JPS62209722A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62209722A JPS62209722A JP5173486A JP5173486A JPS62209722A JP S62209722 A JPS62209722 A JP S62209722A JP 5173486 A JP5173486 A JP 5173486A JP 5173486 A JP5173486 A JP 5173486A JP S62209722 A JPS62209722 A JP S62209722A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- weight
- magnetic
- recording medium
- magnetic recording
- 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
Links
- 229920005989 resin Polymers 0.000 claims abstract description 32
- 239000011347 resin Substances 0.000 claims abstract description 32
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 239000006247 magnetic powder Substances 0.000 claims abstract description 13
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 12
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 9
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 9
- 229920000642 polymer Polymers 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000000020 Nitrocellulose Substances 0.000 claims description 12
- 229920001220 nitrocellulos Polymers 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 4
- 229940125782 compound 2 Drugs 0.000 claims 1
- 239000004848 polyfunctional curative Substances 0.000 abstract 1
- 229920003002 synthetic resin Polymers 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- 239000003973 paint Substances 0.000 description 4
- 229930185605 Bisphenol Natural products 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical class OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- -1 vinyl-vinyl Chemical group 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- ULBTUVJTXULMLP-UHFFFAOYSA-N butyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCC ULBTUVJTXULMLP-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000007922 dissolution test Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
２ ベーン
本発明は磁性粉をバインダー樹脂に分散して基体上に塗
布し、形成した磁気記録媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 2 Vane The present invention relates to a magnetic recording medium formed by dispersing magnetic powder in a binder resin and coating it on a substrate.
従来の技術
従来より、磁気記録媒体のバインダー樹脂には磁性粉の
分散性、磁気記録媒体の耐久性などを考慮シて、ウレタ
ンプレポリマー、塩化ビニル−酢酸ビニル−ビニルアル
コール共重合体、ニトロセルロース系２部分スルホン化
ポリエステル系などが用いられている。これらは磁性粉
の微粒子化にともない分散性の改良のため水酸基の含有
量を増化したり、スルホン酸基等の極性基を導入してい
る。Conventional technology Traditionally, urethane prepolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, and nitrocellulose have been used as binder resins for magnetic recording media, taking into consideration the dispersibility of magnetic powder and the durability of magnetic recording media. Two-partially sulfonated polyester systems are used. As these magnetic powders become finer particles, the content of hydroxyl groups is increased or polar groups such as sulfonic acid groups are introduced to improve dispersibility.
発明が解決しようとする問題点
しかしながら、上記した構成では微粒子化磁性粉の分散
性にはまだ不充分であり、また、従来よりこれらのバイ
ンダー樹脂の構成は上記したポリウレタン樹脂とニトロ
セルロース樹脂あるいは塩化ビニル−酢酸ビニル−ビニ
ルアルコール共重合体の組合わせに硬化剤としてポリイ
ソシアネート３ ・・−／
化合物を用いるのが行われ、この中でもニトロセルロー
ス樹脂は分散性に優れていることが知られていルカ、ニ
トロセルロース樹脂を用いるとポリインシアネート化合
物との硬化性が低下するため塗膜強度は低下し磁性粉分
散性及び耐久性の両方に優れた製品を得ることは困難で
あるという問題点を有していた。Problems to be Solved by the Invention However, the above structure is still insufficient for the dispersibility of micronized magnetic powder, and the structure of these binder resins has traditionally been the above polyurethane resin and nitrocellulose resin or chloride resin. Polyisocyanate 3...-/compounds are used as curing agents in combinations of vinyl-vinyl acetate-vinyl alcohol copolymers, and among these, nitrocellulose resins are known to have excellent dispersibility. However, when nitrocellulose resin is used, the curability with the polyincyanate compound decreases, resulting in a decrease in coating film strength, making it difficult to obtain a product with excellent magnetic powder dispersibility and durability. was.
本発明は上記した問題点に鑑み、磁性粉の分散性に優れ
、かつ硬化性の優れだノ（インダー樹脂を使用すること
により、磁性粉の分散性及び耐久性に優れた磁気記録媒
体を提供することを目的とする。In view of the above-mentioned problems, the present invention provides a magnetic recording medium with excellent dispersibility and durability of magnetic powder by using an inder resin. The purpose is to
問題点を解決するだめの手段
この目的を達するために、本発明はニトロセルロース樹
脂、ポリウレタン樹脂テトラメチロールビスフェノール
Ａ重合物およびポリイソシアネート化合物をバインダ樹
脂として用いた構成となっている。Alternative Means for Solving the Problems In order to achieve this object, the present invention uses a nitrocellulose resin, a polyurethane resin, a tetramethylol bisphenol A polymer, and a polyisocyanate compound as binder resins.
作 用
本発明は上記した構成により、磁性粉の分散性が良好で
あるため磁気特性も良好で、硬化性にも優れ、塗膜強度
の高い耐久性に優れたものとなる。Effects The present invention has the above-mentioned configuration, so that the dispersibility of the magnetic powder is good, so the magnetic properties are also good, the curability is excellent, and the coating film has high strength and excellent durability.
実施例 以下、本発明の実施例について説明する。Example Examples of the present invention will be described below.
表１に示す組成のバインダー樹脂を用いて下記組成物を
ボールミル中で３ｏ時間混合分散して９種の磁性塗料を
製造した。Using binder resins having the compositions shown in Table 1, the following compositions were mixed and dispersed in a ball mill for 3 hours to produce nine types of magnetic paints.
（ト・Ａ１：存、合）
５ ・・−５
表 １
６ペーノ
磁性粉末 、−Ｆ８２ｏ３ １００重量部ヶーア
ルミナ粉末 ３重量部カーボンブラッ
ク ８重量部ステアリン酸
２重量部ステアリン酸−ｎ−ブチルエステ
ル ７重量部メチルエチルケトン
２００重量部ジク。、キサノン ２００
重量部バインダー樹脂（表１に示す） ４０重量
部この磁性塗料を厚さ７５μｍのポリエステルフィルム
上に厚さが約２μとなるように塗布し、乾燥後カレンダ
処理し、６０℃、２４時間で硬化し、所定の円板寸法に
打ち抜いた後、表面処理研摩して磁気ディスク（試料番
号Ａ１〜Ａ９）を得た。(G・A1: present, combined) 5...-5 Table 1 6Peno magnetic powder, -F82o3 100 parts by weight Alumina powder 3 parts by weight Carbon black 8 parts by weight Stearic acid
2 parts by weight Stearic acid n-butyl ester 7 parts by weight Methyl ethyl ketone
200 parts by weight. , xanon 200
Part by weight Binder resin (shown in Table 1) 40 parts by weight This magnetic paint was applied onto a 75 μm thick polyester film to a thickness of about 2 μm, dried, calendered, and cured at 60°C for 24 hours. Then, after punching into a predetermined disk size, the disks were surface treated and polished to obtain magnetic disks (sample numbers A1 to A9).
比較例
実施例で得られた試料と比較するだめに、バインダー樹
脂の構成を表１に示す様に変化させ、その他は実施例と
同様にして磁気ディスク（試料番号Ｂ１，２）を得た。Comparative Example In order to compare with the sample obtained in Example, magnetic disks (sample numbers B1 and 2) were obtained in the same manner as in Example except that the structure of the binder resin was changed as shown in Table 1.
実施例、比較例で作製した磁性塗料の分散性を得られた
塗膜の表面粗さの測定から、また塗膜の７−。From the measurement of the surface roughness of the coating film obtained by obtaining the dispersibility of the magnetic coating material prepared in Examples and Comparative Examples, and 7- of the coating film.
硬化性をメチルエチルケトンによる溶解試験から判断、
評価したものを表２に示す。まだ、表２に示すように、
得られたディスクを所定のジャケットに挿入して、フロ
ッピーディスクドライバーに挟入し、トラックｏＯに１
２５ＫＨ２の信号を記録し、次いで４０１：、８０％Ｒ
Ｈの条件下で２ｏ○時間運転した後の再生出力の低下を
測定し、ディスクの耐久性を確認した。Curability determined by dissolution test with methyl ethyl ketone.
Table 2 shows what was evaluated. Still, as shown in Table 2,
Insert the obtained disk into the specified jacket, insert it into a floppy disk driver, and place it in the track oO.
Record the signal of 25KH2, then 401:, 80%R
The durability of the disc was confirmed by measuring the decrease in playback output after operating for 20 hours under H conditions.
表 ２
この表２から明らかなようにニトロセルロース樹脂、ポ
リウレタン樹脂、テトラメチロールビスフェノール八重
合物、ポリインシアネート化合物から構成されるバイン
ダ樹脂を用いた磁気ディスクは、磁性粉の分散性、塗膜
の硬化性が良く、再生出力の低下もほとんどが一１０％
以内と耐久性も良いものであった。Table 2 As is clear from Table 2, magnetic disks using a binder resin composed of nitrocellulose resin, polyurethane resin, tetramethylol bisphenol octapolymer, and polyincyanate compound have excellent dispersibility of magnetic powder and hardening of the coating film. The performance is good, and the playback output decreases by almost 110%.
The durability was also good.
尚、ニトロセルロース樹脂としては、無化成工業■製セ
ルツバ等がある。Incidentally, examples of the nitrocellulose resin include Seltsuba manufactured by Mukasei Kogyo ■.
又、ポリウレタン樹脂としては、例えば日本ポリウレタ
ン工業■製のニソポラン−２３０１、＝２３０４、−３
１１３． 三洋化成■ＴＵ−２７１゜Ｔ ｌ−７１２７
、東洋紡製ノＲＶ−８３０、ＲＶ−８２０、大日本イン
キ化学工業■製のＴ−５２６Ｏ３、Ｔ−５２０１、Ｔ−
ＩＮ−１等がある０
テトラメチロールビスフェノール八重合物としては、ビ
スフェノールＡ１モルにアルカリ溶液中でホルムアルデ
ヒド４モルを反応させて得られるテトラメチロールビス
フェノールＡをモノマ単位９・・−２
としてなる重合度２〜１５０重合物である。Examples of polyurethane resins include Nisoporan-2301, =2304, and -3 manufactured by Nippon Polyurethane Industry ■.
113. Sanyo Chemical TU-271゜T l-7127
, Toyobo's RV-830, RV-820, Dainippon Ink &Chemicals' T-526O3, T-5201, T-
IN-1 etc.0 Tetramethylolbisphenol octapolymer is obtained by reacting 1 mol of bisphenol A with 4 mol of formaldehyde in an alkaline solution and has a degree of polymerization of 2 monomer units of tetramethylolbisphenol A with 9...-2 monomer units. ~150 polymer.
ポリイソシアネート化合物としては、例えば日本ポリウ
レタン工業■製のコロネートＬ、武田薬品化学工業■製
のＤ−１０３Ｈ等がある０バインダー樹脂の構成割合は
、ニトロセルロース樹脂とテトラメチロールビスフェノ
ールＡ重合物が重量比で１０＝９ｏ〜９６：５である混
合物とポリウレタン樹脂との割合が重量比で７０：３０
〜２０：８０でアシ、それに組み合わせる硬化剤である
ポリイソシアネート化合物は、ニトロセルロース樹脂、
テトラメチロールビスフェノール八重合物とポリウレタ
ン樹脂の合計１００重量部に対して１０〜４ｏ重量部が
望ましい０
ニトロセルロース樹脂があまり少ないと塗料としての特
性が低下すると伴に分散性もわずかに低下シ、テトラメ
チロールビスフェノール八重合物が少なすぎると硬化性
が低下する。またポリウレタン樹脂が少なすぎると耐摩
耗性が低下する。硬化剤としてのポリイソシアネート化
合物は少なすぎると硬化不充分であり、多すぎると塗膜
をもろ１０ ｔ、−２
くし、基体への密着性を低下させる。Examples of polyisocyanate compounds include Coronate L manufactured by Nippon Polyurethane Industries ■ and D-103H manufactured by Takeda Pharmaceutical and Chemical Industries ■.The composition ratio of the binder resin is nitrocellulose resin and tetramethylol bisphenol A polymer in a weight ratio. The ratio of the mixture and the polyurethane resin is 70:30 by weight, where 10=9o to 96:5.
The polyisocyanate compound which is the curing agent combined with the resin is 20:80, nitrocellulose resin,
It is desirable to use 10 to 4 parts by weight per 100 parts by weight of the tetramethylol bisphenol octapolymer and polyurethane resin. If the amount of nitrocellulose resin is too small, the properties as a paint will deteriorate and the dispersibility will also slightly decrease. If the amount of methylol bisphenol octapolymer is too small, the curability will decrease. Furthermore, if the amount of polyurethane resin is too small, abrasion resistance will decrease. If the amount of the polyisocyanate compound used as a curing agent is too small, curing will be insufficient, and if it is too large, the coating film will become brittle and the adhesion to the substrate will be reduced.
発明の効果
以上のように本発明の磁気記録媒体はバインダー樹脂に
磁性粉、必要に応じて潤滑剤、有機溶剤その他の添加物
を添加混練し、磁性塗料を作製し、それをポリエステル
フィルムなどの基体上に塗布し、乾燥、硬化することに
よシ製造でき、これによれば磁性粉の分散性、塗膜の硬
化性が良好で、しかも耐久性に優れた磁気記録媒体を提
供することができる。Effects of the Invention As described above, the magnetic recording medium of the present invention is produced by kneading a binder resin with magnetic powder, lubricant, organic solvent, and other additives as necessary to prepare a magnetic paint, which is then applied to a polyester film or the like. It can be manufactured by coating it on a substrate, drying and curing it, and by this method, it is possible to provide a magnetic recording medium that has good dispersibility of the magnetic powder, good hardenability of the coating film, and has excellent durability. can.
Claims (2)
を有するものであって、上記バインダー樹脂の構成が、
ニトロセルロース樹脂、ポリウレタン樹脂、テトラメチ
ロールビスフェノールＡ重合物およびポリイソシアネー
ト化合物から成ることを特徴とする磁気記録媒体。(1) A magnetic layer comprising magnetic powder and a binder resin on a substrate, wherein the structure of the binder resin is
A magnetic recording medium comprising a nitrocellulose resin, a polyurethane resin, a tetramethylol bisphenol A polymer, and a polyisocyanate compound.
メチロールビスフェノールＡ重合物が重量比で１０：９
０〜９５：５である混合物とポリウレタン樹脂との割合
が重量比で７０：３０〜２０：８０であり、それら１０
０重量部に対してポリイソシアネート化合物１０〜４０
重量部で構成されることを特徴とする特許請求の範囲第
１項記載の磁気記録媒体。(2) The binder resin is a nitrocellulose resin and a tetramethylol bisphenol A polymer in a weight ratio of 10:9.
The weight ratio of the mixture and polyurethane resin is 0 to 95:5 and is 70:30 to 20:80, and those 10
10 to 40 parts by weight of polyisocyanate compound
2. The magnetic recording medium according to claim 1, wherein the magnetic recording medium is composed of parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5173486A JPS62209722A (en) | 1986-03-10 | 1986-03-10 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5173486A JPS62209722A (en) | 1986-03-10 | 1986-03-10 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62209722A true JPS62209722A (en) | 1987-09-14 |
Family
ID=12895124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5173486A Pending JPS62209722A (en) | 1986-03-10 | 1986-03-10 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62209722A (en) |
-
1986
- 1986-03-10 JP JP5173486A patent/JPS62209722A/en active Pending
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