JPS62289924A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS62289924A JPS62289924A JP13110986A JP13110986A JPS62289924A JP S62289924 A JPS62289924 A JP S62289924A JP 13110986 A JP13110986 A JP 13110986A JP 13110986 A JP13110986 A JP 13110986A JP S62289924 A JPS62289924 A JP S62289924A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- weight
- magnetic layer
- fatty acid
- group
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 109
- 239000011347 resin Substances 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 33
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 29
- 239000000194 fatty acid Substances 0.000 claims abstract description 29
- 229930195729 fatty acid Natural products 0.000 claims abstract description 29
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 18
- 125000003700 epoxy group Chemical group 0.000 claims abstract description 17
- -1 fatty acid ester Chemical class 0.000 claims abstract description 14
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 28
- 239000006259 organic additive Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 150000003014 phosphoric acid esters Chemical class 0.000 claims description 5
- 239000006247 magnetic powder Substances 0.000 abstract description 22
- 229910019142 PO4 Inorganic materials 0.000 abstract description 7
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 6
- 239000010452 phosphate Substances 0.000 abstract description 6
- 125000004432 carbon atom Chemical group C* 0.000 abstract description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 5
- 239000000654 additive Substances 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract 3
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 31
- 239000003973 paint Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 11
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 9
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 238000006116 polymerization reaction Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 235000021317 phosphate Nutrition 0.000 description 5
- 239000005639 Lauric acid Substances 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 229930195734 saturated hydrocarbon Natural products 0.000 description 4
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000012046 mixed solvent Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 244000100170 Phaseolus lunatus Species 0.000 description 1
- 235000010617 Phaseolus lunatus Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 229910052785 arsenic Chemical group 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical group [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- PHYFQTYBJUILEZ-IUPFWZBJSA-N triolein Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC(OC(=O)CCCCCCC\C=C/CCCCCCCC)COC(=O)CCCCCCC\C=C/CCCCCCCC PHYFQTYBJUILEZ-IUPFWZBJSA-N 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
３、発明の詳細な説明 3. Detailed description of the invention
本発明は、オーティオ用又はヒテオ用等の磁気？−ブ、
フロッピーティスフ又はハードディスクで７の磁気ディ
スクのような磁気記録媒体に関する乙のである。The present invention is suitable for magnetic applications such as audio or hypothetical applications. -B,
This refers to magnetic recording media such as floppy disks or hard disks.
従来より、磁性粉、バインダ用の樹脂、その他各種の添
加剤等を陰有する磁性塗料を非磁性の支持体上に塗布し
て磁性層を構成した磁気テープ及び磁気ティスフ等の磁
気記録媒体が、数多く提供されてきている。
このような磁気記録媒体において、磁気記録媒体の磁気
特性、磁性層の耐久性、及び電磁変換特性の向上の観点
から、バインダ用の樹脂に注目が向けられ、バインダ用
の樹脂の研究開発が行なわれている９
このような研究開発の成果として、例えは特開昭６０−
２３８３０９号公報に示されるように、塩化ビニルと、
硫黄又はリンを含む強酸のアルカリ金属塩又はアンモニ
ウム塩を有する単量体と、エポキシ基を有する単量体と
、必要に応じてこれらと共重き可能な他の単量体とを共
重合させて得られる塩化ヒニル系樹脂が提案されている
。
この特殊な塩化ビニル系樹脂を磁性層のバインタとして
用いた磁気記録媒体は、確かにそれ相応の効果を発揮す
るものの、この特殊な塩化ビニル系樹脂を磁性層のハイ
ンタとして用いた磁気記録媒体にあっても、充分てない
ことが次第に判ってきた。Conventionally, magnetic recording media such as magnetic tapes and magnetic tapes, which have a magnetic layer formed by coating a non-magnetic support with a magnetic paint containing magnetic powder, binder resin, and various other additives, have been used. Many have been offered. In such magnetic recording media, attention has been focused on resins for binders from the viewpoint of improving the magnetic properties of the magnetic recording media, the durability of the magnetic layer, and the electromagnetic conversion characteristics, and research and development of resins for binders has been conducted. 9 As an example of the results of such research and development,
As shown in Publication No. 238309, vinyl chloride and
By copolymerizing a monomer having an alkali metal salt or ammonium salt of a strong acid containing sulfur or phosphorus, a monomer having an epoxy group, and, if necessary, other monomers that can be copolymerized with these. The resulting hinyl chloride resin has been proposed. Although magnetic recording media that use this special vinyl chloride resin as a binder in the magnetic layer certainly exhibit certain effects, magnetic recording media that use this special vinyl chloride resin as a binder in the magnetic layer do not. Gradually, I realized that even though I had it, it wasn't enough.
本発明者は、特開昭６０−２３８３０９号で提案されて
きた特殊な塩化ビニル系樹脂ても充分な効果が得られな
い点についてさらに研究を押し進めた結果、分子内に〜
ＳＯ，Ｍπ又は−ＯＳＯ３Ｍｕ （Ｍはアルカリ金属の
ような金属又はＮＨ４）とエポキシ基とを有する塩化ビ
ニル系樹脂が磁性層のバインダとして用いられる場合に
おいては、このような塩化ビニル系樹脂が単独で用いら
れた場合には充分な効果が得られず、この塩化ビニル系
樹脂と、脂肪酸、脂肪酸エステル及びリン酸エステルの
群より選ばれる少なくとも一種類の有機添加剤とを併用
した場合に、これらを含む磁性塗料の流、動性が良く、
そしてこの磁性塗料中における磁性粉の分散性が良くな
り、飽和磁束密度等の磁気特性が向上し、又、この磁性
塗料を塗布して得た磁性層の表面光沢度は高く、Ｙ−Ｓ
／Ｎ及びＣ−Ｓ／Ｎ等の電磁変換特性が向上し、又、磁
性層の耐久性が向上し、磁気ヘッドの汚れは起きにくく
なり、又ブロッキングも起きにくいものになることを見
出し、本発明を成し遂げたのである。
すなわち、本発明は、分子内に−ＳＯ８Ｍ基又は０３０
３Ｍ基（Ｍは金属又は旧１．）とエポキシ基とを有する
塩化ビニル系樹脂と、脂肪酸、脂肪酸エステル及びリン
酸ニスデルの群、より選ばれる少なくとも一種類の有機
添加剤とを磁性層中に３ませた磁気記録媒体を提供する
ものである。
尚、上記の塩化ビニル系樹脂におけるエポキシ基の含有
琶は、この塩化ビニル系樹脂の約０．５〜４０重量％で
あることが望ましいものである９すなわち、エポキシ基
が０．５重量％よりはるかに少なくなりずきると、この
塩化ビニル系樹脂をバインダとして構成した磁性層の耐
久性及び熱安定性の特長が小さくなり、又、エポキシ基
が４０重量％を越えて多くなりすぎると、この塩化ビニ
ル系樹脂をバインダとして構成した磁性層が硬くなりす
ぎ力トンダー処理による効果が小さくなるからである。
又、上記の塩ｆヒビニル系樹脂における一ＳＯ，Ｎ基又
はＯ２０，Ｍ基（Ｍは金属又はＮＨ，）の含有蓋は、こ
の塩化ビニル系樹脂の約０．１〜４．０重量％であるこ
とが望ましいものである。すなわち、−３０３Ｍ基又は
−〇ＳＯ，Ｍ基が０．１重量％よりはるかに少なくなり
すぎると、この塩化ビニル系樹脂及び金属磁性粉、六方
晶系フェライＩ・磁性粉又は酸化物系の磁性粉であって
もぞの粒径が極めて小さな超微粒子の磁性粉等を含む磁
性塗料における磁性粉の分散性の改善効果が弱くなり、
又、−５０８Ｍ基又は−０５０８Ｍ基が４．０重Ｉ％を
越えて多くなりすぎると、この塩化ビニル系樹脂の磁・
・性塗料中における溶解性が悪くなり、そして磁性層の
耐湿性の改善効果が弱くなるからである。
又、このような塩化ビニル系樹脂は、その平均重合度が
約２００−６００、より好ましくは約３００〜４００で
あることが望ましい。すなわち、重き度が小さすぎるも
のでは、磁性層の耐久性の改善効果が弱く、又、重ご度
が大きすぎるものでは、これを含む磁性塗料の流動性の
改善効果が弱く、磁性粉の分散性の改善効果が弱くなる
からである。
又、分子内に−ＳＯ３Ｍ基又は−０ＳＯＪ基とエポキシ
Ｖとを有する塩１ヒビニル系樹脂と併用する他の成分で
ある脂肪酸、脂肪酸エステル又はリン酸ニスう一ルのう
ぢ、脂肪酸としては炭素数８〜１８の飽和又は不飽和の
炭化水素基を持つ脂肪酸が望ましく、又、脂肪酸ニスデ
ルとしては、炭素□数８〜・１８の飽和又は、不飽和の
炭化水素基を持つ脂肪酸と炭素数３〜１２の飽和又は不
飽和の炭化水素基を持つ１価又は多価の脂ｉ肪・族アル
コールとのエステルが望ましく、又、リン酸エステルと
しては、
＋１
不飽和の炭ｆヒ水素基）で表わされるものが望ましい。
すなわシ、上記の脂肪酸、脂肪酸エステル及びリン酸エ
ステルにおける炭化水素の炭素数が多・くなりすぎると
、前記の塩化ビニル系樹脂と脂肪酸、脂肪酸エステル及
びリン酸エステルの群より選ばれる少なく、とも一種類
の有機添加剤とを含む磁性塗料の流動性の改善効果が弱
くなり、又、炭素数が少なすぎると、この磁性塗料を覧
布して得た磁性層の可塑効果が大きくて、磁性層の耐久
性の改善効果が弱くなるからである。
又、上記の塩化ビニル系樹脂の含有量は、磁性粉１００
重量部に対して約１０〜４０重量部であることが望まし
く、かつ、上記の脂肪酸、脂肪酸エステル及びリン酸ニ
スデルの群から選ばれる少なくとも一種類の有機添加剤
の含有量は、磁性粉１００重量部に対して約０．１〜１
０重量部であることが望ましく、そして、この塩ｆヒヒ
ニル系樹脂１００重量部に対してこの有機添加剤の量は
約１〜２５重址部であることが望ましい。
すなわち、この塩化ビニル系樹脂の量が少なすぎると、
磁性層の耐久性等のようにバインダとしての機能発揮が
充分とならないからであり、逆に多くなりすぎると、磁
性塗料中における磁性粉の分散性の改善効果が弱くなる
からであり、又、脂肪酸酸等の有機添加剤の量が少な釘
ぎると、磁性層の流動性の改善効果が弱く、磁性粉の分
散性の改善効果が弱くなり、逆に多くなりすぎると滲み
出しが起きる恐れがあるからであり、そして塩化ビニル
系甜脂と有機添加剤との割合が上記のように調整されて
いると、これら両名の併用による相乗効果が著しく大き
くなるからである。As a result of further research into the point where the special vinyl chloride resin proposed in JP-A No. 60-238309 did not provide sufficient effects, the inventor discovered that ~
When a vinyl chloride resin containing SO, Mπ or -OSO3Mu (M is a metal such as an alkali metal or NH4) and an epoxy group is used as a binder for the magnetic layer, such a vinyl chloride resin can be used alone. However, when this vinyl chloride resin is used together with at least one organic additive selected from the group of fatty acids, fatty acid esters, and phosphoric acid esters, these The magnetic paint contains good flow and mobility,
The dispersibility of the magnetic powder in this magnetic paint is improved, and the magnetic properties such as saturation magnetic flux density are improved. Also, the surface gloss of the magnetic layer obtained by applying this magnetic paint is high, and Y-S
We have discovered that the electromagnetic conversion characteristics such as /N and C-S/N are improved, the durability of the magnetic layer is improved, and the magnetic head is less likely to become dirty and blocking. He accomplished the invention. That is, in the present invention, -SO8M group or 030
A vinyl chloride resin having a 3M group (M is a metal or former 1.) and an epoxy group, and at least one organic additive selected from the group of fatty acids, fatty acid esters, and Nisdel phosphates are contained in a magnetic layer. The present invention provides a magnetic recording medium with a magnetic recording capacity of 3. The content of epoxy groups in the above-mentioned vinyl chloride resin is preferably about 0.5 to 40% by weight of the vinyl chloride resin. If the amount of epoxy groups becomes too low, the durability and thermal stability of the magnetic layer composed of vinyl chloride resin as a binder will decrease, and if the amount of epoxy groups exceeds 40% by weight, the chloride This is because the magnetic layer composed of vinyl resin as a binder becomes too hard and the effect of the force tonder treatment is reduced. In addition, the cap containing one SO, N group or O20, M group (M is a metal or NH) in the above-mentioned vinyl chloride-based resin is about 0.1 to 4.0% by weight of the vinyl chloride-based resin. It is desirable that there be one. In other words, if the -303M group or -〇SO,M group becomes much less than 0.1% by weight, the vinyl chloride resin and metal magnetic powder, hexagonal Ferrite I/magnetic powder, or oxide-based magnetism will decrease. Even if it is a powder, the effect of improving the dispersibility of magnetic powder in magnetic paints containing ultrafine magnetic powder with extremely small particle diameters will be weakened.
Also, if the amount of -508M or -0508M groups exceeds 4.0% by weight, the magnetic and
- This is because the solubility in the magnetic paint deteriorates, and the effect of improving the moisture resistance of the magnetic layer becomes weak. Further, it is desirable that the vinyl chloride resin has an average degree of polymerization of about 200-600, more preferably about 300-400. That is, if the weight is too small, the effect of improving the durability of the magnetic layer is weak, and if the weight is too large, the effect of improving the fluidity of the magnetic paint containing it is weak, and the dispersion of the magnetic powder is This is because the effect of improving sex becomes weaker. In addition, fatty acids, fatty acid esters, or phosphoric acid varnishes, which are other components used in combination with the salt containing -SO3M group or -0SOJ group and epoxy V in the molecule, are carbon A fatty acid having a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms is preferable, and a fatty acid having a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms and a saturated or unsaturated hydrocarbon group having 3 carbon atoms are preferable. Esters with monovalent or polyvalent aliphatic alcohols having ~12 saturated or unsaturated hydrocarbon groups are preferable, and as phosphoric acid esters, +1 unsaturated carbon and arsenic groups) are preferred. What is expressed is desirable. In other words, if the number of carbon atoms in the hydrocarbons in the above fatty acids, fatty acid esters and phosphoric esters becomes too large, a small number selected from the group of the above vinyl chloride resins, fatty acids, fatty acid esters and phosphoric esters, The fluidity improvement effect of the magnetic paint containing one type of organic additive will be weak, and if the carbon number is too small, the plasticizing effect of the magnetic layer obtained by distributing the magnetic paint will be large. This is because the effect of improving the durability of the magnetic layer becomes weaker. In addition, the content of the above vinyl chloride resin is 100% of the magnetic powder.
The content of at least one organic additive selected from the group of fatty acids, fatty acid esters, and Nisdel phosphate is preferably about 10 to 40 parts by weight based on 100 parts by weight of the magnetic powder. Approximately 0.1 to 1 part
The amount of the organic additive is desirably 0 parts by weight, and the amount of the organic additive is preferably about 1 to 25 parts by weight based on 100 parts by weight of the salt hihynyl resin. In other words, if the amount of vinyl chloride resin is too small,
This is because the function as a binder such as the durability of the magnetic layer is not sufficiently exhibited.On the other hand, if the amount is too large, the effect of improving the dispersibility of the magnetic powder in the magnetic paint becomes weak. If the amount of organic additives such as fatty acids is too small, the effect of improving the fluidity of the magnetic layer and the dispersibility of the magnetic powder will be weak, and on the other hand, if the amount is too large, oozing may occur. This is because, if the ratio of vinyl chloride-based sugar bean and organic additive is adjusted as described above, the synergistic effect of the combined use of these two components will be significantly increased.
【実施例１】
ＬＯｋ有γ−Ｆｅ２０．の超微粒子の磁性粉１００重量
部、エボ二Ｖシ草（０，５重量％）と−０Ｓ０３Ｎａ基
（２重量％）と分有する平均重合度３００の塩化ビニル
−アリルグリシジルエーテル共重合体１０重量部、ポリ
ウレタ〉′エラストマー１０重量部、粒状晶１２０．３
重量部、ラウリ〉・酸０．５重景部、シクロヘキサノン
とトルエンとの等量混合溶剤２００重量部の組成の混合
物を、サントミルで所定時間混合分散して磁性塗料を作
り、この磁性塗料にポリイソシアネート（日本ポリウレ
タン工業（株）製のコロネートし）１０重量部を添加し
、これをポリエステルフィルム等の非磁性の支持体面上
に塗布し、乾燥後カレンダー処理を施し、その後所定巾
にスリッＴ−して磁気テープ、又は所定の径で打ち抜い
てフロッピーディスク了の磁気記録媒体を得る。[Example 1] γ-Fe20 with LOk. 100 parts by weight of ultrafine magnetic powder of parts, polyurethane〉' Elastomer 10 parts by weight, granular crystals 120.3
A magnetic paint is prepared by mixing and dispersing a mixture of 200 parts by weight, 0.5 parts by weight, 0.5 parts by weight of lauri, 0.5 parts by weight, and 200 parts by weight of a mixed solvent of equal amounts of cyclohexanone and toluene. 10 parts by weight of isocyanate (Coronate, manufactured by Nippon Polyurethane Industries, Ltd.) is added, and this is applied onto the surface of a non-magnetic support such as a polyester film, and after drying, calendering is performed, and then slit T- Then, a magnetic recording medium such as a magnetic tape or a floppy disk is obtained by punching it out to a predetermined diameter.
【実施例２】
実施例１における磁性塗料の組成を、強磁性鉄粉末１０
０重量部、エポキシ基（１，５重量％）と−３Ｏ，ＮＨ
。
墓（１重量部％）とを有する平均重合度４００の塩化ビ
ニル−グリシジルアクリレート共重３１本１５重量部、
ポリウレタンエラストマー１０重量部、粒状晶１２０．
３重量部、プチルスデアｌ、−１−５重量部、メチルエ
チルゲト〉・とｌ・ルエンとの等是混＆溶剤２００重塁
部として同様に行ない、磁気記録媒体を得る。[Example 2] The composition of the magnetic paint in Example 1 was changed to 10% of the ferromagnetic iron powder.
0 parts by weight, epoxy group (1.5% by weight) and -3O,NH
. 15 parts by weight of 31 vinyl chloride-glycidyl acrylate copolymers with an average degree of polymerization of 400,
10 parts by weight of polyurethane elastomer, 120 parts by weight of granular crystals.
A magnetic recording medium is obtained by mixing 3 parts by weight, -1-5 parts by weight of methylethylgeto, and 1-luene and adding 200 parts of the solvent.
【実施例３】
実施例１における磁性塗料の組成を、ハリウムフェライ
ｌ−磁性粉１００重量部、エポキシ基（５重量％）と−
０３Ｏ，ＮＨ，基（０，５重量％）とを有する平均重合
度３５０の塩化しニル−メタリルグリシジルエーテル共
重き体１０重１部、ポリウレタン上ラス１〜マーフ重量
部、粒状＾１２０３３重量部、モノ（ジブチル）アシッ
ドホスフェート２重量部、メチルエチルケトンとトルエ
ンとの等量混合溶剤１５０重鼠部として同様に行ない、
磁気記録媒体を得る。[Example 3] The composition of the magnetic paint in Example 1 was changed to 100 parts by weight of halium ferrite l-magnetic powder, epoxy group (5% by weight) and -
10 parts by weight of a chlorinated nyl-methallyl glycidyl ether copolymer with an average degree of polymerization of 350 having O, NH, groups (0.5% by weight), 1 to 1 part by weight of polyurethane lath, 12033 parts by weight of granules The same procedure was carried out using 2 parts by weight of mono(dibutyl) acid phosphate and 150 parts by weight of a mixed solvent of equal amounts of methyl ethyl ketone and toluene.
Obtain a magnetic recording medium.
【実施例４】
実施例１における磁性塗料の組成を、ＣｒＯ２の超微粒
子の磁性粉１． Ｏ０重量部、エポキシ基（２０重量％
と一３Ｏ８に基（４重量％）とを有する平均重合度３５
０の塩１ヒビニルーグリシジルアクリレート共重合体１
０重量部、ポリクーレタンエラストマー１０重量部、粒
状Ａｌ２Ｏ５３重足部、オレイン＃８重量部、シクロヘ
キサノンとトルエンとの等量混合溶剤２００重量部とし
て同様に行ない、磁気記録媒体を得る。[Example 4] The composition of the magnetic paint in Example 1 was changed to 1. magnetic powder of ultrafine CrO2 particles. O0 parts by weight, epoxy group (20% by weight
and -3O8 groups (4% by weight) with an average degree of polymerization of 35
0 salt 1 hibinyl-glycidyl acrylate copolymer 1
The same procedure was carried out using 0 parts by weight of the polyurethane elastomer, 10 parts by weight of the polycoolethane elastomer, 3 parts by weight of granular Al2O5, 8 parts by weight of olein #, and 200 parts by weight of a mixed solvent of equal amounts of cyclohexanone and toluene to obtain a magnetic recording medium.
【比較例１】
実施例１において、ラウリン酸を全く用いないで同様に
行ない、磁気記録媒体を看る。[Comparative Example 1] The same procedure as in Example 1 was carried out without using any lauric acid, and the magnetic recording medium was observed.
【比較例２】
実施例１において、ラウリン酸の代りにステアリン酸ア
ミドを用いて同様に行ない、磁気記録媒１本を得る。Comparative Example 2 The same procedure as in Example 1 was carried out using stearic acid amide instead of lauric acid to obtain one magnetic recording medium.
【比較例３】
実施例１において、ラウリン酸の代りにジオクチルフタ
レートを用いて同様に行ない、磁気記録媒体を得る。Comparative Example 3 A magnetic recording medium was obtained by carrying out the same procedure as in Example 1 using dioctyl phthalate instead of lauric acid.
【比較例４】
実施例１において、ラウリン酸の代りに粘度１００〜５
００ｃｐｓの鉱物油を用いて同様にｉ′ｉない、磁気記
録媒体を得る。[Comparative Example 4] In Example 1, viscosity 100-5 was used instead of lauric acid.
Similarly, a magnetic recording medium with i′i is obtained using mineral oil of 00 cps.
【比較例５】
実施例１における塩化ビニル系共重合体として、−ＱＳ
Ｏ３Ｎａ基（２重量％）を有するものの、エポキシ基を
有さない平均重合度３００の塩化ビニル−酢酸ビニル共
重合体を用いて同様に行ない、磁気記録媒体を得る。[Comparative Example 5] As the vinyl chloride copolymer in Example 1, -QS
A magnetic recording medium is obtained by carrying out the same procedure using a vinyl chloride-vinyl acetate copolymer having an average degree of polymerization of 300 and having an O3Na group (2% by weight) but no epoxy group.
【比較例６】
実施例１における塩化ビニル系共電ａ体として、エポキ
シ基（０，５重量％）を有するものの、−０Ｓ０３Ｎａ
基を在さない平均重合度３００の塩化ヒニル−アリルグ
リシジルエーテル共重き体を用いて同様に行ない、磁気
記録媒体を得る。[Comparative Example 6] Although the vinyl chloride co-electrode a in Example 1 has an epoxy group (0.5% by weight), -0S03Na
A magnetic recording medium is obtained by carrying out the same procedure using a hinyl chloride-allyl glycidyl ether copolymer having no groups and having an average degree of polymerization of 300.
【比較例７】
実施例１における塩化ビニル光重自体として、塩化ビニ
ル−ビニルアルコール−酢酸ビニル共重合体を用いて同
様に行ない、磁気記録媒体を得る。Comparative Example 7 A magnetic recording medium was obtained in the same manner as in Example 1 using a vinyl chloride-vinyl alcohol-vinyl acetate copolymer as the vinyl chloride light weight itself.
上記各側で得た磁気記録媒体において、この磁気記録媒
体の磁性層構成に用いた磁性層ｉ＋の流動性、最大磁束
密度、光沢度、Ｙ−Ｓ／Ｎ、 Ｃ−Ｓ／Ｎ、磁気ヘット
の汚れ、フロラキング、磁性塗膜層のヤング率の変化、
及びフロッピーティスフにおける耐久性パス回数を調べ
たので、これらの結果を表に示す。
尚、これらの特性において、磁性塗料の流動性は、目視
て判定したものであり、又、最大磁束密度は、振動試料
型磁力計を用いて印加磁場５ＫＯｅて（ｌＵＩ定したも
のてあり、光沢度は、磁性塗料を塗布したサンプルに対
して、入射角６０゛にして光沢度計で測定したものてあ
り、Ｙ−Ｓ／Ｎ及びＣ−Ｓ／Ｎは、ヤシクン１〜＆金磁
気ヘッドを用いたＲＨ−２２００型ヒテオデーフ”レコ
ータ（日本ビクター（株）製）を用いて判定しだものて
あり、又、磁気ヘットの汚れは、４０゛Ｃ１８０％旧１
の環境下で磁気テープｉ １００時間走行させた際の汚
れを目視で判定したものであり、又、ブロンキングは、
６０℃、９０％九Ｈの環境下に磁気デーフ゛を１００時
間保存した後のブロンキング性を自現で判定したものて
あり、又、磁性層膜層のヤング率の変化は初期値に対す
る変化分て表わしたものであり、又、耐久性パス回数は
、５２．５℃、３０％ＲＨの環境下で、同一個所を繰り
返し再生し、出力信リレベルか初期値の６０％になるま
でのパス回数を示したものである。
これによれは、本実施例の磁気記録媒体の磁性層構成に
、用いた磁性層１′−１はその流動性が良いものてあり
、この結果特に凝集しやすいような磁性粉であってもこ
の磁性粉の分散性か良く、最大磁束密度等の磁気特性の
向上が大きく、又、本実施例の磁気記録媒体の磁性層の
表面光沢度は高く、Ｙ−３／Ｎ及びＣ−Ｓ／Ｎ等の電磁
変換特性の向上か大きく、又、磁性層の耐久性の向上が
大きく、磁性層の粉落ちによる磁気ヘッドの汚れは著し
く少ないものであり、又、耐久性パス回数は著しく多く
、又、高温高湿下ての保存によってもブロッキングが起
きず、かつ磁性層のヤング率の変化が極めて小さいこと
から、磁性層の塗膜強度の劣１ヒが極めて小さく、熱安
定性に富んでいることかわかる。
これに対して、本発明に用いた塩化ビニル系樹脂か用い
られても、脂肪酸、脂肪酸ニスデル及びリン酸エステル
の群から選ばれる有機添加剤が用いられていない比較例
１のものては、磁性塗料の流動性か悪く、この結果磁性
粉の分散性が悪い為最大磁束密度が小さく、磁気特性は
良くなく、又、表面光Ｊ〈度か低くて、電磁変換特性か
悪く、又、（鐵気ヘソ１〜の汚れも認められるように磁
性層の耐久性も良くなく、かつヤング率の変化が大きい
ことから磁性層の熱的安定性に乏しく 、７ｊｔ劣１ヒ
が著しい乙のであり、又、比較例２−４のように、脂肪
酸、脂肪酸エステル又はリン酸エステルに代る池の有機
添加剤を本発明に用いた塩化ビニル系樹脂と併用しても
、これらの場＆には表に示す特性かられかるようにＯＦ
用による相乗効果か認められないものてあり、又、比較
例５．６のように、脂ＩＩＩ、酸、脂肪酸エステル及び
リン酸ニスデルの群がら選はれる有機添加剤が塩化ビニ
ル系（Ｊ脂とθｒ用されても、この塩化しニル系樹脂か
本発明で用いノー塩化ビニル系樹脂力ように−ＳＱ、Ｍ
基又は−０３０３Ｍ基とエポキシ基とを共に有するタイ
プのものでない賜キには、表に示す特性かられかるよう
に併用による相乗効果が認められないものであり、又、
比較例７のように、塩化ビニル系樹脂かこれまての一般
的なタイプのものであっても、併用による相乗効果か認
められないものである。In the magnetic recording medium obtained on each side above, the fluidity of the magnetic layer i+ used in the magnetic layer configuration of this magnetic recording medium, maximum magnetic flux density, glossiness, Y-S/N, C-S/N, magnetic head stains, floraking, changes in Young's modulus of the magnetic coating layer,
The results are shown in the table. Regarding these characteristics, the fluidity of the magnetic paint is determined visually, and the maximum magnetic flux density is determined by applying a magnetic field of 5 KOe (lUI) using a vibrating sample magnetometer. The degree is measured using a gloss meter at an incident angle of 60 degrees on a sample coated with magnetic paint. The stains on the magnetic head were determined using the RH-2200 type Hiteodef recorder (manufactured by Victor Japan Co., Ltd.) used.
The stains were determined visually after running the magnetic tape i for 100 hours under the following conditions.
The bronking property of the magnetic diff after being stored for 100 hours in an environment of 60°C and 90% H was determined by hand, and the change in the Young's modulus of the magnetic layer was determined by the change from the initial value. The number of durability passes is the number of passes until the output signal level reaches 60% of the initial value by repeatedly reproducing the same part in an environment of 52.5°C and 30% RH. This is what is shown. This is because the magnetic layer 1'-1 used in the magnetic layer structure of the magnetic recording medium of this example has good fluidity, and as a result, even if magnetic powder is particularly prone to agglomeration, This magnetic powder has good dispersibility, greatly improves magnetic properties such as maximum magnetic flux density, and the surface gloss of the magnetic layer of the magnetic recording medium of this example is high, and Y-3/N and C-S/ The electromagnetic conversion characteristics of N etc. are greatly improved, the durability of the magnetic layer is also greatly improved, there is significantly less contamination of the magnetic head due to falling particles of the magnetic layer, and the number of durability passes is significantly higher. In addition, blocking does not occur even when stored under high temperature and high humidity, and the change in the Young's modulus of the magnetic layer is extremely small, so there is very little deterioration in the coating strength of the magnetic layer, and it is highly thermally stable. I know it's there. On the other hand, although the vinyl chloride resin used in the present invention was used, the material of Comparative Example 1, in which no organic additive selected from the group of fatty acids, fatty acid Nisder, and phosphoric acid esters was used, had no magnetic properties. The fluidity of the paint is poor, and as a result, the dispersibility of the magnetic powder is poor, resulting in a low maximum magnetic flux density and poor magnetic properties.Also, the surface light J is low, and the electromagnetic conversion properties are poor. The durability of the magnetic layer is not good, as evidenced by stains on the belly button 1~, and the thermal stability of the magnetic layer is poor due to large changes in Young's modulus, and the 7JT inferiority 1H is significant. As in Comparative Example 2-4, even if organic additives in place of fatty acids, fatty acid esters, or phosphoric acid esters are used in combination with the vinyl chloride resin used in the present invention, the results shown in the table are OF as you can see from the characteristics
In addition, as shown in Comparative Example 5.6, organic additives selected from the group of fat III, acids, fatty acid esters, and Nisdel phosphate were used in combination with vinyl chloride (J fat and Even if θr is used, this chlorinated vinyl-based resin is used in the present invention, as is the non-vinyl chloride-based resin used in the present invention.
As can be seen from the properties shown in the table, there is no synergistic effect when used in combination with a type of compound that does not have both an epoxy group or a -0303M group and an epoxy group, and
As in Comparative Example 7, even when vinyl chloride resin is used, which is a conventional type, no synergistic effect is observed when used in combination.
本発明に係る磁気記録媒体は、分子内に一３Ｏ，Ｍ基又
は−０５０３Ｍ、Ｍ （Ｍは金属又はＮｌ＋、）とエポ
キシ基とを有する塩化ビニル系樹脂と、脂肪酸、脂肪酸
ニスデル及びリン酸エステルの群より選ばれる少なくと
も一種類の有機添加剤とを、磁性層中に含ませたのて、
これらの両者を含む磁性塗料の流動性が良く、従って磁
性粉の分散性に優れ、が−ノ最大磁束密度等の磁気特性
が良くなり、又、表面光沢度が高＜ 、Ｙ−Ｓ／Ｎ及び
Ｃ−Ｓ／Ｎ等の電磁変換特性も良く、さらには磁気ヘッ
ドの汚れが少な いこと及び耐久性パス回数が多いこ
とから磁性層の耐久性に置れており、しかもフロラキン
グが起きに＜＜、かつヤング率の変化が小さいことかへ
磁性層の耐熱性及び熱的安定性に優れている等の特長を
有する。The magnetic recording medium according to the present invention comprises a vinyl chloride resin having a -3O,M group or -0503M,M (M is a metal or Nl+) and an epoxy group in the molecule, and a fatty acid, a fatty acid Nisdel, and a phosphate ester. At least one kind of organic additive selected from the group of is included in the magnetic layer,
Magnetic paint containing both of these has good fluidity, and therefore has excellent dispersibility of magnetic powder, has good magnetic properties such as maximum magnetic flux density, and has high surface gloss, Y-S/N. It also has good electromagnetic conversion characteristics such as C-S/N, less dirt on the magnetic head, and a large number of durability passes, which makes the magnetic layer more durable. It has features such as a small change in Young's modulus and excellent heat resistance and thermal stability of the magnetic layer.
Claims (1)
属又はＮＨ＿４）とエポキシ基とを有する塩化ビニル系
樹脂と、脂肪酸、脂肪酸エステル及びリン酸エステルの
群より選ばれる少なくとも一種類の有機添加剤とを、磁
性層中に含ませたことを特徴とする磁気記録媒体。A vinyl chloride resin having a -SO_3M group or -OSO_3M group (M is a metal or NH_4) and an epoxy group in the molecule, and at least one organic additive selected from the group of fatty acids, fatty acid esters, and phosphoric acid esters. A magnetic recording medium characterized in that a magnetic layer contains:
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13110986A JPS62289924A (en) | 1986-06-07 | 1986-06-07 | Magnetic recording medium |
| US07/059,258 US4868046A (en) | 1986-06-07 | 1987-06-05 | Magnetic recording mediums comprising a modified vinyl chloride resin binder in at least a magnetic recording layer |
| DE19873718957 DE3718957A1 (en) | 1986-06-07 | 1987-06-05 | MAGNETIC RECORDING MEDIA COMPRISING AT LEAST IN A MAGNETIC RECORDING LAYER A MODIFIED VINYL CHLORIDE RESIN |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13110986A JPS62289924A (en) | 1986-06-07 | 1986-06-07 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62289924A true JPS62289924A (en) | 1987-12-16 |
Family
ID=15050191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13110986A Pending JPS62289924A (en) | 1986-06-07 | 1986-06-07 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62289924A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02108226A (en) * | 1988-10-18 | 1990-04-20 | Fuji Photo Film Co Ltd | Magnetic recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6226630A (en) * | 1985-07-27 | 1987-02-04 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
-
1986
- 1986-06-07 JP JP13110986A patent/JPS62289924A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6226630A (en) * | 1985-07-27 | 1987-02-04 | Konishiroku Photo Ind Co Ltd | Magnetic recording medium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02108226A (en) * | 1988-10-18 | 1990-04-20 | Fuji Photo Film Co Ltd | Magnetic recording medium |
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