JPH0489614A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPH0489614A
JPH0489614A JP19732490A JP19732490A JPH0489614A JP H0489614 A JPH0489614 A JP H0489614A JP 19732490 A JP19732490 A JP 19732490A JP 19732490 A JP19732490 A JP 19732490A JP H0489614 A JPH0489614 A JP H0489614A
Authority
JP
Japan
Prior art keywords
layer
magnetic
titanium dioxide
recording medium
ratio
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.)
Pending
Application number
JP19732490A
Other languages
Japanese (ja)
Inventor
Yasuhiro Kamiyama
康博 上山
Yuji Mido
勇治 御堂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP19732490A priority Critical patent/JPH0489614A/en
Publication of JPH0489614A publication Critical patent/JPH0489614A/en
Pending legal-status Critical Current

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Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To improve tape bending rigidity (stiffness) and to improve durability without deteriorating electromagnetic conversion characteristics by providing an intermediate layer consisting of acicular titanium dioxide layer having 30 to 120 major axis/minor axis ratio and a binder on a nonmagnetic base. CONSTITUTION:The intermediate layer consisting of the acicular titanium dioxide layer having 30 to 120 major axis/minor axis ratio and the binder is provided between the nonmagnetic base and a magnetic layer and/or the nonmagnetic base and back coat layer. The strength of the layer contg. the titanium dioxide layer having the high acicular ratio is extremely high in this way and, therefore, the degradation in the tape bending rigidity by the formation of the nonmagnetic base as a thinner film is made up and the magnetic recording medium having the improved durability is obtd. without deteriorating the electromagnetic conversion characteristics.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、オーディオテープ、ビデオテープ。[Detailed description of the invention] Industrial applications The present invention relates to audio tapes and video tapes.

磁気ディスク等に用いる磁気記録媒体に関する。The present invention relates to magnetic recording media used in magnetic disks and the like.

従来の技術 近年、特にビデオテープにおいて高密度記録技術が発達
し、高出力、高S/Hのために磁性粉の微粒子化と磁性
層の高平滑化が、また長時間記録対応のためにテープの
薄膜化がそれぞれ進んでいる。ところが磁気テープの薄
膜化に伴うテープ曲げ剛性(スティフネス)の低下によ
り、耐久性が低下するという問題が生していた。磁気テ
ープの薄膜化に伴い低下する耐久性の改善案としては、
非磁性支持体の強度を強くする方法が既に採られている
Conventional technology In recent years, high-density recording technology has developed, especially in video tapes. The thinning of each film is progressing. However, as magnetic tapes become thinner, tape bending rigidity (stiffness) decreases, resulting in a decrease in durability. As a proposal to improve the durability of magnetic tape, which decreases as the film becomes thinner,
A method of increasing the strength of a nonmagnetic support has already been adopted.

発明が解決しようとする課題 しかしながら、以上に述べたような方法だけでは、磁気
テープの薄膜化に伴い、非磁性支持体の曲げ剛性が低下
し、その結果磁気ヘットとのなしみ特性が低下すること
により電磁変換特性に悪影響を及ぼすことが避けられず
、いまだ満足すべき状態にあるとはいえない。
Problems to be Solved by the Invention However, with only the method described above, as the magnetic tape becomes thinner, the bending rigidity of the non-magnetic support decreases, resulting in a decrease in the staining characteristics with the magnetic head. As a result, it is unavoidable that the electromagnetic conversion characteristics are adversely affected, and it cannot be said that the state is still satisfactory.

本発明はこの課題に対し、電磁変換特性を劣化させるこ
となく耐久性の向−トした磁気記録媒体を提供すること
を目的とするものである。
SUMMARY OF THE INVENTION The present invention aims to solve this problem by providing a magnetic recording medium with improved durability without deteriorating electromagnetic conversion characteristics.

課題を解決するための手段 本発明は、非磁性支持体と磁性層の間および/または非
磁性支持体とパックコート層の間に、長軸/短軸の比が
30〜120である↑1状二酸化チタンと結合剤からな
る中間層を設りた磁気記録媒体である。
Means for Solving the Problems The present invention provides a method in which the ratio of major axis/minor axis is 30 to 120↑1 between the nonmagnetic support and the magnetic layer and/or between the nonmagnetic support and the pack coat layer. This is a magnetic recording medium with an intermediate layer made of titanium dioxide and a binder.

作用 本発明は上記した構成により、上記高針状比を有する二
酸化チタン含有層の強度が極めて高くなることから、非
磁性支持体の薄膜化によるテープ曲げ剛性の低下が補わ
れ、電磁変換特性を劣化させることなく、耐久性の向上
した磁気記録媒体の提供を可能上するものである。針状
二酸化チタンの長軸/短軸の比が30未満の場合、二酸
化チタン含有層の強度が低いことによりテープ曲げ剛性
を改善できない。また長軸/短軸の比が120を超える
場合、針状二酸化チタン含有層の表面粗さが悪化するこ
とにより磁性層表面の平滑性が失われるので、電磁変換
特性が劣化する。針状二酸化チタンの長軸/短軸の比が
30−120であると、テープ曲げ剛性を改善し、磁性
層表面の平滑性を悪化させることなく耐久性の向上した
磁気記録媒体が得られる。
Effect The present invention has the above-described structure, which makes the strength of the titanium dioxide-containing layer with the high acicular ratio extremely high, which compensates for the decrease in tape bending rigidity due to thinning of the non-magnetic support, and reduces the deterioration of electromagnetic conversion characteristics. This makes it possible to provide a magnetic recording medium with improved durability without causing damage. If the long axis/short axis ratio of the acicular titanium dioxide is less than 30, the tape bending rigidity cannot be improved due to the low strength of the titanium dioxide-containing layer. If the long axis/short axis ratio exceeds 120, the surface roughness of the acicular titanium dioxide-containing layer deteriorates and the surface smoothness of the magnetic layer is lost, resulting in deterioration of electromagnetic conversion characteristics. When the long axis/short axis ratio of the acicular titanium dioxide is 30-120, a magnetic recording medium with improved tape bending rigidity and improved durability without deteriorating the smoothness of the magnetic layer surface can be obtained.

実施例 本発明で用いる層状二酸化チタンは、ルチル形。Example The layered titanium dioxide used in the present invention is in the rutile form.

アナクーゼ形または表面処理の有無等、いずれであって
もよい。また中間層に用いる結合剤としては、親水基を
導入したポリウレタン樹脂、親水基を導入したニトロセ
ルロース系樹脂、親水基を導入したポリエステル樹脂、
親水基を導入した塩化ビニル系共重合樹脂等が使用でき
る。磁性層に用いる強磁性粉末は、メタル磁性粉、コバ
ルト被着磁性酸化鉄、バリウムフェライト磁性粉等があ
る。
It may be in an anacuse shape or with or without surface treatment. In addition, the binder used for the intermediate layer includes polyurethane resin with hydrophilic groups introduced, nitrocellulose resin with hydrophilic groups introduced, polyester resin with hydrophilic groups introduced,
Vinyl chloride copolymer resins into which hydrophilic groups have been introduced can be used. Examples of the ferromagnetic powder used in the magnetic layer include metal magnetic powder, cobalt-coated iron oxide powder, and barium ferrite magnetic powder.

磁性層に用いる結合剤としては、親水基を導入したポリ
ウレタン樹脂、親水基を導入したニトロセルロース系樹
脂、親水基を導入したポリエステル樹脂、親水基を導入
した塩化ヒニル系共重合樹脂が使用できる。研磨剤とし
て、アルミナ、二酸化クロム、酸化珪素、ヘンガラ等が
ある。帯電防止剤としては、導電性カーボンを使用する
ことができる。潤滑剤としては、高級脂肪酸や高級脂肪
酸エステル、または各種界面活性剤を単独もしくは複数
種を組み合わせて使用することができる。また、パック
コート層に用いる充填剤として、カーボンブラック、二
酸化クロム、ヘンガラ、アルミ−ノー グラファイト、
タルク、炭酸カルシウムなどの非磁性粉がある。非磁性
支持体としては、ポリエチレンテレフタレートフィルム
、ポリエチレンナフタレートフィルム、ポリアミド系樹
脂フィルム等がある。
As the binder used in the magnetic layer, polyurethane resins with hydrophilic groups introduced, nitrocellulose resins with hydrophilic groups introduced, polyester resins with hydrophilic groups introduced, and hinyl chloride copolymer resins with hydrophilic groups introduced can be used. Examples of abrasives include alumina, chromium dioxide, silicon oxide, and hengara. As the antistatic agent, conductive carbon can be used. As the lubricant, higher fatty acids, higher fatty acid esters, or various surfactants can be used alone or in combination. In addition, fillers used in the pack coat layer include carbon black, chromium dioxide, hengara, aluminum-no-graphite,
There are non-magnetic powders such as talc and calcium carbonate. Examples of the nonmagnetic support include polyethylene terephthalate film, polyethylene naphthalate film, and polyamide resin film.

以下に本発明の具体的な実施例について説明する。Specific examples of the present invention will be described below.

〔実施例1〕 中間層の作成 針状二酸化チタン(長軸/短軸比−40,長袖−5μm
)          100部ポリウレタン樹脂  
       20部メチルエチルケトン      
 150部トルエン            150部
上記組成をサンドミルで分散した塗料に、ポリイソシア
ネート         10部を添加し、7μm厚の
ポリエチレンテレフタレート支持体上に塗布、乾燥して
2μm厚の中間層を作成した。
[Example 1] Creation of intermediate layer Acicular titanium dioxide (major axis/minor axis ratio -40, long sleeve -5 μm
) 100 parts polyurethane resin
20 parts methyl ethyl ketone
150 parts Toluene 150 parts 10 parts of polyisocyanate was added to a coating material prepared by dispersing the above composition using a sand mill, and the mixture was coated on a 7 μm thick polyethylene terephthalate support and dried to form a 2 μm thick intermediate layer.

磁性層の作成 磁性粉             100部アルミナ 
            5部導電性カーホン    
       1部塩化ビニル樹脂         
 10部ポリウレタン樹脂         10部メ
チルエチルケトン       150部トルエン  
         150部上記組成をサントミルで分
散した磁性塗料に、ミリスチン酸          
  1部n−ブチルステアレート        1部
ポリイソシアネート          5部を添加し
、デイスパーで攬はんし、前記中間層上に塗布、配向、
乾燥し、カレンダー処理による鏡面加工を施して2μm
厚の磁性層を得た。
Creating the magnetic layer Magnetic powder 100 parts Alumina
5 parts conductive car phone
1 part vinyl chloride resin
10 parts polyurethane resin 10 parts methyl ethyl ketone 150 parts toluene
Add 150 parts of myristic acid to a magnetic paint containing the above composition dispersed with Santomil.
1 part n-butyl stearate 1 part polyisocyanate 5 parts were added, dispersed with a disper, coated on the intermediate layer, oriented,
Dried and mirror-finished by calendering to 2 μm.
A thick magnetic layer was obtained.

バンクコート層の作成 カーボンブランク アルミナ ニドじ1セルロース樹脂 ポリウレタン樹脂 ノヂルエチルケトン トルエン 100部 7部 20部 20部 200部 200部 上記組成をサントミルで分散したパックコート塗料に、 ミリスチン酸            1部ポリイソシ
アネート         10部を添加し、デイスパ
ーで攪はんし、前記磁性層とは反対側の前記支持体上に
塗布し、1μm厚のパックコート層を作成した。
Preparation of Bank Coat Layer Carbon Blank Aluminide 1 Cellulose Resin Polyurethane Resin Nodyl Ethyl Ketone Toluene 100 parts 7 parts 20 parts 20 parts 200 parts 200 parts The above composition was dispersed in a pack coat paint using Santomil, and myristic acid 1 part Polyisocyanate 10 parts of the solution was added, stirred with a disperser, and coated on the support on the opposite side from the magnetic layer to form a pack coat layer with a thickness of 1 μm.

〔実施例2〕 実施例1の針状二酸化チタンを、長軸/短軸の比を70
(長軸−5μm)にした他はすべて実施例1と同しにし
て2μm厚の中間層を作成し、次に実施例1と同様に磁
性層、バンクコート層を作成した。
[Example 2] The acicular titanium dioxide of Example 1 was prepared with a long axis/short axis ratio of 70.
An intermediate layer having a thickness of 2 .mu.m was prepared in the same manner as in Example 1 except that the length was changed to (long axis -5 .mu.m), and then a magnetic layer and a bank coat layer were formed in the same manner as in Example 1.

〔実施例3] 実施例1の剣状二酸化チタンを、長軸/短軸の比を10
0(長軸−5μm)にした他はすべて実施例1と同しに
して211m厚の中間層を作成し、次に実施例1と同様
に磁性層、バンクコート層を作成した。
[Example 3] The sword-shaped titanium dioxide of Example 1 was prepared with a long axis/short axis ratio of 10.
An intermediate layer having a thickness of 211 m was prepared in the same manner as in Example 1 except that the thickness was changed to 0 (major axis -5 .mu.m), and then a magnetic layer and a bank coat layer were formed in the same manner as in Example 1.

〔比較例1] 実施例1の針状二酸化チタンを平均粒径0.4μmの球
状二酸化チタンに変えた他はすべて実施例1と同じにし
て2μm厚の中間層を作成し、次に実施例1と同様に磁
性層、バンクコート層を作成した。
[Comparative Example 1] A 2 μm thick intermediate layer was prepared in the same manner as in Example 1, except that the acicular titanium dioxide in Example 1 was changed to spherical titanium dioxide with an average particle size of 0.4 μm, and then Example 1 was prepared. A magnetic layer and a bank coat layer were prepared in the same manner as in Example 1.

(比較例2〕 実施例1の針状二酸化チタンの長軸/短軸の比を20(
長軸−5μm)に変えた他はすべて実施例Iと同じにし
て2μm厚の中間層を作成し、次に実施例1と同様に磁
性層、ハノクコ−1・層を作成した。
(Comparative Example 2) The ratio of the long axis/short axis of the acicular titanium dioxide of Example 1 was set to 20 (
An intermediate layer having a thickness of 2 .mu.m was prepared in the same manner as in Example I except that the long axis was changed to -5 .mu.m), and then a magnetic layer, a Hanokuko-1 layer, was formed in the same manner as in Example 1.

〔比較例3〕 実施例1の針状二酸化チタンの長軸/短軸の比を150
(長軸−5μm)に変えた他はすべて実施例1と同しに
して2μm厚の中間層を作成し、次に実施例1と同様に
磁性層、ハックコート層を作成した。
[Comparative Example 3] The long axis/short axis ratio of the acicular titanium dioxide of Example 1 was 150.
An intermediate layer having a thickness of 2 .mu.m was prepared in the same manner as in Example 1 except that the length was changed to (long axis - 5 .mu.m), and then a magnetic layer and a hack coat layer were formed in the same manner as in Example 1.

実施例1〜3、比較例1〜3で得られた各サンプル 得た。得られた各サンプルにおいて、スティフ不スメー
タを用いたテープスティフネス、触針式表面粗さ計を用
いた磁性層表面粗さ、VTRデツキにおいて再生/巻戻
し100パス耐久走行後のテープの目視状態、S/VH
Sデツキを用いた電磁変換特性をそれぞれ測定した。そ
れらの結果を次の特性表に示す。
Each sample obtained in Examples 1 to 3 and Comparative Examples 1 to 3 was obtained. For each sample obtained, the tape stiffness using a stiffness meter, the surface roughness of the magnetic layer using a stylus surface roughness meter, the visual condition of the tape after 100 passes of playback/rewind on a VTR deck, S/VH
The electromagnetic conversion characteristics of each were measured using an S deck. The results are shown in the following characteristic table.

(以 下 余 白) 発明の効果 以上のように本発明によれば、非磁性支持体上に長軸/
短軸の比が30〜120の針状二酸化チタンと結合剤か
らなる中間層を設けていることからテープ曲げ剛性(ス
ティフネス)を改善することができ、電磁変換特性を劣
化させることなく耐久性の向上した磁気記録媒体を得る
ことができる。
(Margin below) Effects of the Invention As described above, according to the present invention, the long axis/
By providing an intermediate layer consisting of acicular titanium dioxide with a short axis ratio of 30 to 120 and a binder, tape bending stiffness can be improved, and durability can be improved without deteriorating electromagnetic characteristics. An improved magnetic recording medium can be obtained.

代理人の氏名 弁理士 栗野重孝 はか1名■Name of agent: Patent attorney Shigetaka Kurino (1 person)

Claims (1)

【特許請求の範囲】[Claims] 非磁性支持体と磁性層の間もしくは非磁性支持体とパッ
クコート層の間または前記両方の間に、長軸/短軸の比
が30〜120である針状二酸化チタンと結合剤からな
る中間層を設けたことを特徴とする磁気記録媒体。
Between the non-magnetic support and the magnetic layer, or between the non-magnetic support and the pack coat layer, or both, an intermediate comprising acicular titanium dioxide having a major axis/minor axis ratio of 30 to 120 and a binder. A magnetic recording medium characterized by having a layer.
JP19732490A 1990-07-25 1990-07-25 Magnetic recording medium Pending JPH0489614A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19732490A JPH0489614A (en) 1990-07-25 1990-07-25 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19732490A JPH0489614A (en) 1990-07-25 1990-07-25 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPH0489614A true JPH0489614A (en) 1992-03-23

Family

ID=16372567

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19732490A Pending JPH0489614A (en) 1990-07-25 1990-07-25 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPH0489614A (en)

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