JPH04325914A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH04325914A JPH04325914A JP3121764A JP12176491A JPH04325914A JP H04325914 A JPH04325914 A JP H04325914A JP 3121764 A JP3121764 A JP 3121764A JP 12176491 A JP12176491 A JP 12176491A JP H04325914 A JPH04325914 A JP H04325914A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- magnetic recording
- weight
- undercoat 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 46
- JKFYKCYQEWQPTM-UHFFFAOYSA-N 2-azaniumyl-2-(4-fluorophenyl)acetate Chemical compound OC(=O)C(N)C1=CC=C(F)C=C1 JKFYKCYQEWQPTM-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910021595 Copper(I) iodide Inorganic materials 0.000 claims abstract description 4
- 229910021612 Silver iodide Inorganic materials 0.000 claims abstract description 4
- BWFPGXWASODCHM-UHFFFAOYSA-N copper monosulfide Chemical compound [Cu]=S BWFPGXWASODCHM-UHFFFAOYSA-N 0.000 claims abstract description 4
- LSXDOTMGLUJQCM-UHFFFAOYSA-M copper(i) iodide Chemical compound I[Cu] LSXDOTMGLUJQCM-UHFFFAOYSA-M 0.000 claims abstract description 4
- 229940045105 silver iodide Drugs 0.000 claims abstract description 4
- 229910052595 hematite Inorganic materials 0.000 claims abstract description 3
- 239000011019 hematite Substances 0.000 claims abstract description 3
- 229910003437 indium oxide Inorganic materials 0.000 claims abstract description 3
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims abstract description 3
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229940056932 lead sulfide Drugs 0.000 claims abstract description 3
- 229910052981 lead sulfide Inorganic materials 0.000 claims abstract description 3
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000011231 conductive filler Substances 0.000 claims description 6
- -1 isocyanate compound Chemical class 0.000 claims description 6
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 239000012948 isocyanate Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 2
- 150000002736 metal compounds Chemical class 0.000 claims 1
- 239000006247 magnetic powder Substances 0.000 abstract description 4
- 230000002463 transducing effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229920002635 polyurethane Polymers 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000000314 lubricant Substances 0.000 description 6
- 239000003973 paint Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 125000005442 diisocyanate group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003960 organic solvent 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
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- 229910017344 Fe2 O3 Inorganic materials 0.000 description 1
- 229910017368 Fe3 O4 Inorganic materials 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- BARWIPMJPCRCTP-UHFFFAOYSA-N oleic acid oleyl ester Natural products CCCCCCCCC=CCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC BARWIPMJPCRCTP-UHFFFAOYSA-N 0.000 description 1
- BARWIPMJPCRCTP-CLFAGFIQSA-N oleyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCCOC(=O)CCCCCCC\C=C/CCCCCCCC BARWIPMJPCRCTP-CLFAGFIQSA-N 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
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、非磁性の支持体への密
着性、走行耐久性及び電磁変換特性の良好な、磁気記録
媒体に係る。特に製造工程に於ける半製品ウェブの表面
性及び非磁性支持体への磁性材料の密着性に優れ、しか
も長時間たっても磁性層中の潤滑剤成分の導電性下塗層
への移行の少ない製品として、安定した品質をもつ磁気
記録媒体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium that has good adhesion to a non-magnetic support, good running durability and electromagnetic conversion characteristics. In particular, the surface properties of the semi-finished product web in the manufacturing process and the adhesion of the magnetic material to the non-magnetic support are excellent, and the lubricant component in the magnetic layer does not migrate to the conductive undercoat layer even after a long period of time. As a product, it relates to magnetic recording media with stable quality.
【０００２】0002
【従来の技術】近時磁気記録媒体は、オーディオ、ビデ
オ、コンピュータ等の広い分野で大量の情報を記録する
記録媒体として使用されるようになってきている。これ
に伴なって、磁気記録媒体の高密度化が要求されている
。磁気記録媒体を高密度化する手段の一つとして、強磁
性磁性粉を高充填化する方法が検討されてきている。2. Description of the Related Art Magnetic recording media have recently come to be used as recording media for recording large amounts of information in a wide range of fields such as audio, video, and computers. Along with this, there is a demand for higher density magnetic recording media. As one means of increasing the density of magnetic recording media, a method of increasing the filling of ferromagnetic powder has been studied.
【０００３】0003
【本発明が解決しようとする問題点】しかし、強磁性磁
性粉を高充填化しようとすると、磁性粉の非磁性支持体
への接着性や密着性が低下し、かつ磁性粉の帯電層が高
くなり、この結果磁気記録媒体の走行性が悪くなったり
、放電によるノイズが発生すると言う問題が生じてくる
。この対策として、磁性層と非磁性支持体との間に導電
性の下塗層を設ける構成が提案されているものの、従来
の導電下塗層では、■磁気記録媒体の製造工程において
、均質な表面を形成し難く、■非磁性支持体への密着性
が低く、結果として磁性層の表面性が不良となり、塗布
方向に塗りすじ等が現れやすく、電磁変換特性も悪い。
しかも、■磁性層中に含有される液体潤滑剤成分が、導
電性下塗層へ移行しやすく経時的に走行耐久性が劣化す
る問題が生じている。[Problems to be solved by the present invention] However, when trying to increase the filling of ferromagnetic powder, the adhesion and adhesion of the magnetic powder to the non-magnetic support decreases, and the charged layer of the magnetic powder deteriorates. This results in problems such as poor running performance of the magnetic recording medium and generation of noise due to discharge. As a countermeasure to this problem, a structure in which a conductive undercoat layer is provided between the magnetic layer and the non-magnetic support has been proposed, but with the conventional conductive undercoat layer, It is difficult to form a surface, and (1) the adhesion to the non-magnetic support is low, resulting in poor surface properties of the magnetic layer, easily showing streaks in the coating direction, and poor electromagnetic conversion characteristics. Moreover, there is a problem that (1) the liquid lubricant component contained in the magnetic layer tends to transfer to the conductive undercoat layer, resulting in deterioration of running durability over time.
【０００４】本発明は、従来の問題を解決すべく検討し
た結果達成されたものであり、走行耐久性、非磁性支持
体への密着性、及び電磁変換特性の良好な磁気記録媒体
を提供することを目的としている。The present invention was achieved as a result of studies aimed at solving the conventional problems, and provides a magnetic recording medium with good running durability, adhesion to a non-magnetic support, and electromagnetic conversion characteristics. The purpose is to
【０００５】[0005]
【問題点を解決するための手段】すなわち、本発明の磁
気記録媒体は、非磁性の支持体と、強磁性の磁性粉を含
有する磁性層と、該支持層と該磁性層との間に導電性の
下塗層を設けてなる３層の媒体であって、前記導電性下
塗層が、結合剤及び導電性充填剤として、ヨウ化第１銅
、硫化第２銅、ヨウ化銀、硫化鉛、Ｆｅ２ Ｏ３ （赤
鉄鉱）、Ｆｅ３ Ｏ４ （磁鉄鉱）及び酸化インジウム
からなる化合物の１種又は混合物を含むことを構成の特
徴とするものである。[Means for Solving the Problems] That is, the magnetic recording medium of the present invention includes a non-magnetic support, a magnetic layer containing ferromagnetic magnetic powder, and a space between the support layer and the magnetic layer. A three-layer medium comprising an electrically conductive subbing layer, the electrically conductive subbing layer comprising cuprous iodide, cupric sulfide, silver iodide, as a binder and as a conductive filler. The composition is characterized by containing one or a mixture of compounds consisting of lead sulfide, Fe2 O3 (hematite), Fe3 O4 (magnetite) and indium oxide.
【０００６】従来技術にあっては、導電性充填剤として
、カーボンブラック、グラファイト等々のカーボン系の
充填剤の使用が一般的であるが、カーボン系充填剤で十
分な導電機能を発揮させるには、ＢＥＴ法による比表面
積が１００ｍ２ ／ｇ以上と大きく、かつＤＢＰ法によ
る吸油量の大きな粒子（１００ｇ／１００ｇカーボン以
上）のカーボンを選択する必要があった。かかる比表面
積が大きく、かつ吸油量の大きなカーボン粒子は、均一
分散が困難であるばかりでなく、導電下塗層の表面粗度
が大きくなり、磁性面の表面積を低下させ、電磁変換特
性に悪影響を与えるようになる。[0006] In the prior art, carbon-based fillers such as carbon black and graphite are commonly used as conductive fillers, but in order for carbon-based fillers to exhibit sufficient conductive function, It was necessary to select carbon particles with a large specific surface area of 100 m2/g or more by the BET method and a large oil absorption amount (100 g/100 g carbon or more) by the DBP method. Such carbon particles, which have a large specific surface area and a large oil absorption amount, are not only difficult to uniformly disperse, but also increase the surface roughness of the conductive undercoat layer, reduce the surface area of the magnetic surface, and have a negative effect on electromagnetic conversion characteristics. will begin to give.
【０００７】さらにかかる吸油量の大なる粒子を、導電
下塗層中に存在させると磁性層中に添加含有される低分
子量（Ｍｎ＜２０００）の潤滑剤成分が導電下塗層へ移
行し、表面磁性層の走行耐久性が時間と共に悪化する傾
向があった。Furthermore, when such particles with a large oil absorption amount are present in the conductive undercoat layer, the low molecular weight (Mn<2000) lubricant component added and contained in the magnetic layer is transferred to the conductive undercoat layer. The running durability of the surface magnetic layer tended to deteriorate over time.
【０００８】さらに、潤滑剤成分の導電下塗層への移行
を防止するため、予め多量の潤滑剤成分を導電下塗層に
存在させると、この下塗層の非磁性支持体への密着性が
低下するという別な問題が発生する。Furthermore, in order to prevent the lubricant component from transferring to the conductive undercoat layer, if a large amount of the lubricant component is present in the conductive undercoat layer in advance, the adhesion of this undercoat layer to the non-magnetic support can be improved. Another problem arises in that the value decreases.
【０００９】これに対し、本発明で使用する導電性充填
剤は、前述のカーボンに比べ吸油量がはるかに少ないた
め、前述の如き問題は起らない。On the other hand, the conductive filler used in the present invention has a much lower oil absorption amount than the above-mentioned carbon, so the above-mentioned problem does not occur.
【００１０】しかしながら、当然の事であるが導電性下
塗層の表面粗度を一定水準（例えば中心線平均粗さで０
．０３μｍ以下より好ましくは０．０２μｍ以下、さら
に好ましくは０．０１５μｍ以下）にするため平均粒子
系（ａμｍ）は下塗層の厚さ（ｃμｍ）をパラメーター
として
Ｃ＞ ａ＋０．０２、
好ましくは Ｃ＞１．１ａ＋０．０２、より
好ましくは Ｃ＞１．５ａ＋０．０３の範囲とすべき
である。However, as a matter of course, the surface roughness of the conductive undercoat layer must be maintained at a certain level (for example, the center line average roughness is 0).
．． 03 μm or less, preferably 0.02 μm or less, and more preferably 0.015 μm or less), the average particle system (a μm) is set to C>a+0.02, preferably C> using the thickness of the undercoat layer (cμm) as a parameter. It should be in the range 1.1a+0.02, more preferably C>1.5a+0.03.
【００１１】結合剤や上記充填剤の使用割合は、導電性
充填剤１００重量部当り結合剤５〜１００重量部が適切
で、その他の潤滑剤等々の成分は結合剤１００重量部当
り１〜２０重量部添加するのがよい。[0011] The appropriate proportion of the binder and the filler used is 5 to 100 parts by weight per 100 parts by weight of the conductive filler, and 1 to 20 parts by weight of other components such as lubricants per 100 parts by weight of the binder. It is preferable to add parts by weight.
【００１２】また導電性充填剤の使用割合は、所望の厚
さで下塗層を作成したとき、その表面抵抗値が５００Ｍ
Ω／ｃｍ２ 以下の所望の値となるようにコントロール
するとよい。[0012] The proportion of the conductive filler to be used is such that when the undercoat layer is formed to a desired thickness, its surface resistance value is 500M.
It is preferable to control it to a desired value of Ω/cm2 or less.
【００１３】ここで、下塗層に使用される結合剤樹脂と
しては、塩化ビニル−酢酸ビニル系共重合体、ポリビニ
ルブチラール樹脂、繊維素系樹脂、ポリウレタン系樹脂
、ポリエステル系樹脂、エポキシ系樹脂、ポリエーテル
系樹脂、イソシアネート化合物、放射線硬化型樹脂など
従来から汎用されている結合剤樹脂がいずれも好適に使
用される。Here, the binder resin used in the undercoat layer includes vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, cellulose resin, polyurethane resin, polyester resin, epoxy resin, Any of the conventionally used binder resins such as polyether resins, isocyanate compounds, and radiation-curable resins can be suitably used.
【００１４】また、有機溶剤としては、アセトン、メチ
ルイソブチルケトン、メチルエチルケトン、シクロヘキ
サノン、トルエン、酢酸エチル、テトラヒドロフラン、
ジメチルホルムアミドなど従来一般に使用される有機溶
剤がいずれも単独で、或いは２種以上混合して使用され
る。[0014] Examples of organic solvents include acetone, methyl isobutyl ketone, methyl ethyl ketone, cyclohexanone, toluene, ethyl acetate, tetrahydrofuran,
Any conventionally commonly used organic solvent such as dimethylformamide may be used alone or in combination of two or more.
【００１５】本発明に於いて用いられる低分子イソシア
ネート化合物としては、２，４−トリレンジイソシアネ
ート、２，６−トリレンジイソシアネート、４，４′−
ジフェニルメタンジイソシアネート、ヘキサメチレンジ
イソシアネート、キシレンジイソシアネートなどのジイ
ソシアネート類および、これらジイソシアネート３モル
とトリオール１モルを反応させて得られる３官能性低分
子イソシアネート化合物等があり、市販品の多くのもの
を用いることができる（たとえば、日本ポリウレタン社
製コロネート２０３６，住友バイエル社製デスモジュー
ルＬ，デスモジュール１４，スミジュールＴ−８０，武
田薬品工業社製タケネートＤ１０２，タケネートＭ４０
３等がある。）。The low molecular weight isocyanate compounds used in the present invention include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-
There are diisocyanates such as diphenylmethane diisocyanate, hexamethylene diisocyanate, and xylene diisocyanate, and trifunctional low-molecular-weight isocyanate compounds obtained by reacting 3 moles of these diisocyanates with 1 mole of triol, and many commercially available products can be used. (For example, Coronate 2036 manufactured by Nippon Polyurethane Co., Ltd., Desmodur L, Desmodur 14, Sumidur T-80 manufactured by Sumitomo Bayer, Takenate D102, Takenate M40 manufactured by Takeda Pharmaceutical Company)
There is a third prize. ).
【００１６】[0016]
【発明の効果】本発明は非カーボンブラック系の下塗剤
を使用しているため電導率が下塗剤の粒径等によって変
動することがなく、安定した電磁変換特性を備えている
。そして、バリウムフェライト等の磁性層と緊密な接着
性を有する。[Effects of the Invention] Since the present invention uses a non-carbon black base coat, the conductivity does not vary depending on the particle size of the base coat, etc., and stable electromagnetic conversion characteristics are provided. It also has close adhesion to a magnetic layer such as barium ferrite.
【００１７】[0017]
【実施例】以下実施例によって本発明を説明する。[Examples] The present invention will be explained below with reference to Examples.
【００１８】[0018]
【実施例１】
（下塗層塗料の調製）
ヨウ化第１銅
７５重量部スルホン酸ソーダ含有
２５重量部ポ
リエステルウレタン（東洋紡バイロン）低分子ポリウレ
タン
２重量部（日本ポリウレタンコロネートＬ）
シクロヘキサノン
２００重量部上記組成物をボールミルに入れ
７２時間混合分散して、下塗塗料を調整した。この下塗
層用塗料を厚さ７５μｍのポリエチレンテレフタレート
フイルム両面に乾燥厚１．０μｍとなる様に塗布し、乾
燥し、１０ＭΩ／ｃｍ２ の表面抵抗を有する下塗層を
形成し、ついでカレンダー処理を施した。次に、このポ
リエチレンテレフタレートフイルム両面に、下記組成の
磁性塗料をその乾燥厚さが０．７μｍとなるように塗布
し、乾燥し、カレンダー処理を施した。しかる後ウェブ
状物を３．５″（インチ）円板状に打抜き、みがき処理
をした後、公知の方法に従って磁気ディスクを作成した
。[Example 1] (Preparation of undercoat layer paint) Cuprous iodide
Contains 75 parts by weight of sodium sulfonate
25 parts by weight polyester urethane (Toyobo Byron) low molecular weight polyurethane
2 parts by weight (Japan Polyurethane Coronate L) Cyclohexanone
200 parts by weight of the above composition was placed in a ball mill and mixed and dispersed for 72 hours to prepare an undercoat. This undercoat layer paint was applied to both sides of a 75 μm thick polyethylene terephthalate film to a dry thickness of 1.0 μm, dried to form an undercoat layer with a surface resistance of 10 MΩ/cm2, and then calendered. provided. Next, a magnetic paint having the following composition was applied to both sides of this polyethylene terephthalate film so that the dry thickness thereof was 0.7 μm, dried, and calendered. Thereafter, the web-like material was punched into a 3.5'' (inch) disk shape, polished, and then a magnetic disk was produced according to a known method.
【００１９】磁性塗料
Ｂａ−フェライト粉末
８０重量部ＢＥＴ比表面積 ５０ｍ２ ／
ｇ
板状比 ４．２
アルミナ（平均粒径０．３μｍ）
７重量部スルホン酸塩含有塩ビ・酢ビ樹脂
１０重量部（日本ゼオン ＭＲ１１０）
ポリウレタン樹脂
１０重量部低分子ポリウレタン
１０重量部（日
本ポリウレタン社コロネートＬ）
オレイルオレート
７重量部シクロヘキサノン
３００重量部ト
ルエン
１００重量部Magnetic paint Ba-ferrite powder
80 parts by weight BET specific surface area 50m2 /
g Plate ratio 4.2 Alumina (average particle size 0.3 μm)
PVC/vinyl acetate resin containing 7 parts by weight of sulfonate
10 parts by weight (Nippon Zeon MR110) Polyurethane resin
10 parts by weight low molecular weight polyurethane
10 parts by weight (Nippon Polyurethane Co., Ltd. Coronate L) Oleyl oleate
7 parts by weight cyclohexanone
300 parts by weight toluene
100 parts by weight
【００２０】[0020]
【比較例１】下記組成のカーボン含有組成の下塗層を実
施例１と同様にして製造（塗布）した後、実施例１の磁
性塗料を塗布して、実施例１と同様にして磁気ディスク
を製造した。
カーボンブラック
３０重量部（ライオンアクゾ社ケッチェ
ンブラック）スルホン酸ソーダ含
７０重量部ポリエスターウレ
タン（東洋紡バイロン）低分子ポリウレタン
２重量部（日
本ポリウレタン コロネート）
シクロヘキサノン
２００重量部[Comparative Example 1] After manufacturing (coating) a carbon-containing undercoat layer having the following composition in the same manner as in Example 1, the magnetic paint of Example 1 was applied, and the magnetic disk was coated in the same manner as in Example 1. was manufactured. Carbon black
30 parts by weight (Lion Akzo Ketjen Black) Contains sodium sulfonate
70 parts by weight Polyester urethane (Toyobo Byron) Low molecular weight polyurethane
2 parts by weight (Japan Polyurethane Coronate) Cyclohexanone
200 parts by weight
【００２１】[0021]
【実施例２及び実施例３】実施例１のヨウ化銅を硫化第
２銅及びヨウ化銀に代えて実施例１と同様にして磁気デ
ィスクを製造した。この結果を実施例２及び３とする。
結果を実施例１及び比較例１と共に表１に併記する。[Example 2 and Example 3] Magnetic disks were manufactured in the same manner as in Example 1 except that copper iodide in Example 1 was replaced with cupric sulfide and silver iodide. The results are referred to as Examples 2 and 3. The results are listed in Table 1 together with Example 1 and Comparative Example 1.
【００２２】[0022]
【表１】
＊）塗膜剥離強度は１ｃｍ巾に磁性塗膜をカットし、該
テープ状の磁性面に粘着テープを張りつけテープ状磁性
膜と、粘着テープを１８０°方向に１０ｃｍ／ｓｅｃで
引張った時のベースフイルムと、磁性層の剥離する時の
力＊＊）ディスクを８０℃１００ｈｒ熱処理し、潤滑剤
の移行加速テストを行った。[Table 1] *) Paint film peeling strength was measured by cutting a magnetic coating film into a 1 cm width, pasting an adhesive tape on the magnetic surface of the tape, and pulling the tape-shaped magnetic film and the adhesive tape at 10 cm/sec in a 180° direction. The base film and the force at which the magnetic layer peeled off**) were heat treated at 80°C for 100 hours, and a lubricant transfer acceleration test was conducted.
【００２３】しかる後３．５″フロッピーディスクドラ
イブ（ＮＥＣ１１３５ｃ）（ヘッドテンション８０ｇ，
回転速度１２００ｒｐｍ）にて、塗膜キズつきまでの時
間を測定した。After that, the 3.5″ floppy disk drive (NEC1135c) (head tension 80g,
The time until the coating film was scratched was measured at a rotation speed of 1200 rpm).
Claims (1)
る磁性層と、該支持体と該磁性層との間に設けられた導
電性下塗層とからなる磁気記録媒体であって、該下塗層
がヨウ化第一銅、ヨウ化銀、硫化鉛、赤鉄鉱、磁鉄鉱、
酸化インジウム及び硫化第二銅の群から選ばれた少なく
とも１種の金属化合物の導電性の充填剤と、有機結合剤
と、要すれば低分子イソシアネート化合物とを含むこと
からなる磁気記録媒体。1. A magnetic recording medium comprising a non-magnetic support, a magnetic layer containing ferromagnetic powder, and a conductive undercoat layer provided between the support and the magnetic layer. The undercoat layer contains cuprous iodide, silver iodide, lead sulfide, hematite, magnetite,
A magnetic recording medium comprising an electrically conductive filler of at least one metal compound selected from the group of indium oxide and cupric sulfide, an organic binder, and optionally a low molecular weight isocyanate compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3121764A JP2688296B2 (en) | 1991-04-25 | 1991-04-25 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3121764A JP2688296B2 (en) | 1991-04-25 | 1991-04-25 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04325914A true JPH04325914A (en) | 1992-11-16 |
| JP2688296B2 JP2688296B2 (en) | 1997-12-08 |
Family
ID=14819311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3121764A Expired - Fee Related JP2688296B2 (en) | 1991-04-25 | 1991-04-25 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2688296B2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59165239A (en) * | 1983-03-10 | 1984-09-18 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS6289219A (en) * | 1985-10-15 | 1987-04-23 | Toray Ind Inc | Film for magnetic recording medium |
| JPS63140420A (en) * | 1986-12-03 | 1988-06-13 | Victor Co Of Japan Ltd | Magnetic recording medium |
| JPH04192111A (en) * | 1990-11-27 | 1992-07-10 | Ube Ind Ltd | Magnetic recording medium |
| JPH04195819A (en) * | 1990-11-27 | 1992-07-15 | Victor Co Of Japan Ltd | Magnetic recording medium |
-
1991
- 1991-04-25 JP JP3121764A patent/JP2688296B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59165239A (en) * | 1983-03-10 | 1984-09-18 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPS6289219A (en) * | 1985-10-15 | 1987-04-23 | Toray Ind Inc | Film for magnetic recording medium |
| JPS63140420A (en) * | 1986-12-03 | 1988-06-13 | Victor Co Of Japan Ltd | Magnetic recording medium |
| JPH04192111A (en) * | 1990-11-27 | 1992-07-10 | Ube Ind Ltd | Magnetic recording medium |
| JPH04195819A (en) * | 1990-11-27 | 1992-07-15 | Victor Co Of Japan Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2688296B2 (en) | 1997-12-08 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |