JP2568821B2 - Manufacturing method of magnetic recording medium - Google Patents
Manufacturing method of magnetic recording mediumInfo
- Publication number
- JP2568821B2 JP2568821B2 JP61054992A JP5499286A JP2568821B2 JP 2568821 B2 JP2568821 B2 JP 2568821B2 JP 61054992 A JP61054992 A JP 61054992A JP 5499286 A JP5499286 A JP 5499286A JP 2568821 B2 JP2568821 B2 JP 2568821B2
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- JP
- Japan
- Prior art keywords
- layer
- coating
- layers
- recording medium
- wet
- Prior art date
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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の製造方法、特に同時又は逐次
湿潤重層塗布方式（以下、ウエツト・オン・ウエツト塗
布方式という）による磁気記録媒体の製造方法に関する
ものである。The present invention relates to a method of manufacturing a magnetic recording medium, and more particularly to a method of manufacturing a magnetic recording medium by a simultaneous or sequential wet multilayer coating method (hereinafter, referred to as a wet-on-wet coating method). It is about the method.
磁気記録媒体の層構成は、一般に下塗層の上に磁性
層、必要に応じその上に第２の磁性層があり、その反対
面には下塗層の上にバツク層がある。又近来中間層（カ
ーボンブラツク含有層）の上に磁性層、必要に応じてカ
ーボンブラツク含有層の下に下塗層が設けられている磁
気記録媒体も製造されるようになつた。The layer structure of the magnetic recording medium is generally such that a magnetic layer is provided on the undercoat layer, a second magnetic layer is provided on the magnetic layer if necessary, and a back layer is provided on the undercoat layer on the opposite side. In recent years, a magnetic recording medium having a magnetic layer on an intermediate layer (carbon black-containing layer) and, if necessary, an undercoat layer below the carbon black-containing layer has also been manufactured.
これらの層を構成させるための従来の塗布方法は、一
層づゝ塗布乾燥工程を経て積み重ねる方法である。所謂
ウエツト・オン・ドライ塗布方式である。上述の塗布方
式では一層単独で塗布する場合は塗布液組成としては単
に溶媒に溶質が溶解すればよいが、しかし一方すでに塗
布、乾燥された層の上に次の層を積み重ねて塗布する場
合、これから塗布しようとする上層の塗布液の溶媒が下
層に対し溶解性があることは好ましくなく、従つて上層
塗布液の溶媒としては下層に対する溶解性の少ない塗布
液組成が選定されていた。The conventional coating method for forming these layers is a method in which the layers are stacked one after another through a coating and drying step. This is a so-called wet-on-dry coating method. In the above-mentioned coating method, when applying one layer alone, the solute may be simply dissolved in a solvent as a coating liquid composition, but on the other hand, when the next layer is applied on the already applied and dried layer, It is not preferable that the solvent of the upper layer coating solution to be coated has solubility in the lower layer. Therefore, a coating solution composition having low solubility in the lower layer has been selected as the solvent of the upper layer coating solution.
しかるに、上記のような塗布液組成をウエツト・オン
・ウエツト塗布方式の塗布液組成として用いた場合、即
ち、乾燥されてない湿潤状態にある層の上に次なる層を
重ねて塗布する場合は、該重畳層の乾燥された塗布面を
観察すると、亀甲状の模様の中に半透明は核があつた
り、いたるところに密集して透明な“ブツ”が発生する
場合がある。これらの異物を分析した結果重畳層のいず
れかの、又は各層の溶質（バインダー類）が析出凝固し
たものであることが判明した。However, when the coating solution composition as described above is used as a coating solution composition of a wet-on-wet coating method, that is, when the next layer is applied over a layer that is not dried and is in a wet state. When the dried coating surface of the superposed layer is observed, a translucent nucleus may be formed in the turtle-shaped pattern, or a transparent "puff" may be generated densely everywhere. As a result of analyzing these foreign substances, it was found that solutes (binders) in any one of the superposed layers or in each layer were precipitated and solidified.
上記のような面質では、製品とすることができず問題
であつた。In the above aspects, it was impossible to produce a product, which was a problem.
本発明の目的は上記したウエツト・オン・ウエツト塗
布方式における問題点を解決し、表面性の良い塗布面を
効率よく形成することができる磁気記録媒体の製造方法
を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the wet-on-wet coating method and to provide a method of manufacturing a magnetic recording medium capable of efficiently forming a coated surface having good surface properties.
又本発明の目的は異つた性質の層、例えば下塗層、バ
ツク層、磁性層等の組合わさつた塗布をウエツト・オン
・ウエツト塗布方式で重畳塗布を行い、又同時重畳塗布
による薄層・高速塗布によるお磁気記録媒体の高品質化
及び原価低減を実現することにある。It is also an object of the present invention to provide a combination of layers having different properties, for example, an undercoat layer, a back layer, a magnetic layer, etc., in a superimposed manner by a wet-on-wet coating method, and a thin layer by simultaneous superimposition coating. An object of the present invention is to realize high quality and cost reduction of a magnetic recording medium by high-speed coating.
本発明者らは、ウエツト・オン・ウエツト塗布方式の
際の各塗布液組成について鋭意検討した結果、ウエツト
・オン・ウエツトで塗布液が２層重なつた時、各層の境
界では有機溶媒同志、溶質同志の移動が生じ、又重畳層
が乾燥される過程において各層異つた溶媒であれば、各
々異つた蒸発速度、拡散速度により刻々その混合比を変
えながら濃縮して行く、この場合各々の溶質（バインダ
ー類）は刻々変化する数種の溶媒の混合比とその含有量
に対し溶解していることが必要である。The present inventors have conducted intensive studies on the composition of each coating solution in the wet-on-wet coating method. As a result, when the coating solutions were overlapped by two layers in the wet-on-wet mode, the organic solvent at the boundary of each layer, In the process of solute migration and the drying of the superimposed layer, if different solvents are used for each layer, they are concentrated while changing their mixing ratios according to different evaporation rates and diffusion rates. In this case, each solute is concentrated. It is necessary that the (binders) be dissolved with respect to the mixing ratio and the content of several kinds of solvents that change every moment.
以上の見解に立つて、各種溶媒と溶質の相互溶解性の
ある組み合わせを実現することにより、前記問題点を解
決するに致つた。In view of the above, it has been found that the above problems have been solved by realizing a mutually soluble combination of various solvents and solutes.
即ち、本発明は、可撓性支持体上に塗布された複数の
層より形成される磁気記録媒体の製造方法において、隣
接した複数層の各塗布液組成の溶媒は隣接層の溶媒及び
溶質に対し相互溶解性を有し、かつ複数層の塗布液の全
溶質の体積に対し全溶媒の体積が３倍の濃度になる迄該
相互溶解性が保たれ、該複数層の塗布液を湿潤状態で同
時又は可及的速やかに重畳して塗布し、乾燥することを
特徴とする磁気記録媒体の製造方法である。That is, the present invention relates to a method for producing a magnetic recording medium formed from a plurality of layers applied on a flexible support, wherein the solvent of each coating solution composition of the adjacent layers is different from the solvent and solute of the adjacent layer. On the other hand, it has mutual solubility, and the mutual solubility is maintained until the volume of the total solvent becomes three times the concentration of the total solute of the coating solution of the plurality of layers, and the coating solution of the plurality of layers is in a wet state. And superimposing and drying simultaneously or as quickly as possible, followed by drying.
尚本発明は隣接した複数層として、複数層の磁性層に
おいては勿論であるが、下塗層とバツク層、下塗層と磁
性層、中間層と磁性層等の異つた質の塗布液の組合わせ
においてもその結果を発揮するものである。ここで下塗
層は中間層、磁性層、又はバック層と支持体との密着を
改良するための層は結合剤が含まれている。又中間層は
磁性層とは別異の機能、例えば帯電防止のためカーボン
ブラツク又は帯電性樹脂等と結合剤を含む層をいう。In the present invention, as a plurality of adjacent layers, it is needless to say that a plurality of magnetic layers may be used, but different types of coating liquids such as an undercoat layer and a back layer, an undercoat layer and a magnetic layer, and an intermediate layer and a magnetic layer. The result is demonstrated in combination. Here, the undercoat layer contains a binder in the intermediate layer, the magnetic layer, or the layer for improving the adhesion between the back layer and the support. The intermediate layer is a layer having a function different from that of the magnetic layer, for example, a layer containing a carbon black or a chargeable resin and a binder for preventing charge.
本発明において用いられる可撓性支持体としては、ポ
リエチレンテレフタレート（P.E.T）、ポリエチレンナ
フタレート等のポリエステル類、ポリプロピレン等のオ
レフイン等、セルロースアセテート等のセルロース誘導
体等のプラスチツクフイルムが用いられる。As the flexible support used in the present invention, plastic films such as polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate, olefins such as polypropylene, and cellulose derivatives such as cellulose acetate are used.
本発明の磁性層に用いられる強磁性微粉末としては、
γ‐Fe2O3,Co-含有γ‐Fe2O3,Fe3O4,Co-含有Fe3O4,Cr
O2,Co-Ni-Fe合金,Co-Ni-P合金公知の強磁性微粉末が用
いられる。これらの強磁性微粉末をバインダーや他の添
加剤と共に有機溶媒に分散して磁性液として塗布する。
これらのバインダー、溶剤、添加剤や、調液方法等に関
しては特公昭56-26890号公報等に詳しく記載されてい
る。又バツク層用としてはカーボンブラツク、炭酸カル
シウム等が分散物として用いられる。As the ferromagnetic fine powder used in the magnetic layer of the present invention,
γ-Fe 2 O 3 , Co-containing γ-Fe 2 O 3 , Fe 3 O 4 , Co-containing Fe 3 O 4 , Cr
O 2 , a Co—Ni—Fe alloy, or a Co—Ni—P alloy known ferromagnetic fine powder is used. These ferromagnetic fine powders are dispersed in an organic solvent together with a binder and other additives and applied as a magnetic liquid.
These binders, solvents, additives, liquid preparation methods and the like are described in detail in JP-B-56-26890. For the back layer, carbon black, calcium carbonate or the like is used as a dispersion.
溶質（バインダー）としては磁性層、バツク層、中間
層用として具体的にはポリエステル、ニトロセルロー
ズ、塩化ビニリデン、塩化ビニル・酢酸ビニル共重合体
（以下塩・酢ビと称す）が、下塗層用として、塩化ビニ
リデン／アクリルニトリル共重合体、塩化ビニリデン／
アクリル酸エステル共重合体、エポキシ樹脂、ブタジエ
ン／アクリロニトリル共重合体、メタクリレート共重合
体、ポリエステル樹脂、塩化ビニル樹脂、ポリウレタン
エラストマー、ポリアミド電子線硬化性アクリルオリゴ
マー、又は電子線硬化性アクリルプレポリマー及び特開
昭59-19230号公報記載の無定形飽和ポリエステル等があ
る。As the solute (binder), for the magnetic layer, back layer, and intermediate layer, specifically, polyester, nitrocellulose, vinylidene chloride, vinyl chloride / vinyl acetate copolymer (hereinafter, referred to as salt / vinyl acetate), and undercoat layer For use, vinylidene chloride / acrylonitrile copolymer, vinylidene chloride /
Acrylic ester copolymer, epoxy resin, butadiene / acrylonitrile copolymer, methacrylate copolymer, polyester resin, vinyl chloride resin, polyurethane elastomer, polyamide electron beam-curable acrylic oligomer, or electron beam-curable acrylic prepolymer Amorphous saturated polyesters described in JP-A-59-19230 and the like.
溶媒としては、メチルエチルケトン（MEK）シクロヘ
キサノン等のケトン類、酢酸ブチル、酢酸エチル等のエ
ステル類、トルエン、キシレン等の芳香族溶剤、メチレ
ンクロライド、エチレンクロライドの塩素系溶剤がよく
用いられる。As the solvent, ketones such as methyl ethyl ketone (MEK) cyclohexanone, esters such as butyl acetate and ethyl acetate, aromatic solvents such as toluene and xylene, and chlorinated solvents such as methylene chloride and ethylene chloride are often used.
本発明で塗布液を湿潤状態で重畳して塗布する方法、
即ち、ウエツト・オン・ウエツト塗布方式とは、初め一
層を塗布した後に湿潤状態で可及的速やかに次の層をそ
の上に塗布する所謂逐次塗布方法、及び多層同時にエク
ストルージヨン塗布方式で塗布する方法等がある。A method of applying the coating liquid in a superimposed manner in a wet state in the present invention,
In other words, the wet-on-wet coating method is a so-called sequential coating method in which one layer is first coated and then the next layer is coated thereon as soon as possible in a wet state, and a multi-layer simultaneous extrusion coating method. There is a method to do.
尚本発明では、塗布直後の溶剤の体積は溶質の体積の
約10倍位迄になるので、その時は隣接する複数層の相互
溶解性があつても、乾燥が進んで溶媒が蒸発し、複数層
の全溶媒の体積が全溶質の体積の３倍位に濃縮される
迄、好ましくは２倍位迄前記相互溶解性が保たれること
が望ましい。溶液濃度が高くなつた時にも溶質のゲル化
が生じないことが望ましい。In the present invention, since the volume of the solvent immediately after coating is about 10 times the volume of the solute, even if the adjacent layers have mutual solubility, drying proceeds and the solvent evaporates. It is desirable that the mutual solubility is maintained until the volume of the total solvent in the layer is concentrated to about 3 times the volume of the total solute, preferably up to about 2 times. It is desirable that the solute does not gel even when the solution concentration becomes high.
以下、本発明を２層のウエツト・オン・ウエツト塗布
方式の一実施例により詳細に説明する。Hereinafter, the present invention will be described in detail with reference to an embodiment of a two-layer wet-on-wet coating method.
実施例及び比較例として扱つた塗布液の溶媒（有機溶
剤）と溶質（バインダー）は表−１に示す。ウエツト・
オン・ウエツト塗布方式としては特願昭59-259941号に
示した磁気記録媒体塗布方法を使用した。Table 1 shows the solvents (organic solvents) and solutes (binders) of the coating liquids treated as examples and comparative examples. Wet
As an on-wet coating method, a magnetic recording medium coating method disclosed in Japanese Patent Application No. 59-259941 was used.
まず第１図により本発明の内容を説明する。連続的に
走行するポリエチレンテレフタレートの可撓性支持体１
に塗布機（Ａ）３にて塗布液（ａ）２をプレコートし、
その直後スムージングロール４にて該塗布面を平滑化
し、該塗布液２が湿潤状態にある状態で別の押し出し塗
布機（Ｂ）６により次なる塗布液（ｂ）５を塗布する方
法を用いた。First, the contents of the present invention will be described with reference to FIG. Polyethylene terephthalate flexible support 1 running continuously
Is precoated with a coating liquid (a) 2 by a coating machine (A) 3,
Immediately thereafter, a method was used in which the coating surface was smoothed by a smoothing roll 4 and the next coating solution (b) 5 was applied by another extruder (B) 6 while the coating solution 2 was in a wet state. .
表−１に示した各種塗布液（ａ）−1,2,3,及び（ｂ）
−1,2,3,の組み合わせによる乾燥後の塗布面評価を行つ
た。析出物発生状況−顕微鏡観察結果を表−２に示す。Various coating liquids shown in Table-1 (a) -1, 2, 3, and (b)
The coated surface after drying was evaluated by the combination of -1, 2, and 3. Table 2 shows the occurrence of precipitates-microscopic observation results.
尚この際の第１層の塗布液（ａ）、第２層の塗布液
（ｂ）の塗布量は各々8cc/m2であつた。又本発明のウエ
ツト・オン・ウエツト塗布方式は本方式に限られるもの
でなく、例えば第２図に示すエクストルージヨン型同時
多層塗布方式を用いてもよい。第２図は可撓性支持体１
上に同時多層塗布注液器８を用い塗布液（ａ）２と塗布
液（ｂ）５とを同時に塗布する状態を説明するものであ
る。In this case, the coating amounts of the first layer coating liquid (a) and the second layer coating liquid (b) were 8 cc / m 2 . Further, the wet-on-wet coating method of the present invention is not limited to this method, and for example, an extrude-type simultaneous multilayer coating method shown in FIG. 2 may be used. FIG. 2 shows a flexible support 1
A state in which the coating liquid (a) 2 and the coating liquid (b) 5 are simultaneously applied using the simultaneous multilayer coating liquid injector 8 will be described.
尚、その他の析出物の性状は下記の通り ｉ）析出物は暗い視野の中で白つぽく透明なブツブツに
見える。 The properties of the other precipitates are as follows: i) The precipitates appear whitish and transparent in a dark visual field.
ii）ｉ）の場合は塗布表面上はとくに粗れてはいない。ii) In the case of i), the coating surface is not particularly rough.
iii）白つぽいブツブツの、その１個の囲りに細い溝状
の線がありその形が亀甲状である場合がある。iii) There is a case where a thin, groove-shaped line is surrounded by one of the whitish bumps and its shape is a turtle-like shape.
iv）iii）の場合塗布面は粗れて２〜３μの凹凸となる
場合がある。iv) In the case of iii), the coated surface may be rough and have irregularities of 2 to 3 μm.
上記に示した様に、比較例−１において第１層塗布液
（ａ−１）と第２層塗布液（ｂ−１）の組合せでは第１
層塗布液の溶媒であるトルエンが第２層塗布液中に拡散
したMEKとトルエンとの比率が変り第１層中のポリエス
テル（１）の一部がゲル状になり析出物の発生となる。
又第２層のニトロセルローズにとつては乾燥によりトル
エンに比し沸点の低いMEKが先に蒸発し第１層のトルエ
ンが過剰となる時点でゲル化を起し析出物の発生とな
る。As described above, in Comparative Example-1, the combination of the first layer coating solution (a-1) and the second layer coating solution (b-1)
The ratio of MEK and toluene in which toluene, which is the solvent of the layer coating solution, diffuses into the second layer coating solution changes, and a portion of the polyester (1) in the first layer becomes gel-like, and precipitates are generated.
For the nitrocellulose of the second layer, MEK having a lower boiling point than that of toluene evaporates first by drying and gelation occurs when the amount of toluene in the first layer becomes excessive, thereby generating a precipitate.
上記の２種類の溶質は溶媒と溶質の溶解性を説明する
表−３に示すように、ポリエステル（１）についてはケ
トン類、芳香族の各単独系には溶解せず、ニトロセルロ
ーズについてはケトン類には溶解するが芳香族には溶解
しないという特性がある。このことが析出物発生の主要
因で、換言すれば溶質の溶媒に対する相互溶解性がない
ということがバインダーの析出という現象を誘発するの
である。As shown in Table 3, which explains the solubility of the solvent and the solute, the above two solutes did not dissolve in ketones and aromatics alone for polyester (1), and did not dissolve in ketones and aromatics alone for nitrocellulose. Has the property of being soluble in but not aromatic. This is the main cause of the generation of precipitates. In other words, the lack of mutual solubility of the solute in the solvent induces the phenomenon of binder precipitation.
実施例−１について、第１層の下塗液（ａ−２）、第
２層のバツク層（ｂ−１）の場合、第１層のポリエステ
ル（２）の溶媒MEKは第２層のニトロセルローズも溶解
するので析出物は全く発生せず、満足する品質が得られ
た。 In Example 1, in the case of the undercoat liquid (a-2) of the first layer and the back layer (b-1) of the second layer, the solvent MEK of the polyester (2) of the first layer was nitrocellulose of the second layer. Was also dissolved, so that no precipitate was generated, and satisfactory quality was obtained.
比較例−２について、第１層下塗液（ａ−１）と第２
層磁性液（ｂ−１）の場合、第２層の塩酢ビは第１層の
溶媒の１つであるトルエンに全く溶解せず、第１層のポ
リエステル（１），（２）は又第２層の酢酸ブチルに夫
々溶解しない、ゲル化するの性質を持つているので製品
として不合格であつた。About Comparative Example-2, the first layer undercoat liquid (a-1)
In the case of the layer magnetic liquid (b-1), the polyvinyl chloride of the second layer is not dissolved at all in toluene, which is one of the solvents of the first layer, and the polyesters (1) and (2) of the first layer are The product was rejected because it had a property of gelling that did not dissolve in the butyl acetate of the second layer, respectively.
実施例−２は第１層下塗液（ａ−２）と第２層磁性層
（ｂ−２）の組合せで第１層の溶媒MEKは第２層の塩酢
ビに溶解性があるが、第１層の溶質であるポリエステル
（２）が第２層溶媒の酢酸ブチルにゲル化する性質があ
り、少々の析出物の発生があつたが製品として使用でき
る程度であつた。Example 2 is a combination of the first layer undercoating liquid (a-2) and the second layer magnetic layer (b-2), in which the solvent MEK of the first layer is soluble in polyvinyl chloride acetate of the second layer. Polyester (2), which is the solute of the first layer, had a property of gelling to butyl acetate as the solvent of the second layer, and although some precipitates were generated, it was of such an extent that it could be used as a product.
又実施例−３は第１層下塗液（ａ−３）、第２層バツ
ク液の組合わせは両液の溶媒エチレンクロライドで問題
なく製品とすることが出来た。In Example 3, the combination of the first layer undercoating liquid (a-3) and the second layer backing liquid was obtained by using both solvents, ethylene chloride, without any problem.
〔発明の効果〕 本発明はウエツト・オン・ウエツト塗布方式及び乾燥
する工程において、隣接する各層塗布液として、それぞ
れの塗布液の溶媒が相互の溶質に対し溶解性をもち、重
畳塗布を行い乾燥により重畳層の全溶質の体積に対し、
全溶媒の体積が３倍になる迄前記相互溶解性をもつ、各
液の塗布液特性を選定することにより面質の良好な磁気
記録材料の製造が可能になつたのみならず、ウエツト・
オン・ウエツト塗布方式により異つた役目の塗布層を重
畳させて塗布することが可能になり生産能率が向上し
た。又更に重畳塗布の内同時多層塗布による薄層・高速
塗布化により一層の品質向上と、原価低減へ貢献は大で
ある。[Effects of the Invention] In the present invention, in the wet-on-wet coating method and the drying step, the solvent of each coating liquid has solubility in mutual solutes as the coating liquid of each adjacent layer, and the coating is performed by superposition coating and drying. With respect to the volume of all solutes in the superposed layer,
By selecting the coating solution characteristics of each solution having the above-mentioned mutual solubility until the volume of the entire solvent is tripled, not only a magnetic recording material with good surface quality can be manufactured, but also wet and
By the on-wet coating method, coating layers having different roles can be applied in a superimposed manner, thereby improving production efficiency. Further, thin layer and high-speed coating by simultaneous multi-layer coating among superimposed coatings contributes to further improvement in quality and cost reduction.
第１図は本発明の塗布を実施するウエツト・オン・ウエ
ツト塗布方式の一実施例である遂次塗布方式の説明図、
第２図は同じく同時多層塗布方式の説明図である。 １……可撓性支持体、２……塗布液（ａ）、３……塗布
機（Ａ）、４……スムージングロール、５……塗布液
（ｂ）、６……塗布機（Ｂ）、７……バツクアツプロー
ル、８……同時多層塗布注液器。FIG. 1 is an explanatory view of a sequential coating method which is an embodiment of a wet-on-wet coating method for performing the coating of the present invention,
FIG. 2 is an explanatory view of the simultaneous multilayer coating method. DESCRIPTION OF SYMBOLS 1 ... Flexible support, 2 ... Coating liquid (a), 3 ... Coating machine (A), 4 ... Smoothing roll, 5 ... Coating liquid (b), 6 ... Coating machine (B) , 7 ... Back-up roll, 8 ... Simultaneous multi-layer coating liquid injector.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 近政 裕 小田原市扇町２丁目12番１号 富士写真 フイルム株式会社内 (56)参考文献 特開 昭60−52928（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Chikamasa 2-12-1, Ogimachi, Odawara-shi Fuji Photo Film Co., Ltd. (56) References JP-A-60-52928 (JP, A)
Claims (4)
形成される磁気記録媒体の製造方法において、隣接した
複数層の各塗布液組成の溶媒は隣接層の溶媒及び溶質に
対し相互溶解性を有し、かつ該複数層の塗布液の全溶質
の体積に対し全溶媒の体積が３倍の濃度になる迄該相互
溶解性が保たれ、該複数層の塗布液を湿潤状態で同時又
は可及的速やかに重畳して塗布し、乾燥することを特徴
とする磁気記録媒体の製造方法。1. A method of manufacturing a magnetic recording medium comprising a plurality of layers coated on a flexible support, wherein the solvent of each coating solution composition of the adjacent layers is different from the solvent and solute of the adjacent layers. Mutual solubility is maintained, and the mutual solubility is maintained until the volume of the total solvent becomes three times the volume of the total solute of the coating solution of the plurality of layers, and the coating solution of the plurality of layers is in a wet state. A method for producing a magnetic recording medium, wherein the method is carried out simultaneously or as quickly as possible by superimposing and drying.
と磁性層であることを特徴とする特許請求の範囲第１項
記載の磁気記録媒体の製造方法。2. A method for manufacturing a magnetic recording medium according to claim 1, wherein the plurality of adjacent layers are an undercoat layer and / or an intermediate layer and a magnetic layer.
ことを特徴とする特許請求の範囲第１項記載の磁気記録
媒体の製造方法。3. The method for manufacturing a magnetic recording medium according to claim 1, wherein the undercoat layer and the back layer are adjacent to each other.
ることを特徴とする特許請求の範囲第１項記載の磁気記
録媒体の製造方法。4. The method according to claim 1, wherein the plurality of adjacent layers are magnetic layers having different compositions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61054992A JP2568821B2 (en) | 1986-03-14 | 1986-03-14 | Manufacturing method of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61054992A JP2568821B2 (en) | 1986-03-14 | 1986-03-14 | Manufacturing method of magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62214524A JPS62214524A (en) | 1987-09-21 |
| JP2568821B2 true JP2568821B2 (en) | 1997-01-08 |
Family
ID=12986146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61054992A Expired - Fee Related JP2568821B2 (en) | 1986-03-14 | 1986-03-14 | Manufacturing method of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2568821B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101018615A (en) * | 2004-07-14 | 2007-08-15 | 新日本制铁株式会社 | Method of applying multilayer coating film and product with multilayer coating film |
| KR100924854B1 (en) * | 2001-08-28 | 2009-11-02 | 다이니폰 인사츠 가부시키가이샤 | Method for forming multilayered coating film |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2714850B2 (en) * | 1989-04-07 | 1998-02-16 | コニカ株式会社 | Coating device and multilayer coating method |
| JP4831448B2 (en) * | 2001-02-19 | 2011-12-07 | 大日本印刷株式会社 | Coating equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE795895A (en) * | 1972-02-24 | 1973-08-23 | Eastman Kodak Co | LAYER SPREADING PROCESS WITH THIXOTROPIC OR PSEUDOPLASTIC RHEOLOGICAL BEHAVIOR, ESPECIALLY OF MAGNETIC LAYERS |
| JPS6052928A (en) * | 1983-09-02 | 1985-03-26 | Hitachi Ltd | Multi-layer coating method of magnetic recording medium |
-
1986
- 1986-03-14 JP JP61054992A patent/JP2568821B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100924854B1 (en) * | 2001-08-28 | 2009-11-02 | 다이니폰 인사츠 가부시키가이샤 | Method for forming multilayered coating film |
| CN101018615A (en) * | 2004-07-14 | 2007-08-15 | 新日本制铁株式会社 | Method of applying multilayer coating film and product with multilayer coating film |
| JPWO2006006717A1 (en) * | 2004-07-14 | 2008-05-01 | 新日本製鐵株式会社 | Multi-layer coating method and product having multi-layer coating |
| US7754289B2 (en) | 2004-07-14 | 2010-07-13 | Nippon Steel Corporation | Method for coating a multilayer film and product having a multilayer coated film |
| JP4818923B2 (en) * | 2004-07-14 | 2011-11-16 | 新日本製鐵株式会社 | Multilayer coating method and product having multilayer coating |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62214524A (en) | 1987-09-21 |
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