JPH0572652B2 - - Google Patents
Info
- Publication number
- JPH0572652B2 JPH0572652B2 JP59231560A JP23156084A JPH0572652B2 JP H0572652 B2 JPH0572652 B2 JP H0572652B2 JP 59231560 A JP59231560 A JP 59231560A JP 23156084 A JP23156084 A JP 23156084A JP H0572652 B2 JPH0572652 B2 JP H0572652B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- glycidyl
- type epoxy
- magnetic powder
- vinyl
- 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
- 239000011230 binding agent Substances 0.000 claims description 11
- 239000004593 Epoxy Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 10
- 229920002554 vinyl polymer Polymers 0.000 claims description 9
- 229920005749 polyurethane resin Polymers 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- 229920006026 co-polymeric resin Polymers 0.000 claims description 3
- 239000006247 magnetic powder Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 239000003973 paint Substances 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 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 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical group C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- -1 glycidyl ester Chemical group 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 1
- KUAUJXBLDYVELT-UHFFFAOYSA-N 2-[[2,2-dimethyl-3-(oxiran-2-ylmethoxy)propoxy]methyl]oxirane Chemical compound C1OC1COCC(C)(C)COCC1CO1 KUAUJXBLDYVELT-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- 239000005639 Lauric acid Substances 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
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 125000005233 alkylalcohol group Chemical group 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000003055 glycidyl group Chemical class C(C1CO1)* 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
〔産業上の利用分野〕
この発明は磁気記録媒体に関し、さらに詳しく
は磁性粉末の分散性に優れ、かつ磁性層表面の電
気抵抗が充分に小さい磁気記録媒体に関する。
〔従来の技術〕
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、乾燥してつくられる。この際使用される結合
剤成分としては、磁性粉末の分散性に優れ、磁気
記録媒体に優れた磁気特性ないし電磁変換特性を
付与できるとともに、耐久性に優れるものが望ま
れる。
このため、従来から結合剤樹脂について種々の
研究開発がなされ、これらの特性が優れたものと
して、塩化ビニル−酢酸ビニル系共重合体、繊維
素系樹脂およびポリウレタン系樹脂等が汎用され
ている。
〔発明が解決しようとする問題点〕
ところが、これらの結合剤樹脂は比較的これら
の特性が優れるものの、未だ磁性粉末との親和力
が充分でなく、また併用する樹脂同士の反応性も
それほど高くないため、磁性粉末の分散性はいま
ひとつ充分に満足できるものではなく、磁性層表
面の電気抵抗も充分に小さくならない。
〔問題点を解決するための手段〕
この発明は、かかる現状に鑑み結合剤樹脂につ
いて種々検討を行つた結果なされたもので、磁性
層の結合剤成分として、磁性粉末との親和性に優
れ、かつ併用する塩化ビニル−酢酸ビニル−ビニ
ルアルコール共重合体やポリウレタン樹脂との反
応性に優れたグリシジル型エポキシ化合物を含有
させることによつて、磁性粉末の分散性を改善
し、磁性層表面の電気抵抗を充分に小さくしたも
のである。
この発明において、結合剤成分として使用され
るグリシジル型エポキシ化合物は、分子の末端に
エポキシ基を有し、このエポキシ基が磁性層形成
後の乾燥等における加熱により開環して磁性粉末
表面に存在するOH基と直接に化学結合する。こ
のため、このグリシジル型エポキシ化合物は磁性
粉末に対して非常に強い結合力を発揮して磁性粉
末の粒子表面に強固に結合する。またこの磁性粉
末の粒子表面に強固に結合したこの種のグリシジ
リ型エポキシ化合物は併用する塩化ビニル−酢酸
ビニル−ビニルアルコール共重合体やポリウレタ
ン樹脂とのなじみが非常によい。従つて、磁性粉
末の結合剤樹脂中における分散性が充分に改善さ
れる。また、この種のグリシジル型エポキシ化合
物は、電気密度が分子内部で局在するという特有
の性質を有していることから磁性層表面の電気抵
抗が小さくなり、走行安全性も改善される。
このようなグリシジル型エポキシ化合物として
は、ポリオールを骨格構造として有し、分子中に
グリシジルエーテルを少なくとも１以上含むポリ
グリシジルエーテルを主成分とする分子量が1000
以下のグリシジル型エポキシ化合物、およびポリ
カルボン酸を骨格構造として有し、分子中にグリ
シジルエステルを少なくとも１以上含むポリグリ
シジルエステルを主成分とする分子量が1000以下
のグリシジル型エポキシ化合物が好ましく使用さ
れ、たとえば、下記の構造式で表されるグリシジ
ル型エポキシ化合物が、好適なものとして、単独
で、あるいは二種以上混合して使用される。
[Industrial Application Field] The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium having excellent dispersibility of magnetic powder and sufficiently low electrical resistance on the surface of the magnetic layer. [Prior Art] Magnetic recording media are usually made by applying 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 drying the coating. As the binder component used in this case, it is desired that the binder component has excellent dispersibility of the magnetic powder, can impart excellent magnetic properties or electromagnetic conversion properties to the magnetic recording medium, and has excellent durability. For this reason, various research and developments have been carried out on binder resins, and vinyl chloride-vinyl acetate copolymers, cellulose resins, polyurethane resins, and the like have been widely used as having excellent properties. [Problems to be solved by the invention] However, although these binder resins have relatively excellent properties, they still do not have sufficient affinity with magnetic powder, and the reactivity of the resins used together is not very high. Therefore, the dispersibility of the magnetic powder is not completely satisfactory, and the electrical resistance on the surface of the magnetic layer is not sufficiently reduced. [Means for Solving the Problems] The present invention was made as a result of various studies on binder resins in view of the current situation. In addition, by containing a glycidyl-type epoxy compound that has excellent reactivity with the vinyl chloride-vinyl acetate-vinyl alcohol copolymer and polyurethane resin used in combination, the dispersibility of the magnetic powder is improved and the electricity on the surface of the magnetic layer is improved. It has a sufficiently low resistance. In this invention, the glycidyl-type epoxy compound used as a binder component has an epoxy group at the end of the molecule, and this epoxy group is ring-opened by heating during drying after forming the magnetic layer and is present on the surface of the magnetic powder. chemically bonds directly with the OH group. Therefore, this glycidyl type epoxy compound exhibits a very strong bonding force to the magnetic powder and is firmly bonded to the particle surface of the magnetic powder. Furthermore, this type of glycidyl-type epoxy compound firmly bound to the particle surface of the magnetic powder is very compatible with the vinyl chloride-vinyl acetate-vinyl alcohol copolymer and polyurethane resin used together. Therefore, the dispersibility of the magnetic powder in the binder resin is sufficiently improved. Furthermore, this type of glycidyl-type epoxy compound has the unique property that the electric density is localized inside the molecule, so the electric resistance on the surface of the magnetic layer is reduced, and running safety is also improved. Such a glycidyl-type epoxy compound has a polyol as a skeleton structure, and has a molecular weight of 1000 and is mainly composed of polyglycidyl ether containing at least one glycidyl ether in the molecule.
The following glycidyl-type epoxy compounds and glycidyl-type epoxy compounds having a polycarboxylic acid as a skeleton structure and having a molecular weight of 1000 or less and having a polyglycidyl ester as a main component and containing at least one glycidyl ester in the molecule are preferably used, For example, glycidyl-type epoxy compounds represented by the following structural formula are preferably used alone or in combination of two or more.
【表】【table】
【表】【table】
【表】
（但し、Ｒは炭素数が12または13のアルキル基で
ある。）
アルキルアルコールグリシジルエーテル[Table] (However, R is an alkyl group having 12 or 13 carbon atoms.) Alkyl alcohol glycidyl ether
次に、この発明の実施例について説明する。
実施例 １
Co含有γ−Fe2O3粉末 800重量部
VAGH（米国U.C.C社製、塩化ビニル−酢酸ビニ
ル−酢酸ビニル−ビニルアルコール共重合体）
80 〃
パンデツクスＴ−5201（大日インキ化学工業社製、
ウレタンエラストマー） 60 〃
デナコールEX−622（ナガセ化成社製、ソルビト
ールテトラグリシジルエーテル） 60 〃
レシチン 16 〃
ラウリン酸 12 〃
メチルイソブチルケトン 550 〃
トルエン 550 〃
これらの組成物を容量３のボールミル中で72
時間混合分散した後、これにコロネート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）を15重量部加え、さらに30分間
混合分散して磁性塗料を調製した。この磁性塗料
を、厚さ12μのポリエステルフイルム上に乾燥厚
が6μとなるように塗布、乾燥して磁性層を形成
し、カレンダー処理後、所定の巾に裁断して磁気
テープをつくつた。
実施例 ２〜12
実施例１における磁性塗料の組成において、
VAGH、パンデツクスＴ−5201およびデナコー
ルEX−622の組成比率を下記第１表に示すように
種々に変更して使用した以外は実施例１と同様に
して磁気テープをつくつた。なお、各結合剤樹脂
の組成比率はこれら三種の結合剤樹脂の合計量に
対する重量％で表した。
Next, embodiments of the invention will be described. Example 1 Co-containing γ-Fe 2 O 3 powder 800 parts by weight VAGH (manufactured by UCC, USA, vinyl chloride-vinyl acetate-vinyl acetate-vinyl alcohol copolymer)
80 〃 Pandex T-5201 (manufactured by Dainichi Ink Chemical Co., Ltd.,
Urethane elastomer) 60 Denacol EX-622 (manufactured by Nagase Kasei Co., Ltd., sorbitol tetraglycidyl ether) 60 Lecithin 16 Lauric acid 12 Methyl isobutyl ketone 550 Toluene 550 These compositions were mixed in a ball mill with a capacity of 3.
After mixing and dispersing for a period of time, 15 parts by weight of Coronate L (manufactured by Nippon Polyurethane Kogyo Co., Ltd., a trifunctional low molecular weight isocyanate compound) was added thereto, and the mixture was further mixed and dispersed for 30 minutes to prepare a magnetic paint. This magnetic paint was applied onto a 12 μm thick polyester film to a dry thickness of 6 μm, dried to form a magnetic layer, calendered and cut to a predetermined width to produce a magnetic tape. Examples 2 to 12 In the composition of the magnetic paint in Example 1,
Magnetic tapes were prepared in the same manner as in Example 1, except that the composition ratios of VAGH, Pandex T-5201 and Denacol EX-622 were varied as shown in Table 1 below. In addition, the composition ratio of each binder resin was expressed in weight % with respect to the total amount of these three binder resins.
【表】
実施例１における磁性塗料の組成において、デ
ナコールEX−622に代えてデナコールEX−211
（ナガセ化成社製、ネオペンチルグリコールジグ
リシジルエーテル）を同量使用した以外は実施例
１と同様にして磁気テープをつくつた。
比較例 １
実施例１における磁性塗料の組成において、デ
ナコールEX−622を省き、VAGHの使用量を80
重量部から100重量部に、またパンデツクスＴ−
5201の使用量を60重量部から100重量部に変更し
た以外は、実施例１と同様にして磁気テープをつ
くつた。
各実施例および比較例で得られた磁気テープに
ついて、角型比および表面電気抵抗を測定した。
下記第２表はその結果である。[Table] In the composition of the magnetic paint in Example 1, Denacol EX-211 was used instead of Denacol EX-622.
A magnetic tape was prepared in the same manner as in Example 1, except that the same amount of Neopentyl Glycol Diglycidyl Ether (manufactured by Nagase Kasei Co., Ltd.) was used. Comparative Example 1 In the composition of the magnetic paint in Example 1, Denacol EX-622 was omitted and the amount of VAGH used was reduced to 80%.
parts by weight to 100 parts by weight, and Pandex T-
A magnetic tape was produced in the same manner as in Example 1, except that the amount of 5201 used was changed from 60 parts by weight to 100 parts by weight. The squareness ratio and surface electrical resistance of the magnetic tapes obtained in each example and comparative example were measured. Table 2 below shows the results.
上表から明らかなように、この発明で得られた
磁気テプ（実施例１〜13）は、いずれも従来の磁
気テープ（比較例１）に比し、角型比が高くて、
表面電気抵抗が小さく、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、磁性層の表面電気抵抗も充分に低減さ
れていることがわかる。
As is clear from the above table, the magnetic tapes obtained by this invention (Examples 1 to 13) all have a higher squareness ratio than the conventional magnetic tape (Comparative Example 1).
The surface electrical resistance is small, which indicates that the magnetic recording medium obtained by the present invention has excellent dispersibility of magnetic powder and the surface electrical resistance of the magnetic layer is sufficiently reduced.
Claims (1)
−ビニルアルコール共重合体およびポリウレタン
樹脂から選ばれる少なくとも１種と、グリシジル
型エポキシ化合物とが含まれてなる磁性層を有す
る磁気記録媒体。1. A magnetic recording medium having a magnetic layer containing at least one member selected from vinyl chloride-vinyl acetate-vinyl alcohol copolymer and polyurethane resin and a glycidyl-type epoxy compound as a binder component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23156084A JPS61110334A (en) | 1984-11-01 | 1984-11-01 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23156084A JPS61110334A (en) | 1984-11-01 | 1984-11-01 | Magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61110334A JPS61110334A (en) | 1986-05-28 |
| JPH0572652B2 true JPH0572652B2 (en) | 1993-10-12 |
Family
ID=16925418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23156084A Granted JPS61110334A (en) | 1984-11-01 | 1984-11-01 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61110334A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01267839A (en) * | 1988-04-18 | 1989-10-25 | Fuji Photo Film Co Ltd | Production of magnetic recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5188205A (en) * | 1975-01-31 | 1976-08-02 | JISEITORYONOSEIZOHOHO |
-
1984
- 1984-11-01 JP JP23156084A patent/JPS61110334A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5188205A (en) * | 1975-01-31 | 1976-08-02 | JISEITORYONOSEIZOHOHO |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61110334A (en) | 1986-05-28 |
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