JPH0248968B2 - - Google Patents
Info
- Publication number
- JPH0248968B2 JPH0248968B2 JP56095513A JP9551381A JPH0248968B2 JP H0248968 B2 JPH0248968 B2 JP H0248968B2 JP 56095513 A JP56095513 A JP 56095513A JP 9551381 A JP9551381 A JP 9551381A JP H0248968 B2 JPH0248968 B2 JP H0248968B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- powder
- magnetic powder
- titanium coupling
- solvents
- 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 16
- 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
- 239000012461 cellulose resin Substances 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- 239000006247 magnetic powder Substances 0.000 description 23
- 239000000843 powder Substances 0.000 description 11
- 239000003973 paint Substances 0.000 description 8
- 239000000020 Nitrocellulose Substances 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 229920001220 nitrocellulos Polymers 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
- 239000000203 mixture Substances 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
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 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
- XMQYIPNJVLNWOE-UHFFFAOYSA-N dioctyl hydrogen phosphite Chemical compound CCCCCCCCOP(O)OCCCCCCCC XMQYIPNJVLNWOE-UHFFFAOYSA-N 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000001035 drying Methods 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
- 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
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- SRORDPCXIPXEAX-UHFFFAOYSA-N CCCCCCCCCCCCCP(CCCCCCCCCCCCC)(O)(OCCCCCCCC)OCCCCCCCC.CCCCCCCCCCCCCP(CCCCCCCCCCCCC)(O)(OCCCCCCCC)OCCCCCCCC Chemical compound CCCCCCCCCCCCCP(CCCCCCCCCCCCC)(O)(OCCCCCCCC)OCCCCCCCC.CCCCCCCCCCCCCP(CCCCCCCCCCCCC)(O)(OCCCCCCCC)OCCCCCCCC SRORDPCXIPXEAX-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 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
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- SMEGJBVQLJJKKX-HOTMZDKISA-N [(2R,3S,4S,5R,6R)-5-acetyloxy-3,4,6-trihydroxyoxan-2-yl]methyl acetate Chemical compound CC(=O)OC[C@@H]1[C@H]([C@@H]([C@H]([C@@H](O1)O)OC(=O)C)O)O SMEGJBVQLJJKKX-HOTMZDKISA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229940081735 acetylcellulose Drugs 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
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 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
- -1 isocyanate compound Chemical class 0.000 description 1
- 239000005453 ketone based solvent Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose 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
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 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
- G11B5/7013—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 the dispersing agent
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
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
上も未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
（RO）4−Ti−（Ｘ−Ｙ）2
（但し、式中Ｒは炭化水素基または−CH2−Ｃ
（C2H5）−（CH2−Ｏ−CH2−CH＝CH2）2、Ｘは
Ｐ、Ｙは−（Ｏ−R1）2OH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繊維素系樹脂
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−（OR）4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磁
性層の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41B、プレンアクト
46B、ブレンアクト55等が挙げられる。
プレンアクト41B〔テトライソプロピルビス
（ジオクチルホスフアイト）チタネート〕
（C8H17−Ｏ−）4Ti−〔Ｐ−（Ｏ−C13H27）2OH〕2
プレンアクト46B〔テトラオクチルビス（ジト
リデシルホスフアイト）チタネート〕
プレンアクト55〔テトラ（２，２−ジアリルオ
キシメチル−１−ブチル）ビス（ジ−トリデシ
ル）ホスフアイトチタネート）
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％を越えるとプリー
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
される繊維素系樹脂は、それ単独でもある程度磁
性粉末の分散性は優れているが、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散
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。更に磁性塗膜中で繊維素系樹脂
はチタンカツプリング剤、磁性粉を介して橋かけ
した形となり、可撓性が増し耐摩耗性も向上す
る。このような繊維素系樹脂としては、たとえば
ニトロセルロース、アセチルセルロース、アセチ
ルブチルセルロース、メチルセルロース、エチル
セルロース、ベンジルセルロース、カルボキシメ
チルセルロース、ヒドロキシセルロースなどが好
適なものとして挙げられ、ニトロセルロースの具
体例としては、たとえば旭化成社製ニトロセルロ
ースL1／２、L1／４、L1、H1／４、H1／２、
H1、H5、ダイセル社製ニトロセルロースRS1／
16、RS1／２、RS1、RS2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
ニトロセルロースH1／２（旭化成社製、ニトロセ
ルロース） ８ 〃
クリスボン7209（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46B〔ケンリツヒペトロケミカル社
製、テトラオクチルビス（ジトリデシルホスフア
イト）チタネート〕 1.6 〃
カーボンブラツク ４ 〃
シクロヘキサノン 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、
所定の幅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46B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46B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 powders treated with alkyl titanates have been proposed, the dispersibility of the magnetic powders is still not sufficient, and improvements in magnetic properties and surface smoothness are still not fully satisfactory. The inventors conducted various studies in view of the current situation and found that the general formula (RO) 4 -Ti-(X-Y) 2 (wherein R is a hydrocarbon group or -CH 2 -C
( C2H5 )-( CH2 -O- CH2 -CH= CH2 ) 2 , X is P, Y is -(O- R1 ) 2OH , and R1 is an alkyl group. It has been discovered that when a titanium coupling agent shown in ) and a cellulose resin are contained in the magnetic layer, the dispersibility of the magnetic powder is sufficiently improved, and the magnetic properties and surface smoothness of the magnetic layer are further improved. This invention has been made. When the titanium coupling agent of the general formula used in this invention comes into contact with magnetic powder, it strongly reacts with the hydroxyl group on the powder surface, breaking the bond between titanium atoms and -(OR) 4 , and causing titanium atoms to form in the magnetic powder. It is strongly bonded to the surface of the substance via oxygen. Therefore, when this type of titanium coupling agent is contained in the magnetic layer, it adheres firmly to the particle surface of the magnetic powder, forms a film, sufficiently improves the dispersibility of the magnetic powder, and improves the magnetic properties and magnetic layer. further improves surface smoothness. Specific examples of such titanium coupling agents include Prene Act 41B and Prene Act manufactured by Kenritzhi Petrochemical Co., Ltd., which are represented by the following structural formulas.
46B, Brenact 55, etc. PreneAct 41B [Tetraisopropylbis(dioctylphosphite) titanate] (C 8 H 17 -O-) 4 Ti- [P-(O-C 13 H 27 ) 2 OH] 2 PreneAct 46B [Tetraoctylbis(dioctylphosphite) titanate] Preneact 55 [Tetra(2,2-diallyloxymethyl-1-butyl)bis(di-tridecyl)phosphite titanate] In order to incorporate these titanium coupling agents into the magnetic layer, they are added to a suitable solvent. The solution obtained by this dissolution can be added when preparing a magnetic paint, or the surface of the magnetic powder can be treated in advance by immersing the magnetic powder in this solution, and the magnetic powder can be used to create a magnetic coating. This is done by methods such as preparing paints. 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, there is a risk of lead-out. It is more preferable to use it in a range of 0.5 to 5% by weight. In addition, the cellulose 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 contained in the magnetic layer together with the titanium coupling agent,
The affinity with the magnetic powder is improved, the dispersion of the magnetic powder is further improved, and the magnetic properties and surface smoothness are further improved. Furthermore, in the magnetic coating film, the cellulose resin is cross-linked via a titanium coupling agent and magnetic powder, increasing flexibility and improving abrasion resistance. Preferred examples of such cellulose resins include nitrocellulose, acetylcellulose, acetylbutylcellulose, methylcellulose, ethylcellulose, benzylcellulose, carboxymethylcellulose, and hydroxycellulose. Specific examples of nitrocellulose include: For example, Asahi Kasei nitrocellulose L1/2, L1/4, L1, H1/4, H1/2,
H1, H5, Daicel Nitrocellulose RS1/
16, RS1/2, RS1, RS2, 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 a mixture 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 Nitrocellulose H1/2 (manufactured by Asahi Kasei Co., Ltd., nitrocellulose) 8 〃 Crisbon 7209 (manufactured by Dainippon Ink Co., Ltd., polyurethane elastomer) 8 〃 Coronate L (manufactured by Nippon Polyurethane Industries, Ltd., trifunctional) (low molecular weight isocyanate compound) 4 Prenact 46B [manufactured by Kenrich Petrochemical Co., Ltd., tetraoctyl bis(ditridecyl phosphite) titanate] 1.6 Carbon Black 4 Cyclohexanone 80 Toluene 80 This composition was heated in a ball mill for about 72 hours A magnetic paint was prepared by mixing and dispersing. Apply this magnetic paint to a thickness of 11μ
After coating the polyester film to a dry thickness of approximately 4μ, drying, and surface treatment,
They cut it to a specified width and made magnetic tape. Comparative Example 1 A magnetic tape was produced in the same manner as in the example except that PreneAct 46B 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 46B 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 reproduction, and the video SN ratio and color SN ratio were measured using a color video noise meter 925C manufactured by Shibasoku Corporation. . 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)
（C2H5）−（CH2−Ｏ−CH2−CH＝CH2）2、Ｘは
Ｐ、Ｙは−（Ｏ−R1）2OH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繊維素系樹脂
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 (RO) 4 -Ti-(X-Y) 2 (wherein R is a hydrocarbon group or -CH 2 -C
( C2H5 )-( CH2 -O- CH2 -CH= CH2 ) 2 , X is P, Y is -(O- R1 ) 2OH , and R1 is an alkyl group. ) A magnetic recording medium having a magnetic layer containing a titanium coupling agent and a cellulose resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9551381A JPS57210434A (en) | 1981-06-20 | 1981-06-20 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9551381A JPS57210434A (en) | 1981-06-20 | 1981-06-20 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57210434A JPS57210434A (en) | 1982-12-24 |
| JPH0248968B2 true JPH0248968B2 (en) | 1990-10-26 |
Family
ID=14139651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9551381A Granted JPS57210434A (en) | 1981-06-20 | 1981-06-20 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57210434A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60107731A (en) * | 1983-11-16 | 1985-06-13 | Kao Corp | Magnetic recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57111829A (en) * | 1980-12-27 | 1982-07-12 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
-
1981
- 1981-06-20 JP JP9551381A patent/JPS57210434A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57111829A (en) * | 1980-12-27 | 1982-07-12 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57210434A (en) | 1982-12-24 |
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