JPH02273317A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH02273317A JPH02273317A JP9314889A JP9314889A JPH02273317A JP H02273317 A JPH02273317 A JP H02273317A JP 9314889 A JP9314889 A JP 9314889A JP 9314889 A JP9314889 A JP 9314889A JP H02273317 A JPH02273317 A JP H02273317A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- carbon atoms
- fatty acid
- branched
- magnetic layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 85
- -1 fatty acid ester Chemical class 0.000 claims abstract description 52
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 39
- 239000000194 fatty acid Substances 0.000 claims abstract description 39
- 229930195729 fatty acid Natural products 0.000 claims abstract description 39
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 20
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 17
- 239000010409 thin film Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 17
- 150000002430 hydrocarbons Chemical group 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 abstract description 14
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 abstract description 7
- 239000002253 acid Substances 0.000 abstract description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 abstract 3
- 239000010410 layer Substances 0.000 description 47
- 150000004665 fatty acids Chemical class 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000010954 inorganic particle Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 239000003973 paint Substances 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 5
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 5
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 5
- 239000005642 Oleic acid Substances 0.000 description 5
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 5
- 239000002216 antistatic agent Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 5
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 5
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 5
- XDOFQFKRPWOURC-UHFFFAOYSA-N 16-methylheptadecanoic acid Chemical group CC(C)CCCCCCCCCCCCCCC(O)=O XDOFQFKRPWOURC-UHFFFAOYSA-N 0.000 description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 239000001913 cellulose Chemical class 0.000 description 3
- 229920002678 cellulose Chemical class 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000000539 dimer Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Chemical group OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- OYHQOLUKZRVURQ-HZJYTTRNSA-N Linoleic acid Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC(O)=O OYHQOLUKZRVURQ-HZJYTTRNSA-N 0.000 description 2
- 239000005041 Mylar™ Substances 0.000 description 2
- 239000000020 Nitrocellulose Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical class C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 125000003158 alcohol group Chemical group 0.000 description 2
- 125000002947 alkylene group Chemical group 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 235000011187 glycerol Nutrition 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 235000020778 linoleic acid Nutrition 0.000 description 2
- OYHQOLUKZRVURQ-IXWMQOLASA-N linoleic acid Natural products CCCCC\C=C/C\C=C\CCCCCCCC(O)=O OYHQOLUKZRVURQ-IXWMQOLASA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920001220 nitrocellulos Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 235000003441 saturated fatty acids Nutrition 0.000 description 2
- 150000004671 saturated fatty acids Chemical class 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 description 1
- 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
- 229920002126 Acrylic acid copolymer Chemical class 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical class OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Chemical class OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical class CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical group 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical group 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001735 carboxylic acids Chemical group 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 150000002314 glycerols Chemical class 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000002391 heterocyclic compounds Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910001337 iron nitride Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical class OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- RMBHIVQOFNFWFU-UHFFFAOYSA-N n-[4-[2-(4-morpholin-4-ylanilino)pyrimidin-4-yl]phenyl]acetamide Chemical compound C1=CC(NC(=O)C)=CC=C1C1=CC=NC(NC=2C=CC(=CC=2)N2CCOCC2)=N1 RMBHIVQOFNFWFU-UHFFFAOYSA-N 0.000 description 1
- 125000005487 naphthalate group Chemical group 0.000 description 1
- 239000002736 nonionic surfactant Substances 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
- 235000019198 oils Nutrition 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical class [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
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- 125000005496 phosphonium group Chemical class 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920005670 poly(ethylene-vinyl chloride) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000007519 polyprotic acids Chemical class 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 235000017709 saponins Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 150000003437 strontium Chemical class 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical class NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium group Chemical class [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Chemical class OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は非磁性支持体上に強磁性粉末を結合剤に分散し
てなる磁性層を設けた磁気記録媒体に関し、特に広範囲
の温湿度条件において走行性耐久性に優れる磁気記録媒
体に関するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic recording medium having a magnetic layer formed by dispersing ferromagnetic powder in a binder on a non-magnetic support, and particularly relates to a magnetic recording medium that can be used under a wide range of temperature and humidity conditions. The present invention relates to a magnetic recording medium that has excellent running properties and durability.
磁気記録媒体においては、より高密度記録の要求が高ま
り、その一つの対応手段として磁性層の表面を平滑にす
ることが知られている。In magnetic recording media, there is an increasing demand for higher density recording, and it is known that one way to meet this demand is to make the surface of the magnetic layer smooth.
しかしながら磁性層の表面を平滑にすると磁気記録媒体
の走行中において磁性層と装置系との接触の摩擦係数が
増大する結果、短期間の使用で磁気記録媒体の磁性層が
損傷を受け、あるいは磁性層が剥離する傾向がある。However, when the surface of the magnetic layer is made smooth, the friction coefficient of the contact between the magnetic layer and the device system increases while the magnetic recording medium is running. As a result, the magnetic layer of the magnetic recording medium may be damaged or the magnetic layer may be damaged after a short period of use. Layers tend to peel off.
このような問題に対処するため、脂肪酸エステル(高級
脂肪酸エステルについては、特開昭50−22603号
公報、特開昭50−153905号公報、特公昭39−
28367号公報、特公昭41−18065号公報、不
飽和脂肪酸エステルについては、特開昭55−1396
37号公報、特開昭58−164025号公報に開示さ
れており、不飽和アルコールの脂肪酸エステルについて
は、特公昭47−12950号公報、分岐飽和脂肪酸の
エステルについては、特開昭58−218038号公報
に夫々開示されれている。)、シリコーン化合物(米国
特許第2.654.681号)、脂肪酸、炭化水素等の
潤滑剤が用いられてきた。In order to deal with such problems, fatty acid esters (for higher fatty acid esters, JP-A-50-22603, JP-A-50-153905, JP-A-Sho 39-
No. 28367, Japanese Patent Publication No. 18065/1983, and JP-A-55-1396 for unsaturated fatty acid esters.
37 and JP-A No. 58-164025, fatty acid esters of unsaturated alcohols are disclosed in JP-A-47-12950, and esters of branched saturated fatty acids are disclosed in JP-A-58-218038. Each is disclosed in the official gazette. ), silicone compounds (U.S. Pat. No. 2,654,681), fatty acids, hydrocarbons, and other lubricants have been used.
最近、VT[tやパーソナルコンピュータまたはワード
プロセッサ用といった民生用のフレキシブルディスクド
ライブ装置が普及し、−級化するにいたり、磁気記録媒
体の使用条件も低温下での使用、あるいは高温高湿下で
の使用等広きにわたるようになってきた。Recently, consumer flexible disk drive devices such as VT[t, personal computers, and word processors have become popular and are becoming more advanced. Its use has become widespread.
従って、磁気記録媒体は予測される種々の、条件下にお
いてもその走行耐久性が変動することがないような安定
したものでなければならないが従来知られているような
潤滑剤では十分ではなかった。Therefore, magnetic recording media must be stable so that their running durability does not change under various expected conditions, but conventionally known lubricants are not sufficient. .
また走行耐久性を向上させるための別の対策としては、
磁性層に研磨材(硬質粒子)を添加する方法が提案・実
施されているが、磁性層の走行面(人外を向上させろ目
的で磁性層に研磨材を添加する場合には、研磨材を相当
多量に添加しなければその添加効果が現れにくいという
問題があった。In addition, as another measure to improve running durability,
A method of adding abrasives (hard particles) to the magnetic layer has been proposed and implemented, but when adding an abrasive to the magnetic layer for the purpose of improving the running surface of the magnetic layer, There is a problem that the effect of addition is difficult to be seen unless it is added in a considerably large amount.
すなわち、電磁変換特性及びヘッド摩耗性を犠牲にする
ことなく走行耐久性を向上させることは究極的には離し
かった。That is, it was ultimately impossible to improve running durability without sacrificing electromagnetic conversion characteristics and head abrasion properties.
また、脂肪酸エステルを潤滑剤として、磁性層に用いた
場合、
(1)脂肪酸エステルの中では直鎖のものが最も潤滑性
にすぐれ、その中でも高分子量(500以上)のものが
よいが、常温で固体であるためにテープ表面に析出し、
ドロップアウト等の原因となること、(2)前記特開昭
58−218038号公報に開示された分岐脂肪酸エス
テルは、走行耐久性の向上に効果があるが低温(例えば
、5℃以下)では殆んど効果が無いこと、
等の問題だあり、磁気記録媒体の特に広範囲の温湿度条
件下で走行耐久性を維持することはできなかった。In addition, when fatty acid ester is used as a lubricant in the magnetic layer, (1) Among fatty acid esters, linear ones have the best lubricity, and among them, those with high molecular weight (500 or more) are good, but at room temperature Because it is a solid, it precipitates on the tape surface,
(2) The branched fatty acid ester disclosed in JP-A-58-218038 is effective in improving running durability, but it is hardly effective at low temperatures (e.g., below 5°C). However, it has been difficult to maintain running durability under a wide range of temperature and humidity conditions for magnetic recording media.
本発明は前記従来技術の問題点に鑑みなされたものであ
り、特に脂肪酸エステルの中では直鎮のものが最も潤滑
性にすぐれ、磁気記録媒体を提供することを目的として
いる。The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a magnetic recording medium in which, among fatty acid esters, a diluted fatty acid ester has the best lubricity.
前記本発明の目的は、非磁性支持体上に強磁性粉末を結
合剤中に分散してなる磁性層を設けた磁気記録媒体にお
いて、下記一般式で表わされる分岐脂肪酸エステル化合
物を該磁性層に含ませるかまたは該磁性層表面に存在さ
せるかまたは強磁性金属薄膜上に存在させることを特徴
とする磁気記録媒体によって達成される。The object of the present invention is to provide a magnetic recording medium having a magnetic layer formed by dispersing ferromagnetic powder in a binder on a non-magnetic support, in which a branched fatty acid ester compound represented by the following general formula is applied to the magnetic layer. This is achieved by a magnetic recording medium characterized by containing or existing on the surface of the magnetic layer, or existing on a ferromagnetic metal thin film.
R1−011−R2−CDOR
l13
但し、R1,炭素数1〜17の飽和直鎮−価炭化水素基
R2,炭素数1〜17の飽和直鎖二価炭化水素R:炭素
数4〜22の分岐または直鎮の一価炭化水素基
R1及びR2の炭素数の総和は10以上、25以下であ
る。R1-011-R2-CDOR l13 However, R1, a saturated straight chain divalent hydrocarbon group having 1 to 17 carbon atoms R2, a saturated straight chain divalent hydrocarbon group having 1 to 17 carbon atoms R: a branched chain having 4 to 22 carbon atoms Alternatively, the total number of carbon atoms in the monovalent hydrocarbon groups R1 and R2 is 10 or more and 25 or less.
本発明の磁気記録媒体においては、直鎮になるべく近い
構造、脂肪酸残基の主鎖に−CH31個の分岐を有して
おり、かつ直鎖又は分岐を有するアルコール残基を有す
る分岐脂肪酸エステルを潤滑剤に用いることにより、広
範囲の温湿度条件下で走行耐久性が大幅に向上している
ことが特徴である。In the magnetic recording medium of the present invention, a branched fatty acid ester having a structure as close as possible to a straight chain, having -CH31 branches in the main chain of the fatty acid residue, and having a straight chain or a branched alcohol residue is used. When used as a lubricant, it is characterized by significantly improved running durability under a wide range of temperature and humidity conditions.
本発明の前記特徴は、前記分岐脂肪酸エステル化合物の
構造的特徴によってもたらされる。The characteristics of the present invention are brought about by the structural characteristics of the branched fatty acid ester compound.
即ち、従来の分岐脂肪酸エステルは、脂肪酸の主鎖の炭
素原子に分岐を2つ以上有しているが、分岐が増えると
融点は低くなるが、低温での粘性が急激に高くなるため
摩擦係数が高くなり走行性が阻害されることを、本発明
者らは突き止め、本発明の目的を達成するためにさらに
検討した結果、分岐脂肪酸エステル化合物の脂肪酸残基
の分岐構造及び炭素数、アルコール残基の主として炭素
数を本発明のように特定することが有効であり、本発明
に至った。In other words, conventional branched fatty acid esters have two or more branches on the carbon atoms in the main chain of the fatty acid.As the number of branches increases, the melting point decreases, but the viscosity at low temperatures increases rapidly, resulting in a decrease in the coefficient of friction. The present inventors discovered that the runnability is inhibited by the increase in the number of carbon atoms in the fatty acid residue of the branched fatty acid ester compound. It is effective to specify the number of carbon atoms in the group as in the present invention, and the present invention has been achieved.
前記分岐脂肪酸エステルの酸残基は、−船釣にはメチル
分岐脂肪酸または異性化脂肪酸と呼ばれ、オレイン酸、
リノール酸などの不飽和脂肪酸からダイマー酸を製造す
る際の副生成物を精留して得られる。その酸は、J、A
m、Oil chem、Soc、 51,522.52
21974年に開示されてふり、下記一般式(1〉で表
される。The acid residues of the branched fatty acid ester are called methyl branched fatty acids or isomerized fatty acids in boat fishing, and include oleic acid,
It is obtained by rectifying a byproduct when producing dimer acid from unsaturated fatty acids such as linoleic acid. The acid is J, A
m, Oil chem, Soc, 51,522.52
It was first disclosed in 21974 and is expressed by the following general formula (1).
例えば、オレイン酸、リノール酸などの炭素数18の不
飽和脂肪酸からダイマー酸を製造する際に副生ずるメチ
ル分岐脂肪酸は、上記下記一般式(1)で示した場合、
n=7.m・7の中心位置にメチル分岐のあるイソステ
アリン酸が主体となる。すなわち、ダイマー酸原料の不
飽和脂肪酸の種類により、nmの変わったメチル分岐脂
肪酸かえられる。For example, the methyl branched fatty acid that is produced as a by-product when producing dimer acid from unsaturated fatty acids having 18 carbon atoms such as oleic acid and linoleic acid is represented by the following general formula (1):
n=7. The main component is isostearic acid with a methyl branch at the central position of m.7. That is, depending on the type of unsaturated fatty acid of the dimer acid raw material, a methyl branched fatty acid with a different nm can be changed.
具体的にはエメリー社(米国)のイソステアリン酸#8
71、同#875等である。Specifically, isostearic acid #8 from Emery (USA)
71, #875, etc.
本発明で用いる脂肪酸エステル化合物は、上記メチル分
岐脂肪酸とROH(Rは炭素数4〜22の分岐又は直鎖
の一価炭化水素基である。)のアルコールを通常の方法
にて脱水縮合して得ろことができ、一種又は二種以上を
組み合わせて上述の様に用いられる。The fatty acid ester compound used in the present invention is obtained by dehydrating and condensing the above-mentioned methyl branched fatty acid and ROH (R is a branched or straight-chain monovalent hydrocarbon group having 4 to 22 carbon atoms) using a conventional method. They can be used alone or in combination as described above.
本発明のエステル化合物のなかでも特に効果の大きいも
のは、分子量が430以上のものである。Among the ester compounds of the present invention, those with a molecular weight of 430 or more are particularly effective.
さらに分子量が500以上のものは苛酷条件で使用して
も、耐久性に極めて優れる。Furthermore, those having a molecular weight of 500 or more have extremely excellent durability even when used under severe conditions.
以下、本発明で用いる分岐脂肪酸エステルの具体例を例
示する。下記No、 1から10までの化合物は夫々独
立に用いても組み合わせて用いても良い。Specific examples of branched fatty acid esters used in the present invention are illustrated below. The compounds No. 1 to 10 below may be used independently or in combination.
匝
匝
匝
前記分岐脂肪酸エステル化合物の使用量は通常の強磁性
粉末を結合剤中に分散したいわゆる塗布型磁気記録媒体
の磁性層中に添加する場合、前記分岐脂肪酸エステル化
合物の分子量が430未満のときは強磁性粉末に対して
1〜25重量%、分子量430以上のものは1〜16重
量%が適当である。塗布型磁気記録媒体の磁性層の表面
にまたは金属薄膜型磁気記録層の表面にトップコートす
る場合は2〜50mg/m’が適当である。When adding the branched fatty acid ester compound to the magnetic layer of a so-called coated magnetic recording medium in which ordinary ferromagnetic powder is dispersed in a binder, the branched fatty acid ester compound has a molecular weight of less than 430. The appropriate amount is 1 to 25% by weight based on the ferromagnetic powder, and the appropriate amount is 1 to 16% by weight for those with a molecular weight of 430 or more. When top-coating the surface of the magnetic layer of a coated magnetic recording medium or the surface of a metal thin film magnetic recording layer, a suitable amount is 2 to 50 mg/m'.
本発明に用いられるトップコートの方法としては、前記
分岐脂肪酸エステル化合物を含有する材料を有機溶剤に
溶解して磁性層や記録層の表面に塗布あるいは噴霧した
のち乾燥する方法、有機溶剤に前記材料を溶解した溶液
に磁気記録媒体を浸漬して前記材料を磁性層や記録層表
面に吸着させる方法、ラングミュア−ブロジェット法な
どがある。The top coat method used in the present invention includes a method in which a material containing the branched fatty acid ester compound is dissolved in an organic solvent, coated or sprayed on the surface of the magnetic layer or recording layer, and then dried; There are methods such as the Langmuir-Blodgett method, a method in which the magnetic recording medium is immersed in a solution in which the material is adsorbed to the magnetic layer or the surface of the recording layer, and the Langmuir-Blodgett method.
使用量が前記の範囲をこえると表面に存在する前記分岐
脂肪酸エステル化合物の量が過剰になり、貼りつき等の
故障の原因になることがあるだけでなく、磁性層中に添
加した場合、バイングーを可塑化する作用により却って
耐久性が低下する等の問題がある。If the amount used exceeds the above range, the amount of the branched fatty acid ester compound present on the surface will be excessive, which may cause troubles such as sticking. However, due to the plasticizing action, there are problems such as a decrease in durability.
使用量が前記の範囲をしたまわると当然のことながら表
面の前記分岐脂肪酸エステル化合物の量が不十分となり
効果が得られない。If the amount used is less than the above range, the amount of the branched fatty acid ester compound on the surface will be insufficient, and no effect will be obtained.
本発明においては、一般の潤滑剤を混在させてもよい。In the present invention, a general lubricant may be mixed.
併用できる潤滑剤としては、飽和、不飽和の脂肪酸(ミ
リスチン酸、ステアリン酸、オレイン酸等)、その金属
塩およびそのアミド、本発明に該当しない脂肪酸エステ
ル(各種モノエステルをはじめソルビタン、グリセリン
等多価エステルの脂肪酸エステル、多塩基酸のエステル
化物等)、高級脂肪族アルコール、モノアルキルフォス
フェート、ジアルキルフォスフェート、トリアルキルフ
ォスフェート、パラフィン類、シリコーンオイル、動植
物油、鉱油、高級脂肪族アミン;グラファイト、シリカ
、二硫化モリブデン、二硫化タングステン等の無機微粉
末;ポリエチレン、ポリプロピレン、ポリ塩化ビニノペ
エチレンー塩化ビニル共重合体、ポリテトラフルオロエ
チレン等の樹脂微粉末;αオレフイン重合物;常温で液
体の不飽和脂肪族炭化水素、フルオロカーボン類等があ
げられる。Lubricants that can be used in combination include saturated and unsaturated fatty acids (myristic acid, stearic acid, oleic acid, etc.), their metal salts and their amides, fatty acid esters that do not fall under the scope of the present invention (including various monoesters, sorbitan, glycerin, etc.). fatty acid esters, polybasic acid esters, etc.), higher aliphatic alcohols, monoalkyl phosphates, dialkyl phosphates, trialkyl phosphates, paraffins, silicone oils, animal and vegetable oils, mineral oils, higher aliphatic amines; Fine inorganic powders such as graphite, silica, molybdenum disulfide, tungsten disulfide; fine resin powders such as polyethylene, polypropylene, polyvinyl chloride ethylene-vinyl chloride copolymer, polytetrafluoroethylene; α-olefin polymer; room temperature Examples include liquid unsaturated aliphatic hydrocarbons and fluorocarbons.
これらの混在潤滑剤の好ましい使用量は使用態様によっ
て様々だが、おおむね、本発明のエステル化合物の17
10〜2倍の使用量である。The preferable amount of these mixed lubricants to be used varies depending on the mode of use, but in general, the amount of the ester compound of the present invention
The usage amount is 10 to 2 times more.
塗布型磁気記録媒体の場合使用される強磁性粉末に特に
制限はない。強磁性合金粉末、T−Fe203、 Fe
3O4,Co変性酸化鉄、CrO□窒化鉄の地変性バリ
ウムフェライトおよび変性ストロンチウムフェライト等
を挙げることができる。There are no particular restrictions on the ferromagnetic powder used in the case of coating type magnetic recording media. Ferromagnetic alloy powder, T-Fe203, Fe
Examples include 3O4, Co-modified iron oxide, geo-modified barium ferrite of CrO□ iron nitride, and modified strontium ferrite.
前記強磁性粉末の形状に特に制限はないが通常は、針状
、粒状、サイコロ状、米粒状および板状のものなどが使
用される。この強磁性粉末の比表面積は、20m’/g
以上が電磁変換特性上好ましい。The shape of the ferromagnetic powder is not particularly limited, but needle-like, granular, dice-like, rice-grain-like, and plate-like shapes are usually used. The specific surface area of this ferromagnetic powder is 20 m'/g
The above is preferable in terms of electromagnetic conversion characteristics.
磁性層を形成する結合剤は通常の結合剤から選ぶことが
できる。結合剤の例としては、塩化ビニル・酢酸ビニル
共重合体、塩化ビニル・酢酸ビニルとビニルアルコール
、マレイン酸およヒ/マタはアクリル酸との共重合体、
塩化ビニル・塩化ビニリデン共重合体、塩化ビニル・ア
クリロニ)IJル共重合体、エチレン・酢酸ビニル共重
合体、ニトロセルロース樹脂などのセルロース誘導体、
アクリル樹脂、ポリビニルアセクール樹脂、ポリビニル
ブチラール樹脂、エポキシ樹脂、フェノキシ樹脂、ポリ
ウレタン樹脂、ポリカーボネートポリウレタン樹脂等を
挙げることができる。分散性・耐久性を更に高めるため
に以上列挙の結合剤分子中に、極性基(エポキシ基、C
o2H,011,NH,、SO3M。The binder forming the magnetic layer can be selected from conventional binders. Examples of binders include vinyl chloride/vinyl acetate copolymers, vinyl chloride/vinyl acetate and vinyl alcohol, maleic acid and acrylic acid copolymers,
Cellulose derivatives such as vinyl chloride/vinylidene chloride copolymer, vinyl chloride/acrylonite copolymer, ethylene/vinyl acetate copolymer, nitrocellulose resin,
Examples include acrylic resin, polyvinyl acecool resin, polyvinyl butyral resin, epoxy resin, phenoxy resin, polyurethane resin, polycarbonate polyurethane resin, and the like. In order to further improve dispersibility and durability, polar groups (epoxy groups, C
o2H,011,NH,,SO3M.
0303M、 PO3M2. OPO3M2. ただ
しMは水素、アルカリ金属またはアンモニウムであり、
一つの基の中に複数のMがあるときは互いに異なってい
てもよい)を導入したものが好ましい。極性基の含有量
としてはポリマー1グラム当り1O−6〜10−4当量
が好ましい範囲である。0303M, PO3M2. OPO3M2. However, M is hydrogen, alkali metal or ammonium,
When there are multiple M's in one group, they may be different from each other) are preferably introduced. The preferred content of polar groups is 10-6 to 10-4 equivalents per gram of polymer.
以上列挙の高分子結合剤は単独または数種混合で使用さ
れ、しばしばインシアネート系の公知の架橋剤を添加し
て硬化処理される。The polymeric binders listed above may be used alone or in combination, and are often cured by adding a known incyanate crosslinking agent.
また、アクリル酸エステル系のオリゴマーと、モノマー
を結合剤としてもちい、放射線照射によって硬化する結
合剤系にも、本発明の前記分岐脂肪酸エステル化合物は
適用できる。The branched fatty acid ester compound of the present invention can also be applied to a binder system that uses an acrylic acid ester oligomer and a monomer as a binder and is cured by radiation irradiation.
本発明の磁気記録媒体に使用される非磁性支持体の材質
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ナフタレートなどのポリエステル類;ポリエチレ
ン、ポリプロピレンなどのポリオレフィン類、セルロー
ストリアセレートなど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の樹脂を用い
ることができ、必要に応じアルミニウム等の金属でメタ
ライズしてあってもよい。Materials for the non-magnetic support used in the magnetic recording medium of the present invention include polyesters such as polyethylene terephthalate and polyethylene 2,6 naphthalate; polyolefins such as polyethylene and polypropylene; cellulose derivatives such as cellulose triacerate; and polycarbonate. , polyimide, polyamideimide, or the like, and may be metalized with a metal such as aluminum if necessary.
前記非磁性支持体の厚みは3〜100 μ、磁気テープ
としては好ましくは3〜20μ、磁気ディスクとしては
20〜100 μが通常使用される範囲である本発明の
磁気記録媒体の磁性層中の全結合剤の含有量は、通常は
強磁性粉末100重量部に対して10〜100重量部で
あり、好ましくは20〜40部であ本発明の磁気記録媒
体の磁性層には、さらにモース硬度5以上の無機質粒子
を含有することが好ましい。The thickness of the non-magnetic support is 3 to 100 μm, preferably 3 to 20 μm for a magnetic tape, and 20 to 100 μm for a magnetic disk, in the magnetic layer of the magnetic recording medium of the present invention. The content of the total binder is usually 10 to 100 parts by weight, preferably 20 to 40 parts by weight, per 100 parts by weight of the ferromagnetic powder. It is preferable to contain 5 or more inorganic particles.
使用される無機質粒子は、モース硬度が5以上であれば
特に制限はない。モース硬度が5以上の無機質粒子の例
としては、A!203 (モース硬度9)110(同
6)、 TlO2(同6.5)、 Si[12(同7)
、 Sn[]□(同6.5)、 Cr2O,(同9)、
およαFe2L (同5.5)を挙げることができ、こ
れらを単独あるいは混合して用いることができる
とくに好ましいのはモース硬度が8以上の無機質粒子で
ある。モース硬度が5よりも低い無機質粒子を用いた場
合には、磁性層から無機質粒子が脱落しやすく、またヘ
ッドの研磨作用も殆どないため、ヘッド目詰まりを発生
しやすく、また走行耐久性も乏しくなる。The inorganic particles used are not particularly limited as long as they have a Mohs hardness of 5 or more. Examples of inorganic particles with a Mohs hardness of 5 or more include A! 203 (Mohs hardness 9) 110 (6), TlO2 (6.5), Si[12 (7)
, Sn[]□ (6.5), Cr2O, (9),
and αFe2L (5.5), and inorganic particles having a Mohs hardness of 8 or more are particularly preferred, and these can be used alone or in combination. When inorganic particles with a Mohs hardness lower than 5 are used, the inorganic particles tend to fall off from the magnetic layer and have almost no abrasive action on the head, resulting in head clogging and poor running durability. Become.
無機質粒子の含有量は、通常、強磁性粉末100重量部
に対して0.1〜20重量部の範囲であり、好ましくは
1〜10重量部の範囲である。The content of the inorganic particles is usually in the range of 0.1 to 20 parts by weight, preferably in the range of 1 to 10 parts by weight, based on 100 parts by weight of the ferromagnetic powder.
また磁性層には上記の無機質粒子以外にも、カーボンブ
ラック(特に、平均粒径が10〜300nm(ナノメー
トル; 10−’m)のもの)などを含有させることが
望ましい。In addition to the above-mentioned inorganic particles, the magnetic layer preferably contains carbon black (particularly one having an average particle size of 10 to 300 nm (nanometers; 10-'m)).
つぎに本発明の磁気記録媒体を製造する方法の例を述べ
る。Next, an example of a method for manufacturing the magnetic recording medium of the present invention will be described.
まず、強磁性粉末と結合剤、前記のエステル化合物、そ
して必要に応じて、他の充填剤、添加剤などを溶剤と混
練し、磁性塗料を調製する。混練の際に使用する溶剤と
しては、磁性塗料の調製に通常使用されている溶剤を使
用することができる。First, a magnetic paint is prepared by kneading ferromagnetic powder, a binder, the above-mentioned ester compound, and, if necessary, other fillers, additives, etc. with a solvent. As the solvent used during kneading, solvents commonly used for preparing magnetic paints can be used.
混練の方法にも特に制限はなく、また各成分の添加順序
などは適宜設定することができる。There is no particular restriction on the kneading method, and the order of addition of each component can be set as appropriate.
磁性塗料を調製する際には、分散剤、帯電防止剤、潤滑
剤等の公知の添加剤を併せて使用することもできる。When preparing a magnetic paint, known additives such as dispersants, antistatic agents, lubricants, etc. can also be used.
分散剤の例としては、炭素数12〜22の脂肪酸、その
塩およびそれら化合物の水素の一部あるいは全部をフッ
素原子で置換した化合物、上記の脂肪酸のアミド、脂肪
族アミン、高級アルコーノペポリアルキレンオキサイド
アルキル燐酸エステル、アルキル燐酸エステノペアルキ
ルホウ酸エステノペサルコシネート類、アルキルエーテ
ルエステル類、トリアルキルポリオレフィン、オキシ第
4級アンモニウム塩およびレシチンなどの公知の分散剤
を挙げることができる。Examples of dispersants include fatty acids having 12 to 22 carbon atoms, salts thereof, and compounds in which part or all of the hydrogen atoms of these compounds are replaced with fluorine atoms, amides of the above fatty acids, aliphatic amines, and higher alkone polyesters. Known dispersants such as alkylene oxide alkyl phosphate esters, alkyl phosphate esters, alkyl phosphate esters, alkyl ether esters, trialkyl polyolefins, oxyquaternary ammonium salts, and lecithin can be mentioned. .
分散剤を使用する場合は、通常は使用する強磁性粉末1
00重量部に対し、0.1〜10重量部の範囲で使用さ
れる。When using a dispersant, the ferromagnetic powder 1 usually used is
It is used in a range of 0.1 to 10 parts by weight per 00 parts by weight.
帯電防止剤の例としては、カーボンブラック、カーボン
ブラックグラフトポリマーなどの導電性微粉末;サポニ
ンなどの天然界面活性剤;アルキレンオキサイド系、グ
リセリン系およびグリシドール系などのノニオン系界面
活性剤;高級アルキルアミン類、第4級アンモニウム塩
類、ピリジンその他の複素環化合物の塩類、ホスホニウ
ムまたはスルホニウム類などのカチオン性界面活性剤カ
ルボン酸、燐酸、硫酸エステル基、燐酸エステル基等の
酸性基を含むアニオン性界面活性剤;アミノ酸類、アミ
ノスルホン酸類、アミノアルコールの硫酸または燐酸エ
ステル類等の両性界面活性剤等を挙げることができる。Examples of antistatic agents include conductive fine powders such as carbon black and carbon black graft polymers; natural surfactants such as saponins; nonionic surfactants such as alkylene oxides, glycerins, and glycidols; higher alkyl amines. Cationic surfactants such as quaternary ammonium salts, salts of pyridine and other heterocyclic compounds, phosphoniums or sulfoniums Anionic surfactants containing acidic groups such as carboxylic acid, phosphoric acid, sulfuric acid ester groups, and phosphoric ester groups Agents: Examples include amphoteric surfactants such as amino acids, aminosulfonic acids, sulfuric acid or phosphoric acid esters of amino alcohols, and the like.
帯電防止剤として上記の導電性微粉末を使用する場合に
は、例えば強磁性粉末100重量部に対し0.1〜10
重量部の範囲で使用され、界面活性剤を使用する場合に
も同様に0.12〜10重量部の範囲で使用される。When using the above conductive fine powder as an antistatic agent, for example, 0.1 to 10 parts by weight per 100 parts by weight of ferromagnetic powder.
It is used in a range of parts by weight, and when a surfactant is used, it is also used in a range of 0.12 to 10 parts by weight.
なお、上述した分散剤、帯電防止剤、潤滑剤などの添加
剤は、厳密に上述した作用効果のみを有するものである
との限定の下に記載したものではなく、例えば、分散剤
が潤滑剤あるいは帯電防止剤として作用することも有り
うる。従って、上記分類により例示した化合物などの効
果作用が、上記分類に記載された事項に限定されないこ
とは勿論であり、また複数の作用効果を奏する物質を使
用する場合には、添加量は、その作用効果を考慮して決
定することが好ましい。Note that the above-mentioned additives such as dispersants, antistatic agents, and lubricants are not strictly limited to having only the above-mentioned effects; for example, if the dispersant is a lubricant, Alternatively, it may act as an antistatic agent. Therefore, it goes without saying that the effects of the compounds exemplified by the above classifications are not limited to those listed in the above classifications, and when using a substance that has multiple effects, the amount added should be It is preferable to decide in consideration of the action and effect.
このようにして調製された磁性塗料は前述の非磁性支持
体上に塗布される。塗布は、前記非磁性支持体上に直接
行なうことも可能であるが、また、接着剤層などの中間
層を介して非磁性支持体上に塗布することもできる。こ
こでいう中間層とは接着剤単独の層または結合剤中にカ
ーボン等の非磁性微粒子を分散してなる複合膜層等であ
る。The magnetic paint thus prepared is applied onto the non-magnetic support described above. Coating can be performed directly onto the non-magnetic support, but it can also be applied onto the non-magnetic support via an intermediate layer such as an adhesive layer. The intermediate layer herein refers to a layer of adhesive alone or a composite film layer formed by dispersing non-magnetic fine particles such as carbon in a binder.
カーボンを含有する中間層は結合剤として磁性層に用い
られる種々の結合剤のなかから任意に選ぶことができる
。カーボンの粒径は10〜50nm (ナノメートル;
10−9m)のものが好ましく、バインダ:カーボン
は重量比にして100:1[1から100:150が好
ましい。中間層の厚みは単なる接着剤層の場合0.1〜
2μ、非磁性粉体を含む複合層の場合0.5〜4μが好
ましい。The carbon-containing intermediate layer can be arbitrarily selected as a binder from among various binders used in magnetic layers. The particle size of carbon is 10 to 50 nm (nanometers).
10-9m) is preferable, and the binder:carbon weight ratio is preferably 100:1 [1 to 100:150 is preferable. The thickness of the intermediate layer is 0.1 to 0.1 when it is just an adhesive layer.
2μ, preferably 0.5 to 4μ in the case of a composite layer containing non-magnetic powder.
中間層にはこのほか磁性層に用いている潤滑剤と同じま
たは異なる潤滑剤を添加してもよい。In addition, a lubricant that is the same as or different from the lubricant used in the magnetic layer may be added to the intermediate layer.
上記の強磁性粉末と結合剤の分散方法および支持体への
塗布方法などの詳細は特開昭54−46011号および
同54−21805号等の各公報に記載されている。Details of the method of dispersing the above-mentioned ferromagnetic powder and binder and the method of coating it on a support are described in Japanese Patent Laid-Open Publications No. 54-46011 and No. 54-21805.
このようにして塗布される磁性層の厚さは、乾燥後の厚
さで一般には約0.5〜10μの範囲、通常は0,7〜
6.0 μの範囲になるよう塗布される。The thickness of the magnetic layer applied in this way is generally in the range of about 0.5 to 10 μm after drying, usually 0.7 to 10 μm.
It is applied to a range of 6.0μ.
非磁性支持体上に塗布された磁性層は磁気記録媒体がテ
ープ状で使用される場合通常、磁性層中の強磁性粉末を
配向させる処理、即ち磁場配向処理を施したあと、乾燥
される。また逆にディスク状媒体の場合は磁気特性の異
方性をとりのぞくために、磁場による無配向処理が施さ
れる。こののち必要により表面平滑化処理が施される。When a magnetic recording medium is used in the form of a tape, the magnetic layer coated on the non-magnetic support is usually subjected to a treatment for orienting the ferromagnetic powder in the magnetic layer, that is, a magnetic field orientation treatment, and then dried. On the other hand, in the case of a disk-shaped medium, non-orientation treatment is performed using a magnetic field in order to eliminate anisotropy in magnetic properties. Thereafter, surface smoothing treatment is performed if necessary.
炭素数及び分岐位置を特定したメチル分岐脂肪酸と炭素
数が特定された分岐又は直鎖のアルコールとから得られ
た分岐脂肪酸エステルを潤滑剤として使用することによ
り、電磁変換特性を低下させることなく、特に低温度条
件で改良が著しい広範囲の温湿度条件下で走行耐久性の
優れた磁気記録媒体が得られる。By using a branched fatty acid ester obtained from a methyl branched fatty acid whose carbon number and branching position are specified and a branched or straight chain alcohol whose carbon number is specified as a lubricant, the electromagnetic conversion characteristics are not deteriorated. A magnetic recording medium with excellent running durability under a wide range of temperature and humidity conditions, which is particularly improved under low temperature conditions, can be obtained.
次に実施例をもって本発明の新規な効果を具体的に説明
する。尚、本発明はこれらに限定されるものではない。Next, the novel effects of the present invention will be specifically explained using examples. Note that the present invention is not limited to these.
なお、実施例中の「部」との表示は「重量部」を示すも
のとする。Note that "parts" in the examples indicate "parts by weight."
実施例1゜
非磁性支持体として表面粗さRa=0.028μ、厚み
75μのポリエチレンテレフタレートフィルムの両面に
下記の如く調製した塗布液■を塗布して厚さ1.8μの
非磁性層を形成し、さらにその上に同じく調製した塗布
液■を塗布して厚さ0.9μの磁性層を形成した。Example 1: A nonmagnetic layer with a thickness of 1.8μ was formed by applying the coating solution (1) prepared as below on both sides of a polyethylene terephthalate film with a surface roughness Ra of 0.028μ and a thickness of 75μ as a nonmagnetic support. Then, a coating solution (2) prepared in the same manner was applied thereon to form a magnetic layer having a thickness of 0.9 μm.
■非磁性層(中間層)形成用塗布液の調製組成
ニトロセルロース 12部オレ
イン酸
1部
上記組成の成分をボールミルに入れ、十分混合して粘度
lOボイズ(25℃)の塗料を調製し、ここでポリイソ
シアネート(東日本塗料部ウレコートB マイラー用#
1クリアー)7部を加えて十分混合し、非磁性層(中間
層)形成用塗布液とした。■ Preparation of coating solution for forming non-magnetic layer (intermediate layer) Composition Nitrocellulose 12 parts Oleic acid 1 part Place the above ingredients in a ball mill, mix thoroughly to prepare a paint with a viscosity of 1O voids (25°C). Polyisocyanate (East Japan Paint Department Urecoat B for Mylar #
1 clear) was added and thoroughly mixed to obtain a coating solution for forming a nonmagnetic layer (intermediate layer).
■磁性層形成用塗布液の調製
組成
Cr203(研磨剤)
5部
したのち、直径3.5インチの円板状フレキシブルディ
スクに加工し、試料を作成した。(2) Preparation of Coating Solution for Magnetic Layer Formation Composition Cr203 (abrasive) 5 parts were prepared, and then processed into a disk-shaped flexible disk with a diameter of 3.5 inches to prepare a sample.
試作した各試料について次に示す条件で測定して走行耐
久性を評価し出力を測定した。Each prototype sample was measured under the following conditions to evaluate running durability and measure output.
試作したサンプルおよびその評価結果を第1表に示す。Table 1 shows the prototype samples and their evaluation results.
エステル化合物 〔第1表に記載〕
オレイン酸 1部ミリス
チン酸変性シリコーン 1.5部上記組成の諸
成分をボールミルにいれ、十分攪拌し、均一に分散させ
、ここでポリイソシアネート (東日本塗料製 ウレコ
ートB マイラー用#1クリアー)を7部加えて十分混
合し、磁性層形成用塗料とした。Ester compound [Listed in Table 1] Oleic acid 1 part Myristic acid-modified silicone 1.5 parts The components of the above composition were placed in a ball mill, thoroughly stirred, and uniformly dispersed. 7 parts of #1 Clear for Mylar were added and thoroughly mixed to prepare a paint for forming a magnetic layer.
上記のごとく塗布した被塗物をカレンダー(表面艶出し
機)により磁性層表面の平滑化処理を施上記フローを1
サイクルとした温湿度条件のサーモサイクル環境下及び
5℃50%、60℃20%の一定環境下でそれぞれ、3
.5インチのフロッピーデイスフドライブ(300rp
m>を用いて連続走行させ、出力が初期値に対して80
%以下に低下するまでの走行パス回数で表わした。The surface of the magnetic layer is smoothed using a calendar (surface polishing machine) on the coated object as described above.
Under a thermocycle environment with cycled temperature and humidity conditions and under a constant environment of 50% 50% and 20% 60°C, respectively.
.. 5 inch floppy disk drive (300 rpm)
m> and run continuously, and the output is 80% of the initial value.
It is expressed as the number of driving passes until it drops below %.
出力
3.5インチのフロッピーディスクドライブ<SONY
MPF72W)を用いて250kHzの信号をトラック
位置79に記録した時の再生出力を標準ディスクを10
0%としたときの相対値で表わした。3.5 inch output floppy disk drive <SONY
The playback output when a 250kHz signal is recorded at track position 79 using a standard disc (MPF72W) is 10
It is expressed as a relative value when it is set to 0%.
第1表に示した測定結果から明らかなように、本発明の
磁気記録媒体、実施例−1〜7は走行耐久性、出力がと
もに優れていることが分かった。As is clear from the measurement results shown in Table 1, the magnetic recording media of the present invention, Examples 1 to 7, were found to be excellent in both running durability and output.
それに対し、従来の磁気記録媒体(比較例−1〜5)で
は、特に、低温度での走行耐久性が充分でないことが分
かった。In contrast, it was found that the conventional magnetic recording media (Comparative Examples-1 to 5) did not have sufficient running durability, especially at low temperatures.
実施例2
実施例1の磁性塗布液の調整で、エステル化合物を加え
ない他は実施例1と同様にして試料を作成し、表面平滑
処理を行った後に、ヘキサンに1%溶解したエステル化
合物をバーコーターを用いてトップコートした。乾燥後
、3.5 インチフレキシブルディスクに加工して、実
施例1と同様な評価を行った。得られた結果を第2表に
示した。Example 2 A sample was prepared in the same manner as in Example 1 except that the ester compound was not added in the preparation of the magnetic coating liquid in Example 1. After surface smoothing treatment, an ester compound dissolved at 1% in hexane was added. A top coat was applied using a bar coater. After drying, it was processed into a 3.5 inch flexible disk and evaluated in the same manner as in Example 1. The results obtained are shown in Table 2.
上記の結果からも明らかなように、本発明による分岐脂
肪酸エステルを用いた磁気記録媒体は広範な温度範囲で
高走行耐久性を示すことがわかる。As is clear from the above results, it can be seen that the magnetic recording medium using the branched fatty acid ester according to the present invention exhibits high running durability over a wide temperature range.
Claims (1)
磁性層または強磁性金属薄膜を設けた磁気記録媒体にお
いて、下記一般式で表わされる分岐脂肪酸エステル化合
物を該磁性層に含ませるかまたは該磁性層表面に存在さ
せるかまたは強磁性金属薄膜上に存在させることを特徴
とする磁気記録媒体。 ▲数式、化学式、表等があります▼ 但し、R^1:炭素数1〜17の飽和直鎖一価炭化水素
基、 R^2:炭素数1〜17の飽和直鎖二価炭化水素基、 R:炭素数4〜22の分岐または直鎖の一価炭化水素基
、 また、R^1及びR^2の炭素数の総和は10以上、2
5以下である。[Scope of Claims] A magnetic recording medium comprising a magnetic layer or a ferromagnetic metal thin film formed by dispersing ferromagnetic powder in a binder on a non-magnetic support, in which a branched fatty acid ester compound represented by the following general formula is used. A magnetic recording medium characterized in that it is contained in the magnetic layer, is present on the surface of the magnetic layer, or is present on a ferromagnetic metal thin film. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ However, R^1: A saturated linear monovalent hydrocarbon group having 1 to 17 carbon atoms, R^2: A saturated linear divalent hydrocarbon group having 1 to 17 carbon atoms, R: Branched or straight-chain monovalent hydrocarbon group having 4 to 22 carbon atoms, and the total number of carbon atoms of R^1 and R^2 is 10 or more, 2
5 or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9314889A JPH02273317A (en) | 1989-04-14 | 1989-04-14 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9314889A JPH02273317A (en) | 1989-04-14 | 1989-04-14 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02273317A true JPH02273317A (en) | 1990-11-07 |
Family
ID=14074450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9314889A Pending JPH02273317A (en) | 1989-04-14 | 1989-04-14 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02273317A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62189625A (en) * | 1986-02-17 | 1987-08-19 | Kao Corp | Magnetic recording medium |
JPH0194530A (en) * | 1987-10-06 | 1989-04-13 | Hitachi Maxell Ltd | Magnetic recording medium |
JPH0224825A (en) * | 1988-07-13 | 1990-01-26 | Hitachi Maxell Ltd | Magnetic recording medium |
-
1989
- 1989-04-14 JP JP9314889A patent/JPH02273317A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62189625A (en) * | 1986-02-17 | 1987-08-19 | Kao Corp | Magnetic recording medium |
JPH0194530A (en) * | 1987-10-06 | 1989-04-13 | Hitachi Maxell Ltd | Magnetic recording medium |
JPH0224825A (en) * | 1988-07-13 | 1990-01-26 | Hitachi Maxell Ltd | Magnetic recording medium |
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