JPS63113931A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS63113931A JPS63113931A JP25846786A JP25846786A JPS63113931A JP S63113931 A JPS63113931 A JP S63113931A JP 25846786 A JP25846786 A JP 25846786A JP 25846786 A JP25846786 A JP 25846786A JP S63113931 A JPS63113931 A JP S63113931A
- Authority
- JP
- Japan
- Prior art keywords
- film
- young
- magnetic recording
- recording medium
- longitudinal direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 62
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical group C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 238000002425 crystallisation Methods 0.000 abstract 2
- 230000008025 crystallization Effects 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 238000000576 coating method Methods 0.000 description 9
- 230000005294 ferromagnetic effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 230000003746 surface roughness Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- -1 monohydrogen salts Chemical class 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229910052788 barium Inorganic materials 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 229920005596 polymer binder Polymers 0.000 description 4
- 239000002491 polymer binding agent Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000035882 stress Effects 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 150000004677 hydrates Chemical class 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- QIVUCLWGARAQIO-OLIXTKCUSA-N (3s)-n-[(3s,5s,6r)-6-methyl-2-oxo-1-(2,2,2-trifluoroethyl)-5-(2,3,6-trifluorophenyl)piperidin-3-yl]-2-oxospiro[1h-pyrrolo[2,3-b]pyridine-3,6'-5,7-dihydrocyclopenta[b]pyridine]-3'-carboxamide Chemical compound C1([C@H]2[C@H](N(C(=O)[C@@H](NC(=O)C=3C=C4C[C@]5(CC4=NC=3)C3=CC=CN=C3NC5=O)C2)CC(F)(F)F)C)=C(F)C=CC(F)=C1F QIVUCLWGARAQIO-OLIXTKCUSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 241001474374 Blennius Species 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 235000010582 Pisum sativum Nutrition 0.000 description 1
- 240000004713 Pisum sativum Species 0.000 description 1
- 241001422033 Thestylus Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical class [Ti] RTAQQCXQSZGOHL-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
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229940081735 acetylcellulose Drugs 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007754 air knife coating Methods 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
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 150000001558 benzoic acid derivatives Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229940031993 lithium benzoate Drugs 0.000 description 1
- LDJNSLOKTFFLSL-UHFFFAOYSA-M lithium;benzoate Chemical compound [Li+].[O-]C(=O)C1=CC=CC=C1 LDJNSLOKTFFLSL-UHFFFAOYSA-M 0.000 description 1
- SNKMVYBWZDHJHE-UHFFFAOYSA-M lithium;dihydrogen phosphate Chemical compound [Li+].OP(O)([O-])=O SNKMVYBWZDHJHE-UHFFFAOYSA-M 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 230000003287 optical effect Effects 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
- 239000008188 pellet Substances 0.000 description 1
- MOQRZWSWPNIGMP-UHFFFAOYSA-N pentyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCC MOQRZWSWPNIGMP-UHFFFAOYSA-N 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 235000011008 sodium phosphates Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- TWQULNDIKKJZPH-UHFFFAOYSA-K trilithium;phosphate Chemical compound [Li+].[Li+].[Li+].[O-]P([O-])([O-])=O TWQULNDIKKJZPH-UHFFFAOYSA-K 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000005019 vapor deposition process Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は磁気記録媒体に関し、更に詳しくは高密度長時
間記録可能な磁気記録媒体殊にＶＴＲ用磁気記録媒体に
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 capable of high-density, long-time recording, particularly a magnetic recording medium for VTRs.
［従来技術］
磁気記録媒体として、従来から、二軸配向ポリエチレン
テレフタレートフィルムを基体とし、その少なくとも一
表面に主としてγ−酸化鉄と高分子バインダーよりなる
磁性層を形成した磁気記録媒体が用いられている。また
、近年、該基体の少なくとも一表面にコバルト、ニッケ
ルなどの強磁性金属よりなる磁性層を形成した磁気記録
媒体が注目され、一部には用いられている。[Prior Art] Conventionally, magnetic recording media have been used that have a biaxially oriented polyethylene terephthalate film as a base and have a magnetic layer mainly composed of γ-iron oxide and a polymer binder formed on at least one surface thereof. There is. Further, in recent years, magnetic recording media in which a magnetic layer made of a ferromagnetic metal such as cobalt or nickel is formed on at least one surface of the substrate have attracted attention and are used in some cases.
これら磁気記録媒体については、近年、高密度記録化、
長時間記録化等の要望が高まり、特に家庭用ＶＴＲはそ
の小型化に伴い、テープ幅が１２．７姻から８Ｍと狭く
なったり、またカセットも小型化してきており、この要
望が強い。これら特性の賦与にはベースフィルムを薄ク
シ、また磁性層を薄くする必要があるが、従来のベース
フィルムは、その厚みを薄くすると種々の問題が発生し
、これら特性の賦与に限界がある。例えば、ベースフィ
ルムを薄くすると、（１）磁性塗料の塗布、或は強磁性
金属の物理蒸着工程でのフィルムの安定性が低下し、そ
の結果磁性層を薄くかつ均一に形成するのが難しく、ま
た（２）磁気記録媒体の走行性、耐久性等が不良となる
。Regarding these magnetic recording media, in recent years, high-density recording,
There is a growing demand for long-duration recording, especially as household VTRs become smaller, tape widths have become narrower from 12.7 mm to 8 MB, and cassettes are also becoming smaller. To impart these properties, it is necessary to make the base film thinner and to make the magnetic layer thinner, but when the thickness of conventional base films is made thinner, various problems occur, and there is a limit to the imparting of these properties. For example, if the base film is thinned, (1) the stability of the film during the application of magnetic paint or the physical vapor deposition process of ferromagnetic metal decreases, and as a result, it is difficult to form a thin and uniform magnetic layer; Furthermore, (2) the running properties, durability, etc. of the magnetic recording medium become poor.
［発明の目的］
本発明の目的は、かかる問題点を改善し、電磁変換特性
がよく、しかもテープの走行性や耐久性が極めて、良好
な磁気記録媒体、殊に高密度長時間記録可能なＶＴＲ用
磁気記録媒体を提供することにある。[Object of the Invention] The object of the present invention is to improve the above-mentioned problems and to provide a magnetic recording medium that has good electromagnetic characteristics, excellent tape runnability and durability, and is particularly capable of high-density, long-term recording. An object of the present invention is to provide a magnetic recording medium for a VTR.
［発明の構成・効果］
本発明の目的は、本発明によれば、ベースフィルムの少
なくとも一表面上に磁性層を設けた磁気記録媒体におい
て、該ベースフィルムが、長手方向の５％伸長時応力が
１５に９／ｍｔＡ以上であり、長手方向のヤング率が６
５０Ｋｙ／７以上で幅方向のヤング率がｓｎｏｗｇ／−
以上でかつこれらヤング率の和が１４００〜２１００Ｋ
ｇ／−の範囲にあり、１５０℃における長手方向の熱収
縮率が４％以上で幅方向の熱収縮率が８％以下であり、
かつ結晶化度が５０％以下である二軸配向ポリエチレン
−２，６−ナフタリンジカルボキシレートフィルムであ
ることを特徴とする磁気記録媒体によって達成される。[Structures and Effects of the Invention] According to the present invention, in a magnetic recording medium in which a magnetic layer is provided on at least one surface of a base film, the base film has a stress stress when elongated by 5% in the longitudinal direction. is 15 to 9/mtA or more, and the Young's modulus in the longitudinal direction is 6
Young's modulus in the width direction is snowg/- at 50Ky/7 or more
above and the sum of these Young's moduli is 1400 to 2100K
g/-, the heat shrinkage rate in the longitudinal direction at 150°C is 4% or more and the heat shrinkage rate in the width direction is 8% or less,
This is achieved by a magnetic recording medium characterized by being a biaxially oriented polyethylene-2,6-naphthalene dicarboxylate film having a crystallinity of 50% or less.
本発明においてベースフィルムを構成するポリマーは、
ポリエチレン−２，６−ナフタリンジカルボキシレート
である。このポリエチレン−２，６−ナフタリンジカル
ボキシレートは小割合の第三成分が共重合されていても
よく、また小割合の他のポリマーが混合されていもよい
。かかるポリエチレン−２，６−ナフタリンジカルボキ
シレートは公知の方法で製造できる。The polymer constituting the base film in the present invention is
It is polyethylene-2,6-naphthalene dicarboxylate. This polyethylene-2,6-naphthalene dicarboxylate may be copolymerized with a small proportion of a third component, or may be mixed with a small proportion of another polymer. Such polyethylene-2,6-naphthalene dicarboxylate can be produced by a known method.
本発明において、ベースフィルムは、その長手方向く長
さ方向）の５％伸長時応力（以下、Ｆ−５値と略称する
）が１５Ｋｇ／ｓ以上である必要がある。このＦ−５値
が低いと、テープ走行系でトラブルを起し、繰返し走行
に耐えられなくなる。更に、ベースフィルムは長手方向
のヤング率が６５０Ｋｙ／ｒｔｖＡ以上、好ましくは６
５０〜１５００Ｋｆｆ ／ ｍｔＡで、幅方向（横方向
）のヤング率が５００Ｋｙ／ｍＡ以上、好ましくは５０
０〜１２００に９／−で、かつこれらヤング率の和（長
手方向のヤング率と幅方向のヤング率の和）が１４００
〜２１００Ｋｇ／ｍｆｆ１の範囲にある必要がある。か
かる高ヤング率が要求される理由は、フィルムが薄くな
るに伴い、スティフネス（腰の強さ）が低下する為、ビ
デオテープの場合は回転シリンダーヘッドとテープの当
りが充分でなく、電磁変換特性が低下する為である。長
手方向のヤング率が６５０Ｋｙ／ ｍｒ４未満の場合、
電磁変換特性が充分でなく、またこの長手方向のヤング
率が高すぎるとテープの引裂けが起きるので好ましくな
い。また、この幅方向のヤング率が５００Ｋｙ／−未Ｉ
Ｔ４の場合、長手方向のヤング率が高くても電磁変換特
性が充分でなく、またこの幅方向のヤング率が高すぎる
とテープの引裂けが起るので好ましくない。更にまた、
これらヤング率の和が１５００Ｋｇ／−未満の場合、電
磁変換特性が充分でなく、またこのヤング率の和が２１
００Ｋｙ／ ｒｔｙＡを超えると破断なく二軸配向フィ
ルムを得ることが困難となる。In the present invention, the base film must have a stress at 5% elongation (hereinafter abbreviated as F-5 value) of 15 Kg/s or more in the longitudinal direction. If this F-5 value is low, trouble will occur in the tape running system and the tape will not be able to withstand repeated running. Furthermore, the base film has a Young's modulus in the longitudinal direction of 650 Ky/rtvA or more, preferably 6
50 to 1500 Kff/mtA, and Young's modulus in the width direction (lateral direction) is 500 Ky/mA or more, preferably 50
9/- from 0 to 1200, and the sum of these Young's moduli (the sum of the Young's modulus in the longitudinal direction and the Young's modulus in the width direction) is 1400
It needs to be in the range of ~2100Kg/mff1. The reason why such a high Young's modulus is required is that as the film becomes thinner, its stiffness decreases, and in the case of video tapes, the contact between the rotating cylinder head and the tape is not sufficient, and the electromagnetic conversion characteristics This is because it decreases. If the Young's modulus in the longitudinal direction is less than 650 Ky/mr4,
If the electromagnetic conversion characteristics are insufficient and the Young's modulus in the longitudinal direction is too high, the tape may tear, which is not preferable. In addition, the Young's modulus in the width direction is 500 Ky/- less than I
In the case of T4, even if the Young's modulus in the longitudinal direction is high, the electromagnetic conversion characteristics are not sufficient, and if the Young's modulus in the width direction is too high, tearing of the tape may occur, which is not preferable. Furthermore,
If the sum of these Young's moduli is less than 1500 kg/-, the electromagnetic conversion characteristics are insufficient, and the sum of Young's moduli is less than 21
If it exceeds 00 Ky/rtyA, it becomes difficult to obtain a biaxially oriented film without breakage.
上記ベースフィルムは、更に、１５０℃における長手方
向の熱収縮率が４％以上で、幅方向の該熱収縮率が８％
以下であることが必要である。長手方向の１５０℃の熱
収縮率が４％未満であると、幅方向の収縮に対応した張
力をフィルムかけることが出来ず、フィルムに不均一な
張力による皺を生じ、塗工型や蒸着の斑を生じる。また
、幅方向の１５０℃の熱収縮率がマイナスであると、磁
性層の塗工或は蒸着工程でフィルムに適正な張力をかけ
ることができず、塗工型や蒸着斑を生じ、均一な磁性層
を形成するのが困難になる。逆に８％を越えると、過剰
な張力がかかり、塗工や蒸着が困難になる。The base film further has a heat shrinkage rate of 4% or more in the longitudinal direction at 150°C and a heat shrinkage rate of 8% in the width direction.
It is necessary that the following is true. If the heat shrinkage rate at 150°C in the longitudinal direction is less than 4%, it will not be possible to apply tension to the film that corresponds to the shrinkage in the width direction, causing wrinkles in the film due to uneven tension, and the coating mold and vapor deposition Causes spots. Additionally, if the heat shrinkage rate at 150°C in the width direction is negative, it will not be possible to apply appropriate tension to the film during the coating or vapor deposition process of the magnetic layer, resulting in uneven coating and vapor deposition. It becomes difficult to form a magnetic layer. Conversely, if it exceeds 8%, excessive tension will be applied, making coating and vapor deposition difficult.
上記ベースフィルムは、更に、結晶化度が５０％以下で
あることが必要である。ここに云う“°結晶化度″は、
ポリエチレン−２，６−ナフタリンジカルボキシレート
の結晶密度を１，４０７ｇ／ ０１’、非晶密度を１．
３２８ｙ／＊とじて、フィルム密度より締出とした重量
分布結晶化度をもって表わす。この結晶化度は、磁性層
との接着性の観点から５０％以下であることが必要で、
結晶化度が５０％を越えると高分子バインダーとの接着
力や金属元素の蒸着力が低下し、均一強固な磁性層を形
成することが困難になる。The base film further needs to have a crystallinity of 50% or less. The “degree of crystallinity” referred to here is
The crystal density of polyethylene-2,6-naphthalene dicarboxylate is 1,407 g/01', and the amorphous density is 1.
328y/* represents the weight distribution crystallinity determined from the film density. This crystallinity needs to be 50% or less from the viewpoint of adhesion with the magnetic layer.
If the degree of crystallinity exceeds 50%, the adhesive strength with the polymer binder and the deposition strength of the metal element will decrease, making it difficult to form a uniform and strong magnetic layer.
本発明においてベースフィルムは、７０℃における長手
方向の熱収縮率が０．１％以下であることが好ましい。In the present invention, the base film preferably has a longitudinal heat shrinkage rate of 0.1% or less at 70°C.
この熱収縮率が大きすぎると、使用環境の温度変化によ
り磁気記録媒体の寸法変化を生じ、磁気記録時と再生時
に信号のズレを生じるようになるので、好ましくない。If this thermal shrinkage rate is too large, the dimensions of the magnetic recording medium will change due to changes in the temperature of the environment in which it is used, resulting in a signal shift between magnetic recording and reproduction, which is undesirable.
本発明における二軸配向ポリエチレン−２，６−ナフタ
リンジカルボキシレートフィルム（ベースフィルム）は
、その表面粗さくＲａ ’）がｏ、ｏｉｏμｍ以下、更
には０．００７μｍ以下であることが好ましい。この表
面粗さくＲａ ）が大きすぎると、磁性層が高級品質の
磁気記録テープとして必要な電磁変換特性を維持するこ
とができなくなるので、好ましくない。The biaxially oriented polyethylene-2,6-naphthalene dicarboxylate film (base film) in the present invention preferably has a surface roughness (Ra′) of not more than o, oio μm, more preferably not more than 0.007 μm. If the surface roughness (Ra) is too large, the magnetic layer will not be able to maintain the electromagnetic conversion characteristics necessary for a high-quality magnetic recording tape, which is undesirable.
上記表面粗さはポリエチレン−２，６−ナフタリンジカ
ルボキシレート中（以下、ＰＥＮと略称することがある
）に不活性固体微粒子を含有させることによって、或は
フィルム表面の表面加工処理によって形成せしめること
ができる。このうち不活性固体微粒子を用いる方法が好
ましい。The above surface roughness can be formed by incorporating inert solid fine particles into polyethylene-2,6-naphthalene dicarboxylate (hereinafter sometimes abbreviated as PEN) or by surface treatment of the film surface. Can be done. Among these, a method using inert solid fine particles is preferred.
不活性固体微粒子としては、本発明においては、好まし
くは■二酸化ケイ素（水和物、ケイソウ土。In the present invention, the inert solid particles are preferably silicon dioxide (hydrate, diatomaceous earth).
ケイ砂１石英等を含む）；■アルミナ：■５ｉ０２分を
３０重母％以上含有するケイ酸塩（例えば非晶質或は結
晶質の粘土鉱物、アルミノシリケート（焼成物や水和物
を含む）、温石綿、ジルコン、フライアッシュ等）；０
Ｍ（］ 、Ｚｎ 、Ｚｒ及びＴｉの酸化物：■Ｃａ、及
びＢａの硫酸塩；■ｌｉ、Ｎａ、及びＣａのリン酸塩（
１水素塩や２水素塩を含む）；■Ｌ！ 、Ｎａ 、及び
Ｋの安息香酸塩；■Ｃａ、Ｂａ、Ｚｎ、及びＭｎのテレ
フタル酸塩；■ＭＵ 、 Ｃａ 、 Ｂａ 、 ｚｎ
、 ｃｄ 。(including silica sand 1 quartz, etc.); ■ Alumina: ■ Silicates containing 30% or more of 5i02 (e.g. amorphous or crystalline clay minerals, aluminosilicates (including calcined products and hydrates) ), warm asbestos, zircon, fly ash, etc.); 0
M(], oxides of Zn, Zr, and Ti: ■ sulfates of Ca, and Ba; ■ phosphates of li, Na, and Ca (
(Including monohydrogen salts and dihydrogen salts);■L! , Na, and K benzoates;■Terephthalates of Ca, Ba, Zn, and Mn;■MU, Ca, Ba, zn
, cd.
Ｐｂ 、Ｓｒ 、Ｍｎ 、Ｆｅ 、Ｃｅ及びＮｉのチタ
ン酸゛塩；■Ｂａ、及びｐｂのクロム酸塩：■炭素（例
えばカーボンブラック、グラファイト等）：０ガラス（
例えばガラス粉、ガラスピーズ等）；＠Ｃａ 、及びＭ
（＋の炭酸塩；■ホタル石及び■ＺｎＳが例示される。Titanate salts of Pb, Sr, Mn, Fe, Ce and Ni; ■Chromates of Ba and Pb: ■Carbon (e.g. carbon black, graphite, etc.): 0 Glass (
For example, glass powder, glass peas, etc.); @Ca, and M
(+ carbonate; ■fluorspar and ■ZnS are exemplified.
更に好ましくは、無水ケイ酸。More preferably, silicic anhydride.
含水ケイ酸、ｍ化アルミニウム、ケイ酸アルミニウム（
焼成物、水和物等を含む）、燐酸１リチウム、燐酸３リ
チウム、燐酸ナトリウム、燐酸カルシウム、硫酸バリウ
ム、酸化チタン、安息香酸リチウム、これらの化合物の
複塩（水和物を含む）、ガラス粉、粘土（カオリン、ベ
ントナイト、白土等を含む）、タルク、ケイ藻土、炭酸
カルシウム等が例示される。特に好ましくは、二酸化ケ
イ素。Hydrous silicic acid, aluminum mide, aluminum silicate (
(including fired products, hydrates, etc.), monolithium phosphate, trilithium phosphate, sodium phosphate, calcium phosphate, barium sulfate, titanium oxide, lithium benzoate, double salts of these compounds (including hydrates), glass Examples include powder, clay (including kaolin, bentonite, white clay, etc.), talc, diatomaceous earth, calcium carbonate, and the like. Particularly preferred is silicon dioxide.
酸化チタン、炭酸カルシウムが挙げられる。これらの不
活性固体微粒子はその平均粒径が０．０５−０．６μｒ
ｒｔ 、更には０．０８〜０．４．ｃｚｍが好ましく、
またその添加量は０．０１〜１．５重量％（対ＰＥＮ）
、更には０．０３〜１．０重量％（同）、特に０．０５
〜０．６重量％（同）であることが好ましい。Examples include titanium oxide and calcium carbonate. These inert solid fine particles have an average particle size of 0.05-0.6μr.
rt, and even 0.08 to 0.4. czm is preferred;
The amount added is 0.01 to 1.5% by weight (relative to PEN)
, furthermore 0.03 to 1.0% by weight (same), especially 0.05
It is preferably 0.6% by weight (same).
本発明において二軸配向フィルムは上述の特性を有する
必要があるが、二軸配向化の方法とじては一般的なロー
ルやステンターを用いて縦横同時に延伸してもよく、又
縦横各々逐次に延伸してもよいが、少なくとも縦方向に
２段以上延伸することが好ましい。延伸条件は、例えば
延伸温度は１段目延伸部度（例えば縦方向延伸温度：Ｔ
１）が（Ｔ（］−１０）〜（Ｔｇ＋４５）’Ｃの範囲（
但し、ＴＯ：’ポリエステルのガラス転移温度）から、
２段目延伸温度（例えば横方向延伸温度：Ｔ２）が（Ｔ
＋＋１５）〜＜Ｔ＋ ＋４０） ’Ｃの範囲から選択す
るとよい。また、延伸倍率は一軸方向の延伸倍率が２．
５以上、特に３倍以上でかつ面積倍率が８倍以上、特に
１０倍以上となる範囲から選択するとよい。更にまた、
熱固定温度は１８０〜２５０℃、更には２００〜２３０
℃の範囲から選択するとよい。In the present invention, the biaxially oriented film must have the above-mentioned properties, but the biaxially oriented film may be stretched simultaneously in the longitudinal and lateral directions using a general roll or stenter, or it may be stretched in the longitudinal and lateral directions sequentially. However, it is preferable to stretch at least two or more stages in the longitudinal direction. Stretching conditions include, for example, stretching temperature, first stage stretching temperature (for example, longitudinal stretching temperature: T
1) is in the range (T(]-10) to (Tg+45)'C (
However, from TO:'glass transition temperature of polyester),
The second-stage stretching temperature (for example, lateral stretching temperature: T2) is (T
It is recommended to select from the range of ++15) to <T+ +40)'C. Furthermore, the stretching ratio in the uniaxial direction is 2.
It is preferable to select from a range in which the area magnification is 5 times or more, especially 3 times or more, and the area magnification is 8 times or more, especially 10 times or more. Furthermore,
Heat setting temperature is 180-250℃, even 200-230℃
It is recommended to select from the range of ℃.
二軸配向フィルムの厚みは１５〜４μ而が好ましく、更
には塗布型磁性層のベースフィルムとしては９〜４μｍ
が好ましく、また蒸着磁性層のベースフィルムとしては
１４〜６μｍが好ましい。The thickness of the biaxially oriented film is preferably 15 to 4 μm, and more preferably 9 to 4 μm as the base film of the coated magnetic layer.
is preferable, and the base film of the vapor-deposited magnetic layer preferably has a thickness of 14 to 6 μm.
本発明における磁気記録媒体は、上述のベースフィルム
の少なくとも一表面上、すなわち片面上または両面上に
磁性層を設けたちのであるが、該磁性層は強磁性粉体を
含有する高分子バインダーからなるもの、いわゆる塗布
型磁性層でも、また強磁性金属を物理蒸着させたもの、
いわゆる蒸着型磁性層でも良い。In the magnetic recording medium of the present invention, a magnetic layer is provided on at least one surface of the above-mentioned base film, that is, on one side or both sides, and the magnetic layer is made of a polymer binder containing ferromagnetic powder. There are also so-called coated magnetic layers, as well as those made by physical vapor deposition of ferromagnetic metals.
A so-called vapor-deposited magnetic layer may also be used.
塗布型磁性層に用いる強磁性粉体としては、γ−酸化鉄
、Ｃｏ含有酸化鉄、鉄粉、Ｇｏを含んだ鉄粉、これらと
バリウムフェライトとを組合せたもの等を好ましく例示
できる。これらは出来るだけ均一なものが好ましい。更
に強磁性金属粉末はその８０重ω％以上が０．１〜０．
３μｍ長さの微細針状鉄粉であることが好ましい。また
、高分子バインダーとしては、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、ポリビニルブチラール、塩化ビニリデン−ア
クリロニトリル共重合体、アクリロニトリル−アクリル
酸ブチル−２−ヒドロキシエチルメタクリレート共重合
体などのビニル系樹脂、アクリロニトリル−ブタジェン
共重合体などのゴム系樹脂、ニトロセルロース、アセチ
ルセルースなどの繊維系樹脂、エポキシ、フェノキシ、
ウレタンなどの架橋性樹脂などを好ましく例示できる。Preferred examples of the ferromagnetic powder used in the coated magnetic layer include γ-iron oxide, Co-containing iron oxide, iron powder, Go-containing iron powder, and a combination of these and barium ferrite. It is preferable that these be as uniform as possible. Furthermore, the ferromagnetic metal powder has a content of 80 wt ω% or more of 0.1 to 0.
Preferably, the iron powder is fine acicular iron powder with a length of 3 μm. In addition, examples of the polymer binder include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, polyvinyl butyral, vinylidene chloride-acrylonitrile copolymer, acrylonitrile-butyl acrylate-2-hydroxyethyl Vinyl resins such as methacrylate copolymers, rubber resins such as acrylonitrile-butadiene copolymers, fiber resins such as nitrocellulose and acetyl cellulose, epoxy, phenoxy,
Preferred examples include crosslinkable resins such as urethane.
これらは単独で用いてもよく、又組合せて用いてもよい
。又、防錆のため、微細針状鉄粉の表面処理を施したも
のを用いてもよく、バインダー中に防錆剤を含有せしめ
てもよい。These may be used alone or in combination. Further, for rust prevention, a surface-treated fine acicular iron powder may be used, and a rust preventive agent may be contained in the binder.
塗布型磁性層には、所望により、減磨剤（例えばアルミ
ナ等）、′ａ光剤（例えばカーボンブラック等）、潤滑
剤１分散剤、帯電防止剤等の如き他の剤を加えても良い
。If desired, other agents such as an abrasive agent (for example, alumina, etc.), an optical agent (for example, carbon black, etc.), a lubricant, a dispersant, an antistatic agent, etc. may be added to the coated magnetic layer. .
塗布型磁性層は、従来から知られている方法で形成でき
る。磁性塗料の塗工には、例えばロールコート法、グラ
ビアコート法、ロールプラッシュ法、スプレーコート法
、エアーナイフコート法等を用いることができる。この
磁性層の厚みは３〜２μｍが好ましい。The coated magnetic layer can be formed by a conventionally known method. For applying the magnetic paint, for example, a roll coating method, a gravure coating method, a roll plush method, a spray coating method, an air knife coating method, etc. can be used. The thickness of this magnetic layer is preferably 3 to 2 μm.
また、蒸着型磁性層に用いる強磁性金属としてはコバル
ト、ニッケル、これらとクロムの合金等を例示すること
ができる。この蒸着型磁性層は従来から知られている方
法で形成することができ、例えば真空蒸着法、スパッタ
法等で形成することができる。この磁性層の厚みは、約
１μｍが好ましい。Furthermore, examples of ferromagnetic metals used in the vapor-deposited magnetic layer include cobalt, nickel, and alloys of these and chromium. This evaporation type magnetic layer can be formed by a conventionally known method, such as a vacuum evaporation method or a sputtering method. The thickness of this magnetic layer is preferably about 1 μm.
本発明の磁気記録媒体は、その製造時のトラブルが改善
され、しかも走行性や耐久性が良好であり、磁性層が均
一かつ強固にベースフィルムと接着しているので、初期
及び経時後の電磁変換特性にすぐれており、高密度長時
間の磁気記録が可能な媒体として有用である。The magnetic recording medium of the present invention has improved troubles during manufacturing, has good runnability and durability, and has a magnetic layer that is uniformly and firmly adhered to the base film, so it can be used both initially and after aging. It has excellent conversion characteristics and is useful as a medium capable of high-density, long-term magnetic recording.
［実施例コ
以下実施例に基いて本発明を更に説明する。なお、本発
明における種々の物性値及び特性は以下の如くして測定
されたものであり、かつ定義される。[Example] The present invention will be further explained based on the following example. Note that various physical property values and characteristics in the present invention were measured and defined as follows.
（１） ヤング率
フィルムを試料幅１０ｍ、長さ１５ｃｍに切り、チャッ
ク間１００ ｍｍにして引張速度１０ｍｍ／分、チャー
ト速度１００ｍｍ／分にインストロンタイプの万能引張
試験装置にて引張り、得られた荷重−伸び曲線の立上り
部の接線よりヤング率を計算する。(1) Young's modulus film was cut into sample widths of 10 m and lengths of 15 cm, and pulled using an Instron type universal tensile tester at a tension speed of 10 mm/min and a chart speed of 100 mm/min with a chuck gap of 100 mm. Young's modulus is calculated from the tangent to the rising part of the load-elongation curve.
（２）Ｆ−５値
上記ヤング率の測定時、引張速度１００ｍ／分のチャー
ト速度１００ｍ／分としたとき、５％引張時の応力より
求める。(2) F-5 value When measuring the above Young's modulus, it is determined from the stress at 5% tension when the tension speed is 100 m/min and the chart speed is 100 m/min.
（３１１５０℃における熱収縮率
フィルムを３５ ａｒｒ四方に切り抜き、３０ ｃｍ間
隔の標点を長手方向及び幅方向につけ、１５０℃で３０
分の熱処理を行ない、熱処理前後の寸法変化より収縮率
を求める。(Heat shrinkage rate at 31150°C Cut the film into 35 arr squares, attach gauges at 30 cm intervals in the longitudinal direction and width direction,
The shrinkage rate is calculated from the dimensional change before and after the heat treatment.
（４） ７０℃における熱収縮率
フィルムを６．３５ｍｍ幅で長さ５５ ｃｍに、フィル
ムの長手方向に切り抜き、標点間距離を約３０ Ｃｍと
して印をつけ、１５７の荷重をかけてこれをデジタル精
密測長機（フリー社製）を用い１／１０００ｍｍまで読
みとり、このフィルムサンプル片を７０℃で１時間熱処
理したのち、再びデジタル精密測長機で熱処理後の標点
間距離を１ ／ １０００ｍｍまで読みとり、熱処理前
後の寸法変化により収縮率を求める。(4) Heat shrinkage rate at 70°C Cut out a film with a width of 6.35 mm and a length of 55 cm in the longitudinal direction of the film, mark it with a gauge distance of about 30 cm, and apply a load of 157 to this. Measure down to 1/1000 mm using a digital precision length measuring machine (manufactured by Free Company), heat treat this film sample piece at 70°C for 1 hour, and then use the digital precision length measuring machine again to measure the gauge distance after heat treatment to 1/1000 mm. The shrinkage rate is calculated from the dimensional changes before and after heat treatment.
（５） フィルム表面粗さくＲａ ）中心線平均粗さ
：Ｒａ（単位μＴｒＬ）としてＪｌ ３−３０６０１で
定義される値である。(5) Film surface roughness Ra) Center line average roughness: Ra (unit μTrL) is a value defined in Jl 3-30601.
本発明では、（株小坂研究所の触針式表面粗さ計（ＳＵ
ＲＦＣＯＲＤＥＲ５Ｅ−３０Ｃ）を用いて、触針半径：
２μｍ、測定圧二 ０．０３ｇ。In the present invention, the stylus type surface roughness meter (SU
RFCORDER5E-30C), stylus radius:
2μm, measurement pressure 2 0.03g.
カットオフ値：０，２５ｓｉの条件下にフィルム表面粗
さ曲線をかかせ、得られるフィルム表面粗さ曲線からそ
の中心線の方向に測定長さしの部分を抜き取り、この扱
き取り部分の中心線をＸ軸とし、縦倍率の方向をＹ軸と
して、粗さ曲線をＹ＝ｆ（ｘ）で表わすとき、次の式で
与えられる値（Ｒａ ：μ′ｒｒＬ）をフィルム表面粗
さとして定義する。A film surface roughness curve is drawn under the condition of cut-off value: 0.25si, and a part of the measured length is extracted from the obtained film surface roughness curve in the direction of its center line, and the center line of this handled part is When the roughness curve is expressed as Y=f(x), where is the X-axis and the vertical magnification direction is the Y-axis, the value (Ra:μ'rrL) given by the following formula is defined as the film surface roughness. .
Ｒａ ＝１／Ｌｆｏｌ ｆ （ｘ ） ｌｄｘ本
発明では、基準長を２．５簡として５個測定し、値の大
きい方から１個除いた４個の平均値としてＲａを表わす
。Ra = 1/Lfol f (x) ldx In the present invention, five measurements are taken using a reference length of 2.5 lengths, and Ra is expressed as the average value of the four measurements, excluding the one with the largest value.
（６］ ｆａ気ココ−ティングフィルム電磁変換特性
ビデオ特性は、記録再生ヘッドをセンダスト合金に改造
したＶＨ８方式ＶＴＲ（日本ビクター■製造 商品名ｒ
ＨＲ７３００Ｊ）を用いて４ＭＨＺの再生出力を測定し
た値である。標準テープは市販されているγ−Ｆ８２０
３層塗布タイプの１／２ＶＨ３用テープである。(6) Fa air coating film electromagnetic conversion characteristics Video characteristics are VH8 type VTR (manufactured by Victor Japan, product name: r
This is a value measured using a 4MHZ reproduction output (HR7300J). The standard tape is commercially available γ-F820.
This is a 3-layer coating type 1/2 VH3 tape.
Ｃ／Ｎ比は、４ＭＨｚのキャリヤー信号を記録し、再生
された振幅変調信号の３０Ｍ Ｈｚのところのレベルを
ノイズレベルとするときのＣ／Ｎ比である。The C/N ratio is the C/N ratio when a 4 MHz carrier signal is recorded and the level of the reproduced amplitude modulated signal at 30 MHz is taken as the noise level.
再生出力及びＣ／Ｎが ７ｄＢ以上の時を優秀 ３ｄＢ以上７ｄＢ未満の時を良好 ３ｄＢ未満を不良 とする。Playback output and C/N Excellent when over 7dB Good when 3dB or more and less than 7dB Less than 3dB is defective shall be.
（７）磁気テープの耐久性
家庭用ビデオテープレコーダ（ヘリカルスキャン）にカ
セットし、走行開始、停止を繰り返しながら１００時間
送行させ走行状態を調べるとともに出力測定を行ない、
この走行において下記項目を全て満足する場合を走行性
：良好、そうでない場合を走行性：不良と判定する。(7) Durability of magnetic tape A cassette was placed in a home video tape recorder (helical scan), and the tape was fed for 100 hours while repeatedly starting and stopping, and the running condition was examined and the output was measured.
If all of the following items are satisfied during this run, the running performance is determined to be good, and if not, the running performance is determined to be poor.
■ テープの端が折れたりワカメ状にならない■ 走行
中のテープ鳴きが生じない
■ テープが裂けたり、破断したりしない実施例１
固有粘度０．６０のポリエチレン−２，６−ナフタリン
ジカルボキシレート（ＰＥＮ）のベレットを１１０℃３
時間予備乾燥し、更に１８０℃４時間乾燥した後、押出
数ホッパーに供給し、溶融温度２９５〜３０５℃で溶融
し、この溶融ポリマーを１゜ＯＭ開度のスリット状ダイ
を通して表面仕上げ０．３３程度１表面温度６０℃の回
転冷却ドラム上に成形押出し、厚み１４０μｍの未延伸
のフィルムを得た。■ The edges of the tape do not bend or become seaweed ■ The tape does not squeal during running ■ The tape does not tear or break Example 1 Polyethylene-2,6-naphthalene dicarboxylate (with an intrinsic viscosity of 0.60) PEN) pellet at 110℃3
After pre-drying for 4 hours and further drying at 180℃ for 4 hours, the polymer is fed to an extrusion hopper and melted at a melting temperature of 295-305℃. The product was formed and extruded on a rotary cooling drum with a surface temperature of 60° C. to obtain an unstretched film having a thickness of 140 μm.
このようにして得られた未延伸フィルムを、公知のロー
ル延伸法により、１２０℃に予備加熱したのち赤外線ヒ
ーターで１５０℃に加熱しながら、縦方向に５．０倍に
延伸しく第１段延伸）、更に公知のステンター法により
１３０℃に加熱しながら横方向に４．０倍延伸しく第
２段延伸）、２００℃で熱固定したのち引続き１８０℃
で横方向に １．０５倍に延伸しく第３段延伸）、厚み
７．０μｍの二軸配向ＰＥＮフィルムを得た。The thus obtained unstretched film was preheated to 120°C by a known roll stretching method, and then stretched to 5.0 times in the longitudinal direction while being heated to 150°C with an infrared heater. ), further stretched by 4.0 times in the transverse direction while heating to 130°C by the known stenter method (second stage stretching), heat set at 200°C, and then further stretched at 180°C.
A biaxially oriented PEN film with a thickness of 7.0 μm was obtained by stretching 1.05 times in the transverse direction (third stage stretching).
一方、５％のコバルトを含有する針状のα−Ｆｅ ＯＯ
Ｈを加熱分解して得たα−Ｆｅｚｅｓを水素還元して、
平均針状長さ０．２μｍの強磁性鉄粉を得た。On the other hand, acicular α-Fe OO containing 5% cobalt
α-Fezes obtained by thermal decomposition of H is reduced with hydrogen,
Ferromagnetic iron powder with an average needle length of 0.2 μm was obtained.
上記強磁性鉄粉１００重量部（以下単に「部」と記す）
と下記の組成物をボールミルで１２時間混線分散した。100 parts by weight of the above ferromagnetic iron powder (hereinafter simply referred to as "parts")
The following composition was mixed and dispersed in a ball mill for 12 hours.
ポリエステルポリウレタン １２部塩化ビ
ニル−酢酸ビニル−
無水マレイン酸共重合体 １０部α−アルミナ
５部カーボンブラック
１部酢酸ブチル
７０部メチルエチルケトン
３５部シクロへキサノン ｉｏ
ｏ部上記分散処理後、更に
脂肪酸エステル（アミルステア−レート）１部を添加し
てなお１５〜３０分混練した。更に、トリイソシアネー
ト化合物の２５％酢酸エチル溶液７部を加え、１時間高
速剪断分散して磁性塗布液を調整した。Polyester polyurethane 12 parts Vinyl chloride-vinyl acetate-maleic anhydride copolymer 10 parts α-alumina 5 parts Carbon black
1 part butyl acetate
70 parts methyl ethyl ketone
35 parts cyclohexanone io
Part o After the above dispersion treatment, 1 part of fatty acid ester (amyl stearate) was further added and kneaded for another 15 to 30 minutes. Furthermore, 7 parts of a 25% ethyl acetate solution of a triisocyanate compound was added and dispersed under high-speed shearing for 1 hour to prepare a magnetic coating solution.
得られた塗布液を上記厚さ ７．０μｍのＰＥＮフィル
ム上に乾燥膜厚が３．０μｍとなろうに塗布した。The resulting coating solution was applied onto the above-mentioned 7.0 μm thick PEN film to give a dry film thickness of 3.0 μm.
次いで直流磁場中で配向処理したのち、１００℃で乾燥
した。乾燥後、カレンダリング処理をして１部２インチ
幅にスリットして厚み１０μｍのビデオ用の磁気テープ
を得た。Next, after orientation treatment in a DC magnetic field, it was dried at 100°C. After drying, the tape was calendered and slit into 2-inch pieces to obtain a video magnetic tape having a thickness of 10 μm.
かくして得られた磁気テープの評価した結果は表−１に
示す通りであり、電磁変換特性も優秀であり、かつテー
プの耐久性も良好であった。The results of evaluation of the thus obtained magnetic tape are shown in Table 1, and the electromagnetic conversion characteristics were excellent and the durability of the tape was also good.
実施例２〜３
実施例１において未延伸フィルムの厚さ、延伸倍率及び
熱処理条件を調整して各々厚み１０μｍの磁気テープを
得た。Examples 2 to 3 In Example 1, the thickness of the unstretched film, the stretching ratio, and the heat treatment conditions were adjusted to obtain magnetic tapes each having a thickness of 10 μm.
この磁気テープの評価結果を表−１に示すが、実施例１
と同様電磁変換特性もテープの耐久性も良好であった。The evaluation results of this magnetic tape are shown in Table 1, and Example 1
Similarly, the electromagnetic characteristics and durability of the tape were also good.
比較例−１
実施例１において熱固定温度を２５０℃と変更する以外
は全く同様に行って厚み１０μ汎の磁気テープを得た。Comparative Example 1 A magnetic tape having a thickness of 10 μm was obtained in exactly the same manner as in Example 1 except that the heat setting temperature was changed to 250° C.
このテープの評価結果を表−１に示ずが、電磁変換特性
としてＣ／Ｎが不良で、磁気記録媒体としては不満足な
ものであった。The evaluation results of this tape are not shown in Table 1, but as an electromagnetic conversion characteristic, the C/N was poor, and it was unsatisfactory as a magnetic recording medium.
実施例−４
実施例−３に於いて第３段延伸後フィルムを８０℃で２
４時間エージングした。実施例−３のフィルムの７０℃
熱収縮率は０．０８％であるが、上記エージング後のフ
ィルムは０．０３％である。このフィルムに実施例−３
と同様にして磁性層を形成した。Example-4 In Example-3, the film after third stage stretching was heated at 80°C for 2
It was aged for 4 hours. 70°C of the film of Example-3
The heat shrinkage rate is 0.08%, but the film after aging is 0.03%. Example-3 for this film
A magnetic layer was formed in the same manner as described above.
こうして得られたテープは、温度Ｏ℃と５０℃の雰囲気
下に１００回繰返しおいたのちもかかる温度変化を受け
ないテープと同様に、走行性や耐久性、電気変換特性が
良好であった。The thus obtained tape had good runnability, durability, and electrical conversion characteristics, as well as tapes that did not undergo such temperature changes even after being repeatedly placed in an atmosphere at temperatures of 0° C. and 50° C. 100 times.
表−１Table-1
Claims (1)
けた磁気記録媒体において、該ベースフィルムが、長手
方向の５％伸長時応力が１５Ｋｇｍｍ＾２以上であり、
長手方向のヤング率が６５０Ｋｇ／ｍｍ＾２以上で幅方
向のヤング率が５００ｋｇ／ｍｍ＾２以上でかつこれら
ヤング率の和が１４００〜２１００ｋｇ／ｍｍ＾２の範
囲にあり、１５０℃における長手方向の熱収縮率が４％
以上で幅方向の熱収縮率が８％以下であり、かつ結晶化
度が５０％以下である二軸配向ポリエチレン−２，６−
ナフタリンジカルボキシレートフィルムであることを特
徴とする磁気記録媒体。 ２、フィルムの７０℃における長手方向の熱収縮率が０
．１％以下である特許請求の範囲第１項記載の磁気記録
媒体。[Claims] 1. A magnetic recording medium having a magnetic layer provided on at least one surface of a base film, wherein the base film has a stress of 15 Kgmm^2 or more when elongated by 5% in the longitudinal direction,
The Young's modulus in the longitudinal direction is 650 kg/mm^2 or more, the Young's modulus in the width direction is 500 kg/mm^2 or more, and the sum of these Young's moduli is in the range of 1400 to 2100 kg/mm^2, and the longitudinal direction at 150 ° C. The heat shrinkage rate is 4%
Biaxially oriented polyethylene-2,6- having a heat shrinkage rate of 8% or less in the width direction and a crystallinity of 50% or less
A magnetic recording medium characterized in that it is a naphthalene dicarboxylate film. 2. The longitudinal heat shrinkage rate of the film at 70°C is 0.
．． The magnetic recording medium according to claim 1, wherein the magnetic recording medium has a content of 1% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61258467A JPH0618070B2 (en) | 1986-10-31 | 1986-10-31 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61258467A JPH0618070B2 (en) | 1986-10-31 | 1986-10-31 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63113931A true JPS63113931A (en) | 1988-05-18 |
| JPH0618070B2 JPH0618070B2 (en) | 1994-03-09 |
Family
ID=17320632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61258467A Expired - Lifetime JPH0618070B2 (en) | 1986-10-31 | 1986-10-31 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0618070B2 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0850718A (en) * | 1995-07-27 | 1996-02-20 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| US5763046A (en) * | 1991-01-21 | 1998-06-09 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5827600A (en) * | 1991-01-21 | 1998-10-27 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6096406A (en) * | 1997-07-15 | 2000-08-01 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6203934B1 (en) | 1997-10-14 | 2001-03-20 | Fui Photo Film Co., Ltd. | Magnetic recording medium |
| US6254964B1 (en) | 1997-02-10 | 2001-07-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6291052B1 (en) | 1997-06-30 | 2001-09-18 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6316077B1 (en) | 1998-06-22 | 2001-11-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| WO2002047889A1 (en) * | 2000-12-11 | 2002-06-20 | Teijin Limited | Biaxially oriented polyester film and method for production thereof |
| US6432503B2 (en) | 1997-03-31 | 2002-08-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6444290B1 (en) | 1998-06-11 | 2002-09-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions |
| US6579592B1 (en) | 1996-11-29 | 2003-06-17 | Fuji Photo Film Co., Ltd | Magnetic recording tape with controlled Hc and magnetic flux/unit area value and controlled Cl/Fe intensity |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4838006A (en) * | 1971-09-14 | 1973-06-05 | ||
| JPS49114916A (en) * | 1973-03-02 | 1974-11-01 | ||
| JPS5045876A (en) * | 1973-08-29 | 1975-04-24 | ||
| JPS50100174A (en) * | 1974-01-10 | 1975-08-08 | ||
| JPS6228918A (en) * | 1985-07-30 | 1987-02-06 | Teijin Ltd | Magnetic recording tape |
| JPS62135339A (en) * | 1985-12-09 | 1987-06-18 | Diafoil Co Ltd | Polyethylene-2,6-naphthalate film for magnetic recording medium |
-
1986
- 1986-10-31 JP JP61258467A patent/JPH0618070B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4838006A (en) * | 1971-09-14 | 1973-06-05 | ||
| JPS49114916A (en) * | 1973-03-02 | 1974-11-01 | ||
| JPS5045876A (en) * | 1973-08-29 | 1975-04-24 | ||
| JPS50100174A (en) * | 1974-01-10 | 1975-08-08 | ||
| JPS6228918A (en) * | 1985-07-30 | 1987-02-06 | Teijin Ltd | Magnetic recording tape |
| JPS62135339A (en) * | 1985-12-09 | 1987-06-18 | Diafoil Co Ltd | Polyethylene-2,6-naphthalate film for magnetic recording medium |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6020022A (en) * | 1991-01-21 | 2000-02-01 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6015602A (en) * | 1991-01-21 | 2000-01-18 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5985408A (en) * | 1991-01-21 | 1999-11-16 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5763046A (en) * | 1991-01-21 | 1998-06-09 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5811172A (en) * | 1991-01-21 | 1998-09-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5811166A (en) * | 1991-01-21 | 1998-09-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5827600A (en) * | 1991-01-21 | 1998-10-27 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5851622A (en) * | 1991-01-21 | 1998-12-22 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5780141A (en) * | 1991-04-25 | 1998-07-14 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US5792543A (en) * | 1991-04-25 | 1998-08-11 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| JPH0850718A (en) * | 1995-07-27 | 1996-02-20 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| US6579592B1 (en) | 1996-11-29 | 2003-06-17 | Fuji Photo Film Co., Ltd | Magnetic recording tape with controlled Hc and magnetic flux/unit area value and controlled Cl/Fe intensity |
| US6254964B1 (en) | 1997-02-10 | 2001-07-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6432503B2 (en) | 1997-03-31 | 2002-08-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6291052B1 (en) | 1997-06-30 | 2001-09-18 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6096406A (en) * | 1997-07-15 | 2000-08-01 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| US6203934B1 (en) | 1997-10-14 | 2001-03-20 | Fui Photo Film Co., Ltd. | Magnetic recording medium |
| US6444290B1 (en) | 1998-06-11 | 2002-09-03 | Fuji Photo Film Co., Ltd. | Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions |
| US6316077B1 (en) | 1998-06-22 | 2001-11-13 | Fuji Photo Film Co., Ltd. | Magnetic recording medium |
| WO2002047889A1 (en) * | 2000-12-11 | 2002-06-20 | Teijin Limited | Biaxially oriented polyester film and method for production thereof |
| US6890471B2 (en) | 2000-12-11 | 2005-05-10 | Teijin Limited | Biaxially oriented polyester film and method for production thereof |
| US7122241B2 (en) | 2000-12-11 | 2006-10-17 | Teijin Limited | Biaxially oriented polyester film and production process therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0618070B2 (en) | 1994-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |