JPH08180365A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH08180365A JPH08180365A JP6323189A JP32318994A JPH08180365A JP H08180365 A JPH08180365 A JP H08180365A JP 6323189 A JP6323189 A JP 6323189A JP 32318994 A JP32318994 A JP 32318994A JP H08180365 A JPH08180365 A JP H08180365A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- binder
- lubricant
- amount
- 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.)
- Granted
Links
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、非磁性支持体上に強磁
性粉末と結合剤から構成されてなる磁性層を有する塗布
型の磁気記録媒体に関し、特に走行性及び耐久性の向上
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating type magnetic recording medium having a magnetic layer composed of a ferromagnetic powder and a binder on a non-magnetic support, and more particularly to improving runnability and durability.
【０００２】[0002]
【従来の技術】ＶＴＲ（ビデオテープレコーダ）等の磁
気記録媒体において、高記録密度化、高画質化を図る目
的で電磁変換特性の向上に関する検討が盛んに行われて
いる。この電磁変換特性の向上に伴い、近年蒸着テープ
等の薄膜媒体が提案され既にＨｉ−８ビデオ等の一部の
フォーマットにおいて実用化されてはいるが、価格など
の点で従来の塗布型の磁気記録媒体は依然主流を占めて
いる。2. Description of the Related Art In magnetic recording media such as VTRs (video tape recorders), studies have been actively conducted on improvement of electromagnetic conversion characteristics for the purpose of achieving high recording density and high image quality. With the improvement of the electromagnetic conversion characteristics, a thin film medium such as a vapor deposition tape has been proposed in recent years and has already been put into practical use in some formats such as Hi-8 video. Recording media are still mainstream.
【０００３】また、この磁気記録媒体においては、走行
性及び耐久性が重要な特性であり、電磁変換特性の向上
を図りながら十分な走行性及び耐久性を確保することが
媒体の設計において重要な課題である。In this magnetic recording medium, running properties and durability are important properties, and it is important in designing the medium to secure sufficient running properties and durability while improving electromagnetic conversion characteristics. It is an issue.
【０００４】これまで、電磁変換特性の向上を実現する
ためには、磁気特性の向上、テープ表面の鏡面化による
スペーシングロスの低減等が検討されている。例えば、
塗布型の磁気記録媒体において、テープ表面の鏡面化を
図る方法としては、支持体の表面性を向上させたり、強
磁性粉末や研磨剤等の粒径を小さくしたり、これらをよ
り均一に分散させる等の工夫がなされている。また、テ
ープ表面の鏡面化や強磁性粉末の高充填を目的として、
磁性塗料を塗布し乾燥させた後にカレンダー処理が行わ
れている。In order to improve the electromagnetic conversion characteristics, improvement of magnetic characteristics and reduction of spacing loss due to the mirror surface of the tape have been studied. For example,
In the coating type magnetic recording medium, as a method of making the surface of the tape a mirror surface, the surface property of the support is improved, the particle size of the ferromagnetic powder or the abrasive is reduced, and these are more uniformly dispersed. It has been devised so that it can be done. In addition, for the purpose of making the surface of the tape a mirror surface and filling the ferromagnetic powder highly,
After applying the magnetic paint and drying it, calendering is performed.
【０００５】しかし、このようにして電磁変換特性の向
上を達成しようとした場合、走行性及び耐久性は低下し
てしまい、これを考慮すると実際には大幅な電磁変換特
性の向上を達成することができないのが実状である。However, if an attempt is made to improve the electromagnetic conversion characteristics in this way, the running performance and durability will deteriorate, and in consideration of this, in reality, a significant improvement in the electromagnetic conversion characteristics should be achieved. The reality is that you cannot do it.
【０００６】一方、走行性及び耐久性については、潤滑
剤や表面形状の工夫による摩擦の低減や、支持体や結合
剤の最適化及び架橋による機械強度の向上、潤滑剤の最
適化による油膜強度の向上、研磨剤の使用による研磨性
の付与等がなされている。On the other hand, with regard to the running property and durability, the friction is reduced by devising the lubricant and the surface shape, the mechanical strength is improved by optimizing the support and the binder and the crosslinking, and the oil film strength is optimized by optimizing the lubricant. And the addition of abrasiveness by using an abrasive.
【０００７】しかし、走行性及び耐久性といっても多種
多様であり、また多くの原材料からなるために挙動が複
雑であり、ある条件での走行耐久性を満足させるべく対
処しても、他の条件での特性が悪化してしまうことが多
く、複数の条件を同時に高い水準で満足させることは困
難である。[0007] However, there are various types of running properties and durability, and the behavior is complicated because it consists of many raw materials. Even if measures are taken to satisfy running durability under certain conditions, In many cases, the characteristics are deteriorated under the above condition, and it is difficult to satisfy a plurality of conditions at a high level at the same time.
【０００８】例えば、高速で摺動する部分の摩擦の低減
や耐久性の付与を図るために、従来より高級脂肪酸のエ
ステル化合物が用いられている。しかし、これをもちい
ることにより低速で摺動する部分の摩擦が上昇してしま
い走行性が悪化する。また、添加量が多いと、結合剤を
可塑化してしまい耐久性が悪化すると言った問題が生ず
る。更に、添加量が多い場合には、テープ表面の鏡面化
や強磁性粉末の高充填を目的として行われるカレンダー
処理により潤滑剤が摺動面に有効に供給されるために必
要な空孔が縮小又は閉塞されてしまい有効に作用する潤
滑剤量がかえって減少して耐久性が悪化するといった問
題も起こる。For example, ester compounds of higher fatty acids have been conventionally used in order to reduce friction and impart durability to a portion that slides at high speed. However, by using this, the friction of the portion that slides at a low speed increases and the running performance deteriorates. Further, when the addition amount is large, there is a problem that the binder is plasticized and the durability is deteriorated. Furthermore, when the amount of addition is large, the pores necessary for effectively supplying the lubricant to the sliding surface are reduced by the calendering process, which is performed for the purpose of making the surface of the tape a mirror surface and filling the ferromagnetic powder highly. Alternatively, there is also a problem that the amount of the lubricant that is clogged and effectively acts decreases rather, and the durability deteriorates.
【０００９】このような問題を解決するために、使用す
る強磁性金属粉末の比表面積と磁性層の表面粗さを規制
することで電磁変換特性を高め、更に用いる潤滑剤量を
規制し走行性及び耐久性を満足させながら電磁変換特性
を向上しようとする方法も提案されている（例えば特公
平４−４０７８１号公報等参照。）。In order to solve such a problem, the electromagnetic conversion characteristics are enhanced by regulating the specific surface area of the ferromagnetic metal powder used and the surface roughness of the magnetic layer, and the amount of lubricant used is further regulated to improve the running property. Also, a method for improving electromagnetic conversion characteristics while satisfying durability has been proposed (see, for example, Japanese Patent Publication No. 40781/1992).
【００１０】しかし、更に電磁変換特性を向上させよう
として磁性層の表面粗さをより小さい値に規制しようと
した場合には、単に使用する潤滑剤量のみを規制するだ
けでは、有効に作用できる潤滑剤量を制御できず、走行
性と耐久性を両立させることは困難であった。However, when the surface roughness of the magnetic layer is to be controlled to a smaller value in order to further improve the electromagnetic conversion characteristics, effective control can be achieved by simply controlling the amount of lubricant used. The amount of lubricant could not be controlled, and it was difficult to achieve both runnability and durability.
【００１１】また、カレンダー処理を終えた磁性塗膜に
トップコートして耐久性に十分な量の高級脂肪酸のエス
テル化合物を磁性塗膜に付与する方法も提案されている
（例えば特開平４−３３１７号公報等参照。）。A method has also been proposed in which a magnetic coating film which has been subjected to calendering is top-coated to give an ester compound of a higher fatty acid in an amount sufficient for durability to the magnetic coating film (for example, JP-A-4-3317). See the bulletin, etc.).
【００１２】ところが、磁性塗膜の乾燥後にトップコー
トして耐久性に十分な量の高級脂肪酸のエステル化合物
を磁性塗膜に付与する方法は、製造工程が増えてしまう
とともに、鏡面化された場合には、隙間が少ない表面に
多量の高級脂肪酸のエステル化合物が存在するために低
速で摺動する部分の摩擦が大幅に上昇してしまい走行性
が悪化するという問題がある。However, the method of top-coating after drying the magnetic coating film and applying an ester compound of a higher fatty acid to the magnetic coating film in an amount sufficient for durability increases the number of manufacturing steps and also when the surface is mirror-finished. Has a problem that since a large amount of ester compound of higher fatty acid is present on the surface with few gaps, friction at a portion sliding at a low speed is significantly increased and traveling performance is deteriorated.
【００１３】[0013]
【発明が解決しようとする課題】そこで、本発明は、こ
のような実情に鑑みて提案されたものであって、電磁変
換特性の向上を達成するために媒体表面を鏡面化した場
合でも、十分な走行性及び耐久性を有する磁気記録媒体
を提供する事を目的とする。Therefore, the present invention has been proposed in view of such circumstances, and is sufficient even when the medium surface is mirror-finished in order to achieve the improvement of electromagnetic conversion characteristics. An object of the present invention is to provide a magnetic recording medium having excellent running property and durability.
【００１４】[0014]
【課題を解決するための手段】本発明者等は、上述の目
的を達成せんものと鋭意研究の結果、磁性層の表面性を
一定の値以下に抑えるとともに、磁性塗料中に含まれる
強磁性粉末その他の無機顔料と結合剤との比率を規制す
ることにより、良好な電磁変換特性を確保しつつ、十分
な走行性及び耐久性を実現できることをみいだし、本発
明を完成するに至ったものである。Means for Solving the Problems As a result of earnest studies that the above-mentioned objects cannot be achieved, the inventors of the present invention have suppressed the surface property of the magnetic layer to a certain value or less, and have a ferromagnetic property contained in the magnetic coating material. By controlling the ratio of the powder and other inorganic pigments and the binder, it was found that sufficient runnability and durability can be realized while ensuring good electromagnetic conversion characteristics, and the present invention has been completed. Is.
【００１５】即ち、本発明の磁気記録媒体は、非磁性支
持体上に強磁性粉末と結合剤とを主体とする磁性塗料の
塗膜からなる磁性層が形成されてなる磁気記録媒体にお
いて、上記磁性塗料中に含まれる強磁性粉末その他の無
機顔料と結合剤との比率が重量比で無機顔料／結合剤＝
５．７５〜６．７５であり、且つ上記磁性層の表面粗度
Ｒａが５．０ｎｍ以下であるとともに、潤滑剤が上記強
磁性粉末１００重量部に対して１．５重量部以上３．０
重量部以下の割合で含まれていることを特徴とするもの
である。That is, the magnetic recording medium of the present invention is a magnetic recording medium comprising a non-magnetic support and a magnetic layer formed of a coating film of a magnetic paint mainly composed of a ferromagnetic powder and a binder. The ratio of the ferromagnetic powder and other inorganic pigments contained in the magnetic paint to the binder is a weight ratio of inorganic pigment / binder =
5.75 to 6.75, the surface roughness Ra of the magnetic layer is 5.0 nm or less, and the lubricant is 1.5 parts by weight or more and 3.0 parts by weight or more with respect to 100 parts by weight of the ferromagnetic powder.
It is characterized in that it is contained in a ratio of less than or equal to parts by weight.
【００１６】上記潤滑剤としては、高級脂肪酸エステル
が好適である。As the above lubricant, higher fatty acid ester is preferable.
【００１７】ここで、上記高級脂肪酸エステルとして、
炭素数１６以上２２以下の高級脂肪酸とネオペンチルア
ルコールとのエステル化合物が最も好ましいが、炭素数
１０以上２４以下の一塩基性脂肪酸（分岐していても、
不飽和結合を含んでいても良い。）と炭素数１以上１８
以下の一価のアルコール（分岐していても、不飽和結合
を含んでいても良い。）やアルキレンオキサイドのモノ
アルキルエーテルとからなるエステル化合物でも良い。
これらを用いることにより、その他の高級脂肪酸エステ
ルと同じ量が存在した場合でも低速で摺動する部分の摩
擦をより低く抑え、且つ耐久性に優れた油膜を形成する
ことができる。このため、より一層走行性及び耐久性の
向上を図ることができる。Here, as the higher fatty acid ester,
An ester compound of a higher fatty acid having 16 to 22 carbon atoms and neopentyl alcohol is most preferable, but a monobasic fatty acid having 10 to 24 carbon atoms (even if branched,
It may contain an unsaturated bond. ) And carbon number 1 or more 18
An ester compound composed of the following monohydric alcohol (which may be branched or may contain an unsaturated bond) or a monoalkyl ether of alkylene oxide may be used.
By using these, even when the same amount as other higher fatty acid ester is present, the friction of the portion that slides at a low speed can be further suppressed, and an oil film having excellent durability can be formed. Therefore, it is possible to further improve the running property and the durability.
【００１８】これらエステル化合物として、具体的に例
示するならばステアリン酸メチル、ステアリン酸エチ
ル、ステアリン酸プロピル、ステアリン酸ブチル、ステ
アリン酸ｓｅｃ−ブチル、ステアリン酸ｔｅｒｔ−ブチ
ル、ステアリン酸イソブチル、ステアリン酸ペンチル、
ステアリン酸ヘプチル、ステアリン酸オクチル、ステア
リン酸ブトキシエチル、パリミチン酸ブチル、パルミチ
ン酸ペンチル、パルミチン酸ヘプチル、パルミチン酸オ
クチル、パルミチン酸イソオクチル、ミリスチン酸オク
チル、オレイン酸オレイル等が挙げられる。Specific examples of these ester compounds include methyl stearate, ethyl stearate, propyl stearate, butyl stearate, sec-butyl stearate, tert-butyl stearate, isobutyl stearate, pentyl stearate. ,
Examples include heptyl stearate, octyl stearate, butoxyethyl stearate, butyl palmitate, pentyl palmitate, heptyl palmitate, octyl palmitate, isooctyl palmitate, octyl myristate, oleyl oleate and the like.
【００１９】その他の潤滑剤として、上記高級脂肪酸エ
ステルの他に従来公知のものを組み合わせて使用するこ
とも可能である。As the other lubricant, it is possible to use a conventionally known one in combination with the above-mentioned higher fatty acid ester.
【００２０】この従来公知の潤滑剤としては、例えばミ
リスチン酸やステアリン酸等の高級脂肪酸類及びそれら
の金属やアミンとの塩類、脂肪酸と１価又はそれ以上６
価までのアルコール類との本発明によるものを含めたエ
ステル化合物、脂肪酸等で変成したものを含むシリコン
オイル、アルキル燐酸エステル、これらにはエチレンオ
キサイド等の付加によりエーテル結合等他の置換基が含
まれても良いし、一部フッ素が含まれても良い。更に、
パフロロポリエーテル及びその変成物等が挙げられる。As the conventionally known lubricants, for example, higher fatty acids such as myristic acid and stearic acid, salts thereof with metals and amines, fatty acids and monovalent or higher 6
Ester compounds including those according to the present invention with alcohols up to the valency, silicone oils including those modified with fatty acids, etc., alkyl phosphates, and other substituents such as ether bonds due to addition of ethylene oxide, etc. May be contained, or a part of fluorine may be contained. Furthermore,
Examples include pafluoropolyether and its modified products.
【００２１】これらは、磁性塗料の混合・分散の初期、
途中、終了時のいずれに添加しても良く、更に磁性層が
形成された後にトップコートしても良い。These are the initial stage of mixing and dispersing the magnetic paint,
It may be added either during the process or at the end of the process, and may be top-coated after the magnetic layer is formed.
【００２２】本発明においては、磁性層の表面を鏡面化
し表面性を一定の値以下に規制することで良好な電磁変
換特性を得るとともに、結合剤に対する無機顔料の配合
割合を一定範囲内に調整することにより走行性及び耐久
性を向上することができる。In the present invention, the surface of the magnetic layer is mirror-finished and the surface property is regulated to a certain value or less to obtain good electromagnetic conversion characteristics, and the compounding ratio of the inorganic pigment to the binder is adjusted within a certain range. By doing so, the running property and durability can be improved.
【００２３】一般に、塗布型の磁気記録媒体のように無
機顔料と高分子化合物である結合剤とからなる複合材料
の場合、結合剤に対する無機顔料の配合割合がある一定
値を越えると空隙や空孔が生じ、これらは配合割合が大
きくなるほど多くなる傾向にある。上記磁気記録媒体に
おいては、初めから摺動面に存在する潤滑剤量が摺動に
より減少した場合に、上述の空隙や空孔を通して潤滑剤
が摺動面に供給され耐久性に有効に作用すると考えられ
ている。Generally, in the case of a composite material composed of an inorganic pigment and a binder which is a high molecular compound such as a coating type magnetic recording medium, when the mixing ratio of the inorganic pigment to the binder exceeds a certain value, voids or voids are formed. Porosity occurs, and these tend to increase as the blending ratio increases. In the above magnetic recording medium, when the amount of lubricant existing on the sliding surface from the beginning is reduced by sliding, the lubricant is effectively supplied to the sliding surface through the above-mentioned voids and pores and effectively acts on the durability. It is considered.
【００２４】本発明では、上記磁性塗料中に含まれる強
磁性粉末その他の無機顔料と結合剤との比率を無機顔料
／結合剤＝５．７５〜６．７５（重量比）とする。これ
により、カレンダー処理時に上記空隙や空孔が縮小又は
閉塞されることなく、強磁性粉末の充填率や塗膜の機械
強度の低下が抑えられた範囲で潤滑剤を摺動面に供給す
るに十分な空隙や空孔を確保することができる。この結
果、潤滑剤が摺動面だけでなく空孔や空隙内にも散在
し、初めから摺動面に存在する潤滑剤量は少なくなる。
従って、表面が鏡面化された媒体でも低速で摺動する部
分の摩擦を低く抑えることができる。この時、初めから
摺動面に存在する潤滑剤量が少なくても、摺動によりそ
の量が減少すると上記空隙や空孔を通して該潤滑剤が摺
動面に供給されるので、十分な耐久性を確保できる。In the present invention, the ratio of the ferromagnetic powder and other inorganic pigments contained in the magnetic paint to the binder is inorganic pigment / binder = 5.75 to 6.75 (weight ratio). As a result, the lubricant can be supplied to the sliding surface within a range in which the voids and pores are not reduced or blocked during the calendering process and the decrease in the filling rate of the ferromagnetic powder and the mechanical strength of the coating film is suppressed. It is possible to secure sufficient voids and holes. As a result, the lubricant is scattered not only on the sliding surface but also in the holes and voids, and the amount of the lubricant existing on the sliding surface from the beginning is reduced.
Therefore, even if the medium has a mirror-finished surface, it is possible to reduce the friction of the portion that slides at a low speed. At this time, even if the amount of lubricant existing on the sliding surface is small from the beginning, the lubricating agent is supplied to the sliding surface through the voids and holes when the amount decreases due to sliding, so sufficient durability is ensured. Can be secured.
【００２５】上記無機顔料／結合剤比が５．７５未満で
は、上記空隙や空孔を十分に確保することができず、摺
動面に潤滑剤を十分に供給することができなくなり、耐
久性が低下する。逆に、該無機顔料／結合剤比が６．７
５を越えると、結合剤の強磁性粉末への吸着量が減少し
て塗料の段階での分散の安定性が悪化したり、生じる空
隙や空孔が多くなりすぎて初めから摺動面に存在する潤
滑剤量が少なくなり過ぎるばかりか、強磁性粉末の充填
率や塗膜の機械強度が大幅に低下し電磁変換特性及び耐
久性が低下する。If the inorganic pigment / binder ratio is less than 5.75, the voids and pores cannot be sufficiently secured, and the lubricant cannot be sufficiently supplied to the sliding surface, resulting in durability. Is reduced. Conversely, the inorganic pigment / binder ratio is 6.7.
If it exceeds 5, the amount of the binder adsorbed on the ferromagnetic powder decreases, the stability of the dispersion at the stage of the coating deteriorates, and the number of voids and voids generated becomes too large, and it exists on the sliding surface from the beginning. Not only the amount of the lubricant to be used becomes too small, but also the filling rate of the ferromagnetic powder and the mechanical strength of the coating film are significantly reduced, and the electromagnetic conversion characteristics and durability are reduced.
【００２６】上記磁性層の表面性は、その表面粗度Ｒａ
が５．０ｎｍ以下であることが必要であり、より好まし
くはＲｚが７０ｎｍ以下とされる。これにより、記録・
再生時のスペーシングロスが抑えられ良好な電磁変換特
性を得ることができる。表面粗度が上記範囲を越える
と、良好な電磁変換特性を確保することができなくな
る。The surface property of the magnetic layer is the surface roughness Ra.
Is 5.0 nm or less, and more preferably Rz is 70 nm or less. This will record
Spacing loss during reproduction is suppressed, and good electromagnetic conversion characteristics can be obtained. If the surface roughness exceeds the above range, good electromagnetic conversion characteristics cannot be ensured.
【００２７】このように磁性層の表面性を規制するに
は、使用する原材料や工程を鏡面化の方向に選定すれば
良い。In order to control the surface property of the magnetic layer as described above, the raw materials and processes to be used may be selected in the mirror-finishing direction.
【００２８】つまり、原材料としては、強磁性粉末や研
磨剤は微細なものなので分散が容易なものを選定し、結
合剤はこれらを均一に分散できるようなもの、具体的に
は強磁性粉末により吸着し易いように強磁性粉末の表面
に合った種類及び量の極性基が導入されたものを選定す
る。また、非磁性支持体は、表面性の良好なものを選定
すれば良い。That is, as the raw material, the ferromagnetic powder and the abrasive are fine, and therefore those which are easy to disperse are selected, and the binder is one which can disperse these uniformly, specifically, the ferromagnetic powder. The type and amount of polar groups suitable for the surface of the ferromagnetic powder are introduced so as to facilitate adsorption. Further, as the non-magnetic support, one having a good surface property may be selected.
【００２９】また、工程としては、強磁性粉末を均一に
分散できるように高いせん断力を与えられるような分散
機の使用や分散時間等の条件の選定、カレンダー処理圧
力や温度の上昇等の手法を適宜使用すれば良い。In the process, methods such as the use of a disperser capable of giving a high shearing force to uniformly disperse the ferromagnetic powder, selection of conditions such as dispersion time, and increase of calendering pressure and temperature are carried out. May be used as appropriate.
【００３０】この他、磁性層の表面を鏡面化する公知の
手法を含めた中から、走行性や生産性、その他の特性と
のバランスを考慮して任意に選定することができ、特定
の手法に限定されない。In addition to the above, a known method for mirror-finishing the surface of the magnetic layer can be selected in consideration of the balance with running property, productivity, and other characteristics, and a specific method can be selected. Not limited to.
【００３１】また、この磁性層に含まれる潤滑剤量は、
強磁性粉末１００重量部に対して１．５重量部以上３．
０重量部以下とされる。潤滑剤量を上記範囲内とするこ
とにより、摺動面に供給される潤滑剤量が十分となる
上、初めから多量に摺動面に存在しないので、低速での
摩擦の上昇も抑えることができる。該潤滑剤量が１．５
重量よりも少ないと十分な潤滑効果を得ることができ
ず、逆に３．０重量部より多いと摺動面に初めから多量
に存在してしまうため、低速での摩擦が上昇する。The amount of lubricant contained in this magnetic layer is
1.5 parts by weight or more per 100 parts by weight of ferromagnetic powder 3.
It is set to 0 parts by weight or less. By setting the amount of lubricant within the above range, the amount of lubricant supplied to the sliding surface is sufficient, and since there is not a large amount of lubricant on the sliding surface from the beginning, it is possible to suppress the increase in friction at low speeds. it can. The amount of lubricant is 1.5
If the amount is less than the weight, a sufficient lubricating effect cannot be obtained, and conversely, if the amount is more than 3.0 parts by weight, a large amount is present on the sliding surface from the beginning, and friction at low speed increases.
【００３２】本発明の磁気記録媒体において、上記非磁
性支持体や磁性塗膜を構成する強磁性粉末等は従来公知
のものがいずれも使用可能であり、なんら限定されるも
のではない。In the magnetic recording medium of the present invention, conventionally known materials can be used as the non-magnetic support and the magnetic powder forming the magnetic coating film, but the present invention is not limited thereto.
【００３３】具体的に例示するならば、強磁性粉末とし
てはＦｅ，Ｃｏ，Ｎｉ等の金属やこれらを含んだ合金か
らなる強磁性金属粉末、バリウムフェライト等の板状六
方晶フェライト、γ−酸化鉄、コバルト含有γ−酸化
鉄、マグネタイト、コバルト含有マグネタイト、ＣｒＯ
2 等が挙げられる。As a specific example, the ferromagnetic powder is a ferromagnetic metal powder made of a metal such as Fe, Co, or Ni, or an alloy containing these, a plate-like hexagonal ferrite such as barium ferrite, or γ-oxidation. Iron, cobalt-containing γ-iron oxide, magnetite, cobalt-containing magnetite, CrO
2 etc.
【００３４】上記その他の無機顔料としては、研磨剤や
カーボンブラック、二硫化モリブデンやグラファイト等
の固体潤滑剤等が挙げられる。Examples of the above-mentioned other inorganic pigments include abrasives, carbon black, and solid lubricants such as molybdenum disulfide and graphite.
【００３５】上記研磨剤としては、アルミナ、酸化クロ
ム、酸化チタン、α−酸化鉄、炭化ケイ素、コランダ
ム、（人造）ダイヤモンド、等が挙げられる。Examples of the abrasive include alumina, chromium oxide, titanium oxide, α-iron oxide, silicon carbide, corundum, (artificial) diamond and the like.
【００３６】これらは粉体状態で磁性塗料に添加しても
良いし、強磁性粉末とは別に分散したスラリー状態で磁
性塗料の混合・分散の初期、途中、終了時のいずれに添
加しても良い。These may be added to the magnetic coating material in a powder state, or may be added to the magnetic coating material in the form of a slurry dispersed separately from the ferromagnetic powder at any of the initial stage, the middle stage, and the final stage of the mixing / dispersion of the magnetic coating material. good.
【００３７】上記結合剤としては、通常の塗布型の磁気
記録媒体に使用されるものとして従来公知の材料がいず
れも使用可能であり、特に限定されない。As the above-mentioned binder, any of the materials conventionally known as those used in ordinary coating type magnetic recording media can be used, and there is no particular limitation.
【００３８】具体的に例示するならばポリエステルやポ
リカーボネート又はポリエーテル系のポリウレタン樹
脂、ポリエステル樹脂、塩化ビニル系共重合体、セルロ
ース誘導体、フェノキシ樹脂、アクリル酸エステル系共
重合体、塩化ビニリデン系共重合体、スチレン−ブタジ
エン共重合体等が挙げられる。Specific examples include polyester resins, polycarbonate or polyether polyurethane resins, polyester resins, vinyl chloride copolymers, cellulose derivatives, phenoxy resins, acrylic ester copolymers, vinylidene chloride copolymer copolymers. Examples thereof include coalesce and styrene-butadiene copolymer.
【００３９】ここで、良好な分散性を得るために、使用
する結合剤の一部又は全部に極性基が導入されても良
い。Here, in order to obtain good dispersibility, a polar group may be introduced into a part or all of the binder used.
【００４０】上記極性基としては、例えば−ＣＯＯＭ、
−ＳＯ3 Ｍ、−Ｏ−ＳＯ3 Ｍ、−Ｐ＝Ｏ（ＯＭ）2 、−
ＮＲ4 Ｘ，−ＮＲ2 、−ＳＨ（ＭはＨ，Ｌｉ，Ｎａ，
Ｋ，−ＮＲ4 、Ｒはアルキル基又はＨ、Ｘはハロゲン原
子をそれぞれ表す。）等が挙げられる。これらは１種類
でも、２種類以上含まれても良い。Examples of the polar group include -COOM,
-SO 3 M, -O-SO 3 M, -P = O (OM) 2, -
NR 4 X, -NR 2, -SH (M is H, Li, Na,
K, -NR 4, R represents an alkyl group or H, X is a halogen atom, respectively. ) And the like. These may be included in one kind or in two or more kinds.
【００４１】これら極性基の導入量は、結合剤１ｇ当た
り０．０３〜０．３ｍｍｏｌが好ましい。結合剤１ｇ当
たり０．０３ｍｍｏｌより少ないと分散性に対する効果
が小さく、逆に０．３ｍｍｏｌより多いと吸湿性が高く
なり、耐候性が悪くなるばかりか、かえって分散性が悪
化する虞れがある。The introduction amount of these polar groups is preferably 0.03 to 0.3 mmol per 1 g of the binder. If it is less than 0.03 mmol per 1 g of the binder, the effect on the dispersibility is small, and if it is more than 0.3 mmol, the hygroscopicity becomes high and the weather resistance is deteriorated, and the dispersibility may be deteriorated.
【００４２】また、上記結合剤に架橋構造を形成するた
めには、硬化剤としてポリイソシアネートを添加しても
良い。In order to form a crosslinked structure in the binder, polyisocyanate may be added as a curing agent.
【００４３】上記ポリイソシアネートとしては、例えば
トリレンジイソシアネート、４，４’−ジフェニルメタ
ンジイソシアネート、ヘキサメチレンジイソシアネー
ト、イソホロンジイソシアネート等のイソシアネート類
及びこれらのイソシアネート類とトリメチロールプロパ
ン等の多価アルコールとの付加体又はイソシアネート類
の縮合生成物等が使用可能である。Examples of the above polyisocyanate include isocyanates such as tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate, and adducts of these isocyanates with polyhydric alcohols such as trimethylolpropane. Alternatively, condensation products of isocyanates can be used.
【００４４】本発明においては、その他の添加剤として
上述の研磨剤やカーボンブラック等の帯電防止効果や遮
光効果に摩擦低減効果等のあるものや、分散効果、架橋
促進効果、可塑効果等を目的として従来公知の各種材料
が使用されても良い。In the present invention, other additives such as the above-mentioned abrasives and carbon black having an antistatic effect, a light shielding effect and a friction reducing effect, a dispersing effect, a crosslinking promoting effect, a plasticizing effect and the like are intended. As the above, various conventionally known materials may be used.
【００４５】また、上記非磁性支持体としては、ポリエ
チレンテレフタレート、ポリエチレン−２，６−ナフタ
レート等のポリエステル類、アラミド等のポリアミド又
はイミド類、ポリプロピレン等のポリオレフィン類、セ
ルローストリアセテート、セルロースジアセテート等の
セルロース類やポリカーボネート類に代表されるような
高分子材料、或いはアルミニウム等の金属、ガラス、セ
ラミクス等により形成される支持体等が挙げられる。Examples of the non-magnetic support include polyesters such as polyethylene terephthalate and polyethylene-2,6-naphthalate, polyamides or imides such as aramid, polyolefins such as polypropylene, cellulose triacetate and cellulose diacetate. Examples thereof include polymeric materials typified by celluloses and polycarbonates, supports such as metals such as aluminum, glass, and ceramics.
【００４６】これら非磁性支持体上に磁性層を形成する
には、上述の磁性層構成材料を塗料化し、これを上記非
磁性支持体上に塗布し乾燥して形成されるが、この塗料
化に際し、使用される溶剤としては、例えばアセトン、
メトルエチルケトン、メチルイソブチルケトン、シクロ
ヘキサノン等のケトン系溶媒、メタノール、エタノー
ル、プロパノール、イソプロパノール等のアルコール系
溶媒、酢酸メチル、酢酸エチル、酢酸ブチル、酢酸プロ
ピル、乳酸エチル、エチレングリコールアセテート等の
エステル系溶媒、ジエチレングリコールジメチルエーテ
ル、ジエチレングリコールモノエチルエーテル、２−エ
トキシエタノール、テトラヒドロフラン、ジオキサン等
のエーテル系溶媒、ベンゼン、トルエン、キシレン等の
芳香族炭化水素系溶媒、メチレンクロライド、四塩化炭
素、クロロホルム、クロロベンゼン等のハロゲン化炭化
水素系溶媒等が使用可能である。To form a magnetic layer on these non-magnetic supports, the above-mentioned magnetic layer-constituting material is made into a coating material, which is then applied onto the above-mentioned non-magnetic support material and dried to form a coating material. In this case, the solvent used is, for example, acetone,
Ketone-based solvents such as methol ethyl ketone, methyl isobutyl ketone and cyclohexanone, alcohol-based solvents such as methanol, ethanol, propanol and isopropanol, ester-based solvents such as methyl acetate, ethyl acetate, butyl acetate, propyl acetate, ethyl lactate and ethylene glycol acetate. Solvents, ether solvents such as diethylene glycol dimethyl ether, diethylene glycol monoethyl ether, 2-ethoxyethanol, tetrahydrofuran, dioxane, aromatic hydrocarbon solvents such as benzene, toluene, xylene, methylene chloride, carbon tetrachloride, chloroform, chlorobenzene, etc. A halogenated hydrocarbon solvent or the like can be used.
【００４７】また、上記塗料を調製するための分散・混
練には、例えばロールミル、ボールミル、サンドミル、
アジター、ニーダー、エクストルーダー、ホモジナイザ
ー、超音波分散機等が用いられる。The dispersion / kneading for preparing the above-mentioned coating material is carried out, for example, by a roll mill, a ball mill, a sand mill,
An agitator, kneader, extruder, homogenizer, ultrasonic disperser, etc. are used.
【００４８】更に、このように調製された塗料を上記非
磁性支持体上に塗布するには、グラビアコーター、ナイ
フコーター、ワイヤーバーコーター、ドクターブレード
コーター、リバースロールコーター、ディッピングコー
ター、エアナイフコーター、ダイコーター等が用いられ
る。Further, to apply the coating material thus prepared on the above non-magnetic support, a gravure coater, a knife coater, a wire bar coater, a doctor blade coater, a reverse roll coater, a dipping coater, an air knife coater, a die coater. And the like are used.
【００４９】また、上記磁性層は単層であっても良い
し、２層以上の多層であっても良い。更に、上記非磁性
支持体上の磁性層と同じ側にα−酸化鉄、カーボンブラ
ック、酸化チタン、炭酸カルシウム、アルミナ等の非磁
性又は磁性の非常に小さい粉末と結合剤とを主体とする
下塗り層を設けても良い。The magnetic layer may be a single layer or a multilayer of two or more layers. Further, an undercoat mainly comprising a non-magnetic or very small magnetic powder such as α-iron oxide, carbon black, titanium oxide, calcium carbonate and alumina and a binder on the same side as the magnetic layer on the non-magnetic support. Layers may be provided.
【００５０】以上が本発明の基本的な構成であるが、磁
気記録媒体の構成はこれに限らず、例えば非磁性支持体
の磁性層形成面側との反対面に非磁性又は磁性粉末と結
合剤とを主体とするバックコート層が形成されても良
い。The above is the basic constitution of the present invention, but the constitution of the magnetic recording medium is not limited to this. For example, nonmagnetic or magnetic powder is bonded to the surface of the nonmagnetic support opposite to the magnetic layer forming surface. A back coat layer containing an agent as a main component may be formed.
【００５１】このバックコート層に使用する非磁性粉末
としては、例えばカーボンブラックを主体とするものが
一般的であるが、この他にも炭酸カルシウム、アルミ
ナ、酸化チタン、α−酸化鉄等がいずれも使用可能であ
る。また、磁性粉末としては、磁性層の構成材料として
使用する上述の強磁性粉末がいずれも使用可能であり、
それらを単独又は組み合わせて使用することが可能であ
る。結合剤及びその他の添加剤としては、磁性層に用い
るものとして先に例示したものがいずれも使用可能であ
り、それらを単独又は組み合わせて使用することが可能
である。The non-magnetic powder used in the back coat layer is generally composed mainly of carbon black, but in addition to this, calcium carbonate, alumina, titanium oxide, α-iron oxide and the like are also used. Can also be used. Further, as the magnetic powder, any of the above-mentioned ferromagnetic powders used as a constituent material of the magnetic layer can be used,
It is possible to use them alone or in combination. As the binder and other additives, any of those exemplified above for the magnetic layer can be used, and they can be used alone or in combination.
【００５２】[0052]
【作用】磁性層の表面を鏡面化し表面性を一定の値以下
に規制することにより、記録及び再生時のスペーシング
ロスが抑えられ、良好な電磁変換特性が得られる。By making the surface of the magnetic layer mirror-like and limiting the surface property to a certain value or less, spacing loss during recording and reproduction can be suppressed, and good electromagnetic conversion characteristics can be obtained.
【００５３】また、結合剤に対する無機顔料の配合割合
を一定範囲内に調整することにより、強磁性粉末の充填
率や塗膜の機械強度の低下が抑えられた範囲で、潤滑剤
を摺動面に供給するのに十分な空孔を確保することがで
きる。上記潤滑剤は、摺動面だけでなく、上記空孔にも
散在するため、初めから摺動面に存在する高級脂肪酸の
エステル化合物の存在量は強磁性粉末１００重量部に対
して１．５重量部以上３．０重量部以下の添加量の範囲
では少ない。このため、表面が鏡面化された媒体でも低
速で摺動する部分の摩擦を低く抑えることができる。初
めから摺動面に存在する高級脂肪酸のエステル化合物の
剤量が少なくても、摺動により減少した場合には、上記
空孔を通して高級脂肪酸のエステル化合物が摺動面に供
給されるため、十分な耐久性を確保できる。Further, by adjusting the blending ratio of the inorganic pigment to the binder within a certain range, the lubricant is slid on the sliding surface within a range in which the filling rate of the ferromagnetic powder and the mechanical strength of the coating film are suppressed from decreasing. Sufficient holes can be secured to supply to. Since the lubricant is scattered not only on the sliding surface but also on the pores, the amount of the higher fatty acid ester compound existing on the sliding surface from the beginning is 1.5 per 100 parts by weight of the ferromagnetic powder. It is small in the range of addition amount of from 3.0 parts by weight to 3.0 parts by weight. Therefore, even in the medium having a mirror-finished surface, it is possible to suppress the friction of the portion that slides at a low speed. Even if the amount of the ester compound of higher fatty acid existing on the sliding surface from the beginning is small, if the amount of ester compound of higher fatty acid decreases due to sliding, the ester compound of higher fatty acid is supplied to the sliding surface through the pores, so it is sufficient. It can ensure excellent durability.
【００５４】従って、電磁変換特性に優れ且つ良好な走
行性及び耐久性が得られる。Therefore, it is possible to obtain excellent running characteristics and durability with excellent electromagnetic conversion characteristics.
【００５５】[0055]
【実施例】以下、本発明を具体的な実施例により説明す
るが、本発明がこの実施例に限定されるものでないこと
は言うまでもない。EXAMPLES The present invention will be described below with reference to specific examples, but it goes without saying that the present invention is not limited to these examples.
【００５６】実施例１ 先ず、下記の表１に示す組成の塗料材料をサンドミルに
より分散した後、硬化剤（日本ポリウレタン社製、商品
名；コロネートＬ）を３重量部添加し、これを厚み７．
５μｍのＰＥＴ（ポリエチレンテレフタレート）フィル
ム上に乾燥後の厚みが２．５μｍとなるように塗布し
た。 Example 1 First, a coating material having the composition shown in Table 1 below was dispersed by a sand mill, and then 3 parts by weight of a curing agent (manufactured by Nippon Polyurethane Industry Co., Ltd .; Coronate L) was added to give a thickness of 7 ．
It was applied on a PET (polyethylene terephthalate) film of 5 μm so that the thickness after drying was 2.5 μm.
【００５７】[0057]
【表１】 [Table 1]
【００５８】その後、磁場配向処理を行い、乾燥させて
巻き取りを行った。Thereafter, a magnetic field orientation treatment was performed, and the film was dried and wound.
【００５９】続いて、処理温度１１０℃、線圧力３５０
ｋｇ／ｃｍでカレンダー処理を施し、温度６０℃、２０
時間の硬化処理を行い磁性層を形成した。Subsequently, the processing temperature is 110 ° C. and the linear pressure is 350.
Calendared at kg / cm, temperature 60 ℃, 20
Curing treatment was carried out for a time to form a magnetic layer.
【００６０】そして、下記の表２に示す組成を有するバ
ックコート層を厚さ０．５μｍとなるように形成した。Then, a back coat layer having the composition shown in Table 2 below was formed to have a thickness of 0.5 μm.
【００６１】[0061]
【表２】 [Table 2]
【００６２】このようにして得られた幅広テープを８ｍ
ｍ幅にスリットしてサンプルテープとし、Ｈｉ−８ビデ
オカセットに組み込んだ。The wide tape obtained in this way is 8 m
The sample tape was slit into a width of m and incorporated into a Hi-8 video cassette.
【００６３】実施例２ 上記実施例１における磁性塗料の組成中、ポリエステル
−ポリウレタンの配合量を６．２重量部、塩化ビニル系
共重合体の配合量を１２．５重量部とし、その他は実施
例１と同様にしてサンプルテープを作製し、Ｈｉ−８ビ
デオカセットに組み込んだ。 Example 2 In the composition of the magnetic paint in Example 1 above, the blending amount of polyester-polyurethane was 6.2 parts by weight and the blending amount of vinyl chloride copolymer was 12.5 parts by weight. A sample tape was prepared in the same manner as in Example 1 and incorporated into a Hi-8 video cassette.
【００６４】実施例３ 上記実施例１における磁性塗料の組成中、ポリエステル
−ポリウレタンの配合量を５．３重量部、塩化ビニル系
共重合体の配合量を１０．７重量部とし、その他は実施
例１と同様にしてサンプルテープを作製し、Ｈｉ−８ビ
デオカセットに組み込んだ。 Example 3 In the composition of the magnetic paint in Example 1 above, the blending amount of polyester-polyurethane was 5.3 parts by weight and the blending amount of vinyl chloride copolymer was 10.7 parts by weight. A sample tape was prepared in the same manner as in Example 1 and incorporated into a Hi-8 video cassette.
【００６５】実施例４ 上記実施例１における磁性塗料の組成中、研磨剤として
添加したアルミナの配合量を１２重量部とし、その他は
実施例１と同様にしてサンプルテープを作製し、Ｈｉ−
８ビデオカセットに組み込んだ。 Example 4 A sample tape was prepared in the same manner as in Example 1 except that the compounding amount of alumina added as an abrasive in the composition of the magnetic paint in Example 1 was 12 parts by weight.
It was incorporated into 8 video cassettes.
【００６６】実施例５ 上記実施例１におけるカレンダー処理時の処理温度を１
２５℃とし、その他は実施例１と同様にしてサンプルテ
ープを作製し、Ｈｉ−８ビデオカセットに組み込んだ。 Example 5 The processing temperature during the calendar process in Example 1 was set to 1
A sample tape was prepared in the same manner as in Example 1 except that the temperature was set to 25 ° C., and the sample tape was incorporated into a Hi-8 video cassette.
【００６７】実施例６ 上記実施例１における磁性塗料の組成中、更にカーボン
ブラック（平均粒径＝８２ｎｍ、ＤＢＰ吸油量＝５０ｃ
ｃ／１００ｇ）を０．５重量部添加し、その他は実施例
１と同様にしてサンプルテープを作製し、Ｈｉ−８ビデ
オカセットに組み込んだ。 Example 6 In the composition of the magnetic coating material in Example 1, carbon black (average particle size = 82 nm, DBP oil absorption = 50 c) was added.
c / 100 g) was added in an amount of 0.5 part by weight, and a sample tape was produced in the same manner as in Example 1 except for the above, and the sample tape was incorporated into a Hi-8 video cassette.
【００６８】実施例７ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルの添加量を１．５重量部とし、その他は実
施例１と同様にしてサンプルテープを作製し、Ｈｉ−８
ビデオカセットに組み込んだ。 Example 7 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was added in an amount of 1.5 parts by weight in the composition of the magnetic coating material in Example 1 above, and Hi-8 was used.
I built it into a video cassette.
【００６９】実施例８ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルの添加量を３．０重量部とし、その他は実
施例１と同様にしてサンプルテープを作製し、Ｈｉ−８
ビデオカセットに組み込んだ。 Example 8 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was added in an amount of 3.0 parts by weight in the composition of the magnetic paint in Example 1 above, and Hi-8 was used.
I built it into a video cassette.
【００７０】実施例９ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルをパルミチン酸ネオペンチルに変え、その
他は実施例１と同様にしてサンプルテープを作製し、Ｈ
ｉ−８ビデオカセットに組み込んだ。 Example 9 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was replaced with neopentyl palmitate in the composition of the magnetic paint in Example 1 above.
It was incorporated into an i-8 video cassette.
【００７１】実施例１０ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルをベヘン酸ネオペンチルに変え、その他は
実施例１と同様にしてサンプルテープを作製し、Ｈｉ−
８ビデオカセットに組み込んだ。 Example 10 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was changed to neopentyl behenate in the composition of the magnetic paint in Example 1 above, and Hi-
It was incorporated into 8 video cassettes.
【００７２】実施例１１ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルをステアリン酸ブチルに変え、その他は実
施例１と同様にしてサンプルテープを作製し、Ｈｉ−８
ビデオカセットに組み込んだ。 Example 11 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was replaced with butyl stearate in the composition of the magnetic paint in Example 1 above, and Hi-8 was used.
I built it into a video cassette.
【００７３】実施例１２ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルをステアリン酸ヘプチルに変え、その他は
実施例１と同様にしてサンプルテープを作製し、Ｈｉ−
８ビデオカセットに組み込んだ。 Example 12 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was replaced with heptyl stearate in the composition of the magnetic coating material in Example 1 above, and Hi-
It was incorporated into 8 video cassettes.
【００７４】実施例１３ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルをステアリン酸ブトキシエチルに変え、そ
の他は実施例１と同様にしてサンプルテープを作製し、
Ｈｉ−８ビデオカセットに組み込んだ。 Example 13 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was replaced with butoxyethyl stearate in the composition of the magnetic paint in Example 1 above.
It was incorporated into a Hi-8 video cassette.
【００７５】実施例１４ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルをパルミチン酸イソオクチルに変え、その
他は実施例１と同様にしてサンプルテープを作製し、Ｈ
ｉ−８ビデオカセットに組み込んだ。 Example 14 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate in the composition of the magnetic coating material in Example 1 was replaced with isooctyl palmitate.
It was incorporated into an i-8 video cassette.
【００７６】比較例１ 上記実施例１における磁性塗料の組成中、ポリエステル
−ポリウレタンの配合量を６．５重量部、塩化ビニル系
共重合体の配合量を１３．１重量部とし、その他は実施
例１と同様にしてサンプルテープを作製し、Ｈｉ−８ビ
デオカセットに組み込んだ。 Comparative Example 1 In the composition of the magnetic coating material of Example 1 above, the blending amount of polyester-polyurethane was 6.5 parts by weight and the blending amount of vinyl chloride copolymer was 13.1 parts by weight. A sample tape was prepared in the same manner as in Example 1 and incorporated into a Hi-8 video cassette.
【００７７】比較例２ 上記実施例１における磁性塗料の組成中、ポリエステル
−ポリウレタンの配合量を５．１重量部、塩化ビニル系
共重合体の配合量を１０．３重量部とし、その他は実施
例１と同様にしてサンプルテープを作製し、Ｈｉ−８ビ
デオカセットに組み込んだ。 Comparative Example 2 In the composition of the magnetic coating material in Example 1 above, the blending amount of polyester-polyurethane was 5.1 parts by weight, the blending amount of vinyl chloride copolymer was 10.3 parts by weight, and the others were carried out. A sample tape was prepared in the same manner as in Example 1 and incorporated into a Hi-8 video cassette.
【００７８】比較例３ 上記実施例１におけるカレンダー処理時の処理温度を９
５℃とし、その他は実施例１と同様にしてサンプルテー
プを作製し、Ｈｉ−８ビデオカセットに組み込んだ。 Comparative Example 3 The processing temperature during the calendar processing in Example 1 was set to 9
A sample tape was prepared in the same manner as in Example 1 except that the temperature was 5 ° C., and the sample tape was incorporated into a Hi-8 video cassette.
【００７９】比較例４ 上記実施例１における磁性塗料の組成中、更にカーボン
ブラック（平均粒径＝２７０ｎｍ、ＤＢＰ吸油量＝３７
ｃｃ／１００ｇ）を２．０重量部添加し、その他は実施
例１と同様にしてサンプルテープを作製し、Ｈｉ−８ビ
デオカセットに組み込んだ。 Comparative Example 4 In the composition of the magnetic coating material of Example 1, carbon black (average particle size = 270 nm, DBP oil absorption = 37) was added.
cc / 100 g) was added in an amount of 2.0 parts by weight, and a sample tape was prepared in the same manner as in Example 1 except for the above, and the tape was incorporated into a Hi-8 video cassette.
【００８０】比較例５ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルの添加量を１．０重量部とし、その他は実
施例１と同様にしてサンプルテープを作製し、Ｈｉ−８
ビデオカセットに組み込んだ。 Comparative Example 5 A sample tape was prepared in the same manner as in Example 1 except that the amount of neopentyl stearate added in the composition of the magnetic coating material in Example 1 was 1.0 part by weight, and Hi-8 was used.
I built it into a video cassette.
【００８１】比較例６ 上記実施例１における磁性塗料の組成中、ステアリン酸
ネオペンチルの添加量を４．０重量部とし、その他は実
施例１と同様にしてサンプルテープを作製し、Ｈｉ−８
ビデオカセットに組み込んだ。 Comparative Example 6 A sample tape was prepared in the same manner as in Example 1 except that neopentyl stearate was added in an amount of 4.0 parts by weight in the composition of the magnetic coating material in Example 1 above, and Hi-8 was used.
I built it into a video cassette.
【００８２】そこで、得られた各サンプルテープについ
て、電磁変換特性としてＹ−Ｃ／Ｎ及びドロップアウト
について以下に示す方法で評価を行った。Therefore, each of the obtained sample tapes was evaluated for YC / N and dropout as electromagnetic conversion characteristics by the following method.
【００８３】＜Ｙ−Ｃ／Ｎ＞Ｈｉ−８ビデオデッキを用
い、７ＭＨｚの信号を１０分間記録した。そして、リミ
ッター前に検出した７ＭＨｚでの出力とそこから−１Ｍ
Ｈｚのノイズとの差を求めてＹ−Ｃ／Ｎとし、比較例３
の結果を０ｄＢとした時の相対値にて表した。この結果
を下記表３、表４に示す。<YC / N> A Hi-8 video deck was used to record a 7 MHz signal for 10 minutes. And the output at 7MHz detected before the limiter and -1M from there
The difference with the noise of Hz was obtained and set as Y-C / N.
The result was expressed as a relative value when 0 dB was set. The results are shown in Tables 3 and 4 below.
【００８４】[0084]
【表３】 [Table 3]
【００８５】[0085]
【表４】 [Table 4]
【００８６】＜摩擦係数＞磁性面と３ｍｍΦのＳＵＳ３
０４ガイドピンとの摩擦係数を以下の条件で測定し、３
０回走行後の値を上記表３に併せて記した。<Frictional coefficient> Magnetic surface and SUS3 of 3 mmΦ
04 Measure the friction coefficient with the guide pin under the following conditions, and
The values after running 0 times are also shown in Table 3 above.
【００８７】 測定環境 ；温度４０℃、相対湿度８０％ＲＨ テープ速度 ；２０ｍｍ／秒 荷重 ；２０ｇ 抱き角 ；９０°° ＜スチル時間＞長時間スチルができるように改造したＨ
ｉ−８ビデオデッキを用いて、温度４０℃、相対湿度８
０％ＲＨの環境下でＲＦ出力が初期から３ｄＢ減衰する
までの時間を求めスチル時間とした。１サンプルにつき
３回の測定を行い、その平均値を上記表３に併せて記し
た。Measurement environment; temperature 40 ° C., relative humidity 80% RH tape speed; 20 mm / sec load; 20 g wrapping angle; 90 °° <still time> H modified to allow still for a long time
Using i-8 VCR, temperature 40 ℃, relative humidity 8
The time until the RF output attenuated by 3 dB from the initial stage under the environment of 0% RH was obtained and defined as the still time. The measurement was performed three times for each sample, and the average value is also shown in Table 3 above.
【００８８】なお、３６０分以上経過してもＲＦ出力が
初期から３ｄＢ減衰しないサンプルについては３６０分
にて測定を打ち切り、表３中には３６０分以上として記
載した。For samples in which the RF output was not attenuated by 3 dB from the initial stage even after 360 minutes or more, the measurement was terminated at 360 minutes, and it was described in Table 3 as 360 minutes or more.
【００８９】以上の結果から、表３、表４に示すよう
に、Ｙ−Ｃ／Ｎが＋１．０ｄＢ以上のサンプルは電磁変
換特性が良好であり、摩擦係数が０．３以下のサンプル
は走行性が良好であり、スチル時間が２４０分以上のサ
ンプルは耐久性が良好であることが判った。From the above results, as shown in Tables 3 and 4, samples with Y-C / N of +1.0 dB or more have good electromagnetic conversion characteristics, and samples with friction coefficient of 0.3 or less are running. It was found that the sample having good durability and the still time of 240 minutes or more had good durability.
【００９０】また、本発明による実施例１〜１４のサン
プルテープは、比較例１〜６のに比べて、Ｙ−Ｃ／Ｎが
高く、摩擦係数が小さく、スチル時間が長くなった。こ
のことから、磁性塗料に含まれる強磁性粉末その他の無
機顔料と結合剤との比率を重量比で無機顔料／結合剤＝
５．７５〜６．７５とし、且つ磁性層の表面祖度Ｒａを
５．０ｎｍ以下、Ｒｚが７０ｎｍ以下とするとともに、
潤滑剤として含まれる高級脂肪酸エステルの量を強磁性
粉末１００重量部に対して１．５重量部以上３．０重量
部以下とすることは、電磁変換特性を向上させ走行性及
び耐久性を向上させるのに有効であることが判った。Further, the sample tapes of Examples 1 to 14 according to the present invention had higher Y-C / N, smaller friction coefficient and longer still time than those of Comparative Examples 1 to 6. From this fact, the ratio of the ferromagnetic powder and other inorganic pigments contained in the magnetic coating material to the binder is expressed as a weight ratio of inorganic pigment / binder =
5.75 to 6.75, the surface roughness Ra of the magnetic layer is 5.0 nm or less, and Rz is 70 nm or less, and
When the amount of the higher fatty acid ester contained as a lubricant is 1.5 parts by weight or more and 3.0 parts by weight or less with respect to 100 parts by weight of the ferromagnetic powder, the electromagnetic conversion characteristics are improved and the running property and durability are improved. It turned out to be effective in making it happen.
【００９１】ここで、更に詳細に検討するために、磁性
塗料に含まれる強磁性粉末その他の無機顔料と結合剤と
の比率について実施例１〜４及び比較例１，２で比較し
た。Here, in order to study in more detail, the ratios of the ferromagnetic powder and other inorganic pigments contained in the magnetic paint to the binder were compared in Examples 1 to 4 and Comparative Examples 1 and 2.
【００９２】磁性塗料に含まれる強磁性粉末その他の無
機顔料と結合剤との比率が本発明の範囲内にある実施例
１〜４のサンプルは、Ｙ−Ｃ／Ｎが＋１．０ｄＢ以上と
高く、摩擦係数が０．３ｄＢ以下と低く、スチル時間が
３６０分以上と長い。The samples of Examples 1 to 4 in which the ratio of the ferromagnetic powder or other inorganic pigment contained in the magnetic coating material to the binder was within the range of the present invention, the Y-C / N was as high as +1.0 dB or more. The friction coefficient is as low as 0.3 dB or less, and the still time is as long as 360 minutes or more.
【００９３】これに対して、磁性塗料に含まれる強磁性
粉末その他の無機顔料と結合剤との比率が本発明の範囲
内に満たない比較例１では、Ｙ−Ｃ／Ｎは高いものの、
スチル時間が非常に短く、摩擦係数も高い傾向にあっ
た。また、磁性塗料に含まれる強磁性粉末その他の無機
顔料と結合剤との比率が本発明の範囲を越える比較例２
では、摩擦係数は低いものの、Ｙ−Ｃ／Ｎが低く、スチ
ル時間も短かった。On the other hand, in Comparative Example 1 in which the ratio of the ferromagnetic powder and other inorganic pigments contained in the magnetic coating material to the binder was less than the range of the present invention, Y-C / N was high,
The still time was very short and the coefficient of friction tended to be high. Comparative Example 2 in which the ratio of the ferromagnetic powder or other inorganic pigment contained in the magnetic coating material to the binder exceeds the range of the present invention.
Then, although the friction coefficient was low, Y-C / N was low and the still time was short.
【００９４】このことから、磁性塗料に含まれる強磁性
粉末その他の無機顔料と結合剤との比率が本発明の範囲
内、つまり重量比で無機顔料／結合剤＝５．７５〜６．
７５に調整することで、電磁変換特性、走行性、耐久性
を高い水準で満足できることが判った。From this fact, the ratio of the ferromagnetic powder and other inorganic pigments contained in the magnetic paint to the binder is within the range of the present invention, that is, the weight ratio of inorganic pigment / binder = 5.75 to 6.
It was found that by adjusting the value to 75, the electromagnetic conversion characteristics, running property, and durability can be satisfied at a high level.
【００９５】また、磁性層の表面性について実施例１，
５，６及び比較例３，４で比較した。Regarding the surface property of the magnetic layer, Example 1,
5 and 6 and Comparative Examples 3 and 4 were compared.
【００９６】カレンダー処理時の処理条件を鏡面化の方
向に設定した実施例５のサンプルが磁性層の表面性が最
も良好であり、摩擦係数がやや高い傾向にあるものの、
最も高いＹ−Ｃ／Ｎを示した。これに対して、カレンダ
ー処理時の処理条件を鏡面化とは逆の方向に設定した比
較例３のサンプルは磁性層の表面性が本発明の範囲を越
え、Ｙ−Ｃ／Ｎが低く、良好な電磁変換特性を得ること
ができなかった。Although the sample of Example 5 in which the treatment condition during the calendar treatment was set in the mirror-finishing direction had the best surface property of the magnetic layer and the friction coefficient tended to be slightly high,
It showed the highest Y-C / N. On the other hand, in the sample of Comparative Example 3 in which the treatment condition during the calendar treatment was set in the direction opposite to that of mirror-finishing, the surface property of the magnetic layer exceeded the range of the present invention, and the Y-C / N ratio was low, which was good. It was not possible to obtain good electromagnetic conversion characteristics.
【００９７】一方、カーボンブラックを添加した実施例
６と比較例４のサンプルを比較した場合には、カーボン
ブラックの粒径が小さく添加量も少ない磁性層の表面性
が本発明の範囲内にある実施例６のサンプルでは、カー
ボンブラックを添加しない比較例１と比較してＹ−Ｃ／
Ｎが低いものの、電磁変換特性としては満足できる水準
にある。しかし、カーボンブラックの粒径が大きく添加
量も多く磁性層の表面性が本発明の範囲を越えた比較例
４のサンプルでは、Ｙ−Ｃ／Ｎが非常に低く、電磁変換
特性としては満足できる水準になかった。On the other hand, when the samples of Example 6 to which carbon black is added and the samples of Comparative Example 4 are compared, the surface property of the magnetic layer having a small particle size of carbon black and a small addition amount is within the range of the present invention. In the sample of Example 6, Y-C / compared with Comparative Example 1 in which carbon black was not added.
Although N is low, the electromagnetic conversion characteristics are at a satisfactory level. However, in the sample of Comparative Example 4 in which the particle size of carbon black was large and the addition amount was large and the surface property of the magnetic layer exceeded the range of the present invention, Y-C / N was very low and electromagnetic conversion characteristics were satisfactory. Not at the standard.
【００９８】従って、工程、原材料のいずれの条件によ
っても、磁性層の表面が本発明の範囲を越えた場合に
は、良好な電磁変換特性を得ることができないことが判
った。Therefore, it was found that good electromagnetic conversion characteristics could not be obtained when the surface of the magnetic layer exceeded the range of the present invention regardless of the process and raw material conditions.
【００９９】更に、潤滑剤として含まれる高級脂肪酸エ
ステルの量について、実施例１，７，８及び比較例５，
６で比較した。Further, regarding the amount of higher fatty acid ester contained as a lubricant, Examples 1, 7, 8 and Comparative Example 5,
6 were compared.
【０１００】潤滑剤として含まれる高級脂肪酸エステル
の量が本発明の下限である実施例７のサンプルは、それ
より量の多い実施例１，８のサンプルと比較してスチル
時間がやや短い傾向にあるものの、２４０分以上を示
し、耐久性として問題にならない水準が確保されている
ことが判った。The sample of Example 7 in which the amount of higher fatty acid ester contained as a lubricant is the lower limit of the present invention tends to have a slightly shorter still time than the samples of Examples 1 and 8 in which the amount is higher. However, it was shown to be 240 minutes or more, and it was found that the durability was maintained at a level that did not cause a problem.
【０１０１】また、潤滑剤として含まれる高級脂肪酸エ
ステルの量が本発明の上限である実施例８のサンプル
は、それより量の多い実施例１，７のサンプルと比較し
て摩擦係数がやや高い傾向にあるものの、０．３以下を
示し、走行性として問題にならない水準が確保されてい
ることが判った。Further, the sample of Example 8 in which the amount of the higher fatty acid ester contained as the lubricant was the upper limit of the present invention had a slightly higher friction coefficient than the samples of Examples 1 and 7 in which the amount was higher. Although there was a tendency, it was 0.3 or less, and it was found that a level that does not cause a problem in running performance was secured.
【０１０２】これに対して、潤滑剤として含まれる高級
脂肪酸エステルの量が本発明の範囲に満たない比較例５
のサンプルは、スチル時間が非常に短く、耐久性として
問題となる。潤滑剤として含まれる高級脂肪酸エステル
の量が本発明の範囲を超えた比較例６のサンプルは、摩
擦係数測定中に貼り付きを起こしてしまい、走行不可能
となった。On the other hand, Comparative Example 5 in which the amount of the higher fatty acid ester contained as the lubricant was less than the range of the present invention.
The sample No. 1 has a very short still time, which causes a problem in durability. The sample of Comparative Example 6 in which the amount of the higher fatty acid ester contained as the lubricant exceeded the range of the present invention caused sticking during the measurement of the friction coefficient, and thus was unable to run.
【０１０３】以上の結果から、潤滑剤として含まれる高
級脂肪酸エステルの量が本発明の範囲に調整することは
走行性と耐久性を両立させる上で効果があることが判っ
た。From the above results, it was found that adjusting the amount of the higher fatty acid ester contained as a lubricant within the range of the present invention is effective in achieving both running property and durability.
【０１０４】また、高級脂肪酸エステルの種類について
は、実施例１及び実施例９〜１４で同じ仕様で比較する
ことができる。いずれのサンプルも、Ｙ−Ｃ／Ｎが高
く、摩擦係数が低く、スチル時間も長く良好な電磁変換
特性、走行性及び耐久性が得られた。特に、潤滑剤とし
て使用する高級脂肪酸エステルが炭素数１６以上２２以
下の高級脂肪酸とネオペンチルアルコールとのエステル
化合物を用いた実施例１，９，１０のサンプルは、その
脂肪酸エステルを用いた実施例１１〜１４のサンプルと
比較して、摩擦係数も小さく、スチル時間も長いことか
ら、走行性及び耐久性がより優れていることが判った。The types of higher fatty acid ester can be compared in Example 1 and Examples 9 to 14 with the same specifications. All samples had high Y-C / N, low friction coefficient, long still time, and good electromagnetic conversion characteristics, runnability and durability. In particular, the samples of Examples 1, 9 and 10 in which the higher fatty acid ester used as the lubricant was an ester compound of a higher fatty acid having 16 or more and 22 or less carbon atoms and neopentyl alcohol are the examples using the fatty acid ester. Compared with the samples of Nos. 11 to 14, the friction coefficient was small and the still time was long, so it was found that the running property and durability were more excellent.
【０１０５】[0105]
【発明の効果】以上の説明から明らかなように、本発明
では、磁性塗料に含まれる強磁性粉末その他の無機顔料
と結合剤との比率を重量比で向き顔料／結合剤＝５．７
５〜６．７５とし、且つ磁性層の表面粗度Ｒａを５．０
ｎｍ以下、Ｒｚが７０ｎｍ以下とするとともに、潤滑剤
として含まれる高級脂肪酸エステルの量を強磁性粉末１
００重量部に対して１．５重量部以上３．０重量部以下
としているので、表面性が良好であるにも関わらず、潤
滑剤の存在状態が走行性及び耐久性双方にとって問題に
ならない範囲に制御されている。従って、本発明によれ
ば、電磁変換特性が高く、走行性及び耐久性に優れた磁
気記録媒体を得ることができる。As is clear from the above description, in the present invention, the ratio of the ferromagnetic powder and other inorganic pigments contained in the magnetic coating material to the binder is oriented in a weight ratio of pigment / binder = 5.7.
5 to 6.75, and the surface roughness Ra of the magnetic layer is 5.0.
nm or less and Rz of 70 nm or less, and the amount of higher fatty acid ester contained as a lubricant is set to 1
Since the amount is 1.5 parts by weight or more and 3.0 parts by weight or less with respect to 00 parts by weight, the surface state of the lubricant is good, but the presence state of the lubricant is not a problem for both running property and durability. Controlled by. Therefore, according to the present invention, it is possible to obtain a magnetic recording medium having high electromagnetic conversion characteristics and excellent running properties and durability.
Claims (4)
を主体とする磁性塗料の塗膜からなる磁性層が形成され
てなる磁気記録媒体において、 上記磁性塗料中に含まれる強磁性粉末その他の無機顔料
と結合剤との比率が重量比で無機顔料／結合剤＝５．７
５〜６．７５であり、且つ上記磁性層の表面粗度Ｒａが
５．０ｎｍ以下であるとともに、潤滑剤が上記強磁性粉
末１００重量部に対して１．５重量部以上３．０重量部
以下の割合で含まれていることを特徴とする磁気記録媒
体。1. A magnetic recording medium comprising a non-magnetic support and a magnetic layer formed of a coating film of a magnetic paint mainly composed of a ferromagnetic powder and a binder, the ferromagnetic material being contained in the magnetic paint. The weight ratio of the powder and other inorganic pigments to the binder is inorganic pigment / binder = 5.7.
5 to 6.75, the surface roughness Ra of the magnetic layer is 5.0 nm or less, and the lubricant is 1.5 parts by weight or more and 3.0 parts by weight with respect to 100 parts by weight of the ferromagnetic powder. A magnetic recording medium characterized by being contained in the following proportions.
下であることを特徴とする請求項１記載の磁気記録媒
体。2. The magnetic recording medium according to claim 1, wherein the surface roughness Rz of the magnetic layer is 70 nm or less.
用いられることを特徴とする請求項１又は２記載の磁気
記録媒体。3. The magnetic recording medium according to claim 1, wherein a higher fatty acid ester is used as the lubricant.
上２２以下の高級脂肪酸とネオペンチルアルコールとの
エステル化合物であることを特徴とする請求項３記載の
磁気記録媒体。4. The magnetic recording medium according to claim 3, wherein the higher fatty acid ester is an ester compound of a higher fatty acid having 16 to 22 carbon atoms and neopentyl alcohol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32318994A JP3564763B2 (en) | 1994-12-26 | 1994-12-26 | Magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32318994A JP3564763B2 (en) | 1994-12-26 | 1994-12-26 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08180365A true JPH08180365A (en) | 1996-07-12 |
| JP3564763B2 JP3564763B2 (en) | 2004-09-15 |
Family
ID=18152066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32318994A Expired - Lifetime JP3564763B2 (en) | 1994-12-26 | 1994-12-26 | Magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3564763B2 (en) |
-
1994
- 1994-12-26 JP JP32318994A patent/JP3564763B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3564763B2 (en) | 2004-09-15 |
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