JPH0289215A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH0289215A JPH0289215A JP24050588A JP24050588A JPH0289215A JP H0289215 A JPH0289215 A JP H0289215A JP 24050588 A JP24050588 A JP 24050588A JP 24050588 A JP24050588 A JP 24050588A JP H0289215 A JPH0289215 A JP H0289215A
- Authority
- JP
- Japan
- Prior art keywords
- vinyl
- alcohol copolymer
- vinyl alcohol
- vinyl acetate
- vinyl chloride
- 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
- 229920001577 copolymer Polymers 0.000 claims abstract description 36
- 239000006247 magnetic powder Substances 0.000 claims abstract description 18
- 125000000542 sulfonic acid group Chemical group 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 229920002554 vinyl polymer Polymers 0.000 claims description 24
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 13
- 238000006116 polymerization reaction Methods 0.000 claims description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 abstract description 10
- 239000006185 dispersion Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 abstract 6
- 239000000052 vinegar Substances 0.000 description 9
- 235000021419 vinegar Nutrition 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-N acetic acid Substances CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- -1 vinyl-vinyl Chemical group 0.000 description 3
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- ULBTUVJTXULMLP-UHFFFAOYSA-N butyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCCC ULBTUVJTXULMLP-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- TWJNQYPJQDRXPH-UHFFFAOYSA-N 2-cyanobenzohydrazide Chemical compound NNC(=O)C1=CC=CC=C1C#N TWJNQYPJQDRXPH-UHFFFAOYSA-N 0.000 description 1
- 235000002566 Capsicum Nutrition 0.000 description 1
- TUNFSRHWOTWDNC-UHFFFAOYSA-N Myristic acid Natural products CCCCCCCCCCCCCC(O)=O TUNFSRHWOTWDNC-UHFFFAOYSA-N 0.000 description 1
- 235000021360 Myristic acid Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000006002 Pepper Substances 0.000 description 1
- 235000016761 Piper aduncum Nutrition 0.000 description 1
- 235000017804 Piper guineense Nutrition 0.000 description 1
- 244000203593 Piper nigrum Species 0.000 description 1
- 235000008184 Piper nigrum Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001588 bifunctional effect Effects 0.000 description 1
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 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
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006277 sulfonation reaction Methods 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ｒｉ磁′Ａ記碌媒体Ｖこ係わり、さらに肝しくｒ
ｉその結合剤の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to magnetic recording medium V, and more importantly,
iRegarding improvements in the binder.
従来、磁気記録媒体には、塩化ビニル−酢酸ビニル−ビ
ニルアルコール共重合体などを結合剤として用いたもの
が多い、しかし近年媒体の高性能化、高′ＩＢ度記録化
に伴ないａａ注材としても微粒子化（比表面積５０ ｄ
／ｉ以上）とか高活性な金属感ａ！！＆が用いられるよ
うになり、この感注扮の分散を艮くするには、従来の結
合剤では不十分であり几。そのため結合剤分子中に含′
！！れるＯｆ（基の数を増し之り１分子中ＩＣＣ０ＯＨ
！に尋人し之り。Traditionally, many magnetic recording media have used vinyl chloride-vinyl acetate-vinyl alcohol copolymers as binders, but in recent years, with the advancement of media performance and high IB recording, AA injection materials have been used. Even if it is made into fine particles (specific surface area 50 d
/i or higher) or a highly active metal feeling a! ! Traditional binders are insufficient to reduce the dispersion of these sensitive adhesives. Therefore, the binder molecules contain
! ! Of (increasing the number of groups and increasing the number of ICC0OH groups in one molecule)
! Hirojin is here.
コール共重合体のび用が数多く提案されている。Many applications of coal copolymers have been proposed.
しかしながら、ｆ＆近ｒｘ磁磁性の微粒子化、あるいは
高活性な金Ｍ４磁性粉も微粒子化がさらに進み。However, the finer particles of f&near rx magnetism and the finer particles of highly active gold M4 magnetic powder are progressing.
親水基変性樹脂を結合剤としても尚出注扮の分散が不十
分でるる。Even if a hydrophilic group-modified resin is used as a binder, the dispersion of the resin is still insufficient.
この発明ｄ：、上記上記製米製品っていた磁性粉の分数
不良という欠点全解決し、以って４磁変換特性に優れた
ｄ″Ａ記録媒体を提供することを目的とする。The object of this invention is to overcome the drawback of the defective fraction of magnetic powder in the above-mentioned rice products, and thereby provide a d''A recording medium having excellent four-magnetic conversion characteristics.
（１！ｉ題を解決するｔめの手段〕
本発明者らは、上記欠点を解決すべく、鋭意研究ｔ”ｆ
ｌ！；Ｑた結果、磁性粉を低分子ｔ（ｆｆｉ合度２００
以下）のスルホン酸基あるいはその塩を導入した塩化ビ
ニル−酢酸ビニル−ビニルアルコール共重合体上、高分
子量（重合度３５０以上）の塩化ビニル−酢酸ビニル−
ビニルアルコール共ｉｉ、合［−含む結合剤で分散させ
ることにより、磁性粉の分散が向上し、しかも媒体の耐
久性も優れ比ものが得られること全見出し本発明をなす
に至った。(1! tth means for solving problem i) In order to solve the above-mentioned drawbacks, the present inventors have conducted extensive research t”f
l! ; As a result, the magnetic powder was made of low molecular weight t (ffi degree 200
High molecular weight (degree of polymerization 350 or more) vinyl chloride-vinyl acetate-
By dispersing the magnetic powder with a binder containing vinyl alcohol, the dispersion of the magnetic powder is improved, and the durability of the medium is also excellent, which led to the present invention.
本発明で用いる低分子量スルホン酸基あるいはその塩を
導入した環化ビニルー酢酸ビニル−ビニルアルコール共
重合体は次のよう＆（Ｌ、て得らルる。The cyclized vinyl-vinyl acetate-vinyl alcohol copolymer into which a low molecular weight sulfonic acid group or a salt thereof has been introduced for use in the present invention is obtained by &(L) as follows.
出発原料としては市販の塩ビー酸ビービニルアルコール
共１合体を沈澱分別を行い、その低分子量成分を用いて
常法によりスルホン化する。例えばＣＪＲＯ８ＯｓＭ、
ＣｇＲ８ＯｓＭｅどと脱［２反応サセ”ｃ得る。ある
いｉ’ｉＨＯＲＯ８ＯｓＭ、ＨＯＲ８ＯｓＭなどと２官
能インシアネートとを等モル反応させ念後、上記共１合
体上反応させて得ることもできる。As a starting material, a commercially available monomer of beric chloride and vinyl alcohol is precipitated and fractionated, and its low molecular weight components are used for sulfonation by a conventional method. For example, CJRO8OsM,
It can also be obtained by reacting equimolar amounts of HORO8OsM, HOR8OsM, etc. with a bifunctional incyanate, and then reacting them with the above-mentioned compounds.
また高分子量塩化ビニル−酢酸ビニル−ビニルアルコー
ル共重合体は市販品がある。例えばＵＣＣ社製、ＶＡＧ
Ｈ，セキスイ化学社製エスレツクＡ。Further, high molecular weight vinyl chloride-vinyl acetate-vinyl alcohol copolymers are commercially available. For example, manufactured by UCC, VAG
H, Esrec A manufactured by Sekisui Chemical Co., Ltd.
電気化学社製１０００ ＧＫＴなどが挙げられる。Examples include 1000 GKT manufactured by Denki Kagaku Co., Ltd.
また低分子量のスルホン酸基あるいはその塩含有塩化ビ
ニル−酢酸ビニル−ビニルアルコール共重合体上高分子
量塩化ビニル−酢酸ビニル−ビニルアルコール共重合体
上の混合割合は、高分子量残置合体１００重量部に対し
低分子量共重合体がｌθ〜４０璽盪部であるのが望まし
い。低分子量共重合体の配合量がｌＯ直量部以下になる
と磁性粉の分散性が不十分となり、ｔｅ、ｚの配合量が
４０重量部以上になると磁性１−の耐久性が低下する、
このように、磁性粉と親和力の強いスルホン酸基あるい
はその塩を含有した低分子量塩化ビニル−酢酸ビニル−
ビニルアルコール共重合体は、磁性粉の分ａｔ−良くシ
、これと均一に混ざり合っている高分子量塩化ビニル−
酢酸ビニル−ビニルアルコール共重合体は、この分散し
次磁性粉の塗料時の分散安定性を良くするように働くと
ともに。The mixing ratio of the low molecular weight sulfonic acid group or its salt-containing vinyl chloride-vinyl acetate-vinyl alcohol copolymer to the high-molecular weight vinyl chloride-vinyl acetate-vinyl alcohol copolymer is 100 parts by weight of the high molecular weight residual polymer. On the other hand, it is desirable that the low molecular weight copolymer has lθ~40 parts. When the amount of the low molecular weight copolymer is less than 10 parts by weight, the dispersibility of the magnetic powder becomes insufficient, and when the amount of te and z is more than 40 parts by weight, the durability of the magnetic 1- decreases.
In this way, low molecular weight vinyl chloride - vinyl acetate - containing a sulfonic acid group or its salt that has a strong affinity with magnetic powder
The vinyl alcohol copolymer has a high molecular weight vinyl chloride mixed uniformly with the magnetic powder.
The vinyl acetate-vinyl alcohol copolymer works to improve the dispersion stability of this dispersed sub-magnetic powder during coating.
磁性ノーとしたときノーの耐摩耗性等、耐久性の改善に
有効に作用する。When it is magnetic, it effectively works to improve durability such as wear resistance.
結合剤成分としては、必要に応じてポリウレタン樹脂、
低分子量多官能イソシアネートを用いてもよい。As a binder component, polyurethane resin,
Low molecular weight polyfunctional isocyanates may also be used.
本発明で使用できる磁性粉は従来公知のもの何れも便用
できるが、特に微粒子ａＢ性粉（ＳＢＥＴ＝５０ｒｌ１
９以上）、活性な磁性粉を用いた場合に。As the magnetic powder that can be used in the present invention, any conventionally known magnetic powder can be used, but particularly fine particle aB powder (SBET=50rl1
9 or more), when using active magnetic powder.
その効果が顕著に現はれる。The effect is noticeable.
以Ｆ１本発明を実施例に基づき詳説する。 Hereinafter, the present invention will be explained in detail based on examples.
実施例１
Ｃｏ−γ−Ｆｅ２ｅｓ （５ＢＥＴ＝ ５０ ｉ／ ９
） ８０ ｉｆｉ部スルホン酸基含有塩ビー酢ビービ
ニルアルコール共重合体（１合度１８０）
２直ｍ１ｔｔｓ塩ビー酢ビービニルアルコール共重合体
（重合度４００ ） ６重量
部ポリウレタン樹脂（日本ポリウレタン社製、ニラポラ
ンＮ２３０１ ） １０重量部ポリイ
ソンアネート化合物（日本ボリウレタ／社製、コロネー
トＬ） ２ポ盪部アルミナ
５直を部ミリスチン訪
２直童部ステアリン酸ｎ−ブチル １直
盪部メチルエチルケトン ＩＬ）Ｏｄｉｆ
ｉ部７クロヘキ丈ノン １００重量部ト
ルエン １００改量部と記組成
物をサンドミルで分散し次後、ｆ過積製し、この塗料を
厚さ１４μ鴨のポリエチレンテレ７ｐＶ−）フィルム上
に、乾燥後の塗膜厚が５μ惟になるように塗布後、ｍ面
＠理をし、これを所定幅にスリットして磁気テープを作
製した。Example 1 Co-γ-Fe2es (5BET=50 i/9
) 80 ifi part sulfonic acid group-containing chloride, vinegar, vinyl alcohol copolymer (1 degree: 180)
2mm 1tts Salt, vinegar, vinyl alcohol copolymer (degree of polymerization: 400) 6 parts by weight Polyurethane resin (Nilaporan N2301, manufactured by Nippon Polyurethane Co., Ltd.) 10 parts by weight Polyisonanate compound (manufactured by Nippon Polyurethane Co., Ltd., Coronate L) 2 parts Part Alumina
5th shift visit to Milistin
2 Direct parts n-butyl stearate 1 Direct part Methyl ethyl ketone IL) Odif
The above composition was dispersed with a sand mill, and the coating material was dried on a 14μ thick polyethylene film (7pV-). After coating so that the final coating thickness was 5 μm, it was processed on the m-plane and slit to a predetermined width to produce a magnetic tape.
比較例１
実施例ＩＦＣｙいてスルホン酸基含有塩ビー酢ビービニ
ルアルコール共直合体の配合１ｔｅＯとし。Comparative Example 1 Example IFCy was formulated with a sulfonic acid group-containing vinyl chloride vinegar vinyl alcohol copolymer at 1teO.
塩ピー酢ビービニルアルコール共重合体の配合量６直を
部を８直童部に変えたこと以外は、実施例１と同様にし
て磁気テープを作製し之。A magnetic tape was produced in the same manner as in Example 1, except that the blending amount of salt, pepper, vinegar, and vinyl alcohol copolymer was changed from 6 parts to 8 parts.
比較例２
実施例１において、スルホン酸基含有塩ビー昨ビービニ
ルアルコール共重合体の配合ｊｔ２ｄ！１１部を８直童
部に変え、塩ビー酢ピービニルアルコール共重合体の配
合量１ｏとし念ことを以外は、実施例１と同様にして磁
気テープを作製し友。Comparative Example 2 In Example 1, the blending of the sulfonic acid group-containing vinyl alcohol copolymer jt2d! A magnetic tape was prepared in the same manner as in Example 1, except that 11 parts were changed to 8 direct parts and the blending amount of vinyl chloride, vinegar, and vinyl alcohol copolymer was changed to 10.
実施例２
ａ −Ｆｅ （５ＲＥＴ＝＝５５＆／ 、！ｉ’ ）
８０重量部スルホン酸基含有塩ビー酢ビ−ビニ
ルアルコール共重合体（１１合度、１８０）
３直ｍｉ塩ビー酢ビービニルアルコール共重合体（１合
度、４００） ５＠量部ポリウレ
タン圏脂（日本ポリウレタン社製、ニラポランＮ２３０
１） １０ｇ量部ポリイソシアネート
化合物（日本ポリウレタン社製、コロネートＬ）
２直量部アルミナ
５重量部ミリスチン酸 ２直
量部ステアリン酸ｎ−ブチル １重量部メチ
ルエチルケトン １００（ｉｔ部シクロハ
キサノン １００重ｌｔｓトルエン
１００直量部上記組成物をサンド
ミルで分散後、濾過Ｍ袈し比。この塗料を厚さ１４μ悔
のポリエチレンテレフタレートフィルムとに、乾燥後の
塗膜厚が５μ情となるように塗布、乾燥後鏡面Ｉ８理を
し、こルを所定幅にスリットして磁気テープを作製し次
。Example 2 a-Fe (5RET==55&/,!i')
80 parts by weight sulfonic acid group-containing vinyl chloride, acetic acid, vinyl alcohol copolymer (11 degree, 180)
3 parts chloride, vinegar, vinyl alcohol copolymer (1 degree, 400) 5 parts Polyurethane resin (manufactured by Nippon Polyurethane Co., Ltd., Niraporan N230
1) 10g part polyisocyanate compound (manufactured by Nippon Polyurethane Co., Ltd., Coronate L)
2 parts alumina
5 parts by weight myristic acid 2 parts by weight n-butyl stearate 1 part by weight Methyl ethyl ketone 100 (it part cyclohaxanone 100 parts by weight lts toluene
After dispersing 100 direct parts of the above composition in a sand mill, it was filtered with a M filter ratio. This paint was applied to a polyethylene terephthalate film with a thickness of 14 μm so that the film thickness after drying was 5 μm. After drying, the film was polished to a mirror finish of I8, and the film was slit to a predetermined width to produce magnetic tape. Next.
比較例３
実施例２において、スルホン酸基含有塩ピー酢ビ−ビニ
ルアルコール共重合体の配合ｔｔ−ｏとし。Comparative Example 3 In Example 2, the sulfonic acid group-containing salt pea-acetate-vinyl alcohol copolymer was blended tt-o.
塩ビー酢ビービニルアルコール共重合体の配合量５重量
部を８重量部に変え几こと以外は、実施例２と同様にし
て磁気テープを作製した。A magnetic tape was produced in the same manner as in Example 2, except that the amount of the chloride, vinegar, and vinyl alcohol copolymer was changed from 5 parts by weight to 8 parts by weight.
比較例４
実施例２において、スルホン酸基含有塩ビー酢ビービニ
ルアルコール共重合体の配合量３ｉｔ部ｆｔ８直１１一
部とし、塩ビー酢ビービニルアルコール共重合体の配合
量２ｏとしたこと以外は、実施例２と同様にして磁気テ
ープを作製し之。Comparative Example 4 In Example 2, except that the blending amount of the sulfonic acid group-containing chloride, vinegar, and vinyl alcohol copolymer was 3 IT parts, ft8, and 11 parts, and the blending amount of the chloride, vinegar, and vinyl alcohol copolymer was 2O. A magnetic tape was produced in the same manner as in Example 2.
上記各実施例、比較例で得られた磁気テープの磁性粉の
分散性の指標として角型比（Ｂｒ／８ｍ）。The squareness ratio (Br/8m) is an index of the dispersibility of the magnetic powder of the magnetic tapes obtained in the above Examples and Comparative Examples.
Ｃ／Ｎ比を、磁性層の耐久性としてスチルライフを測定
した。The still life was measured using the C/N ratio as the durability of the magnetic layer.
Ｃ／Ｎ比は、酸化鉄磁性粉部用の場合は、実施例１の磁
気テープを、金属粉ｈＢ性扮便用の場合には、実施例２
の磁気テープを基準として次式で示す式を用いて算出し
た。For the C/N ratio, the magnetic tape of Example 1 was used for the iron oxide magnetic powder part, and the magnetic tape of Example 2 was used for the metal powder hB part.
It was calculated using the following formula using the magnetic tape as a reference.
上記結果から明らかなように、スルホン酸基含有塩化ビ
ニル−酢酸ビニル−ビニルアルコール共重合体を含まな
い（比較例１，３）の磁気テープは角型比、Ｃ／Ｎ比が
悪いがステルライフは良好である。一方高分子量の塩化
ビニル−酢酸ビニル−ビニルアルコール共重合体を含ま
ない（比較例２．４）の磁気テープは、角型比、Ｃ７Ｎ
比は良好だが耐久性が極めて悪い。As is clear from the above results, magnetic tapes containing no sulfonic acid group-containing vinyl chloride-vinyl acetate-vinyl alcohol copolymer (Comparative Examples 1 and 3) had poor squareness ratio and C/N ratio, but Stelllife is in good condition. On the other hand, a magnetic tape containing no high molecular weight vinyl chloride-vinyl acetate-vinyl alcohol copolymer (Comparative Example 2.4) had a squareness ratio of C7N
The ratio is good, but the durability is extremely poor.
以上説明したように、磁気記録媒体用結合剤成分として
、低分子量のスルホン酸基あるいは七の塩含有塩化ビニ
ル−酢酸ビニル−ビニルアルコール共重合体上、高分子
量の塩化ビニル−酢酸ビニル−ビニルアルコール共重合
体を併用することによって磁気記録媒体の１磁変換持注
、耐久性の向上に効果があることが明らかである。As explained above, as a binder component for magnetic recording media, a low molecular weight sulfonic acid group or heptad salt-containing vinyl chloride-vinyl acetate-vinyl alcohol copolymer, a high molecular weight vinyl chloride-vinyl acetate-vinyl alcohol copolymer, etc. It is clear that the combined use of a copolymer is effective in improving the single-magnetic conversion retention and durability of a magnetic recording medium.
１ｔｈｌ願人 日立マクセル株式会社代表者 水
井 ４1thl applicant Representative of Hitachi Maxell Co., Ltd. Wednesday
Well 4
Claims (1)
に塗着してなる磁気記録媒体において、結合剤成分に、
分子中にスルホン酸基あるいはその塩を持ち、かつ重合
度が２００以下の塩化ビニル−酢酸ビニル−ビニルアル
コール共重合体と、重合度が３５０以上の塩化ビニル−
酢酸ビニル−ビニルアルコール共重合体を含むことを特
徴とする磁気記録媒体。In a magnetic recording medium in which a magnetic layer consisting mainly of magnetic powder and a binder is coated on a flexible support, the binder component contains
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer having a sulfonic acid group or its salt in the molecule and having a degree of polymerization of 200 or less, and vinyl chloride-vinyl acetate-vinyl alcohol copolymer having a degree of polymerization of 350 or more.
A magnetic recording medium comprising a vinyl acetate-vinyl alcohol copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24050588A JPH0289215A (en) | 1988-09-26 | 1988-09-26 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24050588A JPH0289215A (en) | 1988-09-26 | 1988-09-26 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0289215A true JPH0289215A (en) | 1990-03-29 |
Family
ID=17060516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24050588A Pending JPH0289215A (en) | 1988-09-26 | 1988-09-26 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0289215A (en) |
-
1988
- 1988-09-26 JP JP24050588A patent/JPH0289215A/en active Pending
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