JPS63171417A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS63171417A JPS63171417A JP181887A JP181887A JPS63171417A JP S63171417 A JPS63171417 A JP S63171417A JP 181887 A JP181887 A JP 181887A JP 181887 A JP181887 A JP 181887A JP S63171417 A JPS63171417 A JP S63171417A
- Authority
- JP
- Japan
- Prior art keywords
- parts
- acid
- weight
- magnetic
- polyurethane resin
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 43
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 29
- 239000011230 binding agent Substances 0.000 claims abstract description 22
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 20
- 239000006185 dispersion Substances 0.000 abstract description 10
- 239000006229 carbon black Substances 0.000 abstract description 7
- 230000003746 surface roughness Effects 0.000 abstract description 3
- 239000000945 filler Substances 0.000 abstract description 2
- 239000011247 coating layer Substances 0.000 abstract 3
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 239000010410 layer Substances 0.000 abstract 1
- -1 iron oxide Chemical class 0.000 description 26
- 229920005862 polyol Polymers 0.000 description 21
- 150000003077 polyols Chemical class 0.000 description 20
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 18
- 239000002253 acid Substances 0.000 description 14
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 239000003973 paint Substances 0.000 description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000006249 magnetic particle Substances 0.000 description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 5
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920001228 polyisocyanate Polymers 0.000 description 5
- 239000005056 polyisocyanate Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 4
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004970 Chain extender Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 229910052770 Uranium Inorganic materials 0.000 description 3
- 150000008065 acid anhydrides Chemical class 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 150000002009 diols Chemical class 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N oxalic acid group Chemical group C(C(=O)O)(=O)O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229920005906 polyester polyol Polymers 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 125000004018 acid anhydride group Chemical group 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 125000002947 alkylene group Chemical group 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 2
- 150000001991 dicarboxylic acids Chemical class 0.000 description 2
- 125000005442 diisocyanate group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 2
- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 description 2
- 229920001220 nitrocellulos Polymers 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XNLICIUVMPYHGG-UHFFFAOYSA-N pentan-2-one Chemical compound CCCC(C)=O XNLICIUVMPYHGG-UHFFFAOYSA-N 0.000 description 2
- FDPIMTJIUBPUKL-UHFFFAOYSA-N pentan-3-one Chemical compound CCC(=O)CC FDPIMTJIUBPUKL-UHFFFAOYSA-N 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
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- KIDHWZJUCRJVML-UHFFFAOYSA-N putrescine Chemical compound NCCCCN KIDHWZJUCRJVML-UHFFFAOYSA-N 0.000 description 2
- CYIDZMCFTVVTJO-UHFFFAOYSA-N pyromellitic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O CYIDZMCFTVVTJO-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical group 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 2
- XFNJVJPLKCPIBV-UHFFFAOYSA-N trimethylenediamine Chemical compound NCCCN XFNJVJPLKCPIBV-UHFFFAOYSA-N 0.000 description 2
- JNYAEWCLZODPBN-KVTDHHQDSA-N (2r,3r,4r)-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-KVTDHHQDSA-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
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- ZKSBDEFDWSDNPW-UHFFFAOYSA-N 1-butoxy-2,4-diisocyanatobenzene Chemical compound CCCCOC1=CC=C(N=C=O)C=C1N=C=O ZKSBDEFDWSDNPW-UHFFFAOYSA-N 0.000 description 1
- SZBXTBGNJLZMHB-UHFFFAOYSA-N 1-chloro-2,4-diisocyanatobenzene Chemical compound ClC1=CC=C(N=C=O)C=C1N=C=O SZBXTBGNJLZMHB-UHFFFAOYSA-N 0.000 description 1
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 1
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- DZDVHNPXFWWDRM-UHFFFAOYSA-N 2,4-diisocyanato-1-methoxybenzene Chemical compound COC1=CC=C(N=C=O)C=C1N=C=O DZDVHNPXFWWDRM-UHFFFAOYSA-N 0.000 description 1
- VXQILLTWRZPRQF-UHFFFAOYSA-N 2,4-diisocyanato-1-propan-2-ylbenzene Chemical compound CC(C)C1=CC=C(N=C=O)C=C1N=C=O VXQILLTWRZPRQF-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- FALRKNHUBBKYCC-UHFFFAOYSA-N 2-(chloromethyl)pyridine-3-carbonitrile Chemical compound ClCC1=NC=CC=C1C#N FALRKNHUBBKYCC-UHFFFAOYSA-N 0.000 description 1
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 description 1
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 1
- HEBKCHPVOIAQTA-QWWZWVQMSA-N D-arabinitol Chemical compound OC[C@@H](O)C(O)[C@H](O)CO HEBKCHPVOIAQTA-QWWZWVQMSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- ODBLHEXUDAPZAU-ZAFYKAAXSA-N D-threo-isocitric acid Chemical compound OC(=O)[C@H](O)[C@@H](C(O)=O)CC(O)=O ODBLHEXUDAPZAU-ZAFYKAAXSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 239000004386 Erythritol Substances 0.000 description 1
- UNXHWFMMPAWVPI-UHFFFAOYSA-N Erythritol Natural products OCC(O)C(O)CO UNXHWFMMPAWVPI-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- ODBLHEXUDAPZAU-FONMRSAGSA-N Isocitric acid Natural products OC(=O)[C@@H](O)[C@H](C(O)=O)CC(O)=O ODBLHEXUDAPZAU-FONMRSAGSA-N 0.000 description 1
- 239000005058 Isophorone diisocyanate Substances 0.000 description 1
- 229930195725 Mannitol Natural products 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、磁気記録媒体に係り、更に詳細には、巻き乱
れ防止や帯電防止等のために磁性層と反対側の面に設け
られる所謂バックコート層の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a magnetic recording medium, and more specifically, a so-called magnetic recording medium is provided on the surface opposite to a magnetic layer to prevent winding irregularities, prevent charging, etc. This invention relates to improvement of the back coat layer.
（従来の技術）
カセットテープ、オーブンリールテープ、ビデオテープ
、磁気カード、磁気ディスク等の磁気記録媒体は、オー
ディオ分野、ビデオ分野、コンピュータ分野において広
く使用されている。(Prior Art) Magnetic recording media such as cassette tapes, oven reel tapes, video tapes, magnetic cards, and magnetic disks are widely used in the audio, video, and computer fields.
例えば、オーディオ分野、ビデオ分野で一般に使用され
ている磁気テープは、ポリエステル、ポリ塩化ビニル、
ポリアセテート等の非磁性支持体上に酸化鉄等の磁気化
可能な金属酸化物若しくは金属材、結合剤、分散剤等を
有機溶媒中に分散せしめてなる磁性塗料をコーティング
したり、強磁性金属を真空蒸着等の手段で直接コーティ
ングする等して磁性層を形成している。For example, magnetic tapes commonly used in the audio and video fields are made of polyester, polyvinyl chloride,
A non-magnetic support such as polyacetate is coated with a magnetic paint made by dispersing a magnetizable metal oxide or metal material such as iron oxide, a binder, a dispersant, etc. in an organic solvent, or a ferromagnetic metal The magnetic layer is formed by directly coating the material by means such as vacuum evaporation.
このようなテープ形状の磁気記録媒体においては、テー
プの走行安定性、巻き乱れ防止、帯電防止等のために、
前記非磁性支持体の磁性層を設けていない側の結合剤中
にカーボンブラック、二酸化チタン、グラファイトアル
ミナ等を混合した塗工剤をコーティングしたバックコー
ト層を設けるととが知られている。In such tape-shaped magnetic recording media, in order to stabilize the running of the tape, prevent irregular winding, prevent static electricity, etc.
It is known to provide a back coat layer coated with a coating agent containing carbon black, titanium dioxide, graphite alumina, etc. in a binder on the side of the non-magnetic support on which the magnetic layer is not provided.
そして、従来、バックコート層を形成するための結合剤
としては、主としてポリ塩化ビニル系樹脂、ポリウレタ
ン系樹脂、ポリエステル系樹脂、ニトロセルロース系樹
脂、エポキシ系樹脂等が単独又は併用で使用されている
。Conventionally, as binders for forming the back coat layer, polyvinyl chloride resins, polyurethane resins, polyester resins, nitrocellulose resins, epoxy resins, etc. have been used singly or in combination. .
（発明が解決しようとしている問題点）前記した従来の
バックコート層形成用の結合剤としては、ポリウレタン
系樹脂も使用されているが、結合剤中に配合されたカー
ボンブラック等の分散性が十分でなく、走行耐久性や表
面粗さ等に問題かあり、ＳＮ比の劣化やドロップアウト
の増加、バックコート層の摩耗、粉落ち、巻き乱れ等が
生じ易いものであった。(Problem to be solved by the invention) Polyurethane resins are also used as binders for forming the conventional back coat layer, but the dispersibility of carbon black etc. blended into the binders is insufficient. However, there were problems with running durability, surface roughness, etc., and deterioration of the S/N ratio, increase in dropouts, abrasion of the back coat layer, powder falling, irregular winding, etc. were likely to occur.
本発明者等は前記した従来の磁気記録媒体の有する欠点
を解消するために鋭意研究を進めた結果、結合剤として
特定のポリウレタン系樹脂を使用することによって、カ
ーボンブラック等の分散安定性が良好で、ＳＮ比の劣化
やドロップアウト増加等の磁性層に対する悪影習の少な
いバックコート層を存する磁気記録媒体が得られること
を知見して本発明に到達した。The inventors of the present invention have carried out intensive research to eliminate the drawbacks of the conventional magnetic recording media described above, and have found that by using a specific polyurethane resin as a binder, the dispersion stability of carbon black, etc. is improved. The present invention was achieved based on the discovery that a magnetic recording medium having a back coat layer that has less negative effects on the magnetic layer such as deterioration of the S/N ratio and increase in dropout can be obtained.
（問題点を解決するための手段）
すなわち、本発明は、非磁性支持体の一方の面に磁性層
を設け、他方の面にバックコート層を設けてなる磁気記
録媒体において、上記バックコート層の結合剤か、エス
テル結合を介して主鎖に結合したカルボキシル基を有す
るポリウレタン系樹脂を含有することを特徴とする磁気
記録媒体である。(Means for Solving the Problems) That is, the present invention provides a magnetic recording medium in which a magnetic layer is provided on one surface of a non-magnetic support and a back coat layer is provided on the other surface. A magnetic recording medium characterized by containing a binder or a polyurethane resin having a carboxyl group bonded to the main chain via an ester bond.
本発明を更に詳細に説明すると、本発明で使用し、本発
明を第一に特徴づける結合剤は、エステル結合を介して
主ｊｎに結合したカルボキシル基を有するポリウレタン
系樹脂である。To explain the present invention in more detail, the binder used in the present invention and which primarily characterizes the present invention is a polyurethane resin having a carboxyl group bonded to the main jn via an ester bond.
このような特定のポリウレタン系樹脂はいずれの方法に
よって調製してもよいが、好ましい製造方法は、常法に
従ってポリオールと有機ポリイソシアネート化合物から
、必要に応じて鎖伸長剤を用いてポリウレタン系樹脂を
製造するに際して、ポリオールの主鎖にエステル結合を
介してカルボキシル基を存するポリオールを用いること
によって製造することができる。Such a specific polyurethane resin may be prepared by any method, but a preferred manufacturing method is to prepare a polyurethane resin from a polyol and an organic polyisocyanate compound according to a conventional method, using a chain extender as necessary. During production, it can be produced by using a polyol having a carboxyl group in the main chain of the polyol via an ester bond.
上記のカルボキシル基を有するポリオールは、３官能以
上の水酸基を有するポリオールに各種のポリカルボン酸
、好ましくは分子内に酸無水物基を有するポリカルボン
酸を、ポリオールの水酸基が少なくとも２個残るように
反応させて得られるものである。The above polyol having a carboxyl group is prepared by adding various polycarboxylic acids, preferably a polycarboxylic acid having an acid anhydride group in the molecule, to a polyol having a trifunctional or more functional hydroxyl group, so that at least two hydroxyl groups remain in the polyol. It is obtained by reaction.
好ましいポリオールは、グリセリン、ジグリセリン、ポ
リグリセリン、エリトリット、ペンタエリトリット、ア
ラビット、ソルビット、ソルビタン、マンニット、マン
ニタン、トリメチロールプロパン等の３価以上のアルコ
ール或いはこれらのアルコールを開始剤としてエチレン
オキサイド、プロピレンオキサイド、ブチレンオキサイ
ド等のアルキレンオキサイドを重合せしめたポリエーテ
ルポリオール、これらの多価アルコール又はポリエーテ
ルポリオールとジカルボン酸からなる３価以上の水酸基
を有するポリエステルポリオール、有機ポリアミンを開
始剤とした上記のアルキレンオキサイドの重合体、該重
合体とジカルボン酸とから得られる３価以上の水酸基を
有するポリエステルポリオール等が挙げられる。Preferred polyols include trihydric or higher alcohols such as glycerin, diglycerin, polyglycerin, erythritol, pentaerythritol, arabitol, sorbitol, sorbitan, mannitol, mannitan, trimethylolpropane, or ethylene oxide using these alcohols as an initiator. Polyether polyols obtained by polymerizing alkylene oxides such as propylene oxide and butylene oxide, polyester polyols containing trivalent or higher hydroxyl groups consisting of these polyhydric alcohols or polyether polyols and dicarboxylic acids, and the above-mentioned polyester polyols containing an organic polyamine as an initiator. Examples include alkylene oxide polymers, polyester polyols having trivalent or higher hydroxyl groups obtained from the polymers and dicarboxylic acids, and the like.
本発明において、これらのポリオール中で特に好ましい
ものは分子量が約９０〜４，０００のポリエーテルトリ
オールである。In the present invention, polyether triols having a molecular weight of about 90 to 4,000 are particularly preferred among these polyols.
また、上記のポリオールと反応させるポリカルボン酸と
しては２個以上のカルボキシル基を存するポリカルボン
酸はいずれも使用できるものであり、好ましいものとし
ては、例えば、シュウ酸。Further, as the polycarboxylic acid to be reacted with the above-mentioned polyol, any polycarboxylic acid having two or more carboxyl groups can be used, and a preferable example is oxalic acid.
マロン酸、コハク酸、グルタル酸、アジピン酸、ピメリ
ン酸、スペリン酸、アゼライン酸、セバシン酸、フマル
酸、マレイン酸、メチルマレイン酸、メチルフマル酸、
イタコン酸、シトラコン酸、メサコン酸、アセチレン酸
、リンゴ酸、メチルリンゴ酸、クエン酸、イソクエン酸
、酒石酸、フタル酸、イソフタル酸、テレフタル酸、ト
リメリット酸、ピロメリット酸、ナフタレンジカルボン
酸及びそれらのアルキルエステル、酸ハロゲン化物、酸
無水物等が挙番ブられ、本発明において最も好ましいも
のは上記のポリカルボン酸のうち酸無水物基を有し得る
ものポリカルボン酸の酸無水物である。Malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, speric acid, azelaic acid, sebacic acid, fumaric acid, maleic acid, methylmaleic acid, methylfumaric acid,
Itaconic acid, citraconic acid, mesaconic acid, acetylenic acid, malic acid, methylmalic acid, citric acid, isocitric acid, tartaric acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, naphthalene dicarboxylic acid and their Examples include alkyl esters, acid halides, acid anhydrides, etc., and the most preferred in the present invention are the acid anhydrides of polycarboxylic acids which can have an acid anhydride group among the above-mentioned polycarboxylic acids.
以上の如きポリオールと上記の如きポリ力ルポン酸との
反応は、得られるカルボン酸変性ポリオールがジオール
になる割合、例えば、トリオール１モルに対してジカル
ボン酸の酸無水物１モル割合て反応させるのが好ましい
。ポリオールとポリカルボン酸、特にポリカルボン酸の
酸無水物との反応は極めて容易であり、常法に従って行
えばよく、またこのようなポリオールとポリカルボン酸
との反応は、ポリウレタン系樹脂の製造中又は製造後に
行ってもよい。最も好ましいものは、ポリウレタン系樹
脂の製造前に、予めポリオールをカルボン酸変性してお
くことである。The reaction between the polyol as described above and the polyhydric acid as described above is carried out at a ratio in which the resulting carboxylic acid-modified polyol becomes a diol, for example, at a ratio of 1 mole of dicarboxylic acid anhydride to 1 mole of triol. is preferred. The reaction between a polyol and a polycarboxylic acid, especially an acid anhydride of a polycarboxylic acid, is extremely easy and can be carried out according to a conventional method. Alternatively, it may be performed after manufacturing. The most preferable method is to modify the polyol with carboxylic acid in advance before producing the polyurethane resin.
本発明で使用するカルボキシル基を有するポリウレタン
系樹脂は、上記の如きカルボキシル基を有するポリオー
ル（但し、カルボキシル変性はポリウレタン系樹脂の製
造中或いは製造後に行ってもよい）を使用して、常法に
従って有機ポリイソシアネート化合物と反応させ、及び
必要に応じて鎖伸長剤を併用してポリウレタン系樹脂を
製造することによって容易に得ることができる。尚、上
記のカルボキシル基は、アルカリ金属塩、アンモニウム
塩、有機アミン等の塩でもよい。The carboxyl group-containing polyurethane resin used in the present invention is produced by a conventional method using a carboxyl group-containing polyol as described above (carboxyl modification may be carried out during or after the production of the polyurethane resin). It can be easily obtained by producing a polyurethane resin by reacting it with an organic polyisocyanate compound and, if necessary, using a chain extender. Note that the above carboxyl group may be a salt of an alkali metal salt, an ammonium salt, an organic amine, or the like.
本発明において使用する有機ポリイソシアネートとは、
脂肪族或いは芳香族化合物中に少なくとも２個のイソシ
アネート基を有する化合物であって、従来からポリウレ
タン系樹脂の合成原料として広く使用されているもので
ある。The organic polyisocyanate used in the present invention is
It is a compound having at least two isocyanate groups in an aliphatic or aromatic compound, and has been widely used as a synthetic raw material for polyurethane resins.
これらの公知の有機ポリイソシアネートはいずれも本発
明において有用である。特に好ましい有機ポリイソシア
ネートを挙げれば以下の通りである。Any of these known organic polyisocyanates are useful in the present invention. Particularly preferred organic polyisocyanates are as follows.
トリレンジイソシアネート、
４−メトキシ−１，３−フェニレンジイソシアネート、
４−イソプロピル−１，３−フェニレンジイソシアネー
ト、
４−クロル−１，３−フェニレンジイソシアネート、
４−ブトキシ−１，３−フェニレンジイソシアネート、
２．４−ジイソシアネートージフェニルエーテメシチレ
ンジイソシアネート、
４．４′−メチレンビス（フェニルイソシアネート）、
シュリレンジイソシアネート、
１．５−ナフタレンジイソシアネート、ベンジジンジイ
ソシアネート、
０−ニトロベンジジンジイソシアネート、４．４−ジイ
ソシアネートジベンジル、１．４−テトラメチレンジイ
ソシアネート、１．６−テトラメチレンジイソシアネー
ト、！、１０−デカメチレンジイソシアネート、１．４
−シクロヘキシレンジイソシアネート、キシリレンジイ
ソシアネート、
４．４′−メチレンビス（シクロヘキシルイソシアネー
ト）、
１．５−テトラヒドロナフタレンジイソシアネート、
イソホロンジイソシアネート等
また、本発明で使用してもよい鎖伸長剤は、エチレング
リコール、プロピレングリコール、ジエチレングリコー
ル、１．４−ブタンジオール、１．６−ヘキサンジオー
ル、エチレンジアミン、１．２−プロピレンジアミン、
トリメチレンジアミン、テトラメチレンジアミン、ヘキ
サメチレンジアミン、デカメチレンジアミン、イソホロ
ンジアミン、ｍ−キシリレンジアミン、ヒドラジン、水
等がある。Tolylene diisocyanate, 4-methoxy-1,3-phenylene diisocyanate, 4-isopropyl-1,3-phenylene diisocyanate, 4-chloro-1,3-phenylene diisocyanate, 4-butoxy-1,3-phenylene diisocyanate, 2. 4-diisocyanate diphenyl ether mesitylene diisocyanate, 4.4'-methylenebis(phenylisocyanate), shrylene diisocyanate, 1.5-naphthalene diisocyanate, benzidine diisocyanate, 0-nitrobenzidine diisocyanate, 4.4-dibenzyl diisocyanate, 1.4 -tetramethylene diisocyanate, 1,6-tetramethylene diisocyanate,! , 10-decamethylene diisocyanate, 1.4
-cyclohexylene diisocyanate, xylylene diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), 1,5-tetrahydronaphthalene diisocyanate, isophorone diisocyanate, etc. Chain extenders that may also be used in the present invention include ethylene glycol, propylene Glycol, diethylene glycol, 1.4-butanediol, 1.6-hexanediol, ethylenediamine, 1.2-propylenediamine,
Examples include trimethylene diamine, tetramethylene diamine, hexamethylene diamine, decamethylene diamine, isophorone diamine, m-xylylene diamine, hydrazine, water, and the like.
本発明で使用するカルボキシル基又はその塩を有するポ
リウレタン系樹脂は、以上の如き主要材料から溶剤中又
は無溶剤で、必要に応じて触媒を用いて製造することが
でき、それらの製造条件はいずれも従来公知の方法でよ
い。The polyurethane resin having a carboxyl group or a salt thereof used in the present invention can be produced from the above-mentioned main materials in a solvent or without a solvent, using a catalyst if necessary, and the production conditions may vary. Also, a conventionally known method may be used.
また、本発明においては、上記の如きポリウレタン系樹
脂の製造に際しては従来公知のポリオールを任意の割合
で併用することもできる。Furthermore, in the present invention, conventionally known polyols can be used in combination in arbitrary proportions when producing the above-mentioned polyurethane resin.
このような従来公知のポリオールの好ましいものとして
は、例えば、末端基が水酸基であり、分子量が３００〜
４，０００のポリエチレンアジペート、ポリエチレンプ
ロピレンアジベート、ポリエチレンブチレンアジベート
、ポリジエチレンサクシネート、ポリブチレンサクシネ
ート、ポリエチレンセバケート、ポリブチレンセバケー
ト、ポリテトラメチレンエーテルグリコール、ポリ−６
−カブロラクドンジジオール、ポリへキサメチレンアジ
ペート、カーボネートポリオール、ポリエチレングリコ
ール、ポリプロピレングリコール等がある。Preferred examples of such conventionally known polyols include those whose terminal group is a hydroxyl group and whose molecular weight is 300 to 300.
4,000 polyethylene adipate, polyethylene propylene adipate, polyethylene butylene adipate, polydiethylene succinate, polybutylene succinate, polyethylene sebacate, polybutylene sebacate, polytetramethylene ether glycol, poly-6
- Cabrolacdon didiol, polyhexamethylene adipate, carbonate polyol, polyethylene glycol, polypropylene glycol, etc.
本発明の磁気記録媒体は、そのバックコート層を形成す
る結合剤として、上記の如き特定の結合剤を使用するこ
とを主たる特徴とするものであり、本発明においては、
上記特定の結合剤の使用に際し、従来公知の結合剤を任
意の割合で併用することができる。The magnetic recording medium of the present invention is mainly characterized by using the above-mentioned specific binder as a binder forming the back coat layer.
When using the above-mentioned specific binder, conventionally known binders can be used in combination in any proportion.
これらの結合剤としては、例えば、塩化ビニル系樹脂、
塩化ビニリデン系樹脂、塩化ビニル／酢酸ビニル／ビニ
ルアルコール共重合系樹脂、アルキッド系樹脂、エポキ
シ系樹脂、アクリロニトリル−ブタジェン系樹脂、本発
明で使用する以外のポリウレタン系樹脂、ニトロセルロ
ース系樹脂、ポリブチラール系樹脂、ポリエステル系樹
脂、シリコーン系樹脂、メラミン系樹脂、尿素系樹脂、
アクリル系樹脂、ポリアミド系樹脂等が挙げられ、特に
好ましいものは、ポリウレタン系樹脂である。これらの
樹脂は、いずれも単独でも混合物としても使用できる。Examples of these binders include vinyl chloride resin,
Vinylidene chloride resin, vinyl chloride/vinyl acetate/vinyl alcohol copolymer resin, alkyd resin, epoxy resin, acrylonitrile-butadiene resin, polyurethane resin other than those used in the present invention, nitrocellulose resin, polybutyral resin, polyester resin, silicone resin, melamine resin, urea resin,
Examples include acrylic resins and polyamide resins, with polyurethane resins being particularly preferred. These resins can be used alone or as a mixture.
本発明で上記の如き結合剤を溶解及び分散させる有機溶
媒としては、メチルエチルケトン、メチル−ｎ−プロピ
ルケトン、メチルイソブチルケトン、ジエチルケトン、
ギ酸メチル、ギ酸エチル、ギ酸プロピル、酢酸メチル、
酢酸エチル、酢酸ブチル、アセトン、シクロヘキサン、
テトラヒドロフラン、ジオキサン、メタノール、エタノ
ール、イソプロピルアルコール、ブタノール、イソプロ
ピルアルコール、ブタノール、メチルセロソルブ、ブチ
ルセロソルブ、セロソルブアセテート、ジメチルホルム
アミド、ジメチルスルホキシド、ペンタン、ヘキサン、
シクロヘキサン、ヘプタン、オクタン、ミネラルスピリ
ット石油エーテル、ガソリン、ベンゼン、トルエン、キ
シレン、クロロホルム、四塩化炭素、クロルベンゼン、
パークロルエチレン、トリクロルトレン等及びそれらの
混合物が挙げられる。In the present invention, examples of the organic solvent for dissolving and dispersing the binder as described above include methyl ethyl ketone, methyl-n-propyl ketone, methyl isobutyl ketone, diethyl ketone,
Methyl formate, ethyl formate, propyl formate, methyl acetate,
Ethyl acetate, butyl acetate, acetone, cyclohexane,
Tetrahydrofuran, dioxane, methanol, ethanol, isopropyl alcohol, butanol, isopropyl alcohol, butanol, methyl cellosolve, butyl cellosolve, cellosolve acetate, dimethylformamide, dimethyl sulfoxide, pentane, hexane,
Cyclohexane, heptane, octane, mineral spirit petroleum ether, gasoline, benzene, toluene, xylene, chloroform, carbon tetrachloride, chlorobenzene,
Examples include perchlorethylene, trichlorthrene, etc. and mixtures thereof.
また本発明で使用するバックコート層形成用塗料は、上
記の成分の他にカーボンブラック、グラファイト、二酸
化チタン、シソ力、アルミナ等の粉末、ジアルキルポリ
シロキサン、ジアルコキシポリシロキサン、モノアルキ
ルモノアルコキシポリシロキサン、フェニルポリシロキ
サン、フルオロアルキルポリシロキサン等の潤滑剤、ポ
リエチレン、ポリプロピレン、ポリテトラフルオロエチ
レンなどのプラスチック微粉末を分散させることによっ
て得られる。In addition to the above-mentioned ingredients, the paint for forming the back coat layer used in the present invention also contains powders such as carbon black, graphite, titanium dioxide, perilla, alumina, dialkyl polysiloxane, dialkoxy polysiloxane, monoalkyl monoalkoxy polysiloxane, etc. It can be obtained by dispersing lubricants such as siloxane, phenylpolysiloxane, and fluoroalkylpolysiloxane, and fine plastic powders such as polyethylene, polypropylene, and polytetrafluoroethylene.
このバックコート層用塗料を非磁性支持体の磁性層が設
けられる面と反対側の面に塗布することによりバックコ
ート層が形成される。上記バックコート層を塗布する非
磁性支持体としては、ポリエチレンテレフタレート、ポ
リブチレンテレフタレート、ポリエチレン、ポリプロピ
レン、セルローストリアセテート、ポリカーボネート等
が挙げられる。A back coat layer is formed by applying this back coat layer coating material to the surface of the nonmagnetic support opposite to the surface on which the magnetic layer is provided. Examples of the nonmagnetic support on which the back coat layer is applied include polyethylene terephthalate, polybutylene terephthalate, polyethylene, polypropylene, cellulose triacetate, polycarbonate, and the like.
バックコート層の形成は上記のバックコート層用塗料を
公知の方法で塗工し乾燥することによって形成され、そ
の厚みは特に限定されず、従来技術と同様の厚み、例え
ば０．５〜２０μｍ程度の厚みでよい。The back coat layer is formed by applying the above-mentioned back coat layer paint by a known method and drying it, and its thickness is not particularly limited, and the same thickness as in the prior art, for example, about 0.5 to 20 μm. The thickness is sufficient.
一方、磁性層の形成に使用する分散液は、前記結合剤と
同様な樹脂を結合剤とし、該結合剤、磁性粒子及び媒体
を必須成分とする。On the other hand, the dispersion liquid used to form the magnetic layer uses the same resin as the binder described above as a binder, and has the binder, magnetic particles, and a medium as essential components.
本発明で使用する磁性粒子としては、例えば、鉄、クロ
ム、ニッケル、コバルト或いはこれらの合金又は酸化物
、更にはこれらの変性物、具体的には、例えば、γ−Ｆ
ｅ２Ｏ３、フェライト、マグネタイト、ＣｒＯ２等、コ
バルトドープしたγ−Ｆｅ、０３とＦｅ、、０４とのベ
ルトライド化合物等が挙げられる。The magnetic particles used in the present invention include, for example, iron, chromium, nickel, cobalt, alloys or oxides thereof, and modified products thereof, specifically, for example, γ-F.
Examples include e2O3, ferrite, magnetite, CrO2, cobalt-doped γ-Fe, and bertolide compounds of 03 and Fe, 04.
以上の如き磁性粒子は、単なる例示であって、上記例示
以外の各種の磁性粒子も本発明において当然同様に使用
でき、且つ単独でも混合物としても使用できる。The above-mentioned magnetic particles are merely examples, and various magnetic particles other than the above-mentioned examples can of course be similarly used in the present invention, and can be used alone or as a mixture.
本発明で磁性層の形成に使用する分散液は、以上の成分
を必須成分とし、それらの使用割合は、従来の磁性粒子
の分散液におけると同様であり、例えば、分散液全体を
１００重量部とすれば、その中で占る磁性粒子は、約１
０〜５０重量％で、媒体は約５０〜９０重量％で、結合
剤は、約５〜２０重量％の範囲が一般的である。The dispersion used to form the magnetic layer in the present invention has the above-mentioned components as essential components, and the proportions of these components are the same as in conventional dispersions of magnetic particles. For example, the total dispersion is 100 parts by weight. Then, the number of magnetic particles in it is about 1
Typically, the range is 0-50% by weight, with the medium being about 50-90% and the binder being about 5-20%.
以上の如き必須成分及び任意成分からなる本発明で使用
する分散液の製造自体は、従来公知のいずれの方法でも
よく、一般的には、必要成分を同時に或いは順次加えな
がら、ボールミル処理、ミキサー処理、ロールミル処理
、ビーズミル処理、グラベルミル処理、サンドミル処理
、高速インペラー処理等の混合分散方法が好適である。The dispersion liquid used in the present invention, which consists of the above-mentioned essential components and optional components, may be produced by any conventionally known method, and generally, the necessary components are added simultaneously or sequentially, and ball milling or mixer processing is performed. Mixing and dispersing methods such as , roll milling, bead milling, gravel milling, sand milling, and high-speed impeller processing are suitable.
このような分散方法自体は、分散させるべき磁性粒子の
種類、サイズ、その用途等によって、条件が異なるが、
一般的には常温〜１００℃の温度で、５分間〜２０時間
程度処理すればよい。The conditions for such dispersion methods themselves vary depending on the type and size of the magnetic particles to be dispersed, their purpose, etc.
Generally, the treatment may be carried out at a temperature of room temperature to 100° C. for about 5 minutes to 20 hours.
磁性層の形成は、前記の如き分散液を上記の如き支持体
の少なくとも一方の面に、その乾燥時の厚さが好ましく
は約５〜２０μｍになる任意の方法で塗布し、次いで乾
燥させることによって形成できる。塗布方法及び乾燥方
法は、いずれも従来公知の方法でよい。The magnetic layer is formed by applying the dispersion as described above to at least one surface of the support as described above by any method such that the thickness when dried is preferably about 5 to 20 μm, and then drying. It can be formed by The coating method and drying method may be any conventionally known method.
（作用・効果）
以上の如くして得られた本発明の磁気記録媒体は、その
バックコート層形成のための結合剤として特定のポリウ
レタン系樹脂を用いているため、カーボンブラックや他
の充填剤の分散が極めて良好であり、走行性や耐久性に
非常の優れ、ガイド部材等に対する摩耗の少ないもので
ある。更に前記バックコート層の表面粗度が適度に抑え
られているのでＳＮ比の劣化やドロップアウトの増加が
なく、粉落ち、巻き乱れ等が生じないものである。(Function/Effect) Since the magnetic recording medium of the present invention obtained as described above uses a specific polyurethane resin as a binder for forming the back coat layer, carbon black and other fillers may be used. It has extremely good dispersion, excellent runnability and durability, and little wear on guide members and the like. Furthermore, since the surface roughness of the back coat layer is appropriately suppressed, there is no deterioration of the S/N ratio, no increase in dropouts, and no occurrence of powder falling or irregular winding.
以下、本発明を実施例により具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to Examples.
参考例１
［カルボキシル基変性ポリウレタン系樹脂（Ｉ）の調製
］
窒素導入管、温度計、撹拌機及び蒸留管を備えた２リツ
トルのフラスコ中に、グリセリンのプロピレンオキサイ
ド付加物（分子量約１．５００）ｊ、０００部、無水コ
ハク酸６６．７部及びトルエン５３部を導入し、１，５
時間で１５０〜１６０℃に昇温し、更に１５０〜１６０
℃の温度で１．５時間反応させた。その後容器内を５〜
１０ｍｍＨｇに減圧して溶剤及び未反応物を除去し、カ
ルボキシル基変性ポリプロピレンジオールを得た。この
ものの水酸基価は６９であり、酸価は３５であった。Reference Example 1 [Preparation of carboxyl group-modified polyurethane resin (I)] In a 2-liter flask equipped with a nitrogen introduction tube, a thermometer, a stirrer, and a distillation tube, a propylene oxide adduct of glycerin (molecular weight about 1.500 ) j, 000 parts, 66.7 parts of succinic anhydride and 53 parts of toluene were introduced, and 1,5
The temperature is raised to 150-160℃ in an hour, and then further heated to 150-160℃.
The reaction was carried out for 1.5 hours at a temperature of .degree. Afterwards, clean the inside of the container for 5~
The solvent and unreacted substances were removed by reducing the pressure to 10 mmHg to obtain a carboxyl group-modified polypropylene diol. This product had a hydroxyl value of 69 and an acid value of 35.
上記のジオール２５０部、ポリカーボネートポリオール
７５０部、１．４−ブタンジオール１００部、トリレン
ジイソシアネート２８５部、ジメチルホルムアミド１，
２８６部及びテトラヒドロフラン１，２８６部を混合し
、約８０〜１２０℃で８時間反応させて、本発明で使用
するカルボキシル基変性ポリウレタン系樹脂（Ｉ）を得
た。このポリウレタン系樹脂は分子量が約７０．０００
であった。250 parts of the above diol, 750 parts of polycarbonate polyol, 100 parts of 1,4-butanediol, 285 parts of tolylene diisocyanate, 1 dimethylformamide,
286 parts and 1,286 parts of tetrahydrofuran were mixed and reacted at about 80 to 120°C for 8 hours to obtain carboxyl group-modified polyurethane resin (I) used in the present invention. This polyurethane resin has a molecular weight of approximately 70.000.
Met.
参考例２〜３
参考例１における各反応資材に代えて下記の反応資材を
用い、他は参考例１と同様にして本発明で使用するカル
ボキシル基変性ポリウレタン系樹脂（ＩＩ）及び（ＩＩ
Ｉ）を調製した。Reference Examples 2 to 3 Carboxyl group-modified polyurethane resins (II) and (II) used in the present invention were prepared in the same manner as in Reference Example 1 except that the following reaction materials were used in place of each of the reaction materials in Reference Example 1.
I) was prepared.
トリメチロールプロパンのプロピレンオキサイド付加物
と無水フタル酸との反応生成物（分子量約２，０００、
水酸基価５２、酸価２６）％１ し ン・ ■ の
−′告 ′１は′上記のポリオール
６００００部ポリブチレンアジベルト ４００部
トリレンジイソシアネート １８０部１．４−
ブタンジオール ５０部（分子量約７０，
０００）
グリセリンのプロピレンオキサイド付加物と無水トリメ
リット酸との反応生成物（分子量約７００、水酸基価１
２５、酸価６３）
ポリ レタン、二ＬＵ の 浩 ″ は′上記のポ
リオール ５００部ポリプロピレング
リコール ５００部４．４′−ジフェニルメタ
ンジイソシアネート４７６部
１．６−ヘキサンジオール １００部（分子量
約７０，０００）
実施例１
Ｃｏ−ｙ−Ｆｅ２０． １００重量部塩化ビニ
ル−酢酸ビニル共重合体 １５重量部（Ｕ、Ｃ，Ｃ，社
ＶＡＧＨ）
ポリウレタン樹脂 ２９重量部（大日精
化製ダイフェラミンＭＡＬＩ −９０２０’）不揮発分
３５％
レシチン ２重量部パルミチ
ン酸 １重量部Ｃｒ２Ｏ，、２重
量部
メチルエチルケトン １６２重量部ドルオー
ル ８２重量部シクロへキサノン
４０重量部上記組成物をボールミルに
仕込み、４８時間分散混合し、更に硬化剤（商品名；デ
スモジュールし、バイエル社製品）を４重量部加えて、
３０分間混合する。Reaction product of propylene oxide adduct of trimethylolpropane and phthalic anhydride (molecular weight approximately 2,000,
Hydroxyl value: 52, acid value: 26)%1
60,000 parts polybutylene aziberto 400 parts tolylene diisocyanate 180 parts 1.4-
Butanediol 50 parts (molecular weight approximately 70,
000) Reaction product of propylene oxide adduct of glycerin and trimellitic anhydride (molecular weight approximately 700, hydroxyl value 1
25, acid value 63) Polyurethane, 2LU's 500 parts of the above polyol 500 parts of polypropylene glycol 476 parts of 4.4'-diphenylmethane diisocyanate 100 parts of 1.6-hexanediol (molecular weight approximately 70,000) Example 1 Co-y-Fe20. 100 parts by weight Vinyl chloride-vinyl acetate copolymer 15 parts by weight (U, C, C, company VAGH) Polyurethane resin 29 parts by weight (Daiferamin MALI-9020' manufactured by Dainichiseika Chemical Co., Ltd.) Nonvolatile content 35% Lecithin 2 parts by weight Palmitic acid 1 part by weight Cr2O, 2 parts by weight Methyl ethyl ketone 162 parts by weight Doluol 82 parts by weight Cyclohexanone 40 parts by weight The above composition was placed in a ball mill, dispersed and mixed for 48 hours, and then added with a curing agent ( Add 4 parts by weight of product name: Desmodur, a Bayer product,
Mix for 30 minutes.
これを１μｍのフィルターで濾過し、磁性塗料を調製し
た。これを１６μｍ厚のポリエチレンテレフタレートフ
ィルム上に乾燥後の厚みが６μｍとなるように塗布して
磁性層を形成し、磁場配向処理を行なった後乾燥して巻
き取った。これをカレンダー処理した後、
二酸化チタン ５０重量部ブラック
パールＬ（キャボット社）５０重量部塩化ビニル−酢酸
ビニル共重合体 ５０重量部（Ｕ、Ｃ，Ｃ，社ＶＡＧＨ
）
カルボキシル基変性ポリウレタン系樹脂（Ｉ）１４３重
量部
メチルエチルケトン ２２７重量部ドルオー
ル ２００重量部シクロへキサノン
８重量部からなる組成物をボールミ
ルで４８時間混合し、１μｍのフィルターで濾過した後
、硬化剤（商品名：デスモジュールＬ）１３．３重量部
添加し、更に３０分間混合し、バックコート塗料を調製
した。このバックコート塗料を上記のポリエチレンテレ
フタレートフィルムの磁性層が設けられた面の裏面に乾
燥後の塗布厚が１μｍとなるように塗布してバックコー
ト層を形成した。これを熱処理した後１／２インチ１１
にスリットして本発明の磁性テープを作成した。This was filtered through a 1 μm filter to prepare a magnetic paint. This was coated onto a polyethylene terephthalate film having a thickness of 16 μm so that the thickness after drying would be 6 μm to form a magnetic layer, subjected to magnetic field orientation treatment, dried and wound up. After calendering, 50 parts by weight of titanium dioxide 50 parts by weight of Black Pearl L (Cabot) 50 parts by weight of vinyl chloride-vinyl acetate copolymer (VAGH
) Carboxyl group-modified polyurethane resin (I) 143 parts by weight Methyl ethyl ketone 227 parts by weight Doluol 200 parts by weight Cyclohexanone 8 parts by weight A composition was mixed in a ball mill for 48 hours, filtered through a 1 μm filter, and then mixed with a curing agent. (Product name: Desmodur L) was added in an amount of 13.3 parts by weight, and the mixture was further mixed for 30 minutes to prepare a back coat paint. This back coat paint was applied to the back side of the above-mentioned polyethylene terephthalate film on which the magnetic layer was provided so that the coating thickness after drying was 1 μm to form a back coat layer. After heat treating this, 1/2 inch 11
A magnetic tape of the present invention was prepared by slitting the tape.
実施例２
硫酸バリウム（平均粒度０，０７μｍ、モース硬度３）
５０重量部ブラックバ
ールＬ（キャボット社）５０重量部塩化ビニル−酢酸ビ
ニル共重合体 ５０重量部（Ｕ、Ｃ，Ｃ，社ＶＡＧＨ）
カルボキシル基変性ポリウレタン系樹脂（■）１４３重
量部
メチルエチルケトン ２２７重量部ドルオー
ル ２００重量部シクロへキサノン
８重量部上記組成物及び硬化剤（デ
ィスモジュールしバイエル社）１３．３重量部を用いて
バックコート塗料を調製し、実施例１と同様な方法によ
って、磁気層及びバックコート層を形成して本発明の磁
気テープを作成した。Example 2 Barium sulfate (average particle size 0.07 μm, Mohs hardness 3)
50 parts by weight Black Bar L (Cabot) 50 parts by weight Vinyl chloride-vinyl acetate copolymer 50 parts by weight (U, C, C, VAGH) Carboxyl group-modified polyurethane resin (■) 143 parts by weight Methyl ethyl ketone 227 parts by weight A back coat paint was prepared using 200 parts by weight of Dorol and 8 parts by weight of cyclohexanone. A magnetic tape of the present invention was prepared by forming a back coat layer.
実施例３
硫酸バリウム（平均粒度０．０７μｍ、モース硬度３）
５０重量部ブラックバ
ールＬ（キャボット社）５０重量部塩化ビニル−酢酸ビ
ニル共重合体 ５０重量部（υ、Ｃ，Ｃ，社ＶＡＧ）ｌ
）
カルボキシル基変性ポリウレタン系樹脂（ＩＩＩ）１４
３重量部
メチルエチルケトン ２２７重量部トリオー
ル ２００重量部シクロへキサノ
ン ８重量部上記組成物及び硬化剤（
ディスモジュール上バイエル社）１３．３重量部を用い
てバックコート塗料を調製し、実施例１と同様な方法に
よって、磁気層及びバックコート層を形成して本発明の
磁気テープを作成した。Example 3 Barium sulfate (average particle size 0.07 μm, Mohs hardness 3)
50 parts by weight Black Bar L (Cabot) 50 parts by weight Vinyl chloride-vinyl acetate copolymer 50 parts by weight (υ, C, C, Company VAG) l
) Carboxyl group-modified polyurethane resin (III) 14
3 parts by weight Methyl ethyl ketone 227 parts by weight Triol 200 parts by weight Cyclohexanone 8 parts by weight The above composition and curing agent (
A back coat paint was prepared using 13.3 parts by weight of Dismodule (Bayer AG), and a magnetic layer and a back coat layer were formed in the same manner as in Example 1 to produce a magnetic tape of the present invention.
比較例
二酸価チタン ５０重量部ブラック
バールＬ（キャポット社）５０ｆｆｌｉ部塩化ビニルー
酢酸ビニル共重合体 ５０重量部（Ｕ、Ｃ，Ｃ，社Ｖへ
Ｇ１１）
ポリウレタン樹脂（ニステン＃５７０１＞１４３重量部
メチルエチルケトン ２２７ｆｉｉ部ドルオ
ール ２００重量部シクロへキサノ
ン ８重量部上記組成物及び硬化剤（
ディスモジュール上バイエル社）１３．３重量部を用い
てバックコート塗料を調製し、実施例１と同様な方法に
よって、磁気層及びバックコート層を形成して比較例の
磁気テープを作成した。Comparative Example Titanium dioxide 50 parts by weight Black Bar L (Capot Co.) 50 parts by weight Vinyl chloride-vinyl acetate copolymer 50 parts by weight (U, C, C, Company V G11) Polyurethane resin (Nisten #5701>143 parts by weight Methyl ethyl ketone 227 parts Doluol 200 parts Cyclohexanone 8 parts by weight The above composition and curing agent (
A back coat paint was prepared using 13.3 parts by weight of Dismodule (Bayer AG), and a magnetic layer and a back coat layer were formed in the same manner as in Example 1 to produce a magnetic tape of a comparative example.
実施例及び比較例で得た磁気テープの物性を測定した結
果を第１表に示す。Table 1 shows the results of measuring the physical properties of the magnetic tapes obtained in Examples and Comparative Examples.
ｋＩ」−ｊ（kI”-j(
Claims (1)
ックコート層を設けてなる磁気記録媒体において、上記
バックコート層の結合剤が、エステル結合を介して主鎖
に結合したカルボキシル基を有するポリウレタン系樹脂
を含有することを特徴とする磁気記録媒体。In a magnetic recording medium in which a magnetic layer is provided on one side of a non-magnetic support and a back coat layer is provided on the other side, the binder of the back coat layer is a carboxyl group bonded to the main chain via an ester bond. A magnetic recording medium characterized by containing a polyurethane resin having a group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP181887A JPS63171417A (en) | 1987-01-09 | 1987-01-09 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP181887A JPS63171417A (en) | 1987-01-09 | 1987-01-09 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63171417A true JPS63171417A (en) | 1988-07-15 |
| JPH0474775B2 JPH0474775B2 (en) | 1992-11-27 |
Family
ID=11512144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP181887A Granted JPS63171417A (en) | 1987-01-09 | 1987-01-09 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63171417A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH027222A (en) * | 1988-06-27 | 1990-01-11 | Hitachi Maxell Ltd | Magnetic recording medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5930235A (en) * | 1982-08-10 | 1984-02-17 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS6029928A (en) * | 1983-07-29 | 1985-02-15 | Mitsubishi Chem Ind Ltd | Magnetic recording medium |
| JPS6159623A (en) * | 1984-08-29 | 1986-03-27 | Hitachi Maxell Ltd | Magnetic recording medium |
-
1987
- 1987-01-09 JP JP181887A patent/JPS63171417A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5930235A (en) * | 1982-08-10 | 1984-02-17 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS6029928A (en) * | 1983-07-29 | 1985-02-15 | Mitsubishi Chem Ind Ltd | Magnetic recording medium |
| JPS6159623A (en) * | 1984-08-29 | 1986-03-27 | Hitachi Maxell Ltd | Magnetic recording medium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH027222A (en) * | 1988-06-27 | 1990-01-11 | Hitachi Maxell Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0474775B2 (en) | 1992-11-27 |
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|---|---|---|---|
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