JPS63249932A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS63249932A JPS63249932A JP62083006A JP8300687A JPS63249932A JP S63249932 A JPS63249932 A JP S63249932A JP 62083006 A JP62083006 A JP 62083006A JP 8300687 A JP8300687 A JP 8300687A JP S63249932 A JPS63249932 A JP S63249932A
- Authority
- JP
- Japan
- Prior art keywords
- back layer
- magnetic
- magnetic recording
- powder
- recording medium
- 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 39
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 12
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 8
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 238000004804 winding Methods 0.000 abstract description 9
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
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- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 239000011362 coarse particle Substances 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
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- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
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- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
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- DQEFEBPAPFSJLV-UHFFFAOYSA-N Cellulose propionate Chemical compound CCC(=O)OCC1OC(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C1OC1C(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C(COC(=O)CC)O1 DQEFEBPAPFSJLV-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
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- 235000010469 Glycine max Nutrition 0.000 description 1
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- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 1
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Landscapes
- 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〕
本発明は磁気記録媒体、特に走行耐久性と巻特性の優れ
た磁気記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording medium, and particularly to a magnetic recording medium with excellent running durability and winding characteristics.
従来、ビデオテープ、オーディオテープ、メモリーテー
プ、磁気ディスク等の磁気記録媒体としては、強磁性微
粉末を結合剤中に分散した磁性層を非磁性支持体の片方
の面に設け、他方の面にバック層を設けたものが広く用
いられている。Conventionally, in magnetic recording media such as video tapes, audio tapes, memory tapes, and magnetic disks, a magnetic layer in which fine ferromagnetic powder is dispersed in a binder is provided on one side of a non-magnetic support, and a magnetic layer is placed on the other side of a non-magnetic support. Those provided with a back layer are widely used.
このような磁気記録媒体の走行耐久性を改良するために
種々の対策が行われ、例えば、バック層中に100mμ
〜500mμ程度の粗粒子(例えばカーボンブランク)
を添加して表面性を若干粗くしたり、バック層中に潤滑
剤を添加する等により走行耐久性を改良することが行わ
れている。Various measures have been taken to improve the running durability of such magnetic recording media.
Coarse particles of ~500 mμ (e.g. carbon blank)
The running durability has been improved by adding a lubricant to make the surface rougher a little, or by adding a lubricant to the back layer.
しかしながら、上記の方法では走行耐久性は向上するが
、磁性層とバック層の滑りも良くなり、巻部れの原因と
なっている。従って、走行耐久性と共に巻特性を改良す
る対策が望まれている。However, although the above method improves the running durability, it also improves the slippage between the magnetic layer and the back layer, which causes curling. Therefore, measures are desired to improve running durability and winding characteristics.
従って、本発明の目的は、走行耐久性と共に巻特性が優
れた磁気記録媒体を提出することにある。Therefore, an object of the present invention is to provide a magnetic recording medium that has excellent running durability and winding characteristics.
本発明者らは、厚さが約2.5μm以下のハノク層中に
平均粒子サイズが1μm〜3μmの非磁性粉体を添加し
てへツク層表面に高さ約0.5μm〜2μmの突起を5
〜100個/1讃2形成させることにより上記目的を達
成し得ることを見出し、本発明を達成した。The present inventors added non-magnetic powder with an average particle size of 1 μm to 3 μm to the hex layer having a thickness of about 2.5 μm or less, and protrusions with a height of about 0.5 μm to 2 μm on the surface of the hex layer. 5
It has been found that the above object can be achieved by forming ~100 pieces/1 san2, and the present invention has been achieved.
すなわち、本発明は非磁性支持体の1方の面に強磁性微
粉末を分散した磁性層を、他方の面にバック層を設けて
なる磁気記録媒体において、該バック層の厚さが2.5
μm以下であり、且つ該バック層中に平均粒子サイズが
1μm〜3μmの非磁性粉末を、バック層表面に高さ0
.5μm〜2μmの突起が5〜100個/韮2形成され
るように含むことを特徴とする磁気記録媒体である。That is, the present invention provides a magnetic recording medium in which a magnetic layer in which fine ferromagnetic powder is dispersed is provided on one surface of a nonmagnetic support and a back layer is provided on the other surface, and the thickness of the back layer is 2.5 mm. 5
μm or less, and non-magnetic powder with an average particle size of 1 μm to 3 μm is placed in the back layer at a height of 0 on the surface of the back layer.
.. The magnetic recording medium is characterized in that it includes 5 to 100 protrusions of 5 μm to 2 μm/2 protrusions.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
本発明で用いられる強磁性微粉末としては、7−Fe2
O3、Co−含有r −FezO,、、FeOx (1
,33<X≦1.5)、Co−含有FeOx (1,3
3< x≦1.5)等の強磁性酸化鉄、二酸化クロム、
強磁性合金粉末等従来塗布型の磁気記録媒体に用いられ
ているものはすべて用いられる。The ferromagnetic fine powder used in the present invention includes 7-Fe2
O3, Co-containing r -FezO,,,FeOx (1
, 33<X≦1.5), Co-containing FeOx (1,3
3< x≦1.5), etc., ferromagnetic iron oxide, chromium dioxide,
All materials conventionally used in coated magnetic recording media, such as ferromagnetic alloy powder, can be used.
本発明の磁性層とバック層に使用される結合剤としては
、従来用いられている熱可塑性樹脂、熱硬化性樹脂、反
応型樹脂やこれらの混合物が用いられる。As the binder used in the magnetic layer and back layer of the present invention, conventionally used thermoplastic resins, thermosetting resins, reactive resins, and mixtures thereof can be used.
熱可塑性樹脂としては軟化温度が150℃以下、平均分
子量が10000〜300000、重合度が約50〜2
000程度のもので、例えば塩化ビニル共重合体、塩化
ビニル酢酸ビニル共重合体、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トリル共重合体、アク
リル酸エステルアクリロニトリル共重合体、アクリル酸
エステル塩化ビニリデン共重合体、アクリル酸エステル
スチレン共重合体、メタクリル酸エステルアクリロニト
リル共重合体、メタクリル酸エステル塩化ビニリデン共
重合体、メタクリル酸エステルスチレン共重合体、ウレ
タンエラストマー、ナイロン−シリコン系樹脂、ニトロ
セルロース−ポリアミド樹脂、ポリフッカビニル、塩化
ビニリデンアクリロニトリル共重合体、ブタジェンアク
リロニトリル共重合体、ポリアミド樹脂、ポリビニルブ
チラール、セルロース誘導体(セルロースアセテートブ
チレート、セルロースダイアセテート、セルローストリ
アセテート、セルロースプロピオネート、ニトロセルロ
ース等)スチレンブタジェン共重合体、ポリエステル樹
脂、クロロビニルエーテルアクリル酸エステル共重合体
、アミノ樹脂、各種の合成ゴム系の熱可塑性樹脂及びこ
れらの混合物等が使用される。The thermoplastic resin has a softening temperature of 150°C or less, an average molecular weight of 10,000 to 300,000, and a degree of polymerization of about 50 to 2.
For example, vinyl chloride copolymer, vinyl chloride vinyl acetate copolymer, vinyl chloride vinylidene chloride copolymer, vinyl chloride acrylonitrile copolymer, acrylic acid ester acrylonitrile copolymer, acrylic acid ester vinylidene chloride copolymer. Polymer, acrylic acid ester styrene copolymer, methacrylic acid ester acrylonitrile copolymer, methacrylic acid ester vinylidene chloride copolymer, methacrylic acid ester styrene copolymer, urethane elastomer, nylon-silicon resin, nitrocellulose-polyamide resin , polyfukkavinyl, vinylidene chloride acrylonitrile copolymer, butadiene acrylonitrile copolymer, polyamide resin, polyvinyl butyral, cellulose derivatives (cellulose acetate butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, nitrocellulose, etc.) styrene Butadiene copolymers, polyester resins, chlorovinyl ether acrylate copolymers, amino resins, various synthetic rubber-based thermoplastic resins, and mixtures thereof are used.
熱硬化性樹脂又は反応型樹脂としては塗布液の状態では
200000以下の分子量であり、塗布、乾燥後に加熱
することにより、縮合、付加等の反応により分子量は無
限大のものとなる。又、これらの樹脂のなかで、樹脂が
熱分解するまでの間に軟化又は溶融しないものが好まし
い。具体的には例えばフェノール樹脂、フェノキシ樹脂
、エポキシ樹脂、ポリウレタン硬化型樹脂、尿素樹脂、
メラミン樹脂、アルキッド樹脂、シリコン樹脂、アクリ
ル系反応樹脂、エポキシ−ポリアミド樹脂、ニトロセル
ロースメラミン樹脂、高分子量ポリエステル樹脂とイソ
シアネートプレポリマーの混合物、メタクリル酸塩共重
合体とジイソシアネートプレポリマーの混合物、ポリエ
ステルポリオールとポリイソシアネートとの混合物、尿
素ホルムアルデヒド樹脂、低分子量グリコール/高分子
量ジオール/トリフェニルメタントリイソシアネートの
混合物、ポリアミン樹脂及びこれらの混合物等である。The thermosetting resin or reactive resin has a molecular weight of 200,000 or less in the state of a coating liquid, and when heated after coating and drying, the molecular weight becomes infinite due to reactions such as condensation and addition. Also, among these resins, those that do not soften or melt before the resin is thermally decomposed are preferred. Specifically, for example, phenol resin, phenoxy resin, epoxy resin, polyurethane curable resin, urea resin,
Melamine resins, alkyd resins, silicone resins, acrylic reactive resins, epoxy-polyamide resins, nitrocellulose melamine resins, mixtures of high molecular weight polyester resins and isocyanate prepolymers, mixtures of methacrylate copolymers and diisocyanate prepolymers, polyester polyols and polyisocyanate, urea formaldehyde resin, mixture of low molecular weight glycol/high molecular weight diol/triphenylmethane triisocyanate, polyamine resin, and mixtures thereof.
本発明においては、磁性層に通常用いられている添加剤
、例えば、潤滑剤、帯電防止剤、研磨剤等を必要により
添加してもよい。In the present invention, additives commonly used in magnetic layers, such as lubricants, antistatic agents, abrasives, etc., may be added as necessary.
本発明の特徴はバック層にある。バック層の厚さは乾燥
厚で2.5μm以下、好ましくは2μm以下で、平均粒
子サイズ1μm〜3μm、好ましくは1.5μm〜2.
5μmの非磁性粉体(粗粒子フィラー)を含んでいる。The feature of the present invention lies in the back layer. The back layer has a dry thickness of 2.5 μm or less, preferably 2 μm or less, and an average particle size of 1 μm to 3 μm, preferably 1.5 μm to 2.0 μm.
Contains 5 μm non-magnetic powder (coarse particle filler).
平均粒子サイズが1μmより小さいと目的とする突起を
形成することができず、また3μmより大きいとバック
層中に粒子を保持できず、粉落ちを生じドロツプアウト
を増加させる。If the average particle size is smaller than 1 μm, the desired protrusions cannot be formed, and if the average particle size is larger than 3 μm, the particles cannot be retained in the backing layer, causing powder falling and increasing dropout.
このような非磁性粉体をバック層中に、バック層表面に
高さ0.5μm〜2μmの突起が5〜100個/ 11
2形成されるように添加する。Such non-magnetic powder is used in the back layer, and 5 to 100 protrusions with a height of 0.5 μm to 2 μm are formed on the surface of the back layer.
2. Add so that it forms.
このような突起を形成させるには、強磁性微粉末(及び
他の粉末類が存在する場合にはそれらの粉末類との総和
)の0.1〜20重量%、好ましくは1.0〜15重量
%、更に好ましくは5.0〜15重量%添加する。In order to form such protrusions, 0.1 to 20% by weight, preferably 1.0 to 15% by weight of the ferromagnetic fine powder (and the sum of other powders if present) is used. It is added in an amount of 5.0 to 15% by weight, more preferably 5.0 to 15% by weight.
添加量が0.1重量%より少ないと目的とする突起が形
成されず、20重量%より多いとバック層の磁性層への
りの影響が無視できなくなり電磁変換特性が低下する
。If the amount added is less than 0.1% by weight, the desired protrusions will not be formed, and if it is more than 20% by weight, the influence of the adhesive on the magnetic layer of the back layer cannot be ignored and the electromagnetic conversion characteristics will deteriorate.
このようにバック層表面に適度の突起が形成されると、
走行系において各部位での摩擦力が低下し、走行耐久性
が増し、また、テープが巻かれた時に、バック層表面の
突起が磁性層側にくい込むことによって巻特性が改良さ
れ巻きずれ等を防止しているものと推定される。When appropriate protrusions are formed on the back layer surface in this way,
In the running system, the frictional force at each part is reduced, increasing running durability, and when the tape is wound, the protrusions on the back layer surface sink into the magnetic layer, improving the winding characteristics and preventing winding misalignment. It is presumed that this is being prevented.
本発明で用いられる粗粒子フィラーとしては、BaSO
4、CaCO3,5i02、ヘンゾグアナミン樹脂、ヘ
ントナイト等の粉末が用いられる。The coarse particle filler used in the present invention includes BaSO
4. Powders such as CaCO3,5i02, henzoguanamine resin, and hentonite are used.
なお、バック層には、必要に応じカーボンブラックその
他の添加剤を加えることができる。Note that carbon black and other additives can be added to the back layer as necessary.
本発明で磁性層及びバック層を形成するのに上記各成分
を分散、混練して塗布する際に使用する有機溶媒として
は、任意の比率でアセトン、メチルエチルケトン、メチ
ルイソブチルケトン、シクロヘキサノン、イソホロン、
テトラヒドロフラン等のケトン系;メタノール、エタノ
ール、プロパツール、ブタノール、イソブチルアルコー
ル、イソプロピルアルコール、メチルシクロヘキサノー
ルなどのアルコール系;酢酸メチル、酢酸エチル、酢酸
ブチル、酢酸イソブチル、酢酸イソプロピル、乳酸エチ
ル、酢酸グリコールモノエチルエーテル等のエステル系
;ジエチルエーテル、テトラヒドロフラン、グリコール
ジメチルエーテル、グリコールモノエチルエーテル、ジ
オキサンなどのエーテル系;ベンゼン、トルエン、キシ
レン、クレゾール、クロルヘンゼン、スチレンなどのタ
ール系(芳香族炭化水素);メチレンクロライド、エチ
レンクロライド、四塩化炭素、クロロホルム、エチレン
クロルヒドリン、ジクロルベンゼン等の塩素化炭化水素
、N、N−ジメチルホルムアルデヒドヘキサン等のもの
が使用できる。In the present invention, the organic solvent used when dispersing, kneading, and coating the above-mentioned components to form the magnetic layer and back layer includes acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone,
Ketones such as tetrahydrofuran; alcohols such as methanol, ethanol, propatool, butanol, isobutyl alcohol, isopropyl alcohol, methylcyclohexanol; methyl acetate, ethyl acetate, butyl acetate, isobutyl acetate, isopropyl acetate, ethyl lactate, glycol monoacetate Ester systems such as ethyl ether; Ether systems such as diethyl ether, tetrahydrofuran, glycol dimethyl ether, glycol monoethyl ether, and dioxane; Tar systems (aromatic hydrocarbons) such as benzene, toluene, xylene, cresol, chlorhenzene, and styrene; methylene chloride , chlorinated hydrocarbons such as ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin, and dichlorobenzene, and N,N-dimethylformaldehyde hexane.
本発明で用いる支持体の素材としてはポリエチレンテレ
フタレート、ポリエチレンナフタレート等のポリエステ
ル類、ポリプロピレン等ポリオレフィン類、セルロール
トリアセテート、セルロースダイアセテート等のセルロ
ース誘導体、ポリ塩化ビニル等のビニル系樹脂類、ポリ
カーボネート、ポリアミド、ポリスルホン等のプラスチ
ックかあげられる。Materials for the support used in the present invention include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate and cellulose diacetate, vinyl resins such as polyvinyl chloride, polycarbonate, Examples include plastics such as polyamide and polysulfone.
本発明の磁気記録媒体は上記支持体に前記夫々の成分を
塗布、乾燥して磁性層及びバック層を設けることによっ
て得られる。バック層を設けるのは磁気記録層の前であ
っても後であってもよい。The magnetic recording medium of the present invention can be obtained by applying each of the above components to the support and drying to provide a magnetic layer and a back layer. The back layer may be provided before or after the magnetic recording layer.
てお、磁気記録層の場合は、塗布後、磁場配向しなから
乾燥し、必要に応じてカレンダー処理等の表面処理を施
す。In the case of a magnetic recording layer, after coating, it is dried without being oriented in a magnetic field, and if necessary, surface treatment such as calendering is performed.
次に本発明の実施例および比較例を示す。 Next, Examples and Comparative Examples of the present invention will be shown.
各側において「部」は「重量部」を示す。On each side, "parts" refer to "parts by weight."
厚さ20μmのポリエチレンテレフタレートヘース(非
磁性支持体)の表面に以下に記載する組成および方法で
調製した磁性塗料を乾燥後の厚さが6.0μmとなるよ
うに塗布し、乾燥させた。A magnetic paint prepared according to the composition and method described below was applied to the surface of a polyethylene terephthalate hese (non-magnetic support) having a thickness of 20 μm so that the thickness after drying was 6.0 μm, and was dried.
次いで、磁性塗料の塗布されていないポリエチレンテレ
フタレート面に乾燥後の厚さが2.0μmになるように
以下に記載する組成および方法で調製したバック層塗布
液を塗布した。Next, a back layer coating solution prepared according to the composition and method described below was applied to the polyethylene terephthalate surface to which the magnetic paint was not applied so that the thickness after drying was 2.0 μm.
塗布後、乾燥工程および表面平滑化処理を行ない、ただ
ちに巻き取りを行なった。After coating, a drying process and surface smoothing treatment were performed, and the film was immediately wound up.
巻き取られた原反をその状態で40℃の温度で48時間
加熱硬化処理を行ない、次いでこの原反を1インチ幅に
スリットし、1インチビデオテープを得た。The rolled original fabric was heat-cured in that state at a temperature of 40° C. for 48 hours, and then this original fabric was slit into 1-inch widths to obtain 1-inch video tapes.
1目生JL料」L或5
Co含有r =Fe203
100部(比表面積:35r+?/g
粉末のHc : 6500e)
塩化ビニル/酢酸ビニル/無水
マレイン酸共重合体 15部(MP
R−TM、日信化学■製)
ニトロセルロース 5部ポリ
ウレタン樹脂 6部(クリス
ボン6119、
大日本インキ化学工業■製)
カーボンブランク 3部(平
均粒子サイズ:20mμ)
Crz03 3
部オレイン酸 2部
ステアリン酸ブチル 1部ステ
アリン酸 0.5部脂肪酸
変性シリコーン 2部オレイン酸ア
ミド 0.5部酢酸ブチル
240部メチルエチルケ
トン 120部上記の組成物をボ
ールミルに入れ、48時間混線分敗した後、ポリイソシ
アネート化合物(コロネートし−75、日本ポリウレタ
ン■製)10部を加えて、さらに1時間混線分散を行な
った。混線分散後、1μmの平均孔径を有するフィルタ
を用いて濾過し、磁性塗料とした。1st raw JL material L or 5 Co content r = Fe203
100 parts (Specific surface area: 35r+?/g Powder Hc: 6500e) Vinyl chloride/vinyl acetate/maleic anhydride copolymer 15 parts (MP
R-TM, Nissin Chemical Co., Ltd.) Nitrocellulose 5 parts Polyurethane resin 6 parts (Crisbon 6119, Dainippon Ink Chemical Co., Ltd.) Carbon blank 3 parts (Average particle size: 20 mμ) Crz03 3
Part oleic acid 2 parts Butyl stearate 1 part Stearic acid 0.5 parts Fatty acid modified silicone 2 parts Oleic acid amide 0.5 parts Butyl acetate
240 parts Methyl ethyl ketone 120 parts The above composition was placed in a ball mill and mixed and dispersed for 48 hours, then 10 parts of a polyisocyanate compound (Coronate Shi-75, manufactured by Nippon Polyurethane) was added and mixed and dispersed for another hour. . After crosstalk dispersion, it was filtered using a filter having an average pore size of 1 μm to obtain a magnetic paint.
バック層塗布液組成
カーボンブランク(I )50部
(平均粒子径:30mμ)
カーボンブラック (II) 5
0部(平均粒子径: 300mμ)
オレイン酸 0.5部オ
レイン酸アミド 0.5部シ
クロへキサノン 40部粗粒子
フィラー 第1表に記す。Back layer coating liquid composition Carbon blank (I) 50 parts (average particle size: 30 mμ) Carbon black (II) 5
0 parts (average particle size: 300 mμ) Oleic acid 0.5 parts Oleic acid amide 0.5 parts Cyclohexanone 40 parts Coarse particle filler Table 1 shows.
メチルエチルケトン 500部上
記の組成物をボールミルに入れ、70時間混純分t4’
lした後、ポリイソシアネート化合物(コロネートし−
75、日本ポリウレタン側製) 19.1部を加えて、
さらに1時間混線分散を行なった。混線分散後、3μm
の平均孔径を有するフィルタを用いて濾過し、バック層
塗布液とした。Methyl ethyl ketone 500 parts The above composition was placed in a ball mill and mixed for 70 hours at t4'
After drying, add a polyisocyanate compound (coronate).
75, made by Japan Polyurethane), add 19.1 parts,
Crosstalk was further dispersed for 1 hour. After crosstalk dispersion, 3μm
The solution was filtered using a filter having an average pore size of , to obtain a back layer coating solution.
得られた試料について次の如き評価テストを行い得られ
た結果を第1表に示した。The following evaluation tests were conducted on the obtained samples, and the results are shown in Table 1.
生立1大豆
第1図に示す装置で10m7秒の速度でテープ1を50
回走行させ、バック層を観察し、傷の程度で4つのラン
クに分けた。なお、同装置の2本のロール間の距離は5
0cm、SOSボール2の径は0.5 cmであった。1 soybean after 50 minutes
The back layer was observed and divided into four ranks based on the degree of scratches. The distance between the two rolls of the same device is 5
The diameter of SOS ball 2 was 0.5 cm.
A:全く傷つかない。A: It won't hurt at all.
B:傷が2〜3本人る。B: There are 2 to 3 injuries.
C:傷が4本以上入り、削れ粉がわずかにボールに付着
する。C: There are four or more scratches and a slight amount of shavings adheres to the ball.
D:傷が4本以上入り、削れ粉がかなりポールに付着す
る。D: There are four or more scratches and a considerable amount of shavings adheres to the pole.
11止
へmpex社製VTRrVPR−3Jにて50倍速でR
EWした時に巻端面の状態を以下の様に評価する。R to 11th stop at 50x speed with mpex VTRrVPR-3J
The condition of the winding end surface during EW is evaluated as follows.
A:端面がきれいにそろっている。A: The end faces are neatly aligned.
B:@面がザラザラしているが飛び出しはない。B: The @ surface is rough, but there are no protrusions.
C:1〜2カ所飛び出しが出る。C: There are protrusions in one or two places.
D:3カ所以上飛び出しが出る。D: There are protrusions in three or more places.
ふ二S/N北
BTS規格に準拠して測定した。なお表記した値は標準
テープ(比較例1で調製した1インチビデオテープ)の
出力レベルをOdBとしたときの値である。Measured in accordance with the Fuji S/N North BTS standard. Note that the values shown are values when the output level of the standard tape (1-inch videotape prepared in Comparative Example 1) is OdB.
深」E玖
東京精密■製三次元表面粗形状測定ユニット(サーフコ
ム300Bシステム)を用い、高さ×縦×横= 200
0 X 100 X 200の倍率で三次元表面粗さチ
ャートを描き、その中から1μm〜2μmの突起数を読
みとる。Using a three-dimensional surface roughness measurement unit (Surfcom 300B system) manufactured by Tokyo Seimitsu ■, height x length x width = 200
A three-dimensional surface roughness chart is drawn at a magnification of 0 x 100 x 200, and the number of protrusions of 1 μm to 2 μm is read from the chart.
第1表に示す結果から明らかなように、本発明によるバ
ック層を設けた場合には走行耐久性及び巻特性共に優れ
、且つ磁気特性(C3/N)が優れた磁気記録媒体が得
られる。As is clear from the results shown in Table 1, when the back layer according to the present invention is provided, a magnetic recording medium having excellent running durability and winding characteristics as well as excellent magnetic properties (C3/N) can be obtained.
【図面の簡単な説明】
第1図は磁気記録媒体の走行耐久性をテストする装置の
1例を示す略図である。
1・・・テープ 2・・・SUSポール第
1 図
手続補正書
昭和62年5月20日BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an example of an apparatus for testing running durability of a magnetic recording medium. 1... Tape 2... SUS pole No.
1 Amendment to Figure Procedures May 20, 1986
Claims (1)
た磁性層を、他方の面にバック層を設けてなる磁気記録
媒体において、該バック層の厚さが2.5μm以下であ
り、かつ該バック層中に平均粒子サイズが1μm〜3μ
mの非磁性粉末を、バック層表面に高さ1μm〜2μm
の突起が30〜200個/mm^2形成されるように含
むことを特徴とする磁気記録媒体。(1) In a magnetic recording medium comprising a magnetic layer in which fine ferromagnetic powder is dispersed on one surface of a non-magnetic support and a back layer on the other surface, the thickness of the back layer is 2.5 μm or less. and the average particle size is 1 μm to 3 μm in the back layer.
m non-magnetic powder on the back layer surface at a height of 1 μm to 2 μm.
A magnetic recording medium comprising 30 to 200 protrusions/mm^2 formed therein.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62083006A JPH0697501B2 (en) | 1987-04-06 | 1987-04-06 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62083006A JPH0697501B2 (en) | 1987-04-06 | 1987-04-06 | Magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63249932A true JPS63249932A (en) | 1988-10-17 |
JPH0697501B2 JPH0697501B2 (en) | 1994-11-30 |
Family
ID=13790164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62083006A Expired - Fee Related JPH0697501B2 (en) | 1987-04-06 | 1987-04-06 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0697501B2 (en) |
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