymer, methacrylic ester-vinylidene chloride copolymer,
Methacrylic acid ester-styrene copolymer, urethane elastomer, polyvinyl fluoride, vinylidene chloride-acrylonitrile copolymer, butadiene-
Acrylonitrile copolymer, polyamide resin, polyvinyl butyral, cellulose resin (cellulose acetate butyrate, cellulose diacetate, cellulose propionate, nitrocellulose, etc.), styrene-butadiene copolymer, polyester resin, chlorovinyl ether-acrylic acid These include ester copolymers, amino resins, and various rubber resins. Examples of thermosetting resins or reactive resins include phenolic resins, epoxy resins, polyurethane curable resins, urea resins, melamine resins, alkyd resins,
These include acrylic reactive resins, polyisocyanates, and polyamines. Among the above, particularly preferred are cellulose resins,
It is a three-component system consisting of a thermoplastic polyurethane elastomer and a polyisocyanate. As the cellulose resin, cellulose derivatives such as nitrocellulose are suitable, and these have heat resistance,
Helps impart toughness and blocking resistance. As a thermoplastic polyurethane elastomer,
Almost any commercially available product can be used. That is, organic dibasic acids such as phthalic acid, adipic acid, double linoleic acid, and maleic acid, and glycols such as ethylene glycol, propylene glycol, butylene glycol, and diethylene glycol, or trimethylolpropane, hexanetriol, glycerin, and trimethylolethane. , polyether polyol obtained by reaction with polyhydric alcohols such as pentaerythritol, with a polyisocyanate compound such as tolylene diisocyanate, 4,4'-diphenylmethadiisocyanate, hexamethylene diisocyanate, metaxylylene diisocyanate. Polyester polyurethane resin and polyether polyurethane resin that have been urethanized, and also in the sliding case of the molecule represented by the general formula ()
【式】環を有するものな
どが使用される。
〔(−−R−OOC−R1−OO)−nOROOCNH−R2
−NHCO−〕 ()
但しmは5〜100の整数、Rは炭素数1〜4個
のヒドロキシアルキル基又は炭素数1〜4個のヒ
ドロキシアルコキシル基を少くとも2個有する脂
環族又は芳香族化合物によつて導入される2価の
基、R1は[Formula] Those having a ring are used. [(−−R−OOC−R 1 −OO)− n OROOCNH−R 2
-NHCO-] () where m is an integer of 5 to 100, and R is an alicyclic or aromatic group having at least two hydroxyalkyl groups having 1 to 4 carbon atoms or hydroxyalkoxyl groups having 1 to 4 carbon atoms. The divalent group introduced by the compound, R 1 is
【式】又は[Formula] or
【式】R2は[Formula] R 2 is
【式】【formula】
【式】【formula】
【式】【formula】
【式】又は(−CH2)−o、nは4
〜6の整数である。
これらの分子量は5000〜500000、好ましくは
10000〜200000のものが有効である。これらのポ
リウレタンについては特開昭55−122234号公報に
記載されている。
更に、ポリイシアネートとしては、2,4−ト
リレンジイソシアネート、1,6−ヘキサメチレ
ンジイソシアネート、トリイソシアネート(たと
えば、日本ポリウレタン工業(株)製造のコロネート
L)などが使用できる。
結合剤の組成比は、バインダー100重量部に対
して、繊維素系樹脂が20〜80重量部、熱可塑性ポ
リウレタンエラストマーが20〜50重量部、ポリイ
ソシアネートが10〜50重量部が好ましい。
本発明で使用されるバツク層の無機質粉末と結
合剤との比率は、重量比で、4/1〜0.1/1の
範囲で使用できる。
本発明のバツク層は、単位体積当りの記録密度
を上げるために、磁気記録媒体の総厚味(磁性層
+支持体+バツク層)をできる限り薄くする様に
選ばれている。この様なバツク層の厚さは好まし
くは0.3〜1.5μである。
本発明においてバツク層の表面粗さがcut
off0.08mmの中心線平均粗さ(Ra)にて0.10μ以下
であると好ましい結果が得られる。
本発明によれば、前述した如き特性を持つ磁気
記録媒体が得られる。即ち、従来の技術によれ
ば、バツク層を薄くするとバツクが破壊されるが
(磁気記録媒体が走行するときバツク層が削れ
る)、本発明ではこの欠点は生じない。しかも、
本発明のバツク層を用いることにより、記録波長
1.3μの高密度記録においてもビデオS/Nが劣化
しない。
本発明の磁気記録媒体は特開昭52−108804号公
報に記載の材料、製法などにしたがつて調製する
ことができる。
次に本発明の実施例について説明する。実施例
中「部」は「重量部」を示す。
実施例
厚さ14μのポリエチレンテレフタレートベース
の表面に、コバルト含有γ−酸化鉄を含む磁性層
を、その反対側にバツク層を設けた。磁性層は、
乾燥後の厚みが5μになるように、バツク層は、
下記の組成にてボールミル分散機を用いて20時間
分散した。
CaCO3(平均粒径0.08μ) 80部
カーボンブラツク(商品名旭#70旭カーボン(株)
製) 20部
ニトロセルロース 30部
ポリウレタン(商品名N−2301日本ポリウレタ
ン製) 15部
非イオン界面活性剤(※1) 2部
(メチルエチルケトン上記組成で分散后 300部
ポリイソシアネート(商品名コロネートL日本
ポリウレタン製) 25部
を投入し、バツクコート用塗布液とし乾燥厚0.8μ
となる様にバツク層として塗布した。
(※1)は第1表に示すものを選んでテストし
た。
第 1 表
A ソルビタンモノラウレート
B ソルビタンモノオレエート
C ソルビタントリステアレート
D ポリオキシエチレンモノラウレート
Eポリオキシエチレンソルビタンモノステア
レート
比較例
CaCO3(平均粒径0.08μ) 80部
カーボンブラツク(旭#70旭カーボン製) 20部
ニトロセルロース 30部
ポリウレタン(商品名:ニツポラン2301、日本
ポリウレタン(株)製造 15部
メチルエチルケトン 300部
実施例同様上記組成にてボールミル分散機を用
いて、20時間分散后下記硬化剤を添加しバツク液
とした。
ポリイソシアネート(商品名:コロネートL、
日本ポリウレタン(株)製造) 25部
このバツク液を実施例同様の磁性層を設けた反
対面に、厚さ0.8μの乾燥厚となる様に塗布した。
比較例
CaCO3(平均粒径0.08μ) 80部
カーボンブラツク(旭#70 旭カーボン製)
20部
ニトロセルロース 30部
ポリウレタン(N−2301日本ポリウレタン製)
15部
メチルエチルケトン 300部
レシチン 2部
実施例同様上記組成にてボールミル分散液にて
20時間分散后:下記硬化剤を添加しバツク液とし
実施例同様の磁性層を設けた反対面に厚さ0.8μの
乾燥厚となる様に塗布した。
試験方法
各磁気記録テープのバツク層の表面粗さをcut
off0.8mmの触針式表面粗さ計を用いて測定した。
試験方法
各磁気記録テープのS/Nを測定した、比較例
をOdBとして値を示した。
試験方法
VHSビデオデツキを100パス及び300パス走行
させた後のバツクコート面の摩擦状態及び損障状
態を調べた。得られた結果を第2表に示した。[Formula] or (-CH 2 ) -o , n is an integer from 4 to 6. Their molecular weight is between 5000 and 500000, preferably
10000 to 200000 is valid. These polyurethanes are described in JP-A-55-122234. Further, as the polyisocyanate, 2,4-tolylene diisocyanate, 1,6-hexamethylene diisocyanate, triisocyanate (for example, Coronate L manufactured by Nippon Polyurethane Industry Co., Ltd.), etc. can be used. The composition ratio of the binder is preferably 20 to 80 parts by weight of the cellulose resin, 20 to 50 parts by weight of the thermoplastic polyurethane elastomer, and 10 to 50 parts by weight of the polyisocyanate, based on 100 parts by weight of the binder. The ratio of the inorganic powder to the binder in the back layer used in the present invention can range from 4/1 to 0.1/1 by weight. The back layer of the present invention is selected so as to make the total thickness (magnetic layer + support + back layer) of the magnetic recording medium as thin as possible in order to increase the recording density per unit volume. The thickness of such a back layer is preferably between 0.3 and 1.5 microns. In the present invention, the surface roughness of the back layer is cut.
Favorable results can be obtained if the center line average roughness (Ra) of off0.08 mm is 0.10μ or less. According to the present invention, a magnetic recording medium having the characteristics described above can be obtained. That is, according to the prior art, when the back layer is thinned, the back layer is destroyed (the back layer is scraped when the magnetic recording medium runs), but this drawback does not occur in the present invention. Moreover,
By using the back layer of the present invention, the recording wavelength can be
Video S/N does not deteriorate even in high-density recording of 1.3μ. The magnetic recording medium of the present invention can be prepared according to the materials and manufacturing method described in JP-A-52-108804. Next, examples of the present invention will be described. In the examples, "parts" indicate "parts by weight." Example A magnetic layer containing cobalt-containing γ-iron oxide was provided on the surface of a polyethylene terephthalate base having a thickness of 14 μm, and a back layer was provided on the opposite side. The magnetic layer is
The back layer is made so that the thickness after drying is 5μ.
The following composition was dispersed for 20 hours using a ball mill disperser. CaCO 3 (average particle size 0.08μ) 80 parts Carbon Black (Product name Asahi #70 Asahi Carbon Co., Ltd.)
20 parts Nitrocellulose 30 parts Polyurethane (Product name N-2301 manufactured by Nippon Polyurethane) 15 parts Nonionic surfactant (*1) 2 parts (Methyl ethyl ketone After dispersing in the above composition) 300 parts Polyisocyanate (Product name Coronate L Nippon Polyurethane) 25 parts of the product was added to make a back coat coating solution with a dry thickness of 0.8 μm.
It was applied as a back layer so that (*1) We selected and tested those shown in Table 1. Table 1 A Sorbitan monolaurate B Sorbitan monooleate C Sorbitan tristearate D Polyoxyethylene monolaurate E Polyoxyethylene sorbitan monostearate comparative example CaCO 3 (average particle size 0.08μ) 80 parts Carbon Black (Asahi) #70 manufactured by Asahi Carbon) 20 parts Nitrocellulose 30 parts Polyurethane (Product name: Nitsuporan 2301, manufactured by Nippon Polyurethane Co., Ltd.) 15 parts Methyl ethyl ketone 300 parts After dispersing for 20 hours using a ball mill dispersion machine with the above composition as in the example below. A hardening agent was added to make a backing solution.Polyisocyanate (product name: Coronate L,
(Manufactured by Nippon Polyurethane Co., Ltd.) 25 parts This backing liquid was applied to the opposite side of the magnetic layer similar to the example in order to have a dry thickness of 0.8 μm. Comparative example CaCO 3 (average particle size 0.08μ) 80 parts carbon black (Asahi #70 manufactured by Asahi Carbon)
20 parts nitrocellulose 30 parts polyurethane (manufactured by N-2301 Nippon Polyurethane)
15 parts Methyl ethyl ketone 300 parts Lecithin 2 parts Ball mill dispersion using the above composition as in the example
After 20 hours of dispersion: The following curing agent was added and used as a backing solution, which was coated to a dry thickness of 0.8 μm on the opposite side of the magnetic layer provided in the same manner as in the example. Test method: Cut the surface roughness of the back layer of each magnetic recording tape.
It was measured using a stylus type surface roughness meter with an off of 0.8 mm. Test method The S/N of each magnetic recording tape was measured, and the value of the comparative example was expressed as OdB. Test method After running the VHS video deck for 100 passes and 300 passes, the friction and damage state of the back court surface was investigated. The results obtained are shown in Table 2.
【表】
以上の結果から次のことが理解される。
(1) 実施例に用いた非イオン界面活性剤は、表面
粗さ、S/N値から明らかの様に、分散性が良
いことがわかる。
特に、分散剤なしの比較例では分散時間を
倍にしても、表面粗さは実施例の値に達せず
S/Nも低く、実施例の界面活性剤の効果があ
ることがわかる。
(2) バツク層の摩耗状態を比較してみると、
100passで本発明により非イオン界面活性剤を
用いた場合はすじがほとんどみられず300pass
に於ても、実用上問題ないレベルで、良好であ
る。
この理由は明確ではないが、比較例の一般的
分散剤レシチンのデーターと比較してみると、本
発明により用いた界面活性剤が、バツク層表面に
出易く耐すり傷性をも良化していると考えられ
る。[Table] From the above results, the following can be understood. (1) It can be seen that the nonionic surfactant used in the examples has good dispersibility, as is clear from the surface roughness and S/N value. In particular, in the comparative example without a dispersant, even if the dispersion time was doubled, the surface roughness did not reach the value of the example and the S/N was low, indicating that the surfactant of the example was effective. (2) Comparing the wear conditions of the back layer,
When using the nonionic surfactant according to the present invention after 100 passes, almost no streaks were seen and after 300 passes
The results are also good, at a level that poses no practical problems. The reason for this is not clear, but when compared with the data of the general dispersant lecithin in the comparative example, it is found that the surfactant used in the present invention tends to appear on the surface of the back layer and improves the scratch resistance. It is thought that there are.
Claims (1)
させた磁性層、他の面にバツク層を有し、該バツ
ク層が結合剤中に分散された無機質粉末を含む磁
気記録媒体において、前記バツク層の表面粗さが
Raにて0.1μ以下でありかつ前記バツク層の厚さ
が1.5μ以下であると共に、前記無機質粉末は平均
粒子サイズが0.8μ以下で非イオン界面活性剤を分
散剤として結合剤中に分散されていることを特徴
とする磁気記録媒体。1. A magnetic recording medium having a magnetic layer in which ferromagnetic powder is dispersed in a binder on one side of a support and a back layer on the other side, and the back layer includes inorganic powder dispersed in the binder. , the surface roughness of the back layer is
Ra is 0.1μ or less, the thickness of the back layer is 1.5μ or less, and the inorganic powder has an average particle size of 0.8μ or less and is dispersed in a binder using a nonionic surfactant as a dispersant. A magnetic recording medium characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57226000A JPS59116929A (en) | 1982-12-24 | 1982-12-24 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57226000A JPS59116929A (en) | 1982-12-24 | 1982-12-24 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59116929A JPS59116929A (en) | 1984-07-06 |
JPH056734B2 true JPH056734B2 (en) | 1993-01-27 |
Family
ID=16838217
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57226000A Granted JPS59116929A (en) | 1982-12-24 | 1982-12-24 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59116929A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5593533A (en) * | 1978-12-13 | 1980-07-16 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
JPS5740743A (en) * | 1980-08-23 | 1982-03-06 | Sony Corp | Magnetic recording medium |
JPS57130234A (en) * | 1981-02-02 | 1982-08-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
-
1982
- 1982-12-24 JP JP57226000A patent/JPS59116929A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5593533A (en) * | 1978-12-13 | 1980-07-16 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
JPS5740743A (en) * | 1980-08-23 | 1982-03-06 | Sony Corp | Magnetic recording medium |
JPS57130234A (en) * | 1981-02-02 | 1982-08-12 | Fuji Photo Film Co Ltd | Magnetic recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPS59116929A (en) | 1984-07-06 |
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