JP2545054B2 - Method of manufacturing magnetic recording medium - Google Patents
Method of manufacturing magnetic recording mediumInfo
- Publication number
- JP2545054B2 JP2545054B2 JP58046372A JP4637283A JP2545054B2 JP 2545054 B2 JP2545054 B2 JP 2545054B2 JP 58046372 A JP58046372 A JP 58046372A JP 4637283 A JP4637283 A JP 4637283A JP 2545054 B2 JP2545054 B2 JP 2545054B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic powder
- powder
- recording medium
- magnetic recording
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/712—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the surface treatment or coating of magnetic particles
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】 この発明は記録素子として金属粉や磁性酸化物粉など
の磁性粉を用いた磁気テープその他の磁気記録媒体に関
する。The present invention relates to a magnetic tape or other magnetic recording medium using magnetic powder such as metal powder or magnetic oxide powder as a recording element.
この種の磁気記録媒体は、一般に金属粉や磁性酸化物
粉の如き磁性粉とバインダとを有機溶剤中に混合分散さ
せた磁性塗料をつくり、これをベース上に塗着してつく
られているが、この方法でつくられる従来の磁気記録媒
体は磁性層の耐磨耗性に劣るためか耐久性に欠ける問題
があつた。This kind of magnetic recording medium is generally made by preparing a magnetic coating material in which magnetic powder such as metal powder or magnetic oxide powder and a binder are mixed and dispersed in an organic solvent, and coating this on a base. However, the conventional magnetic recording medium produced by this method has a problem that the magnetic layer is inferior in durability, probably because it is inferior in abrasion resistance.
この発明は、上記問題を回避するために鋭意検討した
結果見い出されたものであり、その要旨とするところ
は、無機シラン化合物を溶解させたアルカリ水溶液中に
磁性粉を分散混合しこれに炭酸ガスを加えて中和したの
ち、上記磁性粉を取り出して加熱乾燥することにより、
上記磁性粉の粒子表面に酸化けい素被膜を形成し、この
被膜を有する磁性粉とバインダとを含む有機溶剤磁性塗
料をベース上に塗着することを特徴とする磁気記録媒体
の製造法にある。This invention has been found as a result of extensive studies to avoid the above problems, and its gist is to disperse and mix magnetic powder in an alkaline aqueous solution in which an inorganic silane compound is dissolved and to add carbon dioxide gas to it. After neutralizing by adding, by taking out the magnetic powder and heating and drying,
A method for producing a magnetic recording medium, characterized in that a silicon oxide film is formed on the particle surface of the magnetic powder, and an organic solvent magnetic paint containing the magnetic powder having the film and a binder is applied onto a base. .
すなわち、この発明では、金属粉や磁性酸化物粉の如
き磁性粉をバインダと混合して有機溶剤系磁性塗料を調
製するに当たつて、予め上記磁性粉を無機シラン化合物
で表面処理して、粒子表面に酸化けい素被膜を形成した
ときにはこの種塗料をベース上に塗着して形成される磁
性層の耐磨耗性が著しく改善されて耐久性良好な磁気記
録媒体が得られることを見い出すに至つたものである。That is, in the present invention, in preparing an organic solvent-based magnetic paint by mixing a magnetic powder such as a metal powder or a magnetic oxide powder with a binder, the magnetic powder is surface-treated in advance with an inorganic silane compound, We have found that when a silicon oxide film is formed on the surface of particles, the wear resistance of the magnetic layer formed by coating this type of paint on the base is significantly improved and a magnetic recording medium with good durability can be obtained. It is the one that led to.
磁性粉を表面処理する方法としては、無機シラン化合
物をアルカリ性水溶液に溶解させこれに磁性粉を投入し
て分散混合しながら炭酸ガスを加えて中和したのち取出
して加熱乾燥すればよい。これによつて磁性粉表面に比
較的強固に結合した酸化けい素被膜が形成される。As a method for surface-treating the magnetic powder, an inorganic silane compound may be dissolved in an alkaline aqueous solution, and the magnetic powder may be added to and dispersedly mixed with carbon dioxide gas for neutralization, and then taken out and dried by heating. As a result, a silicon oxide film which is relatively tightly bonded is formed on the surface of the magnetic powder.
上記無機シラン化合物の例としては、オルトけい酸ナ
トリウム、メタけい酸ナトリウム、メタけい酸カリウ
ム、種々の組成の水ガラスの如き水溶性けい酸塩などが
挙げられる。この化合物の付着量としては、磁性粉との
合計量中に占める割合が0.01重量％以上となるような割
合とされるが、あまり多くつけすぎると磁性特性上好結
果が得られないから好ましくは0.5重量％以下である。Examples of the above-mentioned inorganic silane compounds include sodium orthosilicate, sodium metasilicate, potassium metasilicate, and water-soluble silicates such as water glass having various compositions. The amount of this compound attached is such that the ratio in the total amount with the magnetic powder is 0.01% by weight or more, but if too much is added, good results cannot be obtained in terms of magnetic properties, and therefore it is preferable. It is 0.5% by weight or less.
磁性粉としては、Fe粉、Co粉や合金粉の如き金属磁性
粉のほか、γ−Fe2O3粉やFe3O4粉またはこれらの中間酸
化状態の酸化鉄磁性粉、コバルト含有の酸化鉄磁性粉な
どの酸化物磁性粉が広く包含される。中でもコバルト含
有の酸化鉄磁性粉、特に粒子表面にコバルトを被着させ
たタイプの上記磁性粉を用いると、この発明の効果がよ
り顕著となる。Magnetic powders include metallic powders such as Fe powders, Co powders, and alloy powders, γ-Fe 2 O 3 powders, Fe 3 O 4 powders, iron oxide magnetic powders in their intermediate oxidation state, and cobalt-containing oxides. Oxide magnetic powder such as iron magnetic powder is widely included. Above all, when the cobalt-containing iron oxide magnetic powder, particularly the above magnetic powder of the type in which cobalt is adhered to the particle surface is used, the effect of the present invention becomes more remarkable.
上記無機シラン化合物で処理された磁性粉を分散結着
させるバインダとしては従来用いられているものを広範
囲に使用でき、たとえばポリエステル樹脂、ポリウレタ
ン樹脂、繊維素系樹脂、ポリビニルブチラール樹脂、塩
化ビニル−酢酸ビニル系共重合樹脂、塩化ビニリデン系
樹脂などの各種樹脂あるいはこれらと低分子量イソシア
ネート化合物を架橋剤として併用したものなどが挙げら
れる。As the binder for dispersing and binding the magnetic powder treated with the above-mentioned inorganic silane compound, those conventionally used can be widely used, for example, polyester resin, polyurethane resin, fibrin resin, polyvinyl butyral resin, vinyl chloride-acetic acid. Examples thereof include various resins such as vinyl-based copolymer resins and vinylidene chloride-based resins, and those in which these are used in combination with a low molecular weight isocyanate compound as a crosslinking agent.
この発明では上記磁性粉およびバインダを有機溶剤中
に溶解分散させて磁性塗料を調製するが、ここで用いら
れる有機溶剤としては特に限定されず、シクロヘキサノ
ン、トルエン、メチルエチルケトンなどの各種溶剤がい
ずれも使用可能である。In the present invention, the magnetic powder and the binder are dissolved and dispersed in an organic solvent to prepare a magnetic paint, but the organic solvent used here is not particularly limited, and various solvents such as cyclohexanone, toluene, and methyl ethyl ketone are used. It is possible.
上記方法にてつくられる磁性塗料を常法によりポリエ
ステルフイルムの如きベース上に塗布し乾燥することに
より、この発明の耐久性良好な磁気テープその他の磁気
記録媒体が得られる。A magnetic tape or other magnetic recording medium having good durability according to the present invention can be obtained by applying the magnetic coating material produced by the above method onto a base such as polyester film by a conventional method and drying it.
以下に、この発明の実施例を記載する。以下において
部とあるは重量部を意味するものとする。Examples of the present invention will be described below. In the following, "parts" means "parts by weight".
実施例 無機シラン化合物としてオルトけい酸ナトリウムを用
いてこれをアルカリ性水溶液に溶解させてなるpH13の溶
液をつくり、この溶液中にCo含有のγ−Fe2O3粉を投入
してよく撹拌混合した。撹拌混合を続けながら炭酸ガス
を吹き込んで液のpHが８となるまで中和した。その後上
記磁性粉を取り出して加熱乾燥することにより、粒子表
面に酸化けい素被膜を有するCo含有のγ−Fe2O3粉が得
られた。この磁性粉の酸化けい素付着量は、0.01重量％
であつた。Example Using sodium orthosilicate as an inorganic silane compound, a solution having a pH of 13 was prepared by dissolving it in an alkaline aqueous solution, and Co-containing γ-Fe 2 O 3 powder was added to this solution and well mixed with stirring. . Carbon dioxide gas was blown in while continuing stirring and mixing until the pH of the liquid became 8. Then, the magnetic powder was taken out and dried by heating to obtain Co-containing γ-Fe 2 O 3 powder having a silicon oxide film on the particle surface. The amount of silicon oxide attached to this magnetic powder is 0.01% by weight.
It was.
上記表面処理磁性粉を用いて以下の配合組成により磁
性塗料を調製した。Using the surface-treated magnetic powder, a magnetic coating material was prepared with the following composition.
表面処理磁性粉 100 部 硝化綿 15 部 ポリウレタン樹脂 15 部 デイスモジュームＬ ５ 部 （バイエル（西独）社製の三官能性イソシアネート化合
物） メチルエチルケトン 80 部 トルエン 80 部 ステアリン酸 0.1部 上記磁性塗料を15μｍ厚のポリエステルベースフィル
ム上に乾燥後の厚みが５μｍとなるように塗布し乾燥し
たのち、カレンダー処理後テープ幅1.27mmに裁断し、こ
の発明の磁気テープとした。Surface-treated magnetic powder 100 parts Nitrified cotton 15 parts Polyurethane resin 15 parts Dice Modme L 5 parts (Trifunctional isocyanate compound manufactured by Bayer (West Germany)) Methyl ethyl ketone 80 parts Toluene 80 parts Stearic acid 0.1 parts The above magnetic paint is 15 μm thick After being coated on the polyester base film of No. 3 to a thickness of 5 μm and dried, the tape was calendered and cut to a tape width of 1.27 mm to obtain the magnetic tape of the present invention.
このテープにつき耐久特性を調べるためにスチール試
験（常温スチース再生時間）を行つた結果は、下記のと
おりであつた。なお、下記の比較例とは、未処理のCo含
有のγ−Fe2O3粉を用いた場合の結果である。The results of a steel test (normal temperature steece regeneration time) conducted to examine the durability characteristics of this tape are as follows. In addition, the following comparative examples are results when untreated Co-containing γ-Fe 2 O 3 powder was used.
スチール試験（分） 実施例 60以上 比較例 20 上記結果から明らかなように、この発明の磁気テープ
は耐久性に非常にすぐれたものであることが判る。Steel test (min) Example 60 and above Comparative example 20 As is apparent from the above results, it is understood that the magnetic tape of the present invention has very excellent durability.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮田 一司 茨木市丑寅一丁目１番88号 日立マクセ ル株式会社内 (56)参考文献 特開 昭56−130838（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushi Miyata 1-88 Ichira, Ibaraki-shi Hitachi Maxell, Ltd. (56) References JP-A-56-130838 (JP, A)
Claims (1)
溶液中に磁性粉を分散混合しこれに炭酸ガスを加えて中
和したのち、上記磁性粉を取り出して加熱乾燥すること
により、上記磁性粉の粒子表面に酸化けい素被膜を形成
し、この被膜を有する磁性粉とバインダとを含む有機溶
剤系磁性塗料をベース上に塗着することを特徴とする磁
気記録媒体の製造法。1. A magnetic powder is dispersed and mixed in an alkaline aqueous solution in which an inorganic silane compound is dissolved, carbon dioxide is added to the magnetic powder to neutralize the magnetic powder, and the magnetic powder is taken out and dried by heating. A method for producing a magnetic recording medium, which comprises forming a silicon oxide film on the surface of a particle and applying an organic solvent-based magnetic paint containing magnetic powder having the film and a binder onto a base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046372A JP2545054B2 (en) | 1983-03-20 | 1983-03-20 | Method of manufacturing magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58046372A JP2545054B2 (en) | 1983-03-20 | 1983-03-20 | Method of manufacturing magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59172147A JPS59172147A (en) | 1984-09-28 |
| JP2545054B2 true JP2545054B2 (en) | 1996-10-16 |
Family
ID=12745314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58046372A Expired - Lifetime JP2545054B2 (en) | 1983-03-20 | 1983-03-20 | Method of manufacturing magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2545054B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280918A (en) * | 1980-03-10 | 1981-07-28 | International Business Machines Corporation | Magnetic particle dispersions |
-
1983
- 1983-03-20 JP JP58046372A patent/JP2545054B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59172147A (en) | 1984-09-28 |
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