JPS5921086B2 - magnetic recording medium - Google Patents
magnetic recording mediumInfo
- Publication number
- JPS5921086B2 JPS5921086B2 JP7839276A JP7839276A JPS5921086B2 JP S5921086 B2 JPS5921086 B2 JP S5921086B2 JP 7839276 A JP7839276 A JP 7839276A JP 7839276 A JP7839276 A JP 7839276A JP S5921086 B2 JPS5921086 B2 JP S5921086B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- parts
- magnetic recording
- recording medium
- weight
- 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
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】
この発明は磁気テープ、磁気切符などの磁気記録媒体に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic recording media such as magnetic tapes and magnetic tickets.
磁気記録媒体の磁性層は通常基体表面に磁性塗料を塗布
、乾燥してつくられており、上記塗料として近年水性エ
マルジョン系塗料が提案されている。The magnetic layer of a magnetic recording medium is usually made by applying a magnetic paint to the surface of a substrate and drying it. In recent years, water-based emulsion paints have been proposed as the paint.
この塗料は水性重合体エマルジョンに磁性粉末を分散さ
せたもので、従来汎用されている有機溶剤系塗料に不可
避とされる火災の危険性や保健衛生上の問題がない。こ
の発明は、このような利点を有する水性エマルジョン系
磁性塗料に関する一連の研究過程において、特定のアク
リル酸エステル共重合体を磁性粉末の結合剤として使用
すると、磁気記録媒体として実用上望まれる優れた機能
を有する磁性層を形成できることが判り、なされたもの
である。This paint is made by dispersing magnetic powder in an aqueous polymer emulsion, and is free from the fire hazards and health and hygiene problems that are inevitable with conventional organic solvent-based paints. In the course of a series of research on water-based emulsion-based magnetic paints that have these advantages, this invention revealed that when a specific acrylic acid ester copolymer is used as a binder for magnetic powder, it has excellent properties that are practically desired as magnetic recording media. This was done after discovering that it was possible to form a functional magnetic layer.
この発明における特定のアクリル酸エステル共重合体と
はアクリル酸ブチル、アクリル酸エチルなどのアクリル
酸エステル１００重量部に対して酢酸ビニルを通常２０
〜１３０重量部の割合で共重合好ましくは乳化重合して
得られるもので、この種共重合体は磁性粉末との親和性
が比較的良好で、しかも従来の有機溶剤系塗料に用いら
れている或いは前記水性エマルジョン系塗料に提案され
ている他のアクリル酸エステル共重合体などに較べて基
体とくに紙基体に対する強い接着性を有している。この
ようなアクリル酸エステル共重合体を水に乳化分散させ
た水性重合体エマルジョンにγ−Ｆｅ２Ｏ３粉末などの
磁性粉末を混合分散し、これをポリエステルフィルム、
紙基体などの基体表面に塗布し、乾燥すると、磁性粉末
がこの共重合体に均一に分散し、結着された磁性層を有
する磁気テープ、磁気切符などの各種磁気記録媒体が得
られる。The specific acrylic ester copolymer in this invention is usually 20 parts by weight of vinyl acetate per 100 parts by weight of an acrylic ester such as butyl acrylate or ethyl acrylate.
It is obtained by copolymerization, preferably emulsion polymerization, in a proportion of ~130 parts by weight.This type of copolymer has relatively good affinity with magnetic powder, and is used in conventional organic solvent-based paints. In addition, it has stronger adhesion to substrates, especially paper substrates, than other acrylic ester copolymers proposed for the water-based emulsion paints. Magnetic powder such as γ-Fe2O3 powder is mixed and dispersed in an aqueous polymer emulsion in which such an acrylic ester copolymer is emulsified and dispersed in water, and this is mixed and dispersed into a polyester film,
When applied to the surface of a substrate such as a paper substrate and dried, the magnetic powder is uniformly dispersed in this copolymer, and various magnetic recording media such as magnetic tapes and magnetic tickets having a bound magnetic layer are obtained.
この方法で形成される磁性層は、前記共重合体の良好な
親和性により層内での磁性粉末の分散性が良く、また共
重合体の前記接着性の向上により、従来の他のアクリル
酸エステル共重合体よりも接着性に優れている。The magnetic layer formed by this method has good dispersibility of the magnetic powder within the layer due to the good affinity of the copolymer, and the improved adhesion of the copolymer allows it to be used with other acrylic acids. It has better adhesive properties than ester copolymers.
接着性の向上は、たとえば磁気切符の場合指圧などによ
る磁性層の脱落を抑制するなど磁気記録媒体としての実
用価値を高くする。Improved adhesiveness increases the practical value of magnetic recording media, such as suppressing the magnetic layer from falling off due to finger pressure in the case of magnetic tickets, for example.
次に実施例によりこの発明を具体的に説明する。Next, the present invention will be specifically explained with reference to Examples.
以下において部とあるは重量部を表わすものとする。実
施例 １
アクリル酸エチル６５部と酢酸ビニル３５部と・ から
なる共重合体を乳化分散させた固形分濃度４５重量％の
水分散液５０部、水６０部とγ−Ｆｅ２Ｏ３磁性粉末６
５部とを加え、ボールミル中で混合分散して水性エマル
ジヨン系磁性塗料とする。In the following, parts refer to parts by weight. Example 1 50 parts of an aqueous dispersion with a solid content concentration of 45% by weight obtained by emulsifying and dispersing a copolymer consisting of 65 parts of ethyl acrylate and 35 parts of vinyl acetate, 60 parts of water, and 6 parts of γ-Fe2O3 magnetic powder.
5 parts and mixed and dispersed in a ball mill to obtain an aqueous emulsion magnetic paint.
この塗料を厚さ１７５μｍの紙基体に乾燥厚が約３０μ
ｍとなるように塗布、乾燥して磁気切符とした。This paint is applied to a paper substrate with a thickness of 175 μm to a dry thickness of approximately 30 μm.
It was applied and dried to obtain a magnetic ticket.
実施例 ２
実施例１において酢酸ビニルの使用量を５０部とした以
外は実施例１と全く同様にして磁気切符をつくつた。Example 2 A magnetic ticket was made in exactly the same manner as in Example 1 except that the amount of vinyl acetate used in Example 1 was changed to 50 parts.
比較例
実施例１において、酢酸ビニルを使用しなかつた以外は
実施例１と全く同様にして磁気切符をつくつた。Comparative Example A magnetic ticket was made in exactly the same manner as in Example 1, except that vinyl acetate was not used.
上記実施例１、実施例２、および比較例１に係る磁気切
符の角型比（Ｂｒ／Ｂｓ）と接着性を調べた結果は下表
に示される通りであつた。The results of examining the squareness ratio (Br/Bs) and adhesiveness of the magnetic tickets according to Example 1, Example 2, and Comparative Example 1 were as shown in the table below.
Claims (1)
部に対して酢酸ビニルを２０〜１３０重量部の割合で共
重合して得られるアクリル酸エステル共重合体を含んで
なる磁気記録媒体。1. A magnetic recording medium comprising, as a binder for the magnetic layer, an acrylic ester copolymer obtained by copolymerizing vinyl acetate in a ratio of 20 to 130 parts by weight to 100 parts by weight of acrylic ester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7839276A JPS5921086B2 (en) | 1976-06-30 | 1976-06-30 | magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7839276A JPS5921086B2 (en) | 1976-06-30 | 1976-06-30 | magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS533806A JPS533806A (en) | 1978-01-13 |
| JPS5921086B2 true JPS5921086B2 (en) | 1984-05-17 |
Family
ID=13660732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7839276A Expired JPS5921086B2 (en) | 1976-06-30 | 1976-06-30 | magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5921086B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62123266U (en) * | 1986-01-28 | 1987-08-05 | ||
| JPS62179056U (en) * | 1986-04-30 | 1987-11-13 |
-
1976
- 1976-06-30 JP JP7839276A patent/JPS5921086B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS533806A (en) | 1978-01-13 |
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