JPH0458650B2 - - Google Patents
Info
- Publication number
- JPH0458650B2 JPH0458650B2 JP57170078A JP17007882A JPH0458650B2 JP H0458650 B2 JPH0458650 B2 JP H0458650B2 JP 57170078 A JP57170078 A JP 57170078A JP 17007882 A JP17007882 A JP 17007882A JP H0458650 B2 JPH0458650 B2 JP H0458650B2
- Authority
- JP
- Japan
- Prior art keywords
- parts
- acrylate
- magnetic
- weight
- meth
- 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 33
- -1 methacryloyl groups Chemical group 0.000 claims description 26
- 239000011230 binding agent Substances 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 13
- 238000010894 electron beam technology Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 claims description 8
- 229920005992 thermoplastic resin Polymers 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000011342 resin composition Substances 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- LEJBBGNFPAFPKQ-UHFFFAOYSA-N 2-(2-prop-2-enoyloxyethoxy)ethyl prop-2-enoate Chemical compound C=CC(=O)OCCOCCOC(=O)C=C LEJBBGNFPAFPKQ-UHFFFAOYSA-N 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 8
- 230000005294 ferromagnetic effect Effects 0.000 description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 239000000020 Nitrocellulose Substances 0.000 description 6
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 229920001220 nitrocellulos Polymers 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 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
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 description 3
- 231100000987 absorbed dose Toxicity 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 229910020630 Co Ni Inorganic materials 0.000 description 2
- 229910002440 Co–Ni Inorganic materials 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 2
- 239000011354 acetal resin Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 239000012461 cellulose resin Substances 0.000 description 2
- 229940090961 chromium dioxide Drugs 0.000 description 2
- IAQWMWUKBQPOIY-UHFFFAOYSA-N chromium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Cr+4] IAQWMWUKBQPOIY-UHFFFAOYSA-N 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium(IV) oxide Inorganic materials O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920005906 polyester polyol Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- OCJBOOLMMGQPQU-UHFFFAOYSA-N 1,4-dichlorobenzene Chemical compound ClC1=CC=C(Cl)C=C1 OCJBOOLMMGQPQU-UHFFFAOYSA-N 0.000 description 1
- 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
- SZIFAVKTNFCBPC-UHFFFAOYSA-N 2-chloroethanol Chemical compound OCCCl SZIFAVKTNFCBPC-UHFFFAOYSA-N 0.000 description 1
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 1
- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 description 1
- UOBYKYZJUGYBDK-UHFFFAOYSA-N 2-naphthoic acid Chemical compound C1=CC=CC2=CC(C(=O)O)=CC=C21 UOBYKYZJUGYBDK-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 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
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-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
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- GPFIZJURHXINSQ-UHFFFAOYSA-N acetic acid;nitric acid Chemical compound CC(O)=O.O[N+]([O-])=O GPFIZJURHXINSQ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 229910001566 austenite Inorganic materials 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
- VRXAQKMPZKGHIH-UHFFFAOYSA-N butan-2-one butyl octadecanoate Chemical compound C(C)C(=O)C.C(CCCCCCCCCCCCCCCCC)(=O)OCCCC VRXAQKMPZKGHIH-UHFFFAOYSA-N 0.000 description 1
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 1
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- DHZSIQDUYCWNSB-UHFFFAOYSA-N chloroethene;1,1-dichloroethene Chemical compound ClC=C.ClC(Cl)=C DHZSIQDUYCWNSB-UHFFFAOYSA-N 0.000 description 1
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- PDXRQENMIVHKPI-UHFFFAOYSA-N cyclohexane-1,1-diol Chemical compound OC1(O)CCCCC1 PDXRQENMIVHKPI-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229940117389 dichlorobenzene Drugs 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001227 electron beam curing Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229940116333 ethyl lactate Drugs 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 235000013305 food Nutrition 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
- IIRDTKBZINWQAW-UHFFFAOYSA-N hexaethylene glycol Chemical compound OCCOCCOCCOCCOCCOCCO IIRDTKBZINWQAW-UHFFFAOYSA-N 0.000 description 1
- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 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
- 150000002739 metals Chemical class 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- UWJJYHHHVWZFEP-UHFFFAOYSA-N pentane-1,1-diol Chemical compound CCCCC(O)O UWJJYHHHVWZFEP-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- ULWHHBHJGPPBCO-UHFFFAOYSA-N propane-1,1-diol Chemical compound CCC(O)O ULWHHBHJGPPBCO-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 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 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 229940113165 trimethylolpropane Drugs 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
- G11B5/7026—Radiation curable polymers
-
- 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
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
- G11B5/7021—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing a polyurethane or a polyisocyanate
- G11B5/7022—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing a polyurethane or a polyisocyanate containing mixtures of polyurethanes or polyisocyanates with other polymers
-
- 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
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/702—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent
- G11B5/7023—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the bonding agent containing polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】
本発明はビデオテープ、オーデイオテープ、コ
ンピユーターテープ等の磁気記録媒体に関するも
のである。
現在、一般に広く使用されている磁気記録媒体
には、塩化ビニル−酢酸ビニル系樹脂、塩化ビニ
ル−塩化ビニリデン系樹脂、セルロース樹脂、ア
セタール樹脂、ウレタン樹脂、アクリロニトリル
ブタジエン樹脂等の熱可塑性樹脂を単独あるいは
混合して結合剤として用いているが、この方法で
は、磁性層の耐摩耗性が劣り磁気テープの走行経
路を汚してしまうという欠点を有していた。
またメラミン樹脂、尿素樹脂などの熱硬化性樹
脂を用いる方法あるいは上記熱可塑性樹脂に化学
反応による架橋性の結合剤、例えばイソシアネー
ト化合物、エポキシ化合物などを添加することも
知られている。しかし、架橋性の結合剤を用いる
と、磁性体を分散させた樹脂溶液の貯蔵安定性が
悪い(即ち、ポツトライフが短かいという欠点を
有し磁性塗液物性の均一性、ひいては、磁気テー
プの均質性が保てないという欠点)、及び塗布乾
燥後に塗膜の硬化のために熱処理工程が必要であ
り、製品化までに長時間を要するという大きな欠
点を有していた。
これらの欠点を防止するため、アクリル酸エス
テル系のオリゴマーとモノマーを結合剤として用
い、乾燥後に電子線照射によつて硬化せしめる磁
気材料の製造方法が提案されている(特公昭47−
12423号、特開昭47−13639号、特開昭47−15104
号、特開昭50−77433号、特開昭56−25231号等)。
しかしながら、上記特許に開示された製造方法で
は高度な力学的性質、電気特性を有する磁気記録
媒体は得られなかつた。また、磁気テープの長時
間記録化のために支持体を薄くすることが要求さ
れ、磁性層の力学的性質の向上が要求されてい
る。更にまた、例えばビデオテープの場合はビデ
オカセツトレコーダーの多機能化によつて磁気テ
ープは可酷な使用条件が要求されているが、これ
らの要求を満足する力学的性質を磁性層に付与す
ることはできなかつた。特に、特開昭56−25231
号に開示された熱可塑性樹脂とアクリル系化合物
を混合して用いたときアクリル系化合物が多いと
スチル耐久性が十分に得られず、また一方熱可塑
性樹脂が多いと磁性層が剥落しやすく、レコーダ
ー類の機器のテープ走行経路を汚したりヘツドが
汚れたりした。これは電子線による重合が不十分
なためと考えられる。
本発明者等は熱可塑性樹脂、熱硬化樹脂を用い
る方法、及び化学反応による架橋性の結合剤を添
加する方法、更に電子線架橋による硬化性結合剤
を用いる方法、等の従来技術の欠点を改良するた
め鋭意研究を重ねた結果本発明に到達したもので
ある。
本発明の目的は、第1に、繰り返し走行させて
も電磁変換特性の優れた磁気記録媒体を提供する
ことにあり、第2に、力学的性質の優れた磁性層
を有する磁気記録媒体を提供することにあり、第
3図に、磁性塗液の貯蔵安定性が良好で均質な磁
気記録媒体を提供することにあり、第4に、耐摩
耗性の優れた磁気記録媒体を提供することにあ
り、第5に、塗膜の硬化のための熱処理工程が不
要な磁気記録媒体を提供することにある。
本発明の上記の目的は、分子量が1000以上でア
クリロイル基もしくはメタクリロイル基を分子中
に2個以上含む化合物 60〜90重量部と、分子量
が600以下でアクリロイル基もしくはメタクリロ
イル基を分子中に2個以上含む化合物 40〜10重
量部から成る混合物100重量部に対して熱可塑性
樹脂を30〜300重量部含む脂肪組成物を結合剤と
して含有し、これに電子線照射してなる磁気記録
媒体によつて達成される。
即ち、本発明の特徴とするところは、電子線に
よつて重合が可能なアクリロイル基もしくはメタ
クリロイル基を分子中に2個以上含む分子量1000
以上のオリゴマーと分子量600以下の多官能アク
リレートモノマーを併用し可塑性樹脂とを混合し
て結合剤として用いることによつて、繰り返し使
用による耐久性を向上させ、磁気テープ走行経路
の汚れ、ヘツド汚れの問題点を解決したことであ
る。
本発明における熱可塑性樹脂としては、塩ビ−
酢ビ共重合体、塩ビ−プロピオン酸ビニル共重合
体、塩ビ−酢ビ−ビニルアルコール共重合体、塩
ビ−酢ビ−マレイン酸共重合体、塩ビ−プロピオ
ン酸ビニル−ビニルアルコール共重合体等の塩酢
ビ系共重合体、セルロースアセテート、セルロー
スジアセテート、セルローストリアセテート、セ
ルロースアセテートブチレート、セルロースアセ
テートナイトレート、セルロースナイトレート等
の繊維素系樹脂、ポリカーボネート樹脂、ポリア
ミド樹脂、エポキシ樹脂、アセタール系樹脂、ウ
レタン樹脂、アクリロニトリル−ブタジエン共重
合体、エチレン−酢ビ共重合体などであり、これ
らは混合して用いてもよい。
分子量が1000以上でアクリロイル基もしくはメ
タクリロイル基を分子中に2個以上含む化合物
(アクリレート系オリゴマー)としては、高分子
鎖の主鎖の末端あるいは側鎖にアクリロイル基、
あるいはメタクリロイル基を有する化合物であ
り、これらはA.Vrancken“Fatipec Congress”
11 19(1972)に引用されている。例えば以下に
示す化合物
であり、例示した化合物のポリエステル骨格がエ
ポキシ樹脂の骨格、ポリエーテル骨格、ポリカボ
ネート骨格であつてもあるいはこれらの混合され
た骨格でもよい。分子量としては1000〜2000が好
ましいが、特に限定されるものではない。
分子量が600以下でアクリロイル基もしくはメ
タクリロイル基を分子中に2個以上含む化合物
(アクリレート系モノマー)としては、エチレン
グリコールジ(メタ)アクリレート、ジエチレン
グリコールジ(メタ)アクリレート、トリエチレ
ングリコールジ(メタ)アクリレート、テトラエ
チレングリコールジ(メタ)アクリレート、ヘキ
サエチレングリコールジ(メタ)アクリレート、
プロパンジオールジ(メタ)アクリレート、ブタ
ンジオールジ(メタ)アクリレート、ペンタンジ
オールジ(メタ)アクリレート、ネオペンチルグ
リコールジ(メタ)アクリレート、ヘキサンジオ
ールジ(メタ)アクリレート、シクロヘキサンジ
オールジ(メタ)アクリレート、トリメチロール
プロパントリ(メタ)アクリレート、ペンタエリ
スリトールトリ(メタ)アクリレート、ペンタエ
リスリトールテトラ(メタ)アクリレート、及び
その他のポリオールのポリ(メタ)アクリレート
で分子量が600以下のものである。
アクリレート系オリゴマーとアクリレート系モ
ノマーの好ましい重量比は、60〜90/40〜10であ
り、この混合物と熱可塑性ポリマーの比は、
100/30〜300が好ましい。特に好ましい範囲とし
てはアクリレート系オリゴマーとモノマーの比
は、70〜85/30〜15であり、アクリレート系化合
物の混合物と熱可塑性ポリマーの比は、100/50
〜200である。この範囲を外れてモノマーの量が
少なくなつても多くなつても、また熱可塑性ポリ
マーアクリレート系オリゴマーの量が多くなつて
も、電子線による重合率が低くなつて好ましくな
い。重合のために多大な電子線量を必要とし、は
なはだしい場合にはテープの走行経路を汚してし
まうことになる。一方、熱可塑性ポリマー、アク
リレート系オリゴマーの量が少なくなるとスチル
耐久性が悪くなつたり磁性層が剥落してしまうと
いう問題を生じた。
更にまた、本発明の組成物は、炭素−炭素不飽
和結合を分子中に1個有し電子線による重合が可
能な化合物を混合してもよい。
本発明に用いられる強磁性粉末としては、強磁
性酸化鉄微粉末、Coドープの強磁性酸化鉄微粉
末、強磁性二酸化クロム微粉末、強磁性合金粉末
バリウムフエライトなどが使用できる。強磁性酸
化鉄、二酸化クロムの針状比は、2/1〜20/1
程度、好ましくは5/1以上平均長は0.2〜2.0μ
m程度の範囲が有効である。強磁性合金粉末は金
属分が75w′t%以上であり、金属分の80wt%以上
が強磁性金属(即ち、Fe,Co,Ni,Fe−Co,
Fe−Ni,Co−Ni,Fe−Co−Ni)で長径が約
1.0μm以下の粒子である。
有機溶剤としては、アセトン、メチルエチルケ
トン、メチルイソブチルケトン、シクロヘキサノ
ン等のケトン系;酢酸メチル、酢酸エチル、酢酸
ブチル、乳酸エチル、酢酸グリコールモノエチル
エーテル等のエステル系;エーテル、グリコール
ジメチルエーテル、グリコールモノエチルエーテ
ル、ジオキサン等のグリコールエーテル系;ベン
ゼン、トルエン、キシレン等の芳香族炭化水素;
メチレンクロライド、エチレンクロライド、四塩
化炭素、クロロホルム、エチレンクロルヒドリ
ン、ジクロルベンゼン等の塩素化炭化水素等のも
のが選択して使用できる。
また、本発明の磁性塗液には、潤滑剤、研魔
剤、分散剤、防錆剤、帯電防止剤などの添加剤を
加えてもよい。特に潤滑剤は、飽和及び不飽和の
高級脂肪酸、脂肪酸エステル、高級脂肪酸アミ
ド、高級アルコール、シリコンオイル、鉱油、食
物油、フツソ系化合物などがあり、これらは塗布
液調製時に添加してもよく、また乾燥後あるいは
平滑化処理後あるいは電子線硬化後に有機溶剤に
溶解してあるいはそのまま磁性層表面に塗布ある
いは、噴霧してもよい。
磁性塗液を塗布する支持体の素材としては、ポ
リエチレンテレフタレート、ポリエチレン−2,
6−ナフタレート等のポリエステル類;ポリエチ
レン、ポリプロピレン等のポリオレフイン類、セ
ルローストリアセテート等のセルロース誘導体、
ポリカーボネート、ポリイミド、ポリアミドイミ
ド等プラスチツクの他に用途に応じてアルミニウ
ム、銅、スズ、亜鉛またはこれらを含む非磁性合
金などの非磁性金属類;紙、ポリオレフイン類を
塗布またはラミネートした紙などの紙類も使用で
きる。
又、非磁性支持体の形態はフイルム、テープ、
シート、デイスク、カード、ドラム等いずれでも
良く、形態に応じて種々の材料が必要に応じて選
択される。
又、本発明の支持体は帯電防止、転写防止、ワ
ウフラツターの防止、磁気記録体の強度向上、バ
ツク面のマツト化等の目的で、磁性層を設けた側
の反対の面(バツク面)がいわゆるバツクコート
されていてもよい。
本発明に使用される組成、方法等については特
公昭52−108804号に記載されている。
電子線加速器としてはスキヤニング方式、ダブ
ルスキヤニング方式あるいはカーテンビーム方
式、ブロードビームカーテン方式が採用できる。
電子線特性としては、加速電圧が100〜1000kV、
好ましくは150〜300kVであり、吸収線量として
0.5〜20メガラツド好ましくは3〜15メガラツド
である。加速電圧が100kV以下の場合は、エネル
ギーの透過量が不足し1000kVを超えると重合に
使かれるエネルギー効率が低下し経済的でない。
吸収線量として、0.5メガラツド以下では硬化反
応が不充分で磁性層強度が得られず、20メガラツ
ド以上になると、硬化に使用されるエネルギー効
率が低下したり、被照射体が発熱し、特にプラス
テイツク支持体が変形するので好ましくない。
以下に本発明を実施例および比較例により更に
具体的に説明する。以下の実施例および比較例に
おいて「部」はすべて「重量部」を示す。
実施例 1
γ−Fe2O3 400部
ニトロセルロース(ダイセル社製RS1/2H)
60部
エステルアクリレートオリゴマー(東亜合成製
「アロニクスM6100」) 33部
ジエチレングリコールジアクリレート 7部
レシチン 4部
ステアリン酸 4部
ブチルステアレートメチルエチルケトン 1000部
上記成分をボールミルで50時間混練して得られ
た磁性塗液を15μのポリエチレンテレフタレート
支持体上に、ドクターブレードを用いて乾燥膜厚
が5μになるように塗布しコバルト磁石を用いて
配向させたのち、溶剤を乾燥(100℃/分間)さ
せた。このあとでコツトンロールと鏡面ロールの
群からなる5段のカレンダーで平滑化処理(ロー
ル温度60℃、圧力100Kg/cm2)を行つた。
次いで加速電圧200kV、ビーム電流10mAで
10Mradの吸収線量になるように照射した。この
サンプルをNo.1とする。
実施例 2
実施例1の結合剤を下記のように変えて実施例
1と同様に処理してサンプルNo.2を得た。(但し
カレンダーのロール温度は30℃)
ウレタン樹脂(アジピン酸、ブタンジオール、
トリレンジイソシアネート縮合物) 30部
エポキシアクリレートオリゴマー(昭和高分子
製「リポキシsp1507」) 45部
トリメチロールプロパントリアクリレート15部
実施例1の結合剤を下記のように変えて、実施
例1と同様に処理した。
比較例1(サンプルNo.3)
ニトロセルロース(RS1/2H) 80部
エステルアクリレートオリゴマー(「アロニク
スM6100」) 15部
ジエチレングリコールジアクリレート 5部
比較例2(サンプルNo.4)
ニトロセルロース(RS1/2H) 20部
エステルアクリレートオリゴマー(「アロニク
スM6100」) 65部
ジエチレングリコールジアクリレート 15部
比較例3(サンプルNo.5)
ニトロセルロース(RS1/2H) 60部
エステルアクリレートオリゴマー(「アロニク
スM6100」) 37部
ジエチレングリコールジアクリレート 3部
比較例4(サンプルNo.6)
ニトロセルロース(RS1/2H) 60部
エステルアクリレートオリゴマー(「アロニク
スM6100」) 20部
ジエチルグリコールジアクリレート 20部
比較例 5
実施例1の結合剤を下記のように変えて実施例
1と同様に処理してサンプル7を得た(但しカレ
ンダーロール温度は30℃)
ウレタン樹脂(実施例2と同じ) 80部
エポキシアクリレートオリゴマー(リポキシ
sp1507 」) 15部
トリメチロールプロパントリアクリレート5部
実施例 3
実施例1の結合剤を下記のように変えて実施例
1と同様に処理してサンプルNo.8を得た。
塩ビ酢ビビニルアルコール共重合体(塩ビ86、
酢ビ10、ビニルアルコール4) 50部
エステルアクリレートオリゴマー(「アロニク
ス M6100」) 37部
ジエチルグリコ ルジアクリレート 13部
実施例 4
実施例1の結合剤を下記のように変えて実施例
1と同様に処理してサンプルNo.9を得た。
塩ビ酢ビマレイン酸共重合体(塩ビ92、酢ビ
4、マレイン酸4) 50部
エーテルアクリレートオリゴマー(ダイヤモン
ドジヤムロツク製「ホトマー4028」) 37部
トリメチロールプロパントリアクリレート13部
比較例 6
実施例1の結合剤を下記のように変えて実施例
1と同様に処理してサンプルNo.10を得た。
オリゴアクリレート(東亜合成社製のM−
8030:二重結合数3つ、分子量2000) 50部
熱可塑性ポリウレタン(エスタン5702:ビー・
エフ・グツドリツチ社) 50部
比較例 7
実施例1の結合剤を下記のように変えて実施例
1と同様に処理してサンプルNo.11を得た。
ポリエステルポリオールの両末端OHをアクリ
ル変性したもの(Mw=6000) 50部
ポリエステルポリオールの両末端OHをアクリ
ル変性したもの(Mw=500) 50部
実施例1〜4、比較例1〜7のサンプルはビデ
オテープレコーダーで100回くり返し走行したと
きの動摩擦係数、シリンダの汚れ、スチル耐久時
間を測定し、結果を表1に示した。
【表】
【表】 DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic recording media such as video tapes, audio tapes, and computer tapes. Magnetic recording media that are currently widely used include thermoplastic resins such as vinyl chloride-vinyl acetate resins, vinyl chloride-vinylidene chloride resins, cellulose resins, acetal resins, urethane resins, and acrylonitrile butadiene resins. The mixture is used as a binder, but this method has the disadvantage that the abrasion resistance of the magnetic layer is poor and the running path of the magnetic tape is contaminated. It is also known to use a thermosetting resin such as a melamine resin or a urea resin, or to add a crosslinkable binder such as an isocyanate compound or an epoxy compound to the thermoplastic resin through a chemical reaction. However, when a crosslinking binder is used, the storage stability of the resin solution in which the magnetic material is dispersed is poor (that is, the pot life is short), and the uniformity of the physical properties of the magnetic coating liquid is affected. It has the disadvantage that homogeneity cannot be maintained) and that a heat treatment step is required to harden the coating film after coating and drying, and it takes a long time to produce a product. In order to prevent these drawbacks, a method for producing magnetic materials has been proposed in which acrylic ester oligomers and monomers are used as binders, and after drying, they are cured by electron beam irradiation (Japanese Patent Publication No. 1973-
No. 12423, JP-A-47-13639, JP-A-47-15104
No., JP-A-50-77433, JP-A-56-25231, etc.).
However, the manufacturing method disclosed in the above patent did not produce a magnetic recording medium with advanced mechanical and electrical properties. In addition, for long-term recording on magnetic tapes, it is required to make the support thinner, and there is a demand for improvement in the mechanical properties of the magnetic layer. Furthermore, in the case of video tapes, for example, as video cassette recorders have become more multi-functional, harsh operating conditions are being required for magnetic tapes, and it is important to provide the magnetic layer with mechanical properties that satisfy these demands. I couldn't. In particular, JP-A-56-25231
When using a mixture of a thermoplastic resin and an acrylic compound as disclosed in the above issue, if the acrylic compound is too large, sufficient still durability cannot be obtained, and on the other hand, if the thermoplastic resin is too large, the magnetic layer tends to peel off. The tape running path of a recorder or other device is soiled or the head is soiled. This is considered to be due to insufficient polymerization by the electron beam. The present inventors have solved the drawbacks of conventional techniques such as methods using thermoplastic resins and thermosetting resins, methods adding crosslinkable binders through chemical reactions, and methods using hardenable binders through electron beam crosslinking. The present invention was arrived at as a result of extensive research for improvement. The purpose of the present invention is, firstly, to provide a magnetic recording medium with excellent electromagnetic conversion characteristics even after repeated running, and secondly, to provide a magnetic recording medium having a magnetic layer with excellent mechanical properties. As shown in Fig. 3, it is an object to provide a homogeneous magnetic recording medium with good storage stability of a magnetic coating liquid, and a fourth object is to provide a magnetic recording medium with excellent wear resistance. The fifth object is to provide a magnetic recording medium that does not require a heat treatment process for curing the coating film. The above object of the present invention is to prepare a compound having a molecular weight of 1000 or more and containing two or more acryloyl or methacryloyl groups in the molecule, and a compound having a molecular weight of 600 or less and containing two or more acryloyl or methacryloyl groups in the molecule. A magnetic recording medium containing a fat composition containing 30 to 300 parts by weight of a thermoplastic resin as a binder to 100 parts by weight of a mixture consisting of 40 to 10 parts by weight of compounds containing the above, and irradiated with an electron beam. It will be achieved. That is, the feature of the present invention is that a compound having a molecular weight of 1000 and containing two or more acryloyl groups or methacryloyl groups in the molecule that can be polymerized by electron beams.
By using a combination of the above oligomers and a polyfunctional acrylate monomer with a molecular weight of 600 or less, mixed with a plastic resin, and used as a binder, durability with repeated use can be improved, and stains on the magnetic tape running path and head can be prevented. The problem was solved. As the thermoplastic resin in the present invention, vinyl chloride
Vinyl acetate copolymer, vinyl chloride-vinyl propionate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-vinyl propionate-vinyl alcohol copolymer, etc. Cellulose resins such as salt vinyl acetate copolymers, cellulose acetate, cellulose diacetate, cellulose triacetate, cellulose acetate butyrate, cellulose acetate nitrate, cellulose nitrate, polycarbonate resins, polyamide resins, epoxy resins, acetal resins , urethane resin, acrylonitrile-butadiene copolymer, ethylene-vinyl acetate copolymer, etc., and these may be used in combination. Compounds with a molecular weight of 1000 or more and containing two or more acryloyl groups or methacryloyl groups in the molecule (acrylate oligomers) include acryloyl groups,
Or compounds with methacryloyl group, these are A.Vrancken “Fatipec Congress”
11 19 (1972). For example, the following compounds The polyester skeleton of the exemplified compound may be an epoxy resin skeleton, a polyether skeleton, a polycarbonate skeleton, or a mixture thereof. The molecular weight is preferably 1000 to 2000, but is not particularly limited. Compounds (acrylate monomers) with a molecular weight of 600 or less and containing two or more acryloyl or methacryloyl groups in the molecule include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, and triethylene glycol di(meth)acrylate. , tetraethylene glycol di(meth)acrylate, hexaethylene glycol di(meth)acrylate,
Propanediol di(meth)acrylate, Butanediol di(meth)acrylate, Pentanediol di(meth)acrylate, Neopentyl glycol di(meth)acrylate, Hexanediol di(meth)acrylate, Cyclohexanediol di(meth)acrylate, Tri Methylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, and other polyol poly(meth)acrylates with a molecular weight of 600 or less. The preferred weight ratio of acrylate oligomer to acrylate monomer is 60-90/40-10, and the ratio of this mixture to thermoplastic polymer is:
100/30 to 300 is preferred. Particularly preferred ranges include a ratio of acrylate oligomer to monomer of 70 to 85/30 to 15, and a ratio of acrylate compound mixture to thermoplastic polymer of 100/50.
~200. If the amount of the monomer is decreased or increased beyond this range, or if the amount of the thermoplastic polymer acrylate oligomer is increased, the polymerization rate by electron beams will be undesirably low. A large amount of electron beam is required for polymerization, and if it is excessive, it will stain the running path of the tape. On the other hand, if the amount of the thermoplastic polymer or acrylate oligomer was reduced, problems such as poor still durability and peeling of the magnetic layer occurred. Furthermore, the composition of the present invention may contain a compound having one carbon-carbon unsaturated bond in the molecule and capable of being polymerized by electron beams. As the ferromagnetic powder used in the present invention, ferromagnetic iron oxide fine powder, Co-doped ferromagnetic iron oxide fine powder, ferromagnetic chromium dioxide fine powder, ferromagnetic alloy powder barium ferrite, etc. can be used. The acicular ratio of ferromagnetic iron oxide and chromium dioxide is 2/1 to 20/1.
degree, preferably 5/1 or more, average length is 0.2 to 2.0μ
A range of about m is effective. The ferromagnetic alloy powder has a metal content of 75 w′t% or more, and 80 wt% or more of the metal content is ferromagnetic metal (i.e., Fe, Co, Ni, Fe-Co,
Fe−Ni, Co−Ni, Fe−Co−Ni) with a major axis of approx.
Particles of 1.0 μm or less. Examples of organic solvents include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; esters such as methyl acetate, ethyl acetate, butyl acetate, ethyl lactate, and glycol acetate monoethyl ether; ether, glycol dimethyl ether, and glycol monoethyl ether. , glycol ethers such as dioxane; aromatic hydrocarbons such as benzene, toluene, xylene;
Chlorinated hydrocarbons such as methylene chloride, ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin, and dichlorobenzene can be selected and used. Furthermore, additives such as lubricants, abrasives, dispersants, rust preventives, and antistatic agents may be added to the magnetic coating liquid of the present invention. In particular, lubricants include saturated and unsaturated higher fatty acids, fatty acid esters, higher fatty acid amides, higher alcohols, silicone oils, mineral oils, food oils, and fuso-based compounds, which may be added when preparing the coating solution. Further, after drying, smoothing treatment, or electron beam curing, it may be dissolved in an organic solvent or directly applied or sprayed onto the surface of the magnetic layer. Materials for the support to which the magnetic coating liquid is applied include polyethylene terephthalate, polyethylene-2,
Polyesters such as 6-naphthalate; polyolefins such as polyethylene and polypropylene; cellulose derivatives such as cellulose triacetate;
In addition to plastics such as polycarbonate, polyimide, and polyamideimide, non-magnetic metals such as aluminum, copper, tin, zinc, or non-magnetic alloys containing these, depending on the purpose; paper, paper such as paper coated with or laminated with polyolefins; can also be used. In addition, the form of the non-magnetic support is film, tape,
It may be a sheet, a disk, a card, a drum, etc., and various materials are selected as necessary depending on the form. In addition, the support of the present invention has a surface opposite to the side on which the magnetic layer is provided (back surface) for the purpose of preventing static electricity, preventing transfer, preventing wow and flutter, improving the strength of the magnetic recording medium, and making the back surface matte. It may be coated with a so-called back coat. The composition, method, etc. used in the present invention are described in Japanese Patent Publication No. 52-108804. As the electron beam accelerator, a scanning method, a double scanning method, a curtain beam method, or a broad beam curtain method can be adopted.
The electron beam characteristics include an accelerating voltage of 100 to 1000 kV,
Preferably 150-300kV, as absorbed dose
The amount is 0.5 to 20 megarads, preferably 3 to 15 megarads. When the accelerating voltage is less than 100 kV, the amount of energy transmitted is insufficient, and when it exceeds 1000 kV, the energy efficiency used for polymerization decreases, making it uneconomical.
If the absorbed dose is less than 0.5 megarads, the curing reaction will be insufficient and the strength of the magnetic layer will not be obtained, and if it exceeds 20 megarads, the energy efficiency used for curing will decrease, the irradiated object will generate heat, and the plastic support will be particularly damaged. This is not desirable because it deforms the body. The present invention will be explained in more detail below using Examples and Comparative Examples. In the following Examples and Comparative Examples, all "parts" indicate "parts by weight." Example 1 γ-Fe 2 O 3 400 parts Nitrocellulose (Daicel RS1/2H) 60 parts Ester acrylate oligomer (Toagosei "Aronix M6100") 33 parts Diethylene glycol diacrylate 7 parts Lecithin 4 parts Stearic acid 4 parts Butyl Stearate methyl ethyl ketone 1000 parts The above ingredients were kneaded in a ball mill for 50 hours, and the obtained magnetic coating liquid was applied onto a 15μ polyethylene terephthalate support using a doctor blade to a dry film thickness of 5μ, and a cobalt magnet was applied. After the solvent was oriented using the wafer, the solvent was dried (100° C./min). Thereafter, smoothing treatment was performed using a five-stage calender consisting of a group of cotton rolls and mirror-finished rolls (roll temperature: 60°C, pressure: 100 kg/cm 2 ). Then, at an accelerating voltage of 200 kV and a beam current of 10 mA,
Irradiation was performed to give an absorbed dose of 10 Mrad. Let this sample be No. 1. Example 2 Sample No. 2 was obtained in the same manner as in Example 1 except that the binder used in Example 1 was changed as follows. (However, the calender roll temperature is 30℃) Urethane resin (adipic acid, butanediol,
Tolylene diisocyanate condensate) 30 parts Epoxy acrylate oligomer (Showa Kobunshi "Lipoxy sp1507") 45 parts Trimethylolpropane triacrylate 15 parts Same as Example 1 except that the binder in Example 1 was changed as shown below. Processed. Comparative Example 1 (Sample No. 3) Nitrocellulose (RS1/2H) 80 parts Ester acrylate oligomer ("Aronix M6100") 15 parts Diethylene glycol diacrylate 5 parts Comparative Example 2 (Sample No. 4) Nitrocellulose (RS1/2H) 20 parts Ester acrylate oligomer ("Aronix M6100") 65 parts Diethylene glycol diacrylate 15 parts Comparative example 3 (Sample No. 5) Nitrocellulose (RS1/2H) 60 parts Ester acrylate oligomer ("Aronix M6100") 37 parts Diethylene glycol diacrylate 3 parts Comparative Example 4 (Sample No. 6) Nitrocellulose (RS1/2H) 60 parts Ester acrylate oligomer ("Aronix M6100") 20 parts Diethyl glycol diacrylate 20 parts Comparative Example 5 The binder of Example 1 was mixed as follows. Sample 7 was obtained by processing in the same manner as in Example 1 except that the calender roll temperature was 30°C. Urethane resin (same as in Example 2) 80 parts epoxy acrylate oligomer (lipoxy
sp1507'') 15 parts Trimethylolpropane triacrylate 5 parts Example 3 Sample No. 8 was obtained in the same manner as in Example 1 except that the binder in Example 1 was changed as shown below. PVC vinegar vinyl alcohol copolymer (PVC 86,
(10 parts vinyl acetate, 4 parts vinyl alcohol) 50 parts Ester acrylate oligomer (Aronix M6100) 37 parts Diethyl glycol diacrylate 13 parts Example 4 Treated in the same manner as in Example 1 except that the binder in Example 1 was changed as shown below. Sample No. 9 was obtained. Vinyl chloride acetate-bimaleic acid copolymer (PVC 92, vinyl acetate 4, maleic acid 4) 50 parts Ether acrylate oligomer (Diamond Jamrock "Photomer 4028") 37 parts Trimethylolpropane triacrylate 13 parts Comparative example 6 Example 1 Sample No. 10 was obtained in the same manner as in Example 1 except that the binder was changed as shown below. Oligoacrylate (M- manufactured by Toagosei Co., Ltd.
8030: 3 double bonds, molecular weight 2000) 50 parts thermoplastic polyurethane (Estan 5702: B-
Comparative Example 7 Sample No. 11 was obtained in the same manner as in Example 1 except that the binder used in Example 1 was changed as shown below. Polyester polyol with acrylic-modified OH on both ends (Mw = 6000) 50 parts Polyester polyol with acrylic-modified OH on both ends (Mw = 500) 50 parts The samples of Examples 1 to 4 and Comparative Examples 1 to 7 were The dynamic friction coefficient, cylinder dirt, and still durability time were measured using a video tape recorder when the vehicle was run 100 times, and the results are shown in Table 1. [Table] [Table]
Claims (1)
り、該磁性層の結合剤は、分子量が1000以上でア
クリロイル基もしくはメタクリロイル基を分子中
に2個以上含む化合物 60〜90重量部と、分子量
が600以下でアクリロイル基もしくはメタクリロ
イル基を分子中に2個以上含む化合物 40〜10重
量部から成る混合物100重量部に対して熱可塑性
樹脂を30〜300重量部含む樹脂組成物であり、該
結合剤は電子線照射してなることを特徴とする磁
気記録媒体。1 Consisting of a support and a magnetic layer provided thereon, the binder for the magnetic layer is 60 to 90 parts by weight of a compound with a molecular weight of 1000 or more and containing two or more acryloyl groups or methacryloyl groups in the molecule, and a molecular weight of 60 to 90 parts by weight. is 600 or less and contains two or more acryloyl groups or methacryloyl groups in the molecule. A resin composition containing 30 to 300 parts by weight of a thermoplastic resin to 100 parts by weight of a mixture consisting of 40 to 10 parts by weight, A magnetic recording medium characterized in that the agent is formed by irradiation with an electron beam.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17007882A JPS5958623A (en) | 1982-09-29 | 1982-09-29 | Magnetic recording medium |
DE19833334958 DE3334958C2 (en) | 1982-09-27 | 1983-09-27 | Magnetic recording material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17007882A JPS5958623A (en) | 1982-09-29 | 1982-09-29 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5958623A JPS5958623A (en) | 1984-04-04 |
JPH0458650B2 true JPH0458650B2 (en) | 1992-09-18 |
Family
ID=15898229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17007882A Granted JPS5958623A (en) | 1982-09-27 | 1982-09-29 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5958623A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0740346B2 (en) * | 1985-11-01 | 1995-05-01 | 大日本印刷株式会社 | Magnetic recording medium |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5625231A (en) * | 1979-08-06 | 1981-03-11 | Sony Corp | Magnetic recording medium |
JPS56122802A (en) * | 1980-03-03 | 1981-09-26 | Toyo Ink Mfg Co Ltd | Radiation-curable resin composition |
-
1982
- 1982-09-29 JP JP17007882A patent/JPS5958623A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5625231A (en) * | 1979-08-06 | 1981-03-11 | Sony Corp | Magnetic recording medium |
JPS56122802A (en) * | 1980-03-03 | 1981-09-26 | Toyo Ink Mfg Co Ltd | Radiation-curable resin composition |
Also Published As
Publication number | Publication date |
---|---|
JPS5958623A (en) | 1984-04-04 |
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