JPH0248971B2 - - Google Patents
Info
- Publication number
- JPH0248971B2 JPH0248971B2 JP56095518A JP9551881A JPH0248971B2 JP H0248971 B2 JPH0248971 B2 JP H0248971B2 JP 56095518 A JP56095518 A JP 56095518A JP 9551881 A JP9551881 A JP 9551881A JP H0248971 B2 JPH0248971 B2 JP H0248971B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- powder
- magnetic powder
- titanium coupling
- vinyl chloride
- 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 - Lifetime
Links
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 15
- 239000010936 titanium Substances 0.000 claims description 11
- 239000007822 coupling agent Substances 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 10
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- 239000006247 magnetic powder Substances 0.000 description 21
- 239000000843 powder Substances 0.000 description 12
- 239000003973 paint Substances 0.000 description 8
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- UMHKOAYRTRADAT-UHFFFAOYSA-N [hydroxy(octoxy)phosphoryl] octyl hydrogen phosphate Chemical compound CCCCCCCCOP(O)(=O)OP(O)(=O)OCCCCCCCC UMHKOAYRTRADAT-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- -1 alkyl titanate Chemical compound 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- SPBDXSGPUHCETR-JFUDTMANSA-N 8883yp2r6d Chemical compound O1[C@@H](C)[C@H](O)[C@@H](OC)C[C@@H]1O[C@@H]1[C@@H](OC)C[C@H](O[C@@H]2C(=C/C[C@@H]3C[C@@H](C[C@@]4(O[C@@H]([C@@H](C)CC4)C(C)C)O3)OC(=O)[C@@H]3C=C(C)[C@@H](O)[C@H]4OC\C([C@@]34O)=C/C=C/[C@@H]2C)/C)O[C@H]1C.C1C[C@H](C)[C@@H]([C@@H](C)CC)O[C@@]21O[C@H](C\C=C(C)\[C@@H](O[C@@H]1O[C@@H](C)[C@H](O[C@@H]3O[C@@H](C)[C@H](O)[C@@H](OC)C3)[C@@H](OC)C1)[C@@H](C)\C=C\C=C/1[C@]3([C@H](C(=O)O4)C=C(C)[C@@H](O)[C@H]3OC\1)O)C[C@H]4C2 SPBDXSGPUHCETR-JFUDTMANSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000005456 alcohol based solvent Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/708—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by addition of non-magnetic particles to the layer
Description
この発明は磁気記録媒体に関し、その目的とす
るところは磁性物末の分散性が良好で磁気特性お
よび磁性層の表面平滑性に優れた磁気記録媒体を
提供することにある。
磁気記録媒体は、通常、磁性粉末、結合剤成
分、有機溶剤およびその他の必要成分からなる磁
性塗料をポリエステルフイルムなどの基体上に塗
布、乾燥してつくられ、磁気特性および表面平滑
性に優れるとともに耐久性に優れたものが要求さ
れる。そのため磁性粉末を分散剤等で処理するな
どの方法で磁性粉末の分散性を改善することによ
つて磁気特性および表面平滑性を向上し、また耐
摩耗性を改善する試みがなされており、たとえば
アルキルチタネートで磁性粉末を処理したものが
提案されているが、磁性粉末の分散性はいまひと
つ充分ではなく、磁気特性および表面平滑性の向
上も末だ充分に満足できるものではない。
この発明者らはかかる現状に鑑み種々検討を行
なつた。結果、一般式
（但し、式中Ｒは炭化水素基または−CH2−CO
−、Ｘは−Ｏ−PO（OH）−Ｏ−PO、Ｙは−（Ｏ−
R1）2であつてR1はアルキル基である。）
で示されるチタンカツプリング剤と塩化ビニル系
樹脂とを磁性層中に含有させると磁性粉末の分散
性が充分に改善され、磁気特性および磁性層の表
面平滑性が一段と向上することを見いだし、この
発明をなすに至つた。
この発明で使用される前記一般式のチタンカツ
プリング剤は、磁性粉末と接すると粉末表面の水
酸基と強力に反応し、チタン原子と
−Ｏ
−Ｏ＞Ｒとの結合が切れてチタン原子
が磁性粉末の表面に酸素を介して強固に結合す
る。従つてこの種のチタンカツプリング剤が磁性
層中に含有されると磁性粉末の粒子表面に強固に
被着し、被膜を形成して磁性粉末の分散性を充分
に改善し磁気特性および表面平滑性を一段と向上
する。このようなチタンカツプリング剤の具体例
としては、たとえば下記の構造式で表わされるケ
ンリツヒペトロケミカル社製プレンアクト138S、
プレンアクト238S等が挙げられる。
プレンアクト138S〔ビス（ジオクチルパイロホ
スフエート）オキシアセテートチタネート〕
プレンアクト238S〔ビス（ジオクチルパイロホ
スフエート）エチレンチタネート〕
これらのチタンカツプリング剤を磁性層中に含
有させるには、これらを適当な溶剤中に溶解さ
せ、この溶解によつて得られた溶液を磁性塗料の
調製時に添加するか、あるいはこの溶液中に磁性
粉末を浸漬して予め磁性粉末の表面処理を行な
い、この磁性粉末を使用して磁性塗料を調製する
などの方法によつて行なわれる。使用量は磁性層
中の磁性粉末に対して0.1重量％より少ないと所
期の効果が得られず、10重量％を越えるとブリー
ドアウトするおそれがあるため0.1〜10重量％の
範囲内であることが好ましく、0.5〜５重量％の
範囲内で使用するのがより好ましい。
また、この発明において結合剤成分として使用
される塩化ビニル系樹脂は、それ単独でもある程
度磁性粉末の分散性に優れているが、前記のチタ
ンカツプリング剤とともに磁性層中に含有される
と磁性粉末との親和性が向上して磁性粉末の分散
性がさらに改善され、磁性特性および表面平滑性
が一段と向上する。更に磁性塗膜中で塩化ビニル
樹脂はチタンカツプリング剤、磁性粉を介して架
橋した形となり塗膜の耐熱性も向上する。このよ
うな塩化ビニル系樹脂としては、塩化ビニル−酢
酸ビニル共重合体、塩化ビニル−酢酸ビニル−ビ
ニルアルコール共重合体、塩化ビニル−酢酸ビニ
ル−マレイン酸共重合体、塩化ビニル−プロピオ
ン酸共重合体などが好適なものとして使用され、
具体例としては、たとえば米国U.C.C社製
VYHH、VAGH、VMCH、積水化学工業社製
エスレツクＡ、東洋曹達社製リユーロンQS−
430、リユーロンQA−431などが挙げられる。
この発明に使用する磁性粉末としては、たとえ
ば、γ−Fe2O3粉末、Fe3O4粉末、Co含有γ−
Fe2O3粉末、CO含有Fe3O4粉末、CrO2粉末の他、
Fe粉末、Co粉末、Fe−Ni粉末などの金属粉末な
ど従来公知の各種磁性粉末が広く包含される。ま
た金属粉末は表面に薄い酸化膜層を形成させて用
いると、チタンカツプリング剤を併用した効果が
大きくなる。
有機溶剤としては、シクロヘキサノン、メチル
エチルケトン、メチルイソブチルケトンなどのケ
トン系溶剤、酢酸エチル、酢酸ブチルなどのエス
テル系溶剤、ベンゼン、トルエン、キシレンなど
の芳香族炭化水素系溶剤、イソプロピルアルコー
ルなどのアルコール系溶剤、ジメチルホルムアミ
ドなどの酸アミド系溶剤、ジメチルスルホキシド
などのスルホキシド系溶剤、テトラヒドロフラ
ン、ジオキサンなどのエーテル系溶剤など、使用
するチタンカツプリング剤および結合剤成分を溶
解するのに適した溶剤が特に制限されることなく
単独または二種以上混合して使用される。
なお、磁性塗料中には必要に応じて一般に使用
されている他の結合剤成分を併用してもよく、ま
た通常使用されている各種添加剤、たとえば分散
剤、潤滑剤、研磨剤、帯電防止剤などを適宜に添
加使用してもよい。
次に、この発明の実施例について説明する。
実施例
α−Fe磁性粉末 80重量部
VAGH（米国U.C.C社製、塩化ビニル−酢酸ビニ
ル−ビニルアルコール共重合体） ８ 〃
パンデツクスＴ−5250（大日本インキ社製、ポリ
ウレタンエラストマー） ８ 〃
コロネートＬ（日本ポリウレタン工業社製、三官
能性低分子量イソシアネート化合物） ４ 〃
プレンアクト138S〔ケンリツヒペトロケミカル社
製、ビス（ジオクチルパイロホスフエート）オキ
シアセテートチタネート〕 1.6 〃
カーボンブラツク ４ 〃
シクロヘキサン 80 〃
トルエン 80 〃
この組成物をボールミルで約72時間混合分散し
て磁性塗料を調製した。この磁性塗料を厚さ11μ
のポリエステルフイルム上に乾燥厚が約4μとな
るように塗布、乾燥し、表面処理を行なつた後所
定の巾に裁断して磁気テープをつくつた。
比較例 １
実施例における磁性塗料の組成において、プレ
ンアクト138Sを省いた以外は実施例と同様にし
て磁気テープをつくつた。
比較例 ２
実施例における磁性塗料の組成において、プレ
ンアクト138Sに代えてテトライソプロピルチタ
ネート〔Ti（OC3H7）4〕を同量使用した以外は実
施例と同様にして磁気テープをつくつた。
実施例および各比較例で得られた磁気テープを
ビデオデツキ（日立製作所社製VT−5000）に装
填して記録再生を行ない、シバソク社製カラービ
デオノイズメーター925CでビデオSN比およびカ
ラーSN比を測定した。測定値は比較例１で得ら
れた磁気テープのビデオSN比およびカラーSN比
を０としてそれとの差で表わした。
下表はその結果である。
The present invention relates to a magnetic recording medium, and an object of the present invention is to provide a magnetic recording medium with good dispersibility of magnetic powder and excellent magnetic properties and surface smoothness of the magnetic layer. Magnetic recording media are usually made by applying and drying a magnetic paint consisting of magnetic powder, a binder component, an organic solvent, and other necessary components onto a substrate such as a polyester film, and have excellent magnetic properties and surface smoothness. Something with excellent durability is required. Therefore, attempts have been made to improve the dispersibility of magnetic powder by treating the magnetic powder with a dispersant, etc. to improve the magnetic properties and surface smoothness, and also to improve the wear resistance. Although magnetic powder treated with alkyl titanate has been proposed, the dispersibility of the magnetic powder is still insufficient, and improvements in magnetic properties and surface smoothness are still not fully satisfactory. The inventors conducted various studies in view of the current situation. Result, general formula (However, in the formula, R is a hydrocarbon group or -CH 2 -CO
-, X is -O-PO(OH)-O-PO, Y is -(O-
R 1 ) 2 , where R 1 is an alkyl group. It has been discovered that when a titanium coupling agent shown in This invention has been made. When the titanium coupling agent having the general formula used in this invention comes into contact with magnetic powder, it strongly reacts with the hydroxyl groups on the powder surface, breaking the bond between titanium atoms and -O -O>R, and making titanium atoms magnetic. It is strongly bonded to the powder surface via oxygen. Therefore, when this type of titanium coupling agent is contained in the magnetic layer, it firmly adheres to the surface of the magnetic powder particles, forming a film that sufficiently improves the dispersibility of the magnetic powder and improves the magnetic properties and surface smoothness. further improve your sexuality. Specific examples of such titanium coupling agents include Prenact 138S, manufactured by Kenritzhi Petrochemical Co., Ltd., which is represented by the following structural formula,
Examples include Plain Act 238S. Preneact 138S [Bis(dioctylpyrophosphate) oxyacetate titanate] Prenact 238S [Bis(dioctylpyrophosphate) ethylene titanate] In order to incorporate these titanium coupling agents into the magnetic layer, they are dissolved in a suitable solvent, and the solution obtained by this dissolution is used as a magnetic layer. This can be carried out by adding it when preparing the paint, or by immersing the magnetic powder in this solution to previously perform a surface treatment on the magnetic powder, and then using this magnetic powder to prepare a magnetic paint. The amount used should be within the range of 0.1 to 10% by weight, as if it is less than 0.1% by weight of the magnetic powder in the magnetic layer, the desired effect will not be obtained, and if it exceeds 10% by weight, it may bleed out. It is more preferable to use it in a range of 0.5 to 5% by weight. In addition, the vinyl chloride resin used as a binder component in this invention has excellent dispersibility of magnetic powder to some extent even when it is alone, but when it is included in the magnetic layer together with the titanium coupling agent described above, the magnetic powder becomes The dispersibility of the magnetic powder is further improved, and the magnetic properties and surface smoothness are further improved. Furthermore, in the magnetic coating film, the vinyl chloride resin is crosslinked via the titanium coupling agent and magnetic powder, which improves the heat resistance of the coating film. Such vinyl chloride resins include vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, and vinyl chloride-propionic acid copolymer. Combination etc. are used as suitable ones,
As a specific example, for example, manufactured by UCC Company in the United States.
VYHH, VAGH, VMCH, Sekisui Chemical Co., Ltd.'s Esretsu A, Toyo Soda Co., Ltd.'s Reeuron QS-
430, Lieuron QA-431, etc. Examples of the magnetic powder used in this invention include γ-Fe 2 O 3 powder, Fe 3 O 4 powder, and Co-containing γ-
In addition to Fe 2 O 3 powder, CO-containing Fe 3 O 4 powder, CrO 2 powder,
Various conventionally known magnetic powders such as metal powders such as Fe powder, Co powder, and Fe-Ni powder are widely included. Furthermore, if the metal powder is used with a thin oxide film layer formed on its surface, the effect of using the titanium coupling agent in combination will be enhanced. Examples of organic solvents include ketone solvents such as cyclohexanone, methyl ethyl ketone, and methyl isobutyl ketone, ester solvents such as ethyl acetate and butyl acetate, aromatic hydrocarbon solvents such as benzene, toluene, and xylene, and alcohol solvents such as isopropyl alcohol. Solvents suitable for dissolving the titanium coupling agent and binder components used are particularly limited, such as acid amide solvents such as dimethylformamide, sulfoxide solvents such as dimethyl sulfoxide, and ether solvents such as tetrahydrofuran and dioxane. They can be used alone or in combination of two or more. In addition, other commonly used binder components may be used in the magnetic paint as necessary, and various commonly used additives such as dispersants, lubricants, abrasives, antistatic agents, etc. Agents and the like may be added and used as appropriate. Next, embodiments of the invention will be described. Example α-Fe magnetic powder 80 parts by weight VAGH (manufactured by UCC, USA, vinyl chloride-vinyl acetate-vinyl alcohol copolymer) 8 Pandex T-5250 (manufactured by Dainippon Ink, polyurethane elastomer) 8 Coronate L (manufactured by Dainippon Ink Co., Ltd., polyurethane elastomer) (manufactured by Nippon Polyurethane Kogyo Co., Ltd., trifunctional low molecular weight isocyanate compound) 4 [Plenact 138S [manufactured by Kenrich Petrochemical Co., Ltd., bis (dioctyl pyrophosphate) oxyacetate titanate]] 1.6 [Carbon black] 4 [Cyclohexane 80] [Toluene 80] This The composition was mixed and dispersed in a ball mill for about 72 hours to prepare a magnetic paint. Apply this magnetic paint to a thickness of 11μ
The magnetic tape was coated on a polyester film to a dry thickness of about 4 μm, dried, and after surface treatment, cut to a predetermined width to make a magnetic tape. Comparative Example 1 A magnetic tape was made in the same manner as in the example except that Preact 138S was omitted from the composition of the magnetic paint in the example. Comparative Example 2 A magnetic tape was prepared in the same manner as in the example except that the same amount of tetraisopropyl titanate [Ti(OC 3 H 7 ) 4 ] was used in place of Preneact 138S in the composition of the magnetic paint in the example. The magnetic tapes obtained in the Examples and Comparative Examples were loaded into a video deck (VT-5000 manufactured by Hitachi, Ltd.) for recording and playback, and the video SN ratio and color SN ratio were measured using a color video noise meter 925C manufactured by Shibasoku Corporation. did. The measured values were expressed as the difference from the video SN ratio and color SN ratio of the magnetic tape obtained in Comparative Example 1, which were assumed to be 0. The table below shows the results.
【表】
上表から明らかなように、この発明で得られた
磁気テープ（実施例）は従来の磁気テープ（比較
例１および２）に比しビデオSN比およびカラー
SN比がいずれも高く、このことからこの発明に
よつて得られる磁気記録媒体は磁性粉末の分散性
に優れ、磁性層表面の平滑性および光沢が良好で
磁気特性が一段と向上されていることがわかる。[Table] As is clear from the above table, the magnetic tape obtained by the present invention (Example) has a higher video S/N ratio and color than conventional magnetic tapes (Comparative Examples 1 and 2).
All of the signal-to-noise ratios are high, which indicates that the magnetic recording medium obtained by the present invention has excellent dispersibility of magnetic powder, good smoothness and gloss on the surface of the magnetic layer, and further improved magnetic properties. Recognize.
Claims (1)
−、Ｘは−Ｏ−PO（OH）−Ｏ−PO、Ｙは−（Ｏ−
R1）2であつてR1はアルキル基である。） で示されるチタンカツプリング剤と塩化ビニル系
樹脂とが含まれてなる磁性層を有する磁気記録媒
体。[Claims] 1. General formula (However, in the formula, R is a hydrocarbon group or -CH 2 -CO
-, X is -O-PO(OH)-O-PO, Y is -(O-
R 1 ) 2 , where R 1 is an alkyl group. ) A magnetic recording medium having a magnetic layer containing a titanium coupling agent and a vinyl chloride resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9551881A JPS57210439A (en) | 1981-06-20 | 1981-06-20 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9551881A JPS57210439A (en) | 1981-06-20 | 1981-06-20 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57210439A JPS57210439A (en) | 1982-12-24 |
| JPH0248971B2 true JPH0248971B2 (en) | 1990-10-26 |
Family
ID=14139781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9551881A Granted JPS57210439A (en) | 1981-06-20 | 1981-06-20 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57210439A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5658135A (en) * | 1979-10-13 | 1981-05-21 | Sony Corp | Magnetic recording medium |
| JPS57111829A (en) * | 1980-12-27 | 1982-07-12 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
-
1981
- 1981-06-20 JP JP9551881A patent/JPS57210439A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5658135A (en) * | 1979-10-13 | 1981-05-21 | Sony Corp | Magnetic recording medium |
| JPS57111829A (en) * | 1980-12-27 | 1982-07-12 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57210439A (en) | 1982-12-24 |
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