JPH03142710A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH03142710A JPH03142710A JP28129989A JP28129989A JPH03142710A JP H03142710 A JPH03142710 A JP H03142710A JP 28129989 A JP28129989 A JP 28129989A JP 28129989 A JP28129989 A JP 28129989A JP H03142710 A JPH03142710 A JP H03142710A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording medium
- magnetic recording
- fe2o3
- gamma
- 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
- 239000006247 magnetic powder Substances 0.000 claims abstract description 14
- 239000000020 Nitrocellulose Substances 0.000 claims abstract description 13
- 229920001220 nitrocellulos Polymers 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000006229 carbon black Substances 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 4
- 229910052719 titanium Inorganic materials 0.000 abstract description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- 150000004706 metal oxides Chemical class 0.000 abstract description 2
- 229910052758 niobium Inorganic materials 0.000 abstract description 2
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052720 vanadium Inorganic materials 0.000 abstract description 2
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 abstract 4
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 abstract 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract 2
- 230000001050 lubricating effect Effects 0.000 abstract 2
- 229910017061 Fe Co Inorganic materials 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
- -1 polyethylene terephthalate Polymers 0.000 description 6
- 239000003973 paint Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 241000872198 Serjania polyphylla Species 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical class ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 235000008375 Decussocarpus nagi Nutrition 0.000 description 1
- 244000309456 Decussocarpus nagi Species 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
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- DHZWALZKPWZSMA-UHFFFAOYSA-N tetradecyl oleate Natural products CCCCCCCCCCCCCCOC(=O)CCCCCCCC=CCCCCCCCC DHZWALZKPWZSMA-UHFFFAOYSA-N 0.000 description 1
- GKAVWWCJCPVMNR-UHFFFAOYSA-N tridecyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCCCCCCCCCCC GKAVWWCJCPVMNR-UHFFFAOYSA-N 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〕
本発明は磁気記録媒体に関し、詳しくは耐久性に優れた
磁気記録媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium with excellent durability.
〔従来の技術及び発明が解決しようとする課題〕磁気記
録媒体は、記録再生時に磁気ヘッドやパッドなどと激し
く摺動し、磁性層が摩耗されやすいため、磁性層の摩耗
が少なく耐久性に優れたものが望まれている。[Prior art and problems to be solved by the invention] Magnetic recording media slide violently against magnetic heads and pads during recording and reproduction, and the magnetic layer is easily abraded, so the magnetic layer has less wear and is highly durable. something is desired.
このため、磁性層の耐摩耗性を改善する方策として、磁
性層中に種々の潤滑剤を混入する内添法、あるいは磁性
層表面に潤滑層を形成するトップコート法等が行われて
いる。Therefore, as measures to improve the wear resistance of the magnetic layer, methods such as an internal addition method in which various lubricants are mixed into the magnetic layer, or a top coating method in which a lubricant layer is formed on the surface of the magnetic layer have been used.
従来から使用されている潤滑剤としては、高級脂肪酸お
よびそのエステル、脂肪酸アミド、流動パラフィン、シ
リコーンオイル等がある。Conventionally used lubricants include higher fatty acids and their esters, fatty acid amides, liquid paraffin, and silicone oils.
しかしながら、これらの潤滑剤は性能面では満足される
ものとは言い難いのが現状である。However, it is currently difficult to say that these lubricants are satisfactory in terms of performance.
本発明者らは、良好な潤滑性が付与され大幅に耐久性が
改善された磁気記録媒体を得るべく磁性層を形成するバ
インダー並びにカーボンブラックについて鋭意研究の結
果、本発明に到達した。The present inventors have arrived at the present invention as a result of extensive research into binders and carbon black that form the magnetic layer in order to obtain a magnetic recording medium that is imparted with good lubricity and has significantly improved durability.
即ち本発明は、非磁性支持体上に磁性層を有する磁気記
録媒体において、該磁性層が、（ａ）ニトロセルロース
を磁性粉に対して５〜３０重−量％、及び
伽）平均粒径が５０〜３００即のカーボンブラックを磁
性粉に対して２〜２０重量％
含有することを特徴とする磁気記録媒体を提供するもの
である。That is, the present invention provides a magnetic recording medium having a magnetic layer on a non-magnetic support, in which the magnetic layer contains (a) 5 to 30% by weight of nitrocellulose based on the magnetic powder, and (b) average particle size. The present invention provides a magnetic recording medium characterized in that it contains 2 to 20% by weight of carbon black having a particle diameter of 50 to 300% based on the magnetic powder.
本発明の磁気記録媒体に使用される磁性粉としては、針
状形の微細なＴ ＦｅｔＯｉ＋ ＦｅｔＯｎ＋ Ｃｒ
ｙｔのような金属酸化物、またＣｏ被着７ ＦｅｚＯ
ａ＋ＣＯドープ１−Ｆａｔ’ｓのような加工処理を施し
たＴＦｅ！ｒｓ 、金属鉄粉末、微小板状のバリウムフ
ェライト及びそのＦｅ原子の一部がＴｉ、 Ｃｏ、 Ｚ
ｎ。The magnetic powder used in the magnetic recording medium of the present invention includes fine needle-shaped T FetOi+ FetOn+ Cr.
metal oxides such as yt, and also Co-deposited 7 FezO
a+CO doped 1- TFe processed like Fat's! rs, metallic iron powder, barium ferrite in the form of microplates, and some of its Fe atoms are Ti, Co, Z
n.
Ｖ、 Ｎｂ等の１種又は２種以上で置換された磁性粉、
Ｇｏ、 Ｆｅ−Ｇｏｏ Ｆｅ−Ｎｉ等の金属又は合金の
超微粉などが挙げられる。これらのうち金属鉄粉末は特
に化学的に安定性が悪くこの改良のためニッケル、コバ
ルト、チタン、ケイ素、アルミニウムなどを金属原子、
塩及び酸化物の形で少量加えたり表面処理されることが
あるが、これらを用いることもできる。金属鉄粉末は又
その安定化のため弱い酸化性雰囲気の中で表面に薄い酸
化被膜を作らせることがあるが、このように処理された
金属粉を用いることもできる。また前述の磁性粉を２種
以上混合して用いてもよい。Magnetic powder substituted with one or more of V, Nb, etc.
Examples include ultrafine powders of metals or alloys such as Go, Fe-Goo, Fe-Ni, and the like. Among these, metallic iron powder is particularly unstable chemically, and in order to improve this, metal atoms such as nickel, cobalt, titanium, silicon, and aluminum are added.
Salts and oxides, which are sometimes added in small amounts or surface treated, can also be used. Metallic iron powder may also have a thin oxide film formed on its surface in a weakly oxidizing atmosphere to stabilize it, and metal powder treated in this way can also be used. Further, two or more kinds of the above-mentioned magnetic powders may be mixed and used.
本発明においては磁性粉を分散させて磁性層を形成させ
るためのバンイダーとして、ニトロセルロースが用いら
れる。ニトロセルロースとしてはカルボキシル基やスル
ホン基等の極性基を含有するものを使用することもでき
る。ニトロセルロースは磁性粉に対して５〜３０重量％
使用される。In the present invention, nitrocellulose is used as a binder for dispersing magnetic powder to form a magnetic layer. Nitrocellulose containing polar groups such as carboxyl groups and sulfone groups can also be used. Nitrocellulose is 5-30% by weight based on magnetic powder.
used.
また、本発明の磁気記録媒体にはバンイダーとして上記
ニトロセルロースの他に、通常磁気記録媒体に使用され
るものを本発明の効果を損なわない範囲で併用すること
ができる。この場合、全バンイダー中にニトロセルロー
スを少なくとも１０重量％以上含有せしめるのが適当で
ある。上限として５０〜６０重量％含有せしめるのが好
ましい、併用し得るバンイダーとしてはポリウレタン、
ポリ塩化ビニル、塩化ビニル酢酸ビニル共重合体、ポリ
アクリルニトリル、ニトリルゴム、エポキシ樹脂、アル
キッド樹脂、ボリアごド、ポリアクリル酸エステル、ポ
リメタクリル酸エステル、ポリ酢酸ビニル、ポリビニル
ブチラール、塩化ビニリデン、硝化綿、マレイン酸変性
塩化ビニル・酢酸ビニル共重合体、エチルセルロースな
どが挙げられる。就中、ポリウレタンが好ましい、これ
らは単独で用いても、２種以上を混合して用いてもよい
。In addition to the nitrocellulose described above, binders commonly used in magnetic recording media can be used in combination with the magnetic recording medium of the present invention as long as the effects of the present invention are not impaired. In this case, it is appropriate that the total binder contains at least 10% by weight of nitrocellulose. The upper limit of the content is preferably 50 to 60% by weight. Banders that can be used in combination include polyurethane,
Polyvinyl chloride, vinyl chloride vinyl acetate copolymer, polyacrylonitrile, nitrile rubber, epoxy resin, alkyd resin, polyester, polyacrylic acid ester, polymethacrylic acid ester, polyvinyl acetate, polyvinyl butyral, vinylidene chloride, nitrification Examples include cotton, maleic acid-modified vinyl chloride/vinyl acetate copolymer, and ethyl cellulose. Among these, polyurethane is preferred, and these may be used alone or in combination of two or more.
また、樹脂の硬さを調節するため可塑剤や硬化剤を加え
て使用することもできる。Furthermore, a plasticizer or a hardening agent may be added to adjust the hardness of the resin.
更に、本発明の磁気記録媒体には特定粒径を有するカー
ボンブラックを使用する。カーボンブラックとしては平
均単一粒径が５０〜３００ ｒｕのものが用いられ、磁
性粉に対して２〜２０重量％使用される。Furthermore, carbon black having a specific particle size is used in the magnetic recording medium of the present invention. The carbon black used has an average single particle size of 50 to 300 ru, and is used in an amount of 2 to 20% by weight based on the magnetic powder.
本発明の磁気記録媒体の磁性層には以上の成分の他、こ
の分野で通常使用される研磨剤、帯電防止剤等の添加剤
を加えることができる。In addition to the above-mentioned components, additives such as abrasives and antistatic agents commonly used in this field can be added to the magnetic layer of the magnetic recording medium of the present invention.
また、本発明の磁気記録媒体を製造する際に用いられる
非磁性支持体としては、ポリエチレンテレフタレートの
ようなポリエステル；ポリエチレン、ポリプロピレン等
のポリオレフィン；セルローストリアセテート、セルロ
ースジアセテート等のセルロース誘導体；ポリカーボネ
ート；ポリ塩化ビニル；ポリイミド；芳香族ポリアミド
等のプラスチックＨＡＩ、Ｃｕ等の金属；祇等が使用さ
れる。形態はフィルム、テープ、シート、ディスク、カ
ード、ドラム等いずれでもよい、また支持体表面はコロ
ナ放電、放射線、紫外線等で処理されていても、あるい
は適当な樹脂でプレコートされていてもよい。In addition, non-magnetic supports used in manufacturing the magnetic recording medium of the present invention include polyesters such as polyethylene terephthalate; polyolefins such as polyethylene and polypropylene; cellulose derivatives such as cellulose triacetate and cellulose diacetate; polycarbonate; Vinyl chloride; polyimide; plastic HAI such as aromatic polyamide; metal such as Cu; and the like are used. The support may be in any form such as a film, tape, sheet, disk, card, or drum, and the surface of the support may be treated with corona discharge, radiation, ultraviolet light, etc., or may be precoated with a suitable resin.
以下本発明を実施例により更に詳細に説明するが、本発
明がこれら実施例に限定されるものではないことは言う
までもない。EXAMPLES The present invention will be explained in more detail below with reference to Examples, but it goes without saying that the present invention is not limited to these Examples.
実施例１ く磁性塗料の調製〉 下記成分の塗料をサンドミルにて１時間混練した。Example 1 Preparation of magnetic paint> A paint having the following components was kneaded in a sand mill for 1 hour.
凪ＪＬｔｌ！ＬＩＬ底
Ｃｏ被着Ｐｅ５ｏｓ １００重
量部リン酸エステルｍｌ １ ｓ
ニトロセルロース８２９．３
ポリウレタン樹脂” １５．７Ａｆｔ（
ｈ （研磨剤）１０
平均粒径１７ｆＩｕ！のカーボンブラック １４平均
粒径１１０ｍＩ！のカーボンブラック １０トリデシル
ステアレート ５２−デシルテトラデシル
オレエート １パルξチン酸 ２
溶 剤” ３００注）
＊１リン酸エステル：商品名Ｇａｆａｃ ＲＥ６１０＊
２ニトロセルロース：商品名ＢＴＫ−１／８（旭化或製
のニトロセルロース）
＊３ポリウレタン樹脂：商品名Ｎ ２３ＯＮ日本ポリウ
レタン工業製のポリウ
レタン樹脂）
本４溶剤：メチルエチルケトン／トルエン／シクロヘキ
サノン−２／ ２ ／１３
次いで硬化剤としてコロネートしく日本ポリウレタン工
業製のポリイソシアナート化合物）５重量部を入れ、更
に上記溶剤を少量追加して固形分が約３０％になるよう
に調整した。Nagi JLtl! LIL bottom Co-coated Pe5os 100 parts by weight Phosphate ester ml 1 s
Nitrocellulose 829.3 Polyurethane resin 15.7Aft (
h (abrasive) 10 Average particle size 17fIu! Carbon black 14 average particle size 110mI! carbon black 10 tridecyl stearate 52-decyl tetradecyl oleate 1 partic acid 2 solvent 300 Note) *1 Phosphate ester: Product name Gafac RE610*
2 Nitrocellulose: Product name BTK-1/8 (nitrocellulose manufactured by Asahi Kasei) *3 Polyurethane resin: Product name N 23ON polyurethane resin manufactured by Nippon Polyurethane Industries) 4 Solvent: Methyl ethyl ketone/toluene/cyclohexanone-2/2 /13 Next, 5 parts by weight of a polyisocyanate compound manufactured by Nippon Polyurethane Industries Co., Ltd. (Coronate) was added as a curing agent, and a small amount of the above solvent was added to adjust the solid content to about 30%.
〈３．５インチＦＤの調製〉
この磁性塗料を厚さ７５−のポリエチレンテレフタレー
トフィルム上に乾燥膜厚が１．５μになるように塗布し
、カレンダー処理して３．５インチＦＤ用に打抜き、表
面研磨してジャケットに入れて３．５インチＦＤを得る
。<Preparation of 3.5-inch FD> This magnetic paint was applied onto a 75-inch thick polyethylene terephthalate film so that the dry film thickness was 1.5μ, calendered and punched into a 3.5-inch FD. The surface is polished and put into a jacket to obtain a 3.5 inch FD.
謝泌Ｊ［訣
上記によって得られた３、５インチＦＤを３．５インチ
ＦＤ用のドライブに入れ、６０℃、５０％ＲＨの条件で
駆動させた。その結果、５０００万パスでも出力が初期
値の８０％以上であった。The 3.5-inch FD obtained above was placed in a 3.5-inch FD drive and driven at 60° C. and 50% RH. As a result, even after 50 million passes, the output was more than 80% of the initial value.
勤輩蓋五敗皿主
上記と同様のドライブ内で、磁気ヘッドにストレインゲ
ージを取り付ける（この時、ＦＤ表面には４０ｇの荷重
がある）、６０°Ｃ１５０％ＲＨの条件で駆動（３００
ｒｐｍ＋で回転）させ、動摩擦係数を測定したところ０
．２であった。In the same drive as above, a strain gauge is attached to the magnetic head (at this time, there is a load of 40 g on the FD surface), and the drive is carried out at 60°C and 150% RH (300°C).
When the coefficient of dynamic friction was measured, it was 0.
．． It was 2.
実施例２
実施例１の磁性塗料において、ニトロセルロースをＢＴ
Ｋ−１／８からＢＴＫ−１／２に変え、粒径が１１０呻
のカーボンブラックに変えて粒径が２５０ｍのカーボン
ブラックに変えて３．５インチＦＤを作威し、実施例１
と同様の試験を行なったところ、実施例１と同様の結果
が得られた。Example 2 In the magnetic paint of Example 1, nitrocellulose was replaced by BT.
Example 1: K-1/8 was changed to BTK-1/2, carbon black with a particle size of 110 mm was changed to carbon black with a particle size of 250 mm, and a 3.5 inch FD was produced.
When a similar test was conducted, the same results as in Example 1 were obtained.
比較例１
実施例１の磁性塗料において、粒径が１１０ｆｕのカー
ボンブラックを入れずに３．５インチＦＤを作成し、実
施例１と同様の試験を行なったところ、耐久性は２００
０万バスで初期出力の８０％以下となり、動摩擦係数は
０．３であった。Comparative Example 1 A 3.5-inch FD was prepared using the magnetic paint of Example 1 without adding carbon black with a particle size of 110 fu, and the same test as in Example 1 was conducted, and the durability was 200.
After 00,000 buses, the output was less than 80% of the initial output, and the coefficient of dynamic friction was 0.3.
本発明によれば、耐久性及び潤滑性に優れた磁気記録媒
体が得られる。According to the present invention, a magnetic recording medium with excellent durability and lubricity can be obtained.
Claims (1)
％、及び （ｂ）平均粒径が５０〜３００ｍμのカーボンブラック
を磁性粉に対して２〜２０重量％含有することを特徴と
する磁気記録媒体。[Scope of Claims] A magnetic recording medium having a magnetic layer on a non-magnetic support, the magnetic layer comprising: (a) 5 to 30% by weight of nitrocellulose based on magnetic powder; and (b) average particle size. 1. A magnetic recording medium comprising 2 to 20% by weight of carbon black having a particle diameter of 50 to 300 mμ based on magnetic powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28129989A JPH03142710A (en) | 1989-10-27 | 1989-10-27 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28129989A JPH03142710A (en) | 1989-10-27 | 1989-10-27 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03142710A true JPH03142710A (en) | 1991-06-18 |
Family
ID=17637136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28129989A Pending JPH03142710A (en) | 1989-10-27 | 1989-10-27 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03142710A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5023605A (en) * | 1973-06-29 | 1975-03-13 | ||
| JPS57200934A (en) * | 1981-06-02 | 1982-12-09 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
| JPS62212927A (en) * | 1986-03-12 | 1987-09-18 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
-
1989
- 1989-10-27 JP JP28129989A patent/JPH03142710A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5023605A (en) * | 1973-06-29 | 1975-03-13 | ||
| JPS57200934A (en) * | 1981-06-02 | 1982-12-09 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
| JPS62212927A (en) * | 1986-03-12 | 1987-09-18 | Matsushita Electric Ind Co Ltd | Magnetic recording medium |
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