JPS5939811B2 - Method for manufacturing magnetic recording media - Google Patents
Method for manufacturing magnetic recording mediaInfo
- Publication number
- JPS5939811B2 JPS5939811B2 JP55035097A JP3509780A JPS5939811B2 JP S5939811 B2 JPS5939811 B2 JP S5939811B2 JP 55035097 A JP55035097 A JP 55035097A JP 3509780 A JP3509780 A JP 3509780A JP S5939811 B2 JPS5939811 B2 JP S5939811B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- magnetic
- protective coating
- layer
- paint
- 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
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
- G11B5/72—Protective coatings, e.g. anti-static or antifriction
Description
【発明の詳細な説明】
この発明は、磁性層の表面に保護被膜を有する磁気記録
媒体の製造方法に関するものであり、その目的とすると
ころは保護被膜の層間接着性が良好で耐久性に優れた磁
気記録媒体を提供する点にある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a magnetic recording medium having a protective coating on the surface of a magnetic layer, and its purpose is to provide a protective coating with good interlayer adhesion and excellent durability. The object of the present invention is to provide a magnetic recording medium with a magnetic recording medium.
一般的に、磁気記録媒体においては、磁性層を保護して
耐久性を改善することならびに外観を良くすることを目
的として磁性層の表面に保護被膜を設けたものが多い。Generally, in many magnetic recording media, a protective coating is provided on the surface of the magnetic layer for the purpose of protecting the magnetic layer and improving its durability as well as improving its appearance.
ところが、この種の磁気記録媒体、特に磁気カードなど
においてはそれ自体の剛性が強く、かつ記録再生時に強
い圧力で磁気ヘッドやガイド部材と摺接するため、保護
被膜と磁性層との間で界面剥離を生じ易いという問題が
あり、またこの層間接着性の面から保護被膜として用い
得る樹脂材料が極めて限られたものとなつていた。この
発明者らは、上述の状況に鑑みて鋭意研究を重ねた結果
、基体上に形成された磁性層の表血に保護被膜を設ける
に当たり、保護被膜塗料をグラビア塗布にて断面歯形状
に塗着させ、しかるのちにこれを均らして平担状とすれ
ば、前記の層間接着性が大きく改善されて優れた耐久性
を有する磁気記録媒体が得られること、ならびにこのよ
うな接着性の改善によつて保護被膜材料の適用範囲を拡
大できることを見い出した。However, this type of magnetic recording medium, especially magnetic cards, etc., has high rigidity and comes into sliding contact with the magnetic head and guide member under strong pressure during recording and reproduction, resulting in interfacial peeling between the protective coating and the magnetic layer. Furthermore, due to the interlayer adhesion properties, the resin materials that can be used as the protective coating are extremely limited. As a result of extensive research in view of the above-mentioned situation, the inventors discovered that, in order to provide a protective coating on the surface blood of a magnetic layer formed on a substrate, the protective coating paint was coated in a tooth-shaped cross section using gravure coating. The above-mentioned interlayer adhesion is greatly improved and a magnetic recording medium having excellent durability can be obtained by making the above-mentioned interlayer adhesion significantly improved by flattening it and then leveling it into a flat shape. It has been found that the range of application of protective coating materials can be expanded by
以下、この発明の力法を図面によつて説明する。Hereinafter, the force method of this invention will be explained with reference to the drawings.
第１図で示すように、基体１上に形成された磁性層２の
表面に保護被膜塗料３ａをグラビア塗布装置５にて塗着
し、断面歯形状の塗料層３ｂとする。このような塗着状
態下では、断面歯形状の塗料層３ｂ中の溶剤が磁性層２
に浸透して、各々の塗料層３ｂの下部に侵食親和層４が
形成される。続いて、第３図のように、塗料層３ｂが粘
性を維持している間にフィルムブレードなどの適当な装
置６を用いて押し均らし、平担な表面の保護被膜３ｃと
する。上記の方法にて得られた磁気記録体は、第４図で
示すように、保護被膜３ｃと磁性層２との接着面積が拡
大すると共に、侵食親和層４が゜くさび状に磁性層へ侵
入しているため、ずり応力による層間剥離の防止効果が
非常に大きい。As shown in FIG. 1, a protective coating paint 3a is applied to the surface of a magnetic layer 2 formed on a substrate 1 using a gravure coating device 5 to form a paint layer 3b having a tooth-shaped cross section. Under such a coating state, the solvent in the paint layer 3b having a tooth-shaped cross section will spread to the magnetic layer 2.
The corrosion-friendly layer 4 is formed under each paint layer 3b. Subsequently, as shown in FIG. 3, while the paint layer 3b maintains its viscosity, it is leveled using a suitable device 6 such as a film blade to form a protective coating 3c with a flat surface. In the magnetic recording body obtained by the above method, as shown in FIG. 4, the adhesion area between the protective coating 3c and the magnetic layer 2 is expanded, and the erosion affinity layer 4 penetrates into the magnetic layer in a wedge shape. Therefore, the effect of preventing delamination due to shear stress is extremely large.
次に実施例によつてこの発明を説明する。Next, the present invention will be explained with reference to Examples.
実施例
約２００μ厚の塩化ビニル基体シート上に、γ−Ｆｅ２
Ｏ３磁性粉末７５重量部、ＶＡＧＨ（Ｕ。Example γ-Fe2 was deposited on a vinyl chloride base sheet approximately 200μ thick.
75 parts by weight of O3 magnetic powder, VAGH (U.
ｃ、Ｃ社製塩ビー酢ビービニルアルコール共重合体）２
０重量部、ＤＯＰ５重量部、メチルイソブチルケトン−
トルエン混合溶剤１１０重量部からなる組成物を混練し
た磁性塗料を塗布乾燥して約１２μ厚の磁性層を形成し
、この磁性層上にスターラック＃１０１（旭タウ社製ア
クリロニトリル−ブタジエン−スチレン共重合体）９５
重量部、ＳＲＸ−２９０（トーレシリコン社製シリコー
ン樹脂）５．０重量部、ＳＲＸ−２４２ＡＣ（トーレシ
リコーン社製シリコーン樹脂用硬化剤）０．２重量部、
ＳＲＸ−２４２ＡＤ（同上）０．１重量部、メチルイソ
ブチルケトン４５０重量部、トルエン４５０重量部から
なる保護被膜塗料を歯形グラビア塗布機を用いて断面歯
形状に塗着し、１秒間放置後、フイルムブレード装置を
用いて平担化し、乾燥して約３μの保護被膜を形成し、
所定の大きさに裁断して磁気カードを製作した。比較例
保護被膜塗料の塗布を従来法通り行なつた以外は、実施
例１と同様にして磁気カードを製作した。c, chlorine vinyl vinegar vinyl alcohol copolymer manufactured by Company C) 2
0 parts by weight, 5 parts by weight of DOP, methyl isobutyl ketone
A magnetic coating prepared by kneading a composition consisting of 110 parts by weight of a toluene mixed solvent is coated and dried to form a magnetic layer approximately 12 μm thick. polymer) 95
Parts by weight, SRX-290 (silicone resin manufactured by Toray Silicone Co., Ltd.) 5.0 parts by weight, SRX-242AC (curing agent for silicone resin manufactured by Toray Silicone Co., Ltd.) 0.2 parts by weight,
A protective coating paint consisting of 0.1 parts by weight of SRX-242AD (same as above), 450 parts by weight of methyl isobutyl ketone, and 450 parts by weight of toluene was applied to the cross-sectional tooth shape using a tooth-shaped gravure coater, and after being left for 1 second, the film was coated. Flatten it using a blade device and dry it to form a protective film of about 3 μm,
A magnetic card was produced by cutting it to a predetermined size. Comparative Example A magnetic card was produced in the same manner as in Example 1, except that the protective coating paint was applied in the conventional manner.
以上の実施例および比較例にて得られた磁気カードにつ
いて、保護被膜層に基盤目状の切口をきざみ、上から粘
着テープを貼りつけて剥離し、その剥離状態を試験する
基盤目ピーリング試験法によつて保護被膜の剥離試験を
行なつたところ、実施例のものではほとんど剥離がなく
、比較例のものでは約３０（Ｆｆ）の値であり、この発
明の力法による磁気記録媒体が保護被膜の層間接着性に
優れて良好な耐久性を有することが明らかである。For the magnetic cards obtained in the above Examples and Comparative Examples, base grain peeling test method involves making cuts in the shape of base grains in the protective coating layer, pasting adhesive tape on top of the magnetic cards, peeling them off, and testing the peeling state. When a peeling test was conducted on the protective film using the method of the present invention, there was almost no peeling in the example, and the value of the comparative example was about 30 (Ff), indicating that the magnetic recording medium using the force method of the present invention protects the protective film. It is clear that the coating has excellent interlayer adhesion and good durability.
第１図はこの発明における保護被膜塗料の塗着力法を示
す概略部分断面図、第２図は保護被膜塗料が断面歯形状
に塗着されたときの磁気記録媒体を示す部分断面図、第
３図は断面歯形状に塗着された保護被膜塗料層を平担化
する状態を示す部分断面図、第４図はこの発明の力法に
よつて得られた磁気記録媒体を示す部分断面図である。
１・・・・・・基体、２・・・・・・磁性層、３ａ・・
・・・・保護被膜塗料、３ｂ・・・・・・断面歯形状の
保護被膜塗料層、３ｃ・・・・・・保護被膜。FIG. 1 is a schematic partial cross-sectional view showing the adhesive force method of the protective coating paint in this invention, FIG. 2 is a partial cross-sectional view showing a magnetic recording medium when the protective coating paint is applied in a tooth-shaped cross section, and FIG. The figure is a partial cross-sectional view showing the state in which the protective coating paint layer applied to the cross-sectional tooth shape is flattened, and FIG. 4 is a partial cross-sectional view showing a magnetic recording medium obtained by the force method of the present invention. be. 1... Base body, 2... Magnetic layer, 3a...
...Protective film paint, 3b...Protective film paint layer with a tooth-shaped cross section, 3c...Protective film.
Claims (1)
るに当たり、保護被膜塗料をグラビア塗布にて断面歯形
状に塗着させ、しかるのちにこれを均らして平担状とす
ることを特徴とする磁気記録媒体の製造方法。1. When providing a protective film on the surface of a magnetic layer formed on a substrate, the protective film paint is applied in a tooth-shaped cross section by gravure coating, and then it is leveled to form a flat shape. A method for manufacturing a magnetic recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55035097A JPS5939811B2 (en) | 1980-03-18 | 1980-03-18 | Method for manufacturing magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55035097A JPS5939811B2 (en) | 1980-03-18 | 1980-03-18 | Method for manufacturing magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56143537A JPS56143537A (en) | 1981-11-09 |
| JPS5939811B2 true JPS5939811B2 (en) | 1984-09-26 |
Family
ID=12432432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55035097A Expired JPS5939811B2 (en) | 1980-03-18 | 1980-03-18 | Method for manufacturing magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5939811B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS605423A (en) * | 1983-06-22 | 1985-01-12 | Fujitsu Ltd | Magnetic recording medium and its production |
-
1980
- 1980-03-18 JP JP55035097A patent/JPS5939811B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56143537A (en) | 1981-11-09 |
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