JP2989239B2 - Magnetic recording media - Google Patents
Magnetic recording mediaInfo
- Publication number
- JP2989239B2 JP2989239B2 JP2257019A JP25701990A JP2989239B2 JP 2989239 B2 JP2989239 B2 JP 2989239B2 JP 2257019 A JP2257019 A JP 2257019A JP 25701990 A JP25701990 A JP 25701990A JP 2989239 B2 JP2989239 B2 JP 2989239B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- magnetic
- recording medium
- acid
- fatty acid
- 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 - Fee Related
Links
Landscapes
- Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
Description
［産業上の利用分野］ 本発明は磁気記録媒体に関し、さらに詳しくは経時安
定性の良い可塑化効果及び潤滑効果を発現できる添加剤
を用いた磁気記録媒体に関する。 ［従来の技術］ 磁気記録媒体は磁性粉を分散した磁性塗膜をポリエス
テルフィルム等の非磁性支持体の表面に形成したものが
主流をなしている。磁気記録媒体の磁性塗膜としては、
磁性粉の分散性が良いこと（電磁特性に直接関係す
る）、潤滑性が良いこと（走行安定化）、耐摩耗性及び
耐久性が良いことなどの満足すべき要件があり、それら
の改善のために多くの努力がなされている。本発明は特
に分散性及び潤滑性の改善、特に経時安定性の向上を目
的とする。 分散性の向上及び潤滑性の向上のために従来一般にミ
リスチン酸（mp59℃）、パルミチン酸（mp63〜64℃）、
ステアリン酸（mp69〜70℃）等の比較的高沸点の脂肪族
化合物が広く使用され、可塑化効果（分散性向上）及び
潤滑性の向上に大きな役割を果している。 ［発明が解決しようとする課題］ しかしながら、これらの脂肪族化合物は低温〜常温で
の耐久走行において脂肪酸が磁性塗膜の表面に吐出し、
これがヘッドに付着して録音・再生に重大な悪影響を及
ぼす場合がある。 従って、本発明の目的はこの問題を解決し、長期に安
定した走行性を有する磁気記録媒体を提供することにあ
る。 ［課題を解決するための手段］ 本発明は、磁性粉を樹脂バインダ中に分散した磁性塗
膜を有する磁気記録媒体において、磁性塗膜中に、
（ａ）融点が35℃以下、炭素数が13以上の不飽和脂肪酸
と、（ｂ）20℃における粘度が１万cp以上のシリコンオ
イル又は融点が35℃以下の脂肪酸エステルと、を含有さ
せたことを特徴とする。 特に不飽和脂肪酸がエルカ酸であることが好ましく、
また脂肪酸エステルがステアリン酸ブチルであることが
好ましい。 本発明では分散性及び走行安定性の向上のために特に
不飽和脂肪族化合物としてエルカ酸（炭素数22の（Ｚ）
−13−ドコセン酸）を使用する。このものは融点が33.5
〜34℃であり可塑化及び潤滑効果が良く、しかも吐出が
無いすぐれた添加剤であることが分った。その他、本発
明で使用できる融点が35℃以下、炭素数13以上の不飽和
脂肪族化合物の中にオレイン酸、リノール酸、リノレン
酸があり、ここに炭素数13以上とした理由は可塑化効果
のためである。 不飽和脂肪族化合物の添加量はバインダ樹脂分に対し
て約1.0〜5.0重量％の割合で用いる。少な過ぎると効果
がなく、多過ぎると走行性が悪化する。 不飽和脂肪族化合物は過半量に達しない他の分散剤及
び潤滑剤と併用しても良い。特に20℃における粘度が１
万cp以上のシリコンオイルと併用すると高温走行耐久性
が上がる。シリコンオイルの添加量は不飽和脂肪族化合
物を基準として０〜100重量％で用いると良い。多過ぎ
ると走行性が悪化する。併用の利点は高温走行耐久性の
向上である。 不飽和脂肪族化合物と同時に35℃以下の融点を有する
脂肪酸エステルを併用しても良い。例えばステアリン酸
ブチル（mp＝27.5℃）と併用すると高速録音での潤滑効
果が上がる。高速録音用スレーブでは磁気テープが高速
度で走行するときに各種摺動部材（固定ガイド、回転ガ
イド、磁気ヘッド）に高速で接触する。その際塗膜に損
傷が生じたり、ヘッドに塗膜の一部が付着したりして正
常に録音再生ができない場合がある。そこでステアリン
酸ブチル等の脂肪酸エステルを用いることにより、上記
の不具合を無くすることができる。勿論このような用途
以外ではこの添加剤は不要である。脂肪酸エステルの添
加量は好ましくは不飽和脂肪族化合物に対して０〜100
重量％の割合で使用する。多過ぎると走行性が悪化す
る。 本発明で使用できる磁性粉としては針状γ−Fe2O3、C
o被着針状γ−Fe2O3などの酸化物等の磁性粉、Fe−Co、
Co−Ni、Fe−CO−Ni等の合金系の磁性粉などが使用でき
る。また、耐摩耗性を付与するアルミナ、クロミア等の
粉末、帯電防止剤などを含有することができる。また溶
剤としては周知のメチルエチルケトン、メチルブチルケ
トン等、その他任意のものが使用できる。 ［実施例の説明］ 以下に本発明の実施例を説明する。以下の実施例では
針状γ−Fe2O3とバインダを100:25（重量比）の割合で
溶剤225と混合した。ここにバインダとしては塩ビ−酢
ビ−共重合体が15重量％、ポリウレタンが10重量％のも
のを用い、不飽和脂肪族化合物としてエルカ酸をバイン
ダ樹脂分に対して0.5〜７重量％用いた。 ［比較例］ それらを混合し、厚さ12μｍのポリエステルフィルム
に乾厚５μｍに塗布し、カレンダ加工してテープとし
た。 またエルカ酸の１部をミリスチン酸と置換した。 結果を表１に示す。 表１からエルカ酸1.0〜5.0％が好適であることが分
る。しかし、以下の実施例から分かるように、この範囲
でも高温度の走行安定性が不十分である。 ［実施例１］ 実施例１において、さらにシリコンオイル（10万cp）
を用いた。また比較のためエルカ酸を用いないでシリコ
ンオイルのみを用いた。結果を表２に示す。なお表２の
初めの３欄には実施例１の試料を併記した。 表２からエルカ酸にシリコンオイルを併用すると脂肪
酸吐出の問題が解決されるだけでなく、高温耐久走行性
も改善されることが分る。 ［実施例２］ 高速録音での潤滑性、走行性を上げるためにエルカ酸
の他にステアリン酸ブチルを用いた。結果を表３に示
す。 表３からエルカ酸にステアリン酸ブチル（BS）を併用
すると高速走行性が良くなる。なおBS単独ではナキが発
生する。The present invention relates to a magnetic recording medium, and more particularly, to a magnetic recording medium using an additive capable of exhibiting a plasticizing effect and a lubricating effect with good aging stability. [Prior Art] The mainstream of magnetic recording media is a magnetic recording medium in which a magnetic coating film in which magnetic powder is dispersed is formed on the surface of a non-magnetic support such as a polyester film. As a magnetic coating film of a magnetic recording medium,
There are satisfactory requirements such as good dispersibility of magnetic powder (directly related to electromagnetic characteristics), good lubricity (running stability), good abrasion resistance and durability, etc. A lot of effort has been made for it. The present invention aims particularly at improving the dispersibility and lubricity, especially the stability over time. Conventionally, myristic acid (mp59 ° C), palmitic acid (mp63-64 ° C) for improving dispersibility and lubricity.
Aliphatic compounds having a relatively high boiling point, such as stearic acid (mp 69-70 ° C.), are widely used and play a large role in plasticizing effect (improving dispersibility) and improving lubricity. [Problems to be Solved by the Invention] However, in these aliphatic compounds, fatty acids are discharged to the surface of the magnetic coating film during endurance running at low temperature to normal temperature,
This may adhere to the head and seriously affect recording and reproduction. Therefore, an object of the present invention is to solve this problem and to provide a magnetic recording medium having stable running properties for a long period of time. [Means for Solving the Problems] The present invention relates to a magnetic recording medium having a magnetic coating film in which magnetic powder is dispersed in a resin binder;
(A) an unsaturated fatty acid having a melting point of 35 ° C. or less and a carbon number of 13 or more; and (b) a silicone oil having a viscosity of 10,000 cp or more at 20 ° C. or a fatty acid ester having a melting point of 35 ° C. or less. It is characterized by the following. Particularly preferably, the unsaturated fatty acid is erucic acid,
Preferably, the fatty acid ester is butyl stearate. In the present invention, in order to improve dispersibility and running stability, erucic acid (22 carbon atoms (Z)) is preferably used as an unsaturated aliphatic compound.
-13-docosenoic acid). It has a melting point of 33.5
It was found to be an excellent additive having good plasticizing and lubricating effects and no discharge. In addition, oleic acid, linoleic acid, and linolenic acid are among the unsaturated aliphatic compounds having a melting point of 35 ° C. or less and 13 or more carbon atoms that can be used in the present invention. For. The unsaturated aliphatic compound is used in an amount of about 1.0 to 5.0% by weight based on the binder resin. If the amount is too small, there is no effect, and if the amount is too large, the running performance deteriorates. The unsaturated aliphatic compound may be used in combination with other dispersants and lubricants that do not reach a majority. In particular, the viscosity at 20 ° C is 1
When used in combination with silicone oil of 10,000 cp or more, high-temperature running durability increases. The addition amount of the silicone oil is preferably 0 to 100% by weight based on the unsaturated aliphatic compound. If the amount is too large, the traveling performance deteriorates. The advantage of the combined use is an improvement in high-temperature running durability. A fatty acid ester having a melting point of 35 ° C. or less may be used together with the unsaturated aliphatic compound. For example, when used in combination with butyl stearate (mp = 27.5 ° C), the lubrication effect in high-speed recording increases. In the high-speed recording slave, when the magnetic tape runs at a high speed, it contacts various sliding members (fixed guide, rotating guide, magnetic head) at a high speed. At that time, the coating film may be damaged, or a part of the coating film may adhere to the head, so that recording and reproduction cannot be performed normally. Therefore, by using a fatty acid ester such as butyl stearate, the above-mentioned problems can be eliminated. Needless to say, this additive is unnecessary except for such uses. The amount of the fatty acid ester added is preferably 0 to 100 relative to the unsaturated aliphatic compound.
Used in percentages by weight. If the amount is too large, the traveling performance deteriorates. As the magnetic powder that can be used in the present invention, acicular γ-Fe 2 O 3 , C
o magnetic powder such as oxides such as the Chakuharijo γ-Fe 2 O 3, Fe -Co,
Alloy magnetic powders such as Co-Ni and Fe-CO-Ni can be used. Further, it may contain a powder such as alumina or chromia which imparts abrasion resistance, and an antistatic agent. As the solvent, other well-known solvents such as methyl ethyl ketone and methyl butyl ketone can be used. [Explanation of Example] An example of the present invention will be described below. In the following examples, acicular γ-Fe 2 O 3 and a binder were mixed with a solvent 225 at a ratio of 100: 25 (weight ratio). The binder used here was 15% by weight of a vinyl chloride-vinyl acetate copolymer and 10% by weight of a polyurethane, and erucic acid was used as an unsaturated aliphatic compound in an amount of 0.5 to 7% by weight based on the binder resin. . [Comparative Example] They were mixed, applied to a polyester film having a thickness of 12 µm to a dry thickness of 5 µm, and calendered to obtain a tape. Also, a part of erucic acid was replaced with myristic acid. Table 1 shows the results. Table 1 shows that 1.0 to 5.0% erucic acid is suitable. However, as can be seen from the following examples, the running stability at high temperatures is insufficient even in this range. [Example 1] In Example 1, silicon oil (100,000 cp) was further added.
Was used. For comparison, only silicone oil was used without using erucic acid. Table 2 shows the results. In the first three columns of Table 2, the sample of Example 1 was also described. From Table 2, it can be seen that when silicon oil is used in combination with erucic acid, not only the problem of fatty acid discharge is solved but also the high-temperature durability running property is improved. Example 2 In addition to erucic acid, butyl stearate was used in order to improve lubricity and running performance in high-speed recording. Table 3 shows the results. From Table 3, it can be seen that the use of erucic acid in combination with butyl stearate (BS) improves the high-speed running property. In addition, Naki is generated with BS alone.
特定の脂肪族化合物を使用したので耐久走行において
脂肪酸が磁性塗膜の表面に吐出することなく、これがヘ
ッドに付着して録音・再生に重大な悪影響を及ぼすこと
が防止でき、長期に安定した走行性を有する磁気記録媒
体を提供できることが分かる。The use of a specific aliphatic compound prevents fatty acids from being ejected to the surface of the magnetic coating film during endurance running, preventing them from adhering to the head and having a serious adverse effect on recording / playback, ensuring long-term stable running. It can be seen that a magnetic recording medium having the property can be provided.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−306519（ＪＰ，Ａ) 特開 昭63−152024（ＪＰ，Ａ) 特開 昭61−144726（ＪＰ，Ａ) 特開 昭61−294637（ＪＰ，Ａ) 特開 昭57−179946（ＪＰ，Ａ) 特開 昭56−19525（ＪＰ，Ａ) 伊藤邦雄編，「シリコーンハンドブッ ク」，第112〜115ページ，日刊工業新聞 社，1990年８月31日 (58)調査した分野(Int.Cl.6，ＤＢ名) G11B 5/71 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-306519 (JP, A) JP-A-63-152024 (JP, A) JP-A-61-144726 (JP, A) JP-A-61-144726 294637 (JP, A) JP-A-57-179946 (JP, A) JP-A-56-19525 (JP, A) Edited by Kunio Ito, "Silicone Handbook", pp. 112-115, Nikkan Kogyo Shimbun, 1990 August 31, 2008 (58) Field surveyed (Int.Cl. 6 , DB name) G11B 5/71
Claims (2)
膜を有する磁気記録媒体において、磁性塗膜中に、
（ａ）融点が35℃以下、炭素数が13以上の不飽和脂肪酸
と、（ｂ）20℃における粘度が１万cp以上のシリコンオ
イル又は融点が35℃以下のステアリン酸ブチルと、を含
有させたことを特徴とする磁気記録媒体。In a magnetic recording medium having a magnetic coating film in which magnetic powder is dispersed in a resin binder,
(A) An unsaturated fatty acid having a melting point of 35 ° C. or less and having 13 or more carbon atoms, and (b) a silicone oil having a viscosity of 10,000 cp or more at 20 ° C. or butyl stearate having a melting point of 35 ° C. or less. A magnetic recording medium, characterized in that:
とする請求項１記載の磁気記録媒体。2. The magnetic recording medium according to claim 1, wherein the unsaturated fatty acid is erucic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257019A JP2989239B2 (en) | 1990-09-28 | 1990-09-28 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257019A JP2989239B2 (en) | 1990-09-28 | 1990-09-28 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04137221A JPH04137221A (en) | 1992-05-12 |
| JP2989239B2 true JP2989239B2 (en) | 1999-12-13 |
Family
ID=17300608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2257019A Expired - Fee Related JP2989239B2 (en) | 1990-09-28 | 1990-09-28 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2989239B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61144726A (en) * | 1984-12-18 | 1986-07-02 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| JPH0673174B2 (en) * | 1985-06-20 | 1994-09-14 | 日立マクセル株式会社 | Magnetic recording medium |
| JPS63152024A (en) * | 1986-12-16 | 1988-06-24 | Sony Corp | Magnetic recording medium |
-
1990
- 1990-09-28 JP JP2257019A patent/JP2989239B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 伊藤邦雄編，「シリコーンハンドブック」，第１１２〜１１５ページ，日刊工業新聞社，１９９０年８月３１日 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04137221A (en) | 1992-05-12 |
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