JPS62217420A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62217420A JPS62217420A JP6019686A JP6019686A JPS62217420A JP S62217420 A JPS62217420 A JP S62217420A JP 6019686 A JP6019686 A JP 6019686A JP 6019686 A JP6019686 A JP 6019686A JP S62217420 A JPS62217420 A JP S62217420A
- Authority
- JP
- Japan
- Prior art keywords
- radiation
- magnetic
- magnetic layer
- powder
- durability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920005989 resin Polymers 0.000 claims abstract description 34
- 239000011347 resin Substances 0.000 claims abstract description 34
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 26
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 26
- 230000005855 radiation Effects 0.000 claims abstract description 16
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 150000001875 compounds Chemical class 0.000 claims description 24
- 239000006247 magnetic powder Substances 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 12
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 abstract description 4
- 239000012948 isocyanate Substances 0.000 abstract description 4
- 239000000178 monomer Substances 0.000 abstract description 3
- 125000005442 diisocyanate group Chemical group 0.000 abstract description 2
- 229920006267 polyester film Polymers 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 238000003847 radiation curing Methods 0.000 abstract 3
- 239000007795 chemical reaction product Substances 0.000 abstract 1
- 150000002513 isocyanates Chemical class 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 15
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 229920000728 polyester Polymers 0.000 description 9
- 229920005992 thermoplastic resin Polymers 0.000 description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 8
- -1 isocyanate compound Chemical class 0.000 description 8
- 239000003973 paint Substances 0.000 description 8
- 229920002554 vinyl polymer Polymers 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 239000000020 Nitrocellulose Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010894 electron beam technology Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920001220 nitrocellulos Polymers 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- MPIAGWXWVAHQBB-UHFFFAOYSA-N [3-prop-2-enoyloxy-2-[[3-prop-2-enoyloxy-2,2-bis(prop-2-enoyloxymethyl)propoxy]methyl]-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(COC(=O)C=C)(COC(=O)C=C)COCC(COC(=O)C=C)(COC(=O)C=C)COC(=O)C=C MPIAGWXWVAHQBB-UHFFFAOYSA-N 0.000 description 2
- 231100000987 absorbed dose Toxicity 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 239000012461 cellulose resin Substances 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- DMYOHQBLOZMDLP-UHFFFAOYSA-N 1-[2-(2-hydroxy-3-piperidin-1-ylpropoxy)phenyl]-3-phenylpropan-1-one Chemical compound C1CCCCN1CC(O)COC1=CC=CC=C1C(=O)CCC1=CC=CC=C1 DMYOHQBLOZMDLP-UHFFFAOYSA-N 0.000 description 1
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
- FDSUVTROAWLVJA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol;prop-2-enoic acid Chemical compound OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OC(=O)C=C.OCC(CO)(CO)COCC(CO)(CO)CO FDSUVTROAWLVJA-UHFFFAOYSA-N 0.000 description 1
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- JRLTTZUODKEYDH-UHFFFAOYSA-N 8-methylquinoline Chemical group C1=CN=C2C(C)=CC=CC2=C1 JRLTTZUODKEYDH-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920013683 Celanese Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920001079 Thiokol (polymer) Polymers 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- SMEGJBVQLJJKKX-HOTMZDKISA-N [(2R,3S,4S,5R,6R)-5-acetyloxy-3,4,6-trihydroxyoxan-2-yl]methyl acetate Chemical compound CC(=O)OC[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O)OC(=O)C)O)O SMEGJBVQLJJKKX-HOTMZDKISA-N 0.000 description 1
- SORGEQQSQGNZFI-UHFFFAOYSA-N [azido(phenoxy)phosphoryl]oxybenzene Chemical compound C=1C=CC=CC=1OP(=O)(N=[N+]=[N-])OC1=CC=CC=C1 SORGEQQSQGNZFI-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229940081735 acetylcellulose Drugs 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 238000012644 addition polymerization Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 229920002601 oligoester Polymers 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
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 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
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は磁気記録媒体に関し、さらに詳しくは、耐久
性に優れた磁気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium with excellent durability.
〔従来の技術３
近年、磁気テープ等の磁気記録媒体においては、記録、
再生時間をできるだけ長くするため薄手化が図られてお
り、このように薄手化が指向される磁気テープ等にあっ
ては、強靭で耐久性に優れるとともに、電磁変換特性に
優れたものが要求される。また製造過程の便宜上いわゆ
るボットライフは長くすることが好ましい。[Conventional technology 3] In recent years, in magnetic recording media such as magnetic tape, recording,
In order to lengthen playback time as much as possible, efforts are being made to make magnetic tapes thinner, and such thinner magnetic tapes are required to be strong and durable, as well as having excellent electromagnetic conversion characteristics. Ru. Further, for convenience of the manufacturing process, it is preferable to make the so-called bot life long.
このため、近年、結合剤成分として放射線硬化型樹脂を
用いることが行われており、たとえば、多官能アクリレ
ート等の放射線硬化型樹脂を単独で、あるいは熱可塑性
樹脂とともに併用し、放射線の照射により、放射線硬化
型樹脂を硬化させて磁性層を形成することが行われてい
る。（特開昭５９−１７５０２３号、特開昭５６−２５
２３０号）
〔発明が解決しようとする問題点〕
ところが、従来使用されている放射線硬化型樹脂は、磁
性粉末などの表面の水酸基と反応しないため、磁気テー
プの場合など走行時に粉落ちが生じるという難点があり
、未だ充分な耐久性が得られていない。For this reason, in recent years, radiation-curable resins have been used as binder components. For example, radiation-curable resins such as polyfunctional acrylates are used alone or in combination with thermoplastic resins, and by irradiation with radiation, A magnetic layer is formed by curing radiation-curable resin. (JP-A No. 59-175023, JP-A No. 56-25
(No. 230) [Problems to be Solved by the Invention] However, the radiation-curable resins that have been used so far do not react with the hydroxyl groups on the surface of magnetic powder, which causes particles to fall off when running, such as in the case of magnetic tapes. There are some drawbacks, and sufficient durability has not yet been achieved.
この発明はかかる現状に鑑み種々検討を行った結果なさ
れたもので、放射線硬化型樹脂と、少なくとも１以上の
イソシアネート基および少なくとも１以上の炭素炭素二
重結合を有するポリイソシアネート化合物とを磁性粉末
の結合剤成分として併用し、放射線でこれを硬化して磁
性層を形成することによって、磁性層を強靭なものとし
、耐久性を充分に向上させたものである。This invention was made as a result of various studies in view of the current situation, and was made by combining a radiation curable resin and a polyisocyanate compound having at least one isocyanate group and at least one carbon-carbon double bond into a magnetic powder. By using it together as a binder component and curing it with radiation to form a magnetic layer, the magnetic layer is made strong and its durability is sufficiently improved.
この発明において使用される放射線硬化型樹脂は、放射
線重合性の二重結合を有する単量体、オリゴマーないし
ポリマーで、磁性粉末の分散性および充填性に優れ、ポ
リイソシアネート化合物との相溶性もよい。従って、こ
の放射線硬化型樹脂を、少なくとも１以上のイソシアネ
ート基および少なくとも１以上の炭素炭素二重結合を有
するポリイソシアネート化合物と併用して磁性塗料を調
製し、基体上に塗布した後、放射線を照射して重合硬化
させると、強靭で電磁変換特性に優れた磁性層が形成さ
れ、併用されたポリイソシアネート化合物のイソシアネ
ート基が磁性粉末表面の水酸基と良好に反応して結合す
るため粉落ち等もなく、耐久性および電磁変換特性に優
れた磁気記録媒体が得られる。特に、水酸基を含有する
８に射線硬化型樹脂をポリイソシアネート化合物と併用
する場合は、ポリイソシアネート化合物の１以上のイソ
シアネート基が、磁性粉末表面の水酸基および放射線硬
化型樹脂の水酸基と架橋結合するため、粉落ち等が生じ
ることなく磁性層の塗膜強度が一段と向上され、耐久性
がさらに向上される。また、放射線硬化型樹脂を併用し
ているため、磁性粉末表面の水酸基と過不足なく反応架
橋することを期待して配合したポリイソシアネート化合
物の未反応物が、混線分散時の溶剤中あるいは、塗膜を
とりまく雰囲気中の水分と反応して低分子のまま塗膜中
に残存することがあったとしても、その分子中に有する
炭素炭素二重結合が、放射線硬化型樹脂と電子線架橋に
よって結合されるため、ポリイソシアネート化合物のイ
ソシアネート基が水分と反応してできる低分子イソシア
ネート化合物によって、耐久性が低下されることもない
。The radiation-curable resin used in this invention is a monomer, oligomer or polymer having a radiation-polymerizable double bond, and has excellent dispersibility and filling properties for magnetic powder, and good compatibility with polyisocyanate compounds. . Therefore, a magnetic paint is prepared by using this radiation-curable resin in combination with a polyisocyanate compound having at least one isocyanate group and at least one carbon-carbon double bond, and after coating it on a substrate, it is irradiated with radiation. When polymerized and cured, a strong magnetic layer with excellent electromagnetic conversion properties is formed, and the isocyanate groups of the polyisocyanate compound used in combination react well with the hydroxyl groups on the surface of the magnetic powder and bond, so there is no powder drop. , a magnetic recording medium with excellent durability and electromagnetic conversion characteristics can be obtained. In particular, when a radiation curable resin is used in combination with a polyisocyanate compound for 8 containing a hydroxyl group, one or more isocyanate groups of the polyisocyanate compound crosslink with the hydroxyl group on the surface of the magnetic powder and the hydroxyl group of the radiation curable resin. The strength of the coating film of the magnetic layer is further improved without powder falling off, etc., and the durability is further improved. In addition, since a radiation-curable resin is used in combination, unreacted polyisocyanate compounds, which are blended with the expectation that they will react and crosslink in just the right amount with hydroxyl groups on the surface of the magnetic powder, may be present in the solvent during cross-dispersion or in the coating. Even if it reacts with moisture in the atmosphere surrounding the film and remains in the coating film as a low molecular weight, the carbon-carbon double bonds in the molecule are bonded to the radiation-curable resin through electron beam crosslinking. Therefore, the durability is not reduced by a low molecular weight isocyanate compound formed by the reaction of the isocyanate group of the polyisocyanate compound with moisture.
このような放射線硬化型樹脂としては、分子量が５００
〜２００００で、１分子当たりの二重結合の数が１〜２
０のものが好ましく使用され、たとえば、メタクリル酸
メチル、アクリル酸メチル、アクリル酸ブチル、アクリ
ル酸、メククリル酸等のアクリル系モノマーあるいはこ
れらの混合物、スチレンと酢酸ビニルとアクリロニトリ
ルとの混合物、２−ヒドロキシエチルメタクリレートと
ジメチルアミノエチルメタクリレートとグリシジルメタ
クリレートとの混合物、トリメチロールプロパントリメ
タクリレート、ジペンタエリスリトールへキサアクリレ
ート、ジペンタエリスリトールペンタアクリレート、ウ
レタンアクリルオリゴマー、エポキシアクリルオリゴマ
ー、ポリエステルアクリルオリゴマー、ポリブタジェン
アクリルオリゴマー、ポリアミドアクリルオリゴマー、
ポリエーテルアクリルオリゴマー、オリゴエステルアク
リルオリゴマー、スピロアセクールアクリルオリゴマー
などが好ましく使用される。市販品の具体例としては、
たとえば、新中村化学工業社製ＴＭＰＴ、日本化薬社製
ＤＰＨＡ、ＤＰＰＡ、東亜合成社製Ｍ−６２５０，Ｍ−
７１００，Ｍ−８０３０、Ｍ−１１００、Ｍ−１２００
、チオコール社製Ｕ−７８２、Ｕ−７８３、Ｕ−７８８
、Ｕ−８９３、昭和高分子社製ＶＲ−６０，５Ｐ−４０
１０、Ｕ−３０００，Ｅ−４０００、セラニーズ社製３
２００．３５００．３６００．３７００、三洋化成社製
ＵＶＵ〜５１２等が挙げられる。Such a radiation-curable resin has a molecular weight of 500
~20,000, the number of double bonds per molecule is 1-2
For example, acrylic monomers such as methyl methacrylate, methyl acrylate, butyl acrylate, acrylic acid, meccrylic acid or mixtures thereof, mixtures of styrene, vinyl acetate and acrylonitrile, 2-hydroxy Mixture of ethyl methacrylate, dimethylaminoethyl methacrylate and glycidyl methacrylate, trimethylolpropane trimethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, urethane acrylic oligomer, epoxy acrylic oligomer, polyester acrylic oligomer, polybutadiene acrylic oligomer , polyamide acrylic oligomer,
Polyether acrylic oligomers, oligoester acrylic oligomers, spiroacecool acrylic oligomers, and the like are preferably used. Specific examples of commercially available products include:
For example, TMPT manufactured by Shin Nakamura Chemical Industry Co., Ltd., DPHA and DPPA manufactured by Nippon Kayaku Co., Ltd., M-6250 and M- manufactured by Toagosei Co., Ltd.
7100, M-8030, M-1100, M-1200
, Thiokol U-782, U-783, U-788
, U-893, Showa Kobunshi Co., Ltd. VR-60, 5P-40
10, U-3000, E-4000, Celanese 3
200.3500.3600.3700, UVU~512 manufactured by Sanyo Chemical Co., Ltd., and the like.
また、少なくとも１以上のイソシアネート基とともに１
以上の炭素炭素二重結合を有するポリイソシアネート化
合物としては、たとえば、トリレンジイソシアネー１−
１４．４”−ジフェニルメタンジイソシアネート、ヘキ
サメチレンジイソシアネート等のジイソシアネート化合
物１モルとアクリル酸１モルとを反応させて得られるポ
リイソシアネート化合物、また通常１モルのトリオール
と３モルのジイソシアネートとを反応させて得られる三
官能性低分子量イソシアネート化合物１モルとアクリル
酸１モルとを反応させて得られるポリイソシアネート化
合物、さらに遊離のイソシアネート基を末端に有しかつ
アクリル系二重結合を有する低分子量ポリウレタン樹脂
などが好適なものとして使用され、この種の炭素炭素二
重結合を有するポリイソシアネート化合物を併用すると
きは、放射線硬化型樹脂が水酸基を含有しなくても、こ
の種のポリイソシアネート化合物を介して磁性粉末表面
の水酸基と放射線硬化型樹脂とがともに架橋結合し、磁
性層の塗膜強度が一段と向上され、耐久性が充分に向上
される。このようにこの種のポリイソシアネート化合物
が、放射線硬化型樹脂と併用されると、一段と強靭な磁
性層が形成され、粉落ち等もなく耐久性が充分に向上さ
れる。In addition, 1 with at least one isocyanate group
Examples of polyisocyanate compounds having the above carbon-carbon double bonds include tolylene diisocyanate 1-
14. Polyisocyanate compounds obtained by reacting 1 mole of a diisocyanate compound such as 4"-diphenylmethane diisocyanate and hexamethylene diisocyanate with 1 mole of acrylic acid, or usually obtained by reacting 1 mole of triol with 3 moles of diisocyanate. A polyisocyanate compound obtained by reacting 1 mole of a trifunctional low molecular weight isocyanate compound with 1 mole of acrylic acid, and a low molecular weight polyurethane resin having a free isocyanate group at the end and an acrylic double bond, etc. When used together with a polyisocyanate compound having this type of carbon-carbon double bond, magnetic powder can be formed through this type of polyisocyanate compound even if the radiation-curable resin does not contain a hydroxyl group. Both the hydroxyl groups on the surface and the radiation-curable resin are cross-linked, and the coating strength of the magnetic layer is further improved, and the durability is sufficiently improved.In this way, this type of polyisocyanate compound When used in combination with the above, an even stronger magnetic layer is formed, and the durability is sufficiently improved without any powder falling off.
このようなポリイソシアネート化合物は、結合剤成分全
量に対して５重量％以上使用するのが好ましく、５重量
％より少ないと磁性粉末表面と充分に結合せず粉落ちが
生じるおそれがあり、耐久性が充分に改善されない。It is preferable to use such a polyisocyanate compound in an amount of 5% by weight or more based on the total amount of the binder components. If it is less than 5% by weight, it may not bond sufficiently with the surface of the magnetic powder and may cause powder to fall off, resulting in poor durability. is not sufficiently improved.
このように、少なくとも１以上のイソシアネート基とと
もに１以上の炭素炭素二重結合を有するポリイソシアネ
ート化合物を放射線硬化型樹脂と併用する際、ざらに熱
可塑性樹脂を併用してもよく、一般に磁気記録媒体に使
用される磁性粉末の分散性および耐久性に優れた熱可塑
性樹脂と併用すると、さらに磁性層の強度が向上されて
、耐久性および電磁変換特性に優れた磁気記録媒体が得
られる。特に水酸基を含有する熱可塑性樹脂を併用する
場合は、ポリイソシアネート化合物と架橋結合するため
磁性層の塗膜強度がさらに一段と向上され、耐久性がさ
らに向−ヒされる。In this way, when a polyisocyanate compound having at least one isocyanate group and one or more carbon-carbon double bonds is used in combination with a radiation-curable resin, a thermoplastic resin may also be used in combination, and it is generally used in magnetic recording media. When used in combination with a thermoplastic resin that has excellent dispersibility and durability of the magnetic powder used in the above, the strength of the magnetic layer is further improved, and a magnetic recording medium with excellent durability and electromagnetic conversion characteristics can be obtained. In particular, when a thermoplastic resin containing a hydroxyl group is used in combination, the strength of the coating film of the magnetic layer is further improved due to crosslinking with the polyisocyanate compound, and the durability is further improved.
このようにポリイソシアネート化合物および放射線硬化
型樹脂とともに併用される熱可塑性樹脂としては、塩化
ビニル系樹脂、ポリビニルアセクール系樹脂、繊維素系
樹脂、ポリエステル系樹脂など、一般に磁気記録媒体に
使用されるものがいずれも好適なものとして使用される
。塩化ビニル系樹脂としては、塩化ビニル−酢酸ビニル
共重合体、塩化ビニル−酢酸ビニル−ビニルアルコール
共重合体、塩化ビニル−酢酸ビニル−マレイン酸共重合
体、塩化ビニル−プロピオン酸ビニル共重合体などが好
適なものとして使用され、具体例としては、たとえば、
米国Ｕ、Ｃ，Ｃ，社製Ｖ Ｙ ＨＨ１■Ａ Ｇ ＨｌＶ
Ｍ ＣＨ１積水化学工業社製エスレックＡ１エスレソ
クＣＮ、東洋曹達社製リューロンＱＳ−４３０、リュー
ロンＱＡ−４３１などが挙げられる。また、ポリビニル
アセクール系樹脂としては、たとえばポリビニルブチラ
ール樹脂などが好適なものとして使用され、具体例とし
ては、たとえば、積木化学工業社製エスレソクＢＬＳ、
エスレックＢＭＳ、エスレックＢＬ−１、ヘキストジャ
パン社製モビタールＢなどが挙げられる。繊維素系樹脂
としては、たとえばニトロセルロース、アセチルセルロ
ース、アセチルブチルセルロース、メチルセルロース、
エチルセルロース、ベンジルセルロース、カルボキシメ
チルセルロース、ヒドロキシセルロースなどが好適なも
のとして使用され、具体例としては、たとえば、旭化成
社製ニトロセルロースＬ １／２、Ｌ１／４、ＬＬ、Ｈ
１／４、Ｈ１／２、Ｈｌ、Ｈ５、ダイセル社製ニトロセ
ルロースＲ３１／１６、Ｒ３Ｉ／２、Ｒ３１、Ｒ３２な
どが挙げられる。さらに、ポリエステル系樹脂としては
、通常使用されている分子量が１００００〜ａｏｏｏｏ
程度の飽和または不飽和ポリエステル樹脂、或いはスル
ホン基もしくはスルホン酸金属塩基を含有するポリエス
テル樹脂などが好適なものとして使用され、具体例とし
ては、たとえば、東洋紡績社製バイロン＃２００、バイ
ロン＃３００、バイロン＃４００、ポリエステルＧＸ−
Ｗ１などが挙げられる。Thermoplastic resins used together with polyisocyanate compounds and radiation-curable resins include vinyl chloride resins, polyvinyl acecool resins, cellulose resins, polyester resins, etc., which are generally used in magnetic recording media. Any of these may be used as suitable. Examples of vinyl chloride resins include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-vinyl propionate copolymer, etc. is preferably used, and specific examples include, for example,
Manufactured by U, C, C, USA V Y HH1 A G HlV
Examples include M CH1 S-LEC A1 S-RESOC CN manufactured by Sekisui Chemical Co., Ltd., Ryuron QS-430 and Ryuron QA-431 manufactured by Toyo Soda Co., Ltd. In addition, as the polyvinyl acecool resin, for example, polyvinyl butyral resin is preferably used, and specific examples include SRESOC BLS manufactured by Block Chemical Industry Co., Ltd.
Examples include S-LEC BMS, S-LEC BL-1, and Mobital B manufactured by Hoechst Japan. Examples of cellulose resins include nitrocellulose, acetylcellulose, acetylbutylcellulose, methylcellulose,
Ethyl cellulose, benzyl cellulose, carboxymethyl cellulose, hydroxy cellulose, etc. are preferably used, and specific examples include nitrocellulose L 1/2, L 1/4, LL, H manufactured by Asahi Kasei Corporation.
Examples include 1/4, H1/2, H1, H5, nitrocellulose R31/16, R3I/2, R31, and R32 manufactured by Daicel. Furthermore, as a polyester resin, the molecular weight commonly used is 10,000 to aooooo.
Suitable examples include saturated or unsaturated polyester resins, polyester resins containing sulfonic groups or sulfonic acid metal bases, and specific examples include Vylon #200, Vylon #300 manufactured by Toyobo Co., Ltd. Byron #400, polyester GX-
Examples include W1.
このような熱可塑性樹脂を併用する場合、前記の放射線
硬化型樹脂との配合割合は、重量比で熱可塑性樹脂対放
射線硬化型樹脂にして２０対８０〜８０対２０の範囲内
にするのが好ましく、熱可塑性樹脂が少なすぎると磁性
粉末の分散性が良好にならず、放射線硬化型樹脂が少な
くすぎると充分に強靭な磁性層が得られない。When such a thermoplastic resin is used in combination, the blending ratio with the radiation-curable resin should be within the range of 20:80 to 80:20 in terms of weight ratio of thermoplastic resin to radiation-curable resin. Preferably, if the thermoplastic resin is too small, the dispersibility of the magnetic powder will not be good, and if the radiation curable resin is too small, a sufficiently strong magnetic layer will not be obtained.
この発明で使用される放射線硬化型樹脂を重合硬化させ
るに際して使用される放射線は、電子線などのβ線、お
よび紫外線、Ｘ線などのγ線などがいずれも好適に使用
され、紫外線を使用するときは照射による効果をより効
率的にするため増感剤が同時に使用される。このような
放射線の照射は加速電圧１５０〜７５０ＫＶの放射線を
用い、吸収線量が３〜１５Ｍｒａｄとなるように照射す
るｌｌ
のが好ましく、吸収線量が少なすぎると前記放射線硬化
型樹脂の架橋結合が不充分で所期の効果が得られない。The radiation used in polymerizing and curing the radiation-curable resin used in this invention includes beta rays such as electron beams, and gamma rays such as ultraviolet rays and X-rays, and ultraviolet rays are preferably used. Sometimes a sensitizer is used at the same time to make the effect of irradiation more efficient. It is preferable for such radiation irradiation to use radiation with an acceleration voltage of 150 to 750 KV so that the absorbed dose is 3 to 15 Mrad.If the absorbed dose is too small, the crosslinking of the radiation-curable resin may fail. It is insufficient and the desired effect cannot be obtained.
この発明の磁性層の形成は、前記の放射線硬化型樹脂と
ポリイソシアネート化合物、さらに必要に応じて熱可塑
性樹脂を加えた結合剤樹脂を、磁性粉末、有機溶剤およ
びその他の必要成分とともに分散混合して磁性塗料を調
製し、これをポリエステルフィルムなどの基体上に塗布
した後、放射線を照射して重合硬化することによって行
われるが、特に粉落ちを著しく減少させるために、この
組成のうちの磁性粉末と、前記のポリイソシアネート化
合物とを予め混練することによって、磁性粉末の水酸基
にイソシアネート基を反応させておくのが好ましい。な
お、放射線を照射する前または後に、キユアリングを行
うとポリイソシアネート化合物と磁性粉末表面との反応
が充分に行われ、磁性層の強度がさらに一段と強化され
るため、必要な場合はキユアリングを行ってもよく、こ
のキユアリングは、通常、室温で数日間あるいは３０〜
８０°Ｃで６〜１２０時間加熱して行われる。The magnetic layer of the present invention is formed by dispersing and mixing the above-mentioned radiation-curable resin, polyisocyanate compound, and a binder resin to which a thermoplastic resin is added if necessary, together with magnetic powder, an organic solvent, and other necessary components. This is done by preparing a magnetic coating material, coating it on a substrate such as a polyester film, and then polymerizing and curing it by irradiating it with radiation. It is preferable to react the isocyanate groups with the hydroxyl groups of the magnetic powder by kneading the powder and the polyisocyanate compound in advance. If curing is performed before or after irradiation with radiation, the reaction between the polyisocyanate compound and the surface of the magnetic powder will occur sufficiently, and the strength of the magnetic layer will be further strengthened, so curing should be performed if necessary. This curing is usually done for several days or 30 to 30 minutes at room temperature.
This is done by heating at 80°C for 6 to 120 hours.
ここに使用する磁性粉末としては、たとえば、γ−Ｆｅ
２０３粉末、Ｆｅ３Ｏ４粉末、Ｃｏ含有ｒ−Ｆｅ２０３
粉末、Ｃｏ含有Ｆｅ３Ｏ４粉末、ＣｒＯ２粉末の他、Ｆ
ｅ粉末、Ｃｏ粉末、Ｆｅ−Ｎｉ粉末などの金属粉末、バ
リウムフェライト、ストロンチウムフヱライト等の六方
晶フェライトなど従来公知の各種磁性粉末が広く使用さ
れる。As the magnetic powder used here, for example, γ-Fe
203 powder, Fe3O4 powder, Co-containing r-Fe203
powder, Co-containing Fe3O4 powder, CrO2 powder, F
Various conventionally known magnetic powders are widely used, such as metal powders such as e powder, Co powder, and Fe-Ni powder, and hexagonal ferrites such as barium ferrite and strontium ferrite.
また、有機溶剤としては、メチルイソブチルケトン、メ
チルエチルケトン、シクロヘキサノンなどのケトン系溶
剤、酢酸エチル、酢酸ブチルなどのエステル系溶剤、ヘ
ンゼン、トルエン、キシレンなどの芳香族炭化水素系溶
剤、ジメチルホルムアミドなどの酸アミド系溶剤、ジメ
チルスルホキシドなどのスルホキシド系溶剤、テトラヒ
ドロフラン、ジオキサンなどのエーテル系溶剤など、使
用する結合ギ１樹脂を溶解するのに適した溶剤が、単独
で、あるいは二種以上混合して使用されるが、本発明に
おいては上記のポリイソシアネート化合物中のイソシア
ネート基と反応するアルコール系溶剤の使用を回避する
ことが好ましい。Examples of organic solvents include ketone solvents such as methyl isobutyl ketone, methyl ethyl ketone, and cyclohexanone, ester solvents such as ethyl acetate and butyl acetate, aromatic hydrocarbon solvents such as Hensen, toluene, and xylene, and acids such as dimethylformamide. Solvents suitable for dissolving the binding resin used, such as amide solvents, sulfoxide solvents such as dimethyl sulfoxide, and ether solvents such as tetrahydrofuran and dioxane, are used alone or in combination of two or more. However, in the present invention, it is preferable to avoid the use of alcoholic solvents that react with the isocyanate groups in the polyisocyanate compound.
なお、この発明において上記のポリイソシアネート化合
物のイソシアネート基との反応を回避する考慮を払った
上で磁性塗料中に通常使用されている各種添加剤、例え
ば分散剤、潤滑剤、研磨剤、帯電防止剤などを任意に添
加使用してもよい。In addition, in this invention, various additives normally used in magnetic paints, such as dispersants, lubricants, abrasives, antistatic agents, etc., are added, taking into consideration to avoid reaction with the isocyanate groups of the polyisocyanate compound described above. Agents and the like may be optionally added.
次に、この発明の実施例について説明する。 Next, embodiments of the invention will be described.
実施例１
１．４−ブタンジオールとアジピン酸よりなるジオール
と、ヒドロキシエチルアクリレートとを付加重合させて
製造した分子量が２００００のポリエステルアクリレー
トを使用し、
Ｃｏ含有ｒ−Ｆｅ２０３粉末 ８０重量部ポリエステ
ルアクリレート１６〃
ジイソシアネート化合物（炭素 ４ 〃炭素二重結合
の数１）
ミリスチン酸 ０．８〃メチルイ
ソブチルケトン ５０〃トルエン
５０〃の組成物をボールミル中で４８時間混合
分散して磁性塗料を調製し、この磁性塗料を厚さ１２μ
ｍのポリエステルベースフィルム上に塗布、乾燥し、表
面処理を行った後、さらに６０℃で２４時間キユアリン
グを行い、厚さが約４メ１ｍの磁性層を形成した。次い
で、カレンダー処理後、ＥＳＩ社製カーテン型電子線照
射装置を用い、８Ｍｒａｄの照射線量で放射線を照射し
て硬化し、所定の巾に裁断して磁気テープをつくった。Example 1 Using polyester acrylate with a molecular weight of 20,000 produced by addition polymerization of a diol consisting of 1.4-butanediol and adipic acid and hydroxyethyl acrylate, Co-containing r-Fe203 powder 80 parts by weight Polyester acrylate 16 Diisocyanate compound (4 carbons, number of carbon double bonds 1) Myristic acid 0.8 Methyl isobutyl ketone 50 Toluene
A magnetic paint was prepared by mixing and dispersing the composition of No. 50 in a ball mill for 48 hours.
After coating, drying, and surface treatment on a polyester base film of 1.5 m, curing was further performed at 60° C. for 24 hours to form a magnetic layer with a thickness of about 4 m to 1 m. Next, after calendering, the material was cured by irradiating it with radiation at a dose of 8 Mrad using a curtain-type electron beam irradiation device manufactured by ESI, and was cut into a predetermined width to produce a magnetic tape.
実施例２
実施例１における磁性塗料の組成において、ポリエステ
ルアクリレート（分子量２００００）に代えてＶＲ−６
０（昭和高分子社製、ポリエポキシアクリレート、水酸
基含有放射線硬化型樹脂）を同量使用した以外は、実施
例１と同様にして磁気テープをつくった。Example 2 In the composition of the magnetic paint in Example 1, VR-6 was used instead of polyester acrylate (molecular weight 20,000).
A magnetic tape was produced in the same manner as in Example 1, except that the same amount of 0 (manufactured by Showa Kobunshi Co., Ltd., polyepoxy acrylate, hydroxyl group-containing radiation-curable resin) was used.
実施例３
実施例１における磁性塗料の組成において、ポリエステ
ルアクリレート（分子量２００００）の使用量を１６重
量部から８重量部に変更し、新たにＶＡＧＨ（米国Ｕ、
Ｃ，Ｃ社製、塩化ビニル−酢酸ビニル−ビニルアルコー
ル共重合体）を８重ｉｔ部加えた以外は、実施例１と同
様にして磁気テープをつくった。Example 3 In the composition of the magnetic paint in Example 1, the amount of polyester acrylate (molecular weight 20,000) was changed from 16 parts by weight to 8 parts by weight, and a new VAGH (U.S.
A magnetic tape was prepared in the same manner as in Example 1, except that 8 parts of vinyl chloride-vinyl acetate-vinyl alcohol copolymer (manufactured by C.C. Co., Ltd.) were added.
比較例１
実施例１における磁性塗料の組成において、ジイソシア
ネート化合物に代えてコロネ−１・Ｌ（日本ポリウレタ
ン工業社製、三官能性低分子量イソシアネート化合物）
を同量使用した以外は、実施例１と同様にして磁気テー
プをつくった。Comparative Example 1 In the composition of the magnetic paint in Example 1, Coronet-1.L (manufactured by Nippon Polyurethane Industries, Ltd., trifunctional low molecular weight isocyanate compound) was used instead of the diisocyanate compound.
A magnetic tape was produced in the same manner as in Example 1, except that the same amount of each was used.
比較例２
比較例１における磁性塗料の組成において、ポリエステ
ルアクリレート（分子量２００００）に代えてＶＲ−６
０（昭和高分子社製、ポリエポキシアクリレート、水酸
基含有放射線硬化型樹脂）を同量使用した以外は、比較
例１と同様にして磁気テープをつくった。Comparative Example 2 In the composition of the magnetic paint in Comparative Example 1, VR-6 was used instead of polyester acrylate (molecular weight 20,000).
A magnetic tape was produced in the same manner as in Comparative Example 1, except that the same amount of 0 (manufactured by Showa Kobunshi Co., Ltd., polyepoxy acrylate, hydroxyl group-containing radiation-curable resin) was used.
比較例３
比較例１における磁性塗料の組成において、ポリエステ
ルアクリレート（分子量２００００）の使用量を１６重
量部から８重量部に変更し、新たにＶＡＧＨ（米国１１
．Ｃ，Ｃ社製、塩化ビニル−酢酸ビニル−ビニルアルコ
ール共重合体）を８重１部加えた以外は、比較例１と同
様にして磁気テープをつくった。Comparative Example 3 In the composition of the magnetic paint in Comparative Example 1, the amount of polyester acrylate (molecular weight 20,000) was changed from 16 parts by weight to 8 parts by weight, and a new VAGH (US 11
．． A magnetic tape was produced in the same manner as in Comparative Example 1, except that 1 part of 8 parts of vinyl chloride-vinyl acetate-vinyl alcohol copolymer (manufactured by C.C. Co., Ltd.) was added.
各実施例および比較例で得られた磁気テープについて、
耐久性を調べ、摩擦係数および５ＭＨｚの出力を測定し
た。耐久性は、周速１ｍ／ｓｅｃで走行する磁気テープ
の磁性層に２ｇの鋼球を接触させ、磁性層のけずれが生
じるまでの時間を測定して調べた。Regarding the magnetic tapes obtained in each example and comparative example,
Durability was investigated, and the friction coefficient and 5 MHz output were measured. Durability was examined by bringing a 2 g steel ball into contact with the magnetic layer of a magnetic tape running at a circumferential speed of 1 m/sec, and measuring the time until the magnetic layer was scratched.
下記第１表はその結果である。Table 1 below shows the results.
第１表
〔発明の効果〕
上表から明らかなように、実施例１ないし３で得られた
磁気テープは、比較例１ないし３で得られた磁気テープ
に比し、耐久性がよくて、摩擦係数が小さく、このこと
からこの発明によって得られる磁気記録媒体は、強靭で
耐久性に優れていることがわかる。Table 1 [Effects of the Invention] As is clear from the above table, the magnetic tapes obtained in Examples 1 to 3 had better durability than the magnetic tapes obtained in Comparative Examples 1 to 3. The coefficient of friction is small, which indicates that the magnetic recording medium obtained by the present invention is strong and has excellent durability.
Claims (1)
のイソシアネート基および少なくとも１以上の炭素炭素
二重結合を有するポリイソシアネート化合物とを磁性粉
末の結合剤成分として含む塗膜を形成し、これに放射線
を照射して硬化された磁性層を設けたことを特徴とする
磁気記録媒体1. A coating film containing a radiation-curable resin and a polyisocyanate compound having at least one isocyanate group and at least one carbon-carbon double bond as a binder component of magnetic powder is formed on the substrate; A magnetic recording medium characterized by having a magnetic layer hardened by irradiating it with radiation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6019686A JPS62217420A (en) | 1986-03-18 | 1986-03-18 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6019686A JPS62217420A (en) | 1986-03-18 | 1986-03-18 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62217420A true JPS62217420A (en) | 1987-09-24 |
Family
ID=13135158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6019686A Pending JPS62217420A (en) | 1986-03-18 | 1986-03-18 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62217420A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010053242A (en) * | 2008-08-28 | 2010-03-11 | Sumitomo Osaka Cement Co Ltd | Solventless active energy ray-curable coating composition and method for producing the same and substrate with functional thin film |
-
1986
- 1986-03-18 JP JP6019686A patent/JPS62217420A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010053242A (en) * | 2008-08-28 | 2010-03-11 | Sumitomo Osaka Cement Co Ltd | Solventless active energy ray-curable coating composition and method for producing the same and substrate with functional thin film |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3357401B2 (en) | Magnetic recording material containing radiation-curing binder having .alpha.-methylstyrene unsaturated bond | |
| JPH0440780B2 (en) | ||
| JPS6366846B2 (en) | ||
| JPS62217420A (en) | Magnetic recording medium | |
| US4690870A (en) | Magnetic recording medium | |
| GB2130121A (en) | Magnetic recording medium and method for producing the same | |
| JPH0546016B2 (en) | ||
| JPH01143014A (en) | Magnetic recording medium | |
| JPS62214517A (en) | Magnetic recording medium | |
| JPH0416852B2 (en) | ||
| JPH0576092B2 (en) | ||
| JPH0467314A (en) | Magnetic recording medium | |
| JPS61160828A (en) | Magnetic recording medium | |
| JPS61188729A (en) | Magnetic recording medium | |
| JPS62154223A (en) | Magnetic recording medium | |
| JPH0778867B2 (en) | Magnetic recording medium | |
| JPS60121519A (en) | Magnetic recording medium | |
| JPS59191135A (en) | Magnetic recording medium and its production | |
| JPS60111328A (en) | Magnetic recording medium | |
| JPS6050619A (en) | Magnetic disc and its production | |
| JPH05143957A (en) | Magnetic recording medium | |
| JPS6168731A (en) | Production of magnetic recording medium | |
| JPS60263331A (en) | Production of magnetic recording medium | |
| JPS59162639A (en) | Magnetic recording medium | |
| JPS59162627A (en) | Magnetic recording medium |